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Search Results: 1 - 10 of 23852 matches for " Xuejun Zheng "
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Study on the Production Technology, Elasticities and Market Structure Impact on Profit Formation  [PDF]
Jian Wang, Xuejun Zheng
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.36094
Abstract: The size of the profit in a firm or a production system not only depends on the quantity of inputs and outputs, but also depends on the market structure that means the market is perfect competition or imperfect competition. In general, the relationship between output and inputs can be defined as the production structure, which is usually decided by production technology. Therefore, under the market economy system, the production structure regulation has to follow the market structure variation. Here we assume that production technology is a C-D function, and then to determine the effects of different market structures, which we find, they are in close contacted with both production and market structures, especially some variations of elasticities. Through out a series of deduction and equilibrium analysis, the restricted conditions of the maximum profit have been found. Therefore, the consequences show that the values of elasticities have taken an important role in profit obtained for producer, the profits in a perfect competition market hardly depends on market demand elasticity, in which production elasticity requires rather small. However, in the imperfect competition market, monopoly make both price of demand and production elasticities impact on the profit. Those also prove that market monopoly factors make production lose efficiency, or lead to the market failure. In the actual process of production and management, production elasticities and related market information should be strengthened for measurement, which will be useful for analysis price fluctuation risk and management decision.
Dependence of crystalline, ferroelectric and fracture toughness on annealing in Pb(Zr0.52Ti0.48)O3 thin films deposited by metal organic decomposition
Zheng, Xuejun;Zhou, Yichun;Yan, Zhi;
Materials Research , 2003, DOI: 10.1590/S1516-14392003000400022
Abstract: crystalline, electric and fracture properties of pb(zr0.52ti0.48)o3 (pzt) thin films are strongly affected by annealing temperatures in rapid treatment annealing (rta) of metal organic decomposition (mod). x-ray diffraction (xrd), rt66a standard ferroelectric analyzer and vickers indentation method were used to investigate the crystalline, ferroelectric and mechanical properties, respectively. pzt thin film with complete perovskite structure and best ferroelectric property can be obtained at 750 °c, however the fracture toughness was weaker than the thin films annealed at 600 °c and 650 °c. with the increase of annealing temperature from 600 °c to 750 °c, the remanent polarization and coercive field increased in the ranges 13.8~25.2 (μc/cm2) and 7.2~8.3 (kv/cm) respectively, while the fracture toughness of pzt thin films decreased from 0.49 mpam1/2 to 0.47 mpam1/2.
Dependence of crystalline, ferroelectric and fracture toughness on annealing in Pb(Zr0.52Ti0.48)O3 thin films deposited by metal organic decomposition
Zheng Xuejun,Zhou Yichun,Yan Zhi
Materials Research , 2003,
Abstract: Crystalline, electric and fracture properties of Pb(Zr0.52Ti0.48)O3 (PZT) thin films are strongly affected by annealing temperatures in rapid treatment annealing (RTA) of metal organic decomposition (MOD). X-ray diffraction (XRD), RT66A standard ferroelectric analyzer and Vickers indentation method were used to investigate the crystalline, ferroelectric and mechanical properties, respectively. PZT thin film with complete perovskite structure and best ferroelectric property can be obtained at 750 °C, however the fracture toughness was weaker than the thin films annealed at 600 °C and 650 °C. With the increase of annealing temperature from 600 °C to 750 °C, the remanent polarization and coercive field increased in the ranges 13.8~25.2 (μC/cm2) and 7.2~8.3 (kV/cm) respectively, while the fracture toughness of PZT thin films decreased from 0.49 MPam to 0.47 MPam .
L-Topological Spaces Based on Residuated Lattices  [PDF]
Zhudeng Wang, Xuejun Liu
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.21010
Abstract: In this paper, we introduce the notion of L-topological spaces based on a complete bounded integral residuated lattice and discuss some properties of interior and left (right) closure operators.
New Application, Development and Aerospace Prospect of fNIR  [PDF]
Jinjin Pan, Xuejun Jiao
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.55B010
Abstract: Functional near-infrared imaging (fNIR) is a non-invasive, convenient, safe and stable imaging method to test biological state. It can obtain the biological tissue hemodynamic data, thus becoming a powerful tool to measure brain activities, mental workload, metabolism and cognitive activities state. First of all, we introduced the characteristics and current situation of fNIR in this article. Then we focused on the applications of fNIR, discussed some existing problems and future directions, including the prospect in aerospace field. Our purpose is to give a comprehensive description of fNIR and show its potential in aerospace field.
Why They Connected: A Theoretical Analysis on the Cause of Interfirm Network Formation  [PDF]
Zhengqun Zhan, Xuejun Deng
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29039
Abstract:

Empirical studies have demonstrated that the motivations which lead a firm to construct networks are diversified, and are usually a synthetic result from different type motivations. We found that firms construct their networks for many different reasons, including economic factors (reducing costs, obtaining scarce resources, improving market competitiveness, etc.), and social factors (as when a new or small-scaled firm joins a well-established network to improve their image and acquire social recognition or legitimacy).The construction of an interfirm network is driven firstly by resource reliance. Secondly, economic benefits and improvement in market position brought about by such networks have driven many firms to construct interfirm networks. Finally, the social restraints arise mainly from the pressures imposed by social norms.

Temperature Effect on the Microstructures and Optical Properties of ZnO Nanowires
Yanglong Chen,Xianying Wang,Shufan Xie,Jian Liu,Hongbin Cheng,Xuejun Zheng,Fang Liu,Junhe Yang
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/172312
Abstract: Temperature effects on the microstructures and optical properties of ZnO nanowires were investigated extensively. Furnace calibration results showed that temperatures inside the tube furnace had Gaussian distribution. Both radial and axial growth rates of ZnO nanowires in the Arrhenius plot fall on straight lines. With the increase of temperatures, ZnO nanowires exhibited larger diameters, better crystal qualities, and preferred growth along 〈0002〉 directions. Enhanced UV emission with the increase of growth temperatures was observed, while green emission was greatly reduced.
Anti-inflammation effects of hydrogen saline in LPS activated macrophages and carrageenan induced paw oedema
Zheng Xu, Jiangrui Zhou, Jianmei Cai, Zhen Zhu, Xuejun Sun, Chunlei Jiang
Journal of Inflammation , 2012, DOI: 10.1186/1476-9255-9-2
Abstract: Carrageenan-induced paw oedema and LPS-activated macrophages are studied in this article. Injection of carrageenan into the foot of a mouse elicited an acute inflammatory response characterized by increase of foot volume and infiltration of neutrophils. While tumor necrosis factorα(TNF-α) secreted by activated macrophages was determined by ELISA and real-time PCR.All parameters of inflammation (foot volume, infiltration of neutrophils, amount of TNF-α and the level of TNF-α's mRNA) were attenuated by the hydrogen saline treatment.As a more convenient way than inhaling H2, hydrogen saline exhibits a protective effect against inflammation and it might provide a novel therapeutic approach for inflammatory diseases.Oxidative stress is thought to play an important role in the pathogenesis of inflammation not only through direct injurious effects, but also by involvement in molecular mechanisms [1]. Among the complicated factors involved in the process of inflammation, reactive oxygen species (ROS) and reactive nitrogen species (RNS), such as the hydroxyl radical (?OH), superoxide anion (O2-), hydrogen dioxide (H2O2), nitric oxide (NO) and peroxynitrite (ONOO-), appear to be critical elements. There is a large amount of evidence showing that the production of reactive species such as O2?-, H2O2, and ?OH occurs at the site of inflammation and contributes to tissue damage [2,3]. By using inhibitors of NOS, the severity of inflammation was reduced, which demonstrates the role of NO? in the pathogenesis associated with various models of inflammation [4-6]. In addition to NO?, ONOO- is also generated during inflammation damage [3,6]. The involvement of ONOO- in these conditions is strongly manifested by direct measurements. There is immunocytochemical documentation (increased nitrotyrosine immunoreactivity in the inflamed tissues) of augmented ONOO- production in many inflammation diseases, such as ileitis [7], endotoxin-induced intestinal inflammation [8] and arthritis[9]. Fu
Laser mass spectrometry for high sensitive and multi-com- ponent analysis of exhaust gas from vehicles
Liandi Zhang,Jie Wei,Haiyang Zheng,Ziyao Li,Zhuhong Xia,Xuejun Gu,Bin Zhang
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183218
Abstract: Laser mass spectrometry is a newly developed method for pollutant detection. It combines resonance-enhanced multiphoton ionization (REMPI) and time-of-flight mass spectrometry (TOF-MS). It may detect pollutants with high sensitivity, high selectivity and in a multi-component way. In this note, laser mass spectrometry was used to detect the pollutants in exhaust gases from vehicles. With one-color REMPI (at 266 nm), several aromatic hydrocarbons, including benzene, toluene, xylene, C3-benzene, etc., were detected. These substances were selectively ionized by (1+1) REMPI and their mass resolution was detected by a TOE mass spectrometer. And a quantitative analysis was achieved.
Laser mass spectrometry for high sensitive and multi-com- ponent analysis of exhaust gas from vehicles

Liandi Zhang,Jie Wei,Haiyang Zheng,Ziyao Li,Zhuhong Xia,Xuejun Gu,Bin Zhang,

科学通报(英文版) , 2001,
Abstract: Laser mass spectrometry is a newly developed method for pollutant detection. It combines resonance-en- hanced multiphoton ionization (REMPI) and time-of-flight mass spectro- metry (TOF-MS). It may detect pollutants with high sensitivity, high selectivity and in a multi-com- ponent way. In this note, laser mass spectrometry was used to detect the pollutants in exhaust gases from vehicles. With one-color REMPI (at 266 nm), several aromatic hydrocarbons, including benzene, toluene, xylene, C3-benzene, etc., were detected. These substances were selectively ionized by (1+1) REMPI and their mass resolution was detected by a TOF mass spectrometer. And a quantitative analysis was achieved.
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