OALib Journal期刊

ISSN: 2333-9721




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匹配条件: “JIANG Yu” ,找到相关结果约78240条。
Comparison of the Water Quality between the Surface Microlayer and Subsurface Water in Typical Water Bodies in Sichuan  [PDF]
Jiang Yu
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.210101
Abstract: Investigation and assessment of water quality status in the surface microlayer (SML) and subsurface water (SSW) in several kinds of typical water bodies in Sichuan were carried out from May to June 2010.The results showed that N, P were enriched to some extent at SML in Xichi pool, Funan River and Longquan reservoir, which made concentrations of the indexes such as total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD)of SML be much higher than those of SSW (P<0.05), and the exceeding rates were up to 100%. The contents of TN,TP,COD of SML and SSW in Xichi pool, and Funan River exceeded III even Ⅳlevel of water quality standard, while these indexes in Longquan reservoir were lower than Ⅲ or Ⅱlevel of water quality standard. Though Chl. a mass concentration at SML and SSW in Funan River was prominently lower than those in Xichi pool and Longquan reservoir, according to the eutrophic evaluation standard, the water bodies of SML and SSW in Funan River and Xichi pool were in middle eutrophication, the highest index of eutrophication (E value) was up to 66.78, while there was light entuophic in Longquan reservoir, and there had obvious difference with E value and COD, TP, TN (P<0.05). This research shows that the water quality of Longquan reservoir is generally well. While Funan River is a middle eutrophication, and its pollution is more serious than Xichi pool, the two waters belong to national III even IV level, and SML has the capability of enrichment to the pollutants such as N, P.
Comparative Performance and Computational Approach of Humic Acid Removal by Clay Adsorption  [PDF]
Chao Yu, Jiaqian Jiang
Journal of Environmental Protection (JEP) , 2010, DOI: 10.4236/jep.2010.11004
Abstract: The effective removal of humic acid is an important factor influencing the quality of treated waters. Adsorption is one of major techniques used for the removal of humic acid. This study demonstrated that modified clays could be used as alternatives to activated carbons for adsorbing humic acid. Both Al-Fe modified and Fe modified clays had high affinity to humic acid and then high removal efficiency. Al-modified clay had less removal capacity for adsorbing humic acid. Mathematics formulas were developed to predict the adsorption performance of modified clays for the humic acid removal via the parameters of UV254 absorbance and DOC concentrations. The optimal clay dose could be predicted using the developed model. The F test was used to validate the model developed by examining if it fells into the reject field. The reject field varied according to each F test. The results showed that the model developed was 99% confident and can be used to perform the simulation.
Research on the Fault Location Principle for the Earthing Electrode Line of the UHVDC Transmission System  [PDF]
Xu Peng, Yu Jiang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B227
Abstract: The UHVDC transmission line transports large-capacity power, and its safety operation has very important rule on the safe operation of grid. Currently, in the DC transmission system, the earthing electrode line has the functions of ground potential fixing and bipolar imbalance current circulation during the operation of bipolar balance. Therefore the monitoring to the earthing electrode line operation is very essential. This article firstly introduced the current situation of the research on the earthing electrode line fault location method, then built the relevant PSCAD/EMTDC model for simulation verification of the current using Time Domain Reflectometry for the UHVDC earthing electrode line, and at last analyzed the reasons for the formation of the blind monitoring zones.
Equilibrium Points and Periodic Orbits in the Vicinity of Asteroids with an Application to 216 Kleopatra
Yu Jiang
Physics , 2015, DOI: 10.1007/s11038-015-9464-z
Abstract: In this study, equilibrium points and periodic orbits in the potential field of asteroids are investigated. We present the linearized equations of motion relative to the equilibrium points and characteristic equations. We find that the distribution of characteristic multipliers of periodic orbits around the equilibrium point and the distribution of eigenvalues of the equilibrium point correspond to each other. The distribution of eigenvalues of the equilibrium point confirms the topology and the stability of periodic orbits around the equilibrium point.
A Multi-Agent School Simulation Based on Hierarchical Social Networks  [PDF]
Yu Zhang, Jiang Wu, Lizhu Ma
Intelligent Information Management (IIM) , 2014, DOI: 10.4236/iim.2014.64020

The quality of K-12 education has been a very big concern for years. Previous methods studied only one or two factors, such as school choice, or teacher quality, on school performance. Therefore the results they provide can be limited. We propose a multi-agent approach to integrate multiple actors in a school system. These actors include teachers, students, supporting staffs and administrators. The interactions among these actors compose a hierarchical school social network. We first detect the hierarchical community structure in this school network by using an agglomerative hierarchical algorithm. Existing agglomerative hierarchical algorithms usually calculate similarity or dissimilarity between two clusters by using some measure of distance between pairs of observations. We, however, develop a method that calculates similarity based on social interactions between interactions is essential in multi-agent systems. Our algorithm is applied to 15 school districts in Bexar County, Texas, and it provides satisfying results on generating the hierarchical structure of all school districts. We then use the detected structure of the social network to evaluate the school system’s organization performance. We design and implement a funding evaluation model to decompose the funding policy task into subtasks and then evaluate these subtasks by using funding distribution policies from past years and looking for possible relationships between student performances and funding policies. Experiments in the 15 school districts in Bexar County show no significant correlation between student performance and the amount of the funding a school district received.

A Novel Integrated Circuit Driver for LED Lighting  [PDF]
Yanfeng Jiang, Dong Zhang, Ming Yu
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.57018
Abstract: A novel integrated circuit for driving LED lighting has been proposed, designed and fabricated. Besides the typical parts of LED driver, an integral part was added at the output terminal of error amplifier in the driver. In this way, a novel average current mode can be set up to take the place ordinary peak current control mode. In addition, a BUCK low-level topology was adopted, too. It can be used to drive up to eight 1 W HB LED lights with 350 mA constant current. In this way, the LED driver displays high performance, in which output current with less 1% error and total efficiency as high as 96%. The feasibility of the design has been verified by actual measurement on the fabricated chip.
Antidepressant-Like Effect of Tetramethylpyrazine in Mice and Rats  [PDF]
Lijian Yu, Xiaodan Jiang, Mingneng Liao, Rundi Ma, Tingxi Yu
Neuroscience & Medicine (NM) , 2011, DOI: 10.4236/nm.2011.22020
Abstract: The aim of this study was to investigate the potential antidepressive-like effect of tetramethylpyrazine (TMP), one of available blood-activating and stasis-eliminating components from traditional Chinese medicines, and its mechanism of the antidepressant-like action. Forced-swimming, tail-suspension, reserpine-induced hypothermia, akinesia and ptosis, 5-hydroxytryptophan (5-HTP)-induced head-twitch, and potentiation of noradrenaline (NE) toxicity tests, were per-formed to assess the potential antidepressant-like activity of TMP and to study the mechanism by which TMP exerts the antidepressant-like action. Intragastric (ig) administration of TMP markedly reduced the duration of immobility during forced-swimming tests and tail-supension test in rats and mice. TMP partialy reversed reserpine-induced hypothermia, ptosis and akinesia, and potentiated NE toxicity in mice, and these are similar to those of clomipramine; however, TMP did not potentiate 5-HTP-induced head-twitch response (HTR) in mice, and this is different from that of fluoxetine (FLU). The present data provide evidences that TMP possesses potent antidepressant-like activity, and it might be an adrenergic component of pharmacological activity, and its mechanism of antidepressant-like action is similar to that of clomipramine, and different from that of FLU.
Arabidopsis WRKY2 transcription factor mediates seed germination and postgermination arrest of development by abscisic acid
Wenbo Jiang, Diqiu Yu
BMC Plant Biology , 2009, DOI: 10.1186/1471-2229-9-96
Abstract: To determine directly the role of Arabidopsis WRKY2 transcription factor during ABA-dependent seed germination and postgermination growth arrest, we isolated T-DNA insertion mutants. Two independent T-DNA insertion mutants for WRKY2 were hypersensitive to ABA responses only during seed germination and postgermination early growth. wrky2 mutants displayed delayed or decreased expression of ABI5 and ABI3, but increased or prolonged expression of Em1 and Em6. wrky2 mutants and wild type showed similar levels of expression for miR159 and its target genes MYB33 and MYB101. Analysis of WRKY2 expression level in ABA-insensitive and ABA-deficient mutants abi5-1, abi3-1, aba2-3 and aba3-1 further indicated that ABA-induced WRKY2 accumulation during germination and postgermination early growth requires ABI5, ABI3, ABA2 and ABA3.ABA hypersensitivity of the wrky2 mutants during seed germination and postgermination early seedling establishment is attributable to elevated mRNA levels of ABI5, ABI3 and ABI5-induced Em1 and Em6 in the mutants. WRKY2-mediated ABA responses are independent of miR159 and its target genes MYB33 and MYB101. ABI5, ABI3, ABA2 and ABA3 are important regulators of the transcripts of WRKY2 by ABA treatment. Our results suggest that WRKY2 transcription factor mediates seed germination and postgermination developmental arrest by ABA.Abscisic acid (ABA) is a phytohormone regulating plant responses to a variety of environmental stress, particularly water deprivation, notably by regulating stomatal aperture [1-4]. It also plays an essential role in mediating the initiation and maintenance of seed dormancy [5]. Late in seed maturation, the embryo develops and enters a dormant state that is triggered by an increase in the ABA concentration. This leads to the cessation of cell division and activation of genes encoding seed storage proteins and proteins required to establish desiccation tolerance [6]. Exposure of seeds to ABA during germination leads to rapid but rev
New Physics and Single Top Production
Yu, Jiang-Hao
High Energy Physics - Phenomenology , 2013,
Abstract: We show how single top production in conjunction with a variety of additional final states provides a sensitive probe of new physics. We investigate several new physics scenarios such as lepto-phobic W' model, and exotic B' model, and then perform detailed simulation analyses in s-, and tW-associated production channels.
Dian-yu JIANG
Management Science and Engineering , 2007,
Abstract: In study of traditional economic management game, do not generally consider the interaction between the player's actions and environment. However, for some practical problems such as launch some projects with pollution in a certain area, one have to consider the relation between the player’s interests and the environment. In this paper, we introduce a so-called gross interest-environment game based on binary number and n-person non-cooperative game theory. It is studied that utility function of the game and conditions for Nash equilibria. Key words: economic management science, gross interest-environment game, Nash equilibrium.

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