Science.gov

Sample records for airy st john

  1. St. John's Wort (image)

    MedlinePlus

    The herb St. John's Wort is believed to be helpful in relieving mild to moderate depression, but should only be taken under a physician's supervision. St. John's Wort may clash with other medications or foods ...

  2. St. John's Wort

    MedlinePlus

    ... 359–366. St. John's wort. Natural Medicines Comprehensive Database Web site. Accessed at www.naturaldatabase.com on February ... St. John's wort ( Hypericum perforatum L.). Natural Standard Database Web site. Accessed at www.naturalstandard.com on February ...

  3. Oliver St John Gogarty.

    PubMed

    Clarke, R W

    1997-01-01

    Oliver St John Gogarty--Otolaryngologist to fashionable Edwardian Dublin--was a distinguished poet and a Senator in the fledgling Irish Free State after its establishment in 1922. He numbered amongst his acquaintances the poet William Butler Yeats, the novelist James Joyce and a host of political and literary persona who helped to shape modern Ireland. He was satirised as 'stately plump Buck Mulligan' in Joyce's novel Ulysses. PMID:9292124

  4. St. John's Wort and Depression

    MedlinePlus

    ... feelings of anxiety in some people. What the Science Says About St. John’s Wort for Depression Study ... D., Professor Emeritus, Department of Psychiatry and Behavioral Sciences, Duke University; David Mischoulon, M.D., Ph.D., ...

  5. W. St. John Street. View looking west from intersection of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    W. St. John Street. View looking west from intersection of Pleasant and W. St. John Streets - River Street Historic District, Bounded by West Saint James Street, West Santa Clara Street, Pleasant Street, & Guadalupe River, San Jose, Santa Clara County, CA

  6. 33 CFR 110.183 - St. Johns River, Florida.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 1 2012-07-01 2012-07-01 false St. Johns River, Florida. 110.183... ANCHORAGE REGULATIONS Anchorage Grounds § 110.183 St. Johns River, Florida. (a) The anchorage grounds—(1... anchor in the St. Johns River, as depicted on NOAA chart 11491, between the entrance buoy (STJ) and...

  7. 33 CFR 110.73 - St. Johns River, Fla.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 1 2014-07-01 2014-07-01 false St. Johns River, Fla. 110.73... ANCHORAGE REGULATIONS Special Anchorage Areas § 110.73 St. Johns River, Fla. (a) Area A. The waters lying within an area bounded by a line beginning at a point located at the west bank of St. Johns River...

  8. 33 CFR 110.73 - St. Johns River, Fla.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 1 2012-07-01 2012-07-01 false St. Johns River, Fla. 110.73... ANCHORAGE REGULATIONS Special Anchorage Areas § 110.73 St. Johns River, Fla. (a) Area A. The waters lying within an area bounded by a line beginning at a point located at the west bank of St. Johns River...

  9. 33 CFR 110.183 - St. Johns River, Florida.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 1 2014-07-01 2014-07-01 false St. Johns River, Florida. 110.183... ANCHORAGE REGULATIONS Anchorage Grounds § 110.183 St. Johns River, Florida. (a) The anchorage grounds—(1... anchor in the St. Johns River, as depicted on NOAA chart 11491, between the entrance buoy (STJ) and...

  10. 33 CFR 110.73 - St. Johns River, Fla.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 1 2013-07-01 2013-07-01 false St. Johns River, Fla. 110.73... ANCHORAGE REGULATIONS Special Anchorage Areas § 110.73 St. Johns River, Fla. (a) Area A. The waters lying within an area bounded by a line beginning at a point located at the west bank of St. Johns River...

  11. 33 CFR 110.183 - St. Johns River, Florida.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 1 2013-07-01 2013-07-01 false St. Johns River, Florida. 110.183... ANCHORAGE REGULATIONS Anchorage Grounds § 110.183 St. Johns River, Florida. (a) The anchorage grounds—(1... anchor in the St. Johns River, as depicted on NOAA chart 11491, between the entrance buoy (STJ) and...

  12. Chemistry of St. John's Wort: Hypericin and Hyperforin

    ERIC Educational Resources Information Center

    Vollmer, John J.; Rosenson, Jon

    2004-01-01

    The appeal as natural antidepressant is the major selling point of St. John's Wort, which is referred to as "Prozac from the plant kingdom". Hypericin and hyperforin, two major constituents with significant biological activity of St. John's Wort and which are complex molecules with unusual features, are examined.

  13. 33 CFR 117.325 - St. Johns River.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 1 2011-07-01 2011-07-01 false St. Johns River. 117.325 Section... DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.325 St. Johns River. (a) The drawspan..., displaying flashing green lights to indicate that vessels may pass. (3) When a train approaches, large...

  14. 33 CFR 117.325 - St. Johns River.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 1 2013-07-01 2013-07-01 false St. Johns River. 117.325 Section... DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.325 St. Johns River. (a) The drawspan..., displaying flashing green lights to indicate that vessels may pass. (3) When a train approaches, large...

  15. 33 CFR 117.325 - St. Johns River.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false St. Johns River. 117.325 Section... DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.325 St. Johns River. (a) The drawspan..., displaying flashing green lights to indicate that vessels may pass. (3) When a train approaches, large...

  16. 33 CFR 117.325 - St. Johns River.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 1 2012-07-01 2012-07-01 false St. Johns River. 117.325 Section... DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.325 St. Johns River. (a) The drawspan..., displaying flashing green lights to indicate that vessels may pass. (3) When a train approaches, large...

  17. 33 CFR 117.325 - St. Johns River.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 1 2014-07-01 2014-07-01 false St. Johns River. 117.325 Section... DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.325 St. Johns River. (a) The drawspan..., displaying flashing green lights to indicate that vessels may pass. (3) When a train approaches, large...

  18. Southeast corner of W. St. John Street and N. River ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Southeast corner of W. St. John Street and N. River Streets, view from W. St. John Street - River Street Historic District, Bounded by West Saint James Street, West Santa Clara Street, Pleasant Street, & Guadalupe River, San Jose, Santa Clara County, CA

  19. St. John's Wort (Hypericum Perforatum) and Pregnancy

    MedlinePlus

    ... live chat Live Help Fact Sheets Share St. John’s Wort (Hypericum perforatum) Friday, 01 May 2015 In ... This sheet talks about whether exposure to St. John’s Wort may increase the risk for birth defects ...

  20. St. John's Wort versus Counterfeit St. John's Wort: An HPTLC Study.

    PubMed

    Frommenwiler, Débora A; Reich, Eike; Sudberg, Sidney; Sharaf, Maged H M; Bzhelyansky, Anton; Lucas, Ben

    2016-09-01

    Hypericum perforatum L. is the most commonly used herb for treating depression. Due to the popularity of this botanical, there is a potential for economically driven adulteration of St. John's wort (SJW) products. The goal of this study was to investigate SJW ingredients suspected to be adulterated based on simple preliminary HPTLC tests. Commercial samples were analyzed by HPTLC following the United States Pharmacopeia (USP) monograph methodology, with additional visualization under white light. A number of these samples presented odd methanolic solution colors and unconventional HPTLC fingerprints, suggesting the presence of other species and/or extraneous polar additives. To achieve identification and separation of the polar additives, a new reversed-phase HPTLC method was developed. The adulterants were identified as synthetic dyes in the amounts of 0.51 to 1.36% by weight. Identities of the dyes were confirmed by scanning densitometry and HPTLC-MS. A modified USP method with additional detection mode permitted the identification of eight SJW samples adulterated with dyes and six others with flavonoid fingerprints different from those specified by USP from a total of 37 samples of dry extracts, finished products, and bulk raw herb. A decision flowchart is proposed to guide the detection of adulteration of SJW in a systematic fashion. PMID:27343017

  1. St. John's Wort (Hypericum Perforatum) and Pregnancy

    MedlinePlus

    ... considerations focusing on known or potential drug-herb interactions. Arch Intern Med 158(20): 2200-2211. Moretti ME, et al. 2009 Evaluating the safety of St. John’s Wort in human pregnancy. Reprod Toxicol. 28(1):96-99. Nordeng ...

  2. 33 CFR 165.722 - Security Zone: St. Johns River, Jacksonville, Florida.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01 false Security Zone: St. Johns River....722 Security Zone: St. Johns River, Jacksonville, Florida. (a) Location. The water located within the following area is established as a security zone: beginning at the shoreline of the St. Johns River at...

  3. 33 CFR 165.722 - Security Zone: St. Johns River, Jacksonville, Florida.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Security Zone: St. Johns River....722 Security Zone: St. Johns River, Jacksonville, Florida. (a) Location. The water located within the following area is established as a security zone: beginning at the shoreline of the St. Johns River at...

  4. 33 CFR 165.722 - Security Zone: St. Johns River, Jacksonville, Florida.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01 false Security Zone: St. Johns River....722 Security Zone: St. Johns River, Jacksonville, Florida. (a) Location. The water located within the following area is established as a security zone: beginning at the shoreline of the St. Johns River at...

  5. 46 CFR 7.95 - St. Johns Point, FL to Miami Beach, FL.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 1 2014-10-01 2014-10-01 false St. Johns Point, FL to Miami Beach, FL. 7.95 Section 7... LINES Atlantic Coast § 7.95 St. Johns Point, FL to Miami Beach, FL. (a) A line drawn from the seaward extremity of St. Augustine Inlet north jetty to latitude 29°55′ N. longitude 81°15.3′ W. (St....

  6. 46 CFR 7.95 - St. Johns Point, FL to Miami Beach, FL.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 1 2013-10-01 2013-10-01 false St. Johns Point, FL to Miami Beach, FL. 7.95 Section 7... LINES Atlantic Coast § 7.95 St. Johns Point, FL to Miami Beach, FL. (a) A line drawn from the seaward extremity of St. Augustine Inlet north jetty to latitude 29°55′ N. longitude 81°15.3′ W. (St....

  7. Mania and Psychosis Associated with St. John's Wort and Ginseng.

    PubMed

    Joshi, Kaustubh G; Faubion, Matthew D

    2005-09-01

    The use of complimentary/alternative medicine has become popular as evidenced by grocery store aisles and "infomercials" devoted to herbal products. These products are often misconstrued as safe because of their natural origin. With an increase in the consumption of these products, physicians need to be aware of their potential adverse effects. There are several popular over-the-counter herbal products that can affect one's behavior, especially resulting in acute mania and/or psychosis. This article provides an overview of existing literature regarding the increased use of herbal agents, reviews several case reports describing a potential association between herbal products (St. John's Wort and ginseng) and the development of mania and psychosis, and discusses the limitations in determining the frequency of serious adverse effects due to herbal products. PMID:21120109

  8. 46 CFR 7.95 - St. Johns Point, FL to Miami Beach, FL.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 1 2012-10-01 2012-10-01 false St. Johns Point, FL to Miami Beach, FL. 7.95 Section 7.95 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES APPLICABLE TO THE PUBLIC BOUNDARY LINES Atlantic Coast § 7.95 St. Johns Point, FL to Miami Beach, FL. (a) A line drawn from the...

  9. 46 CFR 7.95 - St. Johns Point, FL to Miami Beach, FL.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 1 2011-10-01 2011-10-01 false St. Johns Point, FL to Miami Beach, FL. 7.95 Section 7.95 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES APPLICABLE TO THE PUBLIC BOUNDARY LINES Atlantic Coast § 7.95 St. Johns Point, FL to Miami Beach, FL. (a) A line drawn from the...

  10. 46 CFR 7.95 - St. Johns Point, FL to Miami Beach, FL.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 1 2010-10-01 2010-10-01 false St. Johns Point, FL to Miami Beach, FL. 7.95 Section 7.95 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES APPLICABLE TO THE PUBLIC BOUNDARY LINES Atlantic Coast § 7.95 St. Johns Point, FL to Miami Beach, FL. (a) A line drawn from the...

  11. UNDERSTANDING BIOACTIVITY AND METABOLITE DIVERSITY IN ST. JOHN'S WORT AND RELATED SPECIES

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Hypericum perforatum, commonly known as St. John's Wort, is a popular herbal supplement today in the United States taken for its reported anti-depressant and anti-viral properties. A large amount of literature on St. John's Wort has amassed over the last half-century, however this species contains a...

  12. 77 FR 419 - Drawbridge Operation Regulation; St. Johns River, Jacksonville, FL

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-05

    ... SECURITY Coast Guard 33 CFR Part 117 Drawbridge Operation Regulation; St. Johns River, Jacksonville, FL... of the Florida East Coast automated railroad bridge across the St. Johns River, mile 24.9, in... January 15, 2012 through 5 p.m. on March 29, 2012. ADDRESSES: Documents mentioned in this preamble...

  13. 78 FR 57063 - Special Local Regulations; Jacksonville Dragon Boat Festival; St. Johns River; Jacksonville, FL

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-17

    ... DHS Department of Homeland Security FR Federal Register NPRM Notice of Proposed Rulemaking A... Festival; St. Johns River; Jacksonville, FL AGENCY: Coast Guard, DHS. ACTION: Temporary final rule. SUMMARY: The Coast Guard is establishing a Special Local Regulation on the waters of the St. Johns River...

  14. St John's wort (Hypericum perforatum): drug interactions and clinical outcomes

    PubMed Central

    Henderson, L; Yue, Q Y; Bergquist, C; Gerden, B; Arlett, P

    2002-01-01

    Aims The aim of this work is to identify the medicines which interact with the herbal remedy St John's wort (SJW), and the mechanisms responsible. Methods A systematic review of all the available evidence, including worldwide published literature and spontaneous case reports provided by healthcare professionals and regulatory authorities within Europe has been undertaken. Results A number of clinically significant interactions have been identified with prescribed medicines including warfarin, phenprocoumon, cyclosporin, HIV protease inhibitors, theophylline, digoxin and oral contraceptives resulting in a decrease in concentration or effect of the medicines. These interactions are probably due to the induction of cytochrome P450 isoenzymes CYP3A4, CYP2C9, CYP1A2 and the transport protein P-glycoprotein by constituent(s) in SJW. The degree of induction is unpredictable due to factors such as the variable quality and quantity of constituent(s) in SJW preparations. In addition, possible pharmacodynamic interactions with selective serotonin re-uptake inhibitors and serotonin (5-HT1d) receptor-agonists such as triptans used to treat migraine were identified. These interactions are associated with an increased risk of adverse reactions. Conclusions In Sweden and the UK the potential risks to patients were judged to be significant and therefore information about the interactions was provided to health care professionals and patients. The product information of the licensed medicines involved has been amended to reflect these newly identified interactions and SJW preparations have been voluntarily labelled with appropriate warnings. PMID:12392581

  15. 33 CFR 165.722 - Security Zone: St. Johns River, Jacksonville, Florida.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Mulberry Cover Manatee refuge, 400 feet from Naval Air Station Jacksonville boat ramp, at 30°13′00″ N, 81... shoreline of the St. Johns River and Mulberry Cove to the point of beginning. Datum: NAD 83 (b)...

  16. 33 CFR 165.722 - Security Zone: St. Johns River, Jacksonville, Florida.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Mulberry Cover Manatee refuge, 400 feet from Naval Air Station Jacksonville boat ramp, at 30°13′00″ N, 81... shoreline of the St. Johns River and Mulberry Cove to the point of beginning. Datum: NAD 83 (b)...

  17. Altitude and generalized configuration of the top of the Floridan aquifer, St. Johns County, Florida

    USGS Publications Warehouse

    Spechler, Rick M.

    1983-01-01

    The Floridan aquifer is the principal source of freshwater to wells in most of St. Johns County. The aquifer consists of a thick sequence of interbedded limestone and dolomite of Eocene age. The top of the Floridan aquifer, which is irregular throughout St. Johns County, ranges from less than 90 feet below sea level in the extreme southestern part to more than 360 feet below sea level in the northern part. (USGS)

  18. 33 CFR 165.720 - Safety/Security Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... § 165.720 Safety/Security Zone: St. Johns River, Jacksonville, FL. (a) Location. The water and the land... zones contained in 33 CFR 165.23 and 165.33 of this part, entry into any portion of the described zone... 33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Safety/Security Zone: St....

  19. 33 CFR 165.720 - Safety/Security Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... § 165.720 Safety/Security Zone: St. Johns River, Jacksonville, FL. (a) Location. The water and the land... zones contained in 33 CFR 165.23 and 165.33 of this part, entry into any portion of the described zone... 33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01 false Safety/Security Zone: St....

  20. 33 CFR 165.720 - Safety/Security Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... § 165.720 Safety/Security Zone: St. Johns River, Jacksonville, FL. (a) Location. The water and the land... zones contained in 33 CFR 165.23 and 165.33 of this part, entry into any portion of the described zone... 33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01 false Safety/Security Zone: St....

  1. 33 CFR 165.720 - Safety/Security Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... § 165.720 Safety/Security Zone: St. Johns River, Jacksonville, FL. (a) Location. The water and the land... zones contained in 33 CFR 165.23 and 165.33 of this part, entry into any portion of the described zone... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Safety/Security Zone: St....

  2. 76 FR 39890 - St. Johns National Wildlife Refuge, FL; Draft Comprehensive Conservation Plan and Environmental...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-07

    ... process through a Federal Register notice on December 14, 2009 (74 FR 66147). Please see that notice for... occurs approximately 5 miles to the north, roughly 5 miles west of the city of Titusville, Florida. St... Fish and Wildlife Service St. Johns National Wildlife Refuge, FL; Draft Comprehensive Conservation...

  3. Inpainting using airy diffusion

    NASA Astrophysics Data System (ADS)

    Lorduy Hernandez, Sara

    2015-09-01

    One inpainting procedure based on Airy diffusion is proposed, implemented via Maple and applied to some digital images. Airy diffusion is a partial differential equation with spatial derivatives of third order in contrast with the usual diffusion with spatial derivatives of second order. Airy diffusion generates the Airy semigroup in terms of the Airy functions which can be rewritten in terms of Bessel functions. The Airy diffusion can be used to smooth an image with the corresponding noise elimination via convolution. Also the Airy diffusion can be used to erase objects from an image. We build an algorithm using the Maple package ImageTools and such algorithm is tested using some images. Our results using Airy diffusion are compared with the similar results using standard diffusion. We observe that Airy diffusion generates powerful filters for image processing which could be incorporated in the usual packages for image processing such as ImageJ and Photoshop. Also is interesting to consider the possibility to incorporate the Airy filters as applications for smartphones and smart-glasses.

  4. Document Delivery: St. John's University's Experience with Full-Text Services.

    ERIC Educational Resources Information Center

    Pessah, Roberta; Venturella, Karen

    1995-01-01

    Describes the components and procedures involved in implementing St. John's University's (New York) document delivery system, which uses University Microfilm International's PowerPackages product in conjunction with the Multi-Project for Automated Library System used by Westchester Academic Libraries Director's Organization. Evaluates the impact…

  5. St. John's wort significantly increased the systemic exposure and toxicity of methotrexate in rats

    SciTech Connect

    Yang, Shih-Ying; Juang, Shin-Hun; Tsai, Shang-Yuan; Chao, Pei-Dawn Lee; Hou, Yu-Chi

    2012-08-15

    St. John's wort (SJW, Hypericum perforatum) is one of the popular nutraceuticals for treating depression. Methotrexate (MTX) is an immunosuppressant with narrow therapeutic window. This study investigated the effect of SJW on MTX pharmacokinetics in rats. Rats were orally given MTX alone and coadministered with 300 and 150 mg/kg of SJW, and 25 mg/kg of diclofenac, respectively. Blood was withdrawn at specific time points and serum MTX concentrations were assayed by a specific monoclonal fluorescence polarization immunoassay method. The results showed that 300 mg/kg of SJW significantly increased the AUC{sub 0−t} and C{sub max} of MTX by 163% and 60%, respectively, and 150 mg/kg of SJW significantly increased the AUC{sub 0−t} of MTX by 55%. In addition, diclofenac enhanced the C{sub max} of MTX by 110%. The mortality of rats treated with SJW was higher than that of controls. In conclusion, coadministration of SJW significantly increased the systemic exposure and toxicity of MTX. The combined use of MTX with SJW would need to be with caution. -- Highlights: ► St. John's wort significantly increased the AUC{sub 0−t} and C{sub max} of methotrexate. ► Coadministration of St. John's wort increased the exposure and toxicity of methotrexate. ► The combined use of methotrexate with St. John's wort will need to be with caution.

  6. 33 CFR 165.721 - Safety Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01 false Safety Zone: St. Johns River... SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY REGULATED NAVIGATION AREAS AND LIMITED ACCESS AREAS Specific Regulated Navigation Areas and Limited Access Areas Seventh Coast Guard District § 165.721...

  7. 33 CFR 165.721 - Safety Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Safety Zone: St. Johns River... SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY REGULATED NAVIGATION AREAS AND LIMITED ACCESS AREAS Specific Regulated Navigation Areas and Limited Access Areas Seventh Coast Guard District § 165.721...

  8. 33 CFR 165.721 - Safety Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01 false Safety Zone: St. Johns River... SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY REGULATED NAVIGATION AREAS AND LIMITED ACCESS AREAS Specific Regulated Navigation Areas and Limited Access Areas Seventh Coast Guard District § 165.721...

  9. 33 CFR 165.721 - Safety Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01 false Safety Zone: St. Johns River, Jacksonville, FL. 165.721 Section 165.721 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY REGULATED NAVIGATION AREAS AND LIMITED ACCESS AREAS Specific Regulated Navigation Areas...

  10. 33 CFR 165.721 - Safety Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Safety Zone: St. Johns River... SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY REGULATED NAVIGATION AREAS AND LIMITED ACCESS AREAS Specific Regulated Navigation Areas and Limited Access Areas Seventh Coast Guard District § 165.721...

  11. Medieval Theories of Education: Hugh of St Victor and John of Salisbury

    ERIC Educational Resources Information Center

    FitzGerald, Brian D.

    2010-01-01

    This paper offers an assessment of two 12th-century theories of education, Hugh of St Victor's "Didascalicon" and John of Salisbury's "Metalogicon", maintaining that their works both draw on traditional Christian teachings and respond to contemporary pedagogical interests in systematising knowledge and integrating classical learning. The two works…

  12. Man and the Biosphere: Ground Truthing Coral Reefs for the St. John Island Biosphere Reserve.

    ERIC Educational Resources Information Center

    Brody, Michael J.; And Others

    Research on the coral species composition of St. John's reefs in the Virgin Islands was conducted through the School for Field Studies (SFS) Coral Reef Ecology course (winter 1984). A cooperative study program based on the United Nations Educational, Scientific, and Cultural Organization's (Unesco) program, Man and the Biosphere, was undertaken by…

  13. Stationary nonlinear Airy beams

    SciTech Connect

    Lotti, A.; Faccio, D.; Couairon, A.; Papazoglou, D. G.; Panagiotopoulos, P.; Tzortzakis, S.; Abdollahpour, D.

    2011-08-15

    We demonstrate the existence of an additional class of stationary accelerating Airy wave forms that exist in the presence of third-order (Kerr) nonlinearity and nonlinear losses. Numerical simulations and experiments, in agreement with the analytical model, highlight how these stationary solutions sustain the nonlinear evolution of Airy beams. The generic nature of the Airy solution allows extension of these results to other settings, and a variety of applications are suggested.

  14. Geology of the insular shelf south of St. Thomas and St. John, U.S. Virgin Islands

    USGS Publications Warehouse

    Garrison, L. E.; Holmes, Charles Ward; Trumbull, James V.

    1971-01-01

    A reconnaissance study has been made of the geology of the insular shelf south of St. Thomas and St. John, Virgin Islands. High-resolution seismic-reflection profiling reveals that a buried northeast-southwest striking bedrock ridge controls the shallow structure of the eastern portion of the shelf. This ridge is thought to be related to the Virgin Islands pluton farther north. Bedrock in the western shelf portion is more deeply buried and is thought to be a flatter terrain, probably lithologically similar to rocks exposed on St. Thomas. The sediment cover appears to consist principally of carbonate grains in the sand-size range. This sand is covered to various degrees by carbonate nodules at depths below about 34 m, but at shallower depths the nodules are not present. Three large areas of sandy bottom were mapped 1) west of Brewers Bay, 2) near Buck Island, and 3) off south-central St. John. Variations in the amounts of land-derived particles, organic matter, and silt/clay sized material were mapped in these bodies.

  15. Bucking the Trend, St. John's University Converts Instructors into Tenure-Track Professors

    ERIC Educational Resources Information Center

    June, Audrey Williams

    2009-01-01

    Scholars who teach composition, a staple on the schedule of many a college freshman, often wind up stringing together a series of adjunct teaching jobs while keeping an eye out for that first step on the golden track to tenure. This article reports on a group of 20 people hired by St. John's University to teach in its first-year writing program,…

  16. Planning applications in east central Florida. [St. Johns National Wildlife Refuge

    NASA Technical Reports Server (NTRS)

    Hannah, J. W.; Thomas, G. L.; Esparza, F. (Principal Investigator); Millard, J. J.

    1975-01-01

    The author has identified the following significant results. St. Johns National Wildlife Refuge, a 4000 acre marsh, was established primarily to protect the Dusky Seaside Sparrow. A vegetation map of the refuge based on ground observations and color infrared photography was made. The preferred habitat of this sparrow is high-to-medium density spartina (a marsh grass) with no trees nearby. An increase in spartina density corresponds to an increase in marsh wetness. A thematic map shows the birds habitat preferences.

  17. Determination of St. John's wort components in dietary supplements and functional foods by liquid chromatography.

    PubMed

    Ang, Catharina Y W; Cui, Yanyan; Chang, Hebron C; Luo, Wenhong; Heinze, Thomas M; Lin, Lawrence J; Mattia, Antonia

    2002-01-01

    St. John's wort (Hypericum perforatum L.) preparations, a top-selling botanical dietary supplement used primarily as an antidepressant, has recently been used as an ingredient in some food products sold as functional foods. A rapid extraction technique followed by a liquid chromatographic (LC) method was developed to determine 4 characteristic bioactive compounds (pseudohypericin, hypericin, hyperforin, and adhyperforin) from St. John's wort in dietary supplements and functional foods to which it was added. Solid samples, including dried leaf/flower mixture, dietary supplement capsules, tea bags, puff and snack bar, were extracted with methanol by sonication. Noncarbonated, fruit-flavored drinks were centrifuged and mixed with methanol. Compounds were then determined by isocratic, reversed-phase LC with UV detection at 2 wavelengths and further identified or confirmed by photodiode array spectra and LC/mass spectrometry. Within-laboratory method variations (% RSD) were satisfactory. Very low amounts, if any, of the 4 components were found in drink and puff samples, and none was found in the snack bar. The methods developed provide a useful means for the determination of St. John's wort components in dietary supplements and functional foods. PMID:12477200

  18. 33 CFR 334.510 - U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false U.S. Navy Fuel Depot Pier, St... REGULATIONS § 334.510 U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area. (a) The... that have been specifically authorized to do so by the Officer in Charge of the Navy Fuel Depot....

  19. 33 CFR 334.510 - U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 3 2012-07-01 2012-07-01 false U.S. Navy Fuel Depot Pier, St... REGULATIONS § 334.510 U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area. (a) The... that have been specifically authorized to do so by the Officer in Charge of the Navy Fuel Depot....

  20. 33 CFR 334.510 - U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 3 2011-07-01 2011-07-01 false U.S. Navy Fuel Depot Pier, St... REGULATIONS § 334.510 U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area. (a) The... that have been specifically authorized to do so by the Officer in Charge of the Navy Fuel Depot....

  1. Intake of St John's wort improves the glucose tolerance in healthy subjects who ingest metformin compared with metformin alone

    PubMed Central

    Stage, Tore Bjerregaard; Pedersen, Rasmus Steen; Damkier, Per; Christensen, Mette Marie Hougaard; Feddersen, Søren; Larsen, John Teilmann; Højlund, Kurt; Brøsen, Kim

    2015-01-01

    Aims Our objective was to investigate the steady-state pharmacokinetic and pharmacodynamic interaction between the antidepressive herbal medicine St John's wort and the antidiabetic drug metformin. Methods We performed an open cross-over study in 20 healthy male subjects, who received 1 g of metformin twice daily for 1 week with and without 21 days of preceding and concomitant treatment with St John's wort. The pharmacokinetics of metformin was determined, and a 2 h oral glucose tolerance test was performed. Results St John's wort decreased the renal clearance of metformin but did not affect any other metformin pharmacokinetic parameter. The addition of St John's wort decreased the area under the glucose concentration–time curve [702 (95% confidence interval, 643–761) vs. 629 min*mmol/L (95% confidence interval, 568–690), P = 0.003], and this effect was caused by a statistically significant increase in the acute insulin response. Conclusions St John's wort improves glucose tolerance by enhancing insulin secretion independently of insulin sensitivity in healthy male subjects taking metformin. PMID:25223504

  2. Early signs of recovery of Acropora palmata in St. John, US Virgin Islands

    USGS Publications Warehouse

    Muller, E.M.; Rogers, Caroline S.; van Woesik, R.

    2014-01-01

    Since the 1980s, diseases have caused significant declines in the population of the threatened Caribbean coral Acropora palmata. Yet it is largely unknown whether the population densities have recovered from these declines and whether there have been any recent shifts in size-frequency distributions toward large colonies. It is also unknown whether colony size influences the risk of disease infection, the most common stressor affecting this species. To address these unknowns, we examined A. palmata colonies at ten sites around St. John, US Virgin Islands, in 2004 and 2010. The prevalence of white-pox disease was highly variable among sites, ranging from 0 to 53 %, and this disease preferentially targeted large colonies. We found that colony density did not significantly change over the 6-year period, although six out of ten sites showed higher densities through time. The size-frequency distributions of coral colonies at all sites were positively skewed in both 2004 and 2010, however, most sites showed a temporal shift toward more large-sized colonies. This increase in large-sized colonies occurred despite the presence of white-pox disease, a severe bleaching event, and several storms. This study provides evidence of slow recovery of the A. palmata population around St. John despite the persistence of several stressors.

  3. 33 CFR 334.510 - U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 3 2014-07-01 2014-07-01 false U.S. Navy Fuel Depot Pier, St... REGULATIONS § 334.510 U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area. (a) The area is described as: (1) A line running at 238.5° true and paralleling the pier at 100 feet...

  4. 33 CFR 334.510 - U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 3 2013-07-01 2013-07-01 false U.S. Navy Fuel Depot Pier, St... REGULATIONS § 334.510 U.S. Navy Fuel Depot Pier, St. Johns River, Jacksonville, Fla.; restricted area. (a) The area is described as: (1) A line running at 238.5° true and paralleling the pier at 100 feet...

  5. Mammalian neurohormones: potential significance in reproductive physiology of St. John's wort (Hypericum perforatum L.)?

    NASA Astrophysics Data System (ADS)

    Murch, Susan; Saxena, Praveen

    2002-10-01

    Melatonin and serotonin are indoleamine neurohormones that function as photoperiod signals in many species and have recently been found in St. John's wort, a medicinal plant used in the treatment of depression. There is no known role for melatonin in higher plants but melatonin functions as a signal of changes in photoperiod in other species. In the current study, serotonin and melatonin were quantified during flower development. Higher concentrations of serotonin were found in flower buds at the tetrad stage of microspore development and higher melatonin concentrations were detected during uninucleate mircosporogenesis. Additionally, the regeneration potential of isolated anthers was highest in the same stage that had elevated melatonin concentrations. These data provide the first evidence of the presence of melatonin during flower development and raise many questions about the potential roles of serotonin and melatonin as regulatory molecules in the reproductive flexibility of higher plants.

  6. The St. Johns River, Florida: a Unique Lentic/Lotic Waterbody on the Southeastern Coastal Plain.

    NASA Astrophysics Data System (ADS)

    Dobberfuhl, D. R.

    2005-05-01

    The St. Johns River is a 500-km, low-gradient, black water river located in northeast Florida. Tidal effects, reverse flow events, and numerous saline springs result in estuarine conditions sometimes extending far upstream. Invertebrate sampling has occurred aperiodically in the lower mainstem of the river since 1974. In general, fresher areas of the river exhibited higher taxa richness but relatively little difference in diversity. The river shows differences in invertebrate populations throughout the lower estuarine section related to salinity. The watershed is facing tremendous development pressure and is subsequently challenged by typical problems, although little historical change was detected using this 30-year dataset. However, data suggested that there was evidence of localized impairment to the benthic community. Finally, areas with submerged aquatic vegetation (SAV) demonstrated higher richness and diversity than comparable bare areas, underscoring the importance of SAV to the health and productivity of the river.

  7. Soul sisters: the St. John and Raynard nurses in nineteenth century London.

    PubMed

    Williamson, L

    1996-01-01

    This paper uses the archives of the St John's training institution for nurses and the Raynard Mission to determine the extent to which cultural images and specialised space defined and drove the nursing profession in nineteenth and early twentieth century London. Emphasis is placed upon image and rhetoric, both sacred and secular, and the way the two combined to define the 'ideal' Victorian woman and nursing in the nineteenth and early twentieth centuries, and the understanding and treatment of illness. Research to date suggests that through a process of rationalisation of biblical and socio-cultural rhetoric, a specialisation of space, symbolic and literal, abstract and real was created; this enabled women to work in a gendered enclave, the organisational structure and rhetoric of which paralleled that of nunneries or convents. And even as the 'secular' became dominant in medical attitudes and treatment, the 'sacred'aspect of nursing and the emphasis placed upon it as being a vocation remained strong. PMID:11618488

  8. Weathering and soil erosion at watershed scale in St. John, US Virgin Islands.

    NASA Astrophysics Data System (ADS)

    Gudiño, Napoleón; Kretzschmar, Thomas; Gray, Sarah

    2015-04-01

    Human activities may increase soil erosion and the delivery of land-based sediment into coastal waters from steep sub-tropical islands. These changes may also affect water-rock interaction, which alters the geochemistry of storm-water and the clay mineralogy of eroded sediments. The purpose of this analysis is to compare storm-water, sediment geochemistry and modeled erosion rates between developed and undeveloped watersheds on Saint John, United States Virgin Islands (USVI). The saturation index was calculated by "The Geochemist's Workbench", supported by X-Ray diffraction on clay minerals. The Revised and Modified Universal Soil Loss Equations were used to estimate both annual mean (2010) and storm-event (Hurricane Otto) based erosion rates. Relative concentration of illite was higher in Coral Bay. Calculated RUSLE/MUSLE-based erosion rates were higher for the developed compared to the undeveloped watersheds. Results of this investigation suggest that rural/urban development of watersheds may increase the weathering, soil erosion and coastal sedimentation causing a negative effect on the marine ecosystem in St. John USVI.

  9. TESTING PHARMACEUTICAL RELEASE OF ACTIVE SUBSTANCES FROM MEDICINAL PRODUCTS CONTAINING ST. JOHN'S WORT.

    PubMed

    Sakowska, Joanna; Anyzewska, Małgorzata; Łozak, Anna; Kowalczuk, Anna; Jabłczyńska, Renata

    2016-01-01

    The aim of this study was to determine the content of hypericins and flavonoids in tablets and capsules containing the extract or powdered herb of St. John's wort, in herbs for infusion and herbal infusions and to release of these compounds from tablets and capsules. HPLC method was used to determine the assay of hypericins and flavonoids in all tested products. The hypericins content was between 0.35 mg and 1.44 mg per tablet or capsule. The release of hypericins from these products in the phosphate buffer of pH 6.8 is between 30 and 60% of the determined content. The degree of hypericins release from herbs into infusions was 15% on average, which corresponds to 0.64 mg of hypericins per infusion of 4 g of herbs. The flavonoids content was between 8.79 and 36.3 mg per tablet or capsule. The release of flavonoids in the phosphate buffer of pH 6.8 is between 63 and 85% of the determined content. The degree of flavonoids release was 76% on average, which corresponds to 77.0 mg per infusion of 4 g of herbs. The test results confirmed that infusions from the St. John's wort constitute are a rich source of flavonoids. At the same time, the universally accepted opinion that aqueous infusions contain only trace amounts of hypericins was not confirmed. Infusions from Herba hyperici may also be a source of hypericins in amounts comparable with the minimum dose recommended for the treatment of mild to moderate depressive episodes. PMID:27180432

  10. 76 FR 16447 - St. John Knits, Inc., Irvine, CA; Amended Certification Regarding Eligibility To Apply for Worker...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-23

    ... notice was published in the Federal Register on February 24, 2011 (76 FR 10397). At the request of the... Federal Register on September 3, 2008 (73 FR 51529). ] In order to avoid an overlap in worker group... Employment and Training Administration St. John Knits, Inc., Irvine, CA; Amended Certification...

  11. 76 FR 30394 - St. John Knits, Inc. Irvine, CA; Amended Certification Regarding Eligibility To Apply for Worker...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-25

    ... notice was published in the Federal Register on February 24, 2011 (76 FR 10397). At the request of the... Federal Register on September 3, 2008 (73 FR 51529). In order to avoid an overlap in worker group coverage... Employment and Training Administration St. John Knits, Inc. Irvine, CA; Amended Certification...

  12. Voigt Airy surface magneto plasmons.

    PubMed

    Hu, Bin; Wang, Qi Jie; Zhang, Ying

    2012-09-10

    We present a basic theory on Airy surface magneto plasmons (SMPs) at the interface between a dielectric layer and a metal layer (or a doped semiconductor layer) under an external static magnetic field in the Voigt configuration. It is shown that, in the paraxial approximation, the Airy SMPs can propagate along the surface without violating the nondiffracting characteristics, while the ballistic trajectory of the Airy SMPs can be tuned by the applied magnetic field. In addition, the self-deflection-tuning property of the Airy SMPs depends on the direction of the external magnetic field applied, owing to the nonreciprocal effect. PMID:23037243

  13. Measuring and Modeling Sediment Production from Unpaved Roads, St. John,U.S.Virgin Islands

    NASA Astrophysics Data System (ADS)

    Ramos-Scharron, C. E.; MacDonald, L. H.

    2001-12-01

    Previous studies have identified unpaved roads as the most important source of sediment on the island of St. John in the U.S. Virgin Islands, but were not able to evaluate the primary controlling factors or develop predictive models for planning and management. The goals of this study were to: (1) quantify the effect of different factors on sediment production from unpaved road surfaces; and (2) develop an empirical model for predicting sediment production from unpaved road segments. Sediment production rates from 22 road segments were intermittently monitored from July 1998 to May 2000, yielding a total of 83 measurements. Road segment slopes ranged from 1 to 21 percent, traffic varied from almost zero on abandoned roads to more than 250 vehicles per day, and there was considerable variability in the time since grading and the frequency of regrading. Five recording rain gauges provided rainfall amounts and erosivities for the different segments and measurement periods. Preliminary analyses show that sediment production is strongly related to both rainfall erosivity and the availability of fine particles on the road surface. Road surface erosion rates were related to the product of road drainage area and slope (Anderson and MacDonald, 1998), but this relationship is probably significant because area times slope is a surrogate for the erosive energy of road surface runoff. Road segments regraded within a year produced much more sediment than roads that had not been recently regraded, and this is probably due to the increased availability of fine particles. An empirical model was developed to predict sediment production from unpaved road segments as a function of total rainfall, road gradient or the area-slope product, and a discrete qualitative variable combining estimated road usage and time since grading. The application of this model to 22 road segments yielded road erosion rates ranging from 0.6 to 29 kg m-2 yr-1 (3.6 to 140 tons km-1 yr-1). These values are at

  14. The Sargassum Frogfish (Histrio histrio Linnaeus) observed in mangroves in St. John, US Virgin Islands

    USGS Publications Warehouse

    Rogers, C.S.; Pietsch, T.W.; Randall, J.E.; Arnold, R.J.

    2010-01-01

    The Sargassum Frogfish (Histrio histrio), the only pelagic member of the frogfish family Antennariidae, is considered an obligate associate of floating mats of the brown algae Sargassum natans and S. fluitans (Adams 1960; Dooley 1972; Pietsch and Grobecker 1987). Between February and April 2010, 20 of these fish were observed in three mangrove-fringed bays in Virgin Islands Coral Reef National Monument, St. John, US Virgin Islands. All of them were clinging to clumps of the red alga Acanthophora spicifera growing on the submerged prop roots of red mangrove trees (Rhizophora mangle) distributed along an estimated total of 2,160 mof shoreline (Fig. 1). All of the fish were at a depth of less than 0.5 meters. Two individuals were seen on one prop root, but the other 18 were solitary. Their estimated standard lengths ranged from about 20 to 100 mm. Littler and Littler (2000, p. 295) published a photograph of one individual in blades of the green alga Ulva lactuca growing on a prop root in Belize. This is the first report of the Sargassum Frogfish living in association with attached algae.

  15. Long-term variation of octocoral populations in St. John, US Virgin Islands

    NASA Astrophysics Data System (ADS)

    Lenz, Elizabeth A.; Bramanti, Lorenzo; Lasker, Howard R.; Edmunds, Peter J.

    2015-12-01

    The decline in abundance of scleractinian corals over the past three decades in the Caribbean has raised the possibility that other important benthic taxa, such as octocorals, are also changing in abundance. We used photoquadrats taken over 20 yr from reefs (7-9 m depth) at six sites on the south coast of St. John, US Virgin Islands, to test the hypothesis that octocorals have changed in abundance since 1992. Octocorals were counted in 0.25 m2 photoquadrats at 2- to 3-yr intervals and identified to genus or family. Overall, there was variation over time in population density of octocorals (pooled among taxa, and also separately for Antillogorgia spp., Gorgonia spp., and plexaurids) at each site, and densities remained unchanged or increased over 20 yr; where increases in density occurred, the effects were accentuated after 2002. The local-scale analysis was expanded to the Caribbean (including the Florida Keys) by compiling data for octocoral densities from 31 studies for reefs at ≤25 m depth between 1968 and 2013. At this scale, analyses were limited by the paucity of historical data, and despite a weak trend of higher octocoral densities in recent decades, statistically, there was no change in octocoral abundance over time. Together with data from the whole Caribbean, the present analysis suggests that octocorals have not experienced a decadal-scale decline in population density, which has occurred for many scleractinian corals.

  16. Optical water quality of a blackwater river estuary: the Lower St. Johns River, Florida, USA

    NASA Astrophysics Data System (ADS)

    Gallegos, Charles L.

    2005-04-01

    This paper reports measurements of absorption and scattering coefficients in relation to standard water quality measurements in the St. Johns River (Florida, USA), a blackwater river in which phytoplankton chlorophyll and non-algal particulates as well as colored dissolved organic matter (CDOM) contribute substantially to the inherent optical properties of the water. Extremely high concentrations of CDOM in this river present special problems for the measurement of inherent optical properties, such as the presence of very fine particulate matter that passes through most glass fiber filters. Empirical relationships are presented for estimating true dissolved absorption at very high CDOM concentrations. Specific-absorption and -scattering coefficients of suspended particulate matter varied widely, but appeared to decline steadily with salinity at salinities above 5, consistent with increasing influence of large-sized, unconsolidated mineral particulates with increasing tidal energy near the estuary mouth. Relationships are given for prediction of inherent optical properties from water quality concentrations for use in radiative transfer modeling, and changes in water quality measurements are recommended that can avoid the need for empirical corrections.

  17. Inhibitory effect of the herbal antidepressant St. John's wort (Hypericum perforatum) on rat gastric motility.

    PubMed

    Capasso, Raffaele; Borrelli, Francesca; Aviello, Gabriella; Capasso, Francesco; Izzo, Angelo A

    2008-02-01

    St. John's wort (Hypericum perforatum) is a highly popular and effective herbal antidepressant that clinically interacts with a number of conventional drugs. Because alterations in gastric emptying can cause pharmacokinetic interactions, in the present study we evaluated the effect of a standardized extract prepared from the flowering tops of Hypericum perforatum (SJW extract) on rat gastric motility. Orally administered SJW extract delayed gastric emptying in vivo. In vitro studies showed that SJW extract was significantly more active in inhibiting acetylcholine (or prostaglandin E2)-induced contractions than electrical field stimulation (EFS)-induced contractions. The effect of SJW extract on EFS-induced contractions was unaffected by drugs that inhibit intrinsic inhibitory nerves or by tachykinin antagonists, but it was reduced by the 5-hydroxytryptamine antagonist methysergide. The inhibitory effect of SJW extract on acetylcholine-induced contractions was reduced by the sarcoplasmic reticulum Ca2+-ATPase inhibitor cyclopiazonic acid, but not by the L-type Ca2+ channel blocker nifedipine or by methysergide. Among the chemical constituents of SJW extract tested, hyperforin and, to a lesser extent, the flavonoids kaempferol and quercitrin, inhibited acetylcholine-induced contractions. It is concluded that SJW has a direct inhibitory effect on smooth muscle and could also possibly modulate gastric neurotransmission. If extended to humans, the inhibitory effect of SJW extract on gastric emptying in vivo could contribute, at least in part, to the clinical pharmacokinetic interactions between conventional medicines and this herbal antidepressant. PMID:18172613

  18. The 'first' instead of the 'oldest'. St. John's Riverside, in Yonkers, N.Y., markets its history.

    PubMed

    Botvin, Judith D

    2002-01-01

    St. John's Riverside Hospital, Yonkers, N.Y., built an integrated campaign upon its long history. Using billboards, print ads, bus shelters, radio and TV it touted its 130-plus years and its long history of firsts. Its integrated campaign proclaimed these "firsts." It specifically targeted its marketing to middle to upper-middle income residents of the surrounding area, particularly females between ages 25 and 54. PMID:12238239

  19. Modeling and Analysis of Sea-level Rise Impacts on Salinity in the Lower St. Johns River

    NASA Astrophysics Data System (ADS)

    Bacopoulos, P.

    2015-12-01

    There is deliberate attention being paid to studying sea-level rise impacts on the lower St. Johns River, a drowned coastal plain-type estuary with low topographic drive, located in northeastern Florida. One area of attention is salinity in the river, which influences the entire food web, including sea and marsh grasses, juvenile crustaceans and fishes, wading birds and migratory waterfowl, marine mammals and other predator animals. It is expected that elevated ocean levels will increase the salinity of the estuarine waters, leading to deleterious effects on dependent species of the river biology. The objective of the modeling and analysis was: 1) to establish baseline conditions of salinity for the lower St. Johns River; and 2) to examine future conditions of salinity, as impacted by sea-level rise. Establishing baseline conditions entailed validation of the model for present-day salinity in the lower St. Johns River via comparison to available data. Examining future conditions entailed application of the model for sea-level rise scenarios, with comparison to the baseline conditions, for evaluation of sea-level rise impacts on salinity. While the central focus was on the physics of sea-level rise impacts on salinity, some level of salinity-biological assessment was conducted to identify sea-level rise/salinity thresholds, as related to negatively impacting different species of the river biology.

  20. Bohmian trajectories of Airy packets

    SciTech Connect

    Nassar, Antonio B.; Miret-Artés, Salvador

    2014-09-15

    The discovery of Berry and Balazs in 1979 that the free-particle Schrödinger equation allows a non-dispersive and accelerating Airy-packet solution has taken the folklore of quantum mechanics by surprise. Over the years, this intriguing class of wave packets has sparked enormous theoretical and experimental activities in related areas of optics and atom physics. Within the Bohmian mechanics framework, we present new features of Airy wave packet solutions to Schrödinger equation with time-dependent quadratic potentials. In particular, we provide some insights to the problem by calculating the corresponding Bohmian trajectories. It is shown that by using general space–time transformations, these trajectories can display a unique variety of cases depending upon the initial position of the individual particle in the Airy wave packet. Further, we report here a myriad of nontrivial Bohmian trajectories associated to the Airy wave packet. These new features are worth introducing to the subject’s theoretical folklore in light of the fact that the evolution of a quantum mechanical Airy wave packet governed by the Schrödinger equation is analogous to the propagation of a finite energy Airy beam satisfying the paraxial equation. Numerous experimental configurations of optics and atom physics have shown that the dynamics of Airy beams depends significantly on initial parameters and configurations of the experimental set-up.

  1. Bohmian trajectories of Airy packets

    NASA Astrophysics Data System (ADS)

    Nassar, Antonio B.; Miret-Artés, Salvador

    2014-09-01

    The discovery of Berry and Balazs in 1979 that the free-particle Schrödinger equation allows a non-dispersive and accelerating Airy-packet solution has taken the folklore of quantum mechanics by surprise. Over the years, this intriguing class of wave packets has sparked enormous theoretical and experimental activities in related areas of optics and atom physics. Within the Bohmian mechanics framework, we present new features of Airy wave packet solutions to Schrödinger equation with time-dependent quadratic potentials. In particular, we provide some insights to the problem by calculating the corresponding Bohmian trajectories. It is shown that by using general space-time transformations, these trajectories can display a unique variety of cases depending upon the initial position of the individual particle in the Airy wave packet. Further, we report here a myriad of nontrivial Bohmian trajectories associated to the Airy wave packet. These new features are worth introducing to the subject's theoretical folklore in light of the fact that the evolution of a quantum mechanical Airy wave packet governed by the Schrödinger equation is analogous to the propagation of a finite energy Airy beam satisfying the paraxial equation. Numerous experimental configurations of optics and atom physics have shown that the dynamics of Airy beams depends significantly on initial parameters and configurations of the experimental set-up.

  2. Airy beam optical parametric oscillator

    NASA Astrophysics Data System (ADS)

    Aadhi, A.; Chaitanya, N. Apurv; Jabir, M. V.; Vaity, Pravin; Singh, R. P.; Samanta, G. K.

    2016-05-01

    Airy beam, a non-diffracting waveform, has peculiar properties of self-healing and self-acceleration. Due to such unique properties, the Airy beam finds many applications including curved plasma wave-guiding, micro-particle manipulation, optically mediated particle clearing, long distance communication, and nonlinear frequency conversion. However, many of these applications including laser machining of curved structures, generation of curved plasma channels, guiding of electric discharges in a curved path, study of nonlinear propagation dynamics, and nonlinear interaction demand Airy beam with high power, energy, and wavelength tunability. Till date, none of the Airy beam sources have all these features in a single device. Here, we report a new class of coherent sources based on cubic phase modulation of a singly-resonant optical parametric oscillator (OPO), producing high-power, continuous-wave (cw), tunable radiation in 2-D Airy intensity profile existing over a length >2 m. Based on a MgO-doped periodically poled LiNbO3 crystal pumped at 1064 nm, the Airy beam OPO produces output power more than 8 W, and wavelength tunability across 1.51–1.97 μm. This demonstration gives new direction for the development of sources of arbitrary structured beams at any wavelength, power, and energy in all time scales (cw to femtosecond).

  3. Airy beam optical parametric oscillator.

    PubMed

    Aadhi, A; Chaitanya, N Apurv; Jabir, M V; Vaity, Pravin; Singh, R P; Samanta, G K

    2016-01-01

    Airy beam, a non-diffracting waveform, has peculiar properties of self-healing and self-acceleration. Due to such unique properties, the Airy beam finds many applications including curved plasma wave-guiding, micro-particle manipulation, optically mediated particle clearing, long distance communication, and nonlinear frequency conversion. However, many of these applications including laser machining of curved structures, generation of curved plasma channels, guiding of electric discharges in a curved path, study of nonlinear propagation dynamics, and nonlinear interaction demand Airy beam with high power, energy, and wavelength tunability. Till date, none of the Airy beam sources have all these features in a single device. Here, we report a new class of coherent sources based on cubic phase modulation of a singly-resonant optical parametric oscillator (OPO), producing high-power, continuous-wave (cw), tunable radiation in 2-D Airy intensity profile existing over a length >2 m. Based on a MgO-doped periodically poled LiNbO3 crystal pumped at 1064 nm, the Airy beam OPO produces output power more than 8 W, and wavelength tunability across 1.51-1.97 μm. This demonstration gives new direction for the development of sources of arbitrary structured beams at any wavelength, power, and energy in all time scales (cw to femtosecond). PMID:27143582

  4. Airy beam optical parametric oscillator

    PubMed Central

    Aadhi, A.; Chaitanya, N. Apurv; Jabir, M. V.; Vaity, Pravin; Singh, R. P.; Samanta, G. K.

    2016-01-01

    Airy beam, a non-diffracting waveform, has peculiar properties of self-healing and self-acceleration. Due to such unique properties, the Airy beam finds many applications including curved plasma wave-guiding, micro-particle manipulation, optically mediated particle clearing, long distance communication, and nonlinear frequency conversion. However, many of these applications including laser machining of curved structures, generation of curved plasma channels, guiding of electric discharges in a curved path, study of nonlinear propagation dynamics, and nonlinear interaction demand Airy beam with high power, energy, and wavelength tunability. Till date, none of the Airy beam sources have all these features in a single device. Here, we report a new class of coherent sources based on cubic phase modulation of a singly-resonant optical parametric oscillator (OPO), producing high-power, continuous-wave (cw), tunable radiation in 2-D Airy intensity profile existing over a length >2 m. Based on a MgO-doped periodically poled LiNbO3 crystal pumped at 1064 nm, the Airy beam OPO produces output power more than 8 W, and wavelength tunability across 1.51–1.97 μm. This demonstration gives new direction for the development of sources of arbitrary structured beams at any wavelength, power, and energy in all time scales (cw to femtosecond). PMID:27143582

  5. Clinical drugs that interact with St. John's wort and implication in drug development.

    PubMed

    Di, Yuan Ming; Li, Chun Guang; Xue, Charlie Changli; Zhou, Shu-Feng

    2008-01-01

    St. John's wort (Hypericum perforatum, SJW) is one of the most commonly used herbal antidepressants for the treatment of minor to moderate depression. A major safety concern about SJW is its ability to alter the pharmacokinetics and/or clinical response of a variety of clinically important drugs that have distinctive chemical structure, mechanism of action and metabolic pathways. This review highlights and updates the knowledge on clinical interactions of prescribed drugs with SJW and the implication in drug development. A number of clinically significant interactions of SJW have been identified with conventional drugs, including anticancer agents (imatinib and irinotecan), anti-HIV agents (e.g. indinavir, lamivudine and nevirapine), anti-inflammatory agents (e.g. ibuprofen and fexofenadine), antimicrobial agents (e.g. erythromycin and voriconazole), cardiovascular drugs (e.g. digoxin, ivabradine, warfarin, verapamil, nifedipine and talinolol), central nervous system agents (e.g. amitriptyline, buspirone, phenytoin, methadone, midazolam, alprazolam, and sertraline), hypoglycaemic agents (e.g. tolbutamide and gliclazide), immuno-modulating agents (e.g. cyclosporine and tacrolimus), oral contraceptives, proton pump inhibitor (e.g. omeprazole), respiratory system agent (e.g. theophylline), statins (e.g. atorvastatin and pravastatin). Both pharmacokinetic and pharmacodynamic components may play a role in the interactions of drugs with SJW. For pharmacokinetic changes of drugs by SJW, induction of cytochrome P450s (e.g. CYP2C9 and 3A4) and P-glycoprotein (P-gp) are considered the major mechanism. Thus, it is not a surprise that many drugs that interact with SJW are substrates of CYP3A4, CYP2C9 and P-gp. A comprehensive understanding of clinical drugs that interact with SJW has important implications in drug development. New drugs may be designed to minimize interactions with SJW; and new SJW formulations may be designed to avoid drug interactions. Further clinical and

  6. St John's Wort (Hypericum perforatum L.) photomedicine: hypericin-photodynamic therapy induces metastatic melanoma cell death.

    PubMed

    Kleemann, Britta; Loos, Benjamin; Scriba, Thomas J; Lang, Dirk; Davids, Lester M

    2014-01-01

    Hypericin, an extract from St John's Wort (Hypericum perforatum L.), is a promising photosensitizer in the context of clinical photodynamic therapy due to its excellent photosensitizing properties and tumoritropic characteristics. Hypericin-PDT induced cytotoxicity elicits tumor cell death by various mechanisms including apoptosis, necrosis and autophagy-related cell death. However, limited reports on the efficacy of this photomedicine for the treatment of melanoma have been published. Melanoma is a highly aggressive tumor due to its metastasizing potential and resistance to conventional cancer therapies. The aim of this study was to investigate the response mechanisms of melanoma cells to hypericin-PDT in an in vitro tissue culture model. Hypericin was taken up by all melanoma cells and partially co-localized to the endoplasmic reticulum, mitochondria, lysosomes and melanosomes, but not the nucleus. Light activation of hypericin induced a rapid, extensive modification of the tubular mitochondrial network into a beaded appearance, loss of structural details of the endoplasmic reticulum and concomitant loss of hypericin co-localization. Surprisingly the opposite was found for lysosomal-related organelles, suggesting that the melanoma cells may be using these intracellular organelles for hypericin-PDT resistance. In line with this speculation we found an increase in cellular granularity, suggesting an increase in pigmentation levels in response to hypericin-PDT. Pigmentation in melanoma is related to a melanocyte-specific organelle, the melanosome, which has recently been implicated in drug trapping, chemotherapy and hypericin-PDT resistance. However, hypericin-PDT was effective in killing both unpigmented (A375 and 501mel) and pigmented (UCT Mel-1) melanoma cells by specific mechanisms involving the externalization of phosphatidylserines, cell shrinkage and loss of cell membrane integrity. In addition, this treatment resulted in extrinsic (A375) and intrinsic (UCT

  7. Runoff and suspended sediment yields from an unpaved road segment, St John, US Virgin Islands

    NASA Astrophysics Data System (ADS)

    Ramos-Scharrón, Carlos E.; MacDonald, Lee H.

    2007-01-01

    Unpaved roads are believed to be the primary source of terrigenous sediments being delivered to marine ecosystems around the island of St John in the eastern Caribbean. The objectives of this study were to: (1) measure runoff and suspended sediment yields from a road segment; (2) develop and test two event-based runoff and sediment prediction models; and (3) compare the predicted sediment yields against measured values from an empirical road erosion model and from a sediment trap. The runoff models use the Green-Ampt infiltration equation to predict excess precipitation and then use either an empirically derived unit hydrograph or a kinematic wave to generate runoff hydrographs.Precipitation, runoff, and suspended sediment data were collected from a 230 m long, mostly unpaved road segment over an 8-month period. Only 3-5 mm of rainfall was sufficient to initiate runoff from the road surface. Both models simulated similar hydrographs. Model performance was poor for storms with less than 1 cm of rainfall, but improved for larger events. The largest source of error was the inability to predict initial infiltration rates.The two runoff models were coupled with empirical sediment rating curves, and the predicted sediment yields were approximately 0.11 kg per square meter of road surface per centimetre of precipitation. The sediment trap data indicated a road erosion rate of 0.27 kg m-2 cm-1. The difference in sediment production between these two methods can be attributed to the fact that the suspended sediment samples were predominantly sand and silt, whereas the sediment trap yielded mostly sand and gravel. The combination of these data sets yields a road surface erosion rate of 0.31 kg m-2 cm-1, or approximately 36 kg m-2 year-1. This is four orders of magnitude higher than the measured erosion rate from undisturbed hillslopes. The results confirm the importance of unpaved roads in altering runoff and erosion rates in a tropical setting, provide insights into the

  8. St John's Wort (Hypericum perforatum L.) Photomedicine: Hypericin-Photodynamic Therapy Induces Metastatic Melanoma Cell Death

    PubMed Central

    Kleemann, Britta; Loos, Benjamin; Scriba, Thomas J.; Lang, Dirk; Davids, Lester M.

    2014-01-01

    Hypericin, an extract from St John's Wort (Hypericum perforatum L.), is a promising photosensitizer in the context of clinical photodynamic therapy due to its excellent photosensitizing properties and tumoritropic characteristics. Hypericin-PDT induced cytotoxicity elicits tumor cell death by various mechanisms including apoptosis, necrosis and autophagy-related cell death. However, limited reports on the efficacy of this photomedicine for the treatment of melanoma have been published. Melanoma is a highly aggressive tumor due to its metastasizing potential and resistance to conventional cancer therapies. The aim of this study was to investigate the response mechanisms of melanoma cells to hypericin-PDT in an in vitro tissue culture model. Hypericin was taken up by all melanoma cells and partially co-localized to the endoplasmic reticulum, mitochondria, lysosomes and melanosomes, but not the nucleus. Light activation of hypericin induced a rapid, extensive modification of the tubular mitochondrial network into a beaded appearance, loss of structural details of the endoplasmic reticulum and concomitant loss of hypericin co-localization. Surprisingly the opposite was found for lysosomal-related organelles, suggesting that the melanoma cells may be using these intracellular organelles for hypericin-PDT resistance. In line with this speculation we found an increase in cellular granularity, suggesting an increase in pigmentation levels in response to hypericin-PDT. Pigmentation in melanoma is related to a melanocyte-specific organelle, the melanosome, which has recently been implicated in drug trapping, chemotherapy and hypericin-PDT resistance. However, hypericin-PDT was effective in killing both unpigmented (A375 and 501mel) and pigmented (UCT Mel-1) melanoma cells by specific mechanisms involving the externalization of phosphatidylserines, cell shrinkage and loss of cell membrane integrity. In addition, this treatment resulted in extrinsic (A375) and intrinsic (UCT

  9. Monitoring the coral disease, plague type II, on coral reefs in St. John, U.S. Virgin Islands.

    PubMed

    Miller, J; Rogers, C; Waara, R

    2003-06-01

    In July 1997, conspicuous white patches of necrotic tissue and bare skeleton began to appear on scleractinian corals in several bays around St. John, US Virgin Islands. Analysis of diseased coral tissue from five different species confirmed the presence of a Sphingomonas-like bacterium, the pathogen for plague type II. To date, 14 species of hard corals have been affected by plague type II around St. John. This disease was monitored at Haulover and Tektite Reefs at depths of 7-12 meters. The study site at Tektite Reef has > 50% cover by scleractinian corals with 90% of hard corals being composed of Montastraea annularis. Monthly surveys at Tektite Reef from December 1997 to May 2001 documented new incidence of disease (bare white patches of skeleton) every month with associated loss of living coral and 90.5% of all disease patches occurred on M. annularis. The frequency of disease within transects ranged from 3 to 58%, and the area of disease patches ranged from 0.25 to 9000 cm2. The average percent cover by the disease within 1 m2 ranged from 0.01% (+/- 0.04 SD) to 1.74% (+/- 9.08 SD). Photo-monitoring of 28 diseased corals of 9 species begun in September 1997 at Haulover Reef revealed no recovery of diseased portions with all necrotic tissue being overgrown rapidly by turf algae, usually within less than one month. Most coral colonies suffered partial mortality. Very limited recruitment (e.g., of Agaricia spp., Favia spp. and sponges) has been noted on the diseased areas. This coral disease has the potential to cause more loss of live coral on St. John reefs than any other stress to date because it targets the dominant reef building species, M. annularis. PMID:15264553

  10. Monitoring the coral disease, plague type II, on coral reefs in St. John, U.S. Virgin Islands

    USGS Publications Warehouse

    Miller, J.; Rogers, C.; Waara, R.

    2003-01-01

    In July 1997, conspicuous white patches of necrotic tissue and bare skeleton began to appear on scleractinian corals in several bays around St. John, US Virgin Islands. Analysis of diseased coral tissue from five different species confirmed the presence of a Sphingomonas-like bacterium, the pathogen for plague type II. To date, 14 species of hard corals have been affected by plague type II around St. John. This disease was monitored at Haulover and Tektite Reefs at depths of 7-12 meters. The study site at Tektite Reef has >50% cover by scleractinian corals with 90% of hard corals being composed of Montastraea annular is. Monthly surveys at Tektite Reef from December 1997 to May 2001 documented new incidence of disease (bare white patches of skeleton) every month with associated loss of living coral and 90.5% of all disease patches occurred on M. annularis. The frequency of disease within transects ranged from 3 to 58%, and the area of disease patches ranged from 0.25 to 9000 cm2. The average percent cover by the disease within 1 m2 ranged from 0.01% (?? 0.04 SD) to 1.74% (?? 9.08 SD). Photo-monitoring of 28 diseased corals of 9 species begun in September 1997 at Haulover Reef revealed no recovery of diseased portions with all necrotic tissue being overgrown rapidly by turf algae, usually within less than one month. Most coral colonies suffered partial mortality. Very limited recruitment (e.g., of Agaricia spp., Favia spp. and sponges) has been noted on the diseased areas. This coral disease has the potential to cause more loss of live coral on St. John reefs than any other stress to date because it targets the dominant reef building species, M. annularis.

  11. [Hypericin and hyperforin: bioactive components of St. John's Wort (Hypericum perforatum). Their isolation, analysis and study of physiological effect].

    PubMed

    Vacek, J; Klejdus, B; Kubán, V

    2007-04-01

    St. John's Wort (Hypericum perforatum L.) is commonly accepted as a medicinal plant. The data on the physiological activities of the individual substances that are produced in different organs of H. perforatum are well known at present. The highest attention is focused on the characterization and phytochemical properties of hypericin and hyperforin. These organic compounds are used as antidepressant, anticarcinogenic (photodynamic), antimicrobial and virostatic agents. The review paper surveys the present knowledge of chemical and analytical methods for their identification and quantification, physiological activity, and pharmacological and biomedical applications of hypericin and hyperforin. PMID:17619301

  12. Celery root extract as an inducer of mania induction in a patient on venlafaxine and St John's Wort.

    PubMed

    Khalid, Zaira; Osuagwu, Ferdnand C; Shah, Bilal; Roy, Nikita; Dillon, James E; Bradley, Ronald

    2016-09-01

    Celery root belongs to a group of plants classified as the umbelliferous family, which contains phytoestrogens. Phytoestrogens are structurally similar to estrogen as they share a pair of hydroxyl groups and phenolic ring, which enables them to bind to estrogen receptors directly, making them a herbal remedy for low estrogen states such as menopause. We present a case of a female patient with depression who was stabilized on venlafaxine and St John's Wort, and who developed a manic episode due to elevated serum venlafaxine levels after she started taking celery extracts for menopausal related issues. We proffer a hypothesis for this unusual occurrence. PMID:27467225

  13. Intensity-symmetric Airy beams.

    PubMed

    Vaveliuk, P; Lencina, Alberto; Rodrigo, Jose A; Martnez-Matos, Ó

    2015-03-01

    Theoretical, numerical, and experimental research on a novel family of Airy beams in rectangular coordinates having a symmetric transverse pattern of light intensity is presented. The intensity-symmetric Airy beams include both the symmetric Airy beam whose field amplitude is an even function of the transverse coordinates and the antisymmetric Airy beam whose field amplitude is an odd function of such coordinates. The theoretical foundations are based on the relationship of the symmetries of the spectral phase with the cosine and sine Fourier transforms. These beams are analyzed in a propagation range also including the region preceding the Fourier plane. These beams exhibit autofocusing, collapse, self-bending, and reversal propagation. Moreover, the intensity distribution is strongly asymmetric with respect to the Fourier plane. All these peculiar features were not reported for other classes of paraxial beams in a rectangular frame. The experimental generation of intensity-symmetric Airy beams is demonstrated supporting the theoretical predictions. Possible applications in planar waveguide writing and optical trapping are also discussed. PMID:26366655

  14. Generation of electron Airy beams.

    PubMed

    Voloch-Bloch, Noa; Lereah, Yossi; Lilach, Yigal; Gover, Avraham; Arie, Ady

    2013-02-21

    Within the framework of quantum mechanics, a unique particle wave packet exists in the form of the Airy function. Its counterintuitive properties are revealed as it propagates in time or space: the quantum probability wave packet preserves its shape despite dispersion or diffraction and propagates along a parabolic caustic trajectory, even though no force is applied. This does not contradict Newton's laws of motion, because the wave packet centroid propagates along a straight line. Nearly 30 years later, this wave packet, known as an accelerating Airy beam, was realized in the optical domain; later it was generalized to an orthogonal and complete family of beams that propagate along parabolic trajectories, as well as to beams that propagate along arbitrary convex trajectories. Here we report the experimental generation and observation of the Airy beams of free electrons. These electron Airy beams were generated by diffraction of electrons through a nanoscale hologram, which imprinted on the electrons' wavefunction a cubic phase modulation in the transverse plane. The highest-intensity lobes of the generated beams indeed followed parabolic trajectories. We directly observed a non-spreading electron wavefunction that self-heals, restoring its original shape after passing an obstacle. This holographic generation of electron Airy beams opens up new avenues for steering electronic wave packets like their photonic counterparts, because the wave packets can be imprinted with arbitrary shapes or trajectories. PMID:23426323

  15. Potentiometric Surface of the Upper Floridan Aquifer in the St. Johns River Water Management District and Vicinity, Florida, September 2007

    USGS Publications Warehouse

    Kinnaman, Sandra L.; Dixon, Joann F.

    2008-01-01

    This map depicts the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for September 2007. Potentiometric contours are based on water-level measurements collected at 554 wells during the period September 15-27, near the end of the wet season. Some contours are inferred from previous potentiometric-surface maps with larger well networks. The potentiometric surface of the carbonate Upper Floridan aquifer responds mainly to rainfall, and more locally, to ground-water withdrawals and spring flow. Potentiometric-surface highs generally correspond to topographic highs where the aquifer is recharged. Springs and areas of diffuse upward leakage naturally discharge water from the aquifer and are most prevalent along the St. Johns River. Areas of discharge are reflected by depressions in the potentiometric surface. Ground-water withdrawals locally have lowered the potentiometric surface. Ground water in the Upper Floridan aquifer generally flows from potentiometric highs to potentiometric lows in a direction perpendicular to the contours.

  16. An in vitro and hydroponic growing system for hypericin, pseudohypericin, and hyperforin production of St. John's wort (Hypericum perforatum CV new stem).

    PubMed

    Murch, Susan J; Rupasinghe, H P Vasantha; Saxena, Praveen K

    2002-12-01

    While the interest in medicinal plants continues to grow, there is a lack of basic information with respect to efficient protocols for plant production. Recently, in vitro regeneration protocols have been developed to provide masses of sterile, consistent St. John's wort. The current study assessed the potential for acclimatization of in vitro grown St. John's wort plantlets to a nutrient film technique (NFT) hydroponic system in a controlled environment greenhouse. Quantitative analyses of hypericin, hyperforin and pseudohypericin in flower tissues were used as the parameters to assess the quality of the greenhouse-grown plants. The three bioactive compounds were found to be present in similar or higher amounts than previously reported values for field-grown plants. These data provide evidence that greenhouse hydroponic systems can be effectively used for the efficient production of St. John's wort and other medicinal plants. PMID:12494339

  17. The hermit crab Calcinus tibicen lives commensally on Millepora spp. in St. John, United States Virgin Islands

    NASA Astrophysics Data System (ADS)

    Brown, D.; Edmunds, P. J.

    2013-03-01

    The present work describes an association between the hermit crab Calcinus tibicen and milleporine hydrocorals on shallow reefs (<6-m depth) in St. John, US Virgin Islands. In one bay, most colonies of Millepora spp. were occupied by C. tibicen in 2010 (62 %) and 2011 (50 %). In 2011, the association was common along 23 km of the coast of St. John, as well as at several locations around St. Thomas. On average, a colony of Millepora spp. harbored 4 C. tibicen within its branches, but more crabs were found on bigger colonies. During the day, large numbers of C. tibicen were found on Millepora spp., and these crabs frequently (>88 % of trials) returned to the same colony of Millepora spp. when removed and placed on adjacent surfaces. Of the C. tibicen found on Millepora spp. during the day, 48 % left their colonies at night, but most subsequently returned to the same colony as shown by the high site fidelity of tagged crabs (51 % over 5 days). A Y-maze experiment conducted in the laboratory suggested that C. tibicen could detect (and move toward) Millepora spp. on a spatial scale of about 30 cm and under a flow speed of about 5 cm s-1. When tethered on algal turf or sand, 45 % of C. tibicen disappeared over 7 days and presumably were eaten, whereas 15 % disappeared when tethered on Millepora spp. These results demonstrate that the association between C. tibicen and Millepora spp. is temporally stable and widespread, and suggest that hermit crabs seek Millepora spp. to secure a daytime refuge from predators. In the absence of negative fitness consequences for Millepora spp., but demonstrable benefits to C. tibicen, we propose that the Calcinus- Millepora association is commensal.

  18. Solitons shedding from Airy beams and bound states of breathing Airy solitons in nonlocal nonlinear media

    PubMed Central

    Shen, Ming; Gao, Jinsong; Ge, Lijuan

    2015-01-01

    We investigate the spatially optical solitons shedding from Airy beams and anomalous interactions of Airy beams in nonlocal nonlinear media by means of direct numerical simulations. Numerical results show that nonlocality has profound effects on the propagation dynamics of the solitons shedding from the Airy beam. It is also shown that the strong nonlocality can support periodic intensity distribution of Airy beams with opposite bending directions. Nonlocality also provides a long-range attractive force between Airy beams, leading to the formation of stable bound states of both in-phase and out-of-phase breathing Airy solitons which always repel in local media. PMID:25900878

  19. A Climatology and Synoptic-Dynamic Basis for Distinguishing Cool-Season Precipitation Events at St. John's, Newfoundland

    NASA Astrophysics Data System (ADS)

    Milrad, Shawn M.

    For St. John's, Newfoundland, at the confluence of several North American storm tracks, we identify synoptic-scale characteristics and precursors of various classes of cool-season precipitation events. Such events, based upon a climatology for 1979-2005, are separated into three categories based on precipitation amount. We find that the storm systems responsible for extreme precipitation events originate farther south and east than corresponding features in moderate and light events. A wind climatology shows that extreme precipitation events at St. John's are characterized almost exclusively by easterly surface and 925 hPa geostrophic winds, and that both the surface and 925 hPa geostrophic winds rotate clockwise with decreasing precipitation amount. Focusing on extreme events, we utilize two methods of manual synoptic typing to further partition events. The first method uses backward air parcel trajectories to separate events by air parcel source region. One subset of events ("west") is characterized by strong upper-level dynamics and high precipitable water values in the central United States, which helps to produce a strong cyclone upon reaching the Atlantic Ocean; this is not seen for "west" events outside the extreme category. The second method of synoptic typing utilizes time series of three ascent-forcing quasi-geostrophic (QG) variables. While most events are characterized by a strong upstream sea-level cyclone originating from the Gulf of Mexico ("cyclone"), a subset are dominated by strong low-level frontogenesis, in the absence of a substantial upstream cyclone ("frontal"). Finally, a dynamic and thermodynamic analysis, and forecast model evaluation is completed for consecutive extreme events in December 2008, which produced over 125 mm of precipitation over six days. The first event is a "cyclone", and is marked by strong QG forcing for ascent in the presence of low static stability and high values of subtropical moisture. The second event is a "frontal

  20. Potentiometric surface of the upper Floridan Aquifer in the St. Johns Water Management District and vicinity, Florida, May 1984

    USGS Publications Warehouse

    Schiner, George R.; Hayes, Eugene C.

    1984-01-01

    This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for May 1984. The Upper Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area a 40-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 126 feet above sea level in Polk County to 84 feet below sea level in Nassau County. Water levels in key wells were mostly above, or less frequently, slightly below averages for May in response to diverse area rainfall patterns. Most levels in the district were about the same, or more commonly, 1 to 2 feet lower than May 1983 levels. (USGS)

  1. Investigating electron precipitation events using near-conjugate observations from St Johns, New Foundland, and Halley, Antarctica.

    NASA Astrophysics Data System (ADS)

    Hardman, Rachael; Clilverd, Mark; Rodger, Craig; Lichtenberger, Janos; Danskin, Donald

    2014-05-01

    In this study we use a narrow-band radio receiver recently installed at St Johns, New Foundland, Canada, as part of the AARDDVARK network. The aerial is located close to the site of the first successful trans-Atlantic subionospheric wireless radio signal reception made by Marconi in 1901. The AARDDVARK receiver can detect near-by perturbations in subionospheric radio wave propagation conditions caused by enhanced ionization in the altitude range 50-90 km. We present the results of an investigation of electron precipitation events during 2012 and 2013 using near-conjugate observations with Halley, Antarctica. Using the signal received from the LF transmitter located in Iceland (id: NRK, 37.5kHz) we detect changes in amplitude caused by electron precipitation events that can be linked to observations made at Halley via widebeam riometer absorption, or VLF wave occurrence, or the presence of electron magnetic ion-cyclotron (EMIC) waves.

  2. Potentiometric surface of the Floridan Aquifer, St. Johns River Water Management District and vicinity, Florida, May 1981

    USGS Publications Warehouse

    Schiner, George R.; Hayes, Eugene C.

    1981-01-01

    This map presents the potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity for May 1981. The Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made in approximately 1,000 wells and at several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area 20 and 40-foot intervals are used to show a deep cone of depression. The potentiometric surface ranged from 122 feet above NGVD (National Geodetic Vertical Datum of 1929) in Polk County to 125 feet below NGVD in Nassau County. Water levels were at record lows in many counties due to lack of rainfall. Declines were as much as 10 feet and commonly 5 feet from the May 1980 levels. (USGS)

  3. Bleaching increases likelihood of disease on Acropora palmata (Lamarck) in Hawksnest Bay, St John, US Virgin Islands

    USGS Publications Warehouse

    Muller, E.M.; Rogers, C.S.; Spitzack, Anthony S.; van Woesik, R.

    2008-01-01

    Anomalously high water temperatures may enhance the likelihood of coral disease outbreaks by increasing the abundance or virulence of pathogens, or by increasing host susceptibility. This study tested the compromised-host hypothesis, and documented the relationship between disease and temperature, through monthly monitoring of Acropora palmata colonies from May 2004 to December 2006, in Hawksnest Bay, St John, US Virgin Islands (USVI). Disease prevalence and the rate of change in prevalence showed a positive linear relationship with water temperature and rate of change in water temperature, respectively, but only in 2005 during prolonged periods of elevated temperature. Both bleached and unbleached colonies showed a positive relationship between disease prevalence and temperature in 2005, but the average area of disease-associated mortality increased only for bleached corals, indicating host susceptibility, rather than temperature per se, influenced disease severity on A. palmata. ?? 2007 Springer-Verlag.

  4. Bleaching increases likelihood of disease on Acropora palmata (Lamarck) in Hawksnest Bay, St John, US Virgin Islands

    USGS Publications Warehouse

    Muller, E.M.; Rogers, Caroline S.; Spitzack, Anthony S.; van Woesik, R.

    2007-01-01

    Anomalously high water temperatures may enhance the likelihood of coral disease outbreaks by increasing the abundance or virulence of pathogens, or by increasing host susceptibility. This study tested the compromised-host hypothesis, and documented the relationship between disease and temperature, through monthly monitoring of Acropora palmata colonies from May 2004 to December 2006, in Hawksnest Bay, St John, US Virgin Islands (USVI). Disease prevalence and the rate of change in prevalence showed a positive linear relationship with water temperature and rate of change in water temperature, respectively, but only in 2005 during prolonged periods of elevated temperature. Both bleached and unbleached colonies showed a positive relationship between disease prevalence and temperature in 2005, but the average area of disease-associated mortality increased only for bleached corals, indicating host susceptibility, rather than temperature per se, influenced disease severity on A. palmata.

  5. Bioactive xanthones from the roots of Hypericum perforatum (common St John's Wort)

    Technology Transfer Automated Retrieval System (TEKTRAN)

    In contemporary western alternative medicine, extracts of the inflorescences and upper stem leaves of Hypericum perforatum L. (common St. John’s Wort; Clusiaceae) are taken orally for the treatment of mild to moderate depression and applied topically to promote wound-healing. Numerous researchers h...

  6. Estimated discharge and chemical-constituent loading from the upper Floridan aquifer to the lower St John's River, northeastern Florida, 1990-91

    USGS Publications Warehouse

    Spechler, R.M.

    1995-01-01

    The lower St. Johns River, a 101-mile long segment of the St. Johns River, begins at the confluence of the Ocklawaha River and ends where the river discharges into the Atlantic Ocean at Mayport. The St. Johns River is affected by tides as far upstream as Lake George, 106 miles from the mouth. Saltwater from the ocean advances inland during each incoming tide and recedes during each outgoing tide. The chemical quality of the lower St. Johns River is highly variable primarily because of the inflow of saltwater from the ocean, and in some areas, from the discharge of mineralized ground water. Three hydrogeologic units are present in the study area: the surficial aquifer system, the intermediate confining unit, and the Floridan aquifer system. The surficial aquifer system overlies the intermediate confining unit and consists of deposits containing sand, clay, shell, and some limestone and dolomite. The intermediate confining unit underlies all of the study area and retards the vertical movement of water between the surficial aquifer system and the Floridan aquifer system. The intermediate confining unit consists of beds of relatively low permeability sediments that vary in thickness and areal extent and can be breached by sinkholes, fractures, and other openings. The Floridan aquifer system primarily consists of limestone and dolomite. The quality of water in the Upper Floridan aquifer varies throughout the study area. Dissolved solids in water range from about 100 to more than 5,000 milligrams per liter. Chloride and sulfate concentrations in water from the Upper Floridan aquifer range from about 4 to 3,700 milligrams per liter and from 1 to 1,300 milligrams per liter, respectively. The rate of leakage through the intermediate confining unit is controlled by the leakance coefficient of the intermediate confining unit and by the head difference between the Upper Floridan aquifer and the surficial aquifer system. The total ground-water discharge from the Upper Floridan

  7. Potential effects of deepening the St. Johns River navigation channel on saltwater intrusion in the surficial aquifer system, Jacksonville, Florida

    USGS Publications Warehouse

    Bellino, Jason C.; Spechler, Rick M.

    2013-01-01

    The U.S. Army Corps of Engineers (USACE) has proposed dredging a 13-mile reach of the St. Johns River navigation channel in Jacksonville, Florida, deepening it to depths between 50 and 54 feet below North American Vertical Datum of 1988. The dredging operation will remove about 10 feet of sediments from the surficial aquifer system, including limestone in some locations. The limestone unit, which is in the lowermost part of the surficial aquifer system, supplies water to domestic wells in the Jacksonville area. Because of density-driven hydrodynamics of the St. Johns River, saline water from the Atlantic Ocean travels upstream as a saltwater “wedge” along the bottom of the channel, where the limestone is most likely to be exposed by the proposed dredging. A study was conducted to determine the potential effects of navigation channel deepening in the St. Johns River on salinity in the adjacent surficial aquifer system. Simulations were performed with each of four cross-sectional, variable-density groundwater-flow models, developed using SEAWAT, to simulate hypothetical changes in salinity in the surficial aquifer system as a result of dredging. The cross-sectional models were designed to incorporate a range of hydrogeologic conceptualizations to estimate the effect of uncertainty in hydrogeologic properties. The cross-sectional models developed in this study do not necessarily simulate actual projected conditions; instead, the models were used to examine the potential effects of deepening the navigation channel on saltwater intrusion in the surficial aquifer system under a range of plausible hypothetical conditions. Simulated results for modeled conditions indicate that dredging will have little to no effect on salinity variations in areas upstream of currently proposed dredging activities. Results also indicate little to no effect in any part of the surficial aquifer system along the cross section near River Mile 11 or in the water-table unit along the cross

  8. Acoustic non-diffracting Airy beam

    SciTech Connect

    Lin, Zhou; Guo, Xiasheng Tu, Juan; Ma, Qingyu; Wu, Junru; Zhang, Dong

    2015-03-14

    The acoustic non-diffracting Airy beam as its optical counterpart has unique features of self-bending and self-healing. The complexity of most current designs handicaps its applications. A simple design of an acoustic source capable of generating multi-frequency and broad-band acoustic Airy beam has been theoretically demonstrated by numerical simulations. In the design, a piston transducer is corrugated to induce spatial phase variation for transducing the Airy function. The piston's surface is grooved in a pattern that the width of each groove corresponds to the half wavelength of Airy function. The resulted frequency characteristics and its dependence on the size of the piston source are also discussed. This simple design may promote the wide applications of acoustic Airy beam particularly in the field of medical ultrasound.

  9. Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1984

    USGS Publications Warehouse

    Schiner, George R.; Hayes, Eugene C.

    1984-01-01

    This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for September 1984. The Upper Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area of Nassau County a 40-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 130 feet above sea level in Polk County to 83 feet below sea level in Nassau County. Water levels in key wells ranged from slightly above average to several feet below average for September in response to diverse area rainfall patterns. Most levels in the district were about the same as the levels of September 1983. However, in Nassau County levels were generally below those of September 1983, and levels in Volusia County were mostly higher than September 1983 levels. (USGS)

  10. Effect of St. John's Wort (Hypericum perforatum) on obesity, lipid metabolism and uterine epithelial proliferation in ovariectomized rats

    PubMed Central

    You, Mi-Kyoung; Rhuy, Jin; Jeong, Kyu Shik; Bang, Mi-Ae; Kim, Myung-Seok

    2014-01-01

    BACKGROUND/OBJECTIVES This study was conducted to assess the potential of St. John's Wort (Hypericum perforatum) to prevent obesity and abnormalities in lipid metabolism induced by ovariectomy in a rat model without stimulatory activity on uterus. MATERIALS/METHODS Ovariectomized (OVX) rats were treated for 6 weeks with 70% ethanol extracts of Hypericum perforatum [HPEs: whole plant (WHPE) and flower and leaves (FLHPE)], β-estradiol-3-benzoate at a dose of 50 µg/kg/day (E2) or vehicle (distilled water). RESULTS As expected, OVX increased body weight gain and adiposity and showed higher food efficacy ratio. OVX also increased the serum cholesterol as well as insulin resistance, while reducing uterus weight and uterine epithelial proliferation rate. HPEs (WHPE and FLHPE) showed estrogen-like effect on body weight gain, adipose tissue weight and food efficacy ratio in OVX rats. HPEs prevented hypercholesterolemia induced by OVX more effectively than E2. E2 increased uterus weight and epithelial proliferation rate in OVX rats, while HPEs maintained them at the level of the sham-operated animals. CONCLUSIONS Our finding demonstrates that HPEs can be considered as an effective agent to prevent OVX-induced obesity without stimulatory activity on uterus. PMID:24944774

  11. Availability of water in the Floridan aquifer in southern Duval and northern Clay and St Johns counties, Florida

    USGS Publications Warehouse

    Fairchild, R.W.

    1976-01-01

    The Floridan aquifer within the area of investigation consists of 1,100 to 1,800 feet of soft, porous limestone interbedded with hard, dense limestone and dolomite overlain by several hundred feet of confining beds. From late 1948 to May 1972, water levels in wells tapping the Floridan aquifer declined as much as 14 feet in northern Clay and St. Johns Counties and more than 20 feet at Jacksonville in Duval County, Florida. These trends will probably continue as withdrawals from the aquifer increase. Water-level depressions exist at Green Cove Springs and Jacksonville because of natural discharge and large scale withdrawals. Withdrawals from wells could result in well interference unless the wells are spaced at least 1,000 ft apart. Two- to four-inch diameter wells drilled 100 ft or less into the aquifer yield 50 to 250 gal/min. Larger and deeper wells yield 1,000 gal/min or more. Hardness of water is generally less than 10 mg/liter. Quality of water from wells sampled over a span of 10 to 30 years has not changed noticeably. Principal recharge to the Floridan occurs southwest of the area in a lake region where rainfall percolates directly into the aquifer. (Woodard-USGS)

  12. Propagation of subtidal sea level oscillations in the river channel: A case study of the St. Johns River, Florida, USA.

    NASA Astrophysics Data System (ADS)

    Yankovsky, Alexander E.; Iyer, Suneil K.

    2015-05-01

    Analysis of water level and river discharge time series collected at three locations in the St. Johns River, FL reveals that subtidal variability with periods of several days is associated with long waves propagating from the ocean into the river channel. These dynamics are similar to tidal wave propagation: both tidal and subtidal frequency bands have the same ratio of free surface-to-discharge standard deviations, which is not the case on oceanic shelves. However, important differences also emerge: as waves pass through the river mouth, tidal oscillations exhibit much stronger attenuation, while subtidal oscillations propagate at a lower speed. Further upstream, where the channel cross-sectional area contracts (between Palatka and Buffalo Bluff), the waves in two frequency bands adjust differently: tidal waves are amplified and continue upstream, while a significant fraction of subtidal energy is reflected. The amplification of tidal waves occurs mostly through the generation of overtides. Also, tidal wave attenuation in the river relative to the mouth is nearly constant over the observation period, while the attenuation of subtidal waves exhibits strong changes. Variations in subtidal attenuation are linked to the influence of the river discharge: higher discharge (relative to the subtidal water level variability) causes stronger attenuation of subtidal waves.

  13. Chloride and total hardness concentrations of water from the upper part of the Floridan Aquifer in St. Johns County, Florida

    USGS Publications Warehouse

    Hampson, Paul S.; Hayes, Eugene C.

    1982-01-01

    Data collected from 1976 to 1979 indicate large water-quality variations in the upper 300 feet of the Floridan aquifer in St. Johns County, Florida. Chloride concentrations range from less than 10 milligrams per liter in the northwestern part of the county to more than 1,000 milligrams per liter in the southeast and extreme southwest. Total hardness concentrations range from 110 milligrams per liter in the northwest to 1,700 milligrams per liter in the southeast. In most of the county, high chloride and total hardness concentrations indicate the presence of saline water that entered the aquifer during the Pleistocene Epoch and has not been flushed out. Water quality in the aquifer has also been influenced by submarine discharge in the southeast and by heavy pumpage for irrigation in the southwest. High total hardness concentrations not accompanied by high chloride values in the western part of the county may be structurally controlled or may indicate the presence of gypsum evaporite beds in the upper 300 feet of the aquifer. (USGS)

  14. Limnology of Taylor Creek impoundment : with reference to other bodies in Upper St Johns River Basin, Florida

    USGS Publications Warehouse

    Goolsby, D.A.; McPherson, Benjamin F.

    1978-01-01

    Taylor Creek Impoundment, on the western part of the upper St. Johns basin, Fla., provides flood control and flow regulation. The 4,000-acre impoundment was first filled in 1969. The water was of relatively poor quality during the first three years of its existence, 1970-72. The impoundment is deep enough for thermal stratification, and a thermocline usually develops at 8 to 10 feet. During 1970-72 the hypolimnion remained anaerobic for more than six months. The poor water quality is attributed to the decomposition of flooded vegetation, of soil organic matter, and to heavy growths of phytoplankton and duckweed stimulated by an abundant supply of nutrients. Since 1972, the quality of the water has improved because of flushing of the impoundment and depletion of leachable nutrients and soil organic matter. The water is now similar in quality to that of nearby Wolf and Jane Green Creeks. Large releases of water may produce velocities great enough to resuspend bottom sediments several miles downstream where Taylor Creek flows into Lake Poinsett. (Woodard-USGS)

  15. St. John's Wort (Hypericum perforatum) stimulates human osteoblastic MG-63 cell proliferation and attenuates trabecular bone loss induced by ovariectomy

    PubMed Central

    You, Mi-kyoung; Kim, Du-Woon; Jeong, Kyu-Shik; Bang, Mi-Ae; Kim, Hwan-Seon; Rhuy, Jin

    2015-01-01

    BACKGROUND/OBJECFTIVES The effect of St. John's Wort extract (SJW) on MG-63 cell proliferation and trabecular bone loss induced by ovariectomy was examined. MATERIALS/METHODS Proliferation, expression of estrogen receptor (ER) α and ER β, and gene expressions of osteoprotegerin (OPG), osteocalcin (OC) and alkaline phosphatase (ALP) were examined in MG-63 cells treated with or without SJW. Ovariectomized rats were treated with SJW at the dose of 100 or 200 mg/kg/day, β-estradiol-3-benzoate (E2), or vehicle only (OVX-C), and sham operated rats were treated with vehicle only (Sham-C). Serum ALP and C-telopeptide (CTX), and femoral trabecular bone loss were examined. RESULTS SJW increased MG-63 cell proliferation and expression of ER α and ER β, and positive effect was shown on gene expressions of ALP, OC and OPG. SJW also showed estrogen like effect on bone associated with slowing down in trabecular bone loss. Histopathology by H&E showed rats treated with SJW displayed denser structure in metaphyseal region of distal femur compared with rats in OVX-C. SJW was shown to reduce serum CTX in OVX rats. CONCLUSION The present study provides new insight in preventing estrogen deficiency induced bone loss of SJW and possibility for its application in bone health supplement. PMID:26425274

  16. Elemental fingerprinting of Hypericum perforatum (St John's Wort) herb and preparations using ICP-OES and chemometrics.

    PubMed

    Owen, Jade D; Kirton, Stewart B; Evans, Sara J; Stair, Jacqueline L

    2016-06-01

    St. John's wort (SJW) (Hypericum perforatum) is a herbal remedy commonly used to treat mild depression. The elemental profiles of 54 samples (i.e., dry herbs, tablets and capsules) were evaluated by monitoring 25 elements using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The major elemental constituents in the SJW samples were Ca (300-199,000μg/g), Mg (410-3,530μg/g), Al (4.4-900μg/g), Fe (1.154-760μg/g), Mn (2.4-261μg/g), Sr (0.88-83.6μg/g), and Zn (7-64μg/g). For the sixteen elements that could be reliably quantified, principal component analysis (PCA) was used to investigate underlying patterns in the data. PCA models identified 7 key elements (i.e., Ba, Ca, Cd, Mg, Mo, Ni and Y), which described 85% of the variance in the dataset in the first three principal components. The PCA approach resulted in a general delineation between the three different formulations and provides a basis for monitoring product quality in this manner. PMID:26994552

  17. Relationships Between Litter Processing and Impervious Surface Cover in Headwater Tributaries of the St. Johns River, Florida

    NASA Astrophysics Data System (ADS)

    Chadwick, M. A.; Dobberfuhl, D. R.; Benke, A. C.; Huryn, A. D.; Suberkropp, K.; Thiele, J. E.

    2005-05-01

    We investigated relationships between land-use and litter processing in 18 tributaries of the St. Johns River, Florida. The percent total impervious area (PTIA) of these catchments ranged from 0-66%. We measured mass loss and fungal biomass (as ergosterol) and associated macroinvertebrate biomass for 2 litter species (red maple [Acer rubrum] and sweetgum [Liquidambar styraciflua]). Processing rates ranged from 0.010-0.046d-1 for maple and 0.006-0.018d-1 for sweetgum. The fastest processing occurred at intermediate PTIA. Fungal biomass peaked at 24 days with the lowest biomass occurring in the low PTIA stream. Rates of processing were positively related to both mean macroinvertebrate biomass and taxa richness. Shredder biomass was not related to maple, but was negatively related to sweetgum processing. Scraper biomass peaked at intermediate PTIA, and was positively related to processing rates for both leaf species. We reduced correlated physicochemical, land-use and biological variables to several orthogonal variables using principle components analysis. Regression models based on these variables accounted for 70% of the variance in processing rates for both leaf species. Collectively, these results demonstrate that PTIA and other land-use indicators are associated with differences in stream ecosystem patterns and processes between low gradient, subtropical streams.

  18. A survey of environmental pollutants and cellular-stress markers of Porites astreoides at six sites in St. John, U.S. Virgin Islands.

    PubMed

    Downs, Craig A; Woodley, Cheryl M; Fauth, John E; Knutson, Sean; Burtscher, Martina Maria; May, Lisa A; Avadanei, Athena R; Higgins, Julie L; Ostrander, Gary K

    2011-11-01

    Coral communities along the coast of St. John, U.S. Virgin Islands have exhibited site-specific behavior in declines. In order to determine if these specific coral communities are stressed and whether a pollutant or environmental factor present at this site is a probable stressor, we surveyed six near-shore coral communities in St. John, USVI for environmental pollutants and to determine the cellular physiological condition of the coral, Porites astreoides. The six sites within St. John are Cruz Bay, Caneel Bay, Hawksnest Bay, Trunk Bay, Tektite Reef in Beehive Bay, and Red Point. Red Point was considered the reference site because of its abundance and diversity of species, and it was the furthest removed from down-stream and down-current anthropogenic activities. All sites showed distinct cellular-stress marker patterns, indicating that the physiological condition of each population was different. Populations at Cruz, Hawksnest, Trunk, and Tektite were stressed, as indicated by high levels of DNA lesions and expression of stress proteins. Hawksnest and Tektite were contaminated with polyaromatic hydrocarbons (PAHs), while Cruz was contaminated with semi-volatile organochlorines and nitrogen-based biocides. At least for Hawksnest and Tektite, stress-marker patterns were consistent with an exposure to PAHs. Fecal coliform levels were high in Cruz and Trunk, indicating fecal contamination, as well as consideration for management action. Results from this study serve as a justification for a more thorough and methodical investigation into the stressors responsible for declines of coral populations within St. John. Furthermore, this study supports the argument for the importance of local factors contributing to regional coral reef declines; that not all forces impacting coral are global. PMID:21735126

  19. Hydrology, Water Quality, and Aquatic Communities of Selected Springs in the St. Johns River Water Management District, Florida

    USGS Publications Warehouse

    Walsh, Stephen J.; Knowles, Leel, Jr.; Katz, Brian G.; Strom, Douglas G.

    2009-01-01

    Hydrologic, physicochemical, and aquatic community data were collected and compiled by the U.S. Geological Survey for selected springs within the St. Johns River Water Management District from January 2004 to October 2007. Nine springs were included in this study: Alexander, Apopka, Bugg, De Leon, Gemini, Green, Rock, Silver Glen, and Wekiwa. Urban lands increased in Alexander, Apopka, De Leon, Gemini, Green, and Wekiwa springsheds between 1973 and 2004, accompanied by a loss of forested and/or agricultural lands in most springsheds. Forested cover increased and open surface waters and wetlands decreased in the Bugg and Rock springsheds. Although rainfall did not change significantly over time in each springshed, spring discharge decreased significantly in De Leon, Fern Hammock, Rock, Silver, and Wekiwa Springs. Nitrate concentrations increased significantly with time in Apopka, Fern Hammock, Gemini Springs run, and Juniper Springs, and decreased significantly in Alexander Spring, Bugg Spring run, Rock Springs, and Wekiwa Springs. Phosphorus increased significantly with time in Juniper Springs and decreased significantly in Apopka, De Leon, Rock, Silver Glen, and Wekiwa Springs. Benthic macroinvertebrate communities ranged from relatively low diversity assemblages (Green Spring) to assemblages with high taxonomic richness, diversity, and dominance (Rock and De Leon Springs). Shannon-Wiener diversity index averages among samples pooled by spring were lowest for Apopka Spring and greatest for Rock, Bugg, and Silver Glen Springs. Mean Stream Condition Index for pooled samples per spring was lowest for De Leon and Gemini Springs and highest for Rock and Wekiwa Springs. Mean percentages of very tolerant taxa were lowest for Alexander Spring and highest for Bugg and Green Springs. Fish community richness was lowest for Green Spring, and greatest for Alexander Spring run and Silver Glen Springs. Forty five fish species representing 35 genera and 23 families were collected

  20. Bleaching, disease and recovery in the threatened scleractinian coral Acropora palmata in St. John, US Virgin Islands: 2003-2010

    NASA Astrophysics Data System (ADS)

    Rogers, C. S.; Muller, E. M.

    2012-09-01

    A long-term study of the scleractinian coral Acropora palmata in the US Virgin Islands (USVI) showed that diseases, particularly white pox, are limiting the recovery of this threatened species. Colonies of A. palmata in Haulover Bay, within Virgin Islands National Park, St. John, were examined monthly in situ for signs of disease and other stressors from January 2003 through December 2009. During the study, 89.9 % of the colonies ( n = 69) exhibited disease, including white pox (87 %), white band (13 %), and unknown (9 %). Monthly disease prevalence ranged from 0 to 57 %, and disease was the most significant cause of complete colony mortality ( n = 17). A positive correlation was found between water temperature and disease prevalence, but not incidence. Annual average disease prevalence and incidence remained constant during the study. Colonies generally showed an increase in the estimated amount of total living tissue from growth, but 25 (36.2 %) of the colonies died. Acropora palmata bleached in the USVI for the first time during the 2005 Caribbean bleaching event. Only one of the 23 colonies that bleached appeared to die directly from bleaching. In 2005, corals that bleached had greater disease prevalence than those that did not bleach. Just over half (52 %) of the colonies incurred some physical damage. Monitoring of fragments (broken branches) that were generated by physical damage through June 2007 showed that 46.1 % died and 28.4 % remained alive; the fragments that attached to the substrate survived longer than those that did not. Recent surveys showed an increase in the total number of colonies within the reef area, formed from both asexual and sexual reproduction. Genotype analysis of 48 of the originally monitored corals indicated that 43 grew from sexual recruits supporting the conclusion that both asexual and sexual reproduction are contributing to an increase in colony density at this site.

  1. Factors affecting polyphenol biosynthesis in wild and field grown St. John's Wort (Hypericum perforatum L. Hypericaceae/Guttiferae).

    PubMed

    Bruni, Renato; Sacchetti, Gianni

    2009-01-01

    The increasing diffusion of herbal products is posing new questions: why are products so often different in their composition and efficacy? Which approach is more suitable to increase the biochemical productivity of medicinal plants with large-scale, low-cost solutions? Can the phytochemical profile of a medicinal plant be modulated in order to increase the accumulation of its most valuable constituents? Will polyphenol-rich medicinal crops ever be traded as commodities? Providing a proactive answer to such questions is an extremely hard task, due to the large number of variables involved: intraspecific chemodiversity, plant breeding, ontogenetic stage, post-harvest handling, biotic and abiotic factors, to name but a few. An ideal path in this direction should include the definition of optimum pre-harvesting and post-harvesting conditions and the availability of specific Good Agricultural Practices centered on secondary metabolism enhancement. The first steps to be taken are undoubtedly the evaluation and the organization of scattered data regarding the diverse factors involved in the optimization of medicinal plant cultivation, in order to provide an interdisciplinary overview of main possibilities, weaknesses and drawbacks. This review is intended to be a synopsis of the knowledge on this regard focused on Hypericum perforatum L. (Hypericaceae/Guttiferae) secondary metabolites of phenolic origin, with the aim to provide a reference and suggest an evolution towards the maximization of St. John's Wort bioactive constituents. Factors considered emerged not only from in-field agronomic results, but also from physiological, genetical, biotic, abiotic and phytochemical data that could be scaled up to the application level. To increase quality for final beneficiaries, growers' profits and ultimately transform phenolic-rich medicinal crops into commodities, the emerging trend suggests an integrated and synergic approach. Agronomy and genetics will need to develop their

  2. Bleaching, disease and recovery in the threatened scleractinian coral Acropora palmata in St. John, US Virgin Islands: 2003-2010

    USGS Publications Warehouse

    Rogers, C.S.; Muller, E.M.

    2012-01-01

    A long-term study of the scleractinian coral Acropora palmata in the US Virgin Islands (USVI) showed that diseases, particularly white pox, are limiting the recovery of this threatened species. Colonies of A. palmata in Haulover Bay, within Virgin Islands National Park, St. John, were examined monthly in situ for signs of disease and other stressors from January 2003 through December 2009. During the study, 89.9 % of the colonies (n = 69) exhibited disease, including white pox (87 %), white band (13 %), and unknown (9 %). Monthly disease prevalence ranged from 0 to 57 %, and disease was the most significant cause of complete colony mortality (n = 17). A positive correlation was found between water temperature and disease prevalence, but not incidence. Annual average disease prevalence and incidence remained constant during the study. Colonies generally showed an increase in the estimated amount of total living tissue from growth, but 25 (36.2 %) of the colonies died. Acropora palmata bleached in the USVI for the first time during the 2005 Caribbean bleaching event. Only one of the 23 colonies that bleached appeared to die directly from bleaching. In 2005, corals that bleached had greater disease prevalence than those that did not bleach. Just over half (52 %) of the colonies incurred some physical damage. Monitoring of fragments (broken branches) that were generated by physical damage through June 2007 showed that 46.1 % died and 28.4 % remained alive; the fragments that attached to the substrate survived longer than those that did not. Recent surveys showed an increase in the total number of colonies within the reef area, formed from both asexual and sexual reproduction. Genotype analysis of 48 of the originally monitored corals indicated that 43 grew from sexual recruits supporting the conclusion that both asexual and sexual reproduction are contributing to an increase in colony density at this site.

  3. Protective effect of St. John's wort (Hypericum perforatum) extract on 72-hour sleep deprivation-induced anxiety-like behavior and oxidative damage in mice.

    PubMed

    Kumar, Anil; Singh, Anant

    2007-10-01

    Sleep disruption or poor quality of sleep is a common problem associated with depression. Antidepressant drugs have been reported to improve the quality of sleep and behavior. The present study was undertaken to explore the therapeutic potential of Hypericum perforatum (St. John's wort) on behavioral alterations and oxidative damage induced by sleep deprivation in mice. Male laca mice (n = 6 - 10 in each group) were sleep deprived for 72 hours using the grid suspended over water method. Standardized Hypericum perforatum extract and imipramine were administered for five days, starting two days before sleep deprivation. Alterations in body weight, motor activity, anxiety like behavior (mirror chamber, plus maze, zero maze) and oxidative stress parameters (reduced glutathione, catalase, lipid peroxidation and nitrite levels) were observed after drug treatment in sleep-deprived animals. 72-hour sleep deprivation significantly altered body weight, locomotor activity and produced anxiety-like behavior and oxidative damage (depleted reduced glutathione, catalase activity and increased lipid peroxidation and nitrite activity) as compared to the naïve (placed on sawdust) animals (P < 0.05). Treatment with either St. John's wort (200 and 400 mg/kg, P. O.) or with imipramine (10 mg/kg, I. P.) significantly improved body weight, locomotor activity, antianxiety and antioxidant effect as compared to the control group (sleep deprived) (P < 0.05). Co-administration of John's wort (200 mg/kg, P. O.) with imipramine (10 mg/kg, I. P.) further improved body weight, locomotor activity, antianxiety effect as well as reduced oxidative damage in sleep-deprived animal as compared to their effect per se (P < 0.05). The present study suggests that there is therapeutic potential of St. John's wort in the management of sleep deprivation-induced anxiety-like behavior and oxidative damage. PMID:17918039

  4. Spatiotemporal dynamics of counterpropagating Airy beams

    PubMed Central

    Wiersma, Noémi; Marsal, Nicolas; Sciamanna, Marc; Wolfersberger, Delphine

    2015-01-01

    We analyse theoretically the spatiotemporal dynamics of two incoherent counterpropagating Airy beams interacting in a photorefractive crystal under focusing conditions. For a large enough nonlinearity strength the interaction between the two Airy beams leads to light-induced waveguiding. The stability of the waveguide is determined by the crystal length, the nonlinearity strength and the beam’s intensities and is improved when comparing to the situation using Gaussian beams. We further identify the threshold above which the waveguide is no longer static but evolves dynamically either time-periodically or even chaotically. Above the stability threshold, each Airy-soliton moves erratically between privileged output positions that correspond to the spatial positions of the lobes of the counterpropagating Airy beam. These results suggest new ways of creating dynamically varying waveguides, optical logic gates and chaos-based computing. PMID:26315530

  5. Spatiotemporal dynamics of counterpropagating Airy beams

    NASA Astrophysics Data System (ADS)

    Wiersma, Noémi; Marsal, Nicolas; Sciamanna, Marc; Wolfersberger, Delphine

    2015-08-01

    We analyse theoretically the spatiotemporal dynamics of two incoherent counterpropagating Airy beams interacting in a photorefractive crystal under focusing conditions. For a large enough nonlinearity strength the interaction between the two Airy beams leads to light-induced waveguiding. The stability of the waveguide is determined by the crystal length, the nonlinearity strength and the beam’s intensities and is improved when comparing to the situation using Gaussian beams. We further identify the threshold above which the waveguide is no longer static but evolves dynamically either time-periodically or even chaotically. Above the stability threshold, each Airy-soliton moves erratically between privileged output positions that correspond to the spatial positions of the lobes of the counterpropagating Airy beam. These results suggest new ways of creating dynamically varying waveguides, optical logic gates and chaos-based computing.

  6. Image signal transmission with Airy beams.

    PubMed

    Liang, Yi; Hu, Yi; Song, Daohong; Lou, Cibo; Zhang, Xinzheng; Chen, Zhigang; Xu, Jingjun

    2015-12-01

    We propose and demonstrate an approach for image signal transmission based on self-accelerating Airy beams. The spatial information is encoded in the Fourier space through a 4-f telescope system, which can circumvent obstacles to realize a self-bending signal transmission. Furthermore, the information can be retrieved from the Airy beams after propagation through a disordered scattering medium. Our experimental results agree well with theoretical predictions. PMID:26625082

  7. No relevant interaction with alprazolam, caffeine, tolbutamide, and digoxin by treatment with a low-hyperforin St John's wort extract.

    PubMed

    Arold, Gerhard; Donath, Frank; Maurer, Agathe; Diefenbach, Konstanze; Bauer, Steffen; Henneicke-von Zepelin, Hans-Heinrich; Friede, Michael; Roots, Ivar

    2005-04-01

    We evaluated the pharmacokinetic interaction between a low-hyperforin St John's wort (SJW) extract and alprazolam, caffeine, tolbutamide, and digoxin. Previous reports on other SJW products had shown remarkably decreased plasma concentrations of certain co-medicated drugs, which was attributed to an inducing effect of SJW on cytochrome P-450 (CYP) and p-glycoprotein (p-gp) activity. Two randomised, placebo-controlled studies were performed with 28 healthy volunteers (age 18 - 55 years) in each study. In study A, single doses of alprazolam (1 mg; substrate of CYP3A4) and caffeine (100 mg; CYP1A2) were given on days 1 and 11. In study B, single doses of tolbutamide (500 mg, days 1 and 11; CYP2C9) and multiple doses of digoxin (0.75 mg on days -2 and -1, 0.25 mg/die on days 1 to 11; p-gp) were given. The participants received SJW (Esbericum capsules; 240 mg/die of extract, 3.5 mg hyperforin) or placebo on days 2 to 11. Blood for pharmacokinetic analysis was drawn on days 1 and 11. No statistically significant differences were found in the primary kinetic parameter, AUC0 - 24, of alprazolam, caffeine (AUC0 - 12), paraxanthine, tolbutamide, 4-hydroxytolbutamide, and digoxin between the placebo group and the SJW group at the end of the study. The SJW-induced change in AUCs was less than 12 % of the initial median AUC of the participants in studies A and B, thus clinically irrelevant. On day 11, trough concentrations were 2.0 (range 0.6 - 4.1) microg/L and 1.0 (0.2 - 3.9) microg/L for hypericin and pseudohypericin, respectively, whereas hyperforin concentrations were below the quantification limit (< 1 microg/L). Kinetics of investigated probe drugs were only marginally influenced by concomitant treatment with Esbericum capsules. This may be due in particular to the low hyperforin plasma concentration as this SJW component has been shown to activate the PXR receptor which regulates expression of CYP3A4 and p-gp. Our findings corroborate the view that reports about

  8. Application of acoustic velocity meters for gaging discharge of three low-velocity tidal streams in the St. Johns River basin, northeast Florida

    USGS Publications Warehouse

    Sloat, J.V.; Gain, W.S.

    1995-01-01

    Index-velocity data collected with acoustic velocity meters, stage data, and cross-sectional area data were used to calculate discharge at three low-velocity, tidal streamflow stations in north-east Florida. Discharge at three streamflow stations was computed as the product of the channel cross-sectional area and the mean velocity as determined from an index velocity measured in the stream using an acoustic velocity meter. The tidal streamlflow stations used in the study were: Six Mile Creek near Picolata, Fla.; Dunns Creek near Satsuma, Fla.; and the St. Johns River at Buffalo Bluff. Cross-sectional areas at the measurement sections ranged from about 3,000 square feet at Six Mile Creek to about 18,500 square feet at St. Johns River at Buffalo Bluff. Physical characteristics for all three streams were similar except for drainage area. The topography primarily is low-relief, swampy terrain; stream velocities ranged from about -2 to 2 feet per second; and the average change in stage was about 1 foot. Instantaneous discharge was measured using a portable acoustic current meter at each of the three streams to develop a relation between the mean velocity in the stream and the index velocity measured by the acoustic velocity meter. Using least-squares linear regression, a simple linear relation between mean velocity and index velocity was determined. Index velocity was the only significant linear predictor of mean velocity for Six Mile Creek and St. Johns River at Buffalo Bluff. For Dunns Creek, both index velocity and stage were used to develop a multiple-linear predictor of mean velocity. Stage-area curves for each stream were developed from bathymetric data. Instantaneous discharge was computed by multiplying results of relations developed for cross-sectional area and mean velocity. Principal sources of error in the estimated discharge are identified as: (1) instrument errors associated with measurement of stage and index velocity, (2) errors in the representation of

  9. Maps showing ground-water conditions in the Concho, St. Johns, and White Mountains areas, Apache and Navajo Counties, Arizona, 1975

    USGS Publications Warehouse

    Harper, R.W.; Anderson, Thomas Warren

    1976-01-01

    The Concho, St. Johns, and White Mountains areas cover about 2 ,300 sq mi in eastern Arizona. Ground water is present in several aquifers that are made up of one or more formations. The maps show ground-water conditions in the Coconini aquifer; in the Triassic, Cretaceous, and Tertiary rocks; and in the alluvium and basaltic rocks. Information on the maps includes depth to water, altitude of the water level, chemical quality of the water, irrigated area, and hydrographs of the water level in selected wells. Scale 1:125,000. (Woodard-USGS).

  10. Airy-type solitary wave in highly noninstantaneous Kerr media.

    PubMed

    Deng, Fu; Hong, Weiyi; Deng, Dongmei

    2016-07-11

    We investigate the dynamics of a decelerating Airy pulse in the highly noninstantaneous Kerr media. It is found that the deceleration of the Airy pulse can be counteracted by the highly noninstantaneous nonlinearity. When the power of the pulse is specifically chosen, the deceleration of the Airy pulse can be totally restrained, and an Airy-type solitary wave is observed within several dispersion lengths. PMID:27410868

  11. Elegant Hermite-Airy beams

    NASA Astrophysics Data System (ADS)

    Zhou, Guoquan; Zhang, Lijun; Ru, Guoyun

    2015-09-01

    As Ai(x)Ai(-x) can be approximated by \\text{exp}≤ft(-{{x}2}/2\\right) , a kind of elegant Hermite-Airy (EHA) beam that is similar to the elegant Hermite-Gaussian (EHG) beam is introduced in this paper. Analytical expression of the EHA beams passing through an ABCD paraxial optical system is derived. By using the method of numerical fitting, the approximate expressions of 02> , 04> , <\\Thetaj2> , <\\Thetaj4> , and 02\\Thetaj2> for an EHA beam are presented, respectively. When the transverse mode number is larger than 2, 02> , 04> , <\\Thetaj2> , <\\Thetaj4> , and 02\\Thetaj2> of an EHA beam are all larger than those of the EHG beam. Based on the higher-order intensity moments, one can calculate the beam propagation factor, the beam half width, and the kurtosis parameter of the EHA beam passing through an ABCD paraxial optical system. As a numerical example, the propagation characteristics of the EHA beam are demonstrated in free space. Moreover, the propagation properties of the EHA beam are compared with those of the corresponding EHG beam. The evolutionary process of the EHA beam is far slower than that of the corresponding EHG beam. The research denotes that the EHA beams can be used to describe specially distributed optical beams that can not be characterized by the existing EHG beam model. The EHA beam model enriches and replenishes the existing beam model.

  12. Ultrafast Airy beam optical parametric oscillator.

    PubMed

    Apurv Chaitanya, N; Kumar, S Chaitanya; Aadhi, A; Samanta, G K; Ebrahim-Zadeh, M

    2016-01-01

    We report on the first realization of an ultrafast Airy beam optical parametric oscillator (OPO). By introducing intracavity cubic phase modulation to the resonant Gaussian signal in a synchronously-pumped singly-resonant OPO cavity and its subsequent Fourier transformation, we have generated 2-dimensional Airy beam in the output signal across a 250 nm tuning range in the near-infrared. The generated Airy beam can be tuned continuously from 1477 to 1727 nm, providing an average power of as much as 306 mW at 1632 nm in pulses of ~23 ps duration with a spectral bandwidth of 1.7 nm. PMID:27476910

  13. Ultrafast Airy beam optical parametric oscillator

    PubMed Central

    Apurv Chaitanya, N.; Kumar, S. Chaitanya; Aadhi, A.; Samanta, G. K.; Ebrahim-Zadeh, M.

    2016-01-01

    We report on the first realization of an ultrafast Airy beam optical parametric oscillator (OPO). By introducing intracavity cubic phase modulation to the resonant Gaussian signal in a synchronously-pumped singly-resonant OPO cavity and its subsequent Fourier transformation, we have generated 2-dimensional Airy beam in the output signal across a 250 nm tuning range in the near-infrared. The generated Airy beam can be tuned continuously from 1477 to 1727 nm, providing an average power of as much as 306 mW at 1632 nm in pulses of ~23 ps duration with a spectral bandwidth of 1.7 nm. PMID:27476910

  14. Ultrafast Airy beam optical parametric oscillator

    NASA Astrophysics Data System (ADS)

    Apurv Chaitanya, N.; Kumar, S. Chaitanya; Aadhi, A.; Samanta, G. K.; Ebrahim-Zadeh, M.

    2016-08-01

    We report on the first realization of an ultrafast Airy beam optical parametric oscillator (OPO). By introducing intracavity cubic phase modulation to the resonant Gaussian signal in a synchronously-pumped singly-resonant OPO cavity and its subsequent Fourier transformation, we have generated 2-dimensional Airy beam in the output signal across a 250 nm tuning range in the near-infrared. The generated Airy beam can be tuned continuously from 1477 to 1727 nm, providing an average power of as much as 306 mW at 1632 nm in pulses of ~23 ps duration with a spectral bandwidth of 1.7 nm.

  15. Temporal Airy pulses control cell poration

    NASA Astrophysics Data System (ADS)

    Courvoisier, S.; Götte, N.; Zielinski, B.; Winkler, T.; Sarpe, C.; Senftleben, A.; Bonacina, L.; Wolf, J. P.; Baumert, T.

    2016-07-01

    We show that spectral phase shaping of fs-laser pulses can be used to optimize laser-cell membrane interactions in water environment. The energy and peak intensity thresholds required for cell poration with single pulse in the nJ range can be significantly reduced (25% reduction in energy and 88% reduction in peak intensity) by using temporal Airy pulses, controlled by positive third order dispersion, as compared to bandwidth limited pulses. Temporal Airy pulses are also effective to control the morphology of the induced pores, with prospective applications from cellular to tissue opto-surgery and transfection.

  16. 9. Historic American Buildings Survey, John A. Bryan, Photographer July ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. Historic American Buildings Survey, John A. Bryan, Photographer July 9, 1952 SOUTHWEST PERSPECTIVE. - St. John's Episcopal Mission, Chapel & Rectory, Fort Bennett Vicinity, Green Grass, Dewey County, SD

  17. 1. Historic American Buildings Survey, John A. Bryan, Photographer July ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Historic American Buildings Survey, John A. Bryan, Photographer July 9, 1952 SOUTHEAST PERSPECTIVE. - St. John's Episcopal Mission, Chapel & Rectory, Fort Bennett Vicinity, Green Grass, Dewey County, SD

  18. 11. Historic American Buildings Survey, John A. Bryan, Photographer July ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. Historic American Buildings Survey, John A. Bryan, Photographer July 9, 1952 CHAPEL INTERIOR. - St. John's Episcopal Mission, Chapel & Rectory, Fort Bennett Vicinity, Green Grass, Dewey County, SD

  19. Airy, Sir George Biddell (1801-92)

    NASA Astrophysics Data System (ADS)

    Murdin, P.

    2000-11-01

    A brilliant Cambridge mathematician (Senior Wrangler 1823, i.e. leader of the graduating mathematics class), Airy became the seventh Astronomer Royal in 1835 after a brief period as Lucasian Professor at Cambridge. His output was prodigious, and he published nearly 400 scientific papers and 150 reports on various scientific issues, such as the gauge of railways, spectacles to correct astigmatism,...

  20. Time to Talk: What You Should Know about 5 Popular Herbs (Evening Primrose Oil, St. John's Wort, Fenugreek, Echinacea, ....

    MedlinePlus

    ... brought people to our site are evening primrose oil , St. John’s wort , fenugreek , echinacea , and aloe vera . ... tips about these popular herbal supplements: Evening Primrose Oil. Although evening primrose oil has been used as ...

  1. An evaluation of biomarkers of reproductive function and potential contaminant effects in Florida largemouth bass (Micropterus salmoides floridanus) sampled from the St. Johns River

    USGS Publications Warehouse

    Sepulveda, M.S.; Johnson, W.E.; Higman, J.C.; Denslow, N.D.; Schoeb, T.R.; Gross, T.S.

    2002-01-01

    The objective of this study was to describe and compare several reproductive parameters for Florida largemouth bass (Micropterus salmoides floridanus) inhabiting the St. Johns River and exposed to different types and/or degrees of contamination. Welaka was selected as the reference site in this study because of its low urban and agricultural development, Palatka is in close proximity to a paper mill plant, the Green Cove site is influenced by marine shipping activities and Julington Creek site receives discharges of domestic wastewater and storm water runoff from recreational boating marinas. For this study, bass were sampled both prior to (September 1996) and during the spawning season (February 1997). In order to characterize chemical exposure, bass livers were analyzed for up to 90 trace organics and 11 trace metal contaminants. Reproductive parameters measured included gonadosomatic index (GSI), histological evaluation of gonads and plasma concentrations of vitellogenin (VTG), 17??-estradiol (E2) and 11-ketotestosterone (11-KT). In general, the sum of organic chemicals was highest in livers from Palatka bass and bass from Green Cove and Julington Creek had higher hepatic concentrations of low molecular polycyclic aromatic hydrocarbons and polychlorinated biphenyls when compared to fish from Welaka. Metals were more variable across sites, with highest mean concentrations found in bass from either Julington Creek (Ag, As, Cr, Cu, Zn) or Welaka (Cd, Hg, Pb, Se, Tn). Female bass from Palatka and Green Cove had lower concentrations of E2, VTG and lower GSI in relation to Welaka. Males from Palatka and Green Cove showed comparable declines in 11-KT in relation to males from Julington Creek and GSI were decreased only in Palatka males. These results indicate a geographical trend in reproductive effects, with changes being most pronounced at the site closest to the paper mill (Palatka) and decreasing as the St. Johns River flows downstream. Since reproductive

  2. Data from in situ Observations of Fish Traps Set by Fishermen in St. John Waters, U.S. Virgin Islands, 1992-94

    USGS Publications Warehouse

    Garrison, Virginia H.; Beets, Jim; Friedlander, Alan M.; Canty, Steven

    2011-01-01

    In order to estimate (1) the trapping pressure within Virgin Islands National Park (VINP) waters, (2) the effect of fish traps on park marine resources (both fishes and habitats), and (3) the effectiveness of park regulations in protecting marine resources, traps set by fishers were visually observed and contents censused in situ in 1992, 1993, and 1994, around St. John (U.S. Virgin Islands), within and outside of park waters. A total of 1,340 individual fish (56 species and 23 families) were identified and their lengths estimated for the 211 of 285 visually censused traps that contained fish. This dataset includes for each censused trap: location, depth, substrate/habitat, trap type and construction details, in or out of park waters, and species and estimated fork length (in centimeters) of each individual fish in a trap. Analysis and interpretation of this dataset are provided in previously published reports by the author.

  3. Creating Airy beams employing a transmissive spatial light modulator.

    PubMed

    Latychevskaia, Tatiana; Schachtler, Daniel; Fink, Hans-Werner

    2016-08-01

    We present a detailed study of two novel methods for shaping the light optical wavefront by employing a transmissive spatial light modulator (SLM). Conventionally, optical Airy beams are created by employing SLMs in the so-called all-phase mode. In the first method, a numerically simulated lens phase distribution is loaded directly onto the SLM, together with the cubic phase distribution. An Airy beam is generated at the focal plane of the numerical lens. We provide for the first time, to the best of our knowledge, quantitative properties of the formed Airy beam. We derive the formula for deflection of the intensity maximum of the so-formed Airy beam, which is different from the quadratic deflection typical of Airy beams. We cross-validate the derived formula by both simulations and experiment. The second method is based on the fact that a system consisting of a transmissive SLM sandwiched between two polarizers can create a transmission function with negative values. This observation alone has the potential for various other wavefront modulations where the transmission function requires negative values. As an example for this method, we demonstrate that a wavefront can be modulated by passing the SLM system with transmission function with negative values by loading an Airy function distribution directly onto the SLM. Since the Airy function is a real-valued function but also with negative values, an Airy beam can be generated by direct transfer of the Airy function distribution onto such an SLM system. In this way, an Airy beam is generated immediately behind the SLM. As both new methods do not employ a physical lens, the two setups are more compact than conventional setups for creating Airy beams. We compare the performance of the two novel methods and the properties of the created Airy beams. PMID:27505393

  4. Accelerating Airy-Gauss-Kummer localized wave packets

    NASA Astrophysics Data System (ADS)

    Zhong, Wei-Ping; Belić, Milivoj; Zhang, Yiqi; Huang, Tingwen

    2014-01-01

    A general approach to generating three-dimensional nondiffracting spatiotemporal solutions of the linear Schrödinger equation with an Airy-beam time-dependence is reported. A class of accelerating optical pulses with the structure of Airy-Gauss-Kummer vortex beams is obtained. Our results demonstrate that the optical field contributions to the Airy-Gauss-Kummer accelerating optical wave packets of the cylindrical symmetry can be characterized by the radial and angular mode numbers.

  5. Autobiography of Sir George Biddell Airy

    NASA Astrophysics Data System (ADS)

    Airy, George Biddell; Airy, Wilfred

    2010-06-01

    Preface; 1. Personal sketch of George Biddell Airy; 2. From his birth to his taking his B.A. degree; 3. At Trinity College, Cambridge; 4. At Cambridge Observatory; 5. At Greenwich Observatory, 1836-1846; 6. At Greenwich Observatory, 1846-1856; 7. At Greenwich Observatory, 1856-1866; 8. At Greenwich Observatory, 1866-1876; 9. At Greenwich Observatory to his resignation in 1881; 10. At the White House, Greewich, to his death; Appendix: List of printed papers; Index.

  6. The structure of Airy's stress function in multiply connected regions

    NASA Technical Reports Server (NTRS)

    Grioli, Giusippe

    1951-01-01

    In solving two-dimensional problems using Airy's stress function for multiply connected regions, the form of the function depends on the dislocations and boundary forces present. The structure of Airy's function is shown to consist of a part expressible in terms of boundary forces and a part expressible in the manner of Poincare. Meanings of the constants occurring in Poincare's expression are discussed.

  7. Propagation Dynamics of Airy Water-Wave Pulses.

    PubMed

    Fu, Shenhe; Tsur, Yuval; Zhou, Jianying; Shemer, Lev; Arie, Ady

    2015-07-17

    We observe the propagation dynamics of surface gravity water waves, having an Airy function envelope, in both the linear and the nonlinear regimes. In the linear regime, the shape of the envelope is preserved while propagating in an 18-m water tank, despite the inherent dispersion of the wave packet. The Airy wave function can propagate at a velocity that is slower (or faster if the Airy envelope is inverted) than the group velocity. Furthermore, the introduction of the Airy wave packet as surface water waves enables the observation of its position-dependent chirp and cubic-phase offset, predicted more than 35 years ago, for the first time. When increasing the envelope of the input Airy pulse, nonlinear effects become dominant, and are manifested by the generation of water-wave solitons. PMID:26230797

  8. ANS complex of St John's wort PR-10 protein with 28 copies in the asymmetric unit: A fiendish combination of pseudosymmetry with tetartohedral twinning

    SciTech Connect

    Sliwiak, Joanna; Dauter, Zbigniew; Kowiel, Marcin; McCoy, Airlie J.; Read, Randy J.; Jaskolski, Mariusz

    2015-03-26

    Hyp-1, a pathogenesis-related class 10 (PR-10) protein from St John's wort (Hypericum perforatum), was crystallized in complex with the fluorescent probe 8-anilino-1-naphthalene sulfonate (ANS). The highly pseudosymmetric crystal has 28 unique protein molecules arranged in columns with sevenfold translational noncrystallographic symmetry (tNCS) along c and modulated X-ray diffraction with intensity crests at l = 7n and l = 7n ± 3. The translational NCS is combined with pseudotetragonal rotational NCS. The crystal was a perfect tetartohedral twin, although detection of twinning was severely hindered by the pseudosymmetry. The structure determined at 2.4 Å resolution reveals that the Hyp-1 molecules (packed as β-sheet dimers) have three novel ligand-binding sites (two internal and one in a surface pocket), which was confirmed by solution studies. In addition to 60 Hyp-1-docked ligands, there are 29 interstitial ANS molecules distributed in a pattern that violates the arrangement of the protein molecules and is likely to be the generator of the structural modulation. In particular, whenever the stacked Hyp-1 molecules are found closer together there is an ANS molecule bridging them.

  9. ANS complex of St John's wort PR-10 protein with 28 copies in the asymmetric unit: A fiendish combination of pseudosymmetry with tetartohedral twinning

    DOE PAGESBeta

    Sliwiak, Joanna; Dauter, Zbigniew; Kowiel, Marcin; McCoy, Airlie J.; Read, Randy J.; Jaskolski, Mariusz

    2015-03-26

    Hyp-1, a pathogenesis-related class 10 (PR-10) protein from St John's wort (Hypericum perforatum), was crystallized in complex with the fluorescent probe 8-anilino-1-naphthalene sulfonate (ANS). The highly pseudosymmetric crystal has 28 unique protein molecules arranged in columns with sevenfold translational noncrystallographic symmetry (tNCS) along c and modulated X-ray diffraction with intensity crests at l = 7n and l = 7n ± 3. The translational NCS is combined with pseudotetragonal rotational NCS. The crystal was a perfect tetartohedral twin, although detection of twinning was severely hindered by the pseudosymmetry. The structure determined at 2.4 Å resolution reveals that the Hyp-1 molecules (packedmore » as β-sheet dimers) have three novel ligand-binding sites (two internal and one in a surface pocket), which was confirmed by solution studies. In addition to 60 Hyp-1-docked ligands, there are 29 interstitial ANS molecules distributed in a pattern that violates the arrangement of the protein molecules and is likely to be the generator of the structural modulation. In particular, whenever the stacked Hyp-1 molecules are found closer together there is an ANS molecule bridging them.« less

  10. Sediment quality of the lower St. Johns River, Florida: an integrative assessment of benthic fauna, sediment-associated stressors, and general habitat characteristics.

    PubMed

    Cooksey, Cynthia; Hyland, Jeff

    2007-01-01

    Sediment quality of the lower St. Johns River (LSJR) estuary, Florida was evaluated using synoptic data on benthic community structure, levels of potential stressors (chemical contaminants, ammonia and sulfide), and other basic habitat characteristics (depth, dissolved oxygen, salinity, temperature) collected at seven stations, three times a year from July 2000-July 2002. Un-ionized ammonia and hydrogen sulfide were detected at toxic levels on at least one sampling occasion at four stations. Chemical contamination of sediment at probable bioeffect levels also was observed at four stations. Concentrations of pesticides or other chemical substances typically associated with human activities (e.g., PCBs) were detectable at all stations, though not always present at concentrations likely of causing significant bioeffects. A total of 251 taxa and 9783 individuals were identified and enumerated from the benthic infaunal samples. Polychaete worms and molluscs dominated the benthic fauna at all seven stations. The opportunistic and pollution-tolerant polychaete Streblospio benedicti was the most abundant species overall (from all samples combined), appearing as a dominant at five of the seven stations. Overall, the sites sampled as part of this study indicate a highly stressed benthos resulting from multiple anthropogenic impacts. PMID:17070854

  11. An analysis of partnership performance: the St. Johns Mercy Medical Center-Saint Louis University School of Nursing dedicated education unit project.

    PubMed

    Murray, Teri A; Macintyre, Richard C; Teel, Cynthia S

    2011-01-01

    The purpose of this article is to analyze the St. Johns Mercy Medical Center (SJMMC)-Saint Louis University School of Nursing (SLUSON) dedicated education unit (DEU) project for partnership effectiveness. The DEU, an innovative and collaborative academic-service partnership, reconceptualizes the role of the faculty and staff nurse in the clinical educational process. In a DEU, the staff nurse provides the clinical instruction to the student, and the faculty member coaches the staff nurse on the teaching-learning process. Rather than explore the effectiveness of the DEU as an innovative clinical pedagogy, this article analyzes the relationship between the academic and service institutions for strategic effectiveness. The analysis is based on themes found across three successful and distinct academic partnerships and other evaluative models from business, government, and alliance research. The themes and models provide the frameworks needed to analyze the SJMMC-SLUSON academic-service partnership for structure, process, and outcomes. This analysis can serve as a guide for the development of academic-service partnership practices to facilitate successful, sustainable, and replicable partnerships that benefit both institutions. PMID:22142928

  12. Highly Variable Contents of Phenolics in St John's Wort Products Impact Their Transport in the Human Intestinal Caco-2 Cell Model: Pharmaceutical and Biopharmaceutical Rationale for Product Standardization

    PubMed Central

    Gao, Song; Jiang, Wen; Yin, Taijun; Hu, Ming

    2010-01-01

    The purposes of this study were to determine content uniformity of phenolics in the St John's Wort (SJW) supplements, and to demonstrate how variations in the product matrices affect their absorption and efflux. LC and LC-MS/MS methods were used to determine the phenolic contents of twelve different products purchased locally or from the internet. Three representative extracts were further submitted to Caco-2 cell transport experiment and transport of rutin, hyperoside, and isoquercitrin were evaluated. The results indicated that twelve different products displayed twelve different HPLC fingerprints, but all products contained the following major compounds: rutin, hyperoside, isoquercitrin, quercitrin, quercetin, and amentoflavone. The content uniformity of these major compounds was poor across products, with the smallest difference in the amounts of amentoflavone (2.6 folds) and largest difference in that of isoquercitrin (28.8 folds). The Caco-2 experiments indicated transport of rutin was vectorial, with the permeabilities varied about 2 folds in both direction of transport. The vectorial permeabilities of hyperoside and isoquercitrin were similarly different. Use of efflux transporter inhibitors studies suggested that MRP2 was involved in isoquercitrin's efflux and the product matrix affected the extent of its efflux. In conclusion, different SJW supplements had highly variable contents of phenolics, and the variability in product matrix and phytochemical compositions affected the permeabilities of key phenolics across the Caco-2 monolayers, which may further impact their bioavailabilities. Therefore, standardization will be necessary to ensure safe and efficacious use of supplements such as SJW. PMID:20450158

  13. Permanent 'phase shifts' or reversible declines in coral cover? Lack of recovery of two coral reefs in St. John, US Virgin Islands

    USGS Publications Warehouse

    Rogers, C.S.; Miller, J.

    2006-01-01

    Caribbean coral reefs have changed dramatically in the last 3 to 4 decades, with significant loss of coral cover and increases in algae. Here we present trends in benthic cover from 1989 to 2003 at 2 reefs (Lameshur Reef and Newfound Reef) off St. John, US Virgin Islands (USVI). Coral cover has declined in the fore-reef zones at both sites, and no recovery is evident. At Lameshur Reef, Hurricane Hugo (1989) caused significant physical damage and loss of coral. We suggest that macroalgae rapidly colonized new substrate made available by this storm and have hindered or prevented growth of adult corals, as well as settlement and survival of new coral recruits. Overfishing of herbivorous fishes in the USVI and loss of shelter for these fishes because of major storms has presumably reduced the levels of herbivory that formerly controlled algal abundance. Coral cover declined at Newfound Reef from 1999 to 2000, most likely because of coral diseases. The trends that we have documented, loss of coral followed by no evidence of recovery, appear similar to findings from other studies in the Caribbean. We need to focus on functional shifts in the resilience of coral reefs that result in their inability to recover from natural and human-caused stressors. ?? Inter-Research 2006.

  14. Ten years after the crime: Lasting effects of damage from a cruise ship anchor on a coral reef in St. John, U.S. Virgin Islands

    USGS Publications Warehouse

    Rogers, C.S.; Garrison, V.H.

    2001-01-01

    In October 1988, a cruise ship dropped its anchor on a coral reef in Virgin Islands National Park, St. John, creating a distinct scar roughly 128 m long and 3 m wide from a depth of 22 m to a depth of 6 m. The anchor pulverized coral colonies and smashed part of the reef framework. In April 1991, nine permanent quadrats (1 m2) were established inside the scar over a depth range of 9 m to 12.5 m. At that time, average coral cover inside the scar was less than 1%. These quadrats were surveyed again in 1992, 1993, 1994, 1995 and 1998. Recruits of 19 coral species have been observed, with Agaricia agaricites and Porites spp. the most abundant. Quadrats surveyed outside the scar in June 1994 over the same depth range had a higher percent coral cover (mean = 7.4%, SD = 4.5) and greater average size (maximum length) of coral colonies than in quadrats inside the damaged area. Although coral recruits settle into the scar in high densities, live coral cover has not increased significantly in the last 10 yrs, reflecting poor survival and growth of newly settled corals. The relatively planar aspect of the scar may increase the vulnerability of the recruits to abrasion and mortality from shifting sediments. Ten years after the anchor damage occurred, live coral cover in the still-visible scar (mean = 2.6%, SD = 2.7) remains well below the cover found in the adjacent, undamaged reef.

  15. Clinical assessment of CYP2D6-mediated herb-drug interactions in humans: effects of milk thistle, black cohosh, goldenseal, kava kava, St. John's wort, and Echinacea.

    PubMed

    Gurley, Bill J; Swain, Ashley; Hubbard, Martha A; Williams, D Keith; Barone, Gary; Hartsfield, Faith; Tong, Yudong; Carrier, Danielle J; Cheboyina, Shreekar; Battu, Sunil K

    2008-07-01

    Cytochrome P450 2D6 (CYP2D6), an important CYP isoform with regard to drug-drug interactions, accounts for the metabolism of approximately 30% of all medications. To date, few studies have assessed the effects of botanical supplementation on human CYP2D6 activity in vivo. Six botanical extracts were evaluated in three separate studies (two extracts per study), each incorporating 16 healthy volunteers (eight females). Subjects were randomized to receive a standardized botanical extract for 14 days on separate occasions. A 30-day washout period was interposed between each supplementation phase. In study 1, subjects received milk thistle (Silybum marianum) and black cohosh (Cimicifuga racemosa). In study 2, kava kava (Piper methysticum) and goldenseal (Hydrastis canadensis) extracts were administered, and in study 3 subjects received St. John's wort (Hypericum perforatum) and Echinacea (Echinacea purpurea). The CYP2D6 substrate, debrisoquine (5 mg), was administered before and at the end of supplementation. Pre- and post-supplementation phenotypic trait measurements were determined for CYP2D6 using 8-h debrisoquine urinary recovery ratios (DURR). Comparisons of pre- and post-supplementation DURR revealed significant inhibition (approximately 50%) of CYP2D6 activity for goldenseal, but not for the other extracts. Accordingly, adverse herb-drug interactions may result with concomitant ingestion of goldenseal supplements and drugs that are CYP2D6 substrates. PMID:18214849

  16. Complexity of nearshore strontium-to-calcium ratio variability in a core sample of the massive coral Siderastrea siderea obtained in Coral Bay, St. John, U.S. Virgin Islands

    USGS Publications Warehouse

    Reich, Christopher D.; Kuffner, Ilsa B.; Hickey, T. Don; Morrison, Jennifer M.; Flannery, Jennifer A.

    2013-01-01

    Strontium-to-calcium ratios (Sr/Ca) were measured on the skeletal matrix of a core sample from a colony of the massive coral Siderastrea siderea collected in Coral Bay, St. John, U.S. Virgin Islands. Strontium and calcium are incorporated into the coral skeleton during the precipitation of aragonite by the coral polyps and their ratio is highly temperature dependent. The robustness of this temperature dependence makes Sr/Ca a reliable proxy for sea surface temperature (SST). Details presented from the St. John S. siderea core indicate that terrestrial inputs of sediment and freshwater can disrupt the chemical balance and subsequently complicate the utility of Sr/Ca in reconstructing historical SST. An approximately 44-year-long record of Sr/Ca shows that an annual SST signal is recorded but with an increasing Sr/Ca trend from 1980 to present, which is likely the result of runoff from the mountainous terrain of St. John. The overwhelming influence of the terrestrial fingerprint on local seawater chemistry makes utilizing Sr/Ca as a SST proxy in nearshore environments very difficult.

  17. Rainbows: Mie computations and the Airy approximation.

    PubMed

    Wang, R T; van de Hulst, H C

    1991-01-01

    Efficient and accurate computation of the scattered intensity pattern by the Mie formulas is now feasible for size parameters up to x = 50,000 at least, which in visual light means spherical drops with diameters up to 6 mm. We present a method for evaluating the Mie coefficients from the ratios between Riccati-Bessel and Neumann functions of successive order. We probe the applicability of the Airy approximation, which we generalize to rainbows of arbitrary p (number of internal reflections = p - 1), by comparing the Mie and Airy intensity patterns. Millimeter size water drops show a match in all details, including the position and intensity of the supernumerary maxima and the polarization. A fairly good match is still seen for drops of 0.1 mm. A small spread in sizes helps to smooth out irrelevant detail. The dark band between the rainbows is used to test more subtle features. We conclude that this band contains not only externally reflected light (p = 0) but also a sizable contribution f rom the p = 6 and p = 7 rainbows, which shift rapidly with wavelength. The higher the refractive index, the closer both theories agree on the first primary rainbow (p = 2) peak for drop diameters as small as 0.02 mm. This may be useful in supporting experimental work. PMID:20581954

  18. Airy structure in 16O+14C nuclear rainbow scattering

    NASA Astrophysics Data System (ADS)

    Ohkubo, S.; Hirabayashi, Y.

    2015-08-01

    The Airy structure in 16 O +14 C rainbow scattering is studied with an extended double-folding (EDF) model that describes all the diagonal and off-diagonal coupling potentials derived from the microscopic realistic wave functions for 16 O by using a density-dependent nucleon-nucleon force. The experimental angular distributions at EL=132 , 281, and 382.2 MeV are well reproduced by the calculations. By studying the energy evolution of the Airy structure, the Airy minimum around θ =76∘ in the angular distribution at EL=132 MeV is assigned as the second-order Airy minimum A 2 in contrast to the recent literature which assigns it as the third order A 3 . The Airy minima in the 90∘ excitation function is investigated in comparison with well-known 16 O +16 O and 12 C +12 C systems. Evolution of the Airy structure into the molecular resonances with the 16 O +14 C cluster structure in the low-energy region around Ec .m .=30 MeV is discussed. It is predicted theoretically for the first time for a non-4 N 16O +14 C system that Airy elephants in the 90∘ excitation function are present.

  19. Controllable circular Airy beams via dynamic linear potential

    NASA Astrophysics Data System (ADS)

    Zhong, Hua; Zhang, Yiqi; Belić, Milivoj R.; Li, Changbiao; Wen, Feng; Zhang, Zhaoyang; Zhang, Yanpeng

    2016-04-01

    We investigate controllable spatial modulation of circular autofocusing Airy beams, under action of different dynamic linear potentials, both theoretically and numerically. We introduce a novel treatment method in which the circular Airy beam is represented as a superposition of narrow azimuthally-modulated one-dimensional Airy beams that can be analytically treated. The dynamic linear potentials are appropriately designed, so that the autofocusing effect can either be weakened or even eliminated when the linear potential exerts a "pulling" effect on the beam, or if the linear potential exerts a "pushing" effect, the autofocusing effect can be greatly strengthened. Numerical simulations agree with the theoretical results very well.

  20. Accelerating Airy beams in the presence of inhomogeneities

    NASA Astrophysics Data System (ADS)

    Besieris, Ioannis M.; Shaarawi, Amr M.; Zamboni-Rached, Michel

    2016-06-01

    Studies have already been made of accelerating Airy beams in the presence of deterministic inhomogeneities, illustrating, in particular, that the inherent self-healing properties of such beams are preserved. The cases of a range-dependent linear transverse potential and a converging GRIN structure (harmonic oscillator) have been examined thoroughly. Examples will be given in this article of novel accelerating Airy beams in the presence of five other types of potential functions. Three of the resulting exact analytical solutions have a common salient characteristic property: they are constructed using the free-space accelerating Airy beam solution as a seed.

  1. Characterization of the hydrology, water chemistry, and aquatic communities of selected springs in the St. Johns River Water Management District, Florida, 2004

    USGS Publications Warehouse

    Phelps, G.G.; Walsh, Stephen J.; Gerwig, Robert M.; Tate, William B.

    2006-01-01

    The hydrology, water chemistry, and aquatic communities of Silver Springs, De Leon Spring, Gemini Springs, and Green Spring in the St. Johns River Water Management District, Florida, were studied in 2004 to provide a better understanding of each spring and to compile data of potential use in future water-management decisions. Ground water that discharges from these and other north-central Florida springs originates from the Upper Floridan aquifer of the Floridan aquifer system, a karstic limestone aquifer that extends throughout most of the State's peninsula. This report summarizes data about flow, water chemistry, and aquatic communities, including benthic invertebrates, fishes, algae, and aquatic macrophytes collected by the U.S. Geological Survey, the St. Johns River Water Management District, and the Florida Department of Environmental Protection during 2004, as well as some previously collected data. Differences in water chemistry among these springs reflect local differences in water chemistry in the Upper Floridan aquifer. The three major springs sampled at the Silver Springs group (the Main Spring, Blue Grotto, and the Abyss) have similar proportions of cations and anions but vary in nitrate and dissolved oxygen concentrations. Water from Gemini Springs and Green Spring has higher proportions of sodium and chloride than the Silver Springs group. Water from De Leon Spring also has higher proportions of sodium and chloride than the Silver Springs group but lower proportions of calcium and bicarbonate. Nitrate concentrations have increased over the period of record at all of the springs except Green Spring. Compounds commonly found in wastewater were found in all the springs sampled. The most commonly detected compound was the insect repellant N,N'-diethyl-methyl-toluamide (DEET), which was found in all the springs sampled except De Leon Spring. The pesticide atrazine and its degradate 2-chloro-4-isopropylamino-6-amino-s-triazine (CIAT) were detected in water

  2. Effect of nutrients and salinity pulses on biomass and growth of Vallisneria americana in lower St Johns River, FL, USA

    PubMed Central

    Boustany, Ronald G.; Michot, Thomas C.; Moss, Rebecca F.

    2015-01-01

    We determined the interactive effects of nutrient loading and salinity pulsing on Vallisneria americana Michx., the dominant submerged aquatic vegetation species in the lower St Johns River (LSJR), FL, USA, and its associated algal community. Five hundred and ninety 6-inch diameter intact plant plugs of Vallisneria were collected from the LSJR in March 2003 and transported to US Geological Survey mesocosm facilities in Lafayette, LA, USA. A 3×3 experimental design consisting of three nutrient levels (control, 1/3 control and 3× control) and three salinity pulsing regimes (no pulse, 1-pulse at 18 ppt and 2-pulse at 12 and 18 ppt) was implemented with three replicates per treatment for a total of 27 experimental tanks. Salinity pulsing significantly reduced all measured Vallisneria growth parameters including above- and below-ground biomass, areal productivity and leaf area index. Nutrient levels had little effect on plants subjected to salinity pulses, but in non-salinity pulse treatments we observed higher mean macrophyte biomass in the low-nutrient loading treatments. Macroalgal components (epiphytes and surface algal mats) were not significantly different ( p=0.2998 and p=0.2444, respectively), but water column chlorophyll a (phytoplankton) was significantly higher ( p<0.0001) in all salinity pulse treatments except for the 1-pulse, low-nutrient treatment. A single salinity pulse at 18 ppt resulted in 22% pot mortality and two consecutive pulses of 18 and 12 ppt resulted in an additional 14% mortality. Individual leaves and ramets lost 59.7% and 67.8%, respectively, in the combined salinity pulse treatments. Nutrient loading tends to have a long-term effect on Vallisneria through complex community interactions while salinity pulsing frequency and intensity has an immediate and direct influence on growth and distribution. PMID:26064592

  3. Biogeographic variation in genetic variability, apomixis expression and ploidy of St. John's wort (Hypericum perforatum) across its native and introduced range

    PubMed Central

    Molins, Marta Puente; Corral, José M.; Aliyu, Olawale Mashood; Koch, Marcus A.; Betzin, Anja; Maron, John L.; Sharbel, Timothy F.

    2014-01-01

    Background and Aims St. John's wort (Hypericum perforatum) is becoming an important model plant system for investigations into ecology, reproductive biology and pharmacology. This study investigates biogeographic variation for population genetic structure and reproduction in its ancestral (European) and introduced (North America) ranges. Methods Over 2000 individuals from 43 localities were analysed for ploidy, microsatellite variation (19 loci) and reproduction (flow cytometric seed screen). Most individuals were tetraploid (93 %), while lower frequencies of hexaploid (6 %), diploid (<1 %) and triploid (<1 %) individuals were also identified. Key Results A flow cytometric analysis of 24 single seeds per individual, and five individuals per population demonstrated opposite patterns between ploidy types, with tetraploids producing more apomictic (73 %) than sexual (24 %) seed, while hexaploids produced more sexual (73 %) than apomictic (23 %) seed. As hexaploids are derived from tetraploids, these data imply that gene dosage, in addition to the effects of hybridization, influences the switch from apomictic to sexual reproduction. No significant differences in seed production were found between Europe and North America. An analysis of population structure based upon microsatellite profiling demonstrated three major genetic clusters in Europe, whose distribution was reflective of Pleistocene glaciation (e.g. refugia) and post-glacial recolonization of Europe. Conclusions The presence of pure and mixed populations representing all three genetic clusters in North America demonstrates that H. perforatum was introduced multiple times onto the continent, followed by gene flow between the different gene pools. Taken together, the data presented here suggest that plasticity in reproduction has no influence on the invasive potential of H. perforatum. PMID:24344138

  4. St. John's wort attenuates irinotecan-induced diarrhea via down-regulation of intestinal pro-inflammatory cytokines and inhibition of intestinal epithelial apoptosis

    SciTech Connect

    Hu Zeping; Yang Xiaoxia; Chan Suiyung; Xu Anlong; Duan Wei; Zhu Yizhun; Sheu, F.-S.; Boelsterli, Urs Alex; Chan, Eli; Zhang Qiang; Wang, J.-C.; Ee, Pui Lai Rachel; Koh, H.L.; Huang Min; Zhou Shufeng . E-mail: phazsf@nus.edu.sg

    2006-10-15

    Diarrhea is a common dose-limiting toxicity associated with cancer chemotherapy, in particular for drugs such as irinotecan (CPT-11), 5-fluouracil, oxaliplatin, capecitabine and raltitrexed. St. John's wort (Hypericum perforatum, SJW) has anti-inflammatory activity, and our preliminary study in the rat and a pilot study in cancer patients found that treatment of SJW alleviated irinotecan-induced diarrhea. In the present study, we investigated whether SJW modulated various pro-inflammatory cytokines including interleukins (IL-1{beta}, IL-2, IL-6), interferon (IFN-{gamma}) and tumor necrosis factor-{alpha} (TNF-{alpha}) and intestinal epithelium apoptosis in rats. The rats were treated with irinotecan at 60 mg/kg for 4 days in combination with oral SJW or SJW-free control vehicle at 400 mg/kg for 8 days. Diarrhea, tissue damage, body weight loss, various cytokines including IL-1{beta}, IL-2, IL-6, IFN-{gamma} and TNF-{alpha} and intestinal epithelial apoptosis were monitored over 11 days. Our studies demonstrated that combined SJW markedly reduced CPT-11-induced diarrhea and intestinal lesions. The production of pro-inflammatory cytokines such as IL-1{beta}, IFN-{gamma} and TNF-{alpha} was significantly up-regulated in intestine. In the mean time, combined SJW significantly suppressed the intestinal epithelial apoptosis induced by CPT-11 over days 5-11. In particular, combination of SJW significantly inhibited the expression of TNF-{alpha} mRNA in the intestine over days 5-11. In conclusion, inhibition of pro-inflammatory cytokines and intestinal epithelium apoptosis partly explained the protective effect of SJW against the intestinal toxicities induced by irinotecan. Further studies are warranted to explore the potential for STW as an agent in combination with chemotherapeutic drugs to lower their dose-limiting toxicities.

  5. Pharmacokinetics, Safety, and Antiviral Effects of Hypericin, a Derivative of St. John's Wort Plant, in Patients with Chronic Hepatitis C Virus Infection

    PubMed Central

    Jacobson, Jeffrey M.; Feinman, Lawrence; Liebes, Leonard; Ostrow, Nancy; Koslowski, Victoria; Tobia, Alfonso; Cabana, Bernard E.; Lee, Dong-Hun; Spritzler, John; Prince, Alfred M.

    2001-01-01

    Hypericin is a natural derivative of the common St. Johns wort plant, Hypericum perforatum. It has in vitro activity against several viruses, including bovine diarrhea virus, a pestivirus with structural similarities to hepatitis C virus (HCV). We conducted a phase I dose escalation study to determine the safety and antiviral activity of hypericin in patients with chronic HCV infection. The first 12 patients received an 8-week course of 0.05 mg of hypericin per kg of body weight orally once a day; 7 patients received an 8-week course of 0.10 mg/kg orally once a day. At the end of the 8-week period of treatment, no subject had a change of plasma HCV RNA level of more than 1.0 log10. Five of 12 subjects receiving the 0.05-mg/kg/day dosing schedule and 6 of 7 subjects receiving the 0.10-mg/kg/day dosing schedule developed phototoxic reactions. No other serious adverse events associated with hypericin use occurred. The pharmacokinetic data revealed a long elimination half-life (mean values of 36.1 and 33.8 h, respectively, for the doses of 0.05 and 0.1 mg/kg) and mean area under the curve determinations of 1.5 and 3.1 μg/ml × hr, respectively. In sum, hypericin given orally in doses of 0.05 and 0.10 mg/kg/d caused considerable phototoxicity and had no detectable anti-HCV activity in patients with chronic HCV infection. PMID:11158749

  6. Watershed-Marine Linkages: Monitoring how Terrigenous Runoff and Wave-Induced Resuspension Affect Marine Sediment Dynamics in Bays with Coral Reefs, St. John, USVI

    NASA Astrophysics Data System (ADS)

    Campbell, S.; Gray, S. C.; Whinney, J.; Ramos-Scharron, C. E.; Campbell, S.; LaFevor, M. C.

    2015-12-01

    In the USVI, land-based sedimentation in coastal marine environments has increased due to watershed development and is a major cause of coral reef degradation. Watershed runoff and wave/current-induced resuspension of benthic sediment contribute to turbidity/sedimentation. Our objectives are to characterize the spatial and temporal variability of marine sediment dynamics in response to runoff and resuspension in shoreline and reef areas of St. John, USVI, and directly compare the efficacy of time-integrated vs. high-resolution sediment monitoring approaches. To complement a six-year sediment trap study of sedimentation, nephelometers (10-min resolution) were deployed alongside sediment traps (26 day resolution) at four ephemeral stream outfalls and three reefs sites below comparable developed and minimally developed catchments. Watershed runoff was monitored using stream (10-min resolution) and peak crest (2-week resolution) gauges. Mean turbidity/deposition were 4/5 times greater at shore compared to reef sites, 5/6 times greater below developed compared to minimally developed catchments, 2/4 times greater during runoff compared to non-runoff periods, and 100/500 times background levels (time series median) following the largest runoff event of the 5-month time series. Turbidity values due to resuspension during non-runoff periods were primarily controlled by wave height (71% of the variability), tides, and the presence of finer sediment grains. However, the relative contribution to total sedimentation of resuspension vs. watershed runoff varied spatially between sites due to variations in bay geography, benthic sediment grain size, and catchment characteristics. Sediment traps and nephelometers recorded generally consistent temporal patterns of sedimentation at most sites. Though our study confirmed that watershed development increases turbidity and deposition in bays with coral reefs, multiple processes govern sediment dynamics and the distribution of sediments

  7. Controllable Airy-like beams induced by tunable phase patterns

    NASA Astrophysics Data System (ADS)

    Li, D.; Qian, Y.

    2016-01-01

    We propose and experimentally observe a novel family of Airy-like beams. First, we theoretically investigate the physical generation of our proposed controllable Airy-like beams by introducing a rotation angle factor into the phase function, which can regulate and flexibly control the beam wavefront. Meanwhile we can also readily control the main lobes of these beams to follow appointed parabolic trajectories using the rotation angle factor. We also demonstrate that the controllable Airy-like beams lack the properties of being diffraction-free and self-healing. The experiments are performed and the results are in accord with the theoretical simulations. We believe that the intriguing characteristics of our proposed Airy-like beams could provide more degrees of freedom, and are likely to give rise to new applications and lend versatility to the emerging field.

  8. Quasi-Airy beams along tunable propagation trajectories and directions.

    PubMed

    Qian, Yixian; Zhang, Site

    2016-05-01

    We present a theoretical and experimental exhibit that accelerates quasi-Airy beams propagating along arbitrarily appointed parabolic trajectories and directions in free space. We also demonstrate that such quasi-Airy beams can be generated by a tunable phase pattern, where two disturbance factors are introduced. The topological structures of quasi-Airy beams are readily manipulated with tunable phase patterns. Quasi-Airy beams still possess the characteristics of non-diffraction, self-healing to some extent, although they are not the solutions for paraxial wave equation. The experiments show the results are consistent with theoretical predictions. It is believed that the property of propagation along arbitrarily desired parabolic trajectories will provide a broad application in trapping atom and living cell manipulation. PMID:27137563

  9. AiryÕs Greenwich Staff

    NASA Astrophysics Data System (ADS)

    Chapman, A.

    2012-01-01

    One major research development in the history of astronomy, pioneered in particular by the SHA, is a shift from the concern with what the ÔgiantsÕ, such as Galileo or Newton, achieved to an examination of the wider spectrum of astronomical personnel. And one rich field of inquiry here is that body of men, and later of women, who earned their livings as assistant astronomers. It is, in fact, an abundantly documented area, including figures employed in Grand Amateur, university, and civic observatories, though without doubt the richest and longest-running body of data pertaining to what might be called the ÔAstronomersÕ GentlemenÕ comes from the archives of the Royal Observatory, Greenwich, especially for the years 1835 to 1881, when Sir George Biddell Airy was Astronomer Royal.

  10. Dynamical deformed Airy beams with arbitrary angles between two wings.

    PubMed

    Liang, Yi; Hu, Yi; Ye, Zhuoyi; Song, Daohong; Lou, Cibo; Zhang, Xinzheng; Xu, Jingjun; Morandotti, Roberto; Chen, Zhigang

    2014-07-01

    We study both numerically and experimentally the acceleration and propagation dynamics of 2D Airy beams with arbitrary initial angles between their "two wings." Our results show that the acceleration of these generalized 2D Airy beams strongly depends on the initial angles and cannot be simply described by the vector superposition principle (except for the normal case of a 90° angle). However, as a result of the "Hyperbolic umbilic" catastrophe (a two-layer caustic), the main lobes of these 2D Airy beams still propagate along parabolic trajectories even though they become highly deformed. Under such conditions, the peak intensity (leading energy flow) of the 2D Airy beams cannot be confined along the main lobe, in contrast to the normal 90° case. Instead, it is found that there are two parabolic trajectories describing the beam propagation: one for the main lobe, and the other for the peak intensity. Both trajectories can be readily controlled by varying the initial wing angle. Due to their self-healing property, these beams tend to evolve into the well-known 1D or 2D Airy patterns after a certain propagation distance. The theoretical analysis corroborates our experimental observations, and explains clearly why the acceleration of deformed Airy beams increases with the opening of the initial wing angle. PMID:25121433

  11. Long-term performance of bicarbonate-form anion exchange: removal of dissolved organic matter and bromide from the St. Johns River, FL, USA.

    PubMed

    Walker, Krystal M; Boyer, Treavor H

    2011-04-01

    The goal of this research was to evaluate the long-term performance of magnetic ion exchange (MIEX) treatment using bicarbonate as the mobile counter ion (i.e., MIEX-HCO(3)) and sodium bicarbonate for regeneration. This work is important because there are many unknowns concerning the affinity and regeneration efficiency of bicarbonate-form anion exchange, whereas chloride-form anion exchange (i.e., MIEX-Cl resin) is well-studied. Raw water samples were collected approximately two times per month for one year from a single location on the St. Johns River (SJR), FL, USA. The SJR is characterized by high concentrations of dissolved organic carbon (DOC; 12-26 mg C/L) and bromide (550-1100 μg/L), and is being considered as an alternative drinking water supply. Jar tests were conducted using MIEX-HCO(3) resin, and MIEX-Cl resin was used as a baseline for comparison. The same batch of MIEX-HCO(3) and MIEX-Cl resin was used for the entire study, which was accomplished by regenerating the resins after each jar test in concentrated solutions of sodium bicarbonate and sodium chloride, respectively, and resulted in 21 regeneration cycles. Maximum removal efficiency was achieved with fresh MIEX-HCO(3) resin and virgin MIEX-Cl resin. Both forms of fresh/virgin MIEX resin also had the same affinity sequence with sulfate ≈ UV-absorbing substance > DOC > bromide. The removal efficiency of both forms of MIEX resin decreased as the number of regeneration cycles increased, with MIEX-HCO(3) resin showing 7-18% lower removals than MIEX-Cl resin after 21 regeneration cycles. The affinity sequence of regenerated MIEX-HCO(3) and MIEX-Cl resins differed from fresh resin with UV-absorbing substances > DOC > sulfate > bromide. Scanning electron microscopy and simulated MIEX-HCO(3) treatment under rapidly changing water quality were also used to improve the understanding of bicarbonate-form anion exchange. The major contribution of this research is a systematic study of the extended use of

  12. Dispersive Tidal Plume Modeling of Brine Discharge from Reverse Osmosis (RO) Desalination System, Coral Bay, St. John, USVI using Finite Segment Steady-state Response Matrix (SSRM)

    NASA Astrophysics Data System (ADS)

    Yoon, J.; Shahvari, A.

    2011-12-01

    This characterization and modeling study of dispersive tidal plume of brine discharge from reverse osmosis (RO) desalination system is a part of the Environmental Assessment (EA) for a new reverse osmosis system in the Coral Bay, St. John, USVI (US Virgin Island). Main foci are on developing the tidal longitudinal (perpendicular to the shoreline) and lateral (parallel to the shoreline) dispersion coefficients and subsequently characterize dispersion and mixing characterization of the negatively buoyant brine discharge plume from the proposed reverse osmosis plant to evaluate the level of salinity variations in the nearshore mixing plume in regard to existing coral reef ecosystem. An in situ dye study was conducted by a marine biologist for this purpose to estimate brine discharge plume dispersion coefficients under oscillatory tidal transport and fate flux for current and proposed plant configuration. Additional tidal and surface runoff hydrologic data, bathymetric data and brine discharge characteristics in the vicinity of the brine discharge location are reflected in this study. With estimated dispersion coefficients, eighteen brine discharge scenarios were evaluated to model anticipated dispersive characteristics under varying operational conditions and ambient tidal current conditions for average measured salinity of 33.27 PSU in loco as well as a standard 35 PSU for typical nearshore water salinity variations. Modeling results indicated that the dispersive tidal plume of design brine discharge from reverse osmosis (RO) desalination system at a discharge of 150,000 gpd would raise salinity no higher than 0.0123 PSU in receiving nearshore estuarine water (Maximum concentration at the segment 3 = 33.2822 PSU at Δt = 12 hrs and 24 hrs in diurnal tidal cycle under when the brine discharge with Base+25% concentration, 81.25 PSU at brine discharge rate of 0.0066 m3/sec, and with a minimum direct overland flow efflux at 0.003 m3/sec - this is a "worst-case" operating

  13. 75 FR 43816 - Amendment of Class E Airspace; Mount Airy, NC

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-27

    ...This action amends Class E Airspace at Mount Airy, NC, to accommodate the additional airspace needed for the Standard Instrument Approach Procedures (SIAPs) developed for Mount Airy-Surry County...

  14. Generation and propagation dynamics of Airy beam with the tunable tail

    NASA Astrophysics Data System (ADS)

    Liu, Huilong; Lü, Yanfei; Xia, Jing; Pu, Xiaoyun; Zhang, Li

    2016-05-01

    We introduce a new kind of Airy beam called Airy beam with the tunable tail, which can be generated from the elliptical flat-topped Gaussian beam. The analytical formula of Airy beam with the tunable tail is derived. Airy beam with the single tail can be obtained by adjusting the ration of the beam width of elliptical flat-topped Gaussian beam. The tail length of Airy beam can be controlled by the order N of incident beam. The normalized intensity distributions of Airy beam with the tunable tail propagating in free space are studied, and the propagation dynamics of Airy beam with the single tail are investigated. Compared with the Airy beam generated from the fundamental Gaussian beam or the flat-topped Gaussian beam, some interesting and useful information has been found.

  15. 10. Historic American Buildings Survey, John A. Bryan, Photographer July ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. Historic American Buildings Survey, John A. Bryan, Photographer July 9, 1952 MEMORIAL PLAQUE IN CHAPEL. - St. John's Episcopal Mission, Chapel & Rectory, Fort Bennett Vicinity, Green Grass, Dewey County, SD

  16. 6. Historic American Buildings Survey, John A. Bryan, Photographer July ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. Historic American Buildings Survey, John A. Bryan, Photographer July 9, 1952 SOUTH WALL OF CHAPEL. - St. John's Episcopal Mission, Chapel & Rectory, Fort Bennett Vicinity, Green Grass, Dewey County, SD

  17. 8. Historic American Buildings Survey, John A. Bryan, Photographer July ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. Historic American Buildings Survey, John A. Bryan, Photographer July 9, 1952 WEST ELEVATION OF CHAPEL. - St. John's Episcopal Mission, Chapel & Rectory, Fort Bennett Vicinity, Green Grass, Dewey County, SD

  18. 7. Historic American Buildings Survey, John A. Bryan, Photographer July ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. Historic American Buildings Survey, John A. Bryan, Photographer July 9, 1952 CHAPEL AND CLASSROOM, SOUTHWEST PERSPECTIVE. - St. John's Episcopal Mission, Chapel & Rectory, Fort Bennett Vicinity, Green Grass, Dewey County, SD

  19. Vessel extraction using the Buckmaster-Airy filter

    NASA Astrophysics Data System (ADS)

    Sanchez, Valentina

    2016-05-01

    A new and powerful technique for vessel extraction from biomedical images using the so called Buckmaster- Airy Filter is designed, prototyped and tested. The design, the prototyping and the testing were performed using computer algebra software, specifically the Maple package ImageTools. Some preliminary experiments were performed ant the results were excellent. Our new technique is based on partial differential equations.. Specifically two dimensional Airy diffusion equation and the two dimensional Buckmaster equation were used for designing the new Buckmaster-Airy Filter. Such new filter is able to enhance the quality of an image, producing simultaneously noise elimination, but without altering the edges of the image. The new Bukmaster-Airy filter is applied to the target image via discrete convolution. The results of some experiments of vessel extraction will be presented; and some lines for future research such as the possible implementation of the Buckmaster-Airy Filter as a new plugging for the program ImageJ, will be proposed.

  20. A comparison of the geochemical signatures of water-rock interaction and erosion rates between developed and undeveloped watersheds, St. John, US Virgin Islands

    NASA Astrophysics Data System (ADS)

    Gudino, N.; Kretzschmar, T.; Gray, S. C.

    2012-12-01

    Human activities such as deforestation, agriculture, and the building of dirt roads may increase soil erosion and the delivery of land-based sediment into coastal waters from steep sub-tropical islands. These changes may also affect water-rock interaction, which alters the geochemistry of storm waters and the clay mineralogy of eroded sediments. In the US Virgin Islands, land-based sedimentation is thought to be a major cause of the decline of near-shore coral reefs. The objective of this study was to 1) evaluate whether chemical erosion (water-rock interaction) during storms affected the major-element chemistry of storm-water and the clay mineralogy of eroded sediments; and 2) determine if enhanced erosion associated with human activities may impact these parameters. Our approach was to compare storm-water and sediment geochemistry and modeled erosion rates between developed (Coral Bay) and undeveloped (Lameshur) watersheds on St. John, USVI. Terrestrial and marine sediment samples and runoff samples from three storm events, including Hurricane Otto (Oct. 7-9th), were collected during the 2010 hurricane season in Coral Bay and Lameshur watersheds and bays. Major elements in storm waters were measured using ICP-AES. The mineral saturation index was calculated using "The Geochemist's Workbench" (GWB), supported by X-Ray Diffraction analysis on clay minerals. The Revised and Modified Universal Soil Loss Equations were used to estimate both annual mean (2010, RUSLE) and storm-event (Hurricane Otto, MUSLE) based erosion rates. In addition, rates of marine terrigenous sediment accumulation were estimated by Loss On Ignition (LOI) analysis of marine sediment collected using submarine sediment trap arrays. Spatial variations in calcium, magnesium, sodium and potassium concentrations in storm water samples were measured and only calcium was statistical different (p<0.05) between the developed and undeveloped study sites during Hurricane Otto. Event specific differences in

  1. Coral bleaching, hurricane damage, and benthic cover on coral reefs in St. John, U.S. Virgin Islands: A comparison of surveys with the chain transect method and videography

    USGS Publications Warehouse

    Rogers, C.S.; Miller, J.

    2001-01-01

    The linear chain transect method and videography were used to quantify the percent cover by corals, macroalgae, gorgonians, other living organisms, and substrate along permanent transects on two fringing reefs off St. John. Both methods were used simultaneously on Lameshur reef in November 1998, and on Newfound reef in March and October 1998. Hurricane Georges passed over St. John in September 1998, and a severe coral bleaching episode began the same month. Both methods gave remarkably similar values for coral cover, while the video method gave consistently higher values for gorgonians and macroalgae. The most dramatic difference was in the quantification of bleaching. At Newfound, the chain method indicated 13.4% (SD = 14.1) of the coral tissues were bleached and the video method, 43.4% (SD = 13.0). Corresponding values at Lameshur were 18.1% (SD = 22.3) and 46.5% (SD = 13.3). Although hurricane damage was conspicuous at Newfound reef, neither method showed significant changes in coral cover or other categories as a result of the storm.

  2. Airy-Kaup-Kupershmidt filters applied to digital image processing

    NASA Astrophysics Data System (ADS)

    Hoyos Yepes, Laura Cristina

    2015-09-01

    The Kaup-Kupershmidt operator is applied to the two-dimensional solution of the Airy-diffusion equation and the resulting filter is applied via convolution to image processing. The full procedure is implemented using Maple code with the package ImageTools. Some experiments were performed using a wide category of images including biomedical images generated by magnetic resonance, computarized axial tomography, positron emission tomography, infrared and photon diffusion. The Airy-Kaup-Kupershmidt filter can be used as a powerful edge detector and as powerful enhancement tool in image processing. It is expected that the Airy-Kaup-Kupershmidt could be incorporated in standard programs for image processing such as ImageJ.

  3. Improved Intrapulse Raman Scattering Control via Asymmetric Airy Pulses

    NASA Astrophysics Data System (ADS)

    Hu, Yi; Tehranchi, Amirhossein; Wabnitz, Stefan; Kashyap, Raman; Chen, Zhigang; Morandotti, Roberto

    2015-02-01

    We experimentally demonstrate the possibility of tuning the frequency of a laser pulse via the use of an Airy pulse-seeded soliton self-frequency shift. The intrinsically asymmetric nature of Airy pulses, typically featured by either leading or trailing oscillatory tails (relatively to the main lobe), is revealed through the nonlinear generation of both a primary and a secondary Raman soliton self-frequency shift, a phenomenon which is driven by the soliton fission processes. The resulting frequency shift can be carefully controlled by using time-reversed Airy pulses or, alternatively, by applying an offset to the cubic phase modulation used to generate the pulses. When compared with the use of conventional chirped Gaussian pulses, our technique brings about unique advantages in terms of both efficient frequency tuning and feasibility, along with the generation and control of multicolor Raman solitons with enhanced tunability. Our theoretical analysis agrees well with our experimental observations.

  4. Optical trapping and manipulation of Mie particles with Airy beam

    NASA Astrophysics Data System (ADS)

    Zhao, Ziyu; Zang, Weiping; Tian, Jianguo

    2016-02-01

    In this paper we calculate the radiation forces and moving trajectories of Mie particles induced by 1D Airy beams using the plane wave spectrum method and arbitrary beam theory. Numerical results show that both the transverse and the longitudinal radiation forces are deeply dependent on the relative refractive index, radii and positions of the scattering particles illuminated by the Airy beam. Due to the radiation forces, Mie particles with different radii and initial positions can be dragged into the nearest main intensity lobes, and move along parabolic trajectories in the direction of the Poynting vector. At the ends of these trajectories, in the presence of Brownian force, the trapped scattering particles show irregular Brownian movement near their equilibrium positions. This characteristic property of Airy beams enables optical sorting to be used more easily in the colloidal and biological sciences.

  5. Super-resolution imaging based on virtual Airy spot

    NASA Astrophysics Data System (ADS)

    Liu, Zhengjun; Guo, Cheng; Cui, Junning; Wu, Qun

    2015-02-01

    Based on the theoretical model of Airy spot, a method is proposed for improving the imaging speed from confocal microscopy. The virtual Airy spot is designed for obtaining the pattern on CCD at detecting plane. Here the size of the spot is determined by the parameters of imaging system and intensity data from point detector, which can receive data quicker than CCD. The treatment can improve the speed of imaging comparing with CCD at receiving end. The virtual structured detection is also utilized for generating high-resolution image. Some numerical simulation results are provided for demonstrating the validity of the proposed method.

  6. Photorefractive and computational holography in the experimental generation of Airy beams

    NASA Astrophysics Data System (ADS)

    Suarez, Rafael A. B.; Vieira, Tarcio A.; Yepes, Indira S. V.; Gesualdi, Marcos R. R.

    2016-05-01

    In this paper, we present the experimental generation of Airy beams via computational and photorefractive holography. Experimental generation of Airy beams using conventional optical components presents several difficulties and a practically infeasible. Thus, the optical generation of Airy beams has been made from the optical reconstruction of a computer generated hologram implemented by a spatial light modulator. In the photorefractive holography technique, being used for the first time to our knowledge, the hologram of an Airy beam is constructed (recorded) and reconstructed (read) optically in a nonlinear photorefractive medium. The Airy beam experimental realization was made by a setup of computational and photorefractive holography using a photorefractive Bi12 TiO20 crystal as holographic recording medium. Airy beams and Airy beam arrays were obtained experimentally in accordance with the predicted theory; with excellent prospects for applications in optical trapping and optical communications systems.

  7. John Napier

    ERIC Educational Resources Information Center

    Bryant, Kylie; Scott, Paul

    2004-01-01

    John Napier was born in 1550 in the Tower of Merchiston, near Edinburgh, Scotland. Napier's work on logarithms greatly influenced the work that was to be done in the future. The logarithm's ability to simplify calculations meant that Kepler and many others were able to find the relationships and formulas for motion of bodies. In turn, Kepler's…

  8. John Manke

    NASA Technical Reports Server (NTRS)

    1981-01-01

    On October 1, 1981, John A. Manke was named to head the Directorate of Flight Operations, Ames Research Center, which resulted from the consolidation of NASA's Dryden Flight Research Center at Edwards, California, and Ames Research Center, Moffett Field, California. He also served as site manager of the NASA Ames-Dryden Flight Research Facility. Prior to this assignment, he served as Director of the Flight Operations and Support Directorate at Dryden. Manke attended the University of South Dakota before joining the U.S. Navy in 1951. He graduated from Marquette University at Milwaukee, Wisconsin, in 1956 with a Bachelor Degree in Electrical Engineering. While at school he was selected for the NROTC program and after graduating in 1956 entered flight training and served as a fighter pilot with the U.S. Marine Corps. John left the service in 1960, and prior to joining NASA, worked for Honeywell Corporation as a test engineer. John joined Dryden in 1962 as a research engineer and later became a research pilot, testing advanced craft such as the wingless lifting bodies, forerunners of the Space Shuttle. He was project pilot on the X-24B and also flew the M-2, HL-10 and the X-24A lifting bodies. Manke retired on April 27, 1984. John is a member of the Society of Experimental Test Pilots. He has been honored with two NASA Medals of Outstanding Leadership, two NASA Medals for Exceptional Service and was selected for the Aerospace Walk of Honor in 1997.

  9. Proceedings of the 2011 Annual Meeting of the Canadian Mathematics Education Study Group = Actes De La Rencontre Annuelle 2011 Du Groupe Canadien D'étude en Didactique Des Mathématiques (35th, St. John's, Newfoundland, Canada, June 10-14, 2011)

    ERIC Educational Resources Information Center

    Liljedahl, Peter, Ed.; Oesterle, Susan, Ed.; Allan, Darien, Ed.

    2012-01-01

    This submission contains the Proceedings of the 2011 Annual Meeting of the Canadian Mathematics Education Study Group (CMESG), held at Memorial University of Newfoundland in St. John's, Newfoundland. The CMESG is a group of mathematicians and mathematics educators who meet annually to discuss mathematics education issues at all levels of…

  10. Experimental observation and analysis of all-fiber plasmonic double Airy beams.

    PubMed

    Guan, Chunying; Ding, Ming; Shi, Jinhui; Hua, Ping; Wang, Pengfei; Yuan, Libo; Brambilla, Gilberto

    2014-07-28

    The propagation dynamics of all-fiber plasmonic double parallel and orthogonal Airy beams are experimentally demonstrated. Two slits and groove arrays were fabricated by focused ion beam (FIB) milling on the gold coated end facet of an optical fiber to generate two Airy beams simultaneously. Sub-wavelength self-focusing of double parallel Airy beams in free space is experimentally verified. Effects of geometrical parameters on the intensity profiles of the focal spot are analyzed in detail. The characteristics at the junction of the two main lobes can be adjusted by controlling the initial phase difference of the two Airy beams. The propagation of two orthogonal Airy beams is also experimentally investigated. Multi-Airy beams are of importance to realize all-fiber optical trapping, fiber integrated devices, and laser shaping. PMID:25089455

  11. Multi-focus of modulated polarized Airy beam

    NASA Astrophysics Data System (ADS)

    Zhao, Hongyang; Lin, Jie; Tan, Jiubin; Jin, Peng

    2016-07-01

    The focusing performance of a modulated polarized Airy beam is explored by using the Richards and Wolf vectorial diffraction model in a high numerical aperture system. The multiple foca appeared on the focal plane or along the optical axis when a complex amplitude modulating function was introduced. Two focusing spots with long-focal-depth were additionally observed due to the Airy beam and complex amplitude modulation. The distance between the focuses were changed from 1.15λ to 3.56λ with FWHM of 0.9λ for one-dimensional linear polarized incident beam and from 1.15λ to 3.64λ for two-dimensional beam. The multiple focusing spots are expected to apply in the field of optical trapping and particle acceleration.

  12. Propagation of Airy Gaussian vortex beams in uniaxial crystals

    NASA Astrophysics Data System (ADS)

    Weihao, Yu; Ruihuang, Zhao; Fu, Deng; Jiayao, Huang; Chidao, Chen; Xiangbo, Yang; Yanping, Zhao; Dongmei, Deng

    2016-04-01

    The propagation dynamics of the Airy Gaussian vortex beams in uniaxial crystals orthogonal to the optical axis has been investigated analytically and numerically. The propagation expression of the beams has been obtained. The propagation features of the Airy Gaussian vortex beams are shown with changes of the distribution factor and the ratio of the extraordinary refractive index to the ordinary refractive index. The correlations between the ratio and the maximum intensity value during the propagation, and its appearing distance have been investigated. Project supported by the National Natural Science Foundation of China (Grant Nos. 11374108, 11374107, 10904041, and 11547212), the Foundation of Cultivating Outstanding Young Scholars of Guangdong Province, China, the CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, the National Training Program of Innovation and Entrepreneurship for Undergraduates (Grant No. 2015093), and the Science and Technology Projects of Guangdong Province, China (Grant No. 2013B031800011).

  13. Propagation of time-truncated Airy-type pulses in media with quadratic and cubic dispersion.

    PubMed

    Borda-Hernández, José A; Zamboni-Rached, Michel; Shaarawi, Amr; Besieris, Ioannis M

    2015-10-01

    In this paper, we describe analytically the propagation of Airy-type pulses truncated by a finite-time aperture when second- and third-order dispersion effects are considered. The mathematical method presented here, which is based on the superposition of exponentially truncated Airy pulses, is very effective and allows us to avoid the use of time-consuming numerical simulations. We analyze the behavior of the time-truncated ideal Airy pulse and also the interesting case of a time-truncated Airy pulse with a "defect" in its initial profile, which reveals the self-healing property of this kind of pulse solution. PMID:26479932

  14. 75 FR 14381 - Amendment of Class E Airspace; Mount Airy, NC

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-25

    ...This action proposes to amend Class E Airspace at Mount Airy, NC, to accommodate the additional airspace needed for the Standard Instrument Approach Procedures (SIAPs) developed for Mount Airy-Surry County Airport. This action enhances the safety and airspace management of Instrument Flight Rules (IFR) operations at the...

  15. Quantum polarization fluctuations of an Airy beam in turbulent atmosphere in a slant path.

    PubMed

    Yin, Xia; Zhang, Licheng

    2016-07-01

    Polarization of light has many applications in quantum information processing, including quantum teleportation and dense coding. In this paper, we investigate the polarization fluctuations of Airy beams propagating in a slant turbulent channel under the "few-photon" limit. Using the quantum Stokes parameters and the quantum degree of polarization, we demonstrate that the degree of polarization of Airy beams increases significantly with the large number of the detection photons, and a higher photon-number level can retain the stability of polarization. Numerical simulations show that the longer propagation distance and the stronger turbulence will lead to less oscillatory behaviors and a decrease in the polarization degree of Airy beams, but a bigger exponential truncation factor will cause an increase in the polarization degree of Airy beams. In contrast with Gaussian beams, the degree of polarization of Airy beams is less affected by atmospheric turbulence and propagation distance under the same conditions, which means that Airy beams possess a resilient ability against turbulence-induced perturbations. These results indicate that Airy beams have great potential for applications in long-distance free-space optical communications to improve the performance of a polarization-encoded free-space quantum communication system. PMID:27409692

  16. Analytical study of the self-healing property of Airy beams

    NASA Astrophysics Data System (ADS)

    Chu, Xiuxiang; Zhou, Guoquan; Chen, Ruipin

    2012-01-01

    An analytical expression for the optical field of an Airy beam partially blocked by an opaque obstacle is derived. The self-healing properties of the Airy beam are studied and discussed in detail. The study shows that the self-healing process of the Airy beam is affected by many factors such as the opaque obstacle size, propagation distance, wavelength, and parameters of the Airy beam. The self-healing process is caused by the convergence of energy from the side to the position of the opaque obstacle and is finished when the convergence of energy flow disappears. When the propagation distance is short, the main lobe of the Airy beam is affected by the obstruction located near the main lobe. When the propagation distance is long, the main lobe of the Airy beam can be affected by the obstruction located far away from the main lobe. The result agrees with the existing results and can be explained by the caustic of the Airy beam.

  17. Generalized Airy functions for use in one-dimensional quantum mechanical problems

    NASA Technical Reports Server (NTRS)

    Eaves, J. O.

    1972-01-01

    The solution of the one dimensional, time independent, Schroedinger equation in which the energy minus the potential varies as the nth power of the distance is obtained from proper linear combinations of Bessel functions. The linear combinations called generalized Airy functions, reduce to the usual Airy functions Ai(x) and Bi(x) when n equals 1 and have the same type of simple asymptotic behavior. Expressions for the generalized Airy functions which can be evaluated by the method of generalized Gaussian quadrature are obtained.

  18. Control on the anomalous interactions of Airy beams in nematic liquid crystals.

    PubMed

    Shen, Ming; Li, Wei; Lee, Ray-Kuang

    2016-04-18

    We reveal a controllable manipulation of anomalous interactions between Airy beams in nonlocal nematic liquid crystals numerically. With the help of an in-phase fundamental Gaussian beam, attraction between in-phase Airy beams can be suppressed or become a repulsive one to each other; whereas the attraction can be strengthened when the Gaussian beam is out-of-phase. In contrast to the repulsive interaction in local media, stationary bound states of breathing Airy soliton pairs are found in nematic liquid crystals. PMID:27137288

  19. Mineralogical and geochemical consequences of the long-term presence of CO2 in natural reservoirs: An example from the Springerville-St. Johns Field, Arizona, and New Mexico, U.S.A

    USGS Publications Warehouse

    Moore, J.; Adams, M.; Allis, R.; Lutz, S.; Rauzi, S.

    2005-01-01

    The Springerville-St. Johns CO2 field in eastern Arizona and western New Mexico is one of more than a dozen gas fields developed within the Colorado Plateau and Southern Rocky Mountain region. Extensive travertine (CaCO3) deposits record a long history of CO2 migration and leakage to the atmosphere. The oldest travertine deposits may have formed during the initial filling of the CO2 reservoir when groundwaters exsolved CO2 upon reaching the surface. The youngest travertine deposits are associated with springs on the floor of the Little Colorado River valley, but travertine deposition appears to be insignificant today. Older deposits occur up to 325 m above the valley floor. Geologic relationships suggest travertine deposition began in the late Pleistocene after volcanic activity ended at ???0.3 Ma. Most of the CaCO3 could have been derived from dissolution of the underlying limestones and dolomites. Interactions between the reservoir fluids and rocks were observed in core samples from one of the intervals that produced dry gas. These reactions resulted in the dissolution of carbonate cements and detrital feldspars and the formation of dawsonite and kaolinite. Geochemical simulations suggest that the dawsonite could have been deposited when the CO2 fugacity reached 20 bars and that the kaolinite formed as the CO2 fugacity decreased. Corrosion of drill pipe by acidic waters and a pronounced HCO3 anomaly above the CO2 reservoir provide evidence of a continuing flux of CO2 from depth. CO2 storage occurs primarily as dissolved carbonate species and as gas accumulations. Only a small percentage of the CO2 was sequestered in secondary minerals. ?? 2005 Elsevier B.V. All rights reserved.

  20. 1. Historic American Buildings Survey John O. Brostrup, Photographer September ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Historic American Buildings Survey John O. Brostrup, Photographer September 17, 1936 10:45 A. M. VIEW OF 1315 4th St., S. W., FROM NORTHEAST (front) - Wheat Row, 1315 Fourth Street Southwest, Washington, District of Columbia, DC

  1. Numerical evaluation of the incomplete airy functions and their application to high frequency scattering and diffraction

    NASA Technical Reports Server (NTRS)

    Constantinides, E. D.; Marhefka, R. J.

    1992-01-01

    The incomplete Airy integrals serve as canonical functions for the uniform ray optical solutions to several high frequency scattering and diffraction problems that involve a class of integrals characterized by two stationary points that are arbitrarily close to one another or to an integration endpoint. Integrals of such analytical properties describe transition region phenomena associated with composite shadow boundaries. An efficient and accurate method for computing the incomplete Airy functions would make the solutions to such problems useful for engineering purposes. Here, a convergent series solution form for the incomplete Airy functions is derived. Asymptotic expansions involving several terms were also developed and serve as large argument approximations. The combination of the series solution form with the asymptotic formulae provides for an efficient and accurate computation of the incomplete Airy functions. Validation of accuracy is accomplished using direct numerical integration data.

  2. AIRY: a complete tool for the simulation and the reconstruction of astronomical images

    NASA Astrophysics Data System (ADS)

    La Camera, Andrea; Carbillet, Marcel; Olivieri, Chiara; Boccacci, Patrizia; Bertero, Mario

    2012-07-01

    The Software Package AIRY (acronym for Astronomical Image Restoration in interferometrY) is a software tool designed to perform simulation and/or deconvolution of images of Fizeau interferometers as well as of any kind of optical telescopes. AIRY is written in IDL and is a Software Package of the CADS Problem Solving Environment (PSE): it is made of a set of modules, each one representing a specific task. We present here the last version of the software, arrived at its sixth release after 10 years of development. This version of AIRY summarizes the work done in recent years by our group, both on AIRY and on AIRY-LN, the version of the software dedicated to the image restoration of LINC-NIRVANA (LN), the Fizeau interferometer of the Large Binocular Telescope (LBT). AIRY v.6.0 includes a renewed deconvolution module implementing regularizations, accelerations, and stopping criteria of standard algorithms, such as OSEM and Richardson-Lucy. Several modules of AIRY have been improved and, in particular, the one used for the extraction and extrapolatioThe Software Package AIRY (acronym for Astronomical Image Restoration in interferometrY) is a software tool designed to perform simulation and/or deconvolution of images of Fizeau interferometers as well as of any kind of optical telescopes. AIRY is written in IDL and is a Software Package of the CAOS Problem Solving Environment (PSE): it is made of a set of modules, each one representing a speci_c task. We present here the last version of the software, arrived at its sixth release after 10 years of development. This version of AIRY summarizes the work done in recent years by our group, both on AIRY and on AIRY-LN, the version of the software dedicated to the image restoration of LINC-NIRVANA (LN), the Fizeau interferometer of the Large Binocular Telescope (LBT). AIRY v.6.0 includes a renewed deconvolution module implementing regularizations, accelerations, and stopping criteria of standard algorithms, such as OSEM and

  3. Quantitative comparison of self-healing ability between Bessel–Gaussian beam and Airy beam

    SciTech Connect

    Wen, Wei; Chu, Xiuxiang

    2015-09-15

    The self-healing ability during propagation process is one of the most important properties of non-diffracting beams. This ability has crucial advantages to light sheet-based microscopy to reduce scattering artefacts, increase the quality of the image and enhance the resolution of microscopy. Based on similarity between two infinite-dimensional complex vectors in Hilbert space, the ability to a Bessel–Gaussian beam and an Airy beam have been studied and compared. Comparing the evolution of the similarity of Bessel–Gaussian beam with Airy beam under the same conditions, we find that Bessel–Gaussian beam has stronger self-healing ability and is more stable than that of Airy beam. To confirm this result, the intensity profiles of Bessel–Gaussian beam and Airy beam with different similarities are numerically calculated and compared.

  4. Guiding ultraslow weak-light bullets with Airy beams in a coherent atomic system

    NASA Astrophysics Data System (ADS)

    Hang, Chao; Huang, Guoxiang

    2014-01-01

    We investigate the possibility of guiding stable ultraslow weak-light bullets by using Airy beams in a cold, lifetime-broadened four-level atomic system via electromagnetically induced transparency (EIT). We show that under EIT condition the light bullet with ultraslow propagating velocity and extremely low generation power formed by the balance between diffraction and nonlinearity in the probe field can be not only stabilized but also steered by the assisted field. In particular, when the assisted field is taken to be an Airy beam, the light bullet can be trapped into the main lobe of the Airy beam, propagate ultraslowly in longitudinal direction, accelerate in transverse directions, and move along a parabolic trajectory. We further show that the light bullet can bypass an obstacle when guided by two sequential Airy beams. A technique for generating ultraslow helical weak-light bullets is also proposed.

  5. Propagation of Airy-Gaussian beams in a chiral medium

    NASA Astrophysics Data System (ADS)

    Deng, Fu; Yu, Weihao; Huang, Jiayao; Zhao, Ruihuang; Lin, Jiong; Deng, Dongmei

    2016-04-01

    We have expressed and investigated the propagation of Airy-Gaussian beams (AiGBs) in a chiral medium analytically. It is shown that AiGBs split into two components, i.e., the left circularly polarized (LCP) beams and the right circularly polarized (RCP) beams, which have a different propagation trajectory and are affected by the chiral parameter γ and the distribution factor χ0. It is found that the LCP beams accelerate faster than the RCP beams during propagation, and are influenced by the chiral parameter. With an increase in the chiral parameter, the acceleration of the LCP beams increases, but that of the RCP beams decreases. So, it is significant that we can control the self-acceleration of AiGBs by varying the chiral parameter and the distribution factor.

  6. Interaction of Airy-Gaussian beams in Kerr media

    NASA Astrophysics Data System (ADS)

    Peng, Yulian; Peng, Xi; Chen, Bo; Zhou, Meiling; Chen, Chidao; Deng, Dongmei

    2016-01-01

    We study the interaction of the Airy-Gaussian (AiG) beams by using the numerical simulations with the split-step Fourier method. The results show that the single breathers and breather pairs can be formed in the condition with interaction. The breathers can be formed with the enough intensity of interactive beams. By adjusting the parameters of amplitude, interval, phase and χ0, we find that the interaction of the two beams is the strongest with in-phase and out-of-phase cases, especially in the shorter distance. Moreover, both the interaction intensity and the location, the interaction happens, can be changed by adjusting the distribution factor χ0 of the beams. It is notable that the various propagation directions of the beams can be obtained by changing the phase, at the same situation, when the interval of the two beams becomes narrower, the phase plays an important role of controlling the direction of the accelerated spot.

  7. Polarization-controllable Airy beams generated via a photoaligned director-variant liquid crystal mask.

    PubMed

    Wei, Bing-Yan; Chen, Peng; Hu, Wei; Ji, Wei; Zheng, Li-Yang; Ge, Shi-Jun; Ming, Yang; Chigrinov, Vladimir; Lu, Yan-Qing

    2015-01-01

    Researches on Airy beams have grown explosively since the first demonstration in 2007 due to the distinguishing properties of nondiffraction, transverse acceleration and self-healing. To date, a simple and compact approach for generating Airy beams in high quality and efficiency has remained challenging. Here, we propose and demonstrate a liquid crystal (LC) polarization Airy mask (PAM) featured by spatially variant LC azimuthal director. The PAM is fabricated through photoaligning LC via a polarization-sensitive alignment agent suophonic azo dye SD1. Thanks to the special design, a novel feature of polarization-controllable switch between dual Airy beams of orthogonal circular polarization is presented. The molecular-level continuity of LC director significantly improves the quality and efficiency of resultant Airy beams. Besides, the PAM can handle intense light due to the absence of absorptive electrodes. Additional merits of compact size, low cost and broad wavelength tolerance are also exhibited. This work settles a fundamental requirement for Airy beam applications of optical manipulations, biology science and even some uncharted territories. PMID:26626737

  8. Polarization-controllable Airy beams generated via a photoaligned director-variant liquid crystal mask

    PubMed Central

    Wei, Bing-Yan; Chen, Peng; Hu, Wei; Ji, Wei; Zheng, Li-Yang; Ge, Shi-Jun; Ming, Yang; Chigrinov, Vladimir; Lu, Yan-Qing

    2015-01-01

    Researches on Airy beams have grown explosively since the first demonstration in 2007 due to the distinguishing properties of nondiffraction, transverse acceleration and self-healing. To date, a simple and compact approach for generating Airy beams in high quality and efficiency has remained challenging. Here, we propose and demonstrate a liquid crystal (LC) polarization Airy mask (PAM) featured by spatially variant LC azimuthal director. The PAM is fabricated through photoaligning LC via a polarization-sensitive alignment agent suophonic azo dye SD1. Thanks to the special design, a novel feature of polarization-controllable switch between dual Airy beams of orthogonal circular polarization is presented. The molecular-level continuity of LC director significantly improves the quality and efficiency of resultant Airy beams. Besides, the PAM can handle intense light due to the absence of absorptive electrodes. Additional merits of compact size, low cost and broad wavelength tolerance are also exhibited. This work settles a fundamental requirement for Airy beam applications of optical manipulations, biology science and even some uncharted territories. PMID:26626737

  9. Polarization-controllable Airy beams generated via a photoaligned director-variant liquid crystal mask

    NASA Astrophysics Data System (ADS)

    Wei, Bing-Yan; Chen, Peng; Hu, Wei; Ji, Wei; Zheng, Li-Yang; Ge, Shi-Jun; Ming, Yang; Chigrinov, Vladimir; Lu, Yan-Qing

    2015-12-01

    Researches on Airy beams have grown explosively since the first demonstration in 2007 due to the distinguishing properties of nondiffraction, transverse acceleration and self-healing. To date, a simple and compact approach for generating Airy beams in high quality and efficiency has remained challenging. Here, we propose and demonstrate a liquid crystal (LC) polarization Airy mask (PAM) featured by spatially variant LC azimuthal director. The PAM is fabricated through photoaligning LC via a polarization-sensitive alignment agent suophonic azo dye SD1. Thanks to the special design, a novel feature of polarization-controllable switch between dual Airy beams of orthogonal circular polarization is presented. The molecular-level continuity of LC director significantly improves the quality and efficiency of resultant Airy beams. Besides, the PAM can handle intense light due to the absence of absorptive electrodes. Additional merits of compact size, low cost and broad wavelength tolerance are also exhibited. This work settles a fundamental requirement for Airy beam applications of optical manipulations, biology science and even some uncharted territories.

  10. Enhanced and unusual angle-dependent optical forces exerted on Mie particles by Airy surface plasmon wave

    NASA Astrophysics Data System (ADS)

    Yang, Yang; Xue, Yanli; Li, Jiafang; Li, Zhi-Yuan

    2016-08-01

    In this paper, using an angular spectrum method, we develop an analytical theory for Airy surface plasmon wave excited in a classical Kretschmann setup. It is found that the center of an Airy surface plasmon polariton (SPP) wave has a giant positive lateral shift, and the sidelobes move forward along the surface. The intensity of the Airy SPP wave is greatly enhanced, the corresponding optical forces can be enhanced by more than one order of magnitude. Importantly, we show that the sidelobes of the Airy SPP beam can lead to the splitting of optical force spectra with the variation of incident angle, which is accompanied by strong oscillations emerging at the optimal metal layer thickness. Moreover, the effects of multiple scatterings of the Airy SPP wave between the particle and the metal layer are also discussed. The theoretical analysis could open up new perspectives for the applications of Airy beam in optical manipulation and surface-enhanced Raman scattering.

  11. Petrographic and porosimetric study of opuka stones from different construction phases of the medieval Church of the Beheading of St. John the Baptist in Dolní Chabry (Prague, Czech Republic)

    NASA Astrophysics Data System (ADS)

    Sidova, Katerina; Prikryl, Richard; Weishauptova, Zuzana; Racek, Martin

    2015-04-01

    Opuka as a very fine-grained sedimentary rock deposited during Upper Cretaceous in relatively shallow (hemipelagic) marine conditions in the Bohemian Cretaceous Basin (Czech Republic) represents type of natural stone that has been widely exploited and used for construction from about 9th c. AD. Romanesque churches in Prague and central Bohemia are among the first preserved structures for which the opuka has been used. Question whether very local or more distant sources have been employed represents still unsolved matter. In the recent study, we focus on the detailed analysis of specimens of opuka taken from the Church of the Beheading of St. John the Baptist in Dolní Chabry (Prague). During the previous archaeological survey of the recent church (dated to 12th c. AD), remnants (basements constructed of opuka stone) of three older churches have recognized. The aim of recent material study is recognition of similarities or differences between opuka stones coming from these different construction phases and answering a question, whether material from a single source or from different localities has been employed. The study is based on the detailed petrographic examination using four sets of techniques: (1) microscopic observation (basic optical microscopy supplemented with the electron microscopy with microanalysis and X-ray elemental mapping), (2) X-ray diffraction of insoluble residue (composition of clay fraction and detection of some less organized silica forms), (3) chemical analysis and computation of modal composition by using normative minerals based on known mineralogical composition (input from microscopy and XRD), (4) study of physical properties, specifically by means of mercury porosimetry to quantify complex pore space of these rocks. Based on the results, three basic sets of specimens have been distinguished: (1) opuka stone with low content of carbonates (22-26 wt. %) and with higher content of kaolinite and illite (both WCI and PCI), (2) opuka stone

  12. 5. John N. Vogel, Photographer, June 2000 View to northeast. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. John N. Vogel, Photographer, June 2000 View to northeast. West end (up river), north sid guard (dewatering) gate. Northwest operating shelter to right center. Northwest intermediate shelter to right. - St. Mary's Falls Canal, Soo Locks, Sabin Lock Subcomplex, Sabin Lock, St. Mary's River at Falls, Sault Ste. Marie, Chippewa County, MI

  13. John Glenn - Mini Biography

    NASA Technical Reports Server (NTRS)

    1963-01-01

    Mini Biography of John Glenn, as it was up to 1962. From film to tape transfer of the film 'Friendship 7 - John Glenn' Depicts the historical orbital flight of John Glenn aboard 'Friendship 7', launched on February 20, 1962. Footage of staff at tracking stations worldwide and at Goddard Space Flight Center. Launch from cape canaveral. Flight tracking, re-entry, landing and recovery of Friendship 7.

  14. Evolution of the ring Airy Gaussian beams with a spiral phase in the Kerr medium

    NASA Astrophysics Data System (ADS)

    Chen, Bo; Chen, Chidao; Peng, Xi; Peng, Yulian; Zhou, Meiling; Deng, Dongmei; Guo, Hong

    2016-05-01

    Nonlinear optical phenomena are of great practical interest in optics. The evolution of ring Airy Gaussian beams with a spiral phase in the nonlinear Kerr medium is investigated using the nonlinear Schrödinger equation. Numerical simulations indicate that the distribution factor b can influence the formation of the ring Airy Gaussian beams. Results show that the beams can be oscillating, and the light filament can be achieved under appropriate laser input power. On the other hand, the evolution of the ring Airy Gaussian beams with a spiral phase in the nonlinear Kerr medium can be implemented, and the numerical simulations of the holographic generation of the ring Airy Gaussian vortex beams propagated in the medium demonstrate that the vortex can be preserved along the propagation. The Poynting vector shows that the energy flow of the ring Airy Gaussian beams flows in the opposite direction on both sides of the focus plane; however, for beams with a spiral phase, the flow direction remains the same; the energy flow can rotate in opposite directions on both sides of the focal plane.

  15. John Glenn: Friendship 7 Splashdown

    NASA Technical Reports Server (NTRS)

    1963-01-01

    Splasdown of Freindship 7 From: The John Glenn Story: Summary of astronaut John Glenn's flying career, from naval aviation training to space flight. The Mercury project is featured as John Glenn flies the Friendship 7 spacecraft. President John F. Kennedy presents the NASA Distinguished service Medal to Astronaut John Glenn.

  16. Lossless Airy Surface Polaritons in a Metamaterial via Active Raman Gain

    NASA Astrophysics Data System (ADS)

    Zhang, Qi; Tan, Chaohua; Huang, Guoxiang

    2016-02-01

    We propose a scheme to realize a lossless propagation of linear and nonlinear Airy surface polaritons (SPs) via active Raman gain (ARG). The system we suggest is a planar interface superposed by a negative index metamaterial (NIMM) and a dielectric, where three-level quantum emitters are doped. By using the ARG from the quantum emitters and the destructive interference effect between the electric and magnetic responses from the NIMM, we show that not only the Ohmic loss of the NIMM but also the light absorption of the quantum emitters can be completely eliminated. As a result, non-diffractive Airy SPs may propagate for very long distance without attenuation. We also show that the Kerr nonlinearity of the system can be largely enhanced due to the introduction of the quantum emitters and hence lossless Airy surface polaritonic solitons with very low power can be generated in the system.

  17. Lossless Airy Surface Polaritons in a Metamaterial via Active Raman Gain.

    PubMed

    Zhang, Qi; Tan, Chaohua; Huang, Guoxiang

    2016-01-01

    We propose a scheme to realize a lossless propagation of linear and nonlinear Airy surface polaritons (SPs) via active Raman gain (ARG). The system we suggest is a planar interface superposed by a negative index metamaterial (NIMM) and a dielectric, where three-level quantum emitters are doped. By using the ARG from the quantum emitters and the destructive interference effect between the electric and magnetic responses from the NIMM, we show that not only the Ohmic loss of the NIMM but also the light absorption of the quantum emitters can be completely eliminated. As a result, non-diffractive Airy SPs may propagate for very long distance without attenuation. We also show that the Kerr nonlinearity of the system can be largely enhanced due to the introduction of the quantum emitters and hence lossless Airy surface polaritonic solitons with very low power can be generated in the system. PMID:26891795

  18. Lossless Airy Surface Polaritons in a Metamaterial via Active Raman Gain

    PubMed Central

    Zhang, Qi; Tan, Chaohua; Huang, Guoxiang

    2016-01-01

    We propose a scheme to realize a lossless propagation of linear and nonlinear Airy surface polaritons (SPs) via active Raman gain (ARG). The system we suggest is a planar interface superposed by a negative index metamaterial (NIMM) and a dielectric, where three-level quantum emitters are doped. By using the ARG from the quantum emitters and the destructive interference effect between the electric and magnetic responses from the NIMM, we show that not only the Ohmic loss of the NIMM but also the light absorption of the quantum emitters can be completely eliminated. As a result, non-diffractive Airy SPs may propagate for very long distance without attenuation. We also show that the Kerr nonlinearity of the system can be largely enhanced due to the introduction of the quantum emitters and hence lossless Airy surface polaritonic solitons with very low power can be generated in the system. PMID:26891795

  19. The Unretiring John Krumboltz

    ERIC Educational Resources Information Center

    LaFromboise, Teresa D.; Neumann, Harly

    2002-01-01

    John D. Krumboltz continues to contribute to the field of counseling psychology, including the subspecialty of career counseling, after five decades of professional experience. Inspired by B. F. Skinner, John operationalized a behavioral approach to counseling. After 4 years at Michigan State University, where he initiated research on programmed…

  20. Jasper Johns' Painted Words.

    ERIC Educational Resources Information Center

    Levinger, Esther

    1989-01-01

    States that the painted words in Jasper Johns' art act in two different capacities: concealed words partake in the artist's interrogation of visual perception; and visible painted words question classical representation. Argues that words are Johns' means of critiquing modernism. (RS)

  1. John Dewey, an Appreciation

    ERIC Educational Resources Information Center

    Clopton, Robert W.

    2015-01-01

    The subject of the annual Presidential address of Phi Kappa Phi, presented on May 8, 1962, was John Dewey. Dewey is identified in the public mind chiefly as an educational philosopher. In this address, the author describes the life and work of John Dewey as an indefatigable student of life whose interests ranged, like those of Aristotle, over the…

  2. Arrays of Gaussian vortex, Bessel and Airy beams by computer-generated hologram

    NASA Astrophysics Data System (ADS)

    Lu, Yang; Jiang, Bo; Lü, Shuchao; Liu, Yongqi; Li, Shasha; Cao, Zheng; Qi, Xinyuan

    2016-03-01

    We generate various kinds of arrays of Gaussian vortex, Bessel and Airy beams, respectively, with digital phase holograms (DPH) based on the fractional-Talbot effect by using the phase-only spatial light modulator (SLM). The linear and nonlinear transmissions of these beam arrays in strontium barium niobate (SBN) crystal are investigated numerically and experimentally. Compared with Gaussian vortex arrays, Bessel and Airy beam arrays can keep their patterns unchanged in over 20 mm, realizing non-diffracting transmission. The Fourier spectra (far-field diffraction patterns) of the lattices are also studied. The experimental results are in good agreement with the numerical simulations.

  3. Analysis of optical trapping and propulsion of Rayleigh particles using Airy beam.

    PubMed

    Cheng, Hua; Zang, Weiping; Zhou, Wenyuan; Tian, Jianguo

    2010-09-13

    The radiation forces and trajectories of Rayleigh dielectric particles induced by one-dimensional Airy beam were numerically analyzed. Results show that the Airy beam drags particles into the optical intensity peaks, and guides particles vertically along parabolic trajectories. Viscosity of surrounding medium significantly affects the trajectories. Random Brownian force affects the trajectories. Meanwhile, trapping potential depths and minimum trapping particle radii in different potential wells were also discussed. The trapping stability could be improved by increasing either the input peak intensity or the particle radius. PMID:20940930

  4. Bose-Einstein condensation of {alpha} particles and Airy structure in nuclear rainbow scattering

    SciTech Connect

    Ohkubo, S.; Hirabayashi, Y.

    2004-10-01

    It is shown that the dilute density distribution of {alpha} particles in nuclei can be observed in the Airy structure in nuclear rainbow scattering. We have analyzed {alpha}+{sup 12}C rainbow scattering to the 0{sub 2}{sup +} (7.65 MeV) state of {sup 12}C in a coupled-channel method with the precise wave functions for {sup 12}C. It is found that the enhanced Airy oscillations in the experimental angular distributions for the 0{sub 2}{sup +} state is caused by the dilute density distribution of this state in agreement for the idea of Bose-Einstein condensation of the three alpha particles.

  5. John Glenn OK

    NASA Technical Reports Server (NTRS)

    1962-01-01

    Astronaut John Glenn and technicians inspect artwork that will be painted on the outside of his Mercury spacecraft. John Glenn nicknamed his capsule 'Friendship 7'. On February 20, 1962 astronaut John H. Glenn Jr. lifted off into space aboard his Mercury Atlas (MA-6) rocket and became the first American to orbit the Earth. After orbiting the Earth 3 times, Friendship 7 landed in the Atlantic Ocean 4 hours, 55 minutes and 23 seconds later, just East of Grand Turk Island in the Bahamas. Glenn and his capsule were recovered by the Navy Destroyer Noa, 21 minutes after splashdown.

  6. Astronaut John Young's Career

    NASA Video Gallery

    John Young served as a NASA astronaut for over four decades, flying on Gemini, Apollo and the Space Shuttle. He walked on the moon during Apollo 16 in 1972 and commanded the first shuttle mission, ...

  7. John Henry: Then and Now.

    ERIC Educational Resources Information Center

    Nikola-Lisa, W.

    1998-01-01

    Compares three children's books retelling the legend of John Henry: "John Henry: An American Legend" by Ezra Jack Keats (1965), "John Henry" by Julius Lester (1994), and "The Legend of John Henry" by Terry Small (1994). Differences in imagery, language, symbolism, and themes are discussed. (MAK)

  8. Anomalous change of Airy disk with changing size of spherical particles

    NASA Astrophysics Data System (ADS)

    Pan, Linchao; Zhang, Fugen; Meng, Rui; Xu, Jie; Zuo, Chenze; Ge, Baozhen

    2016-02-01

    Use of laser diffraction is considered as a method of reliable principle and mature technique in measurements of particle size distributions. It is generally accepted that for a certain relative refractive index, the size of the scattering pattern (also called Airy disk) of spherical particles monotonically decreases with increasing particle size. This fine structure forms the foundation of the laser diffraction method. Here we show that the Airy disk size of non-absorbing spherical particles becomes larger with increasing particle size in certain size ranges. To learn more about this anomalous change of Airy disk (ACAD), we present images of Airy disk and curves of Airy disk size versus particle size for spherical particles of different relative refractive indices by using Mie theory. These figures reveal that ACAD occurs periodically for non-absorbing particles and will disappear when the absorbing efficiency is higher than certain value. Then by using geometrical optics (GO) approximation, we derive the analytical formulae for the bounds of the size ranges where ACAD occurs. From the formulae, we obtain laws of ACAD as follows: (1) for non-absorbing particles, ACAD occurs periodically, and when the particle size tends to infinity, the period tends to a certain value. As the relative refractive index increases, (2) the particle size ranges where ACAD occurs shift to smaller values, (3) the period of ACAD becomes smaller, and (4) the width of the size ranges where ACAD occurs becomes narrower. In addition, we can predict from the formulae that ACAD also exists for particles whose relative refractive index is smaller than 1.

  9. Commemorating John Dyson

    NASA Astrophysics Data System (ADS)

    Pittard, Julian M.

    2015-03-01

    John Dyson was born on the 7th January 1941 in Meltham Mills, West Yorkshire, England, and later grew up in Harrogate and Leeds. The proudest moment of John's early life was meeting Freddie Trueman, who became one of the greatest fast bowlers of English cricket. John used a state scholarship to study at Kings College London, after hearing a radio lecture by D. M. McKay. He received a first class BSc Special Honours Degree in Physics in 1962, and began a Ph.D. at the University of Manchester Department of Astronomy after being attracted to astronomy by an article of Zdenek Kopal in the semi-popular journal New Scientist. John soon started work with Franz Kahn, and studied the possibility that the broad emission lines seen from the Orion Nebula were due to flows driven by the photoevaporation of neutral globules embedded in a HII region. John's thesis was entitled ``The Age and Dynamics of the Orion Nebula`` and he passed his oral examination on 28th February 1966.

  10. A compact Airy beam light sheet microscope with a tilted cylindrical lens.

    PubMed

    Yang, Zhengyi; Prokopas, Martynas; Nylk, Jonathan; Coll-Lladó, Clara; Gunn-Moore, Frank J; Ferrier, David E K; Vettenburg, Tom; Dholakia, Kishan

    2014-10-01

    Light-sheet imaging is rapidly gaining importance for imaging intact biological specimens. Many of the latest innovations rely on the propagation-invariant Bessel or Airy beams to form an extended light sheet to provide high resolution across a large field of view. Shaping light to realize propagation-invariant beams often relies on complex programming of spatial light modulators or specialized, custom made, optical elements. Here we present a straightforward and low-cost modification to the traditional light-sheet setup, based on the open-access light-sheet microscope OpenSPIM, to achieve Airy light-sheet illumination. This brings wide field single-photon light-sheet imaging to a broader range of endusers. Fluorescent microspheres embedded in agarose and a zebrafish larva were imaged to demonstrate how such a microscope can have a minimal footprint and cost without compromising on imaging quality. PMID:25360362

  11. Wavelength estimation by using the Airy disk from a diffraction pattern with didactic purposes

    NASA Astrophysics Data System (ADS)

    Rivera-Ortega, Uriel; Pico-Gonzalez, Beatriz

    2016-01-01

    In this paper a simple and easy to implement method that uses the Airy disk generated from a Fraunhofer diffraction pattern due to a circular aperture will be used to estimate the wavelength of the illuminating laser source. This estimation is based on the measurement of the Airy disk diameter, whose approximation is directly proportional to the wavelength of the light source and to the distance between the aperture and the image plane; and inversely proportional to the diameter of the aperture. Due to the characteristics and versatility of the present proposal, this is perfectly suitable for use in graduate or undergraduate physics laboratories, or even in classrooms for educational and/or demonstrative purposes.

  12. A compact Airy beam light sheet microscope with a tilted cylindrical lens

    PubMed Central

    Yang, Zhengyi; Prokopas, Martynas; Nylk, Jonathan; Coll-Lladó, Clara; Gunn-Moore, Frank J.; Ferrier, David E. K.; Vettenburg, Tom; Dholakia, Kishan

    2014-01-01

    Light-sheet imaging is rapidly gaining importance for imaging intact biological specimens. Many of the latest innovations rely on the propagation-invariant Bessel or Airy beams to form an extended light sheet to provide high resolution across a large field of view. Shaping light to realize propagation-invariant beams often relies on complex programming of spatial light modulators or specialized, custom made, optical elements. Here we present a straightforward and low-cost modification to the traditional light-sheet setup, based on the open-access light-sheet microscope OpenSPIM, to achieve Airy light-sheet illumination. This brings wide field single-photon light-sheet imaging to a broader range of endusers. Fluorescent microspheres embedded in agarose and a zebrafish larva were imaged to demonstrate how such a microscope can have a minimal footprint and cost without compromising on imaging quality. PMID:25360362

  13. Nonlinear dynamics of Airy-vortex 3D wave packets: emission of vortex light waves.

    PubMed

    Driben, Rodislav; Meier, Torsten

    2014-10-01

    The dynamics of 3D Airy-vortex wave packets is studied under the action of strong self-focusing Kerr nonlinearity. Emissions of nonlinear 3D waves out of the main wave packets with the topological charges were demonstrated. Because of the conservation of the total angular momentum, charges of the emitted waves are equal to those carried by the parental light structure. The rapid collapse imposes a severe limitation on the propagation of multidimensional waves in Kerr media. However, the structure of the Airy beam carrier allows the coupling of light from the leading, most intense peak into neighboring peaks and consequently strongly postpones the collapse. The dependence of the critical input amplitude for the appearance of a fast collapse on the beam width is studied for wave packets with zero and nonzero topological charges. Wave packets carrying angular momentum are found to be much more resistant to the rapid collapse. PMID:25360922

  14. Astronaut John H. Glenn

    NASA Technical Reports Server (NTRS)

    1959-01-01

    Astronaut John H. Glenn, one of the original seven astronauts for Mercury Project selected by NASA on April 27, 1959. The MA-6 mission, boosted by the Mercury-Atlas vehicle, was the first manned orbital launch by the United States, and carried Astronaut Glenn aboard the Friendship 7 spacecraft to orbit the Earth.

  15. Dedication: John Reuben Clark.

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Volume 40 of Horticultural reviews is dedicated to John Reuben Clark (University of Arkansas) for his outstanding contributions to horticulture. While known particularly for his impact on blackberry, blueberry, table grape, and peach cultivar development, he has also been a strong and enthusiastic v...

  16. John Galen Howard.

    ERIC Educational Resources Information Center

    Draper, Joan

    1979-01-01

    A biographical sketch of John Galen Howard, founder of the Department of Architecture at the University of California at Berkeley, is presented. Howard's conservative outlook and idealistic nature are examined and his influence on the curriculum at the university is traced. (PHR)

  17. John C. Houbolt

    NASA Technical Reports Server (NTRS)

    1962-01-01

    John C. Houbolt at blackboard, showing his space rendezvous concept for lunar landings. Lunar Orbital Rendezvous (LOR) would be used in the Apollo program. Although Houbolt did not invent the idea of LOR, he was the person most responsible for pushing it at NASA.

  18. John Carroll University

    ERIC Educational Resources Information Center

    Dean, Kathleen Lis; Rombalski, Patrick; O'Dell, Kyle

    2009-01-01

    John Carroll University (JCU) is a Jesuit Catholic institution located in University Heights, approximately 10 miles east of Cleveland, Ohio. Founded in 1888, the university has a population of 3,400 undergraduates and 800 graduate students. The Division of Student Affairs at JCU comprises 11 units. The mission of the division is the same as that…

  19. The John Muir Award.

    ERIC Educational Resources Information Center

    White, Graham

    2002-01-01

    The John Muir Award was established in the United Kingdom to respond to minimal environmental awareness, especially among youth. The Award has three levels of effort; all involve discovering a wild place, exploring its wildness, helping to conserve it, and sharing the experience with a wider audience. There is an effort to establish the award in…

  20. John Cage Discusses Fluxus.

    ERIC Educational Resources Information Center

    Snyder, Ellsworth

    1992-01-01

    Presents an informal discussion with composer John Cage which includes his response to George Maciunas' work, his recollections of Marcel Duchamp, the complex relationship between inelegant material and revealing works of art, neo-Dada and neo-Fluxus, Wittgenstein and the artist's ultimate responsibility to initiate a change in the viewer or…

  1. Who Killed John Keats?

    ERIC Educational Resources Information Center

    Leal, Amy

    2007-01-01

    Two months before he died, John Keats claimed he had been poisoned. Although most scholars and biographers have attributed Keats's fears of persecution, betrayal, and murder to consumptive dementia, Keats's suspicions had begun long before 1820 and were not without some justification. In this article, the author talks about the death of John…

  2. John Glenn's Space Ride.

    ERIC Educational Resources Information Center

    Schamel, Wynell; Potter, Lee Ann

    1998-01-01

    Reviews the accomplishments of John Glenn as a pilot, astronaut, senator, and pioneer in relation to his 1998 flight that made him the oldest person to ever travel into space. Includes photographs for students to study, and recommends classroom activities related to Glenn's career. (DSK)

  3. Peter Pindar (John Wolcot).

    ERIC Educational Resources Information Center

    Vales, Robert L.

    This book is designed as an introduction to John Wolcot's works for the general reader, the college student, and the college teacher. Wolcot, whose pen name was Peter Pindar, wrote topical satire on public personalities of the eighteenth century, and his methods of criticism are the motif which guides each chapter and which unites all the satires…

  4. Dr. Airy's "morbid affection of the eyesight": lessons from Teichopsia Circa 1870.

    PubMed

    Lepore, Frederick E

    2014-09-01

    Hubert Airy's iconic drawing of his own migraine visual aura for which he coined the term, "teichopsia," conveys important lessons for the contemporary clinician. His observations of the expansion ("build-up"), minification/magnification, and color/achromatopsia of migrainous teichopsia are consistent with (and possibly anticipatory of) the later discoveries of cortical spreading depression, cortical magnification of primary visual cortex (V1), and specialized cortical centers for color vision. PMID:24840023

  5. Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

    SciTech Connect

    Fang, Zhao-Xiang; Gong, Lei; Ren, Yu-Xuan; Vaveliuk, Pablo; Chen, Yue; Lu, Rong-De

    2015-11-28

    Needle-like electromagnetic field has various advantages for the applications in high-resolution imaging, Raman spectroscopy, as well as long-distance optical transportation. The realization of such field often requires high numerical aperture (NA) objective lens and the transmission masks. We demonstrate an ultralong needle-like focus in the optical range produced with an ordinary lens. This is achieved by focusing a symmetric Airy beam (SAB) generated via binary spectral modulation with a digital micromirror device. Such amplitude modulation technique is able to shape traditional Airy beams, SABs, as well as the dynamic transition modes between the one-dimensional and two-dimensional (2D) symmetric Airy modes. The created 2D SAB was characterized through measurement of the propagating fields with one of the four main lobes blocked by an opaque mask. The 2D SAB was verified to exhibit self-healing property against propagation with the obstructed major lobe reconstructed after a certain distance. We further produced an elongated focal line by concentrating the SAB via lenses with different NAs and achieved an ultralong longitudinal needle focus. The produced long needle focus will be applied in optical, chemical, and biological sciences.

  6. 2. Historic American Buildings Survey Richard Koch, Photographer, April, 1934 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Historic American Buildings Survey Richard Koch, Photographer, April, 1934 SOUTHWEST ELEVATION - Angelina Plantation (Dove Cote & Doll House), State Highway 1, Mount Airy, St. John the Baptist Parish, LA

  7. 3. Historic American Buildings Survey Richard Koch, Photographer, April, 1934 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Historic American Buildings Survey Richard Koch, Photographer, April, 1934 SOUTHWEST ELEVATION - Angelina Plantation (Dove Cote & Doll House), State Highway 1, Mount Airy, St. John the Baptist Parish, LA

  8. 4. Historic American Buildings Survey Richard Koch, Photographer, Circa 1925 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Historic American Buildings Survey Richard Koch, Photographer, Circa 1925 FIREPLACE IN DOLL HOUSE - Angelina Plantation (Dove Cote & Doll House), State Highway 1, Mount Airy, St. John the Baptist Parish, LA

  9. 1. Historic American Buildings Survey Richard Koch, Photographer, Circa 1925 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Historic American Buildings Survey Richard Koch, Photographer, Circa 1925 DOVE COTE AND DOLL HOUSE - Angelina Plantation (Dove Cote & Doll House), State Highway 1, Mount Airy, St. John the Baptist Parish, LA

  10. 5. Historic American Buildings Survey Richard Koch, Photographer, March, 1934 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. Historic American Buildings Survey Richard Koch, Photographer, March, 1934 VIEW FROM NORTH WEST - Angelina Plantation (Dove Cote & Doll House), State Highway 1, Mount Airy, St. John the Baptist Parish, LA

  11. Obituary: John Louis Perdrix, 1926-2005

    NASA Astrophysics Data System (ADS)

    Orchiston, D. Wayne

    2006-12-01

    journals appeared under the banner of his own publishing house, Astral Press, until 2005 when JAH2 was transferred to the Centre of Astronomy at James Cook University. When cancer was first diagnosed, this did not deter John, and he continued to pursue his astronomical and editorial interests. Early in 2005 the cancer was in remission and John decided to make one final overseas trip, a long-anticipated visit to St. Petersburg. It was while he was returning to Australia that the illness aggressively reappeared, and he was taken off the airplane at Dubai and died peacefully in Rashid Hospital three days later. He was just three days short of his seventy-ninth birthday. Always the consummate gentleman, John Perdrix had a keen sense of humor and was wonderful company. He will be greatly missed by all who knew him. Our condolences go to his six children, Louise, John, Timothy, Fleur, Lisa and Angella.

  12. John Glenn: His first Flying Lesson Remembered

    NASA Technical Reports Server (NTRS)

    1971-01-01

    Pilot Harry Clever remembers giving John Glenn his first flying lesson. From: The John Glenn Story: Summary of astronaut John Glenn's flying career, from naval aviation training to space flight. The Mercury project is featured as John Glenn flies the Friendship 7 spacecraft. President John F. Kennedy presents the NASA Distinguished service Medal to Astronaught John Glenn.

  13. John McCain

    ERIC Educational Resources Information Center

    Phi Delta Kappan, 2008

    2008-01-01

    This article presents speeches describing John McCain's position on education posted on the McCain campaign's official web site, www.johnmccain.com. These include McCain's speech to LaRaza convention, July 14; McCain's speech to the NAACP, July 16; McCain's speech at the Greater Columbus (Ohio) Convention Center, May 15; and McCain's speech at…

  14. John Keats and tuberculosis.

    PubMed

    Radetsky, M

    2001-05-01

    John Keats was trained as an apothecary, the general practitioner of the day. Precocious in his sensibilities and fluent in his imagery, he also was the model of the romantic poet. That he was a physician and a poet makes his early death from tuberculosis poignant and revealing. This history traces his life and death against the backdrop of medicine at the turn of the 19th century. PMID:11368115

  15. Coherent mid-infrared supercontinuum generation with As2Se3 photonic crystal fiber and femtosecond Airy pulses

    NASA Astrophysics Data System (ADS)

    Yuan, Wu

    2015-12-01

    We discuss a novel method for generating hyper-broadband mid-infrared (MIR) supercontinua (SC) with coherent bandwidth from ~2 μm to ~10 μm by using As2Se3 photonic crystal fiber (PCF) and a 4.1 μm pump with femtosecond (fs) Airy pulse profile. Our simulations confirm that, when pumping in the normal dispersion region, the deceleration and self-healing properties of the Airy pulse can suppress the incoherent noise in modulational instability (MI) induced SC generation and maintain the pulse coherence over a long propagation distance. We also find that fs Airy pulse can generate an MIR SC with a broader coherent bandwidth than these can be achieved with fs parabolic secant pulse.

  16. Complex Airy analysis of photoreflectance spectra for III-V semiconductors

    NASA Astrophysics Data System (ADS)

    Estrera, J. P.; Duncan, W. M.; Glosser, R.

    1994-03-01

    We present a detailed analysis of photoreflectance (PR) spectra of semiconductors using complex Airy functions and their derivatives. We demonstrate that photoreflectance spectra can be treated in terms of a single complex Airy function with an energy-dependent broadening parameter. We show analytically and numerically that this complex Airy PR treatment is functionally equivalent within field conditions appropriate for PR to the model of R. N. Bhattacharya, H. Shen, P. Parayanthal, F. H. Pollak, T. Coutts, and A. Aharoni [Phys. Rev. B 37, 4044 (1988)], where the effects of gradient electric field and non-flat-band modulation are treated explicitly. The equivalence occurs because the field gradient and non-flat-band modulation effects are included in our model in the energy dependence of the phenomenological broadening parameter Γ*=(Γ0/ħθ)exp[δ(ħω-Eg)], where ħω is the photon energy, Eg is the band-gap energy, Γ0 is the nominal broadening at the band-gap energy, and δ is a parameter directly proportional to the electric-field gradient and modulation between two finite fields. The major utility of our model is that a single effective layer can be treated instead of a more computationally intensive laminar model. We apply our complex Airy model to bulk semiconductors such as GaAs, InP, and InxGa1-xAs. In the photoreflectance spectra of these semiconductors, our model considers three distinct but convolved features at E0 which represent the light- and heavy-hole valence bands and an exciton-impurity feature below E0. At E0+Δ0 our model considers two features which are related to the spin-orbit-split valence band and a second state just below this critical point. For GaAs, we determined from our PR modeling that the band-gap energy for these films was 1.422+/-0.003 eV, which agreed, within experimental error, with the band-gap energy measured by room-temperature photoluminescence. A feature was found below the E0 gap in the GaAs samples with energies

  17. John Campbell Begg

    NASA Astrophysics Data System (ADS)

    Campbell, Robert

    2002-03-01

    John Campbell Begg born in Dunedin in 1876 was the son of Alexander Campbell Begg and Katherine Begg, early Otago settlers. He studied physics and philosophy at the University of Otago before turning to business and rural pursuits. He died in Dunedin in 1965 age 89. The Begg family were foundation members of the Otago Astronomical Society. Visits to the Tanna Hill Observatory were made in 1915. The astronomical observatory which stands in Robin Hood Park, Roslyn, Dunedin bears his name; Beverly Begg Observatory

  18. VIEW SOUTHSOUTH CLINTON AVENUE BUILDING 35 CLINTON ST. WIRE MILL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW SOUTH-SOUTH CLINTON AVENUE BUILDING 35 CLINTON ST. WIRE MILL (1899) - John A. Roebling's Sons Company & American Steel & Wire Company, South Broad, Clark, Elmer, Mott & Hudson Streets, Trenton, Mercer County, NJ

  19. Airy Equation for the Topological String Partition Function in a Scaling Limit

    NASA Astrophysics Data System (ADS)

    Alim, Murad; Yau, Shing-Tung; Zhou, Jie

    2016-04-01

    We use the polynomial formulation of the holomorphic anomaly equations governing perturbative topological string theory to derive the free energies in a scaling limit to all orders in perturbation theory for any Calabi-Yau threefold. The partition function in this limit satisfies an Airy differential equation in a rescaled topological string coupling. One of the two solutions of this equation gives the perturbative expansion and the other solution provides geometric hints of the non-perturbative structure of topological string theory. Both solutions can be expanded naturally around strong coupling.

  20. Generation of χ(2) solitons from the Airy wave through the parametric instability.

    PubMed

    Mayteevarunyoo, Thawatchai; Malomed, Boris A

    2015-11-01

    Spontaneous creation of solitons in quadratic media by the downconversion (i.e., parametric instability against the generation of fundamental-frequency excitations) from the truncated Airy-wave (AW) mode in the second-harmonic component is studied. Parameter regions are identified for the generation of one, two, and three solitons, with additional small-amplitude "jets." Shares of the total power carried by individual solitons are found. Also considered are soliton patterns generated by the downconversion from a pair of AWs bending in opposite directions. PMID:26512490

  1. Two-dimensional χ^2 solitons generated by the downconversion of Airy waves

    NASA Astrophysics Data System (ADS)

    Mayteevarunyoo, Thawatchai; Malomed, Boris A.

    2016-07-01

    Conversion of truncated Airy waves (AWs) carried by the second-harmonic (SH) component into axisymmetric $\\chi^{2}$ solitons is considered in the 2D system with the quadratic nonlinearity. The spontaneous conversion is driven by the parametric instability of the SH wave. The input in the form of the AW vortex is considered too. As a result, one, two, or three stable solitons emerge in a well-defined form, unlike the recently studied 1D setting, where the picture is obscured by radiation jets. Shares of the total power captured by the emerging solitons and conversion efficiency are found as functions of parameters of the AW input.

  2. Airy Equation for the Topological String Partition Function in a Scaling Limit

    NASA Astrophysics Data System (ADS)

    Alim, Murad; Yau, Shing-Tung; Zhou, Jie

    2016-06-01

    We use the polynomial formulation of the holomorphic anomaly equations governing perturbative topological string theory to derive the free energies in a scaling limit to all orders in perturbation theory for any Calabi-Yau threefold. The partition function in this limit satisfies an Airy differential equation in a rescaled topological string coupling. One of the two solutions of this equation gives the perturbative expansion and the other solution provides geometric hints of the non-perturbative structure of topological string theory. Both solutions can be expanded naturally around strong coupling.

  3. Test drilling and aquifer test in the Marburg schist near Mount Airy, Frederick County, Maryland

    USGS Publications Warehouse

    Meyer, Gerald

    1955-01-01

    This memorandum summarizes briefly the data obtained by test drilling and in an aquifer test at Mount Airy, Md. The tests were a part of the State - Federal cooperative study of the ground-water resources of Frederick County, and it is intended that a more complete analysis of the test data will be included in a future report describing the ground-water resource of Frederick County. The purpose of this memorandum is to make the test data immediately available to the general public. Mount Airy is located along the Carroll-Frederick County boundary bout 2 miles north of the intersection of U.S. Highway 40 with the county boundary. Its population is approximately 1,000. The municipal well field, consisting of two drilled wells (fig. 1) is in a valley about one-half mile west of the center of Mount Airy, within about 400 feet of a small stream, and north of Prospect Road. Well 1, about 40 feet north of Prospect Road, is 125 feet deep, 8 inches in diameter, and reportedly yielded 265 gallons per minute (gpm) in 1947 and 201 gpm in a half hour test in March 1955. The writer determined during the tests described in this memorandum that the well has about 34 feet of casing. Well 2, 85 feet north of well 1, is 96 feet deep, 8 inches in diameter, and reportedly yielded 120 gpm in 1947 and 127 gpm in a half hour test in March 1955. The wells are equipped with deep-well turbine pumps powered by electric motors. Cenorally only well 1 is used, and it is pumped for only a few short intervals each day to meet the water requirements of the town (about 75,000 - 80,000 gallons daily). The reported yields of these wells are considerably higher than the average for crystalline-rock wells in the Piedmont of Maryland. The test drilling was done under contract with Edward I. Brown, well driller, between May 3 and May 12, 1955. Water-supply facilities of the town of Mount Airy were kindly made available for the aquifer tests from May 22 to May 30, 1955. The pumping tests consisted of a

  4. Two-dimensional χ2 solitons generated by the downconversion of Airy waves.

    PubMed

    Mayteevarunyoo, Thawatchai; Malomed, Boris A

    2016-07-01

    Conversion of truncated Airy waves (AWs) carried by the second-harmonic (SH) component into axisymmetric χ2 solitons is considered in a 2D system with quadratic nonlinearity. The spontaneous conversion is driven by the parametric instability of the SH wave. The input in the form of the AW vortex is also considered. As a result, one, two, or three stable solitons emerge in a well-defined form, unlike the recently studied 1D setting, where the picture is obscured by radiation jets. Shares of the total power captured by the emerging solitons and conversion efficiency are found as functions of parameters of the AW input. PMID:27367065

  5. Bound states of breathing Airy-Gaussian beams in nonlocal nonlinear medium

    NASA Astrophysics Data System (ADS)

    Zhang, Xiaping

    2016-05-01

    With a nonlocal model, we investigate the propagation dynamics of a single Airy-Gaussian (AiG) beam and their interaction in one-dimensional condition by means of direct numerical simulations. With the split-step Fourier method, numerical results shows that nonlocality can support periodic intensity distribution of AiG beams leading to the formation of stable bound states. Especially, by tuning the phase difference between the two beams, we can steer the center of the bound AiG beams in nonlocal nonlinear media.

  6. Diffraction by three-dimensional slit-shape curves: decomposition in terms of Airy and Pearcey functions.

    PubMed

    Martinez-Vara, P; Barranco, J Silva; De Los Santos G, S I; Munoz-Lopez, J; Torres-Rodriguez, M A; Xique, R Suarez; Martinez-Niconoff, G

    2015-08-01

    We analyze the diffraction field generated by coherent illumination of a three-dimensional transmittance characterized by a slit-shape curve. Generic features are obtained using the Frenet-Serret equations, which allow a decomposition of the optical field. The analysis is performed by describing the influence of the curvature and torsion on osculating, normal, and rectifying planes. We show that the diffracted field has a decomposition in three optical fields propagating along three optical axes that are mutually perpendicular. The decomposition is in terms of the Pearcey and Airy functions, and the generalized Airy function. Experimental results are shown. PMID:26258341

  7. The impact of missing data on clinical trials: A re-analysis of a placebo controlled trial of hypericum perforatum (St Johns Wort) and sertraline in Major Depressive Disorder

    PubMed Central

    Grobler, Anneke C; Matthews, Glenda; Molenberghs, Geert

    2014-01-01

    Rationale and objective Hypericum perforatum (St John’s Wort) is used to treat depression, but the effectiveness has not been established. Recent guidelines described the analysis of clinical trials with missing data, inspiring the re-analysis of this trial using proper missing data methods. The objective was to determine whether hypericum was superior to placebo in treating major depression. Methods A placebo-controlled, randomized clinical trial was conducted for 8 weeks to determine the effectiveness of hypericum or sertraline in reducing depression, measured using the Hamilton depression scale. We performed sensitivity analyses under different assumptions about the missing data process. Results 340 participants were randomized, with 28% lost to follow-up. The missing data mechanism was not missing completely at random. Under missing at random assumptions, some sensitivity analyses found no difference between either treatment arm and placebo, while some sensitivity analyses found a significant difference between sertraline and placebo (95% credible interval [−0.31;−0.01]), but not between hypericum and placebo [−0.08;0.22]. The results were similar when the missing data process was assumed to be missing not at random (95%credible interval for week by sertraline interaction [−0.31;−0.01]; week by hypericum interaction [−0.08;0.22]). Conclusions There is no difference between hypericum and placebo, regardless of the assumption about the missing data process. There is a significant difference between sertraline and placebo with some statistical methods used. It is important to conduct an analysis that takes account of missing data using valid statistically principled methods. The assumptions about the missing data process could influence the results. PMID:24232445

  8. Marcel Breuer at Saint John's

    ERIC Educational Resources Information Center

    Carlson, Scott

    2008-01-01

    A visitor to Saint John's University and Saint John's Abbey, in north-central Minnesota, sees something of Gothic heritage while standing in front of the abbey church, designed and built around 1960. The church's 112-foot campanile--a trapezoidal slab made of 2,500 tons of steel and concrete--stands boldly in front of a huge concrete honeycomb…

  9. What is the diffraction limit? From Airy to Abbe using direct numerical integration

    NASA Astrophysics Data System (ADS)

    Calm, Y. M.; Merlo, J. M.; Burns, M. J.; Kempa, K.; Naughton, M. J.

    The resolution of a conventional optical microscope is sometimes taken from Airy's point spread function (PSF), 0 . 61 λ / NA , and sometimes from Abbe, λ / 2 NA , where NA is the numerical aperture, however modern fluorescence and near-field optical microscopies achieve spatial resolution far better than either of these limits. There is a new category of 2D metamaterials called planar optical elements (POEs), which have a microscopic thickness (< λ), macroscopic transverse dimensions (> 100 λ), and are composed of an array of nanostructured light scatterers. POEs are found in a range of micro- and nano-photonic technologies, and will influence the future optical nanoscopy. With this pretext, we shed some light on the 'diffraction limit' by numerically evaluating Kirchhoff's scalar formulae (in their exact form) and identifying the features of highly non-paraxial, 3D PSFs. We show that the Airy and Abbe criteria are connected, and we comment on the design rules for a particular type of POE: the flat lens. This work is supported by the W. M. Keck Foundation.

  10. John Bartlett and bioterrorism.

    PubMed

    Henderson, D A

    2014-09-15

    Until 1997, the subject of bioterrorism was not discussed within the medical community and deliberately ignored in national planning efforts. Biological weapons were regarded as "morally repulsive." This complacency stemmed from a 1972 Biological Weapons Convention where all countries agreed to cease offensive biological weapons research. In the 1990s, however, the Soviet Union was discovered to have an extensive bioweapons program and a Japanese religious cult sought to launch an anthrax attack on Tokyo. Biological weapons such as smallpox and anthrax had the potential to cause a national catastrophe. However, little was done until John Bartlett in 1997 led a symposium and program to educate the medical community and the country of the need for definitive bioweapons programs. It was highly persuasive and received a final stimulus when the anthrax attack occurred in the United States in 2001. PMID:25151482

  11. JOHN MUIR WILDERNESS, CALIFORNIA.

    USGS Publications Warehouse

    Dellinger, David A.; Johnson, Frederick L.

    1984-01-01

    The mineral survey of the John Muir Wilderness, California revealed eight areas of probable and substantiated potential for the occurrence of mineral resources. Tungsten, with accompanying resources of gold, copper, silver, and molybdenum, is found along contacts between granitic rocks and metamorphosed calcareous sedimentary rocks; it is estimated that more than 1 million tons of demonstrated tungsten resources exist in areas of sustantiated resource potential within the wilderness. Resources of gold, silver, lead, copper, zinc, molydenum, and cobalt, occur in small deposits not associated with tungsten; however, the known deposits of these commodities are small and the possibility of the occurrence of larger ones is unlikely. The geologic setting precludes the presence of fossil fuel resources.

  12. Computer processing of Mars Odyssey THEMIS IR imaging, MGS MOLA altimetry and Mars Express stereo imaging to locate Airy-0, the Mars prime meridian reference

    NASA Astrophysics Data System (ADS)

    Duxbury, Thomas; Neukum, Gerhard; Smith, David E.; Christensen, Philip; Neumann, Gregory; Albee, Arden; Caplinger, Michael; Seregina, N. V.; Kirk, Randolph L.

    The small crater Airy-0 was selected from Mariner 9 images to be the reference for the Mars prime meridian. Initial analyses were made in year 2000 to tie Viking Orbiter and Mars Orbiter Camera images of Airy-0 to the evolving Mars Orbiter Laser Altimeter global digital terrain model to improve the location accuracy of Airy-0. Based upon this tie and radiometric tracking of landers / rovers from earth, new expressions for the Mars spin axis direction, spin rate and prime meridian epoch value were produced to define the orientation of the Martian surface in inertial space over time. Now that the Mars Global Surveyor mission and the Mars Orbiter Laser Altimeter global digital terrain model are complete, a more exhaustive study has been performed to determine the location of Airy-0 relative to the global terrain grid. THEMIS IR image cubes of the Airy and Gale crater regions were tied to the global terrain grid using precision stereo photogrammetric image processing techniques. The Airy-0 location was determined to be within 50 meters of the currently defined IAU prime meridian, with this offset at the limiting absolute accuracy of the global terrain grid. Additional outputs of this study were a controlled multi-band photomosaic of Airy, precision alignment and geometric models of the ten THEMIS IR bands and a controlled multi-band photomosaic of Gale crater used to validate the Mars Surface Laboratory operational map products supporting their successful landing on Mars.

  13. Evolution of finite energy Airy pulses and soliton generation in optical fibers with cubic-quintic nonlinearity.

    PubMed

    Zhong, Xianqiong; Du, Xiantong; Cheng, Ke

    2015-11-16

    We numerically simulate the propagation of finite energy Airy pulses in optical fibers with cubic-quintic nonlinearity and analyze the effects of quintic nonlinear parameters and soliton order number on their evolution properties. The soliton pulses are observed, whose peak amplitudes and corresponding temporal positions will vary with the propagation distance. Depending on different quintic nonlinearity parameters and soliton order number, the soliton pulse temporal positions exhibit weak decayed oscillations and then nearly linearly shift to leading or trailing edge of the Airy wavepacket, or tend to fixed positions, and the peak amplitudes also exhibit decayed oscillations but with different oscillation amplitude and central values. For large soliton order number, the soliton pulses are considerably compressed. Other weak dispersive wave pulses will appear near the main soliton pulses and gradually depart from the main soliton pulses. In the case of small soliton order, despite their considerable energy attenuation, the main lobes and even minority of the neighboring side lobes of the Airy pulses can still recover from the energy transfer to the soliton pulses and the dispersive wave pulses and maintain their unique properties of self-healing and self-acceleration in time for a very long distance. In the case of large soliton order, however, the Airy wavepacket only remains its very weak background and even disappears quickly. PMID:26698430

  14. Pope John XXI, ophthalmologist.

    PubMed

    Blanchard, D

    1995-01-01

    Pope John XXI was an ophthalmologist before becoming Pope. He was born in Lisbon and trained at University of Paris and was part of the early medical school faculty in Siena. He became physician for Pope Gregory X and shifted to church duties. He rose quickly in the ranks of the Catholic church and was elected Pope in 1276 AD. His term was short. He died when construction in the Papal Palace at Viterbo, collapsed on him. His text book is in two parts with introductions to the eye followed by descriptions of diseases with their mostly medical treatments. He concludes with a section about his own wonderful waters. The work survived and a copy was even found amongst Michelangelo's papers. Unfortunately the book turns out to be a plagiarism of two earlier text books. His most notable achievement supposedly was discovering that glaucoma was a disease with a hard eye. It turns out that this section is referring only to a suppurative external disease with indurated lids called sclerophthalmia. PMID:7555583

  15. Searching for John Goodricke

    NASA Astrophysics Data System (ADS)

    French, Linda M.

    2010-01-01

    John Goodricke (1764-1786) is one of the most intriguing and enigmatic figures in the history of astronomy. Deaf from the age of five, his observations of the light variation of Algol brought him acclaim and the Copley Medal of the Royal Society by the age of nineteen. Together with his neighbor, mentor, and distant relative Edward Pigott, he went on to discover and quantify the light variations of other stars, including Delta Cephei. Goodricke's careful accounts of his observations, and their accuracy, remain a model of clear scientific thinking and reporting. Goodricke's career was short, as was his time on Earth: he died before his 22nd birthday. He left few personal notes or letters, and even many basic circumstances of his life have been misunderstood or misinterpreted. I will discuss Goodricke's apparent change of mind regarding the variations of Algol. I will further describe recent research into his family circumstances and into the allegation advanced by Zdenek Kopal in the 1980s that Goodricke was buried apart from his family because they were ashamed of his deafness.

  16. John Herschel's Graphical Method

    NASA Astrophysics Data System (ADS)

    Hankins, Thomas L.

    2011-01-01

    In 1833 John Herschel published an account of his graphical method for determining the orbits of double stars. He had hoped to be the first to determine such orbits, but Felix Savary in France and Johann Franz Encke in Germany beat him to the punch using analytical methods. Herschel was convinced, however, that his graphical method was much superior to analytical methods, because it used the judgment of the hand and eye to correct the inevitable errors of observation. Line graphs of the kind used by Herschel became common only in the 1830s, so Herschel was introducing a new method. He also found computation fatiguing and devised a "wheeled machine" to help him out. Encke was skeptical of Herschel's methods. He said that he lived for calculation and that the English would be better astronomers if they calculated more. It is difficult to believe that the entire Scientific Revolution of the 17th century took place without graphs and that only a few examples appeared in the 18th century. Herschel promoted the use of graphs, not only in astronomy, but also in the study of meteorology and terrestrial magnetism. Because he was the most prominent scientist in England, Herschel's advocacy greatly advanced graphical methods.

  17. Magic moments with John Bell

    SciTech Connect

    Bertlmann, Reinhold A.

    2015-07-15

    John Bell, with whom I had a fruitful collaboration and warm friendship, is best known for his seminal work on the foundations of quantum physics, but he also made outstanding contributions to particle physics and accelerator physics.

  18. John Glenn Entering Friendship 7

    NASA Technical Reports Server (NTRS)

    1962-01-01

    Overall view of astronaut John Glenn, Jr., as he enters into the spacecraft Friendship 7 prior to MA-6 launch operations at Launch Complex 14. Astronaut Glenn is entering his spacecraft to begin the first American manned Earth orbital mission.

  19. My working week: John Innes.

    PubMed

    Innes, John

    2016-07-23

    In the first of a new series of features for Vet Record Careers, John Innes describes a recent working week as referrals director for CVS and a RCVS specialist in small animal orthopaedics. PMID:27450857

  20. An Interview with John Wilson.

    ERIC Educational Resources Information Center

    Halstead, J. Mark; McLaughlin, Terence H.

    2000-01-01

    Presents an interview with John Wilson covering topics such as: addressing the people who influenced him, highlighting Wilson's career and home background, and providing discussions on his opinions related to religion, morality, moral education, and the concept of authority. (CMK)

  1. John locke on personal identity.

    PubMed

    Nimbalkar, Namita

    2011-01-01

    John Locke speaks of personal identity and survival of consciousness after death. A criterion of personal identity through time is given. Such a criterion specifies, insofar as that is possible, the necessary and sufficient conditions for the survival of persons. John Locke holds that personal identity is a matter of psychological continuity. He considered personal identity (or the self) to be founded on consciousness (viz. memory), and not on the substance of either the soul or the body. PMID:21694978

  2. John Locke on Personal Identity**

    PubMed Central

    Nimbalkar, Namita

    2011-01-01

    John Locke speaks of personal identity and survival of consciousness after death. A criterion of personal identity through time is given. Such a criterion specifies, insofar as that is possible, the necessary and sufficient conditions for the survival of persons. John Locke holds that personal identity is a matter of psychological continuity. He considered personal identity (or the self) to be founded on consciousness (viz. memory), and not on the substance of either the soul or the body. PMID:21694978

  3. Propagation of an Airy-Gaussian vortex beam in linear and nonlinear media

    NASA Astrophysics Data System (ADS)

    Chen, Chidao; Peng, Xi; Chen, Bo; Peng, Yulian; Zhou, Meiling; Yang, Xiangbo; Deng, Dongmei

    2016-05-01

    We investigate the propagation of an Airy-Gaussian vortex (AiGV) beam in free space and Kerr media. It is interesting to see that the beam will perform self-healing and main lobe focusing both in free space and Kerr media when the vortex locates at the center of the plane. By controlling the number of the topological charge, the beam distribution factor χ 0 and the position of the vortex, we can control the intensity distribution of the AiGV beam in the out plane both in free space and Kerr media. It is found that when the vortex is close to the center of the plane, it has a strong effect on the intensity distribution of the beam. When the beam propagates in the number of the topological charge, the partial collapse will take place even with low initial input power. We find that the main lobe focusing contributes to this partial collapse.

  4. Predicting the past: ancient eclipses and Airy, Newcomb, and Huxley on the authority of science.

    PubMed

    Stanley, Matthew

    2012-06-01

    Greek historical accounts of ancient eclipses were an important, if peculiar, focus of scientific attention in the nineteenth century. Victorian-era astronomers tried to correct the classical histories using scientific methods, then used those histories as data with which to calibrate their lunar theories, then rejected the histories as having any relevance at all. The specific dating of these eclipses--apparently a simple exercise in celestial mechanics--became bound up with tensions between scientific and humanistic approaches to the past as well as with wider social debates over the power and authority of science in general. The major figures discussed here, including G. B. Airy, Simon Newcomb, and T. H. Huxley, argued that the critical question was whether science could speak authoritatively about the past. To them, the ability of science to talk about the past indicated its power to talk about the future; it was also the fulcrum of fierce boundary disputes among science, history, and religion. PMID:22908421

  5. 33 CFR 110.73 - St. Johns River, Fla.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... latitude 30°15′11″, longitude 81°41′23″; thence to latitude 30°15′13″, longitude 81°41′14″; thence to latitude 30°15′03″, longitude 81°41′11″; thence to latitude 30°15′04″, longitude 81°41′20″; and thence to... latitude 30°15′03″, longitude 81°41′28″; thence to latitude 30°15′02″, longitude 81°41′10″; thence...

  6. 33 CFR 110.73 - St. Johns River, Fla.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... latitude 30°15′11″, longitude 81°41′23″; thence to latitude 30°15′13″, longitude 81°41′14″; thence to latitude 30°15′03″, longitude 81°41′11″; thence to latitude 30°15′04″, longitude 81°41′20″; and thence to... latitude 30°15′03″, longitude 81°41′28″; thence to latitude 30°15′02″, longitude 81°41′10″; thence...

  7. The Greening of a University: The St. John's Sustainability Initiative

    ERIC Educational Resources Information Center

    Pellow, James P.; Anand, Brij

    2009-01-01

    With "greening" projects dotting the landscape of higher education across the nation, it is encouraging to witness the commitment of many colleges and universities to helping secure the future environmental viability of the nation. The challenges that come with this commitment, however, are not insignificant. A comprehensive university-wide…

  8. Real-time sensor mapping display for airborne imaging sensor test with the adaptive infrared imaging spectroradiometer (AIRIS)

    NASA Astrophysics Data System (ADS)

    Burton, Megan M.; Cruger, William E.; Gittins, Christopher; Kindle, Harry; Ricks, Timothy P.

    2005-11-01

    Captive flight testing (CFT) of sensors and seekers requires accurate data collection and display for sensor performance evaluation. The U.S. Army Redstone Technical Test Center (RTTC), in support of the U.S. Army Edgewood Chemical Biological Center (ECBC), has developed a data collection suite to facilitate airborne test of hyperspectral chemical/biological sensors. The data collection suite combines global positioning system (GPS) tracking, inertial measurement unit (IMU) data, accurate timing streams, and other test scenario information. This data collection suite also contains an advanced real-time display of aircraft and sensor field-of-view information. The latest evolution of this system has been used in support of the Adaptive InfraRed Imaging Spectroradiometer (AIRIS), currently under development by Physical Sciences Incorporated for ECBC. For this test, images from the AIRIS sensor were overlaid on a digitized background of the test area, with latencies of 1 second or less. Detects of surrogate chemicals were displayed and geo-referenced. Video overlay was accurate and reliable. This software suite offers great versatility in the display of imaging sensor data; support of future tests with the AIRIS sensor are planned as the system evolves.

  9. Foreword: Sir John Pendry FRS Sir John Pendry FRS

    NASA Astrophysics Data System (ADS)

    Inglesfield, John; Echenique, Pedro

    2008-07-01

    John Pendry John Inglesfield and Pedro Echenique write: John Pendry's 65th birthday is on 4 July 2008, and this issue of the Journal of Physics: Condensed Matter is dedicated to him, with articles by friends, colleagues, and former students. By any standards, John Pendry is a great scientist, who has made—and continues to make—an enormous contribution to physics; the wide range of his interests is reflected in the scope of these articles. Not many scientists can establish a completely new and unexpected area of research, but this has been John's achievement in the last few years in the field of metamaterials, materials whose electromagnetic properties depend on their structure rather than the materials of which the structure is built. In this way, structures with effectively negative electrical permittivity and negative magnetic permeability can be constructed, demonstrating negative refraction; through metamaterials scientists now have access to properties not found in nature, and never previously explored experimentally. Never a week goes by without a potential new application of metamaterials, whether it is perfect lensing, or the cloak of invisibility. This has certainly led to tremendous visibility for John himself, with guest lectures all over the world, and radio and television appearances. John Pendry's first paper was published exactly 40 years ago, 'Analytic properties of pseudopotentials' [1], and since then he has published 310 articles at the latest count. But this first paper already reflected something of the way John works. His PhD project, with Volker Heine at the Cavendish Laboratory, was to interpret the scattering of low energy electrons from surfaces, the technique of LEED which was to become the method of choice for determining surface structure. Although the energy of the electrons in LEED is relatively low—say 50 eV—it is much higher than the energy of the conduction electrons, for which pseudopotentials had been devised, and John

  10. Plume Aerosol Size Distribution Modeling and Comparisons to PrAIRie2005 Field Study Data

    NASA Astrophysics Data System (ADS)

    Cho, S.; Liggio, J.; Makar, P.; Li, S.; Racinthe, J.

    2006-12-01

    As part of the analysis phase of the PrAIRie2005 field study, the effects of different Edmonton-area emission sources on local air-quality are being examined. Four large coal-fired power-plants are located to the West of the city. Here, the effects of these power-plants on urban and regional air-quality will be examined, using both plume and regional air-quality models. During the last few decades, coal-fired power plants have been found to be as a major source of pollution, affecting public-health. According to NACEC (North American Commission for Environmental Corporation, 2001)'s report, 46 of the top 50 air polluters in North America were power plants. The importance of such sources has resulted in several attempts to improve understanding of the basic formation mechanisms of plume particulate matter. Sulphur dioxide contributes to acidifying emissions and to the production of secondary acidic aerosols that have been linked to a number of serious human health problems, acid rain and visibility (Seinfeld and Pandis, 1998; Hidy, 1984; Wilson and McMurray, 1981). Primary particulate matter originating directly from coal-fired power plants may also increase secondary particulate mass by providing a surface for sulphuric acid absorption . Environment Canada's PrAIRie2005 field study between August 12th and September 7th, 2005 included overflights and downwind measurements near the Edmonton powerplants (Wabamun, Sundance, Keephills and Genesee). The data collected consisted of particle size distributions, ozone, NOX, total mass and the chemical composition of fine particles. In order to investigate and improve our understanding of the formation mechanisms and physical properties of power-plant-generated aerosols in the Edmonton area, the Plume Aerosol Microphysical (PAM) model has been employed. This model accounts for gas-phase chemistry, aerosol microphysical processes (i.e. homogeneous/heterogeneous nucleation, condensation/evaporation and coagulation) and

  11. Evidence for Mini-Magnetospheres at four Lunar Magnetic Anomalies: Reiner-Gamma, Airy, Descartes and Crozier

    NASA Astrophysics Data System (ADS)

    Nayak, M.; Garrick-Bethell, I.; Hemingway, D.

    2014-12-01

    Lunar swirls are enigmatic high-albedo surface markings co-located with magnetic anomalies. The existence of mini-magnetospheres has been proposed as a formation mechanism, making small-scale magnetic field interactions with the solar wind of interest. Using data from the Lunar Prospector, Clementine, and Advanced Composition Explorer missions, we develop three metrics for the identification of mini-magnetospheres: 1) presence of coherent magnetism at low altitude for magnetic field measurements taken in the solar wind; 2) directional field distortions that are correlated with changes in incident solar wind azimuth; 3) intensification of total field strength. These metrics are applied to four lunar magnetic anomalies with various reflectances and magnetic field strengths, ranging from fully developed swirls (Reiner-Gamma, Airy) to diffuse albedo patches which may or may not be swirls (Descartes, Crozier). Specifically, we compare magnetic field measurements in the solar wind to source magnetization models constructed from observations in the lunar wake and Earth's magnetotail. By applying these criteria, we confirm previous findings of magnetosphere-like phenomena at Reiner-Gamma. We also find evidence of these phenomena at Descartes and Airy, and propose that mini-magnetospheres may exist here. At Airy, very large upwind distortions are observed, comparable to the length scale of the anomaly itself. At Reiner-Gamma and Descartes, this distortion is significantly smaller, yet the average field strengths are higher, implying that the scale of distortion is linked to the anomaly's field strength. Interestingly, at Crozier, the weakest anomaly considered, we do not observe this distortion. However, we do observe evidence of field intensification at high solar wind pressures (16 nPa). While Descartes and Reiner-Gamma are among the strongest anomalies on the Moon, and both exhibit magnetospheric properties, only Reiner-Gamma shows a well-developed swirl pattern

  12. Interview with John Taylor Gatto.

    ERIC Educational Resources Information Center

    Becker, Ellen

    1994-01-01

    Introduces ex-teacher and author John Taylor Gatto's experiences and views on education, including contradictory patterns of family life and education in the United States, based on traditions of various immigrant groups; deleterious impacts of standardization and institutional usurpation of family functions; and conflict between the development…

  13. John Rawls and Affirmative Action.

    ERIC Educational Resources Information Center

    Nagel, Thomas

    2003-01-01

    Discusses the philosophy of John Rawls, asserting that although Rawls never wrote about affirmative action, his ideas are relevant to the issue. Rawls concentrated on "ideal theory," which he believed was the theory of what constituted a truly just society. He considered slavery and racial segregation paradigms of injustice. His ideal theory of…

  14. John Dewey, Gothic and Modern

    ERIC Educational Resources Information Center

    Kaminsky, James S.

    2010-01-01

    It is argued here that understanding John Dewey's thought as that of a prodigal liberal or a fellow traveller does not capture the complexity of his work. It is also important to recognise the portion of his work that is "historie morale." In the very best sense it is epic, encapsulating the hopes and dreams of a history of the American people in…

  15. John Eliot in Recent Scholarship.

    ERIC Educational Resources Information Center

    Cogley, Richard W.

    1990-01-01

    Reviews the recent literature on John Eliot--seventeenth-century Massachusetts missionary, minister, and millenarian. Examines disagreements between Alden Vaughan's and Francis Jennings's interpretations of Eliot's missionary writings and Puritan-Indian relations. Discusses James Axtell's ethnohistorical interpretation of Eliot. Emphasizes the…

  16. The Art of John Biggers

    ERIC Educational Resources Information Center

    Coy, Mary

    2010-01-01

    In their 2005 exhibit of John Biggers' work, the New Orleans Museum of Art described it as being inspired by "African art and culture, the injustices of a segregated United States, the stoic women in his own family, and the heroes of everyday survival." In this article, the author describes how her students reinterpreted Biggers' work. (Contains 1…

  17. John Milton Oskison and Assimilation

    ERIC Educational Resources Information Center

    Larre, Lionel

    2013-01-01

    John Milton Oskison (1874-1947) was a Cherokee writer, journalist, and activist and the author of novels and biographies as well as numerous short stories, essays, and articles about a great variety of subjects. Oskison thought of himself as "an interpreter to the world, of the modern, progressive Indian." The kind of representation Oskison gave…

  18. John Wilson on Moral Education.

    ERIC Educational Resources Information Center

    McLaughlin, Terence H.; Halstead, J. Mark

    2000-01-01

    Describes the approach to moral education utilized by John Wilson focusing on his claims, arguments, and conclusions. Explores eight specific topics, such as his general perspective on moral education and the meaning and nature of moral. Reports on the areas of difficulty and criticism in relation to his approach. (CMK)

  19. The Johns Hopkins Hospital Network

    PubMed Central

    Tolchin, Stephen G.; Barta, Wendy; Harkness, Kenneth

    1985-01-01

    The Johns Hopkins Hospital has initiated an ambitious program to apply modern technologies to the development of a new, comprehensive clinical information system. One component of this system is a networking technology for supporting the integration of diverse and functionally distinct information systems. This paper discusses the selection of the networking technology implemented at JHH, issues and problems, networking concepts, protocols and reliability.

  20. John James Audubon & the Turkey

    ERIC Educational Resources Information Center

    Hinshaw, Craig

    2012-01-01

    In the first half of the 1800s, John James Audubon roamed the wilds of America attempting to draw all the birds in their natural habitat. He published his life-sized paintings in a huge book entitled "Birds of America." Audubon developed a unique system of depicting the birds in natural poses, such as flying. After shooting the bird, he would wire…

  1. Symposium: John Dewey: Patron Saint?

    ERIC Educational Resources Information Center

    New York University Education Quarterly, 1979

    1979-01-01

    James E. Wheeler, Mortimer Smith, Walter Feinberg, and Christiana M. Smith comment on the work of John Dewey and its relevance to modern educators. They respectively judge Dewey as significant and enduring, anti-intellectual, biased, and ambiguous. (Editor/SJL)

  2. John Wilson as Moral Educator

    ERIC Educational Resources Information Center

    Harrison, John L.

    1977-01-01

    The work of John Wilson, now teaching at Oxford University, as moral educator is summarized and evaluated. His rationalist humanistic approach is based on a componential characterization of the morally educated person. The rationale and conceptual status of the components is discussed. His position is compared to that of Peter McPhail, R. S.…

  3. John Milton: A Research Guide.

    ERIC Educational Resources Information Center

    Van Noate, Judith, Comp.

    This handout is a guide to library resources in the J. Murrey Atkins Library at the University of North Carolina-Charlotte, for sources of criticism for the study of 17th-century British author John Milton. The guide is intended to help readers find critical and biographical information on Milton. It explains important reference sources in the…

  4. John Couch Adams, the astronomer.

    NASA Astrophysics Data System (ADS)

    Foster, N.

    1989-03-01

    The planet Neptune was discovered more than 140 years ago. The circumstances of the discovery gave rise to great controversy, and very nearly led to an international incident between Britain and France, but this was only one of John Couch Adams' many contributions to astronomical science.

  5. John Milton's Rainbow: Sonnet XIX.

    ERIC Educational Resources Information Center

    Scher, Amy

    John Milton presented a wide spectrum of materials and ideas illuminating the literary landscape like a rainbow which critics and authors have been discussing for centuries. One example of the multiple layers of meaning in Milton's poems is found in Sonnet XIX, which can be useful for both forensic discussion as well as for composition…

  6. John N Bahcall (1934 2005)

    NASA Astrophysics Data System (ADS)

    Bergström, Lars; Botner, Olga; Carlson, Per; Hulth, Per Olof; Ohlsson, Tommy

    2005-01-01

    John Norris Bahcall, passed away on August 17, 2005, in NewYork City, USA. He was born on December 30, 1934, in Shreveport, Louisiana, USA. He was Richard Black Professor of Astrophysics in the School of Natural Sciences at the Institute forAdvanced Study (IAS) in Princeton, New Jersey, USA and a recipient of the National Medal of Science. In addition, he was President of the American Astronomical Society, President-Elect of the American Physical Society, and a prominent leader of the astrophysics community. John had a long and prolific career in astronomy and astrophysics, spanning five decades and the publication of more than five hundred technical articles, books, and popular papers. John's most recognized scientific contribution was the novel proposal in 1964, together with Raymond Davis Jr, that scientific mysteries of our Sun `how it shines, how old it is, how hot it is' could be examined by measuring the number of neutrinos arriving on Earth from the Sun. Measuring the properties of these neutrinos tests both our understanding of how stars shine and our understanding of fundamental particle physics. However, in the 1960s and 1970s, the observations by Raymond Davis Jr showed a clear discrepancy between John's theoretical predictions, based on standard solar and particle physics models, and what was experimentally measured. This discrepancy, known as the `Solar Neutrino Problem', was examined by hundreds of physicists, chemists, and astronomers over the subsequent three decades. In the late 1990s through 2002, new large-scale neutrino experiments in Japan, Canada, Italy, and Russia culminated in the conclusion that the discrepancy between John's theoretical predictions and the experimental results required a modification of our understanding of particle physics: neutrinos must have a mass and `oscillate' among different particle states. In addition to neutrino astrophysics, John contributed to many areas of astrophysics including the study of dark matter in

  7. Acoustic Resonance of a Two-Dimensional Isotropic Medium Studied Using Airy Stress Function

    NASA Astrophysics Data System (ADS)

    Tarumi, Ryuichi; Yamada, Shinpei; Shibutani, Yoji

    2012-07-01

    We have developed a theory that determines a complete set of stress field, σij, in a freely vibrating two-dimensional isotropic medium within the framework of the calculus of variation. Our formulation is based on the Airy stress function φ and the minimization of the complementary strain energy under the constrain condition || φ|| 2L2 =const. By the Ritz method, the constrained variational problem becomes a linear eigenvalue problem. Numerical analysis yields 36 types of the stress functions φi. Unlike the stress fields determined from the conventional resonant ultrasound spectroscopy theory, the stress fields derived from the stress functions φi explicitly satisfy the stress-free natural boundary condition and the equilibrium equation. It is also confirmed that the 36 resonant modes can be classified into four groups according to the parity of the coefficient of the basis function. Furthermore, the stress functions φi are orthogonal in the sense of the L2 inner product. These features are similar to those of the conventional resonant ultrasound spectroscopy (RUS) theory.

  8. Propagation properties of Airy-Gaussian vortex beams through the gradient-index medium.

    PubMed

    Zhao, Ruihuang; Deng, Fu; Yu, Weihao; Huang, Jiayao; Deng, Dongmei

    2016-06-01

    Propagation of Airy-Gaussian vortex (AiGV) beams through the gradient-index medium is investigated analytically and numerically with the transfer matrix method. Deriving the analytic expression of the AiGV beams based on the Huygens diffraction integral formula, we obtain the propagate path, intensity and phase distributions, and the Poynting vector of the first- and second-order AiGV beams, which propagate through the paraxial ABCD system. The ballistic trajectory is no longer conventional parabolic but trigonometric shapes in the gradient-index medium. Especially, the AiGV beams represent the singular behavior at the propagation path and the light intensity distribution. The phase distribution and the Poynting vector exhibit in reverse when the AiGV beams through the singularity. As the order increases, the main lobe of the AiGV beams is gradually overlapped by the vortex core. Further, the sidelobe weakens when the AiGV beams propagate nearly to the singularity. Additionally, the figure of the Poynting vector of the AiGV beams proves the direction of energy flow corresponding to the intensity distribution. The vortex of the second-order AiGV beams is larger, and the propagation velocity is faster than that of the first order. PMID:27409428

  9. Manipulation of Raman-induced frequency shift by use of asymmetric self-accelerating Airy pulse.

    PubMed

    Zhang, Lifu; Zhong, Haizhe; Li, Ying; Fan, Dianyuan

    2014-09-22

    We investigate the evolution of asymmetric self-accelerating finite energy Airy pulses (FEAP) in optical fibers with emphasis on the role of Raman scattering. We show that the Raman-induced frequency shift (RIFS) of soliton initiated by an asymmetric self-accelerating FEAP depends not only on the launched peak power but also on the truncation coefficient imposed on the asymmetric self-accelerating FEAP. We find that the RIFS of asymmetric self-accelerating FEAP increases with a decrease in the truncation coefficient, while the peak power and spectrum width of the outermost red shift of the shedding soliton spectrum are almost unchanged. The time and frequency shifts of the shedding soliton are found to be sensitive to the truncation coefficient when the truncation coefficient is in the range of 0 to 0.1. These excellent features would lead to the realization of a RIFS-based tunable light source by launching self-accelerating FEAP with different truncation coefficient into an optical fiber. PMID:25321729

  10. Dynamic enhancement of autofocusing property for symmetric Airy beam with exponential amplitude modulation

    NASA Astrophysics Data System (ADS)

    Liu, Weiwei; Lu, Yao; Gong, Lei; Chu, Xiuxiang; Xue, Guosheng; Ren, Yuxuan; Zhong, Mincheng; Wang, Ziqiang; Zhou, Jinhua; Li, Yinmei

    2016-07-01

    A symmetric Airy beam (SAB) autofocuses during free space propagation. Such autofocusing SAB is useful in optical manipulation and biomedical imaging. However, its inherently limited autofocusing property may degrade the performance of the SAB in those applications. To enhance the autofocus, a symmetric apodization mask was proposed to regulate the SAB. In combination with the even cubic phase that shapes the SAB, this even exponential function mask with an adjustable parameter regulates the contribution of different frequency spectral components to the SAB. The propagation properties of this new amplitude modulated SAB (AMSAB) were investigated both theoretically and experimentally. Simulation shows that the energy distribution and autofocusing property of an AMSAB can be adjusted by the exponential amplitude modulation. Especially, the beam energy will be more concentrated in the central lobe once the even cubic phase is modulated by the mask with a higher proportion of high-frequency spectral components. Consequently, the autofocusing property and axial gradient force of AMSABs are efficiently enhanced. The experimental generation and characterization for AMSABs were implemented by modulating the collimated beam with a phase-only spatial light modulator. The experimental results well supported the theoretical predictions. With the ability to enhance the autofocus, the proposed exponential apodization modulation will make SAB more powerful in various applications, including optical trapping, fluorescence imaging and particle acceleration.

  11. John Glenn: Chosen To Cross The Threshold

    NASA Technical Reports Server (NTRS)

    1963-01-01

    John Glenn in training. From film to tape transfer of the film 'Friendship 7 - John Glenn' Depicts the historical orbital flight of John Glenn aboard 'Friendship 7', launched on February 20, 1962. Footage of staff at tracking stations worldwide and at Goddard Space Flight Center. Launch from cape canaveral. Flight tracking, re-entry, landing and recovery of Friendship 7.

  12. Foreword: Sir John Pendry FRS Sir John Pendry FRS

    NASA Astrophysics Data System (ADS)

    Inglesfield, John; Echenique, Pedro

    2008-07-01

    John Pendry John Inglesfield and Pedro Echenique write: John Pendry's 65th birthday is on 4 July 2008, and this issue of the Journal of Physics: Condensed Matter is dedicated to him, with articles by friends, colleagues, and former students. By any standards, John Pendry is a great scientist, who has made—and continues to make—an enormous contribution to physics; the wide range of his interests is reflected in the scope of these articles. Not many scientists can establish a completely new and unexpected area of research, but this has been John's achievement in the last few years in the field of metamaterials, materials whose electromagnetic properties depend on their structure rather than the materials of which the structure is built. In this way, structures with effectively negative electrical permittivity and negative magnetic permeability can be constructed, demonstrating negative refraction; through metamaterials scientists now have access to properties not found in nature, and never previously explored experimentally. Never a week goes by without a potential new application of metamaterials, whether it is perfect lensing, or the cloak of invisibility. This has certainly led to tremendous visibility for John himself, with guest lectures all over the world, and radio and television appearances. John Pendry's first paper was published exactly 40 years ago, 'Analytic properties of pseudopotentials' [1], and since then he has published 310 articles at the latest count. But this first paper already reflected something of the way John works. His PhD project, with Volker Heine at the Cavendish Laboratory, was to interpret the scattering of low energy electrons from surfaces, the technique of LEED which was to become the method of choice for determining surface structure. Although the energy of the electrons in LEED is relatively low—say 50 eV—it is much higher than the energy of the conduction electrons, for which pseudopotentials had been devised, and John

  13. Welfare effects of reduced milk production associated with Johne's disease on Johne's-positive versus Johne's-negative dairy operations.

    PubMed

    Losinger, Willard C

    2006-08-01

    An examination of the economic impacts of reduced milk production associated with Johne's disease on Johne's-positive and Johne's-negative dairy operations indicated that, if Johne's disease had not existed in US dairy cows in 1996, then the economic surplus of Johne's-negative operations would have been $600 million+/-$530 million lower, while the economic surplus of Johne's-positive operations would have been higher by $28 million+/-$79 million, which was not significantly different from zero. The data available for projecting changes in surplus were not sufficiently precise to allow an exact statement on whether Johne's-positive operations would have been better or worse off economically, in terms of the value received for producing more milk if they had not been affected by Johne's disease. The changes in producer surplus, based upon eliminating specific epidemiological risk factors for Johne's disease, were disaggregated between Johne's-positive dairy operations exposed to the risk factor and all other US dairy operations. Eliminating the risk factor of having any cows not born on the operation would have had a significant positive effect on the economic surplus of Johne's-positive operations that had any cows not born on the operation. PMID:16827950

  14. John Glenn: Enters Friendship 7 to Prepare for Launch

    NASA Technical Reports Server (NTRS)

    1963-01-01

    John glenn entering the capsule prior to the launch of Friendship 7 From: The John Glenn Story: Summary of astronaut John Glenn's flying career, from naval aviation training to space flight. The Mercury project is featured as John Glenn flies the Friendship 7 spacecraft. President John F. Kennedy presents the NASA Distinguished service Medal to Astronaut John Glenn.

  15. John Glenn: Post-Flight Recovery of Friendship 7

    NASA Technical Reports Server (NTRS)

    1963-01-01

    Mini Biography of John Glenn, as it was up to 1962. From: The John Glenn Story: Summary of astronaut John Glenn's flying career, from naval aviation training to space flight. The Mercury project is featured as John Glenn flies the Friendship 7 spacecraft. President John F. Kennedy presents the NASA Distinguished service Medal to Astronaut John Glenn.

  16. John Glenn: Presented with NASA Distinguished Service Medal

    NASA Technical Reports Server (NTRS)

    1963-01-01

    John Glenn tours with his family, meets JFK and is presented with the NASA distinguished Service Medal. From: The John Glenn Story: Summary of astronaut John Glenn's flying career, from naval aviation training to space flight. The Mercury project is featured as John Glenn flies the Friendship 7 spacecraft. President John F. Kennedy presents the NASA Distinguished service Medal to Astronaut John Glenn.

  17. The letters of John Dastin.

    PubMed

    Thiesen, Wilfred

    2008-07-01

    John Dastin, a noted alchemist who lived ca. 1300, followed the lead of many of his contemporaries and predecessors in using letters to propagate his views on alchemy. This article identifies a number of letters that Dastin wrote, and includes one text addressed to a cardinal of the city of Naples. This letter is virtually a copy of a work by Arnold of Villanova. I believe that other works ascribed to Dastin will also show a great dependence on Arnold's works. PMID:19048973

  18. Charles Darwin and John Herschel

    NASA Astrophysics Data System (ADS)

    Warner, B.

    2009-11-01

    The influence of John Herschel on the philosophical thoughts of Charles Darwin, both through the former's book, Natural Philosophy, and through their meeting in 1836 at the Cape of Good Hope, is discussed. With Herschel having himself speculated on evolution just a few months before he met Darwin, it is probable that he stimulated at least the beginnings of the latter's lifelong work on the subject.

  19. John Glenn Biomedical Engineering Consortium

    NASA Technical Reports Server (NTRS)

    Nall, Marsha

    2004-01-01

    The John Glenn Biomedical Engineering Consortium is an inter-institutional research and technology development, beginning with ten projects in FY02 that are aimed at applying GRC expertise in fluid physics and sensor development with local biomedical expertise to mitigate the risks of space flight on the health, safety, and performance of astronauts. It is anticipated that several new technologies will be developed that are applicable to both medical needs in space and on earth.

  20. The location of Airy-0, the Mars prime meridian reference, from stereo photogrammetric processing of THEMIS IR imaging and digital elevation data

    NASA Astrophysics Data System (ADS)

    Duxbury, T. C.; Christensen, P.; Smith, D. E.; Neumann, G. A.; Kirk, R. L.; Caplinger, M. A.; Albee, A. A.; Seregina, N. V.; Neukum, G.; Archinal, B. A.

    2014-12-01

    The small crater Airy-0 was selected from Mariner 9 images to be the reference for the Mars prime meridian. Initial analyses in the year 2000 tied Viking Orbiter and Mars Orbiter Camera images of Airy-0 to the evolving Mars Orbiter Laser Altimeter global digital terrain model to update the location of Airy-0. Based upon this tie and radiometric tracking of landers/rovers from Earth, new expressions for the Mars spin axis direction, spin rate, and prime meridian epoch value were produced to define the orientation of the Martian surface in inertial space over time. Since the Mars Global Surveyor mission and Mars Orbiter Laser Altimeter global digital terrain model were completed some time ago, a more exhaustive study has been performed to determine the accuracy of the Airy-0 location and orientation of Mars at the standard epoch. Thermal Emission Imaging System (THEMIS) IR image cubes of the Airy and Gale crater regions were tied to the global terrain grid using precision stereo photogrammetric image processing techniques. The Airy-0 location was determined to be about 0.001° east of its predicted location using the currently defined International Astronomical Union (IAU) prime meridian location. Information on this new location and how it was derived will be provided to the NASA Mars Exploration Program Geodesy and Cartography Working Group for their assessment. This NASA group will make a recommendation to the IAU Working Group on Cartographic Coordinates and Rotational Elements to update the expression for the Mars spin axis direction, spin rate, and prime meridian location.

  1. John von Neumann Birthday Centennial

    SciTech Connect

    Grcar, Joseph F.

    2004-11-12

    In celebration of John von Neumann's 100th birthday, a series of four lectures were presented on the evening of February 10, 2003 during the SIAM Conference on Computational Science and Engineering in San Diego. The venue was appropriate because von Neumann spent much of the later part of his life, in the 1950's, as an unofficial ambassador for computational science. He was then the only senior American scientist who had experience with the new computers (digital, electronic, and programmable) and a vision of their future importance. No doubt he would have relished the chance to attend a meeting such as this. The first speaker, William Aspray, described the ''interesting times'' during which computers were invented. His remarks were based on his history [1] of this period in von Neumann's life. We were honored to have John von Neumann's daughter, Marina von Neumann-Whitman, as our second speaker. Other accounts of von Neumann's life can be found in books by two of his colleagues [2] and [3]. Our third speaker, Peter Lax, provided both mathematical and international perspectives on John von Neumann's career. Finally, Pete Stewart spoke about von Neumann's numerical error analysis [4] in the context of later work; this talk did not lend itself to transcription, but readers may consult the historical notes in [5]. Our thanks to all the speakers for a remarkable evening. We are grateful to the DOE Applied Mathematical Sciences (AMS) program for partially supporting these lectures. Thanks are also due to SIAM and William Kolata, to our emcee, Gene Golub, to Paul Saylor for recording and editing, and to Barbara Lytle for the transcriptions. More about von Neumann's work can be learned from the recent American Mathematical Society proceedings [6].

  2. John Bardeen: an extraordinary physicist

    NASA Astrophysics Data System (ADS)

    Hoddeson, Lillian

    2008-04-01

    On the morning of 1 November 1956 the US physicist John Bardeen dropped the frying-pan of eggs that he was cooking for breakfast, scattering its contents on the kitchen floor. He had just heard that he had won the Nobel Prize for Physics along with William Shockley and Walter Brattain for their invention of the transistor. That evening Bardeen was startled again, this time by a parade of his colleagues from the University of Illinois marching to the door of his home bearing champagne and singing "For He's a Jolly Good Fellow".

  3. John Dalton (1766-1844).

    PubMed Central

    Emery, A E

    1988-01-01

    There is no doubt that John Dalton ranks among the great names in science, a position which rests on his enunciation of the Atomic Theory. However, his very first scientific paper in 1798 was concerned with his own affliction of colour blindness and was in fact the first clear description of the disorder. This publication stimulated much subsequent research into the pathophysiology and genetics of the condition. His recorded observations on colour blindness are detailed and precise and betoken the approach which was to characterise all his later research in chemistry. Images PMID:3294412

  4. Airy function approach and Numerov method to study the anharmonic oscillator potentials V(x) = Ax2α + Bx2

    NASA Astrophysics Data System (ADS)

    Al Sdran, N.; Maiz, F.

    2016-06-01

    The numerical solutions of the time independent Schrödinger equation of different one-dimensional potentials forms are sometime achieved by the asymptotic iteration method. Its importance appears, for example, on its efficiency to describe vibrational system in quantum mechanics. In this paper, the Airy function approach and the Numerov method have been used and presented to study the oscillator anharmonic potential V(x) = Ax2α + Bx2, (A>0, B<0), with (α = 2) for quadratic, (α =3) for sextic and (α =4) for octic anharmonic oscillators. The Airy function approach is based on the replacement of the real potential V(x) by a piecewise-linear potential v(x), while, the Numerov method is based on the discretization of the wave function on the x-axis. The first energies levels have been calculated and the wave functions for the sextic system have been evaluated. These specific values are unlimited by the magnitude of A, B and α. It's found that the obtained results are in good agreement with the previous results obtained by the asymptotic iteration method for α =3.

  5. John Greenleaf's life of science.

    PubMed

    Watenpaugh, Donald E

    2012-12-01

    This article summarizes the life and career of John E. Greenleaf, PhD. It complements an interview of Dr. Greenleaf sponsored by the American Physiological Society Living History Project found on the American Physiological Society website. Dr. Greenleaf is a "thought leader" and internationally renowned physiologist, with extensive contributions in human systems-level environmental physiology. He avoided self-aggrandizement and believed that deeds rather than words define one's legacy. Viewed another way, however, Greenleaf's words define his deeds: 48% of his 185 articles are first author works, which is an unusually high proportion for a scientist of his stature. He found that writing a thorough and thoughtful discussion section often led to novel ideas that drove future research. Beyond Greenleaf's words are the many students, postdocs, and collaborators lucky enough to have worked with him and thus learn and carry on his ways of science. His core principles included the following: avoid research "fads," embrace diversity, be the first subject in your own research, adhere to rules of fiscal responsibility, and respect administrative forces-but never back down from them when you know you are right. Greenleaf's integrity ensured he was usually right. He thrived on the axiom of many successful scientists: avoid falling in love with hypotheses, so that when unexpected findings appear, they arouse curiosity instead of fear. Dr. Greenleaf's legacy will include the John and Carol Greenleaf Award for prolific environmental and exercise-related publication in the Journal of Applied Physiology. PMID:23209002

  6. John Bardeen and transistor physics

    NASA Astrophysics Data System (ADS)

    Huff, Howard R.

    2001-01-01

    John Bardeen and Walter Brattain invented the point-contact semiconductor amplifier (transistor action) in polycrystalline germanium (also observed in polycrystalline silicon) on Dec. 15, 1947, for which they received a patent on Oct. 3, 1950. Bill Shockley was not a co-patent holder on Bardeen and Brattain's point-contact semiconductor amplifier patent since Julius Lilienfeld had already received a patent in 1930 for what would have been Shockley's contribution; namely, the field-effect methodology. Shockley received patents for both his minority-carrier injection concept and junction transistor theory, however, and deservedly shared the Nobel prize with Bardeen and Brattain for his seminal contributions of injection, p-n junction theory and junction transistor theory. We will review the events leading up to the invention of Bardeen and Brattain's point-contact semiconductor amplifier during the magic month of November 17-December 16, 1947 and the invention of Shockley's junction semiconductor amplifier during his magic month of December 24, 1947-January 23, 1948. It was during the course of Bardeen and Brattain's research in November, 1947 that Bardeen also patented the essence of the MOS transistor, wherein the induced minority carriers were confined to the inversion layer enroute to the collector. C. T. Sah has described this device as a sourceless MOS transistor. Indeed, John Bardeen, co-inventor of the point-contact semiconductor amplifier and inventor of the MOS transistor, may rightly be called the father of modern electronics.

  7. Engineering deceleration and acceleration of soliton emitted from Airy pulse with quadratic phase modulation in optical fibers without high-order effects

    NASA Astrophysics Data System (ADS)

    Zhang, Lifu; Liu, Kun; Zhong, Haizhe; Zhang, Jinggui; Deng, Jianqin; Li, Ying; Fan, Dianyuan

    2015-07-01

    Soliton propagation direction can be engineered in optical fibers in the presence of high-order effects (HOEs). It is well known that Raman effects can decelerate the soliton. Here we investigate the manipulation of the deceleration or acceleration of soliton emitted from Airy pulse whose spectrum is imposed an initial quadratic phase modulation (QPM) in optical fibers in the absence of HOEs. We show that, under the action of the anomalous second-order dispersion (SOD) and Kerr nonlinearity, Airy pulse with QPM is able to emit soliton with acceleration or deceleration depending on whether the QPM is negative or positive, and at a rate that is determined by the magnitude of QPM. The reason is that the acceleration behaviors of incident Airy pulse is altered depending on whether SOD and QPM have the same or opposite signs. Our study shows the possibility of controlling and manipulating the soliton propagation and interaction in optical fibers without HOEs, by purposely choosing appropriate QPM parameter of an Airy pulse.

  8. Engineering deceleration and acceleration of soliton emitted from Airy pulse with quadratic phase modulation in optical fibers without high-order effects.

    PubMed

    Zhang, Lifu; Liu, Kun; Zhong, Haizhe; Zhang, Jinggui; Deng, Jianqin; Li, Ying; Fan, Dianyuan

    2015-01-01

    Soliton propagation direction can be engineered in optical fibers in the presence of high-order effects (HOEs). It is well known that Raman effects can decelerate the soliton. Here we investigate the manipulation of the deceleration or acceleration of soliton emitted from Airy pulse whose spectrum is imposed an initial quadratic phase modulation (QPM) in optical fibers in the absence of HOEs. We show that, under the action of the anomalous second-order dispersion (SOD) and Kerr nonlinearity, Airy pulse with QPM is able to emit soliton with acceleration or deceleration depending on whether the QPM is negative or positive, and at a rate that is determined by the magnitude of QPM. The reason is that the acceleration behaviors of incident Airy pulse is altered depending on whether SOD and QPM have the same or opposite signs. Our study shows the possibility of controlling and manipulating the soliton propagation and interaction in optical fibers without HOEs, by purposely choosing appropriate QPM parameter of an Airy pulse. PMID:26173387

  9. Double scaling limits and airy functions for {ital O}({ital N}) vector sigma models with elementary catastrophes or the catastrophe {ital X}{sub 9}

    SciTech Connect

    Ruehl, W.

    1996-05-01

    One and two vector sigma models are defined that possess catastrophes in their action. Each catastrophe defines a double scaling limit at {ital N}{r_arrow}{infinity}. Critical indices are calculated and the Airy functions are shown to satisfy RG equations. Copyright {copyright} 1996 Academic Press, Inc.

  10. Toward the 21st Century in Mathematics Education.

    ERIC Educational Resources Information Center

    O'Brien, Thomas C., Ed.

    In an effort to prepare students for the 21st century, this book provides ideas and suggestions for educators on critical areas in mathematics education. A series of articles is presented on content changes, instructional strategies, and the role of computers. These articles include: (1) "Status of Computers" (John Ellsworth); (2) "New Topics for…

  11. St. Lucia.

    PubMed

    1987-06-01

    The population of St Lucia was 123,000 in 1986, with an annual growth rate of 2%. The infant mortality rate stands at 22.2/1000 live births, and life expectancy is 70.3 years for males and 74.9 years for females. The literacy rate is 78%. St Lucia's labor force is allocated as follows: agriculture, 36.6%; industry and commerce, 20.1%; and services, 18.1%. The gross national product (GNP) was US$146 million in 1985, with an annual growth rate of 3% and a per capita GNP of $1071. St Lucia is a parliamentary democracy modeled on the British Westminster system. The island is divided into 16 parishes and 1 urban area (the capital, Castries). St Lucia is currently a politically stable country, although the high level of youth unemployment is a cause for concern. Ongoing stability may depend on the government's ability to provide services such as jobs and housing. The economy has evolved from a monocrop sugar plantation type to a diversified economy based on agriculture, industry, and tourism. Agriculture, dominated by the banana industry, is characterized by the participation of a large number of small and medium-sized enterprises. Industry is being encouraged through the provision of incentives such as tax rebates. The government is attempting to maintain a sound investment climate through a tripartite dialogue with the private sector and trade unions. Overall economic policy is predicated on the attraction of sound investments, by both local and foreign entities, to accelerate the rate of economic growth, solve the unemployment problem, and generate a solid balance-of-payments position. PMID:12177918

  12. John Herschel and astronomy: a bicentennial appraisal.

    NASA Astrophysics Data System (ADS)

    Hoskin, M. A.

    An assessment is given of John Herschel's overall contributions to nineteenth century astronomy. John Herschel built on his pioneering father William Herschel's foundations, with revisions and extensions to the southern hemisphere. His work, incorporated into his general treatises on astronomy, had a major influence on the direction of astronomical progress.

  13. John Herschel: Britain's first modern physical scientist.

    NASA Astrophysics Data System (ADS)

    Crowe, M. J.

    The author presents a sketch of the life and contributions to science of Sir John F. W. Herschel (1792 - 1871). One of the theses he develops is that John Herschel can meaningfully be described as Britain's first modern physical scientist. In addition to developing this thesis, the author makes some remarks about lesser known aspects of Herschel's life.

  14. Symposium on John Dewey's "Art as Experience."

    ERIC Educational Resources Information Center

    Burnett, Joe R.; And Others

    1989-01-01

    Reports on a symposium about John Dewey's philosophy of art. John Fisher, Richard Shusterman, and Joe R. Burnett state their views on Dewey's contributions to art theory and aesthetics citing Dewey's work, "Art As Experience." The consensus was that although Dewey's opinions are dated, his pragmatist's views offer the opportunity for further study…

  15. Solving: The Case of John, Part I

    ERIC Educational Resources Information Center

    Drell, Martin J.; Josephson, Allan; Pleak, Richard; Riggs, Paula; Rosenfeld, Alvin

    2006-01-01

    In this article, one of the authors was called to see an 18-year old boy named John, who had done poorly during his first year at college and was depressed. His parents feared that their son may be suicidal, a concern heightened by the recent news that one of their son's friends had committed suicide. Here, he interviews John about his…

  16. 75 FR 49497 - John Bonnes: Debarment Order

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-13

    ... HUMAN SERVICES Food and Drug Administration John Bonnes: Debarment Order AGENCY: Food and Drug... the Federal Food, Drug, and Cosmetic Act (the act) debarring John Bonnes for a period of 5 years from... the act, under authority delegated to the Director (Staff Manual Guide 1410.35), finds that Mr....

  17. A to Z with Jasper Johns

    ERIC Educational Resources Information Center

    Kirker, Sara Schmickle

    2008-01-01

    One contemporary artist that kindergarten students can easily relate to is Jasper Johns. In this article, the author discusses how she introduced John's numeric and alphabetic paintings to her kindergarten students. The young artists were amazed that art can be created from the familiar symbols that they are learning to make in their regular…

  18. John H. Reynolds (1923-2000)

    NASA Astrophysics Data System (ADS)

    Turner, Grenville

    John Reynolds, AGU Fellow since 1968 and a member of the Volcanology Geochemistry and Petrology section since 1961, died unexpectedly on November 4, 2000. John was a professor emeritus of physics at the University of California, Berkeley and a pioneer in the development and application of noble gas mass spectrometry He was recovering from pneumonia when he suffered a pulmonary embolism.

  19. John Kotter on Leadership, Management and Change.

    ERIC Educational Resources Information Center

    Bencivenga, Jim

    2002-01-01

    Excerpts from interview with John Kotter, Konosuke Matsushita Professor of Leadership at the Harvard Business School, about his thoughts on the role of the superintendent as leader and manager. Describes his recent book "John P. Kotter on What Leaders Really Do," 1999. Lists eight-step change process from his book "Leading Change," 1996. (PKP)

  20. Struggle for the Soul: John Lawrence Childs

    ERIC Educational Resources Information Center

    Stallones, Jared

    2010-01-01

    John Lawrence Childs was born in Eau Claire, Wisconsin on January 11, 1889, the second child of John Nelson Childs and Helen Janette (Nettie) Smith. In childhood Childs absorbed the values of industry, democracy, and a traditional, but socially conscious, religion. Childs was a Methodist and an intensely private person not given to talking about…

  1. John Henry--The Steel Driving Man

    ERIC Educational Resources Information Center

    Murphy, David E.; Gulley, Laura L.

    2005-01-01

    The story of John Henry provided the setting for sixth-grade class to participate in a John Henry Day of mathematics experiments. The students collected data from experiments where students competed against machines and technology. The student analyzed the data by comparing two box plots, a box plot of human data, and a box plot of machine or…

  2. John Bahcall and the Solar Neutrino Problem

    NASA Astrophysics Data System (ADS)

    Bahcall, Neta

    2016-03-01

    ``I feel like dancing'', cheered John Bahcall upon hearing the exciting news from the SNO experiment in 2001. The results confirmed, with remarkable accuracy, John's 40-year effort to predict the rate of neutrinos from the Sun based on sophisticated Solar models. What began in 1962 by John Bahcall and Ray Davis as a pioneering project to test and confirm how the Sun shines, quickly turned into a four-decade-long mystery of the `Solar Neutrino Problem': John's models predicted a higher rate of neutrinos than detected by Davis and follow-up experiments. Was the theory of the Sun wrong? Were John's calculations in error? Were the neutrino experiments wrong? John worked tirelessly to understand the physics behind the Solar Neutrino Problem; he led the efforts to greatly increase the accurately of the solar model, to understand its seismology and neutrino fluxes, to use the neutrino fluxes as a test for new physics, and to advocate for important new experiments. It slowly became clear that none of the then discussed possibilities --- error in the Solar model or neutrino experiments --- was the culprit. The SNO results revealed that John's calculations, and hence the theory of the Solar model, have been correct all along. Comparison of the data with John's theory demanded new physics --- neutrino oscillations. The Solar Neutrino saga is one of the most amazing scientific stories of the century: exploring a simple question of `How the Sun Shines?' led to the discovery of new physics. John's theoretical calculations are an integral part of this journey; they provide the foundation for the Solar Neutrino Problem, for confirming how the Sun shines, and for the need of neutrino oscillations. His tenacious persistence, dedication, enthusiasm and love for the project, and his leadership and advocacy of neutrino physics over many decades are a remarkable story of scientific triumph. I know John is smiling today.

  3. Photocopy of photograph (from Mrs. Martin, grandniece of John French, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of photograph (from Mrs. Martin, grandniece of John French, Clinton, Missouri) Circa 1900, photographer unknown JOHN AND ALMIRA FRENCH IN FRONT OF WEST AND SOUTH FACADES - John French Farm, South Grand River, Deepwater, Henry County, MO

  4. Strehl-constrained reconstruction of post-adaptive optics data and the Software Package AIRY, v. 6.1

    NASA Astrophysics Data System (ADS)

    Carbillet, Marcel; La Camera, Andrea; Deguignet, Jérémy; Prato, Marco; Bertero, Mario; Aristidi, Éric; Boccacci, Patrizia

    2014-08-01

    We first briefly present the last version of the Software Package AIRY, version 6.1, a CAOS-based tool which includes various deconvolution methods, accelerations, regularizations, super-resolution, boundary effects reduction, point-spread function extraction/extrapolation, stopping rules, and constraints in the case of iterative blind deconvolution (IBD). Then, we focus on a new formulation of our Strehl-constrained IBD, here quantitatively compared to the original formulation for simulated near-infrared data of an 8-m class telescope equipped with adaptive optics (AO), showing their equivalence. Next, we extend the application of the original method to the visible domain with simulated data of an AO-equipped 1.5-m telescope, testing also the robustness of the method with respect to the Strehl ratio estimation.

  5. Energy harvesting from sea waves with consideration of airy and JONSWAP theory and optimization of energy harvester parameters

    NASA Astrophysics Data System (ADS)

    Mirab, Hadi; Fathi, Reza; Jahangiri, Vahid; Ettefagh, Mir Mohammad; Hassannejad, Reza

    2015-12-01

    One of the new methods for powering low-power electronic devices at sea is a wave energy harvesting system. In this method, piezoelectric material is employed to convert the mechanical energy of sea waves into electrical energy. The advantage of this method is based on avoiding a battery charging system. Studies have been done on energy harvesting from sea waves, however, considering energy harvesting with random JONSWAP wave theory, then determining the optimum values of energy harvested is new. This paper does that by implementing the JONSWAP wave model, calculating produced power, and realistically showing that output power is decreased in comparison with the more simple airy wave model. In addition, parameters of the energy harvester system are optimized using a simulated annealing algorithm, yielding increased produced power.

  6. John Locke and the case of Anthony Ashley Cooper.

    PubMed

    Anstey, Peter R; Principe, Lawrence M

    2011-01-01

    In June 1668 Anthony Ashley Cooper, later to become the 1st Earl of Shaftesbury, underwent abdominal surgery to drain a large abscess above his liver. The case is extraordinary, not simply on account of the eminence of the patient and the danger of the procedure, but also because of the many celebrated figures involved. A trove of manuscripts relating to this famous operation survives amongst the Shaftesbury Papers in the National Archives at Kew. These include case notes in the hand of the philosopher John Locke and advice from leading physicians of the day including Francis Glisson, Sir George Ent and Thomas Sydenham. The majority of this material has never been published before. This article provides complete transcriptions and translations of all of these manuscripts, thus providing for the first time a comprehensive case history. It is prefaced with an extended introduction. PMID:22332471

  7. Medicine in John Locke's philosophy.

    PubMed

    Sanchez-Gonzalez, M A

    1990-12-01

    John Locke's philosophy was deeply affected by medicine of his times. It was specially influenced by the medical thought and practice of Thomas Sydenham. Locke was a personal friend of Sydenham, expressed an avid interest in his work and shared his views and methods. The influence of Sydenham's medicine can be seen in the following areas of Locke's philosophy: his "plain historical method"; the emphasis on observation and sensory experience instead of seeking the essence of things; the rejection of hypotheses and principles; the refusal of research into final causes and inner mechanisms; the ideal of irrefutable evidence and skepticism on the possibilities of certainty in science. The science which for Locke held the highest paradigmatic value in his theory of knowledge was precisely medicine. To a great extent, Locke's Essay on Human Understanding can be understood as an attempt to justify, substantiate, and promote Sydenham's medical method. This method, generalized, was then proposed as an instrument for the elaboration of all natural sciences. PMID:2290077

  8. John Keats: poet, patient, physician.

    PubMed

    Smith, H

    1984-01-01

    John Keats, son of an ostler , was born in London in 1795. Despite an early interest in literature he was, surprisingly, apprenticed to an apothecary and continued his medical training at Guy's Hospital, obtaining the Licentiate of the Society of Apothecaries in 1816. He never practiced medicine. His early poems were not well received, and for the young poet with very slender means, life was difficult. Tragedy was added to difficulty when tuberculosis, which had already caused the death of his mother and uncle, became apparent in his brother Tom, whom Keats nursed through his illness when the brothers were living together in Hampstead . Subsequently Keats developed the disease, but despite its rapid progress, he managed in a single year - 1819 - to produce some of the finest lyrical poetry in the language. He went to Italy in the hope of obtaining a cure but died in Rome in 1821, aged 25. Medicine certainly contributed to the man, but also something to the poet, Keats; his training and his family and personal experience of tuberculosis speak for themselves. More subtly , his medical experience influenced in some degree his ideas and even his choice of words. The interrelations of poet-patient and trainee-physician are examined in this essay. PMID:6377444

  9. Obituary: John P. Davidson (1924-2010)

    NASA Astrophysics Data System (ADS)

    Twarog, Bruce; Anthony-Twarog, Barbara

    2011-12-01

    Nuclear physicist and astrophysicist John P. Davidson died at his home on January 10, 2010. He was born on July 22, 1924 in Los Angeles, California. Jack followed his high school interests in rocketry and physical science to the University of California, Berkeley, where he earned a Bachelor of Science degree in physics in June 1948 after serving a stint from 1943 to 1946 in the Army Signal Corps in the European Theater of Operations. Following the war and graduation, Jack embarked on a graduate career in nuclear physics at Washington University, St. Louis. While there, he also initiated what became a life-long partnership with Mary Reiser dedicated to issues of social justice by co-founding an organization to lobby for university admission of African-American students, a policy change opposed by physicist and Chancellor, Arthur Holly Compton. Mary and Jack married in 1949. Jack Davidson's academic career began shortly after completion of his PhD in 1952 under Eugene Feenberg. He taught in Brazil and in Norway before becoming an assistant professor at Rensselaer Polytechnic Institute in 1957. He stayed at RPI until 1966, at which time he joined the faculty of the University of Kansas where he served faculty and students until his retirement in 1996. His teaching, research and administrative career at KU was distinguished by a growing commitment to the astronomy and astrophysics program. Not only did he foster its growth during his tenure as department chair (1977-1989), he directed a residential summer science program in astronomy for high school students at KU for nearly 10 years in the 1970's. He combined his background in nuclear physics and his fascination with astrophysics into a research program to study elemental abundance anomalies in stellar spectra, authoring with Don Bord several pioneering applications of wavelength coincidence statistics to the ultraviolet spectra of peculiar A stars. At KU, Jack assumed leadership roles in the local chapter of Phi Beta

  10. Archival Footage: John Glenn's Mercury Flight

    NASA Video Gallery

    Archival films document John Glenn's historic Feb. 20, 1962 Mercury flight in his Friendship 7, in which he became the first American to orbit the Earth. Clips include boarding the capsule, splashd...

  11. Obituary: John Louis Perdrix (1926-2005)

    NASA Astrophysics Data System (ADS)

    Orchiston, W.

    2005-12-01

    On 27 June 2005 the Journal of Astronomical History and Heritage lost its founder and Australia lost one of its leading historians of astronomy when John Louis Perdrix died in Dubai after a brief battle with cancer.

  12. John Dewey--Philosopher and Educational Reformer

    ERIC Educational Resources Information Center

    Talebi, Kandan

    2015-01-01

    John Dewey was an American philosopher and educator, founder of the philosophical movement known as pragmatism, a pioneer in functional psychology, and a leader of the progressive movement in education in the United States.

  13. Corporate Perspective: An Interview with John Sculley.

    ERIC Educational Resources Information Center

    Temares, M. Lewis

    1989-01-01

    John Sculley, the chairman of the board of Apple Computer, Inc., discusses information technology management, management strategies, network management, the Chief Information Officer, strategic planning, back-to-the-future planning, business and university joint ventures, and security issues. (MLW)

  14. John Peter Zenger, Battler for Freedom

    ERIC Educational Resources Information Center

    Wallerstein, Gerry

    1974-01-01

    Examines the freedom of the press precedent set by the John Peter Zenger case in 1743 and considers its application to such current events as the jailing of reporters for not disclosing news sources. (RB)

  15. John Twysden and John Palmer: 17th-century Northamptonshire astronomers

    NASA Astrophysics Data System (ADS)

    Frost, M. A.

    2008-01-01

    John Twysden (1607-1688) and John Palmer (1612-1679) were two astronomers in the circle of Samuel Foster (circa 1600-1652), the subject of a recent paper in this journal. John Twysden qualified in law and medicine and led a peripatetic life around England and Europe. John Palmer was Rector of Ecton, Northamptonshire and later Archdeacon of Northampton. The two astronomers catalogued observations made from Northamptonshire from the 1640s to the 1670s. In their later years Twysden and Palmer published works on a variety of topics, often astronomical. Palmer engaged in correspondence with Henry Oldenburg, the first secretary of the Royal Society, on topics in astronomy and mathematics.

  16. John F. Kennedy Space Center

    NASA Technical Reports Server (NTRS)

    2006-01-01

    The John F. Kennedy Space Center, America's spaceport, is located along Florida's eastern shore on Cape Canaveral. Established as NASA's Launch Operations Center on July 1, 1962, the center has been the site of launching all U.S. human space flight missions, from the early days of Project Mercury to the space shuttle and the next generation of vehicles. In addition, the center is home to NASA's Launch Services Program, which coordinates all expendable vehicle launches carrying a NASA payload.

    With its 14 spectral bands from the visible to the thermal infrared wavelength region, and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), ASTER images Earth to map and monitor the changing surface of our planet.

    ASTER is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products.

    The broad spectral coverage and high spectral resolution of ASTER provides scientists in numerous disciplines with critical information for surface mapping, and monitoring of dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance.

    The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

    Size: 32.6 by 51.2 kilometers (20.2 by 32.2 miles) Location: 28.6 degrees North latitude, 80.6 degrees West longitude Orientation: North at top Image Data: ASTER bands 3, 2, and 1 Original Data Resolution: 15 meters (49

  17. Clinical Problem Solving: The Case of John, Part III

    ERIC Educational Resources Information Center

    Drell, Martin J.; Josephson, Allan; Pleak, Richard; Riggs, Paula; Rosenfeld, Alvin

    2006-01-01

    In this article, the authors share the case of John, a college freshman who had been struggling with depression. To work around John's case, the authors conducted an interview with John's parents. Based on the interview, it is found out that John's depression was largely caused by his relationship with his parents and the environment at their…

  18. 78 FR 43187 - PacifiCorp, St. Anthony Hydro LLC; Notice of Application Accepted for Filing, Soliciting Comments...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-19

    ... Energy Regulatory Commission PacifiCorp, St. Anthony Hydro LLC; Notice of Application Accepted for Filing..., 2013. d. Applicants: PacifiCorp (transferor) and St. Anthony Hydro LLC (transferee). e. Name of Project.... g. Filed Pursuant to: Federal Power Act, 16 U.S.C. 791a-825r. h. Applicants Contact: Mr. John...

  19. Obituary: John W. Firor (1927-2007)

    NASA Astrophysics Data System (ADS)

    Gilman, Peter A.

    2009-12-01

    John W. Firor, a former Director of the High Altitude Observatory and the National Center for Atmospheric Research, and a founder of the Solar Physics Division of the American Astronomical Society, died of Alzheimer's disease in Pullman, Washington on November 5, 2007, he was 80. He was born in Athens Georgia on October 18, 1927, where his father was a professor of agricultural economics. John had an unusually diverse scientific career. His interest in physics and astrophysics began while serving in the army, during which time he was assigned to the Los Alamos National Laboratory, where he guarded highly radioactive materials (many have heard him describe how informal the protections were compared to later times). After his service he returned to college and graduated in physics from Georgia Tech in 1949. He received his Ph.D. from the University of Chicago in 1954, writing his thesis on cosmic rays under John Simpson. John Firor would later remark that: "If you needed cosmic rays to actually do anything, you are sunk." That thought, partly in jest, may help explain his motivation for moving to so many new scientific and management pursuits. John moved from cosmic ray physics to radio astronomy (particularly of the Sun) when he began work at the Carnegie Institution of Washington's Department of Terrestrial Magnetism, where he remained until 1961. During this time, he met Walter Orr Roberts, then the Director of the High Altitude Observatory (HAO) in Boulder, Colorado. HAO was then affiliated with the University of Colorado. In 1959, a movement began to upgrade the atmospheric sciences in the United States by establishing a National Center, where the largest, most important atmospheric research problems could be addressed. Roberts became the first Director of NCAR, as well as the first president of the University Corporation for Atmospheric Research (UCAR), the consortium of universities that was commissioned to manage and staff the new Center. HAO became a

  20. Exceptional Scholarship and Democratic Agendas: Interviews with John Goodlad, John Hoyle, Joseph Murphy, and Thomas Sergiovanni

    ERIC Educational Resources Information Center

    Mullen, Carol A.

    2006-01-01

    This portraiture study of four exceptional scholars in education--John Goodlad, John Hoyle, Joseph Murphy, and Thomas Sergiovanni--provides insight into their scholarly work and life habits, direction and aspirations, assessment and analysis of major trends in the profession, and advice for aspiring leaders and academics. Telephone interviews with…

  1. Exceptional Scholarship and Democratic Agendas: Interviews with John Goodlad, John Hoyle, Joseph Murphy, and Thomas Sergiovanni

    ERIC Educational Resources Information Center

    Mullen, Carol A.

    2009-01-01

    This portraiture study of four exceptional scholars in education--John Goodlad, John Hoyle, Joseph Murphy, and Thomas Sergiovanni--provides insight into their scholarly work and life habits, direction and aspirations, assessment and analysis of major trends in the profession, and advice for aspiring leaders and academics. Telephone interviews with…

  2. Conceptions of Childhood in the Educational Philosophies of John Locke and John Dewey

    ERIC Educational Resources Information Center

    Bynum, Gregory Lewis

    2015-01-01

    This article compares progressive conceptions of childhood in the educational philosophies of John Locke and John Dewey. Although the lives of the two philosophers were separated by an ocean and two centuries of history, they had in common the following things: (1) a relatively high level of experience working with, and observing, children that is…

  3. Astronomy Behind Enemy Lines in Colonial North America: John Winthrop's Observations of the Transits of Venus

    NASA Astrophysics Data System (ADS)

    Schechner, S. J.

    2005-12-01

    In May 1761, John Winthrop packed up two students, an excellent clock, an octant, and two telescopes, and embarked for Newfoundland to observe the Transit of Venus. Winthrop's departure was hasty. Only days before had the President and Fellows of Harvard College approved Professor Winthrop's request to take the college apparatus behind enemy lines to serve the cause of science, and Winthrop knew he had no time to waste if he were to reach Newfoundland and properly calibrate his equipment before the Transit. Winthrop's expedition to St. John's, Newfoundland was nothing short of remarkable. His goal was to help determine the distance from the Earth to the Sun, and he was the only North American astronomer fit for this project. His expedition was financed by the General Court of Massachusetts, which also secured him safe passage across enemy lines during the French and Indian War. Winthrop's trip to St. John's was a major achievement for colonial astronomy, but he was unhappy with his observations and so looked forward to a second chance to observe a transit in 1769. Benjamin Franklin urged him to go to Lake Superior. Planning for that transit was thwarted, however, by two events: (1) the loss of nearly all of Harvard's apparatus in a fire of 1764; and (2) pre-Revolutionary politics in the American colonies. In the end, Winthrop was forced to content himself with first-class observations with new instruments in Cambridge.

  4. Press Site Auditorium dedicated to John Holliman

    NASA Technical Reports Server (NTRS)

    1999-01-01

    From left, Center Director Roy Bridges and NASA Administrator Daniel S. Goldin applaud as Jay Holliman, with the help of his mother, Mrs. Dianne Holliman, unveils a plaque honoring his father, the late John Holliman. At right is Tom Johnson, news group chairman of CNN. The occasion was the dedication of the KSC Press Site auditorium as the John Holliman Auditorium to honor the CNN national correspondent for his enthusiastic, dedicated coverage of America's space program. The auditorium was built in 1980 and has been the focal point for new coverage of Space Shuttle launches. The ceremony followed the 94th launch of a Space Shuttle, on mission STS-96, earlier this morning.

  5. Press Site Auditorium dedicated to John Holliman

    NASA Technical Reports Server (NTRS)

    1999-01-01

    NASA Administrator Daniel S. Goldin hands Mrs. Dianne Holliman a plaque honoring her late husband, John Holliman, a CNN national correspondent. Standing behind Goldin is Center Director Roy Bridges. At right is Tom Johnson, news group chairman of CNN. A ceremony dedicated the KSC Press Site auditorium as the John Holliman Auditorium to honor the correspondent for his enthusiastic, dedicated coverage of America's space program. The auditorium was built in 1980 and has been the focal point for new coverage of Space Shuttle launches. The ceremony followed the 94th launch of a Space Shuttle, on mission STS-96, earlier this morning.

  6. Sir John Gurdon: father of nuclear reprogramming.

    PubMed

    Blau, Helen M

    2014-07-01

    Sir John Gurdon founded the field of nuclear reprogramming. His work set the stage for the ever burgeoning area of stem cell biology and regenerative medicine. Here I provide personal reflections on times I shared with John Gurdon and professional reflections of the impact of his ground-breaking research on my own development as a scientist and on the field in general. His paradigm-shifting experiments will continue to provoke scientists to think outside the box for many years to come. PMID:24954777

  7. Sir John Gurdon: Father of nuclear reprogramming

    PubMed Central

    Blau, Helen M.

    2015-01-01

    Sir John Gurdon founded the field of nuclear reprogramming. His work set the stage for the ever burgeoning area of stem cell biology and regenerative medicine. Here I provide personal reflections on times I shared with John Gurdon and professional reflections of the impact of his ground-breaking research on my own development as a scientist and on the field in general. His paradigm-shifting experiments will continue to provoke scientists to think outside the box for many years to come. PMID:24954777

  8. Astronaut John Glenn Enters Friendship 7

    NASA Technical Reports Server (NTRS)

    1962-01-01

    Astronaut John Glenn enters the Mercury spacecraft, Friendship 7, prior to the launch of MA-6 on February 20, 1961 and became the first American who orbited the Earth. The MA-6 mission was the first manned orbital flight boosted by the Mercury-Atlas vehicle, a modified Atlas ICBM (Intercontinental Ballistic Missile), lasted for five hours, and orbited the Earth three times.

  9. Press Site Auditorium dedicated to John Holliman

    NASA Technical Reports Server (NTRS)

    1999-01-01

    A ceremony dedicated the KSC Press Site auditorium as the John Holliman Auditorium to honor the correspondent for his enthusiastic, dedicated coverage of America's space program. The auditorium was built in 1980 and has been the focal point for new coverage of Space Shuttle launches. The ceremony followed the 94th launch of a Space Shuttle, on mission STS-96, earlier this morning.

  10. John M. Neale (1943-2011).

    PubMed

    Oltmanns, Thomas F; Kring, Ann M

    2012-09-01

    Presents an obituary for John M. Neale. Neale died in Hilton Head, South Carolina, on November 19, 2011, after a long illness. He was born on August 31, 1943, in Toronto, Canada. He received his bachelor's degree from the University of Toronto in 1965, where his interest in psychology had been sparked by an introductory course taught by George Mandler. After working at a residential treatment center for emotionally disturbed children, he decided to pursue graduate training in clinical psychology and enrolled at Vanderbilt University. Rue Cromwell served as John's mentor and stimulated his interest in the investigation of perception and cognition in schizophrenia. His doctorate was awarded in 1969, after completion of his internship at the Langley Porter Neuropsychiatric Institute in San Francisco. John was hired in 1969 as an assistant professor in the new and exciting psychology department (founded in 1965) at the State University of New York at Stony Brook. That department remained his academic home for his entire career. Outside of his academic pursuits, John was an avid New York Giants fan, an extensive traveler, an excellent skier and tennis player, a music lover and jukebox collector, an outstanding cook, a terrific dancer, and a devoted dog owner. He continued to pursue these interests throughout his life, taking cooking classes, traveling to exotic locales with his wife Gail, and, when his health precluded more rigorous athletic pursuits, faithfully walking and playing with his dogs. PMID:22963420

  11. John Dewey and Adult Learning in Museums

    ERIC Educational Resources Information Center

    Monk, David F.

    2013-01-01

    The objective of this article is to investigate learning in museums through the lens of John Dewey's philosophy of education and experiential learning. The influence of Dewey's philosophy of education is widespread and resounding. In this article, I examine the experiential qualities of Dewey's philosophy and compare it with the objectives of the…

  12. Three Gentlemen of NAIS: John Chandler

    ERIC Educational Resources Information Center

    Potter, Cary

    1981-01-01

    Describes the many contributions of John Chandler in his 15 years at the National Association of Independent Schools (NAIS); cites his concern with the nature and problems of school administration and describes some of the developments at NAIS under his direction; notes his family background. (SB)

  13. An Interview with John Trim at 80

    ERIC Educational Resources Information Center

    Saville, Nick

    2005-01-01

    This article presents an interview with Dr. John Trim, which was recorded at his home in Cambridge on January 21, 2005, not long after his 80th birthday in October 2004. Although he would not consider himself a language tester, Dr. Trim has followed the trends in language assessment since the 1960s and his own work, particularly as a coauthor of…

  14. John Wilkes Booth and the Lincoln Conspiracy.

    ERIC Educational Resources Information Center

    Nufrio, Ronald M.

    The 1865 conspiracy to assassinate Abraham Lincoln also included plans to assassinate other government officials on that same April evening. The actor, John Wilkes Booth, succeeded in killing Lincoln, but his fellow conspirators bungled their attempts to kill William Seward, Andrew Johnson, Ulysses S. Grant, and possibly Edwin Stanton. In…

  15. John Robinson: Sustainer of the Pilgrimage.

    ERIC Educational Resources Information Center

    Marks, Gary L.

    1991-01-01

    Contends that, although Pilgrim leader John Robinson never traveled to North America, he personified the sense of purpose that held the pilgrimage together through trials, failures, and harassments. Discusses the history and issues of separatism during the development of the Puritan church in England and the Netherlands. (DK)

  16. Speaking Personally--With John Seely Brown

    ERIC Educational Resources Information Center

    American Journal of Distance Education, 2008

    2008-01-01

    This article presents an interview with John Seely Brown, a visiting scholar at the University of Southern California and a former chief scientist of Xerox Corporation and director of its Palo Alto Research Center (PARC)--a position he held for nearly two decades. While head of PARC, Brown expanded the role of corporate research to include such…

  17. John Dewey on Philosophy and Childhood

    ERIC Educational Resources Information Center

    Gregory, Maughn; Granger, David

    2012-01-01

    John Dewey was not a philosopher of education in the now-traditional sense of a doctor of philosophy who examines educational ends, means, and controversies through the disciplinary lenses of epistemology, ethics, and political theory, or of agenda-driven schools such as existentialism, feminism, and critical theory. Rather, Dewey was both an…

  18. John Wilson on the Necessity of Punishment.

    ERIC Educational Resources Information Center

    Marshall, James D.

    1984-01-01

    According to John Wilson, the punishment of children is logically necessary, or inevitable, and punishment is the necessary concommitant of serious education. It is argued here that Wilson has not successfully established his case for the necessity of the punishment of children. (RM)

  19. John Paul College: The Professional Renewal Journey

    ERIC Educational Resources Information Center

    Mundie, Pauline; Marr, Robert

    2014-01-01

    John Paul College, a K-12 School in Queensland, Australia, recognises the centrality of classroom teachers to the ongoing improvement of student outcomes. The College has implemented a multi-tiered "professional renewal and assessment process." These changes of emphasis are the result of significant research and subsequent/associated…

  20. Whole Genome Association Study of Johne's Disease

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Bovine Paratuberculosis, commonly referred to as Johne's disease, is a contagious bacterial disease estimated to be present in over 65% of US dairy herds and results in annual losses in the hundreds of millions of US dollars. Mycobacterium avium subspecies paratuberculosis (MAP) is the bacteria resp...

  1. John Furlong and the "University Project"

    ERIC Educational Resources Information Center

    Watson, David

    2014-01-01

    Like many senior teacher-educators and educational researchers, John Furlong has faced in several directions throughout his career, sometimes simultaneously. He has clearly not lost his enthusiasm for what happens in the classroom: he strongly appreciates those magical moments which can happen at any time, and which keep teachers going. He loves…

  2. John Todd--Numerical Mathematics Pioneer

    ERIC Educational Resources Information Center

    Albers, Don

    2007-01-01

    John Todd, now in his mid-90s, began his career as a pure mathematician, but World War II interrupted that. In this interview, he talks about his education, the significant developments in his becoming a numerical analyst, and the journey that concluded at Caltech. Among the interesting stories are how he met his wife-to-be the mathematician Olga…

  3. Speaking Personally--With John "Pathfinder" Lester

    ERIC Educational Resources Information Center

    Beaubois, Terry

    2013-01-01

    John Lester is currently the chief learning officer at ReactionGrid, a software company developing 3-D simulations and multiuser virtual world platforms. Lester's background includes working with Linden Lab on Second Life's education activities and neuroscience research. His primary focus is on collaborative learning and instructional…

  4. We, John Dewey's Audience of Today

    ERIC Educational Resources Information Center

    da Cunha, Marcus Vinicius

    2016-01-01

    This article suggests that John Dewey's "Democracy and Education" does not describe education in an existing society, but it conveys a utopia, in the sense coined by Mannheim: utopian thought aims at instigating actions towards the transformation of reality, intending to attain a better world in the future. Today's readers of Dewey (his…

  5. John W. Thoburn: International Humanitarian Award

    ERIC Educational Resources Information Center

    American Psychologist, 2012

    2012-01-01

    Presents a short biography of the winner of the American Psychological Association's International Humanitarian Award. The 2012 winner, John W. Thoburn, is an extraordinary psychologist who devotes himself consistently to service to underserved populations, especially in the aftermath of natural or human-induced disasters. He exemplifies a genuine…

  6. John Hull and the Money Culture

    ERIC Educational Resources Information Center

    Attfield, David

    2008-01-01

    John Hull's recent educational writings have included several on what he calls the "money culture". This is analysed and criticised in this article. Hull offers a Marxist and a neo-Marxist account of the role of money in western societies utilising the labour theory of value, false consciousness and the materialist interpretation of history. It is…

  7. A Posthumous Dialogue with John Nicolis: IERU

    NASA Astrophysics Data System (ADS)

    Rössler, Otto E.

    2014-12-01

    The reader is taken into the heart of a fictitious dialogue between two friends who never talked long enough with each other during the lifetime of both. It is the fearlessness of the mind of John that prompted the hopefully not too erratic thoughts that are going to be offered. The central figure is Heraclitus, the Great.

  8. Jean Piaget's Debt to John Dewey

    ERIC Educational Resources Information Center

    Tanner, Daniel

    2016-01-01

    Jean Piaget became a veritable institution unto himself in education and psychology, largely as the result of his developmental-stage theory advanced over the second quarter of the twentieth century. Not until Piaget was 73 did he make mention of John Dewey's work at Dewey's laboratory school, founded in 1894 at the University of Chicago. But here…

  9. Astronaut Virgil Grissom and Astronaut John Glenn

    NASA Technical Reports Server (NTRS)

    1961-01-01

    Astronaut Virgil Grissom chats with Astronaut John Glenn prior to entering the Liberty Bell 7 capsule for the MR-4 Mission. The MR-4 mission was the second manned suborbital flight using the Mercury-Redstone booster, which was developed by the Marshall Space Flight Center.

  10. Transcriptional profiling of bovine Johne's Disease

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Johne's Disease is a chronic, contagious disease prevalent in ruminants. The animal is infected early in life by the bacteria Mycobacterium avium subsp. paratuberculosis (MAP). The characteristic symptoms of rapid weight loss and diarrhea may not appear for years after infection. We investigated t...

  11. An Interview with John H. Ritter.

    ERIC Educational Resources Information Center

    Crowe, Chris

    2000-01-01

    Presents an interview with John H. Ritter discussing his life, his books, his views on sports literature, and a variety of other subjects. Discusses in particular his two novels "Choosing Up Sides," and "Over the Wall." Describes how he uses baseball scenes as metaphors to depict difficult choices that kids are dealing with. (SC)

  12. Capitalism in Six Westerns by John Ford

    ERIC Educational Resources Information Center

    Braun, Carlos Rodriguez

    2011-01-01

    The economic and institutional analysis of capitalism can be illustrated through John Ford's Westerns. This article focuses on six classics by Ford that show the move toward modern order, the creation of a new society, and the rule of law. Economic features are pervading, from property rights and contracts to markets, money, and trade. Ford has…

  13. John Ogbu and Minority Education in Japan

    ERIC Educational Resources Information Center

    Okubo, Yuko

    2006-01-01

    This paper discusses John Ogbu and his work in the context of Japan. First, his interest in Japan, his interactions with Japanese educators and researchers, and their responses to his work are discussed. Then Ogbu's cultural model from the author's fieldwork experiences is examined and a relational and dialectic perspective is proposed to study…

  14. John B. Watson's Legacy: Learning and Environment.

    ERIC Educational Resources Information Center

    Horowitz, Frances Degen

    1992-01-01

    Evaluates John B. Watson's contributions to developmental psychology. Watson's insistence on objective methodology in psychology retains its influence, but his extreme environmentalism has been rejected. His concern with the principles of learning is reflected in the work of Hull and Skinner. (BC)

  15. The Life and Work of John Snow

    ERIC Educational Resources Information Center

    Melville, Wayne; Fazio, Xavier

    2007-01-01

    Due to his work to determine how cholera was spread in the 18th century, John Snow (1813-1858) has been hailed as the father of modern epidemiology. This article presents an inquiry model based on his life and work, which teachers can use to develop a series of biology lessons involving the history and nature of science. The lessons presented use…

  16. Prostate Cancer Research Trial Helps John Spencer Treat His Cancer

    MedlinePlus

    ... please turn Javascript on. Feature: Prostate Cancer Prostate Cancer Research Trial Helps John Spencer Treat His Cancer Past ... Prostate Cancer" Articles Progress Against Prostate Cancer / Prostate Cancer Research Trial Helps John Spencer Treat His Cancer / Prostate ...

  17. Fastballs a Fast Track to 'Tommy John Surgery'?

    MedlinePlus

    ... 159058.html Fastballs a Fast Track to 'Tommy John Surgery'? Other pitches not linked to the elbow ... pitcher's risk of an elbow injury requiring "Tommy John surgery." "Our findings suggest that throwing a high ...

  18. 4. VIEW OF JOHN HOPE HOMES LOOKING SOUTHEAST THROUGH BLOCK ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW OF JOHN HOPE HOMES LOOKING SOUTHEAST THROUGH BLOCK C FROM ROOFTOP OF COMMUNITY BUILDING. - John Hope Homes (Public Housing), Bounded by Larkin, Dora, Spelman Streets & Lane, Atlanta, Fulton County, GA

  19. 6. VIEW OF JOHN HOPE HOMES LOOKING NORTHWEST THROUGH COMMUNITY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW OF JOHN HOPE HOMES LOOKING NORTHWEST THROUGH COMMUNITY PORCH AT FRONT COURTYARD IN BLOCK C. - John Hope Homes (Public Housing), Bounded by Larkin, Dora, Spelman Streets & Lane, Atlanta, Fulton County, GA

  20. 2. VIEW OF JOHN HOPE HOMES LOOKING NORTHEAST UP NORTHSIDE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW OF JOHN HOPE HOMES LOOKING NORTHEAST UP NORTHSIDE DRIVE FROM INTERSECTION OF LEONARD STREET AND NORTHSIDE DRIVE. - John Hope Homes (Public Housing), Bounded by Larkin, Dora, Spelman Streets & Lane, Atlanta, Fulton County, GA

  1. 1. VIEW OF JOHN HOPE HOMES LOOKING EAST TOWARD NORTHSIDE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. VIEW OF JOHN HOPE HOMES LOOKING EAST TOWARD NORTHSIDE DRIVE FROM INTERSECTION OF GREENSFERRY AVENUE AND DORA STREET. - John Hope Homes (Public Housing), Bounded by Larkin, Dora, Spelman Streets & Lane, Atlanta, Fulton County, GA

  2. 3. VIEW OF JOHN HOPE HOMES LOOKING WEST FROM INTERSECTION ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW OF JOHN HOPE HOMES LOOKING WEST FROM INTERSECTION OF NORTHSIDE DRIVE AND MCDANIEL STREET TOWARD BLOCK B. - John Hope Homes (Public Housing), Bounded by Larkin, Dora, Spelman Streets & Lane, Atlanta, Fulton County, GA

  3. 68. Historic American Buildings Survey John O. Brostrup, Photographer August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    68. Historic American Buildings Survey John O. Brostrup, Photographer August 27, 1936 8:15 A. M. FINDINGS IN MASON HOUSE RUINS. - General John Mason House, Analostan Island or Theodore Roosevelt Island, Washington, District of Columbia, DC

  4. 69. Historic American Buildings Survey John O. Brostrup, Photographer August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    69. Historic American Buildings Survey John O. Brostrup, Photographer August 27, 1936 8:10 A. M. DETAIL OF FINDINGS IN MASON HOUSE RUINS. - General John Mason House, Analostan Island or Theodore Roosevelt Island, Washington, District of Columbia, DC

  5. SUSPENSION BRIDGE BETWEEN THE OFFICE JOHN A. ROEBLING SONS COMPANY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    SUSPENSION BRIDGE BETWEEN THE OFFICE JOHN A. ROEBLING SONS COMPANY AND THEIR RESEARCH LABORATORY BUILDING - John A. Roebling's Sons Company & American Steel & Wire Company, South Broad, Clark, Elmer, Mott & Hudson Streets, Trenton, Mercer County, NJ

  6. John Moulton Homestead, water channel with board cover for walkway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    John Moulton Homestead, water channel with board cover for walkway to house, looking east - John Moulton Homestead, Northwest corner of Mormon Row Road and Antelope Flats Road, Kelly, Teton County, WY

  7. 1. Historic American Buildings Survey John O. Brostrup, Photographer April ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Historic American Buildings Survey John O. Brostrup, Photographer April 2, 1937 10:25 A.M. VIEW FROM SOUTHEAST (front). - Colonel John Cox House, 3339 N Street, Northwest, Washington, District of Columbia, DC

  8. 3. Historic American Buildings Survey John O. Brostrup, Photographer April ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Historic American Buildings Survey John O. Brostrup, Photographer April 2, 1937 10:40 A.M. DETAIL OF ENTRANCE (south elevation). - Colonel John Cox House, 3339 N Street, Northwest, Washington, District of Columbia, DC

  9. Obituary: John J. Hillman, 1938-2006

    NASA Astrophysics Data System (ADS)

    Chanover, Nancy

    2007-12-01

    John J. Hillman, a dedicated NASA civil servant, spectroscopist, astrophysicist, planetary scientist, and mentor, died on February 12, 2006 of ocular melanoma at his home in Columbia, Maryland. His professional and personal interests were wide-reaching and varied, and he devoted his career to the advancement of our understanding of the beauty and wonder in the world around us. His love of nature, art, and science made him a true Renaissance man. John was born in Fort Jay, New York, on November 22, 1938, and was raised in Washington, D.C. He received his B.S., M.S., and Ph.D. degrees in Physics from American University in 1967, 1970, and 1975, respectively. He began working at NASA's Goddard Space Flight Center, then in its infancy, in 1969, juggling a full-time position as a Research Physicist, the completion of his M.S. and Ph.D. degrees, and a young family. His background in molecular spectroscopy enabled him to apply his skills to numerous disciplines within NASA: infrared and radio astronomy; electronic, vibrational, and rotational structure of interstellar molecules; solar and stellar atmospheres; and planetary atmospheres. He published more than 70 journal papers in these disciplines. He was a frequent contributor to the Ohio State University International Symposium on Molecular Spectroscopy, and possessed a rare ability to bridge the gap between laboratory and remote sensing spectroscopy, bringing scientists from different disciplines together to understand our Universe. The last fifteen years of John's career were devoted to the development of acousto-optic tunable filter (AOTF) cameras. He championed this technology as a low-cost, low-power alternative to traditional imaging cameras for in situ or remotely sensed planetary exploration. It was within this context that I got to know John, and eventually worked closely with him on the demonstration and application of this technology for planetary science using ground-based telescopes in New Mexico, California

  10. 7. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. John and James Dobson Carpet Mill, East and West Parcels, May 17, 1926, (John and James Dobson, Inc. East Falls, Aero Service Corp., Neg. No. 5986, May 17, 1926, Free Library of Philadelphia, Print Collection). - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  11. Model of a tunneling current in a p-n junction based on armchair graphene nanoribbons - an Airy function approach and a transfer matrix method

    SciTech Connect

    Suhendi, Endi; Syariati, Rifki; Noor, Fatimah A.; Khairurrijal; Kurniasih, Neny

    2014-03-24

    We modeled a tunneling current in a p-n junction based on armchair graphene nanoribbons (AGNRs) by using an Airy function approach (AFA) and a transfer matrix method (TMM). We used β-type AGNRs, in which its band gap energy and electron effective mass depends on its width as given by the extended Huckel theory. It was shown that the tunneling currents evaluated by employing the AFA are the same as those obtained under the TMM. Moreover, the calculated tunneling current was proportional to the voltage bias and inversely with temperature.

  12. 76 FR 26767 - Captain John Smith Chesapeake National Historic Trail Advisory Council

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-09

    ... National Park Service Captain John Smith Chesapeake National Historic Trail Advisory Council AGENCY... Captain John Smith Chesapeake National Historic Trail will hold a meeting. Designated through an amendment... John Maounis, Superintendent, Captain John Smith National Historic Trail, telephone: (410)...

  13. 76 FR 52691 - Captain John Smith Chesapeake National Historic Trail Advisory Council

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-23

    ... National Park Service Captain John Smith Chesapeake National Historic Trail Advisory Council AGENCY... Captain John Smith Chesapeake National Historic Trail will hold a meeting. Designated through an amendment... John Maounis, Superintendent, Captain John Smith National Historic Trail, telephone: (410)...

  14. 77 FR 12324 - Captain John Smith Chesapeake National Historic Trail Advisory Council

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-29

    ... National Park Service Captain John Smith Chesapeake National Historic Trail Advisory Council AGENCY... Captain John Smith Chesapeake National Historic Trail will hold a meeting. Designated through an amendment... John Maounis, Superintendent, Captain John Smith National Historic Trail, telephone: (410)...

  15. Obituary: John W. Firor (1927-2007)

    NASA Astrophysics Data System (ADS)

    Gilman, Peter A.

    2009-12-01

    John W. Firor, a former Director of the High Altitude Observatory and the National Center for Atmospheric Research, and a founder of the Solar Physics Division of the American Astronomical Society, died of Alzheimer's disease in Pullman, Washington on November 5, 2007, he was 80. He was born in Athens Georgia on October 18, 1927, where his father was a professor of agricultural economics. John had an unusually diverse scientific career. His interest in physics and astrophysics began while serving in the army, during which time he was assigned to the Los Alamos National Laboratory, where he guarded highly radioactive materials (many have heard him describe how informal the protections were compared to later times). After his service he returned to college and graduated in physics from Georgia Tech in 1949. He received his Ph.D. from the University of Chicago in 1954, writing his thesis on cosmic rays under John Simpson. John Firor would later remark that: "If you needed cosmic rays to actually do anything, you are sunk." That thought, partly in jest, may help explain his motivation for moving to so many new scientific and management pursuits. John moved from cosmic ray physics to radio astronomy (particularly of the Sun) when he began work at the Carnegie Institution of Washington's Department of Terrestrial Magnetism, where he remained until 1961. During this time, he met Walter Orr Roberts, then the Director of the High Altitude Observatory (HAO) in Boulder, Colorado. HAO was then affiliated with the University of Colorado. In 1959, a movement began to upgrade the atmospheric sciences in the United States by establishing a National Center, where the largest, most important atmospheric research problems could be addressed. Roberts became the first Director of NCAR, as well as the first president of the University Corporation for Atmospheric Research (UCAR), the consortium of universities that was commissioned to manage and staff the new Center. HAO became a

  16. Political Action, Public Policy and Catholic Schools. Catholic Schools for the 21st Century. [Volume VI.

    ERIC Educational Resources Information Center

    Coons, John E.; Monahan, Frank J.

    Part of a six volume series of theme papers commissioned for the National Congress on Catholic Schools for the 21st century, November 6-10, 1991, two papers are included in this volume. In "The Catholic School and the Common Good," John Coons has two objectives: (1) to describe the secular and religious roles of the Catholic school within the…

  17. John Holt Stanway: Gone to Texas

    NASA Astrophysics Data System (ADS)

    Bryan, J.

    2008-01-01

    John Holt Stanway (1799Ð1872) was an amateur astronomer who lived in Manchester, England until 1845. He was in contact with the English Ôgrand amateurÕ astronomer, William Henry Smyth, who supported him for Fellowship of the Royal Astronomical Society and evidently advised him on how to build and equip an observatory. Apparently, Stanway had an observatory at Chorlton-cum-Hardy in 1837. In 1845, Stanway left for the United States in response to serious business problems. En route, he met Ashbel Smith, a representative of the government of the Republic of Texas, who convinced Stanway to go to Texas. There he changed his name to John H. Smythe Stanley and settled in Houston, where he re-established his observatory. He became a commercial photographer and wrote about astronomy and other scientific subjects in Houston newspapers until his death in 1872.

  18. John Banister: an Elizabethan surgeon in Brazil.

    PubMed

    Mello, Amílcar D'Avila de

    2011-03-01

    In Brazil's sixteenth-century history, very few references are made to health professionals. On the expedition of Edward Fenton, dispatched by the English Crown in 1582 to set up a trading post in Asia, was the famous barber-surgeon and physician John Banister. The naval squadron, diverted from its original route to repeat the feats of Sir Francis Drake, stopped over in Africa, crossed the Atlantic and anchored off the Santa Catarina coast in Brazil. In these waters, the expedition degenerated into piracy and returned unsuccessful to Europe. John Banister is considered the person who liberated English anatomy from mediaeval slavery, shedding upon it the light of the Renaissance. It was the first time that anyone of this importance in the area of health had visited these latitudes. PMID:21552689

  19. John Dewey's Visits to Hawai'i

    ERIC Educational Resources Information Center

    McEwan, Hunter

    2015-01-01

    John Dewey visited Hawai'i on three separate occasions. Of all three trips, by far the most important, as far as Dewey's influence on education in Hawai'i is concerned, was in 1899 when he came with his wife, Alice Chipman Dewey, to help launch the University Extension program in Honolulu. The Deweys' second trip was a very brief one--twenty years…

  20. Astronaut John Young displays drawing of Snoopy

    NASA Technical Reports Server (NTRS)

    1969-01-01

    Astronaut John W. Young, Apollo 10 command module pilot, displays drawing of Snoopy in this color reproduction taken from the fourth telecast made by the color television camera aboard the Apollo 10 spacecraft. When this picture was made the Apollo 10 spacecraft was about half-way to the moon, or approximately 112,000 nautical miles from the earth. Snoopy will be the code name of the Lunar Module (LM) during Apollo 10 operations when the LM and CM are separated.

  1. The mystery of John Wilkes Booth's dentist.

    PubMed

    Hyson, J M; Kauffman, M W

    1999-11-01

    For many years there has been much speculation over the identity of the dentist of President Abraham Lincoln's assassin, John Wilkes Booth. Some have considered Dr. William Merrill (1833-1918), a rather prominent Washington, D.C. dentist, as the man who restored two of Booth's teeth with gold a few days before the assassination. Who was the mysterious Dr. Merrill and what evidence do we have that he ever treated Booth? PMID:10726569

  2. John A. Simpson (1916-2000)

    NASA Astrophysics Data System (ADS)

    John A. Simpson, recipient of the 2000 William Bowie Medal, died August 31 in Chicago at the age of 83. Dr. Simpson, who became an AGU member in 1957 and a Fellow in 1962, spent most of his professional career with the Enrico Fermi Institute for Nuclear Studies of the University of Chicago, and at that university's department of physics. He was a member of the Solar and Heliospheric Physics subsection of SPA.

  3. John Wesley Powell: soldier, explorer, scientist

    USGS Publications Warehouse

    U.S. Geological Survey

    1969-01-01

    One hundred years ago John Wesley Powell and nine adventure-seeking companions completed the first exploration of the dangerous and almost uncharted canyons of the Green and Colorado Rivers. By this trip, Powell, a 35-year old teacher of natural history, apparently unhampered by the lack of his right forearm (amputated after the Battle of Shiloh) opened up a large unknown part of continental United States and brought to a climax the era of western exploration.

  4. Astronaut John Young photographed collecting lunar samples

    NASA Technical Reports Server (NTRS)

    1972-01-01

    Astronaut John W. Young, commander of the Apollo 16 lunar landing mission, is photographed collecting lunar samples near North Ray crater during the third Apollo 16 extravehicular activity (EVA-3) at the Descartes landing site. This picture was taken by Astronaut Charles M. Duke Jr., lunar module pilot. Young is using the lunar surface rake and a set of tongs. The Lunar Roving Vehicle is parked in the field of large boulders in the background.

  5. John Hunter, Frederick Treves and intussusception.

    PubMed Central

    Stringer, M. D.; Willetts, I. E.

    2000-01-01

    Early this century, intussusception in childhood was usually fatal. John Hunter, one of the founding fathers of scientific surgery was amongst the first to accurately describe the clinico-pathological features of the condition and one of the great nineteenth century surgeons, Sir Frederick Treves, suggested a plan of management for intussusception which remains little changed up to the present day. Images Figure 1 Figure 2 Figure 3 PMID:10700761

  6. John Marshall: the making of true spectacles.

    PubMed Central

    Bryden, D. J.; Simms, D. L.

    1994-01-01

    In 1693 John Marshall of London devised a novel method of grinding batches of identical, good quality, lenses of a specified focal length. Its commendation by the Royal Society led to a trade war between Marshall and rivals in the Worshipful Company of Spectacle Makers. Despite initial opposition the method was rapidly adopted by London opticians and, though much modified, it forms the unrecognised basis of present day practice. Images p1714-a PMID:7819998

  7. Obituary: John Daniel Kraus, 1910-2004

    NASA Astrophysics Data System (ADS)

    Kraus, John D., Jr.; Marhefka, Ronald J.

    2005-12-01

    John Daniel Kraus, 94, of Delaware, Ohio, director of the Ohio State University "Big Ear" Radio Observatory, physicist, inventor, and environmentalist died 18 July 2004 at his home in Delaware, Ohio. He was born on 28 June 1910 in Ann Arbor, Michigan. He received a Bachelor of Science in 1930, a Master of Science in 1931, and a PhD in physics in 1933 (at 23 years of age), all from the University of Michigan, Ann Arbor. During the 1930s at Michigan, he was involved in physics projects, antenna consulting, and in atomic-particle-accelerator research using the University of Michigan's premier cyclotron. Throughout the late 1920s and the 1930s, John was an avid radio amateur with call sign W8JK. He was back on the air in the 1970s. In 2001 the amateur radio magazine CQ named him to the inaugural class of its Amateur Radio Hall of Fame. He developed many widely used innovative antennas. The "8JK closely spaced array" and the "corner reflector" were among his early designs. Edwin H. Armstrong wrote John in July 1941 indicating in part, "I have read with interest your article in the Proceedings of the Institute on the corner reflector...Please let me congratulate you on a very fine piece of work." Perhaps John's most famous invention, and a product of his intuitive reasoning process, is the helical antenna, widely used in space communications, on global positioning satellites, and for other applications. During World War II, John was in Washington, DC as a civilian scientist with the U.S. Navy responsible for "degaussing" the electromagnetic fields of steel ships to make them safe from magnetic mines. He also worked on radar countermeasures at Harvard University's Radio Research Laboratory. He received the U.S. Navy Meritorious Civilian Service Award for his war work. In 1946 he took a faculty position at Ohio State University, becoming professor in 1949, and retiring in 1980 as McDougal Professor Emeritus of Electrical Engineering and Astronomy. Even so, he never retired

  8. Obituary: John J. Hillman, 1938-2006

    NASA Astrophysics Data System (ADS)

    Chanover, Nancy

    2007-12-01

    John J. Hillman, a dedicated NASA civil servant, spectroscopist, astrophysicist, planetary scientist, and mentor, died on February 12, 2006 of ocular melanoma at his home in Columbia, Maryland. His professional and personal interests were wide-reaching and varied, and he devoted his career to the advancement of our understanding of the beauty and wonder in the world around us. His love of nature, art, and science made him a true Renaissance man. John was born in Fort Jay, New York, on November 22, 1938, and was raised in Washington, D.C. He received his B.S., M.S., and Ph.D. degrees in Physics from American University in 1967, 1970, and 1975, respectively. He began working at NASA's Goddard Space Flight Center, then in its infancy, in 1969, juggling a full-time position as a Research Physicist, the completion of his M.S. and Ph.D. degrees, and a young family. His background in molecular spectroscopy enabled him to apply his skills to numerous disciplines within NASA: infrared and radio astronomy; electronic, vibrational, and rotational structure of interstellar molecules; solar and stellar atmospheres; and planetary atmospheres. He published more than 70 journal papers in these disciplines. He was a frequent contributor to the Ohio State University International Symposium on Molecular Spectroscopy, and possessed a rare ability to bridge the gap between laboratory and remote sensing spectroscopy, bringing scientists from different disciplines together to understand our Universe. The last fifteen years of John's career were devoted to the development of acousto-optic tunable filter (AOTF) cameras. He championed this technology as a low-cost, low-power alternative to traditional imaging cameras for in situ or remotely sensed planetary exploration. It was within this context that I got to know John, and eventually worked closely with him on the demonstration and application of this technology for planetary science using ground-based telescopes in New Mexico, California

  9. Obituary: John Leroy Climenhaga, 1916-2008

    NASA Astrophysics Data System (ADS)

    Scarfe, Colin

    2009-01-01

    John Leroy Climenhaga was born on 7 November 1916 on a farm some 10 km from Delisle, a small town on the Canadian prairies, located about 50 km south-west of Saskatoon, Saskatchewan, and died at his home in Victoria, British Columbia, on 27 May 2008. His parents, Reuben and Elizabeth (nee Bert) Climenhaga, were farming folk, and he carried their honest and open attitude to the world throughout his life. John was the seventh born, and last to die, of their ten children. His father also served as an ordained minister of the Brethren in Christ. In early adulthood, John worked on his father's farm, but then attended the University of Saskatchewan, obtaining a B.A. with Honors in Mathematics and Physics and an M.A. in Physics, in 1945 and 1949 respectively. Between these events he worked as a Physics Instructor at Regina College from 1946 to 1948. In 1949 Climenhaga joined the faculty of Victoria College, as one of only two physicists in a small institution that was then part of the University of British Columbia. He remained in Victoria for the rest of his career, playing a major role in the College's growth into a full-fledged university, complete with thriving graduate programs in physics and astronomy as well as in many other fields. He served as Head of the Physics Department during the 1960s, a period which saw the College become the University of Victoria, with a full undergraduate program in Physics, and campaigned successfully for the establishment of a program in Astronomy, which began in 1965. From 1969 until 1972 he held the position of Dean of Arts and Science, and championed the university's participation in the Tri-University Meson Facility, whose high-current medium-energy beam was ideal for the production and study of mesons and their physics. That period was a turbulent one in the university's history, but John's integrity and his balanced and fair-minded approach to conflicts were of immeasurable importance in steering the young institution through it

  10. Spatial and temporal characterization of mosquito distribution and arbovirus transmission activity in St. Johns County, Florida. St. Augustine, FL.

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Global information technology (GIT) (including Global Positioning System [GPS], Geographic Information Systems [GIS], and image analysis) can be used to develop adult mosquito sampling methods and to characterize adult mosquito distributions and disease transmission patterns. At this meeting of v...

  11. John Ray in Italy: lost manuscripts rediscovered

    PubMed Central

    Hunter, Michael

    2014-01-01

    This paper discloses the content of two manuscripts of John Ray that have hitherto been unknown to Ray scholars. The manuscripts survive in the Hampshire Record Office, having descended through the Prideaux-Brune family. They record information about Ray's tour of Italy in the 1660s that does not appear in his Observations … made in a journey through … the Low-countries, Germany, Italy and France (1673), including a visit to the museum of Athanasius Kircher in Rome, and provide clues concerning the composition of Ray's 1673 book. PMID:24921104

  12. Obituary: John Daniel Kraus, 1910-2004

    NASA Astrophysics Data System (ADS)

    Kraus, John D., Jr.; Marhefka, Ronald J.

    2005-12-01

    John Daniel Kraus, 94, of Delaware, Ohio, director of the Ohio State University "Big Ear" Radio Observatory, physicist, inventor, and environmentalist died 18 July 2004 at his home in Delaware, Ohio. He was born on 28 June 1910 in Ann Arbor, Michigan. He received a Bachelor of Science in 1930, a Master of Science in 1931, and a PhD in physics in 1933 (at 23 years of age), all from the University of Michigan, Ann Arbor. During the 1930s at Michigan, he was involved in physics projects, antenna consulting, and in atomic-particle-accelerator research using the University of Michigan's premier cyclotron. Throughout the late 1920s and the 1930s, John was an avid radio amateur with call sign W8JK. He was back on the air in the 1970s. In 2001 the amateur radio magazine CQ named him to the inaugural class of its Amateur Radio Hall of Fame. He developed many widely used innovative antennas. The "8JK closely spaced array" and the "corner reflector" were among his early designs. Edwin H. Armstrong wrote John in July 1941 indicating in part, "I have read with interest your article in the Proceedings of the Institute on the corner reflector...Please let me congratulate you on a very fine piece of work." Perhaps John's most famous invention, and a product of his intuitive reasoning process, is the helical antenna, widely used in space communications, on global positioning satellites, and for other applications. During World War II, John was in Washington, DC as a civilian scientist with the U.S. Navy responsible for "degaussing" the electromagnetic fields of steel ships to make them safe from magnetic mines. He also worked on radar countermeasures at Harvard University's Radio Research Laboratory. He received the U.S. Navy Meritorious Civilian Service Award for his war work. In 1946 he took a faculty position at Ohio State University, becoming professor in 1949, and retiring in 1980 as McDougal Professor Emeritus of Electrical Engineering and Astronomy. Even so, he never retired

  13. Who was... John A Hunt OBE?

    PubMed

    Payne, D

    2001-12-01

    Major John A (Anthony) Hunt OBE (1906 - 1986) was a professional geologist who spent part of his working life in the oil fields of the world and a further highly significant period of 28 years (1936 - 58) as a Colonial Administrative Service Officer in the former British Protectorate of Somaliland. In 1943, he was personally selected by the Governor to carry out a wide-ranging General Survey of the Protectorate. The report of this General Survey attained such repute that newly appointed colonial administrators were recommended to rely on three basic documents: the Koran, the Bible and Hunt's, A General Survey of British Somaliland. PMID:11740081

  14. John Hughlings-Jackson: a sesquicentennial tribute.

    PubMed

    Swash, M

    1986-09-01

    One hundred and fifty years have elapsed since the birth of John Hughlings-Jackson, a pivotal figure in the development of clinical neuroscience. In this review the origin of Jackson's postulate of a hierarchical organisation of function in the nervous system is described in the context of his education and his contacts with contemporaries, both in his clinical practice at The London Hospital and at the National Hospital, Queen Square, and in relation to the evolutionary approach to the organisation and ideas on biology and society set out by the philosopher Herbert Spencer. PMID:3531410

  15. The healing philosopher: John Locke's medical ethics.

    PubMed

    Short, Bradford William

    2004-01-01

    This article examines a heretofore unexplored facet of John Locke's philosophy. Locke was a medical doctor and he also wrote about medical issues that are controversial today. Despite this, Locke's medical ethics has yet to be studied. An analysis of Locke's education and his teachers and colleagues in the medical profession, of the 17th century Hippocratic Oath, and of the reaction to the last recorded outbreak of the bubonic plague in London, shines some light on the subject of Locke's medical ethics. The study of Locke's medical ethics confirms that he was a deontologist who opposed all suicide and abortion through much of pregnancy. PMID:15709441

  16. Dedication: John W. Wright, 1929-1978

    NASA Astrophysics Data System (ADS)

    Wright, John W.

    1980-09-01

    The death of John W. Wright in an automobile accident on November 20, 1978, came as a great shock to all who knew him. His family and friends lost a stimulating, compassionate human being whose many-faceted personality they greatly admired. The scientific community working on remote sensing of the air-water interface lost one of its pioneers and leaders. To dedicate this issue of the Journal of Geophysical Research to Dr. Wright seems a fitting tribute to his many scientific achievements.

  17. La Fondation Saint-John Perse (The Saint-John Perse Foundation).

    ERIC Educational Resources Information Center

    Racine, Daniel L.

    1978-01-01

    Describes the collection of Perse's literary works, manuscripts, archives, and documents given by the author himself to the city of Aix-en-Provence. In addition to primary sources, the collection contains works on Saint-John Perse, many annotated by him. Grants are available from the foundation for doctoral research. (AMH)

  18. 3. Historic American Buildings Survey, John Jennings, Photographer February 16, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Historic American Buildings Survey, John Jennings, Photographer February 16, 1935 GROUND FLOOR, NORTH WALL, PULPIT. - Hanover Green Meetinghouse, Nanticoke vicinity, Hanover Green, Luzerne County, PA

  19. 1. Historic American Buildings Survey, John Jennings, Photographer December 27, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Historic American Buildings Survey, John Jennings, Photographer December 27, 1934 EAST (FRONT) AND NORTH ELEVATIONS. - Hanover Green Meetinghouse, Nanticoke vicinity, Hanover Green, Luzerne County, PA

  20. 5. Historic American Buildings Survey, John Jennings, Photographer February 16, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. Historic American Buildings Survey, John Jennings, Photographer February 16, 1935 BALCONY, SEATING ARRANGEMENT, SOUTH WALL. - Hanover Green Meetinghouse, Nanticoke vicinity, Hanover Green, Luzerne County, PA

  1. 4. Historic American Buildings Survey, John Jennings, Photographer February 16, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Historic American Buildings Survey, John Jennings, Photographer February 16, 1935 GROUND FLOOR, SEATING ARRANGEMENT & STAIRWAY. - Hanover Green Meetinghouse, Nanticoke vicinity, Hanover Green, Luzerne County, PA

  2. John Day Dam - Underwater video inspection

    SciTech Connect

    Vaughn, R.A.

    1995-12-31

    An underwater video inspection device has recently been designed and built for use at John Day Powerhouse on the Columbia River. It is used to inspect for damage on the submerged traveling screens, vertical barrier screens and orifices which are used to guide juvenile fish away from the turbines. The Corps of Engineers is legally required to inspect this equipment once per month. It is possible but time consuming to perform the inspections on submerged traveling screens by removing them. The removal of screens requires a six person crew and gantry crane. The time to remove and install a screen is about 3 hours. A typical plant such as John Day has 48 screens. On most power plants, it is not practical to remove the vertical barrier screens because it is so time consuming. These were formerly inspected by shutting down the generating units and using a camera on a tether to inspect. The new inspection device uses minimal crew and doesn`t require shutting down generating units. This system is intended to be a prototype and it is expected that some improvements to the system will be developed as the system is used.

  3. MPI Enhancements in John the Ripper

    NASA Astrophysics Data System (ADS)

    Sykes, Edward R.; Lin, Michael; Skoczen, Wesley

    2010-11-01

    John the Ripper (JtR) is an open source software package commonly used by system administrators to enforce password policy. JtR is designed to attack (i.e., crack) passwords encrypted in a wide variety of commonly used formats. While parallel implementations of JtR exist, there are several limitations to them. This research reports on two distinct algorithms that enhance this password cracking tool using the Message Passing Interface. The first algorithm is a novel approach that uses numerous processors to crack one password by using an innovative approach to workload distribution. In this algorithm the candidate password is distributed to all participating processors and the word list is divided based on probability so that each processor has the same likelihood of cracking the password while eliminating overlapping operations. The second algorithm developed in this research involves dividing the passwords within a password file equally amongst available processors while ensuring load-balanced and fault-tolerant behavior. This paper describes John the Ripper, the design of these two algorithms and preliminary results. Given the same amount of time, the original JtR can crack 29 passwords, whereas our algorithms 1 and 2 can crack an additional 35 and 45 passwords respectively.

  4. John Lubbock, science, and the liberal intellectual

    PubMed Central

    Clark, J. F. M.

    2014-01-01

    John Lubbock's longest-standing scientific research interest was entomology. Some of his earliest systematic investigations of insect and marine life began under the tutelage of Darwin. Darwin shaped the trajectory of, and the programme for, Lubbock's natural history work. However, to understand John Lubbock's identity as a scientist, he must be located within the context of the Victorian ‘intellectual’. This paper traces Lubbock's entomological work from its early development under Darwin to his later work on insect sensory physiology and comparative psychology. Far from being the death of his scientific career, Lubbock's entry into Parliament marked the pinnacle of his career as a scientific intellectual. He built on his early work on invertebrate anatomy, physiology and taxonomy, and on his archaeological and anthropological research to expound his vision of mental evolution. His research on ‘savages’, on ants, bees and wasps, and on his dog, ‘Van’, permitted him to expatiate upon the psychic unity of all sentient beings, which, in turn, underpinned his overarching educational programme.

  5. The Trieste Lecture of John Stewart Bell

    NASA Astrophysics Data System (ADS)

    Bassi, Angelo; Carlo Ghirardi, Gian

    2007-03-01

    Delivered at Trieste on the occasion of the 25th Anniversary of the International Centre for Theoretical Physics, 2 November 1989 The video of this lecture is available here. Please see the PDF for the transcript of the lecture. General remarks by Angelo Bassi and GianCarlo Ghirardi During the autumn of 1989 the International Centre for Theoretical Physics, Trieste, celebrated the 25th anniversary of its creation. Among the many prestigious speakers, who delivered extremely interesting lectures on that occasion, was the late John Stewart Bell. All lectures have been recorded on tape. We succeeded in getting a copy of John's lecture. In the lecture, many of the arguments that John had lucidly stressed in his writings appear once more, but there are also extremely interesting new remarks which, to our knowledge, have not been presented elsewhere. In particular he decided, as pointed out by the very choice of the title of his lecture, to call attention to the fact that the theory presents two types of difficulties, which Dirac classified as first and second class. The former are those connected with the so-called macro-objectification problem, the latter with the divergences characterizing relativistic quantum field theories. Bell describes the precise position of Dirac on these problems and he stresses appropriately how, contrary to Dirac's hopes, the steps which have led to a partial overcoming of the second class difficulties have not helped in any way whatsoever to overcome those of the first class. He then proceeds to analyse the origin and development of the Dynamical Reduction Program and draws attention to the problems that still affect it, in particular that of a consistent relativistic generalization. When the two meetings Are there quantum jumps? and On the present status of Quantum Mechanics were organized in Trieste and Losinj (Croatia), on 5 10 September 2005, it occurred to us that this lecture, which has never been published, might represent an

  6. Ryan ST Sportplane

    NASA Technical Reports Server (NTRS)

    1938-01-01

    Ryan ST (STA Special): The sporty Ryan ST was flown at Langley Memorial Aeronautical Laboratory in research conducted concerning flaps, slats, and internally-balanced ailerons. 'NACA 96' ended its flying career as a familiarization aircraft for new pilots on the NACA staff. In December 1944, it became NACA 125 and was transferred to the Loads Lab located in the West Area.

  7. Can Hooke's Law and the Airy Disk First Zero Radius Formulation Predict That Education and Work Environment Visual Task Excesses Lead to Vision Impairment?

    NASA Astrophysics Data System (ADS)

    McLeod, Douglas M.; McLeod, Roger D.

    2002-10-01

    DMM found that a distant, single church steeple, which appeared "twin-like" after extended studying episodes, could then be brought into correct visual register by a conscious effort. Similar anecdotal events are repeatable by attentive students or workers in the early stages of educationally or work environmentally induced repetitive vision impairment. RDM proposes that his model for vision and its repair utilizes sequentially applied vision improvement stages that are the equivalent of DMM's experience. Such visual events involve feedback signals generated during the crystalline lens's minor dioptric oscillations that are generated by the blinking reflex, empowered by the Airy radius proportional to wavelength times focal length divided by pupil aperture. This implies some conscious control of feedback mechanisms, which can self-regulate vision protecting processes. Continued visual effort under duress invokes Hooke's "stress proportional to strain." Exceeding extrinsic eye muscles' elastic limits overrides spontaneous feedback repair mechanisms.

  8. Time to Talk: 5 Things to Know about St. John's Wort and Depression

    MedlinePlus

    ... What You Should Know About the Science Behind Depression and Complementary Health Approaches Share: Depression is a ... links Twitter Read our disclaimer about external links Facebook Read our disclaimer about external links YouTube Read ...

  9. St. John's Wort in Relieving Fatigue in Patients Undergoing Chemotherapy or Hormone Therapy for Cancer

    ClinicalTrials.gov

    2013-01-17

    Chronic Myeloproliferative Disorders; Fatigue; Leukemia; Lymphoma; Multiple Myeloma and Plasma Cell Neoplasm; Myelodysplastic Syndromes; Precancerous Condition; Unspecified Adult Solid Tumor, Protocol Specific

  10. Impact of hypericum (St.-John's-wort) given prenatally on cognition of mice offspring.

    PubMed

    Rayburn, W F; Gonzalez, C L; Christensen, H D; Harkins, T L; Kupiec, T C

    2001-01-01

    This study investigated the cognitive impact of prenatal exposure to the herbal antidepressant hypericum in CD-1 mice. Hypericum (182 mg/kg/day) or a placebo was consumed in food bars for 2 weeks before mating and throughout gestation. The hypericin content in our hypericum formulation was in the middle range of standardized hypericum products. One offspring per gender from each litter (hypericum 13, placebo 12) was tested on each of the following tasks: juvenile runway with adult memory, adult Morris maze, adult passive avoidance, or adult straight water runway followed by a dry Cincinnati maze. Learning occurred in both genders in all tasks (P<.003) with no significant differences between treatments at the final trial. Female offspring exposed to hypericum, rather than to a placebo, required more time to learn the Morris maze task (P<.05). Postlearning sessions did not show any significant differences. In conclusion, prenatal exposure to a therapeutic dose of hypericum did not have a major impact on certain cognitive tasks in mice offspring. PMID:11792531

  11. 33 CFR 165.720 - Safety/Security Zone: St. Johns River, Jacksonville, FL.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...: (1) All waters within 200 yards of Blount Island, Jacksonville, Florida and all adjacent land within 100 yards of the island shoreline during staging of Department of Defense equipment and during the loading/unloading of military supply vessels. (2) All waters within 200 yards of “any” waterfront...

  12. The effect of Hypericum perforatum (St. John's Wort) on experimental colitis in rat.

    PubMed

    Dost, Turhan; Ozkayran, Hakan; Gokalp, Filiz; Yenisey, Cigdem; Birincioglu, Mustafa

    2009-06-01

    The aim of the present study was to investigate the effect of Hypericum perforatum (HP) on the inflammatory and immune response of colonic mucosa in rat with induced inflammatory bowel disease and that on various enzyme activities in blood and bowel tissue. Male Wistar albino rats were divided into three main groups: control, third day, and seventh day of colitis. Third-day and seventh-day groups were divided into four subgroups. Colitis was induced in all groups except the control group by 2,4,6-trinitrobenzene sulfonic acid (TNBS). The colitis group received saline; treatment groups received HP extract (50, 150, and 300 mg/kg/day, respectively). Glutathione (GSH), catalase (CAT), and malondialdehyde (MDA) activities in blood were measured. Catalase, myeloperoxidase (MPO), glutathione peroxidase (GSH-Px), glutathione reductase (GR), malondialdehyde, and nitric oxide (NO) activities were measured from tissue samples. Colonic damage was significantly reduced by HP extract. Macroscopic scoring of colonic damage significantly reduced in groups given HP extract compared with in the colitis group (P < 0.001). Blood catalase levels were reduced in the HP (150 mg/kg/day) compared with the colitis group (P < 0.01). Blood GSH levels significantly increased in groups treated with HP compared with control (P < 0.001) on the third and seventh day. Tissue GR levels reduced in the colitis and HP (50 mg/kg/day) groups compared with control (P < 0.05). Tissue MPO activity increased in the colitis and treatment groups compared with control (P < 0.007). GSH-Px levels increased in the colitis group compared with control at day 3 (P = 0.006). HP has a protective effect on TNBS-induced inflammatory bowel disease (IBD), probably due to an anti-inflammatory and antioxidant mechanism. PMID:18754092

  13. Corneal grafts at St John Eye Hospital, Jerusalem, January 2001–November 2002

    PubMed Central

    Claesson, M; Armitage, W J

    2004-01-01

    Aim: To compare a cohort of corneal graft patients in east Jerusalem with one in Sweden, concerning diagnosis, sex, patient age, preoperative visual acuity in both eyes, and type of operation. Methods: Standard forms developed for the Swedish Corneal Transplant Register were used for data collection at the time of operation. Results: In east Jerusalem, keratoconus accounted for 51% of the grafts compared with only 27% in Sweden and the male:female ratio was reversed. There were very few patients with endothelial disease. The Palestinian patients had overall worse visual acuity both in the eye to be operated and the fellow eye compared with patients in Sweden. Conclusion: Significant differences were found between the Palestinian and Swedish cohorts in the distribution of indications for transplantation and preoperative visual acuity. PMID:15205224

  14. New library buildings: the Health Sciences Library, Memorial University of Newfoundland, St. John's.

    PubMed Central

    Fredericksen, R B

    1979-01-01

    The new Health Sciences Library of Memorial University of Newfoundland is described and illustrated. A library facility that forms part of a larger health sciences center, this is a medium-sized academic health sciences library built on a single level. Along with a physical description of the library and its features, the concepts of single-level libraries, phased occupancy, and the project management approach to building a large health center library are discussed in detail. Images PMID:476319

  15. Remote sensing of wetlands, marshes, and shorelines in Michigan including St. John's Marsh

    NASA Technical Reports Server (NTRS)

    Lowe, D. S.

    1976-01-01

    Remote sensing data are used to show the strategic relationship of the endangered marsh to population centers of SE Michigan. The potential ecological consequences and the impact of past development and changing lake levels are discussed. Applications of remote sensing are presented showing its usefulness for preparing statewide infrared wetland and forest mapping.

  16. Photocopy of drawing. LAUNCH COMPLEX 39, CRAWLER TRANSPORTER. NASA, John ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of drawing. LAUNCH COMPLEX 39, CRAWLER TRANSPORTER. NASA, John F. Kennedy Space Center, Florida. Drawing 79K00081, John F. Kennedy Space Center, December 1969. SYS FUNCTIONAL DRAWING. Sheet 3 - Cape Canaveral Air Force Station, Launch Complex 39, Crawler Transporters, Launcher Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

  17. Photocopy of drawing. LAUNCH COMPLEX 39, CRAWLER TRANSPORTER. NASA, John ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of drawing. LAUNCH COMPLEX 39, CRAWLER TRANSPORTER. NASA, John F. Kennedy Space Center, Florida. Drawing 79K00088, John F. Kennedy Space Center, November 1969. SYS FUNCTIONAL DRAWING. Sheet 6 - Cape Canaveral Air Force Station, Launch Complex 39, Crawler Transporters, Launcher Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

  18. Photocopy of drawing. LAUNCH COMPLEX 39, CRAWLER TRANSPORTER. NASA, John ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of drawing. LAUNCH COMPLEX 39, CRAWLER TRANSPORTER. NASA, John F. Kennedy Space Center, Florida. Drawing 79K00088, John F. Kennedy Space Center, November 1969. SYS FUNCTIONAL DRAWING. Sheet 5 - Cape Canaveral Air Force Station, Launch Complex 39, Crawler Transporters, Launcher Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

  19. Activities commemorating John B. Herrington as first Native American astronaut

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- Joyce and James Herrington, parents of John Herrington, accept a gift during a pre-launch Native American ceremony. They are the parents of John Herrington, mission specialist on mission STS-113. Herrington is the first Native American to be going into space.

  20. Celebrating the Life and Legacy of Dr. John Hope Franklin

    ERIC Educational Resources Information Center

    Harris, Robert L., Jr.; Levering-Lewis, David; French, John D.; Wharton, Clifton R., Jr.

    2009-01-01

    Dr. John Hope Franklin chronicled the experiences of African-Americans like no one before him, forcing America to recognize Black history as American history. His contributions were innumerable and his impact was abiding. In celebration of his life and legacy, the authors profile the celebrated scholar and activist, Dr. John Hope Franklin.

  1. 33 CFR 117.881 - John Day River.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false John Day River. 117.881 Section 117.881 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Oregon § 117.881 John Day River. The draw of...

  2. Familiar-Strange: Teaching the Scripture as John Would Teach

    ERIC Educational Resources Information Center

    Ha, Tung-Chiew

    2014-01-01

    The Gospel of John teaches through telling the story of Jesus in light of the familiar Hebrew faith stories. It is an interpretive task that presents Jesus to his audience and teaches them adequate faith. John the Teacher skillfully uses narrative skills to create the familiar-strange effect in his storytelling. Each story is followed by a…

  3. A Lifetime of Service: Dr. John Arthur Henschke

    ERIC Educational Resources Information Center

    Cooper, Mary

    2008-01-01

    John Henschke is a lifelong learner who studied with Malcolm Knowles and who interviewed and knew such adult educators as Cyril Houle and his contemporaries. John has devoted his life to service both in the ministry and in education; he has traveled the globe with a view to encouraging lifelong learning and the concepts of andragogy for all. His…

  4. John Dewey's Experiential Theories and Leadership Preparation in Higher Education

    ERIC Educational Resources Information Center

    Berman, Larry A.

    2013-01-01

    The purpose of this study was to investigate the degree to which John Dewey's experiential theories were embedded in leadership preparation curricula in departments of leadership and college student personnel administration at universities in the Midwestern United States. John Dewey, who is considered to be America's greatest philosopher, defined…

  5. In memoriam - John M. Young (1942-2013)

    Technology Transfer Automated Retrieval System (TEKTRAN)

    It is with sadness that friends and colleagues of John Young learnt of his death at home in Auckland, New Zealand on 30th September 2013. John began his scientific career at the Plant Diseases Division (PDD) of the Department of Scientific and Industrial Research (DSIR), New Zealand after completing...

  6. 76 FR 39867 - Russell, John G.; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-07

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Russell, John G.; Notice of Filing Take notice that on June 29, 2011, John G. Russell submitted for filing, an application for authority to hold interlocking positions, pursuant...

  7. 40. Historic American Buildings Survey John O. Brostrup, Photographer August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    40. Historic American Buildings Survey John O. Brostrup, Photographer August 13, 1936 1:50 P. M. DETAIL OF SOUTH WALL-CENTRAL ROOM OF BASEMENT-UNIT B-AFTER CHALKING - General John Mason House, Analostan Island or Theodore Roosevelt Island, Washington, District of Columbia, DC

  8. 39. Historic American Buildings Survey John O. Brostrup, Photographer August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    39. Historic American Buildings Survey John O. Brostrup, Photographer August 13, 1936 1:30 P. M. DETAIL OF SOUTH WALL-CENTRAL ROOM OF BASEMENT-UNIT B-BEFORE CHALKING. - General John Mason House, Analostan Island or Theodore Roosevelt Island, Washington, District of Columbia, DC

  9. 18. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. John and James Dobson Carpet Mill, East and West parcels, site plan-lower left, and surrounding environs, 1925. Bromley, George Washington and Bromley, Walter Scott. Atlas of the City of Philadelphia (North Philadelphia), Philadelphia, Pennsylvania: George W. and Walter S. Bromley, 1925, p. 106. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  10. Activities commemorating John B. Herrington as first Native American astronaut

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- The Chickasaw Dance Troupe performs an Honor Dance for John Herrington's parents during the Native American Ceremony at the Rocket Garden in the KSC Visitor Complex. The ceremony was part of several days' activities commemorating John B. Herrington as the first tribally enrolled Native American astronaut to fly on a Shuttle mission. Herrington is a Mission Specialist on STS-113.

  11. 17. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. John and James Dobson Carpet Mill, East and West Parcels, site plan, revised through 1914. Hexamer, Ernest and Son. Insurance Maps of the City of Philadelphia, Vol. 21., Philadelphia, Pennsylvania: E. Hexamer and Son, 1893. Revisions, 1914, p. 446. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  12. 14. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. John and James Dobson Carpet Mill, East and West parcels, site plan, revised through 1895. Hexamer, Ernest and Son. Insurance Maps of the City of Philadelphia, Vol. 21., Philadelphia, Pennsylvania: E. Hexamer and Son, 1893. Revisions, 1895, p. 446. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  13. 77 FR 27766 - Jamar, John P.; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-11

    ... Energy Regulatory Commission Jamar, John P.; Notice of Filing Take notice that on May 3, 2012, John P...-8659. Comment Date: 5 p.m. Eastern Time on May 24, 2012. Dated: May 4, 2012. Kimberly D. Bose, Secretary. BILLING CODE 6717-01-P...

  14. 16. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. John and James Dobson Carpet Mill, East and West parcels, site plan-right, and western environs, 1908. Smith, Elvino Victor. Atlas of the 38th and Part of the 37th Ward of the City of Philadelphia, Philadelphia, Pennsylvania: Elvino V. Smith, 1908, Plate 24. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  15. 11. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. John and James Dobson Carpet Mill, East and West parcels, site plan-upper left, elevation-lower left, and survey-right, 1877. Hexamer, Ernest and Son. Hexamer General Surveys, 1867-1895, Philadelphia, Pennsylvania: E. Hexamer and Son, 1877, pp. 1095-1096. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  16. 21. Historic American Buildings Survey John O. Brostrup, Photographer August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    21. Historic American Buildings Survey John O. Brostrup, Photographer August 21, 1936 12:30 P. M. DETAIL OF SILL ON SOUTH SIDE OF BASEMENT OF UNIT B. - General John Mason House, Analostan Island or Theodore Roosevelt Island, Washington, District of Columbia, DC

  17. 71. Historic American Buildings Survey John O. Brostrup, Photographer August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    71. Historic American Buildings Survey John O. Brostrup, Photographer August 12, 1936 1:30 P. M. VIEW OF C.C.C. BOYS EXCAVATING IN UNIT A. - General John Mason House, Analostan Island or Theodore Roosevelt Island, Washington, District of Columbia, DC

  18. 67. Historic American Buildings Survey John Oliver Brostrup, Photographer August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    67. Historic American Buildings Survey John Oliver Brostrup, Photographer August 12,1936 1:35 P. M. VIEW OF C.C.C. BOYS SCREENING FOR ARTIFACTS. - General John Mason House, Analostan Island or Theodore Roosevelt Island, Washington, District of Columbia, DC

  19. 19. John and James Dobson Carpet Mills, West parcel, topographical ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    19. John and James Dobson Carpet Mills, West parcel, topographical plan, 1986. Barton and Martin, Engineers. 'Topographical Plan for Dobson Mills.' Prepared for Rouse Urban Housing, Inc., Philadelphia, Pennsylvania, 1986. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  20. Tribes of Men: John Joseph Mathews and Indian Internationalism

    ERIC Educational Resources Information Center

    Lutenski, Emily

    2012-01-01

    In this article, the author discusses John Joseph Mathews and Indian internationalism. As an old man, Osage intellectual, writer, and historian, John Joseph Mathews recalled his expatriation from the United States during the 1920s. After growing up in Pawhuska, Oklahoma, seat of the Osage Nation, where he had been born in 1894 to a white mother…

  1. 10. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. John and James Dobson Carpet Mill, East and West parcels, site plan-lower right, and surrounding environs, 1875. Hopkins, Griffith Morgan. City Atlas of Philadelphia by Wards, 7 vols., Philadelphia, Pennsylvania: G. M. Hopkins and Co., 1875, pp. 46-47. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  2. 9. John and James Dobson Carpet Mill, portion of West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. John and James Dobson Carpet Mill, portion of West parcel, site plan-left, elevation-upper right, and survey-lower right, 1873. Hexamer, Ernest and Son. Hexamer General Surveys 1867-1895, Philadelphia, Pennsylvania: E. Hexamer and Son, 1873, pp. 670-671. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  3. 13. John and James Dobson Carpet Mill, East and West ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    13. John and James Dobson Carpet Mill, East and West parcels, site plan-upper left, elevation-upper right, and survey-below, 1885. Hexamer, Ernest and Son. Hexamer General Surveys, 1867-1895, Philadelphia, Pennsylvania: E. Hexamer and Son, 1885, pp. 1890-1891. - John & James Dobson Carpet Mill (West Parcel), 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

  4. Logos Announced the Light of Salvation: Interpreting How John Presented His Message in John 1:1-18, According to Functional Grammar

    ERIC Educational Resources Information Center

    Pollinger, Seth

    2014-01-01

    This study of John 1:1-18 describes how John (the speaker) presented his message to his audience within their activity of verbal communication. By focusing on verbal meaning, this interpretation analyzes how John presented and expressed his meanings through language by interpreting this text based on the seamless interrelation between John's…

  5. Dr. John J. Stephens, Jr., metallurgist extraordinaire.

    SciTech Connect

    Hosking, Floyd Michael

    2010-10-01

    The organizers of the Dr. John J. Stephens, Jr. Memorial Symposium: Deformation and Interfacial Phenomena in Advanced High-Temperature Materials are honoring the memory of Dr. Stephens and his many technical contributions that were accomplished over a relatively brief twenty year career. His research spanned the areas of creep and deformation of metals, dispersion-strengthened alloys and their properties, metal matrix composite materials, processing and properties of refractory metals, joining of ceramic-ceramic and metal-ceramic systems, active braze alloy development, and mechanical modeling of soldered and brazed assemblies. The purpose of this presentation is to highlight his research and engineering accomplishments, particularly during his professional career at Sandia National Laboratories in Albuquerque, NM.

  6. John Dewey and early Chicago functionalism.

    PubMed

    Backe, A

    2001-11-01

    John Dewey and James Angell are regarded respectively as the founder and systematizer of the Chicago school of functional psychology. The early Chicago school traditionally has been portrayed as a unified theoretical approach based primarily on William James's naturalist theory of mental processes. It is argued in this article that although the psychology systematized by Angell bore a close affinity to James's naturalism, Dewey's own psychology was based primarily on the neo-Hegelian philosophy of Thomas Hill Green. Through a review of a number of Dewey's major writings, Green's neo-Hegelian philosophy is shown to have influenced Dewey's views on psychological concepts such as reaction, emotion, and perception during the formative period of the Chicago school. The interpretation of Dewey's psychology developed in this article leads to the conclusion that early Chicago functionalism should not be regarded as a unified theoretical approach. PMID:11763887

  7. STS-79 John Blaha address news media

    NASA Technical Reports Server (NTRS)

    1996-01-01

    STS-79 Mission Specialist John E. Blaha addresses news media gathered for the flight crew's late night arrival at the KSC Shuttle Landing Facility. A veteran space traveler who served as either commander or pilot on his four previous Shuttle flights, Blaha is taking a mission specialist's slot on STS-79 because he will be transferring to the Russian Space Station Mir for an extended stay. American astronaut Shannon Lucid will take his place aboard the Space Shuttle Atlantis for the return trip home. Final preparations are under way for launch of Atlantis on Mission STS-79, with liftoff scheduled to occur during an approximately seven-minute window opening at 4:54 a.m. EDT, Sept.16.

  8. John F. Dewey—Tectonics Editor

    NASA Astrophysics Data System (ADS)

    Richman, Barbara T.

    ‘I want the journal to acquire a reputation for very rapid, fair, and accurate reviewing,’ asserted John F. Dewey, editor-in-chief of AGU's newest journal, Tectonics. Dewey said that he will rule the bimonthly, which will begin publication in February, ‘with a bit of a rod of iron’ to ensure that Tectonics is ‘where only original and important papers are published.’‘I'm going to be very strict with reviewers,’ Dewey explained in his quick British clip. ‘If the review does not come back to me within 10 days to 2 weeks, I'll review the paper myself. I'm also going to have a system whereby, if a paper needs major surgery after being refereed, it will be rejected. Papers will have to be in virtually publishable condition before they are first submitted,’ he said.

  9. John Shaw Billings as a Bibliographer

    PubMed Central

    Marson, Joyce

    1969-01-01

    The influences that a man's childhood have on his life are, it is well known, great. Life is essentially a part of the things that happen to the individual and it is the manner in which one relates oneself to these things that determines what one is. With these facts in mind this study of John Shaw Billings as a bibliographer has been approached. His early life has been reviewed as an influence on his later achievements. Stress has been placed on those events which led to his bibliographic activities. Dr. Billings was prolific in many fields. Others have given detailed analyses of his writings (1, 2). The present study will consider only his bibliographic works. The description of these follows the brief outline of his childhood and youth. PMID:4898628

  10. Johns Hopkins legionary: Leighton's lineage and legacy.

    PubMed

    Lumsden, David Paul

    2006-03-01

    What is the relationship between sociocultural environment and psychiatric disorder? In particular, what is 'social disintegration', its characteristics, dangers and possible remediation? Alexander Hamilton Leighton and Jane Murphy's interdisciplinary contributions derive from those consuming concerns. This article contextualizes the famous Stirling County Study by suggesting that a hitherto unrecognized shaping role was played by William Henry Welch of Johns Hopkins and The Rockefeller Foundation, especially so through the example of Hopkins's epidemiological 'demonstration areas'. The article then details the Stirling County Study itself, including its relations with Dalhousie University and Canadian psychiatry. The concluding section identifies and assesses a wider set of achievements and contributions forming Leighton and Murphy's legacy to our several but interdependent fields of cross-cultural endeavour. PMID:16671390

  11. John B. Little Center Annual Symposium

    SciTech Connect

    Demple, Bruce F.

    2007-11-02

    The Annual Symposium of the John B. Little Center for Radiation Sciences and Environmental Health at the Harvard School of Public Health seeks to educate radiobiologists and biomedical scientists in related areas on the leading research related to the effects of ionizing radiation and related environmental agents in biological systems. This effort seeks to further the training of individuals in this field, and to foment productive interactions and collaborations among scientists at Harvard and with other institutions. The Symposium attracts world-class scientists as speakers, and a broad cross-section of attendees from academic, government, and industrial research centers, as well as editorial staff from leading scientific publications. In order to maintain this quality, funding to support the travel and local expenses of invited speakers is sought, along with funds to allow use of appropriate conference facilities.

  12. John N. Crouse--crusader and mitigator.

    PubMed

    Schulein, Thomas M

    2005-11-01

    During the last part of the nineteenth century, John N. Crouse fought hard to defeat the process patents of the International Tooth Crown Company. Prior to that time he engaged in a lucrative dental practice, was a President of the American Dental Association and was a highly respected dentist in Chicago. In the midst of his fight against the International Tooth Crown Company, Crouse organized a dental supply business and a dental journal. After the defeat of the Tooth Crown Company's patents, in an interesting turn of events, Crouse appeared to form an alliance with a party who formed another threat to the dental profession by foisting his patents on it. This article traces the life of a noteworthy man who could rightly be placed among the most important figures in American dentistry. PMID:16396213

  13. John Elliott Nafe (1914-1996)

    NASA Astrophysics Data System (ADS)

    Nelson, Robert J.

    John Elliott Nafe, known for his many pioneering contributions to seismological research, died on April 6 at his home in Vancouver, British Columbia. He had been an AGU Fellow since 1962. A physicist by training, Nafe proposed several important seismological concepts. In 1958, he was the first to demonstrate that sound waves could travel around the globe through the ocean. With colleague Charles L. Drake, he developed the Nafe-Drake Curve, which relates the velocity of sound through rock to the rock's density. He was one of several pioneering researchers at Lamont-Doherty Earth Observatory, who in the 1940s and 1950s began profiling the Earth's crust at different points around the globe—an effort that eventually resulted in the tectonic plate theory of continental movement.

  14. John A. Simpson (1916-2000)

    NASA Astrophysics Data System (ADS)

    Jokipii, J. R.; Gloeckler, G.

    John Alexander Simpson, a long-time member and Fellow of AGU, member of the National Academy of Sciences, and last year's recipient of the Bowie Medal, died on August 31, 2000, from complications following open heart surgery. He was 83 years old and a professor emeritus at the University of Chicago, where he spent most of an extraordinarily varied and productive career.He received his bachelor's degree from Reed College in 1940, and a master's and a doctorate from New York University in 1942 and 1943. After working on the Manhattan Project until 1946, he joined the University of Chicago faculty where he rose through the ranks and was appointed to a succession of prestigious named professorships.

  15. Luhmann Receives 2007 John Adam Fleming Medal

    NASA Astrophysics Data System (ADS)

    Russell, Christopher T.; Luhmann, Janet G.

    2008-02-01

    This year's John Adam Fleming medalist quickly established a reputation as an innovative and productive scientist with a broad range of interests. She made early and seminal contributions to aeronomy, cosmic rays, and magnetospheric and planetary physics. She contributed importantly to the understanding of the interaction of the solar wind with the atmosphere and magnetic fields of Mercury, Venus, Earth, and Mars. She has examined the behavior of planetary rings, the interaction of interstellar neutrals with heliospheric plasmas, as well as the interaction of planetary neutrals with the heliosphere. She has led in the study of the interaction of the moon Titan with the Saturn magnetosphere, and most recently she developed a vigorous solar physics effort, leading the implementation of the IMPACT particle and field package on the twin STEREO mission, now entering its second year of successful operation.

  16. URobotics—Urology Robotics at Johns Hopkins

    PubMed Central

    Stoianovici, D

    2011-01-01

    URobotics (Urology Robotics) is a program of the Urology Department at the Johns Hopkins Medical Institutions dedicated to the development of new technology for urologic surgery (http://urology.jhu.edu/urobotics). The program is unique in that it is the only academic engineering program exclusively applied to urology. The program combines efforts and expertise from the medical and engineering fields through a close partnership of clinical and technical personnel. Since its creation in 1996, the URobotics lab has created several devices, instruments, and robotic systems, several of which have been successfully used in the operating room. This article reviews the technology developed in our laboratory and its surgical applications, and highlights our future directions. PMID:11954067

  17. John Adams and CERN: Personal Recollections

    NASA Astrophysics Data System (ADS)

    Brianti, G.; Plane, D. E.

    2014-02-01

    By any standards, John Adams had a most remarkable career. He was involved in three important, emerging technologies, radar, particle accelerators and controlled fusion, and had an outstanding impact on the last two. Without a university education, he attained hierarchical positions of the highest level in prestigious national and international organizations. This article covers the CERN part of his career, by offering some personal insights into the different facets of his contributions to major accelerator projects, from the first strong-focusing synchrotron, the PS, to the SPS and its conversion to a proton--antiproton collider. In particular, it outlines his abilities as a leader of an international collaboration, which has served as an example for international initiatives in other disciplines.

  18. John Herschel on the Discovery of Neptune

    NASA Astrophysics Data System (ADS)

    Kollerstrom, Nicholas

    2006-12-01

    The letters of John Herschel that concern the discovery of the planet Neptune have not been greatly discussed by historians of science. I have transcribed these in the course of archiving the British Neptune-discovery documents. Herschel tends to be depicted as a background figure in narrations of the story of Neptune's discovery, whereas the present account focuses upon his evolving view of the topic: the rival merits of the two main protagonists, and the startling manner in which an obscure branch of mathematics (perturbation theory) was able to pinpoint the position of a new sphere in the sky. As the son of the man who found Uranus, his views have a special relevance. Also, I suggest that his eloquent prose style may still be enjoyed today.

  19. John Quincy Adams's rhetorical crusade for astronomy.

    PubMed

    Portolano, M

    2000-09-01

    Astronomy thrived in Europe during the early nineteenth century, but in the United States a utilitarian mind-set opposed it. John Quincy Adams's oratory in support of American astronomical discovery reached its peak during congressional debate over the Smithsonian Institution (1838-1846). During this debate Adams countered proposals to found a university with plans for an observatory. His addresses to congressional and public audiences about observatories and astronomy were intended to foster interest in the science and encourage the growing astronomical community in America. Although the U.S. Naval Observatory in Washington, D.C., was established before the Smithsonian debate ended, many considered Adams its political father. Adams composed his speeches on astronomy in a systematic manner, following neoclassical principles of rhetoric that he had taught at Harvard University. His speeches both in and outside of Congress show evidence of the rhetorical principles he conscientiously used in the service of astronomy. PMID:11143785

  20. John Bryant Curtis: neurosurgeon, leader and mentor.

    PubMed

    Lai, Leon; Kaye, Andrew H; Buckley, Penelope

    2009-10-01

    In every generation of neurosurgeons, there are those whose judgment and professional accomplishments gain distinction among their peers. Such exceptional leaders often exhibit unique talent and inevitably, they exert a lasting influence on their field of endeavour. John Bryant Curtis was one of these. Rising from humble roots, Curtis made his impact in neurosurgery starting at the age of 36. A legendary and a master neurosurgeon for his period, he became the second director of Neurosurgery at The Royal Melbourne Hospital, succeeding R. S. Hooper in 1967. Like Hooper, Curtis had undertaken a three years Fellowship in Oxford at the Radcliffe Infirmary to train under Sir Hugh Cairns in 1947. On his return to Australia in 1950, he was among the pioneers in introducing percutaneous angiography into the country, which earned him the honourable Hunterian Professorship at the Royal College of Surgeons of England in 1958. This was in recognition for his contribution to the investigation of intracranial aneurysms. Among the many neurosurgeons whom John Bryant Curtis trained at the Royal Melbourne Hospital and at the Prince Henry Hospital, he was considered, by a few, a controversial figure. Others found the experience very positive. He was a distinguished neurosurgeon with expert clinical judgment, but simultaneously a stern and formidable character who demanded only the best from his staff and trainees. He was contrastingly thoughtful and gentle to his patients. Behind every great leader, there is a personal side, often more gentle and vulnerable than the public persona. Curtis was a generous, loving, funny, although at times eccentric human being. Although he died in 1989, ironically from metastatic brain tumours, his dynamic personality and work ethic imprinted a lasting impression on those who had met him. PMID:19604697