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Search Results: 1 - 10 of 18678 matches for " Mingxiu Gao "
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Characteristics and Spatial Variability of Saline-Alkaline Soil Degradation in the Typical Yellow River Delta Area of Kenli County, China  [PDF]
Zhuoran Wang, Gengxing Zhao, Mingxiu Gao, Chunyan Chang, Jichao Jia, Jin Li
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.512104
Abstract: As an important area of reserve land resources, the Yellow River Delta is faced with the problem of soil salinization. Grasping the characteristics of soil salinity as well as its spatial variation patterns is an important foundation of prevention, control and utilization of saline soil. This study selected Kenli County of the Yellow River Delta, obtained soil salinity data through field survey and lab experiment, and used statistical, GIS interpolation and buffer analysis methods to analyze the characteristics of soil salinity and its spatial variation patterns. Our results showed that the general soil salinity in the study area was mainly moderate and there was a significant positive correlation between different soil layers of 0 - 15 cm, 15 - 30 cm and 30 - 45 cm and soil salinity increased with the increase of soil depth. The areas with high soil salinity in each soil layer mainly distributed in the east near the Bo Sea in the county, while the areas with lower soil salinity mainly distributed in the southwest, centre and the two sides of the Yellow River in the northeast. Soil salinity showed a trend of decrease with the increase in distance to the Bo Sea, while stretching from the Yellow River, it showed increase tendency with the increase in distance to the Yellow River. The order from high soil salinity to low of different vegetation types was naked land → suaeda glauca → tamarix → vervain → reed → couch grass → paddy → cotton → winter wheat → maize; the order for different geomorphic types was depression → slightly sloping ground → slow hillock → high flood land. This study preliminary delineated the characteristics of soil salinity as well as its spatial variation patterns in the study area, and provided scientific basis for soil resource sustainable utilization in the Yellow River Delta.
31P solid-state NMR spectroscopy of VPO catalysts
Mingxiu Li,Shutao Yang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882869
Annealing Embrittlement in Fe-Mo-Si-B Amorphous Alloy
Jianmin LI,Mingxiu QUAN,Zhuangqi HU,

材料科学技术学报 , 1997,
Abstract: Annealing at Ta=200℃ or so, the enhancement in the average tensile fracture strength of as-quenched (Fe0.99Mo0.01)78Si9B13 metallic glass increases about 7~8%. The origin of the annealing embrittlement at 244℃ in the metallic glass (Fe0.99 Mo0.01)78Si9B13 was revealed that due to the formation of nanoscale granular with bcc structure resulting in the stress localization.The temperature of annealing embrittlement was in agreement with the calculated value from Tbcc=0.637Tc (Tc is the crystallized temperature), based on micromechanism of crystallization of metallic glass.
Micromechanism of Crystallization in Multicomponent Metallic Glass
Jianmin LP,Mingxiu,QUAN,Zbuangqi HU,

材料科学技术学报 , 1996,
Abstract: A micromechanism in an atomic level of crystallization of transition metal-metalloid TM80M20 metallic glass is thermodynamically proposed by taking Bernal polyhedra as the starting structure of metaIlic glass. It is composed of two competitively processes: (i) densification process of atom cluster leads to the formation of the precursor in amorphous matrix, (ii) the growth of atom cluster leads to the decreasing packing density. The preferential precipitation sequence of metastable phase is bcc, bct. cpc (close-packed crystal, hcp or fcc structure). A metastable phase decomposition (Fe,Mo)23B6 (fcc)-Fe2B highly strained bct phase was observed during crystallization of (Fe0.99Mo0.01)78Si9B13 metallic glass, which is related to the occurrence of nanocrystalline.

Xin Mingxiu,Zhou Peijin,

微生物学报 , 2000,
Abstract: 冷适应微生物 (Coldadaptedmicroorganism)包括嗜冷菌和耐冷菌。嗜冷菌可在 0℃生长 ,其最适和最高生长温度分别低于 1 5℃和 2 0℃。耐冷菌可在 0℃~ 5℃生长繁殖 ,其最适和最高生长温度分别低于2 0℃和 35℃。冷适应微生物通过产生冷活性酶 (Cold activeenzyme)来调节它们的代谢活动并以此来适应低温环境。依Feller( 1 996)提出的定义 ,冷活性酶具有如下特征 :1 酶活性曲线作为温度的函数趋向于低温 ;2 在低温范围内 ( <40℃ )酶的转换数 (kcat)或生理系数 (kcat/Km)高于来自…

Xin Mingxiu,Jiang Yaping,

微生物学通报 , 1994,
Abstract: 采用混合酶液处理纤维素酶高产苗株3042N-2(天冬酰胺缺陷型“Asn-”)及蛋白酶高产菌株3042N-19(蛋氨酸缺陷型“Met-”)的营养菌丝,获得原生质体,以PEG为助融剂进行融合处理,成功地获得了米曲霉(Aspergillusoryzae)原生质体的营养互补融合。将异核体菌落的菌丝转接到合有0.1%樟脑的新鲜MM上,25℃诱导培养7─15天,挑取绿色角变菌落的孢子,将其转接到MM上能迅速生长,经孢
Gronwall-type integral inequalities with impulses on time scales
Peng Y,Kang Ying,Yuan Mingxiu,Huang Rongfeng
Advances in Difference Equations , 2011,
Abstract: In this article, some Gronwall-type integral inequalities with impulses on time scales are investigated. Our results extend some known dynamic inequalities on time scales, unify and extend some continuous inequalities and their corresponding discrete analogues. Some applications of the main results are given in the end of this article. AMS (MOS) Subject Classification 34D09; 34D99, 37M10, 35D05, 49K25, 90C46.
Detection of treatment effects by covariate-adjusted expected shortfall
Xuming He,Ya-Hui Hsu,Mingxiu Hu
Statistics , 2011, DOI: 10.1214/10-AOAS347
Abstract: The statistical tests that are commonly used for detecting mean or median treatment effects suffer from low power when the two distribution functions differ only in the upper (or lower) tail, as in the assessment of the Total Sharp Score (TSS) under different treatments for rheumatoid arthritis. In this article, we propose a more powerful test that detects treatment effects through the expected shortfalls. We show how the expected shortfall can be adjusted for covariates, and demonstrate that the proposed test can achieve a substantial sample size reduction over the conventional tests on the mean effects.
Effect of Microstructure on Electrorheological Property for Pure TiO2 Particle Material
Yanli SHANG,Shuzhen MA,Junran LI,Mingxiu LI,Juan WANG,Shaohua ZHANG,

材料科学技术学报 , 2006,
Abstract: Pure titanium dioxide (TiO2) particle materials were prepared by hydrolyzing titanium tetrachloride (TiCl4).The microstructures of these materials were determined by X-ray diffraction (XRD), accelerated surface area and porosimetry apparatus (BET), and transmission electron microscopy (TEM). The TiO2 materials obtained by calcinations under different temperatures distinctly revealed different microstructures in crystal structure type, surface area, pore size, pore volume and grain size. The relationship between the microstructure of the TiO2 materials and their electrorheological (ER) activity was investigated. Anatase titania particles have better ER performance than rutile titania particles. Amorphous TiO2 materials display higher ER activity than the crystalline titania materials. A large pore volume can be more advantageous in improving the ER effect of a particle material.
晶态 Ni 粉与非晶 Fe_(78)Si_(12)B_(10)球磨时的固态反应

WANG Kaiyan QUAN Mingxiu WANG Jingtang,

材料研究学报 , 1993,
Abstract: Solid state reaction between crystalline Ni and amorphous Fe_(78)Si_(12)B_(10) powdersduring mechanical milling is investigated in this paper.For the powder mixtures with contentsof 17at.-% and 30at.-% Ni,the reaction results in the formation of new amorp
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