Sample records for 物理学 (physics)
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92

WORKS ON CHINESE PRIMARY FREQUENCY STANDARDS

Xiaoren, Yang

This paper gives some specific features and the evaluation results of the Chinese primary frequency standards. Some investigations on the frequency shifts due to the Millman effect and the Majorana effect are discussed.

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94

Vacancy in 6H-Silicon Carbide studied by slow positron beam

Wang, HY; Weng, HM; Hang, DS; Zhou, XY; Ye, BJ; Fan, YM; Han, RD; Ling, FCC; Hui, IP

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103

The Double Star plasma electron and current experiment

Fazakerley, AN; Carter, PJ; Watson, G; Spencer, A; Sun, YQ; Coker, J; Coker, P; Kataria, DO; Fontaine, D; Liu, ZX; Gilbert, L

The Double Star Project is a collaboration between Chinese and European space agencies, in which two Chinese magnetospheric research spacecraft, carrying Chinese and European instruments, have been launched into equatorial (on 29 December 2003) and polar (on 25 July 2004) orbits designed to enable c...

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105

THz generation by optical rectification and competition with other nonlinear processes

Zhao, Zhen-Yu; Hameau, Sophie; Tignon, Jérôme

We present a study of the competition between tera-hertz (THz) generation by optical rectification in ZnTe crystals, two-photon absorption, second harmonic generation and free-carrier absorption. The two-photon nonlinear absorption coefficient, second harmonic generation efficiency and free-ca...

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107

Subpolar Gyre Index and the North Atlantic Meridional Overturning Circulation in a Coupled Climate Model

Gao, Yong-Qi; Yu, Lei

The subpolar gyre index (SPG), derived from the analysis of sea surface height (SSH), is proposed to be a potential indicator for the North Atlantic Meridional Overturning Circulation (AMOC) based on observation as well as the Ocean General Circulation Model (OGCM). We investigated the corresponden...

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109

Status report on organo-metallic beams at GANIL

Leherissier, P.; Barue, C.; Canet, C.; Dubois, M.; Flambard, J.L.; Jaffres, P.A.; Jardin, P.; Gaubert, G.; Lecesne, N.

Previous experiments with organo-metallic compounds like ferrocene, nickelocene and magnesocene showed that a pure spectrum must be obtained on the residual,gas mass analyser before running successfully on the ion source. In collaboration with the chemistry department of the University of Caen, LCMT...

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112

Spin glass behaviour and spin-dependent scattering in La0.7Ca0.3Mn0.9Cr0.1O3 perovskites

Wu, BM; Ausloos, Marcel; Du, YL; Zheng, WH; Li, B; Fagnard, Jean-François; Vanderbemden, Philippe

The magnetic, electrical and thermal transport properties of the perovskite La0.7Ca0.3Mn0.9Cr0.1O3 have been investigated by measuring dc magnetization, ac susceptibility, the magnetoresistance and thermal conductivity in the temperature range of 5-300 K. The spin glass behaviour with a spin freezin...

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113

Simple classification of light baryons

Chen, Y; Ma, B-Q

We introduce a classification number n which describes the baryon mass information in a fuzzy manner. According to n and Jp of baryons, we put all known light baryons in a simple table in which some baryons with same (n, Jp) are classified as members of known octets or decuplets. Meanwhile, we predi...

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120

Review Of Kelvin's Equation And Its Modification In Characterization Of Mesoporous Materials

Zhang, Y; Lam, FL-Y; Yan, Z-F; Hu, X

Physical And Mathematical Models As Well As Calculation Methods Of Nitrogen Bed On Porous Media Have Been Introduced To Evaluate The Structural Parameters Of Mesoporous Materials. Kelvin's Equation Is A Link Between The Relative Adsorbate Pressure, The Mean Pore Radius, And Pore Capillarity On The B...

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122

Relationships between submicrometer particulate air pollution and air mass history in Beijing, China, 2004?2006

Wehner, B.; Birmili, W.; Ditas, F.; Wu, Z.; Hu, M.; Liu, X.; Mao, J.; Sugimoto, N.; Wiedensohler, A.

The Chinese capital Beijing is one of the global megacities where the effects of rapid economic growth have led to complex air pollution problems that are not well understood. In this study, ambient particle number size distributions in Beijing between 2004 and 2006 are analysed as a function of reg...

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125

På AI-teknikens axlar : Om kunskapssociologin och stark artificiell intelligens

Kåhre, Peter

This dissertation is concerned with Sociology’s stance in the debate on Strong Artificial Intelligence, i.e. such AI that is able to shape new knowledge without human interference. There is a need for sociologists to realize the difference between two approaches to constructing AI systems: Symbolic ...

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126

Precision measurement of the e+e− → π + π−(γ ) cross-section with ISR method

Wang, L.-L.

Vacuum polarization integral involves the vector spectral functions which can be experimentally determined. As the dominant uncertainty source to the integral, the precision measurement of the %born cross section of $e^+e^-\rightarrow\pi^+\pi^-(\gamma)$ as a function of energy from $2\pi$ threshold ...

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127

Pion charge form factor and constraints from space-time translations

Desplanques, B.; Dong, Yu Bing

The role of Poincaré covariant space-time translations is investigated in the case of a relativistic quantum mechanics approach to the pion charge form factor. It is shown that the related constraints are generally inconsistent with the assumption of a single-particle current, which is most often re...

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134

On interlayer interaction of 4O.8 free-standing films: Experiment and theory

Jin, AJ; Lin, B

Substrate-free films of N-(4-n-butoxybenzylidene-4-n-octylaniline (4O.8) show a fascinating interlayer interaction. This interaction significantly affects the next ordering transition, or the second hexatic-B order, upon cooling. The Landau-de Gennes theory is employed to model the effect of the enh...

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135

Observation of a p(p)over-bar mass threshold enhancement in psi ' -> pi(+)pi(-)J/psi(J/psi -> gamma p(p)over-bar) decay

Ablikim, M; Achasov, MN; An, L; An, Q; An, ZH; Bai, JZ; Ban, Y; Berger, N; Bian, JM; Boyko, I; Briere, RA; Chen, JC; Lange, S

The decay channel Ψ' → π+π− J/Ψ(J/Ψ → γp) is studied using a sample of 1.06 × 108 Ψ' events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the p invariant mass spectrum. The enhancement can be fitted with an S-wave Breit–Wigner resonance function with ...

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136

Observation of a p(p)over-bar mass threshold enhancement in psi ' -> pi(+)pi(-)J/psi(J/psi -> gamma p(p)over-bar) decay

Ablikim, M; Achasov, MN; An, L; An, Q; An, ZH; Bai, JZ; Ban, Y; Berger, N; Bian, JM; Boyko, I; Briere, RA; Bytev, V; Cai, X; Cao, GF

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138
140

Modeling tone and intonation in Mandarin and English as a process of target approximation

Prom-on, S; Xu, Y; Thipakorn, B

This paper reports the development of a quantitative target approximation (qTA) model for generating F-0 contours of speech. The qTA model simulates the production of tone and intonation as a process of syllable-synchronized sequential target approximation [Xu, Y. (2005). "Speech melody as articulat...

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144

Large Low-Field Magnetoresistance Observed in Polycrystalline La0.7Ca0.3MnO3 Films

Wang, ZH; Lian, GJ; Gao, J; Zhou, YQ; Kang, JF; Li, MY; Xiong, GC

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161
164

Early Chinese work in natural science : a re-examination of the physics of motion, acoustics, astronomy and scientific thoughts 中華早期自然科學之再研究

Chen, Cheng-Yih

This book re-examines the nature of early Chinese work in natural science, on the basis of original records analysis and artifacts discovered in recent decades by archaeological explorations of China's past. It presents a concise account of early scientific ideas and thoughts of nature, and their ef...

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165

ECR Ion sources for radioactive ion beam production

Jardin, P.; Canet, C.; Cornell, J.C.; Dupuis, M.; Eléon, C.; Flambard, J.L.; Gaubert, G.; Lecesne, N.; Leherissier, P.

ECRIS's dedicated to radioactive ion producton must be as efficient as those used for production of stable elements, but in addition they are subject to more specific constraints such as radiation hardness, short atom-to-ion transformation time, beam purity and low cost. Up to now, different target/...

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166

Dielectric coatings for optimized low-loss saturable absorbers for high-power ultrafast laser

Zhang, Liang; König, Farina; Neuhaus, Jörg; Bauer, Dominik; Dekorsy, Thomas; Chen, Yafu

With the development of high power ultrafast laser passively mode-locked by a semiconductor saturable absorber mirror (SESAM), the damage threshold and degeneration mechanism of the SESAM become more and more important. One way to reduce the maximulIl electric field inside the active part of the SES...

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167

Deep level defects in 6H silicon carbide 六方 碳化硅中的深能級缺陷

Ling, FCC; Chen, X; Fung, SHY; Beling, CD; Gong, M; Ge, WK; Wang, JN; Brauer, G; Anwand, W; Skorupa, W

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168

Decreasing Arctic Sea Ice Mirrors Increasing CO2 on Decadal Time Scale

Johannessen, Ola M.

Arctic sea ice is a keystone indicator of greenhouse-gas induced global climate change, which is expected to be amplified in the Arctic. Here we directly compare observed variations in arctic sea-ice extent and CO2 since the beginning of the 20th century, identifying a strengthening linkage, such th...

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169

Decreasing Arctic Sea Ice Mirrors Increasing CO2 on Decadal Time Scale

Johannessen, Ola M.

Arctic sea ice is a keystone indicator of greenhouse-gas induced global climate change, which is expected to be amplified in the Arctic. Here we directly compare observed variations in arctic sea-ice extent and CO2 since the beginning of the 20th century, identifying a strengthening linkage, such th...

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170

Data assimilation of dust aerosol observations for CUACE/Dust forecasting system

Niu, T.; Gong, S. L.; Zhu, G. F.; Liu, H. L.; Hu, X. Q.; Zhou, C. H.; Wang, Y. Q.

A data assimilation system (DAS) was developed for the Chinese Unified Atmospheric Chemistry Environment ? Dust (CUACE/Dust) forecast system and applied in the operational forecasts of sand and dust storm (SDS) in spring 2006. The system is based on a three dimensional variational method (3D-Var) an...

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173

Chinese growing pains

Zhong, J; Wang, C; Wang, Y

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175

CUACE/Dust ? an integrated system of observation and modeling systems for operational dust forecasting in Asia

Gong, S. L.; Zhang, X. Y.

An integrated sand and dust storm (SDS) forecasting system ? CUACE/Dust (the Chinese Unified Atmospheric Chemistry Environment for Dust) has been developed, which consists of a comprehensive dust aerosol module with emission, dry/wet depositions and other atmospheric dynamic processes, and a data as...

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176

CUACE/Dust ? an integrated system of observation and modeling systems for operational dust forecasting in Asia

Gong, S. L.; Zhang, X. Y.

An integrated sand and dust storm (SDS) forecasting system ? CUACE/Dust (Chinese Unified Atmospheric Chemistry Environment for Dust) has been developed, which consists of a comprehensive dust aerosol module with emission, dry/wet depositions and other atmospheric dynamic processes, and a data assimi...

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177

Blue pigments in XVI-XVII century glazes : a comparative study between portuguese faiences and contemporary chinese porcelains manufactured for portuguese market

Figueiredo, M. Ondina; Silva, Teresa P.; Veiga, João Paulo; Prudêncio, M. Isabel; Dias, M. Isabel; Matos, Maria Antónia

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181

Anomalous I V curve for mono-atomic carbon chains

SANVITO, STEFANO

The electronic transport properties of mono-atomic carbon chains were studied theoretically using a combination of density functional theory and the non-equilibrium Green's functions method. The I–V curves for the chains composed of an even number of atoms and attached to gold electrodes through sul...

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182

Anharmonic helical oscillator in single-walled carbon nanotubes

Lin, B-S; Su, Z-Y

The dynamic behaviour of a particle, as simple as a helium atom, traveling in a single-walled carbon nanotube is investigated. Applying an anisotropic Yukawa-6 potential to the He-C pair interaction and using the symmetry of the tube, we calculate the potential profiles in nanotubes. It was found th...

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185

An Experimental Study of the Water Transfer Through Confined Compacted GMZ Bentonite

Ye, Wei-Min; Cui, Yu-Jun; Qian, Li-Xin; Chen, Bao

GMZ bentonite has been considered as a possible material for engineered barrier in the Chinese program of nuclear waste disposal at great depth. In the present work, the hydraulic conductivity of this bentonite was determined by simultaneous profile method. A specific infiltration cell equipped with...

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187

Acoustic cues to tonal contrasts in Mandarin: Implications for cochlear implants

Kuo, YC; Rosen, S; Faulkner, A

The present study systematically manipulated three acoustic cues-fundamental frequency (f0), amplitude envelope, and duration-to investigate their contributions to tonal contrasts in Mandarin. Simplified stimuli with all possible combinations of these three cues were presented for identification to ...

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189

Zheng, G.; Clark, S.J.; Brand, S.; Abram, R.A.

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190

Luo, Q.; Dai, D.C.; Yu, X.Y.; Qiu, Z.R.; Zhou, J.Y.; Yan, C.H.; Chen, Z.D.

Fluorescence interferometry is developed and applied to study ultrafast amplitude and phase dynamics for free-induction decay in powdered rare earth solids. The time-resolved phase dynamics of free-induction decay through-out the decaying process is accurately determined by using a novel dual-channe...

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191

Jamieson, M.J.; Ouerdane, H.

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192

Chong-Jun, J.; De La Rue, R. M.; Johnson, N. P.

Charged colloidal suspensions have been used as experimental models for the study of crystal nucleation. Here we propose that the technique of template-assisted colloidal self-assembly can be used to visualize the effects of defect propagation in atomic crystal films produced using epitaxial growth....

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193

Akkurt, I; Annand, JRM

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