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Search Results: 1 - 10 of 28638 matches for " Ran Dong / Дун Жань "
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Evaluation on Input-output Efficiency of Land Consolidation Project Based on DEA --- A Case Study of Land Consolidation Project in Chongyang County, Hubei Province
Zhijie Dong,Ruiping Ran
Asian Social Science , 2012, DOI: 10.5539/ass.v8n2p72
Abstract: This article studies four land consolidation projects in four towns of Chongyang County, Hubei Province, establishes system indexes for evaluation on input and output of land consolidation projects in all the four towns and employs DEA method to make an analysis of the relative efficiency of the projects in order to make an analysis of the actual efficiency of land consolidation, decide whether land consolidation is highly effective and point out a direction of improvement for higher land consolidation efficiency in the future. The result shows that the land consolidation in Qingshan Town and Lukou Town is ineffective and the land consolidation in Shaping Town and Baini Town is effective, with an average efficiency of 0.77. It proves that the overall efficiency of land consolidation in the four towns is at an upper-and-middle stream. Inefficiency is mainly manifested in cost of construction of a project, original equipment cost, other costs and redundancy of unpredictable costs, while increment of land use ratio, quantity of employment added per unit investment, rate of coverage of newly added green vegetation, newly added annual pure economic interests and yield rate of static investment have too low output. In order to enhance the efficiency of land consolidation, it is necessary to arrange all sorts of input in a reasonable way and pay enough attention to the output.
Formation of precise 2D Au particle arrays via thermally induced dewetting on pre-patterned substrates
Dong Wang,Ran Ji,Peter Schaaf
Beilstein Journal of Nanotechnology , 2011, DOI: 10.3762/bjnano.2.37
Abstract: The fabrication of precise 2D Au nanoparticle arrays over a large area is presented. The technique was based on pre-patterning of the substrate before the deposition of a thin Au film, and the creation of periodic particle arrays by subsequent dewetting induced by annealing. Two types of pre-patterned substrates were used: The first comprised an array of pyramidal pits and the second an array of circular holes. For the dewetting of Au films on the pyramidal pit substrate, the structural curvature-driven diffusion cooperates with capillarity-driven diffusion, resulting in the formation of precise 2D particle arrays for films within a structure dependent thickness-window. For the dewetting of Au films on the circular hole substrate, the periodic discontinuities in the films, induced by the deposition, can limit the diffusion paths and lead to the formation of one particle per individual separated region (holes or mesas between holes), and thus, result in the evolution of precise 2D particle arrays. The influence of the pre-patterned structures and the film thickness is analyzed and discussed. For both types of pre-patterned substrate, the Au film thickness had to be adjusted in a certain thickness-window in order to achieve the precise 2D particle arrays.
Wedding ritual in the modern Chinese and Russian urban cultures: communicative and linguistic conceptological analysis / Свадебный ритуал в современной китайской и русской городской культуре
Ran Dong / Дун Жань,Slyshkin G.G. / Слышкин Геннадий Геннадьевич
Sociologia Goroda , 2008,
Abstract: The article opens a series of publiсations devoted to the comparative linguistic and cultural analysis of basic rituals of the modern Russian and Chinese urban cultures. The data presented in the articles results from the research carried out by a group of Chinese postgraduates under the guidance of professor G.G. Slyshkin. In the first article the ritual of wedding is viewed as a communicative custom and a linguistic cultural concept. / Статья открывает цикл публикаций, посвященных сравнительному лингвокультурологическому анализу основных ритуалов современной городской культуры России и Китая. Работы являются итогом исследований, выполненных группой китайских аспирантов под руководством проф. Г.Г. Слышкина. Рассмотрен свадебный ритуал как коммуникативная практика и как лингвокультурный концепт.
Scalable hierarchical parallel algorithm for the solution of super large-scale sparse linear equations
Ran Xu,Bin Liu,Yuan Dong
Physics , 2012, DOI: 10.1115/1.4023481
Abstract: The parallel linear equations solver capable of effectively using 1000+ processors becomes the bottleneck of large-scale implicit engineering simulations. In this paper, we present a new hierarchical parallel master-slave-structural iterative algorithm for the solution of super large-scale sparse linear equations in distributed memory computer cluster. Through alternatively performing global equilibrium computation and local relaxation, our proposed algorithm will reach the specific accuracy requirement in a few of iterative steps. Moreover, each set/slave-processor majorly communicate with its nearest neighbors, and the transferring data between sets/slave-processors and master is always far below the set-neighbor communication. The corresponding algorithm for implicit finite element analysis has been implemented based on MPI library, and a super large 2-dimension square system of triangle-lattice truss structure under random static loads is simulated with over one billion degrees of freedom and up to 2001 processors on "Exploration 100" cluster in Tsinghua University. The numerical experiments demonstrate that this algorithm has excellent parallel efficiency and high scalability, and it may have broad application in other implicit simulations.
Ordered arrays of nanoporous silicon nanopillars and silicon nanopillars with nanoporous shells
Dong Wang, Ran Ji, Song Du, Arne Albrecht and Peter Schaaf
Nanoscale Research Letters , 2013, DOI: 10.1186/1556-276X-8-42
Abstract: The fabrication of ordered arrays of nanoporous Si nanopillars with and without nanoporous base and ordered arrays of Si nanopillars with nanoporous shells are presented. The fabrication route is using a combination of substrate conformal imprint lithography and metal-assisted chemical etching. The metal-assisted chemical etching is performed in solutions with different [HF]/[H2O2 + HF] ratios. Both pore formation and polishing (marked by the vertical etching of the nanopillars) are observed in highly doped and lightly doped Si during metal-assisted chemical etching. Pore formation is more active in the highly doped Si, while the transition from polishing to pore formation is more obvious in the lightly doped Si. The etching rate is clearly higher in the highly doped Si. Oxidation occurs on the sidewalls of the pillars by etching in solutions with small [HF]/[H2O2 + HF] ratios, leading to thinning, bending, and bonding of pillars.
Ordered arrays of nanoporous gold nanoparticles
Dong Wang,Ran Ji,Arne Albrecht,Peter Schaaf
Beilstein Journal of Nanotechnology , 2012, DOI: 10.3762/bjnano.3.74
Abstract: A combination of a “top-down” approach (substrate-conformal imprint lithography) and two “bottom-up” approaches (dewetting and dealloying) enables fabrication of perfectly ordered 2-dimensional arrays of nanoporous gold nanoparticles. The dewetting of Au/Ag bilayers on the periodically prepatterned substrates leads to the interdiffusion of Au and Ag and the formation of an array of Au–Ag alloy nanoparticles. The array of alloy nanoparticles is transformed into an array of nanoporous gold nanoparticles by a following dealloying step. Large areas of this new type of material arrangement can be realized with this technique. In addition, this technique allows for the control of particle size, particle spacing, and ligament size (or pore size) by varying the period of the structure, total metal layer thickness, and the thickness ratio of the as-deposited bilayers.
Earthquake-triggered landslides in southwest China
X. L. Chen,Q. Zhou,H. Ran,R. Dong
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2012, DOI: 10.5194/nhess-12-351-2012
Abstract: Southwest China is located in the southeastern margin of the Tibetan Plateau and it is a region of high seismic activity. Historically, strong earthquakes that occurred here usually generated lots of landslides and brought destructive damages. This paper introduces several earthquake-triggered landslide events in this region and describes their characteristics. Also, the historical data of earthquakes with a magnitude of 7.0 or greater, having occurred in this region, is collected and the relationship between the affected area of landslides and earthquake magnitude is analysed. Based on the study, it can be concluded that strong earthquakes, steep topography as well as fragile geological environment, are the main reasons responsible for serious landslides in southwest China. At the same time, it is found that the relationship between the area affected by landslides and the earthquake magnitude in this region are consistent with what has been obtained worldwide. Moreover, in this paper, it is seen that the size of the areas affected by landslides change enormously even under the same earthquake magnitude in the study region. While at the same tectonic place or fault belt, areas affected by landslides presented similar outline and size. This means that local geological conditions and historical earthquake background have an important influence on landslides distribution, and they should be considered when assessing earthquake-triggered landslide hazards at Grade 1 according to ISSMGE.
Hyperinsulinemic hypoglycemia due to diffuse nesidioblastosis in adults: A case report
Ran Hong, Dong-Youl Choi, Sung-Chul Lim
World Journal of Gastroenterology , 2008,
Abstract: Persistent hyperinsulinemic hypoglycemia is caused most commonly by an insulinoma in adults or by nesidioblastosis in neonates. In adults, nesidioblastosis is a rare disorder characterized by diffuse or disseminated proliferation of islet cells. We recently encountered a case of nesidioblastosis in an adult. A 71-year-old man was admitted due to intermittent general weakness, abdominal pain, and mild dyspnea. The patient underwent a subtotal gastrectomy for a gastric adenocarcinoma two years ago. After 5 d of admission, the patient showed symptoms of cold sweating, chilling, and hypotension 30 min after eating. Thereafter, he frequently showed similar symptoms accounting for hypoglycemia regardless of food consumption. Laboratory findings revealed a low fasting blood glucose level (25 mg/dL), and a high insulin level (47 μIU/mL). Selective intra-arterial calcium stimulation with hepatic venous sampling (ASVS) was performed to localize a mass and revealed an increased insulin level about four-fold that of the normal fasting level at 60 s in the splenic artery, which suggested the presence of an insulinoma in the tail of pancreas. A distal pancreatectomy was performed. Neither intraoperative exploration nor a frozen biopsy specimen detected any mass-forming lesion. On the histological examination, many of the islets were enlarged and irregularly shaped in all specimens, the arrangement of which was a lobulated islet pattern. Cytologically, a considerable subpopulation of endocrine cells showed enlarged and hyperchromatic nuclei. By immunohistochemistry, the cells were identified as β-cells. These clinical, radiological, microscopic and immuno-histochemical findings are consistent with diffuse nesidioblastosis in adults.
Early Growth Response Protein 1 Promotes Restenosis by Upregulating Intercellular Adhesion Molecule-1 in Vein Graft
Kui Zhang,Jian Cao,Ran Dong,Jie Du
Oxidative Medicine and Cellular Longevity , 2013, DOI: 10.1155/2013/432409
Abstract: Objectives. To verify the relationship between Egr-1 and vein graft restenosis and investigate the related mechanisms. Methods. Mouse vein graft models were established in Egr-1 knockout (KO) and wild-type (WT) mice. The vein grafts in the mice were taken for pathological examination and immunohistochemical analysis. The endothelial cells (ECs) were stimulated by using a computer-controlled cyclic stress unit. BrdU staining and PCR were used to detect ECs proliferation activity and Egr-1 and ICAM-1 mRNA expression, respectively. Western-blot analysis was also used to detect expression of Egr-1 and intercellular adhesion molecule-1 (ICAM-1) proteins. Results. The lumens of vein grafts in Egr-1 KO mice were wider than in WT mice. ECs proliferation after mechanical stretch stimulation was suppressed by Egr-1 knockout ( ). Both in vein grafts and ECs from WT mice after mechanical stretch stimulation, mRNA expression and protein of Egr-1 and ICAM-1 showed increases ( ). However, ICAM-1 expression was significantly suppressed in ECs from Egr-1 knockout mice ( ). Conclusions. Egr-1 may promote ECs proliferation and result in vein graft restenosis by upregulating the expression of ICAM-1. As a key factor of vein graft restenosis, it could be a target for the prevention of restenosis after CABG surgery. 1. Introduction Coronary artery bypass graft (CABG) is one of the most effective therapies for coronary artery diseases (CAD). However, some studies revealed that about 10% of vein grafts occluded within one month after CABG and that only 50% of vein grafts remained unobstructed 10 years after CABG [1]. Thus, how to improve the efficiency of vein grafts over time is a challenge in cardiac surgery. Some of the mechanisms involved in the occlusion of vein grafts have been identified. Normal vascular endothelial cells (ECs) play a central role in regulating intimal growth [2, 3]. After CABG, vein grafts walls sustain a blood pressure that is much higher than the usual venous pressure, and the walls of the vein graft are often injured by pulsatile stretching [4–6]. These stresses lead to endothelial dysfunction, which is the initial factor inducing the proliferative thickening of the intima [7]. These injuries induce changes in ECs proliferation, cytokines secretion, platelet aggregation, and leukocyte adherence, which are involved in the onset of acute thrombosis [7, 8]. This impairment in the function of ECs then activates vascular smooth muscle cells (VSMCs) migration to the intima, where they transform into a proliferative phenotype. Synthesis and accumulation of
Effects of pH and particle size on kinetics of nitrobenzene reduction by zero-valent iron
Simultaneous elution of polycyclic aromatic hydrocarbons and heavy metals from contaminated soil by two amino acids derived from β-cyclodextrins

Jun Dong,Yongsheng Zhao,Ran Zhao,Rui Zhou,
Jun Dong
,Yongsheng Zhao,Ran Zhao,Rui Zhou

环境科学学报(英文版) , 2010,
Abstract: Nitrobenzene has been considered as a significant groundwater contaminant due to its wide usage in explosives, insecticides, herbicides, pharmaceuticals and dyes. Nitrobenzene is of environmental concern because of its toxicity. In the presence of zero-valent iron (ZVI), reduction of the nitro group is the dominant transformation process for nitrobenzene. A series of experiments were carried out to investigate the kinetics of nitrobenzene reduction by ZVI and the effects of pH and ZVI particle size on nitrobenzene removal in groundwater. The results indicated that nitrobenzene could be reduced to aniline by ZVI; the reduction of nitrobenzene by ZVI followed a pseudo first-order kinetics; the observed nitrobenzene reduction rate constant (kobs) was 0.0006 min?1 and the half-life of nitrobenzene (t1/2) was 115.5 min; the mass balance achieved 87.5% for nitrobenzene reduction by the 1 mm ZVI particle and the final removal efficiency was 80.98%. In addition, the pH and ZVI particle size were found to exhibit significant influences on the nitrobenzene reduction. The observed nitrobenzene reduction rate constant linearly decreased with increase pH and the data fitted on polynomial regression equation for the observed nitrobenzene reduction rate constant and ZVI particle size. Therefore, use of ZVI based permeable reactive barrier technology to remedy nitrobenzene contaminated groundwater was feasible.
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