97 Result(s)

Article

Abstracts

J. M. Derlon MD, M. C. Petit-taboué MD, F. Dauphin PhD… in Journal of Neuro-Oncology (1994)

Article

A system for measuring biaxial creep strains over short gage lengths

This paper presents a new system for measuring biaxial strains over gage lengths of 150 micrometers at temperatures up to 300°C under constant loading for times as long as 1300 hours. This system has been used...

H. Zeng, W. N. Sharpe Jr. in Experimental Mechanics (1996)

Article

Identification of the primary metal ion-activation sites of the diphtheria tox represser by X-ray crystallography and site-directed mutational analysis

The diphtheria tox represser, DtxR, is a 226 amino acid transition metal ion-activated regulatory protein that controls the expression of diphtheria toxin in toxigenic Corynebacterium diphtheriae. The previously ...

X. Ding, H. Zeng, N. Schiering, D. Ringe, J.R. Murphy in Nature Structural Biology (1996)

Article

Advanced Bulge Test System

The bulge test is an established method of measuring the residual stress and elastic stiffness of thin-film materials. We present an advanced experimental bulge-testing system that provides advantages in speed...

H. Keiner, F. J. von Preissig, H. Zeng, M. N. G. Nejhad… in MRS Online Proceedings Library (1997)

Article

Low-temperature cracking of polymer-modified asphalt

A laboratory investigation was conducted to study different types of polymer-modified asphalt with regard to low temperature behaviour. The thermal stress restrained specimen test (TSRST) was used to assess th...

U. Isacsson, H. Zeng in Materials and Structures (1998)

Article

Cracking of asphalt at low temperature as related to bitumen rheology

A laboratory investigation of the influence of bitumen rheology on low temperature behaviour of asphalt mixtures is described. Five bitumens from four sources and three different mixture types were studied. Rh...

U Isacsson, H Zeng in Journal of Materials Science (1998)

Article

Thermal Behavior of Urea-(D) Tartaric Acid and Urea-(DL) Tartaric Acid Crystals

The thermal behavior of two new non-linear optical (NLO) materials, urea-(D) tartaric acid (UDT) and urea-(DL) tartaric acid (UDLT) were studied by using DSC, TG and TMA. The results show that: 1) The two crys...

F. Q. Meng, M. K. Lu, Z. H. Yang, H. Zeng in Journal of Thermal Analysis and Calorimetry (1998)

Article

Test Methods for Characterizing Piezoelectric Thin Films

Two experimental techniques for quantifying MEMS-relevant material constants of piezoelectric thin films are presented. The first is an improved version of our recently developed ‘plank method.’ This technique...

F. J. von Preissig, H. Zeng, E. S. Kim in MRS Online Proceedings Library (1998)

Article

Electrochemically self-assembled quantum dot arrays

We report some results pertaining to the magnetic, optical and topographic properties of electrochemically self-assembled quantum dots. Some of these dots self-order into two-dimensional hexagonal-close-packed...

S. Bandyopadhyay, L. Menon, N. Kouklin, H. Zeng… in Journal of Electronic Materials (1999)

Article

Size dependence of the magnetic properties of electrochemically self-assembled Fe quantum dots

A quasi-periodic array of Fe quantum dots of cylindrical shape has been synthesized by electrodeposition of Fe in porous alumina. By controlling the fabrication parameters, we have controlled the length, diame...

L. Menon, M. Zheng, H. Zeng, S. Bandyopadhyay… in Journal of Electronic Materials (2000)

Article

CD38 expression by hematopoietic stem cells of newborn and juvenile mice

While investigators in a number of laboratories have documented that the hematopoietic stem cells (HSCs) of fetal and adult mice are CD38⁺, no information is available about CD38 expression by HSCs of newborn and...

Y Higuchi, H Zeng, M Ogawa in Leukemia (2003)

Article

Q-switched mode-locking with Cr⁴⁺ : YAG in a diode pumped Nd : GdVO₄ laser

We have demonstrated passively Q-switched mode-locking in a laser-diode-pumped Nd : GdVO₄ laser with an intracavity Cr⁴⁺ : YAG saturable absorber. At a pump power of 19.4 W, the Q-switched mode-locked laser produ...

S. Zhang, E. Wu, H. Pan, H. Zeng in Applied Physics B (2004)

Article

Room-temperature ferromagnetic nanotubes controlled by electron or hole do**

Nanotubes and nanowires with both elemental^1,2 (carbon or silicon) and multi-element^3,4,5 compositions (such as compound semiconductors or oxides), and exhibiting electronic properties ranging from metallic to se...

L. Krusin-Elbaum, D. M. Newns, H. Zeng, V. Derycke, J. Z. Sun, R. Sandstrom in Nature (2004)

Article

Generation of accurately synchronized pump source for optical parametric chirped pulse amplification

We demonstrate the generation of ultra-short pulses at 1064 nm by continuous-wave seeded non-collinear optical parametric amplification in a β-barium borate crystal pumped by the second harmonics of a femtosec...

H. Zeng, J. Wu, H. Xu, K. Wu, E Wu in Applied Physics B (2004)

Article

Explosive shock processing of Pr₂Fe₁₄B/α–Fe exchange-coupled nanocomposite bulk magnets

Explosive shock compaction was used to consolidate powders obtained from melt-spun Pr₂Fe₁₄B/α–Fe nanocomposite ribbons, to produce fully dense cylindrical compacts of 17–41-mm diameter and 120-mm length. Characte...

Z. Q. **, N. N. Thadhani, M. McGill, Y. Ding, Z. L. Wang… in Journal of Materials Research (2005)

Article

High power single-longitudinal-mode operation in a twisted-mode-cavity laser with a c-cut Nd:GdVO₄ crystal

A twisted-mode-cavity laser was established by using a piece of c-cut Nd:GdVO₄ crystal as the laser’s active material. Output spectra were scanned by a scanning Fabry–Perot interferometer, which demonstrated that...

E. Wu, H. Pan, S. Zhang, H. Zeng in Applied Physics B (2005)

Article

All-optical control of the carrier-envelope phase with multi-stage optical parametric amplifiers verified with spectral interference

Intense ultrashort laser pulses with stabilized carrier-envelope phase (CEP) are generated at 800 nm by using multi-stage collinear and non-collinear optical parametric amplifiers (OPAs). The first-stage colli...

K. Wu, Y. Peng, S. Xu, H. Zeng in Applied Physics B (2006)

Article

All-optical stabilization of carrier-envelope phase by use of difference frequency generation with seeded amplification of colored conical emission

We stabilized the carrier-envelope phase of pulses emitted by a femtosecond regenerative amplifier through difference frequency generation between pump and seeded amplification of colored conical emission. See...

K. Wu, X. Yang, H. Zeng in Applied Physics B (2007)

Article

Broadband optical amplification near 1300 nm in bismuth-doped germanate glass

In this paper, we present the broadband optical amplification in bismuth-doped germanate glass, at the second telecommunication window when excited with 808 nm and 980 nm laser diodes, respectively. The amplif...

J. Ren, B. Wu, X. Jiang, H. Dong, H. Zeng, J. Qiu in Applied Physics B (2007)