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Search Results: 1 - 10 of 49643 matches for " JI Xue-ping "
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Direct perturbation method applied to three-dimensional nonlinear Schr?dinger equation
三维非线性Schr?dinger方程的直接微扰方法

Cheng Xue-Ping,Lin Ji,Han Ping,
程雪苹
,林机,韩平

物理学报 , 2010,
Abstract: By applying the direct perturbation method to the 3-dimensional nonlinear Schr dinger equation with perturbation, we obtain its asymptotical solutions, which contain not only the zero-order solutions, but also the first-order corrections. Through these solutions, the effect of perturbation on the soliton is analyzed as well.
Direct perturbation method for perturbed complex Burgers equation

Cheng Xue-Ping,Lin Ji,Yao Jian-Ming,

中国物理 B , 2009,
Abstract: So far, Lou's direct perturbation method has been applied successfully to solve the nonlinear Schr?dinger equation(NLSE) hierarchy, such as the NLSE, the coupled NLSE, the critical NLSE, and the derivative NLSE. But to our knowledge, this method for other types of perturbed nonlinear evolution equations has still been lacking. In this paper, Lou's direct perturbation method is applied to the study of perturbed complex Burgers equation. By this method, we calculate not only the zero-order adiabatic solution, but also the first order modification.
The Genetic Study on the Patrilineal and Matrilineal Origin of the Bo People in Yunnan
云南bo人源流的父系和母系遗传研究

SHI Hong,LI Yi,LUO Hong,JI Xue-ping,SU Bing,
石宏

动物学研究 , 2006,
Abstract: The Y chromosome and mtDNA from 32 male samples of Bo people were typed. The results showed that the Bo people originated from the south of China possessing the dominant patrilineal and matrilineal haplotypes that are prevalent in the southern East Asian populations. The multidimensional scaling analysis on the Bo people's hapoltypes, combined with published Y chromosome and mtDNA data from East Asian populations, demonstrated that the Bo people are genetically closer to the southern populations than to the northern. This indicates that the Bo people are descendants of a southern China origin population, which is consistent with archeological evidence. The genetic dissection of the Bo people sheds new light on the origin and dispersion of the prehistoric ``cliff coffin' culture.
Asymptotic solutions of perturbed N-component nonlinear Schr?dinger equations
微扰的耦合非线性薛定谔方程的近似求解

Cheng Xue-Ping,Lin Ji,Wang Zhi-Ping,
程雪苹
,林机,王志平

物理学报 , 2007,
Abstract: 将直接微扰方法应用于可积的含修正项的非线性薛定谔方程,通过近似解与精确解的比较确定了直接微扰方法的可靠性.继而,将该方法应用于微扰的耦合非线性薛定谔方程,并获得了该微扰方程的可靠的近似解.
Asymptotical solutions of coupled nonlinear Schr?dinger equations with perturbations
Asymptotical solutions of coupled nonlinear Schrodinger equations with perturbations

Cheng Xue-Ping,Lin Ji,Ye Li-Jun,
程雪苹
,林机,叶丽军

中国物理 B , 2007,
Abstract: In this paper Lou's direct perturbation method is applied to the perturbed coupled nonlinear Schr\"{odinger equations to obtain their asymptotical solutions, which include not only the zero-order solutions but also the first-order modifications. Based on the asymptotical solutions, the effects of perturbations on soliton parameters and the collision between two solitons are then discussed in brief. Furthermore, we directly simulate the perturbed coupled nonlinear Schr\"{odinger equations by split-step Fourier method to check the validity of the direct perturbation method. It turns out that our analytical results are well supported by the numerical calculations.
Ultrastructure of the Spermatozoon of the Northern Grass Lizard (Takydromus septentrionalis) with Comments on the Variability of Sperm Morphology Among Lizard Taxa
北草蜥精子的超微结构——兼评不同类群蜥蜴精子形态的差异

ZHANG Yong-pu,YING Xue-ping,JI Xiang,
张永普
,应雪萍,计翔

动物学研究 , 2005,
Abstract: We studied the ultrastructure of the spermatozoon of northern grass lizards ( Takydromus septentrionalis , n = 5) collected in April 2003 from a population in Wenzhou, Zhejiang, eastern China. The mature spermatozoa are characterized by: A circular acrosome; an acrosomal vesicle divided into cortex and medulla; the unilateral ridge of the acrosome vesicle divided into cortex and medulla, the electron-lucent zone between them; a prenuclear perforatorium, absence of the perforatorium base plate; presence of the subacrosomal space; an elongated nucleus, absence of a endonuclear canal; absence of epinuclear lucent zone; rounded nuclear shoulders. A bilateral stratified laminar structure within the neck region. A short midpiece; absence of multilaminar membranes; in longitudinal section, two tiers of mitochondria, in transverse section, six mitochondria with linear cristae; the presence of two dense body groups, the ring structure consisting of the complete ring; the arrangement pattern of the ring structure and mitochondria in rsl/mil and rs2/mi2; a fibrous sheath in the midpiece; presence of an annulus. A thin granular zone of cytoplasm at the anterior portion of the principal piece; the enlarged fiber 3 and fiber 8 disappearing at the anterior portion of the principal piece; the axoneme complex having an usual 9 + 2 pattern. Within lacertid lizards, sperms differ among species in the number of mitochondria, but in all species studied so far, there are two groups of dense bodies. However, lizards of different taxa differ, in various degrees, in such sperm morphological traits as acrosome vesicle, subacrosomal space, epinuclear lucent zone, perforatorium base plate, nuclear shoulder and number and arrangement of mitochondria and dense bodies. These differences suggest that sperm morphology provides additional information which one may use to study the phylogeny of lizards.
Lifelong Vocational Education for Sustainable Development
面向可持续发展的终身职业教育

WU Xue-ping,
吴雪萍

浙江大学学报(人文社会科学版) , 2007,
Abstract: Promoting the employment of the work force and the development of human resources is an important issue that needs to be resolved in China.It is also crucial to building a well-off society.Premier Wen Jiabao emphasizes the importance of vocational education in a speech delivered at the National Conference on Vocational Education.China's economic development and employment is facing two great changes: both employment of the work force and optimization of the industrial structure are in need of skilled workers.Therefore,China will have to devote great effort to developing vocational education.Developing lifelong vocational education plays an important role in promoting the development of human resources,the employment of labor force,the sustainable development and enhancing the country's competitive power.The idea of lifelong vocational education comes from the idea of lifelong education.It is a new perception of vocational education.It breaks the restrictions of time and space in the narrow sense of vocational education.According to the idea of lifelong vocational education,vocational education should run throughout one's life to provide help for one's whole career development and should be an integration of all kinds of vocational education in different places.Lifelong education has the features of continuation,integration,flexibility,openness and change.Developing lifelong vocational education is a complex work that needs social participation.The basic strategies for developing lifelong vocational education include law assurance,policy control,flexible fund raising,social participation and encouragement for lifelong learning.In law assurance,regulations for lifelong vocational education may be made according to the Vocational Education Act of the P.R.China and local acts may be enacted.In policy-making,there are many aspects as establishing and coordinating the institutions of lifelong vocational education,strengthening the functions of educational departments,building opening schools and providing learning holidays.In flexible fund raising,funding system that combines special grants from governments,funds from industries, funds from society and individual learning accounts may be established.In social participation,platform for participation can be set up and activities for creating learning organizations can be launched.The main forms of lifelong learning encouragement include providing opportunities for development,spiritual awards,economic benefits and qualification accreditation.
Smoothness and high energy asymptotics of the spectral shift function in many-body scattering
Andras Vasy,Xue-Ping Wang
Physics , 2001,
Abstract: Let H=\Delta+\sum_{#a=2} V_a be a 3-body Hamiltonian, H_a the subsystem Hamiltonians, \Delta the positive Laplacian of the Euclidean metric on X_0=R^n, V_a real-valued. Buslaev and Merkurev have shown that, if the pair potentials decay sufficiently fast, for \phi smooth and compactly supported, the operator \phi(H)-\phi(H_0)-\sum_{#a=2}(\phi(H_a)-\phi(H_0)) is trace class. Hence, one can define a modified spectral shift function \sigma, as a distribution on R, by taking its trace. In this paper we show that if V_a are Schwartz, then \sigma is in fact smooth away from the thresholds, and obtain its high energy asymptotics. In addition, we generalize this result to N-body scattering, N arbitrary.
PCDD/F Formation and Its Mass Balance in a MSW Incineration System
城市生活垃圾焚烧系统中二英的生成与质量平衡

ZHANG Hai-jun,NI Yu-wen,ZHANG Xue-ping,ZHANG Qing,ZHAO Liang,ZHANG Ning,CHEN Ji-ping,
张海军
,倪余文,张雪萍,张青,赵亮,张宁,陈吉平

环境科学 , 2008,
Abstract: PCDD/F distributions in a two-stage reciprocating grate municipal solid waste (MSW) incinerator under two kinds of operating conditions were investigated by sampling the ashes, flue gases and bottom ashes at different positions, and the mass balance was calculated. At the boiler outlet, the concentration of PCDD/F in the flue gas is 2.602 ng x m(-3) and 1.236 ng x m(-3) under operating condition 1 (RUNI) and operating condition 2 (RUN2), respectively. A significant formation of PCDD/F was found in the sections of semi-dry scrubber (SDS) and cyclone precipitator (CP), in which the temperature of flue gas was in the range of 260-180 degrees C. Compared with PCDD/F level measured at the boiler outlet, the total concentration of tetra-to octa-CDD/F measured at the CP outlet increased 82.2% and 17.6% under RUN1 and RUN2, respectively. At the bag filter (BF) section, about 90% of PCDD/F was removed from the flue gas by the precipitation of fly ash. The PCDD/F homologue patterns were almost similar for the boiler ash, CP ash, BF ash and the flue gases. The higher O2 content in flue gas led to a larger PCDD/F yield, but the variation of O2 level did not give rise to a systematical change of PCDD/F homologue pattern. Under RUN1, 10.4%, 3.2%, 9.3%, 64.1% and 13.0% of formed tetra-to octa-CDD/F were distributed into bottom ash, boiler ash, CP ash, BF ash and emission gas, respectively. The corresponding values were 8.6%, 8.0%, 9.4%, 66.7% and 7.3% for RUN2, respectively.
Patterns of PCDD/Fs,PCBs and PCNs Homologues in Fly Ash from Cement Kilns
水泥窑除尘器捕集灰中PCDD/Fs、PCBs和PCNs的分布特征

ZHANG Jing,NI Yu-wen,ZHANG Hai-jun,ZHANG Xue-ping,ZHANG Qing,CHEN Ji-ping,
张婧
,倪余文,张海军,张雪萍,张青,陈吉平

环境科学 , 2009,
Abstract: 应用同位素稀释、高分辨气相色谱-质谱联用技术测定了国内3种类型水泥窑(机械立窑、湿法旋窑和新型干法旋窑)以及生活垃圾焚烧炉和医疗垃圾焚烧炉的除尘器捕集灰中PCDD/Fs、PCBs和PCNs的浓度和毒性当量,比较了同族体和同类物的分布特征.结果表明,水泥窑除尘器捕集灰中二英及其类似物PCDD/Fs、PCBs和PCNs的总毒性当量(以TEQ计)分别在4.0~62、 0.069~3.9和0.47~2.8 ng·kg-1之间,远小于垃圾焚烧炉除尘器捕集灰.占优势的PCDD/Fs同族体都是TCDFs,相对较多的2, 3, 7, 8位氯取代二英同类物有OCDD、 2,3,7,8-TCDF、 1,2,3,4,6,7,8-HpCDF;水泥窑除尘器捕集灰中PCBs同族体的分布特征与垃圾炉相似,占优势的同族体都是四氯联苯,含量较高的共平面PCBs同类物有PCB77、PCB105、PCB118;不同窑型水泥窑除尘器捕集灰中PCNs同族体分布特征相似,占优势的同族体都是四氯萘,没有检测到八氯萘的存在,含量较高的二英类毒性PCNs同类物是毒性最大的PCN 66/67.
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