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Search Results: 1 - 10 of 28227 matches for " Xianji Zhu "
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THE INTERANNUAL VARIATION OF MEDIUM-RANGE OSCILLATION CHARACTERISTICS IN THE UPPER TROPOSPHERE OVER THE SUBTROPICAL REGION

Lu Longhu,Chen Xianji,Zhu Fukang,

大气科学进展 , 1985,
Abstract:
Relationship between Rad51 G135C and G172T Variants and the Susceptibility to Cancer: A Meta-Analysis Involving 54 Case-Control Studies
Mengmeng Zhao, Pin Chen, Yanbin Dong, Xianji Zhu, Xilong Zhang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087259
Abstract: Background The associations between Rad51 gene polymorphisms (G135C and G172T) and risk of cancer have been investigated, but the results were inconclusive. To get a comprehensive evaluation of the association above, we performed a meta-analysis of published studies. Methods A computerized search of PubMed, Embase and Web of Knowledge databases for all relevant studies was performed and the data were analyzed in a meta-analysis. The overall odds ratio (OR) with the 95% confidence interval (95% CI) was calculated to assess the strength of the association between Rad51 polymorphisms and cancer risk. Data were analyzed using fixed- or random-effects model when appropriate. Sensitivity analysis and publication bias test were also estimated. Results Overall, a total of 54 case-control studies were included in the current meta-analysis, among which 42 studies with 19,142 cases and 20,363 controls for RAD51 G135C polymorphism and 12 studies with 6,646 cases and 6,783 controls for G172T polymorphism. For G135C polymorphism, the pooled results indicated that significantly increased risk was found in overall cancers (homozygote model: OR = 1.776, 95% CI = 1.288–2.449; allelic genetic model: OR = 1.169, 95% CI = 1.016–1.345; recessive model: OR = 1.946, 95% CI = 1.336–2.835), especially in breast cancer (homozygote model: OR = 1.498, 95% CI = 1.026–2.189; recessive model: OR = 1.732, 95% CI = 1.170–2.562). For G172T polymorphism, a decreased cancer risk was observed in head and neck cancer (homozygote model: OR = 0.621, 95% CI = 0.460–0.837; allelic genetic model: OR = 0.824, 95% CI = 0.716–0.948; recessive model: OR = 0.639, 95% CI = 0.488–0.837). Conclusions Our results suggested that the Rad51 G135C polymorphism is a candidate for susceptibility to overall cancers, especially to breast cancer, and that the Rad51 G172T might play a protective role in the development of head and neck cancer.
Research on Location Routing Problem (LRP) Based on Chaos Search (CS) and Empirical Analysis  [PDF]
Qian Zhang, Zhongming Shen, Xianji Zhang
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.31A014
Abstract:

Due to the problem complexity, simultaneous solution methods are limited. A hybrid algorithm is emphatically proposed for LRP. First, the customers are classified by clustering analysis with preference-fitting rules. Second, a chaos search (CS) algorithm for the optimal routes of LRP scheduling is presented in this paper. For the ergodicity and randomness of chaotic sequence, this CS architecture makes it possible to search the solution space easily, thus producing optimal solutions without local optimization. A case study using computer simulation showed that the CS system is simple and effective, which achieves significant improvement compared to a recent LRP with nonlinear constrained optimization solution. Lastly the pratical anlysis is presented relationship with regional logistics and its development in Fujian province.

TYPES AND RESEARCH DIRECTION OF BIOGENIC GAS IN CHINA
中国生物成因气的类型划分与研究方向

Li XianJi,Zhang ShuiChang,Zhu GuangYou,Liang YingBo,
李先奇[]
,张水昌[],朱光有[],梁英波[]

天然气地球科学 , 2005,
Abstract: Biogenic gas, originated from the organic matter's alteration by microorganism, is natural gas with high contents of CH4, which may be cosmically large-scale occur. Base on the pathway and mechanism of formation, biogenic gas was divided into five different sorts, as follow :early biogenic gas, low mature gas, late biogenic gas,secondary biogenic gas from degradation of crude oil and upgrading gas from secondary alteration of shallow oil and gas, which belonging to pristine and secondary biogenic gas respectively. Different sorts of biogenic gas may be identified according as the carbon isotope and the character of gas constituents. Because biogenic gas is in the shallow stratum, and easy to do exploitation; furthermore, because of the good quality and the lower exploration cost, biogenic gas should be given a great deal exploration prospecting. Although, there have been found about 30 biogenic gas reservoirs, a lot of them are small gas reservoirs except that in Qaidam basin. The mechanisms of formation and concentrate regulation about biogenic gas don't still understand absolutely. The evaluation of biogenic gas may not only provide the source of shallow gas and make theory of organic geochemistry fuller, but also help to tracing the pathway of oil and gas migration and discover new subtale oil reservoir and source rock. Consequently, along with the farther research of biogenic gas in geology and geochemistry, the scopes of oil and gas exploration prospecting will extend enormously.
thecurrentstatusofbirddiversityinyunnanprovince
yang,lan,wen,xianji,yang,xiaojun
生物多样性 , 1996,
Abstract:
Pillared layered transition metal oxides
Xianji Guo,Wenhua Hou,Qijie Yan,Yi Chen
Chinese Science Bulletin , 2003, DOI: 10.1360/03tb9021
Abstract: This paper reviews the recent progress in the synthesis and application of pillared transition metal oxides during the last decade, mainly concerning the synthetic methods, structures, physical properties and catalytic applications of the layered transition metal oxides pillared by inorganic oxides. The factors and their affecting regularity in the process of preparation, and some important results obtained in the catalytic application studies are summarized. Finally, a prospect on the potential new directions in this research area is also presented.
POSTNATAL GROWTH OF THE SKELETAL SYSTEM OF LADY AMHERST''''S PHEASANT (Chrysolophus amherstiae) IN CAPTIVITY
笼养白腹锦鸡幼鸟骨骼系统生长的研究

Wen Xianji Yang Lan,
文贤继
,杨岚

动物学研究 , 1991,
Abstract: With the method developed by Dingerkus and Uhler (1977) the author prepared 30 skeletal specimens of the Lady Amherst's Pheasant (Chrysolophus amherstiae) chick at different age. In this paper the author discribed the skeletal postnatal growth and fusion from 1 to 143 day old; reported some bones growth equations from 1 to 41 day old; and discussed significance of the growth modes to chicks survival. Fig. 1,2,3,4,5,6,7 show the process of ossification and fusion of the bones of skull, mandible, sternum, pelvie girdle, pygostyle, carpus bones and metacarpals, tibia and metatarsals with tarsals from 1 to 143 day old. From 1 to 41 day old, the growth modles of all bones which were measured are Y = a + bx (parameters a , b see table 1 ), while the growth equations of body weight are: : Y = 3.1267 + 0.0096x2; : Y = 4.0692+0.0109x2. The seqence of development and growth is: in the peroid of hatehing the brain and feeding structure (premaxilla, maxilla and mandible etc.) develop most completely in all bones which were measured, the lower limb develop more completely than upper limb; in the 41 day postnatal growth, the growth rate of upper limb is the fastest in all bones which were measured, but the growth rate of body weight is not constant, the older the chicks are, the faster the body weights grow.
Bloch-like waves in random-walk potentials based on supersymmetry
Sunkyu Yu,Xianji Piao,Jiho Hong,Namkyoo Park
Physics , 2015, DOI: 10.1038/ncomms9269
Abstract: Bloch's theorem was a major milestone that established the principle of bandgaps in crystals. Although it was once believed that bandgaps could form only under conditions of periodicity and long-range correlations for Bloch's theorem, this restriction was disproven by the discoveries of amorphous media and quasicrystals. While network and liquid models have been suggested for the interpretation of Bloch-like waves in disordered media, these approaches based on searching for random networks with bandgaps have failed in the deterministic creation of bandgaps. Here, we reveal a deterministic pathway to bandgaps in random-walk potentials by applying the notion of supersymmetry to the wave equation. Inspired by isospectrality, we follow a methodology in contrast to previous methods: we transform order into disorder while preserving bandgaps. Our approach enables the formation of bandgaps in extremely-disordered potentials analogous to Brownian motion, and also allows the tuning of correlations while maintaining identical bandgaps, thereby creating a family of potentials with 'Bloch-like eigenstates'.
One-Way Optical Transition based on Causality in Momentum Space
Sunkyu Yu,Xianji Piao,KyungWan Yoo,Jonghwa Shin,Namkyoo Park
Physics , 2014, DOI: 10.1364/OE.23.024997
Abstract: The concept of parity-time (PT) symmetry has been used to identify a novel route to nonreciprocal dynamics in optical momentum space, imposing the directionality on the flow of light. Whereas PT-symmetric potentials have been implemented under the requirement of V(x) = V*(-x), this precondition has only been interpreted within the mathematical frame for the symmetry of Hamiltonians and has not been directly linked to nonreciprocity. Here, within the context of light-matter interactions, we develop an alternative route to nonreciprocity in momentum space by employing the concept of causality. We demonstrate that potentials with real and causal momentum spectra produce unidirectional transitions of optical states inside the k-continuum, which corresponds to an exceptional point on the degree of PT-symmetry. Our analysis reveals a critical link between non-Hermitian problems and spectral theory and enables the multi-dimensional manipulation of optical states, in contrast to one-dimensional control from the use of a Schrodinger-like equation in previous PT-symmetric optics.
Metadisorder for designer light in random-walk systems
Sunkyu Yu,Xianji Piao,Jiho Hong,Namkyoo Park
Physics , 2015,
Abstract: Disorder plays a critical role in signal transport, by controlling the correlation of systems. In wave physics, disordered potentials suppress wave transport due to their localized eigenstates from random-walk scattering. Although the variation of localization with tunable disorder has been intensively studied as a bridge between ordered and disordered media, the general trend of disorder-enhanced localization has remained unchanged, failing in envisaging the existence of delocalization in highly-disordered potentials. Here, we propose the concept of 'metadisorder': tunable random-walk systems having a designed eigenstate with unnatural localization. We demonstrate that one of the eigenstates in a randomly-coupled system can always be arbitrarily molded, regardless of the degree of disorder, by adjusting the self-energy of each element. Ordered waves are then achieved in highly-disordered systems, including planewaves and globally- collective resonances. We also devise counterintuitive functionalities in disordered systems, such as 'small-world-like' transport from non-Anderson-type localization, phase-conserving disorder, and phase-controlled beam steering.
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