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Search Results: 1 - 10 of 130631 matches for " LI Ze-zhuang "
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Catalytic performances of Co/SiO2 prepared through thermal decomposition for Fischer-Tropsch synthesis

LI Ze-zhuang,CHEN Jian-gang,WANG Yue-lun,SUN Yu-han,

燃料化学学报 , 2011,
Abstract: Cobalt based catalysts supported on amorphous SiO2 were prepared through thermal decomposition as well as incipient wetness impregnation.They were characterized by means of TG,XRD,TEM and TPR and used in Fischer-Tropsch(F-T) synthesis.The results indicated that Co/A200-I catalyst prepared by impregnation exhibits high F-T synthesis activity,though cobalt particles in it are in irregular shape.In comparison,the cobalt particles in Co/A200-D catalyst prepared through decomposition are in secondary spherical s...

Pan Ze-hui Liu Xin-tian Li Xin-hua Yao Xin-mei Zhuang Ti-de,

植物分类学报 , 1997,
Abstract: 本文报道了山芹属Ostericum 5种1变种13个居群的核型,其中4种为首次报道。其核型如下:隔山香 O.citriodorum 广东宝安的居群,2n=22=16m+6sm;江西鹰潭的居群,2n=22=14m+6sm+2st;华东山芹 O.huadongensis本所药物园居群,2n=22=16m+6sm;安徽广德的居群,2n=22=16m+4sm+2sm(SAT);绿花山芹 O.viridiflorum内蒙古额右旗的居群,2n=22=18m+4sm;黑龙江双鸭山居群,2n=22=18m+2sm+2st(SAT);山芹 O.sieboldii 辽宁庄河居群,2n=22=4sm+16st+2st(SAT);吉林长白山居群,2n+22+2sm+20st;狭叶山芹 O. sieboldii var.praetieritum 辽宁鞍山的居群,2n=22=2sm+20st;大齿山芹 O.grosseserratum 辽宁庄河居群,2n=18=2sm+16st;江苏宜兴居群,2n=18=2sm+16st;安徽广德居群,2n=18=18st;浙江天目山居群,2n=18=18st。隔山香、华东山芹和绿花山芹具较原始的2A型,山芹和大齿山芹则具较为进化的4A型。此外,大齿山芹具有下行性的染色体基数n=9,这在整个前胡族中都具独特性。根据各居群在种分布区内的核型演化方向及现代地理分布格局并结合形态和孢粉学资料,提出本属的起源是从近缘的当归属起源地横断山区沿着东北和东南两个方向迁移扩散,演化发展形成两个现代次生分布中心,一个是东北向具温带性广布型的分布中心(东北地区),另一个是东南向具亚热带性特有种型的分布中心(华东地区),两个分布中心之间有一个分化活跃、演化最高的纽带种一大齿山芹。
Asymptotic stability of solitons to 1D Nonlinear Schrodinger Equations in subcritical case
Ze Li
Mathematics , 2015,
Abstract: In this paper, we prove the asymptotic stability of solitons to 1D nonlinear Schr\"odiger equations in subcritical case with some spectral assumptions. Although pure power nonlinearities are not included in our theorem because of the failure of spectral hypothesis, our work throws light on how to deal with weak nonlinearity. Since dispersive methods mostly need a high power nonlinearity, we develop a commutator method which dates back to the work of S. Cuccagna, V. Georgiev, N. Visciglia \cite{CGV}.
The characteristics and formation of the submarine topography in the Liaodong Bay, the Bohai Sea

LUAN Zhen-dong,LI Ze-wen,FAN Feng-xin,YAN Jun,ZHUANG Li-hua,
,李泽文,范奉鑫,阎 军,庄丽华

海洋科学 , 2012,
Abstract: The Liaodong Bay of the Bohai, rich in oil, has been investigated by a large number of geologists, but most of research was focus on structural geology. Through the survey by single beam echo-sounder system, the submarine topography of the Liaodong Bay was studied. Topographical features of the seabed topography in the Liaodong Bay were divided into five sub-zones, and factors affecting the development of terrain in the Liaodong Bay were also discussed. The formation of topography in the Liaodong Bay is affected by structural geology condition, hydrodynamic condition, and sediment supply.
The Resuming Insulation Discharge Failure and Conductor Overheating Failure Judgment Method of SF6 Electrical Equipment  [PDF]
Xiansheng ZHUANG, Zhi LI, Chengji HUANG
Energy and Power Engineering (EPE) , 2009, DOI: 10.4236/epe.2009.12019
Abstract: Through the long time track examination and disintegration to SF6 circuit breaker, we obtain the massive monitor data and massive pictures. The criteria of resuming insulation discharge failure conforming to CSO2/CH2S>7, is quite broad to SO2 and the H2S concentration permission. Even if it reaches 100µL/L, it will not be in danger immediately to the safe operation of equipment. We may plan, arrange, and overhaul calmly. When obtaining the bare conductor overheating failure, it has not involved the resuming insulation. We may use the resuming insulation discharge failure criterion.
A Study on Karyotypes and Geographical Distribution of Ostericum (Umbelliferae) in China

Pan Ze-hui,Liu Xin-tian,Li Xin-hua,Yao Xin-mei,Zhuang Ti-de,Lin Xiang,

中国科学院研究生院学报 , 1997,
Abstract: There are about 10 species of Ostericum in the world, of which seven are distributed in China. The present paper deals with the karyotypes of five species and one variety (covering 13 populations) within this genus. The karyotype formulae are as follows: O. citriodorum (Hance) Yuan &Shan 2n=22= 16m+ 6sm (Baoan, Guangdong) and 2n= 22=14m + 6sm + 2st(Yingtan, Jiangxi); O. huadongensis Z. H. Pan & X. H. Li 2n = 22 =16m + 6sm (Nanjing, Jiangsu, cultivated) and 2n= 22 = 16m + 4sm + 2sm (SAT) (Guangde,Anhui); O. viridiflorum (Turcz.) Kitagawa 2n = 22 = 18m + 4sm (Ergun Youqi, Nei Mongol) and 2n = 22 = 18m + 2sm + 2st (SAT) (Shuangyashan, Heilongjiang); O. sieboldii (Miq.) Nakai 2n = 22 = 4sm + 16st + 2st (SAT) ( Zhuanghe, Liaoning ); and 2n = 22 = 2sm + 20st (Changbaishan, Jilin); O. sieboldii var. praeteritum (Kitagawa) Huang 2n = 22 =2sm+ 20st (Anshan, Liaoning); O. grosseserratum (Maxim.) Kitagawa 2n = 18 = 2sm +16st (Zhuanghe, Liaoning), 2n = 18 = 2sm + 16st (Yixing, Jiangsu), 2n = 18 = 18st(Guangde, Anhui) and 2n= 18=18st (Tianmushan, Zhejiang). The karyotypes of O. citriodorum, O. huadongensis and O. viridiflorum belong to 2A, while those of O. sieboldii and O. grosseserratum belong to 4A. Besides, O. grosseserratum has decreasing chromosome number (n = 9), which is very unique in the tribe Peucedaneae.Based on the karyotypes and geographical distribution of the species, as well as gross morphology and pollen morphology, we considered that there might be two secondary diversity centres of Ostericum in NE and E China, which have developed and migrated from the Hengduanshan region, the origin and diversity center the of related genus-Angelica.
Quantification of the distribution of blood flow pressure with postures  [PDF]
Wenying Mu, Shanguang Chen, Fengyuan Zhuang, Yinghui Li, Yu Li
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.53015
Abstract: At a different angle, this study analyzed the contour chart of blood flow pressure, extreme pressure and its position to quantify DBFP in thirteen different postures with gravity considered or not (G ≠ 0 or G = 0). The aim was to determine the suitable body positions, in which the postural model of a single vessel could be simplified to two-dimensional (2D) symmetrical one while only considering such factors as posture and gravity. Computational fluid dynamic simulations were performed. Numerical results demonstrated that the DBFP showed 2D axisymmetry at ±90° and three-dimensional (3D) asymmetry at any other posture with G ≠ 0, and 2D axisymmetrical one at any posture with G = 0. Therefore, modeling a vessel as a 2D model is feasible in space and at ±90° posture on earth. In addition, the maximum pressure occurred between the inlet and the middle of the vessel, and its position variation mainly happened in the range of 0° - 15°. For a single vessel, this study provides the first theoretical evidence for cardiovascular modeling in microgravity and may help guide the researchers in designing defense devices for astronauts or patients clinically.
An Extended Discrete Hardy-Littlewood-Sobolev Inequality
Ze Cheng,Congming Li
Mathematics , 2013,
Abstract: Hardy-Littlewood-Sobolev (HLS) Inequality fails in the "critical" case: \mu=n. However, for discrete HLS, we can derive a finite form of HLS inequality with logarithm correction for a critical case: \mu=n and p=q, by limiting the inequality on a finite domain. The best constant in the inequality and its corresponding solution, the optimizer, are studied. First, we obtain a sharp estimate for the best constant. Then for the optimizer, we prove the uniqueness and a symmetry property. This is achieved by proving that the corresponding Euler-Lagrange equation has a unique nontrivial nonnegative critical point. Also, by using a discrete version of maximum principle, we prove certain monotonicity of this optimizer.
Shooting Method with Sign-Changing Nonlinearity
Ze Cheng,Congming Li
Mathematics , 2014,
Abstract: In this paper, we study the existence of solution to a nonlinear system: \begin{align} \left\{\begin{array}{cl} -\Delta u_{i} = f_{i}(u) & \text{in } \mathbb{R}^n, u_{i} > 0 & \text{in } \mathbb{R}^n, \, i = 1, 2,\cdots, L % u_{i}(x) \rightarrow 0 & \text{uniformly as } |x| \rightarrow \infty \end{array} \right. \end{align} for sign changing nonlinearities $f_i$'s. Recently, a degree theory approach to shooting method for this broad class of problems is introduced in \cite{LiarXiv13} for nonnegative $f_i$'s. However, many systems of nonlinear Sch\"odinger type involve interaction with undetermined sign. Here, based on some new dynamic estimates, we are able to extend the degree theory approach to systems with sign-changing source terms.
Asymptotic decomposition for nonlinear damped Klein-Gordon equations
Ze Li,Lifeng Zhao
Mathematics , 2015,
Abstract: In this paper, we proved that if the solution to damped focusing Klein-Gordon equations is global forward in time, then it will decouple into a finite number of equilibrium points with different shifts from the origin. The core ingredient of our proof is the existence of the "concentration-compact attractor" which yields a finite number of profiles. Using damping effect, we can prove all the profiles are equilibrium points.
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