Search results for: Jennifer Kung

Items from 1 to 17 out of 17 results

article

Single-crystal X-ray diffraction study of Fe₂SiO₄ fayalite up to 31 GPa

Jin S. Zhang, Yi Hu, Hannah Shelton, Jennifer Kung, more

Physics and Chemistry of Minerals > 2017 > 44 > 3 > 171-179

Olivine is widely believed to be the most abundant mineral in the Earth’s upper mantle. Here, we report structural refinement results for the Fe-end-member olivine, Fe₂SiO₄ fayalite, up to 31 GPa in diamond-anvil cell, using single-crystal synchrotron X-ray diffraction. Unit-cell parameters a, b, c and V, average Si–O Fe–O bond lengths, as well as Si–O Fe–O polyhedral volumes continuously decrease...

article

The FOXO1 Transcription Factor Instructs the Germinal Center Dark Zone Program

David Dominguez-Sola, Jennifer Kung, Antony B. Holmes, Victoria A. Wells, more

Immunity > 2015 > 43 > 6 > 1064-1074

The pathways regulating formation of the germinal center (GC) dark zone (DZ) and light zone (LZ) are unknown. In this study we show that FOXO1 transcription factor expression was restricted to the GC DZ and was required for DZ formation, since its absence in mice led to the loss of DZ gene programs and the formation of LZ-only GCs. FOXO1-negative GC B cells displayed normal somatic hypermutation but...

article

Phase transition and elasticity of enstatite under pressure from experiments and first-principles studies

Baosheng Li, Jennifer Kung, Wei Liu, Robert C. Liebermann

Physics of the Earth and Planetary Interiors > 2014 > 228 > Complete > 63-74

We have investigated the thermodynamic stability, crystal structure, elastic constants, and sound velocities of MgSiO ₃ -enstatite using data from X-ray diffraction and ultrasonic measurements up to 16.8GPa and first-principles calculations up to 30GPa. The calculated enthalpies provide theoretical support for the phase transition from Pbca to P2 ₁ /c between 9 and 14GPa previously...

article

Expanding repertoire in the oculomotor periphery: selective compartmental function in rectus extraocular muscles

Joseph L. Demer, Robert A. Clark, Roberta M. da Silva Costa, Jennifer Kung, more

Annals of the New York Academy of Sciences > 1233 > 1 > 8 - 16

Since connective tissue pulleys implement Listing's law by systematically changing rectus extraocular muscle (EOM) pulling directions, non‐Listing's law gaze dependence of the vestibulo‐ocular reflex is currently inexplicable. Differential activation of compartments within rectus EOMs may endow the ocular motor system with more behavioral diversity than previously supposed. Innervation to horizontal,...

article

Does the 3-step test or any other clinical feature predict superior oblique (SO) atrophy?

Joseph L. Demer, Robert A. Clark, Jennifer Kung

Journal of AAPOS > 2011 > 15 > 1 > e17

article

Study of monazite under high pressure

Tony Huang, Jiann-Shing Lee, Jennifer Kung, Chih-Ming Lin

Solid State Communications > 2010 > 150 > 37-38 > 1845-1850

Monazite was studied under high pressures of up to 20 GPa and 12 GPa by using synchrotron X-ray diffraction and Raman spectroscopy, respectively. X-ray diffraction data suggested that there was a structural distortion at ∼11.5 GPa. The pressure–volume data of the monazite was fitted to a third-order Birch–Murnaghan equation of state and yielded a bulk modulus of 109(1) GPa and a pressure derivative...

article

Elasticity of (Mg0.87Fe0.13)2SiO4 wadsleyite to 12GPa and 1073K

Wei Liu, Jennifer Kung, Baosheng Li, Nori Nishiyama, more

Physics of the Earth and Planetary Interiors > 2009 > 174 > 1-4 > 98-104

Elasticity of (Mg _0.87 Fe _0.13 ) ₂ SiO ₄ wadsleyite has been measured at simultaneous high pressure and high temperature to 12GPa and 1073K using ultrasonic interferometry in conjunction with synchrotron X-radiation. The elastic moduli and their pressure and temperature derivatives are precisely determined using pressure-standard-free third-order and fourth-order finite...

article

Thermoelastic behaviour of silicate perovskites: Insights from new high-temperature ultrasonic data for ScAlO3

Ian Jackson, Jennifer Kung

Physics of the Earth and Planetary Interiors > 2008 > 167 > 3-4 > 195-204

(Mg,Fe,Al)(Si,Al)O ₃ perovskite, stable only at pressures >20GPa, is the dominant mineral of the Earth's lower mantle and thus controls its physical properties including seismic wave speeds. However, the development of a thorough understanding of the thermoelastic behaviour of this silicate perovskite is compromised by its marginal metastability on recovery at ambient conditions. Study...

article

High-temperature elasticity of magnesioferrite spinel

Sytle M. Antao, Ian Jackson, Baosheng Li, Jennifer Kung, more

Physics and Chemistry of Minerals > 2007 > 34 > 5 > 345-350

The elastic moduli of magnesioferrite spinel, MgFe₂O₄, and their temperature dependence have been determined for the first time by ultrasonic measurements on a polycrystalline specimen. The measurements were carried out at 300 MPa and to 700°C in a gas-medium high-pressure apparatus. On heating, both the elastic bulk (K _S) and shear (G) moduli decrease linearly to 350°C. By combining with extant thermal-expansion...

article

Ultrasonic observations of elasticity changes across phase transformations in MgSiO3 pyroxenes

Jennifer Kung, Baosheng Li, Robert C. Liebermann

Journal of Physics and Chemistry of Solids > 2006 > 67 > 9-10 > 2051-2055

Using ultrasonic interferometry in conjunction with synchrotron X-radiation techniques in a high-pressure, multi-anvil apparatus, the elastic behavior of MgSiO ₃ pyroxene has been continuously monitored as the specimens undergo phase transformations from the orthoenstatite (OEN) to the high-pressure clinoenstatite phase (HP-CEN) and from HP-CEN to the low-pressure clinoenstatite phase (LP-CEN)...

article

Elastic properties of pyroxene polymorphs of MgSiO3 and implications for seismic models and discontinuities in the Earth’s upper mantle

Robert C. Liebermann, Jennifer Kung, Baosheng Li, Ian Jackson

Geochimica et Cosmochimica Acta > 2006 > 70 > 18 Supplement > A357

article

Elasticity of polycrystalline pyrope (Mg3Al2Si3O12) to 9GPa and 1000°C

Gabriel D. Gwanmesia, Jianzhong Zhang, Kenneth Darling, Jennifer Kung, more

Physics of the Earth and Planetary Interiors > 2006 > 155 > 3-4 > 179-190

Acoustic wave velocities for synthetic polycrystalline pyrope (Mg ₃ Al ₂ Si ₃ O ₁₂ ) were measured to 9GPa and temperatures up to 1000°C by ultrasonic interferometry combined with energy-dispersive synchrotron X-ray diffraction in a cubic-anvil DIA-type apparatus (SAM-85). Specimen lengths at high pressures (P) and temperatures (T) are directly measured by X-radiographic...

article

In situ measurements of sound velocities and densities across the orthopyroxene -> high-pressure clinopyroxene transition in MgSiO ₃ at high pressure

Jennifer Kung, Baosheng Li, Takeyuki Uchida, Yanbin Wang, more

Physics of the Earth and Planetary Interiors > 2004 > 147 > 1 > 27-44

Using acoustic measurement interfaced with a large volume multi-anvil apparatus in conjunction with in situ X-radiation techniques, we are able to measure the density and elastic wave velocities (V _P and V _S ) for both ortho- and high-pressure clino-MgSiO ₃ polymorphs in the same experimental run. The elastic bulk and shear moduli of the unquenchable high-pressure clinoenstatite...

article

Ultrasonic measurements of the sound velocities in polycrystalline San Carlos olivine in multi-anvil, high-pressure apparatus

Kenneth L. Darling, Gabriel D. Gwanmesia, Jennifer Kung, Baosheng Li, more

Physics of the Earth and Planetary Interiors > 2004 > 143-144 > Complete > 19-31

Sound velocities in polycrystalline San Carlos olivine have been measured to pressures of 7GPa at room temperature in a 1000t uniaxial, split-cylinder apparatus (USCA-1000) of the Kawai multi-anvil type. These velocities and elastic moduli are in good agreement with those calculated from single-crystal moduli determined by previous investigators. In preliminary experiments in a DIA-type, cubic anvil...

article

Modern techniques in measuring elasticity of Earth materials at high pressure and high temperature using ultrasonic interferometry in conjunction with synchrotron X-radiation in multi-anvil apparatus

Baosheng Li, Jennifer Kung, Robert C. Liebermann

Physics of the Earth and Planetary Interiors > 2004 > 143-144 > Complete > 559-574

In the past 6 years, state-of-the-art techniques have been developed for the studies of elastic properties of polycrystalline and single-crystal materials using simultaneous ultrasonic and X-ray diffraction techniques at high pressures and temperatures in multi-anvil apparatus. The capability of these techniques is illustrated using recent data for mantle phases such as forsterite, wadsleyite, CaSiO...

article

Elasticity of (Mg0.83,Fe0.17)O ferropericlase at high pressure: ultrasonic measurements in conjunction with X-radiation techniques

Jennifer Kung, Baosheng Li, Donald J Weidner, Jianzhong Zhang, more

Earth and Planetary Science Letters > 2002 > 203 > 1 > 557-566

The elasticity of ferropericlase with a potential mantle composition of (Mg_0.83,Fe_0.17)O is determined using ultrasonic interferometry in conjunction with in situ X-radiation techniques (X-ray diffraction and X-radiography) in a DIA-type cubic anvil high-pressure apparatus to pressures of 9 GPa (NaCl pressure scale) at room temperature. In this study, we demonstrate that it is possible to directly...

article

Solution Structure of the Second Extracellular Loop of Human Thromboxane A ₂ Receptor ^†

Ke-He Ruan, Shui-Ping So, Jiaxin Wu, Dawei Li, more

Biochemistry > 2001 > 40 > 1 > 275 - 280

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