Sample records for ytterbium 175

  1. Surface trap for ytterbium ions

    E-print Network

    Campbell, Jonathan A. (Jonathan Alan)

    2006-01-01

    We conducted an experiment to load a shallow planar ion trap from a cold atom source of Ytterbium using photoionization. The surface trap consisted of a three-rod radio frequency Paul trap fabricated using standard printed ...

  2. Aggregates of iron in ytterbium films

    Microsoft Academic Search

    W. T. Herrera; C. Rojas-Ayala; I. S. Dinóla; E. C. Passamani; M. Kraken; J. Engelke; E. Baggio-Saitovitch; F. J. Litterst

    Films of ytterbium doped with iron (0.3–1.6 at.% Fe) have been prepared by co-deposition of atomic beams of the elements onto\\u000a Kapton substrates under high vacuum. Iron is immiscible in ytterbium and various iron species are expected to occur. XRD reveals\\u000a a mixture of fcc and hcp ytterbium. The Mössbauer spectra are interpreted with contributions from monomeric iron on interstitial\\u000a sites,

  3. Temperature sensitivity of ytterbium fiber amplifiers

    Microsoft Academic Search

    Xiang Peng; Liang Dong

    2008-01-01

    We demonstrated a method of characterizing temperature sensitivity of ytterbium-doped fiber amplifiers based on deriving Stark parameters from measured emission and absorption spectra. Temperature sensitivity is found to be mainly determined by Pout\\/Ppump, when Pout\\/Ppump>0.4.

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

    E-print Network

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

    2014-12-02

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

  5. Bi2O3-based Ytterbium doped fiber laser

    Microsoft Academic Search

    Seiki Ohara; Yutaka Kuroiwa

    2009-01-01

    Ytterbium doped Bi2O3-based glasses have been developed. The absorbance is as high as 2600 dB\\/m\\/mol. Maximum absorption of 7800 dB\\/m is achieved. Bi2O3-based Ytterbium doped fiber is fabricated, and demonstrated fiber lasers using newly developed fibers.

  6. Laser cooling and trapping of atomic ytterbium

    Microsoft Academic Search

    Thomas Howard Loftus

    2001-01-01

    This dissertation reports an experimental study of laser cooled and magneto-optically trapped atomic Ytterbium (Yb). Studies focus on cooling Yb by driving the strong 398.9 nm (6s2)1 S0-(6s6p) 1P1 transition and probing the resulting cold samples by weakly exciting the spectrally narrow 555.8 nm (6 s2)1S0-(6 s6p)3P1 transition. Apparatus required for these experiments, including a 398.9 nm laser system, a

  7. Experiments in the Ultracold Lithium - Ytterbium System

    NASA Astrophysics Data System (ADS)

    Khramov, Alexander

    I detail the construction of an experimental apparatus created for performing ultracold atomic experiments with fermionic lithium-6 (Li) and several isotopes of ytterbium (Yb), and several of the first experiments performed using this apparatus. The apparatus consists of a vacuum chamber, laser and auxiliary systems, which together are used to produce the first instance of trapped ultracold mixtures of lithium and ytterbium. We show that the system is stable and obtain the s-wave scattering properties of Li-Yb collisions. By using Yb to sympathetically cool Li, double quantum degeneracy is achieved. I demonstrate the versatility of the new system with several experiments. In the first, we investigate the behvaiour of Li near a broad Feshbach resonance, and modify it with Yb. In the second, we produce Yb in the metastable state, and trap it in a 1064 nm optical dipole trap, which allows for a technically simple spin polarization procedure. We then characterize the dynamics of a Li-metastable Yb mixture. The work described in this thesis provides a pathway to future extensions such as the magentic tuning of Li-Yb interactions and the production of LiYb molecules by either photo- or magnetoassociation. The potential interest of this specific system lies in the combination of alkali and spin-singlet atom, leading to a potential paramagnetic ground state molecule, and experimental realizations of systems which cannot be accessed with bialkali experiments.

  8. Analytical model of an ytterbium-erbium fiber saturating amplifier

    Microsoft Academic Search

    V. Yu. Golyshev

    2003-01-01

    The amplification of an optical signal in an erbium-and ytterbium-doped fiber saturation-mode amplifier is considered. Analytical\\u000a distributions of the inverse population, pump power, and signal intensity along an active light guide are derived. Spectral\\u000a dependences of the saturation power and amplification threshold are obtained for different mode sizes of the radiation and\\u000a ytterbium-to-erbium active ion ratios. The optimal active-fiber length

  9. Quantum Simulation of Magnetism with Ytterbium Ions

    NASA Astrophysics Data System (ADS)

    Chang, Ming-Shien; Kim, Kihwan; Korenblit, Simcha; Islam, Kazi; Monroe, Christopher

    2009-05-01

    An array of cold trapped ions has recently been identified as a promising physical implementation of a quantum simulator [1,2], thanks to the tunable long range couplings between ions and its advanced status on quantum computation applications. In particular, ions coupled by tightly bound transverse normal modes allows more efficient cooling and wide tunability of the effective spin-spin couplings. We will report our most recent simulation results of quantum spin Hamiltonians with few trapped ytterbium ions, coupled by transverse modes. We will also discuss on how this may be scaled up to a much larger number of spins with anharmonic traps and using multiple transverse modes. This work is supported by the DARPA OLE Program under ARO contract, IARPA under ARO contract, the NSF PIF Program, and the NSF Physics Frontier Center at JQI. [1] D. Porras and J. I. Cirac, Phys. Rev. Lett. 92, 207901 (2004) [2] A. Friedenauer et al., Nat. Phys. 4, 757 (2008)

  10. Optimal Design of Double-Clad Ytterbium-Doped Fiber Amplifiers Operating at 1020-1070

    E-print Network

    Wai, Ping-kong Alexander

    Optimal Design of Double-Clad Ytterbium-Doped Fiber Amplifiers Operating at 1020-1070 K. S. Tsang1 experimentally demonstrated a double- clad ytterbium-doped fiber amplifier operating at 1020 to 1070 nm. The measured gain is 27 dB and the gain variation is less than 2 dB. Keywords: fiber amplifier, ytterbium

  11. 33 CFR 175.135 - Existing equipment.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...equipment. Launchers manufactured before 1 January, 1981, which do not have approval numbers are acceptable for use with meteor or parachute signals listed in Table 175.130 under § 175.130 as long as they remain in serviceable condition....

  12. 33 CFR 175.135 - Existing equipment.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...equipment. Launchers manufactured before 1 January, 1981, which do not have approval numbers are acceptable for use with meteor or parachute signals listed in Table 175.130 under § 175.130 as long as they remain in serviceable condition....

  13. 33 CFR 175.135 - Existing equipment.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...equipment. Launchers manufactured before 1 January, 1981, which do not have approval numbers are acceptable for use with meteor or parachute signals listed in Table 175.130 under § 175.130 as long as they remain in serviceable condition....

  14. 33 CFR 175.135 - Existing equipment.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...equipment. Launchers manufactured before 1 January, 1981, which do not have approval numbers are acceptable for use with meteor or parachute signals listed in Table 175.130 under § 175.130 as long as they remain in serviceable condition....

  15. 33 CFR 175.135 - Existing equipment.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...equipment. Launchers manufactured before 1 January, 1981, which do not have approval numbers are acceptable for use with meteor or parachute signals listed in Table 175.130 under § 175.130 as long as they remain in serviceable condition....

  16. All-fibre ytterbium laser tunable within 45 nm

    SciTech Connect

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

    2007-12-31

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

  17. 33 CFR 117.175 - Mokelumne River.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Mokelumne River. 117.175 Section 117.175 Navigation... California § 117.175 Mokelumne River. (a) The draw of the California...Transportation highway bridge, the Mokelumne River Bridge, mile 3.0, at East...

  18. 33 CFR 117.175 - Mokelumne River.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  19. 33 CFR 117.175 - Mokelumne River.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  20. 50 CFR 17.5 - Alaska natives.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Alaska natives. 17.5 Section 17.5 ...Introduction and General Provisions § 17.5 Alaska natives. (a) The provisions...is an Alaskan native and who resides in Alaska; or (2) Any non-native...

  1. 50 CFR 17.5 - Alaska natives.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Alaska natives. 17.5 Section 17.5 ...Introduction and General Provisions § 17.5 Alaska natives. (a) The provisions...is an Alaskan native and who resides in Alaska; or (2) Any non-native...

  2. 50 CFR 17.5 - Alaska natives.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Alaska natives. 17.5 Section 17.5 ...Introduction and General Provisions § 17.5 Alaska natives. (a) The provisions...is an Alaskan native and who resides in Alaska; or (2) Any non-native...

  3. 50 CFR 17.5 - Alaska natives.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Alaska natives. 17.5 Section 17.5 ...Introduction and General Provisions § 17.5 Alaska natives. (a) The provisions...is an Alaskan native and who resides in Alaska; or (2) Any non-native...

  4. 50 CFR 17.5 - Alaska natives.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Alaska natives. 17.5 Section 17.5 ...Introduction and General Provisions § 17.5 Alaska natives. (a) The provisions...is an Alaskan native and who resides in Alaska; or (2) Any non-native...

  5. Ultrafast Ytterbium doped INNOSLAB amplifier with high average power

    Microsoft Academic Search

    T. Mans; P. Russbuldt; J. Weitenberg; G. Rotarius; D. Hoffmann; R. Poprawe

    2009-01-01

    A diode-pumped ytterbium doped INNOSLAB fs-amplifier with 400 W output power was realized. The pulse duration of the output pulses was almost transform limited 682 fs for Yb:YAG at a pulse repetition rate of 76 MHz. This was achieved at room temperature without the use of any stretcher or compressor setup.

  6. Toward IFE Oriented Laser Chains: Cryogenically Cooled Ytterbium Doped Materials

    Microsoft Academic Search

    G. Bourdet; O. Casagrande; V. Cardinali; N. Deguil-Robin; B. Le Garrec

    2009-01-01

    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 Yb3+ doped ceramics at cryogenic temperature. We also propose a solution for minimizing the ASE

  7. Gain analysis of Erbium and Ytterbium Doped Optical Fiber Amplifiers

    Microsoft Academic Search

    Tolga Kucukarslan; N. Ozlem Unverdi

    2012-01-01

    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,

  8. Neodymium, erbium, and ytterbium co-doped fiber amplifier

    Microsoft Academic Search

    Itai Ron; Amos A. Hardy

    2011-01-01

    A combination of erbium (Er), ytterbium (Yb), and neodymium (Nd), in fiber amplifiers, is examined. This combination extends the pumping wavelength spectrum by creating a new pumping path. Furthermore, the Nd addition enables pumping the amplifier from within the amplifier center, and thereby decreases the amplified spontaneous emission at the amplifier ends. A mathematical model is presented relating the excited

  9. Cathodoluminescence of boron nitride nanotubes doped by ytterbium

    Microsoft Academic Search

    Hua Chen; Ying Chen; Yun Liu

    2010-01-01

    Boron nitride nanotubes (BNNTs) are wide band gap semiconducting material with super thermal and chemical stabilities, which make them an ideal nano-sized host for luminescent ions. In this work, we report an in situ synthesis of Ytterbium (Yb) doped BNNTs using a ball milling and annealing approach. Yb doped BNNTs show more red-light emissions in the cathodoluminescent (CL) spectrum in

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

    E-print Network

    C. Fry; M. Thoennessen

    2012-05-26

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

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

    SciTech Connect

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

    2013-09-15

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

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

    E-print Network

    Fry, C

    2012-01-01

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

  13. Luminescence and photoinduced absorption in ytterbium-doped optical fibres

    Microsoft Academic Search

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

    2011-01-01

    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

  14. Ytterbium-doped glass waveguide laser fabricated by ion exchange

    Microsoft Academic Search

    Catalin Florea; Kim A. Winick

    1999-01-01

    A ytterbium-doped, glass, channel waveguide laser, fabricated by ion exchange, is reported. The 2.2 cm long device, using broad-band 4% output couplers, lased in the vicinity from 1020 to 1030 nm when pumped by a Ti:sapphire laser operating at 910 nm. A lasing threshold of 50 mW (launched pump) and a slope efficiency of 5% were measured. Device parameters, including

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

    Microsoft Academic Search

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

    2005-01-01

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

  16. Mode-Locked Ytterbium-Doped Fiber Lasers

    Microsoft Academic Search

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

    2008-01-01

    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

  17. OCEAN DRILLING PROGRAM LEG 175 PRELIMINARY REPORT

    E-print Network

    OCEAN DRILLING PROGRAM LEG 175 PRELIMINARY REPORT BENGUELA CURRENT Dr. Wolfgang Berger Co, Texas 77845-9547 U.S.A. __________________ Paul J. Fox Director of Science Operations ODP The following scientists were aboard the JOIDES Resolution for Leg 175 of the Ocean Drilling Program: Wolfgang

  18. Luminescence and photoinduced absorption in ytterbium-doped optical fibres

    NASA Astrophysics Data System (ADS)

    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

    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.

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

    E-print Network

    Pines, Alexander

    LBNL-42730 1 Collisional Perturbation of States in Atomic Ytterbium by Helium and Neon D in atomic ytterbium by helium and neon buffer gases are reported. We find upper limits for the quenching and neon. PACS numbers: 34, 11.30.Er, 42.62.Fi (Submitted to Phys. Rev. A) 1. INTRODUCTION The 6s2 1 S0 6s

  20. High power, continuous-wave ytterbium-doped fiber laser tunable from 976 to 1120 nm

    E-print Network

    Paris-Sud XI, Université de

    High power, continuous-wave ytterbium-doped fiber laser tunable from 976 to 1120 nm Romain Royon,1 Abstract: We report on a linearly-polarized, continuous-wave Ytterbium- doped fiber laser continuously to more than 1 nm at all wavelengths ©2013 Optical Society of America OCIS codes: (140.3510) Lasers, fiber

  1. Extractable energy from Ytterbium-doped and Ytterbium-erbium co-doped high-energy pulsed fiber amplifiers and lasers

    Microsoft Academic Search

    Yoav Sintov; Ori Katz; Yaakov Glick; Shai Acco; Yehuda Nafcha; Avraham Englander; Raphael Lavi

    2006-01-01

    An analytic model is developed for evaluating the extractable energy from high energy pulsed Ytterbium (Yb) doped and Ytterbium:Erbium (Yb:Er) co-doped fiber amplifiers and lasers. The energy extraction capabilities under the limitation of spurious lasing, due to amplified spontaneous emission (ASE), are mapped for various numerical apertures, single and multi transverse mode evolution and operating wavelengths. The calculation results of

  2. 25 CFR 175.10 - Revenues collected from power operations.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2011-04-01 true Revenues collected from power operations. 175.10 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees, Electric Power Rates and Revenues § 175.10...

  3. 25 CFR 175.10 - Revenues collected from power operations.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Revenues collected from power operations. 175.10 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees, Electric Power Rates and Revenues § 175.10...

  4. 25 CFR 175.10 - Revenues collected from power operations.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Revenues collected from power operations. 175.10 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees, Electric Power Rates and Revenues § 175.10...

  5. 25 CFR 175.10 - Revenues collected from power operations.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Revenues collected from power operations. 175.10 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees, Electric Power Rates and Revenues § 175.10...

  6. 25 CFR 175.10 - Revenues collected from power operations.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Revenues collected from power operations. 175.10 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees, Electric Power Rates and Revenues § 175.10...

  7. 40 CFR 61.175 - Monitoring requirements.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  8. 40 CFR 61.175 - Monitoring requirements.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  9. 40 CFR 61.175 - Monitoring requirements.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

  10. 40 CFR 61.175 - Monitoring requirements.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

  11. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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

  12. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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

  13. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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

  14. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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

  15. 43 CFR 17.5 - Compliance information.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  16. 33 CFR 175.201 - Ventilation.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01...Section 175.201 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...electrical generation, mechanical power, or propulsion unless it is equipped with an...

  17. 33 CFR 175.115 - Exceptions.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01...Section 175.115 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...completely open construction, not equipped with propulsion machinery, under 26? in...

  18. 33 CFR 175.201 - Ventilation.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01...Section 175.201 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...electrical generation, mechanical power, or propulsion unless it is equipped with an...

  19. 33 CFR 175.115 - Exceptions.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01...Section 175.115 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...completely open construction, not equipped with propulsion machinery, under 26? in...

  20. 33 CFR 175.115 - Exceptions.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01...Section 175.115 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...completely open construction, not equipped with propulsion machinery, under 26? in...

  1. 33 CFR 175.201 - Ventilation.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01...Section 175.201 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...electrical generation, mechanical power, or propulsion unless it is equipped with an...

  2. 33 CFR 175.201 - Ventilation.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01...Section 175.201 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...electrical generation, mechanical power, or propulsion unless it is equipped with an...

  3. 33 CFR 175.115 - Exceptions.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01...Section 175.115 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...completely open construction, not equipped with propulsion machinery, under 26? in...

  4. 33 CFR 175.115 - Exceptions.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01...Section 175.115 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...completely open construction, not equipped with propulsion machinery, under 26? in...

  5. 33 CFR 175.201 - Ventilation.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01...Section 175.201 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND...electrical generation, mechanical power, or propulsion unless it is equipped with an...

  6. 21 CFR 172.175 - Sodium nitrite.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD FOR HUMAN CONSUMPTION (CONTINUED) FOOD ADDITIVES PERMITTED FOR DIRECT ADDITION TO FOOD FOR HUMAN CONSUMPTION Food Preservatives § 172.175 Sodium nitrite. The food additive sodium nitrite may be safely used in or...

  7. 21 CFR 172.175 - Sodium nitrite.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...HEALTH AND HUMAN SERVICES (CONTINUED) FOOD ADDITIVES PERMITTED FOR DIRECT ADDITION TO FOOD FOR HUMAN CONSUMPTION Food Preservatives § 172.175 Sodium nitrite. The food additive sodium nitrite may be safely used in or...

  8. 21 CFR 172.175 - Sodium nitrite.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD FOR HUMAN CONSUMPTION (CONTINUED) FOOD ADDITIVES PERMITTED FOR DIRECT ADDITION TO FOOD FOR HUMAN CONSUMPTION Food Preservatives § 172.175 Sodium nitrite. The food additive sodium nitrite may be safely used in or...

  9. 21 CFR 172.175 - Sodium nitrite.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD FOR HUMAN CONSUMPTION (CONTINUED) FOOD ADDITIVES PERMITTED FOR DIRECT ADDITION TO FOOD FOR HUMAN CONSUMPTION Food Preservatives § 172.175 Sodium nitrite. The food additive sodium nitrite may be safely used in or...

  10. 21 CFR 172.175 - Sodium nitrite.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD FOR HUMAN CONSUMPTION (CONTINUED) FOOD ADDITIVES PERMITTED FOR DIRECT ADDITION TO FOOD FOR HUMAN CONSUMPTION Food Preservatives § 172.175 Sodium nitrite. The food additive sodium nitrite may be safely used in or...

  11. 7 CFR 1.75 - General stipulations.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...REGULATIONS Cooperative Production of Television Films § 1.75 General stipulations. In requesting...agreement will be reached upon story, script and film treatment with the Department before film production is...

  12. 7 CFR 1.75 - General stipulations.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...REGULATIONS Cooperative Production of Television Films § 1.75 General stipulations. In requesting...agreement will be reached upon story, script and film treatment with the Department before film production is...

  13. 7 CFR 1.75 - General stipulations.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...REGULATIONS Cooperative Production of Television Films § 1.75 General stipulations. In requesting...agreement will be reached upon story, script and film treatment with the Department before film production is...

  14. 7 CFR 1.75 - General stipulations.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...REGULATIONS Cooperative Production of Television Films § 1.75 General stipulations. In requesting...agreement will be reached upon story, script and film treatment with the Department before film production is...

  15. 7 CFR 1.75 - General stipulations.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...REGULATIONS Cooperative Production of Television Films § 1.75 General stipulations. In requesting...agreement will be reached upon story, script and film treatment with the Department before film production is...

  16. Luminescence and photoinduced absorption in ytterbium-doped optical fibres

    SciTech Connect

    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

    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.

  17. Ytterbium Clusters in Fluorite CaF{sub 2}

    SciTech Connect

    Nikiforov, Anatoliy E.; Chernyshev, Vladimir A.; Volodin, Vasiliy P. [Ural State University, 620083, Lenin av. 51, Ekaterinburg (Russian Federation); Avram, Nicolae M. [West University of Timisoara, 300223, Bd. Parvan No. 4, Timisoara (Romania); Academy of Romanian Scientist, Sp. Independentei Nr. 54, 050094 Bucharest (Romania); Avram, Calin N. [West University of Timisoara, 300223, Bd. Parvan No. 4, Timisoara (Romania)

    2009-05-22

    The crystal structure of the ytterbium hexameric cluster in CaF{sub 2} 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 Yb{sub 6}F{sub 36} hexameric cluster were calculated in the exchange charges model. Also, the optical spectra of Yb{sup 3+} single center in CaF{sub 2}(cubic and tetragonal symmetry) was calculated and discussed.

  18. Paramagnetic Faraday rotation with spin-polarized ytterbium atoms

    E-print Network

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

    2005-12-26

    We report observation of the 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 the 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.

  19. Q-switched distributed-Bragg-reflector ytterbium laser

    NASA Astrophysics Data System (ADS)

    Ouslimani, H.; Bastard, L.; Broquin, J.-E.

    2013-03-01

    A passively Q-switched distributed-Bragg-reflector laser made in glass integrated optics technology, and operating around 1030 nm, is designed, realized and investigated. The laser is formed by an ion-exchanged single mode waveguide realized in an Ytterbium doped phosphate glass. The Q-switching behavior is obtained by hybridizing a saturable absorber film on the waveguides. This allows the realization of a short and simple laser cavity having both pulsed and a narrow linewidth emission. Its experimental characterization leads to the observation of a stable repetition rate of 12.5 kHz and a stable pulse duration of 9.2 ns FWHM.

  20. Atomic Mass and Nuclear Binding Energy for Yb-148 (Ytterbium)

    NASA Astrophysics Data System (ADS)

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

    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-Börnstein - 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-148 (Ytterbium, atomic number Z = 70, mass number A = 148).

  1. The Spectroscopy of YTTERBIUM-164 and the Loss of Collectivity at High-Spins in Even-Even Ytterbium Isotopes

    NASA Astrophysics Data System (ADS)

    Xie, Hong

    High spin states in ^{164 }Yb were populated via ^{124 }Sn(^{44}Ca, 4n)^{164}Yb reaction at the 25 MV Tandem Accelerator at the Holifield Heavy Ion Research Facility. Three new transitions were added to the previously known decay sequences of ^{164} Yb. The extracted B(E1, I to I - 1)/B(E2, I to I - 2) ratios for ^{164}Yb show an enhancement compared to its neighboring isotopes, which suggests that ^{164}Yb neutron number N = 94 possess an instability with respect to the octupole degree of freedom. Lifetimes of high spin states with I^ pi = 20^+ to 32 ^+ in the yrast band and 23^ - to 25^- in the ( -,1)-band in ^{164}Yb were measured by using the Doppler shift attenuation method. A reduction of the stretched E2 transition quadrupole moments was observed at high spins in the yrast decay sequencies. A systematic summary of the available experimental lifetime data and kinetic moments of inertia has been given for even-even ytterbium isotopes. The loss of collectivity implies that at high rotational frequency, nuclei undergo shape changes (mainly toward a reduced beta _2 deformation for well deformed ytterbium isotopes), which can be understood as arising from the deoccupation of strongly shape-polarizing, high-j, antialigned orbits with nucleons moving opposite to the rotation axis. The self-consistent cranking calculations, the so-called total routhian surface calculations, were performed for several ytterbium isotopes. Qualitatively the drops observed in transition quadrupole moments at high spin states in the yrast band are reproduced when the reduction of the pair correlation with increasing rotational frequency is taken into account. Both the data and the calculations show the expected neutron number dependence (a less sharp decrease in the collectivity at higher rotational frequency with increasing neutron number), but the detailed agreement is not satisfactory. In particular, the loss of collectivity occurs much lower in ^{160}Yb and ^{162}Yb than predicted.

  2. Passively Q-switched Ytterbium and Chromium all-fibre laser

    E-print Network

    Dussardier, Bernard; Peterka, Pavel

    2012-01-01

    A chromium-doped saturable absorber fibre stabilizes an otherwise spontaneously chaotic ytterbium- doped fibre laser. This original passively Q-switched all-fibre laser produces sustained and stable trains of smooth pulses at high repetition rate.

  3. Photonic bandgap single-mode optical fibre with ytterbium-doped silica glass core

    SciTech Connect

    Egorova, O N; Semenov, S L; Vel'miskin, V V; Dianov, Evgenii M [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation); Salganskii, M Yu; Yashkov, M V; Gur'yanov, Aleksei N [Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhnii Novgorod (Russian Federation)

    2011-01-24

    A photonic bandgap fibre with an ytterbium-doped silica glass core is fabricated and investigated. The possibility of implementing single-mode operation of such fibres in a wide spectral range at a large (above 20 {mu}m) mode field diameter makes them promising for fibre lasers and amplifiers. To ensure a high quality of the beam emerging from the fibre, particular attention is paid to increasing the optical homogeneity of the ytterbium-doped core glass. (optical fibres)

  4. Operation principles and numerical analysis of double-cladding erbium-ytterbium-codoped optical fiber amplifiers

    Microsoft Academic Search

    Shufu Dong; Shanghong Zhao; Shengbao Zhan; Guijin Xia; Guofu Chen

    2002-01-01

    The increasing capacity of wavelength-division multiplexing (WDM) transmissions systems requires higher output power of erbium doped fiber amplifiers (EDFAs). The two improvements are the use of double cladding fibers (DCF) and the addition of ytterbium oxide as co-dopant in the glass base. In this paper, the operation principles of double-cladding erbium- ytterbium co-doped fiber amplifiers were analyzed. Numerical analysis of

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

    PubMed

    Li, Jianfeng; Hao, Jingjun; Cui, Chunming

    2015-01-14

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

  6. Highly deformed Bands in {sup 175}Hf

    SciTech Connect

    Scholes, D.T.; Cullen, D.M. [Schuster Laboratory, University of Manchester, Manchester M13 9PL (United Kingdom); Kondev, F.G. [Nuclear Engineering, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Janssens, R.V.F.; Carpenter, M.P.; Abu Saleem, K.; Ahmad, I.; Heinz, A.; Khoo, T.L.; Lauritsen, T.; Lister, C.J.; Moore, E.F.; Seweryniak, D.; Wiedenhoever, I. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Hartley, D.J.; Djongolov, M.K.; Balabanski, D.L.; Danchev, M.; Goon, J.; Riedinger, L.L. [Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)] [and others

    2004-11-01

    Two high-spin regularly spaced rotational bands with large dynamical moments of inertia have been identified in {sup 175}Hf with the Gammasphere spectrometer. These new bands are very similar to the previously identified triaxial superdeformed bands in the hafnium nuclei. However, the new bands in {sup 175}Hf have been linked into the known level scheme and thereby provide the first firm spin assignments for these structures in this region. In order to understand the new bands, theoretical calculations have been performed based on the ULTIMATE CRANKER code. The new bands in {sup 175}Hf are deduced to be built upon highly deformed structures. No experimental evidence for triaxiality was established and this work suggests that the structure of the so-called 'triaxial' superdeformed bands in the Hf nuclei may be quite different from those identified in the lighter mass Lu nuclei. Since the two highly deformed bands in {sup 175}Hf are associated with different deformations, this work also identifies the role of the intruder orbits in polarizing the nuclear shape.

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

    E-print Network

    1991-01-01

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

  8. Sociolinguistics --syllabus LIGN 175, Fall 2013

    E-print Network

    Sociolinguistics -- syllabus LIGN 175, Fall 2013 Section ID # 786611 TuTh 2:00-3:20pm, Center 214://Ted.ucsd.edu/ ­ This syllabus, a reminder calendar, any updates or announce- ments, lecture slides or notes, links, assignments. 3 of this syllabus. materials will be broadcast on Ted. A discussion board will also be available

  9. Commentaries 175 Blackwell Publishers Ltd. 2002

    E-print Network

    Marcus, Gary F.

    In the current model the output units innately represent unity versus non-unity, doing so prior to experienceCommentaries 175 © Blackwell Publishers Ltd. 2002 Kohonen, T. (1997). Self-organizing maps. Berlin component in the organization of the model, but the vast majority of the model's connections are innately

  10. Calculation of electron scattering from the ground state of ytterbium

    SciTech Connect

    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

    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.

  11. High peak power Ytterbium doped diode pumped fiber amplifier system

    NASA Astrophysics Data System (ADS)

    Madasamy, P.; Kimpel, F.; Torruellas, W.

    2007-04-01

    We have developed a fiber laser system capable of producing over 100W of average power. We have achieved 1.5mJ/pulse/fiber resulting in peak powers in excess of 2MW with 0.6ns pulses and near diffraction limited beams. In another fiber, we have achieved over 0.5mJ/pulse with pulses of 700ps exceeding 500kW of peak power in polarization maintaining Ytterbium doped fiber. In both cases, wall-plug efficiencies, excluding cooling of the pump diode lasers, in excess of 15% were also achieved. The system we have developed is based in an all fiber design except for the last high peak power isolator requiring free space optics. With the advent of such a component, a scalable 1.5MW/arm all fiber laser system is proven to be possible.

  12. High peak power ytterbium-doped fiber amplifiers

    NASA Astrophysics Data System (ADS)

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

    2006-02-01

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

  13. Research of high brightness 1018nm ytterbium doped fiber laser

    NASA Astrophysics Data System (ADS)

    Wang, Yanshan; Ke, Weiwei; Sun, Yinghong; Ma, Yi; Li, Tenglong; Feng, Yujun; Wu, Juan

    2015-02-01

    The effect of the gain fiber parameters for the design of a short wavelength ytterbium doped fiber laser (YDFL) is analyzed theoretically, and based on these analyses, we find viable approaches to improve the laser performances. High power 1018 nm YDFL system was constructed, output characteristics of 1018 nm laser with the core/cladding, doping concentration and gain fiber length are experimentally investigated. It is found that increasing the core/cladding area ratio, reducing the doping concentration and shortening the fiber length is effective way to suppress the amplified spontaneous emission (ASE) gain and ensure the laser operation at 1018 nm. A record output power of 154 W at 1018 nm is obtained, with a brightness of 5.7GW/cm2 -sr, optical-optical conversion efficiency is 71% when the laser operated at maximal power. Meanwhile, ASE and spurious oscillation are suppressed efficiently.

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

    PubMed

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

    2001-05-01

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

  15. Atomic layer deposition for fabrication of ytterbium doped fibers

    NASA Astrophysics Data System (ADS)

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

    2012-02-01

    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.

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

    SciTech Connect

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

    1999-02-01

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

  17. Characteristics of the Brillouin spectra in Erbium-Ytterbium fibers.

    PubMed

    Canat, G; Durécu, A; Lesueur, G; Lombard, L; Bourdon, P; Jolivet, V; Jaouën, Y

    2008-03-01

    This paper reports the main characteristics of the Stokes spectra for typical pumped and unpumped Erbium-Ytterbium doped fibers. Doped fibers show shorter Brillouin shifts and their spectra are up to 1.6 times broader than undoped fibers. Those spectra are composed of several peaks originating from several longitudinal acoustic modes. The effective Brillouin gain of the secondary modes can be as large as 20% of the main peak gain. They can merge into a more complex structure for the largest cores. Simulations allow to relate these characteristics to the influence of codoping and index profile inhomogeneity. An additional broadening of the Stokes spectrum in pumped fibers is reported and attributed to thermal effects. PMID:18542409

  18. Neodymium, erbium, and ytterbium co-doped fiber amplifier

    NASA Astrophysics Data System (ADS)

    Ron, Itai; Hardy, Amos A.

    2011-07-01

    A combination of erbium (Er), ytterbium (Yb), and neodymium (Nd), in fiber amplifiers, is examined. This combination extends the pumping wavelength spectrum by creating a new pumping path. Furthermore, the Nd addition enables pumping the amplifier from within the amplifier center, and thereby decreases the amplified spontaneous emission at the amplifier ends. A mathematical model is presented relating the excited population density, the signal power along the amplifier, the energy transfer among the ions, and the amplified spontaneous emissions. The study compares the amplifier characteristics of Er-Yb-Nd co-doped amplifier with a traditional Er-Yb amplifier for various combinations. The new configuration adds flexibility into the amplifier design. By properly selecting its parameters, one can increase the output signal power and decrease the amplified spontaneous emission, to comply with various requirements.

  19. High gain ytterbium doped Ge pedestal large pitch fiber

    NASA Astrophysics Data System (ADS)

    Gaida, Christian; Stutzki, Fabian; Jansen, Florian; Otto, Hans-Jürgen; Eidam, Tino; Jauregui, Cesar; Limpert, Jens; Tünnermann, Andreas

    2014-03-01

    Large mode area rod-type fibers have enabled amplification of ultra-short pulses to mJ pulse energy and MW peak powers. For very large mode field areas, fibers have to be designed as rigid rods with typical fiber lengths of around 1 m for efficient operation. A shorter fiber length can be desirable to reduce the packaging size of commercial systems and to decrease the impact of parasitic nonlinear effects for peakpower scaling. The fiber design presented here is based on a modified large-pitch fiber with an effectively higher ytterbium concentration in the fiber core. To achieve index matching the cladding index needs to be changed. In this contribution we propose to co-dope the passive host material with germanium to match both indices and to obtain a higher Yb-concentration within the active core. Compared to standard LPF, where the core index is reduced by co-doping the core with Flourine, the ytterbium doping concentration of this novel germanium-pedestal LPF is doubled. A detailed numerical and experimental investigation shows that with short fiber lengths <40cm is feasible to achieve output powers beyond 100W with 10W seed. Significantly higher gains, of nearly 30 dB, can be achieved for fiber lengths in the order of 60cm. A similar gain can be expected in a conventional LPF with 1.20 m length. In conclusion, we demonstrate a fiber design for significantly enhanced energy storage per fiber length and improved pump absorption. This concept will notably reduce the footprint of ultra-short fiber laser systems.

  20. 9 CFR 381.175 - Records required to be kept.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...381.175 Section 381.175 Animals and Animal Products FOOD SAFETY AND INSPECTION...commerce, for use as human food or animal food; (2) Any person that...this part. (5) Records of nutrition labeling as required by...

  1. 9 CFR 381.175 - Records required to be kept.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...381.175 Section 381.175 Animals and Animal Products FOOD SAFETY AND INSPECTION...commerce, for use as human food or animal food; (2) Any person that...this part. (5) Records of nutrition labeling as required by...

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

    Code of Federal Regulations, 2011 CFR

    2011-04-01

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

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

    Code of Federal Regulations, 2014 CFR

    2014-04-01

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

  4. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

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

  5. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

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

  6. 27 CFR 53.175 - Readjustment for local advertising charges.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

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

  7. 13 CFR 120.175 - Coastal barrier islands.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

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

  8. 7 CFR 1726.175 - General plant materials.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 2014-01-01 false General plant materials. 1726.175...SERVICE, DEPARTMENT OF AGRICULTURE ELECTRIC SYSTEM CONSTRUCTION POLICIES AND PROCEDURES General Plant § 1726.175 General plant materials. This...

  9. 7 CFR 1726.175 - General plant materials.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 2012-01-01 false General plant materials. 1726.175...SERVICE, DEPARTMENT OF AGRICULTURE ELECTRIC SYSTEM CONSTRUCTION POLICIES AND PROCEDURES General Plant § 1726.175 General plant materials. This...

  10. 7 CFR 1726.175 - General plant materials.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...2013-01-01 2013-01-01 false General plant materials. 1726.175...SERVICE, DEPARTMENT OF AGRICULTURE ELECTRIC SYSTEM CONSTRUCTION POLICIES AND PROCEDURES General Plant § 1726.175 General plant materials. This...

  11. 40 CFR 180.175 - Maleic hydrazide; tolerances for residues.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Maleic hydrazide; tolerances for residues. 180.175 Section 180.175...ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PESTICIDE PROGRAMS TOLERANCES AND EXEMPTIONS FOR PESTICIDE CHEMICAL RESIDUES IN FOOD Specific Tolerances §...

  12. 18 CFR 367.1750 - Account 175, Derivative instrument assets.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Account 175, Derivative instrument assets. 367.1750...Assets § 367.1750 Account 175, Derivative instrument assets. This account must include the amounts paid for derivative instruments, and the change...

  13. 18 CFR 367.1750 - Account 175, Derivative instrument assets.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Account 175, Derivative instrument assets. 367.1750...Assets § 367.1750 Account 175, Derivative instrument assets. This account must include the amounts paid for derivative instruments, and the change...

  14. 18 CFR 367.1750 - Account 175, Derivative instrument assets.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Account 175, Derivative instrument assets. 367.1750...Assets § 367.1750 Account 175, Derivative instrument assets. This account must include the amounts paid for derivative instruments, and the change...

  15. 18 CFR 367.1750 - Account 175, Derivative instrument assets.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Account 175, Derivative instrument assets. 367.1750...Assets § 367.1750 Account 175, Derivative instrument assets. This account must include the amounts paid for derivative instruments, and the change...

  16. 18 CFR 367.1750 - Account 175, Derivative instrument assets.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Account 175, Derivative instrument assets. 367.1750...Assets § 367.1750 Account 175, Derivative instrument assets. This account must include the amounts paid for derivative instruments, and the change...

  17. 40 CFR 68.175 - Prevention program/Program 3.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Prevention program/Program 3. 68.175 Section...PROGRAMS (CONTINUED) CHEMICAL ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.175 Prevention program/Program 3....

  18. 175Hp contrarotating homopolar motor design report

    NASA Astrophysics Data System (ADS)

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

    1994-06-01

    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.

  19. 21 CFR 133.175 - Pasteurized cheese spread.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Pasteurized cheese spread. 133.175 Section 133.175 Food and Drugs...Related Products § 133.175 Pasteurized cheese spread. Pasteurized cheese spread is the food which conforms to the...

  20. 21 CFR 133.175 - Pasteurized cheese spread.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Pasteurized cheese spread. 133.175 Section 133.175 Food and Drugs...Related Products § 133.175 Pasteurized cheese spread. Pasteurized cheese spread is the food which conforms to the...

  1. Erbium:ytterbium planar waveguide laser in ion-exchanged glass

    NASA Astrophysics Data System (ADS)

    Winick, Kim A.; Vossler, Gerald L.

    1997-05-01

    Erbium-ytterbium co-doped is an attractive system for short, efficient lasers and amplifiers operating in the 1.5 micron band. Co-doping permits a cooperative cross-relaxation process to transfer energy from excited ytterbium ions to the erbium system. This process can be used as a transfer energy from excited ytterbium ions to the erbium system. This process can be used as a pumping mechanism at 980 nanometers to significantly increase the absorbed pump power.Efficient energy transfer between the ytterbium and erbium ions enables the operation of compact laser devices with low erbium concentration, thus avoiding parasitic effects. The material parameters of a co-doped glass, including the cross-relaxation coefficient, are measured. A rate equation analysis of the co-doped system is developed, and approximate analytic expressions are derived for the lasing threshold, slope efficiency, and maximum output power. Short, ion-exchanged, waveguide lasers are fabricated in co-doped erbium-ytterbium glass. Lasing is achieved around 1537 nanometers with a launch power threshold and slope efficiency of approximately 15 milliwatts and 5.5 percent, respectively.

  2. Ytterbium-doped glass-ceramics for optical refrigeration.

    PubMed

    Filho, Elton Soares de Lima; Krishnaiah, Kummara Venkata; Ledemi, Yannick; Yu, Ye-Jin; Messaddeq, Younes; Nemova, Galina; Kashyap, Raman

    2015-02-23

    We report for the first time the characterization of glass-ceramics for optical refrigeration. Ytterbium-doped nanocrystallites were grown in an oxyfluoride glass matrix of composition 2YbF3:30SiO2-15Al2O3-25CdF2-22PbF2-4YF3, forming bulk glass-ceramics at three different crystalisation levels. The samples are compared with a corresponding uncrystalised (glass) sample, as well as a Yb:YAG sample which has presented optical cooling. The measured X-ray diffraction spectra, and thermal capacities of the samples are reported. We also report for the first time the use of Yb:YAG as a reference for absolute photometric quantum efficiency measurement, and use the same setup to characterize the glass and glass-ceramic samples. The cooling figure-of-merit was measured by optical calorimetry using a fiber Bragg grating and found to depend on the level of crystallization of the sample, and that samples with nanocrystallites result in higher quantum efficiency and lower background absorption than the pure-glass sample. In addition to laser-induced cooling, the glass-ceramics have the potential to serve as a reference for quantum efficiency measurements. PMID:25836500

  3. Simulating Quantum Spin Models with Trapped Ytterbium Ions^1

    NASA Astrophysics Data System (ADS)

    Chang, M.-S.; Kim, K.; Korenblit, S.; Islam, K. R.; Sterk, J. D.; Chew, A.; Slusher, R.; Monroe, C.

    2008-05-01

    Simulating large quantum many-body systems is practically impossible with classical computers, as it requires resources exponential in the system size. An array of cold trapped ions has recently been identified as a promising candidate for exploring many-body spin Hamiltonians. This is due to superb control of their quantum states and interactions, high-fidelity spin state detection of each and every ion, and very long coherence time. We will initially work with less than 10 ions, but will speculate on how this may be scaled up to larger numbers of spins. We will report the recent progress toward quantum simulations of Heisenberg-like spin Hamiltonians [1] with trapped Ytterbium ions in a linear Paul trap. [1] D. Porras and J. I. Cirac, Phys. Rev. Lett. 92, 207901 (2004) ^1This work is supported by the DARPA OLE Program under ARO Award W911NF-07-1-0576, IARPA under ARO contract W911NF-04-1-0234, and the NSF PIF Program under grant PHY-0601255.

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

    NASA Astrophysics Data System (ADS)

    Chen, Ning; Xu, Xinye

    2015-01-01

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

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

    NASA Astrophysics Data System (ADS)

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

    2014-03-01

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

  6. Chemisorption of ammonia molecules on ytterbium nanofilms deposited on silicon Si(111) at room temperature

    NASA Astrophysics Data System (ADS)

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

    2014-12-01

    The interaction of ammonia molecules with the surface of ytterbium nanofilms of uniform thickness grown on a Si(111) 7 × 7 substrate and forming a chemically sharp interface with it has been investigated. It has been found that this interaction depends significantly on the thickness of nanofilms. For a film thickness equal to 5 monoatomic layers, chemisorption of ammonia has an essentially nondissociative character and the molecules form a donor-acceptor bond with ytterbium; as a result, the metal transforms from the divalent state into a new nonautonomous trivalent state. For other film thicknesses, the adsorbed molecules dissociate, nitrogen atoms diffuse into the bulk of the film and enter into the reaction with silicon, and ytterbium remains in the initial divalent state. It has been shown that the character of the interaction of ammonia molecules with ytterbium nanofilms and the stability of the NH3-Yb-Si(111) structures are determined by the standing waves of electron density (Friedel oscillations) generated by the interface between the metal and silicon substrate.

  7. Ytterbium triflate hydrate catalyzed Michael addition and cyclocondensation of ?,?-unsaturated ketones with active methylene compounds

    Microsoft Academic Search

    Zhi Wei Chen; Yan Li Wang; Ren Er Chen; Wei Ke Su

    2008-01-01

    Catalyzed by ytterbium(III) triflate hydrate [Yb(OTf)3·xH2O], the Michael addition and cyclocondensation of ?,?-unsaturated ketones with active methylene compounds to afford the 1,4-adducts and benzo[b]pyran derivatives, respectively were studied.

  8. A High-Efficiency Ytterbium-Doped Fiber Amplifier Designed for Interplanetary Laser Communications

    Microsoft Academic Search

    Neal W. Spellmeyer; David O. Caplan; Bryan S. Robinson; David Sandberg; Mark L. Stevens; Matt M. Willis; Denis V. Gapontsev; Nikolai S. Platonov; Alexander Yusim

    2007-01-01

    Design, performance, and environmental screening of flight prototype Ytterbium amplifiers designed for the Mars Laser Communications Demonstration are described. The high-reliability design delivered >8-W average power with low-duty-cycle PPM waveforms and >21% electrical-to-optical conversion efficiency.

  9. Topological Crystalline Kondo Insulator in Mixed Valence Ytterbium Borides Hongming Weng,1,2

    E-print Network

    Wang, Wei Hua

    Topological Crystalline Kondo Insulator in Mixed Valence Ytterbium Borides Hongming Weng,1 7 January 2014) The electronic structures of two mixed valence insulators YbB6 and YbB12 are studied theory. YbB6 is found to be a moderately correlated Z2 topological insulator, similar to SmB6 but having

  10. Novel PEG-organized biocompatible fluorescent nanoparticles doped with an ytterbium cyanoporphyrazine complex for biophotonic applications.

    PubMed

    Klapshina, Larisa G; Douglas, William E; Grigoryev, Ilya S; Ladilina, Elena Yu; Shirmanova, Marina V; Mysyagin, Sergey A; Balalaeva, Irina V; Zagaynova, Elena V

    2010-11-28

    The preparation and properties are described of two types of novel PEG-organized nanoparticles including silica-modified uniform disk-shaped nanoparticles doped with a fluorescent ytterbium cyanoporphyrazine complex; a large enhancement of red emission for both types of nanoparticles is observed in physiological liquids owing to their binding to biomolecules. PMID:20927471

  11. On thermal effects in solid state lasers: the case of ytterbium-doped materials

    E-print Network

    Paris-Sud XI, Université de

    -induced optical phase shift. III.6.1. Expression of the optical path III.6.2. The thermal lens focal length III.7 of the thermal lens. IV. Thermal lensing techniques IV.1. Introduction IV.2. Geometrical methods IV.3. Methods1 /115 On thermal effects in solid state lasers: the case of ytterbium-doped materials Sébastien

  12. Simultaneous measurement of thermal lens and temperature map in ytterbium-doped fluoride crystals

    E-print Network

    Paris-Sud XI, Université de

    Simultaneous measurement of thermal lens and temperature map in ytterbium-doped fluoride crystals J assessment of both the temperature map and the thermal lens (TL) properties of Yb3+ :CaF2 and Yb3+ :SrF2 with or without laser operation. We notice that all TL dioptric powers (Dth) are negative. Since the thermal lens

  13. Thermal behaviour of ytterbium-doped fluorite crystals under high power pumping

    E-print Network

    Boyer, Edmond

    us to measure temperature gradients, thermal lens, and absorption coefficients. FromThermal behaviour of ytterbium-doped fluorite crystals under high power pumping J. Boudeile,1* J *Corresponding author: justine.boudeile@institutioptique.fr Abstract: We report an in situ thermal study of Yb

  14. Coherent combination of two ytterbium fiber amplifier based on an active segmented mirror

    Microsoft Academic Search

    Ping Yang; Ruofu Yang; Feng Shen; Xinyang Li; Wenhan Jiang

    2009-01-01

    To control the phase noise of two ytterbium fiber amplifiers, a coherent combination system based on an active segmented mirror (ASM) has been established in our laboratory. The ASM is controlled by a feed back control loop on the basis of a Peak Rate (PR) algorithm which is realized on a DSP+FPGA hardware control board. Experimental results indicate that when

  15. Ytterbium-doped silica fiber lasers: versatile sources for the 1-1.2 ?m region

    Microsoft Academic Search

    H. M. Pask; Robert J. Carman; David C. Hanna; Anne C. Tropper; Colin J. Mackechnie; Paul R. Barber; Judith M. Dawes

    1995-01-01

    Ytterbium-doped silica fibers exhibit very broad absorption and emission bands, from ~800 nm to ~1064 nm for absorption and ~970 nm to ~1200 nm for emission. The simplicity of the level structure provides freedom from unwanted processes such as excited state absorption, multiphonon nonradiative decay, and concentration quenching. These fiber lasers therefore offer a very efficient and convenient means of

  16. Passively Q-Switched Ytterbium-and Chromium-doped All-Fiber Laser

    E-print Network

    Paris-Sud XI, Université de

    Passively Q-Switched Ytterbium- and Chromium-doped All-Fiber Laser Bernard Dussardier,1,* Jérôme, v.v.i., 182 51 Prague, Czech Republic * Corresponding author: bernard.dussardier@unice.fr A chromium time proposed a core-pumped, low power, all-fiber PQS laser [5] using a newly developed chromium

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

    NASA Astrophysics Data System (ADS)

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

    2002-11-01

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

  18. Extractable energy from erbium-ytterbium co-doped pulsed fiber amplifiers and lasers

    Microsoft Academic Search

    Yoav Sintov; Yaakov Glick; Tomer Koplowitch; Yehuda Nafcha

    2008-01-01

    An analytic model is developed for evaluating the extractable energy from high energy pulsed erbium-ytterbium co-doped fiber amplifiers and lasers. The energy extraction capabilities under the limitation of spurious lasing, due to amplified spontaneous emission (ASE), are mapped for various numerical apertures, single and multi transverse mode evolution and operating wavelengths. The model provides an assessment for the maximum pulse

  19. Study on double-cladding erbium-ytterbium codoped phosphate glass fiber amplifiers

    Microsoft Academic Search

    X. L. Huang; H. Y. Chen; Y. Z. Liu; J. Z. Dai; Y. P. Yang; J. Q. Song

    2002-01-01

    A novel double-cladding erbium-ytterbium co-doped fiber amplifier (EYCDFA) based phosphate glass (LGS-L) fabricated by ourselves is theoretically designed. Numerical calculation demonstrates its gain per unit is higher than EYCDFA based on silica glass, and it is promising for the next generation of WDM network with high channel counts.

  20. Gain and noise in ytterbium-sensitized erbium-doped fiber amplifiers: measurements and simulations

    Microsoft Academic Search

    Martin Achtenhagen; Robert James Beeson; Feng Pan; Bruce Nyman; Amos Hardy

    2001-01-01

    The fiber gain and noise figure in erbium (Er)-ytterbium (Yb) codoped fiber amplifiers are experimentally studied and theoretically modeled. The different fiber parameters for the model are found in separate characterization measurements. The comparison between the measured and calculated data show excellent agreement. In addition, we demonstrate the design process for a specific cladding-pumped fiber to find the optimum fiber

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

    Microsoft Academic Search

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

    2006-01-01

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

  2. Highly efficient, high power, inband-pumped Erbium\\/Ytterbium-codoped fiber laser

    Microsoft Academic Search

    Ee-Leong Lim; Shaif-ul Alam; David J. Richardson

    2011-01-01

    A highly efficient (~80%), high power (18.45W) in-band pumped Erbium\\/Ytterbium- codoped fiber laser is demonstrated. Based on a fitted simulation model, the detrimental effect of pair induced quenching in high power operation is also highlighted. ©2011 Optical Society of America OCIS codes: (140.3500) Lasers, erbium; (140.3280) Laser amplifiers; (140.3510) Lasers, fiber

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

    SciTech Connect

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

    2011-09-30

    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 %.

  4. J. Phys. II France 6 (1996) 175-185 FEBRUARY 1996, PAGE 175 ~He Optical Pumping with frequency Modulated Light

    E-print Network

    Boyer, Edmond

    J. Phys. II France 6 (1996) 175-185 FEBRUARY 1996, PAGE 175 ~He Optical Pumping with frequency) PACS.32.80.Bx Level crossing and optical pumping PACS.42.60.-v Laser optical systems: design) for helium optical pumping experiments. An interesting feature of the new device is the possibility

  5. Ytterbium-catalysed conjugate allylation of alkylidene malonates and enantioselective nickel-catalysed Michael additions of azaarylacetates and acetamides to nitroalkenes 

    E-print Network

    Fallan, Charlene

    2012-11-28

    I. Catalytic Conjugate Allylation of Alkylidene Malonates Nucleophilic conjugate addition of allylsilanes and allylstannanes to alkylidene malonates under the action of ytterbium catalysis in the presence of hexafluoro ...

  6. Ytterbium-porphyrins as a new class of the luminescent labels

    NASA Astrophysics Data System (ADS)

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

    2007-08-01

    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.

  7. High power laser fiber fabricated through vapor phase doping of Ytterbium

    NASA Astrophysics Data System (ADS)

    Sen, R.; Saha, M.; Pal, A.; Pal, M.; Leich, M.; Kobelke, J.

    2014-08-01

    We present the characteristics of an ytterbium-doped alumino-silicate fiber, fabricated through vapor phase doping of aluminum and ytterbium in the core, along with silica and in conjunction with the modified chemical vapor deposition process. The vapor phase doping of rare-earths provides the opportunity to fabricate large core active fibers with a uniform distribution of dopants. The fibers fabricated exhibited low OH? content, negligible center dip and good optical properties. Lasing performance was tested up to output power of 105?W, with a slope efficiency of 77% with respect to launched pump power. The linear variation of the laser power with a pump shows its potentiality for further power scaling.

  8. Thulium and Ytterbium-Doped Titanium Oxide Thin Films Deposited by Ultrasonic Spray Pyrolysis

    NASA Astrophysics Data System (ADS)

    Forissier, Sébastien; Roussel, Hervé; Chaudouet, Patrick; Pereira, Antonio; Deschanvres, Jean-Luc; Moine, Bernard

    2012-12-01

    Thin films of thulium and ytterbium-doped titanium oxide were grown by metal-organic spray pyrolysis deposition from titanium(IV)oxide bis(acetylacetonate), thulium(III) tris(2,2,6,6-tetramethyl-3,5-heptanedionate) and ytterbium(III) tris(acetylacetonate). Deposition temperatures have been investigated from 300 to 600 °C. Films have been studied regarding their crystallinity and doping quality. Structural and composition characterisations of TiO2:Tm,Yb were performed by electron microprobe, x-ray diffraction, and Fourier transform infrared spectroscopy. The deposition rate can reach 0.8 ?m/h. The anatase phase of TiO2 was obtained after synthesis at 400 °C or higher. Organic contamination at low deposition temperature is eliminated by annealing treatments.

  9. 46 CFR 133.175 - Survival craft and rescue boat equipment.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Survival craft and rescue boat equipment. 133.175 Section...OSVs § 133.175 Survival craft and rescue boat equipment. (a) All rescue... Table 133.175—Survival Craft Equipment Item No....

  10. 46 CFR 199.175 - Survival craft and rescue boat equipment.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Survival craft and rescue boat equipment. 199.175 Section...Vessels § 199.175 Survival craft and rescue boat equipment. (a) All lifeboat... Table 199.175—Survival Craft Equipment Item No....

  11. Atomic emission determination of samarium, europium, ytterbium, and lutetium in silicate rocks

    SciTech Connect

    Drobyshev, A.I.; Turkin, Yu.I.; Yakimova, N.M.

    1986-06-01

    A procedure is discussed that has been developed for the atomic emission determination of samarium, europium, ytterbium and lutetium in silicate rocks, using a cooled hollow cathode as the source of spectrum excitation. By using an isotope dilution procedure, the relative standard deviation can be reduced to 0.007 for a range of determined contents of the elements from n ha 10/sup -4/ to n ha 10/sup -3/% by weight.

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

    NASA Technical Reports Server (NTRS)

    Numata, Kenji; Camp, Jordan

    2012-01-01

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

  13. High output power Erbium-Ytterbium doped cladding pumped fiber amplifier

    Microsoft Academic Search

    S. W. Harun; M. R. A. Moghaddam; H. Ahmad

    2010-01-01

    The performance of a high output power Erbium-Ytterbium doped fiber amplifier (EYDFA) pumped by a 927 nm laser diode are proposed\\u000a and experimentally investigated. The EYDFA provides a flat gain and output power higher than 23 dBm in the wavelength region\\u000a from 1545 to 1566 nm using a double-pass configuration. A broadband fiber Bragg grating is used in the double-pass

  14. High output power Erbium-Ytterbium doped cladding pumped fiber amplifier

    Microsoft Academic Search

    S. W. Harun; M. R. A. Moghaddam; H. Ahmad

    2010-01-01

    The performance of a high output power Erbium-Ytterbium doped fiber amplifier (EYDFA) pumped by a 927 nm laser diode are proposed and experimentally investigated. The EYDFA provides a flat gain and output power higher than 23 dBm in the wavelength region from 1545 to 1566 nm using a double-pass configuration. A broadband fiber Bragg grating is used in the double-pass

  15. Experimental and theoretical analysis of the resonant nonlinearity in ytterbium-doped fiber

    Microsoft Academic Search

    John W. Arkwright; P. Elango; Graham R. Atkins; T. Whitbread; J. F. Digonnet

    1998-01-01

    Experimental measurements are described characterizing the nonlinear index change over the range from 500 to 1550 nm induced in an ytterbium (Yb3+)-doped twin-core fiber by a 980 nm pump. At 1550 nm, a phase change of ? is induced with as little as 14 mW of pump power for a signal loss of only 0.2 dB, By allowing the doped

  16. Integrated optics erbium ytterbium amplifier system in 10 Gb\\/s fiber transmission experiment

    Microsoft Academic Search

    J.-M. P. Delavaux; S. Granlund; O. Mizuhara; L. D. Tzeng; D. Barbier; M. Rattay; F. S. Andre; A. Kevorkian

    1996-01-01

    We report the full characterization of a pigtailed erbium-ytterbium co-doped planar glass waveguide laser amplifier module. With a single 980 nm diode pump, this ion-exchanged 4.5 cm long device delivers signal gain of 16.5 dB, noise figure of 4.5 dB, and saturated power of a 12.5 dBm. To confirm its stability, we tested this module as a power booster in

  17. Noise figure limitation in ytterbium-codoped erbium-doped fiber amplifiers pumped at 1064 nm

    Microsoft Academic Search

    P. F. Wysocki; G. Nykolak; D. S. Shenk

    1996-01-01

    Summary form only given. Erbium\\/ytterbium-doped optical fiber amplifiers (EYDFAs) are attractive because they convert the power available in 1064-nm neodymium-doped sources to 1550 nm. In many potential applications such as CATV, LAN, and WDM systems, an excellent noise figure (NF) is required. In 980-nm pumped erbium-doped fiber amplifiers (EDFAs), a 3-dB NF can be achieved. We show this is not

  18. Subpicosecond pulse amplification in a short length, highly doped erbium\\/ytterbium phosphate fiber amplifier

    Microsoft Academic Search

    Arturo Chavez-Pirson; Wenyan Tian; Shibin Jiang; Gregory Katona; Jane Lee; Axel Schülzgen; Nasser Peyghambarian

    We demonstrate sub-picosecond pulse amplification in a single mode, high gain, and short length (8cm) erbium-ytterbium phosphate fiber amplifier. The amplifier operates in saturation producing 100 mW of average power and 2 nJ per pulse. ©2006 Optical Society of America OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; 060.7140 Ultrafast processes in fibers; (060.2410) Fiber, erbium

  19. Experimental and theoretical studies on ytterbium sensitized erbium-doped fiber amplifier

    Microsoft Academic Search

    M. R. A. Moghaddam; S. W. Harun; R. Parvizi; Z. S. Salleh; H. Arof; A. Lokman; H. Ahmad

    2011-01-01

    The performance of a high power erbium–ytterbium doped fiber amplifier (EYDFA) is investigated experimentally and theoretically. The EYDFA provides a flat gain with an output power higher than 23dBm in the wavelength region from 1541 to 1565nm using a multimode pumping at 927nm. In the theoretical analysis, the rate and power propagation equations are solved to examine the effect of

  20. Optimization of pulse amplification in ytterbium-doped double-clad fiber amplifiers

    Microsoft Academic Search

    Yong Wang

    2005-01-01

    In the present paper, high-power continuous-wave (CW)-pumped ytterbium-doped double-clad (YDDC) fiber amplifiers for the amplification of nanosecond pulses with tens of kilohertz repetition rates are numerically studied. Targeting pulse energy and average output power, the fiber amplifiers under forward, backward, and bidirectional pump are systematically analyzed and optimized in consideration of pump and signal wavelengths, pulse repetition rate, fiber structure

  1. Integrated optics erbium-ytterbium amplifier system in 10Gb\\/s fiber transmission experiment

    Microsoft Academic Search

    J.-M. P. Delavaux; S. Granlund; O. Mizuhara; L. D. Tzeng; D. Barbier; M. Rattay; F. St. Andre; A. Kevorkian

    1997-01-01

    We report the full characterization of a pigtailed erbium-ytterbium codoped planar glass waveguide amplifier module. With a single 980-nm diode pump, this ion-exchanged 4.5-cm-long device delivers a signal gain of 16.5 dB, a noise figure of 5 dB, and a saturated output power of 12.5 dBm. To verify its practicality and stability, we tested this module as a power booster

  2. Efficient compression of the femtosecond pulses of an ytterbium laser in a gas-filled capillary

    SciTech Connect

    Konyashchenko, Aleksandr V; Losev, Leonid L; Tenyakov, S Yu

    2011-07-31

    A 290-fs radiation pulse of an ytterbium laser system with a central wavelength of 1028 nm and an energy of 145 {mu}J was compressed to a 27-fs pulse with an energy of 75 {mu}J. The compression was realised on the basis of the effect of pulse spectrum broadening in a xenon-filled glass capillary for a pulse repetition rate of 3kHz. (control of laser radiation parameters)

  3. 14 CFR 135.175 - Airborne weather radar equipment requirements.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 2014-01-01 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...

  4. 14 CFR 135.175 - Airborne weather radar equipment requirements.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...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...

  5. 14 CFR 135.175 - Airborne weather radar equipment requirements.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 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...

  6. 14 CFR 135.175 - Airborne weather radar equipment requirements.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 2011-01-01 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...

  7. 14 CFR 135.175 - Airborne weather radar equipment requirements.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 2012-01-01 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...

  8. 40 CFR 60.175 - Monitoring of operations.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...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...

  9. 40 CFR 60.175 - Monitoring of operations.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...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...

  10. 40 CFR 60.175 - Monitoring of operations.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...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...

  11. 50 CFR 217.175 - Requirements for monitoring and reporting.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Maintenance of the Neptune Liquefied Natural Gas Facility Off Massachusetts § 217.175 Requirements for monitoring and reporting...marine mammal species observed in the project area in the Massachusetts Bay during the period of Port operations and...

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

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.175 Prevention...recent change that triggered management of change procedures and the...recent review or revision of management of change procedures....

  13. 40 CFR 68.175 - Prevention program/Program 3.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.175 Prevention...recent change that triggered management of change procedures and the...recent review or revision of management of change procedures....

  14. 40 CFR 68.175 - Prevention program/Program 3.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.175 Prevention...recent change that triggered management of change procedures and the...recent review or revision of management of change procedures....

  15. 40 CFR 68.175 - Prevention program/Program 3.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.175 Prevention...recent change that triggered management of change procedures and the...recent review or revision of management of change procedures....

  16. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...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...

  17. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...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...

  18. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...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...

  19. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...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...

  20. 29 CFR 1952.175 - Changes to approved plans.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...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...

  1. 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

  2. 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

  3. 40 CFR 180.175 - Maleic hydrazide; tolerances for residues.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  4. 40 CFR 180.175 - Maleic hydrazide; tolerances for residues.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

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

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  6. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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

  7. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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

  8. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  9. 46 CFR 170.175 - Stability test: General.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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

  10. 50 CFR 218.175 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Navy Research, Development, Test, and Evaluation Activities in the Naval Sea System Command (NAVSEA) Naval Undersea Warfare Center (NUWC) Keyport Range Complex and the Associated Proposed Extensions Study Area § 218.175...

  11. 50 CFR 218.175 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Navy Research, Development, Test, and Evaluation Activities in the Naval Sea System Command (NAVSEA) Naval Undersea Warfare Center (NUWC) Keyport Range Complex and the Associated Proposed Extensions Study Area § 218.175...

  12. 50 CFR 218.175 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Navy Research, Development, Test, and Evaluation Activities in the Naval Sea System Command (NAVSEA) Naval Undersea Warfare Center (NUWC) Keyport Range Complex and the Associated Proposed Extensions Study Area § 218.175...

  13. 50 CFR 218.175 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Navy Research, Development, Test, and Evaluation Activities in the Naval Sea System Command (NAVSEA) Naval Undersea Warfare Center (NUWC) Keyport Range Complex and the Associated Proposed Extensions Study Area § 218.175...

  14. 7 CFR 97.175 - Fees and charges.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...and Charges § 97.175 Fees and charges. The following fees and charges apply to the services and actions specified...exceed $107.00 per employee-hour. Charges also will be made for materials, space, and administrative costs....

  15. 7 CFR 97.175 - Fees and charges.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...and Charges § 97.175 Fees and charges. The following fees and charges apply to the services and actions specified...exceed $107.00 per employee-hour. Charges also will be made for materials, space, and administrative costs....

  16. 7 CFR 97.175 - Fees and charges.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...and Charges § 97.175 Fees and charges. The following fees and charges apply to the services and actions specified...exceed $107.00 per employee-hour. Charges also will be made for materials, space, and administrative costs....

  17. 7 CFR 97.175 - Fees and charges.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...and Charges § 97.175 Fees and charges. The following fees and charges apply to the services and actions specified...exceed $107.00 per employee-hour. Charges also will be made for materials, space, and administrative costs....

  18. 7 CFR 97.175 - Fees and charges.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...and Charges § 97.175 Fees and charges. The following fees and charges apply to the services and actions specified...exceed $107.00 per employee-hour. Charges also will be made for materials, space, and administrative costs....

  19. IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 3, NO. 4, AUGUST 1997 1065 Short Cavity Erbium/Ytterbium Fiber Lasers

    E-print Network

    Bergman, Keren

    Cavity Erbium/Ytterbium Fiber Lasers Mode-Locked with a Saturable Bragg Reflector Brandon C. Collings, W. Y. Jan, M. Koch, and W. H. Knox Abstract-- We present short cavity erbium/ytterbium fiber lasers-doped fiber amplifiers and soliton pulse propagation is supported. To be practical, these sources must

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

    NASA Astrophysics Data System (ADS)

    Vanhoutte, Michiel

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

  1. Photoluminescence of porous silicon stain etched and doped with erbium and ytterbium

    NASA Astrophysics Data System (ADS)

    Díaz-Herrera, B.; González-Díaz, B.; Guerrero-Lemus, R.; Hernández-Rodríguez, C.; Méndez-Ramos, J.; Rodríguez, V. D.

    2009-02-01

    A novel low cost process has been developed for application in porous silicon-based photodetectors and solar cells, where conventional doping processes are not affordable because of the high processing cost and technical difficulties. Ytterbium and erbium (Yb 3+-Er 3+) ions were introduced into luminescent porous silicon stain etched by thermal diffusion. Doping profiles were evaluated by energy-dispersive spectroscopy analysis. The visible and near-infrared photoluminescence of Yb 3+-Er 3+ co-doped stain-etched porous silicon layers is observed and evaluated under 980 nm pumping. Up-conversion processes that could improve the efficiency of silicon-based solar cells are detected.

  2. A study of isotopically selective photoionization of ytterbium atoms for laser isotope separation

    Microsoft Academic Search

    S. K. Borisov; M. A. Kuz'mina; V. A. Mishin

    1996-01-01

    Atomic-vapor laser isotope separation (AVLIS) is studied experimentally and theoretically for ytterbium vapors. The optimum ionization scheme and the process dynamics are determined. The photoionization scheme uses the transitions\\u000a$$6^1 S_0 \\\\mathop \\\\to \\\\limits^{555.648nm} 6^3 P_1 \\\\mathop \\\\to \\\\limits^{581.067nm} (7\\/2,3\\/2)_2 \\\\mathop \\\\to \\\\limits^{582.79nm} (52353cm^{ - 1} ).$$\\u000a For a numerical study of photoionization dynamics, the mathematical model of the AVLIS

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

    SciTech Connect

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

    2011-08-26

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

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

    SciTech Connect

    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

    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.

  5. Gain-switched ytterbium-doped rod-type fiber laser

    NASA Astrophysics Data System (ADS)

    Petkovšek, Rok; Agrež, Vid; Sangla, Damien; Saby, Julien; Boula Picard, Reynald; Salin, Francois

    2014-10-01

    The operation of a gain-switched ytterbium-doped rod-type fiber laser is presented in this paper. The pumping, output pulses, spectrum, and energy stability are analyzed. The two key parameters of the laser pulse achieved from the single-stage gain-switched system are a 43?ns pulse duration and a peak power of 4.4?kW. This is to our knowledge the highest peak power obtained from single stage gain switched Yb-doped fiber laser. Further a very good pulse-to-pulse stability with standard deviation of less than 1% was achieved.

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

    NASA Astrophysics Data System (ADS)

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

    2014-12-01

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

  7. Theoretical study on isotope separation of an ytterbium atomic beam by laser deflection

    NASA Astrophysics Data System (ADS)

    Zhou, Min; Xu, Xin-Ye

    2014-01-01

    Isotope separation by laser deflecting an atomic beam is analyzed theoretically. Interacting with a tilted one-dimensional optical molasses, an ytterbium atomic beam is split into multi-beams with different isotopes like 172Yb,173Yb, and 174Yb. By using the numerical calculation, the dependences of the splitting angle on the molasses laser intensity and detuning are studied, and the optimal parameters for the isotope separation are also investigated. Furthermore, the isotope separation efficiency and purity are estimated. Finally a new scheme for the efficient isotope separation is proposed. These findings will give a guideline for simply obtaining pure isotopes of various elements.

  8. The University of Texas System Systemwide Policy Policy: UTS175

    E-print Network

    Hofmann, Hans A.

    CFR Part 94 National Science Foundation Grant Policy Manual Section 510 Section 51.912, TexasThe University of Texas System Systemwide Policy Policy: UTS175 Page 1 of 3 1. Title Disclosure. Policy Sec. 1 Applicability. This policy applies to all University of Texas System institutions

  9. MMOIRES ORIGINAUX 175 Aptitude de l'espce Penicillium caseicolum

    E-print Network

    Paris-Sud XI, Université de

    M�MOIRES ORIGINAUX 175 Aptitude de l'espèce Penicillium caseicolum à la production d.N.R.A.) Ecole Nationale Supérieure Agronomique de Grignon (78) Sommaire L'aptitude de Penicillium caseicolum à positive est mise en évidence. Introduction Penicillium caseicolum Bainier forme à la surface de nombreux

  10. 27 CFR 25.175 - Prepayment of tax.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

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

  11. Iron nano-clusters in ytterbium films: a 57Fe Mössbauer spectroscopic study

    NASA Astrophysics Data System (ADS)

    Rojas-Ayala, C.; Herrera, W. T.; Dinóla, I. S.; Kraken, M.; Passamani, E. C.; Baggio-Saitovitch, E.; Litterst, F. J.

    2014-01-01

    We have performed a Mössbauer study on iron clusters that are formed in ytterbium films prepared by vapor co-deposition onto kapton substrates kept at room temperature. The film thicknesses were chosen in a range between 2.5 and 2.8 m. XRD of the films reveals a mixture of fcc- and hcp-like ytterbium. Iron concentrations were between 0.3 and 5 at %. All samples reveal hyperfine spectra attributed to only two types of iron clusters with well defined hyperfine parameters. The clusters are supposed to be formed at boundaries of hcp- and fcc-like grains. In addition there is found a small contribution from monomeric iron. Spectra taken at 4.2 K reveal a complex distribution of magnetic hyperfine fields. The dynamic origin of the spectral shape is supported by susceptibility data revealing spin-freezing at temperatures below ca. 10 K. This proves that the iron clusters have sizes on the order of nm.

  12. Study on the Effect of Nano Size of Strontium-Ytterbium Manganites on Some Physical Properties

    NASA Astrophysics Data System (ADS)

    Abdel-Latif, I. A.

    2011-10-01

    The present study devoted to studying the effect of particle size on electrical properties of multiferroic materials; YbMnO3 and Yb0.9Sr0.1MnO3 because of the growing interest in multiferroic materials. This great attention increased due to the potential applications in spintronics and in ferroelectromagnets, in addition to the inherent interest in the underlying physics of the coexistence of ferroelectricity and ferromagnetism. Ytterbium manganites were prepared using co-precipitation method from the initial pure chlorides of ytterbium, strontium and manganese to react with pure sodium hydroxide with the proper molar ratio. The synthesized semiconductor composites were studied in details in terms of their morphological and structural properties. The energy dispersive spectroscopy EDS reveals that the synthesized composites are in a proper stoichiometry of the proposed structure. The X-ray analysis of Yb0.9Sr0.1MnO3 exhibited that crystal structure is possessing mixed orthorhombic/hexagonal phase with space group Pnma (62) for orthorhombic phase while a space group P63cm (185) for hexagonal phase. The DC resistivity—temperature dependence measurements of Yb0.9Sr0.1MnO3 and YbMnO3 showed the semiconductor behavior.

  13. Tunable picosecond SESAM mode-locking ytterbium-doped double-clad LMA PCF oscillator

    NASA Astrophysics Data System (ADS)

    Li, Pingxue; Zhao, Ziqiang; Chi, Junjie; Yang, Chun; Zhang, Guangju; Hu, Haowei; Yao, Yifei; Li, Yao; Wang, Xiongfei; Zhong, Guoshun; Zhao, Hong; Jiang, Dongsheng

    2014-04-01

    A picosecond tunable ytterbium-doped double-clad fiber oscillator with semiconductor saturable absorber mirror (SESAM) mode-locking large mode area (LMA) photonic crystal fiber (PCF) is demonstrated. Without any tunable elements in the oscillator, we obtain self-starting mode locking ytterbium-doped fiber oscillator tunable over 35.5 nm. The center wavelength in the ranges from 1028.5 nm to 1064 nm with excellent beam quality is achieved by proper adjusting the polarization beam splitter (PBS), half-wave plate (HWF) and SESAM in the laser cavity. The output power ranges from 0.76 W to 1.01 W at the different center wavelengths under the same incident pump power. A narrow spectral bandwidth with only 0.25-0.5 nm and pulsed duration with 7.9 ps have been obtained at the different center wavelengths. The repetition rate has been measured to be about 45.9 MHz, which has a slight change for the different center wavelengths.

  14. 120?W subnanosecond ytterbium-doped double clad fiber amplifier and its application in supercontinuum generation

    NASA Astrophysics Data System (ADS)

    Chi, J.-J.; Li, P.-X.; Hu, H.; Yao, Y.-F.; Zhang, G.-J.; Yang, C.; Zhao, Z.-Q.

    2014-08-01

    We report a 120?W high average power all-fiber subnanosecond master oscillator power amplifier (MOPA) system with a two-stage amplifier chain. The seed source is an ytterbium-doped single mode fiber laser passively mode-locked by nonlinear polarization rotation (NPR). Its pulse width is tunable from 0.59?ns to 1.2?ns by changing the length of the laser cavity. The average output power of 91.5?mW is obtained at 26.3?MHz with pulse width of 0.59?ns. A large mode area double cladding high-absorption ytterbium-doped fiber is introduced into the master power amplifier to suppress the nonlinear effects. Finally, 120?W average output power is obtained with single pulse energy of 4.56??J, and its optical-to-optical conversion efficiency is up to 83.9%. In addition, we demonstrate 19.5?W average-power supercontinuum generation in photonic crystal fiber (PCF) using this subnanosecond pulsed fiber amplifier.

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

    E-print Network

    Pruttivarasin, Thaned

    2008-01-01

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

  16. Ytterbium- and chromium-doped fibre laser: from chaotic self-pulsing to passive Q-switching

    E-print Network

    Dussardier, Bernard; Peterka, P

    2011-01-01

    A spontaneously chaotic, self-pulsing ytterbium-doped fibre laser is partially stabilized into the passively Q-switched mode of operation using a chromium-doped saturable absorber fibre. This original all-fibre laser produces sustained and stable trains of smooth pulses at high repetition rate.

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

    E-print Network

    Boyer, Edmond

    Stimulated Luminescence, Ytterbium-doped silica optical fibers. I. INTRODUCTION HE radiation-induced degradation of rare-earth-doped fiber amplifiers or lasers has become a crucial concern for the space industry. Radiation effects on erbium (Er)- doped fibers (EDF) has been quite widely investigated for about 10 years

  18. Ytterbium(III) Triflate–Catalyzed Stereoselective Synthesis of ??Lactams via [2+2] Cyclocondensation in Ionic Liquid

    Microsoft Academic Search

    Rener Chen; Bingjian Yang; Weike Su

    2006-01-01

    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 solvent–catalyst systems.

  19. All-fiber 1085-nm wide supercontinuum source based on a mode-locked ytterbium fiber laser with dispersion compensation by a chirped fiber Bragg grating

    Microsoft Academic Search

    Robert Herda; Samuli Kivistö; Oleg G. Okhotnikov

    2008-01-01

    The pulses of an ytterbium-fiber laser with dispersion compensation provided by a chirped fiber Bragg grating are amplified in a core-pumped fiber amplifier and broadened in a photonic crystal fiber to an octave spanning supercontinuum.

  20. 21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...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...

  1. 21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...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...

  2. 21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...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...

  3. 21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...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...

  4. 21 CFR 175.260 - Partial phosphoric acid esters of polyester resins.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...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...

  5. 21 CFR 175.390 - Zinc-silicon dioxide matrix coatings.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 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...

  6. 21 CFR 175.390 - Zinc-silicon dioxide matrix coatings.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 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...

  7. 21 CFR 175.390 - Zinc-silicon dioxide matrix coatings.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 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...

  8. 21 CFR 175.390 - Zinc-silicon dioxide matrix coatings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 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...

  9. 49 CFR 175.501 - Special requirements for oxidizers and compressed oxygen.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...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,...

  10. 49 CFR 175.501 - Special requirements for oxidizers and compressed oxygen.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...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,...

  11. 49 CFR 175.501 - Special requirements for oxidizers and compressed oxygen.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...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,...

  12. 49 CFR 175.501 - Special requirements for oxidizers and compressed oxygen.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...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,...

  13. 49 CFR 175.501 - Special requirements for oxidizers and compressed oxygen.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...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,...

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

    Code of Federal Regulations, 2012 CFR

    2012-04-01

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

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

    Code of Federal Regulations, 2014 CFR

    2014-04-01

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

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

    Code of Federal Regulations, 2011 CFR

    2011-04-01

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

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

    Code of Federal Regulations, 2013 CFR

    2013-04-01

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

  18. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Section 417.175 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Detergents by Dry Blending Subcategory § 417.175...

  19. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...Section 417.175 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Detergents by Dry Blending Subcategory § 417.175...

  20. 49 CFR 175.900 - Handling requirements for carbon dioxide, solid (dry ice).

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Handling requirements for carbon dioxide, solid (dry ice). 175.900 Section... § 175.900 Handling requirements for carbon dioxide, solid (dry ice). Carbon dioxide, solid (dry ice) when...

  1. 49 CFR 175.900 - Handling requirements for carbon dioxide, solid (dry ice).

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Handling requirements for carbon dioxide, solid (dry ice). 175.900 Section... § 175.900 Handling requirements for carbon dioxide, solid (dry ice). Carbon dioxide, solid (dry ice) when...

  2. 49 CFR 175.900 - Handling requirements for carbon dioxide, solid (dry ice).

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Handling requirements for carbon dioxide, solid (dry ice). 175.900 Section... § 175.900 Handling requirements for carbon dioxide, solid (dry ice). Carbon dioxide, solid (dry ice) when...

  3. 49 CFR 175.900 - Handling requirements for carbon dioxide, solid (dry ice).

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Handling requirements for carbon dioxide, solid (dry ice). 175.900 Section... § 175.900 Handling requirements for carbon dioxide, solid (dry ice). Carbon dioxide, solid (dry ice) when...

  4. 49 CFR 175.900 - Handling requirements for carbon dioxide, solid (dry ice).

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Handling requirements for carbon dioxide, solid (dry ice). 175.900 Section... § 175.900 Handling requirements for carbon dioxide, solid (dry ice). Carbon dioxide, solid (dry ice) when...

  5. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...food coatings. 175.230 Section 175.230 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) INDIRECT FOOD ADDITIVES: ADHESIVES AND COMPONENTS OF COATINGS...

  6. Structure of Chloramphenicol Acetyltransferase at 1.75- angstrom Resolution

    Microsoft Academic Search

    Andrew G. W. Leslie; Peter C. E. Moody; William V. Shaw

    1988-01-01

    Chloramphenicol acetyltransferase [acetylCoA:chloramphenicol O3-acetyltransferase; EC 2.3.1.28] is the enzyme responsible for high-level bacterial resistance to the antibiotic chloramphenicol. It catalyzes the transfer of an acetyl group from acetyl CoA to the primary hydroxyl of chloramphenicol. The x-ray crystallographic structure of the type III variant enzyme from Escherichia coli has been determined and refined at 1.75- angstrom resolution. The enzyme is

  7. Bis(pentamethylcyclopentadienyl) ytterbium: Electron-transfer reactions with organotransition metal complexes

    SciTech Connect

    Matsunaga, P.T.

    1991-11-01

    The divalent lanthanide complex, (Me{sub 5}C{sub 5}){sub 2}Yb, reacts with methylcopper to produce the base-free, ytterbium-methyl complex, (Me{sub 5}C{sub 5}){sub 2}YbMe. This product forms a asymmetric, methyl-bridged dimer in the solid state. The bulky alkyl complex, (Me{sub 5}C{sub 5}){sub 2}YbCH(SiMe{sub 3}){sub 2}, displays similar chemistry to (Me{sub 5}C{sub 5}){sub 2}YbMe, but at a reduced reaction rate due to the limited accessibility of the metal in (Me{sub 5}C{sub 5}){sub 2}YbCH(SiMe{sub 3}){sub 2}. Copper and silver halide salts react with (Me{sub 5}C{sub 5}){sub 2}V to produce the trivalent halide derivatives, (Me{sub 5}C{sub 5}){sub 2}VX (X + F, Cl, Br, I). The chloride complex, (Me{sub 5}C{sub 5}){sub 2}VCl, reacts with lithium reagents to form the phenyl and borohydride species. Nitrous oxide transfers an oxygen atom to (Me{sub 5}C{sub 5}){sub 2}V producing the vanadium-oxo complex, (Me{sub 5}Ce{sub 5}){sub 2}VO. The trivalent titanium species, (Me{sub 5}C{sub 5}){sub 2}TiX (X = Cl, Br, Me, BH{sub 4}), form bimetallic coordination complexes with (Me{sub 5}C{sub 5}){sub 2}Yb. The magnetic behavior of the products indicates that electron transfer has not occurred. The solid state structures of the chloride and bromide complexes show unusual bend angles for the halide bridges between ytterbium and titanium. A model based on frontier orbital theory has been proposed to account for the bending behavior in these species. The bimetallic methyl complex contains a linear methyl bridge between ytterbium and titanium.

  8. 45 CFR 286.175 - What special provisions apply in Alaska?

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false What special provisions apply in Alaska? 286.175 Section 286.175 Public Welfare...286.175 What special provisions apply in Alaska? A Tribe in the State of Alaska that receives a TFAG must use the grant to...

  9. 45 CFR 286.175 - What special provisions apply in Alaska?

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2012-10-01 true What special provisions apply in Alaska? 286.175 Section 286.175 Public Welfare...286.175 What special provisions apply in Alaska? A Tribe in the State of Alaska that receives a TFAG must use the grant to...

  10. 45 CFR 286.175 - What special provisions apply in Alaska?

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false What special provisions apply in Alaska? 286.175 Section 286.175 Public Welfare...286.175 What special provisions apply in Alaska? A Tribe in the State of Alaska that receives a TFAG must use the grant to...

  11. 45 CFR 286.175 - What special provisions apply in Alaska?

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false What special provisions apply in Alaska? 286.175 Section 286.175 Public Welfare...286.175 What special provisions apply in Alaska? A Tribe in the State of Alaska that receives a TFAG must use the grant to...

  12. 45 CFR 286.175 - What special provisions apply in Alaska?

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2012-10-01 true What special provisions apply in Alaska? 286.175 Section 286.175 Public Welfare...286.175 What special provisions apply in Alaska? A Tribe in the State of Alaska that receives a TFAG must use the grant to...

  13. Subpicosecond SESAM and nonlinear polarization evolution hybrid mode-locking ytterbium-doped fiber oscillator

    NASA Astrophysics Data System (ADS)

    Li, Pingxue; Zhao, Ziqiang; Zhang, Mengmeng; Liang, Boxing; Chi, Junjie; Yang, Chun; Zhang, Guangju; Hu, Haowei; Yao, Yifei; Ma, Chunmei

    2015-03-01

    We report on a high-power 960-fs subpicosecond pulse generation from a passively mode-locked ytterbium-doped large-mode-area photonic crystal fiber oscillator in the all-normal dispersion regime. Stable and self-starting operation is obtained by exploiting an efficient combination of a high modulation depth semiconductor saturable absorber mirror and the nonlinear polarization evolution mode-locking mechanism. In the single-pulse regime, the laser directly generates the output power of 3.15 W at the repetition rate of 83.7 MHz, corresponding to the pulse energy of 37 nJ. The center wavelength is 1,030 nm with the spectral bandwidth of 8 nm at the maximum output power. The output characteristics of the oscillator are discussed carefully.

  14. Principal physical problems in laser separation of weighable amounts of a rare ytterbium isotope

    SciTech Connect

    Yakovlenko, Sergei I [A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

    1998-11-30

    A review is provided of the work on laser separation of Yb isotopes, carried out at the Institute of General Physics of the Russian Academy of Sciences and at the 'Lad' Scientific - Production Enterprise during the last 4 - 5 years. The processes of Yb isotope separation by the AVLIS (atomic vapour laser isotope separation) method were investigated both theoretically (by computer simulation) and experimentally. The main topics considered in the review are the ionisation selectivity, the formation of laser beams and of vapour flow in the cavity, and the extraction of ions from a plasma. A facility for producing highly enriched {sup 168}Yb on an industrial scale is described. The rate of production of the enriched ytterbium is now 5 - 10 mg h{sup -1} (over 1 g per month). Commercially viable production of the enriched {sup 168}Yb isotope by the AVLIS method was achieved for the first time anywhere in the world. (review)

  15. High-Resolution Photoassociation Spectroscopy of Ultracold Ytterbium Atoms by Using the Intercombination Transition

    NASA Astrophysics Data System (ADS)

    Tojo, Satoshi; Kitagawa, Masaaki; Enomoto, Katsunari; Kato, Yutaka; Takasu, Yosuke; Kumakura, Mitsutaka; Takahashi, Yoshiro

    2006-04-01

    We observed high-resolution photoassociation spectra of laser-cooled ytterbium (Yb) atoms in the spin-forbidden S01-P13 intercombination line. The rovibrational levels in the 0u+ state were measured for red detunings of the photoassociation laser ranging from 2.9 MHz to 1.97 GHz with respect to the atomic resonance. The rotational splitting of the vibrational levels near the dissociation limit were fully resolved due to the sub-MHz linewidth of the spectra in contrast to previous measurements using the spin-allowed singlet transition. In addition, from a comparison between the spectra of Yb174 and those of Yb176, a d-wave shape resonance for Yb174 is strongly suggested.

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

    NASA Astrophysics Data System (ADS)

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

    2002-04-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    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.

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

    NASA Astrophysics Data System (ADS)

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

    2014-10-01

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

  19. Two-Color Magneto-Optical Trap with Small Magnetic Field for Ytterbium

    E-print Network

    Kawasaki, Akio; Yu, QinQin; Vuleti?, Vladan

    2015-01-01

    We report a two-color magneto-optical trap (MOT) for ytterbium atoms operating at a low magnetic field gradient down to 2 G/cm where a conventional MOT using the singlet transition (6s^2 1S0 -> 6s6p 1P1) is unable to trap atoms. By simultaneously applying laser light on both the broad-linewidth singlet transition and the narrow-linewidth triplet transition (6s^2 1S0 -> 6s6p 3P1), we load and trap 4.0 x 10^5 atoms directly from an atomic beam at 700 K. In the two-color MOT, the slowing and trapping functions are separately performed by the singlet transition light and the triplet transition light, respectively. The two-color MOT is highly robust against laser power imbalance even at very low magnetic field gradients.

  20. High-power continuous-wave ytterbium-doped fiber oscillator at 1018 nm

    NASA Astrophysics Data System (ADS)

    Zhang, Renli; Xue, Yuhao; Zhang, Hong; Feng, Xiaobo; Gong, Wupeng; Bi, Yong

    2014-11-01

    We have demonstrated a 1018 nm continuous wave fiber oscillator pumped by LDs operating at 976 nm. Three kinds of Ytterbium-doped dual-clad fibers, 15/130 ?m fiber, 25/250 ?m fiber and 30/250 ?m fiber, are employed separately in the experiments. We achieve 67 W total output power with the 15/130 ?m fiber for 100 W of pump power with a slope efficiency of 67%. And with the 25/250 ?m fiber, 276 W total output power is generated for 372 W of pump power with a slope efficiency of 74%. In the end, 300 W output power with the slope efficiency of 81% is successfully achieved with the 30/250 ?m fiber for 372 W of pump power. To the best of our knowledge, this is the highest output ever reached by a dual-clad fiber oscillator at this wavelength that ever reported in open detail.

  1. Subpicosecond SESAM and nonlinear polarization evolution hybrid mode-locking ytterbium-doped fiber oscillator

    NASA Astrophysics Data System (ADS)

    Li, Pingxue; Zhao, Ziqiang; Zhang, Mengmeng; Liang, Boxing; Chi, Junjie; Yang, Chun; Zhang, Guangju; Hu, Haowei; Yao, Yifei; Ma, Chunmei

    2015-02-01

    We report on a high-power 960-fs subpicosecond pulse generation from a passively mode-locked ytterbium-doped large-mode-area photonic crystal fiber oscillator in the all-normal dispersion regime. Stable and self-starting operation is obtained by exploiting an efficient combination of a high modulation depth semiconductor saturable absorber mirror and the nonlinear polarization evolution mode-locking mechanism. In the single-pulse regime, the laser directly generates the output power of 3.15 W at the repetition rate of 83.7 MHz, corresponding to the pulse energy of 37 nJ. The center wavelength is 1,030 nm with the spectral bandwidth of 8 nm at the maximum output power. The output characteristics of the oscillator are discussed carefully.

  2. Tapered inner-cladding fiber design for uniform heat deposition in Ytterbium-doped fiber amplifiers

    NASA Astrophysics Data System (ADS)

    Huang, Zhihua; Zhang, Yongliang; Deng, Ying; Lin, Honghuan; Li, Qi; Zhao, Lei; Wang, Jianjun

    2015-04-01

    A method for designing double-clad fiber with tapered inner cladding and uniform core is proposed for linear pump power profile, i.e. uniform heat deposition, in the ytterbium-doped fiber amplifier. The analytical formula for the inner-cladding diameter profile along the fiber is given. The inner-cladding diameter near the pump injection port is determined purely by the diameter of the doped region, the number density of the doped ions, the absorption cross section at the pump wavelength and the length of the fiber. The simplified linearly varying inner-cladding diameter is proven to have a smoother heat deposition profile with lower maximum thermal load in both the co-pumping scheme and the counter-pumping scheme.

  3. Intense upconversion luminescence in ytterbium-sensitized thulium-doped novel oxychloride bismuth germanium glass

    NASA Astrophysics Data System (ADS)

    Sun, Hongtao; Yu, Chunlei; Zhang, Liyan; Duan, Zhongchao; He, Dongbin; Zhang, Junjie; Hu, Lili; Jiang, Zhonghong

    2005-06-01

    Structural and up-conversion fluorescence properties in ytterbium-sensitized thulium-doped novel oxychloride bismuth-germanium glass have been studied. The structure of novel bismuth-germanium glass was investigated by peak-deconvolution of Raman spectrum, and the structural information was obtained from the peak wave numbers. The Raman spectrum investigation indicates that PbCl 2 plays an important role in the formation of glass network, and has an important influence on the up-conversion luminescence. Intense blue and weak red emissions centered at 477 and 650 nm, corresponding to the transitions 1G 4? 3H 6 and 1G 4? 3H 4, respectively, were observed at room temperature. The possible up-conversion mechanisms are discussed and estimated. This novel oxychloride bismuth-germanium glass with low maximum phonon energy (˜730 cm -1) can be used as potential host material for up-conversion lasers.

  4. Intense upconversion luminescence in ytterbium-sensitized thulium-doped oxychloride germanate glass

    NASA Astrophysics Data System (ADS)

    Sun, Hongtao; Zhanga, Liyan; Zhang, Junjie; Wen, Lei; Yu, Chunlei; Duan, Zhongchao; Dai, Shixun; Hu, Lili; Jiang, Zhonghong

    2005-04-01

    Structural and upconversion fluorescence properties in ytterbium-sensitized thulium-doped oxychloride germanate glass have been studied. The structure of oxychloride germanate glass was investigated by peak-deconvolution of Raman spectrum, and the structural information was obtained from the peak wavenumbers. The Raman spectrum investigation indicates that PbCl 2 plays an important role in the formation of glass network, and has an important influence on the upconversion luminescence. Intense blue and weak red emissions centered at 477 and 650 nm, corresponding to the transitions 1G 4? 3H 6 and 1G 4? 3H 4, respectively, were observed at room temperature. The possible upconversion mechanisms are discussed and estimated. Intense upconversion luminescence indicates that oxychloride germanate glass can be used as potential host material for upconversion lasers.

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

    NASA Astrophysics Data System (ADS)

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

    2015-02-01

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

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

    E-print Network

    Toshiyuki Hosoya; Martin Miranda; Ryotaro Inoue; Mikio Kozuma

    2014-12-02

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

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

    NASA Astrophysics Data System (ADS)

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

    2015-02-01

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

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

    SciTech Connect

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

    2014-10-21

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

  9. 146W continuous wave ytterbium doped fiber amplifier at 1009 nm

    NASA Astrophysics Data System (ADS)

    Beier, F.; Otto, H.-J.; Sattler, B.; Ploetner, M.; Haarlammert, N.; de Vries, O.; Jauregui, C.; Schreiber, T.; Limpert, J.; Eberhardt, R.; Tünnermann, A.

    2014-03-01

    In this contribution we demonstrate a single mode continuous wave laser amplifier with 146 W of power at a wavelength of 1009 nm. On one hand this experiments constitutes an extension of the wavelength range of high power fiber lasers, furthermore, emission wavelength well below 1030 nm find use for efficient high-brightness tandem pumping of high power fiber amplifiers. The wavelength and bandwidth of the seed oscillator are defined by a pair of fiber Bragg gratings. This seed is amplified in a two-stage Ytterbium-doped rod-type amplifier to 146 W with a high slope efficiency of 64 %, an excellent beam quality and an ASE-suppression as high as 63 dB.

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

    SciTech Connect

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

    2002-04-15

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

  11. Erbium-ytterbium doped fiber amplifier with suppressed Yb-ASE and improved efficiency

    NASA Astrophysics Data System (ADS)

    Sobon, Grzegorz; Sliwinska, Dorota; Kaczmarek, Pawel; Abramski, Krzysztof M.

    2013-01-01

    A new design of an erbium-ytterbium doped fiber amplifier is demonstrated. The amplifier contains a wavelength-tuned loop resonator for the 1 ?m signal. The amplified spontaneous emission (ASE) from Yb ions is used to stimulate a laser emission at several wavelengths from the 1 ?m band in the 1550 nm amplifier. The wavelength of this lasing is selected by introducing a spectral filter. The results show, that the efficiency of the amplifier at nominal 1550 nm wavelength can be increased by introducing a feedback loop with 1040 nm and 1050 nm filters. This loop also protects the Er-Yb amplifier from parasitic lasing and allows output power scaling without risk of self-pulsing at 1 ?m.

  12. High output power Erbium-Ytterbium doped cladding pumped fiber amplifier

    NASA Astrophysics Data System (ADS)

    Harun, S. W.; Moghaddam, M. R. A.; Ahmad, H.

    2010-10-01

    The performance of a high output power Erbium-Ytterbium doped fiber amplifier (EYDFA) pumped by a 927 nm laser diode are proposed and experimentally investigated. The EYDFA provides a flat gain and output power higher than 23 dBm in the wavelength region from 1545 to 1566 nm using a double-pass configuration. A broadband fiber Bragg grating is used in the double-pass EYDFA to allow a double-propagation of the test signal in the gain medium and thus improves the gain and output power characteristics of the amplifier. The maximum output power of 390 mW is obtained at the maximum 927 nm pump power of 4.1 W which translates to a power conversion efficiency of about 10%.

  13. Arc fusion splicing effects in large-mode-area single-mode ytterbium-doped fibers.

    PubMed

    Feng, Ting; Jenkins, Micah H; Yan, Fengping; Gaylord, Thomas K

    2013-11-10

    For the first time the effects of arc fusion splicing on the residual stress and refractive index of large-mode-area single-mode ytterbium-doped fibers (YDFs) are investigated using a state-of-the-art three-dimensional concurrent stress-index measurement method. The results, based on a commercially available fiber, describe a host of perturbations that decrease the core/cladding refractive index difference by as much as 1.74 × 10(-3) over an axial length of many hundreds of wavelengths. Simulations indicate that these perturbations result in an expansion of the mode-field-diameter by 39.6% and, based on the measured sample, result in an extra splice loss of 20.8%. The results of this investigation will be useful in the design and optimization of high-power all-fiber YDF lasers and amplifiers. PMID:24216728

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

    SciTech Connect

    Schwartz, D.J.

    1995-07-01

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

  15. 12 CFR 225.175 - What risk management, record keeping and reporting policies are required to make merchant banking...

    Code of Federal Regulations, 2010 CFR

    2010-01-01

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

  16. Power scaling long-wavelength ytterbium-doped silica fiber lasers for frequency doubling to yellow

    NASA Astrophysics Data System (ADS)

    Sinha, Supriyo

    Ytterbium-doped silica fiber lasers and amplifiers operating at very long wavelengths were designed and demonstrated for frequency doubling to the yellow. Obtaining efficient oscillation and amplification at these long wavelengths in Yb3+-doped silica is difficult due to the low available gain and gain competition from shorter wavelengths with higher emission cross-sections. These challenges led us to develop techniques to mitigate photodarkening and maximize the suppression of amplified spontaneous emission (ASE) in silica fiber with high levels of ytterbium doping. These advances resulted in the development of an integrated fiber oscillator operating at 1150 nm with 213 mW of CW output power with a full-width half-maximum linewidth of 8 pm and a polarization extinction ratio of 21 dB. Using additional ASE management techniques, we developed a fiber amplifier that scaled the oscillator power to 3.35 W CW and 2.25 W of average power in microsecond pulses. The CW amplifier output power was frequency doubled in a periodically poled lithium niobate (PPLN) waveguide to produce 255 mW of power at 575 nm. The output of the microsecond-pulse amplifier was frequency doubled in a bulk periodically poled near-stoichiometric lithium tantalate (PPSLT) chip to nearly 1 W of average power. In addition to generating yellow radiation, issues in scaling to higher average and peak powers in fiber amplifiers were studied. In particular, the noise characteristics of large-mode area (LMA) fiber amplifiers were investigated and the use of silicate bonding to mitigate damage to fiber ends and minimize feedback was explored.

  17. Single-frequency ytterbium-doped fiber laser at 976 nm

    NASA Astrophysics Data System (ADS)

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

    2013-02-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    2014-12-01

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

  19. The dawn of computer-assisted robotic osteotomy with ytterbium-doped fiber laser.

    PubMed

    Sotsuka, Yohei; Nishimoto, Soh; Tsumano, Tomoko; Kawai, Kenichiro; Ishise, Hisako; Kakibuchi, Masao; Shimokita, Ryo; Yamauchi, Taisuke; Okihara, Shin-ichiro

    2014-05-01

    Currently, laser radiation is used routinely in medical applications. For infrared lasers, bone ablation and the healing process have been reported, but no laser systems are established and applied in clinical bone surgery. Furthermore, industrial laser applications utilize computer and robot assistance; medical laser radiations are still mostly conducted manually nowadays. The purpose of this study was to compare the histological appearance of bone ablation and healing response in rabbit radial bone osteotomy created by surgical saw and ytterbium-doped fiber laser controlled by a computer with use of nitrogen surface cooling spray. An Ytterbium (Yb)-doped fiber laser at a wavelength of 1,070 nm was guided by a computer-aided robotic system, with a spot size of 100 ?m at a distance of approximately 80 mm from the surface. The output power of the laser was 60 W at the scanning speed of 20 mm/s scan using continuous wave system with nitrogen spray level 0.5 MPa (energy density, 3.8 × 10(4) W/cm(2)). Rabbits radial bone osteotomy was performed by an Yb-doped fiber laser and a surgical saw. Additionally, histological analyses of the osteotomy site were performed on day 0 and day 21. Yb-doped fiber laser osteotomy revealed a remarkable cutting efficiency. There were little signs of tissue damage to the muscle. Lased specimens have shown no delayed healing compared with the saw osteotomies. Computer-assisted robotic osteotomy with Yb-doped fiber laser was able to perform. In rabbit model, laser-induced osteotomy defects, compared to those by surgical saw, exhibited no delayed healing response. PMID:24241973

  20. Multi-pulses dynamic patterns in a topological insulator mode-locked ytterbium-doped fiber laser

    NASA Astrophysics Data System (ADS)

    Peiguang, Yan; Rongyong, Lin; Han, Zhang; Zhiteng, Wang; Han, Chen; Shuangchen, Ruan

    2015-01-01

    Multi-pulse dynamic patterns have been experimentally observed in an Ytterbium-doped fiber laser passively mode locked by a topological insulator (TI) Bi2Te3 saturable absorber (SA). The fundamental mode-locking operation with a repetition rate of ~1.10 MHz was achieved under a pump power of ~160 mW with an appropriate setting of the polarization controller (PC). It was found that through either changing the pump power or rotating the orientation of intra-cavity PC, several characteristic modes have been experimentally observed, including disordered multi-pulses, bunch of pulses, and soliton rains. Simultaneously, quasi-square pulses have also been observed in the laser cavity. Our systematic study clearly demonstrated that TI could be developed as an effective SA for the generation of different pulse operation states in a passively mode-locked all-normal-dispersion Ytterbium-doped fiber laser.

  1. High-power 100-fs pulse generation by frequency doubling of an erbium ytterbium-fiber master oscillator power amplifier.

    PubMed

    Hofer, M; Fermann, M E; Galvanauskas, A; Harter, D; Windeler, R S

    1998-12-01

    Frequency doubling of an erbium-ytterbium-fiber master-oscillator-power-amplifier system is demonstrated. Simultaneous amplification and pulse compression in multimode erbium-ytterbium-doped fibers produces high-quality near-diffraction and near-bandwidth-limited 100-fs pulses at a wavelength of 1.62microm with an average power of 230 mW at a repetition rate of 52 MHz. Periodically poled LiNbO(3) allows for frequency doubling with a conversion efficiency of 51%, producing near-bandwidth-limited 105-fs pulses with an average power of 117 mW and a pulse energy of 2.3 nJ at a wavelength of 810 nm. PMID:18091931

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

    SciTech Connect

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

    2013-04-15

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

  3. 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.

  4. Synthesis of nanocrystalline ytterbium-doped yttria by citrate-gel combustion method and fabrication of ceramic materials

    Microsoft Academic Search

    Nengli Wang; Xiyan Zhang; Zhaohui Bai; Haiying Sun; Quansheng Liu; Liping Lu; Xiaoyun Mi; Xiaochun Wang

    2011-01-01

    Nanosized ytterbium doped yttria powders were prepared by citrate-gel combustion techniques. As-synthesized precursor and calcined powders were characterized for their crystalline structure, particle size and morphologies. Nanocrystalline Yb3+:Y2O3 powders with pure cubic yttria crystal structure were obtained by calcination of as-prepared precursors at 1100°C for 3h. Powders obtained were well dispersed with an average particle size of 60nm. By using

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

    PubMed

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

    2008-08-21

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

  6. Erbium:Ytterbium Codoped Large-Core Fiber Laser With 297-W Continuous-Wave Output Power

    Microsoft Academic Search

    Yoonchan Jeong; Seongwoo Yoo; C. A. Coderaard; Johan Nilsson; Jayanta K. Sahu; David N. Payne; R. Horley; P. W. Turner; Louise Hickey; Andrew Harker; Mike Lovelady; Andy Piper

    2007-01-01

    We have demonstrated a high-power and high-efficiency erbium:ytterbium (Er:Yb) codoped fiber laser that produces 297 W of continuous-wave output at 1567 nm. The slope efficiency with respect to the launched pump power changed from 40% to 19% at higher output power due to the onset of Yb colasing at 1067 nm. However, the Yb colasing was essential for the suppression

  7. High-power and tunable operation of erbium-ytterbium co-doped cladding-pumped fiber lasers

    Microsoft Academic Search

    Johan Nilsson; Shaif-Ul Alam; Jose A. Alvarez-Chavez; Paul W. Turner; W. Andrew Clarkson; Anatoly B. Grudinin

    2003-01-01

    We describe erbium-ytterbium co-doped fiber lasers in different free-running and tunable configurations. The lasers were cladding-pumped by high-power multimode diode sources. We compare pumping at 915 and 980 nm. With a free-running laser, we obtained slope efficiencies of up to 50% with 915-nm pumping and 38% with 980-nm pumping, with respect to absorbed pump power. We reached a double-ended output

  8. Light propagation in the multi-mode double-clad erbium: ytterbium co-doped fiber: theory and experiment

    Microsoft Academic Search

    Guijin Xia; Jinghan Duan; Shanghong Zhao; Shufu Dong

    2004-01-01

    The pump light and forward- and backward-amplified spontaneous emissions (ASE±) propagation in the multi-mode double-clad erbium: ytterbium co-doped fiber are analyzed numerically and measured experimentally. And the light propagation in hexagonal inner cladding based on geometrical optics are analyzed comprehensibly. We obtained that the suitable length of the fiber in optical fiber lasers is 2–2.5m, and the 2m long fiber

  9. 1.5 cm long single mode fiber laser made by femtosecond exposure of heavily doped erbium-ytterbium fiber

    Microsoft Academic Search

    Dan Grobnic; Stephen J. Mihailov; Christopher W. Smelser; Robert B. Walker

    2007-01-01

    The fabrication of a very short fiber laser made in heavily doped (0.23 wt% Er3+, 2.5 wt% Yb3+) Erbium-Ytterbium silica fiber is presented. The laser cavity is built by inscribing two identical Bragg gratings 8 mm apart as cavity mirrors using ultrafast femtosecond radiation from an infrared regenerative amplifier and the phase mask method. The fiber Bragg gratings have a

  10. Erbium\\/ytterbium co-doped double clad fiber amplifier, its applications and effects in fiber optic communication systems

    Microsoft Academic Search

    Puneit Dua

    2005-01-01

    Increased demand for larger bandwidth and longer inter-amplifiers distances translates to higher power budgets for fiber optic communication systems in order to overcome large splitting losses and achieve acceptable signal-to-noise ratios. Due to their unique design ytterbium sensitized erbium doped, double clad fiber amplifiers; offer significant increase in the output powers that can be obtained. In this thesis we investigate,

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

    NASA Astrophysics Data System (ADS)

    Bayramian, Andrew James

    2000-11-01

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

  12. The National Kidney Registry: 175 transplants in one year.

    PubMed

    Veale, Jeffrey; Hil, Garet

    2011-01-01

    Since organizing its first swap in 2008, the National Kidney Registry had facilitated 389 kidney transplants by the end of 2011 across 45 U.S. transplant centers. Rapid innovations, advanced computer technologies, and an evolving understanding of the processes at participating transplant centers and histocompatibility laboratories are among the factors driving the success of the NKR. Virtual cross match accuracy has improved from 43% to 94% as a result of improvements in the HLA typing process for donor antigens and enhanced mechanisms to list unacceptable HLA antigens for sensitized patients. By the end of 2011, the NKR had transplanted 66% of the patients enrolled since 2008. The 2011 wait time (from enrollment to transplant) for the 175 patients transplanted that year averaged 5 months. PMID:22755419

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

    NASA Astrophysics Data System (ADS)

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

    2015-03-01

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

  14. All-fiber Q-switched ytterbium-doped fiber laser in MOPA configurations

    NASA Astrophysics Data System (ADS)

    He, Wei; Zhu, Lianqing; Zhang, Yinmin; Dong, Mingli; Chen, Xiaohuai

    2013-10-01

    An all fiber Q-switched Ytterbium-Doped Fiber "YDF" laser in Master Oscillator Power-Amplifier (MOPA) configuration is proposed theoretically and demonstrated experimentally, and the principle analysis and experimental verification are presented in details. Firstly, the system configuration is designed. The system is composed of the seed and the amplifier stage. Two 915nm LDs are used for pumping light, and the light is coupled into the gain medium of the seed and the amplifier stage by two combiners, respectively. Two Fiber Bragg Gratings (FBGs) are used as ends of the cavity of the seed. One Q-switch is used to modulate output laser of the seed, and the amplifier stage is adopted to amplify the light behind the seed. Then, 10m YDF with single mode is selected for the gain medium of the seed, and 8m YDF with multimode is used as the gain medium of the amplifier stage. The output laser of the seed with a 1.02W average power is realized when the seed pump power is 5.74W, the repetition rate is 20KHz and the action time of the Q-switch is 3.5?s. Meanwhile, a 7.58W pump power of the amplifier stage is used to amplify the seed laser. Finally, output laser with the pulse width of 90ns and the average output power of 4.93W are achieved.

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

    SciTech Connect

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

    2011-02-11

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

  16. Laser system for Doppler cooling of ytterbium ion in an optical frequency standard

    NASA Astrophysics Data System (ADS)

    Chepurov, S. V.; Lugovoy, A. A.; Kuznetsov, S. N.

    2014-06-01

    A laser system for Doppler cooling of ytterbium ion on the 2S1/2 ? 2P1/2 transition in a single-ion optical frequency standard is developed. The second harmonic of a semiconductor laser with a wavelength of 739 nm is used for cooling. The laser frequency is doubled in a nonlinear BiBO crystal embedded in a ring resonator, which also serves as a reference for laser frequency stabilisation. Second-harmonic power of ~100 ?W is generated at a wavelength of 369.5 nm. Diode laser radiation is modulated by an electro-optic modulator at 14.75 GHz to generate a sideband exciting the 2S1/2 (F = 0) ? 2P1/2 (F = 1) hyperfine component of the cooling transition that is not excited by resonant cooling light. The sideband relative intensity of a few percent proved to be sufficient to reduce the ion dwelling time in the 2S1/2 (F = 0) state to less than 10-4 s and increase the cooling efficiency.

  17. Evaluation of allelic forms of the erythrocyte binding antigen 175 (EBA-175) in Plasmodium falciparum field isolates from Brazilian endemic area

    PubMed Central

    2011-01-01

    Background The Plasmodium falciparum Erythrocyte Binding Antigen-175 (EBA-175) is an antigen considered to be one of the leading malaria vaccine candidates. EBA-175 mediates sialic acid-dependent binding to glycophorin A on the erythrocytes playing a crucial role during invasion of the P. falciparum in the host cell. Dimorphic allele segments, termed C-fragment and F-fragment, have been found in high endemicity malaria areas and associations between the dimorphism and severe malaria have been described. In this study, the genetic dimorphism of EBA-175 was evaluated in P. falciparum field isolates from Brazilian malaria endemic area. Methods The study was carried out in rural villages situated near Porto Velho, Rondonia State in the Brazilian Amazon in three time points between 1993 and 2008. The allelic dimorphism of the EBA-175 was analysed by Nested PCR. Results The classical allelic dimorphism of the EBA-175 was identified in the studied area. Overall, C-fragment was amplified in a higher frequency than F-fragment. The same was observed in the three time points where C-fragment was observed in a higher frequency than F-fragment. Single infections (one fragment amplified) were more frequent than mixed infection (two fragments amplified). Conclusions These findings confirm the dimorphism of EBA175, since only the two types of fragments were amplified, C-fragment and F-fragment. Also, the results show the remarkable predominance of CAMP allele in the studied area. The comparative analysis in three time points indicates that the allelic dimorphism of the EBA-175 is stable over time. PMID:21615944

  18. Dual-stage erbium-doped, erbium/ytterbium-codoped fiber amplifier with up to +26-dBm output power and a 17-nm flat spectrum.

    PubMed

    Wysocki, P F; Park, N; Digiovanni, D

    1996-11-01

    By concatenating an aluminum-codoped erbium-doped fiber with an efficient erbium/ytterbium-codoped fiber, we produce a gain spectrum that is f lat within 0.5 dB for 17 nm from 1544 to 1561 nm. By using energy transfer between erbium and ytterbium ions, we are able to pump the second stage with a high-power 1064-nm source to achieve an output power as high as +26 dBm. Using 980-nm pumping of the first stage, we produce an overall noise figure below 5 dB. PMID:19881787

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

    SciTech Connect

    Mukhopadhyay, Pranab K., E-mail: pkm@rrcat.gov.in; Gupta, Pradeep K.; Singh, Amarjeet; Sharma, Sunil K.; Bindra, Kushvinder S.; Oak, Shrikant M. [Solid State Laser Division, Raja Ramanna Centre for Advanced Technology, Indore, M.P. 452013 (India)] [Solid State Laser Division, Raja Ramanna Centre for Advanced Technology, Indore, M.P. 452013 (India)

    2014-05-15

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

  20. Spectral diagnostics of a vapor-plasma plume produced during welding titanium with a high-power ytterbium fiber laser

    NASA Astrophysics Data System (ADS)

    Uspenskiy, S. A.; Petrovskiy, V. N.; Bykovskiy, D. P.; Mironov, V. D.; Prokopova, N. M.; Tret'yakov, E. V.

    2015-03-01

    This work is devoted to the research of welding plume during high power ytterbium fiber laser welding of a titanium alloy in the Ar shielding gas environment. High speed video observation of a vapor-plasma plume for visualization of processes occurring at laser welding was carried out. The coefficient of the inverse Bremsstrahlung absorption of laser radiation is calculated for a plasma welding plume by results of spectrometer researches. The conclusion deals with the impact of plasma on a high-power fiber laser radiation.

  1. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

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

  2. Artificial Intelligence 175 (2011) 20212060 Contents lists available at ScienceDirect

    E-print Network

    Southampton, University of

    2011-01-01

    Artificial Intelligence 175 (2011) 2021­2060 Contents lists available at ScienceDirect Artificial. In this paper, we argue that techniques from the field of artificial intelligence are instrumental to addressing. Stein et al. / Artificial Intelligence 175 (2011) 2021­2060 services may display significant uncertainty

  3. FIFO Generator v3.2 UG175 September 21, 2006

    E-print Network

    Berns, Hans-Gerd

    , air traffic control, life support, or weapons systems ("High-Risk Applications"). Xilinx specificallyR LogiCORETM FIFO Generator v3.2 User Guide UG175 September 21, 2006 #12;FIFO Generator v3.2 User Guide www.xilinx.com UG175 September 21, 2006 Xilinx is disclosing this Document and Intellectual

  4. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 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...

  5. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 2010-10-01 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...

  6. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 2014-10-01 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...

  7. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 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...

  8. 49 CFR 38.175 - High-speed rail cars, monorails and systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 2013-10-01 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...

  9. 33 CFR 165.T13-175 - Safety Zone; M/V DAVY CROCKETT, Columbia River.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  10. 46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Shipping 1 2013-10-01 2013-10-01 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...

  11. 46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...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...

  12. 46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Shipping 1 2014-10-01 2014-10-01 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...

  13. 46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...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...

  14. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 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...

  15. 21 CFR 175.360 - Vinylidene chloride copolymer coatings for nylon film.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

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

  16. 21 CFR 175.365 - Vinylidene chloride copolymer coatings for polycarbonate film.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...chloride copolymer coatings for polycarbonate film. 175.365 Section 175.365 Food...chloride copolymer coatings for polycarbonate film. Vinylidene chloride copolymer coatings...this section and applied on polycarbonate film may be safely used as food-contact...

  17. 21 CFR 175.365 - Vinylidene chloride copolymer coatings for polycarbonate film.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...chloride copolymer coatings for polycarbonate film. 175.365 Section 175.365 Food...chloride copolymer coatings for polycarbonate film. Vinylidene chloride copolymer coatings...this section and applied on polycarbonate film may be safely used as food-contact...

  18. 21 CFR 175.360 - Vinylidene chloride copolymer coatings for nylon film.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

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

  19. 21 CFR 175.360 - Vinylidene chloride copolymer coatings for nylon film.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

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

  20. 21 CFR 175.360 - Vinylidene chloride copolymer coatings for nylon film.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

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

  1. 21 CFR 175.360 - Vinylidene chloride copolymer coatings for nylon film.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

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

  2. 21 CFR 175.365 - Vinylidene chloride copolymer coatings for polycarbonate film.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...chloride copolymer coatings for polycarbonate film. 175.365 Section 175.365 Food...chloride copolymer coatings for polycarbonate film. Vinylidene chloride copolymer coatings...this section and applied on polycarbonate film may be safely used as food-contact...

  3. 21 CFR 175.365 - Vinylidene chloride copolymer coatings for polycarbonate film.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...chloride copolymer coatings for polycarbonate film. 175.365 Section 175.365 Food...chloride copolymer coatings for polycarbonate film. Vinylidene chloride copolymer coatings...this section and applied on polycarbonate film may be safely used as food-contact...

  4. 21 CFR 175.365 - Vinylidene chloride copolymer coatings for polycarbonate film.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...chloride copolymer coatings for polycarbonate film. 175.365 Section 175.365 Food...chloride copolymer coatings for polycarbonate film. Vinylidene chloride copolymer coatings...this section and applied on polycarbonate film may be safely used as food-contact...

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

    PubMed Central

    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

    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. PMID:21743000

  6. 175Reprod. Nutr. Dev. 45 (2005) 175183 INRA, EDP Sciences, 2005

    E-print Network

    Paris-Sud XI, Université de

    175Reprod. Nutr. Dev. 45 (2005) 175­183 © INRA, EDP Sciences, 2005 DOI: 10.1051/rnd:2005013 and available at http://www.edpsciences.org/rnd or http://dx.doi.org/10.1051/rnd:2005013 #12;176 D. Melchior et

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

    NASA Astrophysics Data System (ADS)

    Herold, Creston David

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

  8. A role for serine-175 in modulating the molecular conformation of calponin.

    PubMed Central

    Jin, J P; Walsh, M P; Sutherland, C; Chen, W

    2000-01-01

    Calponin is an actin filament-associated protein found in smooth muscle and non-muscle cells. Calponin inhibits actin-myosin interaction in a manner that is prevented by protein kinase C (PKC)-catalysed phosphorylation of serine-175. To investigate the molecular basis of serine-175-mediated regulation, we examined the effect of phosphorylation on the conformation of calponin using monoclonal antibody (mAb) epitope analysis. Eight mAbs against different epitopes on chicken gizzard calponin were developed to monitor the conformational changes in calponin induced by PKC-mediated phosphorylation or serine-175-->alanine (S175A) substitution. The relative affinities of the mAbs for calponins immobilized on microtitre plates or bound to actin-tropomyosin thin filaments were determined, and epitope competitions between free and immobilized calponins were carried out. The changes in binding affinity between mAb paratopes and calponin epitopes demonstrate several serine-175 modification-induced conformational effects: (a) structures of calponin are reconfigured by serine-175 modification, supporting the regulatory function of serine-175; (b) there are submolecular structures unaffected by modification of serine-175 in both free and thin filament-associated calponins, suggesting that the serine-175-based conformational modulation is a targeted allosteric effect; (c) significant conformational changes are detected between free and thin filament-associated calponins, indicating two functional states of the molecular conformation; and (d) the different epitope characteristics between thin filament-bound and free calponins suggest that calponin is a flexible molecule, and the modifications of serine-175 may also determine the structural flexibility to increase the epitope accessibility. These results provide novel information concerning the structure-function relationships of calponin and its regulation by phosphorylation. PMID:10947974

  9. UV light from the ground term of Ti-like ytterbium, tungsten, and bismuth J. V. Porto, I. Kink, and J. D. Gillaspy

    E-print Network

    Chantler, Christopher T.

    UV light from the ground term of Ti-like ytterbium, tungsten, and bismuth J. V. Porto, I. Kink, and bismuth. This fills in a gap in previous measurements along this isoelectronic sequence, as well tungsten and bismuth 9 provide strong motivation for measuring them. Electron-beam ion traps EBIT

  10. Ytterbium-and chromium-doped fibre laser: from chaotic self-pulsing to passive Q-switching. Bernard Dussardier1

    E-print Network

    Paris-Sud XI, Université de

    Ytterbium- and chromium-doped fibre laser: from chaotic self-pulsing to passive Q mode of operation using a chromium-doped saturable absorber fibre. This original all-fibre laser-fibre laser", Electron. Lett., 39, 1307 (2003) [iii] V. Felice et al., "Chromium-doped silica optical fibres

  11. 50kW, 100-fs pulse generation by large-mode-area erbium-ytterbium-doped photonic-crystal fiber amplifier

    Microsoft Academic Search

    A. Shirakawa; J. Ota; M. Musha; K. Ueda; J. R. Folkenberg; J. Broeng

    2005-01-01

    A high-energy femtosecond fiber amplifier using a large-mode-area single-mode erbium-ytterbium-codoped photonic-crystal fiber is presented. 700-fs pulses at 1557 nm were amplified and compressed to near-transform-limited 100-fs, 7.4-nJ pulses with >50-kW peak powers without chirped-pulse amplification.

  12. Large-Mode-Area Erbium-Ytterbium-doped Photonic-Crystal Fiber Amplifier yielding 54kW Femtosecond Pulses without Chirped-Pulse Amplification

    Microsoft Academic Search

    A. Shirakawa; M. Musha; K. Ueda; J. R. Folkenberg; J. Broeng

    2005-01-01

    A high-energy femtosecond fiber amplifier using a large-mode-area single-mode erbium-ytterbium-codoped photonic-crystal fiber is presented. 700-fs pulses at 1557nm were amplified and compressed to near-transform-limited 100-fs, 7.4-nJ pulses with > 50-kW peak powers without chirped-pulse amplification.

  13. Structural and functional roles of asparagine 175 in the cysteine protease papain.

    PubMed

    Vernet, T; Tessier, D C; Chatellier, J; Plouffe, C; Lee, T S; Thomas, D Y; Storer, A C; Ménard, R

    1995-07-14

    The role of the asparagine residue in the Cys-His-Asn "catalytic triad" of cysteine proteases has been investigated by replacing Asn175 in papain by alanine and glutamine using site-directed mutagenesis. The mutants were expressed in yeast and kinetic parameters determined against the substrate carbobenzoxy-L-phenylalanyl-(7-amino-4-methylcoumarinyl)- L-arginine. At the optimal pH of 6.5, the specificity constant (k(cat)/KM)obs was reduced by factors of 3.4 and 150 for the Asn175-->Gln and Asn175-->Ala mutants, respectively. Most of this effect was the result of a decrease in k(cat), as neither mutation significantly affected KM. Substrate hydrolysis by these mutants is still much faster than the non-catalytic rate, and therefore Asn175 cannot be considered as an essential catalytic residue in the cysteine protease papain. Detailed analyses of the pH activity profiles for both mutants allow the evaluation of the role of the Asn175 side chain on the stability of the active site ion pair and on the intrinsic activity of the enzyme. Alteration of the side chain at position 175 was also found to increase aggregation and proteolytic susceptibility of the proenzyme and to affect the thermal stability of the mature enzyme, reflecting a contribution of the asparagine residue to the structural integrity of papain. The strict conservation of Asn175 in cysteine proteases might therefore result from a combination of functional and structural constraints. PMID:7622473

  14. 41 CFR 102-192.175 - What types of support does GSA offer to Federal agency mail management programs?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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

  15. 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 ...

  16. 30 CFR 206.175 - How do I determine quantities and qualities of production for computing royalties?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...How do I determine quantities and qualities of production for computing royalties? 206.175 Section 206.175 Mineral Resources...How do I determine quantities and qualities of production for computing royalties? (a) For unprocessed gas, you must...

  17. 49 CFR 175.630 - Special requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious substances) materials. 175.630 Section 175.630 Transportation...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF...

  18. 49 CFR 175.630 - Special requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious...

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious substances) materials. 175.630 Section 175.630 Transportation...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF...

  19. 49 CFR 175.630 - Special requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious substances) materials. 175.630 Section 175.630 Transportation...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF...

  20. 49 CFR 175.630 - Special requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious substances) materials. 175.630 Section 175.630 Transportation...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF...

  1. 49 CFR 175.630 - Special requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious...

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...requirements for Division 6.1 (poisonous) material and Division 6.2 (infectious substances) materials. 175.630 Section 175.630 Transportation...Transportation PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF...

  2. 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

    ... Procedures for adjusting electric power rates to reflect changes in the cost of purchased power or energy. 175.13 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  3. 25 CFR 175.13 - Procedures for adjusting electric power rates to reflect changes in the cost of purchased power...

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... Procedures for adjusting electric power rates to reflect changes in the cost of purchased power or energy. 175.13 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  4. 25 CFR 175.13 - Procedures for adjusting electric power rates to reflect changes in the cost of purchased power...

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... Procedures for adjusting electric power rates to reflect changes in the cost of purchased power or energy. 175.13 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  5. 25 CFR 175.13 - Procedures for adjusting electric power rates to reflect changes in the cost of purchased power...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... Procedures for adjusting electric power rates to reflect changes in the cost of purchased power or energy. 175.13 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  6. 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

    2011-04-01

    ... Procedures for adjusting electric power rates to reflect changes in the cost of purchased power or energy. 175.13 Section 175...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  7. 41 CFR 102-192.175 - What types of support does GSA offer to Federal agency mail management programs?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    41 Public Contracts and Property Management 3 2013-07-01 2013-07-01...does GSA offer to Federal agency mail management programs? 102-192.175 Section...175 Public Contracts and Property Management Federal Property Management...

  8. 41 CFR 102-192.175 - What types of support does GSA offer to Federal agency mail management programs?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    41 Public Contracts and Property Management 3 2012-01-01 2012-01-01...does GSA offer to Federal agency mail management programs? 102-192.175 Section...175 Public Contracts and Property Management Federal Property Management...

  9. Baculovirus-Mediated Expression of Plasmodium falciparum Erythrocyte Binding Antigen 175 Polypeptides and Their Recognition by Human Antibodies

    Microsoft Academic Search

    JON R. DAUGHERTY; CHERYL I. MURPHY; LINDA A. DOROS-RICHERT; ARNOLDO BARBOSA; L. OSCAR KASHALA; W. RIPLEY BALLOU; NORMA J. SNELLINGS; CHRISTIAN F. OCKENHOUSE; DAVID E. LANAR

    1997-01-01

    The erythrocyte binding antigen EBA-175 is a 175-kDa Plasmodium falciparum protein which mediates merozoite invasion of erythrocytes in a sialic acid-dependent manner. The purpose of this study was to produce recombinant EBA-175 polypeptide domains which have previously been identified as being involved in the interaction of EBA-175 with erythrocytes and to determine whether these polypeptides are recognized by malaria-specific antibodies.

  10. 40 CFR 267.175 - What special requirements must I meet for incompatible wastes?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...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...

  11. 40 CFR 267.175 - What special requirements must I meet for incompatible wastes?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...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...

  12. 40 CFR 267.175 - What special requirements must I meet for incompatible wastes?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...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...

  13. 40 CFR 267.175 - What special requirements must I meet for incompatible wastes?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...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...

  14. 40 CFR 267.175 - What special requirements must I meet for incompatible wastes?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...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...

  15. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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

  16. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

  17. 40 CFR 408.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

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

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

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

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  20. 40 CFR 429.175 - Pretreatment standards for existing sources (PSES).

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Pretreatment standards for existing sources (PSES). 429.175...PRODUCTS PROCESSING POINT SOURCE CATEGORY Wood Furniture and Fixture Production With Water Wash Spray Booth(s...Pretreatment standards for existing sources (PSES). Any...

  1. 40 CFR 429.175 - Pretreatment standards for existing sources (PSES).

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...Pretreatment standards for existing sources (PSES). 429.175...PRODUCTS PROCESSING POINT SOURCE CATEGORY Wood Furniture and Fixture Production With Water Wash Spray Booth(s...Pretreatment standards for existing sources (PSES). Any...

  2. 32 CFR 17.5 - Implied duties of the presiding officer.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Implied duties of the presiding officer. 17...ADMINISTRATIVE PROCEDURES § 17.5 Implied duties of the presiding officer...Presiding Officer shall rule on appropriate motions or, at his discretion consistent...

  3. 32 CFR 17.5 - Implied duties of the presiding officer.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Implied duties of the presiding officer. 17...ADMINISTRATIVE PROCEDURES § 17.5 Implied duties of the presiding officer...Presiding Officer shall rule on appropriate motions or, at his discretion consistent...

  4. 40 CFR 81.175 - San Isabel Intrastate Air Quality Control Region.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 2010-07-01 2010-07-01 false San Isabel Intrastate Air Quality Control Region...of Air Quality Control Regions § 81.175 San Isabel Intrastate Air Quality Control Region. The San Isabel Intrastate Air Quality...

  5. 10 CFR 431.175 - Additional requirements applicable to non-Voluntary Independent Certification Program participants.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT Provisions for Commercial Heating, Ventilating, Air-Conditioning and Water Heating Products § 431.175 Additional requirements applicable to non-Voluntary Independent...

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

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 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...

  7. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 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...

  8. 26 CFR 1.175-1 - Soil and water conservation expenditures; in general.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

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

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

  10. 50 CFR 300.175 - Hail-in and hail-out reports.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Albacore Tuna Fisheries § 300.175 Hail-in and hail-out reports. (a) The operator of any U.S. vessel that wishes to...

  11. 50 CFR 300.175 - Hail-in and hail-out reports.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Albacore Tuna Fisheries § 300.175 Hail-in and hail-out reports. (a) The operator of any U.S. vessel that wishes to...

  12. 50 CFR 300.175 - Hail-in and hail-out reports.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Albacore Tuna Fisheries § 300.175 Hail-in and hail-out reports. (a) The operator of any U.S. vessel that wishes to...

  13. 50 CFR 300.175 - Hail-in and hail-out reports.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Albacore Tuna Fisheries § 300.175 Hail-in and hail-out reports. (a) The operator of any U.S. vessel that wishes to...

  14. 50 CFR 300.175 - Hail-in and hail-out reports.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Albacore Tuna Fisheries § 300.175 Hail-in and hail-out reports. (a) The operator of any U.S. vessel that wishes to...

  15. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Environment 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...

  16. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Environment 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...

  17. 40 CFR 417.175 - Standards of performance for new sources.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Environment 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...

  18. 48 CFR 217.175 - Multiyear contracts for electricity from renewable energy sources.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...contracts for electricity from renewable energy sources. 217.175 Section...contracts for electricity from renewable energy sources. (a) The head...electricity from sources of renewable energy, as that term is defined...

  19. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...230 Section 175.230 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION (CONTINUED) INDIRECT FOOD ADDITIVES: ADHESIVES AND COMPONENTS OF COATINGS...

  20. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...230 Section 175.230 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION (CONTINUED) INDIRECT FOOD ADDITIVES: ADHESIVES AND COMPONENTS OF COATINGS...

  1. 21 CFR 175.230 - Hot-melt strippable food coatings.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...230 Section 175.230 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION (CONTINUED) INDIRECT FOOD ADDITIVES: ADHESIVES AND COMPONENTS OF COATINGS...

  2. 29 CFR 4.175 - Meeting requirements for health, welfare, and/or pension benefits.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 true Meeting requirements for health, welfare, and...Compensation Standards § 4.175 Meeting requirements for health, welfare, and...hour on behalf of each service employee. These payments...

  3. 47 CFR 17.5 - Commission consideration of applications for station authorization.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...GENERAL CONSTRUCTION, MARKING, AND LIGHTING OF ANTENNA STRUCTURES General Information § 17.5 Commission consideration...determine whether there is a requirement that the antenna structure in question must be registered with the...

  4. 47 CFR 17.5 - Commission consideration of applications for station authorization.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...GENERAL CONSTRUCTION, MARKING, AND LIGHTING OF ANTENNA STRUCTURES General Information § 17.5 Commission consideration...determine whether there is a requirement that the antenna structure in question must be registered with the...

  5. 47 CFR 17.5 - Commission consideration of applications for station authorization.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...GENERAL CONSTRUCTION, MARKING, AND LIGHTING OF ANTENNA STRUCTURES General Information § 17.5 Commission consideration...determine whether there is a requirement that the antenna structure in question must be registered with the...

  6. 47 CFR 17.5 - Commission consideration of applications for station authorization.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...GENERAL CONSTRUCTION, MARKING, AND LIGHTING OF ANTENNA STRUCTURES General Information § 17.5 Commission consideration...determine whether there is a requirement that the antenna structure in question must be registered with the...

  7. 47 CFR 17.5 - Commission consideration of applications for station authorization.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...GENERAL CONSTRUCTION, MARKING, AND LIGHTING OF ANTENNA STRUCTURES General Information § 17.5 Commission consideration...determine whether there is a requirement that the antenna structure in question must be registered with the...

  8. 46 CFR 7.175 - Alaska Peninsula, AK to Nunivak, AK.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Section 7.175 Shipping COAST GUARD, DEPARTMENT OF HOMELAND...the southernmost extremity of Cape Peirce; thence to the southernmost extremity of Cape Newenham. (c) A line drawn...the southernmost extremity of Cape...

  9. 26 CFR 1.175-2 - Definition of soil and water conservation expenditures.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 2010-04-01 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...

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

    SciTech Connect

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

    2009-06-15

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

  11. Optimal design of a high-power picosecond laser system using a dual-stage ytterbium-doped fibre amplifier

    NASA Astrophysics Data System (ADS)

    You, Yi-Jing; Lin, Chih-Hsuan; Zaytsev, Alexey; Tsai, Feng-Hua; Wang, Chi-Luen; Pan, Ci-Ling

    2013-07-01

    An average power as high as 60 W with 73 W of pumping was achieved for an ytterbium-doped fibre-based dual-stage amplifier (MOFA) system seeded by a diode-pumped solid-state (DPSS) laser. The corresponding optical conversion efficiency is 80%. The laser system generates a steady pulse train with a pulse width of 11 ps at a repetition rate of 250 MHz or a peak power of 21.8 kW. Moreover, the output beam quality M2 ? 1.6. The length and pumping power for the Yb-doped fibres were optimized to suppress stimulated Raman scattering (SRS) and amplified spontaneous emission (ASE) while maintaining desirable output characteristics.

  12. Dual Wavelength Single Longitudinal Mode Ytterbium-Doped Fiber Laser Using a Dual-Tapered Mach-Zehnder Interferometer

    NASA Astrophysics Data System (ADS)

    Ahmad, H.; Salim, M. A. M.; Azzuhri, S. R.; Zulkifli, M. Z.; Harun, S. W.

    2015-03-01

    This paper describes a dual wavelength single longitudinal mode (SLM) demonstration for a proposed ytterbium-doped fiber laser. A dualtapered Mach-Zehnder interferometer (MZI) was inserted into the laser ring cavity setup to ensure a stable dual wavelength and SLM operation. The consequent dual wavelength lasing operation had a wavelength spacing of 0.94 nm and a side mode suppression ratio (SMSR) of 50 dB, with the linewidth of this setup measured as 294.15 kHz. A stability test allowed for a measurement of max power fluctuation as less than 0.8 dB for each wavelength and which was indicative of a stable dual wavelength operation.

  13. Creep Behavior of Hafnia and Ytterbium Silicate Environmental Barrier Coating Systems on SiC/SiC Ceramic Matrix Composites

    NASA Technical Reports Server (NTRS)

    Zhu, Dongming; Fox, Dennis S.; Ghosn, Louis J.; Harder, Bryan

    2011-01-01

    Environmental barrier coatings will play a crucial role in future advanced gas turbine engines because of their ability to significantly extend the temperature capability and stability of SiC/SiC ceramic matrix composite (CMC) engine components, thus improving the engine performance. In order to develop high performance, robust coating systems for engine components, appropriate test approaches simulating operating temperature gradient and stress environments for evaluating the critical coating properties must be established. In this paper, thermal gradient mechanical testing approaches for evaluating creep and fatigue behavior of environmental barrier coated SiC/SiC CMC systems will be described. The creep and fatigue behavior of Hafnia and ytterbium silicate environmental barrier coatings on SiC/SiC CMC systems will be reported in simulated environmental exposure conditions. The coating failure mechanisms will also be discussed under the heat flux and stress conditions.

  14. Multicolor frequency upconversion luminescence in europium/terbium co-doped ytterbium-sensitized fluorogermanate glass excited at 980 nm

    NASA Astrophysics Data System (ADS)

    Silva, James R.; Gouveia-Neto, Artur S.; Bueno, Luciano A.

    2014-02-01

    Glass 80GeO3:10PbF2:10CdF2 triply-doped with europium, terbium, and ytterbium phosphors were synthesized and the energy upconversion luminescence emission properties investigated as a function of NIR excitation power, rare-earth ions content combination, and glass phosphor composition. Multicolor visible luminescence with main emissions peaked around 490, 545, 590, 610, 650, and 700 nm was observed when samples were excited by a diode laser at 980 nm. The up-conversion excitation mechanism for both Eu3+, and Tb3+ excited-states emitting levels was achieved via phononassisted cooperative energy-transfer from pairs of excited Yb3+ ions. White-light emission with CIE-1931 coordinates in the region of low color correlated temperature was obtained for appropriate combination of rare-earth ions content.

  15. A physical model of the photo- and radiation-induced degradation of ytterbium-doped silica optical fibres

    SciTech Connect

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

    2014-10-21

    We propose a model to describe the photo- or/and the radiation-induced darkening of ytterbium-doped silica optical fibers. This model accounts for the well-established experimental features of photo-darkening. Degradation behaviors predicted for fibers pumped in harsh environments are also fully confirmed by experimental data reported in the work by Duchez et al. (this proceeding), which gives a detailed characterization of the interplay between the effects of the pump and those of a superimposed ionizing irradiation (actual operation conditions in space-based applications for instance). In particular, dependences of the darkening build-up on the pump power, the total ionizing dose and the dose rate are all correctly reproduced. The presented model is a ‘sufficient’ one, including the minimal physical ingredients required to reproduce experimental features. Refinements could be proposed to improve, e.g., quantitative kinetics.

  16. High SBS-threshold, narrowband, erbium codoped with ytterbium fiber amplifier pulses frequency-doubled to 770 nm.

    PubMed

    Dilley, C E; Stephen, M A; Savage-Leuchs, M P

    2007-10-29

    We present results of pulsed, narrowband amplification at 1540.6nm using a polarization maintaining, large mode area gain fiber codoped with erbium and ytterbium. At a repetition rate of 55 kHz, 2.9 W of average 1540.6nm power were generated with a pulse duration of 136 ns, corresponding to an SBS free peak power of 360 W. The amplified signal was frequency doubled in peridically poled potassium titanyl phosphate and conversion efficiencies of up to 56% were generated. When varying the repetition rate between 55-150 kHz the conversion efficiency changed from 56% to 35% due to the limited pump power. PMID:19550717

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

    E-print Network

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

    2014-02-06

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

  18. High-power tunable single-frequency single-mode erbium:ytterbium codoped large-core fiber master-oscillator power amplifier source.

    PubMed

    Jeong, Y; Sahu, J K; Soh, D B S; Codemard, C A; Nilsson, J

    2005-11-15

    We present a cladding-pumped single-frequency, single-mode erbium:ytterbium codoped fiber master-oscillator power amplifier source generating up to 151 W of continuous-wave output power at 1563 nm with 33% slope efficiency and 20 dB gain. This source was also tunable and had a stable operation range of 1546 to 1566 nm at an output power level in excess of 125 W. The doped fiber exploited a large-core design for improved power handling and mitigation of stimulated Brillouin scattering. There was no sign of having stimulated Brillouin scattering even at the highest power. Despite a large core (V = 12), the output beam was nearly diffraction limited (M2 = 1.1). The source showed slight rollover at over 100 W of output power because of the onset of emission from ytterbium, centered at 1060 nm. PMID:16315700

  19. Stable multigigahertz pulse-train formation in a short-cavity passively harmonic mode-locked erbium\\/ytterbium fiber laser

    Microsoft Academic Search

    B. C. Collings; K. Bergman; W. H. Knox

    1998-01-01

    We demonstrate a short-cavity erbium -ytterbium fiber laser that is passively mode locked by a saturable Bragg ref lector with a fundamental repetition rate of 235 MHz. The laser operates in the soliton regime and under passive harmonic mode locking with 11 pulses in the cavity and produces output pulse trains at 2.6 GHz with transform-limited 270-fs pulses and 1.6

  20. Phosphate ytterbium-doped single-mode all-solid photonic crystal fiber with output power of 13.8?W.

    PubMed

    Wang, Longfei; He, Dongbing; Feng, Suya; Yu, Chunlei; Hu, Lili; Qiu, Jianrong; Chen, Danping

    2015-01-01

    Single-mode ytterbium-doped phosphate all-solid photonic crystal fiber (AS-PCF) with 13.8?W output power and 32% slope efficiency was reported. By altering the diameter of the rods around the doped core and thus breaking the symmetry of the fiber, a polarization-maintaining AS-PCF with degree of polarization of >85% was also achieved, for the first time to knowledge, in a phosphate PCF. PMID:25684731

  1. Fluorescein and eosin as sensitizing chromophores in near-infrared luminescent ytterbium(III), neodymium(III) and erbium(III) chelates

    Microsoft Academic Search

    Martinus H. V. Werts; Johannes W. Hofstraat; Frank A. J. Geurts; Jan W. Verhoeven

    1997-01-01

    Near-infrared luminescent ytterbium(III), neodymium(III) and erbium(III) chelates containing organic chromophores derived from fluorescein and eosin have been synthesized and studied spectroscopically. The complexes can be efficiently excited with visible light and show intense lanthanide luminescence at low concentrations (2? 10?6 mol l?1) in D2O as a result of energy transfer from the dye moiety to the rare earth ion. Quenching

  2. Phosphate ytterbium-doped single-mode all-solid photonic crystal fiber with output power of 13.8?W

    PubMed Central

    Wang, Longfei; He, Dongbing; Feng, Suya; Yu, Chunlei; Hu, Lili; Qiu, Jianrong; Chen, Danping

    2015-01-01

    Single-mode ytterbium-doped phosphate all-solid photonic crystal fiber (AS-PCF) with 13.8?W output power and 32% slope efficiency was reported. By altering the diameter of the rods around the doped core and thus breaking the symmetry of the fiber, a polarization-maintaining AS-PCF with degree of polarization of >85% was also achieved, for the first time to knowledge, in a phosphate PCF. PMID:25684731

  3. An erbium\\/ytterbium co-doped double-cladding fiber amplifier with 36.4dBm output power

    Microsoft Academic Search

    Zhen Guo Lu; Arnaud Lavigne; Peng Lin; Chander P. Grover

    2004-01-01

    We have described a high-power hybrid fiber amplifier, which comprising an erbium \\/ ytterbium co-doped double-cladding fiber amplifier (EYCDFA) as a post-amplifier and a conventional erbium-doped fiber amplifier (EDFA) as a pre-amplifier. At the signal wavelength of 1550 nm, the signal gains of up to 71 dB and the maximum output powers of 36.4 dBm or 4.37 W have been

  4. High-power tunable single-frequency single-mode erbium:ytterbium codoped large-core fiber master-oscillator power amplifier source

    Microsoft Academic Search

    Y. Jeong; J. K. Sahu; D. B. S. Soh; C. A. Codemard; J. Nilsson

    2005-01-01

    We present a cladding-pumped single-frequency, single-mode erbium:ytterbium codoped fiber master-oscillator power amplifier source generating up to 151 W of continuous-wave output power at 1563 nm with 33% slope efficiency and 20 dB gain. This source was also tunable and had a stable operation range of 1546 to 1566 nm at an output power level in excess of 125 W. The

  5. Phosphate ytterbium-doped single-mode all-solid photonic crystal fiber with output power of 13.8 W

    NASA Astrophysics Data System (ADS)

    Wang, Longfei; He, Dongbing; Feng, Suya; Yu, Chunlei; Hu, Lili; Qiu, Jianrong; Chen, Danping

    2015-02-01

    Single-mode ytterbium-doped phosphate all-solid photonic crystal fiber (AS-PCF) with 13.8 W output power and 32% slope efficiency was reported. By altering the diameter of the rods around the doped core and thus breaking the symmetry of the fiber, a polarization-maintaining AS-PCF with degree of polarization of >85% was also achieved, for the first time to knowledge, in a phosphate PCF.

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

    PubMed Central

    Schoffers, Elke; Kohler, Lars

    2009-01-01

    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. PMID:20160975

  7. Localisation of RA175 (Cadm1), a cell adhesion molecule of the immunoglobulin superfamily, in the mouse testis, and analysis of male infertility in the RA175-deficient mouse.

    PubMed

    Maekawa, M; Ito, C; Toyama, Y; Suzuki-Toyota, F; Fujita, E; Momoi, T; Toshimori, K

    2011-06-01

    RA175, a member of the immunoglobulin superfamily, plays an important role in cell adhesion, and RA175 gene-deficient mice (RA175(-/-) ) show oligoastheno-teratozoospermia. To understand the function of RA175, location in the testis and the morphological features of its spermatogenic cells in RA175(-/-) mice were investigated. Immunohistochemical studies revealed that RA175 immunoreactivity was observed on the cell surface of the spermatogenic cells at specific stages. A strong reaction was detected from type A spermatogonia to pachytene spermatocytes at stage IV and from step 6 to step 16 spermatids during spermatogenesis. From pachytene spermatocytes at stage VI to step 4 spermatids, the reaction was not detected by the enzyme-labelled antibody method and was faintly detected by the indirect immunofluorescence method. Abnormal vacuoles in the seminiferous epithelium, showing exfoliation of germ cells, and ultrastructural abnormality of the elongate spermatids were revealed in the RA175(-/-) testes. Other members of the immunoglobulin superfamily such as basigin, nectin-2 and nectin-3, which have an important role in spermatogenesis, were immunohistochemically detected in the RA175(-/-) testis. These observations indicate a unique expression pattern of RA175 in the testis and provide clues regarding the mechanism of male infertility in the testis. PMID:21486398

  8. The double catalytic triad, Cys25-His159-Asp158 and Cys25-His159-Asn175, in papain catalysis: role of Asp158 and Asn175.

    PubMed

    Wang, J; Xiang, Y F; Lim, C

    1994-01-01

    The 1.65 A X-ray structure of papain, which exhibits a Cys25-His159-Asn175 triad, does not correspond to the catalytically active ion pair state since Cys25 is oxidized to cysteic acid and His159 is predominantly neutral. Thus, stochastic boundary molecular dynamics simulations starting from the 1.65 A X-ray structure of papain have been performed for Cys25 and His159 in the SH-ImH+, SH-Im, S(-)-ImH+ and S(-)-Im states and for Asp158 mutated to Asn, Glu and Gly in the ion pair state. By comparing the resulting averaged structures and analyzing the trajectories of certain interatomic distances, important differences in the active-site geometry of papain have been found. In particular, the initial Cys25(S-)-His159(ImH+)-Asn175(C = O) triad found in the X-ray structure is retained in all the structures except the wild type and Asp158-->Asn ion pair states where there is a conformational transition to form the triad, Cys25(S-)-His159(ImH+)-Asp158(COO-). Both triads, Cys25(S-)-His159(ImH+)-Asp158(COO-) and Cys25(S-)-His159(ImH+)-Asn175(C = O) are postulated to participate in catalysis and their roles are discussed. Thus, catalysis does not take place from a single steric position but a two-state mechanism. PMID:8140097

  9. Mutational Analysis of the Pseudomonas aeruginosa Myovirus ?KZ Morphogenetic Protease gp175

    PubMed Central

    Thomas, Julie A.

    2013-01-01

    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

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

    SciTech Connect

    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

    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.

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

    SciTech Connect

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

    2014-03-01

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

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

    SciTech Connect

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

    2014-01-01

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

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

    NASA Astrophysics Data System (ADS)

    Chun-Lin, Louis Chang

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

  14. 21 CFR 175.380 - Xylene-formaldehyde resins condensed with 4,4?-isopropylidenediphenol-epichlorohydrin epoxy resins.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...4â²-isopropylidenediphenol-epichlorohydrin epoxy resins. 175.380 Section...4?-isopropylidenediphenol-epichlorohydrin epoxy resins. The resins identified...4?-isopropylidenediphenol-epichlorohydrin epoxy resins, to which...

  15. 21 CFR 175.380 - Xylene-formaldehyde resins condensed with 4,4?-isopropylidenediphenol-epichlorohydrin epoxy resins.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...4â²-isopropylidenediphenol-epichlorohydrin epoxy resins. 175.380 Section...4?-isopropylidenediphenol-epichlorohydrin epoxy resins. The resins identified...4?-isopropylidenediphenol-epichlorohydrin epoxy resins, to which...

  16. 21 CFR 175.380 - Xylene-formaldehyde resins condensed with 4,4?-isopropylidenediphenol-epichlorohydrin epoxy resins.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...4â²-isopropylidenediphenol-epichlorohydrin epoxy resins. 175.380 Section...4?-isopropylidenediphenol-epichlorohydrin epoxy resins. The resins identified...4?-isopropylidenediphenol-epichlorohydrin epoxy resins, to which...

  17. 21 CFR 175.380 - Xylene-formaldehyde resins condensed with 4,4?-isopropylidenediphenol-epichlorohydrin epoxy resins.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...4â²-isopropylidenediphenol-epichlorohydrin epoxy resins. 175.380 Section...4?-isopropylidenediphenol-epichlorohydrin epoxy resins. The resins identified...4?-isopropylidenediphenol-epichlorohydrin epoxy resins, to which...

  18. 21 CFR 175.380 - Xylene-formaldehyde resins condensed with 4,4?-isopropylidenediphenol-epichlorohydrin epoxy resins.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...4â²-isopropylidenediphenol-epichlorohydrin epoxy resins. 175.380 Section...4?-isopropylidenediphenol-epichlorohydrin epoxy resins. The resins identified...4?-isopropylidenediphenol-epichlorohydrin epoxy resins, to which...

  19. Bird [1998] Tectonics, 17(5), 780-801 Appendix I: Algorithm

    E-print Network

    Bird, Peter

    1 Bird [1998] Tectonics, 17(5), 780-801 Appendix I: Algorithm Least-Squares Formalism I assume prediction errors (each divided by the variance of the corre- sponding rate) is to be minimized. #12;2 Bird the row equations that state that S is stationary with respect to variations #12;3 Bird [1998] Tectonics

  20. Bourns College of Engineering, University of California, Riverside EE-175: Senior Design Project

    E-print Network

    . Particular focus is on the design and implementation of web-based teleoperational robots using intelligent1 Bourns College of Engineering, University of California, Riverside EE-175: Senior Design Project standing in Electrical Engineering. Objectives The Senior Design Project is the culmination of course work

  1. 33 CFR 162.175 - Black Rock Canal and Lock at Buffalo, New York.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Navigation and Navigable Waters 2 2011-07-01 2011-07-01...Black Rock Canal and Lock at Buffalo, New York. 162.175 ...Navigation and Navigable Waters COAST GUARD, DEPARTMENT...Black Rock Canal and Lock at Buffalo, New York. In the...

  2. 33 CFR 162.175 - Black Rock Canal and Lock at Buffalo, New York.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Navigation and Navigable Waters 2 2012-07-01 2012-07-01...Black Rock Canal and Lock at Buffalo, New York. 162.175 ...Navigation and Navigable Waters COAST GUARD, DEPARTMENT...Black Rock Canal and Lock at Buffalo, New York. In the...

  3. 33 CFR 162.175 - Black Rock Canal and Lock at Buffalo, New York.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Navigation and Navigable Waters 2 2014-07-01 2014-07-01...Black Rock Canal and Lock at Buffalo, New York. 162.175 ...Navigation and Navigable Waters COAST GUARD, DEPARTMENT...Black Rock Canal and Lock at Buffalo, New York. In the...

  4. 33 CFR 162.175 - Black Rock Canal and Lock at Buffalo, New York.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Navigation and Navigable Waters 2 2013-07-01 2013-07-01...Black Rock Canal and Lock at Buffalo, New York. 162.175 ...Navigation and Navigable Waters COAST GUARD, DEPARTMENT...Black Rock Canal and Lock at Buffalo, New York. In the...

  5. MATHEMATICAL BIOSCIENCES doi:10.3934/mbe.2010.7.175 AND ENGINEERING

    E-print Network

    Kuang, Yang

    and 1968 [22] and more recently in 2009 (Swine- flu [8]). The 1918 pandemic had the highest mortality [17]. If a pandemic with similar mortality occurred today then the number of deaths could, in a worst 2010 pp. 175­189 MODELING THE INTERACTION OF CYTOTOXIC T LYMPHOCYTES AND INFLUENZA VIRUS INFECTED

  6. 2006 11 43 TC 11 175 2006-43TC-11-18

    E-print Network

    Choi, Woo-Young

    & Medical) . ZigBee * , (High speed circuit and system Lab. Yonsei University ) ** , SoC (So2006 11 43 TC 11 175 2006-43TC-11-18 ZigBee 900MHz CMOS RF ( Implementation of a CMOS RF Transceiver for 900MHz ZigBee Applications ) * , * , * , ** ( J. K. Kwon, K. Y. Park, Woo

  7. 2006 11 43 TC 11 175 2006-43TC-11-18

    E-print Network

    Choi, Woo-Young

    2006 11 43 TC 11 175 2006-43TC-11-18 ZigBee 900MHz CMOS RF ( Implementation of a CMOS RF Transceiver for 900MHz ZigBee Applications ) * , * , * , ** ( J. K. Kwon, K. Y. Park, Woo-Young Choi, and W. S. Oh ) ZigBee 900MHz ISM RF . , , , , , , , . Low

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

    E-print Network

    Spirtes, Peter

    1988-01-01

    Journal of Econometrics 39 (1988) 175-198. North-Holland LATENT VARIABLES, CAUSAL MODELS in econometrics. When, for example, a study of the British economy neglects variables that were unmeasured should not appear as latent in econometric models of the British case [see Klein (1961) for an example

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

    Microsoft Academic Search

    Shay

    1980-01-01

    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

  10. 175June 20001 HERPETOLOGICA the Mexican kingsnake, Lampropeltis nexicana. brown tree snake (Boiga irregularis). Toxicon 29

    E-print Network

    Blouin-Demers, Gabriel

    175June 20001 HERPETOLOGICA the Mexican kingsnake, Lampropeltis nexicana. brown tree snake (Boiga:149-168. brown tree snake (Boiga irregularis) in eastern SHINE,R. 1978. Sexual size dimorphism and male Australia bats (Chiroptera:Pter- the Australian colubrid snakes. Copeia 1991:120- opodidae) on Guam. Australian

  11. SDSU General Catalog 2011-2012 175 Child and Family Development

    E-print Network

    Gallo, Linda C.

    and family therapy; speech, occupational and physical therapy; social work; psychology; law; or sociologySDSU General Catalog 2011-2012 175 CFD Child and Family Development In the College of Education with the B.S. degree in applied arts and sciences. Minor in child development. Certificate in early childhood

  12. 33 CFR 162.175 - Black Rock Canal and Lock at Buffalo, New York.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Black Rock Canal and Lock at Buffalo, New York...WATERWAYS NAVIGATION REGULATIONS § 162.175 Black Rock Canal and Lock at Buffalo, New York. In the Black Rock Canal and Lock, no vessel may...

  13. 49 CFR 40.175 - What steps does the first laboratory take with a split specimen?

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false What steps does the first...Specimen Tests § 40.175 What steps does the first...specimen first arrive, you must check to see whether...be tested for. (e) You must not send to the second...information about the identity of the employee....

  14. 49 CFR 40.175 - What steps does the first laboratory take with a split specimen?

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false What steps does the first...Specimen Tests § 40.175 What steps does the first...specimen first arrive, you must check to see whether...be tested for. (e) You must not send to the second...information about the identity of the employee....

  15. 49 CFR 40.175 - What steps does the first laboratory take with a split specimen?

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false What steps does the first...Specimen Tests § 40.175 What steps does the first...specimen first arrive, you must check to see whether...be tested for. (e) You must not send to the second...information about the identity of the employee....

  16. 49 CFR 40.175 - What steps does the first laboratory take with a split specimen?

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false What steps does the first...Specimen Tests § 40.175 What steps does the first...specimen first arrive, you must check to see whether...be tested for. (e) You must not send to the second...information about the identity of the employee....

  17. Funding Highlights: Provides $17.5 billion in discretionary funding for the National Aeronautics and Space

    E-print Network

    Waliser, Duane E.

    137 Funding Highlights: · Provides $17.5 billion in discretionary funding for the National Aeronautics and Space Administration (NASA) by prioritizing the research and development that lays the life of the Space Station to 2024; | Allowing NASA and its international partners to continue

  18. vol. 175, no. 2 the american naturalist february 2010 Natural History Note

    E-print Network

    Oliveira, Paulo S.

    crypsis or camouflage, is a well-known defensive strategy of prey animals (Ruxton et al. 2004). Probably because vision is such an important part of our sensory systems, most documented cases of crypsis involve crypsis is attained * Corresponding author; e-mail: trigo@unicamp.br. Am. Nat. 2010. Vol. 175, pp. 261

  19. Volume175.number3 CHEMICALPHYSICSLETTERS 7December1990 Thermal history and temperature-dependent photon echo

    E-print Network

    Fayer, Michael D.

    Volume175.number3 CHEMICALPHYSICSLETTERS 7December1990 Thermal history and temperature thermal history. The word glass does not have as specific a definition as the term crystal does. When thinking of a crystal, one imagines a solid composed of atoms and/or molecules packed in a highly ordered

  20. INTELLIGENCE 23, 175-190 (1996) The Relationship Between WAIS-R

    E-print Network

    Crawford, John R.

    INTELLIGENCE 23, 175-190 (1996) The Relationship Between WAIS-R Abilities and Speed of Processing status) 123 participants were tested on the Wechsler Adult Intelligence Scale-Revised (WAIS-R) and a test that there is a relationship between intelligence and mental speed is an accepted part of our everyday language (Kline, 1991

  1. Z .Aquaculture 175 1999 255268 Halophytes for the treatment of saline aquaculture

    E-print Network

    Smith, Steven E.

    Z .Aquaculture 175 1999 255­268 Halophytes for the treatment of saline aquaculture effluent J. Jed the feasibility of using salt-tolerant plants halophytes as biofilters to remove nutrients from saline aquaculture fraction, using aquaculture effluent generated from an intensive tilapia culture system. The effluent

  2. Draft Genome Sequence of the Antibiotic-Producing Epiphytic Isolate Pantoea ananatis BRT175.

    PubMed

    Smith, Derek D N; Kirzinger, Morgan W B; Stavrinides, John

    2013-01-01

    Pantoea is a member of the Enterobacteriaceae, whose members have been shown to produce novel antibiotics. Here, we report the 4.8-Mb genome sequence of Pantoea ananatis strain BRT175, an epiphytic isolate from strawberries that produces an antibiotic that is effective against the fire blight pathogen, Erwinia amylovora. PMID:24201193

  3. Draft Genome Sequence of the Antibiotic-Producing Epiphytic Isolate Pantoea ananatis BRT175

    PubMed Central

    Smith, Derek D. N.; Kirzinger, Morgan W. B.

    2013-01-01

    Pantoea is a member of the Enterobacteriaceae, whose members have been shown to produce novel antibiotics. Here, we report the 4.8-Mb genome sequence of Pantoea ananatis strain BRT175, an epiphytic isolate from strawberries that produces an antibiotic that is effective against the fire blight pathogen, Erwinia amylovora. PMID:24201193

  4. Ecological Modelling 175 (2004) 6576 Modeling seed dispersal in a variable environment: a case study

    E-print Network

    Moloney, Kirk A.

    and unfavorable rain phases. Our simulation experiments show that when fruit removal rate is extremely lowEcological Modelling 175 (2004) 65­76 Modeling seed dispersal in a variable environment: a case in dispersal distance and fruit removal rate, particularly given the natural variability of the environment

  5. vol. 175, no. 3 the american naturalist march 2010 Mutualism between Consumers and Their Shared Resource

    E-print Network

    Inouye, Brian

    vol. 175, no. 3 the american naturalist march 2010 Mutualism between Consumers and Their Shared) plants. We show that mutualism between consumers and a resource species can stabilize competitive the other. The effect of this novel coexistence mechanism depends on a mutualism's biological details

  6. Biogeosciences, 2, 175187, 2005 www.biogeosciences.net/bg/2/175/

    E-print Network

    Paris-Sud XI, Université de

    -2-175 European Geosciences Union Biogeosciences Nitrous oxide fluxes and nitrogen cycling along a pasture chronosequence in Central Amazonia, Brazil B. Wick1, E. Veldkamp2, W. Z. de Mello3, M. Keller4, and P. Crill5 1 to pasture in the central Amazon near Santar´em, Par´a, Brazil. Two undis- turbed forest sites and 27 pasture

  7. Degradation of mutant p53H175 protein by Zn(II) through autophagy.

    PubMed

    Garufi, A; Pucci, D; D'Orazi, V; Cirone, M; Bossi, G; Avantaggiati, M L; D'Orazi, G

    2014-01-01

    TP53, one of the most important oncosuppressors, is frequently mutated in cancer. Several p53 mutant proteins escape proteolytic degradation and are highly expressed in an aberrant conformation often acquiring pro-oncogenic activities that promote tumor progression and resistance to therapy. Therefore, it has been vastly proposed that reactivation of wild-type (wt) function(s) from mutant p53 (mutp53) may have therapeutic significance. We have previously reported that Zn(II) restores a folded conformation from mutp53 misfolding, rescuing wild-type (wt) p53/DNA-binding and transcription activities. However, whether Zn(II) affects mutp53 stability has never been investigated. Here we show that a novel Zn(II) compound induced mutp53 (R175H) protein degradation through autophagy, the proteolytic machinery specifically devoted to clearing misfolded proteins. Accordingly, pharmacological or genetic inhibition of autophagy prevented Zn(II)-mediated mutp53H175 degradation as well as the ability of the Zn(II) compound to restore wtp53 DNA-binding and transcription activity from this mutant. By contrast, inhibition of the proteasome failed to do so, suggesting that autophagy is the main route for p53H175 degradation. Mechanistically, Zn(II) restored the wtp53 ability to induce the expression of the p53 target gene DRAM (damage-regulated autophagy modulator), a key regulator of autophagy, leading to autophagic induction. Accordingly, inhibition of wtp53 transactivation by pifithrin-? (PFT-?) impaired both autophagy and mutp53H175 degradation induced by curcumin-based zinc compound (Zn(II)-curc). Viewed together, our results uncover a novel mechanism employed by Zn(II)-curc to reactivate mutp53H175, which involves, at least in part, induction of mutp53 degradation via wtp53-mediated autophagy. PMID:24874727

  8. Degradation of mutant p53H175 protein by Zn(II) through autophagy

    PubMed Central

    Garufi, A; Pucci, D; D'Orazi, V; Cirone, M; Bossi, G; Avantaggiati, M L; D'Orazi, G

    2014-01-01

    TP53, one of the most important oncosuppressors, is frequently mutated in cancer. Several p53 mutant proteins escape proteolytic degradation and are highly expressed in an aberrant conformation often acquiring pro-oncogenic activities that promote tumor progression and resistance to therapy. Therefore, it has been vastly proposed that reactivation of wild-type (wt) function(s) from mutant p53 (mutp53) may have therapeutic significance. We have previously reported that Zn(II) restores a folded conformation from mutp53 misfolding, rescuing wild-type (wt) p53/DNA-binding and transcription activities. However, whether Zn(II) affects mutp53 stability has never been investigated. Here we show that a novel Zn(II) compound induced mutp53 (R175H) protein degradation through autophagy, the proteolytic machinery specifically devoted to clearing misfolded proteins. Accordingly, pharmacological or genetic inhibition of autophagy prevented Zn(II)-mediated mutp53H175 degradation as well as the ability of the Zn(II) compound to restore wtp53 DNA-binding and transcription activity from this mutant. By contrast, inhibition of the proteasome failed to do so, suggesting that autophagy is the main route for p53H175 degradation. Mechanistically, Zn(II) restored the wtp53 ability to induce the expression of the p53 target gene DRAM (damage-regulated autophagy modulator), a key regulator of autophagy, leading to autophagic induction. Accordingly, inhibition of wtp53 transactivation by pifithrin-? (PFT-?) impaired both autophagy and mutp53H175 degradation induced by curcumin-based zinc compound (Zn(II)-curc). Viewed together, our results uncover a novel mechanism employed by Zn(II)-curc to reactivate mutp53H175, which involves, at least in part, induction of mutp53 degradation via wtp53-mediated autophagy. PMID:24874727

  9. Testing the universality of free fall with rubidium and ytterbium in a very large baseline atom interferometer

    E-print Network

    Hartwig, Jonas; Schubert, Christian; Schlippert, Dennis; Ahlers, Holger; Posso-Trujillo, Katerine; Gaaloul, Naceur; Ertmer, Wolfgang; Rasel, Ernst M

    2015-01-01

    We propose a very long baseline atom interferometer test of Einstein's equivalence principle (EEP) with ytterbium and rubidium extending over 10m of free fall. In view of existing parametrizations of EEP violations, this choice of test masses significantly broadens the scope of atom interferometric EEP tests with respect to other performed or proposed tests by comparing two elements with high atomic numbers. In a first step, our experimental scheme will allow reaching an accuracy in the E\\"otv\\"os ratio of $7\\times 10^{-13}$. This achievement will constrain violation scenarios beyond our present knowledge and will represent an important milestone for exploring a variety of schemes for further improvements of the tests as outlined in the paper. We will discuss the technical realisation in the new infrastructure of the Hanover Institute of Technology (HITec) and give a short overview of the requirements to reach this accuracy. The experiment will demonstrate a variety of techniques which will be employed in fut...

  10. Testing the universality of free fall with rubidium and ytterbium in a very large baseline atom interferometer

    E-print Network

    Jonas Hartwig; Sven Abend; Christian Schubert; Dennis Schlippert; Holger Ahlers; Katerine Posso-Trujillo; Naceur Gaaloul; Wolfgang Ertmer; Ernst M. Rasel

    2015-03-04

    We propose a very long baseline atom interferometer test of Einstein's equivalence principle (EEP) with ytterbium and rubidium extending over 10m of free fall. In view of existing parametrizations of EEP violations, this choice of test masses significantly broadens the scope of atom interferometric EEP tests with respect to other performed or proposed tests by comparing two elements with high atomic numbers. In a first step, our experimental scheme will allow reaching an accuracy in the E\\"otv\\"os ratio of $7\\times 10^{-13}$. This achievement will constrain violation scenarios beyond our present knowledge and will represent an important milestone for exploring a variety of schemes for further improvements of the tests as outlined in the paper. We will discuss the technical realisation in the new infrastructure of the Hanover Institute of Technology (HITec) and give a short overview of the requirements to reach this accuracy. The experiment will demonstrate a variety of techniques which will be employed in future tests of EEP, high accuracy gravimetry and gravity-gradiometry. It includes operation of a force sensitive atom interferometer with an alkaline earth like element in free fall, beam splitting over macroscopic distances and novel source concepts.

  11. Efficient inverted bottom-emission blue phosphorescent organic light-emitting diodes with a ytterbium-doped electron injection layer

    NASA Astrophysics Data System (ADS)

    Lee, Hyunkoo; Ahn, Hyuk; Lee, Changhee; Kwak, Jeonghun

    2012-11-01

    An efficient electron injection layer (EIL) for inverted bottom-emission organic light-emitting diodes (IBE-OLEDs) is developed by doping ytterbium (Yb) into an organic electron transport material of 1,3,5-tri(m-pyrid-3-yl-phenyl)benzene (TmPyPB). The Yb-doped EIL in the IBE-OLEDs having iridium(III) bis(4,6-(difluorophenyl)pyridinato-N,C2') picolinate (FIrpic) as a blue phosphorescent dopant shows a lower turn-on voltage (˜4.5 V) and about a 6.6 times higher efficiency (˜8.6% and 15.3 cd/A at 0.15 mA/cm2) compared with the device without the Yb-doped EIL. Furthermore, the electroluminescence spectrum of the device with the Yb-doped EIL is about the same as that of the device without the Yb-doped EIL. This result indicates that the Yb-doped EIL improves the electron injection from the ITO cathode to the organic electron transport layer. Therefore, the Yb-doped EIL can be utilized as an effective electron injection layer in the OLEDs.

  12. Testing the universality of free fall with rubidium and ytterbium in a very large baseline atom interferometer

    NASA Astrophysics Data System (ADS)

    Hartwig, J.; Abend, S.; Schubert, C.; Schlippert, D.; Ahlers, H.; Posso-Trujillo, K.; Gaaloul, N.; Ertmer, W.; Rasel, E. M.

    2015-03-01

    We propose a very long baseline atom interferometer test of Einstein’s equivalence principle (EEP) with ytterbium and rubidium extending over 10 m of free fall. In view of existing parametrizations of EEP violations, this choice of test masses significantly broadens the scope of atom interferometric EEP tests with respect to other performed or proposed tests by comparing two elements with high atomic numbfers. In the first step, our experimental scheme will allow us to reach an accuracy in the Eötvös ratio of 7 · 10-13. This achievement will constrain violation scenarios beyond our present knowledge and will represent an important milestone for exploring a variety of schemes for further improvements of the tests as outlined in the paper. We will discuss the technical realisation in the new infrastructure of the Hanover Institute of Technology (HITec) and give a short overview of the requirements needed to reach this accuracy. The experiment will demonstrate a variety of techniques, which will be employed in future tests of EEP, high-accuracy gravimetry and gravity gradiometry. It includes operation of a force-sensitive atom interferometer with an alkaline earth-like element in free fall, beam splitting over macroscopic distances and novel source concepts.

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

    PubMed

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

    2012-10-22

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

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

    E-print Network

    James J. McLoughlin; Altaf H. Nizamani; James D. Siverns; Robin C. Sterling; Marcus D. Hughes; Bjoern Lekitsch; Björn Stein; Seb Weidt; Winfried K. Hensinger

    2010-12-17

    We present the design and operation of an ytterbium ion trap experiment with a setup offering versatile optical access and 90 electrical inter-connects that can host advanced surface and multi-layer ion trap chips mounted on chip carriers. We operate a macroscopic ion trap compatible with this chip carrier design and characterise its performance, demonstrating secular frequencies >1 MHz, and trap and cool nearly all of the stable isotopes, including 171Yb+ ions, as well as ion crystals. For this particular tap we measure the motional heating rate, , and observe a proportional to 1/omega^2 behaviour for different secular frequencies, omega. We also determine a spectral noise density S_E(1 MHz) = 3.6(9)x10^-11 V^2 m^-2 Hz^-1 at an ion electrode spacing of 310(10) mu m. We describe the experimental setup for trapping and cooling Yb+ ions and provide frequency measurements of the 2S_1/2 - 2P_1/2 and 2D_3/2 - 3D[3/2]_1/2 transitions for the stable 170Yb+, 171Yb+, 172Yb+, 174Yb+ and 176Yb+ isotopes which are more precise than previously published work.

  15. 30 CFR 1206.175 - How do I determine quantities and qualities of production for computing royalties?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...How do I determine quantities and qualities of production for computing royalties? 1206.175 Section 1206.175 Mineral Resources...How do I determine quantities and qualities of production for computing royalties? (a) For unprocessed gas, you must pay...

  16. Lasing parameters of ytterbium-doped fibres doped with P{sub 2}O{sub 5} and Al{sub 2}O{sub 3}

    SciTech Connect

    Mel'kumov, Mikhail A; Bufetov, Igor' A; Kravtsov, K S; Shubin, Aleksei V; Dianov, Evgenii M [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation)

    2004-09-30

    Absorption and emission cross sections are measured for the {sup 2}F{sub 5/2} {yields} {sup 2}F{sub 7/2} transition in Yb{sup 3+} ions in silica fibres doped with Al{sub 2}O{sub 3} and P{sub 2}O{sub 5}. The measurements were performed by methods based on spectroscopic data and by more direct methods based on laser-transition saturation. Possible lasing ranges of ytterbium-doped double-clad fibre lasers are calculated from the measured spectral dependences of stimulated transition cross sections. (fibre optics)

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

    PubMed

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

    2009-08-31

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

  18. Large-mode-area erbium-ytterbium-doped photonic-crystal fiber amplifier for high-energy femtosecond pulses at 1.55 µm

    Microsoft Academic Search

    Akira Shirakawa; Jun Ota; Mitsuru Musha; Ken'Ichi Nakagawa; Ken-Ichi Ueda; Jacob Riis Folkenberg; Jes Broeng

    2005-01-01

    We report a high-energy femtosecond fiber amplifier based on an air-cladded single-transverse-mode erbium-ytterbium-codoped photonic-crystal fiber with a 26-µm mode-field-diameter. 700-fs, 47-MHz pulses at 1557 nm were amplified and compressed to near-transform-limited 100-fs, 7.4-nJ pulses with 54-kW peak powers without chirped-pulse amplification. A linearly polarized output with an extinction ratio exceeding 42 dB was obtained by double-pass configuration. As an application,

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

    Microsoft Academic Search

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

    2008-01-01

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

  20. Art-175 Is a Highly Efficient Antibacterial against Multidrug-Resistant Strains and Persisters of Pseudomonas aeruginosa

    PubMed Central

    Briers, Yves; Walmagh, Maarten; Grymonprez, Barbara; Biebl, Manfred; Pirnay, Jean-Paul; Defraine, Valerie; Michiels, Jan; Cenens, William; Aertsen, Abram; Miller, Stefan

    2014-01-01

    Artilysins constitute a novel class of efficient enzyme-based antibacterials. Specifically, they covalently combine a bacteriophage-encoded endolysin, which degrades the peptidoglycan, with a targeting peptide that transports the endolysin through the outer membrane of Gram-negative bacteria. Art-085, as well as Art-175, its optimized homolog with increased thermostability, are each composed of the sheep myeloid 29-amino acid (SMAP-29) peptide fused to the KZ144 endolysin. In contrast to KZ144, Art-085 and Art-175 pass the outer membrane and kill Pseudomonas aeruginosa, including multidrug-resistant strains, in a rapid and efficient (?5 log units) manner. Time-lapse microscopy confirms that Art-175 punctures the peptidoglycan layer within 1 min, inducing a bulging membrane and complete lysis. Art-175 is highly refractory to resistance development by naturally occurring mutations. In addition, the resistance mechanisms against 21 therapeutically used antibiotics do not show cross-resistance to Art-175. Since Art-175 does not require an active metabolism for its activity, it has a superior bactericidal effect against P. aeruginosa persisters (up to >4 log units compared to that of the untreated controls). In summary, Art-175 is a novel antibacterial that is well suited for a broad range of applications in hygiene and veterinary and human medicine, with a unique potential to target persister-driven chronic infections. PMID:24752267

  1. Art-175 is a highly efficient antibacterial against multidrug-resistant strains and persisters of Pseudomonas aeruginosa.

    PubMed

    Briers, Yves; Walmagh, Maarten; Grymonprez, Barbara; Biebl, Manfred; Pirnay, Jean-Paul; Defraine, Valerie; Michiels, Jan; Cenens, William; Aertsen, Abram; Miller, Stefan; Lavigne, Rob

    2014-07-01

    Artilysins constitute a novel class of efficient enzyme-based antibacterials. Specifically, they covalently combine a bacteriophage-encoded endolysin, which degrades the peptidoglycan, with a targeting peptide that transports the endolysin through the outer membrane of Gram-negative bacteria. Art-085, as well as Art-175, its optimized homolog with increased thermostability, are each composed of the sheep myeloid 29-amino acid (SMAP-29) peptide fused to the KZ144 endolysin. In contrast to KZ144, Art-085 and Art-175 pass the outer membrane and kill Pseudomonas aeruginosa, including multidrug-resistant strains, in a rapid and efficient (? 5 log units) manner. Time-lapse microscopy confirms that Art-175 punctures the peptidoglycan layer within 1 min, inducing a bulging membrane and complete lysis. Art-175 is highly refractory to resistance development by naturally occurring mutations. In addition, the resistance mechanisms against 21 therapeutically used antibiotics do not show cross-resistance to Art-175. Since Art-175 does not require an active metabolism for its activity, it has a superior bactericidal effect against P. aeruginosa persisters (up to >4 log units compared to that of the untreated controls). In summary, Art-175 is a novel antibacterial that is well suited for a broad range of applications in hygiene and veterinary and human medicine, with a unique potential to target persister-driven chronic infections. PMID:24752267

  2. Hadron-nucleus elastic scattering at 70, 125, and 175 GeV/c

    SciTech Connect

    Schiz, A.; Fajardo, L.A.; Majka, R.; Marx, J.N.; Nemethy, P.; Rosselet, L.; Sandweiss, J.; Slaughter, A.J.; Ankenbrandt, C.; Atac, M.; Brown, R.; Ecklund, s.; Gollon, a.J.; Lach, J.; MacLachlan, J.; Roberts, A.; Shen, G.

    1980-06-01

    Hadron-nucleus elastic scattering is measured for ..pi../sup + -/, K/sup + -/, p, and p-bar scattering from Be, C, Al, Cu, Sn, and Pb targets at incident beam momenta of 70 and 175 GeV/c and for ..pi../sup +/, K/sup +/, and p scattering from Be, Al, and Pb targets at an incident beam momentum of 125 GeV/c. Parametrizations of dsigma/dt in the forward direction for the reactions are presented.

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

    NASA Technical Reports Server (NTRS)

    1996-01-01

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

  4. Zinc Environment and cis Peptide Bonds in Carboxypeptidase A at 1.75- Å Resolution

    Microsoft Academic Search

    D. C. Rees; M. Lewis; R. B. Honzatko; W. N. Lipscomb; K. D. Hardman

    1981-01-01

    The structure of the metalloenzyme carboxypeptidase A (peptidyl-L-amino-acid hydrolase, EC 3.4.17.1) has been refined at 1.75 Å by a restrained least-squares procedure to a conventional crystallographic R factor of 0.162. Significant results of the refined structure relative to the catalytic mechanism are described. In the native enzyme, the zinc coordination number is five (two imidazole Ndelta 1 nitrogens, the two

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

    PubMed

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

    2013-08-01

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

  6. Inhibitory Humoral Responses to the Plasmodium falciparum Vaccine Candidate EBA-175 Are Independent of the Erythrocyte Invasion Pathway

    PubMed Central

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

    2013-01-01

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

  7. Solar flux variations at 175 and 304 Å and their relation to solar wind parameters

    NASA Astrophysics Data System (ADS)

    Khabarova, O. V.; Kuzin, S. V.; Bogachev, S. A.; Pertsov, A. A.

    2006-07-01

    Variations of solar emission in the spectral ranges corresponding to the transition region (304 Å) and corona (175 Å) and their relation to solar wind parameters are investigated for the maximum and declining phase of solar cycle 23 (2001 2004) based on the CORONAS-F/SPIRIT data. It is shown that the variations of solar flux in both ranges are similar and demonstrate a high correlation for long data series. Meanwhile, some time intervals were registered when the intensity variations at 304 Å are delayed with respect to those in 175 Å by, on average, two days. For long periods, the spectra of the full-disk flux at 175 Å and of the solar wind density are close to each other; the same is true for the solar flux spectrum in the 304-Å range and the spectrum of the solar wind velocity. The assumption is made that active processes in the lower corona mainly affect long-period density variations, while the velocity characterizes the kinetics of the total stream of the outflowing matter and its long-term variations are considerably related to the physics of processes occurring deeper in the Sun.

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

    PubMed

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

    2015-01-01

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

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

    PubMed Central

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

    2014-01-01

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

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

    NASA Astrophysics Data System (ADS)

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

    2009-04-01

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

  11. Microspherical Laser In Erbium-Ytterbium-Doped Glass G. Nunzi Conti (1), C. Arnaud (2), M. Boustimi (2), P. Fron (2), S. Pelli (1), G.C. Righini (1)

    E-print Network

    Paris-Sud XI, Université de

    Microspherical Laser In Erbium-Ytterbium-Doped Glass G. Nunzi Conti (1), C. Arnaud (2), M. Boustimi experimental results on a Er3+ /Yb3+ doped microspherical laser. Our experiments have been focused on the 4 I13 combination of strong temporal and spatial confinement of light. Glass microspheres are then of interest

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

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  13. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

  14. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  15. 33 CFR 207.175a - Carlson's Landing Dam navigation lock, Withlacoochee River, Fla.; use, administration, and...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

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

    Code of Federal Regulations, 2010 CFR

    2010-04-01

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

  17. 12 CFR 225.175 - What risk management, record keeping and reporting policies are required to make merchant banking...

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...3 2013-01-01 2013-01-01 false What risk management, record keeping and reporting policies are required... Merchant Banking Investments § 225.175 What risk management, record keeping and reporting policies are...

  18. 12 CFR 225.175 - What risk management, record keeping and reporting policies are required to make merchant banking...

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...3 2014-01-01 2014-01-01 false What risk management, record keeping and reporting policies are required... Merchant Banking Investments § 225.175 What risk management, record keeping and reporting policies are...

  19. 12 CFR 225.175 - What risk management, record keeping and reporting policies are required to make merchant banking...

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...3 2012-01-01 2012-01-01 false What risk management, record keeping and reporting policies are required... Merchant Banking Investments § 225.175 What risk management, record keeping and reporting policies are...

  20. 41 CFR 102-74.175 - Are Government-leased buildings required to conform with the policies in this subpart?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Are Government-leased buildings required to conform with the policies...74-FACILITY MANAGEMENT Facility Management Energy Conservation § 102-74.175 Are Government-leased buildings required to conform with the...

  1. 41 CFR 102-85.175 - Are the standard level services for cleaning, mechanical operation, and maintenance identified in...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...the standard level services for cleaning, mechanical...REAL PROPERTY 85-PRICING POLICY FOR OCCUPANCY...Standard Levels of Service § 102-85.175...from the General Services Administration, Office of Business Performance...

  2. 41 CFR 102-73.175 - What types of special purpose space may the Department of Commerce lease?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 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...

  3. 41 CFR 102-73.175 - What types of special purpose space may the Department of Commerce lease?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 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...

  4. 25 CFR 175.12 - Procedures for adjusting electric power rates except for adjustments due to changes in the cost...

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...Procedures for adjusting electric power rates except for adjustments due to changes in the cost of purchased power or energy. 175.12 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  5. 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

    2011-04-01

    ...Procedures for adjusting electric power rates except for adjustments due to changes in the cost of purchased power or energy. 175.12 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  6. 25 CFR 175.12 - Procedures for adjusting electric power rates except for adjustments due to changes in the cost...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...Procedures for adjusting electric power rates except for adjustments due to changes in the cost of purchased power or energy. 175.12 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  7. 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

    ...Procedures for adjusting electric power rates except for adjustments due to changes in the cost of purchased power or energy. 175.12 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  8. 25 CFR 175.12 - Procedures for adjusting electric power rates except for adjustments due to changes in the cost...

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...Procedures for adjusting electric power rates except for adjustments due to changes in the cost of purchased power or energy. 175.12 Section...DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN ELECTRIC POWER UTILITIES Service Fees,...

  9. Thr(175)-phosphorylated tau induces pathologic fibril formation via GSK3?-mediated phosphorylation of Thr(231) in vitro.

    PubMed

    Moszczynski, Alexander J; Gohar, May; Volkening, Kathryn; Leystra-Lantz, Cheryl; Strong, Wendy; Strong, Michael J

    2015-03-01

    We have previously shown that amyotrophic lateral sclerosis with cognitive impairment can be characterized by pathologic inclusions of microtubule-associated protein tau (tau) phosphorylated at Thr(175) (pThr(175)) in association with GSK3? activation. We have now examined whether pThr(175) induces GSK3? activation and whether this leads to pathologic fibril formation through Thr(231) phosphorylation. Seventy-two hours after transfection of Neuro2A cells with pseudophosphorylated green fluorescent protein-tagged 2N4R tau (Thr(175)Asp), phosphorylated kinase glycogen synthase kinase 3 beta (active GSK3?) levels were significantly increased as was pathologic fibril formation and cell death. Treatment with each of 4 GSK3? inhibitors or small hairpin RNA knockdown of GSK3? abolished fibril formation and prevented cell death. Inhibition of Thr(231) phosphorylation (Thr(231)Ala) prevented pathologic tau fibril formation, regardless of Thr(175) state, whereas Thr(231)Asp (pseudophosphorylated at Thr(231)) developed pathologic tau fibrils. Ser(235) mutations did not affect fibril formation, indicating an unprimed mechanism of Thr(231) phosphorylation. These findings suggest a mechanism of tau pathology by which pThr(175) induces GSK3? phosphorylation of Thr(231) leading to fibril formation, indicating a potential therapeutic avenue for amyotrophic lateral sclerosis with cognitive impairment. PMID:25573097

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

    NASA Astrophysics Data System (ADS)

    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

    The superfast-spreading portion of the East Pacific Rise at 17.5°S 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 17°22'S and 17°35'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 17°26'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 (<10°C) 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 17.5°S EPR site are similar in scale to eruptions on the intermediate-rate spreading North Cleft segment (Juan de Fuca Ridge) but the 17.5°S event has more subtle gradients in the effusion rate of the eruptions and thermal and chemical character of the hydrothermal system.

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

    NASA Astrophysics Data System (ADS)

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

    2015-03-01

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

  12. Critical Glycosylated Residues in Exon Three of Erythrocyte Glycophorin A Engage Plasmodium falciparum EBA-175 and Define Receptor Specificity

    PubMed Central

    Salinas, Nichole D.; Paing, May M.

    2014-01-01

    ABSTRACT Erythrocyte invasion is an essential step in the pathogenesis of malaria. The erythrocyte binding-like (EBL) family of Plasmodium falciparum proteins recognizes glycophorins (Gp) on erythrocytes and plays a critical role in attachment during invasion. However, the molecular basis for specific receptor recognition by each parasite ligand has remained elusive, as is the case with the ligand/receptor pair P. falciparum EBA-175 (PfEBA-175)/GpA. This is due largely to difficulties in producing properly glycosylated and functional receptors. Here, we developed an expression system to produce recombinant glycosylated and functional GpA, as well as mutations and truncations. We identified the essential binding region and determinants for PfEBA-175 engagement, demonstrated that these determinants are required for the inhibition of parasite growth, and identified the glycans important in mediating the PfEBA-175–GpA interaction. The results suggest that PfEBA-175 engages multiple glycans of GpA encoded by exon 3 and that the presentation of glycans is likely required for high-avidity binding. The absence of exon 3 in GpB and GpE due to a splice site mutation confers specific recognition of GpA by PfEBA-175. We speculate that GpB and GpE may have arisen due to selective pressure to lose the PfEBA-175 binding site in GpA. The expression system described here has wider application for examining other EBL members important in parasite invasion, as well as additional pathogens that recognize glycophorins. The ability to define critical binding determinants in receptor-ligand interactions, as well as a system to genetically manipulate glycosylated receptors, opens new avenues for the design of interventions that disrupt parasite invasion. PMID:25205096

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

    PubMed Central

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

    2013-01-01

    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. PMID:23717209

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

    SciTech Connect

    Pollari, R.A.

    1995-02-01

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

  15. The SUPERFAMILY 1.75 database in 2014: a doubling of data

    PubMed Central

    Oates, Matt E.; Stahlhacke, Jonathan; Vavoulis, Dimitrios V.; Smithers, Ben; Rackham, Owen J.L.; Sardar, Adam J.; Zaucha, Jan; Thurlby, Natalie; Fang, Hai; Gough, Julian

    2015-01-01

    We present updates to the SUPERFAMILY 1.75 (http://supfam.org) online resource and protein sequence collection. The hidden Markov model library that provides sequence homology to SCOP structural domains remains unchanged at version 1.75. In the last 4 years SUPERFAMILY has more than doubled its holding of curated complete proteomes over all cellular life, from 1400 proteomes reported previously in 2010 up to 3258 at present. Outside of the main sequence collection, SUPERFAMILY continues to provide domain annotation for sequences provided by other resources such as: UniProt, Ensembl, PDB, much of JGI Phytozome and selected subcollections of NCBI RefSeq. Despite this growth in data volume, SUPERFAMILY now provides users with an expanded and daily updated phylogenetic tree of life (sTOL). This tree is built with genomic-scale domain annotation data as before, but constantly updated when new species are introduced to the sequence library. Our Gene Ontology and other functional and phenotypic annotations previously reported have stood up to critical assessment by the function prediction community. We have now introduced these data in an integrated manner online at the level of an individual sequence, and—in the case of whole genomes—with enrichment analysis against a taxonomically defined background. PMID:25414345

  16. The SUPERFAMILY 1.75 database in 2014: a doubling of data.

    PubMed

    Oates, Matt E; Stahlhacke, Jonathan; Vavoulis, Dimitrios V; Smithers, Ben; Rackham, Owen J L; Sardar, Adam J; Zaucha, Jan; Thurlby, Natalie; Fang, Hai; Gough, Julian

    2015-01-01

    We present updates to the SUPERFAMILY 1.75 (http://supfam.org) online resource and protein sequence collection. The hidden Markov model library that provides sequence homology to SCOP structural domains remains unchanged at version 1.75. In the last 4 years SUPERFAMILY has more than doubled its holding of curated complete proteomes over all cellular life, from 1400 proteomes reported previously in 2010 up to 3258 at present. Outside of the main sequence collection, SUPERFAMILY continues to provide domain annotation for sequences provided by other resources such as: UniProt, Ensembl, PDB, much of JGI Phytozome and selected subcollections of NCBI RefSeq. Despite this growth in data volume, SUPERFAMILY now provides users with an expanded and daily updated phylogenetic tree of life (sTOL). This tree is built with genomic-scale domain annotation data as before, but constantly updated when new species are introduced to the sequence library. Our Gene Ontology and other functional and phenotypic annotations previously reported have stood up to critical assessment by the function prediction community. We have now introduced these data in an integrated manner online at the level of an individual sequence, and--in the case of whole genomes--with enrichment analysis against a taxonomically defined background. PMID:25414345

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

    SciTech Connect

    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

    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.

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

    NASA Astrophysics Data System (ADS)

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

    1999-07-01

    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.

  19. Broadband generation by multiple four-wave mixing process due to ASE Q-switching in high-power double-clad ytterbium-doped fiber amplifier

    NASA Astrophysics Data System (ADS)

    Chowdhury, Sourav D.; Shekhar, Nishant; Saha, Maitreyee; Sen, Ranjan; Pal, Mrinmay

    2014-11-01

    Broadband output from 1060nm to 1700nm and cascaded four-wave mixing generated red light pulsing is observed in a fiber amplifier set up consisting of a 5.5m double clad, double D shaped Ytterbium doped fiber, a single clad passive fiber for excess pump absorption and a splitter, both with and without a CW seed. Self-pulsing occurs from ASE due to passive Q-switching by saturable absorption effect of the active fiber and also depends on splice loss. The pulses generate broadband output by multiple four-wave mixing process with maximum broadening efficiency near 1300nm which is the zero dispersion wavelength for silica fiber. Pulses traveling both in forward and backward direction have enough peak power and energy to damage splice points and fiber components. When seeded the self-pulsing and broadband generation is often suppressed but again generate at increased pump powers.

  20. A novel chemiluminescence from the reaction of singlet oxygen with ?-diketonates of europium(III), neodymium(III) and ytterbium(III).

    PubMed

    Kazakov, Dmitri V; Safarov, Farit E

    2014-12-01

    Decomposition of 1,4-dimethylnaphthalene endoperoxide, which is the source of singlet oxygen, in the presence of ?-diketonates of europium(III), neodymium(III) and ytterbium(III) is accompanied by bright chemiluminescence (CL) in visible and near infra-red spectral region due to characteristic emission from the lanthanides at ?max = 615 and 710 nm ((5)D0?(7)F2 and (5)D0?(7)F4 transitions of Eu(3+)), 900 nm ((4)F3/2?(4)I9/2 transition of Nd(3+)) and 1000 nm ((2)F5/2?(2)F7/2 transition of Yb(3+)). Singlet oxygen is the key intermediate responsible for the observed CL, which is presumably generated by the reaction of (1)O2 with ligands of the complexes. The CL phenomenon discovered herein paves the way towards the development of lanthanide-based CL probe for (1)O2. PMID:25358493