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Search Results: 1 - 10 of 42687 matches for " XU ZhiQin "
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Theoretical Exploration and Practice of the Funding for Educations in China  [PDF]
Huizhong Xu, Zhiqin Ben, Jie Deng
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.54026
Abstract:

Chinese current funding systems have basically solved the economic distress of poor students’ right to receiving educations, but there are still many problems and shortcomings, such as the unclear funding concepts, the disjunction of the funding and education, low performance of the funding for education. From the capital theory, funding includes the three investment areas: cultural capital, human capital and social capital, which show us a new perspective to make clear the intrinsic link between the funding and education and provide a theoretical basis. Therefore, we can totally improve the performance of the funding for education through the three aspects: protecting cultural capital to meet the educational needs, enhancing human capital to meet the needs of self-development and accumulating social capital to meet the needs of the upward social mobility.

Bifurcations of a Homoclinic Orbit to Saddle-Center in Reversible Systems
Zhiqin Qiao,Yancong Xu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/678252
Abstract: The bifurcations near a primary homoclinic orbit to a saddle-center are investigated in a 4-dimensional reversible system. By establishing a new kind of local moving frame along the primary homoclinic orbit and using the Melnikov functions, the existence and nonexistence of 1-homoclinic orbit and 1-periodic orbit, including symmetric 1-homoclinic orbit and 1-periodic orbit, and their corresponding codimension 1 orcodimension 3 surfaces, are obtained.
Fluid inclusions hidden in coesite-bearing zircons in ultrahigh-pressure metamorphic rocks from southwestern Sulu terrane in eastern China
Fulai Liu,Zhiqin Xu
Chinese Science Bulletin , 2004, DOI: 10.1007/BF02900324
Abstract: Primary fluid inclusions, together with coesite mineral inclusions, are identified in the same zircon domains by laser Raman spectroscopy, cathodoluminescence (CL) image and micro-texture analysis in paragneiss and eclogite from the main drilling hole of Chinese Continental Scientific Drilling Project in southwestern Sulu terrane. Most fluid inclusions are characterized by CO2 (gas)-H2O (liquid) two-phase, a few by H2O one-phase liquid inclusions. These features indicate that the eclogite and its country-rocks may be located in the “wet system” rather than in the “dry system” during UHP metamorphism. SHRIMP U-Pb dating indicates that the timing of trapping the fluid and coesite inclusions in metamorphic zircon domains is about 233.7 ±4.3 Ma, which may represent the age of zircon growth in the stage of pressure decrease but temperature increase during the retrograde period of UHP metamorphism thus indicating the fluid activity still under the UHP conditions. The zircons further overgrew at about 213.2 ±5.2 Ma in response to amphibolite-facies retrogression. Therefore, fluid activity in the Sulu UHP metamorphic rocks principally occurred during the exhumation of UHP slab in the Middle to Late Triassic. The present results not only provide insight into the fluid property and fluid-rock interaction mechanism in the Sulu-Dabie UHP terrane, but also present a new means to exactly identify the primary fluid inclusions preserved in zircons from the UHP metamorphic rocks.
Continental deep subduction and exhumation dynamics: Evidence from the main hole of the Chinese Continental Scientific Drilling and the Sulu HP-UHP metamorphic terrane
深俯冲和折返动力学:来自中国大陆科学钻探主孔及苏鲁超高压变质带的制约

XU ZhiQin,
许志琴

岩石学报 , 2007,
Abstract: 中国大陆科学钻探工程和苏鲁高压-超高压变质带为大陆岩石圈的深俯冲与折返动力学的研究提供了以下制约:(1)苏鲁高压/超高压变质地体迭置于南、北苏鲁两个不同时代及属性的基底之上;(2)苏鲁巨量表壳岩石深俯冲至200km以下的上地幔深度,并经历超高压变质作用;(3)根据不同类型超高压变质岩石锆石的SHRIMP-U/Pb原位精确定年,获得超高压变质岩石的深俯冲-折返全过程(240~252Ma→230~237Ma→207~218Ma)时限.并建立了新的深俯冲-折返全过程的P-T-t轨迹;(4)富钛铁的辉长岩在大陆地壳的深俯冲过程中,经历了超高压变质作用并转变成了富含金红石的榴辉岩,形成了超高压变质的钛矿床;(5)通过榴辉岩和石榴石橄榄岩的显微构造分析及石榴石、绿辉石和橄榄石EBSD测量,确定深俯冲过程中绿辉石和橄榄石的组构运动学和流变学特征;(6)在大陆的深俯冲过程中,强烈水化的陆壳岩石经历了进变质脱水过程,巨量的地表水带入到>100~200Km的地幔深处,在超高压变质峰期的极端条件下,通过含水超高压变质矿物的分解形成超临界的含水熔体,导致有效的壳-幔物质交换和岩石圈物质分异;(7)苏鲁超高压变质地体在折返阶段形成挤出纳布构造,与岩石圈深俯冲管道流的折返挤出机制有关;(8)提出新的深俯冲-折返动力学模式:陆.陆碰撞的深俯冲剥蚀模式及大陆地壳多重性、分层型和穿时性的俯冲和折返模式.
Estimation of Genetic Parameters for 305 Days Milk Yields and Calving Interval in Xinjiang Brown Cattle  [PDF]
Xuefeng Fu, Lili Lu, Xixia Huang, Yachun Wang, Kechuan Tian, Xinming Xu, Jiqing Fang, Liming Cheng, Zhiqin Guo, Yuezhen Tian
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2017.81004
Abstract: This study was conducted to estimate variance components and genetic parameters for 305 days mature equivalent milk yields (MEM) and calving interval (CAI) of registered Xinjiang Brown cattle. The total records were 3940 including 2579 for 305-day MEM and 1970 for CAI, which were collected from Xinjiang Urumqi Cattle Breeding farm in China with calving records from 1990 to 2008. Genetic parameters were obtained by multiple trait derivative-free restricted maximum likelihood (MTDFREML) using animal model. The model included year, season, parity and calving interval of calving for 305 days MEM, and year, season and parity of birth for CAI as fixed effects. Heritability for 305 days MEM was moderate (0.39) and in the same range of parameters estimated in management systems with medium production levels. Heritability of calving interval was small (0.02) as fertility traits for Xinjiang Brown cattle. Estimates of genetic and environmental correlations between 305 days MEM and CAI were 0.47 and 0.37, respectively. Estimates of genetic variation and heritability indicated that selection would result in genetic improvement of production traits. Estimates of both heritability and genetic variation for CAI were small, which indicates that genetic improvement would be difficult.
On a Periodic Predator-Prey System with Holling III Functional Response and Stage Structure for Prey
Xiangzeng Kong,Zhiqin Chen,Li Xu,Wensheng Yang
Abstract and Applied Analysis , 2010, DOI: 10.1155/2010/161978
Abstract: We propose and study the permanence of the following periodic HollingIII predator-prey system with stage structure for prey and both two predators whichconsume immature prey. Sufficient and necessary conditions which guarantee thepredator and the prey species to be permanent are obtained.
Tomographical evidence for Indian Plate underthrusting only beneath Tethyan Himalaya
Qingtian Lu,Mei Jiang,Zhiqin Xu,Kaiyi Ma,A. Hirn
Chinese Science Bulletin , 1999, DOI: 10.1007/BF03182894
Abstract: Tomographical inversion was performed using the data recorded by 51 seismographys deployed on a profile that followed southern Xizang (Tibet) high-way through a Sino-French Joint seismic experiment. The results indicate that the underthrusting Indian Plate is limited to the south of Indus-Yarlung Zangbo Suture (IYS) beneath Tethyan Himalaya, extends vertically to 150 km deep with relatively high angle near Gala, and becomes horizontally northward. The seismic velocities beneath Kangmar, Gangdise and Yangbajain-Golug rift in the middle of the lithosphere show low velocity features, which may indicate the existence of high temperature and partial melting. The results from tomography strongly suggest that the continent-continent subduction occurred only beneath Himalaya and was confined to the south of IYS since the collision between India and Eurasia.
The ages of U-Pb and Sm-Nd for eclogite from the western segment of Altyn Tagh tectonic belt
Jianxin Zhang,Zeming Zhang,Zhiqin Xu,Jingsui Yang,Junwen Cui
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885933
Abstract: The eclogites of Altyn Tagh tectonic belt occur as lens within gneisses characterized by amphibolite-facies mineral parageneses. The well-preserved eclogite is selected for Sm-Nd and U-Pb isotopic dating. The Sm-Nd isotopic data yield a whole rock-garnet-omphacite isochron of (500 ± 10) Ma. The U-Pb isotopic measurements of zircons show that the four grain populations are nearly concordant and well plotted on concordia curves, giving a weighted mean age (503.9 ± 5.3) Ma. Two kinds of methods obtain a similar age which reveals the peak metamorphic age of eclogites, and reflect the existence of orogenic root related to Caledonian subduction and continent-continent collision.
Synthesis of 1-isopropyl-3-acyl-5-methyl-benzimidazolone Derivatives and Their Antimicrobial Activity
Nan Xu,Chunnan Yang,Xinqi Gan,Shaopeng Wei,Zhiqin Ji
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14046790
Abstract: A series of N-acylated analogues of 1-isopropyl-3-acyl-5-methyl-benzimidazolone were synthesized. Bioassay results indicated that analogues 5-07 and 5-19 exhibited the most potency against Bacillus cereus, Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Analogues 5-02, 5-07, 5-12, 5-15, 5-19, 5-20 and 5-25 could effectively inhibit the spore germination of Botrytis cinerea. The relationship between structure and their antimicrobial activity (SAR) has also been discussed according to aliphatic acids and aromatic acids derivatives, respectively. This implied that the N-acylated derivatives of 5-methyl-benzimidazolone might be potential antimicrobial agents.
Granger Causality Network Reconstruction of Conductance-Based Integrate-and-Fire Neuronal Systems
Douglas Zhou, Yanyang Xiao, Yaoyu Zhang, Zhiqin Xu, David Cai
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087636
Abstract: Reconstruction of anatomical connectivity from measured dynamical activities of coupled neurons is one of the fundamental issues in the understanding of structure-function relationship of neuronal circuitry. Many approaches have been developed to address this issue based on either electrical or metabolic data observed in experiment. The Granger causality (GC) analysis remains one of the major approaches to explore the dynamical causal connectivity among individual neurons or neuronal populations. However, it is yet to be clarified how such causal connectivity, i.e., the GC connectivity, can be mapped to the underlying anatomical connectivity in neuronal networks. We perform the GC analysis on the conductance-based integrate-and-fire (IF) neuronal networks to obtain their causal connectivity. Through numerical experiments, we find that the underlying synaptic connectivity amongst individual neurons or subnetworks, can be successfully reconstructed by the GC connectivity constructed from voltage time series. Furthermore, this reconstruction is insensitive to dynamical regimes and can be achieved without perturbing systems and prior knowledge of neuronal model parameters. Surprisingly, the synaptic connectivity can even be reconstructed by merely knowing the raster of systems, i.e., spike timing of neurons. Using spike-triggered correlation techniques, we establish a direct mapping between the causal connectivity and the synaptic connectivity for the conductance-based IF neuronal networks, and show the GC is quadratically related to the coupling strength. The theoretical approach we develop here may provide a framework for examining the validity of the GC analysis in other settings.
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