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Search Results: 1 - 10 of 112119 matches for " CHEN Chang-ping "
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Improved QAPF scheduling algorithm in relay networks

CHEN Bo,DU Chang-ping,TANG Lun,

计算机应用研究 , 2011,
Abstract: 本文针对QAPF调度算法存在的吞吐量与公平性矛盾的问题,提出了一种改进的QAPF调度准则(RQAPF),该准则利用队列门限值降低了队列状态信息对调度准则的影响,保证了用户的公平性。但与QAPF调度准则相比,降低了系统吞吐量,进一步提出了具有载波配对的RQAPF调度算法(SubPairRQAPF),仿真表明该算法在满足系统公平性要求的同时能够提高频谱利用率。
Influences of Salinity on the Growth and Some Ecophysiological Characteristics of Mangrove Species,Sonneratia apetala Seedlings

CHEN Chang-Ping,WANG Wen-Qing,LIN Peng,

植物学报 , 2000,
Abstract: 本文研究了盐度(0‰~50‰)对无瓣海桑幼苗生长的影响。盐度对无瓣海桑幼苗长叶数、茎长、植株鲜重、主根长、根系鲜重等方面起抑制作用;随盐度的提高,无瓣海桑幼苗成活率下降;但盐度对无瓣海桑幼苗叶片面积存在一个低盐(0‰~10‰)促进、高盐(15‰~40‰)抑制的过程;盐度对叶绿素含量的影响总趋势是随盐度提高,低盐时叶绿素含量下降,而当盐度超过10‰时上升。因此认为:1)无瓣海桑幼苗在无盐存在下,也可正常生长;2)无瓣海桑具有较高的耐盐能力,在盐度0‰~25‰内可正常生长,超过25‰,其生长受到抑制。
Alternating-Current Transport Properties of the Interface between Nd0.7Sr0.3MnO3 Ceramic and a Ag Electrode

CHEN Shun-Sheng,YANG Chang-Ping,LUO Xiao-Jing,B rner K,Medvedeva I V,

中国物理快报 , 2012,
Two-dimensional photoelectron momentum distribution of hydrogen in intense laser field

Sun Chang-Ping,Zhao Song-Feng,Chen Jian-Hong,Zhou Xiao-Xin,

中国物理 B , 2011,
Abstract: Two-dimensional (2D) electron momentum distributions and energy spectra of a hydrogen in an intense laser field are calculated by solving the time-dependent Schr dinger equation combined with the window-operator technique. Compared with the standard projection technique, the window-operator technique has the advantage that the continuum states of atoms can be avoided in the calculation. We show that the 2D electron momentum distributions and the energy spectra from those two techniques accord quite well with each other if an appropriate energy width is used in the window operator.
The electrical transport properties of Ag/Nd0.7 Sr0.3 MnO3 ceramic interface

Chen Shun-Sheng,Huang Chang,Wang Rui-Long,Yang Chang-Ping,Medvedeva I,

物理学报 , 2011,
Abstract: The transport properties of interface between metal electrode and Nd0.7Sr0.3MnO3 bulk have been investigated under 2-wire measuring mode using permeating Ag and Ag-glue contact, respectively. The results show that, for the permeating Ag contact, the measured results are similar to that of 4-wire measurement, and an ohmic character is obtained without EPIR effect. However, a strongly nonlinear V-I curve appears and exhibits a stable EPIR effect for the Ag-glue contact. Besides, It also shows remarkable difference when loaded with alternating current for the two different kinds of contacts. For the former, the real part of impedance R' increases with increasing frequency which is attributable to the skin effect; for the latter, however, the R' is of about megohm order of magnitude and the R' peak decreases with increasing frequency. Moreover, the R' peak splits into two peaks which respectively move to high and low temperature when further increasing the frequency. In combination with the data of scanning electron microscopy, the differences of electrical transport are discussed.
The origin of EPIR effect in Nd0.7Sr0.3MnO3 ceramics

Yang Chang-Ping,Chen Shun-Sheng,Dai Qi,Song Xue-Ping,

物理学报 , 2011,
Abstract: Polycrystalline ceramic Nd0.7Sr0.3MnO3 is synthesized using high-energy ball milling and post heat treatment method. The properties of electric transport are measured using direct current (DC) 4-wire and 2-wire methods. The results show that both the grain (phase) boundary and the electrode-bulk contact interface has interfacial resistance and space charge layer. The two kinds of space charge regions have greatly different effects on the DC transport: for the former, the I-V curve exhibits nonlinear characteristic and no EPIR effect takes place; for the later, however, an obvious EPIR effect is observed even if the I-V curve also shows nonlinear behaviour. It well suggests that for the ceramic Nd0.7Sr0.3MnO3, only the electrode-bulk contact interface can induce the EPIR effect although there is a similar nonlinear I-V characteristic for the grain (phase) boundary and the electrode-bulk contact interface.


中国物理 B , 1997,
Abstract: Zeeman modulation-magnetic rotation spectroscopic (ZM-MRS) technique is provided with not only high sensitivity and high signal-to-noise ratio, but also apparent phase character for studying molecular spectrum. It is quite helpful for assigning some complex molecular rotational spectra. As an example, the ZM-MRS spectra of NO2 molecule was measured in the region between 16838cm-1 and 16860cm-1 with high resolution. The semi-classical magnetic rotation theory was used to explain the spectral feature and its phase relation with transition quantum number. It is in agreement with the experimental results. Finally, by using matrix diagonalization of effective Hamiltonian, the ZM-MRS spectra of NO2 molecule were analyzed and a reasonable assignment was obtained.
Microstructure dependence of the electroresistance of Nd0.7Sr0.3MnO3

Chen Shun-Sheng,Yang Chang-Ping,Deng Heng,Sun Zhi-Gang,

物理学报 , 2008,
Abstract: Nd0.7Sr0.3MnO3 ceramics of perovskite-type were respectively prepared by solid-state reaction and high-energy ball milling with post heating-treatment. The samples obtained using these methods show a great of difference in electrical transport despite having the same crystallographic structure, similar grain size and chemical composition. For the sample prepared by solid-state reaction, the electrical resistance keeps unchanged with current loads and no electroresistance effect takes place. However, for the sample prepared by high-energy ball milling with post heating treatment, the electrical resistance decreases remarkably with increasing current loads and shows colossal electroresistance effect. The microstructure of materials, in particular the screw dislocation-like structure, is supposed to be responsible for the difference in electrical transport.

CHEN Ming,LU Wen-bo,YI Chang-ping,TANG Hao,
陈 明
,卢文波,易长平,唐 浩

岩石力学与工程学报 , 2006,
Abstract: On the basis of the numerical simulation of dynamic finite element method(DFEM),the dynamic response of rock-anchored beam of large underground powerhouse under blasting vibration is studied.It is found that the key to ensure the safety of the rock-anchored beam under blasting vibration is to prevent the cracking of the bonding interface between the beam and the vertical rock wall,and to control the horizontal peak particle velocity,which is vertical to the side wall.Combined with the blasting vibration control practice of the rock-anchored beam at Longtan Hydropower Station,considering the comprehensive factors such as the structure characteristic of rock-anchored beam,the strength properties of concrete,the strength development with the increase of the cured age of young concrete,the microstructure and the strength of the bonding interface,the feasibility of rock excavation by blasting in underground powerhouse below the beam is studied under the condition that the cured age of concrete is no older than 28 d;the control standard of peak particle velocity(PPV) for rock-anchored beam in different cured ages is proposed.It is concluded that the PPV control standard for young concrete proposed by code could be used to rock-anchored beam with an age no older than 28 d;and the PPV of 7 cm/s for rock-anchored beam with an age older than 28 d has certain safety margin.
Electrochemical Characteristics of Ti/SnO2+Sb2O3/PbO2 Anode for the Oxidation of Cr3+ in Sulfuric Acid Solution

WANG Ya-qiong,CHEN Chang-ping,TONG Hong-yang,XU Wen-lin,

过程工程学报 , 2003,
Abstract: The electrochemical characteristics of Ti/SnO2+Sb2O3/PbO2 anode prepared by the polymeric precursor method and thermal decomposition was studied with the electro-oxidation of Cr3+ in H2SO4 solution. The polarization curves of electrochemical oxidation of Cr3+ were determined and the resistance to corrosion was tested using Ti/SnO2+Sb2O3/PbO2 and PbO2 as anode respectively. The operation factors, such as current density, concentration of chromium, temperature and sulfuric acid concentration, which had effects on process current efficiency,were also studied. The experimental results showed that the Ti/SnO2+Sb2O3/PbO2 anode prepared by the polymeric precursor method and thermal decomposition had good resistance to corrosion. The current density of electrochemical oxidation of Cr3+ with Ti/SnO2+Sb2O3/PbO2 anode was 3~6 times higher than that with PbO2 anode at the same potential. The current efficiency of electrochemical oxidation of Cr3+ with Ti/SnO2+Sb2O3/PbO2 was much higher than that with PbO2 anode at the same reaction conditions. The Ti/SnO2+Sb2O3/PbO2 anode demonstrated good electrocatalysis performance.
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