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Search Results: 1 - 10 of 120578 matches for " Zhijun Wang "
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Research on the Problems and Countermeasures of China's Service Trade in the New Era
Zhijun Sheng,Kuo Wang
International Journal of Financial Research , 2012, DOI: 10.5430/ijfr.v3n4p98
Abstract: Since the 21st century, global trade competitions focus point has shifted from commodity trade to service trade. International trade in services shows some new trends. Although China's service trade has obtained fast development in recent years, they also have many problems. To adapt to the new trend of the development of international service trade, China should take some countermeasures to promote China's service trade has a high level of development. These countermeasures include accelerating to develop the service industry, perfecting the legal system and management system of service trade, strengthening the personnel training work and so on.
Persistence and positive periodic solution of a nonautonomous competitive system
Lianwen Wang,Zhijun Liu
Applied Mathematical Sciences , 2012,
Study on the County-level City in China
Hongxiang Wang,Zhijun Han
Journal of Politics and Law , 2009, DOI: 10.5539/jpl.v2n1p50
Abstract: In this article, we studied the county-level city in China which was the special type in the city development of the world. Through the research about the concept and the origin of the county-level city, we found that the county-level city was different to the current “dot” city in the world, and it was a sort of town system on the “sphere” in the wider area. For China with 0.8 billion farmers, the county-level city for urban and rural certainly possesses special functions in the urbanization and the new countryside construction of China.
A Globally Convergent Parallel SSLE Algorithm for Inequality Constrained Optimization
Zhijun Luo,Lirong Wang
Journal of Mathematics , 2014, DOI: 10.1155/2014/461902
Abstract: A new parallel variable distribution algorithm based on interior point SSLE algorithm is proposed for solving inequality constrained optimization problems under the condition that the constraints are block-separable by the technology of sequential system of linear equation. Each iteration of this algorithm only needs to solve three systems of linear equations with the same coefficient matrix to obtain the descent direction. Furthermore, under certain conditions, the global convergence is achieved. 1. Introduction Consider the following inequality constrained optimization problems: where , are continuously differentiable. We denote To solve the problem (1), there are two type methods with superlinear convergence: sequential quadratic programming (SQP) type algorithms (see [1–4], etc.) and SSLE (sequential system of linear equations) type algorithms (see [5–9], etc.). In general, since SQP algorithms are necessary to solve one or more quadratic programming subproblems in single iteration, the computation effort is very large. SSLE algorithms were proposed to solve the problem (1), in which an iteration similar to the following linear system was considered: where is Lagrangian function, is an estimate of the Hessian of , is the current estimate of a solution , is the search direction, and is the next estimate of the Kuhn-Tucker multiplier vector associated with . Obviously, it is simpler to solve system of linear equations than to solve the QP (quadratic programming) problem with inequality constraints. In addition, parallel variable distribution (PVD) algorithm [10] is a method that distributes the variables among parallel processors. The problem is parted into many respective subproblems and each subproblem is arranged to a different processor in it. Each processor has the primary responsibility for updating its block of variables while allowing the remaining secondary variables to change in a restricted fashion along some easily computable directions. In 2002, Sagastizábal and Solodov [11] proposed two new variants of PVD for the constrained case. Without assuming convexity of constraints, but assuming block-separable structure, they showed that PVD subproblems can be solved inexactly by solving their quadratic programming approximations. Han et al. [12] proposed an asynchronous PVT algorithm for solving large-scale linearly constrained convex minimization problems with the idea in 2009, which is based on the idea that a constrained optimization problem is equivalent to a differentiable unconstrained optimization problem by introducing the Fischer
Innovation of the New Superior Quality Foxtail Millet [Setaria italica (L.) P.Beauv] Variety-Jigu32 with Characteristics of Stress Resistance, Stable and High Yield and Its Physiological Mechanism  [PDF]
Suying Li, Shengjun An, Zhengli Liu, Ruhong Cheng, Zhijun Wang
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.54033

In main foxtail millet growing regions of China, natural disasters happen frequently, causing losses in production and finance. Therefore, it is urgently needed to breed new superior quality foxtail millet varieties with stress resistance, stable and high production, and, so as to stabilize millet production and promote millet industry development. Jigu32, a new foxtail millet variety with stable, high-yield and superior qualities, was developed using Target Character Gene Bank breeding method, and its physiological mechanism was studied as well. Results showed that the prominent characteristics of Jigu32 were as follows: 1) strong stress resistance and stable yielding; 2) high yielding; 3) rich calcium content and superior qualities; 4) excellent comprehensive characteristics. In 2010 National Foxtail Millet Regional Trials, the weather was tough. Severe drought occurred in some experimental stations while in some others, continuous rain, low temperature and little sunlight appeared. However, with the outstanding stress resistance, Jigu32 achieved the highest yields, and the yields were very stable under different conditions. Per unit yield of Jigu32 reached to5133.3 kg/hm

Leptospirosis vaccines
Zhijun Wang, Li Jin, Alicja W?grzyn
Microbial Cell Factories , 2007, DOI: 10.1186/1475-2859-6-39
Abstract: Leptospirosis is a widespread disease [1], caused by infection with the spirochete bacterium Leptospira, which affects almost all mammals [1-13]. Leptospirosis was initially described as Weil's syndrome [8,14]. It is predominantly an occupational disease which affects humans who come into frequently contact with rodents, pets or polluted water [15-18] (Fig. 1). Infection is facilitated with penetrating leptospires through mucosa or an open skin [19]. After gaining entry through the skin, the bacterium causes a serious disease [19]. The symptoms of leptospirosis are extremely broad from meningitis [20], pneumonitis [21,22], hepatitis [23], nephritis [24-27], pancreatitis [28] and erythema nodosum [29] and death [30,31]. Fig. 2 shows the data of human leptospirosis cases reported by Ministry of Health of the People's Republic of China from January 2002 to October 2007 in China mainland. During this time, about 1,500 infected cases and 50 dead were reported. However, many human leptospirosis cases might be misdiagnosed or omitted due to poor medical care and information. Leptospira has over 200 pathogenic serovars, and divides into 25 serogroups, and many different strains with small antigenic differences can be found in some serovars [2,17].Leptospires have evolved ways to escape the immune defense. Pathogenic leptospires are able to translocate through cell monolayers at a rate significantly greater than that of nonpathogenic leptospires [32]. The rapid translocation of pathogenic leptospires between mammalian cells allows the bacteria to quickly reach the bloodstream and disseminate to multiple organs [32]. Virulent leptospires can rapidly enter kidney fibroblasts and induce a programmed cell death [33]. Thus, it is a challenge for immunologists to develop an effective and safe leptospirosis vaccine [34-37]. Currently, molecular and cellular studies on leptospirosis vaccines have been focused on bacterial motility [38,39], lipopolysaccharides (LPSs) [10,40-47], lipo


生态学报 , 1983,
Abstract: The evergreen broadleaf forest of Xujiaba lies on the Ailao Shan Mountains, Yunnan Province where there is an Ecological Research Station of Academia Sinica.As birds' habitat, the forest are divided into the four vertical layers as tree, bamboo, fern and grass. The bamboo jungle Sinarundinaria nitida lies in the middle layer of the forest. The bird dwellers of this layer are described in this paper.Birds are of abundance in species and number in the bamboo jungle, and Alcippe spp. are dominant species among...

Wang Zhijun,

动物学研究 , 1986,
Abstract: These studies on birds were made at northern Ailao Mountain, Yunnan Province. The main census was carried out in the evergreen broadleaf forests of Xujiaba on the ridge of this mountain between 2400-2700 meter elevation. There are many residents that show seasonal vertical migration at Ailao Mountain. The grand dynamic of bird community shows seasonal replace of some dominate species in the evergreen broadleaf forests of Xujiaba. There are more insectivorous birds in summer, the fruit-eaters and the seed-eaters are dominant in winter. Adaptating to the stereoscopic climate of Ailao Mountain for a long period of time, some residents have gradually shaped as habits of vertical migration. Seasonal changes of food and climate rapidly lead a change in the composition of bird community. This vertical migration of birds at the Ailao Mountain shows that we must protect vegetation on the slope of this mountain, except for protect evergreen broadleaf forests of Xujiaba, Such that will be benefit for protect birds.

Wang Zhijun,

动物学研究 , 1991,
Abstract: This study was mostly for Xishuangbanna tropical seasonal rainforests which disturbed by both deforestation and hunting. Some big tree dieback are due to trunk damaged. One apparent result of environmental change is that numbers of species and individuals of dirds are reduced dramatically. Many of these birds arc trunk specialists which can forage pests in trunk, such as woodpeckers could have played a part in controlling trunk damaged. The progresion of come tree dieback is associated with a progressive loss of birds both of species and individuals and trunk pests ramped. Many of big birds are suffering badly from hunting, however, the litte birds that mostly insectivorous are fortunate. A wide range of foliage insects are eaten by these birds, so that Xishuangbanna seasonal rainforests did not happen serious defoliation damage by insects. Levels of herbivory, judged from the proportion of areas of leaves in litterfall eaten by invertebrates was 16.4% which was a high as those in other tropical forests. Birds thus have the potential to influence insect population, and management to overcome tree dieback should provide habitat for birds, do not continually deforest, and we should pay more a attention to protect birds from hunting in Xishuangbanna,
Optimization of Liquid Ammonia Treatment for Enzymatic Hydrolysis of Miscanthus sinensis Anderss  [PDF]
Liping Zhang, Hehuan Peng, Qinling Yu, Ying Zhang, Zhijun Wang, Xianwei Tang
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.37005

Miscanthus biomass yield high, high photosynthetic efficiency, fast growth, easy breeding, widely distributed, is suitable as raw materials for the production of fuel ethanol. In this paper, the method of the pretreatment of liquid ammonia for Miscanthus, using the pretreatment of liquid ammonia to overcome biomass recalcitrance, adding cellulase enzyme, and the monosaccharide content is determined by using high performance liquid chromatography (HPLC). Effect of pretreatment process on the enzyme solution effect of awn, conducts the research to the water processing rate, temperature, residence time, amount of ammonia, the amount of H2O2 parameters. Data shows that, in the moisture content of 80%, temperature 130?C, loading amount of ammonia 2:1, residence time 10 min, the glucan and xylan enzyme conversion rate are 73.23% and 73.28% respectively. After a mass balance, dry base mans per 100 g can get glucose 28.96 g and xylan 17.25 g.

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