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Search Results: 1 - 10 of 27942 matches for " Yuchao Ma "
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Micro-economic Analysis of the Physical Constrained Markets: Game Theory Application to Competitive Electricity Markets
Ettore Bompard,Yuchao Ma,Elena Ragazzi
Physics , 2005, DOI: 10.1140/epjb/e2006-00122-1
Abstract: Competition has been introduced in the electricity markets with the goal of reducing prices and improving efficiency. The basic idea which stays behind this choice is that, in competitive markets, a greater quantity of the good is exchanged at a lower and a lower price, leading to higher market efficiency. Electricity markets are pretty different from other commodities mainly due to the physical constraints related to the network structure that may impact the market performance. The network structure of the system on which the economic transactions need to be undertaken poses strict physical and operational constraints. Strategic interactions among producers that game the market with the objective of maximizing their producer surplus must be taken into account when modeling competitive electricity markets. The physical constraints, specific of the electricity markets, provide additional opportunity of gaming to the market players. Game theory provides a tool to model such a context. This paper discussed the application of game theory to physical constrained electricity markets with the goal of providing tools for assessing the market performance and pinpointing the critical network constraints that may impact the market efficiency. The basic models of game theory specifically designed to represent the electricity markets will be presented. IEEE30 bus test system of the constrained electricity market will be discussed to show the network impacts on the market performances in presence of strategic bidding behavior of the producers.
Gene knockout strategies for metabolic pathway regulation in industrial microbes
工业微生物代谢途径调控的基因敲除策略

Huimin Yu,Yuchao Ma,
于慧敏
,马玉超

生物工程学报 , 2010,
Abstract: 基因敲除技术是一项重要的分子生物学技术,在工业微生物代谢工程中具有广泛应用。以下从基因敲除技术的遗传重组原理出发,总结了基因敲除策略的类型、特征和应用,重点介绍了采用线性双链DNA的λ Red同源重组系统、使用环状质粒载体介导的单交换或双交换同源重组策略以及采用转座酶介导的转座重组等几种主要的基因敲除方法,进一步展望了基因敲除技术的发展前沿和应用前景。
On the saturation number for cubic surfaces
Yuchao Wang
Mathematics , 2014, DOI: 10.1016/j.jnt.2015.03.014
Abstract: We investigate the density of rational points on the Fermat cubic surface and the Cayley cubic surface whose coordinates have few prime factors. The key tools used are the weighted sieve, the circle method and universal torsors.
The saturation number for Cayley's cubic surface
Yuchao Wang
Mathematics , 2014,
Abstract: We investigate the density of rational points on Cayley's cubic surface whose coordinates have few prime factors. The key tools used are the circle method and universal torsors.
水热耦合作用下沥青-集料界面黏附性研究
Effects of hydro-thermal coupling on adhesion between asphalt and aggregate

崔宇超,马翔,孙孝语
CUI Yuchao
, MA Xiang, SUN Xiaoyu

- , 2018,
Abstract: 为评价环境因素对沥青-集料黏附特性的影响,选用70号基质沥青、SBS改性沥青及高黏沥青共3种沥青与玄武岩、石灰岩2种集料为原材料,通过光电比色法定量检测水热耦合作用对界面黏附性的影响,并通过水煮法和电镜扫描加以验证。研究结果表明:随着水热作用时间的增加,沥青与集料的黏附性逐渐降低;SBS改性沥青和高黏沥青与2种集料均表现出良好的抵抗水热作用的性能,SBS改性沥青只适用于短期水热作用,而高黏沥青具有更好的长期抗水热作用性能;水热作用下,沥青在集料表面的脱落并非全部是层状脱落,而是从集料某些表面特性较差的区域开始逐渐收缩变薄,直到完全将集料表面裸露出来;光电比色法可以定量、可靠地评价沥青与集料之间的黏附性能。
In order to evaluate the effect of environmental factors on the adhesion between asphalt and aggregate, a quantitative determination on the influence of hydro-thermal coupling on the interface adhesion asphalt and aggregate with photoelectric colorimetry is needed. Three types of asphalt and two types of aggregates were used, which were matrix asphalt, SBS modified asphalt, high-viscosity asphalt and basalt, limestone. Water- boiling method and SEM were conducted to verify. It showed that the adhesion would decrease with hydro-thermal effect; SBS modified asphalt and high-viscosity asphalt showed good resistance to hydro-thermal effect with both aggregates. SBS modified asphalt is only applicable to short-term hydro-thermal coupling, and the long-term performance of high viscosity asphalt was better; Under the influence of hydro-thermal coupling, the shedding of asphalt on the surface of aggregate was not all stratiform, but shrink and attenuation from some areas of aggregate where the surface properties were poor, until the aggregate were bared absolutely; Photoelectric colorimetric method was quantitative and reliable for evaluating the adhesion between asphalt and aggregate
Applications and Technology of Electronic Nose for Clinical Diagnosis  [PDF]
Simeng Chen, Yuchao Wang, Seokheun Choi
Open Journal of Applied Biosensor (OJAB) , 2013, DOI: 10.4236/ojab.2013.22005
Abstract: Rapid advances in sensor technologies have facilitated the development of high-performance electronic noses that can detect and discriminate volatile compounds in situ. The research and development of electronic noses has resulted in a new qualitative and semi-quantitative detection approach in the field of clinical diagnostics. Electronic noses have a clear potential to be a non-invasive, simple and rapid but above all accurate early diagnostic screening tool. This review collates existing knowledge of recent advances in electronic nose technologies and applications.
Sludge Bulking Prediction Using Principle Component Regression and Artificial Neural Network
Inchio Lou,Yuchao Zhao
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/237693
Abstract:
Note on some results for asymptotically pseudocontractive mappings and asymptotically nonexpansive mappings
Yuchao Tang,Liwei Liu
Fixed Point Theory and Applications , 2006, DOI: 10.1155/fpta/2006/24978
Abstract: We discuss convergence theorems of modified Ishikawa and Mann iterative sequences with errors for asymptotically pseudocontractive and asymptotically nonexpansive mappings in Banach spaces, and the boundedness of the domain and range can be dropped, generalizing theorems of Chang.
Note on some results for asymptotically pseudocontractive mappings and asymptotically nonexpansive mappings
Tang Yuchao,Liu Liwei
Fixed Point Theory and Applications , 2006,
Abstract: We discuss convergence theorems of modified Ishikawa and Mann iterative sequences with errors for asymptotically pseudocontractive and asymptotically nonexpansive mappings in Banach spaces, and the boundedness of the domain and range can be dropped, generalizing theorems of Chang.
Sludge Bulking Prediction Using Principle Component Regression and Artificial Neural Network
Inchio Lou,Yuchao Zhao
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/237693
Abstract: Sludge bulking is the most common solids settling problem in wastewater treatment plants, which is caused by the excessive growth of filamentous bacteria extending outside the flocs, resulting in decreasing the wastewater treatment efficiency and deteriorating the water quality in the effluent. Previous studies using molecular techniques have been widely used from the microbiological aspects, while the mechanisms have not yet been completely understood to form the deterministic cause-effect relationship. In this study, system identification techniques based on the analysis of the inputs and outputs of the activated sludge system are applied to the data-driven modeling. Principle component regression (PCR) and artificial neural network (ANN) were identified using the data from Chongqing wastewater treatment plant (CQWWTP), including temperature, pH, biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids (SSs), ammonia ( ), total nitrogen (TN), total phosphorus (TP), and mixed liquor suspended solids (MLSSs). The models were subsequently used to predict the sludge volume index (SVI), the indicator of the bulking occurrence. Comparison of the results obtained by both models is also presented. The results showed that ANN has better prediction power ( ) than PCR ( ) and thus provides a useful guide for practical sludge bulking control. 1. Introduction Sludge bulking is the most common solid separation problem in activated sludge problem, which is caused by the excessive growth of filamentous bacteria extending outside the flocs, thus interfering with the settling of activated sludge. It has been reported that over 50% of the wastewater treatments in US experience bulking [1]. Bulking leads to high level of total suspended solids in effluent that exceeds the discharge permit limitation and subsequently loses activated sludge in the aeration basin, resulting in the deterioration of wastewater treatment process [1]. Sludge setting and compaction are often quantified using sludge volume index (SVI). When SVI reaches 150?mL/g, bulking can be considered to happen. Various theories and factors, such as kinetic selection theory [2–4], filamentous backbone theory [5], substrate diffusion limitation [6], storage phenomena [7, 8], and the difference in the decay rates between filaments and floc formers [9], have been proposed and extensively studied for explaining the competition between filaments and floc formers. However, no single or combined proposed mechanisms can explain completely the sludge bulking problem; for example, the uncertainty
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