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1

Atomic masses of strontium and ytterbium  

NASA Astrophysics Data System (ADS)

The atomic masses of the three most abundant isotopes of strontium, 86,87,88Sr, and of the six most abundant isotopes of ytterbium, 170,171,172,173,174,176Yb, have been obtained from measurements of cyclotron frequency ratios of pairs of ions simultaneously trapped in a Penning trap. Our results, with one standard deviation uncertainty, are M(86Sr) = 85.909 260 730 9 (91) u, M(87Sr) = 86.908 877 497 0 (91) u, M(88Sr) = 87.905 612 257 1 (97) u, and M(170Yb) = 169.934 767 241 (18) u, M(171Yb) = 170.936 331 514 (19) u, M(172Yb) = 171.936 386 655 (18) u, M(173Yb) = 172.938 216 213 (18) u, M(174Yb) = 173.938 867 539 (18) u, M(176Yb) = 175.942 574 702 (22) u. These results have application to photon-recoil determinations of the fine-structure constant.

Rana, Raman; Hcker, Martin; Myers, Edmund G.

2012-11-01

2

Parity nonconservation in ytterbium ion  

SciTech Connect

We consider parity nonconservation (PNC) in singly ionized ytterbium (Yb{sup +}) arising from the neutral current weak interaction. We calculate the PNC electric dipole transition amplitude (E1{sub PNC}) and the properties associated with it using relativistic coupled-cluster theory. E1{sub PNC} for the [4f{sup 14}] {sup 2}6s{yields}[4f{sup 14}] {sup 2}5d{sub 3/2} transition in Yb{sup +} has been evaluated to within an accuracy of 5%. The improvement of this result is possible. It therefore appears that this ion is a promising candidate for testing the standard model of particle physics.

Sahoo, B. K. [Theoretical Physics Division, Physical Research Laboratory, Ahmedabad-380009 (India); Das, B. P. [Theoretical Astrophysics Group, Indian Institute of Astrophysics, Bangalore-560034 (India)

2011-07-15

3

Photoassociative production of ultracold heteronuclear ytterbium molecules  

SciTech Connect

We report observations of photoassociation (PA) spectra near the intercombination line in isotopic mixtures of ultracold ytterbium gases. Several heteronuclear bound states have been found for the excited {sup 170}Yb{sup 174}Yb and {sup 174}Yb{sup 176}Yb molecules. We develop a single-channel mass-scaled interaction model for the excited state molecule which well reproduces the measured bound state energies. This is an important step toward optical control of interactions in mixtures of ultracold ytterbium gases using heteronuclear optical Feshbach resonances. The model developed is applicable in collisions of other similar systems, such as cadmium and mercury.

Borkowski, Mateusz; Ciurylo, Roman [Instytut Fizyki, Uniwersytet Mikolaja Kopernika, ul. Grudziadzka 5/7, PL-87-100 Torun (Poland); Julienne, Paul S. [Joint Quantum Institute, National Institute of Standards and Technology and the University of Maryland, 100 Bureau Drive, Stop 8423, Gaithersburg, Maryland 20899-8423 (United States); Yamazaki, Rekishu; Takahashi, Yoshiro [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan); CREST, JST, 4-1-8 Honcho Kawaguchi, Saitama 332-0012 (Japan); Hara, Hideaki; Taie, Shintaro; Sugawa, Seiji; Takasu, Yosuke [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan); Enomoto, Katsunari [Department of Physics, University of Toyama, Toyama 930-8555 (Japan)

2011-09-15

4

The First Spectrum of Ytterbium (Yb1).  

National Technical Information Service (NTIS)

Wavelengths and estimated intensities for 1791 lines of neutral ytterbium in the region 2155 to 31 308 A are reported. The Zeeman effect has been investigated for 249 of these lines. Analysis of the data has resulted in classification of 787 lines as tran...

W. F. Meggers J. L. Tech

1977-01-01

5

Half life of 175Hf.  

PubMed

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 70.650.19 days. The present result agrees with the literature data well, while the accuracy was improved. PMID:22871434

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

2012-06-21

6

21 CFR 137.175 - Phosphated flour.  

Code of Federal Regulations, 2010 CFR

... 2010-04-01 false Phosphated flour. 137.175 Section 137.175 ...FOOD FOR HUMAN CONSUMPTION CEREAL FLOURS AND RELATED PRODUCTS Requirements for Specific Standardized Cereal Flours and Related Products § 137.175...

2010-04-01

7

21 CFR 137.175 - Phosphated flour.  

Code of Federal Regulations, 2010 CFR

... 2009-04-01 false Phosphated flour. 137.175 Section 137.175 ...FOOD FOR HUMAN CONSUMPTION CEREAL FLOURS AND RELATED PRODUCTS Requirements for Specific Standardized Cereal Flours and Related Products § 137.175...

2009-04-01

8

21 CFR 137.175 - Phosphated flour.  

Code of Federal Regulations, 2013 CFR

... 2013-04-01 false Phosphated flour. 137.175 Section 137.175 ...FOOD FOR HUMAN CONSUMPTION CEREAL FLOURS AND RELATED PRODUCTS Requirements for Specific Standardized Cereal Flours and Related Products § 137.175...

2013-04-01

9

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

PubMed

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

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

2002-09-01

10

175Yb-labeled hydroxyapatite: a potential agent for use in radiation synovectomy of small joints.  

PubMed

The preparation of 175Yb-labeled hydroxyapatite (HA) particle is described for possible use as an agent for radiation synovectomy (RS) of small-sized joints. 175Yb was produced by thermal neutron irradiation of enriched (98.6% in 174Yb) ytterbium target at a flux of approximately 3 x 10(13) n/cm(2)/s for 7 days. Specific activity of 5.5-6.0 GBq/mg and a very high radionuclidic purity to the extent of approximately 100% were obtained. In the work reported herein, HA could be labeled with 175Yb in very high radiochemical purity (>99%) using 10 mg of HA particle at pH approximately 7. The radiolabeled particulates showed excellent in vitro stability at room temperature. Serial scintigraphic images of normal as well as arthritis-bearing Wistar rats following intra-articular injection of 175Yb-HA particles in the knee joint showed complete retention of activity within the synovial cavity with no measurable activity leaching out from the joint till 144 h post-injection. PMID:16720253

Chakraborty, Sudipta; Das, Tapas; Banerjee, Sharmila; Subramanian, Suresh; Sarma, Haladhar Dev; Venkatesh, Meera

2006-05-02

11

21 CFR 172.175 - Sodium nitrite.  

Code of Federal Regulations, 2013 CFR

...3 2013-04-01 2013-04-01 false Sodium nitrite. 172.175 Section 172.175 Food...CONSUMPTION Food Preservatives § 172.175 Sodium nitrite. The food additive sodium nitrite may be safely used in or on...

2013-04-01

12

21 CFR 169.175 - Vanilla extract.  

Code of Federal Regulations, 2010 CFR

... 2 2009-04-01 2009-04-01 false Vanilla extract. 169.175 Section 169.175 Food...Standardized Food Dressings and Flavorings § 169.175 Vanilla extract. (a) Vanilla extract is the solution in aqueous ethyl...

2009-04-01

13

21 CFR 169.175 - Vanilla extract.  

Code of Federal Regulations, 2010 CFR

... 2 2010-04-01 2010-04-01 false Vanilla extract. 169.175 Section 169.175 Food...Standardized Food Dressings and Flavorings § 169.175 Vanilla extract. (a) Vanilla extract is the solution in aqueous ethyl...

2010-04-01

14

Progress towards parity nonconservation in atomic ytterbium  

NASA Astrophysics Data System (ADS)

We have made measurements on the forbidden 6s2 1S 0 ? 5d6s 3D1 transition in atomic ytterbium. These measurements are a significant step in the on-going effort to study atomic parity nonconservation utilizing this transition. This transition is expected to exhibit significantly larger parity-nonconserving effects than those studied in other atoms and is well suited for the study of both nuclear-spin-independent and nuclear-spin-dependent parity-nonconserving effects. We have observed the magnetic-dipole amplitude for the transition using the technique of Stark interference. Ytterbium atoms were excited on the 6s 2 1S0 ? 5d6s 3D 1 transition with resonant, linearly polarized light at 408 nm. The atoms were excited in the presence of electric and magnetic fields oriented to cause interference between the magnetic-dipole and Stark-induced electric-dipole transition amplitudes. The number of atoms excited was monitored through fluorescence at 556 nm resulting from the 6s6p 3P1 ? 6s 2 1S0 branch of the decay. The direction of the fields was changed to separate out the contribution from the interference term. We find |<5d6s 3D1|mu|6s2 1S0>| = 1.33(6)Stat(6) beta x 10-4mu0, where the second error comes from the uncertainty in the vector transition polarizability, beta. This measurement also constitutes the first reported observation of magneto-electric Jones dichroism; a difference in absorption between light polarized at +/-45 relative to the direction of the collinear electric and magnetic fields. We have also implemented a high-finesse optical power build-up cavity, an essential ingredient for the future parity-nonconservation experiment. The frequency of the 408-nm light was locked to the power-build up cavity and the resonant frequency of the cavity was scanned over the atomic resonance. Ytterbium atoms were excited within the cavity in the presence of a dc electric field and the spectral line shapes were observed through fluorescence at 556 nm. The spectral line was modeled using a density-matrix calculation that included the effects of ac-Stark shifts on the transition resulting from the intense light field inside the cavity. By comparing the calculation with the experiment we extracted a value for a combination of the scalar and tensor ac-Stark shifts of the 6s2 1S0 ? 5d6s 3D1 transition resulting from light at 408 nm.

Stalnaker, Jason Evan

15

Mode-locked ytterbium fiber lasers.  

PubMed

A compact fiber laser is demonstrated with use of a Gires-Tournois compensator and a short length (2-4 cm-long) of highly doped ytterbium (Yb) fiber providing net anomalous group-velocity dispersion. With use of a novel semiconductor saturable absorber mirror based on GaInNAs structure, self-started 1.5-ps-pulse mode-locked operation was obtained at 1023 nm with a repetition rate of 95 MHz. A mode-locked Yb-doped fiber laser was developed without the use of any dispersion compensation technique. Overall group-velocity dispersion was minimized by using a short length of highly doped Yb fiber in a compact amplifying loop cavity. Self-started mode-locked operation was obtained in 980-1030-nm wavelength range with a fundamental repetition rate of 140 MHz. PMID:15065719

Orsila, Lasse; Gomes, Lus A; Xiang, Ning; Jouhti, Tomi; Okhotnikov, Oleg G

2004-03-20

16

Photoassociation of Laser-cooled Ytterbium Atoms  

NASA Astrophysics Data System (ADS)

We report photoassociation of laser-cooled ytterbium (Yb) atoms. By detecting the trap loss of 174Yb atoms in the FORT due to the photoassociation beam, we could observe more than 90 photoassociation resonances of vibrational levels in the {}1? u^ + state which connects asymptotically to the 1S0+1P1 atomic state in the dissociation limit. From the observed resonance frequencies we could precisely determine the atomic radiative lifetime of the 1P1 state to 5.464 0.005 ns. We have also observed linebroadening of photoassociation resonances, which is ascribed to the predissociation to the triplet states, and determined the transition probability to be 0.2. Furthermore, we have observed the decrease of the intensity of photoassiciation signal at 435 GHz detuning from the 1S0+1P1 asymptote, from which the scattering length is estimated to be equal to or less than 3 nm.

Takahashi, Y.; Takasu, Y.; Komori, K.; Honda, K.; Kumakura, M.; Yabuzaki, T.

2003-04-01

17

Investigations Into Ytterbium, Ytterbium-Erbium and Thulium-Doped Silica-Based Fibre Lasers  

NASA Astrophysics Data System (ADS)

Available from UMI in association with The British Library. Continuous-wave monomode laser oscillation has been demonstrated in ytterbium-doped fiber at 974nm and around 1040nm for pump wavelengths in the 0.8mu m region. High slope efficiencies (up to 78%) and low threshold powers (10mW absorbed) were measured for this device. Tunable operation from 1000nm to 1162nm, the generation of Q-switched pulses, and efficient amplified spontaneous emission have also been demonstrated, and some of these features have been modelled. A fibre doped with erbium and sensitised with ytterbium has been investigated to study the effect of energy transfer from the ytterbium co-dopant to the erbium ions after excitation at wavelengths in the 0.8 ?m region. The effects of pump excited state absorption on the threshold and slope efficiency have been characterised. Continuous-wave monomode laser oscillation was observed at 1.564mum with a 5mW absorbed threshold power. The laser wavelength was tunable from 1.521mum to 1.562mu m. Continuous-wave monomode laser action in a thulium -doped fibre, also pumped in the 0.8mum region, was observed at around 2mum with an absorbed threshold power of about 30mW. The laser wavelength was tunable from 1810nm to 2014nm. A change of pump source to a high power Nd:YAG laser operating at 1.064mum yielded fibre laser output powers of up to 1.35W with a threshold power of 600mW. Pump excited state absorption at 1.064mum and the resulting upconverted visible fluorescence has been investigated and modelled.

Perry, Ian Richard

18

40 CFR 161.175 - Certified limits.  

Code of Federal Regulations, 2013 CFR

...Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PESTICIDE PROGRAMS DATA REQUIREMENTS FOR REGISTRATION OF ANTIMICROBIAL PESTICIDES Product Chemistry Data Requirements § 161.175 Certified limits. The applicant must...

2013-07-01

19

33 CFR 175.115 - Exceptions.  

Code of Federal Regulations, 2013 CFR

...115 Exceptions. The following persons need...night use, selected from the list in § 175.130 or § 175.135, in the number required, between...using a manually propelled boat; or (c) A person using a sailboat of completely open construction, not...

2013-07-01

20

49 CFR 175.705 - Radioactive contamination.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Radioactive contamination. 175.705 Section...Classification of Material § 175.705 Radioactive contamination. (a) A carrier...contact by any person with Class 7 (radioactive) materials that may have been...

2012-10-01

21

49 CFR 175.705 - Radioactive contamination.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Radioactive contamination. 175.705 Section...Classification of Material § 175.705 Radioactive contamination. (a) A carrier...contact by any person with Class 7 (radioactive) materials that may have been...

2011-10-01

22

Nuclear Data Sheets for A = 175  

NASA Astrophysics Data System (ADS)

Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for all nuclei with mass number A = 175. This evaluation for A = 175 supersedes the earlier one by A.O. Macchiavelli and E. Browne (1993Ma79), published in Nuclear Data Sheets 69, 903 (1993). Highlights of this publication are the following: This evaluation includes the first study (1996Zh03) of 175Er ?- decay, which has been used to interpret a predicted ground state doublet in 175Tm. The deep-inelastic reaction studies (1999As05, 1997Le11, and 1997Le10) extended the yrast band of 175Yb to the J?=41/2- level at 4426 keV. New studies (1994Mi04) of 175Yb ?- decay have provided significantly more precise ?-ray intensities. New data (2002Ro17 and 1998To14) from the alpha decay of 179Tl have been used for tentatively assigning spin and parity to 175Au ground and first-excited states. Tentative assignment of 175Hg g.s. is adopted from 176Tl proton decay (2004Ke06).

Basunia, M. Shamsuzzoha

2004-08-01

23

Nuclear data sheets for A = 175[sup *  

SciTech Connect

Evaluated spectroscopic data from radioactive decay and reaction studies are given for all nuclei with mass number A = 175. Adopted nuclear structure and radiation information is presented in tabular and decay scheme form. This evaluation for A = 175 supersedes the earlier by M.M. Minor.

Macchiavelli, A O; Browne, E [Lawrence Berkeley Laboratory, CA (United States)

1993-08-01

24

1028 nm single mode Ytterbium-doped fiber laser  

NASA Astrophysics Data System (ADS)

An efficient Ytterbium-doped fiber laser (YDFL) operating at 1028 nm is demonstrated using a fiber Bragg grating (FBG). The 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, a Ytterbium ion lifetime of 1.1 ms, an absorption of 7.65 dB/m at 976 nm. The fiber laser has the maximum efficiency of 51% with pump power threshold of 19 mW using a FBG in conjunction with a Fresnel reflection to form a linear cavity resonator. The efficiency and threshold are better compared to the similar YDFL configuration using a commercial YDF.

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

2009-05-01

25

All-fibre ytterbium laser tunable within 45 nm  

SciTech Connect

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)

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

26

Photodarkening in ytterbium-doped silica fibers  

NASA Astrophysics Data System (ADS)

Ytterbium-doped fibers are widely used in applications requiring short fiber amplifiers for high peak power pulse amplification. One of the key challenges posed on the performance and reliability of such amplifiers is mitigating photodarkening of the active fiber. Photodarkening manifests itself as a temporal increase in broadband absorption centered at visible wavelengths, and varies on how the active fiber has been manufactured. The tail of the photodarkening absorption extends to the 1?m region, thus in some cases seriously degrading the fiber efficiency over time. Accurate measurement methods for characterization of photodarkening must be developed in order to better understand its causes and create techniques to eliminate it so as to secure widespread commercialization of reliable Yb-doped fibers. This paper presents a simple method to characterize photodarkening in both single-mode and double clad Yb-doped fibers. A short length of fiber is pumped using high brightness source in order to achieve high and uniform inversion. The high inversion speeds up the formation of the color centers to the high degradation level, thus reducing the analyzing time from weeks to few of hours. With this method, photodarkening can be measured even from relatively short fibers by monitoring loss at visible wavelengths, where the degradation is greatest. We have analyzed the repeatability of the measurement method against the pumping conditions and fiber sample properties. The impact of photodarkening in different applications is discussed. We present the results of recent optimization of Liekki Yb1200 product family and also compare these with some other commercially available fibers.

Koponen, J. J.; Sderlund, M. J.; Tammela, S. K. T.; Po, H.

2005-10-01

27

7 CFR 1.75 - General stipulations.  

Code of Federal Regulations, 2012 CFR

...REGULATIONS Cooperative Production of Television Films § 1.75 General stipulations...recognized by the motion picture or television industry. In lieu of complete distribution plans for a television series, a producer must...

2012-01-01

28

40 CFR 161.175 - Certified limits.  

Code of Federal Regulations, 2011 CFR

...PROTECTION AGENCY (CONTINUED) PESTICIDE PROGRAMS DATA REQUIREMENTS FOR REGISTRATION OF ANTIMICROBIAL PESTICIDES Product Chemistry Data Requirements § 161.175 Certified limits. The applicant must propose certified limits for the...

2011-07-01

29

40 CFR 161.175 - Certified limits.  

Code of Federal Regulations, 2012 CFR

...PROTECTION AGENCY (CONTINUED) PESTICIDE PROGRAMS DATA REQUIREMENTS FOR REGISTRATION OF ANTIMICROBIAL PESTICIDES Product Chemistry Data Requirements § 161.175 Certified limits. The applicant must propose certified limits for the...

2012-07-01

30

49 CFR 173.175 - Permeation devices.  

Code of Federal Regulations, 2011 CFR

...175 Permeation devices. Permeation devices that contain hazardous materials and that are used for calibrating air quality monitoring devices are not subject to the requirements of this subchapter provided the following requirements are...

2011-10-01

31

49 CFR 173.175 - Permeation devices.  

Code of Federal Regulations, 2012 CFR

...175 Permeation devices. Permeation devices that contain hazardous materials and that are used for calibrating air quality monitoring devices are not subject to the requirements of this subchapter provided the following requirements are...

2012-10-01

32

2 CFR 175.10 - Statutory requirement.  

Code of Federal Regulations, 2013 CFR

...POLICY REQUIREMENTS AWARD TERM FOR TRAFFICKING IN PERSONS § 175.10 Statutory...to terminate the award, without penalty, if the recipient or a subrecipient...a) Engages in severe forms of trafficking in persons during the period...

2013-01-01

33

33 CFR 117.175 - Mokelumne River.  

Code of Federal Regulations, 2013 CFR

... Navigation and Navigable Waters 1 2013-07-01 2013-07-01... Navigation and Navigable Waters COAST GUARD, DEPARTMENT...REGULATIONS Specific Requirements California § 117.175 Mokelumne River. (a) The draw of the California Department of...

2013-07-01

34

46 CFR 45.175 - Applicable routes.  

Code of Federal Regulations, 2011 CFR

...HOMELAND SECURITY (CONTINUED) LOAD LINES GREAT LAKES LOAD LINES Unmanned River Barges on Lake Michigan Routes § 45.175 Applicable routes...following routes, including intermediate ports, on Lake Michigan, between Calumet Harbor, IL,...

2011-10-01

35

46 CFR 45.175 - Applicable routes.  

Code of Federal Regulations, 2012 CFR

...HOMELAND SECURITY (CONTINUED) LOAD LINES GREAT LAKES LOAD LINES Unmanned River Barges on Lake Michigan Routes § 45.175 Applicable routes...following routes, including intermediate ports, on Lake Michigan, between Calumet Harbor, IL,...

2012-10-01

36

40 CFR 61.175 - Monitoring requirements.  

Code of Federal Regulations, 2013 CFR

...Inorganic Arsenic Emissions From Primary Copper Smelters § 61.175 Monitoring requirements...redetermine the reference opacity level for the copper converter secondary emission stream at...b)(1) for the capture of secondary copper converter emissions shall...

2013-07-01

37

Toward IFE Oriented Laser Chains: Cryogenically Cooled Ytterbium Doped Materials  

SciTech Connect

With the aim to set up Inertial Fusion Energy (IFE) driver, we develop the properties of the Ytterbium doped materials and the problems met when designing such a system: essentially thermal management and ASE gain depletion. We after present the experimental results obtained using sesquioxide Yb{sup 3+} doped ceramics at cryogenic temperature. We also propose a solution for minimizing the ASE problem.

Bourdet, G. [LULI, Unite Mixte no 7605 CNRS-CEA-Ecole Polytechnique-Universite Pierre et Marie Curie, Route de Saclay, 91128 Palaiseau (France); Casagrande, O. [Departement des Lasers de Puissance, Centre d'Etudes Scientifiques et Techniques d'Aquitaine (CESTA), Commissariat a l'Energie Atomique BP2, 33114 Le Barp (France); Thales Laser SA, Domaine de Corbeville, Route Departementale 128, BP 46-91401 Orsay Cedex (France); Cardinali, V.; Deguil-Robin, N.; Le Garrec, B. [Departement des Lasers de Puissance, Centre d'Etudes Scientifiques et Techniques d'Aquitaine (CESTA), Commissariat a l'Energie Atomique BP2, 33114 Le Barp (France)

2009-09-27

38

Gain analysis of Erbium and Ytterbium Doped Optical Fiber Amplifiers  

Microsoft Academic Search

In this study, importance of optical amplifiers which are used in optical communication systems is explained and gains of EDFA, Erbium Doped Fiber Amplifier, and YDFA, Ytterbium Doped Fiber Amplifier, which are among the most commonly used optical amplifiers today, are analysed based on their performance parameters. The effects of the power of input signal, the power of pump laser,

Tolga Kucukarslan; N. Ozlem Unverdi

2012-01-01

39

28 CFR 0.175 - Judicial and administrative proceedings.  

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Judicial and administrative proceedings. 0.175 Section 0.175 Judicial Administration DEPARTMENT...by Witnesses § 0.175 Judicial and administrative proceedings...objection to the proposed grant of immunity. (c) The...

2013-07-01

40

19 CFR 175.22 - Publication of decisions following petition.  

Code of Federal Regulations, 2010 CFR

...2009-04-01 false Publication of decisions following petition. 175.22 Section 175...DOMESTIC INTERESTED PARTIES Procedure Following Petition § 175.22 Publication of decisions following petition. (a) Incorrect...

2009-04-01

41

19 CFR 175.22 - Publication of decisions following petition.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Publication of decisions following petition. 175.22 Section 175...DOMESTIC INTERESTED PARTIES Procedure Following Petition § 175.22 Publication of decisions following petition. (a) Incorrect...

2010-04-01

42

33 CFR 175.130 - Visual distress signals accepted.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 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...

2009-07-01

43

25 CFR 175.22 - Requirements for receiving electrical service.  

Code of Federal Regulations, 2013 CFR

... 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...

2013-04-01

44

7 CFR 1726.175 - General plant materials.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false General plant materials. 1726.175 Section 1726.175 ...SYSTEM CONSTRUCTION POLICIES AND PROCEDURES General Plant § 1726.175 General plant materials. This section covers items...

2013-01-01

45

Faraday rotation in single-crystal ytterbium gallium garnet  

Microsoft Academic Search

Faraday rotation (FR) measurements performed on single-crystal ytterbium gallium garnet (YbGG) at 0.6328- and 1.15-?m wavelengths are presented in a magnetic field up to 20 kOe applied along the three main crystallographic directions and in the 6300 K temperature range. At 0.6328 ?m, the FR is proportional to the magnetic field and a strong anisotropy of the Verdet constant (V)

M. Guillot; H. Le Gall; J. Ostorero; M. Artinian; A. Marchand

1987-01-01

46

Synthesis of nanocrystalline ytterbium modified PbTiO3  

Microsoft Academic Search

Ytterbium (Yb) modified lead titanate ceramics (Pb1-xYbx TiO3, with x=0.05) (PYbT) were prepared by the Pechini method. The materials were calcinated under flowing oxygen at different temperatures from 300C to 700C. Nanostructured PYbT was obtained by high-energy milling and investigated using X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and

F. C. D. Lemos; E. Longo; E. R. Leite; D. M. A. Melo; A. O. Silva

2004-01-01

47

Synthesis of nanocrystalline ytterbium modified PbTiO 3  

Microsoft Academic Search

Ytterbium (Yb) modified lead titanate ceramics (Pb1?xYbx TiO3, with x=0.05) (PYbT) were prepared by the Pechini method. The materials were calcinated under flowing oxygen at different temperatures from 300C to 700C. Nanostructured PYbT was obtained by high-energy milling and investigated using X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and

F. C. D Lemos; E Longo; E. R Leite; D. M. A Melo; A. O Silva

2004-01-01

48

Low frequency noise distributed-feedback ytterbium fibre laser  

SciTech Connect

We report a single-frequency 1-W fibre laser source emitting at 1093 nm, composed of a distributed-feedback ytterbium fibre laser and fibre-optic amplifier. The laser frequency was stabilised by side-locking to a transmission peak of a Fabry - Perot interferometer, and the residual frequency noise spectrum of the laser was measured. Our results indicate that the laser linewidth can be narrowed down below 1 kHz. (lasers)

Nikulin, M A; Babin, S A; Kablukov, S I [Novosibirsk State University, Novosibirsk (Russian Federation); Dmitriev, Aleksandr K; Dychkov, Aleksandr S; Lugovoy, Aleksei A [Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk (Russian Federation); Pecherskii, Yu Ya [Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)

2009-10-31

49

Ytterbium Clusters in Fluorite CaF2  

NASA Astrophysics Data System (ADS)

The crystal structure of the ytterbium hexameric cluster in CaF2 has been calculated in the framework of the embedded-cluster method within the shell model, in pair potential approximation. The crystal field parameters and scheme of the energy levels for Yb6F36 hexameric cluster were calculated in the exchange charges model. Also, the optical spectra of Yb3+ single center in CaF2 (cubic and tetragonal symmetry) was calculated and discussed.

Nikiforov, Anatoliy E.; Chernyshev, Vladimir A.; Volodin, Vasiliy P.; Avram, Nicolae M.; Avram, Calin N.

2009-05-01

50

Comparison of photodarkening in Ytterbium-doped fibers  

NASA Astrophysics Data System (ADS)

Development of photodarkening in two similar large-mode-area ytterbium doped fibers from different sources is compared. The excess loss induced by photodarkening is derived from transmission loss measurements of pristine and pumped or photodarkened samples. To accelerate the photodarkening process, cladding pumping is used so as to achieve high and uniform inversion through the sample. Further, intensity profiles are measured and compared in effort to detect possible radial variations in the induced losses.

Sderlund, Mikko; Montiel, Joan; Tammela, Simo; Yliniemi, Sanna; Honkanen, Seppo

2008-03-01

51

Mode-Locked Ytterbium-Doped Fiber Lasers  

Microsoft Academic Search

In this article, we discuss recent advances in ultra-short pulse generation with ytterbium-doped fiber lasers. We discuss the fundamental properties and technical challenges of mode-locked single-mode fiber lasers operating in the 1-mum range, and the methods to achieve high peak-powers. We demonstrate a high-power passively mode-locked fiber laser based on a photonic crystal fiber featuring large-mode-core and short absorption length

Clovis Chdot; Caroline Lecaplain; Said Idlahcen; Gilles Martel; Ammar Hideur

2008-01-01

52

Luminescence and photoinduced absorption in ytterbium-doped optical fibres  

NASA Astrophysics Data System (ADS)

Photochemical reactions induced in the glass network of an ytterbium-doped fibre core by IR laser pumping and UV irradiation have been investigated by analysing absorption and luminescence spectra. We have performed comparative studies of the photoinduced absorption and luminescence spectra of fibre preforms differing in core glass composition: Al2O3 : SiO2, Al2O3 : Yb2O3 : SiO2, and P2O5 : Yb2O3 : SiO2. The UV absorption spectra of unirradiated preform core samples show strong bands peaking at 5.1 and 6.5 eV, whose excitation plays a key role in photoinduced colour centre generation in the glass network. 'Direct' UV excitation of the 5.1- and 6.5-eV absorption bands at 244 and 193 nm leads to the reduction of some of the Yb3+ ions to Yb2+. The photodarkening of ytterbium-doped fibres by IR pumping is shown to result from oxygen hole centre generation. A phenomenological model is proposed for the IR-pumping-induced photodarkening of ytterbium-doped fibres. The model predicts that colour centre generation in the core glass network and the associated absorption in the visible range result from a cooperative effect involving simultaneous excitation of a cluster composed of several closely spaced Yb3+ ions.

Rybaltovsky, A. A.; Aleshkina, S. S.; Likhachev, M. E.; Bubnov, M. M.; Umnikov, A. A.; Yashkov, M. V.; Gur'yanov, Aleksei N.; Dianov, Evgenii M.

2011-12-01

53

175Hp contrarotating homopolar motor design report  

NASA Astrophysics Data System (ADS)

A normally conducting contrarotating homopolar motor has been designed and constructed. The reaction torque, in the outer rotor, from the inner rotor is utilized to produce true contrarotation. The machine utilizes liquid cooled conductors, high performance liquid metal current collectors, and ferrous conductors in the active region. The basic machine output is 175 hp at + or - 1,200 rpm with an input of 4 volts and 35,000 amps.

Cannell, Michael J.; Drake, John L.; McConnell, Richard A.; Martino, William R.

1994-06-01

54

Transition probability studies in 175Au  

NASA Astrophysics Data System (ADS)

Transition probabilities have been measured between the low-lying yrast states in 175Au by employing the recoil distance Doppler-shift method combined with the selective recoil-decay tagging technique. Reduced transition probabilities and magnitudes of transition quadrupole moments have been extracted from measured lifetimes allowing dramatic changes in nuclear structure within a low excitation-energy range to probed. The transition quadrupole moment data are discussed in terms of available systematics as a function of atomic number and aligned angular momentum.

Grahn, T.; Watkins, H.; Joss, D. T.; Page, R. D.; Carroll, R. J.; Dewald, A.; Greenlees, P. T.; Hackstein, M.; Herzberg, R.-D.; Jakobsson, U.; Jones, P. M.; Julin, R.; Juutinen, S.; Ketelhut, S.; Kll, Th; Krcken, R.; Labiche, M.; Leino, M.; Lumley, N.; Maierbeck, P.; Nyman, M.; Nieminen, P.; O'Donnell, D.; Ollier, J.; Pakarinen, J.; Peura, P.; Pissulla, Th; Rahkila, P.; Revill, J. P.; Rother, W.; Ruotsalainen, P.; Rigby, S. V.; Sarn, J.; Sapple, P. J.; Scheck, M.; Scholey, C.; Simpson, J.; Sorri, J.; Uusitalo, J.; Venhart, M.

2013-03-01

55

Luminescence and photoinduced absorption in ytterbium-doped optical fibres  

SciTech Connect

Photochemical reactions induced in the glass network of an ytterbium-doped fibre core by IR laser pumping and UV irradiation have been investigated by analysing absorption and luminescence spectra. We have performed comparative studies of the photoinduced absorption and luminescence spectra of fibre preforms differing in core glass composition: Al{sub 2}O{sub 3} : SiO{sub 2}, Al{sub 2}O{sub 3} : Yb{sub 2}O{sub 3} : SiO{sub 2}, and P{sub 2}O{sub 5} : Yb{sub 2}O{sub 3} : SiO{sub 2}. The UV absorption spectra of unirradiated preform core samples show strong bands peaking at 5.1 and 6.5 eV, whose excitation plays a key role in photoinduced colour centre generation in the glass network. 'Direct' UV excitation of the 5.1- and 6.5-eV absorption bands at 244 and 193 nm leads to the reduction of some of the Yb{sup 3+} ions to Yb{sup 2+}. The photodarkening of ytterbium-doped fibres by IR pumping is shown to result from oxygen hole centre generation. A phenomenological model is proposed for the IR-pumping-induced photodarkening of ytterbium-doped fibres. The model predicts that colour centre generation in the core glass network and the associated absorption in the visible range result from a cooperative effect involving simultaneous excitation of a cluster composed of several closely spaced Yb{sup 3+} ions.

Rybaltovsky, A A; Aleshkina, S S; Likhachev, M E; Bubnov, M M; Umnikov, A A; Yashkov, M V; Gur'yanov, Aleksei N; Dianov, Evgenii M

2011-12-31

56

Synthesis of nanocrystalline ytterbium modified PbTiO3  

NASA Astrophysics Data System (ADS)

Ytterbium (Yb) modified lead titanate ceramics (Pb1-xYbx TiO3, with x=0.05) (PYbT) were prepared by the Pechini method. The materials were calcinated under flowing oxygen at different temperatures from 300C to 700C. Nanostructured PYbT was obtained by high-energy milling and investigated using X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and surface area analysis (BET). The results revealed that the obtained materials are formed by nanometric particles.

Lemos, F. C. D.; Longo, E.; Leite, E. R.; Melo, D. M. A.; Silva, A. O.

2004-04-01

57

Atomic Mass and Nuclear Binding Energy for Yb-221 (Ytterbium)  

NASA Astrophysics Data System (ADS)

This document is part of the Supplement containing the complete sets of data of Subvolume B `Nuclei with Z = 55 - 100' of Volume 22 `Nuclear Binding Energies and Atomic Masses' of Landolt-Brnstein - Group I `Elementary Particles, Nuclei and Atoms', and additionally including data for nuclei with Z = 101 - 130. It provides atomic mass, mass excess, nuclear binding energy, nucleon separation energies, Q-values, and nucleon residual interaction parameters for atomic nuclei of the isotope Yb-221 (Ytterbium, atomic number Z = 70, mass number A = 221).

Sukhoruchkin, S. I.; Soroko, Z. N.

58

Paramagnetic Faraday rotation with spin-polarized ytterbium atoms  

NASA Astrophysics Data System (ADS)

We report the observation of paramagnetic Faraday rotation of spin-polarized ytterbium (Yb) atoms. As the atomic samples, we used an atomic beam, released atoms from a magneto-optical trap (MOT), and trapped atoms in a far-off-resonant trap (FORT). Since Yb is diamagnetic and includes a spin-1/2 isotope, it is an ideal sample for spin physics, such as quantum non-demolition measurement of spin (spin QND), for example. From the results of the rotation angle, we confirmed that the atoms were almost perfectly polarized.

Takeuchi, M.; Takano, T.; Ichihara, S.; Takasu, Y.; Kumakura, M.; Yabuzaki, T.; Takahashi, Y.

2006-04-01

59

42 CFR 411.175 - Basis for Medicare primary payments.  

Code of Federal Regulations, 2012 CFR

... 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...

2012-10-01

60

27 CFR 22.175 - Discontinuance of use.  

Code of Federal Regulations, 2013 CFR

...Section 22.175 Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND TRADE BUREAU, DEPARTMENT OF THE TREASURY ALCOHOL DISTRIBUTION AND USE OF TAX-FREE...Spirits by the United States or Government Agency § 22.175...

2013-04-01

61

27 CFR 25.175 - Prepayment of tax.  

Code of Federal Regulations, 2013 CFR

...175 Section 25.175 Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND TRADE...DEPARTMENT OF THE TREASURY ALCOHOL BEER Tax on Beer Prepayment...on beer to be removed for consumption or sale, or if a...

2013-04-01

62

27 CFR 53.175 - Readjustment for local advertising charges.  

Code of Federal Regulations, 2013 CFR

...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...

2013-04-01

63

40 CFR 180.175 - Maleic hydrazide; tolerances for residues.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Maleic hydrazide; tolerances for residues. 180.175...Specific Tolerances § 180.175 Maleic hydrazide; tolerances for residues. (a) General...the herbicide and plant regulator maleic hydrazide...

2010-07-01

64

40 CFR 180.175 - Maleic hydrazide; tolerances for residues.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 false Maleic hydrazide; tolerances for residues. 180.175...Specific Tolerances § 180.175 Maleic hydrazide; tolerances for residues. (a) General...the herbicide and plant regulator maleic hydrazide...

2009-07-01

65

Quantum degenerate mixture of ytterbium and lithium atoms  

NASA Astrophysics Data System (ADS)

We have produced a quantum degenerate mixture of fermionic alkali-metal 6Li and bosonic spin-singlet 174Yb gases. This was achieved using sympathetic cooling of lithium atoms by evaporatively cooled ytterbium atoms in a far-off-resonant optical dipole trap. We observe the coexistence of Bose-condensed (T/Tc?0.8) 174Yb with 2.3104 atoms and Fermi degenerate (T/TF?0.3) 6Li with 1.2104 atoms. Quasipure Bose-Einstein condensates of up to 3104 174Yb atoms can be produced in single-species experiments. Our results mark a significant step toward studies of few- and many-body physics with mixtures of alkali-metal and alkaline-earth-metal-like atoms, and for the production of paramagnetic polar molecules in the quantum regime. Our methods also establish a convenient scheme for producing quantum degenerate ytterbium atoms in a 1064 nm optical dipole trap.

Hansen, Anders H.; Khramov, Alexander; Dowd, William H.; Jamison, Alan O.; Ivanov, Vladyslav V.; Gupta, Subhadeep

2011-07-01

66

Quantum degenerate mixture of ytterbium and lithium atoms  

SciTech Connect

We have produced a quantum degenerate mixture of fermionic alkali-metal {sup 6}Li and bosonic spin-singlet {sup 174}Yb gases. This was achieved using sympathetic cooling of lithium atoms by evaporatively cooled ytterbium atoms in a far-off-resonant optical dipole trap. We observe the coexistence of Bose-condensed (T/T{sub c}{approx_equal}0.8) {sup 174}Yb with 2.3x10{sup 4} atoms and Fermi degenerate (T/T{sub F}{approx_equal}0.3) {sup 6}Li with 1.2x10{sup 4} atoms. Quasipure Bose-Einstein condensates of up to 3x10{sup 4} {sup 174}Yb atoms can be produced in single-species experiments. Our results mark a significant step toward studies of few- and many-body physics with mixtures of alkali-metal and alkaline-earth-metal-like atoms, and for the production of paramagnetic polar molecules in the quantum regime. Our methods also establish a convenient scheme for producing quantum degenerate ytterbium atoms in a 1064 nm optical dipole trap.

Hansen, Anders H.; Khramov, Alexander; Dowd, William H.; Jamison, Alan O.; Ivanov, Vladyslav V.; Gupta, Subhadeep [Department of Physics, University of Washington, Seattle, Washington 98195 (United States)

2011-07-15

67

7 CFR 1427.175 - Liability of the producer.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Liability of the producer. 1427.175 Section 1427.175 Agriculture...Cotton Loans § 1427.175 Liability of the producer. (a)(1) If a producer makes any fraudulent representation in...

2013-01-01

68

46 CFR 175.120 - Vessels on an international voyage.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Vessels on an international voyage. 175.120 Section 175...PROVISIONS § 175.120 Vessels on an international voyage. A mechanically propelled...carries more than 12 passengers on an international voyage must comply with the...

2011-10-01

69

13 CFR 120.175 - Coastal barrier islands.  

Code of Federal Regulations, 2012 CFR

... 2012-01-01 2012-01-01 false Coastal barrier islands. 120.175 Section 120.175 Business Credit and Assistance...Under Other Laws and Orders § 120.175 Coastal barrier islands. SBA and Intermediaries may not make or guarantee any...

2012-01-01

70

40 CFR 63.175 - Quality improvement program for valves.  

Code of Federal Regulations, 2013 CFR

...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...

2013-07-01

71

Neutron study of magnetic structures and excitations in cerium monochalcogenides and ytterbium monopnictides.  

National Technical Information Service (NTIS)

Elastic magnetic, diffuse critical and inelastic neutron scattering experiments were performed to systematically study static and dynamic magnetic properties of cerium monochalcogenide and ytterbium monopnictide compounds. For CeS and CeSe the second-orde...

A. W. Doenni

1991-01-01

72

Enantioselective synthesis of 3-hydroxy oxindoles by ytterbium-catalysed decarboxylative addition of ?-ketoacids to isatins.  

PubMed

A ytterbium(iii)-indapybox catalysed enantioselective decarboxylative addition reaction of ?-ketoacids to isatins is described. The biologically important 3-hydroxy oxindoles were obtained in high yields and excellent enantioselectivities. PMID:23979548

Duan, Zhiqiang; Han, Jianlin; Qian, Ping; Zhang, Zirui; Wang, Yi; Pan, Yi

2013-08-27

73

Effect of different gain medium length in Brillouin Erbium-Ytterbium Doped Fiber Laser  

Microsoft Academic Search

This paper presents properties and characterizations of different Erbium-Ytterbium doped fiber (EYDF) lengths in Brillouin Erbium-Ytterbium Doped Fiber Laser (BEYDFL) system. BEYDFL systems have the potential to become multi-channel source in Dense Wavelength Division Multiplexing (DWDM) system. BEYDFL is a unique laser source that can produces multiple channels simultaneously with dense and constant channel line spacing of about 0.08 nm.

Nurul Shahrizan Shahabuddin; Wee Teng Yeo; Harinderjit Kaur; Azin Adamiat; H. A. A. Rashid; Zulfadzli Yusoff

2010-01-01

74

Thermal bleaching of photodarkening in ytterbium-doped fibers  

NASA Astrophysics Data System (ADS)

We study thermal bleaching of photodarkening-induced loss in ytterbium-doped fibers. Post-irradiation heating of a photodarkened fiber is shown to result in further increase the loss which is attributed to both a permanent increase of loss-inducing color centers and a temperature-dependent broadening of the absorption spectrum. The permanent heat-induced increase of loss is believed to indicate presence of an intermediate energy state in the NIRpho tochemical mechanism for photodarkening. Further, we apply the demarcation energy curve approach to derive the thermal activation energy of the induced defects. For the studied commercial 20-?m-core-diameter LMA fiber, the energy distribution consists of a single peak, located at 1.3 eV with a FWHM of 0.31 eV.

Sderlund, Mikko J.; Montiel I Ponsoda, Joan J.; Koplow, Jeffrey P.; Honkanen, Seppo

2010-02-01

75

Atomic layer deposition for fabrication of ytterbium doped fibers  

NASA Astrophysics Data System (ADS)

Atomic layer deposition (ALD) was used to fabricate an ytterbium (Yb)-doped silica fiber in combination with the conventional modified chemical vapor deposition (MCVD) method. An MCVD soot-preform with a porous layer of SiO2 doped with GeO2 was coated with layers of Yb2O3 and Al2O3 prior to sintering, using the ALD method. ALD is a surface controlled CVD-type process enabling thin film deposition over large substrates with good thickness control, uniformity and high conformality. A materials analysis study showed that the dopants successfully penetrated the full thickness of 320 ?m of the soot layer. Preliminary preform and fiber experiments on refractive index profiles, background losses, lifetime and the characteristic gain-loss curve were performed demonstrating the potential of this method for fabricating Yb-doped fibers with high concentration of dopants.

Montiel I Ponsoda, Joan J.; Norin, Lars; Bosund, Markus; Ye, Changgeng; Sderlund, Mikko J.; Tervonen, Ari; Honkanen, Seppo

2012-02-01

76

Calculation of electron scattering from the ground state of ytterbium  

SciTech Connect

We report on the application of the convergent close-coupling method, in both relativistic and nonrelativistic formulations, to electron scattering from ytterbium. Angle-differential and integrated cross sections are presented for elastic scattering and excitation of the states (6s6p){sup 3}P{sub 0,1,2}, (6s6p){sup 1}P{sub 1}{sup o}, (6s7p){sup 1}P{sub 1}{sup o}, and (6s5d){sup 1}D{sub 2}{sup e} for a range of incident electron energies. We also present calculations of the total cross section, and angle-differential Stokes parameters for excitation of the (6s6p){sup 3}P{sub 1}{sup o} state from the ground state. A comparison is made with the relativistic distorted-wave method and experiments.

Bostock, Christopher J.; Fursa, Dmitry V.; Bray, Igor [ARC Centre for Antimatter-Matter Studies, Curtin University, GPO Box U1987, Perth, WA 6845 (Australia)

2011-05-15

77

Structural and Electronic Transitions in Ytterbium Metal to 202 GPa  

SciTech Connect

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}

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

1999-02-01

78

Solid state reactions of nanocrystalline Ce0.5Yb0.5O1.75 mixed oxide with high surface area silica in oxidizing and reducing atmosphere  

NASA Astrophysics Data System (ADS)

The interaction of nanocrystalline Ce0.5Yb0.5O1.75 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 Ce0.5Yb0.5O1.75-SiO2 system shows very high structural and size stability in the oxidizing atmosphere up to 1000 C, but in hydrogen spreading of the oxide onto silica occurs at temperatures above 800 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-Y2Si2O7 (yttrialite), has been identified in the samples containing the mixed Ce-Yb oxide. The absence of y-Yb2Si2O7 silicate in the Yb2O3-SiO2 samples treated in similar conditions indicates that Ce4+ ions are needed to stabilize the structure.

Ma?ecka, Ma?gorzata A.; K?pi?ski, Leszek

2012-08-01

79

Precision Atomic Masses of Calcium, Strontium and Ytterbium  

NASA Astrophysics Data System (ADS)

Currently the second most precise value for the fine structure constant is derived from ``photon-recoil'' measurements of h/M(Rb) combined with the Rydberg constant, atomic transition frequencies, and the atomic masses of the electron and rubidium. An improved photon-recoil value for alpha will enable the combination of theory and experiment for the g-factor of the electron, which produces the most precise value for alpha, to provide an improved test of QED. Besides the alkalis, isotopes of the alkaline-earths and ytterbium can make promising candidates for precise photon-recoil measurements of h/M(atom). In addition, the mass of 40Ca is required for obtaining the g-factor of hydrogen-like calcium from measurements of electron spin-flip and cyclotron frequencies of Ca19+, which would provide a test of bound-state QED theory. For these and other applications, we have now measured cyclotron frequency ratios of pairs of ions in a cryogenic Penning trap that should yield the atomic masses of 40Ca, 86,87,88Sr, and 170,171,172,173,174,176Yb to a precision of 0.2 ppb.

Myers, Edmund; Rana, Raman; Hoecker, Martin

2012-06-01

80

Parity violation in atomic ytterbium: Experimental sensitivity and systematics  

SciTech Connect

We present a detailed description of the observation of parity violation in the {sup 1}S{sub 0}-{sup 3}D{sub 1} 408-nm forbidden transition of ytterbium, a brief report of which appeared earlier. Linearly polarized 408-nm light interacts with Yb atoms in crossed E and B fields. The probability of the 408-nm transition contains a parity-violating term, proportional to ({center_dot}B)[(Ex){center_dot}B], arising from interference between the parity-violating amplitude and the Stark amplitude due to the E field ( is the electric field of the light). The transition probability is detected by measuring the population of the {sup 3}P{sub 0} state, to which 65% of the atoms excited to the {sup 3}D{sub 1} state spontaneously decay. The population of the {sup 3}P{sub 0} state is determined by resonantly exciting the atoms with 649-nm light to the 6s7s {sup 3}S{sub 1} state and collecting the fluorescence resulting from its decay. Systematic corrections due to E-field and B-field imperfections are determined in auxiliary experiments. The statistical uncertainty is dominated by parasitic frequency excursions of the 408-nm excitation light due to the imperfect stabilization of the optical reference with respect to the atomic resonance. The present uncertainties are 9% statistical and 8% systematic. Methods of improving the accuracy for future experiments are discussed.

Tsigutkin, K.; Dounas-Frazer, D.; Family, A.; Stalnaker, J. E. [Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300 (United States); Yashchuk, V. V. [Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Budker, D. [Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2010-03-15

81

Ultracold Mixtures and Molecules from Ytterbium and Lithium  

NASA Astrophysics Data System (ADS)

Ultracold mixtures composed of different atomic species offer unique opportunities for probing few and many-body physics, including studies of mass-mismatched Efimov physics, impurity probes of superfluid properties, and mass-imbalanced interactions. Furthermore, the possibility of producing heteronuclear, polar molecules through field-induced scattering resonances enables a large set of experiments involving dipolar quantum matter and tests of fundamental physics. We outline our experimental setup and techniques to synthesize molecules from ultracold gases of atomic lithium and ytterbium. We report on the production of a stable mixture of ^6Li and ^174Yb confined in a common far-off-resonant optical trap. Through studies of inter-species thermalization rates, we have extracted the s-wave scattering length |a^6Li-^174Yb|. Furthermore, through forced evaporation of ^174Yb, we have sympathetically cooled ^6Li to below the Fermi temperature. We will discuss experimental progress towards searches for inter-species Feshbach resonances, the synthesis of polar molecules, and studies of the BEC-BCS crossover in ^6Li using ^174Yb as an impurity probe.

Hansen, Anders; Khramov, Alexander; Dowd, William; Jamison, Alan; Ivanov, Vladyslav; Mnchow, Frank; Gupta, Subhadeep

2011-06-01

82

Multi-wavelength ytterbium doped fiber laser based on longitudinal mode interference  

NASA Astrophysics Data System (ADS)

Multi-wavelength Ytterbium-doped fiber laser (YDFL) is demonstrated using a longitudinal mode interference assisted by a four-wave mixing (FWM) effect in a ring laser cavity. The gain medium is a 16 m long of the fabricated (Ytterbium-doped fiber) YDF, which has a core composition of 0.8 wt % of Yb2O3, 1.8 wt % of Al2O3 and 23 wt % of GeO2, Ytterbium ion fluorescence lifetime of 1.1 ms and absorption of 9.0 dB/m at the pump wavelength of 976 nm. 20 m long photonic crystal fiber (PCF) is used to provide FWM effect so that the energy of different oscillating lines can be redistributed to improve multi-wavelength operation. The proposed laser generates 12 lines of optical comb with a line spacing of approximately 0.59 nm at 1035 nm region.

Shahabuddin, N. S.; Ismail, M. A.; Paul, M. C.; Damanhuri, S. S. A.; Harun, S. W.; Ahmad, H.; Pal, M.; Bhadra, S. K.

2011-11-01

83

Single crystal growth and physical properties of boron-rich ytterbium borosilicide  

Microsoft Academic Search

Ytterbium borosilicide YbB45.6Si1.0 crystals were successfully grown by the floating zone method. YbB45.6Si1.0 takes the recently discovered YB50-type structure and has an orthorhombic structure with lattice constants of a=16.636(4) , b=17.644(2) , c=9.488(2) . Other magnetic REB50-type compounds have been discovered to exhibit the first magnetic transitions found for B12 icosahedral compounds. The physical properties of ytterbium borosilicide were investigated

Takao Mori; Takaho Tanaka

2003-01-01

84

Valence changes in an ytterbium-aluminum alloy during autoionization and Auger-electron emission  

SciTech Connect

A valence change from f/sup 13/ to f/sup 14/ occurs in ytterbium atoms in a mixed-valent ytterbium-aluminum alloy during autoionization and Auger-electron emission. In both of these emission processes the 4f-shell occupancy increases when the shell becomes more tightly bound under the influence of the core hole. The quenching of the core hole, which terminates the process, occurs after the valence change, so that the f/sup 13/ initial state is not manifest in the spectra.

Egelhoff, W.F. Jr.; Tibbetts, G.G.

1980-02-18

85

40 CFR 415.175 - New source performance standards (NSPS).  

Code of Federal Regulations, 2012 CFR

...CONTINUED) EFFLUENT GUIDELINES AND STANDARDS INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY Sodium Dichromate and Sodium Sulfate Production Subcategory § 415.175 New source performance standards (NSPS). Any new...

2012-07-01

86

45 CFR 17.5 - Context to be reflected.  

Code of Federal Regulations, 2011 CFR

... 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, where...

2011-10-01

87

45 CFR 17.5 - Context to be reflected.  

Code of Federal Regulations, 2012 CFR

... 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, where...

2012-10-01

88

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

89

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

90

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

91

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

92

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

93

14 CFR 135.175 - Airborne weather radar equipment requirements.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Airborne weather radar equipment requirements. 135...and Equipment § 135.175 Airborne weather radar equipment requirements. ...passenger-carrying operations unless approved airborne weather radar equipment is installed in the...

2013-01-01

94

40 CFR 98.175 - Procedures for estimating missing data.  

Code of Federal Regulations, 2013 CFR

...Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Iron and Steel Production § 98.175 Procedures for estimating missing data. A complete record of all measured...

2013-07-01

95

40 CFR 60.175 - Monitoring of operations.  

Code of Federal Regulations, 2013 CFR

...PERFORMANCE FOR NEW STATIONARY SOURCES Standards of Performance for Primary Zinc Smelters § 60.175 Monitoring of operations. (a) The owner or operator of any primary zinc smelter subject to the provisions of this subpart shall install and...

2013-07-01

96

46 CFR 67.175 - Application for new vessel determination.  

Code of Federal Regulations, 2011 CFR

...Miscellaneous Applications § 67.175 Application for new vessel determination. (a) When a vessel has been constructed entirely of new materials, no application for a new vessel determination need be made under...

2011-10-01

97

49 CFR 175.20 - Compliance and training.  

Code of Federal Regulations, 2012 CFR

...Regulations § 175.20 Compliance and training. An air carrier may not transport a hazardous material by aircraft unless each of...subpart H of part 172 of this subchapter. In addition, air carriers must comply with all applicable...

2012-10-01

98

29 CFR 1952.175 - Changes to approved plans.  

Code of Federal Regulations, 2013 CFR

...FOR ENFORCEMENT OF STATE STANDARDS California § 1952.175 Changes to approved...with part 1953 of this chapter, the California carcinogen program implemented on... (b) On January 1, 1978, the California Department of Industrial...

2013-07-01

99

40 CFR 46.175 - Terms and conditions.  

Code of Federal Regulations, 2013 CFR

...AND OTHER FEDERAL ASSISTANCE FELLOWSHIPS Award § 46.175 Terms and... (a) If EPA awards you a fellowship on the basis of a nomination...government employer, by accepting the fellowship agreement you agree to...

2013-07-01

100

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

101

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

102

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

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.

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

103

Femtosecond soliton mode-locked laser based on ytterbium-doped photonic bandgap fiber.  

PubMed

We demonstrate a solid-core ytterbium-doped photonic bandgap fiber laser passively mode-locked with a semiconductor saturable absorber. Gain and anomalous dispersion simultaneously provided by the photonic crystal fiber allow for an all-fiber subpicosecond soliton oscillator. We also discuss the effect of higher-order dispersion in photonic bandgap fiber on laser performance. PMID:19529305

Isomki, A; Okhotnikov, Oleg G

2006-10-01

104

Second harmonic generation of spectrally broadened femtosecond ytterbium laser radiation in a gas-filled capillary  

SciTech Connect

A 300-fs radiation pulse of an ytterbium laser with a wavelength of 1030 nm and energy of 150 {mu}J were converted to a 15-fs pulse with a wavelength of 515 nm by broadening the emission spectrum in a capillary filled with xenon and by generating the second harmonic in a KDP crystal. The energy efficiency of the conversion was 30 %.

Didenko, N V; Konyashchenko, Aleksandr V; Kostryukov, P V; Losev, Leonid L; Tenyakov, S Yu

2011-09-30

105

A novel method to measure the isotope shifts and hyperfine splittings of all ytterbium isotopes for a 399-nm transition  

NASA Astrophysics Data System (ADS)

We report the experimental results on measuring the isotope shifts and hyperfine splittings of all ytterbium isotopes for a 399-nm transition by using a quite simple and novel method. It benefits from the advantages of the modulation transfer spectroscopy in an ytterbium hollow cathode lamp and the Doppler-free spectroscopy in a collimated ytterbium atomic beam. The key technique in this experiment is simultaneously measuring the frequency separations of the two spectra twice, and the separation difference between two measurements is solely determined by the well-defined frequency of an acousto-optics modulator. Compared with the most of previously reported experimental results, ours are more accurate and completed, which will provide the useful information for developing a more accurate theoretical model to describe the interaction inside an ytterbium atom.

Wang, Wen-Li; Xu, Xin-Ye

2010-12-01

106

Highly efficient cladding-pumped fibre laser based on an ytterbium-doped optical fibre and a fibre Bragg grating  

SciTech Connect

Ytterbium-ion-doped double-clad optical fibres were developed. The differential quantum efficiency of a diode-pumped fibre laser, fabricated on the basis of such optical fibres with a fibre Bragg grating, was 90%. (lasers)

Kurkov, Andrei S; Karpov, V I; Medvedkov, O I; Dianov, Evgenii M; Vasil'ev, Sergei A; Paramonov, Vladimir M; Protopopov, V N [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation); Laptev, A Yu; Gur'yanov, A N; Umnikov, A A; Vechkanov, N I [Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhnii Novgorod (Russian Federation); Artyushenko, V G; Frahm, J [Advanced Photonic Systems, APhS GmbH, Berlin (Germany)

1999-06-30

107

Preventing photodarkening in ytterbium-doped high power fiber lasers; correlation to the UV-transparency of the core glass.  

PubMed

Photodarkening experiments are performed on ytterbium-doped silicate glass samples. A strong charge-transfer (CT) absorption band near 230nm in aluminosilicate glass is found to be correlated to the mechanism of induced color center formation. Excitation into the CT-absorption band generates similar color centers as observed in ytterbium-doped fiber lasers under 915nm high power diode pumping. The position of the CT-absorption band is compositional dependent and is shifted to shorter wavelengths in ytterbium doped phosphosilicate glass. Very low levels of photodarkening is observed for the ytterbium doped phosphosilicate glass composition under 915nm high power diode pumping. Possible excitation routes to reach the CT-absorption band under 915nm pumping are discussed. PMID:18542200

Engholm, M; Norin, L

2008-01-21

108

Atomic Mass and Nuclear Binding Energy for La-175 (Lanthanum)  

NASA Astrophysics Data System (ADS)

This document is part of the Supplement containing the complete sets of data of Subvolume B `Nuclei with Z = 55 - 100' of Volume 22 `Nuclear Binding Energies and Atomic Masses' of Landolt-Brnstein - Group I `Elementary Particles, Nuclei and Atoms', and additionally including data for nuclei with Z = 101 - 130. It provides atomic mass, mass excess, nuclear binding energy, nucleon separation energies, Q-values, and nucleon residual interaction parameters for atomic nuclei of the isotope La-175 (Lanthanum, atomic number Z = 57, mass number A = 175).

Sukhoruchkin, S. I.; Soroko, Z. N.

109

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

Microsoft Academic Search

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

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

2010-01-01

110

Synthesis of a Crystalline Hydrated Basic Ytterbium Carbonate, Yb2O3 2.17CO2 6.17H2O  

Microsoft Academic Search

Crystalline ytterbium carbonate, Yb2O3 2.17CO2 6.17 H2O, was synthesized using ammonium bicarbonate as precipitant. The results of chemical analyses suggest that the ytterbium carbonate synthesized is a hydrated basic carbonate or oxycarbonate. X-ray power diffraction data are given. The IR data for this ytterbium carbonate show the presence of two different carbonate groups. There is no stable intermediate

Liu Song; Ma Rongjun

1997-01-01

111

175. View of the Pinnacle Lake Over look. Example of ...  

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

175. View of the Pinnacle Lake Over look. Example of location where designers placed an overlook on the outside of a curve instead of leaving the remnants of a rock cut visible. View to the south. - Blue Ridge Parkway, Between Shenandoah National Park & Great Smoky Mountains, Asheville, Buncombe County, NC

112

Study on Sup(175,176)Lu Resonance Parameters.  

National Technical Information Service (NTIS)

The transmission was measured of the sup(175,176)Lu isotope samples using a mechanical neutron selector in the energy range of 0.01-200 eV. The time-of-flight method was used. Presented are the parameters of neutron resonances, calculated by the methods o...

T. S. Belanova A. G. Kolesov V. A. Poruchikov V. A. Safonov S. M. Kalebin

1978-01-01

113

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

114

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

115

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

116

7 CFR 1427.175 - Liability of the producer.  

Code of Federal Regulations, 2012 CFR

...AGRICULTURE LOANS, PURCHASES, AND OTHER OPERATIONS COTTON Recourse Seed Cotton Loans § 1427.175 Liability of the producer...acquired by CCC shall be equal to the sales price of the cotton less any costs incurred by CCC in completing...

2012-01-01

117

Hybrid Ytterbium-doped large-mode-area photonic crystal fiber amplifier for long wavelengths.  

PubMed

A large-mode-area Ytterbium-doped photonic crystal fiber amplifier with build-in gain shaping is presented. The fiber cladding consists of a hexagonal lattice of air holes, where three rows are replaced with circular high-index inclusions. Seven missing air holes define the large-mode-area core. Light confinement is achieved by combined index and bandgap guiding, which allows for single-mode operation and gain shaping through distributed spectral filtering of amplified spontaneous emission. The fiber properties are ideal for amplification in the long wavelength regime of the Ytterbium gain spectrum above 1100 nm, and red shifting of the maximum gain to 1130 nm is demonstrated. PMID:22418478

Petersen, Sidsel R; Alkeskjold, Thomas T; Poli, Federica; Coscelli, Enrico; Jrgensen, Mette M; Laurila, Marko; Lgsgaard, Jesper; Broeng, Jes

2012-03-12

118

Effect of copper and ytterbium dopants on scintillation properties of bismuth orthogermanate  

SciTech Connect

Crystalline bismuth orthogermanate Bi{sub 4}Ge{sub 3}O{sub 12} (BGO), which exhibits bright blue-green radioluminescence, is a promising nonhygroscopic scintillation material. Attempts to stabilize the optical quality and radiation resistance of BGO crystals by introducing stabilizers were unsuccessful because the stabilizers usually decrease the scintillation yield. Four systematic search for dopants that would stabilize the scintillation yield and the radiation resistance of BGO scintillators revealed that copper and ytterbium ions are suitable for this purpose. In this paper, we report the results of these studies. Introduction of ytterbium or copper increases the radiation resistance and does not affect the scintillation yield (for Cu{sup 2+}, the light yield increases by 5-12%) and decay time of BGO crystals. For bismuth aluminate crystals (Bi{sub 2}Al{sub 4}O{sub 9}), we detected two components of scintillation pulses with 25 and 155 ns durations.

Buzmakova, S.I.; Shul`gin, B.V.; Viktorov, L.V.; Podurovskii, S.V. [Ural State Technical Univ., Ekaterinburg (Russian Federation); Kargin, Yu.F.; Skorikov, V.M.; Volkov, V.V. [Kurnakov Institute of General and Inorganic Chemistry, Moscow (Russian Federation)

1994-12-01

119

ACTIVE MEDIA: New ytterbium-phosphate glass for diode-pumped lasers  

NASA Astrophysics Data System (ADS)

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 51020 cm-3 is synthesised. Active laser elements 552 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 ~150 fs and a peak power of about 5 kW are obtained in the passive mode-locking regime.

Galagan, B. I.; Glushchenko, I. N.; Denker, B. I.; Kisel', V. E.; Kuril'chik, S. V.; Kuleshov, N. V.; Sverchkov, S. E.

2009-10-01

120

Stress Measurements in Shock-Loaded PBX 9501 with Embedded Longitudinal and Lateral Piezoresistive Ytterbium Gauges  

SciTech Connect

A series of light gas gun impact experiments were performed with piezoresistive ytterbium (Yb) gauges in longitudinal and lateral orientations embedded in the plastic bonded explosive PBX 9501. These experiments were performed to evaluate the feasibility of using this method to measure lateral stresses and shear strength dynamically in PBX 9501. Ytterbium was chosen as a gauge material based on its high piezoresistance changes at low stress levels. Experiments were performed at longitudinal impact stresses of approximately 0.6 GPa, which is above the yield point of Yb, near the dynamic yield point of PBX 9501, at a level that is comparable with other impact data, and relevant to several multidimensional safety tests. Results show that PBX 9501 does maintain strength throughout compression. Because of poor reproducibility observed in the experiments presented, it appears unlikely that stress extraction from these gauge results would yield an estimate of shear strength at this impact stress with acceptable error.

D.E. Hooks

2004-12-15

121

Ytterbium-porphyrins as a new class of the luminescent labels  

NASA Astrophysics Data System (ADS)

New complexes of ytterbium with asymmetric porphyrins containing substituents in ?-positions and hydrophobic meso-(monophenyl-p-oxypropyl)triphenylporphyrin (OPP) were obtained and characterized by elemental analysis, IR, UV-Vis absorption and luminescence spectroscopy. Electronic absorption, luminescence and luminescence excitation spectra of these complexes were studied at 295 K in DMF solutions and in the water-lecithin medium. The 4f-luminescence of ytterbium-porphyrins in the near infrared (IR) spectral region (?max = 980 nm) is observed under excitation in Soret band (400-430 nm). The effect of substituent in porphyrin macroring on the 4f-luminescent properties was also investigated. The conjugates of these compounds with protein molecules - bovine serum albumin (BSA) were investigated as well. These compounds are interesting at the initial stage of diagnostics of tumor tissues as IR-luminescent probes due to their spectral-luminescent characteristics and some biochemical properties.

Tsvirko, M.; Korovin, Yu; Rusakova, N.

2007-08-01

122

Highly efficient 750 W tapered double-clad ytterbium fiber laser.  

PubMed

The results of theoretical and experimental studies of active tapered double-clad fibers, intending the optimization of its imperative parameters--tapering ratio, longitudinal profile, core/cladding diameters ratio, are presented. Using a refined taper geometry we have demonstrated power scaling of a ytterbium fiber laser pumped by low-brightness, cost-effective laser diodes up to 750 W, with 80% efficiency. PMID:20588376

Filippov, Valery; Kerttula, Juho; Chamorovskii, Yuri; Golant, Konstantin; Okhotnikov, Oleg G

2010-06-01

123

Efficient ytterbium triflate catalyzed microwave-assisted synthesis of 3-acylacrylic acid building blocks.  

PubMed

The derivatives of 4-(hetero)aryl-4-oxobut-2-enoic acid are useful as building blocks in the synthesis of biologically active compounds. An efficient general protocol for the synthesis of these building blocks was developed. This method combines microwave assistance and ytterbium triflate catalyst and allows the fast preparation of the target acids starting from different (hetero)aromatic ketones and glyoxylic acid monohydrate giving pure products in 52-75% isolated yields. PMID:18715040

Tolstoluzhsky, Nikita V; Gorobets, Nikolay Yu; Kolos, Nadezhda N; Desenko, Sergey M

2008-08-21

124

Simultaneous Extraction and Determination of Ytterbium and Cobalt Ethylenediaminetetraacetate Complex in Feces  

Microsoft Academic Search

A method is described for preparation of samples of bovine feces for analysis of ytterbium and cobalt ethylenediamine- tetraacetate complex. Two hundred milli- grams of feces was placed into a 50-ml screwcap polypropylene centrifuge tube. Twenty milliliters of .05 M ethylene- diaminetetraacetic acid solution in .05% potassium chloride with pH adjusted to 6.5 with ammonium hydroxide was added to feces

Steven P. Hart; Carl E. Polan

1984-01-01

125

On the role of cerium in a chromium-ytterbium-erbium phosphate glass  

SciTech Connect

The influence of cerium oxide on photo- and gamma-stability of chromium-ytterbium-erbium phosphate glasses is studied. It is found that UV irradiation does not cause any noticeable changes in the glass independently of the presence of cerium. Gamma rays produce colour centres in glasses without cerium and their lasing properties deteriorate. Doping glasses with an optimum amount of cerium oxide improves their radiation resistance with respect to gamma rays. (active media)

Byshevskaya-Konopko, Lyudmila O; Izyneev, A A; Sadovskii, Pavel I [Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow Region (Russian Federation); Pavlov, Yu S [State Scientific Centre of Russian Federation 'L.Ya. Karpov Institute of Physical Chemistry', Moscow (Russian Federation)

2000-09-30

126

Highly ytterbium-doped silica fibers with low photo-darkening.  

PubMed

Phosphorus co-doping is known to reduce clustering levels of rare earth ions in silica hosts. In this paper, ytterbium-doped silica fibers with approximately 8.9 wt% Yb(2)O(3), up to approximately 4700 dB/m peak core absorption at 976 nm, and low photo-darkening are demonstrated using high phosphorus co-doping. Measured gain as high as approximately 7 dB/cm is demonstrated in the fiber. PMID:19506642

Suzuki, Shigeru; McKay, Hugh A; Peng, Xiang; Fu, Libin; Dong, Liang

2009-06-01

127

XAFS study on the trace amounts of ytterbium ions incorporated in calcium carbonate crystal  

Microsoft Academic Search

We measured XAFS spectra of trace amount of ytterbium (Yb) incorporated in calcite, a stable phase of calcium carbonate. Calcium carbonate was precipitated from a mixed solution of CaCl2 aq and NaHCO3 aq with a given amount of YbCl3. Concentrations of Yb were 5?mol kg?1 in the starting solutions and Yb\\/Ca molar ratio in the precipitated calcium carbonate was 1.2?10?3.

H. Tsuno; H. Kagi; Y. Takahashi; T. Akagi; M. Nomura

2005-01-01

128

An all fibre ring cavity watt-level erbium ytterbium co-doped fibre laser  

Microsoft Academic Search

An erbium-ytterbium co-doped fibre ring laser pumped by a 976 nm laser diode array is presented. The laser power reaches 1.07 W at 1565.8 nm under 3.5 W pump power, with an optical conversion efficiency of 30.6%. The optimal output splitting ratio is demonstrated to be 99%. Stable output with a fine-shaped laser spectrum is achieved, although no wavelength selecting

Sheng-Ping Chen; Yi-Gang Li; Jian-Ping Zhu; Hua Wang; Yun Zhang; Tuan-Wei Xu; Ru Guo; Ke-Cheng Lu

2005-01-01

129

Ytterbium-Doping Related Stresses in Preforms for High-Power Fiber Lasers  

Microsoft Academic Search

Frozen-in mechanical stresses can significantly influence the optical and mechanical properties of optical fibers, especially in laser fibers for high-power operation. In the following, we will report on the polarimetric measurement of stresses induced by the spatially varying doping composition in fiber preforms. We investigated the effect of rare-earth laser ions and found that the dopant ytterbium generates higher stresses

Florian Just; Hans-Rainer Muller; Sonja Unger; Johannes Kirchhof; Volker Reichel; Hartmut Bartelt

2009-01-01

130

Optical dipole force trapping of a fermion-boson mixture of ytterbium isotopes  

NASA Astrophysics Data System (ADS)

We have succeeded in simultaneously trapping a fermion and boson isotope pair of ytterbium (Yb) in a far off-resonant trap (FORT). We have found evidence of elastic cross collisions between fermions and bosons, and performed a successful sympathetic cooling of the fermions. We could also enhance the loading of the fermions 171Yb in the crossing region in a crossed FORT via cross collisions between the fermions 171Yb and the bosons 174Yb.

Honda, K.; Takasu, Y.; Kuwamoto, T.; Kumakura, M.; Takahashi, Y.; Yabuzaki, T.

2002-08-01

131

Novel stoichiometrically erbium-ytterbium cocrystalline complex exhibiting enhanced near-infrared luminescence.  

PubMed

Three beta-diketonate complexes of erbium and ytterbium, Er(HFA)3(TPPO)3, Yb(HFA)3(TPPO)3, and Er(1/2)Yb(1/)(2)(HFA)3(TPPO)2 (HFA = hexafluoroacetylacetonate, TPPO = triphenylphosphine oxide) are synthesized and structurally characterized, and their luminescent properties are examined in detail. Compared with monometallic complexes Er(HFA)3(TPPO)3 and Er(HFA)3(TPPO)3, the stoichiometrically Er-Yb cocrystalline complex Er(1/2)Yb(1/2)(HFA)3(TPPO)2 exhibits special indirect near-infrared (NIR) luminescence with the acceptor and sensitizer (donor) coexisting in a single crystal. Of interest is that the NIR luminescence of the erbium ion in Er(1/2)Yb(1/2)(HFA)3(TPPO)2 is significantly enhanced because of the coexistence of the ytterbium ion through the energy-transfer between the ytterbium and erbium ions. The estimated donor-acceptor energy-transfer critical radii R(C,DA), obtained from the Frster model, are in good agreement with those determined from the single X-ray crystal structure, confirming the dipole-dipole character for such a Yb-Er energy-transfer process. PMID:16711704

Zhong, Qi; Wang, Huaishan; Qian, Guodong; Wang, Zhiyu; Zhang, Jiahua; Qiu, Jianrong; Wang, Minquan

2006-05-29

132

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.

133

Anomalous Microwave Emission from the H II Region RCW175  

NASA Astrophysics Data System (ADS)

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. The integrated flux density is 5.97 0.30 Jy at 31 GHz, in good agreement with the VSA. The 31 GHz flux density is 3.28 0.38 Jy (8.6?) 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 H II 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.

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

2009-01-01

134

21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.  

Code of Federal Regulations, 2010 CFR

...true Partial phosphoric acid esters of polyester resins. 175.260 Section 175.260...260 Partial phosphoric acid esters of polyester resins. Partial phosphoric acid esters of polyester resins identified in this section...

2010-01-01

135

21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.  

Code of Federal Regulations, 2010 CFR

...false Partial phosphoric acid esters of polyester resins. 175.260 Section 175.260...260 Partial phosphoric acid esters of polyester resins. Partial phosphoric acid esters of polyester resins identified in this section...

2009-04-01

136

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

Code of Federal Regulations, 2010 CFR

...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...

2009-04-01

137

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

Code of Federal Regulations, 2010 CFR

...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...

2010-04-01

138

21 CFR 175.360 - Vinylidene chloride copolymer coatings for nylon film.  

Code of Federal Regulations, 2010 CFR

...Vinylidene chloride copolymer coatings for nylon film. 175.360 Section 175.360...Vinylidene chloride copolymer coatings for nylon film. Vinylidene chloride copolymer...identified in this section and applied on nylon film may be safely used as...

2009-04-01

139

21 CFR 175.360 - Vinylidene chloride copolymer coatings for nylon film.  

Code of Federal Regulations, 2010 CFR

...Vinylidene chloride copolymer coatings for nylon film. 175.360 Section 175.360...Vinylidene chloride copolymer coatings for nylon film. Vinylidene chloride copolymer...identified in this section and applied on nylon film may be safely used as...

2010-01-01

140

21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.  

Code of Federal Regulations, 2011 CFR

...false Partial phosphoric acid esters of polyester resins. 175.260 Section 175.260...260 Partial phosphoric acid esters of polyester resins. Partial phosphoric acid esters of polyester resins identified in this section...

2013-04-01

141

49 CFR 175.501 - Special requirements for oxidizers and compressed oxygen.  

Code of Federal Regulations, 2012 CFR

...Special requirements for oxidizers and compressed oxygen. 175.501 Section 175.501 Transportation...Special requirements for oxidizers and compressed oxygen. (a) Compressed oxygen, when properly labeled Oxidizer or Oxygen,...

2012-10-01

142

40 CFR 267.175 - What special requirements must I meet for incompatible wastes?  

Code of Federal Regulations, 2012 CFR

...requirements must I meet for incompatible wastes? 267.175 Section 267.175...PROTECTION AGENCY (CONTINUED) SOLID WASTES (CONTINUED) STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS WASTE FACILITIES OPERATING UNDER A...

2012-07-01

143

19 CFR 175.24 - Publication following notice of desire to contest.  

Code of Federal Regulations, 2010 CFR

...2009-04-01 2009-04-01 false Publication following notice of desire to contest. 175.24...BY DOMESTIC INTERESTED PARTIES Procedure Following Petition § 175.24 Publication following notice of desire to contest....

2009-04-01

144

19 CFR 175.24 - Publication following notice of desire to contest.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Publication following notice of desire to contest. 175.24...BY DOMESTIC INTERESTED PARTIES Procedure Following Petition § 175.24 Publication following notice of desire to contest....

2010-04-01

145

49 CFR 175.700 - Special limitations and requirements for Class 7 materials.  

Code of Federal Regulations, 2011 CFR

...limitations and requirements for Class 7 materials. 175.700 Section 175.700...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY...

2011-10-01

146

25 CFR 170.175 - What Indian LTAP-sponsored transportation training and educational opportunities exist?  

Code of Federal Regulations, 2013 CFR

...transportation training and educational opportunities exist? 170.175 Section 170...Ltap-Sponsored Education and Training Opportunities § 170.175 What Indian LTAP-sponsored...transportation training and educational opportunities exist? There are many...

2013-04-01

147

Production of quantum-degenerate mixtures of ytterbium and lithium with controllable interspecies overlap  

NASA Astrophysics Data System (ADS)

Quantum-degenerate mixtures of one-electron and two-electron atoms form the starting point for studying few- and many-body physics of mass-imbalanced pairs as well as the production of paramagnetic polar molecules. We recently reported the achievement of dual-species quantum degeneracy of a mixture of lithium and ytterbium atoms. Here we present details of the key experimental steps for the all-optical preparation of these mixtures. Further, we demonstrate the use of the magnetic field gradient tool to compensate for the differential gravitational sag of the two species and control their spatial overlap.

Hansen, Anders H.; Khramov, Alexander Y.; Dowd, William H.; Jamison, Alan O.; Plotkin-Swing, Benjamin; Roy, Richard J.; Gupta, Subhadeep

2013-01-01

148

Single-Polarisation, Single-Frequency, 2 cm Ytterbium-Doped Fibre Laser  

SciTech Connect

A single-polarisation, single-frequency, ytterbium-doped silica fibre laser has been demonstrated in a 2 cm linear cavity. The output power reaches 35 mW with an optical signal-to-noise ratio greater than 65 dB. A polarisation-maintaining fibre Bragg grating is used as the polarisation-dependent reflector to generate the single-polarisation output with the polarisation extinction ratio greater than 20 dB. The laser works stably for two hours under laboratory conditions.

Guan, W.; Marciante, J.R.

2007-05-23

149

Combined photodarkening and thermal bleaching measurement of an ytterbium-doped fiber  

NASA Astrophysics Data System (ADS)

A combined photodarkening and thermal bleaching measurement of a large-mode-area (LMA) ytterbium-doped fiber (YDF) is presented. Photodarkened YDF sample is recovered to pre-photodarkened state by thermal annealing. As a result, this approach enables repeated measurements with the same sample and therefore eliminates uncertainties related to changing of the sample (such as sample length and splice losses). Additionally, our approach potentially improves the accuracy and repeatability of the photodarkening rate measurement, and also allows automation of the measurement procedure.

Montiel I Ponsoda, Joan J.; Sderlund, Mikko; Koplow, Jeffrey; Koponen, Joona; Iho, Aarni; Honkanen, Seppo

2009-02-01

150

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

SciTech Connect

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.

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

151

Optical excitation and decay dynamics of ytterbium atoms embedded in a solid neon matrix.  

SciTech Connect

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.

Xu, C.-Y.; Hu, S.-M.; Singh, J.; Bailey, K.; Lu, Z.-T.; Mueller, P.; O'Connor, T. P.; Welp, U. (Materials Science Division); ( PHY); (Univ. of Chicago); (Univ. of Science and Technology of China)

2011-09-01

152

Temporal evolution and correlation between cooperative luminescence and photodarkening in ytterbium doped silica fibers.  

PubMed

The present work describes photodarkening from the viewpoint of cooperative luminescence. The temporal evolution of both effects was measured simultaneously by means of ytterbium doped aluminosilicate fibers for concentrations up to 1.8 wt% Yb3+. The quadratic dependence of photodarkening and cooperative luminescence versus dopant concentration was observed. The change in the photodarkening and cooperative luminescence mutual dynamics for highly and low doped fibers is ascribed to a different ion number which forms the cluster. Cooperative luminescence is proved to be a natural probe for photodarkening since it provides new pieces of information and contributes to the photodarkening mechanism description. PMID:22273899

Gebavi, Hrvoje; Taccheo, Stefano; Milanese, Daniel; Monteville, Achille; Le Goffic, Olivier; Landais, David; Mechin, David; Tregoat, Denis; Cadier, Benoit; Robin, Thierry

2011-12-01

153

Experimental Investigation of High Power Erbium Ytterbium Co-doped Double Clad Fibre Laser  

NASA Astrophysics Data System (ADS)

All-fibre high power erbium-ytterbium co-doped double clad fibre lasers are proposed and demonstrated. By using different back-cavity mirrors, the different double clad fibre lasers are constructed. It is experimentally found that the output behaviour of laser can be controlled by a back-cavity mirror. The lower the reflectivity of the back-cavity mirror, the higher the output power and the high the slop efficiency. The maximum output power is about 1.6 W and the slop efficiency is 27.6%.

Li, Li-Jun; Feng, Xin-Huan; Liu, Yan-Ge; Li, Yao; Yuan, Shu-Zhong; Dong, Xiao-Yi

2004-12-01

154

46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.  

Code of Federal Regulations, 2010 CFR

...Shipping 1 2010-10-01 2010-10-01 false Alaska Peninsula, AK to Nunivak, AK. 7.175 Section 7.175 Shipping...THE PUBLIC BOUNDARY LINES Alaska § 7.175 Alaska Peninsula, AK to Nunivak, AK. (a) A line drawn from the...

2010-10-01

155

46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.  

Code of Federal Regulations, 2010 CFR

...Shipping 1 2009-10-01 2009-10-01 false Alaska Peninsula, AK to Nunivak, AK. 7.175 Section 7.175 Shipping...THE PUBLIC BOUNDARY LINES Alaska § 7.175 Alaska Peninsula, AK to Nunivak, AK. (a) A line drawn from the...

2009-10-01

156

Band Structures and Nucleon Alignments in ^173,175W  

NASA Astrophysics Data System (ADS)

Spectroscopic study of nuclei in the A180 region is essential to better understand regional relationships between Nilsson orbitals. Highly excited rotational states in both nuclei were populated at Argonne National Laboratory via a 230 MeV ^50Ti beam from the ATLAS accelerator incident on a ^128Te target. The Gammasphere array was used to detect ? decays from excited states. Rotational bands built on the level 1/2^-[521], p3/2 in ^173,175W have been extended to spins of 40 and 35 respectively, and bands built on the 7/2^+[633], i13/2 configuration extended to 38 and 27 respectively. New sidebands in ^173W have been observed in all previously-discovered bands. Alignments from i13/2 neutron and h11/2 proton crossings are consistent with predictions of Woods-Saxon cranking calculations. Experimental results and regional systematics will be presented.

Guess, C. J.; Tandel, S. K.; Chowdhury, P.; Shirwadkar, U.; Carpenter, M. P.; Janssens, R. V. F.; Khoo, T. L.; Lauritsen, T.; Lister, C. J.; Seweryniak, D.; Wang, X.; Zhu, S.; Hartley, D. J.

2012-10-01

157

Rotational bands and isomeric states in 175Lu  

SciTech Connect

Rotational bands in {sup 175}Lu have been extended through investigation with the (n,n{prime}{gamma}) reaction. Spallation neutrons bombarded Lu samples, and the resulting {gamma} rays were detected in a large-scale Compton-suppressed Ge detector array. Prompt- and delayed-{gamma}{gamma} coincidences have been used to extend most of the existing known bands, and to tentatively assign a new band, based on the 7/2{sup -}[523] configuration, from its band head to spin 13/2. The 3-quasiparticle K{sup {pi}} = 19/2{sup +} isomer is confirmed and its half life determined to be 984 {+-} 13(stat.) {+-} 30(sys.) {micro}s, in agreement with previous results.

Garrett, P E; Archer, D E; Becker, J A; Bernstein, L A; Hauschild, K; Henry, E A; McNabb, D P; Stoyer, M A; Younes, W; Johns, G D; Nelson, R O; Wilburn, W S

2003-10-15

158

Collisional perturbation of states in atomic ytterbium by helium and neon  

SciTech Connect

Results of an investigation of collisional deexcitation of the metastable 6s6p&hthinsp;{sup 3}P{sub 0} state in atomic ytterbium by helium and neon buffer gases are reported. We find upper limits for the quenching cross sections to be {sigma}{sub He}{lt}13{times}10{sup {minus}22}&hthinsp;cm{sup 2} and {sigma}{sub Ne}{lt}8{times}10{sup {minus}22}&hthinsp;cm{sup 2}. The small cross sections may allow an ytterbium parity nonconservation experiment to be performed in a vapor cell. We have also measured the pressure broadening and shift of the 6s6p&hthinsp;{sup 3}P{sub 0}{r_arrow}6s7s&hthinsp;{sup 3}S{sub 1} and 6s{sup 2}&hthinsp;{sup 1}S{sub 0}{r_arrow}6s6p&hthinsp;{sup 3}P{sub 1} transitions by helium and neon. {copyright} {ital 1999} {ital The American Physical Society}

Kimball, D.F.; Clyde, D.; Budker, D.; Freedman, S.J.; Rochester, S.; Stalnaker, J.E. [Physics Department, University of California at Berkeley, Berkeley, California 94720-7300 (United States); Budker, D.; Freedman, S.J. [Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); DeMille, D. [Physics Department, Yale University, New Haven, Connecticut 06520 (United States); Zolotorev, M. [Center for Beam Physics, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

1999-08-01

159

Ytterbium-doped all glass leakage channel fibers with highly fluorine-doped silica pump cladding.  

PubMed

All glass leakage channel fibers have been demonstrated to be a potential practical solution for power scaling in fiber lasers beyond the nonlinear limits in conventional large mode area fibers. The all glass nature with absence of any air holes is especially useful for allowing the fibers to be used and fabricated much like conventional fibers. Previously, double clad active all glass leakage channel fibers used low index polymer as a pump guide with the drawbacks of being less reliable at high pump powers and not being able to change fiber outer diameter independent of pump guide dimension. In this work, we demonstrate, for the first time, ytterbium-doped double clad all glass leakage channel fibers with highly fluorine-doped silica as pump cladding. The new all glass leakage channel fibers have no polymer in the pump path and have independent control of fiber outer diameters and pump cladding dimension, and, therefore, enable designs with smaller pump guide for high pump absorption and, at the same time, with large fiber diameters to minimize micro and macro bending effects, a much desired features for large core fibers where intermodal coupling can be an issue due to a much increased mode density. An ytterbium-doped double clad PM fiber with core diameter of 80 microm is also reported, which can be coiled in 76 cm diameter coils. PMID:19466146

Dong, Liang; McKay, Hugh A; Fu, Libin; Ohta, Michiharu; Marcinkevicius, Andrius; Suzuki, Shigeru; Fermann, Martin E

2009-05-25

160

All-fiber ytterbium soliton mode-locked laser with dispersion control by solid-core photonic bandgap fiber.  

PubMed

We exploit an anomalous dispersion generated by a solid-core photonic bandgap fiber for dispersion compensation in an ytterbium fiber laser passively mode-locked with a semiconductor saturable absorber. The bandgap-guiding fiber, adequately compatible with standard fiber based on guiding via total internal reflection, allows for an environmentally robust all-fiber subpicosecond soliton oscillator at 1 mum. PMID:19516589

Isomki, A; Okhotnikov, O G

2006-05-15

161

CONSTITUTION AND MAGNETIC SUSCEPTIBILITY OF THE VANADIUM-HYDROGEN SYSTEM. MAGNETIC PROPERTIES OF GADOLINIUM, EUROPIUM AND YTTERBIUM HYDRIDES  

Microsoft Academic Search

An x-ray study was made of the structure and phase relations in the ; vanadium--hydrogen system, and the magnetic susceptibilities of these alloys were ; also determined. The magnetic behavior of europium, gadoliniurn, and ytterbium ; hydrides was examined from 4 deg K to room temperature. The hydrogen-metal ; alloys were prepared by conventional techniques in conventional vacuum systems. ;

Zanowick

1961-01-01

162

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

PubMed

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

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

2012-10-01

163

Ytterbium(III) TriflateCatalyzed Stereoselective Synthesis of ??Lactams via [2+2] Cyclocondensation in Ionic Liquid  

Microsoft Academic Search

Catalyzed by ytterbium(III) triflate [Yb(OTf)3], ??lactams were stereoselectively synthesized from imines and acetyl chlorides in ionic liquid under mild conditions. The ionic liquid and catalyst could be recycled and reused as opposed to traditional solventcatalyst systems.

Rener Chen; Bingjian Yang; Weike Su

2006-01-01

164

Corneal topographic analysis of photorefractive keratectomy in 175 myopic eyes.  

PubMed

Videokeratography is a useful method for postoperative evaluation of photorefractive keratectomy (PRK). The aim of this study was to evaluate the percentage of decentration, the relationship between decentration relative to the corneal apex, postoperative astigmatism, and the relationship between decentration and best corrected Snellen visual acuity. Using the TMS-1 videokeratoscope we analyzed the corneal topography of 175 myopic eyes treated with PRKs ranging between -1.30 D and -15.90 D, performed using the Summit UV200 193-nanometer excimer laser, before and at least 6 months after the procedure. Concerning centration, 122 eyes (75%) were centered within 0.5 mm and 53 eyes (30.3%) were decentered more than 0.5 mm, with nine eyes (5.1%) being decentered more than 1 mm. There was a correlation between best spectacle corrected visual acuity and the amount of decentration. The higher attempted corrections showed greater amounts of decentration. Postoperative induced astigmatism was greater in the group with the highest decentration (1.81 +/- 2.64 D) than in the one with lower decentration (0.09 +/- 0.50 D). The most severe complication induced by a decentered PRK is an increase of postoperative astigmatism. PMID:8499370

Cantera, E; Cantera, I; Olivieri, L

165

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

Code of Federal Regulations, 2013 CFR

...175 Public Contracts and Property Management Federal Property Management Regulations System...MANAGEMENT REGULATION REAL PROPERTY 74-FACILITY MANAGEMENT Facility Management Energy Conservation § 102-74.175...

2013-01-01

166

A novel cryptic plasmid pBMB175 from Bacillus thuringiensis subsp. tenebrionis YBT-1765.  

PubMed

A new cryptic plasmid pBMB175 from Bacillus thuringiensis subsp. tenebrionis YBT-1765 was isolated and characterized. Sequence analysis showed that pBMB175 (14,841 bp and 31% GC content) contained at least eighteen putative open reading frames (ORFs), among which nine ORFs displayed the homology with the hypothetical proteins in rolling-circle replication plasmid pGI3. Deletion analysis revealed that the pBMB175 minireplicon located in a novel 1,151 bp fragment. This fragment contains ORF7 coding sequence, which encodes a protein (Rep175, 149 amino acids [aa]) indispensable for plasmid replication. Rep175 has no significant homology with known function proteins. Furthermore, a putative double-strand origin (dso), having no DNA similarity with characterized dso of other replicon so far, was identified in this minireplicon fragment. These features showed that pBMB175 could be placed into a new plasmid family. PMID:17310366

Huang, Junyan; Han, Dongmei; Yu, Ziniu; Sun, Ming

2007-02-20

167

Pulsed current activated combustion synthesis and consolidation of nanostructured ReSi 1.75  

Microsoft Academic Search

Dense nanostructured ReSi1.75 was synthesized by the pulsed current activated combustion synthesis (PCACS) method within 2 min in one step from mechanically\\u000a activated powders of Re and 1.75 Si. Simultaneous combustion synthesis and densification were accomplished under the combined\\u000a effects of a pulsed current and mechanical pressure. Highly dense ReSi1.75 was produced under simultaneous application of 80 MPa of pressure

In-Jin Shon; Su-Chul Kim; Byung-Soo Lee; Byung-Ryang Kim

2009-01-01

168

Towards optical pumping of ytterbium nuclei embedded in a solid neon matrix  

NASA Astrophysics Data System (ADS)

We have studied the optical excitation and decay dynamics of neutral ytterbium atoms embedded in a cryogenic solid neon matrix. Matrix isolated atoms qualitatively retain the energy level structure of atoms in the gas phase. The transitions are typically blue shifted and significantly broadened to a few hundred cm-1, independent of temperature from 2.6 K to 4.2 K. The transition width is found to be homogeneous but not lifetime broadened. We will report our results on spectroscopy, lifetimes, and our attempt to polarize nuclear spins by optical pumping. Applications of such a technique include studies of rare isotopes and tests of fundamental symmetries. This work is supported by DOE, Office of Nuclear Physics, under contract DEAC02-06CH11357.

Xu, Chen-Yu; Singh, Jaideep; Bailey, Kevin; Lu, Zheng-Tian; Mueller, Peter; O'Connor, Thomas

2012-06-01

169

8-Quinolinolate complexes of yttrium and ytterbium: molecular arrangement and fragmentation under laser impact.  

PubMed

New 8-quinolinolate (Q) complexes of yttrium () and ytterbium () were synthesized by the reactions of Cp3Y and Yb[N(SiMe3)2]3 with 3 equiv. of 8-hydroxyquinoline in a DME solution. Single crystal X-ray analysis revealed the trinuclear molecular structure of the compounds Ln3Q9. The LDI-TOFMS investigation displayed that under the laser impact the compounds split off Q(-) anions to give Ln3Q8(+), Ln2Q5(+) and LnQ3(+) moieties. In the negative mode spectra the anions Q(-) and LnQ4(-) were observed. The DFT calculations showed the decreased stability of cationic Ln-quinolinolate as compared with their anionic counterparts. Complex which is used as an emitter in a three-layer OLED displayed a metal-centered emission at 979 nm and an intensity of 50 ?W cm(-2) at 15.5 V. PMID:24048370

Baranov, Evgeny V; Fukin, Georgy K; Balashova, Tatyana V; Pushkarev, Anatoly P; Grishin, Ivan D; Bochkarev, Mikhail N

2013-10-22

170

Simultaneous magneto-optical trapping of lithium and ytterbium atoms towards production of ultracold polar molecules  

NASA Astrophysics Data System (ADS)

We have successfully implemented the first simultaneous magneto-optical trapping (MOT) of lithium (6Li) and ytterbium (174Yb) atoms towards production of ultracold polar molecules of LiYb. For this purpose, we developed the dual atomic oven which contains both atomic species as an atom source and successfully observed the spectra of the Li and Yb atoms in the atomic beams from the dual atomic oven. We constructed the vacuum chamber including the glass cell with the windows made of zinc selenium (ZnSe) for the CO2 lasers, which are the useful light sources of optical trapping for evaporative and sympathetic cooling. Typical atom numbers and temperatures in the compressed MOT are 7103 atoms, 640 ?K for 6Li, 7104 atoms, and 60 ?K for 174Yb, respectively.

Okano, M.; Hara, H.; Muramatsu, M.; Doi, K.; Uetake, S.; Takasu, Y.; Takahashi, Y.

2010-03-01

171

High-power Kerr-lens mode-locked ytterbium lasers  

NASA Astrophysics Data System (ADS)

Progress in the development of efficient and reliable diode-pumped ytterbium femtosecond laser systems based on Kerr-lens mode locking effect is reported. Average output power of up to 1 W is demonstrated in a Kerr-lens mode locked Yb:YVO4 laser with pulse durations as short as 80 fs at a pulse repetition frequency of 79 MHz. Measurements of the nonlinear refractive indexes of the Yb3+:YVO4 crystal, n2, were performed and were determined to be 3910-16 cm2/W and 4910-16 cm2/W for E||c and E?c polarizations, respectively. These results were found to be in a good agreement with those calculated using both the Kramers-Krnig relation and Boling, Glass and Owyoung formula. Keywords: Mode-locked lasers, diode-pumped lasers 1.

Bain, F. M.; Lagatsky, A. A.; Brown, C. T. A.; Sibbett, W.

2008-03-01

172

Gamma-radiation-induced photodarkening in ytterbium-doped silica glasses  

NASA Astrophysics Data System (ADS)

Photodarkening phenomenon in ytterbium (Yb)-doped silica glasses was experimentally investigated by measurements such as electron spin resonance (ESR), X-ray absorption fine-structure (XAFS), and optical transmittance. A predominant increase of Al-oxygen hole center (OHC) was observed for Al-Yb co-doped silica glasses both by the incidence of pump light and by gamma-ray irradiation. It was also recognized that the optical transmission loss similarly increased in both cases. These results indicate that the formation of Al-OHC is the prime cause of the excess loss induced by photodarkening. XAFS measurement indicated that the second-nearest-neighbor atoms around Yb may be related to the mechanism of photodarkening phenomenon.

Arai, T.; Ichii, K.; Tanigawa, S.; Fujimaki, M.

2011-02-01

173

Photoemission and Photoabsorption Investigation of the Electronic Structure of Ytterbium-Doped Strontium Fluoroapatite  

NASA Astrophysics Data System (ADS)

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 were used to evaluate the density of occupied states of this fluoroapatite. Element-specific density of unoccupied electronic states in Yb:S-FAP was 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.

Nelson, A. J.; van Buuren, T.; Bostedt, C.; Schaffers, K. I.; Terminello, Lou

174

Electronic structure of ytterbium-doped strontium fluoroapatite: Photoemission and photoabsorption investigation  

NASA Astrophysics Data System (ADS)

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 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 measurements of the electronic structure and surface chemistry of this material.

Nelson, A. J.; van Buuren, T.; Bostedt, C.; Schaffers, K. I.; Terminello, L. J.; Engelhard, Mark; Baer, Don

2002-04-01

175

Diode-pumped 1028 nm Ytterbium-doped fiber laser with near 90% slope efficiency  

NASA Astrophysics Data System (ADS)

Highly efficient laser action from an Ytterbium-doped fiber (YDF) is demonstrated using a fiber Bragg grating (FBG) in conjunction with a 4% Fresnel reflection at room temperature. The YDF used 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 core composition of 0.2 wt % of Yb2O3, 1.8 wt % of Al2O3 and 23 wt % of GeO2 with a pump absorption of 9.0 dB/m. The fiber laser operates at wavelength of 1028 nm with a slope efficiency of 88% with respect to the launched 976 nm pump power using the YDF length of 7 m.

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

2010-03-01

176

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

NASA Astrophysics Data System (ADS)

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.

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

2009-08-01

177

Single-Mode ytterbium-doped Large-Mode-Area photonic bandgap rod fiber amplifier.  

PubMed

Enabling Single-Mode (SM) operation in Large-Mode-Area (LMA) fiber amplifiers and lasers is critical, since a SM output ensures high beam quality and excellent pointing stability. In this paper, we demonstrate and test a new design approach for achieving SM LMA rod fibers by using a photonic bandgap structure. The structure allows resonant coupling of higher-order modes from the core and acts as a spatially Distributed Mode Filter (DMF). With this approach, we demonstrate passive SM performance in an only ~50 cm long and straight ytterbium-doped rod fiber. The amplifier has a mode field diameter of ~59 m at 1064 nm and exhibits a pump absorption of 27 dB/m at 976 nm. PMID:21503050

Alkeskjold, Thomas Tanggaard; Laurila, Marko; Scolari, Lara; Broeng, Jes

2011-04-11

178

49 CFR 175.10 - Exceptions for passengers, crewmembers, and air operators.  

Code of Federal Regulations, 2010 CFR

...passengers, crewmembers, and air operators. 175...crewmembers, and air operators. ...radioactive) material or lithium batteries; and radiopharmaceuticals...containing cells or batteries (including lithium cells or...

2010-10-01

179

49 CFR 175.10 - Exceptions for passengers, crewmembers, and air operators.  

Code of Federal Regulations, 2010 CFR

...passengers, crewmembers, and air operators. 175...crewmembers, and air operators. ...radioactive) material or lithium batteries; and radiopharmaceuticals...containing cells or batteries (including lithium cells or...

2009-10-01

180

Single-frequency ytterbium-doped fiber laser at 976 nm  

NASA Astrophysics Data System (ADS)

Linearly polarized wavelength stable single frequency ytterbium (Yb3+) doped fiber lasers below 1 ?m, namely threelevel Yb3+ fiber lasers, are highly demanded for nonlinear wavelength conversion to generate coherent blue light or even deep ultraviolet coherent sources. We present performance of a 976 nm single-frequency core-pumped distributed Bragg reflector (DBR) fiber laser consisting of a 2-cm long highly ytterbium-doped phosphate fiber and a pair of silica fiber Bragg gratings (FBGs) and their use for frequency doubling experiment. The high reflection (HR > 99%) and partial reflection (PR = 60%) FBGs were cleaved very close to the index modulation region and directly spliced to a 2-cm-long highly Yb3+-doped phosphate fiber. Over 100 mW of linearly polarized output with a linewidth less than 2 kHz can be obtained when the launched pump power is about 450 mW. The efficiency of the 976 nm single-frequency fiber laser (the output power vs the launched pump power) is about 25%. The relative intensity noise was measured to be -110 dB/Hz at 1 MHz and the variation of the center wavelength is less than 0.0005 nm during a measurement period of 2.5 hours. This single-frequency fiber laser has an SNR of over 50 dB and there is no strong ASE or spurious lasing at long wavelengths even at the maximum pump power. This all-fiber single-frequency DBR laser with attractive features can be used for efficient blue and UV generation through nonlinear frequency conversion. Moreover, this high-performance 976 nm single-frequency fiber laser can be used as a single-frequency, low RIN pump laser for long wavelength Yb3+-, Er3+-, or Yb3+/Er3+-doped fiber lasers and amplifiers.

Zhu, X.; Shi, W.; Zong, J.; Nguyen, D.; Norwood, R. A.; Chavez-Pirson, A.; Peyghambarian, N.

2013-02-01

181

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

NASA Astrophysics Data System (ADS)

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 1S0 --> 1P1 transition captures ytterbium directly from a dispenser of atoms and loads a 3D-MOT on the narrow 1S0 --> 3P1 intercombination transition. Subsequently, atoms are transferred to a crossed optical dipole trap and cooled evaporatively to quantum degeneracy.

Drscher, Sren; Thobe, Alexander; Hundt, Bastian; Kochanke, Andr; Le Targat, Rodolphe; Windpassinger, Patrick; Becker, Christoph; Sengstock, Klaus

2013-04-01

182

Passively synchronized erbium (1550-nm) and ytterbium (1040-nm) mode-locked fiber lasers sharing a cavity.  

PubMed

Erbium and ytterbium fiber lasers were firmly synchronized by nonlinear interaction in active media placed in the same cavity. A two-color femtosecond-picosecond pulse train at largely separate wavelengths of 1.55 and 1.04 microm was generated. Optimizing the laser cavity to enhance the cross-phase modulation in the gain materials has yielded a large mismatch of 20 microm between the two laser cavities. PMID:15524369

Rusu, Matei; Herda, Robert; Okhotnikov, Oleg G

2004-10-01

183

Realization of quantum non-demolition measurement of nuclear spin 1\\/2 of cold ytterbium atom  

Microsoft Academic Search

We have demonstrated a quantum non-demolition (QND) measurement with a collective spin of cold ytterbium atoms (171Yb) via Faraday rotation interaction, and have observed 1.8-1.5+2.4 dB spin squeezing. Since 171Yb atoms have only a nuclear spin of one-half in the ground state, the system constitutes the simplest spin ensemble and is thus robust against decoherence. Furthermore, we have considered the

T. Takano; R. Namiki; Y. Takahashi

2009-01-01

184

Dosimetric characteristics, air-kerma strength calibration and verification of Monte Carlo simulation for a new ytterbium-169 brachytherapy source  

Microsoft Academic Search

Ytterbium-169 ([sup 169]Yb) is a promising new isotope for brachytherapy with a half life of 32 days and an average photon energy of 93 KeV. It has an Ir-192-equivalent dose distribution in water but a much smaller half-value layer in lead (0.2 mm), affording improved radiation protection and customized shielding of dose-limiting anatomic structures. The goals of this study are

Harold Perera; Jeffrey F Williamson; Zuofeng Li; Vivek Mishra; Ali S Meigooni

1994-01-01

185

High-energy femtosecond pulses from an ytterbium-doped fiber laser with a new cavity design  

Microsoft Academic Search

A new architecture which is based on the chirped pulse amplification scheme is proposed to increase the pulse energy of the mode-locked fiber laser. The idea was applied to a passively mode-locked laser using an ytterbium (Yb3+)-doped double-clad silica fiber. Mode-locking was achieved by nonlinear polarization evolution associated to frequency-shifted feedback technique for self-starting. A compressor and a stretcher, based

A. Albert; V. Couderc; L. Lefort; A. Barthelemy

2004-01-01

186

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

Code of Federal Regulations, 2011 CFR

... 2011-10-01 false High-speed rail cars, monorails and systems. 38.175...and Systems § 38.175 High-speed rail cars, monorails and systems. (a) All cars for high-speed rail systems, including but not limited to...

2011-10-01

187

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

Code of Federal Regulations, 2012 CFR

... 2012-10-01 false High-speed rail cars, monorails and systems. 38.175...and Systems § 38.175 High-speed rail cars, monorails and systems. (a) All cars for high-speed rail systems, including but not limited to...

2012-10-01

188

21 CFR 175.230 - Hot-melt strippable food coatings.  

Code of Federal Regulations, 2010 CFR

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

2010-01-01

189

21 CFR 175.230 - Hot-melt strippable food coatings.  

Code of Federal Regulations, 2010 CFR

...2009-04-01 2009-04-01 false Hot-melt strippable food coatings. 175.230 Section...as Components of Coatings § 175.230 Hot-melt strippable food coatings. Hot-melt strippable food coatings may be safely...

2009-04-01

190

Effects of nicotine administration in a mouse model of familial hypertrophic cardiomyopathy, ?-tropomyosin D175N  

PubMed Central

The effects of nicotine (NIC) on normal hearts are fairly well established, yet its effects on hearts displaying familial hypertrophic cardiomyopathy have not been tested. We studied both the acute and chronic effects of NIC on a transgenic (TG) mouse model of FHC caused by a mutation in ?-tropomyosin (Tm; i.e., ?-Tm D175N TG, or Tm175). For acute effects, intravenously injected NIC increased heart rate, left ventricular (LV) pressure, and the maximal rate of LV pressure increase (+dP/dt) in non-TG (NTG) and Tm175 mice; however, Tm175 showed a significantly smaller increase in the maximal rate of LV pressure decrease (?dP/dt) compared with NTGs. Western blots revealed phosphorylation of phospholamban Ser16 and Thr17 residue increased in NTG mice following NIC injection but not in Tm175 mice. In contrast, phosphorylation of troponin I at serine residues 23 and 24 increased equally in both NTG and Tm175. Thus the attenuated increase in relaxation in Tm175 mice following acute NIC appears to result primarily from attenuated phospholamban phosphorylation. Chronic NIC administration (equivalent to smoking 2 packs of cigarettes/day for 4 mo) also increased +dP/dt in NTG and Tm175 mice compared with chronic saline. However, chronic NIC had little effect on heart rate, LV pressure, ?dP/dt, LV wall and chamber dimensions, or collagen content for either group of mice.

Gaffin, Robert D.; Chowdhury, Shamim A. K.; Alves, Marco S. L.; Dias, Fernando A. L.; Ribeiro, Cibele T. D.; Fogaca, Rosalvo T. H.; Wieczorek, David F.

2011-01-01

191

21 CFR 175.390 - Zinc-silicon dioxide matrix coatings.  

Code of Federal Regulations, 2013 CFR

...3 2013-04-01 2013-04-01 false Zinc-silicon dioxide matrix coatings. 175.390...Use as Components of Coatings § 175.390 Zinc-silicon dioxide matrix coatings. Zinc-silicon dioxide matrix coatings may...

2013-04-01

192

21 CFR 175.390 - Zinc-silicon dioxide matrix coatings.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2009-04-01 true Zinc-silicon dioxide matrix coatings. 175.390 Section...Components of Coatings § 175.390 Zinc-silicon dioxide matrix coatings. Zinc-silicon dioxide matrix coatings may be...

2010-01-01

193

21 CFR 175.390 - Zinc-silicon dioxide matrix coatings.  

Code of Federal Regulations, 2010 CFR

...2009-04-01 2009-04-01 false Zinc-silicon dioxide matrix coatings. 175.390 Section...Components of Coatings § 175.390 Zinc-silicon dioxide matrix coatings. Zinc-silicon dioxide matrix coatings may be...

2009-04-01

194

46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.  

Code of Federal Regulations, 2011 CFR

...Shipping 1 2011-10-01 2011-10-01 false Alaska Peninsula, AK to Nunivak, AK. 7.175 Section...PROCEDURES APPLICABLE TO THE PUBLIC BOUNDARY LINES Alaska § 7.175 Alaska Peninsula, AK to Nunivak, AK. (a) A...

2011-10-01

195

46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.  

Code of Federal Regulations, 2012 CFR

...Shipping 1 2012-10-01 2012-10-01 false Alaska Peninsula, AK to Nunivak, AK. 7.175 Section...PROCEDURES APPLICABLE TO THE PUBLIC BOUNDARY LINES Alaska § 7.175 Alaska Peninsula, AK to Nunivak, AK. (a) A...

2012-10-01

196

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

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Soil and water conservation expenditures; in...Corporations (continued) § 1.175-1 Soil and water conservation expenditures; in...Under section 175, a farmer may deduct his soil or water conservation...

2013-04-01

197

Influence of ytterbium concentration on the emissive properties of Yb:YAG and Yb:Y2O3  

NASA Astrophysics Data System (ADS)

The Paul Scherrer Institut has initiated a project to develop a thermophotovoltaic (TPV) converter for residential heating applications. By economic reasons we have decided to design a thermophotovoltaic generator based on Si-cells and, accordingly, to make use of the selective emission properties of ytterbium containing emitter materials. In this contribution, we focus on the emitter materials and present results of an experimental study on the influence of ytterbium concentration on the emissive properties of ytterbium doped yttrium aluminum garnet (YAG) and yttria. The emitter materials were prepared by decomposition of nitrates and by co-precipitation methods with subsequent calcination at elevated temperatures. The polycrystalline materials are characterized by X-Ray diffraction (XRD), particle size distribution (PSD) measurements and Raman and fluorescence microscopy. The emissive properties of the Yb-doped materials have been measured at about 1400 K. Additionally, current-voltage (I-V) curves of the Si-cells used in a prototype TPV generator have been recorded for selected emitter materials.

Panitz, J.-C.; Schubnell, M.; Durisch, W.; Geiger, F.

1997-03-01

198

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

NASA Astrophysics Data System (ADS)

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.

Bayramian, Andrew James

2000-11-01

199

Determination of laser parameters of ytterbium-doped oxide crystalline materials  

NASA Astrophysics Data System (ADS)

Spectroscopic and laser properties at approx1 mum of seven new ytterbium-doped crystalline materials--silicates Y2SiO5, Ca2Al2SiO7, SrY4(SiO4)3O, borates Ca3Y2(BO3)4, Ca3Gd2(BO3)4, Sr3Y(BO3)3, and Ba3Lu(BO3)3-- are investigated. Absorption and emission cross sections are strongly dependent on the crystalline host. Good agreement is obtained between emission cross sections calculated by the reciprocity method and by the Fuchtbauer-Ladenburg method. The wavelength dependence of the gain cross sections are also determined. Except for Ba3Lu(BO3)3, which is of poor crystalline quality, laser oscillations in a plano-concave cavity are obtained for all the presented hosts. From optical spectroscopy and laser results, large tunability of the emission is expected for these materials. Slope efficiencies are in the range 40%-60% with very low threshold values.

Haumesser, Paul-Henri; Gaume, Romain; Viana, Bruno; Vivien, Daniel

2002-10-01

200

Analysis of temperature dependence of photodarkening in ytterbium-doped fibers  

NASA Astrophysics Data System (ADS)

We examine the temperature dependence of photodarkening in ytterbium-doped silica fibers. A sequence of consecutive photodarkening experiments are performed over the same fiber sample, which shows good repeatability with no apparent changes in the glass structure. We find that during infrared irradiation, the level of saturation of the losses can be determined by the fiber core temperature, independent of the previous state of photodarkening losses and fiber temperature, and also at low temperatures where the thermal bleaching is not activated. We observe that variations in the fiber core temperature, induced by pump absorption due to photodarkening, affect the inversion level and photodarkening processes. These effects in turn cause a discrepancy in determining the ion dependence. We highlight the importance of performing the experiments under isothermal conditions and we propose a new approach to control the fiber temperature at room temperature and at elevated temperatures. The approach is based on an isothermal Galinstan bath. The appropriateness of this method is shown by comparing it to different cooling methods, and the results are supported by simulations.

Montiel I Ponsoda, Joan J.; Ye, Changgeng; Koplow, Jeffrey P.; Sderlund, Mikko J.; Koponen, Joona J.; Honkanen, Seppo

2011-11-01

201

Reflectivity and thermally modulated reflectivity of yttrium, gadolinium, erbium and ytterbium iron garnets  

NASA Astrophysics Data System (ADS)

Optical reflectivity and thermoreflectivity measurements in the 2.5-4.7 eV region for gadolinium iron garnet, erbium iron garnet and ytterbium iron garnet are reported and discussed in relation to previous measurements performed on yttrium iron garnet. Near normal incidence reflectivity spectra of YbIG, ErIG, GdIG and YIG single crystals measured at room temperature and YIG measured at 80 K are shown to consist of two peaks centered around 3.3 and 4.4 eV and a number of structural features, demonstrating that the absolute reflectivity is not appreciably altered by the substitution of yttrium with heavier rare earth ions. Thermoreflectivity spectra of the same compounds taken at a temperature of 300 K are shown to contain the same number of positive and negative derivative peaks, which are strongly correlated with the reflectivity structures, and a gradual shift of the baseline with respect to YIG with increasing atomic weight. The experimental data for YbIG and YIG are analyzed in terms of a model describing the dielectric response of a system of localized excitations associated with a classical damped Lorentz operator. On the basis of the similarity of the rare earth spectra, assignments of YIG transitions are concluded to apply to the rare earth iron garnets, with the shift of the baseline with increasing atomic number attributed to the tailing of high-energy oscillators.

Balzarotti, A.; Picozzi, P.; Ricchiuto, A.; Santucci, S.

1980-12-01

202

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

SciTech Connect

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.

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

2011-02-11

203

Dose distributions and dose rate constants for new ytterbium-169 brachytherapy seeds.  

PubMed

Relative dose distributions in the vicinities of two new prototypes of ytterbium-169 brachytherapy sources have been measured using lithium fluoride thermoluminescent dosimeters (TLD) placed in a solid water phantom. The type 6 seed consists of four Yb2O3 spheres contained in a 0.075-mm thick titanium tube, with overall dimensions of 4.5 mm in length and 0.8 mm in diameter. The type 8 seed contains a cylindrical segment of Yb wire, 2.5 mm long, sealed in a 0.075-mm thick titanium tube 4 mm in length and 0.5 mm in diameter. The relative dose distributions, measured with TLD, were compared with those predicted by Monte Carlo simulations (MCNP code). Experimental and theoretical dose distributions were generally in agreement within 5% of the local dose value. Source strength was determined from activity measurements using a high purity germanium (HPGe) spectrometer. With source strengths established, thermoluminescence was then used to measure the dose rate constant, lambda 0, for the type 8 seed. The measured lambda 0 of 1.34 +/- 0.10 cGy U-1 for the type 8 seed agrees, within statistical uncertainty, with the value of 1.25 +/- 0.05 cGy U-1 predicted through Monte Carlo simulation. Comparisons are made with experimental data reported by other investigators. PMID:7715573

MacPherson, M S; Battista, J J

1995-01-01

204

PENTAMETHYLCYCLOPENTADIENYL DERIVATIVES OF THE TRIVALENT LANTHANIDE ELEMENTS (NEODYMIUM, SAMARIUM, AND YTTERBIUM)  

SciTech Connect

The anionic complexes of the type (ML{sub x})(Me{sub 5}C{sub 5}){sub 2}M'Cl{sub 2}, where M is lithium or sodium, L is diethyl ether or N,N,-N{prime},N{prime}-tetramethylethylenediamine, and M{prime} is neodymium, samarium, or ytterbium, have been prepared from the metal trichlorides and the pentamethylcyclopentadienide anion. The neutral species (Me{sub 5}C{sub 5}){sub 2}NdCl(THF), (Me{sub 5}C{sub 5}){sub 2}NdN(SiMe{sub 3}){sub 2}, and (Me{sub 5}C{sub 5}){sub 2}YbCl(THF) have also been prepared. The mono-ring derivatives (Na(OEt{sub 2}){sub 2})((C{sub 5}Me{sub 5})NdCl{sub 3}) and (Me{sub 5}C{sub 5})Nd(N(SiMe{sub 3}){sub 2}){sub 2} are also described.

Tilley, T. Don; Andersen, R.A.

1980-07-01

205

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

Code of Federal Regulations, 2011 CFR

... false Transportation of flammable liquid fuel; aircraft only means of transportation...175.310 Transportation of flammable liquid fuel; aircraft only means of transportation...transportation are impracticable, flammable liquid fuels may be carried on...

2011-10-01

206

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

Code of Federal Regulations, 2012 CFR

... false Transportation of flammable liquid fuel; aircraft only means of transportation...175.310 Transportation of flammable liquid fuel; aircraft only means of transportation...transportation are impracticable, flammable liquid fuels may be carried on...

2012-10-01

207

The National Library of Medicine: 175 Years of Innovation | NIH MedlinePlus the Magazine  

MedlinePLUS

... this page please turn Javascript on. The National Library of Medicine 175 Years of Information Innovation Past ... than 40 years! Today, thanks to the National Library of Medicine, virtually any bit of information ever ...

208

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

Code of Federal Regulations, 2010 CFR

...2009-04-01 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...

2009-04-01

209

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

Code of Federal Regulations, 2010 CFR

...2010-04-01 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...

2010-04-01

210

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

Code of Federal Regulations, 2011 CFR

...ENVIRONMENTAL PROTECTION AGENCY (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...

2011-07-01

211

40 CFR 267.175 - What special requirements must I meet for incompatible wastes?  

Code of Federal Regulations, 2013 CFR

...AGENCY (CONTINUED) SOLID WASTES (CONTINUED) STANDARDS...OWNERS AND OPERATORS OF HAZARDOUS WASTE FACILITIES OPERATING UNDER A STANDARDIZED PERMIT Use and Management of Containers § 267.175...must I meet for incompatible wastes? (a) You must not...

2013-07-01

212

25 CFR 170.175 - What Indian LTAP-sponsored transportation training and educational opportunities exist?  

Code of Federal Regulations, 2011 CFR

...Indian LTAP-sponsored transportation training and educational opportunities exist...Indian Ltap-Sponsored Education and Training Opportunities § 170.175 What Indian LTAP-sponsored transportation training and educational opportunities...

2011-04-01

213

40 CFR 417.175 - Standards of performance for new sources.  

Code of Federal Regulations, 2012 CFR

...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...

2012-07-01

214

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

Code of Federal Regulations, 2013 CFR

... EFFLUENT GUIDELINES AND STANDARDS (CONTINUED) 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...

2013-07-01

215

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

Code of Federal Regulations, 2010 CFR

...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....

2009-10-01

216

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

Code of Federal Regulations, 2010 CFR

...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....

2010-10-01

217

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...continued) § 1.175-2 Definition of soil and water conservation expenditures...expenditures paid or incurred for the purpose of soil or water conservation in...

2013-04-01

218

27 CFR 17.5 - Products manufactured in Puerto Rico or the Virgin Islands.  

Code of Federal Regulations, 2013 CFR

...false Products manufactured in Puerto Rico or the Virgin Islands. 17...5 Products manufactured in Puerto Rico or the Virgin Islands. ...brought into the United States from Puerto Rico or the U.S. Virgin...

2013-04-01

219

40 CFR 270.175 - For what reasons may the Director choose to modify my final RAP?  

Code of Federal Regulations, 2010 CFR

...what reasons may the Director choose to modify my final RAP? 270.175 Section 270.175 Protection of Environment...HAZARDOUS WASTE PERMIT PROGRAM Remedial Action Plans (RAPs) How May My Rap Be Modified, Revoked and Reissued, Or...

2010-07-01

220

40 CFR 270.175 - For what reasons may the Director choose to modify my final RAP?  

Code of Federal Regulations, 2010 CFR

...what reasons may the Director choose to modify my final RAP? 270.175 Section 270.175 Protection of Environment...HAZARDOUS WASTE PERMIT PROGRAM Remedial Action Plans (RAPs) How May My Rap Be Modified, Revoked and Reissued, Or...

2009-07-01

221

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 ...

222

Polarization-maintaining amplification of phase modulated pulse employing ytterbium-doped single-mode fiber amplifier  

NASA Astrophysics Data System (ADS)

Polarization-maintaining fiber amplifier using ytterbium-doped single-mode fiber (SMF) is proposed. A 45 Faraday rotator mirror (FRM) and a polarization independent fiber loop circulator (FLC) with polarization-maintaining fiber (PMF) pigtails are used to realize double-pass amplification and birefringence self-compensation. Arbitrary state of polarization (SOP) such as the linear polarization and elliptical polarization can be maintained. Polarization-maintaining amplification of phase modulated pulse with this amplifier is experimentally demonstrated while introducing little intensity modulation itself.

Wang, J. J.; Huang, Z. H.; Xu, D. P.; Deng, Y.; Lin, H. H.; Zhang, R.

2012-02-01

223

Realization of quantum non-demolition measurement of nuclear spin 1/2 of cold ytterbium atom  

NASA Astrophysics Data System (ADS)

We have demonstrated a quantum non-demolition (QND) measurement with a collective spin of cold ytterbium atoms (171Yb) via Faraday rotation interaction, and have observed 1.8-1.5+2.4 dB spin squeezing. Since 171Yb atoms have only a nuclear spin of one-half in the ground state, the system constitutes the simplest spin ensemble and is thus robust against decoherence. Furthermore, we have considered the atomic quantum swapping gate as a quantum information device using multiple Faraday rotation interactions, and have found that we can realize the quantum-domain performance for a realistic experimental condition.

Takano, T.; Namiki, R.; Takahashi, Y.

2009-04-01

224

Characterization of a Plasmodium falciparum erythrocyte-binding protein paralogous to EBA-175  

PubMed Central

A member of a Plasmodium receptor family for erythrocyte invasion was identified on chromosome 13 from the Plasmodium falciparum genome sequence of the Sanger Centre (Cambridge, U.K.). The protein (named BAEBL) has homology to EBA-175, a P. falciparum receptor that binds specifically to sialic acid and the peptide backbone of glycophorin A on erythrocytes. Both EBA-175 and BAEBL localize to the micronemes, organelles at the invasive ends of the parasites that contain other members of the family. Like EBA-175, the erythrocyte receptor for BAEBL is destroyed by neuraminidase and trypsin, indicating that the erythrocyte receptor is a sialoglycoprotein. Its specificity, however, differs from that of EBA-175 in that BAEBL can bind to erythrocytes that lack glycophorin A, the receptor for EBA-175. It has reduced binding to erythrocytes with the Gerbich mutation found in another erythrocyte, sialoglycoprotein (glycophorin C/D). The interest in BAEBL's reduced binding to Gerbich erythrocytes derives from the high frequency of the Gerbich phenotype in some regions of Papua New Guinea where P. falciparum is hyperendemic.

Mayer, D. C. Ghislaine; Kaneko, Osamu; Hudson-Taylor, Diana E.; Reid, Marion E.; Miller, Louis H.

2001-01-01

225

Influence of ground-state scattering properties on photoassociation spectra near the intercombination line of bosonic ytterbium  

SciTech Connect

We study theoretically the properties of photoassociation spectra near the {sup 1}S{sub 0}-{sup 3}P{sub 1} inter-combination line of bosonic ytterbium. We construct a mass scaled model of the excited state interaction potential that well describes bound state energies obtained in a previous photoassociation experiment. We then use it to calculate theoretical photoassociation spectra in a range of ultracold temperatures using semianalytical theory developed by Bohn and Julienne.Photoassociation spectra not only give us the energies of excited bound states, but also provide information about the behavior of the ground state wavefunction. In fact, it can be shown that within the so-called reflection approximation the line intensity is proportional to the ground state wavefunction at the transition's Condon point. We show that in the case of ytterbium, the rotational structure of the photoassociation spectra depends heavily on the behavior of the ground-state wavefunction. The change of the scattering length from one isotope to another and the resulting occurence of shape resonances in higher partial waves determines the appearance and disapperance of rotational components, especially in the deeper lying states, whose respective Condon points lie near the ground state centrifugal barrier. Thus, photoassociation spectra differ qualitatively between isotopes.

Borkowski, M.; Ciurylo, R. [Instytut Fizyki, Uniwersytet Mikolaja Kopernika, ul. Grudziadzka 5/7, 87-100 Torun (Poland); Julienne, P. S. [Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, 100 Bureau Drive, Stop 8423, Gaithersburg, Maryland 20899-8423 (United States); Tojo, S. [Department of Physics, Faculty of Science, Gakushuin University, Tokyo 171-8588 (Japan); Enomoto, K. [Department of Physics, University of Toyama, 3190 Gofuku, Toyama 930-8555 (Japan); Takahashi, Y. [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan)

2010-10-29

226

Activation cross-sections of longer lived products of deuteron induced nuclear reactions on ytterbium up to 40 MeV  

NASA Astrophysics Data System (ADS)

Experimental excitation function of deuteron induced reactions on natural ytterbium up to 40 MeV.Model code calculations with EMPIRE-D, ALICE-D and TALYS (TENDL-2011 and 2012).Physical yield calculation.Tabulated experimental results.Discussion of medical and industrial applications.

Trknyi, F.; Ditri, F.; Takcs, S.; Hermanne, A.; Yamazaki, H.; Baba, M.; Mohammadi, A.; Ignatyuk, A. V.

2013-06-01

227

A potential water-soluble ytterbium-based porphyrin-cyclen dual bio-probe for Golgi apparatus imaging and photodynamic therapy.  

PubMed

An amphiphilic water-soluble ytterbium complex which is photo-selective, functional and Golgi apparatus specific has been designed as a responsive dual probe capable of sensitizing emission within the biological window (660 and 750 nm), generating the singlet oxygen (?(?) = 0.45) and triggering local cell damage only upon exposure to visible and near-infrared laser excitation. PMID:22908122

Zhang, Jing-Xiang; Li, Hongguang; Chan, Chi-Fai; Lan, Rongfeng; Chan, Wai-Lun; Law, Ga-Lai; Wong, Wai-Kwok; Wong, Ka-Leung

2012-10-01

228

High-pressure synthesis, crystal structure, and structural relationship of the first ytterbium fluoride borate Yb5(BO3)2F9  

NASA Astrophysics Data System (ADS)

Yb5(BO3)2F9 was synthesized under high-pressure/high-temperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 1100 C, representing the first known ytterbium fluoride borate. The compound exhibits isolated BO3-groups next to ytterbium cations and fluoride anions, showing a structure closely related to the other known rare-earth fluoride borates RE3(BO3)2F3 (RE=Sm, Eu, Gd) and Gd2(BO3)F3. Monoclinic Yb5(BO3)2F9 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 ?=100.63(3) (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 RE3(BO3)2F3 (RE=Sm, Eu, Gd) and Gd2(BO3)F3, Yb5(BO3)2F9 can be described via alternating layers with the formal compositions YbBO3 and YbF3 in the bc-plane.

Haberer, Almut; Huppertz, Hubert

2009-04-01

229

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

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

K. Rhoads; C. L. Sanders

1985-01-01

230

Short-length high-gain ASE fiber laser at 1.54-?m by high-codoped erbium and ytterbium phosphate laser glasses  

NASA Astrophysics Data System (ADS)

Ytterbium only and erbium-ytterbium co-doped phosphate glass Double Clad (DC) cladding pumped Large Mode Area (LMA) core fibers are manufactured at Kigre by the "rod-in-tube" method. The ytterbium and erbium doping concentration levels in phosphate glass are as much as two orders of magnitude higher than the doping concentrations found in fused silica fiber manufactured by Modified Chemical Vapor Deposition (MCVD) method. The background loss of the fiber"s core and cladding measured ~ 0.01 dB/per cm at 1310nm. The measured absorption coefficient at 974 nm is 0.3 dB/per cm for the ytterbium-erbium co-doped fiber. Greater than 4.6 Watts CW laser output was demonstrated from the Er:Yb:glass fiber at 1535nm with a 37.4% slop efficiency and 36.3% optical efficiency. The Yb:glass fiber produced a maximum output power of 1.6 Watts in a 14cm gain length.

Wu, Ruikun; Myers, John D.; Chen, TaoLue; Myers, Michael J.; Hardy, Christopher R.; Driver, John K.

2004-06-01

231

Vibrational spectra of lutetium and ytterbium bis-phthalocyanine in thin solid films and SER(R)S on silver island films  

NASA Astrophysics Data System (ADS)

Thin solid films of lutetium and ytterbium diphthalocyanine (Pc 2) complexes have been studied using vibrational and electronic absorptions, spontaneous and resonant Raman (RR) and surface enhanced Raman scattering (SERS) on silver island films. Surface enhanced resonance Raman spectra (SERRS) are identical to the RRS spectra with an enhancement factor of about 500. Vibrational data were consistent with a C4 v molecular symmetry.

Aroca, R.; Clavijo, R. E.; Jennings, C. A.; Kovacs, G. J.; Duff, J. M.; Loutfy, R. O.

1989-01-01

232

VIM-2-producing Multidrug-Resistant Pseudomonas aeruginosa ST175 Clone, Spain  

PubMed Central

A total of 183 patients were colonized or infected with multidrug-resistant Pseudomonas aeruginosa isolates at a hospital in Spain during 20072010; prevalence increased over this period from 2.8% to 15.3%. To characterize these isolates, we performed molecular epidemiologic and drug resistance analysis. Genotyping showed that 104 (56.8%) isolates belonged to a single major clone (clone B), which was identified by multilocus sequence typing as sequence type (ST) 175. This clone was initially isolated from 5 patients in 2008, and then isolated from 23 patients in 2009 and 76 patients in 2010. PCR analysis of clone B isolates identified the blaVIM-2 gene in all but 1 isolate, which harbored blaIMP-22. ST175 isolates were susceptible to only amikacin (75%) and colistin (100%). Emergence of the ST175 clone represents a major health problem because it compromises therapy for treatment of P. aeruginosa nosocomial infections.

Viedma, Esther; Juan, Carlos; Villa, Jennifer; Barrado, Laura; Orellana, M. Angeles; Sanz, Francisca; Otero, Joaquin R.; Oliver, Antonio

2012-01-01

233

A MULTI-WAVELENGTH INVESTIGATION OF RCW175: AN H II REGION HARBORING SPINNING DUST EMISSION  

SciTech Connect

Using infrared, radio continuum, and spectral observations, we performed a detailed investigation of the H II region RCW175. We determined that RCW175, which actually consists of two separate H II regions, G29.1-0.7 and G29.0-0.6, is located at a distance of 3.2 {+-} 0.2 kpc. Based on the observations we infer that the more compact G29.0-0.6 is less evolved than G29.1-0.7 and was possibly produced as a result of the expansion of G29.1-0.7 into the surrounding interstellar medium. We compute a star formation rate for RCW175 of (12.6 {+-} 1.9) Multiplication-Sign 10{sup -5} M{sub Sun} yr{sup -1}, and identified six possible young stellar object candidates within its vicinity. Additionally, we estimate that RCW175 contains a total dust mass of 215 {+-} 53 M{sub Sun }. RCW175 has previously been identified as a source of anomalous microwave emission (AME), an excess of emission at centimeter wavelengths often attributed to electric dipole radiation from the smallest dust grains. We find that the AME previously detected in RCW175 is not correlated with the smallest dust grains (polycyclic aromatic hydrocarbons or small carbonaceous dust grains), but rather with the exciting radiation field within the region. This is a similar result to that found in the Perseus molecular cloud, another region which harbors AME, suggesting that the radiation field may play a pivotal role in the production of this new Galactic emission mechanism. Finally, we suggest that these observations may hint at the importance of understanding the role played by the major gas ions in spinning dust models.

Tibbs, C. T.; Compiegne, M.; Carey, S. [Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125 (United States); Paladini, R. [NASA Herschel Science Center, California Institute of Technology, Pasadena, CA 91125 (United States); Dickinson, C.; Davies, R. D.; Davis, R. J. [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester M13 9PL (United Kingdom); Alves, M. I. R. [Institut d'Astrophysique Spatiale, Universite Paris Sud XI, Batiment 121, 91405 Orsay (France); Flagey, N. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91125 (United States); Shenoy, S. [Space Science Division, NASA Ames Research Center, M/S 245-6, Moffett Field, CA 94035 (United States); Noriega-Crespo, A. [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Casassus, S. [Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile); Molinari, S.; Elia, D.; Pestalozzi, M.; Schisano, E., E-mail: ctibbs@ipac.caltech.edu [INAF-Istituto Fisica Spazio Interplanetario, Via Fosso del Cavaliere 100, I-00133 Roma (Italy)

2012-08-01

234

Mutational analysis of the Pseudomonas aeruginosa myovirus KZ morphogenetic protease gp175.  

PubMed

Pseudomonas aeruginosa myovirus KZ has a 270-kb genome within a T=27 icosahedral capsid that contains a large, unusual, and structurally well-defined protein cylindrical inner body (IB) spanning its interior. Proteolysis forms a pivotal stage in KZ head and IB morphogenesis, with the protease gp175 cleaving at least 19 of 49 different head proteins, including the major capsid protein and five major structural IB proteins. Here we show that the purified mature form of gp175 is active and cleaves purified IB structural proteins gp93 and gp89. Expression vector synthesis and purification of the zymogen/precursor yielded an active, mature-length protease, showing independent C-terminal gp175 self-cleavage autoactivation. Mutation of either the predicted catalytic serine or histidine inactivated mature gp175, supporting its classification as a serine protease and representing the first such direct biochemical demonstration with purified protease and substrate proteins for any phage protease. These mutations also blocked self-cleavage of the precursor while allowing intermolecular gp175 processing. To confirm the cleavage specificity of gp175, we mutated three cleavage sites in gp93, which blocked proteolysis at these sites. The N-terminal propeptide of gp93 was shown to undergo more extensive proteolysis than previously identified. We found that proteolysis in gp93 progressed from the N to C terminus, while blocking cleavage sites slowed but did not eliminate downstream proteolysis. These findings were shown by informatics to be relevant to the head morphogenesis of numbers of other related IB-containing giant phages as well as to T4 and herpesviruses, which have homologous proteases. PMID:23740980

Thomas, Julie A; Black, Lindsay W

2013-06-05

235

A Multi-wavelength Investigation of RCW175: An H II Region Harboring Spinning Dust Emission  

NASA Astrophysics Data System (ADS)

Using infrared, radio continuum, and spectral observations, we performed a detailed investigation of the H II region RCW175. We determined that RCW175, which actually consists of two separate H II regions, G29.1-0.7 and G29.0-0.6, is located at a distance of 3.2 0.2 kpc. Based on the observations we infer that the more compact G29.0-0.6 is less evolved than G29.1-0.7 and was possibly produced as a result of the expansion of G29.1-0.7 into the surrounding interstellar medium. We compute a star formation rate for RCW175 of (12.6 1.9) 10-5 M ? yr-1, and identified six possible young stellar object candidates within its vicinity. Additionally, we estimate that RCW175 contains a total dust mass of 215 53 M ?. RCW175 has previously been identified as a source of anomalous microwave emission (AME), an excess of emission at centimeter wavelengths often attributed to electric dipole radiation from the smallest dust grains. We find that the AME previously detected in RCW175 is not correlated with the smallest dust grains (polycyclic aromatic hydrocarbons or small carbonaceous dust grains), but rather with the exciting radiation field within the region. This is a similar result to that found in the Perseus molecular cloud, another region which harbors AME, suggesting that the radiation field may play a pivotal role in the production of this new Galactic emission mechanism. Finally, we suggest that these observations may hint at the importance of understanding the role played by the major gas ions in spinning dust models.

Tibbs, C. T.; Paladini, R.; Compigne, M.; Dickinson, C.; Alves, M. I. R.; Flagey, N.; Shenoy, S.; Noriega-Crespo, A.; Carey, S.; Casassus, S.; Davies, R. D.; Davis, R. J.; Molinari, S.; Elia, D.; Pestalozzi, M.; Schisano, E.

2012-08-01

236

Bladder-Relaxant Properties of the Novel Benzofuroindole Analogue LDD175  

Microsoft Academic Search

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

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

2009-01-01

237

33 CFR 162.175 - Black Rock Canal and Lock at Buffalo, New York.  

Code of Federal Regulations, 2013 CFR

...175 Black Rock Canal and Lock at Buffalo, New York. In the Black Rock Canal and Lock, no vessel may exceed 6 miles per hour. Note: The Corps of Engineers also has regulations dealing with these areas in 33 CFR Part 207. [CGD...

2013-07-01

238

19 CFR 175.31 - Publication of notice of court decision.  

Code of Federal Regulations, 2013 CFR

...Decision § 175.31 Publication of notice of court decision. Notice of a decision of the Court of International Trade or of the Court of Appeals for the Federal Circuit which sustains, in whole or in part, a cause of action before the...

2013-04-01

239

The Schumann-Runge continuum of oxygen at wavelengths greater than 175 nm  

Microsoft Academic Search

A highly temperature dependent continuum corresponding to absorption by thermally excited molecules underlies the higher bands of the Schumann-Runge system of oxygen. This continuum has been experimentally determined at 18 wavelengths in the range 175 nm to 179 nm, and at temperatures of 90 K and 294 K. Calculations of the continuum cross-section made by solving the Schroedinger equation for

H. P. F. Gies; S. T. Gibson; A. J. Blake; D. G. McCoy

1982-01-01

240

175. Photocopy of photograph, U.S. Army, ca. 1943 (original print ...  

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

175. Photocopy of photograph, U.S. Army, ca. 1943 (original print located at Rocky Mountain Arsenal, Commerce City, Colorado). R.M.A. - 626 - POST ENGINEER LOOKING N.W. - Rocky Mountain Arsenal, Bounded by Ninety-sixth Avenue & Fifty-sixth Avenue, Buckley Road, Quebec Street & Colorado Highway 2, Commerce City, Adams County, CO

241

Stimulated Brillouin scattering pulse compression to 175 ps in a fused quartz at 1064 nm  

NASA Astrophysics Data System (ADS)

Stimulated Brillouin scattering pulse compression of a 2.5 ns laser into a 175 ps pulse using a fused quartz is demonstrated without optical damage. The synchronization and the time jitter between the initial and the compressed pulses were measured (?<80 ps) and analyzed numerically.

Marcus, Gilad; Pearl, Shaul; Pasmanik, Guerman

2008-05-01

242

Random mutagenesis of bacterial luciferase: critical role of Glu175 in the control of luminescence decay  

PubMed Central

Bacterial luciferases (LuxAB) can be readily classed as slow or fast decay luciferases based on their rates of luminescence decay in a single turnover assay. Luciferases from Vibrio harveyi and Xenorhabdus (Photorhabdus) luminescens have slow decay rates, and those from the Photobacterium genus, such as Photobacterium fisheri, P. phosphoreum and P. leiognathi, have rapid decay rates. By substitution of a 67-amino-acid stretch of P. phosphoreum LuxA in the central region of the LuxA subunit, the slow X. luminescens luciferase was converted into a chimaeric luciferase with a significantly more rapid decay rate [Valkova, Szittner and Meighen (1999) Biochemistry 38, 1382013828]. To understand better the role of specific residues in the classification of luciferases as slow and fast decay, we have conducted random mutagenesis on this region. One of the mutants generated by a single mutation on LuxA at position 175 [E175G (Glu175?Gly)] resulted in the slow decay X. luminescens luciferase being converted into a luciferase with a significantly more rapid decay rate. These results indicate the importance of Glu175 in LuxA as a critical residue for differentiating between slow and fast luciferases and show that this distinction is primarily due to differences in aldehyde affinity and in the decomposition of the luciferaseflavinoxygen intermediate.

2004-01-01

243

Measurement of the natLu(p,x)175Hf excitation function  

NASA Astrophysics Data System (ADS)

The natLu(p,x)175Hf excitation function was measured and a maximum cross section of 128 14 mb was observed at a proton energy of 10.6 MeV. The experimentally determined cross sections were compared to theoretical values using the HIVAP and TALYS codes.

Bennett, Megan E.; Mayorov, Dmitriy A.; Chapkin, Kyle D.; Alfonso, Marisa C.; Werke, Tyler A.; Folden, Charles M.

2012-04-01

244

Invasion of human coronary artery endothelial cells by Streptococcus mutans OMZ175  

PubMed Central

Introduction Dissemination of oral bacteria into the bloodstream has been associated with eating, oral hygiene, and dental procedures; including tooth extraction, endodontic treatment, and periodontal surgery. Recently, studies identified Streptococcus mutans, the primary etiological agent of dental caries, as the most prevalent bacterial species found in clinical samples from patients who underwent heart valve and atheromatous plaque surgery. Methods By using antibiotic protection assays, we tested the capacity of 14 strains of S. mutans to invade primary human coronary artery endothelial cells (HCAEC). Results Serotype e strain B14 and serotype f strain OMZ175 of S. mutans were able to efficiently invade HCAEC. Among the tested strains, serotype f S. mutans OMZ175 was the most invasive, whereas strains of serotype c S. mutans, the most prevalent serotype in dental plaque, were not invasive. Based on its high invasion rate, we further investigated the invasive properties of serotype f OMZ175. Using transmission electron microscopy and antibiotic protection assays we demonstrate that S. mutans OMZ175 is capable of attaching to the HCAEC surface, entering the cells and surviving in HCAEC for at least 29 h. Discussion Our findings highlight a potential role for S. mutans in the pathogenesis of certain cardiovascular diseases.

Abranches, J.; Zeng, L.; Belanger, M.; Rodrigues, P. H.; Simpson-Haidaris, P. J.; Akin, D.; Dunn, W. A.; Progulske-Fox, A.; Burne, R. A.

2010-01-01

245

Results of two LANL ? = 0.175, 350MHz, 2-gap spoke cavities  

Microsoft Academic Search

Two ? = 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

T. Tajima; R. L. Edwards; R. C. Gentzlinger; F. L. Krawczyk; J. E. Ledford; J.-F. Liu; D. I. Montoya; R. J. Roybal; D. L. Schrage; A. H. Shapiro; D. Barni; A. Bosotti; C. Pagani; G. Corniani; E. Zanon

2003-01-01

246

Synthesis and Characterization of Ytterbium-filled CoGe1.5Se1.5 compositions  

NASA Astrophysics Data System (ADS)

Polycrystalline skutterudite-related compounds with nominal composition YbCo4Ge6+xSe6-x(0 x 1) were prepared by melting of the constituent elements followed by annealing, and subsequent hot-pressing for densification. Structural and phase characterized was achieved by X-ray diffraction and electron microscopy. The crystal structure of skutterudites allows for voids within the crystal lattice that can be filled by ``guest atoms'' such as ytterbium. It is well known that this guest-atom-filling of the voids can result in significant phonon scattering, although these materials possess relatively good electrical properties, and are therefore thought of as PGEC (Phonon Glass Electron Crystal) materials. The goal of this research was to synthesize these skutterudite-related compounds and examine their thermoelectric properties. Their composition and properties will be discussed.

Hill, Walter; Dong, Yongkwan; Nolas, George S.

2013-03-01

247

Phase-noise properties of an ytterbium-doped fiber amplifier for the Laser Interferometer Space Antenna  

NASA Astrophysics Data System (ADS)

Phase noise is a critical issue for the sensitivity of the interferometric gravitational-wave detector Laser Interferometer Space Antenna that requires laser sources with 1 W of output power. A low-power seed laser with a subsequent fiber amplifier is in discussion, and we report on spectrally resolved phase-noise measurements of an ytterbium-doped fiber amplifier emitting 1 W of output power from 10 mW of seed power. Phase-noise measurements for Fourier frequencies from 10-4 Hz to 100 kHz show 60 rad/Hz0.5 at 10-4 Hz and 0.2 mrad/Hz0.5 at 1 kHz. This measured excess phase noise is orders of magnitude below the free-running phase noise of nonplanar ring oscillators.

Trbs, Michael; Wessels, Peter; Fallnich, Carsten

2005-04-01

248

Switchable mode-locking states in an all-fiber all-normal-dispersion ytterbium-doped laser  

NASA Astrophysics Data System (ADS)

Multi-operation state in an all-normal-dispersion ytterbium-doped fiber laser is obtained by introducing nonlinear polarization or hybrid mode-locking mechanism in the laser cavity. In addition to operating the laser at continuous-wave mode-locking, various operation states including continuous-wave, Q-switched mode-locking, pulse-splitting, and harmonic mode-locking can be achieved by tuning the laser pump power or an intracavity polarization controller. Insertion of a semiconductor saturable absorber mirror in the cavity helps to shorten the output pulsewidth of the hybrid mode-locked laser. When the pump power is rapidly adjusted, a strong asymmetric hysteresis behavior can be observed during the manipulation between different orders of harmonic mode-locking.

Lin, K.-H.; Lin, J.-H.; Chen, C.-C.

2010-11-01

249

Blue electroluminescence of ytterbium clusters in SiO2 by co-operative up-conversion  

NASA Astrophysics Data System (ADS)

Metal-oxynitride-oxide-silicon (MONOS) structures containing a SiO2 layer implanted with different concentrations of ytterbium atoms were investigated. The electroluminescence (EL) measurements show that the MONOS:Yb devices can operate as blue or near infrared light emitters depending on the Yb concentration and annealing time. For an Yb concentration of up to 1.5% and annealing times of 30 min the near infrared EL with a peak at 975 nm corresponding to the 2 F 5/2?2 F 7/2 transition dominates. The short time annealed (6 s) sample containing 3% of Yb atoms exhibits mainly the blue EL due to co-operative up-conversion emission in the Yb3+-Yb3+ system. An enhancement of the red EL at 650 nm due to up-conversion energy transfer from the 2F5/2 excited state to the nonbridging oxygen hole center (NBOHC) is also presented.

Prucnal, S.; Rebohle, L.; Skorupa, W.

2010-02-01

250

Thermo-Optical Tuning of Whispering Gallery Modes in Erbium:Ytterbium Doped Glass Microspheres to Arbitrary Probe Wavelengths  

NASA Astrophysics Data System (ADS)

We present experimental results on an all-optical, thermally-assisted technique for broad range tuning of microsphere cavity resonance modes to arbitrary probe wavelengths. An erbium:ytterbium co-doped phosphate glass (Schott IOG-2) microsphere is pumped at 978 nm via the supporting stem and the heat generated by absorption of the pump light expands the cavity and changes the refractive index. This is a robust tuning method that decouples the pump from the probe and allows fine tuning of the microsphere's whispering gallery modes. Pump/probe experiments were performed to demonstrate thermo-optical tuning to specific probe wavelengths, including the 5S1/2{\\spaceF}= 3 to 5P3/2{\\spaceF'}= 4 laser cooling transition of rubidium-85. This is of particular interest for cavity quantum electrodynamics (QED)-type experiments, while the broad tuning range achievable is useful for integrated photonic devices, including sensors and modulators.

Watkins, Amy; Ward, Jonathan; Chormaic, Sle Nic

2012-05-01

251

Electronic structure of ytterbium-implanted GaN at ambient and high pressure: experimental and crystal field studies.  

PubMed

The results of high-pressure low-temperature optical measurements in a diamond-anvil cell of bulk gallium nitride crystals implanted with ytterbium are reported in combination with crystal field calculations of the Yb(3+) energy levels. Crystal field analysis of splitting of the (2)F(7/2) and (2)F(5/2) states has been performed, with the aim of assigning all features of the experimental luminescence spectra. A thorough analysis of the pressure behavior of the Yb(3+) luminescence lines in GaN allowed the determination of the ambient-pressure positions and pressure dependence of the Yb(3+) energy levels in the trigonal crystal field as well as the pressure-induced changes of the spin-orbit coupling coefficient. PMID:22322935

Kaminska, A; Ma, C-G; Brik, M G; Kozanecki, A; Bo?kowski, M; Alves, E; Suchocki, A

2012-02-09

252

Ytterbium-sensitized Thulium-doped fiber laser in the near-IR with 980 nm pumping.  

PubMed

The use of an unidirectional auxiliary pump at approximately 1600 nm in conjunction with a 980 nm primary pump for Ytterbium (Yb(3+))-sensitized-Thulium (Tm(3+))-doped single mode silica fiber (YTDF) is found to be very effective to activate the most significant resonance energy transfer from Yb(3+) to Tm(3+), in order to obtain significant emission in the near-infrared. The resulting laser performance of the YTDF at 1874 nm is reported here. The influence of the Tm(3+)/Yb(3+) concentration, their relative proportions and the host glass composition on the lasing efficiency has also been investigated to optimize the fiber parameters for maximum laser output power. PMID:20389519

Pal, Atasi; Dhar, Anirban; Das, Shyamal; Chen, Shu Ying; Sun, Tong; Sen, Ranjan; Grattan, Kenneth T V

2010-03-01

253

High-power nanosecond ytterbium-doped fiber laser passively synchronized with a femtosecond Ti:sapphire laser.  

PubMed

We report on laser synchronization between a high-power nanosecond fiber laser and an ultrashort Ti:sapphire laser by cross-absorption modulation and power amplification. The nanosecond pulses were generated by a long-cavity ytterbium-doped fiber laser that was passively synchronized to a 70 fs Ti:sapphire laser with a remarkable cavity mismatch tolerance of about 8 cm as a result of resonance-enhanced cross-absorption modulation in additional rare-earth-doped fiber. By using a two-stage Yb-doped fiber preamplifier and a two-stage double-clad fiber power amplifier in cascade, the synchronized nanosecond pulses were amplified to 131 W of average power, corresponding to 0.55 mJ of single-pulse energy at a repetition rate of 240 KHz, with a timing jitter of 13 ps. PMID:19881584

Yan, Ming; Li, Wenxue; Hao, Qiang; Li, Yao; Yang, Kangwen; Zhou, Hui; Zeng, Heping

2009-11-01

254

175 GMACS\\/mW Charge-Mode Adiabatic Mixed-Signal Array Processor  

Microsoft Academic Search

An adiabatic charge-recycling mixed-signal array with integrated resonant clock generator delivers 175 GMACS (multiply-and-accumulates per second) throughput for every mW of power, a ten-fold improvement over the dynamic power incurred when resonant line drivers are replaced with CMOS drivers. The 3-T CID\\/DRAM cell provides non-destructive 1b-1b multiply accumulation, and integrated quantizers yield 8-bit outputs with +\\/- 1 LSB worst-case mismatch.

Rafal Karakiewicz; Roman Genov; Adeel Abbas; Gert Cauwenberghs

2006-01-01

255

A Compound Refractive Lens for 175 keV X-rays  

Microsoft Academic Search

This is to report on the second step in constructing Compound Refractive Lens for focusing 175 keV X-rays for Magnetic Compton Scattering experiment at the BL08W beamline in SPring-8. The lens consists of the metallic plates with small parabolic grooves pressed into it. The first lens for this high energy was made of Fe. Recently we have performed a test

Andrzej Andrejczuk; Yoshiharu Sakurai; Masayoshi Itou

2007-01-01

256

Highlights of the reaction ?-p-->?-?+n at 100 and 175 GeV/c  

NASA Astrophysics Data System (ADS)

We present a summary of the physics results from an experimental study of the reaction ?-p-->?-?+n at 100 and 175 GeV/c incident-beam momentum. Our data show the continuing dominance of one-pion exchange in these reactions with the characteristic 1Plab2 momentum dependence. We extract the pion Regge trajectory from our data on ?-p-->?0n and study the zero structure of the ?? differential cross section up to s??=12 GeV2.

Bromberg, C.; Dickey, J. O.; Fox, G. C.; Gomez, R.; Kropac, W.; Pine, J.; Stampke, S. R.; Haggerty, H.; Malamud, E.; Abrams, R.; Delzenero, R.; Goldberg, H.; Lopez, F.; Margulies, S.; McLeod, D.; Solomon, J.; Dzierba, A.; Fredericksen, F.; Heinz, R.; Krider, J.; Martin, H.; Petersen, D.

1984-02-01

257

Operation of 17.5 T superconducting magnet system in the last 8 years  

Microsoft Academic Search

A 17.5 T hybrid superconducting magnet with an outer NbSn section and an inner VGa section was installed at National Research Institute for Metals (Japan) at the beginning of 1976. Since then the magnet system has been successfully operated about 60 times without any trouble. The magnet still generates the world-highest field in the superconducting state. Ordinarily, it is cooled

K. Tachikawa; Y. Tanaka; K. Inoue; K. Inove; T. Asano; Y. Iijima

1985-01-01

258

25 CFR 175.13 - Procedures for adjusting electric power rates to reflect changes in the cost of purchased power...  

Code of Federal Regulations, 2011 CFR

...reflect changes in the cost of purchased power or energy. 175.13 Section 175.13 Indians...reflect changes in the cost of purchased power or energy. Whenever the cost of purchased power or energy changes, the effect of the change on...

2011-04-01

259

25 CFR 175.12 - Procedures for adjusting electric power rates except for adjustments due to changes in the cost...  

Code of Federal Regulations, 2011 CFR

...changes in the cost of purchased power or energy. 175.12 Section 175.12 Indians...changes in the cost of purchased power or energy. Except for adjustments to rates due to changes in the cost of purchased power or energy, the Area Director shall adjust...

2011-04-01

260

Frequency doubling of a tunable ytterbium-doped fibre laser in KTP crystals phase-matched in the XY and YZ planes  

SciTech Connect

This paper presents an experimental study of frequency doubling of a tunable ytterbium-doped fibre laser in KTP crystals phase-matched in the XY and YZ planes. In the XY plane, we obtained continuous tuning in the range 528 - 540 nm through intracavity frequency doubling. The second-harmonic power reached 450 mW for 18 W of multimode diode pump power, which was five times higher in comparison with single-pass frequency doubling. In a single-pass configuration in the YZ plane, we obtained a wide tuning range (527 - 551 nm) in the green spectral region and a second-harmonic power of {approx}10 mW. The tuning range was only limited by the mechanical performance of the fibre Bragg grating and can potentially be extended to the entire lasing range of the ytterbium-doped fibre laser.

Akulov, V A; Kablukov, S I; Babin, Sergei A

2012-02-28

261

Frequency doubling of a tunable ytterbium-doped fibre laser in KTP crystals phase-matched in the XY and YZ planes  

NASA Astrophysics Data System (ADS)

This paper presents an experimental study of frequency doubling of a tunable ytterbium-doped fibre laser in KTP crystals phase-matched in the XY and YZ planes. In the XY plane, we obtained continuous tuning in the range 528 540 nm through intracavity frequency doubling. The second-harmonic power reached 450 mW for 18 W of multimode diode pump power, which was five times higher in comparison with single-pass frequency doubling. In a single-pass configuration in the YZ plane, we obtained a wide tuning range (527 551 nm) in the green spectral region and a second-harmonic power of ~10 mW. The tuning range was only limited by the mechanical performance of the fibre Bragg grating and can potentially be extended to the entire lasing range of the ytterbium-doped fibre laser.

Akulov, V. A.; Kablukov, S. I.; Babin, Sergei A.

2012-02-01

262

Efficient alcoholysis of 5,6-dihydro-1,10-phenanthroline-5,6-epoxide with ytterbium(III) triflate and subsequent enantioselective transesterification with lipases  

PubMed Central

New 5,6-dihydro-1,10-phenanthroline derivatives were prepared in high yield via ytterbium(III) triflate-catalyzed alcoholysis of the corresponding epoxide. Enzymatic transesterifications of racemic alkoxy alcohols afforded enantioselective separations with up to 99% ee. The lipase derived from Burkholderia cepacia (PSCI) was the most efficient, with E-values of up to 200. The steric effect of substituents in the 6-position on reaction time and enantioselectivities was assessed.

Schoffers, Elke; Kohler, Lars

2009-01-01

263

Nonmonotonic dependence of the work function of ytterbium nanofilms deposited on the Si(111)7 7 surface at room temperature on the film thickness  

NASA Astrophysics Data System (ADS)

The dependences of the work function of ytterbium nanofilms on their thickness are studied. The films are evaporated at room temperature on the Si(111)7 7 surface of silicon samples doped to different levels and having different types of conduction ( n and p). It is shown that these dependences exhibit a pronounced nonmonotonic behavior, which does not depend on the type of silicon used. It is established that the amplitude of the nonmonotonic variations in the work function is governed by the surface microroughness of the deposited layers, so that larger amplitudes correspond to smoother films. The variations in the work function of the films due to the deposition of electrically negative Si atoms on their surface are investigated. It is revealed that the sign of the variation depends on the film thickness. This result strange at first glance is associated with the fact that the electron density distribution at the metal-film-vacuum interface depends nonmonotonically on the amount of deposited ytterbium. This nonmonotonic behavior is a manifestation of electron density standing waves (Friedel oscillations) generated in the films by the ytterbium-silicon interface.

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

2008-02-01

264

TEST RESULTS OF THE LANL 350 MHZ, BETA=0.175, 2-GAP SPOKE RESONATOR.  

SciTech Connect

Two 350-MHz ? = 0.175 two-gap superconducting (SC) spoke resonator cavities have been fabricated in industry under an R&D project for the Advanced Accelerator Applications (AAA) program at LANL. This paper describes the structure, presents the test results of mechanical properties, tuning sensitivity at room temperature, and Q- E curves at 4 K. A maximum accelerating field of 11.6 MV/m has been obtained, which exceeds our present goal of 7.5 MV/m with ample margin

Tajima, Tsuyoshi; Gentzlinger, Robert C.; Roybal, Ray J.; Krawczyk, Frank L.; Schrage, Dale L.; Ledford, John; Montoya, Debbie I.; Shapiro, Alan H.; Barni, Danilo; Bissotti, Angelo; Pagani, Carlo

2002-08-16

265

Geological, chemical, and biological evidence for recent volcanism at 17.5S: East Pacific Rise  

NASA Astrophysics Data System (ADS)

The superfast-spreading portion of the East Pacific Rise at 17.5S is a magmatically robust section of mid-ocean ridge. Plumes characterized by high volatile/metal ratios, which has been hypothesized to be indicative of recent magmatism, were found between 1722'S and 1735'S in November-December 1993. Dives with the French submersible Nautile in December 1993 observed young sheet flows and widespread venting centered on the segment's shoalest point at 1726'S. Eight submersible dives made one year later with the Japanese submersible Shinkai 6500 in September-November 1994 found glassy, unsedimented lavas, a range of diffuse and high-temperature vents, and several types of biologic communities on the ridge crest beneath the volatile-rich 1993 plumes. The diffuse vents range from small areas in the youngest lavas characterized by very low-temperature flow (<10C) and a relatively low macrofaunal diversity, to larger areas where the (apparent) older surface was covered with a dense and diverse biotope including anemones, tubeworms, mussels and serpulids. Several inactive vents marked by dead mussel/clam beds are present in the southernmost portion of the site in the older lavas. Submersible mapping indicates that the youngest lava (L0 unit) erupted for at least 4 km along the strike of the ridge at the southern site, and for 5-10 km at the northern site. The flow is up to 400 m in width at the southern site and may be as much as 1-2 km in width at the northern site. Comparison of the observed 1993 Fe/S, H 2S/heat, and 3He/heat plume values with time series measurements at sites on the northern East Pacific Rise and the Juan de Fuca Ridge, where the onset of the magmatic event is known, implies that the last magmatic event at 17.5'S occurred within several years prior to 1993. Continued rapid cooling of the underlying heat source is implied from the significant diminishment in the light-scattering intensity and rise height of the overlying plumes recorded during 1994 submersible dives. The type and diversity of the vent biota found on the L0 vents also suggests a young system. The spatial and temporal scales of the accretion event at the 17.5S EPR site are similar in scale to eruptions on the intermediate-rate spreading North Cleft segment (Juan de Fuca Ridge) but the 17.5S event has more subtle gradients in the effusion rate of the eruptions and thermal and chemical character of the hydrothermal system.

Embley, R. W.; Lupton, J. E.; Massoth, G.; Urabe, T.; Tunnicliffe, V.; Butterfield, D. A.; Shibata, T.; Okano, O.; Kinoshita, M.; Fujioka, K.

1998-11-01

266

Allelic dimorphism of the erythocyte binding antigen-175 (eba-175) gene of Plasmodium falciparum and severe malaria: Significant association of the C-segment with fatal outcome in Ghanaian children  

Microsoft Academic Search

BACKGROUND: The erythrocyte binding antigen-175 (EBA-175) on Plasmodium falciparum merozoites mediates sialic acid dependent binding to glycophorin A on host erythrocytes and, therefore, plays a crucial role in cell invasion. Dimorphic allele segments have been found in its encoding gene with a 342 bp segment present in FCR-3 strains (F-segment) and a 423 bp segment in CAMP strains (C-segment). Possible

Jakob P Cramer; Frank P Mockenhaupt; Ingo Mhl; Sabine Dittrich; Ekkehardt Dietz; Rowland N Otchwemah; Stephan Ehrhardt; Ulrich Bienzle; Tomas Jelinek

2004-01-01

267

Defect-Structure of Ytterbium(III) Doped Na2SO4 Phase I  

NASA Astrophysics Data System (ADS)

Single crystals of Na1.75Yb0.08SO4, Na1.82Y0.06SO4, and Na1.70Ln0.10SO4 (Ln3+=La, Yb), were grown at 1300 K by the Czochralski method. The Yb3+ and Y3+ substituted crystals transform upon cooling to a monoclinic phase intergrown in a twin relationship. However, the high-temperature defect structure of Na2SO4 type I can be supercooled by annealing at 1000 K and subsequent quenching. (La,Yb)-bearing crystals preserve even after moderate cooling hexagonal symmetry of Na2SO4 type I but display very weak and diffuse superstructure reflections indicating tripling of the c-axis. After annealing at 1000 K and subsequent quenching the superstructure reflections disappear and the (La, Yb)-substituted crystals exhibit slightly contracted cell dimensions (a=5.331(1), c=7.188(1) ) compared to the slowly cooled crystals with the same composition (a=5.3472(5), c=7.2102(6) ). The crystal structures of all synthesized hexagonal crystals were determined from room temperature single-crystal X-ray data and refined in space group P63/mmc. The corresponding refined structures are strongly related to the high temperature phase I of pure Na2SO4 but display additional SO4 orientations correlated with the amount of substituted Y3+ and Ln3+ on Na1 and also with the number of cation vacancies on Na2 and Na3. The structures reveal a disordered arrangement of five different SO4 orientations. If a (La,Yb)-substituted crystal is rapidly quenched from 1000 K, Ln3+ is concentrated together with Na at the Na1 site whereas upon slow cooling some Ln3+ diffuses to Na2.

Armbruster, Thomas; Basler, Reto; Mikhail, Patric; Hulliger, Jrg

1999-06-01

268

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

SciTech Connect

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.

Pollari, R.A.

1995-02-01

269

41 CFR 102-33.175 - What standards must we establish or require (contractually, where applicable) to train our flight...  

Code of Federal Regulations, 2011 CFR

... Public Contracts and Property Management Federal Property Management Regulations System (Continued) FEDERAL MANAGEMENT REGULATION PERSONAL PROPERTY...Government Aircraft and Aircraft Parts Training § 102-33.175 What...

2013-01-01

270

5 CFR 1201.175 - Judicial review of cases decided under 5 U.S.C. 7702.  

Code of Federal Regulations, 2013 CFR

...PROCEDURES Procedures for Cases Involving Allegations of Discrimination...175 Judicial review of cases decided under 5 U.S.C...appropriate United States district court is authorized to conduct all judicial review of cases decided under 5...

2013-01-01

271

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

Code of Federal Regulations, 2013 CFR

... 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...

2013-04-01

272

49 CFR 175.706 - Separation distances for undeveloped film from packages containing Class 7 (radioactive) materials.  

Code of Federal Regulations, 2012 CFR

...packages containing Class 7 (radioactive) materials. 175.706 Section...packages containing Class 7 (radioactive) materials. No person may...aircraft any package of Class 7 (radioactive) materials required by §...

2012-10-01

273

49 CFR 175.706 - Separation distances for undeveloped film from packages containing Class 7 (radioactive) materials.  

Code of Federal Regulations, 2011 CFR

...packages containing Class 7 (radioactive) materials. 175.706 Section...packages containing Class 7 (radioactive) materials. No person may...aircraft any package of Class 7 (radioactive) materials required by §...

2011-10-01

274

25 CFR 175.13 - Procedures for adjusting electric power rates to reflect changes in the cost of purchased power...  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Procedures for adjusting electric power rates to reflect changes in the cost...OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees, Electric Power Rates and Revenues § 175.13...

2013-04-01

275

25 CFR 175.12 - Procedures for adjusting electric power rates except for adjustments due to changes in the cost...  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Procedures for adjusting electric power rates except for adjustments due to...OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees, Electric Power Rates and Revenues § 175.12...

2013-04-01

276

41 CFR 102-73.175 - What types of special purpose space may the Department of Commerce lease?  

Code of Federal Regulations, 2013 CFR

... false What types of special purpose space may the Department of Commerce lease... Acquisition by Lease Special Purpose Space Delegations § 102-73.175 What types of special purpose space may the Department of Commerce...

2013-01-01

277

40 CFR 270.175 - For what reasons may the Director choose to modify my final RAP?  

Code of Federal Regulations, 2012 CFR

40 Protection of Environment 28 2012-07-01 2012-07-01...Section 270.175 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY...RAP endangers human health or the environment and can only be remedied by...

2012-07-01

278

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

Code of Federal Regulations, 2010 CFR

...2009-07-01 false What types of support does GSA offer to Federal agency mail management programs? 102-192.175...offer to Federal agency mail management programs? GSA supports Federal agency mail management programs by (a)...

2009-07-01

279

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 false What types of support does GSA offer to Federal agency mail management programs? 102-192.175...offer to Federal agency mail management programs? GSA supports Federal agency mail management programs by (a)...

2010-07-01

280

Response surface method based optimization of ytterbium fiber laser parameter during machining of Al/Al2O3-MMC  

NASA Astrophysics Data System (ADS)

This paper presents the investigated results on machining of Al/Al2O3-MMC by ytterbium fiber laser. The effects of the different parameters on the response characteristics are explained. A comprehensive mathematical models for correlating the interactive and higher-order influences of various machining parameters such as laser power, modulation frequency, gas pressure, wait time, pulse width on the machining performance criteria e.g., metal removal rate and tapering phenomena has been developed for achieving controlled over fiber laser machining process. The response surface methodology (RSM) is employed to achieve optimum responses i.e., minimum tapering and maximum material removal rate. The parameters wait time and modulation frequency are identified as the most significant and significant parameters for MRR. Modulation frequency range from 600 to 680 Hz taper is minimum. The optimal parametric combination for maximized MRR and minimized taper is identified as 473.12 W laser power, 604.54 Hz modulation frequency, 0.18 s wait time, 19.82 bar assist gas pressure and 93.47% of duty cycle pulse width and finally confirmation tests are conducted to validate the developed models.

Ghosal, Arindam; Manna, Alakesh

2013-03-01

281

Temperature-dependent fluorescence characteristics of an ytterbium-sensitized erbium-doped silica fiber for sensor applications  

NASA Astrophysics Data System (ADS)

The characteristics of temperature-dependent fluorescence of an ytterbium (Yb3+)-sensitized erbium (Er3+)-doped silica fiber are presented. A 10-cm long double-clad Yb3+/Er3+-codoped fiber is diode-pumped at 915 nm and the individual fluorescence intensities from Yb3+ and Er3+ ions are measured with varying the fiber temperature. The ratio of the dual fluorescence intensities varies exponentially with temperature in the range of room temperature to 300?C. This dual-dopant system has dual emission bands that emit comparable fluorescence powers. Particularly, the self-referencing fluorescence intensity ratio is insensitive to external perturbations in the fiber, which is useful for sensors that are used in a harsh environment without any use of additional referencing techniques. This scheme allows a compact, long-life, and low-cost temperature sensor and can also be combined with a wide range of existing fiber-optic multiplexing schemes that can simultaneously detect multiple physical parameters.

Baek, Seungin; Jeong, Yoonchan; Nilsson, Johan; Sahu, Jayanta K.; Lee, Byoungho

2006-01-01

282

Extreme nitrogen enrichment in the asymmetrical planetary nebulae M1-75  

NASA Astrophysics Data System (ADS)

In the framework of the morphological survey of northern sky planetary nebulae, in progress at the IAC we investigate in detail those nebulae that show peculiarities or that have not been studied before. By means of narrowband imaging and accurate two-dimensional spectroscopy we analyzed the peculiar nebula M1-75. Its morphology is very complex, consisting of two contiguous shells, surrounded by two previously undetected fainter lobes. Detailed plasma analysis showed an extreme nitrogen enrichment in the outmost shell (N/O = 2.85), as well as high helium abundance (He/H = 0.18), making this object a good candidate for peculiar stellar evolutionary paths. The detected abundances for heavy elements are among the highest ever detected in a galactic planetary nebulae.

Guerrero, Martin A.; Stranghellini, Letizia; Manchado, Arturo

1995-05-01

283

First observation of excited states in {sup 175}Hg{sub 95}  

SciTech Connect

Excited states of the neutron-deficient nucleus {sup 175}Hg, populated using fusion-evaporation reactions, are reported for the first time. The spin and parity of the ground state has been determined to be I{sup {pi}}=7/2{sup -} through measurements of the {alpha} decay to the daughter nucleus {sup 171}Pt. A structure based on an isomeric state [T{sub 1/2}=0.34(3) {mu}s] with I{sup {pi}}=13/2{sup +} and its decay path to the ground state have been established. The observed structures are interpreted in terms of single-particle configurations, and the trends of coexisting shapes in neighboring nuclei are discussed.

O'Donnell, D.; Simpson, J.; Labiche, M. [STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD (United Kingdom); Scholey, C.; Greenlees, P. T.; Jakobsson, U.; Jones, P.; Julin, R.; Juutinen, S.; Ketelhut, S.; Leino, M.; Nyman, M.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Saren, J.; Uusitalo, J. [Department of Physics, University of Jyvaeskylae, P. O. Box 35, FI-40014, Jyvaeskylae (Finland); Baeck, T. [Department of Physics, Royal Institute of Technology, Stockholm SE-10691 (Sweden); Joss, D. T.; Judson, D. S. [Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE (United Kingdom)] (and others)

2009-05-15

284

Sagebrush Rebellion. [Proposed transfer of 175 million acres of Federal lands to states  

SciTech Connect

The Sagebrush Rebellion concerns a proposal to transfer 175 million acres of Federally-owned wildlands to state governments, an idea with political appeal for many an opportunity to replace decades of conservation and wilderness planning with development and speculation. The project is seen as a way to grab public lands for private profit, its supporters largely drawn from the group which will gain either financially or politically. The movement grew out of government efforts to cut back on overgrazing on public lands and alert the public to the environmental impacts of grazing policies. Although legislative efforts have not succeeded, the movement has hindered the Bureau of Land Management and has championed private interests to the point where use violations and efforts to discredit government management are flagrant. A concerted lobbying effort is called for to prevent a massive land transfer. (DCK)

Shay, R.

1980-01-01

285

A Compound Refractive Lens for 175 keV X-rays  

SciTech Connect

This is to report on the second step in constructing Compound Refractive Lens for focusing 175 keV X-rays for Magnetic Compton Scattering experiment at the BL08W beamline in SPring-8. The lens consists of the metallic plates with small parabolic grooves pressed into it. The first lens for this high energy was made of Fe. Recently we have performed a test on the lens made of Ni and found that it has a focal length of 2.6 m with a size of 9 microns in FWHM. The focused beam is still weaker than the designed value, but it has already achieved two times higher density than unfocused beam.

Andrejczuk, Andrzej; Sakurai, Yoshiharu; Itou, Masayoshi [Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)

2007-01-19

286

Structural and Functional Basis for Inhibition of Erythrocyte Invasion by Antibodies that Target Plasmodium falciparum EBA-175  

PubMed Central

Disrupting erythrocyte invasion by Plasmodium falciparum is an attractive approach to combat malaria. P. falciparum EBA-175 (PfEBA-175) engages the host receptor Glycophorin A (GpA) during invasion and is a leading vaccine candidate. Antibodies that recognize PfEBA-175 can prevent parasite growth, although not all antibodies are inhibitory. Here, using x-ray crystallography, small-angle x-ray scattering and functional studies, we report the structural basis and mechanism for inhibition by two PfEBA-175 antibodies. Structures of each antibody in complex with the PfEBA-175 receptor binding domain reveal that the most potent inhibitory antibody, R217, engages critical GpA binding residues and the proposed dimer interface of PfEBA-175. A second weakly inhibitory antibody, R218, binds to an asparagine-rich surface loop. We show that the epitopes identified by structural studies are critical for antibody binding. Together, the structural and mapping studies reveal distinct mechanisms of action, with R217 directly preventing receptor binding while R218 allows for receptor binding. Using a direct receptor binding assay we show R217 directly blocks GpA engagement while R218 does not. Our studies elaborate on the complex interaction between PfEBA-175 and GpA and highlight new approaches to targeting the molecular mechanism of P. falciparum invasion of erythrocytes. The results suggest studies aiming to improve the efficacy of blood-stage vaccines, either by selecting single or combining multiple parasite antigens, should assess the antibody response to defined inhibitory epitopes as well as the response to the whole protein antigen. Finally, this work demonstrates the importance of identifying inhibitory-epitopes and avoiding decoy-epitopes in antibody-based therapies, vaccines and diagnostics.

Chen, Edwin; Paing, May M.; Salinas, Nichole; Sim, B. Kim Lee; Tolia, Niraj H.

2013-01-01

287

Fundamental-mode operation in polarization-maintaining ytterbium-doped fiber with an effective area of 1400 micro m2.  

PubMed

We report, for the first time to our knowledge, fundamental-mode operation in polarization-maintaining ytterbium-doped fiber with an effective area of approximately 1400 micro m(2) and birefringence of 2.1 x 10(-4). The measured critical bending radius, R(c), defined as the radius at which the loss is equal to 3 dB for 1 m of fiber, is approximately 4 cm. Lasing with slope efficiency exceeding 60% and M(2) of 1.2 has also been demonstrated. PMID:17356652

Peng, Xiang; Dong, Liang

2007-02-15

288

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

PubMed

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

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

2009-08-31

289

Measurement of atomic oscillator strengths in ytterbium by observation of coherent Rabi oscillations of excited-state populations  

SciTech Connect

Two methods have been used to measure the oscillator strength of the transition between the ground and 17,992 cm level in XUYb. The first technique involves exciting the transition with a laser pulse that is nearly time-bandwidth limited, of uniform intensity, and has a reproducible shape from shot to shot. The population left in the excited state after the pulse varies sinusoidally with a period that depends on the integral over time of the electric field amplitude and the transition oscillator strength. These are the Rabi oscillations that are predicted by application of the Schrodinger equation to the two-level atom. The second method involves observation of the polarization rotation of a set of degenerate sublevels brought about by a light-shift laser. One sublevel (m/sub j/ = 0) of the J = 1 level at 17,992 cm is populated by a linearly polarized laser. A second copropagating light-shift laser, which is linearly polarized at an angle to the first laser, is tuned between 7.5 and 30 GHz off-resonance with the transition. The light-shift laser causes population to be promoted into the m/sub j/ = +-1 levels through the virtual J = 0, m/sub j/ = 0 level. Two linearly polarized photoionizing lasers photoionize the population only from the m/sub j/ = +-1 levels. The photoion signal oscillates cosinusoidally with a period that depends only on the integrated pulse intensity, the laser detuning, and the transition oscillator strength. Finally, polarization selectivity has been shown experimentally to allow selective photoionization of the odd isotopes of ytterbium using broadband lasers.

Haynam, C.A.; Comaskey, B.J.; Worden, E.F.; Paisner, J.A.

1987-01-01

290

Single-phase and well-dispersed Cu1.75S nanocrystals by ambient pressure diethylene glycol solution synthesis  

NASA Astrophysics Data System (ADS)

Single-phase, well-dispersed Cu1.75S nanocrystals were synthesized by an ambient pressure, hydrazine hydrate and ethylenediamine co-assisted diethylene glycol based solution chemical process using copper chloride and thioacetamide as precursors at the temperature range from 180 to 210 C. Influence of hydrazine hydrate and ethylenediamine adding amounts, synthetic temperature on crystal growth, size distribution and optical properties of the synthesized Cu1.75S nanocrystals were investigated by XRD, TEM, HRTEM, EDX and UV-vis measurements. The synthetic reaction at above 200 C grew flaky-shaped nanocrystals with relatively narrow size distribution. The formation of single-phase Cu1.75S nanocrystals in the diethylene glycol based solution process might be involved in the presence of intermediate [Cu(en)n]1+ and [Cu(NH3)4]2+ complexes in reaction solution, providing a stable Cu(I) and Cu(II) valent-mixed precursor.

Zheng, Xuerong; Jin, Zhengguo; Liu, Hui; Wang, Yueqiu; Wang, Xin; Du, Haiyan

2013-02-01

291

Coordinate phosphorylation of insulin-receptor kinase and its 175,000-Mr endogenous substrate in rat hepatocytes  

SciTech Connect

To investigate the early events in insulin signal transmission in liver, isolated rat hepatocytes were labeled with {sup 32}P, and proteins phosphorylated in response to insulin were detected by immunoprecipitation with anti-phosphotyrosine and anti-receptor antibodies and analyzed by sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis and autoradiography. In these cells, insulin rapidly stimulated tyrosine phosphorylation of the 95,000-Mr beta-subunit of the insulin receptor and a 175,000-Mr phosphoprotein (pp175). Both proteins were precipitated by anti-phosphotyrosine antibody, whereas only the insulin receptor was recognized with anti-insulin-receptor antibody. In the insulin-stimulated state, both pp175 and the receptor beta-subunit were found to be phosphorylated on tyrosine and serine residues. Based on precipitation by the two antibodies, receptor phosphorylation was biphasic with an initial increase in tyrosine phosphorylation followed by a more gradual increase in serine phosphorylation over the first 30 min of stimulation. The time course of phosphorylation of pp175 was rapid and paralleled that of the beta-subunit of the insulin receptor. The pp175 was clearly distinguished from the insulin receptor, because it was detected only when boiling SDS was used to extract cellular phosphoproteins, whereas the insulin receptor was extracted with either Triton X-100 or SDS. In addition, the tryptic peptide maps of the two proteins were distinct. The dose-response curve for insulin stimulation was shifted slightly to the left of the insulin receptor, suggesting some signal amplification at this step. These data suggest that pp175 is a major endogenous substrate of the insulin receptor in liver and may be a cytoskeletal-associated protein.

Okamoto, M.; Karasik, A.; White, M.F.; Kahn, C.R. (Joslin Diabetes Center, Boston, MA (USA))

1991-01-01

292

Properties of FIRBACK-ELAIS 175-?m sources in the ELAIS N2 region  

NASA Astrophysics Data System (ADS)

We report on a search for the optical counterparts of 175-?m 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 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 (SEDs) 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 starburst galaxies with their starburst component at a high optical depth. The resulting SEDs were used to estimate far-infrared luminosities, star formation rates (SFRs), dust temperatures and dust masses. The N2 FIRBACK population is found to consist of four suspected ultraluminous infrared galaxies (ULIRGs) with LFIR~ 1012Lsolar and SFRFIR > 100Msolaryr-1, a number of luminous infrared galaxies (LIRGs) with moderate star formation rates and LFIR~ 1011Lsolar and a population of low-redshift quiescently star-forming galaxies. We also discuss the implications of these results for current evolutionary models.

Taylor, E. L.; Mann, R. G.; Efstathiou, A. N.; Babbedge, T. S. R.; Rowan-Robinson, M.; Lagache, G.; Lawrence, A.; Mei, S.; Vaccari, M.; Hraudeau, Ph.; Oliver, S. J.; Dennefeld, M.; Perez-Fournon, I.; Serjeant, S.; Gonzlez-Solares, E.; Puget, J.-L.; Dole, H.; Lari, C.

2005-08-01

293

42 CFR 137.175 - Is a Self-Governance Tribe required to maintain a recordkeeping system?  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Is a Self-Governance Tribe required to maintain a recordkeeping...AND HUMAN SERVICES TRIBAL SELF-GOVERNANCE Operational Provisions Records § 137.175 Is a Self-Governance Tribe required to maintain a...

2011-10-01

294

Bortezomib induces apoptosis of endometrial cancer cells through microRNA-17-5p by targeting p21.  

PubMed

Bortezomib suppresses ubiquitin (Ub)-dependent protein degradation and preferentially kills various tumour cells in vitro and in animal models. However, its mechanism of action is not fully understood. We report that bortezomib inhibits the proliferation and proteasomal activity of human endometrial cancer cells and induces G2/M arrest and apoptosis by modulating the miRNA level. By miRNA microarray, iR-17-5p was the most downregulated of all those in HTB-111 and Ishikawa cells after bortezomib treatment. This observation was confirmed by quantitative real-time PCR (qRT-PCR). Target prediction using TargetScan software identified p21 as a potential target for miR-17-5p, which was confirmed by luciferase reporter, qRT-PCR and Western blot assays. The transfection of miR-17-5p mimics or siRNA-p21 reversed the effect of bortezomib on HTB-111 and Ishikawa cells, indicating that miR-17-5p may mediate the function of bortezomib by targeting p21 in endometrial cancer cells. These findings show novel mechanisms by which bortezomib inhibits proliferation and promotes the apoptosis of human endometrial cancer cells. PMID:23716467

Shen, Yuan; Lu, Lin; Xu, Jianping; Meng, Wei; Qing, Yanwei; Liu, Yuan; Zhang, Bei; Hu, Haiyan

2013-06-24

295

Paleoclimatic changes in southern Africa during the intensification of Northern Hemisphere glaciation: evidence from ODP Leg 175 Site 1085  

Microsoft Academic Search

Pliocene age sediments from Ocean Drilling Program Leg 175, Site 1085-A and B in the Cape Basin were analyzed to investigate the impact of the intensification of Northern Hemisphere glaciation (INHG) on the South Atlantic Benguela Current system from 4 to 2 Ma. Proxies for productivity (concentrations and mass accumulation rates of total organic carbon, carbon to nitrogen ratios, percent

B. A. Christensen; J. L. Kalbas; M. Maslin; R. W. Murray

2002-01-01

296

Saccharomyces cerevisiae cells lacking the homologous pairing protein p175 SEP1 arrest at pachytene during meiotic prophase  

Microsoft Academic Search

Saccharomyces cerevisiae cells containing null mutations in the SEP1 gene, which encodes the homologous pairing and strand exchange protein p175SEP1 enter pachytene with a delay. They arrest uniformly at this stage of meiotic prophase, probably revealing a checkpoint in the transition from pachytene to meiosis I. At the arrest point, the cells remain largely viable and are cytologically characterized by

Jrg Bhler; Gerrit Hagens; Gudrun Holzinger; Harry Scherthan; Wolf-Dietrich Heyer

1994-01-01

297

Green Bank Telescope 290 to 395 MHz Feed Analysis and Modification for Operation in the 140 to 175 MHz Band.  

National Technical Information Service (NTIS)

A previously developed 290 to 395 MHz short backfire antenna feed for the Green Bank Telescope (GBT) has been modified for operation in the 140 to 175 MHz VHF band. The feed has been modeled with the Electromagnetic Surface Patch code, Version 5 (ESP5) so...

A. J. Fenn S. Ikanth

2003-01-01

298

Pem for Filters, Upper Sideband (1.75 mc.) Quartz Crystals Type El-Fr (X-1).  

National Technical Information Service (NTIS)

The capability is to be established of manufacturing upper-sideband (1.75-mc) quartz crystal filters of the type EL-FR (X-) that is designed to provide uppersideband selection in equipment such as the AN/GRC-106. The filter 2-db bandwidth is about 3.2 kc....

1964-01-01

299

21 CFR 175.380 - Xylene-formaldehyde resins condensed with 4,4-isopropylidenediphenol-epichlorohydrin epoxy resins.  

Code of Federal Regulations, 2013 CFR

... 2013-04-01 false Xylene-formaldehyde resins condensed with 4,4â...of Coatings § 175.380 Xylene-formaldehyde resins condensed with 4,4-isopropylidenediphenol-epichlorohydrin...produced by the condensation of xylene-formaldehyde resin and...

2013-04-01

300

A CANDIDATE DUAL ACTIVE GALACTIC NUCLEUS AT z = 1.175  

SciTech Connect

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.

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

301

Heat flux through an old (175 Ma) passive margin: Offshore southeastern United States  

NASA Astrophysics Data System (ADS)

New heat flow data on the southeastern United States passive margin show that measured, uncorrected flux averages 4911.8 mW m-2 through old (175 Ma) oceanic crust. Nonuniform thermal gradients were measured at about half of the 114 penetrations that comprise the data set and over the full range of water depths (1900 m to 4250 m) at which data were collected. With the simplifying assumption that the nonuniform gradients were caused by a step function change in bottom water temperatures at some time before the heat flow cruises, concave down (decreasing dT/dz with depth) and concave up (increasing dT/dz) sediment thermal gradients can be explained by respective average temperature decreases and increases of 0.1-0.2 K amplitude occurring 28-35 days before the measurements. Thermal gradients throughout the entire region are strongly influenced by oceanographic phenomena and locally by the presence of subsurface diapiric structures, while sediment thickness variations and lateral differences in sedimentation rate and sediment lithology appear to exercise relatively little control over thermal regimes. Mean reduced heat flow in the study area is estimated at 49 mW m-2 by decompacting and back stripping the 5-8 km of sediment deposited on the margin since the formation of the underlying oceanic crust. This value agrees with previous measurements made on younger crust in the Blake Ridge area but is significantly higher than the reduced heat flow value in a similar passive margin setting at the Baltimore Canyon Trough. We use the calculated average thermal gradient value and an assumption of constant conductivity to estimate temperatures of 19.5C to 24.5C at the bottom-simulating reflector (BSR) on the Blake Ridge slope.

Ruppel, C.; von Herzen, R. P.; Bonneville, A.

1995-10-01

302

Thermophysical properties of granular-fibrous material on the temperature interval from 175 to 450 K  

SciTech Connect

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.

Nurmukhamedov, K.S.; Salimov, Z.S.; Nigmadzhanov, S.K. [and others

1992-06-01

303

D175 Discriminates Between NADH and NADPH in the Coenzyme Binding Site of Lactobacillus delbrueckii subsp. Bulgaricus D-Lactate Dehydrogenase  

Microsoft Academic Search

The NAD-dependent D-(-)-lactate dehydrogenase (D-LDH) from Lactobacillus delbrueckii subsp. bulgaricus (in short, L. bulgaricus) has been modified at position 175 by site-directed mutagenesis, changing a conserved aspartate residue into an alanine. The D175A mutant enzyme displays a 40-fold shift in coenzyme preference from NADH to NADPH. This demonstrates that D175 truly belongs to the amino acid consensus GXGXXGX(17)D (where X

N. Bernard; K. Johnsen; J. J. Holbrook; J. Delcour

1995-01-01

304

Spectral Analysis of Gravity Wave Motions Using 3.175 MHZ Imaging Radar.  

NASA Astrophysics Data System (ADS)

Imaging radar measurements were made in Puerto Rico during the AIDA Act '89 campaign in March-May, 1989. Data were taken with the MAPSTAR imaging Doppler interferometer (IDI) radar. For this campaign the radar was tuned to 3.175 MHz and used the Arecibo Heating Facility's transmitters and transmitter antennas. IDI radar yields a three-dimensional Doppler image of the viewed volume (in this case, a cone 15 degrees about the zenith). The scattering volume is characterized as a collection of "scattering points," each parameterized by its radial velocity, its three-dimensional location, and its amplitudes and phases referenced to a pair of crossed dipoles. Using this characterization, gravity wave parameters and turbulence activity in the mesosphere for a 16-hour period were calculated by means of the following techniques: first, by calculating the power spectral density of the recovered-power variability as a function of time, which provides information about the temporal characteristics of the gravity wave; second, by calculating the spatial power spectral density of the recovered-power profile, vertical wavenumber of the propagating gravity wave is then estimated; third, by computing two -dimensional spectra of the recovered-power variability in the temporal-spatial domain; and fourth, by computing two-dimensional spectra of the recovered-power variability in the spatial-spatial (i.e., horizontal plane) domain. Times series analysis results indicate a monochromatic gravity wave motion with an apparent period of nearly eight hours in the 70-94 km altitude. In addition, the presence of a wide spectrum of short-period gravity waves, whose spectral power is comparable to the long-period waves, is also detected. Spatial series analysis results indicate the presence of 3.3 and 20 km vertical wavelength wave motions. Two-dimensional spatial series results manifest various small-scale structures. A very enhanced 15-km structure has been observed near the sporadic-E region, which may be attributed to a gravity wave phase motion. Spatial -temporal series results suggest and provide confirmation of separability of the wavenumber and frequency dependence of the gravity wave spectrum at sufficiently low frequencies. At high frequencies, however, separability appears to break down.

Ghafourian, Mohammad Ali

1990-01-01

305

1.05-microm mode-locked Ytterbium fiber laser stabilized with the pulse train from a 1.54-microm laser diode.  

PubMed

Using cross-phase modulation in an optical fiber, we synchronized the pulse train from a mode-locked ytterbium fiber laser operating at 1.05 microm to an external optical master signal. The optical master source based on a 1.54 microm distributed feedback (DFB) diode laser was driven by the clock signal and was used as a seed source. The amplified seed pulses are launched into the fiber cavity and synchronize the mode-locked pulses through cross-phase modulation. The master clock signal is electronically generated, benefiting from inherent stability and repeatability. Due to its simplicity, this technique provides an attractive alternative to the traditional scheme that uses an independent mode-locked laser as source of seed signal. Since the approach is flexible and generally applicable, we expect this stabilization method to have a good potential for use in metrology and optical communications. PMID:19484084

Rusu, Matei; Herda, Robert; Okhotnikov, Oleg

2004-10-18

306

4 ?J, 3 ns phase-modulated laser pulse from ytterbium-doped polarization-maintaining large-mode-area fiber amplifier  

NASA Astrophysics Data System (ADS)

In the current inertial confinement fusion laser drivers, integrated fiber front-end is widely applied to generate the phase-modulated, linearly polarized laser pulses with an output energy of several nano-joules. In this contribution, we design an amplifier with polarization-maintaining optical components. The amplification of the phase-modulated 3 ns, 0.24 nm pulse is experimentally demonstrated in the ytterbium-doped large-mode-area (11 ?m-diameter) fiber amplifier. The pulse energy is amplified to around 4 ?J which is free of pulse distortion and stimulated Brillouin scattering. The modulation degree after optimal compensation of waveplates is less than 6%. The output mode field is diffraction-limited.

Huang, Z. H.; Deng, Y.; Xu, D. P.; Wang, J.; Lin, H.; Zhang, R.; Tian, X. C.

2012-07-01

307

Collision-induced photon echo at the transition 0{r_reversible}1 in ytterbium vapor: Direct proof of depolarizing collision anisotropy  

SciTech Connect

A collision-induced photon echo arising at the transition 0{r_reversible}1 of ytterbium in the presence of heavy atomic buffer is investigated. Collision-induced echo signal appears in the case of mutually orthogonal linear polarizations of exciting pulses and it is absent without buffer. Collision-induced echo power grows with buffer pressure up to the maximum value and decays exponentially at further buffer pressure growth. Collision-induced echo power is essentially less than that of the ordinary echo generated by pulses with parallel polarizations in the same mixture, and its polarization is linear with the polarization vector directed along that of the first exciting pulse. All the properties of collision-induced photon echo are explained on the basis of collision relaxation dependence on the direction of active atom velocity.

Rubtsova, N. N.; Gol'dort, V. G.; Ishchenko, V. N.; Khvorostov, E. B.; Kochubei, S. A.; Reshetov, V. A.; Yevseyev, I. V. [A. V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, 13 Academician Lavrentyev Avenue, Novosibirsk 630090 (Russian Federation); Togliatti State University, 14 Belorusskaya Street, Togliatti 445667 (Russian Federation); Moscow Physical Engineering State Institute, 31 Kashirskoye Shosse, Moscow 115409 (Russian Federation)

2011-09-15

308

Spectroscopy of f-f radiative transitions of Y b(+) ions in ytterbium doped orthophosphates at ambient and high hydrostatic pressures.  

PubMed

Studies of absorption and luminescence spectra, and luminescence decay times of the intrashell f-f transitions of Y b(+) 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(+) emission properties on the local symmetry of the site occupied by the ytterbium dopant. PMID:21393749

Kaminska, A; Duzynska, A; Suchocki, A; Bettinelli, M

2010-05-20

309

Magnetic, thermodynamic, and electrical transport properties of ternary equiatomic ytterbium compounds YbTM (T=transition metal, M=Sn and Bi)  

NASA Astrophysics Data System (ADS)

Physical behavior of several YbTM intermetallics has been studied by means of x-ray powder diffraction, magnetization, dc magnetic susceptibility, heat capacity, and electrical resistivity measurements. The compounds YbTBi with T=Cu, Ag, Au and YbTSn with T=Ag, Au, Zn were shown to be nonmagnetic due to the presence of divalent ytterbium ions. The bismuthide YbPdBi as well as the stannides YbRhSn and YbPtSn were found to exhibit localized magnetism of almost trivalent Yb ions. The electrical behavior of these three phases is characteristic of dense Kondo systems, and their low-temperature specific heat data indicate a possible heavy fermion ground state.

Kaczorowski, D.; Leithe-Jasper, A.; Rogl, P.; Flandorfer, H.; Cichorek, T.; Pietri, R.; Andraka, B.

1999-07-01

310

Magnetic transition and large reversible magnetocaloric effect in EuCu1.75P2 compound  

NASA Astrophysics Data System (ADS)

The magnetocaloric effect (MCE) in EuCu1.75P2 compound is studied by the magnetization and heat capacity measurements. Magnetization and modified Arrott plots indicate that the compound undergoes a second-order phase transition at TC ~ 51 K. A large reversible MCE is observed around TC. The values of maximum magnetic entropy change (-?SmaxM) reach 5.6 Jkg-1K-1 and 13.3 Jkg-1K-1 for the field change of 2 T and 7 T, respectively, with no obvious hysteresis loss in the vicinity of Curie temperature. The corresponding maximum adiabatic temperature changes (?Tmaxad) are evaluated to be 2.1 K and 5.0 K. The magnetic transition and the origin of large MCE in EuCu1.75P2 are also discussed.

Huo, De-Xuan; Liao, Luo-Bing; Li, Ling-Wei; Li, Miao; Qian, Zheng-Hong

2013-02-01

311

Structural, luminescence, and NMR studies of the reversible binding of acetate, lactate, citrate, and selected amino acids to chiral diaqua ytterbium, gadolinium, and europium complexes.  

PubMed

The nature of the ternary complexes formed in aqueous media at ambient pH on reversible binding of acetate, lactate, citrate, and selected amino acids and peptides to chiral diaqua europium, gadolinium, or ytterbium cationic complexes has been examined. Crystal structures of the chelated ytterbium acetate and lactate complexes have been defined in which the carboxylate oxygen occupies an "equatorial" site in the nine-coordinate adduct. The zwitterionic adduct of the citrate anion with [EuL1] was similar to the chelated lactate structure, with a 5-ring chelate involving the apical 3-hydroxy group and the alpha-carboxylate. Analysis of Eu and Yb emission CD spectra and lifetimes (H2O and D2O) for each ternary complex, in conjunction with 1H NMR analyses of Eu/Yb systems and 17O NMR and relaxometric studies of the Gd analogues, suggests that carbonate, oxalate, and malonate each form a chelated (q = 0) square-antiprismatic complex in which the dipolar NMR paramagnetic shift (Yb, Eu) and the emission circular polarization (gem for Eu) are primarily determined by the polarizability of the axial ligand. The ternary complexes with hydrogen phosphate, with fluoride, and with Phe, His, and Ser at pH 6 are suggested to be monoaqua systems with Eu/Gd with an apical bound water molecule. However, for the ternary complexes of simple amino acids with [YbL1]3+, the enhanced charge demand favors a chelate structure with the amine N in an apical position. Crystal structures of the Gly and Ser adducts confirm this. In peptides and proteins (e.g. albumin) containing Glu or Asp residues, the more basic side chain carboxylate may chelate to the Ln ion, displacing both waters. PMID:12392417

Dickins, Rachel S; Aime, Silvio; Batsanov, Andrei S; Beeby, Andrew; Botta, Mauro; Bruce, James I; Howard, Judith A K; Love, Christine S; Parker, David; Peacock, Robert D; Puschmann, Horst

2002-10-30

312

Tribocorrosion behavior of Ni17.5Si29.3Cr alloy in sulfuric acid solution  

Microsoft Academic Search

The tribocorrosion property of a Ni-17.5Si-29.3Cr alloy against a Si3N4 ball was studied in comparison with AISI321 stainless steel using a ball-on-disk reciprocating tribotester in 1M sulfuric acid (H2SO4) solution. The effects of load and sliding speed on the tribocorrosion properties of the alloy were investigated. The results indicated that the wear rate of the alloy increased while the friction

Qinling Bi; Weimin Liu; Jiqiang Ma; Jun Yang; Yuping Pu; Qunji Xue

2009-01-01

313

Ser170 controls the conformational multiplicity of the loop 166 175 in prion proteins: implication for conversion and species barrier  

Microsoft Academic Search

The self-perpetuating conversion of cel- lular prion proteins (PrPC) into an aggregated -sheet rich conformation is associated with transmissible spon- giform encephalopathies (TSE). The loop 166 -175 (L1) in PrPC, which displays sequence and structural variation among species, has been suggested to play a role in species barrier, in particular against transmis- sion of TSE from cervids to domestic and

Alemayehu A. Gorfe; Amedeo Caflisch

2007-01-01

314

Crystal structure of a ribonuclease from the seeds of bitter gourd ( Momordica charantia) at 1.75 resolution  

Microsoft Academic Search

The ribonuclease MC1 (RNase MC1) from seeds of bitter gourd (Momordica charantia) consists of 190 amino acid residues with four disulfide bridges and belongs to the RNase T2 family, including fungal RNases typified by RNase Rh from Rhizopus niveus and RNase T2 from Aspergillus oryzae. The crystal structure of RNase MC1 has been determined at 1.75 resolution with an

Atsushi Nakagawa; Isao Tanaka; Ritsu Sakai; Takashi Nakashima; Gunki Funatsu; Makoto Kimura

1999-01-01

315

The flexibility of two tropomyosin mutants, D175N and E180G, that cause hypertrophic cardiomyopathy.  

PubMed

Point mutations targeting muscle thin filament proteins are the cause of a number of cardiomyopathies. In many cases, biological effects of the mutations are well-documented, whereas their structural and mechanical impact on filament assembly and regulatory function is lacking. In order to elucidate molecular defects leading to cardiac dysfunction, we have examined the structural mechanics of two tropomyosin mutants, E180G and D175N, which are associated with hypertrophic cardiomyopathy (HCM). Tropomyosin is an ?-helical coiled-coil dimer which polymerizes end-to-end to create an elongated superhelix that wraps around F-actin filaments of muscle and non-muscle cells, thus modulating the binding of other actin-binding proteins. Here, we study how flexibility changes in the E180G and D175N mutants might affect tropomyosin binding and regulatory motion on F-actin. Electron microscopy and Molecular Dynamics simulations show that E180G and D175N mutations cause an increase in bending flexibility of tropomyosin both locally and globally. This excess flexibility is likely to increase accessibility of the myosin-binding sites on F-actin, thus destabilizing the low-Ca(2+) relaxed-state of cardiac muscle. The resulting imbalance in the on-off switching mechanism of the mutants will shift the regulatory equilibrium towards Ca(2+)-activation of cardiac muscle, as is observed in affected muscle, accompanied by enhanced systolic activity, diastolic dysfunction, and cardiac compensations associated with HCM and heart failure. PMID:22789852

Li, Xiaochuan Edward; Suphamungmee, Worawit; Janco, Miro; Geeves, Michael A; Marston, Steven B; Fischer, Stefan; Lehman, William

2012-07-09

316

Inhibition by a new bisphosphonate (YM175) of bone resorption induced by the MBT-2 tumour of mice.  

PubMed Central

A new bisphosphonate, disodium dihydrogen (cycloheptylamino) methylene bisphosphonate monohydrate (YM175), was compared with 3-amino-1-hydroxypropylidene-1, 1-bisphosphonate (AHPrBP) and 1-hydroxyethylidene-1,1-bisphosphonate (HEBP) in terms of its effect on tumour induced osteolysis using a bladder tumour in mice (MBT-2). The method consisted of inoculating tumour cells subcutaneously (SC) over the calvaria in mice, resulting in a local tumour causing fragmentation of the bone. The compounds were active not only when administered preventively before establishment of bone resorption, but also in an inhibitory fashion once the variables were already under the influence of the tumour. This osteolysis was evaluated by measuring the increased area of bone resorption in reduced opacity to radiograph and histology. The results showed the following sequence of potency: YM175 > AHPrBP = HEBP. This inhibition was obtained with no apparent effect on the growth of the MBT-2 tumour. YM175 appears to be an interesting new bisphosphonate with possible clinical application. Images Figure 1

Nemoto, R.; Nishijima, Y.; Uchida, K.; Koiso, K.

1993-01-01

317

Power Modulation Investigation for High Temperature (175-200 degrees Celcius) Automotive Application  

SciTech Connect

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

McCluskey, F. P.

2007-04-30

318

Fission time scale from prescission neutron, proton, and {alpha} particle multiplicities in {sup 28}Si+{sup 175}Lu  

SciTech Connect

Prescission neutron, proton, and {alpha}-particle multiplicities for the reaction {sup 28}Si+{sup 175}Lu at 159 MeV were measured simultaneously. The multiplicity data were analyzed using deformation dependent particle transmission coefficients, binding energies, and level densities to extract fission time scales and the mean deformation of the saddle-to-scission emitter. The neutron and charged particle data could be explained consistently, a better fit being obtained by considering the emission of neutrons to be favored toward larger deformation as compared to charged particles. The total fission time scale is deduced as 36-41x10{sup -21}s.

Ramachandran, K.; Chatterjee, A.; Navin, A.; Mahata, K.; Shrivastava, A.; Tripathi, V.; Kailas, S.; Saxena, A.; Thomas, R.G.; Kumar, Suresh; Sahu, P.K. [Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India); Nanal, V.; Pillay, R.G. [Department of Nuclear and Atomic Physics, T.I.F.R, Colaba, Mumbai 400 005 (India)

2006-06-15

319

Ferromagnetic microstructures in the ferromagnetic metallic phase of La0.825Sr0.175MnO3  

NASA Astrophysics Data System (ADS)

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.

Koyama, T.; Togawa, Y.; Takenaka, K.; Mori, S.

2012-04-01

320

Statistical properties of secondary ?-transitions in the 175,176 Lu(n res , ?) 176,177 Lu reactions  

Microsoft Academic Search

The175,176Lu(n,?)176,177Lu reactions have been studied at the JINR Fast Pulsed Reactor IBR-30. Using a time-of-flight technique,?-ray spectra on isolated resonances have been measured. From analysis of secondary?-transition intensities resonance spins have been deduced for both reactions studied. Statistical treatment of the secondary?-ray intensities has shown, that population of low-lying levels in the product nuclei176,177Lu fluctuate from resonance to resonance stronger

L. Aldea; F. Be?v?; Huynh Thuong Hiep; S. Pospil; S. A. Telezhnikov

1978-01-01

321

Investigations of the g{sub K}-factors in the {sup 175,177,179}Hf Isotopes  

SciTech Connect

In this paper the intrinsic g{sub K} and effective spin g{sub s} factors of the odd-mass {sup 175-179}Hf isotopes have been investigated within the Tamm-Dancoff approximation by using the realistic Saxon-Woods potential. The theoretically calculated g{sub K} and g{sub s}{sup eff} values are compared with experimental data. The comparison of the measured and calculated values of the effective g{sub s} factor shows that the spin polarization explains quite well the observed reduction of g{sub s} from its free-nucleon value.

Yakut, Hakan; Kuliev, Ali [Sakarya University, Department of physics, Sakarya (Turkey); Guliyev, Ekber [National Academy of Sciences, Institute of Physics, Baku (Azerbaijan)

2008-11-11

322

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

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}.

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

323

Electronic structure of vacancy-ordered iron-selenide K0.5Fe1.75Se2  

NASA Astrophysics Data System (ADS)

The electronic structure of the vacancy-ordered K0.5Fe1.75Se2 iron-selenide compound (278 phase) is studied using the first-principles density functional method. The ground state of the 278 phase is stripelike antiferromagnetic, and its bare electron susceptibility shows a large peak around (?,?) in the folded Brillouin zone. Near the Fermi level, the density of states is dominated by the Fe-3d orbitals, and both electronlike and holelike Fermi surfaces appear in the Brillouin zone. An unfolded band structure shows limited similarities to a hole-doped 122 phase. With 0.1e electron doping, the susceptibility peak is quickly suppressed and broadened, while the two dimensionality of the electronlike Fermi surfaces is greatly enhanced, resulting in a better nesting behavior. Our study should be relevant to the recently reported superconducting phase K0.5+xFe1.75+ySe2 with both x and y being very tiny.

Cao, Chao; Zhang, Fuchun

2013-04-01

324

Phosphorylation of CDK9 at Ser175 enhances HIV transcription and is a marker of activated P-TEFb in CD4(+) T lymphocytes.  

PubMed

The HIV transactivator protein, Tat, enhances HIV transcription by recruiting P-TEFb from the inactive 7SK snRNP complex and directing it to proviral elongation complexes. To test the hypothesis that T-cell receptor (TCR) signaling induces critical post-translational modifications leading to enhanced interactions between P-TEFb and Tat, we employed affinity purification-tandem mass spectrometry to analyze P-TEFb. TCR or phorbal ester (PMA) signaling strongly induced phosphorylation of the CDK9 kinase at Ser175. Molecular modeling studies based on the Tat/P-TEFb X-ray structure suggested that pSer175 strengthens the intermolecular interactions between CDK9 and Tat. Mutations in Ser175 confirm that this residue could mediate critical interactions with Tat and with the bromodomain protein BRD4. The S175A mutation reduced CDK9 interactions with Tat by an average of 1.7-fold, but also completely blocked CDK9 association with BRD4. The phosphomimetic S175D mutation modestly enhanced Tat association with CDK9 while causing a 2-fold disruption in BRD4 association with CDK9. Since BRD4 is unable to compete for binding to CDK9 carrying S175A, expression of CDK9 carrying the S175A mutation in latently infected cells resulted in a robust Tat-dependent reactivation of the provirus. Similarly, the stable knockdown of BRD4 led to a strong enhancement of proviral expression. Immunoprecipitation experiments show that CDK9 phosphorylated at Ser175 is excluded from the 7SK RNP complex. Immunofluorescence and flow cytometry studies carried out using a phospho-Ser175-specific antibody demonstrated that Ser175 phosphorylation occurs during TCR activation of primary resting memory CD4+ T cells together with upregulation of the Cyclin T1 regulatory subunit of P-TEFb, and Thr186 phosphorylation of CDK9. We conclude that the phosphorylation of CDK9 at Ser175 plays a critical role in altering the competitive binding of Tat and BRD4 to P-TEFb and provides an informative molecular marker for the identification of the transcriptionally active form of P-TEFb. PMID:23658523

Mbonye, Uri R; Gokulrangan, Giridharan; Datt, Manish; Dobrowolski, Curtis; Cooper, Maxwell; Chance, Mark R; Karn, Jonathan

2013-05-02

325

Termination of transcription of ribosomal RNA genes of mung bean occurs within a 175 bp repetitive element of the spacer region  

Microsoft Academic Search

In mung bean (Vigna radiata, formerly Phaseolus aureus) one length heterogeneity in the intergenic spacer (IGS) of the ribosomal DNA (rDNA) is due to a variable number of 175-bp subrepeats. This spacer region downstream of the 25S rRNA coding region was characterized by seuquencing the 2.4 kb EcoRI\\/HindIII fragment of a 10.5 kb mung bean rDNA repeat. Within the 175-bp

Katrin Schiebel; Georg von Waldburg; Jutta Gerstner; Vera Hemleben

1989-01-01

326

MAGE-A3 161175 contains an HLA-DR?4 restricted natural epitope poorly formed through indirect presentation by dendritic cells  

Microsoft Academic Search

We report here that HLA-DR?4*01 restricted MAGE-A3161175 specific CD4+ T cells from a healthy donor recognize a naturally processed epitope formed through the exogenous but not the endogenous\\u000a pathway. However, the intensity of recognition of the native epitope by MAGE-A3161175 specific CD4+ T cells strongly depends on the antigen presenting cells and the amount of protein available for processing. EBV-transformed

Jill Marturano; Renato Longhi; Giulia Casorati; Maria Pia Protti

2008-01-01

327

Fatigue crack growth of {beta}-21S titanium alloy under constant amplitude and miniTWIST flight spectra at 25 C and 175 C  

SciTech Connect

{beta}-21S titanium alloy sheet fatigue crack growth behavior was investigated at 25 C and 175 C under constant amplitude (R = 0.1 and 0.5) and miniTWIST flight spectra. Based upon nominal {Delta}K values, constant amplitude fatigue crack growth behavior at 175 C was either similar to (R = 0.1), or slightly better than (R = 0.5) 25 C. With crack closure taken into account, the fatigue crack growth curves at 175 C, plotted as a function of K{sub eff}, were shifted to the left of the fatigue crack growth curves at 25 C at near threshold values. Under flight spectra conditions, fatigue crack growth life at 175 C was 40 to 90% longer than at 25 C. Flight spectra life calculations using NASA/FLAGRO based upon constant amplitude fatigue crack growth data, were primarily conservative but in good agreement with experimental data. Fatigue crack growth was transgranular with crystalline facets and striations that were evident at higher constant amplitude fatigue crack growth rates and with the miniTWIST spectra. Striations were observed to a limited extent at threshold and near threshold conditions at 25 C, but not at 175 C. Based upon desirable constant and variable amplitude fatigue crack growth and fatigue/fracture crack morphology, this {beta}-21S sheet alloy appears to be an acceptable material for damage tolerant aerospace situations between 25 C and 175 C.

Stephens, R.R.; Albertson, T.P. [Univ. of Idaho, Moscow, ID (United States). Mechanical Engineering; Stephens, R.I.; Veit, A.L. [Univ. of Iowa, Iowa City, IA (United States). Mechanical Engineering

1997-10-01

328

Comprehensive Behavioral and Molecular Characterization of a New Knock-In Mouse Model of Huntington's Disease: zQ175  

PubMed Central

Huntingtons disease (HD) is an autosomal dominant neurodegenerative disorder characterized by motor, cognitive and psychiatric manifestations. Since the mutation responsible for the disease was identified as an unstable expansion of CAG repeats in the gene encoding the huntingtin protein in 1993, numerous mouse models of HD have been generated to study disease pathogenesis and evaluate potential therapeutic approaches. Of these, knock-in models best mimic the human condition from a genetic perspective since they express the mutation in the appropriate genetic and protein context. Behaviorally, however, while some abnormal phenotypes have been detected in knock-in mouse models, a model with an earlier and more robust phenotype than the existing models is required. We describe here for the first time a new mouse line, the zQ175 knock-in mouse, derived from a spontaneous expansion of the CAG copy number in our CAG 140 knock-in colony [1]. Given the inverse relationship typically observed between age of HD onset and length of CAG repeat, since this new mouse line carries a significantly higher CAG repeat length it was expected to be more significantly impaired than the parent line. Using a battery of behavioral tests we evaluated both heterozygous and homozygous zQ175 mice. Homozygous mice showed motor and grip strength abnormalities with an early onset (8 and 4 weeks of age, respectively), which were followed by deficits in rotarod and climbing activity at 30 weeks of age and by cognitive deficits at around 1 year of age. Of particular interest for translational work, we also found clear behavioral deficits in heterozygous mice from around 4.5 months of age, especially in the dark phase of the diurnal cycle. Decreased body weight was observed in both heterozygotes and homozygotes, along with significantly reduced survival in the homozygotes. In addition, we detected an early and significant decrease of striatal gene markers from 12 weeks of age. These data suggest that the zQ175 knock-in line could be a suitable model for the evaluation of therapeutic approaches and early events in the pathogenesis of HD.

Menalled, Liliana B.; Kudwa, Andrea E.; Miller, Sam; Fitzpatrick, Jon; Watson-Johnson, Judy; Keating, Nicole; Ruiz, Melinda; Mushlin, Richard; Alosio, William; McConnell, Kristi; Connor, David; Murphy, Carol; Oakeshott, Steve; Kwan, Mei; Beltran, Jose; Ghavami, Afshin; Brunner, Dani; Park, Larry C.; Ramboz, Sylvie; Howland, David

2012-01-01

329

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

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.

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

330

Up-conversion luminescence analysis in ytterbium-sensitized erbium-doped oxide-halide tellurite and germanate-niobic-lead glasses.  

PubMed

Ytterbium-sensitized erbium-doped oxide-halide tellurite and germanate-niobic-lead glasses have been synthesized by conventional melting method. Intense green and red emissions centered at 525, 546 and 657 nm, corresponding to the transitions 2H11/2-->4I15/2, 4S3/2-->4I15/2 and 4F9/2-->4I15/2, respectively, were simultaneously observed at room temperature in these glasses. The quadratic dependence of the 525, 546 and 657 nm emissions on excitation power indicates that a two-photon absorption process occurs. Tellurite glass showed a weaker up-conversion emission than germanate-niobic-lead glass, which is inconsistent with the prediction from the difference of maximum phonon energy between tellurite and germanate-niobic-lead glasses. In this paper, Raman spectroscopy was employed to investigate the origin of the difference in up-conversion luminescence in the two glasses. Compared with phonon side-band spectroscopy, Raman spectroscopy extracts more information including both phonon energy and phonon density. Our results reveal that the phonon density and the maximum phonon energy of host glasses are both important factors in determining the up-conversion efficiency. PMID:15950534

Sun, Hongtao; Yu, Chunlei; Zhou, Gang; Duan, Zhongchao; Liao, Meisong; Zhang, Junjie; Hu, Lili; Jiang, Zhonghong

2005-06-13

331

Versatile ytterbium ion trap experiment for operation of scalable ion-trap chips with motional heating and transition-frequency measurements  

SciTech Connect

We present the design and operation of an ytterbium ion trap experiment with a setup offering versatile optical access and 90 electrical interconnects that can host advanced surface and multilayer ion trap chips mounted on chip carriers. We operate a macroscopic ion trap compatible with this chip carrier design and characterize its performance, demonstrating secular frequencies >1 MHz, and trap and cool nearly all of the stable isotopes, including {sup 171}Yb{sup +} ions, as well as ion crystals. For this particular trap we measure the motional heating rate and observe an {proportional_to}1/{omega}{sup 2} behavior for different secular frequencies {omega}. We also determine a spectral noise density S{sub E}(1 MHz)=3.6(9)x10{sup -11} V{sup 2} m{sup -2} Hz{sup -1} at an ion electrode spacing of 310(10) {mu}m. We describe the experimental setup for trapping and cooling Yb{sup +} ions and provide frequency measurements of the {sup 2}S{sub 1/2{r_reversible}}{sup 2}P{sub 1/2} and {sup 2}D{sub 3/2{r_reversible}}{sup 3}D[3/2]{sub 1/2} transitions for the stable {sup 170}Yb{sup +}, {sup 171}Yb{sup +}, {sup 172}Yb{sup +}, {sup 174}Yb{sup +}, and {sup 176}Yb{sup +} isotopes which are more precise than previously published work.

McLoughlin, James J.; Nizamani, Altaf H.; Siverns, James D.; Sterling, Robin C.; Hughes, Marcus D.; Lekitsch, Bjoern; Stein, Bjoern; Weidt, Seb; Hensinger, Winfried K. [Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH (United Kingdom)

2011-01-15

332

Nanoscale phase separation of antiferromagnetic order and superconductivity in K0.75Fe1.75Se2  

PubMed Central

We report an in-plane optical spectroscopy study on the iron-selenide superconductor K0.75Fe1.75Se2. The measurement revealed the development of a sharp reflectance edge below Tc at frequency much smaller than the superconducting energy gap on a relatively incoherent electronic background, a phenomenon which was not seen in any other Fe-based superconductors so far investigated. Furthermore, the feature could be noticeably suppressed and shifted to lower frequency by a moderate magnetic field. Our analysis indicates that this edge structure arises from the development of a Josephson-coupling plasmon in the superconducting condensate. Together with the transmission electron microscopy analysis, our study yields compelling evidence for the presence of nanoscale phase separation between superconductivity and magnetism. The results also enable us to understand various seemingly controversial experimental data probed from different techniques.

Yuan, R. H.; Dong, T.; Song, Y. J.; Zheng, P.; Chen, G. F.; Hu, J. P.; Li, J. Q.; Wang, N. L.

2012-01-01

333

Structural recovery of self-irradiated natural and 238Pu-doped zircon in an acidic solution at 175 C  

NASA Astrophysics Data System (ADS)

We have investigated the aqueous stability of self-irradiated natural and synthetic 238Pu-doped zircon (4.7 wt% of 238Pu) in an acidic solution at 175 C. Both zircon samples have suffered a similar degree of self-irradiation damage, as given by their degree of amorphization. X-ray diffraction measurements revealed that during the hydrothermal treatment only the disordered crystalline remnants recovered in the natural zircon, whereas in the 238Pu-doped zircon the amorphous phase strongly recrystallized. Such a different alteration behavior of natural and Pu-doped zircon is discussed in terms of two fundamentally different alteration mechanisms. Our results demonstrate that further experimental studies with Pu-doped zircon are required before any reliable prediction about the long-term aqueous stability of an actinide waste form based on zircon can be made.

Geisler, Thorsten; Burakov, Boris; Yagovkina, Maria; Garbuzov, Vladimir; Zamoryanskaya, Maria; Zirlin, Vladimir; Nikolaeva, Larisa

2005-01-01

334

Structural phase transition below 250 K in superconducting K0.75Fe1.75Se2  

NASA Astrophysics Data System (ADS)

Vibrational properties of iron-chalcogenide superconductor K0.75Fe1.75Se2 with Tc 30 K have been measured by Raman and optical spectroscopies over the temperature range 3-300 K. The sample undergoes I4/m?I4 structural phase transition accompanied by loss of inversion symmetry at T1, below 250 K, observed as the appearance of new fully symmetric Raman mode at 165 cm-1. Small vibration mode anomalies are also observed at T2 160 K. From first-principles vibrational analysis of antiferromagnetic K0.8Fe1.6Se2 utilizing pseudopotentials all observed Raman and infrared modes have been assigned and the displacement patterns of the new Raman mode identified as involving predominantly the Se atoms.

Ignatov, A.; Kumar, A.; Lubik, P.; Yuan, R. H.; Guo, W. T.; Wang, N. L.; Rabe, K.; Blumberg, G.

2012-10-01

335

Measurement of the sheet resistance of resistive films on thin substrates from 120 to 175 GHz using dielectric waveguides  

NASA Astrophysics Data System (ADS)

A method is reported for the measurement of the sheet resistance, at microwave frequencies, of conducting films supported on thin dielectric substrates. The sheet resistance is found from measurements of the millimeter-wave power transmission through the film using a millimeter-wave source and power meter coupled through dielectric waveguides. The accuracy of this technique does not depend on the precise placement of the waveguide terminations with respect to the substrate, in contrast to methods using metallic waveguides or coils. This method is used to characterize the sheet resistance of semiconductor samples in the frequency range 120-175 GHz and the results are compared to the dc values obtained by conventional techniques. Sheet resistance values can be easily measured by this method in the range from 1 to 1000 ?.

Collier, R. J.; Hasko, D. G.

2002-02-01

336

Epitaxial growth of silicon and germanium on (100)-oriented crystalline substrates by RF PECVD at 175 C  

NASA Astrophysics Data System (ADS)

We report on the epitaxial growth of crystalline Si and Ge thin films by standard radio frequency plasma enhanced chemical vapor deposition at 175 C on (100)-oriented silicon substrates. We also demonstrate the epitaxial growth of silicon films on epitaxially grown germanium layers so that multilayer samples sustaining epitaxy could be produced. We used spectroscopic ellipsometry, Raman spectroscopy, transmission electron microscopy and X-ray diffraction to characterize the structure of the films (amorphous, crystalline). These techniques were found to provide consistent results and provided information on the crystallinity and constraints in such lattice-mismatched structures. These results open the way to multiple quantum-well structures, which have been so far limited to few techniques such as Molecular Beam Epitaxy or MetalOrganic Chemical Vapor Deposition.

Labrune, M.; Bril, X.; Patriarche, G.; Largeau, L.; Mauguin, O.; Cabarrocas, P. Roca i.

2012-11-01

337

A 63 element 1.75 dimensional ultrasound phased array for the treatment of benign prostatic hyperplasia  

PubMed Central

Background Prostate cancer and benign prostatic hyperplasia are very common diseases in older American men, thus having a reliable treatment modality for both diseases is of great importance. The currently used treating options, mainly surgical ones, have numerous complications, which include the many side effects that accompany such procedures, besides the invasive nature of such techniques. Focused ultrasound is a relatively new treating modality that is showing promising results in treating prostate cancer and benign prostatic hyperplasia. Thus this technique is gaining more attention in the past decade as a non-invasive method to treat both diseases. Methods In this paper, the design, construction and evaluation of a 1.75 dimensional ultrasound phased array to be used for treating prostate cancer and benign prostatic hyperplasia is presented. With this array, the position of the focus can be controlled by changing the electrical power and phase to the individual elements for electronically focusing and steering in a three dimensional volume. The array was designed with a maximum steering angle of 13.5 in the transverse direction and a maximum depth of penetration of 11 cm, which allows the treatment of large prostates. The transducer piezoelectric ceramic, matching layers and cable impedance have been designed for maximum power transfer to tissue. Results To verify the capability of the transducer for focusing and steering, exposimetry was performed and the results correlated well with the calculated field. Ex vivo experiments using bovine tissue were performed with various lesion sizes and indicated the capability of the transducer to ablate tissue using short sonications. Conclusion A 1.75 dimensional array, that overcame the drawbacks associated with one-dimensional arrays, has been designed, built and successfully tested. Design issues, such as cable and ceramic capacitances, were taken into account when designing this array. The final prototype overcame also the problem of generating grating lobes at unwanted locations by tapering the array elements.

Saleh, Khaldon Y; Smith, Nadine Barrie

2005-01-01

338

Decreased Sensitivity to Changes in the Concentration of Metal Ions as the Basis for the Hyperactivity of DtxR(E175K)  

SciTech Connect

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.

D’ Aquino, J. Alejandro; Denninger, Andrew R.; Moulin, Aaron G.; D’ Aquino, Katharine E.; Ringe, Dagmar; (Harvard-Med); (Brandeis)

2010-01-12

339

The upstream sequence segment of the C-terminal cysteine-rich domain is required for microneme trafficking of Plasmodium falciparum erythrocyte binding antigen 175.  

PubMed

Erythrocyte invasion is a critical step for survival of Plasmodium parasites, the causative agents of malaria, in their host and recognition of the host cell receptors by Plasmodium erythrocyte-binding-like (EBL) proteins plays an important role. Although EBL subcellular localization was shown to be closely linked to parasite virulence in the rodent model of malaria, the trafficking of EBL to micronemes, the secretory organelle in the invasive parasite is not fully understood. In this study, we assessed the impact of the deletion and amino acid replacement of Plasmodium falciparum EBL (EBA-175) using transgenic P. falciparum lines expressing modified EBA-175. We found that, in addition to a signal peptide and a cysteine rich region (region 6) to the cytoplasmic tail, a previously unrecognized sequence segment in region 5 was required for correct microneme trafficking of EBA-175. Replacement of Arg or Phe residues in this segment altered microneme trafficking, suggesting that the sequence itself contained critical information. Based on these findings, we propose that the sequence segment in region 5 is also required for the recognition of EBA-175 by the trafficking machinery to direct this protein to the microneme. Our results provide key information to clarify an as yet unidentified EBA-175 trafficking mechanism. PMID:23268338

Sakura, Takaya; Yahata, Kazuhide; Kaneko, Osamu

2012-12-23

340

IDCS J1426.5+3508: COSMOLOGICAL IMPLICATIONS OF A MASSIVE, STRONG LENSING CLUSTER AT z = 1.75  

SciTech Connect

The galaxy cluster IDCS J1426.5+3508 at z = 1.75 is the most massive galaxy cluster yet discovered at z > 1.4 and the first cluster at this epoch for which the Sunyaev-Zel'Dovich effect has been observed. In this paper, we report on the discovery with Hubble Space Telescope imaging of a giant arc associated with this cluster. The curvature of the arc suggests that the lensing mass is nearly coincident with the brightest cluster galaxy, and the color is consistent with the arc being a star-forming galaxy. We compare the constraint on M{sub 200} based upon strong lensing with Sunyaev-Zel'Dovich results, finding that the two are consistent if the redshift of the arc is z {approx}> 3. Finally, we explore the cosmological implications of this system, considering the likelihood of the existence of a strongly lensing galaxy cluster at this epoch in a {Lambda}CDM universe. While the existence of the cluster itself can potentially be accommodated if one considers the entire volume covered at this redshift by all current high-redshift cluster surveys, the existence of this strongly lensed galaxy greatly exacerbates the long-standing giant arc problem. For standard {Lambda}CDM structure formation and observed background field galaxy counts this lens system should not exist. Specifically, there should be no giant arcs in the entire sky as bright in F814W as the observed arc for clusters at z {>=} 1.75, and only {approx}0.3 as bright in F160W as the observed arc. If we relax the redshift constraint to consider all clusters at z {>=} 1.5, the expected number of giant arcs rises to {approx}15 in F160W, but the number of giant arcs of this brightness in F814W remains zero. These arc statistic results are independent of the mass of IDCS J1426.5+3508. We consider possible explanations for this discrepancy.

Gonzalez, Anthony H.; Fedeli, Cosimo; Mancone, Conor [Department of Astronomy, University of Florida, Gainesville, FL 32611-2055 (United States); Stanford, S. Adam; Zeimann, Greg [Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States); Brodwin, Mark [Department of Physics, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110 (United States); Dey, Arjun [NOAO, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Eisenhardt, Peter R. M.; Stern, Daniel [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)

2012-07-10

341

Asparagine 175 of connexin32 is a critical residue for docking and forming functional heterotypic gap junction channels with connexin26.  

PubMed

The gap junction channel is formed by proper docking of two hemichannels. Depending on the connexin(s) in the hemichannels, homotypic and heterotypic gap junction channels can be formed. Previous studies suggest that the extracellular loop 2 (E2) is an important molecular domain for heterotypic compatibility. Based on the crystal structure of the Cx26 gap junction channel and homology models of heterotypic channels, we analyzed docking selectivity for several hemichannel pairs and found that the hydrogen bonds between E2 domains are conserved in a group of heterotypically compatible hemichannels, including Cx26 and Cx32 hemichannels. According to our model analysis, Cx32N175Y mutant destroys three hydrogen bonds in the E2-E2 interactions due to steric hindrance at the heterotypic docking interface, which makes it unlikely to dock with the Cx26 hemichannel properly. Our experimental data showed that Cx26-red fluorescent protein (RFP) and Cx32-GFP were able to traffic to cell-cell interfaces forming gap junction plaques and functional channels in transfected HeLa/N2A cells. However, Cx32N175Y-GFP exhibited mostly intracellular distribution and was occasionally observed in cell-cell junctions. Double patch clamp analysis demonstrated that Cx32N175Y did not form functional homotypic channels, and dye uptake assay indicated that Cx32N175Y could form hemichannels on the cell surface similar to wild-type Cx32. When Cx32N175Y-GFP- and Cx26-RFP-transfected cells were co-cultured, no colocalization was found at the cell-cell junctions between Cx32N175Y-GFP- and Cx26-RFP-expressing cells; also, no functional Cx32N175Y-GFP/Cx26-RFP heterotypic channels were identified. Both our modeling and experimental data suggest that Asn(175) of Cx32 is a critical residue for heterotypic docking and functional gap junction channel formation between the Cx32 and Cx26 hemichannels. PMID:21478159

Nakagawa, So; Gong, Xiang-Qun; Maeda, Shoji; Dong, Yuhua; Misumi, Yuko; Tsukihara, Tomitake; Bai, Donglin

2011-04-08

342

Asparagine 175 of Connexin32 Is a Critical Residue for Docking and Forming Functional Heterotypic Gap Junction Channels with Connexin26*  

PubMed Central

The gap junction channel is formed by proper docking of two hemichannels. Depending on the connexin(s) in the hemichannels, homotypic and heterotypic gap junction channels can be formed. Previous studies suggest that the extracellular loop 2 (E2) is an important molecular domain for heterotypic compatibility. Based on the crystal structure of the Cx26 gap junction channel and homology models of heterotypic channels, we analyzed docking selectivity for several hemichannel pairs and found that the hydrogen bonds between E2 domains are conserved in a group of heterotypically compatible hemichannels, including Cx26 and Cx32 hemichannels. According to our model analysis, Cx32N175Y mutant destroys three hydrogen bonds in the E2-E2 interactions due to steric hindrance at the heterotypic docking interface, which makes it unlikely to dock with the Cx26 hemichannel properly. Our experimental data showed that Cx26-red fluorescent protein (RFP) and Cx32-GFP were able to traffic to cell-cell interfaces forming gap junction plaques and functional channels in transfected HeLa/N2A cells. However, Cx32N175Y-GFP exhibited mostly intracellular distribution and was occasionally observed in cell-cell junctions. Double patch clamp analysis demonstrated that Cx32N175Y did not form functional homotypic channels, and dye uptake assay indicated that Cx32N175Y could form hemichannels on the cell surface similar to wild-type Cx32. When Cx32N175Y-GFP- and Cx26-RFP-transfected cells were co-cultured, no colocalization was found at the cell-cell junctions between Cx32N175Y-GFP- and Cx26-RFP-expressing cells; also, no functional Cx32N175Y-GFP/Cx26-RFP heterotypic channels were identified. Both our modeling and experimental data suggest that Asn175 of Cx32 is a critical residue for heterotypic docking and functional gap junction channel formation between the Cx32 and Cx26 hemichannels.

Nakagawa, So; Gong, Xiang-Qun; Maeda, Shoji; Dong, Yuhua; Misumi, Yuko; Tsukihara, Tomitake; Bai, Donglin

2011-01-01

343

Evaluation of treatment outcome in 175 patients with Hodgkin lymphoma aged 60 years or over: the SHIELD study.  

PubMed

The SHIELD program for Hodgkin lymphoma in patients 60 years of age or older, prospectively evaluated clinical features and outcome in a large patient cohort (n = 175). The central element was a phase 2 study of VEPEMB chemotherapy (n = 103, median age 73 years) incorporating comorbidity assessment. A total of 72 other patients were treated off-study but registered prospectively and treated concurrently with: ABVD (n = 35); CLVPP (n = 19), or other (n = 18). Of VEPEMB patients, 31 had early-stage disease (stage 1A/2A) and received VEPEMB 3 times plus radiotherapy. Median follow-up was 36 months. Complete remission (CR) rate (intention-to-treat) was 74% and 3-year overall survival (OS) and progression-free survival (PFS) were 81% and 74%, respectively. A total of 72 patients had advanced-stage disease (stage 1B/2B/3 or 4) and received VEPEMB 6 times. CR rate was 61% with 3-year OS and PFS of 66% and 58%, respectively. Of patients achieving CR, 13% with early-stage and 5% with advanced-stage disease progressed. Overall treatment-related mortality was 7%. In patients treated with curative intent with VEPEMB, ABVD, and CLVPP (n = 157), CR linked to several factors in univariate analysis. In a Cox regression model only, obtaining CR remained significant for OS and CR plus comorbidity and age for PFS. RS-EBV status had no significant effect on outcome. PMID:22577177

Proctor, Stephen J; Wilkinson, Jennifer; Jones, Gail; Watson, Gillian C; Lucraft, Helen H; Mainou-Fowler, Tryfonia; Culligan, Dominic; Galloway, Michael J; Wood, Katrina M; McNally, Richard J Q; James, Peter W; Goodlad, John R

2012-05-10

344

HYDROGEN EFFECTS ON FRACTURE TOUGHNESS OF TYPE 316L STAINLESS STEEL FROM 175 K TO 425 K  

SciTech Connect

The effects of hydrogen on the fracture-toughness properties of Type 316L stainless steel from 175 K to 425 K were measured. Fracture-toughness samples were fabricated from Type 316L stainless steel forgings and hydrogen-charged with hydrogen at 34 MPa and 623 K for two weeks prior to testing. The effect of hydrogen on the J-Integral vs. crack extension behavior was measured at various temperatures by fracturing non-charged and hydrogen-charged samples in an environmental chamber. Hydrogen-charged steels had lower toughness values than non-charged ones, but still retained good toughness properties. The fracture-toughness values of hydrogen-charged samples tested near ambient temperature were about 70% of non-charged values. For hydrogen-charged samples tested at 225 K and 425 K, the fracture-toughness values were 50% of the non-charged values. In all cases, fracture occurred by microvoid nucleation and coalescence, although the hydrogen-charged samples had smaller and more closely spaced microvoids. The results suggest that hydrogen effects on toughness are greater at 225 K than they are at ambient temperature because of strain-induced martensite formation. At 425 K, the hydrogen effects on toughness are greater than they are at ambient temperature because of the higher mobility of hydrogen.

Morgan, M; Glenn Chapman, G

2009-05-04

345

The comparison of doses measured by radiochromic films and semiconductor detector in a 175MeV proton beam.  

PubMed

We wanted to verify the response of radiochromic films in a 175MeV clinical proton beam used at the Joint Institute for Nuclear Research in Dubna against doses measured using semiconductor detectors and compare the results with published data from other centres. Radiochromic films (RCFs) MD-55 and a Vidar VXR-16 scanner were used. The films were irradiated in an unmodulated proton beam and with a beam modulated with a bolus and a ridge filter. Obtained dose distributions were compared with dose distributions measured with a Si-semiconductor detector. For the unmodulated beam the difference between the RCF and the semiconductor detector was 12% in the Bragg peak top. For the modulated beam the difference inside the spread-out Bragg peak region was 4%. Observed deviations between doses measured with RCF and Si-detector outside the Bragg peak were caused by the inhomogeneity of radiochromic emulsion. In the Bragg peak region the RCF doses were lower than those measured by semiconductors. The results were in agreement with published data from other proton therapy centres. PMID:18694653

Mumot, Marta; Mytsin, Gennady V; Molokanov, Alexander G; Malicki, Julian

2008-08-10

346

Comparative in vivo efficiencies of hand-washing agents against hepatitis A virus (HM-175) and poliovirus type 1 (Sabin).  

PubMed

The abilities of 10 hygienic hand-washing agents and tap water (containing approximately 0.5 ppm of free chlorine) to eliminate strain HM-175 of hepatitis A virus (HAV) and poliovirus (PV) type 1 (Sabin) were compared by using finger pad and whole-hand protocols with three adult volunteers. A mixture of the two viruses was prepared in a 10% suspension of feces, and 10 microliters of the mixture was placed on each finger pad. The inoculum was allowed to dry for 20 min, and the contaminated area was exposed to a hand-washing agent for 10 s, rinsed in tap water, and dried with a paper towel. In the whole-hand protocol, the hands were contaminated with 0.5 ml of the virus mixture, exposed for 10 s to a hand-washing agent, washed, and dried as described above. Tryptose phosphate broth was used to elute any virus remaining on the finger pads or hands. One part of the eluate was assayed directly for PV with FRhK-4 cells, while the other part was first treated with a PV-neutralizing serum and then assayed for HAV with the same cell line. The results are reported as mean percentages of reduction in PFU compared with the amount of infectious virus detectable after initial drying.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:8250567

Mbithi, J N; Springthorpe, V S; Sattar, S A

1993-10-01

347

Fully Optimized Cu based process with dedicated cavity etch for 1.75?m and 1.45?m pixel pitch CMOS Image Sensors  

Microsoft Academic Search

An innovative process development for sub-2?m CMOS imager sensors is described, leading to tremendous improvements on main pixel parameters like conversion gain, saturation charge, sensitivity, dark current and noise, A full 3MP demonstrator with 1.75? pixel pitch and 1.45?m pixel pitch have been successfully designed, fabricated and characterized

M. Cohen; F. Roy; D. Herault; Y. Cazaux; A. Gandolfi; J. P. Reynard; C. Cowache; E. Bruno; T. Girault; J. Vaillant; F. Barbier; Y. Sanchez; N. Hotellier; O. LeBorgne; C. Augier; A. Inard; T. Jagueneau; C. Zinck; J. Michailos; E. Mazaleyrat

2006-01-01

348

Anisotropy of mobility ratio between electron and hole along different orientations in ReGe{sub x}Si{sub 1.75-x} thermoelectric single crystals  

SciTech Connect

It was recently found that ReSi{sub 1.75} based semiconductor single crystals can be of either p or n type with a fixed composition, just depending on their different crystal orientations. To investigate the mechanism of this interesting phenomenon, we grow ReGe{sub x}Si{sub 1.75-x} (x=0.02 and 0.04) single crystals with a floating zone method with radiation heating. The Seebeck coefficient and electric resistivity of these samples are measured along [100] and [001], respectively. The conduction mechanism is of p type along [100] and of n type along [001], like binary ReSi{sub 1.75}, in the temperature range 50 to 800 deg. C. The mobility ratio between electron and hole is calculated from the Seebeck coefficient data and it is highly anisotropic along two different orientations (about 0.4 to 0.6 along [100] while 4 to 5 along [001] direction), giving rise to the orientation-dependent conduction sign reversal phenomenon observed in ReSi{sub 1.75}.

Gu, J.-J. [State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030 (China); Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501 (Japan); Oh, M.-W.; Inui, H. [Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501 (Japan); Zhang, D. [State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030 (China)

2005-03-15

349

SCIATRAN 2.0 - A new radiative transfer model for geophysical applications in the 175 - 2400 nm spectral region.  

NASA Astrophysics Data System (ADS)

The SCIATRAN radiative transfer models (RTMs) are next generation RTMs based on the well-known GOMETRAN model which was originally developed to simulate solar radiation backscattered from the atmosphere and reflected from the Earth's surface in the spectral range 240--800 nm as measured by the Global Ozone Monitoring Experiment (GOME) in nadir viewing geometry. A successor RTM called SCIATRAN was extended to cover the spectral range 240--2380 nm comprising the 8 spectral channels of the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) instrument. SCIATRAN versions up to 1.2 utilize the pseudo-spherical approach, including refraction, appropriate for solar zenith angles up to about 92 and near-nadir viewing angles. A new generation of the SCIATRAN radiative transfer model (version 2.0) comprises all features of the latest SCIATRAN 1.2 RTM supporting additionally radiative transfer calculations in a spherical atmosphere. The program is written in FORTRAN 95 and suitable for parallel execution using the OMP-standard. The wavelength range covered by the radiative transfer model is extended to 175 nm including Schuman-Runge and Herzberg absorption bands. The SCIATRAN 2.0 model exhibits the following new capabilities : (i) modeling of the scattered solar radiation in limb viewing geometry as well as any kind of measurements of the scattered radiation within the atmosphere, (ii) corresponding quasi-analytical calculation of weighting functions of atmospheric parameters, (iii) airmass factor calculations for ground-based, space- and airborne measurements including off-axis geometry, (iv) accounting for photochemically active species, i.e., radiative transfer calculations can be performed using solar zenith angle dependent vertical distributions of atmospheric trace gases, (v) height resolved radiation fluxes, including actinic fluxes for photolysis rate calculations, (vi) inelastic rotational Raman scattering in any supported viewing geometry, (vii) new effective approximations for cloud treatment.

Rozanov, A.; Rozanov, V.; Buchwitz, M.; Kokhanovsky, A.; Burrows, J. P.

350

Inducibility of life-threatening ventricular arrhythmias is related to maximum left ventricular thickness and clinical markers of sudden cardiac death in patients with hypertrophic cardiomyopathy attributable to the Asp175Asn mutation in the ?-tropomyosin gene  

Microsoft Academic Search

We investigated inducibility of life-threatening arrhythmias with programmed ventricular stimulation (PVS) in relation to clinical markers of sudden cardiac death (SCD) in subjects with hypertrophic cardiomyopathy (HCM) attributable to the Asp175Asn mutation in the ?-tropomyosin gene (TPM1-Asp175Asn). PVS was performed with up to three extrastimuli and distribution of markers of SCD was evaluated in 21adult subjects with the TPM1-Asp175Asn. Sustained

A. Hedman; J. Hartikainen; E. Vanninen; T. Laitinen; P. Jskelinen; M. Laakso; K. Peuhkurinen; J. Kuusisto

2004-01-01

351

Small-scaled dynamics and radar scattering properties of the mesosphere observed at 3.175 MHz  

NASA Astrophysics Data System (ADS)

Remote sensing techniques are important in the study of the middle atmosphere (50 to 100 km), where direct, in situ measurements tend to be more limited in spatial and temporal coverage and at the same time more expensive. Active remote sensing by medium frequency (1.5-3.0 MHz) radar has made a significant contribution to our understanding of the dynamics and structure of the region and numerous techniques have been developed for collecting and interpreting MF radar backscatter from the middle atmosphere. Nevertheless, a significant amount of uncertainty in the interpretation of the radar data can be attributed to the fact that the nature of the scattering mechanisms and of the scattering structures is poorly understood. This work represents an attempt to understand the structures responsible for radar backscatter from the middle atmosphere at MF. Experimental verification of a fundamental assumption of one radar technique, Imaging Doppler Interferometry (IDI), provided the motivation for this study. IDI is based on the idea that a composite radar return can be decomposed, through spectral analysis, into an ensemble of individual signatures from spatially localized scattering centers. This assumption follows from a model of scattering structures, such as turbulent eddies, embedded in and adverted by a horizontal background wind. In order to test these hypotheses about the structure of the middle atmosphere and the MF backscattering process, a technique for determining the spatial locality of the portion of the scattered signal corresponding to a small portion of the frequency spectrum of the echo was developed. The essence of the technique is to form a beam with the radar's receiving array that is swept across the scatterer, producing an antenna pattern. Limits on the spatial extent of the scatterer can then be determined by comparing the pattern produced to a model of the receiving array. The technique was applied to mesospheric radar data recorded at a frequency of 3.175 MHz in Puerto Rico. The results cover a maximum height interval of roughly 60 to 110 km. (Upper and lower limits at any given time are imposed by the scattering properties of the atmosphere, which vary in time.) The middle atmosphere is seen to divide into several regimes. The most prominent of these are the region below 80 km, where spectral analysis does appear to locate individual scatterers with well-defined locations and the 80 to 90 km interval where the localized scatterer model appears less appropriate.

Parker, Scott Elmer

2001-11-01

352

Scintillation properties of Yb3+-doped YAlO3 in the temperature range from 4.2 to 175 K  

NASA Astrophysics Data System (ADS)

We measured the temperature dependence of the emission wavelength spectrum of YAP:Yb by irradiating with ?-rays from a 90Sr/90Y source in the temperature range from 4.2 to 175 K. The light yield of YAP:Yb was characterized using an avalanche photodiode in the detection of 662-keV ?-rays from a 137Cs source in the temperature range from 50 to 175 K. The light yield was found to increase with decreasing temperature and reached 3840 photons/MeV at a temperature of 50 K. By extrapolating the temperature dependence of the light yield using that of the integrated emission spectra, the experimental light yield was evaluated to be 4300 photons/MeV at a temperature of 4.2 K.

Yasumune, T.; Kurihara, M.; Maehata, K.; Ishibashi, K.; Yoshikawa, A.

2013-10-01

353

Hour-glass magnetic spectrum arising from a striped cluster spin-glass ground state in La1.75Sr0.25CoO4  

NASA Astrophysics Data System (ADS)

We report inelastic neutron scattering results that reveal an hour-glass magnetic excitation spectrum in La1.75Sr0.25CoO4. The magnetic spectrum is similar to that observed previously in La1.67Sr0.33CoO4, but the spectral features are broader. We show that the spectrum of La1.75Sr0.25CoO4 can be modelled by the spin dynamics of a system with a disordered cluster spin glass ground state. Bulk magnetization measurements are presented that support the proposed glassy ground state. The observations reiterate the importance of quasi-one-dimensional magnetic correlations and disorder for the hour-glass spectrum, and suggest that disordered spin and charge stripes exist at lower doping in La2?xSrxCoO4 than previously thought.

Gaw, S. M.; Andrade, E. C.; Vojta, M.; Frost, C. D.; Adroja, D. T.; Prabhakaran, D.; Boothroyd, A. T.

2013-10-01

354

Utilization of Chimeras between Human (HM175) and Simian (AGM27) Strains of Hepatitis A Virus To Study the Molecular Basis of Virulence  

Microsoft Academic Search

Chimeras between human (HM-175) and simian (AGM-27) strains of hepatitis A virus (HAV) were con- structed to evaluate the effect of the 2C gene of AGM-27 on HAV replication in cell culture and virulence in tamarins (Saguinus mystax) and chimpanzees (Pan troglodytes). Kinetic studies and radioimmunofocus assays demonstrated that replacement of the 2C gene of HAV\\/7, a cell culture-adapted strain

GOPA RAYCHAUDHURI; SUGANTHA GOVINDARAJAN; MAX SHAPIRO; ROBERT H. PURCELL; SUZANNE U. EMERSON

1998-01-01

355

Effect of oxygen on phase formation and thermal stability of slowly cooled Zr 65Al 7.5Cu 17.5Ni 10 metallic glass  

Microsoft Academic Search

The effect of small amounts of oxygen (0.280.6at.%) on the phase formation and the thermal stability of bulk samples of the Zr65Al7.5Cu17.5Ni10 alloy prepared by die casting into a copper mould has been studied by X-ray diffraction, microstructural characterization and differential scanning calorimetry. In contrast to rapidly quenched ribbons, the crystalline volume fraction in slowly cooled bulk samples increases with

A. Gebert; J. Eckert; L. Schultz

1998-01-01

356

Temperature evolution of the local atomic structure in oxygen isotope substituted Pr 0.525 La 0.175 Ca 0.3 MnO 3  

Microsoft Academic Search

The local atomic structure of two oxygen isotope substituted samples of Pr0.525La0.175Ca0.3MnO3 with 16O and 18O has been studied as a function of temperature using the pair-distribution function (PDF) obtained from pulsed neutron diffraction. The sample containing 16O undergoes an insulator-metal (IM) transition below 100 K while the sample substituted with 18O remains insulating at all temperatures. We find from

M. Gutmann; E. S. Boin; S. J. L. Billinge; N. A. Babushkina; L. M. Belova; A. R. Kaul; O. Yu. Gorbenko

2002-01-01

357

Characterization of Neurophysiological and Behavioral Changes, MRI Brain Volumetry and 1H MRS in zQ175 Knock-In Mouse Model of Huntington's Disease  

PubMed Central

Huntington's disease (HD) is an autosomal neurodegenerative disorder, characterized by severe behavioral, cognitive, and motor deficits. Since the discovery of the huntingtin gene (HTT) mutation that causes the disease, several mouse lines have been developed using different gene constructs of Htt. Recently, a new model, the zQ175 knock-in (KI) mouse, was developed (see description by Menalled et al, [1]) in an attempt to have the Htt gene in a context and causing a phenotype that more closely mimics HD in humans. Here we confirm the behavioral phenotypes reported by Menalled et al [1], and extend the characterization to include brain volumetry, striatal metabolite concentration, and early neurophysiological changes. The overall reproducibility of the behavioral phenotype across the two independent laboratories demonstrates the utility of this new model. Further, important features reminiscent of human HD pathology are observed in zQ175 mice: compared to wild-type neurons, electrophysiological recordings from acute brain slices reveal that medium spiny neurons from zQ175 mice display a progressive hyperexcitability; glutamatergic transmission in the striatum is severely attenuated; decreased striatal and cortical volumes from 3 and 4 months of age in homo- and heterozygous mice, respectively, with whole brain volumes only decreased in homozygotes. MR spectroscopy reveals decreased concentrations of N-acetylaspartate and increased concentrations of glutamine, taurine and creatine + phosphocreatine in the striatum of 12-month old homozygotes, the latter also measured in 12-month-old heterozygotes. Motor, behavioral, and cognitive deficits in homozygotes occur concurrently with the structural and metabolic changes observed. In sum, the zQ175 KI model has robust behavioral, electrophysiological, and histopathological features that may be valuable in both furthering our understanding of HD-like pathophyisology and the evaluation of potential therapeutic strategies to slow the progression of disease.

Heikkinen, Taneli; Lehtimaki, Kimmo; Vartiainen, Nina; Puolivali, Jukka; Hendricks, Susan J.; Glaser, Jack R.; Bradaia, Amyaouch; Wadel, Kristian; Touller, Chrystelle; Kontkanen, Outi; Yrjanheikki, Juha M.; Buisson, Bruno; Howland, David; Beaumont, Vahri; Munoz-Sanjuan, Ignacio; Park, Larry C.

2012-01-01

358

Reversed pyroxene phase equilibria in CaO-MgO-SiO 2 from 925 to 1,175 C at one atmosphere pressure  

Microsoft Academic Search

Experiments using V2O5 as a high-temperature solvent have produced compositional reversals defining the miscibility gap between enstatite and diopside on the join Mg2Si2O6-CaMgSi2O6 between 925 and 1,175 C at atmospheric pressure. These experiments locate an equilibrium near 1,000 C among diopside, protoenstatite, and orthoenstatite; they verify the stable coexistence of diopside and protoenstatite above 1,000 C and disprove the hypothesis

William D. Carlson

1986-01-01

359

Investigation of the Quasicrystalline State of the D-Al67.5Cu17.5Rh15 and IAl70Cu12Ru18 alloys  

Microsoft Academic Search

In the present study we report on the formation, characterization and magnetic susceptibility of two conventionally solidified quasicrystalline alloys with the nominal composition Al67.5Cu17.5Rh15 (decagonal phase) and Al70Cu12Ru18 (icosahedral phase). The characterization of the quasicrystalline state was examined by X-ray diffractometry (XRD), differential thermal analysis (DTA), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive X-ray microanalysis (EDXA). Magnetic

N. S. Athanasiou; J. C. Spirlet; S. Zwirner; S. Baskoutas

1998-01-01

360

AT-rich promoter elements of soybean heat shock gene Gmhsp 17.5E bind two distinct sets of nuclear proteins in vitro  

Microsoft Academic Search

A 33 bp double-stranded oligonucleotide homologous to two AT-rich sequences located upstream (-907 to -889 and -843 to -826) to the start of transcription of heat shock gene Gmhsp17.5E of soybean stimulated transcription when placed 5' to a truncated (-140) maize Adh1 promoter. The chimeric promoter was assayed in vivo utilizing anaerobically stressed sunflower tumors transformed by a pTi-based vector

Eva Czarnecka; John C. Ingersoll; William B. Gurley

1992-01-01

361

Measurement of thermal neutron cross-section and resonance integral for the 174Yb(n,gamma)175Yb reaction by the cadmium ratio method  

Microsoft Academic Search

The thermal-neutron cross-section and the resonance integral for the 174Yb(n,gamma)175Yb reaction were measured by the activation method using a 55Mn monitor as single comparator. Analytical grade MnO2 and Yb2O3 powder samples with and without a cylindrical 1 mm Cd shield box were irradiated in an isotropic neutron field obtained from three 241Am Be neutron sources. The gamma-ray spectra from the

Mustafa Karadag; Haluk Ycel

2008-01-01

362

Measurement of thermal neutron cross-section and resonance integral for the 174Yb(n,?) 175Yb reaction by the cadmium ratio method  

Microsoft Academic Search

The thermal-neutron cross-section and the resonance integral for the 174Yb(n,?)175Yb reaction were measured by the activation method using a 55Mn monitor as single comparator. Analytical grade MnO2 and Yb2O3 powder samples with and without a cylindrical 1mm Cd shield box were irradiated in an isotropic neutron field obtained from three 241AmBe neutron sources. The gamma-ray spectra from the activated samples

Mustafa Karadag; Haluk Ycel

2008-01-01

363

?-Tropomyosin with a D175N or E180G Mutation in Only One Chain Differs from Tropomyosin with Mutations in Both Chains  

PubMed Central

?-Tropomyosin (Tm) carrying hypertrophic cardiomyopathy mutation D175N or E180G was expressed in Escherichia coli. We have assembled dimers of two polypeptide chains in vitro that carry one (??*) or two (?*?*) copies of the mutation. We found that the presence of the mutation has little effect on dimer assembly, thereby predicting that individuals heterozygous for the Tm mutations are likely to express both ??* and ?*?* Tm. Depending on the expression level, the heterodimer may be the predominant form in individuals carrying the mutation. Thus, it is important to define differences in the properties of Tm molecules carrying one or two copies of the mutation. We examined the Tm homo- and heterodimer properties: actin affinity, thermal stability, calcium regulation of myosin subfragment 1 binding, and calcium regulation of myofibril force. We report that the properties of the heterodimer may be similar to those of the wild-type homodimer (actin affinity, thermal stability, D175N ??*), similar to those of the mutant homodimer (calcium sensitivity, D175N ??*), intermediate between the two (actin affinity, E180G ??*), or different from both (thermal stability, E180G ??*). Thus, the properties of the homodimer are not a completely reliable guide to the properties of the heterodimer.

2012-01-01

364

Degenerate Fermi Gases of Ytterbium  

SciTech Connect

Evaporative cooling was performed to cool fermionic {sup 173}Yb 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.

Fukuhara, Takeshi [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan); Takasu, Yosuke [Department of Electronic Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan); Kumakura, Mitsutaka [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan); CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012 (Japan); PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012 (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)

2007-01-19

365

Rotational damping in ytterbium nuclei.  

PubMed

We have made the first clear measurements of rotational damping widths in nuclei. In a mixture of three Yb nuclei, these widths are 300 +/- 60 keV between 1.2 and 1.5 MeV gamma-ray energy [approximately (37-57)Planck's constant]. Compound damping and motional narrowing are discussed in connection with these results. PMID:11955141

Stephens, F S; Deleplanque, M A; Lee, I Y; Ward, D; Fallon, P; Cromaz, M; Clark, R M; Diamond, R M; Macchiavelli, A O; Vetter, K

2002-03-20

366

Determination of the thermo-optic coefficient dn\\/ dT of ytterbium doped ceramics (Sc 2O 3, Y 2O 3, Lu 2O 3, YAG), crystals (YAG, CaF 2) and neodymium doped phosphate glass at cryogenic temperature  

Microsoft Academic Search

In this paper, we report the measurements of the thermal expansion coefficient and the thermo-optic coefficient dn\\/dT for the ytterbium doped cubic sesquioxides (Sc2O3, Y2O3, Lu2O3) at cryogenic temperature. These materials appear to have very interesting properties for setting up high average power laser chains useful for plasma physics and for inertial fusion energy drivers. Measurements have also been done

V. Cardinali; E. Marmois; B. Le Garrec; G. Bourdet

367

Altered expression of miR-17-5p in CD4+ lymphocytes of relapsing-remitting multiple sclerosis patients.  

PubMed

MicroRNA (miRNA) are a class of post-transcriptional regulators of gene expression targeting mRNA for translational repression and/or degradation. We analyzed the expression of 365 miRNA in lymphocytes in relapsing-remitting MS patients, and show the first evidence for distinct miRNA expression profiles in CD4(+), CD8(+) and B cells in MS when compared with those in healthy volunteers. MiR-17-5p, which is involved in autoimmunity, was up-regulated in CD4(+) cells from MS patients. This was correlated with alterations in the expression of potential target genes of miR-17-5p, i.e. phosphatase and tensin homology and phosphatidyl-inositol-3-kinase regulatory subunit 1, which were down-regulated upon stimulation of CD4(+) cells with anti-CD3/CD28 in vitro. Functional experiments with a synthetic inhibitor of miR-17 supported the link between miRNA expression and the altered target gene expression. Moreover, we found distinct responses of deregulated miRNA to stimulation, i.e. miR-17-5p and miR-193a were strongly up-regulated, in contrast to the down-regulation of miR-497, miR-1 and miR-126. Other deregulated miRNA did not respond to the stimulation probably due to other, non-T-cell activation related, mechanisms in their mode of action. Our findings support the role of miRNA-dependent regulatory mechanisms in the immunopathogenesis of MS. PMID:20148420

Lindberg, Raija L P; Hoffmann, Francine; Mehling, Matthias; Kuhle, Jens; Kappos, Ludwig

2010-03-01

368

Structure and conductivity of strontium-doped cerium orthovanadates Ce{sub 1-x}Sr{sub x}VO{sub 4} (0{<=}x{<=}0.175)  

SciTech Connect

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.

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

369

Electron transfer kinetics of self-assembled ferrocene (C12)Alkanethiol monolayers on gold electrodes from 125 K to 175 K  

Microsoft Academic Search

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

John N. Richardson; Gary K. Rowe; Michael T. Carter; Leonard M. Tender; Larry S. Curtin; Stephen R. Peck; Royce W. Murray

1995-01-01

370

Electron transfer kinetics of self-assembled ferrocene C(12) alkanethiol monolayers on gold electrodes from 125K to 175K  

Microsoft Academic Search

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

John N. Richardson; Gary K. Rowe; Michael T. Carter; Leonard M. Tender; Larry S. Curtin

1995-01-01

371

Statistical properties of secondary gamma-transitions in the175,176Lu(nres, gamma)176,177Lu reactions  

Microsoft Academic Search

The175,176Lu(n, gamma)176,177Lu reactions have been studied at the JINR Fast Pulsed Reactor IBR-30. Using a time-of-flight technique, gamma-ray spectra on isolated resonances have been measured. From analysis of secondary gamma-transition intensities resonance spins have been deduced for both reactions studied. Statistical treatment of the secondary gamma-ray intensities has shown, that population of low-lying levels in the product nuclei176,177Lu fluctuate from

L. Aldea; F. Becvr; Huynh Thuong Hiep; S. Pospsil; S. A. Telezhnikov

1978-01-01

372

Megakaryocytic expression of miRNA 10a, 17-5p, 20a and 126 in Philadelphia chromosome-negative myeloproliferative neoplasm.  

PubMed

Micro RNA (miRNA) are small non-coding RNA molecules which have a post-transcriptional inhibitory regulation function, e.g. 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 assay data, we selected miRNA 10a, 17-5p, 20a and 126 and potential target proteins (HOXA1, RUNX1) for analysis of laser-microdissected bone marrow megakaryocytes from Ph(-) MPN and controls (n=66). Furthermore, we tested a potential influence of cytoreductive treatment on miRNA expression in bone marrow cells during the course of Ph(-) MPN (n=18). In summary, miRNA 17-5p, 20a and 126 are constitutively expressed in Ph(-) MPN megakaryopoiesis while low or absent miRNA 10a appeared to correlate with strong megakaryocytic HOXA1 protein expression. No association to thrombocytosis, JAK2(V617F) mutations or cytoreductive treatment (bone marrow cells) were observed. PMID:18773208

Hussein, Kais; Dralle, Wiebke; Theophile, Katharina; Kreipe, Hans; Bock, Oliver

2008-09-05

373

Characterization of the PILATUS photon-counting pixel detector for X-ray energies from 1.75 keV to 60 keV  

NASA Astrophysics Data System (ADS)

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.

Donath, T.; Brandstetter, S.; Cibik, L.; Commichau, S.; Hofer, P.; Krumrey, M.; Lthi, B.; Marggraf, S.; Mller, P.; Schneebeli, M.; Schulze-Briese, C.; Wernecke, J.

2013-03-01

374

Two-year results of interspinous spacer (X-Stop) implantation in 175 patients with neurologic intermittent claudication due to lumbar spinal stenosis  

PubMed Central

The clinical outcome of patients with symptomatic lumbar spinal stenosis (LSS) was assessed during a follow-up period of 2years after X-Stop implantation. The X-Stop is the most commonly used interspinous distraction device in patients with neurogenic intermittent claudication due to LSS. Between 2003 and 2007, more than 1,000 patients were examined in our centre with symptoms of intermittent claudication due to spinal stenosis. Between February 2003 and June 2007, in 175 of these patients an X-Stop device was implanted in one or two levels. Patients were clinically evaluated regularly during a follow-up period of up to 4years using the VAS (leg pain) score and the Oswestry disability index. The mean VAS (leg pain) score in these 175 patients was reduced from 61.2% preoperatively to 39.0% at the first clincal follow-up examination at 6weeks postoperatively. The mean VAS score at 24months postoperatively was 39.0%. Oswestry score was 32.6% preoperatively, 22.7% at 6weeks, and 20.3% at 24months postoperatively on average. In eight out of the implanted 175 patients, the X-Stop had to be removed and a microsurgical decompression had to be performed because of unsatisfactory effect of the interspinous distraction device. Our single-centre results indicate not only a satisfactory short-term, but also a good long-term effect during a follow-up period of 2years. Functional MRI examinations provide helpful, positional-dependent preoperative information. More than any radiological feature, the typical clinical picture of positional-dependent claudication with a relief of symptoms during flexion is the most important factor for appropriate patient selection. The interspinous device does not replace microsurgical decompression in patients with massive stenosis and continuous claudication, but offers a save, effective and less invasive alternative in selected patients with spinal stenosis. Concerning the operative technique, a minimally invasive implantation with preservation of the interspinous ligament is appropriate. Functional (upright-) MRI examinations were able to demonstrate the positional-dependent stenosis. If available, fMRI represents the most helpful radiologic examination in assessing the outcome of interspinous spacer implantation.

Sobottke, Rolf; Eysel, Peer; Simons, Patrick

2009-01-01

375

X-ray structure at 1.75 resolution of a norovirus 3C protease linked to an active site-directed peptide inhibitor  

SciTech Connect

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.

Cooper, Jon [University of Southampton, England; Coates, Leighton [ORNL; Hussey, Robert [University of Southampton, England

2010-01-01

376

Hole mobility enhancement of Cu-deficient Cu1.75Zn(Sn1-xAlx)Se4 bulks  

NASA Astrophysics Data System (ADS)

Cu-deficient Cu1.75ZnSn1-xAlxSe4 (x=0-0.6) bulks were prepared by a liquid-phase reactive sintering method at 600 C with soluble sintering aids of Sb2S3 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-1 showed the highest hole mobility of 32.5 cm2 V-1 s-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.

Kuo, Dong-Hau; Tsega, Moges

2013-10-01

377

Surface Studies of High Voltage Lithium Rich Composition: Li1.2Mn0.525Ni0.175Co0.1O2  

SciTech Connect

This article reports the evidence of surface film formation because of the breakdown of electrolyte upon high voltage cycling (4.9 V) of lithium rich cathode having a nominal composition of, Li1.2Mn0.525Ni0.175Co0.1O2. We studied the chemical composition of this passivation film using electrochemical impedance, X-ray Photoelectron and micro-Raman spectroscopy and the results were compared against the pristine electrode. In order to distinguish the changes in the surface films composition induced by prolonged electrochemical cycling versus chemical passivation effect, we also studied the surface composition of cathode powders aged with electrolytes at 60 oC. Our study shows that electrodes cycled beyond 150 cycles showed a rapid drop in capacity due to increase in the surface film resistance resulting in limited capacity utilization.

Martha, Surendra K [ORNL; Veith, Gabriel M [ORNL; Dudney, Nancy J [ORNL; Nanda, Jagjit [ORNL

2012-01-01

378

Bragg diffraction using a 100 ps 17.5 keV x-ray backlighter and the Bragg diffraction imager  

SciTech Connect

A new diagnostic for measuring Bragg diffraction of petawatt-generated high-energy x rays off a laser-compressed crystal was designed and tested successfully at the Omega EP laser facility on static Mo and Ta (111) oriented single crystal samples using a 17.5 keV Mo K{alpha} backlighter. The Bragg diffraction imager consists of a heavily shielded enclosure and a precisely positioned beam block attached to the enclosure by an aluminum arm. Fuji image plates are used as the x-ray detectors. The diffraction from Mo and Ta (222) crystal planes was clearly detected with a high signal-to-noise. This technique will be applied to shock- and quasi-isentropically loaded single crystals on the Omega EP laser.

Maddox, B. R.; Park, H.-S.; Hawreliak, J.; Elsholz, A.; Van Maren, R.; Remington, B. A. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Comley, A. [AWE, Reading, Berkshire RG7 4PR (United Kingdom); Wark, J. S. [Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU (United Kingdom)

2010-10-15

379

Bragg diffraction using a 100 ps 17.5 keV x-ray backlighter and the Bragg diffraction imager  

NASA Astrophysics Data System (ADS)

A new diagnostic for measuring Bragg diffraction of petawatt-generated high-energy x rays off a laser-compressed crystal was designed and tested successfully at the Omega EP laser facility on static Mo and Ta (111) oriented single crystal samples using a 17.5 keV Mo K? backlighter. The Bragg diffraction imager consists of a heavily shielded enclosure and a precisely positioned beam block attached to the enclosure by an aluminum arm. Fuji image plates are used as the x-ray detectors. The diffraction from Mo and Ta (222) crystal planes was clearly detected with a high signal-to-noise. This technique will be applied to shock- and quasi-isentropically loaded single crystals on the Omega EP laser.

Maddox, B. R.; Park, H.-S.; Hawreliak, J.; Elsholz, A.; van Maren, R.; Remington, B. A.; Comley, A.; Wark, J. S.

2010-10-01

380

Microwave and photoluminesent characterizations of (Ca 2 Mg 3 )(X 1.75 Sb 0.25 )TiO 12 [X=Nb and Ta] ceramics  

Microsoft Academic Search

(Ca2Mg3)(X1.75Sb0.25)TiO12 [X=Nb and Ta] ceramics are prepared through the conventional solid-state route. The samples are calcined at 1,100 and 1,180C,\\u000a and are sintered at 1,250 and 1,375C. The substitution of Sb decreases the calcination and sintering temperatures of pure\\u000a (Ca2Mg3)(Nb\\/Ta)2TiO12. The structure of the samples is analyzed using X-ray diffraction method. The microstructure of the sintered pellet is studied\\u000a using

M. K. Suresh; P. R. S. Wariar; J. K. Thomas; Sam Solomon

2010-01-01

381

The expression ratio of miR-17-5p and miR-155 correlates with grading in canine splenic lymphoma.  

PubMed

In dogs as in humans, microRNAs (miRNAs) play a key role in normal and neoplastic hematopoiesis regulation. The general miRNA expression framework varies among different stages of development and differentiation of tumors, and miRNAs are widely investigated as new molecular tools for cancer diagnosis and classification. Canine lymphomas are currently classified according with the WHO classification, but a comprehensive grading study of clinical samples is still lacking, and molecular tools for quick grading are not yet available. In the present work, a retrospective study of the expression profile of a panel of miRNAs in canine primary splenic lymphomas was performed. The formalin fixed, paraffin embedded (FFPE) lymphoma samples were accurately classified according with the WHO classification, and were analyzed for miRNA expression using stem-loop TaqMan real time RT-PCR. For each miRNA investigated, relative and absolute quantification were performed after selecting the best housekeeping genes using the NormFinder and geNorm algorithms. The results of this study show a diversity in miRNA expression in low (L) grade lymphomas compared to intermediate-high (I-H) grade lymphomas. The molar ratio between miR-17-5p and miR-155 correlated with WHO grading. These results highlight the potential use of miR-17-5p/miR-155 molar ratio as a new molecular tool for grading of canine splenic lymphomas. The data here reported further support the utility of monitoring miRNA expression in canine hematopoietic malignancies diagnosis and prognosis. PMID:23871213

Albonico, Francesca; Mortarino, Michele; Avallone, Giancarlo; Gioia, Gloria; Comazzi, Stefano; Roccabianca, Paola

2013-07-03

382

Measurement and systematic study of (n,x) cross sections for dysprosium (Dy), erbium (Er), and ytterbium (Yb) isotopes at 14.7 MeV neutron energy  

NASA Astrophysics Data System (ADS)

Background: Neutron activation cross sections for energies around 14 MeV are required for various applications. Because cross-section data for the rare-earth elements are too scarce, there is a need for their accurate measurement and refinement. The accuracy of the evaluation and cross-section trend studies can be improved with reliable experimental data too.Purpose: The purpose of the paper is to provide measurements of new cross-section data and earlier published cross-section data with much better accuracy for lanthanide elementsDy, Er, and Yband the re-evaluation of available systematics for (n,x) reactions.Methods: The cross sections for (n,x) reactions were measured at (d-t) neutron energies with the activation technique. Theoretical calculations of cross-section values have been performed with the talys-1.2 code.Results: The sets of cross sections for (n,p), (n,2n), and (n,?) reactions were analyzed and the systematics were tested over the 156 ? A ? 176 mass region. The 156Dy(n,p)156Tb and 162Er(n,p)162Ho(m+g) cross-section values at 14.7 MeV neutron energy are reported for the first time. The 176Yb(n,d+pn)175Tm, 176Yb(n,n?)172Er, 162,163Dy(n,x)162Tb, and 163,164Dy(n,x)163Tb cross sections are obtained with much better accuracy. The reevaluation of systematics for (n,p) cross sections and the reexamination of a presence of isotopic effect in the target nuclei mass range was performed. It was done based on original and earlier available data.Conclusions: Obtained experimental results can be used for nuclear reaction model testing and could be considered as supplementary ones for nuclear data evaluation. The straight-line systematic dependence for (n,?) cross section was confirmed. For Er isotopes, a clear isotopic effect was observed in case of (n,p) reactions and pointed out the necessity of reconsidering the systematics.

Dzysiuk, N.; Kadenko, A.; Kadenko, I.; Primenko, G.

2012-09-01

383

Determination of the thermo-optic coefficient dn/dT of ytterbium doped ceramics (Sc2O3, Y2O3, Lu2O3, YAG), crystals (YAG, CaF2) and neodymium doped phosphate glass at cryogenic temperature  

NASA Astrophysics Data System (ADS)

In this paper, we report the measurements of the thermal expansion coefficient and the thermo-optic coefficient dn/dT for the ytterbium doped cubic sesquioxides (Sc2O3, Y2O3, Lu2O3) at cryogenic temperature. These materials appear to have very interesting properties for setting up high average power laser chains useful for plasma physics and for inertial fusion energy drivers. Measurements have also been done on YAG ceramic and crystal, CaF2 crystal, and neodymium phosphate glass (Hoya, LHG-8).

Cardinali, V.; Marmois, E.; Le Garrec, B.; Bourdet, G.

2012-04-01

384

MARCH1. 1; lwr meltdown accident response model. [CDC CYBER74,73,175; CDC6500; FORTRAN IV (92%) and COMPASS (8%). MARCH1. 1 was developed using CDC FORTRAN Extended  

Microsoft Academic Search

MARCH1.1 calculates primary system and containment response to small or large pipe breaks and transient accidents, which when combined with failure of engineered safety features can lead to core meltdown in water cooled reactors.CDC CYBER74,73,175;CDC6500; FORTRAN IV (92%) and COMPASS (8%). MARCH1.1 was developed using CDC FORTRAN Extended.; NOS\\/BE 1.4 (CDC CYBER74) and NOS 1.3 (CDC CYBER175); MARCH1.1 requires approximately

Wooton

2008-01-01

385

Large magnetovolume effects due to transition from the ferromagnetic to antiferromagnetic state in Hf0.825Ta0.175Fe2 intermetallic compound  

NASA Astrophysics Data System (ADS)

Intrinsic magnetic properties and magnetovolume effects have been investigated for the Hf0.825Ta0.175Fe2 itinerant-electron system, which exhibits a temperature-induced first-order transition from the ferromagnetic (FM) to the antiferromagnetic (AFM) state. The spontaneous volume magnetostriction contraction due to this transition from the high-volume FM state to the low-volume AFM state is about 0.66%. Applying a magnetic field increases significantly the FM-AFM transition temperature TFM-AFM, with a rate of 7.2 K T-1. At temperatures T > TFM-AFM a first-order metamagnetic transition between the AFM and FM states has been observed from isothermal magnetization curves, a result attributed to the itinerant-electron character of the Fe magnetism. This AFM-FM transition is accompanied by a huge field-induced volume magnetostriction. The change in ?V/V due to the AFM-FM transition is about 0.75%.

Diop, L. V. B.; Amara, M.; Isnard, O.

2013-10-01

386

Vertical and latitudinal variations in amino acid fluxes and compositions of settling particles along 175E in the North Pacific Ocean  

NASA Astrophysics Data System (ADS)

Settling particles collected by sediment traps deployed for about one year (1993-94) at four sites along 175E longitude in the central North Pacific have been analyzed for amino acids (AA) and amino sugars (or hexosamines, HA). These compounds account for about 12.5-27.9% of particulate organic carbon flux to the deep ocean. Biogeochemical indicator parameters varied in the range comparable with similar studies conducted in other oceanic sites. Correlations between non-protein AA (?-alanine and ?-aminobutyric acid) and flux parameters indicate repackaging of settling particulate organic matter (POM) around intermediate water depth (below 1500 m) at all trap sites. Mean values of indicator parameters in the shallow trap differ significantly (Student's t-test; p < 0.03) from those in deep traps at the same site. Latitudinal trends in POM flux and its labile composition suggest that relatively fresh POM is being deposited at a higher rate in the subarctic area of the Pacific. However, this trend is not so clear in deep traps, probably due to the influence of bioactive transport and deposition of laterally advected particles in these traps. Total and particulate organic carbon fluxes normalized to primary productivity estimates show a sharp rise in efficiency of the biological pump towards the subarctic area, which is responsible for enhanced fluxes of particles with a high labile content to the deep ocean in this part of the Pacific.

Gupta, Lallan P.; Kawahata, Hodaka

2003-04-01

387

K-shell ionization in (0.2 1.75) MeV/u Fe, Co + Cr and Fe + Cu collisions  

NASA Astrophysics Data System (ADS)

K-shell ionization cross-sections and mean vacancy sharing probabilities measured in the near-symmetric collision systems Fe, Co, Cu + Cr and Fe + Cu at 0.2 1.75 MeV/u energies are reported. Beams of 56Fe, 59Co and 63Cuq+ ions (3 ? q ? 12) delivered by the Van de Graaff tandem accelerator of NIPNE Bucharest were used. The cross-section values have been corrected for multiple ionization in the outer (L, M) shells by using the energy and yield shift method. Mean ionization probabilities per electron in the outer shells have been estimated. Calculations in the Briggs model, using SCA with relativistic hydrogenic wave functions and binding energy corrections, could explain the 2p?-molecular orbital ionization cross-sections at higher energies (?1 MeV/u). The vacancy sharing results show that predictions of the two-state coupling Demkov Meyerhof model are less fulfilled at higher energies (?1.5 MeV/u).

Ciortea, C.; Piticu, I.; Fluera?u, D.; Dumitriu, D. E.; Enulescu, A.; Gugiu, M. M.; Radu, A. T.; Penescu, L. C.

2005-07-01

388

17.5% p-Type Silicon Heterojunction Solar Cells with HWCVD a-Si:H as the Emitter and Back Contact  

SciTech Connect

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.

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

389

Structural and magnetic characterization of LiMn{sub 1.825}Cr{sub 0.175}O{sub 4} spinel obtained by ultrasonic spray pyrolysis  

SciTech Connect

Quaternary spinel oxide LiMn{sub 1.825}Cr{sub 0.175}O{sub 4} powder was synthesized by using an ultrasonic spray pyrolysis method, without additional annealing. The crystal structure of the as-prepared powder was revealed by X-ray powder diffraction and identified as a single spinel phase with Fd3m space group. The powders had a spherical morphology with extremely smooth surface appearance and densely congested interior structure. Transmission electron microscopy confirmed that the particle consisted by the cohesion of the primary particles. Magnetic measurements performed in DC field in both zero-field-cooled and field-cooled regimes, as well as AC susceptibility experiments, show that system undergoes spin-glass transition at the freezing temperature T {sub f} = 20 K. The value of the effective magnetic moment {mu} {sub eff} = 4.34 {mu} {sub B} obtained from the Curie-Weiss fit in the high temperature region confirms the substitution of Mn{sup 3+} ions with Cr{sup 3+} ions.

Jugovic, D. [Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Knez Mihailova 35/IV, 11 000 Belgrade (Serbia); Cvjeticanin, N. [Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, P.O. Box 137, Belgrade (Serbia); Kusigerski, V. [Vinca Institute of Nuclear Sciences, Laboratory for Theoretical and Condensed Matter Physics, P.O. Box 522, 11001 Belgrade (Serbia); Mitric, M. [Vinca Institute of Nuclear Sciences, Laboratory for Theoretical and Condensed Matter Physics, P.O. Box 522, 11001 Belgrade (Serbia); Miljkovic, M. [Faculty of Medicine, University of Nis (Serbia); Makovec, D. [Jozef Stefan Institute, Ljubljana (Slovenia); Uskokovic, D. [Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Knez Mihailova 35/IV, 11 000 Belgrade (Serbia)

2007-03-22

390

IDCS J1426.5+3508: Sunyaev-Zel'dovich Measurement of a Massive Infrared-selected Cluster at z = 1.75  

NASA Astrophysics Data System (ADS)

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 200, m = (4.3 1.1) 1014 M ? in agreement with the approximate X-ray mass of ~5 1014 M ?. 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 ~1% probability of finding it in the 8.82 deg2 IRAC Distant Cluster Survey, IDCS J1426.5+3508 is not completely unexpected in ?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.

Brodwin, M.; Gonzalez, A. H.; Stanford, S. A.; Plagge, T.; Marrone, D. P.; Carlstrom, J. E.; Dey, A.; Eisenhardt, P. R.; Fedeli, C.; Gettings, D.; Jannuzi, B. T.; Joy, M.; Leitch, E. M.; Mancone, C.; Snyder, G. F.; Stern, D.; Zeimann, G.

2012-07-01

391

The Risks and Benefits of Long-term Use of Hydroxyurea in Sickle Cell Anemia: A 17.5 Year Follow-Up  

PubMed Central

A randomized, controlled clinical trial established the efficacy and safety of short-term use of hydroxyurea in adult sickle cell anemia. To examine the risks and benefits of long-term hydroxyurea usage, patients in this trial were followed for 17.5 years during which they could start or stop hydroxyurea. The purpose of this follow-up was to search for adverse outcomes and estimate mortality. For each outcome and for mortality, exact 95% confidence intervals were calculated, or tests were conducted at ? = 0.05 level (p-value <0.05 for statistical significance). Although the death rate in the overall study cohort was high (43.1%; 4.4 per 100 person-years), mortality was reduced in individuals with long-term exposure to hydroxyurea. Survival curves demonstrated a significant reduction in deaths with long-term exposure. Twenty-four percent of deaths were due to pulmonary complications; 87.1% occurred in patients who never took hydroxyurea or took it for <5 years. Stroke, organ dysfunction, infection and malignancy were similar in all groups. Our results, while no longer the product of a randomized study because of the ethical concerns of withholding an efficacious treatment, suggest that long-term use of hydroxyurea is safe and might decrease mortality.

Steinberg, MH; McCarthy, WF; Castro, O; Ballas, SK; Armstrong, FD; Smith, W; Ataga, K; Swerdlow, P; Kutlar, A; DeCastro, L; Waclawiw, MA

2010-01-01

392

1.75 h {sup -1} kpc SEPARATION DUAL ACTIVE GALACTIC NUCLEI AT z = 0.36 IN THE COSMOS FIELD  

SciTech Connect

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.

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

393

[Influence of 175-m-impoundment in Three Gorges Reservoir area on the food web energy sources of main commercial fishes in backwater area of xiaojiang River].  

PubMed

The impoundment in the Three Gorges Reservoir Area (TGRA) was first reached 175 m in 2010. To approach the influence of this impoundment on the food web energy sources of fishes in the tributaries of TRGA, an analysis was made on the food web energy sources of seven economically important fishes (Carassius auratus, Cyprinus carpio, Silurus asotus, Culter mongolicus mongolicus, Mystus macropterus, Pelteobagrus vachelli, and Pelteobagrus nitidus) in the backwater area of Xiaojiang River by using stable isotope method in combining with IsoSource Model. The results showed that before this impoundment (July 2010), microalgae were the main energy sources for the seven species. After this impoundment (December 2010), the contribution ratio of the microalgae decreased somewhat, while the relative contribution of terrestrial C4 plants had an obvious increase. Especially for crucian carp (C. auratus) and catfish (S. asotus), the contribution rate of the C4 plants reached 38-54% and 32-50%, respectively. After the impoundment, at least 30% of the energy resources of these two fishes were come from terrestrial C4 plants, suggesting that the impoundment in TGRA increased the contribution rate of exogenous terrestrial C4 plants as the energy sources of fishes. PMID:24066562

Li, Bin; Wang, Zhi-Jian; Yue, Xing-Jian; Wang, Yong-Ming; Jin, Li; Zhang, Yao-Guang

2013-06-01

394

Older Americans Act Amendments of 1987: A Summary of Provisions. Public Law 100-175. An Information Paper Prepared for Use by the Special Committee on Aging. United States Senate, 100th Congress, 1st Session.  

ERIC Educational Resources Information Center

The Older American Act Amendments of 1987 (Public Law 100-175) contain no major overhaul of the Act, but new provisions do significantly expand certain service components of the state and area agency on aging program under title III to address the special needs of certain populations, including the frail elderly living at home, residents of

O'Shaughnessy, Carol

395

Bragg diffraction using a 100ps 17.5 keV x-ray backlighter and the Bragg Diffraction Imager  

SciTech Connect

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.

Maddox, B R; Park, H; Hawreliak, J; Comley, A; Elsholz, A; Van Maren, R; Remington, B A; Wark, J

2010-05-13

396

The Streptomyces lividans family 12 endoglucanase: construction of the catalytic cre, expression, and X-ray structure at 1.75 A resolution.  

PubMed

Cellulases are the glycoside hydrolases responsible for the enzymatic breakdown of the structural plant polymer cellulose. Together with xylanases they counteract the lmitless accumulation of plant biomass in nature and are of considerable fundamental and biotechnological interest. Endoglucanase CelB from Streptomyces lividans performs hydrolysis of the beta-1,4-glycosidic bonds of cellulose, with net retention of anomeric configuration. The enzyme is a member of glycoside hydrolase family 12 [Henrissat, B., and Bairoch, A. (1996) Biochem. J. 316, 695-696], which had previously eluded detailed structural analysis. A truncated, but cataytically competent form of CelB, locking the flexible linker region and cellulose-binding domain, has been constructed and overexpressed in a S. lividans expression system. The three-dimensional X-ray structure of the resulting catalytic domain, CelB2, has been solved by conventional multiple isomorphous replacement methods and refined to an R factor of 0.187 at 1.75 A resolution. The overall fold of the enzyme shows a remarkable similarity to that of family 11 xylanases, as previously predicted by hydrophobic clustering analysis [Trrnen, A., Kubicek, C.P., and Henrissat, B. (1993) FEBS Lett. 321, 135-139]. The 23 kDa protein presents a jelly-roll topology, built up mainly by antiparallel beta-sheets arranged in a sandwich-like manner. A deep substrate-binding cleft runs across the surface, as has been observed in other endoglucanase structures, and is potentially able to accommodate up to five binding subsites. The likely catalytic nucleophile and Brnsted acid/base, residues Glu 120 and Glue 203, respectively, have their carboxylate groups separated by a distance of approximately 7.0 A and are located approximately 15 A from one end of the cleft, implying a -3 to +2 active site. PMID:9440876

Sulzenbacher, G; Shareck, F; Morosoli, R; Dupont, C; Davies, G J

1997-12-23

397

CO2 adsorption studies on hydroxy metal carbonates M(CO3)x(OH)y (M = Zn, Zn-Mg, Mg, Mg-Cu, Cu, Ni, and Pb) at high pressures up to 175 bar.  

PubMed

Carbon dioxide (CO(2)) adsorption capacities of several hydroxy metal carbonates have been studied using the state-of-the-art Rubotherm sorption apparatus to obtain adsorption and desorption isotherms of these compounds up to 175 bar. The carbonate compounds were prepared by simply reacting a carbonate (CO(3)(2-)) solution with solutions of Zn(2+), Zn(2+)/Mg(2+), Mg(2+), Cu(2+)/Mg(2+), Cu(2+), Pb(2+), and Ni(2+) metal ions, resulting in hydroxyzincite, hydromagnesite, mcguinnessite, malachite, nullaginite, and hydrocerussite, respectively. Mineral compositions are calculated by using a combination of powder XRD, TGA, FTIR, and ICP-OES analysis. Adsorption capacities of hydroxy nickel carbonate compound observed from Rubotherm magnetic suspension sorption apparatus has shown highest performance among the other components that were investigated in this work (1.72 mmol CO(2)/g adsorbent at 175 bar and 316 K). PMID:21805978

Karadas, Ferdi; Yavuz, Cafer T; Zulfiqar, Sonia; Aparicio, Santiago; Stucky, Galen D; Atilhan, Mert

2011-08-15

398

Activation cross sections and isomeric cross section ratios for the (n,2n) reactions on 175Lu, 198Pt and 82Se from 13.5 to 14.6 MeV  

NASA Astrophysics Data System (ADS)

The cross sections for the 175Lu(n,2n)174m,gLu, 198Pt(n,2n)197m,gPt and 82Se(n,2n)81m,gSe reactions and their isomeric cross section ratios ?m/?g have been measured in the neutron energy range of 13.5 14.6 MeV using the activation technique. Nuclear model calculations using the code HFTT, which employs the Hauser Feshbach (statistical model) and exciton model (precompound effects) formalisms, were undertaken to describe the formation of the products. The total cross sections for the (n,2n) reaction on 175Lu, 198Pt and 82Se are compared with experimental data found in the literature, with results of published empirical formulae, and with values of model calculations including the pre-equilibrium contribution.

Luo, Junhua; Xu, Xiaosan; Cao, Xuexiang; Kong, Xiangzhong

2007-12-01

399

Effect of chloride ion on the anodic polarization behavior of the Zr 65Al 7.5Ni 10Cu 17.5 amorphous alloy in phosphate buffered solution  

Microsoft Academic Search

The corrosion behavior of the Zr65Al7.5Ni10Cu17.5 amorphous alloy was investigated in a phosphate buffered saline solution and in phosphatecitric acid buffered solutions with various chloride-ion concentrations from 0 to 1.0 M, to examine the performance of the alloy as a biomaterial. The surface condition of the non-polarized and polarized alloy in the passive region was characterized using X-ray photoelectron spectroscopy.

S. Hiromoto; A.-P. Tsai; M. Sumita; T. Hanawa

2000-01-01

400

Expression analysis of mir-17-5p, mir-20a and let-7a microRNAs and their target proteins in CD34+ bone marrow cells of patients with myelodysplastic syndromes.  

PubMed

Mir-17-5p and mir-20a, members of the mir-17-92 family, down-regulate E2F1, which is over-expressed in myelodysplastic syndromes (MDS). Moreover, let-7a down-regulates KRAS, which is aberrantly expressed in MDS. We evaluated the expression of the aforementioned microRNAs in CD34+ cells of 43 MDS patients using real-time PCR and their target proteins (E2F1, MYC, BCL2, CCND1, and KRAS) by Western blot. Mir-17-5p and mir-20a were under expressed in high risk MDS patients, compared to low risk MDS patients. Similarly, let-7a was under expressed in patients with intermediate or high-risk karyotype. Interestingly, there was an inverse correlation between microRNA and the expression levels of their targets. Importantly, mir-17-5p and mir-20a constitute favorable prognostic factors in MDS, since their expression was associated with increased overall survival of MDS patients. PMID:23246221

Vasilatou, Diamantina; Papageorgiou, Sotirios G; Kontsioti, Frieda; Kontos, Christos K; Tsiotra, Panayiota; Mpakou, Vassiliki; Pavlou, Maria-Angeliki S; Economopoulou, Christina; Dimitriadis, George; Dervenoulas, John; Pappa, Vasiliki

2012-12-14

401

Genetic diversity of polymorphic vaccine candidate antigens (apical membrane antigen-1, merozoite surface protein-3, and erythrocyte binding antigen-175) in Plasmodium falciparum isolates from western and central Africa.  

PubMed

The malaria vaccine candidate antigens erythrocyte binding antigen 175 (EBA-175), merozoite surface protein 3 (MSP-3), and apical membrane antigen (AMA-1) from Plasmodium falciparum isolates from countries in central and west Africa were assessed for allelic diversity. Samples were collected on filter paper from 600 P. falciparum-infected symptomatic patients in Cameroon, Republic of Congo, Burkina Faso, Ghana, and Senegal and screened for class-specific amplification fragments. Genetic diversity, assessed by mean heterozygosity, was comparable among countries. We detected a clinical increase in eba 175 F-allele frequency from west to east across the study region. No statistical difference in msp-3 allele distribution between countries was observed. The ama-1 3D7 alleles were present at a lower frequency in central Africa than in West Africa. We also detected little to no genetic differentiation among sampling locations. This finding indicates that, at least at the level of resolution offered by restriction fragment length polymorphism analysis, these antigens showed remarkable genetic homogeneity throughout the region sampled, perhaps caused by balancing selection to maintain a diverse array of antigen haplotyes. PMID:21292899

Soulama, Issiaka; Bigoga, Jude D; Ndiaye, Magatte; Bougouma, Edith C; Quagraine, Josephine; Casimiro, Prisca N; Stedman, Timothy T; Sirima, Sodiomon B

2011-02-01

402

A Coral Based Reconstruction of Atmospheric ?14C through the Mystery Interval (17.5 to 14.5 kyr BP)  

NASA Astrophysics Data System (ADS)

Reconstructions of atmospheric ?14C from various archives (speleothems, planktic foraminifera, surface corals) record a ~ 190 per mil (%) decrease in ?14C during the Mystery Interval (17.5 to 14.5 kyr BP). It has been suggested that the decrease results from the injection of 14C depleted waters during the deglacial. Supporting evidence comes from benthic forams in sediment cores off Baja, CA that record a 300% decrease in the 14C content of intermediate waters at the same time ice core records display an increase in atmospheric CO2. Records of opal burial in Southern Ocean sediments suggest increased upwelling (and release of 14C depleted CO2 to the atmosphere) during the Mystery Interval. We have updated our previously published record of atmospheric ?14C with an additional 60-paired radiocarbon and U-series dated surface corals. A unique advantage to using the fossil coral archive is that both radiocarbon and calendar ages can be obtained from the same sample, whereas atmospheric 14C reconstructions generated from deep sea core microfossils require assigned calendar ages which are based on proxies correlated to ice cores and are subject to proxy interpretations, correlation errors, and uncertainties in ice core chronologies. Unfortunately small inaccuracies in the estimated calendar ages lead to large ?14C errors. The updated coral record adds considerable coverage to both the Mystery Interval (previously constrained by coral data only at the boundaries in INTCAL04 and 09), and for the time period 26 to 18 kyr BP. Our record permits a better estimate as to the timing, duration, and magnitude of the decrease in ?14C during the Mystery Interval. We observe a break in the declining 27 to 21 kyr BP trend of ?14C at about 20 kyr BP. From 20 to 18.5 kyr BP ?14C increases by about 100% to a maximum value of about 430%. ?14C decreases to 300% by about 17 kyr BP at which time the long term declining trend in ?14C is re-established and continues throughout the duration of the Mystery Interval. Thus, a ~130% decrease in atmospheric ?14C recorded by corals precedes the Mystery Interval and atmospheric CO2 rise. We observe a second, more abrupt (less than 800 years) ~100% decrease in ?14C prior to the Blling-Allerd period which appears as a plateau in the radiocarbon vs. calendar age relationship. An increase in atmospheric ?14C between 20 and 18.5 kyr BP could be explained by increased production as a result of a weakening of the earth's magnetic field or from reduced deep-water formation. Paleointensity records from North Atlantic deep-sea cores suggest weakening in the magnetic field at about 20 kyr BP and magnetic data from Lake Bailkal, Biwa, and Hawaiian lavas also support a short term magnetic excursion centered at about 20 ka BP. The accumulation of cosmogenic nuclides (36Cl, 10Be) in Greenland ice, however, does not provide compelling evidence for significantly reduced field strength at this time.

Mortlock, R. A.; Abdul, N. A.; Wright, J. D.; Fairbanks, R. G.; Cao, L.

2011-12-01

403

Both Corynebacterium diphtheriae DtxR(E175K) and Mycobacterium tuberculosis IdeR(D177K) are dominant positive repressors of IdeR-regulated genes in M. tuberculosis.  

PubMed

The diphtheria toxin repressor (DtxR) is an important iron-dependent transcriptional regulator of known virulence genes in Corynebacterium diphtheriae. The mycobacterial iron-dependent repressor (IdeR) is phylogenetically closely related to DtxR, with high amino acid similarity in the DNA binding and metal ion binding site domains. We have previously shown that an iron-insensitive, dominant-positive dtxR(E175K) mutant allele from Corynebacterium diphtheriae can be expressed in Mycobacterium tuberculosis and results in an attenuated phenotype in mice. In this paper, we report the M. tuberculosis IdeR(D177K) strain that has the cognate point mutation. We tested four known and predicted IdeR-regulated gene promoters (mbtI, Rv2123, Rv3402c, and Rv1519) using a promoterless green fluorescent protein (GFP) construct. GFP expression from these promoters was abrogated under low-iron conditions in the presence of both IdeR(D177K) and DtxR(E175K), a result confirmed by reverse transcription-PCR. The IdeR regulon can be constitutively repressed in the presence of an integrated copy of ideR containing this point mutation. These data also suggest that mutant IdeR(D177K) has a mechanism similar to that of DtxR(E175K); iron insensitivity occurs as a result of SH3-like domain binding interactions that stabilize the intermediate form of the repressor after ancillary metal ion binding. This construct can be used to elucidate further the IdeR regulon and its virulence genes and to differentiate these from genes regulated by SirR, which does not have this domain. PMID:16113319

Manabe, Yukari C; Hatem, Christine L; Kesavan, Anup K; Durack, Justin; Murphy, John R

2005-09-01

404

Both Corynebacterium diphtheriae DtxR(E175K) and Mycobacterium tuberculosis IdeR(D177K) Are Dominant Positive Repressors of IdeR-Regulated Genes in M. tuberculosis  

PubMed Central

The diphtheria toxin repressor (DtxR) is an important iron-dependent transcriptional regulator of known virulence genes in Corynebacterium diphtheriae. The mycobacterial iron-dependent repressor (IdeR) is phylogenetically closely related to DtxR, with high amino acid similarity in the DNA binding and metal ion binding site domains. We have previously shown that an iron-insensitive, dominant-positive dtxR(E175K) mutant allele from Corynebacterium diphtheriae can be expressed in Mycobacterium tuberculosis and results in an attenuated phenotype in mice (Y. C. Manabe, B. J. Saviola, L. Sun, J. R. Murphy, and W. R. Bishai, Proc. Natl. Acad. Sci. USA 96:12844-12848, 1999). In this paper, we report the M. tuberculosis IdeR(D177K) strain that has the cognate point mutation. We tested four known and predicted IdeR-regulated gene promoters (mbtI, Rv2123, Rv3402c, and Rv1519) using a promoterless green fluorescent protein (GFP) construct. GFP expression from these promoters was abrogated under low-iron conditions in the presence of both IdeR(D177K) and DtxR(E175K), a result confirmed by reverse transcription-PCR. The IdeR regulon can be constitutively repressed in the presence of an integrated copy of ideR containing this point mutation. These data also suggest that mutant IdeR(D177K) has a mechanism similar to that of DtxR(E175K); iron insensitivity occurs as a result of SH3-like domain binding interactions that stabilize the intermediate form of the repressor after ancillary metal ion binding. This construct can be used to elucidate further the IdeR regulon and its virulence genes and to differentiate these from genes regulated by SirR, which does not have this domain.

Manabe, Yukari C.; Hatem, Christine L.; Kesavan, Anup K.; Durack, Justin; Murphy, John R.

2005-01-01

405

Precision Atomic Masses of Strontium and Ytterbium  

NASA Astrophysics Data System (ADS)

Currently the second most precise value for the fine structure constant is derived from ``photon-recoil'' measurements of h/M(Rb) combined with measurements of the Rydberg constant, atomic transition frequencies, and atomic masses of the electron and Rubidium. An improved value for alpha using this method will enable the combination of theory and experiment for the g-factor of the electron, which produces the most precise value for alpha, to provide a further improved test of QED. Besides the alkalis, isotopes of Sr and Yb make promising candidates for photon-recoil measurements of h/M(atom). Using single-ion, cryogenic precision Penning trap techniques, we are measuring their atomic masses with the aim of a precision of 0.1ppb, a factor of 100 or more improvement over current values.

Rana, Raman; Zarrella, Andrew; Myers, Edmund

2011-06-01

406

Calculation of parity nonconservation in neutral ytterbium  

SciTech Connect

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.

Dzuba, V. A.; Flambaum, V. V. [School of Physics, University of New South Wales, Sydney, New South Wales 2052 (Australia)

2011-04-15

407

Hexadecapole shape change in ytterbium isotopes  

SciTech Connect

In Hartree-Fock calcualtions using nonrelativistic and relativistic models we see a change in sign from positive to negative of the hexadecapole moment with mass number around [ital A]=170. Analysis of Hartree-Fock orbitals shows that a group of neutron orbits with large negative hexadecapole moments occur together at the Fermi surface near [ital N]=100 and are responsible for the shape change.

Patra, S.K.; Yoshida, S.; Takigawa, N. (Department of Physics, Faculty of Sciences, Tohoku University, 980-77 Sendai (Japan)); Praharaj, C.R. (Institute of Physics, Bhubaneswar-751 005 (India)); Rath, A.K. (Post Graduate Department of Physics, Sambalpur University, Jyotivihar, Burla-768 019 (India))

1995-04-01

408

Efficacy and tolerability of once-weekly administration of 17.5?mg risedronate in Japanese patients with involutional osteoporosis: a comparison with 2.5-mg once-daily dosage regimen  

Microsoft Academic Search

In this multicenter, randomized, double-blind controlled trial, the efficacy and safety of once-weekly dosing with 17.5?mg\\u000a risedronate was compared with once-daily dosing with 2.5?mg risedronate in Japanese patients with involutional osteoporosis.\\u000a A total of 496 patients were randomized to receive either once-weekly (n = 249) or once-daily (n = 247) treatment. All patients were supplemented with 200?mg\\/day calcium. Following 48

Hideaki Kishimoto; Masao Fukunaga; Kazuhiro Kushida; Masataka Shiraki; Akira Itabashi; Hajime Nawata; Toshitaka Nakamura; Hiroaki Ohta; Kunio Takaoka; Yasuo Ohashi

2006-01-01

409

Evidence for two fluids in cuprate superconductors from a nuclear resonance study of (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy  

NASA Astrophysics Data System (ADS)

We report charge density measurements, using NMR, in the superconducting compound (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy , which has two independent variables, x (family) and y (oxygen). For underdoped samples we find the rate at which holes are introduced into the plane upon oxygenation to be family independent. In contrast, not all carriers contribute to either antiferromagnetic or superconducting order parameters. This result is consistent with a two-fluid phenomenology or intrinsic mesoscopic inhomogeneities in the bulk. We also discuss the impact of weak chemical disorder on Tc .

Keren, Amit; Kanigel, Amit; Bazalitsky, Galina

2006-11-01

410

Activation cross sections and isomeric cross section ratios for the (n,2n) reactions on 175Lu, 198Pt and 82Se from 13.5 to 14.6 MeV  

Microsoft Academic Search

The cross sections for the 175Lu(n,2n)174m,gLu, 198Pt(n,2n)197m,gPt and 82Se(n,2n)81m,gSe reactions and their isomeric cross section ratios ?m\\/?g have been measured in the neutron energy range of 13.514.6MeV using the activation technique. Nuclear model calculations using the code HFTT, which employs the HauserFeshbach (statistical model) and exciton model (precompound effects) formalisms, were undertaken to describe the formation of the products. The

Junhua Luo; Xiaosan Xu; Xuexiang Cao; Xiangzhong Kong

2007-01-01

411

Electrochemical and rate performance study of high-voltage lithium-richcomposition: Li1.2Mn0.525Ni0.175Co0.1O2  

SciTech Connect

We report electrochemical studies of high voltage cathodes composed of lithium rich layeredlayered material having the nominal composition Li1.2Mn0.525Ni0.175Co0.1O2, or equivalently 0.6Li[Li1/3Mn2/3]O2 0.4Li[Mn0.3Ni0.45Co0.25]O2. These aspects were investigated by cyclic voltammetry studies in conjunction with electrochemical impedance spectroscopy measurements to understand the redox reactions involving multiple transition metals and their capacity contribution at higher voltages, up to 4.9 V. Further, cathodes with 1.5 wt.% carbon nanofibers added to the Li1.2Mn0.525Ni0.175Co0.1O2 composite electrode showed stable reversible capacities of about 280 mAh g 1 when cycled to 4.9 V for more than 100 cycles, and almost a factor of two improvements in the rate performance compared to the electrode composition prepared using conventional composition (7.5% carbon black and 7.5% binder).

Martha, Surendra K [ORNL; Nanda, Jagjit [ORNL; Veith, Gabriel M [ORNL; Dudney, Nancy J [ORNL

2012-01-01

412

Secheniya radiatsionnogo zakhvata i propuskaniya bystrykh nejtronov dlya izotopov redkozemel'nykh ehlementov, (sup 181)Ta i (sup 187)O. (Cross sections of fast neutron capture and transmission for the rare earth element isotopes, (sup 181)Ta and (sup 187)O).  

National Technical Information Service (NTIS)

Neutron capture cross sections for (sup 158,160)Gd, (sup 159)Td, (sup 160)Ho, (sup 170,171,172,173,174,175,176)Yb, (sup 175)Lu, (sup 176,177,178,179,180)Hf, (sup 187)Os in the energy range -450 keV and neutron transmissions natural ytterbium, hafniun and ...

M. V. Bokhovko A. A. Voevodskij V. N. Kononov E. D. Poletaev V. M. Timokhov

1991-01-01

413

Critical-doping universality for cuprate superconductors: Oxygen nuclear-magnetic-resonance investigation of (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy  

NASA Astrophysics Data System (ADS)

The critical doping levels in cuprates, where the ground state changes its nature (from an antiferromagnet to a spin glass to superconductor to metal), are not universal. We investigate the origin of these critical doping variations by measuring the in-plane oxygen p? hole density in the CuO2 layers as a function of the oxygen density y in (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy (CLBLCO). This is done using the oxygen 17 nuclear quadrupole resonance parameter ?Q . We compare compounds with x=0.1 and 0.4 which have significant critical y variations and find that these variations can be explained by a change in the efficiency of hole injection into the p? orbital. This allows us to generate a unified phase diagram for the CLBLCO system across the entire doping range, with no adjustable parameters.

Amit, Eran; Keren, Amit

2010-11-01

414

21 CFR 145.175 - Canned pears.  

Code of Federal Regulations, 2013 CFR

...iii) of this section are used, such words may be combined as for example, Seasoned with cider vinegar, cloves, and cinnamon oil. (ii) The style and forms of units of the pear ingredient as provided in paragraph (a)(2) of this section and the name of the packing medium...

2013-04-01

415

27 CFR 9.175 - Dos Rios.  

Code of Federal Regulations, 2013 CFR

...TREASURY ALCOHOL AMERICAN VITICULTURAL AREAS Approved American Viticultural Areas...Eel River and the Middle Fork of the Eel River...intersection with the eastern boundary of section...line, crossing the Middle Fork of the...

2013-04-01

416

21 CFR 189.175 - P-4000.  

Code of Federal Regulations, 2010 CFR

...not found in natural products at levels detectable by the official methodology, and has been proposed for use as an artificial sweetener. (b) Food containing any added or detectable level of P-4000 is deemed to be adulterated in violation...

2010-01-01

417

21 CFR 189.175 - P-4000.  

Code of Federal Regulations, 2013 CFR

...not found in natural products at levels detectable by the official methodology, and has been proposed for use as an artificial sweetener. (b) Food containing any added or detectable level of P-4000 is deemed to be adulterated in violation...

2013-04-01

418

Pancrelipase 22-175 Statistical PREA  

Center for Drug Evaluation (CDER)

Text Version... This data was reviewed by the Product Quality Reviewer (see Quality review authored by ... after washing off the applesauce with distilled water to the ... More results from www.fda.gov/downloads/drugs/developmentapprovalprocess

419

21 CFR 175.105 - Adhesives.  

Code of Federal Regulations, 2013 CFR

...Reg. No. 124-68-5) Polyvinyl alcohol modified so as to contain...having 12 to 20 carbon atoms Polyvinyl butyral Polyvinyl formal Potassium ferricyanide...β-Propiolactone Propyl alcohol (propanol) Propylene...

2013-04-01

420

40 CFR 264.175 - Containment.  

Code of Federal Regulations, 2013 CFR

...contain leaks, spills, and accumulated precipitation until the collected material is detected...resulting from leaks, spills, or precipitation, unless the containers are elevated...Spilled or leaked waste and accumulated precipitation must be removed from the sump or...

2013-07-01

421

49 CFR 175.30 - Inspecting shipments.  

Code of Federal Regulations, 2012 CFR

...prior to loading aboard the aircraft. (c) A hazardous material may be carried aboard an aircraft only if, based on the inspection...section do not apply to Dry ice (carbon dioxide, solid...package bearing the CARGO AIRCRAFT ONLY label unless...

2012-10-01

422

49 CFR 175.30 - Inspecting shipments.  

Code of Federal Regulations, 2011 CFR

...prior to loading aboard the aircraft. (c) A hazardous material may be carried aboard an aircraft only if, based on the inspection...section do not apply to Dry ice (carbon dioxide, solid...package bearing the CARGO AIRCRAFT ONLY label unless...

2011-10-01

423

22 CFR 17.5 - Financial hardship.  

Code of Federal Regulations, 2013 CFR

...FOREIGN SERVICE RETIREMENT AND DISABILITY FUND UNDER THE FOREIGN SERVICE RETIREMENT...substantially all of his or her current income and liquid assets to meet current ordinary and necessary...shall be placed upon the individual's liquid assets and current income in making...

2013-04-01

424

21 CFR 145.175 - Canned pears.  

Code of Federal Regulations, 2010 CFR

...4) If the quality of canned pears falls below the standard...if the quality of the canned pears falls below standard with...of substandard quality (Good FoodNot High Grade...this section which the canned pears fail to meet, as follows:...

2009-04-01

425

21 CFR 145.175 - Canned pears.  

Code of Federal Regulations, 2010 CFR

...4) If the quality of canned pears falls below the standard...if the quality of the canned pears falls below standard with...of substandard quality (Good FoodNot High Grade...this section which the canned pears fail to meet, as follows:...

2010-04-01

426

Pancrelipase 22-175 Clinical PREA  

Center for Drug Evaluation (CDER)

Text Version... at any time during the study), mineral oil and castor oil, olestra (fat ... Patients in sequence AB were randomized to receive Pancrecarb during the first ... More results from www.fda.gov/downloads/drugs/developmentapprovalprocess

427

40 CFR 96.175 - Petitions.  

Code of Federal Regulations, 2013 CFR

...NOX unit that is subject to an Acid Rain emissions limitation may submit... unit that is not subject to an Acid Rain emissions limitation may submit...NOX unit that is subject to an Acid Rain emissions limitation may submit...

2013-07-01

428

25 CFR 175.30 - Billing.  

Code of Federal Regulations, 2013 CFR

...delivery. A reasonable estimate of the amount of energy and/or power demand...shall be based on the pattern of the customer's prior consumption, or on an estimate of the...electric load where no billing history exists. (b)...

2013-04-01

429

33 CFR 175.105 - Definitions.  

Code of Federal Regulations, 2013 CFR

...Coastal waters means: (1) The U.S. waters of the Great Lakes (Lake Erie, Huron, Michigan, Ontario, and Superior...and (3) Those waters directly connected to the Great Lakes and territorial seas (i.e. , bays,...

2013-07-01

430

21 CFR 169.175 - Vanilla extract.  

Code of Federal Regulations, 2013 CFR

...AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION FOOD DRESSINGS AND FLAVORINGS Requirements...Glycerin. (2) Propylene glycol. (3) Sugar (including invert sugar). (4) Dextrose. (5) Corn sirup...

2013-04-01

431

49 CFR 175.704 - Plutonium shipments.  

Code of Federal Regulations, 2012 CFR

...aboard the aircraft on the main deck or the lower cargo compartment in the aft-most location that is possible for cargo of its size and weight, and no other cargo may be stowed aft of packages containing plutonium. (c) A package of plutonium...

2012-10-01

432

49 CFR 175.704 - Plutonium shipments.  

Code of Federal Regulations, 2011 CFR

...aboard the aircraft on the main deck or the lower cargo compartment in the aft-most location that is possible for cargo of its size and weight, and no other cargo may be stowed aft of packages containing plutonium. (c) A package of plutonium...

2011-10-01

433

33 CFR 175.3 - Definitions.  

Code of Federal Regulations, 2010 CFR

...racing associations for use in competitive racing and one in which all occupants row, scull, or paddle, with the exception of a coxswain, if one is provided, and is not designed to carry and does not carry any equipment not solely for competitive racing....

2009-07-01

434

21 CFR 175.105 - Adhesives.  

Code of Federal Regulations, 2010 CFR

...wax (ozocerite) Cetyl alcohol Chloracetamide Chloral hydrate Chlorinated liquid n- paraffins with chain lengths of...5-di-tert- butyl-4-hydroxy-hydro-cinnamate)] methane a [p- (1,1,3,3-Tetramethylbutyl)...

2009-04-01

435

21 CFR 175.105 - Adhesives.  

Code of Federal Regulations, 2010 CFR

...wax (ozocerite) Cetyl alcohol Chloracetamide Chloral hydrate Chlorinated liquid n- paraffins with chain lengths of...5-di-tert- butyl-4-hydroxy-hydro-cinnamate)] methane a [p- (1,1,3,3-Tetramethylbutyl)...

2010-01-01

436

7 CFR 1.75 - General stipulations.  

Code of Federal Regulations, 2013 CFR

...the literary property concerned. (b) The producer must show access to a distribution channel recognized by the motion picture or television industry. In lieu of complete distribution plans for a television series, a producer must...

2013-01-01

437

2 CFR 175.15 - Award term.  

Code of Federal Regulations, 2013 CFR

... (a) To implement the trafficking in persons requirement in...this section, is: I. Trafficking in persons. a. Provisions...Engage in severe forms of trafficking in persons during the period...terminate this award, without penalty, if you or a subrecipient...

2013-01-01

438

40 CFR 763.175 - Enforcement.  

Code of Federal Regulations, 2013 CFR

...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...

2013-07-01

439

175Hp Contrarotating Homopolar Motor Design Report.  

National Technical Information Service (NTIS)

A normally conducting contrarotating homopolar motor has been designed and constructed. The reaction torque, in the outer rotor, from the inner rotor is utilized to produce true contrarotation. The machine utilizes liquid cooled conductors, high performan...

M. J. Cannell J. L. Drake R. A. McConnell W. R. Martino

1994-01-01

440

33 CFR 175.23 - Serviceable condition.  

Code of Federal Regulations, 2013 CFR

...that has become hardened, non-resilient, permanently compressed, waterlogged, oil-soaked, or which shows evidence of fungus or mildew; or (3) Loss of buoyant material or buoyant material that is not securely held in position. (c) In...

2013-07-01

441

7 CFR 65.175 - Ground pork.  

Code of Federal Regulations, 2013 CFR

...MARKETING ACT OF 1946 AND THE EGG PRODUCTS INSPECTION ACT (CONTINUED) COUNTRY OF ORIGIN LABELING OF BEEF, PORK, LAMB, CHICKEN, GOAT MEAT, PERISHABLE AGRICULTURAL COMMODITIES, MACADAMIA NUTS, PECANS, PEANUTS, AND GINSENG General Provisions...

2013-01-01

442

21 CFR 558.175 - Clopidol.  

Code of Federal Regulations, 2013 CFR

...Limitations Sponsor (1) 113.5 Broiler chickens and re-placement chickens intended for use as caged layers: As an aid...brunetti, and E. mivati Do not feed to chickens over 16 weeks of age 016592 (2)...

2013-04-01

443

Magnetic field effect on Fe-induced short-range magnetic correlation and electrical conductivity in Bi1.75Pb0.35Sr1.90Cu0.91Fe0.09O6+y  

SciTech Connect

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.

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

444

Linear, non-linear optical susceptibilities and the hyperpolarizability of the mixed crystals Ag0.5Pb1.75Ge(S1-xSex)4: experiment and theory.  

PubMed

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 ?(?) 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

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

2013-10-16

445

Southwest Ice Cream Specialties Conducts Voluntary Recall of ShurFine Brand Creamery Select Premium Ice Cream Dulce de Leche 1.75 Quarts Ice Cream Because Package May Contain Praline Pecan Ice Cream Which May Contain Undeclared Allergens (Wheat, Soy an  

NASA Website

Southwest Ice Cream Specialties is voluntarily recalling ShurFine Brand Creamery Select (Premium Ice Cream) Dulce de Leche Ice Cream (1.75 quarts, 1.66L) because it may contain praline pecan ice cream, which contains wheat, soy and ...

446

All five host-range variants of Xanthomonas citri carry one pthA homolog with 17.5 repeats that determines pathogenicity on citrus, but none determine host-range variation.  

PubMed

Citrus canker disease is caused by five groups of Xanthomonas citri strains that are distinguished primarily by host range: three from Asia (A, A*, and A(w)) and two that form a phylogenetically distinct clade and originated in South America (B and C). Every X. citri strain carries multiple DNA fragments that hybridize with pthA, which is essential for the pathogenicity of wide-host-range X. citri group A strain 3213. DNA fragments that hybridized with pthA were cloned from a representative strain from all five groups. Each strain carried one and only one pthA homolog that functionally complemented a knockout mutation of pthA in 3213. Every complementing homolog was of identical size to pthA and carried 17.5 nearly identical, direct tandem repeats, including three new genes from narrow-host-range groups C (pthC), A(w) (pthAW), and A* (pthA*). Every noncomplementing paralog was of a different size; one of these was sequenced from group A* (pthA*-2) and was found to have an intact promoter and full-length reading frame but with 15.5 repeats. None of the complementing homologs nor any of the noncomplementing paralogs conferred avirulence to 3213 on grapefruit or suppressed avirulence of a group A* strain on grapefruit. A knockout mutation of pthC in a group C strain resulted in loss of pathogenicity on lime, but the strain was unaffected in ability to elicit an HR on grapefruit. This pthC- mutant was fully complemented by pthA, pthB, or pthC. Analysis of the predicted amino-acid sequences of all functional pthA homologs and nonfunctional paralogs indicated that the specific sequence of the 17th repeat may be essential for pathogenicity of X. citri on citrus. PMID:17722697

Al-Saadi, Abdulwahid; Reddy, Joseph D; Duan, Yong P; Brunings, Asha M; Yuan, Qiaoping; Gabriel, Dean W

2007-08-01

447

Thermochromic La{sub 1-x}Sr{sub x}MnO{sub 3} (x=0.1, 0.175, and 0.3) smart coatings grown by reactive pulsed laser deposition  

SciTech Connect

Thermochromic La{sub 1-x}Sr{sub x}MnO{sub 3} (x=0.1, 0.175, and 0.3) (LSMO) smart coatings were synthesized on (100) silicon and (0001) sapphire substrates by means of reactive pulsed laser deposition process at relatively low substrate temperature (500 deg. C) and without postannealing. X-ray diffraction patterns indicated that all deposited LSMO films have polycrystalline structures. The energy dispersive x-ray spectroscopy analysis indicated approximately the same La/Sr ratio in the formed LSMO coatings as in their corresponding targets. While, the x-ray photoelectron spectroscopy analysis of the LSMO/sapphire revealed that the strontium segregate at the film surface. The thermochromism of LSMO coatings was investigated by measuring their infrared reflectance as a function of temperature (up to 160 deg. C). It was observed that the reflectance decreased as the temperature increased. Reflectance switching of about 25% was achieved in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/Si at a wavelength of 5 {mu}m. The sheet electrical resistivity as a function of temperature (up to 130 deg. C) of LSMO/sapphire was investigated by means of the standard four-point probe technique. The resistivity decreased with increasing the temperature and no metallic-to-insulator transition was observed. However, it is found that the resistivity is very sensitive to the concentration level of Sr dopant: the resistivity decreased as the concentration of Sr increased. In addition, at room temperature, a higher temperature coefficient of resistance of -2.30%/ deg. C was achieved in La{sub 0.9}Sr{sub 0.1}MnO{sub 3} thin films. Finally, these LSMO smart coatings are promising materials for optical switching and IR uncooled bolometer devices.

Soltani, M.; Chaker, M.; Jiang, X.X.; Nikanpour, D.; Margot, J. [INRS-Energie, Materiaux et Telecommunications, 1650 Lionel Boulet, Varennes, Quebec J3X 1S2 (Canada); Canadian Space Agency, 6767 Route de l'Aeroport, Saint-Hubert, Quebec J3Y 8Y9 (Canada); Departement de Physique, Universite de Montreal, C. P. 6128, Succursale Centre-ville, Montreal, Quebec H3C 3J7 (Canada)

2006-07-15

448

Yb:YAG absorption at ambient and cryogenic temperatures  

Microsoft Academic Search

We have performed absorption measurements and generated absorption cross sections as a function of wavelength for the laser material YAG doped with ytterbium at 300, 175, and 75 K. This data was generated to enable a direct comparison of the absorption intensity and linewidths at room and cryogenic temperatures, and in particular near the temperature of liquid nitrogen at 77

David C. Brown; Rufus L. Cone; Yongchen Sun; Randy W. Equall

2005-01-01

449

Electronic spectroscopy of ytterbium in a neon matrix.  

PubMed

The low-lying electronic states of Yb isolated in a solid Ne matrix are characterized through absorption and emission spectroscopy. The absorption spectra of matrix isolated Yb while pumped into its triplet states have been recorded for the first time and the 6s6p (3)P(J) ? 5d6s (3)D(1, 2) transition frequencies obtained. Under matrix conditions, the structure of these states is found to be qualitatively the same as in the free atom, but the intersystem crossing rate is observed to be several orders of magnitude greater. A proposed explanation for this is curve crossings between the bound potential energy surface correlated to the 6s6p (1)P(1) state and the potential energy surfaces correlated to the 5d6s (3)D(1, 2) states in isolation. The potentials of the YbNe dimer in its lowest electronic states are computed ab initio and used in a pairwise cluster model to explicitly demonstrate these curve crossings. PMID:23206011

Lambo, R; Buchachenko, A A; Wu, L; Tan, Y; Wang, J; Sun, Y R; Liu, A-W; Hu, S-M

2012-11-28

450

Ytterbium-doped, dual-clad fiber amplifiers  

NASA Astrophysics Data System (ADS)

Rare-earth doped, dual-clad fiber devices are a potential means for generating very high power in the kilowatt range. Fiber lasers and amplifiers offer the advantages of high gain, easy thermal management, and guided mode propagation. However, the properties which make fiber advantageous also contribute to some drawbacks. Long fibers and high fields in single-mode cores provide high single pass gain. They also have high gain for non-linear processes. For a 50 m amplifier seeded with a narrow linewidth source, the SBS threshold is 1.2--1.8 W. For a 75 m amplifier, it is 0.9--1.3 W. The measured thresholds agree well with thresholds predicted by solving the coupled differential equations for pump, signal, and Stokes powers. The threshold follows a product law where the threshold power times the fiber length is a constant. The product law is theoretically investigated assuming a constant gain coefficient along the fiber. A large surface area to volume ratio closely couples the fiber to the external environment allowing waste heat to be removed. However, changes in the thermal environment of an active fiber device can seriously affect its operation. The wave-length of a 50 m fiber laser with broadband mirrors tunes at a rate of 0.2 nm/C. In addition, the slope efficiency decreases and the threshold increases at elevated temperatures. Such variability is a concern for devices intended for operation in wide variety of conditions. A fiber amplifier does not experience changes as dramatic as those of the laser. Stability is an issue for high-gain amplifiers. As the gain goes above a critical level, the fiber generates 100 ns pulses at a repetition rate of a 5--20 kHz. The pulses can cause catastrophic failure by shattering the end of the fiber. The critical gain has a strong dependence on feedback into the amplifier.

Brilliant, Nathan Andrew

2001-07-01

451

Measuring the Electron Electric Dipole Moment Using Ytterbium Fluoride Molecules  

NASA Astrophysics Data System (ADS)

It is well known that the existence of an electron electric dipole moment (eEDM) would violate time reversal symmetry. The Standard Model predicts an eEDM less than 10^{-38}e.cm, however many popular extensions predict values in the range 10^{-29}-10^{-24}e.cm. Our experiment currently has the potential to measure eEDMs down to approximately 10^{-29}e.cm, making it a precise probe for T-violation and physics beyond the Standard Model. We measure the eEDM by performing a type of separated oscillating field interferometry on a pulsed beam of YbF. The molecules are prepared such that the molecular spin is oriented perpendicular to an applied strong (10kV/cm) electric field. The spin is then allowed to precess about the electric field axis over a 0.5ms interaction period. We measure this angle of rotation, which is directly proportional to the eEDM. In order to measure the eEDM precisely and without error we use a complex switching technique wherein certain parameters, including the applied electric and magnetic fields, are reversed between individual molecular pulses. I will present our current technique and our most recent world leading result.

Smallman, I. J.; Devlin, J. A.; Kara, D. M.; Hudson, J. J.; Sauer, B. E.; Tarbutt, M. R.; Hinds, E. A.

2013-06-01

452

Heavy Fermion Scaling: Uranium versus Cerium and Ytterbium Compounds  

SciTech Connect

In an effort to explore the differences between rare-earth-based and uranium-based heavy fermion (HF) compounds that reflect the underlying difference between local 4f moments and itinerant 5f moments we analyze scaling laws that relate the low temperature neutron spectra of the primary ('Kondo-esque') spin fluctuation to the specific heat and susceptibility. While the scaling appears to work very well for the rare earth intermediate valence (IV) compounds, for a number of key uranium compounds the scaling laws fail badly. There are two main reasons for this failure. First, the presence of antiferromagnetic (AF) fluctuations, which contribute significantly to the specific heat, alters the scaling ratios. Second, the scaling laws require knowledge of the high temperature moment degeneracy, which is often undetermined for itinerant 5f electrons. By making plausible corrections for both effects, better scaling ratios are obtained for some uranium compounds. We point out that, while both the uranium HF compounds and the rare earth IV compounds have spin fluctuation characteristic energies of order 5-25 meV, they differ in that the AF fluctuations that are usually seen in the uranium compounds are never seen in the rare earth IV compounds. This suggests that the 5f itineracy increases the f-f exchange relative to the rare earth case.

Lawrence, J. M. [University of California, Irvine; Wang, Cuihuan [ORNL; Christianson, Andrew D [ORNL; Bauer, E. D. [Los Alamos National Laboratory (LANL)

2011-01-01

453

Heavy fermion scaling: uranium versus cerium and ytterbium compounds.  

PubMed

In an effort to explore the differences between rare-earth-based and uranium-based heavy fermion (HF) compounds that reflect the underlying difference between local 4f moments and itinerant 5f moments we analyze scaling laws that relate the low temperature neutron spectra of the primary ('Kondo-esque') spin fluctuation to the specific heat and susceptibility. While the scaling appears to work very well for the rare earth intermediate valence (IV) compounds, for a number of key uranium compounds the scaling laws fail badly. There are two main reasons for this failure. First, the presence of antiferromagnetic (AF) fluctuations, which contribute significantly to the specific heat, alters the scaling ratios. Second, the scaling laws require knowledge of the high temperature moment degeneracy, which is often undetermined for itinerant 5f electrons. By making plausible corrections for both effects, better scaling ratios are obtained for some uranium compounds. We point out that, while both the uranium HF compounds and the rare earth IV compounds have spin fluctuation characteristic energies of order 5-25meV, they differ in that the AF fluctuations that are usually seen in the uranium compounds are never seen in the rare earth IV compounds. This suggests that the 5f itineracy increases the f-f exchange relative to the rare earth case. PMID:21339563

Lawrence, J M; Wang, C H; Christianson, A D; Bauer, E D

2011-02-17

454

Ytterbium-doped borate fluoride laser crystals and lasers  

DOEpatents

A new class of solid state laser crystals and lasers are formed from Yb-doped borate fluoride host crystals. The general formula for the host crystals is MM{prime}(BO{sub 3})F, where M, M{prime} are monovalent, divalent aria trivalent metal cations. A particular embodiment of the invention is Yb-doped BaCaBO{sub 3}F (Yb:BCBF). BCBF and some of the related derivative crystals are capable of nonlinear frequency conversion, whereby the fundamental of the laser is converted to a longer or shorter wavelength. In this way, these new crystals can simultaneously serve as self-frequency doubling crystals and laser materials within the laser resonator. 6 figs.

Schaffers, K.I.; DeLoach, L.D.; Payne, S.A.; Keszler, D.A.

1997-10-14

455

Ytterbium-doped borate fluoride laser crystals and lasers  

DOEpatents

A new class of solid state laser crystals and lasers are formed from Yb-doped borate fluoride host crystals. The general formula for the host crystals is MM'(BO.sub.3)F, where M, M' are monovalent, divalent aria trivalent metal cations. A particular embodiment of the invention is Yb-doped BaCaBO.sub.3 F (Yb:BCBF). BCBF and some of the related derivative crystals are capable of nonlinear frequency conversion, whereby the fundamental of the laser is converted to a longer or shorter wavelength. In this way, these new crystals can simultaneously serve as self-frequency doubling crystals and laser materials within the laser resonator.

Schaffers, Kathleen I. (Pleasanton, CA); DeLoach, Laura D. (Manteca, CA); Payne, Stephen A. (Castro Valley, CA); Keszler, Douglas A. (Corvallis, OK)

1997-01-01

456

Glasslike thermal conductivity in ytterbium-doped lanthanum zirconate pyrochlore  

Microsoft Academic Search

Glass-like thermal conductivity is observed in (La1?xYbx)2Zr2O7 (1\\/6?x?1\\/3), which exhibits great potential as a high-temperature thermal barrier coating material. In the pyrochlore-type La2Zr2O7, the large 16c-site La3+ is weakly bonded by its surrounding 48f-site oxygen ions, and substitution of La3+ with smaller and heavier Yb3+ gives rise to a large atomic displacement parameter (ADP) of Yb3+ which behaves as a

Chunlei Wan; Wei Zhang; Yifeng Wang; Zhixue Qu; Aibing Du; Ruifen Wu; Wei Pan

2010-01-01

457

Experimental Investigation of Excited-State Lifetimes in Atomic Ytterbium  

SciTech Connect

Lifetimes of 21 excited states in atomic Yb were measured using time-resolved fluorescence detection following pulsed laser excitation. The lifetime of the 4f{sup 14}5d6s {sup 3}D{sub 1} state, which is of particular importance for a proposed study of parity nonconservation in atoms, was measured to be 380(30) ns.

Bowers, C.J.; Budker, D.; Commins, E.D.; DeMille, D.; Freedman, S.J.; Nguyen, A.-T.; Shang, S.-Q.; /UC, Berkeley; Zolotorev, M.; /SLAC

2011-11-15

458

Actively Q-switched ytterbium tapered fiber laser  

NASA Astrophysics Data System (ADS)

In this work, we have constructed an actively Q-switched T-DCF laser with an acousto-optic modulator (AOM). Actively Q-switched laser with T-DCF generated stable emission at 1065 nm over a wide repetition rate range of 0 Hz - 150 kHz, with the highest measured pulse energy of 1.6mJ limited by stimulated Brillouin scattering (SBS). We attribute the robust operation at low duty cycles to the intrinsically low amplified spontaneous emission (ASE), provided by the tapered fiber shape. In addition to the advantage of the large mode area at the output end of the fiber, the T-DCF provides several other attractive features. First, the vignetting of co-propagating ASE results in ASE power loss in wide-to-narrow end propagation. Second, the low-mode nature of counter-propagating spontaneous emission, arising from mode selection in the narrow part of the fiber, leads to weaker amplification of the spontaneous emission. These two effects contribute to the low ASE background. Finally, fiber diameter modulation is a known method for SBS suppression, and another inherent property of the T-DCF. These characteristics allowed for generation of 1.6mJ, 64 ns pulses at very low duty cycles, up to single shot operation, illustrating the potential of the T-DCF for high-energy pulse generation and amplification.

Filippov, Valery; Kerttula, Juho; Chamorovskii, Yuri; Golant, Konstantin; Okhotnikov, Oleg G.

2011-02-01

459

Measuring photodarkening from single-mode ytterbium doped silica fibers  

NASA Astrophysics Data System (ADS)

Photodarkening is recognized as a potentially important limiting factor on the lifetime and reliability of many Yb-doped fiber lasers and amplifiers. In particular, a photodarkening process attributed to the formation of photoinduced structural transformations can induce excess loss in the doped glass core of the fiber, resulting in reduced output power efficiency. Yet, quantifiable measurement techniques of this phenomenon have been scarce in the literature to date. Here we present a fast, simple and repeatable method to measure and compare the photodarkening rate caused by the formation of photoinduced structural transformations from Yb-doped single-mode fibers. The method relies on quantifying observations of transmission changes at visible wavelengths as an indicative measure of photodarkening at the signal wavelengths. Preliminary measurement results are presented supporting the utility of the technique for benchmarking the photodarkening behavior of different Yb-doped fibers.

Koponen, Joona J.; Sderlund, Mikko J.; Hoffman, Hanna J.; Tammela, Simo K. T.

2006-11-01

460

Spectroscopic Properties of Solid Solutions of Erbium and Ytterbium Oxides.  

National Technical Information Service (NTIS)

Solid solutions of Er2O3 and Yb2O3 were prepared over the entire composition range. The visible and ultraviolet diffuse reflectance spectra, the magnetic susceptibility, and the lattice parameters of these solutions were determined. An unusual competition...

L. Gruss R. E. Salomon

1970-01-01

461

Using ytterbium-169 for safe and economical industrial radiography.  

National Technical Information Service (NTIS)

Safety has become an issue of paramount importance for industrial radiography. Many NDE facilities and suppliers are finding the cost of performing radiography Prohibitive due to heightened safety concerns for radiation area protection. The most common so...

J. A. Dowalo

1994-01-01

462

All fiber ytterbium-doped fiber grating laser  

NASA Astrophysics Data System (ADS)

Based on requirement of all fiber structure, all fiber Yb-doped fiber grating laser uses double cladding fiber with Yb-doped as gain medium, uses fiber grating as resonance cavity and employs semiconductor laser as pumping source to realize the lasing based on the reverse of Yb ion. We use Bragg fiber grating as the resonance cavity of fiber laser and 970nm LD as pumping source, pump the Yb-doped double cladding fiber with circular inner-cladding. We realized 7.5W single-mode laser output, central wavelength of 1080nm, FWHM of 0.11nm under the pump power of 11.8W. Maxim conversion efficiency is 63.5% and slope efficiency of 46.4%.

Zhang, Liang; Qin, Li; Zhang, Jian; Ning, Yong-Qiang; Wang, Lijun

2005-01-01

463

Longitudinally diode-pumped ytterbium-erbium glass minilaser  

SciTech Connect

The prototype of a passively Q-switched, longitudinally diode-pumped erbium glass laser is fabricated. A slope efficiency of 38% is achieved in the free-running lasing regime. It is shown that a pump energy of only 42 mJ is required to generate a 9-ns, 1.8-mJ output pulse with efficiency 4.2%. (lasers)

Byshevskaya-Konopko, Lyudmila O; Vorob'ev, Igor' L; Izyneev, A A; Sadovskii, Pavel I [Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow Region (Russian Federation)

2004-09-30

464

Microstructural properties of K0.8 Fe1.6 S2, K0.8 Fe1.75 Se2-y Sy(0 ? y ? 2) and K0.8 Fe1.5+x S2(0 < x ? 0.5) single crystals  

NASA Astrophysics Data System (ADS)

The structural features of the antiferromagnetic K0.8Fe1.6S2 have been studied in the temperature range from 300 K up to 700 K by means of in situ transmission electron microscopy (TEM). The superstructure with a wave vector \\textbf{q}_{1}=1/5(3\\textbf{a}^*+\\textbf{b}^*) originating from a Fe-vacancy order has been clearly observed; moreover, the structural analysis shows that K0.8Fe1.6S2 undergoes a transition from the Fe-vacancy order to disorder at about 585 K. The S substitution effect on the phase separation and superconductivity in the K0.8Fe1.75Se2-ySy materials has been systematically investigated by SEM and TEM structural analyses, as well as by electrical resistivity measurements. Our experimental results reveal that the S element adopts a homogeneous distribution in all investigated materials, and the essential phase-separation nature is very similar to what was observed in the K0.8Fe1.75Se2 superconductor. A phase-separated state formed by the coexistence of two Fe-vacancy orders with wave vectors \\textbf{q}_{1}=1/5(3\\textbf{a}^*+\\textbf{b}^*) and \\textbf{q}_{3}=1/4(3\\textbf{a}^*+\\textbf{b}^*) in K0.8Fe1.5+xS2 (0 < x < 0.1) has been briefly discussed.

Cai, Y.; Wang, Z.; Wang, Z. W.; Sun, Z. A.; Yang, H. X.; Tian, H. F.; Ma, C.; Zhang, B.; Li, J. Q.

2013-08-01

465

Ytterbium and trace element distribution in brain and organic tissues of offspring rats after prenatal and postnatal exposure to ytterbium  

Microsoft Academic Search

Lanthanides, because of their diversified physical and chemical effects, have been widely used in a number of fields. As a\\u000a result, more and more lanthanides are entering the environment and eventually accumulating in the human body. Previous studies\\u000a indicate that the impact of lanthanides on brain function cannot be neglected. Although neurological studies of trace elements\\u000a are of paramount importance,

Liuxing Feng; Xiao He; Haiqing Xiao; Zijie Li; Fuliang Li; Nianqing Liu; Zhifang Chai; Yuliang Zhao; Zhiyong Zhang

2007-01-01

466

14 CFR 406.175 - Appeal from initial decision.  

Code of Federal Regulations, 2013 CFR

...made in accordance with applicable law, precedent, and public policy; and (3) Whether...and order of the FAA decisionmaker is precedent in any other civil penalty action under...appealed to the FAA decisionmaker is not precedent in any other civil penalty...

2013-01-01

467

46 CFR 175.600 - Incorporation by reference.  

Code of Federal Regulations, 2010 CFR

...Electric Booster and Commercial Storage Tank Water Heaters (UL 1453) 182.320. UL 1570-1995Fluorescent Lighting Fixtures (UL 1570) 183.410. UL 1571-1995Incandescent Lighting Fixtures (UL 1571)...

2009-10-01

468

46 CFR 175.600 - Incorporation by reference.  

Code of Federal Regulations, 2010 CFR

...Electric Booster and Commercial Storage Tank Water Heaters (UL 1453) 182.320. UL 1570-1995Fluorescent Lighting Fixtures (UL 1570) 183.410. UL 1571-1995Incandescent Lighting Fixtures (UL 1571)...

2010-10-01

469

14 CFR 91.175 - Takeoff and landing under IFR.  

Code of Federal Regulations, 2010 CFR

...relative positions and elevation) through the use of imaging sensors, such as a forward-looking infrared, millimeter wave radiometry, millimeter wave radar, and low-light level image intensifying; (2) The EFVS sensor imagery and...

2009-01-01

470

14 CFR 91.175 - Takeoff and landing under IFR.  

Code of Federal Regulations, 2010 CFR

...relative positions and elevation) through the use of imaging sensors, such as a forward-looking infrared, millimeter wave radiometry, millimeter wave radar, and low-light level image intensifying; (2) The EFVS sensor imagery and...

2010-01-01

471

40 CFR 152.175 - Pesticides classified for restricted use.  

Code of Federal Regulations, 2010 CFR

...concentrations of 0.025 pct paraquat dichloride and 0.03 percent atrazine; 0.03 pct paraquat dichloride and 0.37 pct atrazine, 0.04 pct paraquat dichloride and 0.49 pct atrazine All uses Unclassified Phorate Liquid formulations...

2010-07-01

472

40 CFR 152.175 - Pesticides classified for restricted use.  

Code of Federal Regulations, 2010 CFR

...concentrations of 0.025 pct paraquat dichloride and 0.03 percent atrazine; 0.03 pct paraquat dichloride and 0.37 pct atrazine, 0.04 pct paraquat dichloride and 0.49 pct atrazine All uses Unclassified Phorate Liquid formulations...

2009-07-01

473

26 CFR 1.175-5 - Percentage limitation and carryover.  

Code of Federal Regulations, 2013 CFR

... The amount of soil and water conservation expenditures which the taxpayer...expenditures are made for soil or water conservation or for the prevention...If a deduction for soil or water conservation expenditures has been...

2013-04-01

474

14 CFR 25.175 - Demonstration of static longitudinal stability.  

Code of Federal Regulations, 2013 CFR

...TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES...Climb. The stick force curve must have a stable slope at...high speed, the stick force curve must have a stable slope...low speed, the stick force curve must have a stable...

2013-01-01

475

14 CFR 23.175 - Demonstration of static longitudinal stability.  

Code of Federal Regulations, 2013 CFR

...TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC...Climb. The stick force curve must have a stable slope at...airplanes, the stick force curve must have a stable slope...airplanes, the stick force curve must have a stable slope...

2013-01-01

476

40 CFR 152.175 - Pesticides classified for restricted use.  

Code of Federal Regulations, 2013 CFR

... ......do Residue effects on avian species. Hazard to...Acute dermal toxicity. Residue effects on mammalian and avian species...formulations 14% and above Indoor (greenhouse) ......do Acute...cranberries ......do Effects on aquatic organisms....

2013-07-01

477

40 CFR 141.175 - Reporting and recordkeeping requirements.  

Code of Federal Regulations, 2010 CFR

...treatment or direct filtration, or which exceed the maximum level set by the State under § 141.173(b). (b...representative samples of filtered water exceeds the maximum level set by the State under § 141.173(b) for filtration...

2010-07-01

478

40 CFR 141.175 - Reporting and recordkeeping requirements.  

Code of Federal Regulations, 2010 CFR

...treatment or direct filtration, or which exceed the maximum level set by the State under Sec. 141.173(b). (b) Systems...representative samples of filtered water exceeds the maximum level set by the State under Sec. 141.173(b) for...

2009-07-01

479

37 CFR 1.75 - Claim(s).  

Code of Federal Regulations, 2013 CFR

...the applicant regards as his invention or discovery. (b) More...claims must conform to the invention as set forth in the remainder...146 as to claiming different inventions in one application. (e...applicant considers as the new or improved portion....

2013-07-01

480

40 CFR 180.175 - Maleic hydrazide; tolerances for residues.  

Code of Federal Regulations, 2013 CFR

...TOLERANCES AND EXEMPTIONS FOR PESTICIDE CHEMICAL RESIDUES IN FOOD Specific Tolerances § 180...0 Potato 50.0 (2) A food additive known as maleic hydrazide...following conditions: (i) The food additive is present as a...

2013-07-01

481

46 CFR 175.600 - Incorporation by reference.  

Code of Federal Regulations, 2012 CFR

...23, 1994Household Electric Storage Tank Heaters (UL 174) 182...1102-1992Non integral Marine Fuel Tanks (UL 1102) 182.440...Electric Booster and Commercial Storage Tank Water Heaters (UL 1453)...

2012-10-01

482

46 CFR 175.600 - Incorporation by reference.  

Code of Federal Regulations, 2011 CFR

...23, 1994Household Electric Storage Tank Heaters (UL 174) 182...1102-1992Non integral Marine Fuel Tanks (UL 1102) 182.440...Electric Booster and Commercial Storage Tank Water Heaters (UL 1453)...

2011-10-01

483

21 CFR 161.175 - Frozen raw breaded shrimp.  

Code of Federal Regulations, 2013 CFR

...rounded tip. (vii) Nut picker. (viii) Thermometer (immersion type) accurate to ±2 °F. (ix) Copper sulfate crystals (CuSo4 ·5H2 O). (2) Procedure. (i) Weigh all composite units in the sample while they are still hard...

2013-04-01

484

33 CFR 175.130 - Visual distress signals accepted.  

Code of Federal Regulations, 2013 CFR

...held red flares (160.021), and one parachute red flare (160.024 or 160.036...Signals Day Only 3 160.024 Parachute Red Flare Distress Signals Day and...036 Hand-Held Rocket-Propelled Parachute Red Flare Distress Signals Day...

2013-07-01

485

21 CFR 175.270 - Poly(vinyl fluoride) resins.  

Code of Federal Regulations, 2010 CFR

...federal_register/code_of_federal_regulations/ibr_locations.html. (1) Solvent. N,N- Dimethylacetamide, technical grade. (2) Solution. Powdered resin and solvent are heated at 120 °C until the resin is...

2009-04-01

486

29 CFR 1952.175 - Changes to approved plans.  

Code of Federal Regulations, 2010 CFR

...approved by the Assistant Secretary on March 6, 1978. (b) On January 1, 1978, the California Department of Industrial Relations became the agency designated to administer the California Occupational Safety and Health Plan. (c)...

2010-07-01

487

21 CFR 175.210 - Acrylate ester copolymer coating.  

Code of Federal Regulations, 2010 CFR

...preservative in emulsion defoamer. Disodium hydrogen phosphate Do. Formaldehyde Glyceryl monostearate Methyl cellulose Mineral oil Paraffin wax Potassium hydroxide Potassium persulfate Tallow Tetrasodium pyrophosphate...

2000-04-01

488

21 CFR 175.210 - Acrylate ester copolymer coating.  

Code of Federal Regulations, 2010 CFR

...preservative in emulsion defoamer. Disodium hydrogen phosphate Do. Formaldehyde Glyceryl monostearate Methyl cellulose Mineral oil Paraffin wax Potassium hydroxide Potassium persulfate Tallow Tetrasodium pyrophosphate...

2012-04-01

489

21 CFR 175.210 - Acrylate ester copolymer coating.  

Code of Federal Regulations, 2010 CFR

...preservative in emulsion defoamer. Disodium hydrogen phosphate Do. Formaldehyde Glyceryl monostearate Methyl cellulose Mineral oil Paraffin wax Potassium hydroxide Potassium persulfate Tallow Tetrasodium pyrophosphate...

2011-04-01

490

34 CFR 668.175 - Alternative standards and requirements.  

Code of Federal Regulations, 2013 CFR

...that seeks to participate for the first time in the title IV, HEA programs...disbursements to eligible students and parents under either the cash monitoring or...compliance audits earlier than the time specified under §...

2013-07-01

491

21 CFR 175.270 - Poly(vinyl fluoride) resins.  

Code of Federal Regulations, 2010 CFR

...fluoride) resins consist of basic resins produced by the polymerization of...The poly(vinyl fluoride) basic resins have an intrinsic viscosity...technical grade. (2) Solution. Powdered resin and solvent are heated at...

2010-01-01

492

46 CFR 172.175 - Character of damage.  

Code of Federal Regulations, 2010 CFR

...type IG hull is required, design calculations must show that the vessel can survive damage at any location. (b) If a type IIG hull is required, design calculations must show that a vessel (1) Longer than 492 feet (150 meters) in length can...

2010-10-01

493

46 CFR 172.175 - Character of damage.  

Code of Federal Regulations, 2010 CFR

...type IG hull is required, design calculations must show that the vessel can survive damage at any location. (b) If a type IIG hull is required, design calculations must show that a vessel (1) Longer than 492 feet (150 meters) in length can...

2009-10-01

494

21 CFR 175.300 - Resinous and polymeric coatings.  

Code of Federal Regulations, 2010 CFR

... Styrene. Vinyl toluene. (xv) Vinyl resinous substance, as the basic polymers: Polyvinyl acetate. Polyvinyl alcohol. Polyvinyl butyral. Polyvinyl chloride. Polyvinyl formal. Polyvinylidene chloride....

2009-04-01

495

21 CFR 175.300 - Resinous and polymeric coatings.  

Code of Federal Regulations, 2010 CFR

... Styrene. Vinyl toluene. (xv) Vinyl resinous substance, as the basic polymers: Polyvinyl acetate. Polyvinyl alcohol. Polyvinyl butyral. Polyvinyl chloride. Polyvinyl formal. Polyvinylidene chloride....

2010-01-01

496

21 CFR 175.300 - Resinous and polymeric coatings.  

Code of Federal Regulations, 2013 CFR

... Styrene. Vinyl toluene. (xv) Vinyl resinous substance, as the basic polymers: Polyvinyl acetate. Polyvinyl alcohol. Polyvinyl butyral. Polyvinyl chloride. Polyvinyl formal. Polyvinylidene chloride....

2013-04-01

497

29 CFR 102.175 - Agency review of the obligation.  

Code of Federal Regulations, 2013 CFR

... Agency review of the obligation. 102...Relating to Labor NATIONAL LABOR RELATIONS BOARD...REGULATIONS, SERIES 8 Debt Collection Procedures... Agency review of the obligation. (a...for collection of the debt will consider...

2013-07-01

498

50 CFR 216.175 - Requirements for monitoring and reporting.  

Code of Federal Regulations, 2010 CFR

...Comprehensive Monitoring Plan (ICMP) in 2009. This planning and adaptive management tool shall include: (1) A method for prioritizing monitoring projects that clearly describes the characteristics of a proposal that factor into its priority. (2)...

2009-10-01

499

47 CFR 90.175 - Frequency coordinator requirements.  

Code of Federal Regulations, 2011 CFR

...necessary to identify and recommend the most appropriate frequency. Additionally, applicants bear the burden of proceeding and the burden of proof in requesting the Commission to overturn a coordinator's recommendation. (b) For...

2011-10-01

500