Sample records for ytterbium 175

  1. New data on activation cross section for deuteron induced reactions on ytterbium up to 50 MeV

    E-print Network

    F. Tárkányi; F. Ditrói; S. Takács; A. Hermanne; A. V. Ignatyuk

    2014-12-02

    Activation cross sections of deuteron induced reactions on ytterbium for production of $^{177g,173,172,171,170,169,167}$Lu, $^{177,175,169}$Yb and $^{173,168,167,165}$Tm were extended up to 50 MeV deuteron energy. The new data are in acceptable agreement with the earlier experimental data in the overlapping energy region. The experimental data are compared with the predictions of the ALICE-D, EMPIRE-D and TALYS 1.4 (TENDL-2013 on-line library results) codes.

  2. Integrated ytterbium-Raman fiber amplifier.

    PubMed

    Zhang, Lei; Jiang, Huawei; Cui, Shuzhen; Feng, Yan

    2014-04-01

    An integrated ytterbium-Raman fiber amplifier architecture is proposed for power scaling of a Raman fiber laser. It is an ytterbium (Yb) fiber amplifier seeded with a double or multiple wavelength laser and followed by a passive Raman fiber. The bluest wavelength light gets amplified in the Yb fiber and the power is transferred to redder wavelengths in the following Raman fiber. A proof of principle experiment demonstrates a 300 W all-fiber linearly polarized single mode amplifier at 1120 nm with an optical efficiency of 70%, limited only by available pump power. The amplifier consists of 4 m of Yb-doped fiber and 20 m of germanium-doped fiber, and seeded with a laser emitting at 1070 and 1120 nm. The power evolution of the 1070 and 1120 nm light inside the amplifier is investigated, both numerically and experimentally. The possibility of power scaling to over kilowatt levels is discussed. PMID:24686642

  3. Kilowatt Ytterbium-Raman fiber laser.

    PubMed

    Zhang, Lei; Liu, Chi; Jiang, Huawei; Qi, Yunfeng; He, Bing; Zhou, Jun; Gu, Xijia; Feng, Yan

    2014-07-28

    A kilowatt-level Raman fiber laser is demonstrated with an integrated Ytterbium-Raman fiber amplifier architecture. A high power Ytterbium-doped fiber master oscillator power amplifier at 1080 nm is seeded with a 1120 nm fiber laser at the same time. By this way, a kilowatt-level Raman pump laser at 1080 nm and signal laser at 1120 nm is combined in the fiber core. The subsequent power conversion from 1080 nm to 1120 nm is accomplished in a 70 m long passive fiber. A 1.28 kW all-fiber Raman amplifier at 1120 nm with an optical efficiency of 70% is demonstrated, limited only by the available pump power. To the best of our knowledge, this is the first report of Raman fiber laser with over one kilowatt output. PMID:25089467

  4. Feasibility study for production of 175Yb: a promising therapeutic radionuclide.

    PubMed

    Chakraborty, Sudipta; Unni, P R; Venkatesh, Meera; Pillai, M R A

    2002-09-01

    Owing to its favourable decay characteristics 175Yb (T1/2 = 4.2 d, E beta(max) = 480 keV) can be regarded as a potential radionuclide for therapeutic applications. Production of 175Yb using (174Yb(n, gamma)175Yb) reaction by thermal neutron bombardment on natural ytterbium target is described. The activity of 175Yb produced as well as its radionuclidic purity under different irradiation conditions were determined by gamma-ray spectrometry using an HPGe 4 K MCA system and compared with theoretically calculated values. The radiochemical purity after chemical processing was determined by paper chromatography as well as paper electrophoresis techniques. It is found that 31 Ci/g (1145 GBq/g) of 175Yb can be produced with > 95% radionuclidic purity (with approximately 3% of 169Yb and approximately 2% of 177Lu) by irradiating natural Yb2O3 target at a thermal neutron flux of 3 x 10(13) n/cm2/s for a period of 5 d. PMID:12201133

  5. Half life of 175Hf.

    PubMed

    Fang, Kaihong; Wang, Dawei; Yang, Shaobo; Zhao, Jiangtao; Peng, Haibo; Wang, Qiang; Wang, Tieshan

    2012-10-01

    This work measured the half life of radioisotope (175)Hf, which was produced by neutron activation method at the ZF-300-II Intense Neutron Generator in Lanzhou University. The half life of (175)Hf, measured by ?-ray spectrometry using a well calibrated GEM-60P coaxial High Purity Germanium (HPGe) detector, has been found to be 70.65±0.19 days. The present result agrees with the literature data well, while the accuracy was improved. PMID:22871434

  6. Experiments with Single Trapped Ytterbium Ions at JPL

    NASA Technical Reports Server (NTRS)

    Yu, Nan; Maleki, Lute

    2000-01-01

    This paper presents viewgraphs of experiments performed with single trapped Ytterbium ions. The topics include: 1) Ytterbium ion level scheme; 2) Paul-Straubel rf trap and single ion image; 3) D5/2 state lifetime measurement; 4) D3/2 state lifetime measurement; 5) Trapped individual ions in an optical cavity; 6) Initial exploratory system: experimental goals; and 7) Future systems: trap-cavity integration II.

  7. 1028 nm single mode Ytterbium-doped fiber laser

    Microsoft Academic Search

    M. C. Paul; S. W. Harun; M. R. A. Moghaddam; S. Das; R. Sen; A. Dhar; M. Pal; S. K. Bhadra; H. Ahmad

    2009-01-01

    An efficient Ytterbium-doped fiber laser (YDFL) operating at 1028 nm is demonstrated using a fiber Bragg grating (FBG). The\\u000a Ytterbium-doped fiber (YDF) is drawn from Yb2O3-doped preform, fabricated through deposition of porous layer of composition SiO2-GeO2 by the MCVD process in conjunction with a solution doping technique. The fabricated YDF has a 0.1 mol % of Yb2O3 in the core,

  8. Ytterbium (III) Luminescence in m-Methylbenzoic Acid-Containing Compounds.

    PubMed

    Kalinovskaya, I V; Zadorozhnaya, A N

    2015-05-01

    Complex compounds of ytterbium(III) with m-methylbenzoic acid and nitrogen-containing ligands luminescent in near infrared range have been synthesized. Spectral luminescence characteristics of heteroligand compounds of ytterbium(III) have been investigated. It has been established that ytterbium (III) m-methylbenzoate with 1,10-phenanthroline is characterized by the highest luminescence intensity. PMID:25744526

  9. 25 CFR 175.30 - Billing.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 175.30 Section 175.30 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Billing...customer's electric load where no billing history exists. (b) Unmetered...

  10. 2 CFR 175.15 - Award term.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 2010-01-01 2010-01-01 false Award term. 175.15 Section 175.15 Grants...GUIDANCE FOR GRANTS AND AGREEMENTS Reserved AWARD TERM FOR TRAFFICKING IN PERSONS § 175.15 Award term. (a) To implement the...

  11. 33 CFR 117.175 - Mokelumne River.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Mokelumne River. 117.175 Section 117.175 Navigation... California § 117.175 Mokelumne River. (a) The draw of the California...Transportation highway bridge, the Mokelumne River Bridge, mile 3.0, at East...

  12. 33 CFR 117.175 - Mokelumne River.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Mokelumne River. 117.175 Section 117.175 Navigation... California § 117.175 Mokelumne River. (a) The draw of the California...Transportation highway bridge, the Mokelumne River Bridge, mile 3.0, at East...

  13. Radiation effects on ytterbium-doped optical fibers

    NASA Astrophysics Data System (ADS)

    Singleton, Briana J.

    Assuming on-board satellite high-bandwidth communications will utilize passive optical fibers as a communication channel, this work focused on the impact of gamma and mixed gamma/neutron radiation on transmission through single-mode and multi-mode ytterbium-doped single-mode fibers operated as amplifiers for a 1060-nm light source. Standard optical patch cables were evaluated along with active ytterbium -doped double-clad fibers in the same radiation environment. Exposure times and signal transmission wavelength variations were used to investigate the degradation of the fibers exposed to total doses above 100 krad(Si). Further, the effect on the amplified signal gain was studied for the ytterbium -doped fibers. The increased attenuation in the fibers across a broad wavelength range in response to multiple levels of gamma radiation exposure, along with the effect that increased attenuation has on the actively pumped ytterbium -doped fiber amplifier performance was evaluated. Ytterbium-doped optical fibers demonstrate sensitivity to gamma and mixed neutron/gamma radiation exposures that is independent of the operational configuration of the fiber during irradiation. No identifiable dose rate damage production mechanism was encountered. However, fiber damage recovery following irradiation was found to be dependent on the radiation dose rate.

  14. All-fibre ytterbium laser tunable within 45 nm

    SciTech Connect

    Abdullina, S R; Babin, S A; Vlasov, A A; Kablukov, S I; Shelemba, I S [Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk (Russian Federation); Kurkov, A S [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation)

    2007-12-31

    A tunable ytterbium-doped fibre laser is fabricated. The laser is tuned by using a tunable fibre Bragg grating (FBG) as a selecting intracavity element. The laser is tunable within 45 nm (from 1063 to 1108 nm) and emits {approx}6 W in the line of width {approx}0.15 nm, the output power and linewidth being virtually invariable within the tuning range. The method is proposed for synchronous tuning the highly reflecting and output FBGs, and a tunable ytterbium all-fibre laser is built. (lasers)

  15. Discovery of dysprosium, holmium, erbium, thulium and ytterbium isotopes

    E-print Network

    C. Fry; M. Thoennessen

    2012-05-26

    Currently, 31 dysprosium, 32 holmium, 32 erbium, 33 thulium and 31 ytterbium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

  16. Discovery of dysprosium, holmium, erbium, thulium and ytterbium isotopes

    E-print Network

    Fry, C

    2012-01-01

    Currently, 31 dysprosium, 32 holmium, 32 erbium, 33 thulium and 31 ytterbium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

  17. Discovery of dysprosium, holmium, erbium, thulium, and ytterbium isotopes

    SciTech Connect

    Fry, C.; Thoennessen, M., E-mail: thoennessen@nscl.msu.edu

    2013-09-15

    Currently, thirty-one dysprosium, thirty-two holmium, thirty-two erbium, thirty-three thulium, and thirty-one ytterbium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

  18. Heavy Fermion Scaling Uranium vs. Cerium and Ytterbium Compounds

    E-print Network

    Lawrence, Jon

    Heavy Fermion Scaling Uranium vs. Cerium and Ytterbium Compounds J. M. Lawrence, UC Irvine/LANL C paramagnetic heavy Fermions (HF) Are spin fluctuations (SF) of itinerant 5f electrons different than SF at energy kBTsf) and to T-dependent scaling of Kondo/Anderson impurity model (K/AIM): Rare earth (RE) HF

  19. Divalent ytterbium complexes with crown and heterocrown ethers.

    PubMed

    Bartlett, Philip N; Champion, Martin J D; Light, Mark E; Levason, William; Reid, Gillian; Richardson, Peter W

    2015-02-21

    Several unusual complexes of ytterbium(ii) stabilised by coordination to mixed O4X2-donor macrocyclic ligands (X = O, NH, S or Se) are described. Distorted 8-coordination is evident from the crystal structure of the neutral [YbI2([18]aneO4Se2)], forming the first reported example of Yb(ii)-selenoether coordination. PMID:25492516

  20. Gain measurements at 5 nm in nickel-like ytterbium

    Microsoft Academic Search

    B. J. MacGowan; J. L. Bourgade; P. Combis; C. J. Keane; M. Louis-Jacquet; D. L. Matthews; D. Naccache; G. Stone; G. Thiell; D. A. Whelan

    1988-01-01

    Soft x-ray gain has been demonstrated at 5.03 nm within a laser produced plasma of Ni-like ytterbium. Experiments will also be described with higher Z Ni-like ions which can produce even shorter wavelength x-ray laser transition. 3 refs.

  1. OCEAN DRILLING PROGRAM LEG 175 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 175 SCIENTIFIC PROSPECTUS BENGUELA CURRENT Dr. Wolfgang Berger Co Universität Bremen Postfach 33 04 40 D-28334 Bremen Germany Dr. Carl Richter Staff Scientist, Leg 175 Ocean of any portion requires the written consent of the Director, Ocean Drilling Program, Texas A&M University

  2. New ytterbium-phosphate glass for diode-pumped lasers

    SciTech Connect

    Galagan, B I; Glushchenko, I N; Denker, B I; Sverchkov, S E [A M Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation); Kisel', V E; Kuril'chik, S V; Kuleshov, N V [International Laser Center, Belarus State Technical University, Minsk (Belarus)

    2009-10-31

    A new ytterbium laser glass based on an alumoborophosphate composition is developed. It is shown that the chemical and thermal stabilities of this glass are record-high for phosphate glasses and that its spectral and luminescent characteristics compare well with popular laser glasses. A mould of laser-quality glass doped with ytterbium with a concentration of 5x10{sup 20} cm{sup -3} is synthesised. Active laser elements 5x5x2 mm in size are prepared from this glass for longitudinal diode pumping. These elements were used to fabricate a laser, whose output power in the cw regime reached 783 mW and maximum slope efficiency was 28.9%. Pulses with a duration of {approx}150 fs and a peak power of about 5 kW are obtained in the passive mode-locking regime. (active media)

  3. Kinetic Monte Carlo Simulation of Oxygen Diffusion in Ytterbium Disilicate

    NASA Astrophysics Data System (ADS)

    Good, Brian

    2015-03-01

    Ytterbium disilicate is of interest as a potential environmental barrier coating for aerospace applications, notably for use in next generation jet turbine engines. In such applications, the diffusion of oxygen and water vapor through these coatings is undesirable if high temperature corrosion is to be avoided. In an effort to understand the diffusion process in these materials, we have performed kinetic Monte Carlo simulations of vacancy-mediated oxygen diffusion in Ytterbium Disilicate. Oxygen vacancy site energies and diffusion barrier energies are computed using Density Functional Theory. We find that many potential diffusion paths involve large barrier energies, but some paths have barrier energies smaller than one electron volt. However, computed vacancy formation energies suggest that the intrinsic vacancy concentration is small in the pure material, with the result that the material is unlikely to exhibit significant oxygen permeability.

  4. Dynamics of high-power erbium-ytterbium fiber amplifiers

    Microsoft Academic Search

    Guillaume Canat; Jean-Claude Mollier; Jean-Pierre Bouzinac; Glenn M. Williams; Brian Cole; Lew Goldberg; Yves Jaouën; Gabor Kulcsar

    2005-01-01

    Dynamic regimes of high-peak-power erbium-ytterbium (Er3+-Yb3+) codoped fiber amplifiers are analyzed for nanosecond-to-microsecond pulses. High-energy pulse generation requires a large-core fiber amplifier to increase energy storage and the threshold of nonlinear effects. A numerical model of large-core Er3+-Yb3+ fiber amplifiers is described. Dynamics of peak powers, amplified spontaneous emission, and population inversion are presented. Influence of radial dependence and reflections

  5. Bose-Einstein condensation of an ytterbium isotope

    SciTech Connect

    Fukuhara, Takeshi; Sugawa, Seiji [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan); Takahashi, Yoshiro [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan); CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012 (Japan)

    2007-11-15

    We report the observation of a Bose-Einstein condensate in a bosonic isotope of ytterbium ({sup 170}Yb). More than 10{sup 6} atoms are trapped in a crossed optical dipole trap and cooled by evaporation. Condensates of approximately 10{sup 4} atoms have been obtained. From an expansion of the condensate, we have extracted the scattering length a{sub 170}=3.6{+-}0.9 nm.

  6. Power Scaling of Ytterbium-doped Fiber Superfluorescent Sources

    Microsoft Academic Search

    Pu Wang; Jayanta K. Sahu; W. Andrew Clarkson

    2007-01-01

    Power scaling of ytterbium-doped fiber superfluorescent sources based on single-stage and two-stage cladding-pumped fiber configurations is reported. For the single-stage configuration, a novel fiber-end termination scheme was employed to suppress laser oscillation in combination with a simple all-fiber scheme for achieving a predominantly single-ended output. The fiber was cladding-pumped by a diode stack at 976 nm and yielded ~62 W

  7. 33 CFR 175.110 - Visual distress signals required.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Visual distress signals required. 175.110 Section 175.110...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.110 Visual distress signals required. (a) No person may use...

  8. 33 CFR 175.110 - Visual distress signals required.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Visual distress signals required. 175.110 Section 175.110...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.110 Visual distress signals required. (a) No person may use...

  9. 33 CFR 175.130 - Visual distress signals accepted.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Visual distress signals accepted. 175.130 Section 175.130...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.130 Visual distress signals accepted. (a) Any of the following...

  10. 33 CFR 175.130 - Visual distress signals accepted.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Visual distress signals accepted. 175.130 Section 175.130...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.130 Visual distress signals accepted. (a) Any of the following...

  11. 33 CFR 175.110 - Visual distress signals required.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Visual distress signals required. 175.110 Section 175.110...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.110 Visual distress signals required. (a) No person may use...

  12. 33 CFR 175.110 - Visual distress signals required.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Visual distress signals required. 175.110 Section 175.110...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.110 Visual distress signals required. (a) No person may use...

  13. 33 CFR 175.110 - Visual distress signals required.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Visual distress signals required. 175.110 Section 175.110...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.110 Visual distress signals required. (a) No person may use...

  14. 33 CFR 175.130 - Visual distress signals accepted.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Visual distress signals accepted. 175.130 Section 175.130...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.130 Visual distress signals accepted. (a) Any of the following...

  15. 33 CFR 175.130 - Visual distress signals accepted.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Visual distress signals accepted. 175.130 Section 175.130...SAFETY EQUIPMENT REQUIREMENTS Visual Distress Signals § 175.130 Visual distress signals accepted. (a) Any of the following...

  16. 25 CFR 175.22 - Requirements for receiving electrical service.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... false Requirements for receiving electrical service. 175.22 Section 175...175.22 Requirements for receiving electrical service. In addition to the other...the customer, in order to receive electrical service, shall enter into a...

  17. 25 CFR 175.22 - Requirements for receiving electrical service.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... false Requirements for receiving electrical service. 175.22 Section 175...175.22 Requirements for receiving electrical service. In addition to the other...the customer, in order to receive electrical service, shall enter into a...

  18. 25 CFR 175.22 - Requirements for receiving electrical service.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... true Requirements for receiving electrical service. 175.22 Section 175...175.22 Requirements for receiving electrical service. In addition to the other...the customer, in order to receive electrical service, shall enter into a...

  19. 25 CFR 175.22 - Requirements for receiving electrical service.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... false Requirements for receiving electrical service. 175.22 Section 175...175.22 Requirements for receiving electrical service. In addition to the other...the customer, in order to receive electrical service, shall enter into a...

  20. 25 CFR 175.22 - Requirements for receiving electrical service.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... false Requirements for receiving electrical service. 175.22 Section 175...175.22 Requirements for receiving electrical service. In addition to the other...the customer, in order to receive electrical service, shall enter into a...

  1. 49 CFR 175.9 - Special aircraft operations.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Special aircraft operations. 175.9 Section 175...MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT General Information and Regulations § 175.9 Special aircraft operations. (a) This...

  2. 49 CFR 175.9 - Special aircraft operations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Special aircraft operations. 175.9 Section 175...MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT General Information and Regulations § 175.9 Special aircraft operations. (a) This...

  3. 49 CFR 175.9 - Special aircraft operations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Special aircraft operations. 175.9 Section 175...MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT General Information and Regulations § 175.9 Special aircraft operations. (a) This...

  4. 49 CFR 175.9 - Special aircraft operations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Special aircraft operations. 175.9 Section 175...MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT General Information and Regulations § 175.9 Special aircraft operations. (a) This...

  5. 14 CFR 93.175 - Applicability.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...CONTINUED) AIR TRAFFIC AND GENERAL OPERATING RULES SPECIAL AIR TRAFFIC RULES Special Flight Rules in the Vicinity of Luke AFB, AZ § 93.175 Applicability. This subpart prescribes a Special Air Traffic Rule for aircraft conducting VFR...

  6. 14 CFR 93.175 - Applicability.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...CONTINUED) AIR TRAFFIC AND GENERAL OPERATING RULES SPECIAL AIR TRAFFIC RULES Special Flight Rules in the Vicinity of Luke AFB, AZ § 93.175 Applicability. This subpart prescribes a Special Air Traffic Rule for aircraft conducting VFR...

  7. 14 CFR 93.175 - Applicability.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...CONTINUED) AIR TRAFFIC AND GENERAL OPERATING RULES SPECIAL AIR TRAFFIC RULES Special Flight Rules in the Vicinity of Luke AFB, AZ § 93.175 Applicability. This subpart prescribes a Special Air Traffic Rule for aircraft conducting VFR...

  8. 7 CFR 65.175 - Ground pork.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...COUNTRY OF ORIGIN LABELING OF BEEF, PORK, LAMB, CHICKEN, GOAT MEAT, PERISHABLE AGRICULTURAL COMMODITIES, MACADAMIA NUTS, PECANS, PEANUTS, AND GINSENG General Provisions Definitions § 65.175 Ground pork. Ground pork means comminuted...

  9. 7 CFR 65.175 - Ground pork.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...COUNTRY OF ORIGIN LABELING OF BEEF, PORK, LAMB, CHICKEN, GOAT MEAT, PERISHABLE AGRICULTURAL COMMODITIES, MACADAMIA NUTS, PECANS, PEANUTS, AND GINSENG General Provisions Definitions § 65.175 Ground pork. Ground pork means comminuted...

  10. 7 CFR 65.175 - Ground pork.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...COUNTRY OF ORIGIN LABELING OF BEEF, PORK, LAMB, CHICKEN, GOAT MEAT, PERISHABLE AGRICULTURAL COMMODITIES, MACADAMIA NUTS, PECANS, PEANUTS, AND GINSENG General Provisions Definitions § 65.175 Ground pork. Ground pork means comminuted...

  11. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Interior NONDISCRIMINATION IN FEDERALLY ASSISTED PROGRAMS OF THE DEPARTMENT OF THE INTERIOR Nondiscrimination on the Basis of Race, Color, or National Origin § 17.5 Compliance information. (a) Cooperation and assistance. The...

  12. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Interior NONDISCRIMINATION IN FEDERALLY ASSISTED PROGRAMS OF THE DEPARTMENT OF THE INTERIOR Nondiscrimination on the Basis of Race, Color, or National Origin § 17.5 Compliance information. (a) Cooperation and assistance. The...

  13. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Interior NONDISCRIMINATION IN FEDERALLY ASSISTED PROGRAMS OF THE DEPARTMENT OF THE INTERIOR Nondiscrimination on the Basis of Race, Color, or National Origin § 17.5 Compliance information. (a) Cooperation and assistance. The...

  14. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Interior NONDISCRIMINATION IN FEDERALLY ASSISTED PROGRAMS OF THE DEPARTMENT OF THE INTERIOR Nondiscrimination on the Basis of Race, Color, or National Origin § 17.5 Compliance information. (a) Cooperation and assistance. The...

  15. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Interior NONDISCRIMINATION IN FEDERALLY ASSISTED PROGRAMS OF THE DEPARTMENT OF THE INTERIOR Nondiscrimination on the Basis of Race, Color, or National Origin § 17.5 Compliance information. (a) Cooperation and assistance. The...

  16. 32 CFR 644.175 - Cross Reference.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...National Defense Department of Defense (Continued) DEPARTMENT OF THE ARMY (CONTINUED) REAL PROPERTY REAL ESTATE HANDBOOK Relocation Assistance Program § 644.175 Cross Reference. See part 641 of this chapter for the regulations on...

  17. 32 CFR 644.175 - Cross Reference.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...National Defense Department of Defense (Continued) DEPARTMENT OF THE ARMY (CONTINUED) REAL PROPERTY REAL ESTATE HANDBOOK Relocation Assistance Program § 644.175 Cross Reference. See part 641 of this chapter for the regulations on...

  18. 32 CFR 644.175 - Cross Reference.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...National Defense Department of Defense (Continued) DEPARTMENT OF THE ARMY (CONTINUED) REAL PROPERTY REAL ESTATE HANDBOOK Relocation Assistance Program § 644.175 Cross Reference. See part 641 of this chapter for the regulations on...

  19. 40 CFR 61.175 - Monitoring requirements.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...PROGRAMS (CONTINUED) NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS National Emission Standard for Inorganic Arsenic Emissions From Primary Copper Smelters § 61.175 Monitoring requirements. (a) Each owner or operator of a...

  20. 40 CFR 61.175 - Monitoring requirements.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...PROGRAMS (CONTINUED) NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS National Emission Standard for Inorganic Arsenic Emissions From Primary Copper Smelters § 61.175 Monitoring requirements. (a) Each owner or operator of a...

  1. 40 CFR 61.175 - Monitoring requirements.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...PROGRAMS (CONTINUED) NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS National Emission Standard for Inorganic Arsenic Emissions From Primary Copper Smelters § 61.175 Monitoring requirements. (a) Each owner or operator of a...

  2. SEARCH FOR NEW YTTERBIUM-BASED HEAVY FERMION COMPOUNDS D. Bollinger, E. Morosan1

    E-print Network

    Mellor-Crummey, John

    substituted Ytterbium with the more predictable Gadolinium and increased the ratio of rare earth metal in Physics and Astronomy and Chemistry at Rice University #12;SEARCH FOR NEW YTTERBIUM-BASED HEAVY FERMION COMPOUNDS http://nanojapan.rice.edu This material is based upon work supported

  3. Magnetocrystalline anisotropy of ytterbium iron garnet Yb3Fe5O12

    Microsoft Academic Search

    R F Pearson

    1965-01-01

    The anisotropy of ytterbium iron garnet and ytterbium-doped yttrium iron garnet has been measured by the torque method in applied fields of 15 000 Oe at temperatures between 1.5 °K and 300 °K. Theoretical values of the anisotropy were calculated from optical energy level data derived by other workers and these were compared with the experimental results. At temperatures below

  4. LBNL-42730 1 Collisional Perturbation of States in Atomic Ytterbium by Helium and Neon

    E-print Network

    Budker, Dmitry

    LBNL-42730 1 Collisional Perturbation of States in Atomic Ytterbium by Helium and Neon D, CA 94720 Results of an investigation of collisional de-excitation of the metastable 6s6p 3 P0 state in atomic ytterbium by helium and neon buffer gases are reported. We find upper limits for the quenching

  5. Probe measurements of the electron distribution function in an electron-beam-produced ytterbium plasma

    SciTech Connect

    Bobrova, A. A.; Dubinov, A. E.; Esin, M. I.; Zolotov, S. V.; Maksimov, A. N.; Selemir, V. D.; Sidorov, I. I.; Shubin, A. Yu. [Russian Federal Nuclear Center, All-Russia Research Institute of Experimental Physics (Russian Federation)

    2011-01-15

    A nonequilibrium anisotropic plasma produced by an electron beam in the residual air with a low content of ytterbium vapor was investigated by the probe method. It is found that a minor (at a level of a few ppm) admixture of ytterbium to low-pressure air substantially modifies the electron energy distribution function (EEDF): the main peak corresponding to thermal electrons broadens, and new peaks appear. It is shown that the observed change in the EEDF is caused by the low ionization energy of ytterbium, due to which one beam electron can ionize several ytterbium atoms. The new peaks in the EEDF correspond to the final energies of a beam electron after each subsequent ionizing collision with ytterbium atoms.

  6. High power ytterbium-doped fiber lasers — fundamentals and applications

    NASA Astrophysics Data System (ADS)

    Zervas, Michalis N.

    2014-03-01

    In this paper, we summarize the fundamental properties and review the latest developments in high power ytterbium-doped fiber (YDF) lasers. The review is focused primarily on the main fiber laser configurations and the related cladding pumping issues. Special attention is placed on pump combination techniques and the parameters that affect the brightness enhancements observed in high power fiber lasers. The review also includes the major limitations imposed by fiber nonlinearities and other parasitic effects, such as optical damage, modal instabilities and photodarkening. The paper summarizes the power evolution in continuous-wave (CW) and pulsed YDF lasers and their impact on material processing and other industrial applications.

  7. Crystal structure of hexa-aqua-dichlorido-ytterbium(III) chloride.

    PubMed

    Knopf, Kevin M; Crundwell, Guy; Westcott, Barry L

    2015-06-01

    The crystal structure of the title compound, [YbCl2(H2O)6]Cl, was determined at 110?K. Samples were obtained from evaporated aceto-nitrile solutions containing the title compound, which consists of a [YbCl2(H2O)6](+) cation and a Cl(-) anion. The cations in the title compound sit on a twofold axis and form O-H?Cl hydrogen bonds with the nearby Cl(-) anion. The coordination geometry around the metal centre forms a distorted square anti-prism. The ytterbium complex is isotypic with the europium complex [Tambrornino et al. (2014 ?). Acta Cryst. E70, i27]. PMID:26090164

  8. Crystal structure of hexa­aqua­dichlorido­ytterbium(III) chloride

    PubMed Central

    Knopf, Kevin M.; Crundwell, Guy; Westcott, Barry L.

    2015-01-01

    The crystal structure of the title compound, [YbCl2(H2O)6]Cl, was determined at 110?K. Samples were obtained from evaporated aceto­nitrile solutions containing the title compound, which consists of a [YbCl2(H2O)6]+ cation and a Cl? anion. The cations in the title compound sit on a twofold axis and form O—H?Cl hydrogen bonds with the nearby Cl? anion. The coordination geometry around the metal centre forms a distorted square anti­prism. The ytterbium complex is isotypic with the europium complex [Tambrornino et al. (2014 ?). Acta Cryst. E70, i27]. PMID:26090164

  9. Waveguide lasers in ytterbium-doped tantalum pentoxide on silicon.

    PubMed

    Aghajani, A; Murugan, G S; Sessions, N P; Apostolopoulos, V; Wilkinson, J S

    2015-06-01

    A waveguide laser in an ytterbium-doped tantalum pentoxide film is reported. The waveguide is formed of a rib of sputtered tantalum pentoxide on top of oxidized silicon with an over-cladding of silica. Emission at a wavelength of 1025 nm was achieved with an absorbed pump power threshold and slope efficiency of ?29??mW and 27%, respectively, for a cavity formed by a high reflector mirror and an estimated 12% Fresnel reflection from the bare end-face at the output. PMID:26030554

  10. 175RESONANCE February 2014 SERIES ARTICLE

    E-print Network

    Joshi, Yogesh Moreshwar

    175RESONANCE February 2014 SERIES ARTICLE Circadian Rhythms 4. Why do Living Organisms Have Them the series of articles on circadian rhythms, we saw that living organisms exhibit daily rhythms in multiple this article with a question ­ "Why do living organisms have circadian clocks?". Although we are talking about

  11. Marine Biology 111, 175-181 (1991)

    E-print Network

    1991-01-01

    Marine Biology 111, 175-181 (1991) Marine ::~~ Biology© Springer-Verlag 1991 Uptake of dissolved organics by marine bacteria as a function of fluid motion B. E. Logan 1 and D. L. Kirchman 2 1, USA 2 College of Marine Studies, University of Delaware, Lewes, Deleware 19958, USA Date of final

  12. Processing and properties of ytterbium-erbium silicate thin film gain media

    E-print Network

    Kimerling, Lionel C.

    The structural and photoluminescence properties of ytterbium-erbium silicate thin films have been investigated. The films were fabricated by RF-magnetron co-sputtering of Er[subscript 2]O[subscript 3], Yb[subscript ...

  13. [Hygienic regulation of yttrium, terbium, ytterbium and lutetium fluorides in the air of the workplace].

    PubMed

    Neizvestnova, E M; Grekhova, T D; Privalova, L I; Babakova, O M; Konovalova, N E; Petelina, E V

    1994-01-01

    The study (experiments on animals and on culture of rats' peritoneal macrophages) covered fluorides of rare-earth metals (REM) assigned to yttrium group--yttrium, terbium, ytterbium, lutetium. Fluorides of REM have low toxicity and cumulativity, induce no local irritation of skin and eyes. Fluorides of yttrium, terbium and lutetium, if administered into stomach, result in specific intoxication (fluorosis). Fluoride of ytterbium did not cause such intoxication. According to short-term tests of cytotoxicity, the foreseeable fibrogenic danger for ytterbium fluoride is moderate, for fluorides of yttrium, terbium and lutetium is mild. The authors recommend to control the level of yttrium, terbium and lutetium fluorides in the air of workplace through the MACs for the fluorides at 2.5 mg/cu m (maximal single concentration) and 0.5 mg/cu m (average shift concentration), the level of ytterbium fluoride as moderate fibrogenic dust at 6 mg/cu m. PMID:7881860

  14. Reactivity of ytterbium(II) silylamide supported by a pyrrolyl-cyclopentadienyl ligand.

    PubMed

    Li, Jianfeng; Hao, Jingjun; Cui, Chunming

    2015-01-14

    Reactivity of a divalent ytterbium amide LYbN(SiMe3)2 (1, L = Me4C5-SiMe2-NC4H4) supported by a pyrrolyl functionalized cyclopentadienyl ligand has been investigated. Reactions of 1 with the element sulfur led to the oxidation of the ytterbium to yield the disulfide-bridged ytterbium complex [LYbN(SiMe3)2]2(?-?(2):?(2)-S2) (2) while that with AgBPh4 resulted in the oxidation of the amide ligand to yield the divalent ytterbium complex LYb(BPh4) (3) along with the formation of silver and the N-N coupling product [N(SiMe3)2]2. Reactions of 1 with phenol, phenylacetylene and aniline led to the formation of the corresponding ytterbium aryloxide [LYb(?-OAr(1))]2 (4, Ar(1) = 2,6-tBu2-4-MeC6H2), ytterbium alkynyl complex [LYb(?-C?CAr(2))]2 (5, Ar(2) = 4-tBuC6H4) and ytterbium amide [(Me4C5-SiMe2-NHAr(3))Yb(?-NHAr(3))]2 (6, Ar(3) = 2,6-iPr2C6H3), respectively. The structural analysis of the reaction products revealed that the silyl bridged pyrrolyl arm is not coordinated to the ytterbium center in compounds 2, 4 and 5. The formation of 6 involved the cleavage of the Si-Npyrrole bond, the same bond cleavage was also observed in the reaction of 1 with red phosphorus, leading to the pyrrolide bridged complex [LYb(?-?(1):?(5)-NC4H4)]2 (7). PMID:25407233

  15. Evaluation of hybrid ytterbium–neodymium laser amplification at 1053 nm

    Microsoft Academic Search

    J. Wemans; C. P. João; G. Figueira

    2010-01-01

    We present here the modeling of a hybrid neodymium\\/ytterbium laser chain. The laser chain is modeled in energy, spectrum and\\u000a gain for a relevant choice of ytterbium host materials. Special attention is given to spectral matching of both technologies.\\u000a The model performance is benchmarked by an experimental setup of a Yb:glass regenerative-amplifier. Results indicate Yb:CaF2 to be the best material

  16. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Readjustment for local advertising charges. 53.175 Section 53... § 53.175 Readjustment for local advertising charges. (a) In general...reimbursement of expenses for local advertising of the article or any other...

  17. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Readjustment for local advertising charges. 53.175 Section 53... § 53.175 Readjustment for local advertising charges. (a) In general...reimbursement of expenses for local advertising of the article or any other...

  18. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2011-04-01 true Readjustment for local advertising charges. 53.175 Section 53... § 53.175 Readjustment for local advertising charges. (a) In general...reimbursement of expenses for local advertising of the article or any other...

  19. 7 CFR 1260.175 - Late-payment charge.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Late-payment charge. 1260.175 Section...DEPARTMENT OF AGRICULTURE BEEF PROMOTION AND RESEARCH Beef Promotion and Research Order Assessments § 1260.175 Late-payment charge. Any...

  20. 7 CFR 1260.175 - Late-payment charge.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 2011-01-01 false Late-payment charge. 1260.175 Section...DEPARTMENT OF AGRICULTURE BEEF PROMOTION AND RESEARCH Beef Promotion and Research Order Assessments § 1260.175 Late-payment charge. Any...

  1. 49 CFR 175.9 - Exceptions for special aircraft operations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... false Exceptions for special aircraft operations. 175.9 Section...MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT General Information and Regulations...175.9 Exceptions for special aircraft operations. This...

  2. 42 CFR 411.175 - Basis for Medicare primary payments.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 2014-10-01 false Basis for Medicare primary payments. 411.175 Section...175 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES MEDICARE PROGRAM EXCLUSIONS FROM...

  3. 42 CFR 411.175 - Basis for Medicare primary payments.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 2011-10-01 false Basis for Medicare primary payments. 411.175 Section...175 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES MEDICARE PROGRAM EXCLUSIONS FROM...

  4. 42 CFR 411.175 - Basis for Medicare primary payments.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 2013-10-01 false Basis for Medicare primary payments. 411.175 Section...175 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES MEDICARE PROGRAM EXCLUSIONS FROM...

  5. 42 CFR 411.175 - Basis for Medicare primary payments.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 2012-10-01 false Basis for Medicare primary payments. 411.175 Section...175 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES MEDICARE PROGRAM EXCLUSIONS FROM...

  6. 21 CFR 133.175 - Pasteurized cheese spread.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Pasteurized cheese spread. 133.175 Section 133.175 Food and...SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION CHEESES AND RELATED CHEESE PRODUCTS Requirements for Specific...

  7. 21 CFR 133.175 - Pasteurized cheese spread.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Pasteurized cheese spread. 133.175 Section 133.175 Food and...SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION CHEESES AND RELATED CHEESE PRODUCTS Requirements for Specific...

  8. 14 CFR 27.175 - Demonstration of static longitudinal stability.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 2010-01-01 false Demonstration of static longitudinal stability. 27.175 Section...Characteristics § 27.175 Demonstration of static longitudinal stability. (a) Climb. Static longitudinal stability must be shown in...

  9. 14 CFR 29.175 - Demonstration of static longitudinal stability.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 2010-01-01 false Demonstration of static longitudinal stability. 29.175 Section...Characteristics § 29.175 Demonstration of static longitudinal stability. (a) Climb. Static longitudinal stability must be shown in...

  10. 14 CFR 23.175 - Demonstration of static longitudinal stability.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Demonstration of static longitudinal stability. 23.175 Section...Flight Stability § 23.175 Demonstration of static longitudinal stability. Static longitudinal stability must be shown as...

  11. 13 CFR 120.175 - Coastal barrier islands.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... Section 120.175 Business Credit and Assistance SMALL BUSINESS ADMINISTRATION BUSINESS LOANS Policies Applying to All Business Loans Requirements Imposed Under Other Laws and Orders § 120.175 Coastal barrier islands....

  12. 40 CFR 68.175 - Prevention program/Program 3.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Prevention program/Program 3. 68.175 Section...PROGRAMS (CONTINUED) CHEMICAL ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.175 Prevention program/Program 3....

  13. 10 CFR 52.175 - Transfer of manufacturing license.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 false Transfer of manufacturing license. 52.175 Section 52...APPROVALS FOR NUCLEAR POWER PLANTS Manufacturing Licenses § 52.175 Transfer of manufacturing license. A manufacturing license...

  14. 10 CFR 52.175 - Transfer of manufacturing license.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 false Transfer of manufacturing license. 52.175 Section 52...APPROVALS FOR NUCLEAR POWER PLANTS Manufacturing Licenses § 52.175 Transfer of manufacturing license. A manufacturing license...

  15. 10 CFR 52.175 - Transfer of manufacturing license.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 false Transfer of manufacturing license. 52.175 Section 52...APPROVALS FOR NUCLEAR POWER PLANTS Manufacturing Licenses § 52.175 Transfer of manufacturing license. A manufacturing license...

  16. 10 CFR 52.175 - Transfer of manufacturing license.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 false Transfer of manufacturing license. 52.175 Section 52...APPROVALS FOR NUCLEAR POWER PLANTS Manufacturing Licenses § 52.175 Transfer of manufacturing license. A manufacturing license...

  17. 10 CFR 52.175 - Transfer of manufacturing license.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...2013-01-01 false Transfer of manufacturing license. 52.175 Section 52...APPROVALS FOR NUCLEAR POWER PLANTS Manufacturing Licenses § 52.175 Transfer of manufacturing license. A manufacturing license...

  18. 40 CFR 98.175 - Procedures for estimating missing data.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...estimating missing data. 98.175 Section...REPORTING Iron and Steel Production § 98.175 Procedures...estimating missing data. A complete...emission factor if data on the CO2 emission rate, process production rate or process...

  19. 45 CFR 17.5 - Context to be reflected.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...17.5 Public Welfare DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL ADMINISTRATION RELEASE OF ADVERSE INFORMATION TO NEWS MEDIA § 17.5 Context to be reflected. The authority for and the character of the information shall be made clear,...

  20. 45 CFR 17.5 - Context to be reflected.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...17.5 Public Welfare DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL ADMINISTRATION RELEASE OF ADVERSE INFORMATION TO NEWS MEDIA § 17.5 Context to be reflected. The authority for and the character of the information shall be made clear,...

  1. 45 CFR 17.5 - Context to be reflected.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...17.5 Public Welfare Department of Health and Human Services GENERAL ADMINISTRATION RELEASE OF ADVERSE INFORMATION TO NEWS MEDIA § 17.5 Context to be reflected. The authority for and the character of the information shall be made clear,...

  2. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Readjustment for local advertising charges. 53.175 Section 53... § 53.175 Readjustment for local advertising charges. (a) In general...reimbursement of expenses for local advertising of the article or any other...

  3. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Readjustment for local advertising charges. 53.175 Section 53... § 53.175 Readjustment for local advertising charges. (a) In general...reimbursement of expenses for local advertising of the article or any other...

  4. Interactions in the Ultracold Lithium - Ytterbium 3 P2 System

    NASA Astrophysics Data System (ADS)

    Dowd, William H.

    I detail the execution and results of experiments in a mixture of ultracold atomic gases using fermionic lithium (6Li) and bosonic ytterbium (174Yb) in the metastable 3P2 state. We demonstrate efficient transfer of ground state Yb atoms to this metastable state in the presence of Li. A method to spin-purify the resulting metastable Yb atoms via a magnetic gradient is presented. We investigate intra-species and inter-species inelastic collisions over a wide range of magnetic fields. The resulting inelastic spectrum is linked to a potential collisional resonance between the m J= --1 metastable state of Yb and ground state Li near 450G. This work begins the path towards creation of trapped ultracold and magnetic ground state molecules. Such molecules allow experiments which cannot be accessed by current generations of bi-alkali molecule experiments.

  5. Spectroscopic properties of lead fluoroborate glasses doped with ytterbium

    NASA Astrophysics Data System (ADS)

    Kassab, Luciana; Tatumi, Sonia H.; Morais, Alessandro; Courrol, Lilia C.; Wetter, Niklaus U.; Salvador, V.

    2001-05-01

    A new lead fluoroborate glass (PbO-PbF2-B2O3) doped with ytterbium (Yb:PbFB) is presented. Samples with different concentrations of Yb3+ were produced and had their emission cross-sections, fluorescence lifetimes and minimum pump intensities determined. They have high refractive index of 2.2 and a density of 4.4 g/cm3. For a doping level of 1.153x1020 ions/cm3, the fluorescence lifetime, after excitation at 968 nm, is 0.81 ms, which is comparable to Yb:tellurite laser glass. Also, an emission band at 1022 nm is measured with emission cross-section of approximately 1.07x10-20 cm2 and fluorescence effective linewidth of 60 nm, which is comparable to Yb:phosphate laser glass.

  6. Spectroscopic properties of lead fluoroborate glasses doped with ytterbium.

    PubMed

    Kassab, L; Tatumi, S; Morais, A; Courrol, L; Wetter, N; Salvador, V

    2001-05-01

    A new lead fluoroborate glass (PbO-PbF2-B2O3) doped with ytterbium (Yb:PbFB) is presented. Samples with different concentrations of Yb3+ were produced and had their emission cross-sections, fluorescence lifetimes and minimum pump intensities determined. They have high refractive index of 2.2 and a density of 4.4 g/cm3. For a doping level of 1.153x1020 ions/cm3, the fluorescence lifetime, after excitation at 968 nm, is 0.81 ms, which is comparable to Yb:tellurite laser glass. Also, an emission band at 1022 nm is measured with emission cross-section of approximately 1.07x10-20 cm2 and fluorescence effective linewidth of 60 nm, which is comparable to Yb:phosphate laser glass. PMID:19417856

  7. High peak power ytterbium-doped fiber amplifiers

    NASA Astrophysics Data System (ADS)

    Torruellas, W.; Chen, Y.; McIntosh, B.; Farroni, J.; Tankala, K.; Webster, S.; Hagan, D.; Soileau, M. J.; Messerly, M.; Dawson, J.

    2006-02-01

    We have tested a series of Ytterbium doped large core fibers operating near 10Kpps and producing pulses of approximately 1ns. We have achieved 0.85mJ/pulse resulting in peak powers in excess of 2MW with 0.4ns pulses and near diffraction limited beams. In another fiber, we have achieved over 1.5mJ/pulse with pulses of 900ps corresponding to 1.65MW of peak power and M2 of 2.5. In the latter case, wall-plug efficiencies, excluding cooling of the pump diode lasers, in excess of 15% were also achieved. This fiber amplifier has operated for 2 months without any degradation or observed optical damage.

  8. Structural and Electronic Transitions in Ytterbium Metal to 202 GPa

    SciTech Connect

    Chesnut, G.N.; Vohra, Y.K. [Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, Alabama 35294-1170 (United States)] [Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, Alabama 35294-1170 (United States)

    1999-02-01

    Ytterbium (Yb), a member of the rare earth group metals with a filled f shell and a divalent electronic character, has been studied under static high pressures in a diamond anvil cell to 202thinspthinspGPa. We report a new transformation from a face-centered-cubic structure to a hexagonal phase with 3thinspthinspatoms/cell (space group P3{sub 1}21 referred to as hP3 ) at 98{plus_minus}5 GPa . This hP3 phase is similar to that observed in trivalent neodymium and samarium at pressures near 40thinspthinspGPa. Our high pressure study thus clearly demonstrates that Yb is no longer an {open_quotes}irregular{close_quotes} member of the rare earth metals, and divalent to trivalent electronic transition is completed at megabar pressures. {copyright} {ital 1999} {ital The American Physical Society}

  9. 46 CFR 172.175 - Character of damage.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Shipping 7 2010-10-01 2010-10-01 false Character of damage. 172.175 Section 172.175 Shipping...Regulated Under Subchapter O of This Chapter § 172.175 Character of damage. (a) If a type IG hull is required,...

  10. 40 CFR 63.175 - Quality improvement program for valves.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...false Quality improvement program for valves. 63.175 Section 63.175 Protection...175 Quality improvement program for valves. (a) In Phase III, an owner...unit has fewer than 2 percent leaking valves, calculated as a rolling average of...

  11. 40 CFR 63.175 - Quality improvement program for valves.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...false Quality improvement program for valves. 63.175 Section 63.175 Protection...175 Quality improvement program for valves. (a) In Phase III, an owner...unit has fewer than 2 percent leaking valves, calculated as a rolling average of...

  12. 40 CFR 63.175 - Quality improvement program for valves.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...false Quality improvement program for valves. 63.175 Section 63.175 Protection...175 Quality improvement program for valves. (a) In Phase III, an owner...unit has fewer than 2 percent leaking valves, calculated as a rolling average of...

  13. Quantum Frequency Conversion for Ytterbium Ion Based Quantum Repeaters

    NASA Astrophysics Data System (ADS)

    Clark, Ryan A.

    Quantum key distribution systems represent a proven method to obtain fundamentally secure communication channels. However, the loss of entangled photons which create the encryption key limit the distance over which the systems are useful. Quantum repeaters have been used to increase the distance over which entangled photons can be transmitted. The most successful quantum repeaters entangle information between trapped ions and single photons and through the use of entanglement swapping protocols, relay the encryption keys over large distances. A requirement of these quantum repeaters is the ability to work in the telecom wavelengths (1310 nm or 1550 nm), where standard silica fibers exhibit low loss. With the majority of ions emitting in the ultraviolet and visible spectrum, and ytterbium in particular emitting at 369.5 nm, a conversion process is then needed that can translate the photons from 369.5 nm to the telecom band while preserving the entangled state. The experiment presented here details the first stage of a nonlinear frequency conversion setup that uses strong pump light to enable the conversion of 369.5 nm photons to 708 nm. The efficiency of the conversion process is analyzed to determine the optimum system parameters, with an initial single pass conversion efficiency of 0.20% achieved. Noise introduced during the nonlinear conversion process is examined to determine the effect it presents on the communication channel.

  14. High-power output of ytterbium-doped oxyorthosilicate lasers at 1018 nm

    NASA Astrophysics Data System (ADS)

    Lin, Niannian; Li, Wenxue; Zhou, Yuan; Shi, Yi; Yan, Ming; Yang, Kangwen; Zhao, Jian; Yang, Xianghui; Zeng, Heping

    2013-01-01

    A high-power laser system at 1018 nm was realized with an ytterbium-doped oxyorthosilicate solid-state master oscillator and ytterbium-doped double-clad fiber amplifier. In the Yb:LSO (Yb:Lu2SiO5) and Yb:LYSO (Yb:LuYSiO5) master laser oscillator, we attained the broadest tunable wavelength range from 994.50 to 1094.22 nm. In the power amplifier, we achieved an output power up to 4.14 W at 1018 nm by amplifying the Yb:LSO laser under a pump power of 15.8 W.

  15. Analysis of inhomogeneous-excitation frequency shifts of ytterbium optical lattice clocks

    NASA Astrophysics Data System (ADS)

    Chen, Ning; Xu, Xinye

    2015-01-01

    We have investigated the frequency shifts caused by inhomogeneous excitation in a 171Yb optical lattice clock. The dependences of the inhomogeneity on the temperature of the cold ytterbium atoms and the misaligning angle between the lattice laser and the clock laser are analyzed by numerical calculations. The dependence of the fractional collisional frequency shift on the ground state fraction under different cold atom temperatures, atom numbers, lattice trap depths and unequal transverse and longitudinal temperatures are also shown. The results show that the uncertainty of the ytterbium clocks, contributed by the inhomogeneous excitation, can be reduced to be 10?19 or even lower with certain conditions.

  16. Solid state reactions of nanocrystalline Ce{sub 0.5}Yb{sub 0.5}O{sub 1.75} mixed oxide with high surface area silica in oxidizing and reducing atmosphere

    SciTech Connect

    Malecka, Malgorzata A. [Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2 (Poland); Kepinski, Leszek, E-mail: L.Kepinski@int.pan.wroc.pl [Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2 (Poland)

    2012-08-15

    The interaction of nanocrystalline Ce{sub 0.5}Yb{sub 0.5}O{sub 1.75} mixed oxide with a high surface amorphous silica support in an oxidizing and reducing atmosphere was studied by XRD, HRTEM, SAED, SEM and BET techniques. The Ce{sub 0.5}Yb{sub 0.5}O{sub 1.75}-SiO{sub 2} system shows very high structural and size stability in the oxidizing atmosphere up to 1000 Degree-Sign C, but in hydrogen spreading of the oxide onto silica occurs at temperatures above 800 Degree-Sign C. In the oxidizing atmosphere stability of the mixed oxide is limited by extraction of ytterbium from the oxide driven by a tendency to form ytterbium silicates. A new polymorph of Yb silicate, isomorphic with y-Y{sub 2}Si{sub 2}O{sub 7} (yttrialite), has been identified in the samples containing the mixed Ce-Yb oxide. The absence of y-Yb{sub 2}Si{sub 2}O{sub 7} silicate in the Yb{sub 2}O{sub 3}-SiO{sub 2} samples treated in similar conditions indicates that Ce{sup 4+} ions are needed to stabilize the structure. - Graphical abstract: Structure evolution of nano-Ce{sub 0.5}Yb{sub 0.5}O{sub 1.75}-SiO{sub 2} in air and in H{sub 2}. Highlights: Black-Right-Pointing-Pointer Nano-Ce{sub 0.50}Yb{sub 0.50}O{sub 1.75} on SiO{sub 2} is stable in air up to 1000 Degree-Sign C but spreads in hydrogen at 800 Degree-Sign C. Black-Right-Pointing-Pointer Formation of Yb silicates determines the stability of Ce{sub 0.50}Yb{sub 0.50}O{sub 1.75} at high temperatures. Black-Right-Pointing-Pointer New, y-Yb{sub 2}Si{sub 2}O{sub 7} silicate (yttrialite type) forms in Ce{sub 0.5}Yb{sub 0.5}O{sub 1.75}-SiO{sub 2} in H{sub 2} at 1100 Degree-Sign C.

  17. Studies of neutral ytterbium atoms in a solid neon matrix

    NASA Astrophysics Data System (ADS)

    Xu, Chenyu

    Ytterbium (Yb) atoms frozen in a solid neon (Ne) matrix qualitatively retain the structure of free atoms. Most of the Yb transitions are found to be blue-shifted in both absorption and emission spectra. Transitions also acquire significantly broadened linewidth, which can be a few nanometers for outer-shell transitions and as narrow as 0.03 nm (or 120 GHz) for inner-shell transitions. We explicitly demonstrate that the linewidth broadening is homogeneous for the 6s2 1S 0 - 6s6p 1 P1 transition. Splitting of transitions is observed as well, and is attributed to the broken spherical symmetry of the Yb trapping sites in solid Ne. The lifetimes of 6s6p 3 P0,1 in both 171Yb and 172Yb are measured in solid Ne using the spectrally-resolved fluorescence-decay technique. The finite vacuum lifetime of 6s6p 3P0 in 171Yb is due to the hyperfine quenching, and gives the natural linewidth of the Yb clock transition. With the measurements in solid Ne, we extract this vacuum lifetime for the first time after correcting for various medium effects. One effect is the index-of-refraction dependence of the spontaneous emission, of which we perform an independent calibration based on the 6s6p 3P1 lifetime in vacuum and in solid Ne. We obtain a vacuum decay rate of (4.42+/-0.35) x10--2 s--1for 6s6p 3P0 in 171Yb, which agrees with a recent calculation. The feasibility of optically polarizing 171Yb nuclei in solid Ne is discussed. The excitation rate of Yb transitions in solid Ne is suppressed by the same factor by which the absorption linewidth is broadened. The optical pumping efficiency for nuclear spins is estimated to be further suppressed by four orders of magnitude due to the presence of the crystal field.

  18. Optical properties of lutetium diphosphates powders doped by ytterbium

    NASA Astrophysics Data System (ADS)

    Béjaoui, A.; Horchani-Naifer, K.; Hraiech, S.; Férid, M.

    2013-12-01

    Sodium lutetium diphosphates doped with Yb3+ ions, NaLu1-xYbxP2O7 (x = 0.5%, 2%, 5% and 10%), were synthesized by solid state reaction. These samples were characterized by X-ray diffraction, Raman and infrared spectroscopies. The obtained powders are formed by single monoclinic phase of condensed diphosphate NaLuP2O7 crystallized with P21/n space group. The evolution of crystal lattice parameters varied as a function of the ytterbium concentration in these host lattices. Near infrared (NIR) and UV-Visible spectroscopies of Yb3+ in NaLuP2O7 powders, at room temperature (RT), are carried out. In the IR range, a broad band relative to the Stark levels of the Yb 4f configuration. Four Stark levels of the ground 2F7/2 state are located on the emission spectra between 970 nm and 1060 nm. It was shown that spectroscopic properties of investigated samples depend on the concentration ratio of Yb3+ ions. The decay times of infrared Yb3+ (2F5/2 excited state) fluorescence were in the range of 2.78-2.91 ms. The registered decay times of the emission at 1006 nm, under excitation with length 925 nm showed low sensibility to the Yb3+ concentration in NaLuP2O7. In the UV-Visible spectra, double band emission for the charge transfer band (CTB) luminescence of Yb3+ are observed under 266 nm excitation.

  19. 25 CFR 175.50 - Obtaining rights-of-way.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 2011-04-01 true Obtaining rights-of-way. 175.50 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Rights-of-Way § 175.50 Obtaining rights-of-way. Where there is no...

  20. 25 CFR 175.50 - Obtaining rights-of-way.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Obtaining rights-of-way. 175.50 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Rights-of-Way § 175.50 Obtaining rights-of-way. Where there is no...

  1. 25 CFR 175.50 - Obtaining rights-of-way.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Obtaining rights-of-way. 175.50 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Rights-of-Way § 175.50 Obtaining rights-of-way. Where there is no...

  2. 25 CFR 175.50 - Obtaining rights-of-way.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Obtaining rights-of-way. 175.50 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Rights-of-Way § 175.50 Obtaining rights-of-way. Where there is no...

  3. 25 CFR 175.50 - Obtaining rights-of-way.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Obtaining rights-of-way. 175.50 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Rights-of-Way § 175.50 Obtaining rights-of-way. Where there is no...

  4. High-quality laser cutting of stainless steel in inert gas atmosphere by ytterbium fibre and CO2 lasers

    NASA Astrophysics Data System (ADS)

    Golyshev, A. A.; Malikov, A. G.; Orishich, A. M.; Shulyat'ev, V. B.

    2014-03-01

    Processes of cutting stainless steel by ytterbium fibre and CO2 lasers have been experimentally compared. The cut surface roughnesses for 3- and 5-mm-thick stainless steel sheets are determined. The absorption coefficient of laser radiation during cutting is measured. It is established that the power absorbed by metal during cutting by the CO2 laser exceeds that for the ytterbium laser (provided that the cutting speed remains the same). The fact that the maximum cutting speed of the CO2 laser is lower than that of the ytterbium fibre laser is explained.

  5. SOLITONS AND OPTICAL FIBERS: Self-Q-switched ytterbium-doped cladding-pumped fibre laser

    NASA Astrophysics Data System (ADS)

    Grukh, Dmitrii A.; Kurkov, Andrei S.; Razdobreev, I. M.; Fotiadi, A. A.

    2002-11-01

    A self-Q-switched ytterbium-doped double-clad fibre laser is described. A samarium-doped fibre is used as a filter for protecting a pump source. A fibre coupler is employed to obtain a nonlinear feedback. The mechanism of pulse formation in the laser is considered, and the dependence of its output pulse on the coupler parameters is studied.

  6. Thermal Characteristics of an Ytterbium-Doped Fiber Amplifier Operating at 1060 and 1080 nm

    Microsoft Academic Search

    Luis Alonso Vazquez-Zuniga; Seunghwan Chung; Yoonchan Jeong

    2010-01-01

    We experimentally analyze the temperature dependence of an ytterbium-doped fiber amplifier (YDFA) operating at 1060 and 1080 nm, investigating its spectroscopic characteristics and gain properties in the temperature range of 10 to 100 °C. Our measurement indicates that the change in the operating temperature can give rise to a significant effect on the YDFA performance, which also significantly depends on

  7. 3-W saturation power polarization maintaining 1060-nm ytterbium fiber amplifier

    Microsoft Academic Search

    Valentin P. Gapontsev; Nikolay S. Platonov; Michael Vyatkin; Michael Meleshkevitch; Dimitry Spinov; Ilya Zaitsev

    1999-01-01

    Super compact, 3W power, 1060 nm polarization maintaining, diode-pumped ytterbium fiber amplifier with extinction ratio greater than 17 dB and wall-plug efficiency greater than 14% have been developed. Performance of the device fits requirements of free-space and satellite optical communications applications.

  8. Application of Amplified Femtosecond Ytterbium Fiber Laser for the THz Time-Domain Spectroscopy

    Microsoft Academic Search

    A. V. Balakin; M. M. Nazarov; O. G. Okhotnikov; I. A. Ozheredov; D. A. Sapozhnikov; A. P. Shkurinov

    2006-01-01

    We report the application of a newly developed femtosecond fiber laser for the THz time-domain spectroscopy. Ytterbium doped fiber was used for generation of laser pulses at wavelength 1.06 mum with the further amplification. The use of novel SESAM (semiconductor saturable absorber mirror) device made it possible to get pulse duration less than 200 fs on the 3 average power

  9. Direct demonstration of sensitization at 980nm optical excitation in erbium-ytterbium silicates

    E-print Network

    Vanhoutte, Michiel

    Sensitization of erbium by ytterbium in Er[subscript x]Yb[subscript 2-x]SiO[subscript 5] thin films at 980nm optical excitation is demonstrated by means of comparison of the 1.54?m photoluminescence intensities excited ...

  10. Role of Aluminum in Ytterbium–Erbium Codoped Phosphoaluminosilicate Optical Fibers

    Microsoft Academic Search

    G. G. Vienne; W. S. Brocklesby; R. S. Brown; Z. J. Chen; J. D. Minelly; J. E. Roman; D. N. Payne

    1996-01-01

    We report on a series of ytterbium–erbium codoped aluminophosphosilicate fibres fabricated by the modified chemical vapor deposition and solution doping technique where the concentration of aluminum is gradually increased in the region [A1]<[P]. We observe from deflection measurements that with increasing aluminum content the refractive index decreases and the phase separation increases. Laser slope efficiencies decrease when the aluminum concentration

  11. Residual stresses and phase transformations in Ytterbium silicate environmental barrier coatings

    NASA Astrophysics Data System (ADS)

    Stolzenburg, Fabian

    Due to their high melting temperature, low density, and good thermomechanical stability, silicon-based ceramics (SiC, Si3N4) are some of the most promising materials systems for high temperature structural applications in gas turbine engines. However, their silica surface layer reacts with water vapor contained in combustion environments. The resulting hydroxide layer volatilizes, leading to component recession. Environmental barrier coatings (EBCs) have been developed to shield the substrate from degradation. Next generation coatings for silicon-based ceramics based on ytterbium silicates have shown a promising combination of very low and good thermomechanical properties. The focus of this thesis is threefold: In the first part, phase transformations in plasma sprayed ytterbium silicates were investigated. Plasma sprayed materials are known to contain large amounts of amorphous material. Phase changes during the conversion from amorphous to crystalline materials were investigated as they have been known to lead to failure in many coatings. The second part of this work focused on measuring residual stresses in multilayer EBCs using synchrotron X-ray diffraction (XRD). Strains were resolved spatially, with probe sizes as small as 20 um. Stresses were calculated using mechanical properties of ytterbium silicates, determined with in-situ loading and heating experiments. In-situ and ex-situ heating experiments allowed for the study of changes in stress states that occur in these EBC materials during heating and cooling cycles. Lastly, the interaction of ytterbium silicates with low-melting environmental calcium-magnesium-aluminosilicate (CMAS) glasses was studied. Synchrotron XRD was used to study the influence of CMAS on the stress state in the coating, X-ray computed tomography was used to provide 3D images of coatings, and EDS and TEM analysis were used to study the interactions at the CMAS/ytterbium silicate interface in detail.

  12. Tunable single-longitudinal-mode Ytterbium all fiber laser with saturable-absorber-based auto-tracking filter

    NASA Astrophysics Data System (ADS)

    Yin, Feifei; Yang, Sigang; Chen, Hongwei; Chen, Minghua; Xie, Shizhong

    2012-05-01

    A broadband tunable, single-longitudinal-mode (SLM) Ytterbium fiber laser with unpumped Ytterbium-doped Sagnac loop is proposed and demonstrated experimentally. The unpumped Ytterbium-doped Sagnac loop is employed as a saturable absorber based auto-tracking filter to ensure single-longitudinal-mode oscillation. And a tunable band pass optical filter with large tuning range is applied to achieve broadband tuning ability. With 1-m Ytterbium-doped fiber as the gain medium, the SLM operation is achieved with over 60-nm wavelength tuning range at 160-mW pump power. The laser is very stable with output power of about 3 dBm and optical signal to noise ratio of higher than 50 dB in all the 60-nm tuning range.

  13. Comparisons of multi-wavelength oscillations using Sagnac loop mirror and Mach-Zehnder interferometer for ytterbium doped fiber lasers

    Microsoft Academic Search

    M. R. A. Moghaddam; S. W. Harun; S. Shahi; K. S. Lim; H. Ahmad

    2010-01-01

    A multiwavelength Ytterbium-doped fiber ring laser operating at 1030 nm region is demonstrated using a Sagnac loop mirror\\u000a and a Mach-Zehnder interferometer. We report the Performance comparisons of multi-wavelength oscillations in Yb3+ doped fiber lasers (YDFL) with typical commercial ytterbium doped silica fibers. By adjusting the polarization controller\\u000a (PC), a widely tunable laser range of 22 nm from 1030 nm

  14. Comparisons of multi-wavelength oscillations using Sagnac loop mirror and Mach-Zehnder interferometer for ytterbium doped fiber lasers

    Microsoft Academic Search

    M. R. A. Moghaddam; S. W. Harun; S. Shahi; K. S. Lim; H. Ahmad

    2010-01-01

    A multiwavelength Ytterbium-doped fiber ring laser operating at 1030 nm region is demonstrated using a Sagnac loop mirror and a Mach-Zehnder interferometer. We report the Performance comparisons of multi-wavelength oscillations in Yb3+ doped fiber lasers (YDFL) with typical commercial ytterbium doped silica fibers. By adjusting the polarization controller (PC), a widely tunable laser range of 22 nm from 1030 nm

  15. 49 CFR 572.175 - Upper and lower torso assemblies and torso flexion test procedure.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Upper and lower torso assemblies and torso flexion test procedure. 572.175 Section 572.175...TRANSPORTATION (CONTINUED) ANTHROPOMORPHIC TEST DEVICES Hybrid III 10-Year-Old Child Test Dummy (HIII-10C) § 572.175...

  16. 5 CFR 175.102 - Requests for the declassification of documents.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... Requests for the declassification of documents. 175.102 Section 175.102 ...OPM MANDATORY REVIEW OF CLASSIFIED DOCUMENTS § 175.102 Requests for the declassification of documents. Any Federal agency,...

  17. 5 CFR 175.102 - Requests for the declassification of documents.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... Requests for the declassification of documents. 175.102 Section 175.102 ...OPM MANDATORY REVIEW OF CLASSIFIED DOCUMENTS § 175.102 Requests for the declassification of documents. Any Federal agency,...

  18. 5 CFR 175.102 - Requests for the declassification of documents.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... Requests for the declassification of documents. 175.102 Section 175.102 ...OPM MANDATORY REVIEW OF CLASSIFIED DOCUMENTS § 175.102 Requests for the declassification of documents. Any Federal agency,...

  19. 5 CFR 175.102 - Requests for the declassification of documents.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... Requests for the declassification of documents. 175.102 Section 175.102 ...OPM MANDATORY REVIEW OF CLASSIFIED DOCUMENTS § 175.102 Requests for the declassification of documents. Any Federal agency,...

  20. 7 CFR 28.175 - Administrative and general.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...COMMODITY STANDARDS AND STANDARD CONTAINER REGULATIONS COTTON CLASSING, TESTING, AND STANDARDS Classification for Foreign Growth Cotton § 28.175 Administrative and general. Insofar as applicable, and not inconsistent with this subpart,...

  1. 7 CFR 28.175 - Administrative and general.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...COMMODITY STANDARDS AND STANDARD CONTAINER REGULATIONS COTTON CLASSING, TESTING, AND STANDARDS Classification for Foreign Growth Cotton § 28.175 Administrative and general. Insofar as applicable, and not inconsistent with this subpart,...

  2. 7 CFR 28.175 - Administrative and general.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...COMMODITY STANDARDS AND STANDARD CONTAINER REGULATIONS COTTON CLASSING, TESTING, AND STANDARDS Classification for Foreign Growth Cotton § 28.175 Administrative and general. Insofar as applicable, and not inconsistent with this subpart,...

  3. 7 CFR 28.175 - Administrative and general.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...COMMODITY STANDARDS AND STANDARD CONTAINER REGULATIONS COTTON CLASSING, TESTING, AND STANDARDS Classification for Foreign Growth Cotton § 28.175 Administrative and general. Insofar as applicable, and not inconsistent with this subpart,...

  4. 7 CFR 28.175 - Administrative and general.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...COMMODITY STANDARDS AND STANDARD CONTAINER REGULATIONS COTTON CLASSING, TESTING, AND STANDARDS Classification for Foreign Growth Cotton § 28.175 Administrative and general. Insofar as applicable, and not inconsistent with this subpart,...

  5. 40 CFR 180.175 - Maleic hydrazide; tolerances for residues.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Tolerances § 180.175 Maleic hydrazide; tolerances for residues. (a) General. (1) Tolerances for residues of the herbicide and plant regulator maleic hydrazide (1,2-dihydro-3,6-pyridazinedione) are established in or on the...

  6. 40 CFR 180.175 - Maleic hydrazide; tolerances for residues.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Tolerances § 180.175 Maleic hydrazide; tolerances for residues. (a) General. (1) Tolerances for residues of the herbicide and plant regulator maleic hydrazide (1,2-dihydro-3,6-pyridazinedione) are established in or on the...

  7. 40 CFR 180.175 - Maleic hydrazide; tolerances for residues.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Tolerances § 180.175 Maleic hydrazide; tolerances for residues. (a) General. (1) Tolerances for residues of the herbicide and plant regulator maleic hydrazide (1,2-dihydro-3,6-pyridazinedione) are established in or on the...

  8. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...California § 1952.175 Changes to approved plans. (a) In accordance with part 1953 of this chapter, the California carcinogen program implemented on January 1, 1977, was approved by the Assistant Secretary on March 6, 1978. (b) On...

  9. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...California § 1952.175 Changes to approved plans. (a) In accordance with part 1953 of this chapter, the California carcinogen program implemented on January 1, 1977, was approved by the Assistant Secretary on March 6, 1978. (b) On...

  10. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...California § 1952.175 Changes to approved plans. (a) In accordance with part 1953 of this chapter, the California carcinogen program implemented on January 1, 1977, was approved by the Assistant Secretary on March 6, 1978. (b) On...

  11. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...California § 1952.175 Changes to approved plans. (a) In accordance with part 1953 of this chapter, the California carcinogen program implemented on January 1, 1977, was approved by the Assistant Secretary on March 6, 1978. (b) On...

  12. 40 CFR 98.175 - Procedures for estimating missing data.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Iron and Steel Production § 98.175...Petroleum Refineries) of this part for flares burning coke oven gas or blast furnace gas. You must document and keep records of the...

  13. 40 CFR 98.175 - Procedures for estimating missing data.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Iron and Steel Production § 98.175...Petroleum Refineries) of this part for flares burning coke oven gas or blast furnace gas. You must document and keep records of the...

  14. 40 CFR 98.175 - Procedures for estimating missing data.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Iron and Steel Production § 98.175...Petroleum Refineries) of this part for flares burning coke oven gas or blast furnace gas. You must document and keep records of the...

  15. 40 CFR 98.175 - Procedures for estimating missing data.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Iron and Steel Production § 98.175...Petroleum Refineries) of this part for flares burning coke oven gas or blast furnace gas. You must document and keep records of the...

  16. 7 CFR 1427.175 - Liability of the producer.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...OPERATIONS COTTON Recourse Seed Cotton Loans § 1427.175 Liability...plus interest. In addition, seed cotton pledged as collateral for such...producer's claimed share in the seed cotton pledged as collateral for...

  17. 7 CFR 1427.175 - Liability of the producer.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...OPERATIONS COTTON Recourse Seed Cotton Loans § 1427.175 Liability...plus interest. In addition, seed cotton pledged as collateral for such...producer's claimed share in the seed cotton pledged as collateral for...

  18. 7 CFR 1427.175 - Liability of the producer.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...OPERATIONS COTTON Recourse Seed Cotton Loans § 1427.175 Liability...plus interest. In addition, seed cotton pledged as collateral for such...producer's claimed share in the seed cotton pledged as collateral for...

  19. 7 CFR 1427.175 - Liability of the producer.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...OPERATIONS COTTON Recourse Seed Cotton Loans § 1427.175 Liability...plus interest. In addition, seed cotton pledged as collateral for such...producer's claimed share in the seed cotton pledged as collateral for...

  20. 7 CFR 1427.175 - Liability of the producer.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...OPERATIONS COTTON Recourse Seed Cotton Loans § 1427.175 Liability...plus interest. In addition, seed cotton pledged as collateral for such...producer's claimed share in the seed cotton pledged as collateral for...

  1. Facility No. 175, elevation of southeast side from the airfield, ...

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

    Facility No. 175, elevation of southeast side from the airfield, corner of Facility No. 176 is to the left - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  2. Facility No. 175, interior detail showing rolling doors, trusses, and ...

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

    Facility No. 175, interior detail showing rolling doors, trusses, and angled monitor roof - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  3. Facility No. 175, interior of office space on second floor ...

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

    Facility No. 175, interior of office space on second floor of northwest side - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  4. Facility No. 175, exterior oblique view of northeast and northwest ...

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

    Facility No. 175, exterior oblique view of northeast and northwest sides, corner of Facility No. 176 is in background - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  5. Facility No. 175, interior overview from secondfloor corridor on northwest ...

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

    Facility No. 175, interior overview from second-floor corridor on northwest side - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  6. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Lightweight Displacement and Centers of Gravity § 170.175 Stability test: General...its vertical and longitudinal centers of gravity and its lightweight displacement...position of the vessel's vertical center of gravity is not necessary to ensure that the...

  7. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Lightweight Displacement and Centers of Gravity § 170.175 Stability test: General...its vertical and longitudinal centers of gravity and its lightweight displacement. ...position of the vessel's vertical center of gravity is not necessary to ensure that the...

  8. View of 175 ton hoisthouse from northeast. Hoist operator's cab ...

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

    View of 175 ton hoist-house from northeast. Hoist operator's cab is in foreground center. - Marshall Space Flight Center, Saturn V Dynamic Test Facility, East Test Area, Huntsville, Madison County, AL

  9. Interior view of 175 ton hoist house looking at the ...

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

    Interior view of 175 ton hoist house looking at the exterior casing for the wire rope spools. - Marshall Space Flight Center, Saturn V Dynamic Test Facility, East Test Area, Huntsville, Madison County, AL

  10. 30 CFR 62.175 - Notification of results; reporting requirements.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...UNIFORM MINE HEALTH REGULATIONS OCCUPATIONAL NOISE EXPOSURE § 62.175 Notification...report such loss to MSHA as a noise-induced hearing loss in...work-related nor aggravated by occupational noise...

  11. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Lightweight Displacement and Centers of Gravity § 170.175 Stability test: General...its vertical and longitudinal centers of gravity and its lightweight displacement. ...position of the vessel's vertical center of gravity is not necessary to ensure that the...

  12. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Lightweight Displacement and Centers of Gravity § 170.175 Stability test: General...its vertical and longitudinal centers of gravity and its lightweight displacement. ...position of the vessel's vertical center of gravity is not necessary to ensure that the...

  13. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Lightweight Displacement and Centers of Gravity § 170.175 Stability test: General...its vertical and longitudinal centers of gravity and its lightweight displacement. ...position of the vessel's vertical center of gravity is not necessary to ensure that the...

  14. 30 CFR 62.175 - Notification of results; reporting requirements.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...UNIFORM MINE HEALTH REGULATIONS OCCUPATIONAL NOISE EXPOSURE § 62.175 Notification...report such loss to MSHA as a noise-induced hearing loss in...work-related nor aggravated by occupational noise...

  15. 30 CFR 62.175 - Notification of results; reporting requirements.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...UNIFORM MINE HEALTH REGULATIONS OCCUPATIONAL NOISE EXPOSURE § 62.175 Notification...report such loss to MSHA as a noise-induced hearing loss in...work-related nor aggravated by occupational noise...

  16. 30 CFR 62.175 - Notification of results; reporting requirements.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...UNIFORM MINE HEALTH REGULATIONS OCCUPATIONAL NOISE EXPOSURE § 62.175 Notification...report such loss to MSHA as a noise-induced hearing loss in...work-related nor aggravated by occupational noise...

  17. 30 CFR 62.175 - Notification of results; reporting requirements.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...UNIFORM MINE HEALTH REGULATIONS OCCUPATIONAL NOISE EXPOSURE § 62.175 Notification...report such loss to MSHA as a noise-induced hearing loss in...work-related nor aggravated by occupational noise...

  18. Anomalous Microwave Emission from the H II Region RCW175

    Microsoft Academic Search

    C. Dickinson; R. D. Davies; J. R. Allison; J. R. Bond; S. Casassus; K. Cleary; R. J. Davis; M. E. Jones; B. S. Mason; S. T. Myers; T. J. Pearson; A. C. S. Readhead; J. L. Sievers; A. C. Taylor; M. Todorovic; G. J. White; P. N. Wilkinson

    2009-01-01

    We present evidence for anomalous microwave emission in the RCW175 H II region. Motivated by 33 GHz 13' resolution data from the Very Small Array (VSA), we observed RCW175 at 31 GHz with the Cosmic Background Imager (CBI) at a resolution of 4'. The region consists of two distinct components, G29.0-0.6 and G29.1-0.7, which are detected at high signal-to-noise ratio.

  19. Interplay between photo- and radiation-induced darkening in ytterbium-doped fibers.

    PubMed

    Duchez, Jean-Bernard; Mady, Franck; Mebrouk, Yasmine; Ollier, Nadège; Benabdesselam, Mourad

    2014-10-15

    This Letter demonstrates a remarkable interplay between photo- and radiation-induced darkening of ytterbium-doped alumino-silica optical fibers operated in amplifying conditions and harsh environments (as, e.g., in space-based applications). Influences of the pump power, ionizing dose, and dose rate on this interaction are characterized. The pump is capable of accelerating or slowing down the radiation-induced darkening build-up depending on the ionizing dose. The steady-state photo-radio-darkening level is independent of the dose and at least equal to the equilibrium level of pure photo-darkening. This lower limit is notably reached at low dose rates, including those encountered in space. We, therefore, argue that photo-resistant ytterbium-doped fibers will resist against a space mission, whatever the dose. PMID:25361132

  20. Self-similar low-noise femtosecond ytterbium-doped double-clad fiber laser

    Microsoft Academic Search

    B. Ortaç; A. Hideur; C. Chedot; M. Brunel; G. Martel; J. Limpert

    2006-01-01

    We report the generation of self-similar highly stable femtosecond pulses from an ytterbium-doped double-clad fiber laser. Positively chirped parabolic pulses with 6.4-ps duration and more than 3.2-nJ energy are obtained. These pulses are extra-cavity compressed to 140 fs. Radio-frequency noise measurements show that this regime of emission ensures low-noise operation with less than 0.05% amplitude fluctuations.

  1. High-power, efficient and azimuthally polarized ytterbium-doped fiber laser.

    PubMed

    Zou, Lin; Yao, Yao; Li, Jianlang

    2015-01-15

    An ytterbium-doped fiber laser was demonstrated to emit azimuthally polarized light with high laser power and efficiency, in which a birefringent yttrium vanadate (YVO(4)) crystal was used as the intracavity polarization discriminator. The laser power reached 3.94 W with a slope efficiency of ?71%. Our study proved that an efficient, high-power vector fiber laser would be realistic under the utilization of a simple and low-cost birefringent crystal as polarization discriminator. PMID:25679851

  2. Water-soluble mitochondria-specific ytterbium complex with impressive NIR emission.

    PubMed

    Zhang, Tao; Zhu, Xunjin; Cheng, Chopen C W; Kwok, Wai-Ming; Tam, Hoi-Lam; Hao, Jianhua; Kwong, Daniel W J; Wong, Wai-Kwok; Wong, Ka-Leung

    2011-12-21

    A water-soluble porphyrinato ytterbium complex linked with rhodamine B (Yb-2) showed mitochondria-specific subcellular localization and strong two-photon-induced NIR emissions (?(em) = 650 nm, porphyrinate ligand ? ? ?* transition; ?(em) = 1060 nm, Yb(III) (5)F(5/2) ? (5)F(7/2) transitions; ?(2) = 375 GM in DMSO) with an impressive Yb(III) NIR emission quantum yield (1% at ?(ex) = 340 nm; 2.5% at ?(ex) = 430 nm) in aqueous solution. PMID:22103884

  3. 400mW 1060-nm ytterbium-doped fiber DFB laser

    Microsoft Academic Search

    Christophe A. Codemard; Louise M. B. Hickey; Kuthan Yelen; Daniel B. S. Soh; Rachel Wixey; Mark Coker; Mikhail N. Zervas; Johan Nilsson

    2004-01-01

    We report for the first time, more than 400 mW of output power at 1056.1nm from a distributed feedback (DFB) fiber laser. The DFB fiber laser comprises a simple pi-phase-shifted Bragg grating written into a photosensitive ytterbium-doped fiber. The laser operates with a single longitudinal mode at a wavelength defined by the phase shift and the grating period. Without any

  4. Specific Heat of Gadolinium and Ytterbium Metals between 0.4 and 4°K

    Microsoft Academic Search

    O. V. Lounasmaa

    1963-01-01

    The heat capacities of gadolinium and ytterbium metals have been measured between 0.4 and 4°K in a He3 cryostat. For gadolinium, in qualitative agreement with earlier results, anomalous humps were observed in Cp at 1.1, 1.6, and 3.7°K. The ground state of the Gd3+ ion is 8S72 and consequently, due to zero orbital angular momentum of the 4f electrons, the

  5. Experimental Performance of a Single-Mode Ytterbium-doped Fiber Ring Laser with Intracavity Modulator

    NASA Technical Reports Server (NTRS)

    Numata, Kenji; Camp, Jordan

    2012-01-01

    We have developed a linearly polarized Ytterbium-doped fiber ring laser with a single longitudinal mode output at 1064 run. A fiber-coupled intracavity phase modulator ensured mode-hop free operation and allowed fast frequency tuning. The fiber laser was locked with high stability to an iodine-stabilized laser, showing a frequency noise suppression of a factor approx 10 (exp 5) at 1 mHz

  6. Applications of Ytterbium in organic light-emitting devices as high performance and transparent electrodes

    Microsoft Academic Search

    S. L Lai; M. Y Chan; M. K Fung; C. S Lee; L. S Hung; S. T Lee

    2002-01-01

    Potential applications of Ytterbium (Yb) in cathode system for organic optoelectronic\\/electronic devices were explored in NPB\\/Alq3 based bi-layer organic light-emitting devices (OLEDs). When a thin (14.5 nm) Yb layer capped with a thicker (200 nm) Ag layer was used as the cathode, the OLEDs show enhanced electron injection over those using the standard Mg:Ag cathode. Performance of the OLEDs with

  7. Phase stabilization of a large-mode-area ytterbium-doped fiber amplifier.

    PubMed

    Jones, D C; Stacey, C D; Scott, A M

    2007-03-01

    Measurements are reported on the open and closed-loop phase stability of a large-mode-area ytterbium-doped fiber amplifier. Phase fluctuations are characterized by a high-frequency low-amplitude jitter superimposed on a slow power-dependent drift. The amplifier may be phase locked to a precision of lambda/20 by using a low-bandwidth feedback loop. PMID:17392889

  8. Influences of ASE on the performances of Q-switched ytterbium-doped fiber lasers

    Microsoft Academic Search

    Q. Sun; Q. H. Mao; X. D. Chen; S. J. Feng; W. Q. Liu; J. W. Y. Lit

    2010-01-01

    The output characteristics of actively Q-switched ytterbium-doped fiber lasers (YDFL) are investigated in this paper. Our experimental results show that, the combined effect between the short switching time and the gain transient property of doped fiber causes the initial amplified spontaneous emission (ASE) power fluctuation, forming the multi-peak structure in the output pulse for either ring or linear cavity Q-switched

  9. Influences of ASE on the performances of Q-switched ytterbium-doped fiber lasers

    Microsoft Academic Search

    Q. Sun; Q. H. Mao; X. D. Chen; S. J. Feng; W. Q. Liu; J. W. Y. Lit

    2010-01-01

    The output characteristics of actively Q-switched ytterbium-doped fiber lasers (YDFL) are investigated in this paper. Our\\u000a experimental results show that, the combined effect between the short switching time and the gain transient property of doped\\u000a fiber causes the initial amplified spontaneous emission (ASE) power fluctuation, forming the multi-peak structure in the output\\u000a pulse for either ring or linear cavity Q-switched

  10. Henry's Law vaporization studies and thermodynamics of einsteinium-253 metal dissolved in ytterbium

    SciTech Connect

    Kleinschmidt, P.D.; Ward, J.W.; Matlack, G.M.; Haire, R.G.

    1984-07-01

    The cohesive energy of metallic einsteinium determines whether einsteinium is a trivalent or divalent metal. The enthalpy of sublimation, a measure of the cohesive energy, is calculated from the partial pressures of einsteinium over an alloy. The partial pressure of /sup 253/Es has been measured over the range 470--870 K, using combined target and mass spectrometric Knudsen effusion techniques. An alloy was prepared with einsteinium dissolved in a ytterbium solvent to produce a very dilute solution. Partial pressure measurements on the alloy were amenable to the experimental technique and a data analysis using a Henry's law treatment of the data. Vapor pressure data are combined with an estimated crystal entropy S/sup 0//sub 298/ and ..delta..C/sup 0//sub p/ for ytterbium, to produce enthalpy, entropy, and free energy functions from 298 to 1300 K. The vapor pressure of einsteinium in a dilute einsteinium--ytterbium alloy is described by the equation log P(atm) = -(6815 +- 216)/T+2.576 +- 0.337, from which we calculate for the enthalpy of sublimation of pure einsteinium ..delta..H/sup 0//sub 298/ (second law) = 31.76 kcal/mol. The value of the enthalpy of sublimation is consistent with the conclusion that Es is a divalent metal.

  11. Anomalous Microwave Emission from the HII region RCW175

    Microsoft Academic Search

    C. Dickinson; R. D. Davies; J. R. Allison; J. R. Bond; S. Casassus; K. Cleary; R. J. Davis; M. E. Jones; B. S. Mason; S. T. Myers; T. J. Pearson; A. C. S. Readhead; J. L. Sievers; A. C. Taylor; M. Todorovic; G. J. White; P. N. Wilkinson

    2008-01-01

    We present evidence for anomalous microwave emission in the RCW175 \\\\hii\\u000aregion. Motivated by 33 GHz $13\\\\arcmin$ resolution data from the Very Small\\u000aArray (VSA), we observed RCW175 at 31 GHz with the Cosmic Background Imager\\u000a(CBI) at a resolution of $4\\\\arcmin$. The region consists of two distinct\\u000acomponents, G29.0-0.6 and G29.1-0.7, which are detected at high signal-to-noise\\u000aratio. The

  12. 175. Photocopy of Photograph (original in Roger Lewis' private collection). ...

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

    175. Photocopy of Photograph (original in Roger Lewis' private collection). Photographer and date unknown. CENTER ISLAND, CRAWFORD WATER WHEEL, TWIN FALLS COUNTY, MILNER, IDAHO; LOOKING DOWNSTREAM FROM DAM SITE. - Milner Dam & Main Canal: Twin Falls Canal Company, On Snake River, 11 miles West of city of Burley, Idaho, Twin Falls, Twin Falls County, ID

  13. 175. Photocopy of measured drawing (from National Record Center, Suitland, ...

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

    175. Photocopy of measured drawing (from National Record Center, Suitland, Maryland, R.G. 121-76-301, Box 89, No. DC 0020 ZZ 362) Buell Solon, delineator 2 December 1936 DECORATIVE PAINTING DETAILS, 'DRAWING NO. 61' - U.S. Department of the Interior, Eighteenth & C Streets Northwest, Washington, District of Columbia, DC

  14. Facility No. 175, oblique view of southeast side and southwest ...

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

    Facility No. 175, oblique view of southeast side and southwest doors, corner of Facility No. 176 is on the left - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  15. Facility No. 175, oblique view of southwest doors and northwest ...

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

    Facility No. 175, oblique view of southwest doors and northwest side, corner of Facility No. 176 is on the right - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  16. Airfield setting of Facility Nos. 175 and 176, taken from ...

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

    Airfield setting of Facility Nos. 175 and 176, taken from north end of Ford Island Runway, with landplane hangars on the right - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  17. Drawing fractal plants with recursive functions ECS 175 Spring 2012

    E-print Network

    California at Davis, University of

    Drawing fractal plants with recursive functions ECS 175 Spring 2012 These notes describe a version describe fractals through a re-drawing rule. For instance, consider the rule that replaces a straight line the Koch snowflake. 1 #12;We can write this rule as a recursive function: drawBump(i) { if (i==0) { draw

  18. Springer-Verlag New York, Inc. 175 Fifth Avenue

    E-print Network

    Schlick, Tamar

    123 123 Springer-Verlag New York, Inc. 175 Fifth Avenue New York, NY 10010 Computational Methods for Macromolecular Modeling, New York, October 12-14, 2000 Tamar Schlick and Hin H. Gan, both, New York University, New York (Eds.) This special volume collects invited articles by participants of the Third

  19. Minor Program of Study Women's Studies Minor Code: 175

    E-print Network

    Thaxton, Christopher S.

    2014-2015 Minor Program of Study Women's Studies Minor Code: 175 Required hours: 15 hours Courses the minor must be at the 2000 level or higher. I. Required Women's Studies course (choose 3 hours) WS 2400 to Women's Studies II. Required Women's History course (choose 3 hours) HIS 3422 _____ (3) Women

  20. 27 CFR 25.175 - Prepayment of tax.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...TRADE BUREAU, DEPARTMENT OF THE TREASURY LIQUORS BEER Tax on Beer Prepayment of Tax § 25.175 Prepayment of tax...22, is insufficient for deferral of payment of tax on beer to be removed for consumption or sale, or if a...

  1. 27 CFR 25.175 - Prepayment of tax.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...TRADE BUREAU, DEPARTMENT OF THE TREASURY LIQUORS BEER Tax on Beer Prepayment of Tax § 25.175 Prepayment of tax...22, is insufficient for deferral of payment of tax on beer to be removed for consumption or sale, or if a...

  2. Erbium-ytterbium-yttrium compounds for light emission at 1.54microm

    NASA Astrophysics Data System (ADS)

    Vanhoutte, Michiel

    Silicon microphotonics? has emerged as the leading technology to overcome the interconnect bottleneck that limits a further increase of computation power following Moore's law. Optical interconnects between different electronic microprocessors in an electronic-photonic integrated circuit (EPIC) can provide a fast, low-loss and highbandwidth alternative to electrical interconnects, which suffer from issues such as resistive heating, RC delays and channel crosstalk at an increasing device density. A crucial device in such an electronic-photonic integrated circuit is a compact, highgain and low power optical amplifier to compensate for signal attenuation due to propagation losses and to recover signal strength after subsequent 3dB splits during fanout of the optical signal to different microprocessors. Erbium ions (Er3+) are an excellent candidate to provide amplification around .. = 1.54pm for optical telecommunications. Erbium-doped fiber amplifiers (EDFAs) have already enabled long-haul optical data. transmission through silica optical fibers, but scaling down a fiber amplifier to an on-chip erbium-doped waveguide amplifier (EDWA) brings along significant materials and device design challenges. In this thesis, erbium-ytterbium oxide (Erx Yb2-xO 3) and erbium-ytterbium-yttrium silicate (ErxYhyY 2-x-ySi2O7) compounds are investigated as novel materials systems for the development of EDWAs. The high erbium and ytterbium solubility (>1022 cm-3) and refractive index (1.71 < n < 1.92) make these materials excellent candidates for compact, low-power optical amplifiers. Erx Yb2-xO 3 and ErxYhyY2-x-ySi2O 7 thin films were deposited on SiO2 and analyzed structurally and optically. The role of ytterbium in these compounds is twofold. First, ytterbium can be used as an alternative to yttrium for dilution of the erbium concentration in order to mitigate parasitic concentration quenching effects. Second, ytterbium acts as a sensitizer for erbium during optical pumping at lambda = 980nm. Comparison of the different oxide and silicate thin films reveals that the alpha-disilicate phase is the best candidate for an EDWA gain medium pumped at lambda = 980nm. By means of rate and propagation equations, the composition of an Er xYhyY2-x-ySi2O7 gain medium was optimized for application as a 3dB EDWA. The optimal composition was found to be Er0.025Yb0.200Yb0.200Y1.775Si 2O7, which provides a 1.5dB/cm gain at only 3mW of pump power. In terms of the figure of merit 3dB gain/(device area ? pump power), this material outperforms other EDWA materials reported in literature. (Copies available exclusively from MIT Libraries, libraries.mit.edu/docs - docs mit.edu)

  3. Self-similar low-noise femtosecond ytterbium-doped double-clad fiber laser

    Microsoft Academic Search

    B. Ortac; A. Hideur; C. Chedot; M. Brunel; G. Martel; J. Limpert

    2006-01-01

    We report on the generation of self-similar highly-stable femtosecond pulses from a side-pumped ytterbium-doped double-clad fiber laser. Positively-chirped parabolic pulses with 6.4 ps duration and more than 3.2 nJ energy are obtained. These pulses are extra-cavity compressed to 140 fs. The noise measurements using radio-frequency analysis show that this regime of emission ensures low-noise operation with less than 0.05 %

  4. Observation for Singularity of Fluctuation in Ytterbium Nitrate Crystal at Low Temperatures

    NASA Astrophysics Data System (ADS)

    Isoda, Hiroshi; Kawashima, Riki

    2012-02-01

    The time series of ac conductivities at 2 kHz along the direction (represented as the c2-axis) perpendicular to the c-axis of an ytterbium nitrate crystal is measured at low temperatures above 11 K but below 50 K in both the cooling and heating processes. Bursts are observed in the time series of the conductivities. Singularities are found in the properties of the fluctuations of the conductivities near 32 K in the cooling process and near 41 K in the heating process.

  5. Divalent ytterbium ions in yttrium aluminum garnet and yttrium oxide ceramics

    NASA Astrophysics Data System (ADS)

    Solomonov, V. I.; Orlov, A. N.; Spirina, A. V.; Konev, S. F.; Cholakh, S. O.; Luk'yashin, K. E.

    2014-12-01

    Laser ceramics based on ytterbium-doped yttrium aluminum garnet and yttrium oxide are synthesized. The transmission, pulsed cathodoluminescence, and electron-spin resonance spectra of these ceramics at room temperature are measured and analyzed. It is shown that all the samples contain Yb2+ ions with the 4 f 136 s electronic configuration of the ground state, which manifest themselves in the form of relatively weak bands in the IR region of the optical spectra in addition to the bands of Yb3+ ions.

  6. Long-range Rydberg-Rydberg interactions in calcium, strontium and ytterbium

    E-print Network

    Vaillant, C L; Potvliege, R M

    2012-01-01

    Long-range dipole-dipole and quadrupole-quadrupole interactions between pairs of Rydberg atoms are calculated perturbatively for calcium, strontium and ytterbium within the Coulomb approximation. Quantum defects, obtained by fitting existing laser spectroscopic data, are provided for all $S$, $P$, $D$ and $F$ series of strontium and for the $^3P_2$ series of calcium. The results show qualitative differences with the alkali metal atoms, including isotropically attractive interactions of the strontium $^1S_0$ states and a greater rarity of F\\"orster resonances. Only two such resonances are identified, both in triplet series of strontium. The angular dependence of the long range interaction is briefly discussed.

  7. Long-range Rydberg-Rydberg interactions in calcium, strontium and ytterbium

    E-print Network

    C. L. Vaillant; M. P. A. Jones; R. M. Potvliege

    2012-05-11

    Long-range dipole-dipole and quadrupole-quadrupole interactions between pairs of Rydberg atoms are calculated perturbatively for calcium, strontium and ytterbium within the Coulomb approximation. Quantum defects, obtained by fitting existing laser spectroscopic data, are provided for all $S$, $P$, $D$ and $F$ series of strontium and for the $^3P_2$ series of calcium. The results show qualitative differences with the alkali metal atoms, including isotropically attractive interactions of the strontium $^1S_0$ states and a greater rarity of F\\"orster resonances. Only two such resonances are identified, both in triplet series of strontium. The angular dependence of the long range interaction is briefly discussed.

  8. Temperature effects of an all-fiber polarization maintaining Ytterbium optical amplifier

    NASA Astrophysics Data System (ADS)

    Sanchez, Anthony D.

    2011-09-01

    An overview of recent fiber based component developments is presented that lead to robust all-fiber lasers and optical amplifiers. Critical issues impacting the integration of high power rare earth doped optical amplifiers are presented. The optical performance of key fiber components is reported with emphasis on temperature effects of a monolithically integrated multi-Watt, single mode, Polarization Maintaining (PM), Ytterbium (Yb) doped double clad optical amplifier. Performance of an all-fiber optical amplifier design that integrates two fiber coupled laser diode pumps and one PM Yb double clad feed through fiber directly in to a combiner is reported.

  9. Optical Excitation and Decay Dynamics of Ytterbium Atoms Embedded in a Solid Neon Matrix

    SciTech Connect

    Xu, C.-Y.; Lu, Z.-T. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Department of Physics and Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States); Hu, S.-M. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Singh, J.; Bailey, K.; Mueller, P.; O'Connor, T. P. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Welp, U. [Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

    2011-08-26

    Neutral ytterbium atoms embedded in solid neon qualitatively retain the structure of free atoms. Despite the atom-solid interaction, the 6s6p {sup 3}P{sub 0} level is found to remain metastable with its lifetimes determined to be in the range of ten to hundreds of seconds. The atomic population can be almost completely transferred between the ground level and the metastable level via optical excitation and spontaneous decay. The dynamics of this process is examined and is used to explicitly demonstrate that the transition broadening mechanism is homogeneous.

  10. Single-frequency, polarized ytterbium-doped fiber MOPA source with 264 W output power

    Microsoft Academic Search

    Y. Jeong; J. Nilsson; J. K. Sahu; D. B. S. Soh; C. Alegria; P. Dupriez; C. A. Codemard; D. N. Payne; R. Harley; L. M. B. Hickey; L. Wanzcyk; C. E. Chryssou; J. Alvarez-Chavez; P. W. Turner

    2004-01-01

    A single-frequency, single-mode, plane-polarized ytterbiumdoped all-fiber master-oscillator - power amplifier source at 1060 um generated 264 W of cw output $wer (pump-power limited) The li-stage amplifier operated with a high gain of 19 dB and a high conversion efficiency of 68%. 02004 Optical Society of America OCIS codes: (140.3510) Lasea, fiber; (060.2420) Fiben, polarization-maintaining Cladding-pumped ytterbium-doped fiber sources have been

  11. Measurements of activation cross sections for 175Lu(n, ?) 172Tm, 176Lu(n, ?) 173Tm and 175Lu(n, p) 175m+gYb reactions induced by neutrons around 14 MeV

    Microsoft Academic Search

    Junhua Luo; Fei Tuo; Xiangzhong Kong

    2011-01-01

    The cross sections for the 175Lu(n,?)172Tm, 176Lu(n,?)173Tm and 175Lu(n,p)175m+gYb reactions have been measured in the neutron energy range of 13.5–14.8MeV using the activation technique. The first data for 175Lu(n,?)172Tm reaction cross sections are presented. In our experiment, the fast neutrons were produced via the 3H(d,n)4He reaction on K-400 Neutron Generator at Chinese Academy of Engineering Physics (CAEP). Induced gamma activities

  12. 1 CFR 17.5 - Criteria for emergency filing for public inspection.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Criteria for emergency filing for public inspection. 17.5...PUBLIC INSPECTION AND PUBLICATION SCHEDULES Emergency Schedule § 17.5 Criteria for emergency filing for public inspection. An...

  13. 1 CFR 17.5 - Criteria for emergency filing for public inspection.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 2012-01-01 false Criteria for emergency filing for public inspection. 17.5...PUBLIC INSPECTION AND PUBLICATION SCHEDULES Emergency Schedule § 17.5 Criteria for emergency filing for public inspection. An...

  14. 26 CFR 1.175-2 - Definition of soil and water conservation expenditures.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...false Definition of soil and water conservation expenditures. 1.175-2...175-2 Definition of soil and water conservation expenditures. (a) Expenditures...for the purpose of soil or water conservation in respect of...

  15. 26 CFR 1.175-2 - Definition of soil and water conservation expenditures.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...false Definition of soil and water conservation expenditures. 1.175-2...175-2 Definition of soil and water conservation expenditures. (a) Expenditures...for the purpose of soil or water conservation in respect of...

  16. 26 CFR 1.175-2 - Definition of soil and water conservation expenditures.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...false Definition of soil and water conservation expenditures. 1.175-2...175-2 Definition of soil and water conservation expenditures. (a) Expenditures...for the purpose of soil or water conservation in respect of...

  17. 26 CFR 1.175-2 - Definition of soil and water conservation expenditures.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...false Definition of soil and water conservation expenditures. 1.175-2...175-2 Definition of soil and water conservation expenditures. (a) Expenditures...for the purpose of soil or water conservation in respect of...

  18. 26 CFR 1.175-2 - Definition of soil and water conservation expenditures.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...false Definition of soil and water conservation expenditures. 1.175-2...175-2 Definition of soil and water conservation expenditures. (a) Expenditures...for the purpose of soil or water conservation in respect of...

  19. Temperature dependence of a high-power ytterbium-doped fiber amplifier operating at 1060 nm and 1080 nm

    Microsoft Academic Search

    L. A. Vazquez-Zuniga; S. Chung; Y. Jeong

    2009-01-01

    We investigate, experimentally and numerically, the wavelength-dependent, thermal instability of a high-power ytterbium-doped fiber amplifier operating at 1060-nm and 1080-nm, including its spectroscopic and gain properties as well as how to mitigate its thermal degradation.

  20. Ytterbium-decreasing Streptomyces sp. and its naphthoquinone-pigment production in the presence of rare-earth elements

    Microsoft Academic Search

    Manjiroh Kamijo; Tohru Suzuki; Keiichi Kawai; Toshiaki Fujii; Hironobu Murase

    1999-01-01

    We screened for oligotrophic microorganisms capable of decreasing the concentration of ytterbium (Yb), a representative of the heavy rare-earth elements, in a culture medium. From 476 strains of oligotrophic microorganisms (grown on 1100 diluted nutrient agar) isolated from soil and river water samples, 5 strains capable of reducing the concentration of Yb in diluted nutrient broth containing 5 ppm Yb

  1. RADECS 2010 Proceedings Paper LN2 1 Abstract--Radiation effects in ytterbium-doped silica optical

    E-print Network

    Boyer, Edmond

    fibers are still poorly studied despite their importance in space- based applications as optical inter Stimulated Luminescence, Ytterbium-doped silica optical fibers. I. INTRODUCTION HE radiation and procedures we present could be followed for Er-doped fibers. The performances of irradiated YDF are reduced

  2. Study of low energy Ytterbium atom-ion charge transfer collisions using a surface-electrode trap

    E-print Network

    Pruttivarasin, Thaned

    2008-01-01

    We demonstrate a new isotope-selective system to measure low energy charge transfer collisions between ytterbium ions and atoms in the range of collisional energy from 2.2x 10-5 eV to 4.3x 10-3 eV, corresponding to effective ...

  3. Note: 15-fs, 15-?J green pulses from two-stage temporal compressor of ytterbium laser pulses.

    PubMed

    Konyashchenko, A V; Kostryukov, P V; Losev, L L; Tenyakov, S Yu

    2012-10-01

    15-fs, 15-?J light pulses at the central wavelength of 515 nm were generated by two-stage nonlinear compression of 300-fs, 150-?J ytterbium laser pulses. The compression was based on the pulse spectrum broadening by self-phase modulation in gas filled capillary and second harmonic generation in crystal. PMID:23126820

  4. Some Deformation Properties of the Even-Even Ytterbium, Hafnium and Tungsten Nuclei

    NASA Astrophysics Data System (ADS)

    Doma, S. B.; El-Gendy, H. S.

    2012-09-01

    The deformation structure of the even-even ytterbium, hafnium and tungsten nuclei is investigated in framework of the collective model, the single-particle Schrödinger fluid model and the cranked Nilsson model. Accordingly, we have calculated the rotational and vibrational energies, the nuclear moments of inertia, the total ground-state energy, the quadrupole moment, the liquid drop (LD) energy, the Strutinsky inertia, the LD inertia, the volume conservation factor ? 0/? o_0, the smoothed energy, the Bardeen, Cooper and Schrieffer (BCS) energy and the G-value of the ytterbium: 170Yb, 172Yb and 174Yb, hafnium: 176Hf, 178Hf and 180Hf and tungsten: 182W, 184W and 186W nuclei as functions of the deformation parameters ?, ?, which are assumed to vary in the ranges (-0.50 ? ? ? 0.50) and (0° ? ? ? 60°). Also, two polynomials in ? are obtained to produce results in good agreement with the corresponding results for the total ground-state energy and the quadrupole moment of the mentioned nine nuclei.

  5. 21 CFR 175.350 - Vinyl acetate/crotonic acid copolymer.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2009-04-01 true Vinyl acetate/crotonic acid copolymer. 175.350 Section 175.350... § 175.350 Vinyl acetate/crotonic acid copolymer. A copolymer of vinyl acetate and crotonic acid may be safely used as a coating or...

  6. Diffusion Processes at the MnSi 1.75 ?\\/Cr Contact

    Microsoft Academic Search

    L. I. Petrova; L. D. Dudkin; M. I. Fedorov; F. Yu. Solomkin; V. K. Zaitsev; I. S. Eremin

    2004-01-01

    Diffusion processes between chromium and the higher manganese silicide MnSi1.75 in MnSi1.75?\\/Cr and MnSi1.75?\\/Cr\\/Ni contact regions are studied by microstructural analysis and x-ray microanalysis. The results demonstrate that, at elevated temperatures, the composition and sequence of layers in the diffusion zone between MnSi1.75 and Cr are consistent with the phase equilibria in the Cr–Mn–Si system. In MnSi1.75?\\/Cr\\/Ni samples, a larger

  7. Ocean Drilling Program Janus Database: Legs 174, 175 Data

    NSDL National Science Digital Library

    Data from Leg 174A (Cork Hole 395A), Leg 174B (Continuing the New Jersey Mid-Atlantic Sea-level Transect), and Leg 175 (Benguela Current) of the Ocean Drilling Program (ODP) are now available online. The Ocean Drilling Program (described in the August 5, 1998 Scout Report for Science & Engineering) conducts basic research into the "history of the ocean basins and the nature of the crust beneath the floor." ODP is funded principally by the National Science Foundation (NSF), along with large contributions from ODP's international partners.

  8. Doppler spectroscopy of an ytterbium Bose-Einstein condensate on the clock transition

    NASA Astrophysics Data System (ADS)

    Dareau, A.; Scholl, M.; Beaufils, Q.; Döring, D.; Beugnon, J.; Gerbier, F.

    2015-02-01

    We describe Doppler spectroscopy of Bose-Einstein condensates of ytterbium atoms using a narrow optical transition. We address the optical clock transition around 578 nm between the 1S0 and the 3P0 states with a laser system locked on a high-finesse cavity. We show how the absolute frequency of the cavity modes can be determined within a few tens of kilohertz using high-resolution spectroscopy on molecular iodine. We show that optical spectra reflect the velocity distribution of expanding condensates in free fall or after release inside an optical waveguide. We demonstrate subkilohertz spectral linewidths, with long-term drifts of the resonance frequency well below 1 kHz/h. These results open the way to high-resolution spectroscopy of many-body systems.

  9. Simultaneous effects of photo- and radio- darkening in ytterbium-doped aluminosilicate fibers

    SciTech Connect

    Duchez, Jean-Bernard, E-mail: jbduchez@unice.fr; Mady, Franck, E-mail: jbduchez@unice.fr; Mebrouk, Yasmine, E-mail: jbduchez@unice.fr; Benabdesselam, Mourad, E-mail: jbduchez@unice.fr [University of Nice Sophia Antipolis, Laboratoire de Physique de la Matière Condensée, CNRS UMR 7336, Parc Valrose, 06108 NICE cedex 2 (France)

    2014-10-21

    We present original characterizations of photo-radio-darkening in ytterbium-doped silica optical fibers submitted to the simultaneous action of the pump and of an ionizing radiation. We present the interplay between both radiations, showing e.g. that the pump is able to darken or bleach the fiber depending on the ionizing dose. The photo-resistance of the fiber is shown to play a crucial role on its radio-resistance, and that photo-resistant fibers should be also radio-resistant in low dose rate conditions. All the results are thoroughly explained by a physical model presented in a separate article by Mady et al. (this conference proceeding)

  10. Mode-Locked Thulium Ytterbium Co-Doped Fiber Laser with Graphene Oxide Paper Saturable Absorber

    NASA Astrophysics Data System (ADS)

    M. Azooz, S.; W. Harun, S.; H., Ahmad; Halder, A.; C. Paul, M.; Pal, M.; K. Bhadra, S.

    2015-01-01

    A mode-locked thulium ytterbium co-doped fiber laser (TYDFL) is proposed and demonstrated by using a commercial graphene oxide (GO) paper as saturable absorber (SA). The GO paper is sandwiched between two fiber ferrules and incorporates a ring laser cavity to generate soliton pulse train operating at 1942.0nm at a threshold multimode pump power as low as 1.8 W. The mode-locked TYDFL has a repetition rate of 22.32 MHz and the calculated pulse width of 1.1 ns. Even though the SA has a low damage threshold, the easy fabrication of GO paper should promote its potential application in ultrafast photonics.

  11. Study on the clock-transition spectrum of cold 171Yb ytterbium atoms

    NASA Astrophysics Data System (ADS)

    Zhang, Xiaohang; Zhou, Min; Chen, Ning; Gao, Qi; Han, Chengyin; Yao, Yuan; Xu, Peng; Li, Shangyan; Xu, Yilin; Jiang, Yanyi; Bi, Zhiyi; Ma, Longsheng; Xu, Xinye

    2015-02-01

    We present a detailed study of the clock-transition spectrum of cold 171Yb ytterbium atoms in a 1D optical lattice. A typical clock-transition spectrum with a carrier-sideband structure is observed. After minimizing the power broadening effect and compensating the stray magnetic field, the carrier linewidth is narrowed to about 16?Hz for a 60?ms interrogation time. By increasing the interrogation time to 150?ms, the linewidth is further reduced to 6.8?Hz. By applying the bias magnetic field parallel to the clock-laser polarization, a two-peak spectrum corresponding to two ? transitions is obtained. Finally, spin polarization of atoms to a single desired Zeeman sublevel of the ground state is also demonstrated. The presented results will be very useful for developing better optical lattice clocks.

  12. Bis(pentamethylcyclopentadienyl)ytterbium: An investigation of weak interactions in solution using multinuclear NMR spectroscopy

    SciTech Connect

    Schwartz, D.J.

    1995-07-01

    NMR spectroscopy is ideal for studying weak interactions (formation enthalpy {le}20 kcal/mol) in solution. The metallocene bis(pentamethylcyclopentadienyl)ytterbium, Cp*{sub 2}Yb, is ideal for this purpose. cis-P{sub 2}PtH{sub 2}complexes (P = phosphine) were used to produce slow-exchange Cp*{sub 2}YbL adducts for NMR study. Reversible formation of (P{sub 2}PtH){sub 2} complexes from cis-P{sub 2}PtH{sub 2} complexes were also studied, followed by interactions of Cp*{sub 2}Yb with phosphines, R{sub 3}PX complexes. A NMR study was done on the interactions of Cp*{sub 2}Yb with H{sub 2}, CH{sub 4}, Xe, CO, silanes, stannanes, C{sub 6}H{sub 6}, and toluene.

  13. Applications of Ytterbium in organic light-emitting devices as high performance and transparent electrodes

    NASA Astrophysics Data System (ADS)

    Lai, S. L.; Chan, M. Y.; Fung, M. K.; Lee, C. S.; Hung, L. S.; Lee, S. T.

    2002-11-01

    Potential applications of Ytterbium (Yb) in cathode system for organic optoelectronic/electronic devices were explored in NPB/Alq 3 based bi-layer organic light-emitting devices (OLEDs). When a thin (14.5 nm) Yb layer capped with a thicker (200 nm) Ag layer was used as the cathode, the OLEDs show enhanced electron injection over those using the standard Mg:Ag cathode. Performance of the OLEDs with the Yb/Ag cathode is comparable to that using LiF/Al cathode. Interestingly, we also found that Yb can also be used to prepare a highly transparent cathode by co-evaporating Yb and Ag to form a Yb:Ag alloy electrode. Surface-emitting (or top emission) and transparent (emission from both surfaces) OLEDs with low turn-on voltage (3.75 V) and high efficiency were prepared with the Yb:Ag electrode.

  14. Electronic Structure of Ytterbium-Doped Strontium Fluoroapatite: Photoemission and Photoabsorption Investigation

    SciTech Connect

    Nelson, Art J.(LLNL) [LLNL; Van Buuren, Tony W.(LLNL) [LLNL; Bostedt, C (Lawrence Livermore National Laboratory) [Lawrence Livermore National Laboratory; Schaffers, K I.(Lawrence Livermore National Laboratory) [Lawrence Livermore National Laboratory; Terminello, L J.(Lawrence Livermore National Laboratory) [Lawrence Livermore National Laboratory; Engelhard, Mark H.(BATTELLE (PACIFIC NW LAB)) [BATTELLE (PACIFIC NW LAB); Baer, Donald R.(BATTELLE (PACIFIC NW LAB)) [BATTELLE (PACIFIC NW LAB)

    2002-04-15

    X-ray photoemission and x-ray photoabsorption were used to study the composition and the electronic structure of ytterbium-doped strontium fluoroapatite (Yb:S-FAP). High resolution photoemission measurements on the valence band electronic structure and Sr 3d, P 2p and 2s, Yb 4d and 4p, F 1s and O 1s core lines were used to evaluate the surface and near surface chemistry of this fluoroapatite. Element specific density of unoccupied electronic states in Yb:S-FAP were probed by x-ray absorption spectroscopy (XAS) at the Yb 4d (N4,5-edge), Sr 3d (M4,5-edge), P 2p (L2,3-edge), F 1s and O 1s (K-edges) absorption edges. These results provide the first measurements of the electronic structure and surface chemistry of this material.

  15. All-normal-dispersion passive harmonic mode-locking 220??fs ytterbium fiber laser.

    PubMed

    Wang, Junli; Bu, Xiangbao; Wang, Rui; Zhang, Long; Zhu, Jiangfeng; Teng, Hao; Han, Hainian; Wei, Zhiyi

    2014-08-10

    We report a stable passive second-harmonic mode-locked all-normal-dispersion ytterbium fiber laser based on nonlinear polarization evolution. This fiber laser has two polarization beam splitter output ports for optimizing the output spectrum 5 ps duration pulses with 187 mW average power being generated at the harmonic repetition rate of 99.6 MHz. By use of a pair of gratings to extracavity compensate the chirp, the pulse is further compressed to 220 fs. We measured that the peak-to-pedestal extinction of the radio frequency is about 80 dB corresponding to a pulse-to-pulse energy fluctuation of 0.32% and timing jitter of 3.2 ps. PMID:25320915

  16. Injection locking of a high power ultraviolet laser diode for laser cooling of ytterbium atoms

    E-print Network

    Toshiyuki Hosoya; Martin Miranda; Ryotaro Inoue; Mikio Kozuma

    2014-12-02

    We developed a high-power laser system at a wavelength of 399 nm for laser cooling of ytterbium atoms with ultraviolet laser diodes. The system is composed of an external cavity laser diode providing frequency stabilized output at a power of 40 mW and another laser diode for amplifying the laser power up to 220 mW by injection locking. The systematic method for optimization of our injection locking can also be applied to high power light sources at any other wavelengths. Our system, which does not depend on complex nonlinear frequency-doubling, has great importance for implementing transportable optical lattice clocks, and is also useful for investigations on condensed matter physics or quantum information processing using cold atoms.

  17. ATOMIC AND MOLECULAR PHYSICS: Realization of Green MOT for Ytterbium Atoms

    NASA Astrophysics Data System (ADS)

    Zhao, Peng-Yii; Xiong, Zhuan-Xian; Long, Yun; He, Ling-Xiang; Lü, Bao-Long

    2009-08-01

    We report the experimental realization of a magneto-optical trap (MOT) of 174Yb atoms operating on the 1So-3 P1 intercombination transition at 555.8 nm. The green MOT is loaded by a Zeeman-slowed atomic beam. In order to increase the capture velocity of the MOT, we use the trapping laser beams consisting of five discrete frequency components obtained by modulating the laser light through an electro-optic modulator. The trapped atomic number of the 174Yb isotope is about 6.2 × 105, and the temperature of the cold atomic cloud is estimated to be about 100 ?K. The success of the green MOT is an important step towards the goal of an ytterbium optical clock.

  18. Frequency agile, electronically tunable, high-power Ytterbium-doped PM LMA fiber laser

    NASA Astrophysics Data System (ADS)

    Ding, Jianwu; Huang, Ye; Geiger, Allen; Richmond, Richard

    2007-02-01

    We report on an electronically tunable continuous-wave (CW) Ytterbium doped polarization maintaining fiber laser with more than 100 nm tuning range and more than 10 W linearly polarized single spatial mode laser output. The laser can be continuously tuned from 1027 nm to 1103 nm without any parasitic lasing peak with the 10dB linewidth of 0.1 nm. The maximum achievable tuning range of the fiber laser was from 1025 nm to 1124 nm with companying parasitic lasing peaks around 1040 nm. The usage of an intra-cavity acousto-optic tunable filter allows for the fast electronic tunability with less than 50 ?s response time and random wavelength access capability.

  19. Nonlinear dynamics of Ytterbium-doped fiber laser Q-switched using acousto-optical modulator

    NASA Astrophysics Data System (ADS)

    Barmenkov, Y. O.; Kir'yanov, A. V.; Andres, M. V.

    2014-12-01

    A comprehensive experimental analysis of the dynamics of an ytterbium-doped fiber laser actively Q-switched (QS) using an intracavity acousto-optical modulator (AOM) is presented. It is shown that type of QS pulsing strongly depends on AOM repetition rate and pump power. In particular, at low repetition rates, including zero-rate, and at relatively high pump powers peculiar QS pulsing, switched by stimulated Brillouin scattering (SBS), is established in the laser. The cause of such kind of pulsing is the SBS-process boosted by spurious narrow-line CW lasing that arises in auxiliary low-Q cavity formed by an output coupler (in our experiments - fiber Bragg gratings) and weak reflections from blocked AOM. The parameters' area where this regime occurs is limited by certain values of pump power and AOM repetition rate. At increasing AOM repetition rate or decreasing pump power spurious CW lasing is not attained in the system; consequently, the SBS type of QS fades, while "conventional" QS (CQS) lasing is established in the system and remains. However CQS pulsing strongly suffers the nonlinear-dynamics effects: depending on AOM repetition rate and pump power the laser switches to common P1, P2, or P3 attractors, when QS pulses arise at sub-harmonics of AOM repetition rate, or to the specific transient regimes between them, or to chaotic operation. These and other sides (e.g. pulse jittering) of operation of the QS ytterbium-doped fiber laser with AOM are under scope of the present review as they have big interest for practical applications.

  20. Anomalous Microwave Emission from the HII region RCW175

    E-print Network

    C. Dickinson; R. D. Davies; J. R. Allison; J. R. Bond; S. Casassus; K. Cleary; R. J. Davis; M. E. Jones; B. S. Mason; S. T. Myers; T. J. Pearson; A. C. S. Readhead; J. L. Sievers; A. C. Taylor; M. Todorovic; G. J. White; P. N. Wilkinson

    2008-07-25

    We present evidence for anomalous microwave emission in the RCW175 \\hii region. Motivated by 33 GHz $13\\arcmin$ resolution data from the Very Small Array (VSA), we observed RCW175 at 31 GHz with the Cosmic Background Imager (CBI) at a resolution of $4\\arcmin$. The region consists of two distinct components, G29.0-0.6 and G29.1-0.7, which are detected at high signal-to-noise ratio. The integrated flux density is $5.97\\pm0.30$ Jy at 31 GHz, in good agreement with the VSA. The 31 GHz flux density is $3.28\\pm0.38$ Jy ($8.6\\sigma$) above the expected value from optically thin free-free emission based on lower frequency radio data and thermal dust constrained by IRAS and WMAP data. Conventional emission mechanisms such as optically thick emission from ultracompact \\hii regions cannot easily account for this excess. We interpret the excess as evidence for electric dipole emission from small spinning dust grains, which does provide an adequate fit to the data.

  1. Creation of quantum-degenerate gases of ytterbium in a compact 2D-/3D-magneto-optical trap setup

    SciTech Connect

    Doerscher, Soeren; Thobe, Alexander; Hundt, Bastian; Kochanke, Andre; Le Targat, Rodolphe; Windpassinger, Patrick; Becker, Christoph; Sengstock, Klaus [Institut fuer Laserphysik, Zentrum fuer Optische Quantentechnologien, Universitaet Hamburg, Hamburg 22761 (Germany)

    2013-04-15

    We report on the first experimental setup based on a 2D-/3D-magneto-optical trap (MOT) scheme to create both Bose-Einstein condensates and degenerate Fermi gases of several ytterbium isotopes. Our setup does not require a Zeeman slower and offers the flexibility to simultaneously produce ultracold samples of other atomic species. Furthermore, the extraordinary optical access favors future experiments in optical lattices. A 2D-MOT on the strong {sup 1}S{sub 0}{yields}{sup 1}P{sub 1} transition captures ytterbium directly from a dispenser of atoms and loads a 3D-MOT on the narrow {sup 1}S{sub 0}{yields}{sup 3}P{sub 1} intercombination transition. Subsequently, atoms are transferred to a crossed optical dipole trap and cooled evaporatively to quantum degeneracy.

  2. Comparison of high–dose rate prostate brachytherapy dose distributions with iridium-192, ytterbium-169, and thulium-170 sources

    Microsoft Academic Search

    Devan Krishnamurthy; Vivian Weinberg; J. Adam M. Cunha; I-Chow Hsu; Jean Pouliot

    2011-01-01

    PurposeRecent studies have identified that among different available radionuclides, the dose characteristics and shielding properties of ytterbium-169 (169Yb) and thulium-170 (170Tm) may suit high–dose rate (HDR) brachytherapy needs. The purpose of this work was to compare clinically optimized dose distributions using proposed 169Yb and 170Tm HDR sources with the clinical dose distribution from a standard microSelectron V2 HDR iridium-192 (192Ir)

  3. Triethylenetetramine penta- and hexa-acetamide ligands and their ytterbium complexes as paraCEST contrast agents for MRI.

    PubMed

    Burdinski, Dirk; Lub, Johan; Pikkemaat, Jeroen A; Moreno Jalón, Diana; Martial, Sophie; Del Pozo Ochoa, Carolina

    2008-08-21

    The ligand triethylenetetramine-N,N,N',N'',N''',N'''-hexaacetamide (ttham) was synthesized with the aim of forming lanthanide complexes suitable as contrast agents for magnetic resonance imaging applications utilizing the chemical exchange-dependent saturation transfer (CEST) effect. It was designed to exclude water molecules from the first coordination sphere and provide a high number of CEST active amide protons per lanthanide ion. The ligand was characterized by its protonation behavior and its complexation properties with ytterbium ions in aqueous solution. The basicity of the ttham backbone amine protons decreases in the order N(central(1)) > N(terminal(1)) > N(terminal(2)) > N(central(2)), as deduced from NMR titration experiments and from a comparison of its protonation constants with those of two ttham derivatives, in which either a terminal (N-benzyl-triethylenetetramine-N,N',N'',N''',N'''-pentaacetamide, 1bttpam) or a central acetamide group (N'-benzyl-triethylenetetramine-N,N,N'',N''',N'''-pentaacetamide, 4bttpam) is substituted with a benzyl group. This protonation sequence results from the combined influence of inductive effects, the intramolecular hydrogen bonding network, and the Coulomb repulsion between protonated ammonium groups. The ytterbium complex of ttham, [Yb(ttham)]Cl(3), is coordinatively frustrated. Due to steric constraints, in addition to the four backbone nitrogen atoms, only three of the four symmetry-equivalent terminal acetamide donors can coordinate simultaneously to the ytterbium ion, and the dangling fourth one exchanges quickly with the other three. The ytterbium complexes of a total of five ligands (ttham, 1bttpam, 4bttpam, 2,2',2''-triaminotriethylaminehexaacetamide (ttaham), and diethylenetriamine-N,N,N',N'',N''-pentaacetamide (dtpam)) were studied with respect to their CEST properties. In solution, all of these complexes have a low symmetry. The presence of multiple magnetically different amide groups in each complex prevents the realization of very high CEST effects. These results nevertheless form an excellent basis for a further optimization of this class of ligands. PMID:18688432

  4. Investigation of the vapour-plasma plume in the welding of titanium by high-power ytterbium fibre laser radiation

    NASA Astrophysics Data System (ADS)

    Bykovskiy, D. P.; Petrovskii, V. N.; Uspenskiy, S. A.

    2015-03-01

    The vapour-plasma plume produced in the welding of 6-mm thick VT-23 titanium alloy plates by ytterbium fibre laser radiation of up to 10 kW power is studied in the protective Ar gas medium. High-speed video filming of the vapour-plasma plume is used to visualise the processes occurring during laser welding. The coefficient of inverse bremsstrahlung by the welding plasma plume is calculated from the data of the spectrometric study.

  5. KNb1.75V0.25PS10

    PubMed Central

    Yu, Jaemin; Yun, Hoseop

    2011-01-01

    The title compound, potassium diniobium vanadium phospho­rus deca­sulfide, KNb1.75V0.25PS10, was obtained by reaction of the elements with a eutectic mixture of KCl/LiCl. It is isostructural with the quaternary KNb2PS10, but the Nb sites are occupied by statistically disordered Nb (87.5%) and V (12.5%) atoms. The structure is composed of anionic ? 1[M 2PS10]? chains (M = Nb/V) separated from each other by K+ ions. The chain is composed of [MS8] distorted bicapped trigonal prisms and [PS4] tetra­hedra. There are no inter­chain bonding inter­actions. The crystal used for the X-ray analysis was a racemic twin. PMID:21522232

  6. Molecular & Biochemical Parasitology 175 (2011) 2129 Contents lists available at ScienceDirect

    E-print Network

    Gelb, Michael

    2011-01-01

    Molecular & Biochemical Parasitology 175 (2011) 21­29 Contents lists available at ScienceDirect Molecular & Biochemical Parasitology Identification of inhibitors for putative malaria drug targets among

  7. 49 CFR 175.25 - Notification at air passenger facilities of hazardous materials restrictions.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...air passenger facilities of hazardous materials restrictions. 175.25 Section...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY...

  8. 49 CFR 175.25 - Notification at air passenger facilities of hazardous materials restrictions.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...air passenger facilities of hazardous materials restrictions. 175.25 Section...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY...

  9. 49 CFR 175.25 - Notification at air passenger facilities of hazardous materials restrictions.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...air passenger facilities of hazardous materials restrictions. 175.25 Section...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY...

  10. Development of trivalent ytterbium doped fluorapatites for diode-pumped laser applications

    NASA Astrophysics Data System (ADS)

    Bayramian, Andrew James

    2000-11-01

    A major motivator of this work is the Mercury Project, a one kilowatt diode-pumped solid-state laser system under development at Lawrence Livermore National Laboratory (LLNL), which incorporates ytterbium doped strontium fluorapatite, Sr5(PO4)3F (S-FAP), as the amplifier gain medium. The primary focus of this thesis is a full understanding of the properties of this material, which is necessary for proper design and modeling of the system. Ytterbium-doped fluorapatites were investigated at LLNL prior to this work and found to be ideal candidate materials for high-power amplifier systems providing high absorption and emission cross sections, long radiative lifetimes, and high efficiency. A family of barium substituted S-FAP crystals was grown in an effort to modify the pump and emission bandwidths for application to broadband diode pumping and short pulse generation. Crystals of Yb 3+:Srs5-xBax(PO4) 3F where x < 1 showed homogeneous lines offering 8.4 nm (1.8X enhancement) of absorption bandwidth and 6.9 nm (1.4X enhancement) of emission bandwidth. The gain saturation fluence of Yb:S-FAP was measured to be 3.2 J/cm 2 with homogeneous extraction using a pump-probe experiment where the probe laser was a high intensity Q-switched master oscillator power amplifier system. The crystal quality of Czochralski grown Yb:S-FAP boules, which is effected by defects such as cracking, cloudiness, bubble core, slip dislocations, and anomalous absorption, was investigated interferometrically and quantified by means of Power Spectral Density (PSD) plots. Stimulated Raman Scattering (SRS) losses were evaluated by first measuring the SRS gain coefficient to be 1.3 cm/GW, then modeling the losses in the Mercury amplifier system. Countermeasures including the addition of bandwidth to the extraction beam and wedging of amplifier surfaces are shown to reduce the SRS losses allowing efficient laser gain extraction at higher intensities. Finally, an efficient Q-switched Yb:S-FAP oscillator was developed which operates three-level at 985 nm with a 21% slope efficiency. Frequency conversion of the 985 nm light to the 2nd harmonic at 492.5 nm was achieved with a 31% conversion efficiency. A diode pumped, doubled Yb:S-FAP laser at 492.5 nm would make possible a compact, efficient, high-power blue laser source.

  11. 33 CFR 165.T13-175 - Safety Zone; M/V DAVY CROCKETT, Columbia River.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Safety Zone; M/V DAVY CROCKETT, Columbia River. 165.T13-175 Section 165.T13-175...Safety Zone; M/V DAVY CROCKETT, Columbia River. (a) Location: The following area...zone: (1) All waters of the Columbia River encompassed within the following four...

  12. L2RMAT; coupled channel inelastic scattering. [CDC7600,CYBER175; FORTRAN IV

    Microsoft Academic Search

    R. B. Walker; B. I. Schneider

    2008-01-01

    L2RMAT solves the coupled, second-order differential equations of quantum inelastic scattering theory. The physical problem is defined by user-supplied subroutines, POT and LIST.CDC7600,CYBER175; FORTRAN IV; SCOPE 2.1 (CDC7600), NOS 1.4 (CDC CYBER175); 166,000 (octal) words of memory are required to execute the sample problem..

  13. MNN; solution of close coupling equations. [CDC7600,CYBER175,74; FORTRAN IV

    Microsoft Academic Search

    D. G. Truhlar; D. Thirumalai

    2008-01-01

    MNN solves the coupled differential equations of the coupled-channel method for the quantum mechanical treatment of inelastic collisions of electrons, atoms, and molecules.CDC7600,CYBER175,74; FORTRAN IV; SCOPE 2.1 (CDC7600), NOS 1.3 (CDC CYBER175,74); 134,000 (octal) words of memory are required to execute the sample problem.

  14. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 3 2012-04-01 2012-04-01 false Hot-melt strippable food coatings. 175.230...for Use as Components of Coatings § 175.230 Hot-melt strippable food coatings. Hot-melt strippable food coatings may be...

  15. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 3 2011-04-01 2011-04-01 false Hot-melt strippable food coatings. 175.230...for Use as Components of Coatings § 175.230 Hot-melt strippable food coatings. Hot-melt strippable food coatings may be...

  16. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 3 2014-04-01 2014-04-01 false Hot-melt strippable food coatings. 175.230...for Use as Components of Coatings § 175.230 Hot-melt strippable food coatings. Hot-melt strippable food coatings may be...

  17. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 3 2010-04-01 2009-04-01 true Hot-melt strippable food coatings. 175.230...for Use as Components of Coatings § 175.230 Hot-melt strippable food coatings. Hot-melt strippable food coatings may be...

  18. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 3 2013-04-01 2013-04-01 false Hot-melt strippable food coatings. 175.230...for Use as Components of Coatings § 175.230 Hot-melt strippable food coatings. Hot-melt strippable food coatings may be...

  19. An Early Investigation of Ytterbium Nanocolloids for Selective and Quantitative “Multi-color” Spectral CT Imaging

    PubMed Central

    Pan, Dipanjan; Schirra, Carsten O.; Senpan, Angana; Schmieder, Anne H.; Stacy, Allen J.; Roessl, Ewald; Thran, Axel; Wickline, Samuel A.; Proska, Roland; Lanza, Gregory M.

    2012-01-01

    We report a novel molecular imaging agent based on Ytterbium (Yb) designed for use with Spectral “multi-color” Computed Tomogrphy (CT). Spectral CT or multi-ycolored CT provides all of the benefits of traditional CT, i.e., rapid tomographic X-ray imaging, but in addition, it simultaneously discriminates metal-rich contrast agents based on the elements unique x-ray K-edge energy signature. Our synthetic approach involved the use of organically soluble Yb(III)-complex to produce nanocolloids of Yb of noncrystalline nature incorporating high density of Yb (>500K/nanoparticle) into a stable metal particle. The resultant particles are constrained to vasculature (~200nm) and are highly selective for binding fibrin in the ruptured atherosclerotic plaque. Nanoparticles exhibited excellent signal sensitivity and the spectral CT technique uniquely discriminates the k-edge signal (60keV) of Yb from calcium (bones). Bio-elimination and preliminary bio-distribution studied reflected the overall safety and defined clearance of these particles in a rodent model. PMID:22385324

  20. Gamma-radiation-induced degradation of actively pumped single-mode ytterbium-doped optical fibers

    NASA Astrophysics Data System (ADS)

    Singleton, B.; Petrosky, J.; Pochet, M.; Usechak, N. G.; Francis, S. A.

    2014-03-01

    The integration of optical components into the digital processing units of satellite subsystems has the potential to remove interconnect bottlenecks inherent to the volume, mass, complexity, reliability and crosstalk issues of copper-based interconnects. Assuming on-board high-bandwidth communications will utilize passive optical fibers as a communication channel, this work investigates the impact of gamma irradiation from a Co-60 source on both passive optical fibers and ytterbium-doped single-mode fibers operated as amplifiers for a 1060-nm light source. Standard optical patch cables were evaluated along with active Yb-doped double-clad fibers. Varied exposure times and signal transmission wavelengths were used to investigate the degradation of the fibers exposed to total doses above 100 krad (Si). The effect on the amplified signal gain was studied for the Yb-doped fibers. The increased attenuation in the fibers across a broad wavelength range in response to multiple levels of gamma radiation exposure along with the effect that the increased attenuation has on the actively pumped Yb-doped fiber amplifier performance, is discussed.

  1. Hydration of gas-phase ytterbium ion complexes studied by experiment and theory

    SciTech Connect

    Rutkowski, Philip X; Michelini, Maria C.; Bray, Travis H.; Russo, Nino; Marcalo, Joaquim; Gibson, John K.

    2011-02-11

    Hydration of ytterbium (III) halide/hydroxide ions produced by electrospray ionization was studied in a quadrupole ion trap mass spectrometer and by density functional theory (DFT). Gas-phase YbX{sub 2}{sup +} and YbX(OH){sup +} (X = OH, Cl, Br, or I) were found to coordinate from one to four water molecules, depending on the ion residence time in the trap. From the time dependence of the hydration steps, relative reaction rates were obtained. It was determined that the second hydration was faster than both the first and third hydrations, and the fourth hydration was the slowest; this ordering reflects a combination of insufficient degrees of freedom for cooling the hot monohydrate ion and decreasing binding energies with increasing hydration number. Hydration energetics and hydrate structures were computed using two approaches of DFT. The relativistic scalar ZORA approach was used with the PBE functional and all-electron TZ2P basis sets; the B3LYP functional was used with the Stuttgart relativistic small-core ANO/ECP basis sets. The parallel experimental and computational results illuminate fundamental aspects of hydration of f-element ion complexes. The experimental observations - kinetics and extent of hydration - are discussed in relationship to the computed structures and energetics of the hydrates. The absence of pentahydrates is in accord with the DFT results, which indicate that the lowest energy structures have the fifth water molecule in the second shell.

  2. Synthesis and optical properties of powders of lutetium and yttrium double phosphates-doped by ytterbium

    NASA Astrophysics Data System (ADS)

    Guzik, M.; Legendziewicz, J.; Szuszkiewicz, W.; Walasek, A.

    2007-06-01

    This contribution is devoted to the new ytterbium-doped alkali metal lutetium double phosphates and their structural and spectroscopic characterisations. The absorption, emission and excitation spectra have been measured at 4, 10 and 293 K in the VUV to IR range. The results have been compared with the analogous yttrium phosphates. The luminescence spectra of the double phosphates have been recorded using various excitation lines, including the synchrotron radiation. The low temperature absorption and emission spectra in the region of the 2F 7/2 ? 2F 5/2 transition together with the IR spectra have been used to assign the electronic and vibronic components. Detailed analysis of the Yb 3+-doped sodium lutetium double phosphates has been performed to determine the energy levels in these hosts and to compare their optical behaviour with analogous sodium yttrium double phosphates. The emission and excitation spectra have been investigated using synchrotron radiation and the origin of the emission has been analysed proving that the emission occurs from the charge transfer state.

  3. Ablation of oxide materials and production of nanopowders by ytterbium fiber laser

    NASA Astrophysics Data System (ADS)

    Osipov, Vladimir V.; Lisenkov, Vasily V.; Platonov, Vladislav V.

    2015-03-01

    In this paper, laser radiation action on Nd3+:Y2O3 targets having the absorption 13-1.7 × 103 cm-1 is studied. During the experiment, we used the ytterbium fiber laser, which can operate both in continuous and pulse mode with the pulse duration time 0.1-1.9 ms. Laser radiation power was 200-700 W, and power density was (0.2-1.2) × 106 W/cm2. We found out the spike behavior of laser plume luminescence, large statistical variability of delay time of laser plume appearance, and spallation of front surface of the target. Aiming to explain these facts, we developed the numeric model of radiation impact on substance with non-uniform absorption coefficient. We found out the optimal laser oblation mode for nanopowder production. At laser power of 700 W, we received Nd3+:Y2O3 nanopowder with productivity up to 27 g/h. Average size of nanoparticles is 13.6 nm, and their phase is monoclinic.

  4. Flux growth of Yb(6.6)Ir(6)Sn(16) having mixed-valent ytterbium.

    PubMed

    Peter, Sebastian C; Subbarao, Udumula; Rayaprol, Sudhindra; Martin, Joshua B; Balasubramanian, Mahalingam; Malliakas, Christos D; Kanatzidis, Mercouri G

    2014-07-01

    The compound Yb6.6Ir6Sn16 was obtained as single crystals in high yield from the reaction of Yb with Ir and Sn run in excess indium. Single-crystal X-ray diffraction analysis shows that Yb6.6Ir6Sn16 crystallizes in the tetragonal space group P42/nmc with a = b = 9.7105(7) Å and c = 13.7183(11) Å. The crystal structure is composed of a [Ir6Sn16] polyanionic network with cages in which the Yb atoms are embedded. The Yb sublattice features extensive vacancies on one crystallographic site. Magnetic susceptibility measurements on single crystals indicate Curie-Weiss law behavior <100 K with no magnetic ordering down to 2 K. The magnetic moment within the linear region (<100 K) is 3.21 ?B/Yb, which is ?70% of the expected value for a free Yb(3+) ion suggesting the presence of mixed-valent ytterbium atoms. X-ray absorption near edge spectroscopy confirms that Yb6.6Ir6Sn16 exhibits mixed valence. Resistivity and heat capacity measurements for Yb6.6Ir6Sn16 indicate non-Fermi liquid metallic behavior. PMID:24921221

  5. A Three-Dimensional Optical Lattice of Ytterbium and Lithium Atomic Mixture

    E-print Network

    Hara, Hideaki; Nakajima, Shuta; Takasu, Yosuke; Takahashi, Yoshiro

    2013-01-01

    We develop an optical lattice system for an ultracold atomic gas mixture of ytterbium (174Yb) and lithium (6Li), which is an ideal system to study disorder and impurity problems. We load a Bose-Einstein condensate of 174Yb into a three-dimensional optical lattice and observe the interference patterns in time-of-flight (TOF) images. Furthermore, we perform a laser spectroscopy of 174Yb in an optical lattice using the ultra-narrow optical transition 1S0-3P2 in both cases with and without 6Li. Due to the weak interspecies interaction, we do not observe the clear influences of 6Li in the obtained interference patterns and the excitation spectra. However, this is an important first step of optical control of atomic impurity in ultracold fermions. We also measure the polarizabilities of the 3P2 state of 174Yb atoms in an optical trap with a wavelength of 1070 nm. We reveal that the polarizability can be tuned to positive, zero, or the same as the ground state, which are useful for certain applications.

  6. A Three-Dimensional Optical Lattice of Ytterbium and Lithium Atomic Gas Mixture

    NASA Astrophysics Data System (ADS)

    Hara, Hideaki; Konishi, Hideki; Nakajima, Shuta; Takasu, Yosuke; Takahashi, Yoshiro

    2014-01-01

    We develop an optical lattice system for an ultracold atomic gas mixture of ytterbium (174Yb) and lithium (6Li), which is an ideal system for studying disorder and impurity problems. We load a Bose–Einstein condensate of 174Yb into a three-dimensional optical lattice and observe its interference patterns in time-of-flight (TOF) images. Furthermore, we perform laser spectroscopy of 174Yb in an optical lattice using the ultranarrow optical transition 1S0–3P2 in both cases with and without 6Li. Owing to the weak interspecies interaction, we do not observe clear effects of 6Li in the obtained interference patterns or excitation spectra. However, this is an important first step in the optical control of atomic impurity in ultracold fermions. We also measure the polarizabilities of the 3P2 state of 174Yb atoms in an optical trap with a wavelength of 1070 nm. We reveal that the polarizability can be tuned to be positive, zero, or the same as the ground state, which is useful for certain applications.

  7. Note: Broadly tunable all-fiber ytterbium laser with 0.05 nm spectral width based on multimode interference filter

    NASA Astrophysics Data System (ADS)

    Mukhopadhyay, Pranab K.; Gupta, Pradeep K.; Singh, Amarjeet; Sharma, Sunil K.; Bindra, Kushvinder S.; Oak, Shrikant M.

    2014-05-01

    A multimode interference filter with narrow transmission bandwidth and large self-imaging wavelength interval is constructed and implemented in an ytterbium doped fiber laser in all-fiber format for broad wavelength tunability as well as narrow spectral width of the output beam. The peak transmission wavelength of the multimode interference filter was tuned with the help of a standard in-fiber polarization controller. With this simple mechanism more than 30 nm (1038 nm-1070 nm) tuning range is demonstrated. The spectral width of the output beam from the laser was measured to be 0.05 nm.

  8. Erbium-ytterbium co-doped multi-wavelength double-clad fiber laser around 1612 nm

    Microsoft Academic Search

    W. Ye; W. Liu; T. Chen; D. Z. Yang; Y. H. Shen

    2010-01-01

    We report an erbium-ytterbium (Er\\/Yb) co-doped multi-wavelength laser operation around 1612 nm. The fiber laser was constructed\\u000a in a figure-of-eight configuration and using a piece of polarization-maintaining (PM) Er\\/Yb double clad fiber as the gain\\u000a medium. The oscillation laser lines around 1612 nm could be controlled by carefully adjusting the polarization controllers\\u000a in the cavity, which might result in single

  9. 12 CFR 225.175 - What risk management, record keeping and reporting policies are required to make merchant banking...

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...required to make merchant banking investments? 225.175 Section 225... Regulations Merchant Banking Investments § 225.175 What risk...required to make merchant banking investments? (a) What internal...

  10. 12 CFR 225.175 - What risk management, record keeping and reporting policies are required to make merchant banking...

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...required to make merchant banking investments? 225.175 Section 225... Regulations Merchant Banking Investments § 225.175 What risk...required to make merchant banking investments? (a) What internal...

  11. The World Leader in Health Information and Innovation Celebrates 175 Years | NIH MedlinePlus the Magazine

    MedlinePLUS

    ... turn Javascript on. Feature: NLM 175th Anniversary The World Leader in Health Information and Innovation Celebrates 175 ... the National Library of Medicine (NLM) is the world's largest biomedical library. With some 14 million items ...

  12. 41 CFR 102-37.175 - How does a SASP find out what property is potentially available for donation?

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...property is potentially available for donation? 102-37.175 Section 102-37.175 Public Contracts and Property Management ...FEDERAL MANAGEMENT REGULATION PERSONAL PROPERTY 37-DONATION OF SURPLUS PERSONAL PROPERTY State...

  13. 41 CFR 102-192.175 - What types of support does GSA offer to Federal agency mail management programs?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    41 Public Contracts and Property Management 3 2010-07-01 2010-07-01...does GSA offer to Federal agency mail management programs? 102-192.175 Section...175 Public Contracts and Property Management Federal Property Management...

  14. 771 DHS 175.03DEPARTMENT OF HEALTH SERVICES The Wisconsin Administrative Code on this web site is current through the last published Wisconsin Register. See also Are the Codes on this

    E-print Network

    Wisconsin at Madison, University of

    771 DHS 175.03DEPARTMENT OF HEALTH SERVICES The Wisconsin Administrative Code on this web site? Register January 2012 No. 673 Chapter DHS 175 RECREATIONAL AND EDUCATIONAL CAMPS DHS 175.01 Authority and purpose. DHS 175.02 Scope. DHS 175.03 Definitions. DHS 175.04 Plan consultation. DHS 175.05 Permits. DHS

  15. Development of Trivalent Ytterbium Doped Fluorapatites for Diode-Pumped Laser Applications

    SciTech Connect

    Bayramian, A.J.

    2000-06-21

    One of the major motivators of this work is the Mercury Project, which is a 1 kW scalable diode-pumped solid-state laser system under development at Lawrence Livermore National Laboratory (LLNL). Major goals include 100 J pulses, 10% wallplug efficiency, 10 Hz repetition rate, and a 5 times diffraction limited beam. To achieve these goals the Mercury laser incorporates ytterbium doped Sr{sub 5}(PO{sub 4}){sub 3}F (S-FAP) as the amplifier gain medium. The primary focus of this thesis is a full understanding of the properties of this material which are necessary for proper design and modeling of the system. Ytterbium doped fluorapatites, which were previously investigated at LLNL, were found to be ideal candidate materials for a high power amplifier systems providing high absorption and emission cross sections, long radiative lifetimes, and high efficiency. A family of barium substituted S-FAP crystals were grown in an effort to modify the pump and emission bandwidths for application to broadband diode pumping and short pulse generation. Crystals of Yb{sup 3+}:Sr{sub 5-x}Ba{sub x}(PO{sub 4}){sub 3}F where x < 1 showed homogeneous lines offering 8.4 nm (1.8 times enhancement) of absorption bandwidth and 6.9 nm (1.4 times enhancement) of emission bandwidth. The gain saturation fluence of Yb:S-FAP was measured to be 3.2 J/cm{sup 2} using a pump-probe experiment where the probe laser was a high intensity Q-switched master oscillator power amplifier system. The extraction data was successfully fit to a homogeneous extraction model. The crystal quality of Czochralski grown Yb:S-FAP crystals, which have been plagued by many defects such as cracking, cloudiness, bubble core, slip dislocations, and anomalous absorption, was investigated interferometrically and quantified by means of Power Spectral Density (PSD) plots. The very best crystals grown to date were found to have adequate crystal quality for use in the Mercury laser system. In addition to phase distortions which are fixed by material growth, thermal loading of the S-FAP media also leads to distortions due to thermal expansion, {alpha}, temperature dependent refractive index, {partial_derivative}n/{partial_derivative}T, and stress optic effects. The stress optic coefficients necessary for modeling thermal distortions in Yb:S-FAP slab amplifiers were measured giving q{sub 33} = 0.308 x 10{sup -12} Pa{sup -1}, and q{sub 31} = 0.936 x 10{sup -12} Pa{sup -1}. Nonlinear optical losses due to high intensity laser interaction with S-FAP were evaluated including Stimulated Raman Scattering (SRS) and Stimulated Brillouin Scattering. The SRS gain coefficient was measured to be 1.3 cm/GW. The SRS losses in the Mercury amplifier system were successfully modeled and shown to be an issue for high-energy short pulse operation. Countermeasures including the addition of bandwidth to the extraction beam and wedging of amplifier surfaces would allow operation of the Mercury laser at 100 J and 2 ns output below SRS threshold. A simple model of SBS losses in the Mercury laser system shows SBS will also be a problem, however suppression is possible with the introduction of moderate bandwidth (relative to the SRS case). Finally, a Q-switched Yb:S-FAP oscillator was developed which operates three-level at 985 nm with a 21% slope efficiency. Frequency conversion of the 985 nm light to the 2nd harmonic at 492.5 nm was achieved with a 31% conversion efficiency. A diode pumped, doubled Yb:S-FAP laser at 492.5 nm would make a compact efficient blue laser source.

  16. Ultracold Mixtures of Rubidium and Ytterbium for Open Quantum System Engineering

    NASA Astrophysics Data System (ADS)

    Herold, Creston David

    Exquisite experimental control of quantum systems has led to sharp growth of basic quantum research in recent years. Controlling dissipation has been crucial in producing ultracold, trapped atomic samples. Recent theoretical work has suggested dissipation can be a useful tool for quantum state preparation. Controlling not only how a system interacts with a reservoir, but the ability to engineer the reservoir itself would be a powerful platform for open quantum system research. Toward this end, we have constructed an apparatus to study ultracold mixtures of rubidium (Rb) and ytterbium (Yb). We have developed a Rb-blind optical lattice at 423.018(7) nm, which will enable us to immerse a lattice of Yb atoms (the system) into a Rb BEC (superfluid reservoir). We have produced Bose-Einstein condensates of 170Yb and 174Yb, two of the five bosonic isotopes of Yb, which also has two fermionic isotopes. Flexible optical trapping of Rb and Yb was achieved with a two-color dipole trap of 532 and 1064 nm, and we observed thermalization in ultracold mixtures of Rb and Yb. Using the Rb-blind optical lattice, we measured very small light shifts of 87Rb BECs near the light shift zero-wavelengths adjacent the 6p electronic states, through a coherent series of lattice pulses. The positions of the zero-wavelengths are sensitive to the electric dipole matrix elements between the 5s and 6p states, and we made the first experimental measurement of their strength. By measuring a light shift, we were not sensitive to excited state branching ratios, and we achieved a precision better than 0.3%.

  17. Effect of implantation of ytterbium ions into the surface of a nickel alloy on the composition and structure of VSDP-11 vacuum-plasma coating

    Microsoft Academic Search

    A. A. Bybin; R. R. Nev'yantseva; N. F. Izmailova

    2007-01-01

    The structure and the phase composition of VSDP-11 vacuum plasma coating formed on TsNK-7P nickel alloy after preliminary\\u000a implantation of the surface with ytterbium ions and the changes in the concentration of chemical elements over the thickness\\u000a of the protective coating are considered.

  18. Lung clearance, translocation, and acute toxicity of arsenic, beryllium, cadmium, cobalt, lead, selenium, vanadium, and ytterbium oxides following deposition in rat lung

    Microsoft Academic Search

    K. Rhoads; C. L. Sanders

    1985-01-01

    Young adult rats were exposed via inhalation or intratracheal instillation to oxides of arsenic, beryllium, cadmium, cobalt, lead, selenium, vanadium, and ytterbium. Serial necropsies were performed to assess the metal content in organs at times up to several weeks after exposure. The lung clearance varied widely for these compounds, and the times to remove 50% of the initial burden ranged

  19. Direct asymmetric vinylogous Michael addition of 3-alkylidene oxindoles to chalcones catalyzed by a chiral N,N'-dioxide ytterbium(III) complex.

    PubMed

    Xiao, Xiao; Mei, Hongjiang; Chen, Quangang; Zhao, Xiaohu; Lin, Lili; Liu, Xiaohua; Feng, Xiaoming

    2015-01-11

    A chiral ytterbium(III)-N,N'-dioxide catalyst system has been developed for the catalytic direct asymmetric vinylogous Michael addition of 3-alkylidene oxindoles to chalcones, delivering the ?-substituted alkylideneoxindoles in high yields, enantioselectivities and good Z/E selectivities under mild reaction conditions. PMID:25413247

  20. Briceo et al.: Courtship after Aromatherapy 175 MALE COURTSHIP BEHAVIOR IN CERATITIS CAPITATA

    E-print Network

    Bermingham, Eldredge

    Briceño et al.: Courtship after Aromatherapy 175 MALE COURTSHIP BEHAVIOR IN CERATITIS CAPITATA (DIPTERA: TEPHRITIDAE) THAT HAVE RECEIVED AROMATHERAPY WITH GINGER ROOT OIL DANIEL BRICEÑO1 , WILLIAM fruit flies Ceratitis capitata (Wiedemann) to ginger root oil ("aromatherapy") increases the likelihood

  1. 48 CFR 217.175 - Multiyear contracts for electricity from renewable energy sources.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Multiyear contracts for electricity from renewable energy sources. 217... 217.175 Multiyear contracts for electricity from renewable energy sources. ...exceed 10 years for the purchase of electricity from sources of renewable...

  2. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Soil and water conservation expenditures; in general... § 1.175-1 Soil and water conservation expenditures; in general...farmer may deduct his soil or water conservation expenditures which...

  3. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

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  4. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

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  5. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

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  6. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

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  7. 49 CFR 175.310 - Transportation of flammable liquid fuel; aircraft only means of transportation.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Transportation of flammable liquid fuel; aircraft only means of transportation. 175...HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT Specific Regulations Applicable According...Transportation of flammable liquid fuel; aircraft only means of transportation....

  8. 49 CFR 175.310 - Transportation of flammable liquid fuel; aircraft only means of transportation.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Transportation of flammable liquid fuel; aircraft only means of transportation. 175...HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT Specific Regulations Applicable According...Transportation of flammable liquid fuel; aircraft only means of transportation....

  9. 49 CFR 175.310 - Transportation of flammable liquid fuel; aircraft only means of transportation.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Transportation of flammable liquid fuel; aircraft only means of transportation. 175...HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT Specific Regulations Applicable According...Transportation of flammable liquid fuel; aircraft only means of transportation....

  10. 49 CFR 175.310 - Transportation of flammable liquid fuel; aircraft only means of transportation.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Transportation of flammable liquid fuel; aircraft only means of transportation. 175...HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT Specific Regulations Applicable According...Transportation of flammable liquid fuel; aircraft only means of transportation....

  11. 49 CFR 175.310 - Transportation of flammable liquid fuel; aircraft only means of transportation.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Transportation of flammable liquid fuel; aircraft only means of transportation. 175...HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT Specific Regulations Applicable According...Transportation of flammable liquid fuel; aircraft only means of transportation....

  12. DETAIL VIEW OF THE 175TON BRIDGE CRANE WITHIN THE TRANSFER ...

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

    DETAIL VIEW OF THE 175-TON BRIDGE CRANE WITHIN THE TRANSFER AISLE, FACING NORTH - Cape Canaveral Air Force Station, Launch Complex 39, Vehicle Assembly Building, VAB Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

  13. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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  14. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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  15. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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  16. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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  17. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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  18. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...POINT SOURCE CATEGORY Alaskan Mechanized Salmon Processing Subcategory § 408.175...this subpart: (1) Any mechanized salmon processing facility located in population...0 to 9.0. (2) Any mechanized salmon processing facility not covered...

  19. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...POINT SOURCE CATEGORY Alaskan Mechanized Salmon Processing Subcategory § 408.175...this subpart: (1) Any mechanized salmon processing facility located in population...0 to 9.0. (2) Any mechanized salmon processing facility not covered...

  20. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...POINT SOURCE CATEGORY Alaskan Mechanized Salmon Processing Subcategory § 408.175...this subpart: (1) Any mechanized salmon processing facility located in population...0 to 9.0. (2) Any mechanized salmon processing facility not covered...

  1. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...POINT SOURCE CATEGORY Alaskan Mechanized Salmon Processing Subcategory § 408.175...this subpart: (1) Any mechanized salmon processing facility located in population...0 to 9.0. (2) Any mechanized salmon processing facility not covered...

  2. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...POINT SOURCE CATEGORY Alaskan Mechanized Salmon Processing Subcategory § 408.175...this subpart: (1) Any mechanized salmon processing facility located in population...0 to 9.0. (2) Any mechanized salmon processing facility not covered...

  3. 41 CFR 102-41.175 - May we sell unclaimed personal property?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 false May we sell unclaimed personal property? 102-41.175 Section...Continued) FEDERAL MANAGEMENT REGULATION PERSONAL PROPERTY 41-DISPOSITION OF SEIZED...VOLUNTARILY ABANDONED, AND UNCLAIMED PERSONAL PROPERTY Unclaimed Personal...

  4. 41 CFR 102-41.175 - May we sell unclaimed personal property?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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  5. 24 CFR 990.175 - Utilities expense level: Computation of the current consumption level.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... Utilities expense level: Computation of the current consumption level. 990.175 Section 990... Utilities expense level: Computation of the current consumption level. The current consumption level shall be the actual amount...

  6. 24 CFR 990.175 - Utilities expense level: Computation of the current consumption level.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... Utilities expense level: Computation of the current consumption level. 990.175 Section 990... Utilities expense level: Computation of the current consumption level. The current consumption level shall be the actual amount...

  7. 24 CFR 990.175 - Utilities expense level: Computation of the current consumption level.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... Utilities expense level: Computation of the current consumption level. 990.175 Section 990... Utilities expense level: Computation of the current consumption level. The current consumption level shall be the actual amount...

  8. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Detergents by Dry Blending Subcategory § 417.175 Standards of performance for new...

  9. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Detergents by Dry Blending Subcategory § 417.175 Standards of performance for new...

  10. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Detergents by Dry Blending Subcategory § 417.175 Standards of performance for new...

  11. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Detergents by Dry Blending Subcategory § 417.175 Standards of performance for new...

  12. 40 CFR 429.175 - Pretreatment standards for existing sources (PSES).

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...CONTINUED) EFFLUENT GUIDELINES AND STANDARDS TIMBER PRODUCTS PROCESSING POINT SOURCE CATEGORY Wood Furniture and Fixture Production With Water Wash Spray Booth(s) or With Laundry Facilities Subcategory § 429.175 Pretreatment...

  13. 40 CFR 429.175 - Pretreatment standards for existing sources (PSES).

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...CONTINUED) EFFLUENT GUIDELINES AND STANDARDS TIMBER PRODUCTS PROCESSING POINT SOURCE CATEGORY Wood Furniture and Fixture Production With Water Wash Spray Booth(s) or With Laundry Facilities Subcategory § 429.175 Pretreatment...

  14. 26 CFR 1.175-3 - Definition of “the business of farming.”

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...either as owner or tenant. For the purpose of section 175, a taxpayer...in the business of farming. For the purpose of this section, the term farm is used in its ordinary, accepted sense and includes stock, dairy,...

  15. 7 CFR 4279.175 - Domestic lamb industry adjustment assistance program set aside.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 2013-01-01 false Domestic lamb industry adjustment assistance program set aside...AGRICULTURE GUARANTEED LOANMAKING Business and Industry Loans § 4279.175 Domestic lamb industry adjustment assistance program set...

  16. 7 CFR 4279.175 - Domestic lamb industry adjustment assistance program set aside.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 2014-01-01 false Domestic lamb industry adjustment assistance program set aside...AGRICULTURE GUARANTEED LOANMAKING Business and Industry Loans § 4279.175 Domestic lamb industry adjustment assistance program set...

  17. 7 CFR 4279.175 - Domestic lamb industry adjustment assistance program set aside.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 2011-01-01 false Domestic lamb industry adjustment assistance program set aside...AGRICULTURE GUARANTEED LOANMAKING Business and Industry Loans § 4279.175 Domestic lamb industry adjustment assistance program set...

  18. 7 CFR 4279.175 - Domestic lamb industry adjustment assistance program set aside.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 2010-01-01 false Domestic lamb industry adjustment assistance program set aside...AGRICULTURE GUARANTEED LOANMAKING Business and Industry Loans § 4279.175 Domestic lamb industry adjustment assistance program set...

  19. 7 CFR 4279.175 - Domestic lamb industry adjustment assistance program set aside.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 2012-01-01 false Domestic lamb industry adjustment assistance program set aside...AGRICULTURE GUARANTEED LOANMAKING Business and Industry Loans § 4279.175 Domestic lamb industry adjustment assistance program set...

  20. STUDIES OF MOLECULAR CLOUDS ASSOCIATED WITH H II REGIONS: S175

    SciTech Connect

    Azimlu, Mohaddesseh; Fich, Michel; McCoey, Carolyn [Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1 (Canada)

    2009-06-15

    We are studying the impact of H II regions on star formation in their associated molecular clouds. In this paper, we present James Clerk Maxwell Telescope R x A molecular line observations of S175 and environs. This is the first within a sample of 10 H II regions and their surrounding molecular clouds selected for our study. We first make 7' x 7' maps in {sup 12}CO(2-1), which are used to investigate the structure of the cloud and to identify individual clumps. Single point observations were made in {sup 13}CO(2-1) and CS(5-4) at the peak of the {sup 12}CO(2-1) emission within each clump in order to measure the physical properties of the gas. Densities, temperatures, clump masses, peak velocities, and line widths were measured and calculated using these observations. We have identified two condensations (S175A and S175B) in the molecular cloud associated with this H II region. S175A is adjacent to the ionization front and is expected to be affected by the H II region, while S175B is too distant to be disturbed. We compare the structure and gas properties of these two regions to investigate how the molecular gas has been affected by the H II region. S175A has been heated by the H II region and partially compressed by the ionized gas front, but contrary to our expectation it is a quiescent region while S175B is very turbulent and dynamically active. Our investigation for the source of turbulence in S175B resulted in the detection of an outflow within this region.

  1. PC; coupled molecular scattering equations. [CDC7600,CYBER175; FORTRAN IV

    Microsoft Academic Search

    Thomas

    2008-01-01

    PC solves the coupled, second-order differential equations of atomic and molecular quantum scattering theory. The program is independent of the chemical system or the method (close coupling, coupled states, etc.). The physical problem is defined by user-supplied subroutines, POT and LIST.CDC7600,CYBER175; FORTRAN IV; SCOPE 2.1 (CDC7600), NOS 1.3 (CDC CYBER175); 143,000 (octal) words of memory are required to execute the

  2. DEVOG; coupled molecular scattering equations. [CDC7600,CYBER175; FORTRAN IV

    Microsoft Academic Search

    Thomas

    2008-01-01

    DEVOG solves the coupled, second-order differential equations of atomic and molecular quantum scattering theory. The program is independent of the chemical system or the method (close coupling, coupled states, etc.). The physical problem is defined by user-supplied subroutines, POT and LIST.CDC7600,CYBER175; FORTRAN IV; SCOPE 2.1 (CDC7600), NOS 1.3 (CDC CYBER175); 144,000 (octal) words of memory are required to execute the

  3. Investigation of (d,x) nuclear reactions on natural ytterbium up to 24 MeV

    NASA Astrophysics Data System (ADS)

    Khandaker, Mayeen Uddin; Haba, Hiromitsu; Otuka, Naohiko; Usman, Ahmed Rufa'i.

    2014-09-01

    Production cross-sections of the natYb(d,x)169,170,171,172,173,174m,174,176m,177gLu and 169,175,177Yb reactions have been measured from a 24-MeV deuteron energy down to their respective thresholds by using a stacked-foil activation technique combined with high resolution ?-ray spectrometry. Our new experimental data extended the experimental database toward the lower energy region for 169Yb, 171Lu, 172Lu, and 176mLu, and the higher region for 174Lu, 176mLu, and 177Yb. An overall good agreement is found with some of the earlier measurements, whereas a partial agreement is obtained with the theoretical data extracted from the TENDL-2013 library. The (d,p) channel contribution underestimated by the TENDL-2013 library is successfully reproduced in the global renormalization by Ignatyuk for the FENDL-3.0 library. The production cross-sections of 175Yb available in the literature were revised based on the latest ?-ray intensity adopted in 2004. Physical thick target yields for the investigated reaction products were also deduced and compared with the directly measured ones in the literature. The derived thick target yields for 173Lu and 174gLu are higher than the directly measured ones by Dmitriev et al. at 22 MeV. The deduced yield curves indicate that a low energy (<11 MeV) cyclotron and a highly enriched 176Yb target could be used to obtain 177gLu with negligible impurity from 177mLu.

  4. Reconstitution of {beta}-carotene hydroxylase activity of thermostable CYP175A1 monooxygenase

    SciTech Connect

    Momoi, Kyoko [Institute of Technical Biochemistry, University of Stuttgart, Stuttgart 70569 (Germany); Hofmann, Ute [Dr. Margarete Fischer-Bosch-Institut fuer Klinische Pharmakologie, Stuttgart 70376 (Germany); Schmid, Rolf D. [Institute of Technical Biochemistry, University of Stuttgart, Stuttgart 70569 (Germany); Urlacher, Vlada B. [Institute of Technical Biochemistry, University of Stuttgart, Stuttgart 70569 (Germany)]. E-mail: itbvkha@po.uni-stuttgart.de

    2006-01-06

    CYP175A1 is a thermostable P450 Monooxygenase from Thermus thermophilus HB27, demonstrating in vivo activity towards {beta}-carotene. Activity of CYP175A1 was reconstituted in vitro using artificial electron transport proteins. First results were obtained in the mixture with a crude Escherichia coli cell extract at 37 {sup o}C. In this system, {beta}-carotene was hydroxylated to {beta}-cryptoxanthin. The result indicated the presence of electron transport enzymes among the E. coli proteins, which are suitable for CYP175A1. However, upon in vitro reconstitution of CYP175A1 activity with purified recombinant flavodoxin and flavodoxin reductase from E. coli, only very low {beta}-cryptoxanthin production was observed. Remarkably, with another artificial electron transport system, putidaredoxin and putidaredoxin reductase from Pseudomonas putida, purified CYP175A1 enzyme hydroxylated {beta}-carotene at 3- and also 3'-positions, resulting in {beta}-cryptoxanthin and zeaxanthin. Under the optimal reaction conditions, the turnover rate of the enzyme reached 0.23 nmol {beta}-cryptoxanthin produced per nmol P450 per min.

  5. Slope efficiency over 30% single-frequency ytterbium-doped fiber laser based on Sagnac loop mirror filter.

    PubMed

    Yin, Mojuan; Huang, Shenghong; Lu, Baole; Chen, Haowei; Ren, Zhaoyu; Bai, Jintao

    2013-09-20

    A high-slope-efficiency single-frequency (SF) ytterbium-doped fiber laser, based on a Sagnac loop mirror filter (LMF), was demonstrated. It combined a simple linear cavity with a Sagnac LMF that acted as a narrow-bandwidth filter to select the longitudinal modes. And we introduced a polarization controller to restrain the spatial hole burning effect in the linear cavity. The system could operate at a stable SF oscillating at 1064 nm with the obtained maximum output power of 32 mW. The slope efficiency was found to be primarily dependent on the reflectivity of the fiber Bragg grating. The slope efficiency of multi-longitudinal modes was higher than 45%, and the highest slope efficiency of the single longitudinal mode we achieved was 33.8%. The power stability and spectrum stability were <2% and <0.1%, respectively, and the signal-to-noise ratio measured was around 60 dB. PMID:24085181

  6. Low noise single-frequency single-polarization ytterbium-doped phosphate fiber laser at 1083 nm.

    PubMed

    Xu, Shanhui; Li, Can; Zhang, Weinan; Mo, Shupei; Yang, Changsheng; Wei, Xiaoming; Feng, Zhouming; Qian, Qi; Shen, Shaoxiong; Peng, Mingying; Zhang, Qinyuan; Yang, Zhongmin

    2013-02-15

    We present a low noise single-frequency and single-polarization distributed Bragg reflector fiber laser at 1083 nm by using a 1.8 cm long newly developed ytterbium-doped phosphate single mode glass fiber. The maximum output power is more than 100 mW with a slope efficiency of >29.6%. The signal to noise ratio is higher than 61 dB and the laser linewidth of less than 2 kHz is estimated. The obtained relative intensity noise for frequencies of over 4.0 MHz is less than -150 dB/Hz, which approaches the shot noise limit. The achieved linear polarization extinction ratio is more than 30 dB. PMID:23455116

  7. Dual-core ytterbium fiber amplifier for high-power 1060 nm swept source multichannel optical coherence tomography imaging.

    PubMed

    Harduar, Mark K; Mariampillai, Adrian; Vuong, Barry; Gu, Xijia; Standish, Beau A; Yang, Victor X D

    2011-08-01

    A novel (to our knowledge) dual-core ytterbium (Yb(3+)) doped fiber, as an optically pumped amplifier, boosts the output power from a 1060 nm swept source laser beyond 250 mW, while providing a wavelength tuning range of 93 nm, for optical coherence tomography (OCT) imaging. The design of the dual-core Yb-doped fiber amplifier and its multiple wavelength optical pumping scheme to optimize output bandwidth are discussed. Use of the dual-core fiber amplifier showed no appreciable degradation to the coherence length of the seed laser. The signal intensity improvement of this amplifier is demonstrated on a multichannel in vivo OCT imaging system at 1060 nm. PMID:21808377

  8. Frequency Stabilization of a 369 nm Diode Laser by Nonlinear Spectroscopy of Ytterbium Ions in a Discharge

    E-print Network

    Michael W Lee; Marie Claire Jarratt; Christian Marciniak; Michael J Biercuk

    2014-02-06

    We demonstrate stabilisation of an ultraviolet diode laser via Doppler free spectroscopy of Ytterbium ions in a discharge. Our technique employs polarization spectroscopy, which produces a natural dispersive lineshape whose zero-crossing is largely immune to environmental drifts, making this signal an ideal absolute frequency reference for Yb$^+$ ion trapping experiments. We stabilise an external-cavity diode laser near 369 nm for cooling Yb$^+$ ions, using amplitude-modulated polarisation spectroscopy and a commercial PID feedback system. We achieve stable, low-drift locking with a standard deviation of measured laser frequency ~400 kHz over 10 minutes, limited by the instantaneous linewidth of the diode laser. These results and the simplicity of our optical setup makes our approach attractive for stabilization of laser sources in atomic-physics applications.

  9. Frequency stabilization of a 369 nm diode laser by nonlinear spectroscopy of Ytterbium ions in a discharge.

    PubMed

    Lee, Michael W; Jarratt, Marie Claire; Marciniak, Christian; Biercuk, Michael J

    2014-03-24

    We demonstrate stabilization of an ultraviolet diode laser via Doppler-free spectroscopy of Ytterbium ions in a discharge. Our technique employs polarization spectroscopy, which produces a natural dispersive lineshape whose zero-crossing is largely immune to environmental drifts, making this signal an ideal absolute frequency reference for Yb+ ion trapping experiments. We stabilize an external-cavity diode laser near 369 nm for cooling Yb+ ions, using amplitude modulated polarization spectroscopy and a commercial PID feedback system. We achieve stable, low-drift locking with a standard deviation of measured laser frequency ? 400 kHz over 10 minutes, limited by the instantaneous linewidth of the diode laser. These results and the simplicity of our optical setup makes our approach attractive for stabilization of laser sources in atomic physics applications. PMID:24664069

  10. Oligo-Astheno-Teratozoospermia in Mice Lacking RA175\\/TSLC1\\/SynCAM\\/IGSF4A, a Cell Adhesion Molecule in the Immunoglobulin Superfamily

    Microsoft Academic Search

    Eriko Fujita; Yoriko Kouroku; Satomi Ozeki; Yuko Tanabe; Yoshiro Toyama; Mamiko Maekawa; Naosuke Kojima; Haruki Senoo; Kiyotaka Toshimori; Takashi Momoi

    2006-01-01

    RA175\\/TSLC1\\/SynCAM\\/IGSF4A (RA175), a member of the immunoglobulin superfamily with Ca2-inde- pendent homophilic trans-cell adhesion activity, participates in synaptic and epithelial cell junctions. To clarify the biological function of RA175, we disrupted the mouse Igsf4a (Ra175\\/Tslc1\\/SynCam\\/Igsf4a Ra175) gene. Male mice lacking both alleles of Ra175 (Ra175\\/) were infertile and showed oligo-astheno-teratozoospermia; almost no mature motile spermatozoa were found in the epididymis.

  11. Erbium:ytterbium fiber-laser system delivering watt-level femtosecond pulses using divided pulse amplification

    NASA Astrophysics Data System (ADS)

    Herda, Robert; Zach, Armin

    2015-03-01

    We present an Erbium:Ytterbium codoped fiber-amplifer system based on Divided-Pulses-Amplification (DPA) for ultrashort pulses. The output from a saturable-absorber mode-locked polarization-maintaining (PM) fiber oscillator is amplified in a PM normal-dispersion Erbium-doped fiber. After this stage the pulses are positively chirped and have a duration of 2.0 ps at an average power of 93 mW. A stack of 5 birefringent Yttrium-Vanadate crystals divides these pulses 32 times. We amplify these pulses using a double-clad Erbium:Ytterbium codoped fiber pumped through a multimode fiber combiner. The pulses double pass the amplifier and recombine in the crystals using non-reciprocal polarization 90° rotation by a Faraday rotating mirror. Pulses with a duration of 144 fs are obtained after separation from the input beam using a polarizing beam splitter cube. These pulses have an average power of 1.85 W at a repetition rate of 80 MHz. The generation of femtosecond pulses directly from the amplifier was enabled by a positively chirped seed pulse, normally dispersive Yttrium-Vanadate crystals, and anomalously dispersive amplifier fibers. Efficient frequency doubling to 780 nm with an average power of 725 mW and a pulse duration of 156 fs is demonstrated. In summary we show a DPA setup that enables the generation of femtosecond pulses at watt-level at 1560 nm without the need for further external dechirping and demonstrate a good pulse quality by efficient frequency doubling. Due to the use of PM fiber components and a Faraday rotator the setup is environmentally stable.

  12. Bladder-Relaxant Properties of the Novel Benzofuroindole Analogue LDD175

    Microsoft Academic Search

    Ike Campomayor dela Peña; Seo Young Yoon; Sung Mok Kim; Geum Seon Lee; Jong Hoon Ryu; Chul-Seung Park; Yong Chul Kim; Jae Hoon Cheong

    2009-01-01

    The present study describes the bladder-relaxant properties of LDD175 (4-chloro-7-trifluoromethyl-10H-benzo[4,5]furo [3,2-b]indole-1-carboxylic acid), a novel benzofuroindole compound. LDD175 had no significant effect on the spontaneous and electrically evoked bladder contractions, but produced concentration-dependent relaxation in strips precontracted by 1 ?mol\\/l acetylcholine (pEC50 = 5.9 ± 0.2, Emax = 90.3 ± 2.6%; 100 ?mol\\/l, n = 6). In high K+- (20 and

  13. Improved cycling behavior of ZEBRA battery operated at intermediate temperature of 175°C

    SciTech Connect

    Li, Guosheng; Lu, Xiaochuan; Kim, Jin Yong; Lemmon, John P.; Sprenkle, Vincent L.

    2014-01-01

    Operation of the sodium-nickel chloride battery at temperatures below 200°C reduces cell degradation and improves cyclability. One of the main technical issues with operating this battery at intermediate temperatures such as 175°C is the poor wettability of molten sodium on ?”-alumina solid electrolyte (BASE), which causes reduced active area and limits charging. In order to overcome the poor wettability of molten sodium on BASE at 175°C, a Pt grid was applied on the anode side of the BASE using a screen printing technique. Cells with their active area increased by metallized BASEs exhibited deeper charging and stable cycling behavior.

  14. Improved cycling behavior of ZEBRA battery operated at intermediate temperature of 175°C

    SciTech Connect

    Li, Guosheng; Lu, Xiaochuan; Kim, Jin Yong; Lemmon, John P.; Sprenkle, Vincent L.

    2014-03-01

    Operation of sodium-nickel chloride battery at temperatures lower than 200°C reduces cell degradation and improves the cyclability. One of the main technical issues in terms of operating this battery at intermediate temperatures such as 175°C is the poor wettability of sodium melt on ?”-alumina solid electrolyte (BASE) causing reduced active area and limited charging . In order to overcome the problem related to poor wettability of Na melt on BASE at 175°C, Pt grid was applied on the anode side of BASE using a screen printing technique. Deeper charging and improved cycling behavior was observed on the cells with metalized BASEs due to extended active area.

  15. Quantitative structure-property relationships for colour reagents and their colour reactions with ytterbium using regression analysis and computational neural networks

    Microsoft Academic Search

    Hua Li; Lu Xu; Yiqiu Yang; Qiang Su

    1996-01-01

    In this paper, the new topological indices Ax1?Ax3 suggested in our laboratory and molecular connectivity indices have been applied to multivariate analysis in structure-property studies. The topological indices of twenty asymmetrical phosphono bisazo derivatives of chromotropic acid have been calculated. The structure-property relationships between colour reagents and their colour reactions with ytterbium have been studied by Ax1?Ax3 indices and molecular

  16. Study of ytterbium doping effects on structural, mechanical and opto-thermal properties of sprayed ZnO thin films using the Boubaker Polynomials Expansion Scheme (BPES)

    Microsoft Academic Search

    A. Amlouk; K. Boubaker; M. Amlouk; M. Bouhafs

    2009-01-01

    In this work, ZnO thin films have been grown on glass substrates by using a solution of propanol (C3H8O), water (H2O) and zinc acetate (Zn(CH3CO2)2) in acidified medium (pH 5). The obtained films were n doped with ytterbium (Yb) at the rates of 100, 200 and 300ppm. The structural features of the doped films were investigated using XRD, atomic force

  17. The Practical Implementation of Regulatory Guide 1.75 in Nuclear Plant Instrumentation Systems

    Microsoft Academic Search

    John W. Davis; Richard G. Schultze

    1977-01-01

    Implementation of the principles of IEEE 384 and Regulatory Guide 1.75 can help to assure that independence between redundant Class 1E systems is achieved. But designers should not lose sight of the several ways in which this goal can be accomplished. In selecting which method to use in a particular circuit or system, the reliability, maintainability, and cost of each

  18. 33 CFR 175.25 - Enforcement of State requirements for children to wear personal flotation devices.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Enforcement of State requirements for children to wear personal flotation devices. 175.25...Enforcement of State requirements for children to wear personal flotation devices. (a...requirement for children of a certain age to wear an appropriate PFD approved by the...

  19. 33 CFR 175.25 - Enforcement of State requirements for children to wear personal flotation devices.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...Enforcement of State requirements for children to wear personal flotation devices. 175.25...Enforcement of State requirements for children to wear personal flotation devices. (a...requirement for children of a certain age to wear an appropriate PFD approved by the...

  20. Gastric Invasive Micropapillary Carcinoma with Intestinal Phenotypes Harboring a TP53 R175H Mutation

    PubMed Central

    Ikeda, Hideyuki; Kukitsu, Takehiro; Johmen, Wataru; Nakamura, Hajime; Yamauchi, Natumi; Ishikawa, Kazuma; Saikawa, Takashi; Noda, Sayaka; Saitoh, Tadanori; Ueno, Yoshinori; Noda, Yuuya; Yamazaki, Sayuki; Kuroda, Yoshikazu; Koshiko, Susumu; Sasagawa, Yutaka

    2014-01-01

    We report a case of gastric invasive micropapillary carcinoma (IMPC) in an 86-year-old female patient. She was admitted to our hospital with a chief complaint of bloody emesis. Upper gastrointestinal endoscopy found a gastric adenocarcinoma at the antrum. The biopsy specimens showed moderately differentiated adenocarcinoma with invasive small tumor nests. Distal gastrectomy with systematic lymph node dissection demonstrated that the tumor had IMPC through a pathological examination. Despite the depth of tumor invasion (the submucosa), extensive lymph node metastases were observed. Anti-D2-40 immunostaining revealed numerous infiltrating tumor cell nests in the lymphatic vessels, which could explain subsequent multiple lymph node metastases. The adenocarcinoma showed intestinal phenotypes by several immunohistochemical studies. One of these antibodies (CD10) clearly demonstrated the inverted apical-basal (inside-out) pattern of IMPC, whereas it showed an ordinary pattern in intestinal metaplasia adjacent to the tumor. Furthermore, genetic analysis by direct sequencing revealed a point mutation in the exon 5 of TP53 in the tumor. The mutation presumably harbors a missense mutation from Arg to His at the codon 175 (R175H). R175H has been previously described as a ‘gain-of-function’ mutation with a high invasive or metastatic potential in several types of cancers. In summary, this is one of the first reported cases of gastric IMPC with intestinal phenotypes harboring a TP53 R175H mutation in the literature. PMID:25408652

  1. 175June 20001 HERPETOLOGICA the Mexican kingsnake, Lampropeltis nexicana. brown tree snake (Boiga irregularis). Toxicon 29

    E-print Network

    Blouin-Demers, Gabriel

    175June 20001 HERPETOLOGICA the Mexican kingsnake, Lampropeltis nexicana. brown tree snake (Boiga colu- H HIT TIER, J. M., AND D. LIMPUS.1996. Reproduc- brid snakes with remarks on combat in other col- tive patterns of a biologically in\\,asive species: the ubrid and elapid snakes. Herpetologica 7

  2. Observation of an octupole?quasiparticle band in 175Lu using photon scattering experiments

    NASA Astrophysics Data System (ADS)

    Herzberg, R.-D.; Fransen, C.; Fischer, R.; Beck, O.; Belic, D.; Besserer, J.; von Brentano, P.; Eckert, Th.; Kneissl, U.; Krischok, B.; Margraf, J.; Maser, H.; Nord, A.; Pietralla, N.; Pitz, H. H.; Wolpert, A.; Zilges, A.

    1997-11-01

    A nuclear resonance fluorescence (NRF) study was performed on the heavy deformed nucleus 175Lu. We observe the beginning of a rotational band built on the coupling of the unpaired proton to the K?=0- octupole vibration in the neighboring nucleus 174Yb. The dipole strength distribution is also discussed in terms of the scissors mode.

  3. World Precision Instruments, Inc. International Trade Center, 175 Sarasota Center Blvd., Sarasota FL 34240-9258

    E-print Network

    Kleinfeld, David

    World Precision Instruments, Inc. USA International Trade Center, 175 Sarasota Center Blvd.pipetter.com A395D, A395R Linear Stimulus Isolator World Precision Instruments INSTRUCTION MANUAL Serial No._____________________ 092608 www.wpiinc.com #12;Copyright © 2008 by World Precision Instruments, Inc. All rights reserved

  4. World Precision Instruments, Inc. International Trade Center, 175 Sarasota Center Blvd., Sarasota FL 34240-9258

    E-print Network

    Kleinfeld, David

    World Precision Instruments, Inc. USA International Trade Center, 175 Sarasota Center Blvd-mail: wpide@wpi-europe.com China & Hong Kong WPI Shanghai Trading Co., Ltd. Rm 20a, No8 Dong Fang Rd., Lu Jia- audio frequency range World Precision Instruments INSTRUCTION MANUAL Serial No

  5. SIDA 22(1): 151 175. 2006 TAXONOMY OF THE CUSCUTA PENTAGONA COMPLEX

    E-print Network

    SIDA 22(1): 151 ­ 175. 2006 TAXONOMY OF THE CUSCUTA PENTAGONA COMPLEX (CONVOLVULACEAE) IN NORTH ABSTRACT Cuscuta pentagona, C. campestris, and C. glabrior are closely similar taxa recognized here three varieties of Cuscuta pentagona Engelm. in addition to the typical form: var. calycina, var

  6. Journal of Econometrics 39 (1988) 175-198. North-Holland LATENT VARIABLES, CAUSAL MODELS AND

    E-print Network

    Spirtes, Peter

    1988-01-01

    Journal of Econometrics 39 (1988) 175-198. North-Holland LATENT VARIABLES, CAUSAL MODELS should not appear as latent in econometric models of the British case [see Klein (1961) for an example on both variables? In this paper, we describe an approach towards model specification developed more fully

  7. 36 CFR 1192.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...1192.175 High-speed rail cars, monorails and systems. (a) All cars for high-speed rail systems...not limited to those using “maglev” or high speed steel-wheel-on-steel-rail...111(a) for each type of car which is similar to...

  8. 36 CFR 1192.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...1192.175 High-speed rail cars, monorails and systems. (a) All cars for high-speed rail systems...not limited to those using “maglev” or high speed steel-wheel-on-steel-rail...111(a) for each type of car which is similar to...

  9. 36 CFR 1192.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...1192.175 High-speed rail cars, monorails and systems. (a) All cars for high-speed rail systems...not limited to those using “maglev” or high speed steel-wheel-on-steel-rail...111(a) for each type of car which is similar to...

  10. 36 CFR 1192.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...1192.175 High-speed rail cars, monorails and systems. (a) All cars for high-speed rail systems...not limited to those using “maglev” or high speed steel-wheel-on-steel-rail...111(a) for each type of car which is similar to...

  11. 36 CFR 1192.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...1192.175 High-speed rail cars, monorails and systems. (a) All cars for high-speed rail systems...not limited to those using “maglev” or high speed steel-wheel-on-steel-rail...111(a) for each type of car which is similar to...

  12. Available online at www.sciencedirect.com Journal of Power Sources 175 (2008) 419429

    E-print Network

    Simões, Marcelo Godoy

    2008-01-01

    Available online at www.sciencedirect.com Journal of Power Sources 175 (2008) 419­429 On-line fault; received in revised form 2 September 2007; accepted 3 September 2007 Available online 14 September 2007 of the process. The fault diagnosis is based on the on-line monitoring of variables easy to measure

  13. SDSU General Catalog 2012-2013 175 Child and Family Development

    E-print Network

    Gallo, Linda C.

    childhood mental health. Majors may also continue graduate work in related fields such as marriage childhood education. The child development minor is an important adjunct for students in areasSDSU General Catalog 2012-2013 175 CFD Child and Family Development In the College of Education

  14. Program 2013 Date Regular Fee Early Bird Registra on Dates Winter SEEDS Feb 2022 $175 $165 Jan 115, 2013

    E-print Network

    Graham, Nick

    Program 2013 Date Regular Fee Early Bird Registra on Dates Winter SEEDS Feb 2022 $175 $165 Jan 115, 2013 Spring SEEDS May 13 $175 $165 March 115, 2013 2013 SEEDS Commuter Program The SEEDS program is designed to give highly mo vated, above average, and gi ed grade 7 & 8 students

  15. High Intensity Mirror-Free Nanosecond Ytterbium Fiber Laser System in Master Oscillator Power Amplification

    NASA Astrophysics Data System (ADS)

    Chun-Lin, Louis Chang

    Rare-earth-doped fiber lasers and amplifiers are relatively easy to efficiently produce a stable and high quality laser beam in a compact, robust, and alignment-free configuration. Recently, high power fiber laser systems have facilitated wide spread applications in academics, industries, and militaries in replacement of bulk solid-state laser systems. The master oscillator power amplifier (MOPA) composed of a highly-controlled seed, high-gain preamplifiers, and high-efficiency power amplifiers are typically utilized to scale up the pulse energy, peak power, or average power. Furthermore, a direct-current-modulated nanosecond diode laser in single transverse mode can simply provide a compact and highly-controlled seed to result in the flexible output parameters, such as repetition rate, pulse duration, and even temporal pulse shape. However, when scaling up the peak power for high intensity applications, such a versatile diode-seeded nanosecond MOPA laser system using rare-earth-doped fibers is unable to completely save its own advantages compared to bulk laser systems. Without a strong seeding among the amplifiers, the guided amplified spontaneous amplification is easy to become dominant during the amplification, leading to the harmful self-lasing or pulsing effects, and the difficulty of the quantitative numerical comparison. In this dissertation, we study a high-efficiency and intense nanosecond ytterbium fiber MOPA system with good beam quality and stability for high intensity applications. The all-PM-fiber structure is achieved with the output extinction ratio of >12 dB by optimizing the interconnection of high power optical fibers. The diode-seeded MOPA configuration without parasitic stimulated amplification (PAS) is implemented using the double-pass scheme to extract energy efficiently for scaling peak power. The broadband PAS was studied experimentally, which matches well with our numerical simulation. The 1064-nm nanosecond seed was a direct-current-modulated Fabry-Perot diode laser associated with a weak and pulsed noise spanning from 1045 to 1063 nm. Even though the contribution of input noise pulse is only <5%, it becomes a significant transient spike during amplification. The blue-shifted pulsed noise may be caused by band filling effect for quantum-well seed laser driven by high peak current. The study helps the development of adaptive pulse shaping for scaling peak power or energy at high efficiency. On the other hand, the broadband spike with a 3-dB bandwidth of 8.8 nm can support pulses to seed the amplifier for sub-nanosecond giant pulse generation. Because of the very weak seed laser, the design of high-gain preamplifier becomes critical. The utilization of single-mode core-pumped fiber preamplifier can not only improve the mode contrast without fiber coiling effect but also significantly suppress the fiber nonlinearity. The double-pass scheme was therefore studied both numerically and experimentally to improve energy extraction efficiency for the lack of attainable seed and core-pumped power. As a result, a record-high peak power of > 30 kW and energy of > 0.23 mJ was successfully achieved to the best of our knowledge from the output of clad-pumped power amplifier with a beam quality of M2 ˜1.1 in a diode-seeded 15-microm-core fiber MOPA system. After the power amplifier, the MOPA conversion efficiency can be dramatically improved to >56% for an energy gain of >63 dB at a moderate repetition rate of 20 kHz with a beam quality of M 2 <1.5. The output energy of >1.1 mJ with a pulse duration of ˜6.1 ns can result in a peak power up to >116 kW which is limited by fiber fuse in long-term operation. Such a condition able to generate the on-target laser intensity of > 60 GW/cm2 for applications is qualified to preliminarily create a laser-plasma light source. Moreover, the related simulation results also reveal the double-passed power amplifier can further simplify MOPA. Such an intense clad-pumped power amplifier can further become a nonlinear fiber amplifier in al

  16. In situ dissolution or deposition of Ytterbium (Yb) metal in microhotplate wells for a miniaturized atomic clock.

    PubMed

    Manginell, Ronald P; Moorman, Matthew W; Anderson, John M; Burns, George R; Achyuthan, Komandoor E; Wheeler, David R; Schwindt, Peter D D

    2012-10-22

    Current atomic clocks are burdened by size, weight, power and portability limitations to satisfy a broad range of potential applications. One critical need in the fabrication of a miniaturized atomic clock is small, low-power metallic sources. Exploiting the relatively high vapor pressure of ytterbium (Yb) and its dissolution in anhydrous ammonia, we report two independent techniques for depositing Yb inside a well micromachined into a microhotplate. Subsequent in situ evaporation of Yb from the microhotplate well serves as a low-power metallic source suitable for atomic clocks. The deposition and evaporation of Yb were confirmed using a variety of physicochemical techniques including quartz crystal microbalance, scanning electron microscopy, energy dispersive X-ray spectroscopy, and laser fluorescence. We also describe the fabrication of the microhotplate device, an integral component of our Yb-based miniature atomic clock. The Yb deposition/evaporation on a microhotplate well is thus useful as a low power Yb source during the fabrication of a miniaturized atomic clock, and this technique could be used for other applications requiring a vapor of a metal that has a moderate vapor pressure. PMID:23187228

  17. Generation of wide color gamut visible light in NIR-excited thulium-holmium-ytterbium codoped tantalum oxide nanopowders

    NASA Astrophysics Data System (ADS)

    Gouveia-Neto, Artur S.; Bueno, Luciano A.; Costa, Ernande B.; Silva, Elias A., Jr.; Ferrari, Jefferson L.; Lima, Karmel O.; Gonçalves, Rogéria R.

    2010-02-01

    Multicolor visible light emitting NIR-excited Tm/Ho/Yb-codoped tantalum oxide nanopowders were produced using the sol-gel method. The generation of wide color gamut fluorescence in glass-ceramic with orthorhombic Ta2O5 nanocrystals dispersed into amorphous silica-based matrix is observed. The light emission spectroscopic properties of the rare-earth doped SiO2:Ta2O5 nanocomposites as a function of the tantalum content and temperature of annealing is examined. Simultaneously emitted multicolor fluorescence consisting of blue(480 nm), green(540 nm) and red(650 nm) upconversion signals in the SiO2:Ta2O5 system doped with holmium and thulium and sensitized with ytterbium, is demonstrated. It is also demonstrated that the proper choice of the rare-earth content and the NIR excitation power yielded the generation and control of the three primary colors and allows the emission of a balanced white overall luminescence from the glass-ceramic nanopowder samples.

  18. Sensitivity of stratospheric composition to oxygen absorption of solar radiation (175–210 nm)

    Microsoft Academic Search

    R. Toumi; S. Bekki

    1994-01-01

    We have used a two dimensional radiative-chemical-transport model of the stratosphere to investigate the sensitivity of trace gas distributions to absorption of oxygen in the wavelength region 175–210 nm. Two different formulations for the Herzberg continuum absorption cross sections are used. The calculated transmission of ultra-violet light in the stratosphere is lower and higher than observed, depending on the choice

  19. From it's position at 175 statute miles above Earth, the Space Shuttle Endeavour has encountered

    NASA Technical Reports Server (NTRS)

    1996-01-01

    STS-77 ESC VIEW --- From it's position at 175 statute miles above Earth, the Space Shuttle Endeavour has encountered some colorful and attractive scenes heading into sunsets and sunrises. This particular encounter, captured with an Electronic Still Camera (ESC), occurred on flight day four, during which the six-member crew deployed the Passive Aerodynamically Stabilized Magnetically Damped Satellite (PAMS) - Satellite Test Unit (STU). GMT: 13:48:47.

  20. Effects of prolonged exposure to space flight factors for 175 days on lettuce seeds

    NASA Astrophysics Data System (ADS)

    Nevzgodina, L. V.; Maximova, E. N.; Akatov, Yu. A.

    We have studied the effects of prolonged (up to 175 days) exposure of Lactuca sativa seeds to space flight factors, including primary cosmic radiation heavy ions. The data obtained evidence a significant fourfold increase ofs pontaneous mutagenesis in seeds both with regard to the total number of aberrant cells as well as the formation of single cells with multiple aberrations. Comparison of the present experiment with earlier works shows that the frequency of such aberrations increases with the duration of the flight.

  1. 17.5um thin Cu wire bonding for fragile low-K wafer technology

    Microsoft Academic Search

    Teo Chen; Kim Jude

    2010-01-01

    This paper describes the challenges of a 17.5um thin bare Cu wire bonding on aluminum bond pads for a fragile low-k wafer technology, on a BGA package. Previous evaluations have so far focused on 20um and 25um bare Cu wires as a suitable low cost replacement for Au wires. To improve performance, more fragile low-k wafer technology is being developed.

  2. Inhibitory humoral responses to the Plasmodium falciparum vaccine candidate EBA-175 are independent of the erythrocyte invasion pathway.

    PubMed

    Badiane, Aida S; Bei, Amy K; Ahouidi, Ambroise D; Patel, Saurabh D; Salinas, Nichole; Ndiaye, Daouda; Sarr, Ousmane; Ndir, Omar; Tolia, Niraj H; Mboup, Souleymane; Duraisingh, Manoj T

    2013-08-01

    Plasmodium falciparum utilizes multiple ligand-receptor interactions for invasion. The invasion ligand EBA-175 is being developed as a major blood-stage vaccine candidate. EBA-175 mediates parasite invasion of host erythrocytes in a sialic acid-dependent manner through its binding to the erythrocyte receptor glycophorin A. In this study, we addressed the ability of naturally acquired human antibodies against the EBA-175 RII erythrocyte-binding domain to inhibit parasite invasion of ex vivo isolates, in relationship to the sialic acid dependence of these parasites. We have determined the presence of antibodies to the EBA-175 RII domain by enzyme-linked immunosorbent assay (ELISA) in individuals from areas of Senegal where malaria is endemic with high and low transmission. Using affinity-purified human antibodies to the EBA-175 RII domain from pooled patient plasma, we have measured the invasion pathway as well as the invasion inhibition of clinical isolates from Senegalese patients in ex vivo assays. Our results suggest that naturally acquired anti-EBA-175 RII antibodies significantly inhibit invasion of Senegalese parasites and that these responses can be significantly enhanced through limiting other ligand-receptor interactions. However, the extent of this functional inhibition by EBA-175 antibodies is not associated with the sialic acid dependence of the parasite strain, suggesting that erythrocyte invasion pathway usage by parasite strains is not driven by antibodies targeting the EBA-175/glycophorin A interaction. This work has implications for vaccine design based on the RII domain of EBA-175 in the context of alternative invasion pathways. PMID:23761656

  3. A SEARCH FOR HERBIG-HARO OBJECTS IN NGC 7023 AND BARNARD 175

    SciTech Connect

    Rector, T. A. [Department of Physics and Astronomy, University of Alaska Anchorage, Anchorage, AK 99508 (United States); Schweiker, H., E-mail: rector@uaa.alaska.edu, E-mail: heidis@noao.edu [National Optical Astronomy Observatory, Tucson, AZ 85719 (United States)

    2013-02-01

    Wide-field optical imaging was obtained of the cluster and reflection nebula NGC 7023 and the Bok globule B175. We report the discovery of four new Herbig-Haro (HH) objects in NGC 7023, the first HH objects to be found in this region. They were first detected by their H{alpha} and [S II] emission but are also visible at 3.6 and 4.5 {mu}m in archival Spitzer observations of this field. These HH objects are part of at least two distinct outflows. Both outflows are aligned with embedded 'Class I' young stellar objects in a tight group on the western edge of the nebula. One of the outflows may have a projected distance of 0.75 pc, which is a notable length for an embedded source. No new HH objects were discovered in B175. However, we reclassify the knot HH450X, in B175, as a background galaxy. The discovery that HH 450X is not a shock front weakens the argument that HH 450 and SNR G110.3+11.3 are co-located and interacting.

  4. Experimental investigation of radiation effect on erbium-ytterbium co-doped fiber amplifier for space optical communication in low-dose radiation environment.

    PubMed

    Ma, Jing; Li, Mi; Tan, Liying; Zhou, Yanping; Yu, Siyuan; Ran, Qiwen

    2009-08-31

    High power erbium-ytterbium co-doped fiber amplifier (EYDFA) has been radiated to the dose of 50 krad at the dose rate of 40 rad/s. Some key parameters have been measured to investigate the radiation effect on the EYDFA for space optical communication. Considering the dose of 50 krad is big enough to the most of low-dose radiation environment, these experimental results will be a good reference for the low-dose inter-satellite optical communication designers. PMID:19724555

  5. L-band tunable multiwavelength fiber laser using an unpumped polarization maintaining an erbium-ytterbium double-clad fiber-loop mirror

    Microsoft Academic Search

    G. Sun; Y. Chung; D. S. Moon

    2008-01-01

    An L-band tunable multiwavelength source is newly proposed and demonstrated employing an unpumped polarization maintaining\\u000a an erbium-ytterbium codoped double-clad fiber (PM-EYDF) loop mirror in a semiconductor optical amplifier-based fiber-ring\\u000a laser. This is achieved by only adjusting the polarization controller in the loop mirror for the birefringence of the PM-EYDF,\\u000a which is polarization dependent, and which originates from the fact that

  6. Growth and spectroscopic properties of ytterbium-doped lanthanum calcium borate (Yb 3+:La 2CaB 10O 19) crystal

    Microsoft Academic Search

    Rui Guo; Yicheng Wu; Peizhen Fu; Fangli Jing

    2005-01-01

    A new ytterbium-doped lanthanum calcium borate crystal (Yb3+:La2CaB10O19, Yb:LCB) has been grown by the flux method. The spectroscopic properties have been investigated and the fundamental spectral parameters for Yb:LCB crystal have been calculated. Yb:LCB crystal has the strongest absorption at 976 nm with a full-width at half-maximum of 14 nm. The absorption and emission cross-sections are 1.16×10?20 and 3.51×10?20 cm2,

  7. 41 CFR 102-74.175 - Are Government-leased buildings required to conform with the policies in this subpart?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Are Government-leased buildings required to conform with the policies in this subpart? 102-74...102-74.175 Are Government-leased buildings required to conform with the policies in this subpart?...

  8. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration... NAVIGATION REGULATIONS § 207.175a Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use,...

  9. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration... NAVIGATION REGULATIONS § 207.175a Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use,...

  10. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration... NAVIGATION REGULATIONS § 207.175a Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use,...

  11. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration... NAVIGATION REGULATIONS § 207.175a Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use,...

  12. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration... NAVIGATION REGULATIONS § 207.175a Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use,...

  13. 20 CFR 411.175 - What if a continuing disability review is begun before my ticket is in use?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... Section 411.175 Employees' Benefits SOCIAL SECURITY ADMINISTRATION THE TICKET TO WORK AND SELF-SUFFICIENCY PROGRAM Suspension...VR agency acting as an EN under the Ticket to Work program, or you may still receive...

  14. 20 CFR 411.175 - What if a continuing disability review is begun before my ticket is in use?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... Section 411.175 Employees' Benefits SOCIAL SECURITY ADMINISTRATION THE TICKET TO WORK AND SELF-SUFFICIENCY PROGRAM Suspension...VR agency acting as an EN under the Ticket to Work program, or you may still receive...

  15. 20 CFR 411.175 - What if a continuing disability review is begun before my ticket is in use?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... Section 411.175 Employees' Benefits SOCIAL SECURITY ADMINISTRATION THE TICKET TO WORK AND SELF-SUFFICIENCY PROGRAM Suspension...VR agency acting as an EN under the Ticket to Work program, or you may still receive...

  16. 20 CFR 411.175 - What if a continuing disability review is begun before my ticket is in use?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... Section 411.175 Employees' Benefits SOCIAL SECURITY ADMINISTRATION THE TICKET TO WORK AND SELF-SUFFICIENCY PROGRAM Suspension...VR agency acting as an EN under the Ticket to Work program, or you may still receive...

  17. 20 CFR 402.175 - Fees for providing information and related services for non-program purposes.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    20 Employees' Benefits 2 2011-04-01 2011-04-01...Section 402.175 Employees' Benefits SOCIAL SECURITY ADMINISTRATION...employee's time includes fringe benefits and overhead costs such as rent and utilities. (b) Non-program...

  18. Characterization of mode-locking in an all-fiber, all normal dispersion ytterbium based fiber oscillator

    NASA Astrophysics Data System (ADS)

    Cserteg, András.; Sági, Veronika; Drozdy, András.; Varallyay, Zoltán.; Gajdátsy, Gábor

    2015-03-01

    An ytterbium based all fiber, all normal dispersion fiber oscillator with integrated SESAM can have several operation modes like mode-locked, Q-switched and noise-like. To know and to control the quality of the mode-locking is essential for the application of such laser oscillators, otherwise the whole laser setup can be damaged or the expected operation characteristics of the oscillator driven systems cannot be achieved. Usually the two-photon signal generated by the short pulses is used to indicate the mode locked operation, however such detection can be misleading in certain cases and not always able to predict the forthcoming degradation or vanishing of mode locking. The characterization method that we propose uses only the radio frequency spectrum of the oscillator output and can identify the different operation regimes of our laser setup. The optical spectra measured simultaneously with the RF signals proves the reliability of our method. With this kind of characterization stable mode locking can be initiated and maintained during the laser operation. The method combined with the ability to align the polarization states automatically in the laser cavity leads to the possibility to record a polarization map where the stability domains can be identified and classified. With such map the region where the mode locking is self starting and maintainable with minimal polarization alignment can be selected. The developed oscillator reported here with its compact setup and self alignment ability can be a reliable source with long term error free operation without the need of expensive monitoring tools.

  19. Near-IR luminescence and field-induced single molecule magnet of four salen-type ytterbium complexes.

    PubMed

    Liu, Tian-Qi; Yan, Peng-Fei; Luan, Fang; Li, Yu-Xin; Sun, Jing-Wen; Chen, Chuan; Yang, Fan; Chen, Han; Zou, Xiao-Yan; Li, Guang-Ming

    2015-01-01

    A series of rigid hexadentate salen-type (H2L) ytterbium complexes, namely, [Yb2L3(CH3OH)]·3CH3CN (1), [Yb2LL'L?(CH3OH)(H2O)2](ClO4)2·CH3OH·H2O (2), [Yb2L(OAc)4(CH3OH)2]·2CH3OH (3), and {[Yb2L(OAc)4]·3H2O}n (4) (H2L = N,N'-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine, HL' = 2-(2'-hydroxy-3'-methyloxy-phenyl)benzimidazole and HL" = 3-methoxysalicylaldehyde) have been synthesized by reactions of H2L with multifarious Yb(3+) salts. X-ray crystallographic analyses demonstrate that complex 1 is of a triple-decker sandwich-type Yb2L3 structure with a ratio of H2L/Yb = 3:2, 2 and 3 possess the unique Yb2 core with a ratio of H2L/Yb = 2:2 and 1:2, respectively, 4 exhibits one dimensional coordination polymers in which the polymeric structures are formed by acetate (OAc(-)) groups. All complexes 1-4 exhibit near-IR luminescence, which can be rationalized on the basis of the disparate structural effects. The magnetic analysis unveils that all complexes 1-4 are of field-induced single-molecule magnet behavior with the energy barriers (Ueff/kB) of 14.5, 2.0, 9.5, and 2.4 K at 3 kOe direct current fields, respectively. PMID:25495352

  20. A Roughness Study of Ytterbium-Doped Potassium Yttrium Tungstate (YB: KYW) Thin-Disk Femtosecond Ablated Dentin

    PubMed Central

    Liu, Jing; Chen, Hu; Ge, Wenqi; Wang, Yongbo; Sun, Yuchun; Wang, Yong; Lü, Peijun

    2014-01-01

    Introduction: The aim of this study was to evaluate the morphological changes and quantitatively assess the roughness of dentin after the ablation with a Ytterbium-Doped Potassium Yttrium Tungstate (YB: KYW) thin-disk femtosecond pulsed laser of different fluences, scanning speeds and scanning distances. Method: Twelve extracted human premolars were sectioned into crowns and roots along the cementum-enamel junction, and then the crowns were cut longitudinally into sheets about 1.5 mm thick with a cutting machine. The dentin samples were fixed on a stage at focus plane. The laser beam was irradiated onto the samples through a galvanometric scanning system, so rectangular movement could be achieved. After ablation, the samples were examined with a scanning electron microscope and laser three-dimensional profile measurement microscope for morphology and roughness study.With increasing laser fluence, dentin samples exhibited more melting and resolidification of dentin as well as debris-like structure and occluded parts of dentinal tubules. Results: When at the scanning speed of 2400mm/s and scanning distance of 24?m, the surface roughness of dentin ablated with femtosecond pulsed laser decreased significantly and varied between values of dentin surface roughness grinded with two kinds of diamond burs with different grits. When at the scanning speed of 1200mm/s and scanning distance of 12?m, the surface roughness decreased slightly, and the surface roughness of dentin ablated with femtosecond pulsed laser was almost equal to that grinded with a low grit diamond bur. Conclusion: This study showed that increased laser influence may lead to more collateral damage and lower dentin surface roughness, while scanning speed and scanning distance were also negatively correlated with surface roughness. Adequate parameters should be chosen to achieve therapeutic benefits, and different parameters can result in diverse ablation results. PMID:25606337

  1. Growth, spectroscopic properties and laser performance of Nd{sup 3+}-doped potassium ytterbium tungstate laser crystal

    SciTech Connect

    Zhang, Ying, E-mail: starsugar_zy@163.com [College of Materials Science and Engineering, Changchun University of Science and Technology, No. 7989 WeiXing Road, Jilin Province, Changchun 130022 (China)] [College of Materials Science and Engineering, Changchun University of Science and Technology, No. 7989 WeiXing Road, Jilin Province, Changchun 130022 (China); Zeng, Fanming; Lin, Hai; Li, Chun; Qin, Jieming; Zhang, Xuejian; Wang, Chengwei; Liu, Jinghe [College of Materials Science and Engineering, Changchun University of Science and Technology, No. 7989 WeiXing Road, Jilin Province, Changchun 130022 (China)] [College of Materials Science and Engineering, Changchun University of Science and Technology, No. 7989 WeiXing Road, Jilin Province, Changchun 130022 (China)

    2010-08-15

    The 5 at.% Nd{sup 3+}-doped potassium ytterbium tungstate (Nd{sup 3+}:KYb(WO{sub 4}){sub 2}, hereafter Nd:KYbW) laser crystal with the dimension up to 28 mm x 15 mm x 12 mm was grown by the top seeded solution growth (TSSG) method. The infrared spectrum of crystal sample was measured, and the vibrational peaks were assigned. According to the absorption and emission spectra of crystal sample, the absorption and emission cross-sections are 16.03 x 10{sup -20} cm{sup 2} at 808 nm and 10.72 x 10{sup -20} cm{sup 2} at 1067 nm, respectively. The fluorescence life of {sup 4}F{sub 3/2} energy level is 196.33 {mu}s, and the fluorescence branching ratio for the {sup 4}F{sub 3/2}-{sup 4}I{sub 11/2} transition at 1067 nm is 55.74%. The energy transfer between Nd{sup 3+} and Yb{sup 3+} ions was observed from the fluorescence spectra pumped by 808 and 980 nm LD sources and the Stark levels of Yb{sup 3+} in Nd:KYbW crystal were determined. Highly efficient laser output up to 305 mW of Nd:KYbW crystal at 1067 nm has been achieved under pumping by a CW 808 nm laser diode at room temperature. The optical-optical conversion efficiency is 33.9% and the slope efficiency is 46.8%.

  2. New Radio Observations of Anomalous Microwave Emission in the H II Region RCW175

    NASA Astrophysics Data System (ADS)

    Battistelli, E. S.; Carretti, E.; Cruciani, A.; de Bernardis, P.; Génova-Santos, R.; Masi, S.; Naldi, A.; Paladini, R.; Piacentini, F.; Tibbs, C. T.; Verstraete, L.; Ysard, N.

    2015-03-01

    We have observed the H II region RCW175 with the 64 m Parkes telescope at 8.4 GHz and 13.5 GHz in total intensity, and at 21.5 GHz in both total intensity and polarization. High angular resolution ranging from 1 to 2.4 arcmin, high sensitivity, and polarization capability enable us to perform a detailed study of the different constituents of the H II region. For the first time, we resolve three distinct regions at microwave frequencies, two of which are part of the same annular diffuse structure. Our observations enable us to confirm the presence of anomalous microwave emission (AME) from RCW175. Fitting the integrated flux density across the entire region with the currently available spinning dust models, using physically motivated assumptions, indicates the presence of at least two spinning dust components: a warm component (T gas = 5800 K) with a relatively large hydrogen number density n H = 26.3/cm3 and a cold component (T gas = 100 K) with a hydrogen number density of n H = 150/cm3. The present study is an example highlighting the potential of using high angular-resolution microwave data to break model parameter degeneracies. Thanks to the spectral coverage and angular resolution of the Parkes observations, we have been able to derive one of the first AME/excess maps, at 13.5 GHz, showing clear evidence that the bulk of the anomalous emission arises in particular from one of the source components, with some additional contribution from the diffuse structure. A cross-correlation analysis with thermal dust emission has shown a high degree of correlation with one of the regions within RCW175. In the center of RCW175, we find an average polarized emission at 21.5 GHz of 2.2 ± 0.2(rand.) ± 0.3(sys.)% of the total emission, where we have included both systematic and statistical uncertainties at 68% CL. This polarized emission could be due to sub-dominant synchrotron emission from the region and is thus consistent with very faint or non-polarized emission associated with AME.

  3. NIR-to-NIR bioimaging DOI: 10.1002/anie.200((will be filled in by the editorial staff)) Ytterbium based Bioprobes for NIR-to-NIR Two Photon Scanning Laser Microscopy

    E-print Network

    Boyer, Edmond

    based Bioprobes for NIR-to-NIR Two Photon Scanning Laser Microscopy Imaging.[ **] Anthony D'Aléo, Adrien1 NIR-to-NIR bioimaging DOI: 10.1002/anie.200((will be filled in by the editorial staff)) Ytterbium for biological imaging, and more recently luminescence-based techniques have gained widespread utilization

  4. Lung clearance, translocation, and acute toxicity of arsenic, beryllium, cadmium, cobalt, lead, selenium, vanadium, and ytterbium oxides following deposition in rat lung

    SciTech Connect

    Rhoads, K.; Sanders, C.L.

    1985-04-01

    Young adult rats were exposed via inhalation or intratracheal instillation to oxides of arsenic, beryllium, cadmium, cobalt, lead, selenium, vanadium, and ytterbium. Serial necropsies were performed to assess the metal content in organs at times up to several weeks after exposure. The lung clearance varied widely for these compounds, and the times to remove 50% of the initial burden ranged from 18 min for vanadium to 400 days for beryllium. Arsenic, cadmium, lead, selenium, and vanadium were initially soluble in lung, but a small fraction (1-20%) remained there over the long term. Extrapulmonary tissues often accumulated substantial amounts of the soluble oxides, and whole-body retention was often greater for compounds that were more soluble in lung. Arsenic, selenium, and vanadium translocated to carcass and bone. Arsenic, cadmium, lead, and selenium accumulated in the liver, and the kidney retained cadmium and lead. Beryllium, cobalt and ytterbium did not deposit at any extrapulmonary site in significant amounts. In general, the aqueous solubility of these compounds was a poor predictor for behavior in vivo because of their interaction with metabolic processes. Of the metal oxides tested for acute lethality following pulmonary deposition, cadmium was most toxic, followed by selenium, vanadium, and arsenic.

  5. Size dependences in the adsorptive properties of the surface of ytterbium nanofilms deposited on silicon: The CO-Yb-Si(111)7 × 7 system

    NASA Astrophysics Data System (ADS)

    Kuz'min, M. V.; Loginov, M. V.; Mittsev, M. A.

    2009-04-01

    This paper reports on a study of the adsorption of CO molecules on the surface of ytterbium nanofilms of different thicknesses, which were sublimed on Si(111)7 × 7 at room temperature. Dependences of two types were investigated: the surface concentration of adsorbed molecules vs. CO dose expressed in langmuirs and the work function of films vs. CO dose. It was shown that the behavior of these dependences is mediated by size effects and Friedel oscillations generated by the ytterbium-silicon interface. Both effects exert an influence on the binding of CO molecules to the surface. At low molecule concentrations, this binding is effected through lone electron pairs localized at the carbon ends of the molecules. These electrons form a donor-acceptor bond to the vacant 5 d level of the metal, with the level dropping below the Fermi level. At high CO molecule concentrations, the pattern becomes more complex; indeed, the enhanced Coulomb interaction gives rise to a partial transfer of electrons from the 5 d level to the vacant 2?* orbital of CO molecules.

  6. Inhibition of Dexamethasone-induced Fatty Liver Development by Reducing miR-17-5p Levels.

    PubMed

    Du, William W; Liu, Fengqiong; Shan, Sze Wan; Ma, Xindi Cindy; Gupta, Shaan; Jin, Tianru; Spaner, David; Krylov, Sergey N; Zhang, Yaou; Ling, Wenhua; Yang, Burton B

    2015-07-01

    Steatosis is a pivotal event in the initiation and progression of nonalcoholic fatty liver disease (NAFLD) which can be driven by peroxisome proliferator-activated receptor-? (PPAR-?) dysregulation. Through examining the effect of PPAR-? on fatty liver development, we found that PPAR-? is a target of miR-17-5p. Transgenic mice expressing miR-17 developed fatty liver and produced higher levels of triglyceride and cholesterol but lower levels of PPAR-?. Ectopic expression of miR-17 enhanced cellular steatosis. Gain-of-function and loss-of-function experiments confirmed PPAR-? as a target of miR-17-5p. On the other hand, PPAR-? bound to the promoter of miR-17 and promoted its expression. The feed-back loop between miR-17-5p and PPAR-? played a key role in the induction of steatosis and fatty liver development. Mice with high levels of miR-17-5p were sensitive to Dexamethasone-induced fatty liver formation. Inhibition of miR-17-5p suppressed this process and enhanced PPAR-? expression in mice treated with Dexamethasone. Clofibrate, Ciprofibrate, and WY-14643: three agents used for treatment of metabolic disorders, were found to promote PPAR-? expression while decreasing miR-17-5p levels and inhibiting steatosis. Our studies show that miR-17-5p inhibitor and agents used in metabolic disorders may be applied in combination with Dexamethasone in the treatment of anti-inflammation, immunosuppression, and cancer patients. PMID:25896250

  7. Investigation of drum pressurization incident in the 331 Building, Room 175 on January 10, 1995

    SciTech Connect

    Pollari, R.A.

    1995-02-01

    On January 10, 1995, a pressurized drum incident occurred at the 331 Building, Room 175. On January 12, 1995, the Manager of the Life Sciences Center appointed members to an Investigation Board to investigate the incident (see Exhibit A). This incident was initially categorized as an Off-Normal Occurrence, but was later elevated to an Unusual Occurrence by the Occurrence Classifier. The scope of this investigation was to employ a formal method of root cause analysis, identify the methodology, and report the results of the analysis, fully explaining the technical elements of the causal sequence along with a description of the barriers that should have or could have prevented the occurrence. During the course of the investigation, the scene of the event was not accessible. Therefore, the investigation relied primarily on testimony from staff members directly involved and their management. In addition, other outside professionals were also consulted. The Investigation Board visited the previous location of the drum, 331A Building, Room 9; Room 173, which fronts room 175, was also visited. The Investigation Board reviewed selected documents, which are also listed.

  8. Evaluation of Hylife-II and Sombrero using 175- and 566- group neutron transport and activation cross sections

    SciTech Connect

    Cullen, D; Latkowski, J; Sanz, J

    1999-06-18

    Recent modifications to the TART Monte Carlo neutron and photon transport code enable calculation of 566-group neutron spectra. This expanded group structure represents a significant improvement over the 50- and 175-group structures that have been previously available. To support use of this new capability, neutron activation cross section libraries have been created in the 175- and 566-group structures starting from the FENDL/A-2.0 pointwise data. Neutron spectra have been calculated for the first walls of the HYLIFE-II and SOMBRERO inertial fusion energy power plant designs and have been used in subsequent neutron activation calculations. The results obtained using the two different group structures are compared to each other as well as to those obtained using a 175-group version of the EAF3.1 activation cross section library.

  9. (175)Yb-TTHMP as a good candidate for bone pain palliation and substitute of other radiopharmaceuticals.

    PubMed

    Safarzadeh, Laleh

    2014-07-01

    Bone metastasis is one of the most frequent causes of pain in cancer patients. Different radioisotopes such as P-32, Sm-153, Ho-166, Lu-177, and Re-186 with several chemical ligands as ethylenediaminetetramethylene phosphonic acid (EDTMP), 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetramethylene phosphonic acid (DOTMP), and propylenediaminetetramethylene phosphonate (PDTMP) are recommended for bone pain palliation. In this work, (175)Yb-triethylenetetraminehexamethylene phosphonic acid (TTHMP) was produced as a proper alternative to other radiopharmaceuticals. Relatively long half-life (T1/2 = 4.18 days), maximum energy beta particle E? =470 keV (86.5%), low abundance gamma emission 396 keV (6.4%), 286 keV (3.01%), 113.8 keV (1.88%) and low cost are considered advantageous of Yb-175 are to wider usage of this isotope; in addition, TTHMP is an ideal carrier moiety for bone metastases. Production, quality control, and biodistribution studies of (175)Yb-TTHMP were targeted. Yb-175 chloride was obtained by thermal neutron bombardment of a natural Yb2O3 sample at Tehran Research Reactor (TRR), radiolabeling was completed in 1 h by the addition of TTHMP at the room temperature and pH was 7.5-8, radiochemical purity was higher than 95%. Biodistribution studies in normal rats were carried out. The results showed favorable biodistribution features of (175)Yb-TTHMP, indicating significant accumulation in bone tissues compared with clinically used bone-seeking radiopharmaceuticals. This research presents (175)Yb-TTHMP can be a good candidate for bone pain palliation and substitute of other radiopharmaceuticals, however, further biological studies in other mammals are still needed. PMID:25210277

  10. 175Yb-TTHMP as a good candidate for bone pain palliation and substitute of other radiopharmaceuticals

    PubMed Central

    Safarzadeh, Laleh

    2014-01-01

    Bone metastasis is one of the most frequent causes of pain in cancer patients. Different radioisotopes such as P-32, Sm-153, Ho-166, Lu-177, and Re-186 with several chemical ligands as ethylenediaminetetramethylene phosphonic acid (EDTMP), 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetramethylene phosphonic acid (DOTMP), and propylenediaminetetramethylene phosphonate (PDTMP) are recommended for bone pain palliation. In this work, 175Yb-triethylenetetraminehexamethylene phosphonic acid (TTHMP) was produced as a proper alternative to other radiopharmaceuticals. Relatively long half-life (T1/2 = 4.18 days), maximum energy beta particle E? =470 keV (86.5%), low abundance gamma emission 396 keV (6.4%), 286 keV (3.01%), 113.8 keV (1.88%) and low cost are considered advantageous of Yb-175 are to wider usage of this isotope; in addition, TTHMP is an ideal carrier moiety for bone metastases. Production, quality control, and biodistribution studies of 175Yb-TTHMP were targeted. Yb-175 chloride was obtained by thermal neutron bombardment of a natural Yb2O3 sample at Tehran Research Reactor (TRR), radiolabeling was completed in 1 h by the addition of TTHMP at the room temperature and pH was 7.5-8, radiochemical purity was higher than 95%. Biodistribution studies in normal rats were carried out. The results showed favorable biodistribution features of 175Yb-TTHMP, indicating significant accumulation in bone tissues compared with clinically used bone-seeking radiopharmaceuticals. This research presents 175Yb-TTHMP can be a good candidate for bone pain palliation and substitute of other radiopharmaceuticals, however, further biological studies in other mammals are still needed. PMID:25210277

  11. Progressive myoclonus epilepsy EPM1 locus maps to a 175-kb interval in distal 21q

    SciTech Connect

    Virtaneva, K.; Miao, J.; Traeskelin, A.L.; Chapelle, A. de la; Lehesjoki, A.E. [Univ. of Helsinki (Finland)] [and others

    1996-06-01

    The EPM1 locus responsible for progressive myoclonus epilepsy of Unverricht-Lundborg type (MIM 254800) maps to a region in distal chromosome 21q where positional cloning has been hampered by the lack of physical and genetic mapping resolution. We here report the use of a recently constituted contig of cosmid, BAC, and P1 clones that allowed new polymorphic markers to be positioned. These were typed in 53 unrelated disease families from an isolated Finnish population in which a putative single ancestral EPM1 mutation has segregated for an estimated 100 generations. By thus exploiting historical recombinations in haplotype analysis, EPM1 could be assigned to the {approximately}175-kb interval between the markers D21S2040 and D21S1259. 26 refs., 2 figs., 4 tabs.

  12. New Family of Lanthanide-Based Complexes with Different Scorpionate-Type Ligands: A Rare Case Where Dysprosium and Ytterbium Analogues Display Single-Ion-Magnet Behavior.

    PubMed

    Lannes, Anthony; Luneau, Dominique

    2015-07-20

    A new family of lanthanide complexes [Ln(Tpz)2Bpz]·xCH2Cl2 (Ln = Gd, Tb, Dy, Ho, x = 0.5; Ln = Yb, x = 1; Tpz = hydrotris(pyrazolyl)borate; Bpz = dihydrobis(pyrazolyl)borate) has been synthesized. Those complexes have been characterized by single-crystal X-ray diffraction, and the magnetic properties have been investigated. Both dysprosium and ytterbium analogues display single-ion-magnet behavior, despite the difference in their spatial distribution of 4f electronic charges. Theoretical calculations with crystal field parameters have been carried out to gain better insight of the relaxation pathways that may be involved in those two complexes. PMID:26132295

  13. Growth and spectroscopic properties of ytterbium-doped lanthanum calcium borate (Yb 3+:La 2CaB 10O 19) crystal

    NASA Astrophysics Data System (ADS)

    Guo, Rui; Wu, Yicheng; Fu, Peizhen; Jing, Fangli

    2005-01-01

    A new ytterbium-doped lanthanum calcium borate crystal (Yb 3+:La 2CaB 10O 19, Yb:LCB) has been grown by the flux method. The spectroscopic properties have been investigated and the fundamental spectral parameters for Yb:LCB crystal have been calculated. Yb:LCB crystal has the strongest absorption at 976 nm with a full-width at half-maximum of 14 nm. The absorption and emission cross-sections are 1.16 × 10 -20 and 3.51 × 10 -20 cm 2, respectively. The fluorescence lifetime is 0.95 ms. The ground-state energy level splitting is calculated to be 640 cm -1. In comparison with other Yb-doped laser crystals, the calculated parameters show that Yb:LCB crystal satisfies the fundamental spectral condition for laser emission.

  14. A passively Q-switched ytterbium-doped fiber laser based on a few-layer Bi2Se3 saturable absorber

    NASA Astrophysics Data System (ADS)

    Ahmad, H.; Salim, M. A. M.; Azzuhri, Saaidal R.; Soltanian, M. R. K.; Harun, S. W.

    2015-06-01

    In this work, we demonstrate a simple Q-switched pulsed ring ytterbium-doped fiber laser based on a few-layer TI:Bi2Se3 saturable absorber (SA). Few-layer bismuth selenide within a suspension was induced onto a fiber ferrule at room temperature via an optical deposition method, resulting in a simple SA for the laser. Stable Q-switched pulsed lasing was achieved at a low pump threshold of 122.2?mW at 974?nm. The pulse repetition rate ranged from 18.97 to 45.41?kHz, and the narrowest pulse width and the maximum pulse energy were 13.1??s and 5.88?nJ respectively. Results indicated that TI:Bi2Se3 was also compatible with the 1??m waveband, and hence could be considered a potential broadband SA for passively mode-locked and Q-switched optical fiber lasers.

  15. Spectroscopy of f-f radiative transitions of Y b(³+) ions in ytterbium doped orthophosphates at ambient and high hydrostatic pressures.

    PubMed

    Kaminska, A; Duzynska, A; Suchocki, A; Bettinelli, M

    2010-06-01

    Studies of absorption and luminescence spectra, and luminescence decay times of the intrashell f-f transitions of Y b(³+) ions in bulk orthophosphates at different temperatures and at high hydrostatic pressures are presented. The spectroscopic properties of Y?.??Y b?.??PO? crystal with a tetragonal zircon structure and Gd?.??Y b?.??PO? and La?.??Y b?.??PO? crystals with a monoclinic monazite structure are compared. Experiments at ambient pressure were performed at temperatures from 10 to 295 K whereas measurements at high pressure were performed in a diamond-anvil cell at 10 K with a pressure up to 160 kbar. The results reveal a high thermal and pressure stability of the optical properties of the examined crystals as well as the dependence of Y b(³+) emission properties on the local symmetry of the site occupied by the ytterbium dopant. PMID:21393749

  16. 49 CFR 175.34 - Exceptions for cylinders of compressed oxygen or other oxidizing gases transported within the...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...transported within the State of Alaska. 175.34 Section...Relating to Transportation PIPELINE AND HAZARDOUS MATERIALS...transported within the State of Alaska. (a) Exceptions...transported in the State of Alaska, cylinders of compressed...by a ground-based or water-based mode of...

  17. 30 CFR 1206.175 - How do I determine quantities and qualities of production for computing royalties?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...THE INTERIOR Natural Resources Revenue...VALUATION Indian Gas § 1206.175...interest in the processing plant and...output of the processing plant is derived from gas obtained from...output of a processing plant is derived from gas obtained...

  18. Induction of Biologically Active Antibodies in Mice, Rabbits, and Monkeys by Plasmodium falciparum EBA175 Region II DNA Vaccine

    Microsoft Academic Search

    B. Kim Lee Sim; David L. Narum; Hong Liang; Steven R. Fuhrmann; Nicanor Obaldia III; Robert Gramzinski; Joao Aguiar; J. David Haynes; J. Kathleen Moch; Stephen L. Hoffman

    2001-01-01

    Background: Plasmodium falciparum merozoites bind to and invade human erythrocytes via specific erythrocyte recep- tors. This establishes the erythrocytic stage of the parasite life cycle that causes clinical disease resulting in 2-3 million deaths per year. We tested the hypothesis that a Plasmodium falciparum ligand, EBA-175 region II (RII), which binds its erythrocyte receptor glycophorin A during invasion, can be

  19. A time marker at 17.5 kyr BP detected throughout West Antarctica Robert W. JACOBEL, Brian C. WELCH

    E-print Network

    Jacobel, Robert W.

    A time marker at 17.5 kyr BP detected throughout West Antarctica Robert W. JACOBEL, Brian C. WELCH@stolaf.edu ABSTRACT. Deep radar soundings as part of the International Trans-Antarctic Scientific Expedition (US-ITASE) traverses in West Antarctica have revealed a bright internal reflector that we have imaged throughout

  20. Results of two LANL [beta]=0.175, 350-MHZ, 2-GAP spoke cavities

    SciTech Connect

    Tajima, T. (Tsuyoshi); Edwards, R. L. (Randall L.); Gentzlinger, R.C. (Robert C.); Krawczyk, F. L. (Frank L.); Ledford, J. E. (John E.); Liu, Jianfei; Montoya, D. I. (Debbie I.); Roybal, R. J. (Raymond J.(Ray); Schrage, D. L. (Dale L.); Shapiro, A. H. (Alan H.); Barni, D.; Bosotti, A.; Pagani, C. D.

    2003-01-01

    Two {beta} = 0.175, 350 MHz, 2-gap superconducting (SC) spoke cavities were fabricated in industry under the Advanced Accelerator Applications (AAA) project for the transmutation of nuclear waste. These cavities are promising candidates for the accelerating structures between a RFQ and the elliptical SC cavities for proton and heavy ion linacs. Since their delivery in July 2002, they have been tested in terms of mechanical properties, low-temperature performance, i.e., Qo-Eaccc urves at 4 K and 2 K, surface resistance dependence on temperature and for multipacting (MP). The two cavities achieved accelerating fields of 13.5 MV/m and 13.0 MV/m as compared to the required field of 7.5 MV/m with enough margin for the quality factor. These cavities seem to need more time to condition away MP than elliptical cavities, but MP does not occur once the cavity is conditioned and kept at 4 K. The length of the 103 mm-diameter nominal coupler port was found to be too short for the penetrating field.

  1. Properties of FIRBACK-ELAIS 175 um sources in the ELAIS N2 region

    E-print Network

    E. L. Taylor; R. G. Mann; A. N. Efstathiou; T. S. R. Babbedge; M. Rowan-Robinson; G. Lagache; A. Lawrence; S. Mei; M. Vaccari; Ph. Heraudeau; S. J. Oliver; M. Dennefeld; I. Perez-Fournon; S. Serjeant; E. Gonzalez-Solares; J. -L. Puget; H. Dole; C. Lari

    2005-06-13

    We report on a search for the optical counterparts of 175 um - selected sources from the Far-Infrared Background (FIRBACK) survey in the European Large Area ISO Survey (ELAIS) N2 field. Applying a likelihood ratio technique to optical catalogues from the Isaac Newton Telescope - Wide Field Survey (INT--WFS), we found optical identifications for 33 out of 55 FIRBACK sources in this field. These were then reassessed in the light of associations with the ELAIS final catalogue for the the N2 field, to yield a final set of 31 associations. We have investigated the nature of this population through a comparison of their observed spectral energy distributions with predictions from radiative transfer models which simulate the emission from both cirrus and starburst components. We find the far-infrared sources to be 80 per cent star bursting galaxies with their starburst component at a high optical depth. The resulting SEDs were used to estimate far-infrared luminosities, star formation rates, dust temperatures and dust masses. The N2 FIRBACK population is found to consist of four suspected ULIRGs, a number of LIRGs and a population of low redshift quiescently star forming galaxies. We also discuss the implications of these results for current evolutionary models.

  2. Intermetallic growth of wire-bond at 175°C high temperature aging

    NASA Astrophysics Data System (ADS)

    Chang, Hen-So; Pon, J. X.; Hsieh, Ker-Chang; Chen, C. C.

    2001-09-01

    Two types of samples were applied in this wire-bond evaluation work for an Al-pad diffusion process. One was finished product for the cross-section examination of wire-bond and the other was without compound encapsulant used for the plane view examination of wire-bond interface. These samples were aged at 175 C in air from 0 h to 1008 h. It is found that the normal product which was ready on board existed ˜1 ?m Au2Al and Au5Al2 phases. The Au2Al phase was then transformed to Au5Al2 phase in a 4 ˜ 72 h aging period. The Au4Al phase formed along with the Au5Al2 phase in 72 h to 240 h aging period showing some porosity within the reacted phases. The total phase thickness increased to ˜4?m after 240 h aging. The Au4Al phase became the major phase after 336 aging h. The reacted phase layer thickness increased to ˜6 ?m and reached the steady state. A titanium-rich thin layer was also induced within the reacted phase layer. Three ternary phases as AlAu2Ti, AlAuTi, and Al2Au2Ti are found in this titanium-rich layer. In particular, Al2Au2Ti could be a new phase.

  3. The peculiar binding properties of 4'-deoxy,4'-iododoxorubicin to isolated DNA and 175 bp nucleosomes.

    PubMed Central

    Cera, C; Palumbo, M

    1991-01-01

    The thermodynamic parameters governing the interaction of 4'-deoxy,4'-iododoxorubicin (4'-IAM) to double stranded DNA or 175 bp nucleosomes have been evaluated at different ionic strength and temperature conditions by means of fluorescence techniques. The iodo-anthracycline exhibits quite different characteristics from the parent compounds adriamycin (AM) and daunomycin (DM) and other second generation derivatives. In fact, the contribution of electrostatic interactions to the total free energy of binding is rather poor and the changes in enthalpy, usually high and negative, are low and eventually positive. Unlike other members of its family, 4'-IAM exhibits preference for the nucleosomal structure. In addition, its binding to isolated DNA is remarkably cooperative. Circular dichroism studies show changes in the geometry of the intercalation complex when the drug binds to nucleosomes. The possibility for the iodo-sugar moiety to act as an alkylating or free-radical producing species was also considered as an alternative mechanism of action. However, no evidence was obtained to support these hypotheses. Thus the major differences observed in DNA-binding in comparison to parent anthracyclines appear to be mostly related to the lower pKa and higher lipophilicity exhibited by 4'-IAM. PMID:1945847

  4. Oxidation of spent fuel in air at 175 degree to 195 degree C

    SciTech Connect

    Einziger, R.E.; Buchanan, H.C.; Thomas, L.E. (Pacific Northwest Lab., Richland, WA (United States)); Stout, R.B. (Lawrence Livermore National Lab., CA (United States))

    1992-04-01

    Oxidation tests in dry air were conducted on four LWR spent fuels at 175{degrees} and 195{degrees}C to determine the effect of the fuel characteristics on the oxidation state likely to exist at the time leaching occurs in a potential repository. Weight changes were measured and samples were examined by XRD, ceramography, TEM, and TGA. Despite local variations in the grain boundary susceptibility to oxidation, all four fuels progressed toward an apparent endpoint at an oxygen-to-metal (O/M) ratio of 2.4. The sole oxidation product was U{sub 4}O{sub 9+x,} a cubic phase structurally related to UO{sub 2} but with a slightly smaller lattice constant. The growth of the U{sub 4}O{sub 9+x} from the grain boundaries into the UO{sub 2} grains followed parabolic kinetics and had an activation energy of 26.6 kcal/mol. Based on the kinetics, the time required at 95{degrees}C to completely oxidize LWR spent fuel to U{sub 4}O{sub 9+x} would be at least 2000 yr. The next oxidation product to form after the U{sub 4}O{sub 9+x} phase may be U{sub 3}O{sub 8,} but no U{sub 3}O{sub 8} or other dilatational oxidation product has been detected in these accelerated tests conducted up to 25,000 h.

  5. Oxidation of spent fuel in air at 175{degree} to 195{degree}C

    SciTech Connect

    Einziger, R.E.; Buchanan, H.C.; Thomas, L.E. [Pacific Northwest Lab., Richland, WA (United States); Stout, R.B. [Lawrence Livermore National Lab., CA (United States)

    1992-04-01

    Oxidation tests in dry air were conducted on four LWR spent fuels at 175{degrees} and 195{degrees}C to determine the effect of the fuel characteristics on the oxidation state likely to exist at the time leaching occurs in a potential repository. Weight changes were measured and samples were examined by XRD, ceramography, TEM, and TGA. Despite local variations in the grain boundary susceptibility to oxidation, all four fuels progressed toward an apparent endpoint at an oxygen-to-metal (O/M) ratio of 2.4. The sole oxidation product was U{sub 4}O{sub 9+x,} a cubic phase structurally related to UO{sub 2} but with a slightly smaller lattice constant. The growth of the U{sub 4}O{sub 9+x} from the grain boundaries into the UO{sub 2} grains followed parabolic kinetics and had an activation energy of 26.6 kcal/mol. Based on the kinetics, the time required at 95{degrees}C to completely oxidize LWR spent fuel to U{sub 4}O{sub 9+x} would be at least 2000 yr. The next oxidation product to form after the U{sub 4}O{sub 9+x} phase may be U{sub 3}O{sub 8,} but no U{sub 3}O{sub 8} or other dilatational oxidation product has been detected in these accelerated tests conducted up to 25,000 h.

  6. High-pressure synthesis, crystal structure, and structural relationship of the first ytterbium fluoride borate Yb{sub 5}(BO{sub 3}){sub 2}F{sub 9}

    SciTech Connect

    Haberer, Almut [Institut fuer Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universitaet Innsbruck, Innrain 52a, A-6020 Innsbruck (Austria); Huppertz, Hubert, E-mail: hubert.huppertz@uibk.ac.a [Institut fuer Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universitaet Innsbruck, Innrain 52a, A-6020 Innsbruck (Austria)

    2009-04-15

    Yb{sub 5}(BO{sub 3}){sub 2}F{sub 9} was synthesized under high-pressure/high-temperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 1100 deg. C, representing the first known ytterbium fluoride borate. The compound exhibits isolated BO{sub 3}-groups next to ytterbium cations and fluoride anions, showing a structure closely related to the other known rare-earth fluoride borates RE{sub 3}(BO{sub 3}){sub 2}F{sub 3} (RE=Sm, Eu, Gd) and Gd{sub 2}(BO{sub 3})F{sub 3}. Monoclinic Yb{sub 5}(BO{sub 3}){sub 2}F{sub 9} crystallizes in space group C2/c with the lattice parameters a=2028.2(4) pm, b=602.5(2) pm, c=820.4(2) pm, and beta=100.63(3){sup o} (Z=4). Three different ytterbium cations can be identified in the crystal structure, each coordinated by nine fluoride and oxygen anions. None of the five crystallographically independent fluoride ions is coordinated by boron atoms, solely by trigonally-planar arranged ytterbium cations. In close proximity to the above mentioned compounds RE{sub 3}(BO{sub 3}){sub 2}F{sub 3} (RE=Sm, Eu, Gd) and Gd{sub 2}(BO{sub 3})F{sub 3}, Yb{sub 5}(BO{sub 3}){sub 2}F{sub 9} can be described via alternating layers with the formal compositions 'YbBO{sub 3}' and 'YbF{sub 3}' in the bc-plane. - Graphical abstract: High-pressure/high-temperature synthesis (multianvil technique) led to the first ytterbium fluoride borate Yb{sub 5}(BO{sub 3}){sub 2}F{sub 9}, built up from isolated BO{sub 3}-groups. The compound shows structural relations to the known rare-earth fluoride borates RE{sub 3}(BO{sub 3}){sub 2}F{sub 3} (RE=Sm, Eu, Gd) and Gd{sub 2}(BO{sub 3})F{sub 3}.

  7. Thermophysical properties of granular-fibrous material on the temperature interval from 175 to 450 K

    SciTech Connect

    Nurmukhamedov, K.S.; Salimov, Z.S.; Nigmadzhanov, S.K. [and others

    1992-06-01

    The use of both fluidization and hydrodynamically active high-temperature jets for drying granular-fibrous materials requires the determination of the thermophysical properties of the material being dried over a broad range of temperatures. The thermal conductivities, thermal diffusivities and specific heats of granular-fibrous materials have not been sufficiently studied. To a large extent, this is due to the complex multilayer structure of such materials, in particular cottonseed which consists of kernel, cortex and cotton fiber. The few published data mainly relate to the thermophysical properties of bulk cottonseed over a narrow temperature range T = 294-359 K. At the same time, the geometric dimensions and thermophysical properties of the layers differ sharply, and between the cortex and the kernel there is a layer of air (0.05-0.2){center_dot}10{sup -3} m thick. A feature of cottonseed is the fibrosity of the outer envelope, which varies from 0 to 35%, commercial seed processed in the oil-extracting industry having a fibrosity of between 4 and 12%. Therefore there is much interest in determining the thermophysical properties of cottonseed with different degrees of fibrosity. Below, we consider a method of calculating the effective thermal conductivity {lambda}{sub eff}, specific heat c{sub eff} and thermal diffusivity a{sub eff} of granular-fibrous material based on the experimental determination of the thermal conductivities and specific heats c of each of the layers, with reference to cottonseed having various fibrosities, moisture contents and temperatures. The effective thermal conductivity, specific and thermal diffusivity of cottonseed on the temperature interval 175-450 K are calculated for fibrosities and moisture contents varying from 0 to 35%. 17 refs., 3 tabs.

  8. A CANDIDATE DUAL ACTIVE GALACTIC NUCLEUS AT z = 1.175

    SciTech Connect

    Scott Barrows, R. [Arkansas Center for Space and Planetary Sciences, University of Arkansas, Fayetteville, AR 72701 (United States); Stern, Daniel; Assef, Roberto J.; Cushing, Michael C. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States); Madsen, Kristin; Harrison, Fiona [California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Comerford, Julia M. [Astronomy Department, University of Texas at Austin, Austin, TX 78712 (United States); Fassnacht, Christopher D.; Lagattuta, David J. [Department of Physics, University of California at Davis, One Shields Avenue, Davis, CA 95616 (United States); Gonzalez, Anthony H. [Department of Astronomy, University of Florida, Gainesville, FL 32611 (United States); Griffith, Roger; Davy Kirkpatrick, J. [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Hickox, Ryan, E-mail: rbarrows@uark.edu [Department of Physics, Durham University, Durham DHI 3LE (United Kingdom)

    2012-01-01

    The X-ray source CXOXBJ142607.6+353351 (CXOJ1426+35), which was identified in a 172 ks Chandra image in the Booetes field, shows double-peaked rest-frame optical/UV emission lines, separated by 0.''69 (5.5 kpc) in the spatial dimension and by 690 km s{sup -1} in the velocity dimension. The high excitation lines and emission line ratios indicate both systems are ionized by an active galactic nucleus (AGN) continuum, and the double-peaked profile resembles that of candidate dual AGNs. At a redshift of z = 1.175, this source is the highest redshift candidate dual AGN yet identified. However, many sources have similar emission line profiles for which other interpretations are favored. We have analyzed the substantial archival data available in this field as well as acquired near-infrared (NIR) adaptive optics (AO) imaging and NIR slit spectroscopy. The X-ray spectrum is hard, implying a column density of several 10{sup 23} cm{sup -2}. Though heavily obscured, the source is also one of the brightest in the field, with an absorption-corrected 2-10 keV luminosity of {approx}10{sup 45} erg s{sup -1}. Outflows driven by an accretion disk may produce the double-peaked lines if the central engine accretes near the Eddington limit. However, we may be seeing the narrow line regions of two AGNs following a galactic merger. While the AO image reveals only a single source, a second AGN would easily be obscured by the significant extinction inferred from the X-ray data. Understanding the physical processes producing the complex emission line profiles seen in CXOJ1426+35 and related sources is important for interpreting the growing population of dual AGN candidates.

  9. Sum-Frequency Generation of Femtosecond Pulses in CsLiB(6)O(10) Down to 175 nm.

    PubMed

    Petrov, V; Noack, F; Rotermund, F; Tanaka, M; Okada, Y

    2000-09-20

    Using a 150-mum-thick CsLiB(6)O(10) crystal, we produced 100-fs, >200-nJ light pulses tunable between 175 and 180 nm by sum-frequency generation at a 1-kHz repetition rate with an all-solid-state laser system mixing the fourth harmonic of a femtosecond Ti:sapphire regenerative amplifier and the idler pulse from a traveling-wave optical parametric amplifier. PMID:18350107

  10. JOURNAL DE PHYSIQUE Colloque CIO, supplment au n012, Tome 46, dcembre 1985 page C10-175

    E-print Network

    Paris-Sud XI, Université de

    JOURNAL DE PHYSIQUE Colloque CIO, supplément au n012, Tome 46, décembre 1985 page C10-175 INTERNAL, Columbia University, New York. NY 10027. U.S.A. Résumé - Le 20 kHz dans de Granato-L frottement i n t e r i ". Le frottement .ücke dans l ' é t a t aimanté ainsi que l e frottement suivant l a l o i de Rayleigh

  11. Phase diagram and some properties of Cu 2?x Se(2.01?2?x?1.75)

    Microsoft Academic Search

    A. Tonejc

    1980-01-01

    The temperatures of phase transformation from low-temperature a-phase to high-temperature ß-phase were measured for copper selenide Cu2-x Se in the composition range 2.01=2-x=1.75. The a-phase was found to be unstable in air, and further experiments should be performed in a good vacuum. The phase diagram of Cu2-x Se was redetermined by the X-ray parametric method and the possible reasons why

  12. Identification of a component of the sea urchin hyaline layer, HLC-175, which undergoes proteolytic processing during development

    Microsoft Academic Search

    John J. Robinson

    1995-01-01

    To define the role(s) played by the sea urchin extraembryonic matrix, the hyaline layer, we have previously purified and characterized a number of the protein components of this structure. We are currently studying the timing and significance of the proteolytic processing of these species. The localization of HLC-175 in the egg and 1-hr-old embryo was determined by indirect immunofluorescence analysis.

  13. A 1.75GHz highly integrated narrow-band CMOS transmitter with harmonic-rejection mixers

    Microsoft Academic Search

    Jeffrey A. Weldon; Jacques C. Rudell; Li Lin; R. Sekhar Narayanaswami; Masanori Otsuka; Sebastien Dedieu; Luns Tee; King-Chun Tsai; Cheol-Woong Lee; P. R. Gray

    2001-01-01

    Abstract, A highly integrated 1.75-GHz 0.35-m CMOS trans-mitter is described. The tates integration through the use of a unique mixer, termed a har-monic-rejection mixer, and a wide loop bandwidth phase-locked loop (PLL) for the RF synthesizer. The harmonic-rejection mixers are used to eliminate the need for a discrete IF filter and the use of a wide loop bandwidth PLL allowed

  14. Observation and Absolute Frequency Measurements of the {sup 1}S{sub 0}-{sup 3}P{sub 0} Optical Clock Transition in Neutral Ytterbium

    SciTech Connect

    Hoyt, C.W.; Barber, Z.W.; Oates, C.W.; Fortier, T.M.; Diddams, S.A.; Hollberg, L. [National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305 (United States)

    2005-08-19

    We report the direct excitation of the highly forbidden (6s{sup 2}){sup 1}S{sub 0}{r_reversible}(6s6p){sup 3}P{sub 0} optical transition in two odd isotopes of neutral ytterbium. As the excitation laser frequency is scanned, absorption is detected by monitoring the depletion from an atomic cloud at {approx}70 {mu}K in a magneto-optical trap. The measured frequency in {sup 171}Yb (F=1/2) is 518 295 836 591.6{+-}4.4 kHz. The measured frequency in {sup 173}Yb (F=5/2) is 518 294 576 847.6{+-}4.4 kHz. Measurements are made with a femtosecond-laser frequency comb calibrated by the National Institute of Standards and Technology cesium fountain clock and represent nearly a 10{sup 6}-fold reduction in uncertainty. The natural linewidth of these J=0 to J=0 transitions is calculated to be {approx}10 mHz, making them well suited to support a new generation of optical atomic clocks based on confinement in an optical lattice.

  15. Ytterbium-doped fiber laser passively mode locked by few-layer Molybdenum Disulfide (MoS2) saturable absorber functioned with evanescent field interaction

    PubMed Central

    Du, Juan; Wang, Qingkai; Jiang, Guobao; Xu, Changwen; Zhao, Chujun; Xiang, Yuanjiang; Chen, Yu; Wen, Shuangchun; Zhang, Han

    2014-01-01

    By coupling few-layer Molybdenum Disulfide (MoS2) with fiber-taper evanescent light field, a new type of MoS2 based nonlinear optical modulating element had been successfully fabricated as a two-dimensional layered saturable absorber with strong light-matter interaction. This MoS2-taper-fiber device is not only capable of passively mode-locking an all-normal-dispersion ytterbium-doped fiber laser and enduring high power laser excitation (up to 1?W), but also functions as a polarization sensitive optical modulating component (that is, different polarized light can induce different nonlinear optical response). Thanks to the combined advantages from the strong nonlinear optical response in MoS2 together with the sufficiently-long-range interaction between light and MoS2, this device allows for the generation of high power stable dissipative solitons at 1042.6?nm with pulse duration of 656?ps and a repetition rate of 6.74?MHz at a pump power of 210?mW. Our work may also constitute the first example of MoS2-enabled wave-guiding photonic device, and potentially give some new insights into two-dimensional layered materials related photonics. PMID:25213108

  16. Ytterbium-doped fiber laser passively mode locked by few-layer Molybdenum Disulfide (MoS2) saturable absorber functioned with evanescent field interaction

    NASA Astrophysics Data System (ADS)

    Du, Juan; Wang, Qingkai; Jiang, Guobao; Xu, Changwen; Zhao, Chujun; Xiang, Yuanjiang; Chen, Yu; Wen, Shuangchun; Zhang, Han

    2014-09-01

    By coupling few-layer Molybdenum Disulfide (MoS2) with fiber-taper evanescent light field, a new type of MoS2 based nonlinear optical modulating element had been successfully fabricated as a two-dimensional layered saturable absorber with strong light-matter interaction. This MoS2-taper-fiber device is not only capable of passively mode-locking an all-normal-dispersion ytterbium-doped fiber laser and enduring high power laser excitation (up to 1 W), but also functions as a polarization sensitive optical modulating component (that is, different polarized light can induce different nonlinear optical response). Thanks to the combined advantages from the strong nonlinear optical response in MoS2 together with the sufficiently-long-range interaction between light and MoS2, this device allows for the generation of high power stable dissipative solitons at 1042.6 nm with pulse duration of 656 ps and a repetition rate of 6.74 MHz at a pump power of 210 mW. Our work may also constitute the first example of MoS2-enabled wave-guiding photonic device, and potentially give some new insights into two-dimensional layered materials related photonics.

  17. Ytterbium-doped fiber laser passively mode locked by few-layer Molybdenum Disulfide (MoS2) saturable absorber functioned with evanescent field interaction.

    PubMed

    Du, Juan; Wang, Qingkai; Jiang, Guobao; Xu, Changwen; Zhao, Chujun; Xiang, Yuanjiang; Chen, Yu; Wen, Shuangchun; Zhang, Han

    2014-01-01

    By coupling few-layer Molybdenum Disulfide (MoS2) with fiber-taper evanescent light field, a new type of MoS2 based nonlinear optical modulating element had been successfully fabricated as a two-dimensional layered saturable absorber with strong light-matter interaction. This MoS2-taper-fiber device is not only capable of passively mode-locking an all-normal-dispersion ytterbium-doped fiber laser and enduring high power laser excitation (up to 1 W), but also functions as a polarization sensitive optical modulating component (that is, different polarized light can induce different nonlinear optical response). Thanks to the combined advantages from the strong nonlinear optical response in MoS2 together with the sufficiently-long-range interaction between light and MoS2, this device allows for the generation of high power stable dissipative solitons at 1042.6 nm with pulse duration of 656 ps and a repetition rate of 6.74 MHz at a pump power of 210 mW. Our work may also constitute the first example of MoS2-enabled wave-guiding photonic device, and potential y give some new insights into two-dimensional layered materials related photonics. PMID:25213108

  18. Spectra, temporal structure, and angular directivity of laser radiation of a Yb:YAG crystal and ytterbium glass pumped by low-coherence radiation from a F{sub 2}{sup +}:LiF colour centre laser

    SciTech Connect

    Bykovskii, N E; Senatsky, Yu V [P. N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

    2008-09-30

    By focusing radiation from a F{sub 2}{sup +}:LiF colour centre laser (emitting in the range from 0.89 to 0.95 {mu}m) on plates of a Yb:YAG crystal with the 20% concentration of Yb and of ytterbium glass with the 10% concentration of Yb, we observed nanosecond radiation pulses of Yb{sup 3+} ions in the spectral region from 1.00 to 1.06 {mu}m with the spectral width up to 20 nm in Yb:YAG and up to 50 nm in the ytterbium glass. Lasing appeared in the active medium in the region of excitation of the SBS of pump radiation with a diameter less than 200 {mu}m. The angular divergence of the broadband laser radiation (10{sup -3}-10{sup -4} rad) was one-two orders of magnitude smaller than the diffraction limit. The mechanism of generation of short broadband high-directional laser pulses in the spatial structure of thin layers with inversion produced in the region of propagation of an intense acoustic wave in the medium is discussed. The interpretation of experimental data on the angular divergence of radiation is based on a new concept of the spatial distribution of the electromagnetic field of a photon not in the form of a travelling wave but with the field structures located in fixed positions along the propagation direction. The features of the temporal picture and narrowband lasing spectra of Yb:YAG and ytterbium glass in a resonator upon relaxation of the SBS excitation region in the active medium are considered. The possibility of diagnostics of medium parameters using the shift of spectra of the lasing at the resonator modes in different sites of the SBS excitation region is discussed. (active media. lasers)

  19. Power Modulation Investigation for High Temperature (175-200 degrees Celcius) Automotive Application

    SciTech Connect

    McCluskey, F. P.

    2007-04-30

    Hybrid electric vehicles were re-introduced in the late 1990s after a century dominated by purely internal combustion powered engines[1]. Automotive players, such as GM, Ford, DaimlerChrysler, Honda, and Toyota, together with major energy producers, such as BPAmoco, were the major force in the development of hybrid electric vehicles. Most notable was the development by Toyota of its Prius, which was launched in Japan in 1997 and worldwide in 2001. The shift to hybrids was driven by the fact that the sheer volume of vehicles on the road had begun to tax the ability of the environment to withstand the pollution of the internal combustion engine and the ability of the fossil fuel industry to produce a sufficient amount of refined gasoline. In addition, the number of vehicles was anticipated to rise exponentially with the increasing affluence of China and India. Over the last fifteen years, major advances have been made in all the technologies essential to hybrid vehicle success, including batteries, motors, power control and conditioning electronics, regenerative braking, and power sources, including fuel cells. Current hybrid electric vehicles are gasoline internal combustion--electric motor hybrids. These hybrid electric vehicles range from micro-hybrids, where a stop/start system cuts the engine while the vehicle is stopped, and mild hybrids where the stop/start system is supplemented by regenerative braking and power assist, to full hybrids where the combustion motor is optimized for electric power production, and there is full electric drive and full regenerative braking. PSA Peugeot Citroen estimates the increased energy efficiency will range from 3-6% for the micro-hybrids to 15-25% for the full hybrids.[2] Gasoline-electric hybrids are preferred in US because they permit long distance travel with low emissions and high gasoline mileage, while still using the existing refueling infrastructure. One of the most critical areas in which technology has been advancing has been the development of electronics that can operate in the high temperature environments present in hybrid vehicles. The temperatures under the hood for a gasoline-electric hybrid vehicle are comparable to those for traditional internal combustion engines. This is known to be a difficult environment with respect to commercial-grade electronics, as there are surface and ambient temperatures ranging from 125 C to 175 C. In addition, some hybrid drive electronics are placed in even harsher environments, such as on or near the brakes, where temperatures can reach 250 C. Furthermore, number of temperature cycles experienced by electronics in a hybrid vehicle is different from that experienced in a traditional vehicle. A traditional internal combustion vehicle will have the engine running for longer periods, whereas a mild or micro-hybrid engine will experience many more starts and stops.[3] This means that hybrid automotive electronics will undergo more cycles of a potential wider temperature cycle than standard automotive electronics, which in turn see temperature cycles of 2 to 3 times the magnitude of the {Delta}T = 50 C-75 C experienced by commercial-grade electronics. This study will discuss the effects of these harsh environments on the failure mechanisms and ultimate reliability of electronic systems developed for gasoline-electric hybrid vehicles. In addition, it will suggest technologies and components that can reasonably be expected to perform well in these environments. Finally, it will suggest areas where further research is needed or desirable. Areas for further research will be highlighted in bold, italic type. It should be noted that the first area where further research is desirable is in developing a clearer understanding of the actual hybrid automotive electronics environment and how to simulate it through accelerated testing, thus: Developing specific mission profiles and accelerated testing protocols for the underhood environment for hybrid cars, as has previously been done for gasoline-powered vehicles, is an important area for further st

  20. Measurements of laser phase fluctuations induced by atmospheric turbulence over 2 km and 17.5 km distances.

    PubMed

    Ridley, Kevin D

    2011-09-10

    A laser heterodyne system was used to measure the phase fluctuations imposed on a 1.5??m wavelength laser beam when double-passed over long atmospheric paths. Two distances were used: 2 and 17.5?km. Results are given for intensity scintillation, phase fluctuation time series and spectra, and phase structure function. The results are found to agree well with theory: the spectrum of phase fluctuations follows the 8/3 power law predicted for Kolmogorov turbulence over 3 orders of magnitude in frequency. The methods reported here could be used to investigate large-scale temperature variations in the atmosphere. PMID:21946989

  1. Ferromagnetic microstructures in the ferromagnetic metallic phase of La0.825Sr0.175MnO3

    NASA Astrophysics Data System (ADS)

    Koyama, T.; Togawa, Y.; Takenaka, K.; Mori, S.

    2012-04-01

    Ferromagnetic (FM) microstructures in the FM metallic phase of La0.825Sr0.175MnO3 were examined by means of Lorentz transmission electron microscopy (Lorentz TEM) and small-angle electron diffraction (SAED). Microstructures of FM domains depend strongly on the crystal structures. The structural phase transition at 185 K accompanies with a drastic change of 180 degree FM domain structures from macroscopic wide domains to striped narrow domains. Lorentz TEM and SAED experiments revealed that a distribution of the magnetization in the striped FM domains is non-uniform and locally fluctuated.

  2. miR17-5p promotes human breast cancer cell migration and invasion through suppression of HBP1

    Microsoft Academic Search

    Hongling Li; Chunjing Bian; Lianming Liao; Jing Li; Robert Chunhua Zhao

    2011-01-01

    MicroRNAs have been implicated in regulating diverse cellular pathways. Emerging evidence indicate that the miR-17-92 cluster\\u000a may have a causal role in breast cancer tumorigenesis as a novel class of oncogenes, but the role of these miRNAs in breast\\u000a cancer invasion and migration remains unexplored. The aims of this study were to verify the effect of miR-17-5p (an important\\u000a member

  3. Polyethylene glycol compared with ytterbium oxide as a total faecal output marker to predict organic matter intake of dairy ewes fed indoors or at pasture.

    PubMed

    Hassoun, P; Bastianelli, D; Autran, P; Bocquier, F

    2014-09-01

    Several external markers can be used for estimating total faecal output in view of assessing ruminant intake at pasture. Among them, ytterbium (Yb) has been used for many years in various conditions. Polyethylene glycol (PEG) is a promising external marker because it can be rapidly determined using near-infrared spectroscopy (NIRS). The study consisted of 24 adult lactating dairy ewes over three periods (P1, P2 and P3), fed with three different diets: P1, total mixed ration (TMR); P2, Italian ryegrass (IRG); and P3, pasture. After an adaptation period, the ewes were administered a daily dose of ytterbium oxide (0.35 g/day) and PEG (20 g/day) for 2 weeks. During the last week, the daily organic matter intake (OMIOBS) was measured. Faecal samples were collected at milking time (0800 and 1600 h) to determine marker content, using only samples collected in the morning (PEGm) or by averaging samples (Yb, PEGma). Faecal marker content made it possible to assess total faecal output, either using the two recovery rates for PEG (0.98 or 0.87) or not. The OMIOBS was assessed on the basis of total faeces estimated with Yb (OMIYb) or PEG (OMIPEG), and the digestibility was calculated on the basis of feed analysis. With total TMR (P1), the OMIPEG, corrected with recovery rate (OMIPEGm98) or not corrected (OMIPEGm) was 2.40 kg/day and 2.50 kg/day, respectively, and was not different (P>0.05) from OMIOBS (2.51 kg/day), whereas OMIYb was lower (2.14 kg/day) (P<0.001). With IRG (P2), OMIPEGm98 (1.67 kg/day), OMIPEGm87 (1.51 kg/day) and OMIYb (1.59 kg/day) were not different (P>0.05) from OMIOBS (1.57 kg/day). With pasture (P3), the OMIPEGm (1.54 kg/day) and OMIPEGm98 (1.48 kg/day) were not different (P>0.05) from the OMI assessed from the biomass measurement (1.52 kg/day). The OMIYb (1.36 kg/day) was lower (P<0.05) but not different from OMIPEGm98 and OMIPEGm87. Spearman's rank correlation between OMIOBS and other OMIs (predicted with Yb or PEG P1 and P2) showed that it is possible to rank animals using PEG when there is a sufficiently wide range of OMIOBS (1.65 to 2.8 kg/day in P1) but not within a narrower range (1.47 to 1.72 kg/day in P2). In conclusion, the present study confirms that PEG is a valuable external faecal marker, easy to prepare (solution), administer and determine (NIRS). It can be used to assess intake with numerous animals at pasture, but only for groups, and not to quantitatively estimate individual OMI. PMID:24923355

  4. Functional requirement of dicer1 and miR-17-5p in reactive astrocyte proliferation after spinal cord injury in the mouse.

    PubMed

    Hong, Peiwei; Jiang, Mei; Li, Hedong

    2014-12-01

    Reactive astrogliosis after spinal cord injury (SCI) contributes to glial scar formation that impedes axonal regeneration. The mechanisms underlying reactive astrocyte proliferation upon injury remain partially understood. MicroRNAs (miRNAs) function as a major class of post-transcriptional gene expression regulators that participate in many biological processes. However, miRNA function during reactive astrogliosis, particularly in injury-induced astrocyte proliferation, has not been carefully examined. In this study, we conditionally deleted Dicer1 gene encoding an enzyme that is required for mature miRNA generation, and examined the proliferative behavior of Dicer1-null reactive astrocytes in the transected mouse spinal cord. We found that injury-induced proliferation is blocked in Dicer1-null astrocytes. Previous reports indicate that miR-17-5p family members are upregulated during SCI. We therefore tested functional contribution of miR-17-5p to the proliferation of reactive astrocytes in vitro. Our results showed that a synthetic miR-17-5p mimic is able to rescue the proliferation defect of Dicer1-null astrocytes, while an antisense inhibitor of miR-17-5p blocked lipopolysaccharide-induced astrocytic proliferation. Similar results are also observed in leukemia inhibitory factor (LIF)-treated astroglial cultures suggesting that miR-17-5p particularly modulates reactive astrocyte proliferation initiated by LIF presumably via the JAK/STAT3 pathway. Furthermore, overexpression of miR-17-5p leads to decrease of several cell cycle regulators in cultured astroglia and astrocytoma cell line C6. Our conclusion is that miRNAs are indispensable to the injury-induced reactive astrocyte proliferation, and that miR-17-5p may be a major player regulating this pathological process by affecting cell cycle machinery. PMID:25043492

  5. Wide Dispersion of ST175 Clone despite High Genetic Diversity of Carbapenem-Nonsusceptible Pseudomonas aeruginosa Clinical Strains in 16 Spanish Hospitals?

    PubMed Central

    García-Castillo, María; del Campo, Rosa; Morosini, María Isabel; Riera, Elena; Cabot, Gabriel; Willems, Rob; van Mansfeld, Rosa; Oliver, Antonio; Cantón, Rafael

    2011-01-01

    During the COMParative Activity of Carbapenems Testing (COMPACT) surveillance study, 448 Pseudomonas aeruginosa clinical isolates were obtained from 16 Spanish hospitals. Nonsusceptibility (EUCAST breakpoints) to imipenem (35%), meropenem (33%), and/or doripenem (33%) was observed with 175 isolates (39%). Simultaneous resistance to these three drugs was observed with 126 of the 175 isolates (72%). Except for colistin, high resistance rates were observed among noncarbapenem antibiotics. Clonal relatedness was investigated by pulsed-field gel electrophoresis (PFGE) with SpeI, discriminating 68 patterns. Multilocus sequence typing (MLST) was performed on 84 isolates representing different PFGE types and all participating hospitals. Thirty-nine sequence types (STs) could be distinguished, and of these, ST175 (48 isolates, 10 hospitals), ST646 (16 isolates, 4 hospitals), ST532 (13 isolates, 3 hospitals), and ST111 (13 isolates, 7 hospitals) were the most frequently encountered. Minimum-spanning tree analysis confirmed a wide dissemination of different clones among participant hospitals, particularly ST175. PFGE pattern comparison within the four most frequent STs revealed that ST175 isolates were relatively uniform, while ST646, ST532, and ST111 isolates were highly diverse, with almost every isolate belonging to a unique pulsotype, even when originating from the same center. The population of carbapenem-nonsusceptible P. aeruginosa isolates from 16 hospitals is highly diverse, with one ST (ST175) representing a highly conserved clone disseminated in 10 of the 16 participant hospitals. This ST175 clone should be added to the list of P. aeruginosa clones at high risk for epidemic spread, such as the Liverpool, Manchester, and Melbourne clones previously found in cystic fibrosis patients and ST235 in the nosocomial setting. PMID:21697331

  6. PC, a Novel Oral Insecticidal Toxin from Bacillus bombysepticus Involved in Host Lethality via APN and BtR-175.

    PubMed

    Lin, Ping; Cheng, Tingcai; Jin, Shengkai; Wu, Yuqian; Fu, Bohua; Long, Renwen; Zhao, Ping; Xia, Qingyou

    2015-01-01

    Insect pests have developed resistance to chemical insecticides, insecticidal toxins as bioinsecticides or genetic protection built into crops. Consequently, novel, orally active insecticidal toxins would be valuable biological alternatives for pest control. Here, we identified a novel insecticidal toxin, parasporal crystal toxin (PC), from Bacillus bombysepticus (Bb). PC shows oral pathogenic activity and lethality towards silkworms and Cry1Ac-resistant Helicoverpa armigera strains. In vitro assays, PC after activated by trypsin binds to BmAPN4 and BtR-175 by interacting with CR7 and CR12 fragments. Additionally, trypsin-activated PC demonstrates cytotoxicity against Sf9 cells expressing BmAPN4, revealing that BmAPN4 serves as a functional receptor that participates in Bb and PC pathogenicity. In vivo assay, knocking out BtR-175 increased the resistance of silkworms to PC. These data suggest that PC is the first protein with insecticidal activity identified in Bb that is capable of causing silkworm death via receptor interactions, representing an important advance in our understanding of the toxicity of Bb and the contributions of interactions between microbial pathogens and insects to disease pathology. Furthermore, the potency of PC as an insecticidal protein makes it a good candidate for inclusion in integrated agricultural pest management systems. PMID:26057951

  7. PC, a Novel Oral Insecticidal Toxin from Bacillus bombysepticus Involved in Host Lethality via APN and BtR-175

    PubMed Central

    Lin, Ping; Cheng, Tingcai; Jin, Shengkai; Wu, Yuqian; Fu, Bohua; Long, Renwen; Zhao, Ping; Xia, Qingyou

    2015-01-01

    Insect pests have developed resistance to chemical insecticides, insecticidal toxins as bioinsecticides or genetic protection built into crops. Consequently, novel, orally active insecticidal toxins would be valuable biological alternatives for pest control. Here, we identified a novel insecticidal toxin, parasporal crystal toxin (PC), from Bacillus bombysepticus (Bb). PC shows oral pathogenic activity and lethality towards silkworms and Cry1Ac-resistant Helicoverpa armigera strains. In vitro assays, PC after activated by trypsin binds to BmAPN4 and BtR-175 by interacting with CR7 and CR12 fragments. Additionally, trypsin-activated PC demonstrates cytotoxicity against Sf9 cells expressing BmAPN4, revealing that BmAPN4 serves as a functional receptor that participates in Bb and PC pathogenicity. In vivo assay, knocking out BtR-175 increased the resistance of silkworms to PC. These data suggest that PC is the first protein with insecticidal activity identified in Bb that is capable of causing silkworm death via receptor interactions, representing an important advance in our understanding of the toxicity of Bb and the contributions of interactions between microbial pathogens and insects to disease pathology. Furthermore, the potency of PC as an insecticidal protein makes it a good candidate for inclusion in integrated agricultural pest management systems. PMID:26057951

  8. Decreased Sensitivity to Changes in the Concentration of Metal Ions as the Basis for the Hyperactivity of DtxR(E175K)

    SciTech Connect

    D’ Aquino, J. Alejandro; Denninger, Andrew R.; Moulin, Aaron G.; D’ Aquino, Katharine E.; Ringe, Dagmar; (Harvard-Med); (Brandeis)

    2010-01-12

    The metal-ion-activated diphtheria toxin repressor (DtxR) is responsible for the regulation of virulence and other genes in Corynebacterium diphtheriae. A single point mutation in DtxR, DtxR(E175K), causes this mutant repressor to have a hyperactive phenotype. Mice infected with Mycobacterium tuberculosis transformed with plasmids carrying this mutant gene show reduced signs of the tuberculosis infection. Corynebacterial DtxR is able to complement mycobacterial IdeR and vice versa. To date, an explanation for the hyperactivity of DtxR(E175K) has remained elusive. In an attempt to address this issue, we have solved the first crystal structure of DtxR(E175K) and characterized this mutant using circular dichroism, isothermal titration calorimetry, and other biochemical techniques. The results show that although DtxR(E175K) and the wild type have similar secondary structures, DtxR(E175K) gains additional thermostability upon activation with metal ions, which may lead to this mutant requiring a lower concentration of metal ions to reach the same levels of thermostability as the wild-type protein. The E175K mutation causes binding site 1 to retain metal ion bound at all times, which can only be removed by incubation with an ion chelator. The crystal structure of DtxR(E175K) shows an empty binding site 2 without evidence of oxidation of Cys102. The association constant for this low-affinity binding site of DtxR(E175K) obtained from calorimetric titration with Ni(II) is K{sub a} = 7.6 {+-} 0.5 x 10{sup 4}, which is very similar to the reported value for the wild-type repressor, K{sub a} = 6.3 x 10{sup 4}. Both the wild type and DtxR(E175K) require the same amount of metal ion to produce a shift in the electrophoretic mobility shift assay, but unlike the wild type, DtxR(E175K) binding to its cognate DNA [tox promoter-operator (toxPO)] does not require metal-ion supplementation in the running buffer. In the timescale of these experiments, the Mn(II)-DtxR(E175K)-toxPO complex is insensitive to changes in the environmental cation concentrations. In addition to Mn(II), Ni(II), Co(II), Cd(II), and Zn(II) are able to sustain the hyperactive phenotype. These results demonstrate a prominent role of binding site 1 in the activation of DtxR and support the hypothesis that DtxR(E175K) attenuates the expression of virulence due to the decreased ability of the Me(II)-DtxR(E175K)-toxPO complex to dissociate at low concentrations of metal ions.

  9. Studies on the Q175 Knock-in Model of Huntington’s Disease Using Functional Imaging in Awake Mice: Evidence of Olfactory Dysfunction

    PubMed Central

    Ferris, Craig F.; Kulkarni, Praveen; Toddes, Steven; Yee, Jason; Kenkel, William; Nedelman, Mark

    2014-01-01

    Blood oxygen level dependent (BOLD) imaging in awake mice was used to identify differences in brain activity between wild-type, HETzQ175, and HOMzQ175 genotypes in response to the odor of almond. The study was designed to see how alterations in the huntingtin gene in a mouse model of Huntington’s disease would affect the perception and processing of almond odor, an evolutionarily conserved stimulus with high emotional and motivational valence. Moreover, the mice in this study were “odor naïve,” i.e., never having smelled almond or any nuts. Using a segmented, annotated MRI atlas of the mouse and computational analysis, 17 out of 116 brain regions were identified as responding differently to almond odor across genotypes. These regions included the glomerulus of the olfactory bulb, forebrain cortex, anterior cingulate, subiculum, and dentate gyrus of the hippocampus, and several areas of the hypothalamus. In many cases, these regions showed a gene-dose effect with HETzQ175 mice showing a reduction in brain activity from wild-type that is further reduced in HOMzQ175 mice. Conspicuously absent were any differences in brain activity in the caudate/putamen, thalamus, CA3, and CA1 of the hippocampus and much of the cortex. The glomerulus of the olfactory bulb in HOMzQ175 mice showed a reduced change in BOLD signal intensity in response to almond odor as compared to the other phenotypes suggesting a deficit in olfactory sensitivity. PMID:25071696

  10. Inverse magnetocaloric effect in Mn2NiGa and Mn1.75Ni1.25Ga magnetic shape memory alloys

    NASA Astrophysics Data System (ADS)

    Singh, Sanjay; Esakki Muthu, S.; Senyshyn, A.; Rajput, P.; Suard, E.; Arumugam, S.; Barman, S. R.

    2014-02-01

    Inverse magnetocaloric effect is demonstrated in Mn2NiGa and Mn1.75Ni1.25Ga magnetic shape memory alloys. The entropy change at the martensite transition is larger in Mn1.75Ni1.25Ga, and it increases linearly with magnetic field in both the specimens. Existence of inverse magnetocaloric effect is consistent with the observation that magnetization in the martensite phase is smaller than the austenite phase. Although the Mn content is smaller in Mn1.75Ni1.25Ga, from neutron diffraction, we show that the origin of inverse magnetocaloric effect is the antiferromagnetic interaction between the Mn atoms occupying inequivalent sites.

  11. Hickey -TT175, casts 220, line 222-229,231-232 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date/Time (MMDDYYHHMM) Total Scans

    E-print Network

    Hickey, Barbara

    Hickey -TT175, casts 220, line 222- 229,231-232 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date,220 #12;Hickey -TT175, casts 220, line 222- 229,231-232 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date #12;Hickey -TT175, casts 220, line 222- 229,231-232 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date

  12. Ho:YAG absorption cross sections from 1700 to 2200 nm at 83, 175, and 295 K.

    PubMed

    Brown, David C; Envid, Victoria; Zembek, Jason

    2012-12-01

    We have obtained absorption spectroscopic cross sections as a function of wavelength for the laser material Ho:YAG at 295, 175, and 83 K, in the spectral range from 1700 to 2200 nm. The absorption range corresponds to (5)I8-(5)I7 transitions from the ground state to the first excited state amenable to direct pumping by laser diodes and Tm fiber lasers. The data allow a direct comparison of the absorption cross-section intensities and linewidths as temperature is lowered from room temperature to cryogenic temperatures. Universal absorption curves and numerical tables are presented for pump sources that are assumed to have a gaussian spectral lineshape, as a function of center wavelength, bandwidth, and optical density (doping density×penetration depth), at 295 and 83 K. Curves and tables are presented for both 295 and 83 K and may be used to optimize the pump absorption and laser efficiency. PMID:23207384

  13. IDCS J1426.5+3508: DISCOVERY OF A MASSIVE, INFRARED-SELECTED GALAXY CLUSTER AT z = 1.75

    SciTech Connect

    Stanford, S. A.; Zeimann, Greg [Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States); Brodwin, M. [Department of Physics and Astronomy, University of Missouri, Kansas City, MO 64110 (United States); Gonzalez, Anthony H.; Mancone, C. [Department of Astronomy, University of Florida, Gainesville, FL 32611 (United States); Stern, Daniel; Eisenhardt, P. R. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Dey, Arjun [NOAO, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Snyder, Gregory F., E-mail: stanford@physics.ucdavis.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

    2012-07-10

    We report the discovery of an IR-selected massive galaxy cluster in the IRAC Deep Cluster Survey (IDCS). We present new data from the Hubble Space Telescope and the W. M. Keck Observatory that spectroscopically confirm IDCS J1426.5+3508 at z = 1.75. Moreover, the cluster is detected in archival Chandra data as an extended X-ray source, comprising 53 counts after the removal of point sources. We calculate an X-ray luminosity of L{sub 0.5-2keV} = (5.4 {+-} 1.2) Multiplication-Sign 10{sup 44} erg s{sup -1} within r = 60 arcsec ({approx}1 Mpc diameter), which implies M{sub 200,L{sub x}}= (5.3{+-}1.6) Multiplication-Sign 10{sup 14} M{sub Sun }. IDCS J1426.5+3508 appears to be an exceptionally massive cluster for its redshift.

  14. 175 MeV Au{sup +13} ion irradiation induced structural and morphological modifications in zinc oxide thin films

    SciTech Connect

    Singh, Devendra [Materials Science Research Laboratory, Department of Physics, S. V. College, Aligarh 202001, UP (India); Sharma, Aditya [Materials Science Research Laboratory, Department of Physics, S. V. College, Aligarh 202001, UP (India) and Department of Applied Sciences and Humanities, Krishna Institute of Engineering and Technology, Ghaziabad-201206, U.P. (India); Varshney, Mayora; Verma, K. D. [Materials Science Research Laboratory, Department of Physics, S. V. College, Aligarh 202001, UP (India) and Department of Applied Sciences and Humanities, Krishna Institute of Engineering and Technolog (India); Kumar, Shalendra [School of Nano and Advanced Materials Engineering, Changwon National University, 9 Sarim-dong, Changwon- 641-773 (Korea, Republic of)

    2013-02-05

    Thin films of ZnO were deposited, on Si substrates, using the RF-sputtering technique and irradiated by the 175 MeV Au{sup +13} beams. The structural changes were investigated by x-ray diffraction (XRD) measurements. The particle size found to increase with the increasing ion fluence up to 1 Multiplication-Sign 10{sup 12} ion/cm{sup 2}. At highest irradiation fluence of 5 Multiplication-Sign 10{sup 12} ion/cm{sup 2} the average particle size decreases. The Raman spectroscopy measurements were performed to understand the local phonon mode of the samples. The surface morphology of the as-deposited and irradiated thin films is measured by the Atomic Force Microscopy (AFM).

  15. Partial Revegetation of the Dust and Blowing-Sand Source Area: A proposal for use of a 175 K$ SEP Fine

    Microsoft Academic Search

    James M. Becker; Michael R. Sackschewsky

    2001-01-01

    We propose using the 175 K$ SEP money to stabilize approximately 300-340 acres located to the southwest of the 200 West Expansion Area fence. We propose a procedure that relies on drill seeding a mixture of perennial native grasses followed by truck application of a soil fixative such as Soil Master. This effort would compliment FDH\\/Duratek activities planned for inside

  16. Evaluated 473 SSR primer pairs designed from a variety of pine Identified 175 SSR markers as polymorphic in longleaf pine; 125

    E-print Network

    Summary Evaluated 473 SSR primer pairs designed from a variety of pine sequences Identified 175 SSR markers as polymorphic in longleaf pine; 125 are mapped in loblolly pine Identified 78 monomorphic SSR markers, some of which may be species-specific among the southern pines Next up... Select 24

  17. The Journal of Neuroscience. May 1991, 17(5): 1347-1359 Relation of Cortical Cell Orientation Selectivity to Alignment of

    E-print Network

    Stryker, Michael

    The Journal of Neuroscience. May 1991, 17(5): 1347-1359 Relation of Cortical Cell Orientation Selectivity to Alignment of Receptive Fields of the Geniculocortical Afferents that Arborize within a Single best to light-dark borders of particular orientations. The basis of cortical cell orientation

  18. 41 CFR 302-9.175 - When I am authorized to transport a POV, including a replacement POV, to my post of duty...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false When I am authorized to transport a POV, including a replacement POV...manufacturer or the manufacturer's agent transport a new POV from the factory or other shipping...302-9.175 When I am authorized to transport a POV, including a replacement...

  19. 41 CFR 302-9.175 - When I am authorized to transport a POV, including a replacement POV, to my post of duty...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2012-07-01 true When I am authorized to transport a POV, including a replacement POV...manufacturer or the manufacturer's agent transport a new POV from the factory or other shipping...302-9.175 When I am authorized to transport a POV, including a replacement...

  20. 41 CFR 302-9.175 - When I am authorized to transport a POV, including a replacement POV, to my post of duty...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false When I am authorized to transport a POV, including a replacement POV...manufacturer or the manufacturer's agent transport a new POV from the factory or other shipping...302-9.175 When I am authorized to transport a POV, including a replacement...

  1. 41 CFR 302-9.175 - When I am authorized to transport a POV, including a replacement POV, to my post of duty...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false When I am authorized to transport a POV, including a replacement POV...manufacturer or the manufacturer's agent transport a new POV from the factory or other shipping...302-9.175 When I am authorized to transport a POV, including a replacement...

  2. 41 CFR 302-9.175 - When I am authorized to transport a POV, including a replacement POV, to my post of duty...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false When I am authorized to transport a POV, including a replacement POV...manufacturer or the manufacturer's agent transport a new POV from the factory or other shipping...302-9.175 When I am authorized to transport a POV, including a replacement...

  3. Framework composed of interconnected quadruple-octahedra infinite chains: Synthesis and structure of calcium ytterbium sulfide, CaYb 2S 4, with the Yb 3S 4-type structure

    NASA Astrophysics Data System (ADS)

    Carpenter, James D.; Hwu, Shiou-Jyh

    1992-04-01

    Single crystals of the ternary calcium ytterbium compound, CaYb 2S 4, have been synthesized using an eutectic, halide flux and have been structurally characterized by the X-ray single-crystal diffraction method. The compound crystallizes in an orthorhombic unit cell, Pnma (No. 62), with cell dimensions of a = 12.807 (3) Å, b = 3.836 (2) Å, c = 12.964 (3) Å, V = 636.9 (7) Å 3, and Z = 4. The least-squares refinement of 658 observed reflections (with F20 > 3 ? ( F20)) gives a final structure solution of R = 0.026, Rw = 0.030, and GOF = 1.06 for 45 variables. This compound has adopted a Yb 3S 4-type structure in which the 7-coordinated divalent Yb 2+ sites are occupied by Ca 2+ cations. The refined occupancy factor on the calcium site suggests some nonstoichiometry, which is attributed to the solid solution of a ytterbium-rich phase. The crystal formula found is Ca 1- xYb 2+ xS 4 ( x = 0.04). The CaYb 2S 4 structure is a three-dimensional lattice which consists of interconnected quadruple-octahedra infinite chains. Each quadruple chain is built up from four edge-sharing octahedra that are composed of two pairs of asymmetric Yb(1)S 6 and Yb(2)S 6 groups. Structure comparison with another ternary rare-earth sulfide bearing a larger alkaline earth metal cation, BaSm 2S 4 (CaFe 2O 4-type), gives rise to some important insight for structure formation of rare-earth chalcogenide compounds.

  4. Degenerate Fermi gases of ytterbium.

    PubMed

    Fukuhara, Takeshi; Takasu, Yosuke; Kumakura, Mitsutaka; Takahashi, Yoshiro

    2007-01-19

    Evaporative cooling was performed to cool fermionic 173Yb atoms in a crossed optical dipole trap. The large elastic collision rate leads to efficient evaporation and we have successfully cooled the atoms to 0.37+/-0.06 of the Fermi temperature, that is to say, to a quantum degenerate regime. In this regime, a plunge of evaporation efficiency was observed as a result of Fermi degeneracy. PMID:17358662

  5. Pseudogene INTS6P1 regulates its cognate gene INTS6 through competitive binding of miR-17-5p in hepatocellular carcinoma

    PubMed Central

    Peng, Haoran; Ishida, Masaharu; Li, Ling; Saito, Atsushi; Kamiya, Atsushi; Hamilton, James P.; Fu, Rongdang; Olaru, Alexandru V.; An, Fangmei; Popescu, Irinel; Iacob, Razvan; Dima, Simona; Alexandrescu, Sorin T.; Grigorie, Razvan; Nastase, Anca; Berindan-Neagoe, Ioana; Tomuleasa, Ciprian; Graur, Florin; Zaharia, Florin; Torbenson, Michael S.; Mezey, Esteban; Lu, Minqiang; Selaru, Florin M.

    2015-01-01

    The complex regulation of tumor suppressive gene and its pseudogenes play key roles in the pathogenesis of hepatocellular cancer (HCC). However, the roles played by pseudogenes in the pathogenesis of HCC are still incompletely elucidated. This study identifies the putative tumor suppressor INTS6 and its pseudogene INTS6P1 in HCC through the whole genome microarray expression. Furthermore, the functional studies – include growth curves, cell death, migration assays and in vivo studies – verify the tumor suppressive roles of INTS6 and INTS6P1 in HCC. Finally, the mechanistic experiments indicate that INTS6 and INTS6P1 are reciprocally regulated through competition for oncomiR-17-5p. Taken together, these findings demonstrate INTS6P1 and INTS6 exert the tumor suppressive roles through competing for oncomiR-17-5p. Our investigation of this regulatory circuit reveals novel insights into the underlying mechanisms of hepatocarcinogenesis. PMID:25686840

  6. Treatment of Solitary Painful Osseous Metastases with Radiotherapy, Cryoablation or Combined Therapy: Propensity Matching Analysis in 175 Patients

    PubMed Central

    Zugaro, Luigi; Bonfili, Pierluigi; Gregori, Lorenzo; Franzese, Pietro; Marampon, Francesco; Vittorini, Francesca; Moro, Roberto; Tombolini, Vincenzo; Di Cesare, Ernesto; Masciocchi, Carlo

    2015-01-01

    Purpose aim of this study was to identify outcomes in pain relief and quality of life in patients with a solitary painful osseous metastasis treated by radiotherapy, cryoablation or the combination using a propensity score matching study design. Materials and Methods 175 patients with painful bone metastases were included in the study. Twenty-five of them underwent a radiation course (20 Gy in five daily fractions) 15 days after the cryoablation. These subjects were retrospectively matched by propensity analysis with a group of subjects treated by radiotherapy (125 subjects) and with a group treated byCryoablation (25 subjects). The pain relief in terms of complete response, rate of subjects requiring analgesics after treatments and the changes in self-rated quality of life were measured. Informed consent was obtained from the subject and the study was approved by the local Ethical Committee. Results An higher proportion of subjects treated by cryoablation (32%) or cryoablation followed by RT (72%;) experienced a complete response compared with patients treated by radiotherapy alone (11.2%). After Bonferroni correction strategy, the addition of radiotherapy to cryoablation significantly improved the rate of complete response compared with cryoablation alone (p = 0.011) and this paralleled with an improved self-rated quality of life. Seventeen subjects (13.6%) of patients in the radiotherapy group, 9 (36%) in the cryoablation group, and 19 (76)% in the cryoablation- radiotherapy group did not require narcotic medications. Conclusions The addition of radiotherapy to cryoablation favorably impacts on perceived pain, with a favorable toxicity profile. However, our data should be interpreted with caution and could serve as a framework around which to design future trials. PMID:26103516

  7. Traumatismes fermés et pénétrants de l'abdomen: analyse rétrospective sur 175 cas et revue de la littérature

    PubMed Central

    Fanomezantsoa, Raherinantenaina; Davidà, Rakotomena Solonirina; Tianarivelo, Rajaonarivony; Fabienne, Rabetsiahiny Lalao; Aina, Rajaonanahary Toky Mamin'Ny; Auberlin, Rakototiana Felantsoa; Allen, Hunald Francis; Nirina, Rakoto Ratsimba Hery

    2015-01-01

    Les traumatismes abdominaux sont relativement fréquents mais graves dans les pays en développement. Le but de cette étude était de décrire les aspects épidémiologiques, diagnostiques, thérapeutiques et évolutifs des contusions et plaies pénétrantes de l'abdomen prises en charge dans un pays à faibles ressources. Patients et méthodes: Il s'agissait d'une étude rétrospective et descriptive de 2 ans (2011-2012) ayant colligé 175 cas de traumatisés abdominaux au CHU-JRA Tananarive Madagascar. Parmi ces blessés (144 hommes et 31 femmes), il existait 122 vivants (69,7%) et 53 décès (30,3%) avant tout geste thérapeutique hospitalier. Les étiologies étaient dominées par les accidents à responsabilité civile (52,5%) et de la voie publique (38,5%). Les contusions et plaies pénétrantes représentaient respectivement 41,8% et 58,2%. Parmi les blessés vivants, 112 ont été opérés (91,8%). L’évolution hospitalière était favorable dans 94,3%. Quatre patients avaient des suites opératoires compliquées (3,6%). Sept patients étaient décédés (5,7%). Parmi les décès préhospitaliers, nous avons observé 73,6% de polytraumatisme (n = 39) et 26,4% de traumatismes abdominaux isolés (n = 14). A l'autopsie, les lésions abdominales étaient hémorragiques dans 94,3% incluant des plaies vasculaires rétropéritonéales, des ruptures hépatospléniques et des traumatismes graves du bassin. En situation précaire, les traumatismes abdominaux ont une mortalité préhospitalière assez importante. A l'hôpital, l’évolution était généralement favorable au prix d'un acte opératoire invasif. PMID:26097633

  8. Fine-structure mapping and functional analysis of temperature-sensitive mutants in the gene encoding the herpes simplex virus type 1 immediate early protein VP175.

    PubMed Central

    Dixon, R A; Schaffer, P A

    1980-01-01

    Herpes simplex virus (HSV)-specific proteins fall into at least three kinetic classes whose synthesis is sequentially and coordinaely regulated. Temperature-sensitive (ts) mutants of one complementation group (1-2) are defective in the transition from immediate early to early and late protein synthesis. To elucidate the function of the 1-2 gene product in the HSV type 1 replicative cycle, nine ts mutants in this group were mapped by fine-structure analysis and characterized members of the group lie within the terminally repeated sequences of the S region of the genome. Fine-structure genetic and physical mapping permitted the mutations to be ordered within these sequences. Because it has been shown that the message for VP175 and the DNA template specifying this protein extend beyond the limits of the physical map of the mutations, it follows that the mutations must lie within the structural gene for VP175. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis showed that most members of the group overproduced the immediate early proteins VP175, -136, -110, and -63 and markedly underproduced early and late proteins at the nonpermissive temperature. In temperature shiftup experiments, it was fund that the synthesis of early and late proteins ceased, whereas the synthesis of immediate early proteins began again. Thus, it is postulated that VP175 is (i) involved in the transition from immediate early to early protein synthesis, (ii) requird continuously to maintain early protein synthesis, (iii) autoregulated, acting to inhibit immediate early protein synthesis. Images PMID:6255206

  9. Repression of miR-17-5p with elevated expression of E2F-1 and c-MYC in non-metastatic hepatocellular carcinoma and enhancement of cell growth upon reversing this expression pattern

    SciTech Connect

    El Tayebi, H.M.; Omar, K.; Hegy, S.; El Maghrabi, M.; El Brolosy, M. [The Molecular Pathology Research Group, Department of Pharmacology and Toxicology, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo (Egypt)] [The Molecular Pathology Research Group, Department of Pharmacology and Toxicology, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo (Egypt); Hosny, K.A. [Department of General Surgery, Faculty of Medicine, Cairo University, Cairo (Egypt)] [Department of General Surgery, Faculty of Medicine, Cairo University, Cairo (Egypt); Esmat, G. [Department of Endemic Medicine and Hepatology, Cairo University, Cairo (Egypt)] [Department of Endemic Medicine and Hepatology, Cairo University, Cairo (Egypt); Abdelaziz, A.I., E-mail: ahmed.abdel-aziz@guc.edu.eg [The Molecular Pathology Research Group, Department of Pharmacology and Toxicology, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo (Egypt)

    2013-05-10

    Highlights: •The oncogenic miR-17-5p is downregulated in non-metastatic hepatocellular carcinoma patients. •E2F-1 and c-MYC transcripts are upregulated in non-metastatic HCC patients. •miR-17-5p forced overexpression inhibited E2F-1 and c-MYC expression in HuH-7 cells. •miR-17-5p mimicking increased HuH-7 cell growth, proliferation, migration and colony formation. •miR-17-5p is responsible for HCC progression among the c-MYC/E2F-1/miR-17-5p triad members. -- Abstract: E2F-1, c-MYC, and miR-17-5p is a triad of two regulatory loops: a negative and a positive loop, where c-MYC induces the expression of E2F-1 that induces the expression of miR-17-5p which in turn reverses the expression of E2F-1 to close the loop. In this study, we investigated this triad for the first time in hepatocellular carcinoma (HCC), where miR-17-5p showed a significant down-regulation in 23 non-metastatic HCC biopsies compared to 10 healthy tissues; however, E2F-1 and c-MYC transcripts were markedly elevated. Forced over-expression of miR-17-5p in HuH-7 cells resulted in enhanced cell proliferation, growth, migration and clonogenicity with concomitant inhibition of E2F-1 and c-MYC transcripts expressions, while antagomirs of miR-17-5p reversed these events. In conclusion, this study revealed a unique pattern of expression for miR-17-5p in non-metastatic HCC patients in contrast to metastatic HCC patients. In addition we show that miR-17-5p is the key player among the triad that tumor growth and spread.

  10. Structural, electrical and magnetic properties of Bi{sub 0.825}Pb{sub 0.175}FeO{sub 3}, and Bi{sub 0.725}La{sub 0.1}Pb{sub 0.175}FeO{sub 3} multiferroics

    SciTech Connect

    Varshney, Dinesh, E-mail: vdinesh33@rediffmail.com [Materials Science Laboratory, School of Physics, Devi Ahilya University, Khandwa Road Campus, Indore 452001 (India); Sharma, Poorva [Materials Science Laboratory, School of Physics, Devi Ahilya University, Khandwa Road Campus, Indore 452001 (India); Satapathy, S.; Gupta, P.K. [Laser Material Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452013 (India)

    2014-01-01

    Graphical abstract: - Highlights: • Samples synthesized by solid state reaction route successfully. • La and Pb substitutions significantly change the BiFeO{sub 3} crystal symmetry. • The presence of E(TO9) and E(LO9) modes indicates ferroelectric domain of BiFeO{sub 3}. • Doped ions and crystal structure affect the dielectric properties of the samples. • The observed value of conductivity for BPFO sample is 3.1 × 10{sup ?9} ?{sup ?1} cm{sup ?1}. - Abstract: Single-phase BiFeO{sub 3}, Bi{sub 0.825}Pb{sub 0.175}FeO{sub 3} and Bi{sub 0.725}La{sub 0.1}Pb{sub 0.175}FeO{sub 3} ceramic samples were prepared via solid state reaction route to study the effects of co-doping (La/Pb) on their crystal structure and ferroelectromagnetic behaviour. X-ray diffraction data accompanied by Rietveld refinement showed that BiFeO{sub 3} crystallize in rhombohedral distorted perovskite structure (space group-R3c) while to that BPFO and BLPFO crystallize in tetragonal (P4/mmm) symmetry. Presence of E(TO9) and E(LO9) modes in Raman scattering spectra for BiFeO{sub 3} and Bi{sub 0.725}La{sub 0.1}Pb{sub 0.175}FeO{sub 3} infers ferroelectric nature. However, absence of both modes in Bi{sub 0.875}Pb{sub 0.175}FeO{sub 3} indicates the paraelectric nature. The room temperature dielectric constant (10 Hz–1 MHz) of BiFeO{sub 3}, Bi{sub 0.825}Pb{sub 0.175}FeO{sub 3} and Bi{sub 0.725}La{sub 0.1}Pb{sub 0.175}FeO{sub 3} is about 100, 60, and 200. Ferroelectromagnetic measurements revealed the existence of ferroelectricity with remnant polarization of 0.24 ?C/cm{sup 2} in Bi{sub 0.725}La{sub 0.1}Pb{sub 0.175}FeO{sub 3}, paraelectricity in Bi{sub 0.875}Pb{sub 0.175}FeO{sub 3}, and weak (strong) ferromagnetism with remnant magnetizations of 0.25 (1.57) emu/g in Bi{sub 0.725}La{sub 0.1}Pb{sub 0.175}FeO{sub 3} (Bi{sub 0.825}Pb{sub 0.175}FeO{sub 3})

  11. Structure and conductivity of strontium-doped cerium orthovanadates Ce{sub 1-x}Sr{sub x}VO{sub 4} (0{<=}x{<=}0.175)

    SciTech Connect

    Petit, Christophe T.G.; Lan Rong; Cowin, Peter I. [Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Tao, Shanwen, E-mail: S.Tao@hw.ac.u [Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)

    2010-06-15

    A-site substituted cerium orthovanadates, Ce{sub 1-x}Sr{sub x}VO{sub 4}, were synthesised by solid-state reactions. It was found that the solid solution limit in Ce{sub 1-x}Sr{sub x}VO{sub 4} is at x=0.175. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I4{sub 1}/amd (1 4 1) with a=7.3670 (3) and c=6.4894 (1) A for Ce{sub 0.825}Sr{sub 0.175}VO{sub 4}. The UV-vis absorption spectra indicated that the compounds have band gaps at room temperature in the range 4.5-4.6 eV. Conductivity measurements were performed for the first time up to the strontium solid solution limit in air and in dry 5% H{sub 2}/Ar with conductivity values at 600 {sup o}C ranging from 0.3 to 30 mS cm{sup -1} in air to 30-45 mS cm{sup -1} in reduced atmosphere. Sample Ce{sub 0.825}Sr{sub 0.175}VO{sub 4} is redox stable at a temperature below 600 {sup o}C although the conductivity is not high enough to be used as an electrode for solid oxide fuel cells. - Graphical abstract: A-site substituted cerium orthovanadates Ce{sub 1-x}Sr{sub x}VO{sub 4} were synthesised by solid state reaction and their conductivities measured in air and dry 5% H{sub 2}/Ar up to the strontium solid solution limit.

  12. Electron transfer kinetics of self-assembled ferrocene (C12)Alkanethiol monolayers on gold electrodes from 125 K to 175 K

    Microsoft Academic Search

    John N. Richardson; Gary K. Rowe; Michael T. Carter; Leonard M. Tender; Larry S. Curtin; Stephen R. Peck; Royce W. Murray

    1995-01-01

    The electron transfer kinetics of monolayers of CpFeCpCO2(CH2)12SH and CH3(CH2)11SH co-chemisorbed on gold electrodes have been measured in 2: 1 (v: v) chloroethane\\/butyronitrile solvent at temperatures ranging from 125 K to 175 K with potential steps and cyclic voltammetry. Rate constants, ko, measured using cyclic voltammetry range from 3 × 10?4 to 10?1s?1 over these temperatures; an activation plot of

  13. Electron transfer kinetics of self-assembled ferrocene C(12) alkanethiol monolayers on gold electrodes from 125K to 175K

    Microsoft Academic Search

    John N. Richardson; Gary K. Rowe; Michael T. Carter; Leonard M. Tender; Larry S. Curtin

    1995-01-01

    The electron transfer kinetics of monolayers of CpFeCpCO2(CH2)12SH and CH3(Ch2)11SH co-chemisorbed on gold electrodes have been measured in 2:1 (v:v) chloroethane\\/butyronitrile solvent at temperatures ranging from 125K to 175K with potential steps and cyclic voltammetry. Rate constants, k deg, measured using cyclic voltammetry range from 3 x 10(exp -4) to 10(exp -1)\\/s over these temperatures; an activation plot of log

  14. The influence of 175 MeV Ni13+ ion and Co-60 gamma irradiation effects on subthreshold characteristics of N-channel depletion MOSFETs

    NASA Astrophysics Data System (ADS)

    Pushpa, N.; Praveen, K. C.; Prakash, A. P. Gnana; Naik, P. S.; Gupta, S. K.; Revannasiddaiah, D.

    2012-06-01

    N-channel depletion metal oxide semiconductor field effect transistors (MOSFETs) were irradiated with 175 MeV Ni3+ ions and Co-60 gamma radiation in the dose range of 100 krad to 100 Mrad. The I-V characteristics of MOSFETs were studied systematically before and after ion and gamma irradiation. The threshold voltage (VTH) of the irradiated MOSFETs was found to decrease with increase in ion and gamma dose. The more degradation was observed in the devices irradiated with Co-60 gamma radiation than irradiated with Ni13+ ions at given total doses.

  15. Megakaryocytic expression of miRNA 10a, 17-5p, 20a and 126 in Philadelphia chromosome-negative myeloproliferative neoplasm

    Microsoft Academic Search

    Kais Hussein; Wiebke Dralle; Katharina Theophile; Hans Kreipe; Oliver Bock

    2009-01-01

    Micro RNA (miRNA) are small non-coding RNA molecules which have a post-transcriptional inhibitory regulation function, e.g.\\u000a in megakaryopoiesis. A characteristic of Philadelphia chromosome-negative myeloproliferative neoplasm (Ph? MPN) is the abundance of morphologically aberrant megakaryocytes. Based on previously published in vitro megakaryocytic differentiation\\u000a assay data, we selected miRNA 10a, 17-5p, 20a and 126 and potential target proteins (HOXA1, RUNX1) for analysis

  16. Insertion d'oxygène dans les composés de type Cu0.5RTe2 et Cu0.5RTe1.75 (R = La et Nd)

    Microsoft Academic Search

    Marie-Paule Pardo; Marie-France Gardette; Nguyenhuy Dung; Jean Flahaut

    1991-01-01

    L'oxygène de l'air se fixe spontanément à la température ordinaire sur les composés Cu0.5RTe2 et Cu0.5RTe1.75 (R = La et Nd) de type structural Cu0.28LaTe2. Ce comportement se manifeste par une variation continue et relativement importante des paramètres cristallins (réseau orthorhombique, groupe Pbcm). Dans le cas du lanthane, les phases oxygénées obtenues sont diamagnétiques et ont un comportement semi-métallique alors

  17. Characterization of the PILATUS photon-counting pixel detector for X-ray energies from 1.75 keV to 60 keV

    NASA Astrophysics Data System (ADS)

    Donath, T.; Brandstetter, S.; Cibik, L.; Commichau, S.; Hofer, P.; Krumrey, M.; Lüthi, B.; Marggraf, S.; Müller, P.; Schneebeli, M.; Schulze-Briese, C.; Wernecke, J.

    2013-03-01

    The PILATUS detector module was characterized in the PTB laboratory at BESSY II comparing modules with 320 ?m thick and newly developed 450 ?m and 1000 ?m thick silicon sensors. Measurements were carried out over a wide energy range, in-vacuum from 1.75 keV to 8.8 keV and in air from 8 keV to 60 keV. The quantum efficiency (QE) was measured as a function of energy and the spatial resolution was measured at several photon energies both in terms of the modulation transfer function (MTF) from edge profile measurements and by directly measuring the point spread function (PSF) of a single pixel in a raster scan with a pinhole beam. Independent of the sensor thickness, the measured MTF and PSF come close to those for an ideal pixel detector with the pixel size of the PILATUS detector (172 × 172 ?m2). The measured QE follows the values predicted by calculation. Thicker sensors significantly enhance the QE of the PILATUS detectors for energies above 10 keV without impairing the spatial resolution and noise-free detection. In-vacuum operation of the PILATUS detector is possible at energies as low as 1.75 keV.

  18. Effect of Cr and Fe Substitution on the Transport Properties of the Nowotny Chimney-Ladder MnSi ? (1.73 < ? < 1.75) Compounds

    NASA Astrophysics Data System (ADS)

    Ponnambalam, V.; Morelli, Donald T.

    2012-06-01

    Manganese silicides MnSi ? (1.73 < ? < 1.75) have been substituted with substantial amounts of Cr (<25%) and Fe (<30%) at the Mn site to study the resistivity ( ?), Seebeck ( ?) and Hall coefficients, and thermal conductivity of the resulting compositions. Only marginal reduction in ? is observed upon substituting Cr to as much as 25%. Surprisingly, the Seebeck coefficient is positive even after substituting Fe to 20%. The Hall coefficients are positive, and the carrier concentrations seem to be less sensitive to substitution by either Cr or Fe. The promising aspect of this system is the low lattice thermal conductivity, which is approximately 2.5 W/m K at 300 K for most compositions.

  19. Effect of casing treatment of overall performance of axial-flow transonic fan stage with pressure ratio of 1.75 and tip solidity of 1.5

    NASA Technical Reports Server (NTRS)

    Osborn, W. M.; Moore, R. D.

    1977-01-01

    The effect of a number of casing treatments on the overall performance of a 1.75-pressure-ratio, 423-m/sec-tip-speed fan stage was evaluated. The skewed slot configuration with short-open slots over the midportion of the rotor had a stall margin of 23.5 percent, while the solid casing had a stall margin of 15.0 percent. The skewed slot configuration with long open slots extending ahead of and over portion of rotor displaced the stall line to the lowest flow at all speeds tested. At design speed, the peak efficiency for the long, forward open slots was 1 point less than that for the short midopen slots and 3 points less than that for the solid casing.

  20. X-ray structure at 1.75 resolution of a norovirus 3C protease linked to an active site-directed peptide inhibitor

    SciTech Connect

    Cooper, Jon [University of Southampton, England; Coates, Leighton [ORNL; Hussey, Robert [University of Southampton, England

    2010-01-01

    Noroviruses are recognized universally as the most important cause of human epidemic non-bacterial gastroenteritis. Viral replication requires a 3C cysteine protease that cleaves a 200kDa viral polyprotein into its constituent functional proteins. Here we describe the X-ray structure of the Southampton norovirus 3C protease (SV3CP) bound to an active site-directed peptide inhibitor (MAPI) which has been refined at 1.75 resolution, following initial MAD phasing with a selenomethionine derivative. The inhibitor, acetyl-Glu-Phe-Gln-Leu-Gln-X, based on a 3C protease cleavage recognition sequences in the 200kDa polyprotein substrate, reacts covalently through its propenylethylester group (X) with the active site nucleophile, Cys 139. The 3C protease-inhibitor structure permits, for the first time, the identification of substrate recognition and binding groups and provides important new information for the development of antiviral prophylactics.

  1. Partial Re-vegetation of the Dust and Blowing-Sand Source Area: A proposal for use of a 175 K$ SEP Fine

    SciTech Connect

    Becker, James M.; Sackschewsky, Michael R.

    2001-08-01

    We propose using the 175 K$ SEP money to stabilize approximately 300-340 acres located to the southwest of the 200 West Expansion Area fence. We propose a procedure that relies on drill seeding a mixture of perennial native grasses followed by truck application of a soil fixative such as Soil Master. This effort would compliment FDH/Duratek activities planned for inside the 200 West fence lines. Assuming that both efforts are successful, the result would be between 2,000 and 2,500 meters of stabilized soil surface upwind of the primary receptors at MO-281/272-WA, which would result in a significant reduction in respirable dust at the receptor site.

  2. Hole mobility enhancement of Cu-deficient Cu{sub 1.75}Zn(Sn{sub 1?x}Al{sub x})Se{sub 4} bulks

    SciTech Connect

    Kuo, Dong-Hau, E-mail: dhkuo@mail.ntust.edu.tw; Tsega, Moges

    2013-10-15

    Cu-deficient Cu{sub 1.75}ZnSn{sub 1?x}Al{sub x}Se{sub 4} (x=0–0.6) bulks were prepared by a liquid-phase reactive sintering method at 600 {sup °}C with soluble sintering aids of Sb{sub 2}S{sub 3} and Te. Defect chemistry was studied by measuring electrical properties of Al-doped CZTSe as a function of dopant concentration. Al-CZTSe pellets at x=0.4 with electrical conductivity of 57.2 S cm{sup ?1} showed the highest hole mobility of 32.5 cm{sup 2} V{sup ?1} s{sup ?1}. The high mobility is mainly contributed from the low atomic scattering factor of Al. The high carrier concentration and slightly changed lattice parameter of Al-CZTSe are related to the types of its defects. - Graphical abstract: The controls in electrical properties and the changes in lattice parameters of Cu-deficient Cu{sub 2}ZnSnSe{sub 4} by doping Al{sup 3+} on the Sn{sup 4+} site. Display Omitted - Highlights: • Cu-deficient Cu{sub 1.75}Zn(Sn{sub 1?x}Al{sub x})Se{sub 4} was prepared by liquid-phase sintering at 600 °C. • Sintering aids of Sb{sub 2}S{sub 3} and Te were used for reactive sintering. • Al-CZTSe at x=0.4 showed the extremely high mobility of 32.5 cm{sup 2} V{sup ?1} s{sup ?1}. • Al-CZTSe reached large grains of 2?3 ?m, while it was <1.0 ?m for the undoped. • Electrical properties of Al-CZTSe pellets changed with the Al content.

  3. Effects of 2.0-g 1.75-g and 1.5-g Hypergravity on Pregnancy Outcome in Rats (Rattus norvegicus)

    NASA Technical Reports Server (NTRS)

    Mills, Nicole A.; Baer, Lisa A.; Ronca, April E.

    2001-01-01

    In 1995, ten pregnant female rats were launched on the Space Shuttle (STS-70) on Gestational day(G) 11 of their 22-day pregnancy as part of the NASA/NIH.Rodent (R)2 Experiment. Following landing on G20, fetuses were harvested from half of the dams, while the remaining five dams underwent birth. Spaceflight did not interrupt pregnancy, alter litter sizes, or affect body weights or gender ratios of the fetuses or neonates. In the present study we used the NASA/NIH.R2 experimental paradigm to analyze the effects of hypergravity on pregnancy outcome. On G10, time-bred Sprague-Dawley rat dams were assigned to either G20 or Birth conditions, then further assigned to Hypergravity (HG) 2.0-g, HG 1.75-g, HG 1.5-g, Rotational Control (RC, 1.03), or Stationary Control (SC, 1.0-g) treatments. Dams were exposed to continuous centrifugation from G11 through G20, with brief daily stops for animal health checks and maintenance. For both the G20 and Birth dams, comparable litter sizes and litter gender ratios were observed across gravity conditions. However, centrifugation-exposed (HG and RC) fetuses and neonates showed significantly lower body masses (p less than 0.05) relative to SC offspring. HG 2.0-g offspring weighed significantly less than those in all other gravity conditions (p less than 0.05). The observed reductions in offspring body mass at 1.5-g and 1.75-g, can be attributed to the rotational component of centrifugation, rather than to increased gravitational load, whereas 2.0-g hypergravity exposure further exacerbated the gravity centrifugation effect on offspring body mass. Pregnant dams exposed to centrifugation weighed significantly less than SC dams (p less than 0.05), suggesting that centrifugation effects on maternal body mass may contribute to reduced size of the developing offspring. These findings are consistent with previous reports of non-pregnant adult animals suggesting that, whereas spaceflight has virtually no effect on body mass, centrifugation is associated with changes in body weight regulation.

  4. Structural and magnetic properties of nanocrystalline Nd 4.5Fe 72Co 2Cr 3Al 1B 17.5 ribbons

    NASA Astrophysics Data System (ADS)

    Pampillo, L. G.; Saccone, F. D.; Sirkin, H. R. M.

    2007-02-01

    In this work, it was made a study on structural and magnetic properties of nanocrystalline Nd 4.5Fe 72Co 2Cr 3Al 1B 17.5 ribbons obtained from crystallisation of amorphous precursors. A complex two-step crystallisation process, was found by differential scanning calorimetry (DSC): a first crystallisation peak at around T=570 °C exhibiting the precipitation of ?-Fe and t-Fe 3B phases and a diffusive stage ending in a second exothermic peak. Also, isothermal annealings of 10 min duration were performed at 605, 635, 650 and 685 °C. Hysteresis curves of isothermally annealed samples showed magnetic hardening, with coercive fields above 2 kOe and an optimised MR/ MS ratio of around 0.6. Except for the highest treatment temperature used in this work, the demagnetizing curves of annealed ribbons exhibited a step near zero field. This fact suggests a low exchange coupling between hard and soft phases, which can be attributed to the grain border phases. Otherwise, Mössbauer effect spectroscopy allowed us to determine that the absence of step in the demagnetizing curve of ribbons annealed at 685 °C, may be attributed to the formation of a ?-(Fe, Co) solid solution (with hyperfine parameters BHF=35.5 T and ?=-0.11 mm/s). The formation of this solid solution also explains the diffusive process in the second crystallisation stage observed by DSC experiment.

  5. A novel p.Glu175X premature stop mutation in the C-terminal end of HSP27 is a cause of CMT2.

    PubMed

    Rossor, Alexander M; Davidson, Gabrielle L; Blake, Julian; Polke, James M; Murphy, Sinéad M; Houlden, Henry; Innes, Amy; Kalmar, Bernadett; Greensmith, Linda; Reilly, Mary M

    2012-06-01

    Mutations in the gene HSPB1, encoding the small heat shock protein 27 (HSP27), are a cause of distal hereditary motor neuropathy (dHMN) and axonal Charcot-Marie-Tooth disease (CMT2). dHMN and CMT2 are differentiated by the presence of a sensory neuropathy in the latter although in the case of HSPB1 this division is artificial as CMT2 secondary to HSPB1 mutations is predominantly a motor neuropathy with only minimal sensory involvement. A recent study in mice has suggested that mutations in the C-terminus result in a motor only phenotype resembling dHMN, whereas mutations at the N-terminus result in a CMT2-like phenotype. However, we present a family with a novel mutation in the C-terminus of HSP27 (p.Glu175X) with a motor predominant distal neuropathy but with definite sensory involvement compatible with CMT2. This case highlights the artificial distinction between patients with motor predominant forms of CMT2 and dHMN and argues against the hypothesis that mutations in the C-terminus have no sensory involvement. PMID:22734906

  6. Design, synthesis and biological evaluation of a class of bioisosteric oximes of the novel dual peroxisome proliferator-activated receptor ?/? ligand LT175.

    PubMed

    Piemontese, Luca; Fracchiolla, Giuseppe; Carrieri, Antonio; Parente, Mariagiovanna; Laghezza, Antonio; Carbonara, Giuseppe; Sblano, Sabina; Tauro, Marilena; Gilardi, Federica; Tortorella, Paolo; Lavecchia, Antonio; Crestani, Maurizio; Desvergne, Béatrice; Loiodice, Fulvio

    2015-01-27

    The effects resulting from the introduction of an oxime group in place of the distal aromatic ring of the diphenyl moiety of LT175, previously reported as a PPAR?/? dual agonist, have been investigated. This modification allowed the identification of new bioisosteric ligands with fairly good activity on PPAR? and fine-tuned moderate activity on PPAR?. For the most interesting compound (S)-3, docking studies in PPAR? and PPAR? provided a molecular explanation for its different behavior as full and partial agonist of the two receptor isotypes, respectively. A further investigation of this compound was carried out performing gene expression studies on HepaRG cells. The results obtained allowed to hypothesize a possible mechanism through which this ligand could be useful in the treatment of metabolic disorders. The higher induction of the expression of some genes, compared to selective agonists, seems to confirm the importance of a dual PPAR?/? activity which probably involves a synergistic effect on both receptor subtypes. PMID:25497132

  7. WASP-104b and WASP-106b: two transiting hot Jupiters in 1.75-day and 9.3-day orbits

    E-print Network

    Smith, A M S; Armstrong, D J; Barros, S C C; Bonomo, A S; Bouchy, F; Brown, D J A; Cameron, A Collier; Delrez, L; Faedi, F; Gillon, M; Chew, Y Gómez Maqueo; Hébrard, G; Jehin, E; Lendl, M; Louden, T M; Maxted, P F L; Montagnier, G; Neveu-VanMalle, M; Osborn, H; Pepe, F; Pollacco, D; Queloz, D; Rostron, J W; Segransan, D; Smalley, B; Triaud, A H M J; Turner, O D; Udry, S; Walker, S R; West, R G; Wheatley, P J

    2014-01-01

    We report the discovery from the WASP survey of two exoplanetary systems, each consisting of a Jupiter-sized planet transiting an 11th magnitude (V) main-sequence star. WASP-104b orbits its star in 1.75 d, whereas WASP-106b has the fourth-longest orbital period of any planet discovered by means of transits observed from the ground, orbiting every 9.29 d. Each planet is more massive than Jupiter (WASP-104b has a mass of $1.27 \\pm 0.05~\\mathrm{M_{Jup}}$, while WASP-106b has a mass of $1.93 \\pm 0.08~\\mathrm{M_{Jup}}$). Both planets are just slightly larger than Jupiter, with radii of $1.14 \\pm 0.04$ and $1.09 \\pm 0.04~\\mathrm{R_{Jup}}$ for WASP-104 and WASP-106 respectively. No significant orbital eccentricity is detected in either system, and while this is not surprising in the case of the short-period WASP-104b, it is interesting in the case of WASP-106b, because many otherwise similar planets are known to have eccentric orbits.

  8. 1.75 h {sup -1} kpc SEPARATION DUAL ACTIVE GALACTIC NUCLEI AT z = 0.36 IN THE COSMOS FIELD

    SciTech Connect

    Comerford, Julia M.; Davis, Marc [Astronomy Department, 601 Campbell Hall, University of California, Berkeley, CA 94720 (United States); Griffith, Roger L.; Stern, Daniel [Jet Propulsion Laboratory, California Institute of Technology, MS 169-327, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States); Gerke, Brian F. [Kavli Institute for Particle Astrophysics and Cosmology, M/S 29, Stanford Linear Accelerator Center, 2575 Sand Hill Rd., Menlo Park, CA 94725 (United States); Cooper, Michael C. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Newman, Jeffrey A. [Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 (United States)

    2009-09-01

    We present strong evidence for dual active galactic nuclei (AGNs) in the z = 0.36 galaxy COSMOS J100043.15+020637.2. COSMOS Hubble Space Telescope (HST) imaging of the galaxy shows a tidal tail, indicating that the galaxy recently underwent a merger, as well as two bright point sources near the galaxy's center. The luminosities of these sources (derived from the HST image) and their emission line flux ratios (derived from Keck/DEIMOS slit spectroscopy) suggest that both are AGNs and not star-forming regions or supernovae. Observations from zCOSMOS, the Sloan Digital Sky Survey, XMM-Newton, Spitzer, and the Very Large Array fortify the evidence for AGN activity. With HST imaging we measure a projected spatial offset between the two AGNs of 1.75 {+-} 0.03 h {sup -1} kpc, and with DEIMOS we measure a 150 {+-} 40 km s{sup -1} line-of-sight velocity offset between the two AGNs. Combined, these observations provide substantial evidence that COSMOS J100043.15+020637.2 is a merger-remnant galaxy with dual AGNs.

  9. 17.5% p-Type Silicon Heterojunction Solar Cells with HWCVD a-Si:H as the Emitter and Back Contact

    SciTech Connect

    Wang, T. H.; Page, M. R.; Iwaniczko, E.; Wang, Q.; Xu,Y.; Yan, Y.; Roybal, L.; Levi, D.; Bauer, R.; Branz, H. M.; Yelundur, V.; Rohatgi, A.

    2005-11-01

    Thin hydrogenated amorphous silicon (a-Si:H) layers deposited by hot-wire chemical vapor deposition (HWCVD) are used as both emitters and back contacts in silicon heterojunction solar cells. Low interface recombination velocity and high open-circuit voltage are achieved by a low substrate temperature (<150 deg C) intrinsic a-Si:H deposition which ensures immediate amorphous silicon deposition. This is followed by deposition of doped a-Si:H at a higher temperature (>200 deg C) which appears to improve dopant activation. With an i/n a-Si:H emitter, we obtain a confirmed efficiency of 17.1% on textured p-type float-zone (FZ) silicon with a screen-printed aluminum back-surface-field (Al-BSF) contact. Employing a-Si:H as both the front emitter and the back contact, we achieve a confirmed efficiency of 17.5%, the highest reported efficiency for a p-type c-Si based heterojunction solar cell.

  10. IDCS J1426.5+3508: SUNYAEV-ZEL'DOVICH MEASUREMENT OF A MASSIVE INFRARED-SELECTED CLUSTER AT z = 1.75

    SciTech Connect

    Brodwin, M. [Department of Physics and Astronomy, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110 (United States); Gonzalez, A. H.; Fedeli, C.; Gettings, D.; Mancone, C. [Department of Astronomy, University of Florida, Gainesville, FL 32611 (United States); Stanford, S. A.; Zeimann, G. [Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States); Plagge, T.; Carlstrom, J. E.; Leitch, E. M. [Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States); Marrone, D. P. [Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States); Dey, A.; Jannuzi, B. T. [NOAO, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Eisenhardt, P. R.; Stern, D. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Joy, M. [Department of Space Science, VP62, NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States); Snyder, G. F. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA (United States)

    2012-07-10

    We report 31 GHz CARMA observations of IDCS J1426.5+3508, an infrared-selected galaxy cluster at z = 1.75. A Sunyaev-Zel'dovich (SZ) decrement is detected toward this cluster, indicating a total mass of M{sub 200,m} = (4.3 {+-} 1.1) Multiplication-Sign 10{sup 14} M{sub Sun} in agreement with the approximate X-ray mass of {approx}5 Multiplication-Sign 10{sup 14} M{sub Sun }. IDCS J1426.5+3508 is by far the most distant cluster yet detected via the SZ effect, and the most massive z {>=} 1.4 galaxy cluster found to date. Despite the mere {approx}1% probability of finding it in the 8.82 deg{sup 2} IRAC Distant Cluster Survey, IDCS J1426.5+3508 is not completely unexpected in {Lambda}CDM once the area of large, existing surveys is considered. IDCS J1426.5+3508 is, however, among the rarest, most extreme clusters ever discovered and indeed is an evolutionary precursor to the most massive known clusters at all redshifts. We discuss how imminent, highly sensitive SZ experiments will complement infrared techniques for statistical studies of the formation of the most massive galaxy clusters in the z > 1.5 universe, including potential precursors to IDCS J1426.5+3508.

  11. Ytterbium(+2) indenyl complexes: synthesis and crystal structures of (C 9H 7) 2Yb·DME, rac-(CH 2) 2(1-C 9H 6) 2Yb(THF) 2, and rac-(CH 2) 2[1-(4,7-(CH 3) 2C 9H 4)]Yb(THF) 2

    Microsoft Academic Search

    A. V. Khvostov; B. M. Bulychev; V. K. Belsky; A. I. Sizov

    1999-01-01

    Metallation of 2,2-bis(1?-indene)propane by sodium hydride followed by the reaction of the sodium derivative with YbCl3 yields (C9H7)2Yb·DME (1), an ytterbium(+2) complex with unlinked indenyl ligands. The reaction between (CH2)2(1-Ind?)2Li2 and YbCl3 in diethyl ether with subsequent reduction of the product by sodium metal in THF gives rac-(CH2)2(1-Ind?)2Yb(THF)2, where Ind?=C9H6 (2) and 4,7-(CH3)2C9H4 (3). The structures of the complexes were

  12. Bragg diffraction using a 100ps 17.5 keV x-ray backlighter and the Bragg Diffraction Imager

    SciTech Connect

    Maddox, B R; Park, H; Hawreliak, J; Comley, A; Elsholz, A; Van Maren, R; Remington, B A; Wark, J

    2010-05-13

    A new diagnostic for measuring Bragg diffraction from a laser-driven crystal using a 100ps 17.5 kV x-ray backlighter source is designed and tested successfully at the Omega EP laser facility on static Mo and Ta single crystal samples using a Mo Ka backlighter. The Bragg Diffraction Imager (BDI) consists of a heavily shielded enclosure and a precisely positioned beam block, attached to the main enclosure by an Aluminum arm. Image plate is used as the x-ray detector. The diffraction lines from Mo and Ta <222> planes are clearly detected with a high signal-to-noise using the 17.5 keV and 19.6 keV characteristic lines generated by a petawatt-driven Mo foil. This technique will be applied to shock and ramp-loaded single crystals on the Omega EP laser. Pulsed x-ray diffraction of shock- and ramp-compressed materials is an exciting new technique that can give insight into the dynamic behavior of materials at ultra-high pressure not achievable by any other means to date. X-ray diffraction can be used to determine not only the phase and compression of the lattice at high pressure, but by probing the lattice compression on a timescale equal to the 3D relaxation time of the material, information about dislocation mechanics, including dislocation multiplication rate and velocity, can also be derived. Both Bragg, or reflection, and Laue, or transmission, diffraction have been developed for shock-loaded low-Z crystalline structures such as Cu, Fe, and Si using nano-second scale low-energy implosion and He-{alpha} x-ray backlighters. However, higher-Z materials require higher x-ray probe energies to penetrate the samples, such as in Laue, or probe deep enough into the target, as in the case of Bragg diffraction. Petawatt laser-generated K{alpha} x-ray backlighters have been developed for use in high-energy radiography of dense targets and other HED applications requiring picosecond-scale burst of hard x-rays. While short pulse lasers are very efficient at producing high-energy x-rays, the characteristic x-rays produced in these thin foil targets are superimposed on a broad bremsstrahlung background and can easily saturate a detector if careful diagnostic shielding and experimental geometry are not implemented. A new diagnostic has been designed to measure Bragg diffraction from laser-driven crystal targets using characteristic x-rays from a short-pulse laser backlighter on the Omega EP laser. The Bragg Diffraction Imager, or BDI, is a TIM-mounted instrument consisting of a heavily shielded enclosure made from 3/8-inch thick Heavymet (W-Fe-Ni alloy) and a precisely positioned beam bock, attached to the main enclosure by an Aluminum arm. The beam block is made of 1-inch thick, Al-coated Heavymet and serves to block the x-rays directly from the petawatt backlight, while allowing the diffraction x-rays from the crystal to pass to the enclosure. A schematic of the BDI is shown in Fig. 1a. Image plates are used as the x-ray detector and are loaded through the top of the diagnostic in an Aluminum, light-tight cartridge. The front of the enclosure can be fitted with various filters to maximize the diffraction signal-to-noise.

  13. Cubic ZrW1.75Mo0.25O8 from a Rietveld refinement based on neutron powder diffraction data

    PubMed Central

    Deng, Xuebin; Cao, Yilong; Tao, Juzhou; Zhao, Xinhua

    2009-01-01

    The solid solution in the system Zr–Mo–W–O with composition ZrW1.75Mo0.25O8 (zirconium tungsten molybdenum octa­oxide) was prepared by solid-state reactions as a polycrystalline material. Its structure has cubic symmetry (space group P213)?at room temperature. The structure contains a network of corner-sharing ZrO6 octa­hedra (.3. symmetry) and MO4 (M = W, Mo) tetra­hedra (.3. symmetry). Along the main threefold axis of the cubic unit cell, the MO4 tetra­hedra are arranged in pairs forming M 2O8 units in which the M1O4 tetra­hedra have larger distortions in terms of bond distances and angles than the M2O4 tetra­hedra. These units are disordered over two possible orientations, with the M—Oterminal vectors pointing to the [111] or [ ] directions. The reversal of the orientations of the M 2O8 units results from the concerted flips of these units. The time-averaged proportions of flipped and unflipped M 2O8 units were determined and the fraction of unflipped M 2O8 units is about 0.95. The order degree of the M 2O8 unit orientation is about 0.9. During the reversal process, the M-atom site has a migration about 0.93?Å, one of the O-atom sites has a 0.25?Å migration distance, whereas two other O-atom sites migrate marginally (? 0.08?Å). The results prove the constraint strategy to be a reasonable approach based on the ratcheting mechanism. PMID:21583728

  14. Evolution of long-lived globular cluster stars. I. Grid of stellar models with helium enhancement at [Fe/H] = -1.75

    NASA Astrophysics Data System (ADS)

    Chantereau, W.; Charbonnel, C.; Decressin, T.

    2015-06-01

    Context. Our understanding of the formation and early evolution of globular clusters (GCs) has been totally overthrown with the discovery of the peculiar chemical properties of their long-lived host stars. Aims: As a consequence, the interpretation of the observed color-magnitude diagrams and of the properties of the GC stellar populations requires the use of stellar models computed with relevant chemical compositions. Methods: We present a grid of 224 stellar evolution models for low-mass stars with initial masses between 0.3 and 1.0 M? and initial helium mass fraction between 0.248 and 0.8 computed for [Fe/H] = -1.75 with the stellar evolution code STAREVOL. This grid is made available to the community. Results: We explore the implications of the assumed initial chemical distribution for the main properties of the stellar models: evolution paths in the Hertzsprung-Russel diagram (HRD), duration and characteristics of the main evolutionary phases, and the chemical nature of the white dwarf remnants. We also provide the ranges in initial stellar mass and helium content of the stars that populate the different regions of the HRD at the ages of 10 and 13.4 Gyr, which are typical for Galactic GCs. Appendix A is available in electronic form at http://www.aanda.orgTable 3 is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/578/A117

  15. Cemented Lubinus and Furlog total hip endoprosthesis: a 12-year follow-up study of 175 hips comparing the cementing technique.

    PubMed

    Alho, A; Lepistö, J; Ylinen, P; Paavilainen, T

    2000-01-01

    We analyzed 175 total hip replacements with cemented Lubinus and Furlong arthroplasties in 164 patients with a median age of 65 (32-80) years and followed them for 12 years to evaluate and compare the efficacy of total hip prosthesis designs. Survival analysis was combined with an analysis of radiological findings and a study of functional outcome of the patients. The 12-year survival of Furlong arthroplasty in patients of 60 years of age and older was O.85 (95% CI 1.00-0.52). The survival of Lubinus arthroplasty in patients younger than 60 years of age was 0.70 (0.91-0.48), while the survival in older patients was 0.75 (0.89-0.61). The 12-year survival of well-cemented Lubinus prosthesis was 0.91 (1.00-0.79), indicating the importance of the cementing technique. The survival of the cups was marginally better than that of the stems. In the 12-year follow-up study, the clinical state and function varied from hips ready for revision to hips where a continuously long survival could be predicted. Harris hip score did not differentiate between patients who had intact and loose components. We conclude that cemented arthroplasty affords a notable alternative with satisfactory long-term survival and function. The better survival of cemented cup than the stem may be utilized as a basis for "reverse" hybrid arthroplasty. Adequate long-term follow-up of all arthroplasties as a quality maintenance and to prevent difficult revisions is a major challenge. PMID:10853895

  16. RNA Extraction and Labeling 1. To IP pellet (~ 25 l vol), add 175 l of: 10 mM HEPES-NaOH, pH 7.5

    E-print Network

    Aris, John P.

    OAc. 1 hour at ­20°C. Spin 30 minutes at 4°C. 5. Wash with DEPC-treated 75% EtOH. 6. Dry in air or using85 RNA Extraction and Labeling 1. To IP pellet (~ 25 µl vol), add 175 µl of: 10 mM HEPES-NaOH, pH 7 of interface layer after extraction. 4. Ethanol precipitate with 3 volumes of 100% EtOH. No need to add 3 M Na

  17. LiberalStudies-HutchinsSchoolofLiberalStudies Page175Sonoma State University 2013-2014 Catalog liBeral stUdies -hUtChins sChool

    E-print Network

    Ravikumar, B.

    Interdisciplinary Lower- Division General Education Program Bachelor of Arts in Liberal Studies Track I LiberalStudies-HutchinsSchoolofLiberalStudies Page175Sonoma State University 2013-2014 Catalog liBeral stUdies - hUtChins sChool oF liBeral stUdies hUtchins schOOl Of liBeral stUDies Department Office

  18. Calculation of parity nonconservation in neutral ytterbium

    SciTech Connect

    Dzuba, V. A.; Flambaum, V. V. [School of Physics, University of New South Wales, Sydney, New South Wales 2052 (Australia)

    2011-04-15

    We use configuration interaction and many-body perturbation theory techniques to calculate spin-independent and spin-dependent parts of the parity-nonconserving amplitudes of the transitions between the 6s{sup 2} {sup 1}S{sub 0} ground state and the 6s5d {sup 3}D{sub 1} excited state of {sup 171}Yb and {sup 173}Yb. The results are presented in a form convenient for extracting spin-dependent interaction constants (such as anapole moment) from the measurements.

  19. Reconnaissance of the ? Pictoris system down to 1.75 AU with the L' - b and vector vortex coronagraph on VLT/NACO

    NASA Astrophysics Data System (ADS)

    Milli, J.; Absil, O.; Mawet, D.; Lagrange, A.-M.

    2013-09-01

    High contrast imaging has thoroughly combed through the limited parameter space accessible with first-generation ground-based adaptive optics instruments and the HST. Only a few objects were discovered, and many non-detections reported and statistically interpreted. The field is now in need of a technological breakthrough. We aim at opening a new parameter space with first-generation systems such as NACO at the Very Large Telescope, by providing ground-breaking inner working angle (IWA) capabilities in the L' band. This mid-infrared wavelength range is a sweet spot for high contrast coronagraphy since the planets-to-star brightness ratio is favorable, while Strehl ratio is naturally higher. An annular groove phase mask (AGPM) vector vortex coronagraph optimized for the L' band, made out of diamond subwavelength gratings has been manufactured and qualified in the lab. The AGPM enables high contrast imaging at very small IWA (here 0".09), potentially being the key to a new parameter space. Here we present the results of the installation and successful commissioning of an L'- band AGPM on VLT/NACO. During a recent science verification run, we imaged the inner regions of Beta Pictoris down to the previously unexplored projected radius of 1.75 AU with unprecedented point source sensitivity. The disk was also clearly resolved down to its inner truncation . The new NACO mode is an opportunity to introduce a more rigorous framework for deriving detection limits at very small angles, which is also relevant for SPHERE and GPI and every high contrast imaging instrument with small IWA ambitions. Indeed, classical tools assuming Gaussian statistics, perfectly valid at large separations, loose significance close to the center simply because the sample size decreases dramatically (fewer resolution elements at a given radius). Moreover, the probability density function (PDF) of speckle noise and associated confidence level for detection depend on radius. ADI was shown to transform speckles'modified Rician PDF into quasi-Gaussian PDF at large separations, but it is expected that this property of ADI does not hold true at small angles. Finally, the flux attenuation induced by ADI, potentially significant at small angles, does not scale linearly with the companion brightness, which makes its calibration more difficult.

  20. Polysomy of chromosome 17 in breast cancer tumors showing an overexpression of ERBB2: a study of 175 cases using fluorescence in situ hybridization and immunohistochemistry

    PubMed Central

    Salido, Marta; Tusquets, Ignasi; Corominas, Josep M; Suarez, Marta; Espinet, Blanca; Corzo, Cristina; Bellet, Meritxell; Fabregat, Xavier; Serrano, Sergi; Solé, Francesc

    2005-01-01

    Introduction One of the most common genetic aberrations associated with breast cancer is the amplification and overexpression of the ERBB2 proto-oncogene located at chromosome 17, bands q12-21. The amplification/overexpression occurs in 25 to 30% of all breast cancers. In breast cancer, aneusomy of chromosome 17, either monosomy or polysomy, is frequently observed by conventional cytogenetics and fluorescence in situ hybridization (FISH). The aim of this study was to discover whether or not numerical aberrations on chromosome 17 have a correlation to the amplification or overexpression of the ERBB2 gene and to analyze their clinical implications in subgroups showing 2+ or 3+ positive scores by immunohistochemistry (IHC). Methods We used FISH on a series of 175 formalin-fixed paraffin-embedded breast carcinomas to detect ERBB2 amplification, using a dual-probe system for the simultaneous enumeration of the ERBB2 gene and the centromeric region of chromosome 17, as well as using IHC to detect overexpression. We analyzed clinical and pathological variables in a subgroup of patients with 2+ and 3+ IHC scores (147 patients), to describe any differences in clinicopathological characteristics between polysomic and non-polysomic cases with the use of the ?2 test. Results We found 13% of cases presenting polysomy, and three cases presented monosomy 17 (2%). According to the status of the ERBB2 gene, instances of polysomy 17 were more frequently observed in non-amplified cases than in FISH-amplified cases, suggesting that the mechanism for ERBB2 amplification is independent of polysomy 17. Polysomy 17 was detected in patients with 2+ and 3+ IHC scores. We found that nodal involvement was more frequent in polysomic than in non-polysomic cases (P = 0.046). Conclusions The determination of the copy number of chromosome 17 should be incorporated into the assesment of ERBB2 status. It might also be helpful to differentiate a subgroup of breast cancer patients with polysomy of chromosome 17 and overexpression of ERBB2 protein that probably have genetic and clinical differences. PMID:15743507

  1. Apoptosis induction by antisense oligonucleotides against miR17-5p and miR20a in lung cancers overexpressing miR17-92

    Microsoft Academic Search

    H Matsubara; T Takeuchi; E Nishikawa; K Yanagisawa; Y Hayashita; H Ebi; H Yamada; M Suzuki; M Nagino; Y Nimura; H Osada; T Takahashi

    2007-01-01

    Amplification and overexpression of the miR-17-92 microRNAs (miRNA) cluster at 13q31.3 has recently reported, with pointers to functional involvement in the development of B-cell lymphomas and lung cancers. In the present study, we show that inhibition of miR-17-5p and miR-20a with antisense oligonucleotides (ONs) can induce apoptosis selectively in lung cancer cells overexpressing miR-17-92, suggesting the possibility of ‘OncomiR addiction’

  2. Real-time manifestation of strongly coupled spin and charge order parameters in stripe-ordered La(1.75)Sr(0.25)NiO(4) nickelate crystals using time-resolved resonant x-ray diffraction.

    PubMed

    Chuang, Y D; Lee, W S; Kung, Y F; Sorini, A P; Moritz, B; Moore, R G; Patthey, L; Trigo, M; Lu, D H; Kirchmann, P S; Yi, M; Krupin, O; Langner, M; Zhu, Y; Zhou, S Y; Reis, D A; Huse, N; Robinson, J S; Kaindl, R A; Schoenlein, R W; Johnson, S L; Först, M; Doering, D; Denes, P; Schlotter, W F; Turner, J J; Sasagawa, T; Hussain, Z; Shen, Z X; Devereaux, T P

    2013-03-22

    We investigate the order parameter dynamics of the stripe-ordered nickelate, La(1.75)Sr(0.25)NiO(4), using time-resolved resonant x-ray diffraction. In spite of distinct spin and charge energy scales, the two order parameters' amplitude dynamics are found to be linked together due to strong coupling. Additionally, the vector nature of the spin sector introduces a longer reorientation time scale which is absent in the charge sector. These findings demonstrate that the correlation linking the symmetry-broken states does not unbind during the nonequilibrium process, and the time scales are not necessarily associated with the characteristic energy scales of individual degrees of freedom. PMID:25166848

  3. X-ray diffraction investigation of crystals of bis(nitrosodicyano-methanido)tetrakis(tris(dimethylamino)phosphine oxide)ytterbium(III) nitrosodicyanomethanide, (Yb/ONC(CN/sub 2/)//sub 2//OP(N(CH/sub 3/)/sub 2/)/sub 2///sub 4/)ONC(CN)/sub 2/

    SciTech Connect

    Zub, Yu.L.; Sadikov, G.G.; Skopenko, V.V.; Porai-Koshits, M.A.; Nikolaev, V.P.

    1986-02-01

    The crystal structure of (Yb/ONC(CN)/sub 2///sub 2//OP(N(CH/sub 3/)/sub 2/)/sub 3///sub 4/)ONC(CN)/sub 2/ has been determined by x-ray diffraction analysis (diffractomter, Mo K..cap alpha.. radiation, 4396 reflections, isotropic-anisotropic least-squares method in the full-matrix variant to R = 0.081). The parameters of the monoclinic cell are: a = 11.440(3), b = 14.728(3), c = 34.912(9) A, ..beta.. = 97.53(2)/sup 0/, V = 5832(3) A/sup 3/, d(pycn) = 1.30(1), d(x-ray) = 1.335 g/cm/sup 3/, Z = 4, space group P2/sub 1//c. The structural elements of the crystals are the (Yb/ONC(CN)/sub 2///sub 2//OP(N(CH/sub 3/)/sub 2/)/sub 3///sub 4/)/sup +/ complex cation and the outer-sphere ONC(CN)/sub 2/ group, which randomly occupies two positions. The coordination number of ytterbium is 6 (all the ligands are coordinated as monodentate ligands by means of an oxygen atom), and the coordination polyhedron is an asymmetrically elongated tetragonal bipyramid, whose axial vertices are occupied by the oxygen atoms of the ..pi..-acid ligands. The mean length of the Yb-O(OP(N(CH/sub 3/)/sub 2/)/sub 3/) bonds is 2.197(11) A. The distances from the Yb atom to the oxygen atoms of the ONC(CN)/sub 2/ groups are equal to 2.233(15) and 2.315(18) A. A special feature of the complex cation is the presence of a fourth-order inversion pseudoaxis. A discussion of the structure of the coordination polyhedron and of the phosphoryl and nitrosodicyanomethanide ligands has been conducted with the aid of literature data.

  4. Lentiviral-mediated gene therapy results in sustained expression of ?-glucuronidase for up to 12 months in the gus(mps/mps) and up to 18 months in the gus(tm(L175F)Sly) mouse models of mucopolysaccharidosis type VII.

    PubMed

    Derrick-Roberts, Ainslie L K; Pyragius, Carmen E; Kaidonis, Xenia M; Jackson, Matilda R; Anson, Donald S; Byers, Sharon

    2014-09-01

    A number of mucopolysaccharidosis type VII (MPS VII) mouse models with different levels of residual enzyme activity have been created replicating the range of clinical phenotypes observed in human MPS VII patients. In this study, a lentivirus encoding murine ?-glucuronidase was administered intravenously at birth to both the severe (Gus(mps/mps) strain) and attenuated (Gus(tm(L175F)Sly) strain) mouse models of MPS VII. Circulating enzyme levels were normalized in the Gus(mps/mps) mice and were 3.5-fold higher than normal in the Gus(tm(L175F)Sly) mouse 12 and 18 months after administration. Tissue ?-glucuronidase activity increased over untreated levels in all tissues evaluated in both strains at 12 months, and the elevated level was maintained in Gus(tm(L175F)Sly) tissues at 18 months. These elevated enzyme levels reduced glycosaminoglycan storage in the liver, spleen, kidney, and heart in both models. Bone mineral volume decreased toward normal in both models after 12 months of therapy and after 18 months in the Gus(tm(L175F)Sly) mouse. Open-field exploration was improved in 18-month-old treated Gus(tm(L175F)Sly) mice, while spatial learning improved in both 12- and 18-month-old treated Gus(tm(L175F)Sly) mice. Overall, neonatal administration of lentiviral gene therapy resulted in sustained enzyme expression for up to 18 months in murine models of MPS VII. Significant improvements in biochemistry and enzymology as well as functional improvement of bone and behavior deficits in the Gus(tm(L175F)Sly) model were observed. Therapy significantly increased the lifespan of Gus(mps/mps) mice, with 12 months being the longest reported lentiviral treatment for this strain. It is important to assess the long-term outcome on enzyme levels and effect on pathology for lentiviral gene therapy to be a potential therapy for MPS patients. PMID:25003807

  5. Linear, non-linear optical susceptibilities and the hyperpolarizability of the mixed crystals Ag(0.5)Pb(1.75)Ge(S(1-x)Se(x))4: experiment and theory.

    PubMed

    Reshak, A H; Kogut, Y M; Fedorchuk, A O; Zamuruyeva, O V; Myronchuk, G L; Parasyuk, O V; Kamarudin, H; Auluck, S; Plucinski, K J; Bila, Jiri

    2013-11-21

    As the starting point for a comprehensive theoretical investigation of the linear and nonlinear optical susceptibilities, we have used our experimental crystallographic data for Ag0.5Pb1.75GeS3Se (Ag2Pb7Ge4S12Se4) reported. The experimental crystallographic positions were optimized by minimizing the forces acting on each atom to get meaningful theoretical predictions of the optical properties. The linear optical susceptibilities are calculated. We find that the optical band gap shows very good agreement with our measured gap. The second-order nonlinear optical (NLO) susceptibilities dispersion namely the optical second harmonic generation (SHG) is calculated and compared with our experimental measurements. The microscopic first order hyperpolarizability, ?123, vector component along the principal dipole moment directions for the ?((2))(123)(?) component was obtained theoretically and compared with our measured values at different temperatures. The dependence of the two-photon absorption (TPA) for the pump-probing at SHG of the microsecond CO2 laser was measured. In addition we explored the linear electro-optical effect in these crystals. This effect is described by the third rank polar tensors similarly to the SHG. However, for the Pockels effect besides the electronic contribution, the phonon subsystem also begins to play a principal role. As a consequence we study the dispersion of the linear electro-optical effects in the mentioned crystals. PMID:24097293

  6. Magnetic field effect on Fe-induced short-range magnetic correlation and electrical conductivity in Bi1.75Pb0.35Sr1.90Cu0.91Fe0.09O6+y

    SciTech Connect

    Wakimoto, S [Japan Atomic Energy Agency (JAEA); Hiraka, Haruhiro [Institute for Materials Research, Tohoku University, Sendai, Japan; Kudo, Kazutaka [Institute for Materials Research, Tohoku University, Sendai, Japan; Okamoto, Daichi [Institute for Materials Research, Tohoku University, Sendai, Japan; Nishizaki, Terukazu [Institute for Materials Research, Tohoku University, Sendai, Japan; Kakurai, Kazuhisa [Japan Atomic Energy Agency (JAEA); Hong, Tao [ORNL; Zheludev, Andrey [Laboratory for Neutron Scattering ETHZ & PSI; Tranquada, John M. [Brookhaven National Laboratory (BNL); Kobayashi, Norio [Institute for Materials Research, Tohoku University, Sendai, Japan; Yamada, Kazuyoshi [Institute for Materials Research, Tohoku University, Sendai, Japan

    2010-08-01

    We report electrical-resistivity measurements and neutron-diffraction studies under magnetic fields of Bi{sub 1.75}Pb{sub 0.35}Sr{sub 1.90}Cu{sub 0.91}Fe{sub 0.09}O{sub 6+y}, in which hole carriers are overdoped. This compound shows short-range incommensurate magnetic correlation with incommensurability {delta} = 0.21, whereas a Fe-free compound shows no magnetic correlation. Resistivity shows an up turn at low temperature in the form of ln(1/T) and shows no superconductivity. We observe reduction in resistivity by applying magnetic fields (i.e., a negative magnetoresistive effect) at temperatures below the onset of short-range magnetic correlation. Application of magnetic fields also suppresses the Fe-induced incommensurate magnetic correlation. We compare and contrast these observations with two different models: (1) stripe order and (2) dilute magnetic moments in a metallic alloy with associated Kondo behavior. The latter picture appears to be more relevant to the present results.

  7. 21 CFR 169.175 - Vanilla extract.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...oleo-resin. Vanilla extract may contain one or more of the following optional ingredients: (1) Glycerin. (2) Propylene glycol. (3) Sugar (including invert sugar). (4) Dextrose. (5) Corn sirup (including dried corn...

  8. 21 CFR 169.175 - Vanilla extract.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...oleo-resin. Vanilla extract may contain one or more of the following optional ingredients: (1) Glycerin. (2) Propylene glycol. (3) Sugar (including invert sugar). (4) Dextrose. (5) Corn sirup (including dried corn...

  9. 46 CFR 175.540 - Equivalents.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...calculation, information, or test, which provides a level of...submitted to the Marine Safety Center via the cognizant OCMI. If necessary...require engineering evaluations and tests to demonstrate the equivalence...submitted to the Marine Safety Center via the cognizant OCMI....

  10. Commentaries 175 Blackwell Publishers Ltd. 2002

    E-print Network

    Marcus, Gary F.

    discrimination using simple associate networks. Infancy, 2, 7­28. Shultz, T.R., & Bale, A.C. (in press). Neural network simu- lation of infant familiarization to artificial sentences; rule-like behavior without innately given perceptual analyzers ­ each of which is pre-wired to do a fairly sophisticated bit of domain

  11. 40 CFR 763.175 - Enforcement.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...CONTINUED) TOXIC SUBSTANCES CONTROL ACT ASBESTOS Prohibition of the Manufacture...and Distribution in Commerce of Certain Asbestos-Containing Products; Labeling Requirements...processing, or distribution in commerce of asbestos-containing products in violation...

  12. 25 CFR 175.6 - Information collection.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES General Provisions...information is being collected to provide electric power service to customers. Response...Information and Regulatory Affairs, Project 1076-0021, Office of Management...

  13. 27 CFR 9.175 - Dos Rios.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...Mendocino County, California, at the confluence of the Eel River and the Middle Fork of the Eel River. The area's boundaries are defined as follows...the section line, crossing the Middle Fork of the Eel River, to the southeast corner of section...

  14. 27 CFR 9.175 - Dos Rios.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...Mendocino County, California, at the confluence of the Eel River and the Middle Fork of the Eel River. The area's boundaries are defined as follows...the section line, crossing the Middle Fork of the Eel River, to the southeast corner of section...

  15. 27 CFR 9.175 - Dos Rios.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...Mendocino County, California, at the confluence of the Eel River and the Middle Fork of the Eel River. The area's boundaries are defined as follows...the section line, crossing the Middle Fork of the Eel River, to the southeast corner of section...

  16. 21 CFR 558.175 - Clopidol.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...Limitations Sponsor (1) 113.5 Broiler chickens and re-placement chickens...Bacitracin methylene disalicylate 4 to 50 Broiler chickens: As in paragraph (d)(1...Bacitracin 4 to 25 plus roxarsone 45.4 Broiler chickens: As in paragraph...

  17. 49 CFR 173.175 - Permeation devices.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...drop flat on the top; (iii) One drop flat on the long side; (iv) One drop flat on the short side; (v) One drop on a corner at the junction of three...identical packages. (f) The gross mass of the completed package must not...

  18. NASTRAN user's guide (Level 17.5)

    NASA Technical Reports Server (NTRS)

    Field, E. I.; Herting, D. N.; Morgan, M. J.

    1979-01-01

    The user's guide is a handbook for engineers and analysts who use the NASTRAN finite element computer program supplements the NASTRAN Theoretical Manual (NASA SP-221), the NASTRAN User's Manual (NASA SP-222), the NASTRAN Programmer's Manual (NASA SP-223), and the NASTRAN Demonstration Program Manual (NASA SP-224). It provides modeling hints, attributes of the program, and references to the four manuals listed.

  19. 24 CFR 891.175 - Technical assistance.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    For purposes of the Section 202 Program and the Section 811 Program, the Secretary shall make available appropriate technical assistance to assure that applicants having limited resources, particularly minority applicants, are able to participate more fully in the...

  20. 2 CFR 175.15 - Award term.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...through the use of force, fraud, or coercion for the purpose of subjection to involuntary servitude, peonage, debt bondage, or slavery. 3. “Private entity”: i. Means any entity other than a State, local government, Indian tribe, or foreign...