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Search Results: 1 - 10 of 12682 matches for " YAO Weiqin "
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Survey and study on the Science students' learning psychology and behaviour in senior middle schools
ZHAN Weiqin
Asia-Pacific Forum on Science Learning and Teaching , 2004,
Abstract: Since curriculum reform in senior middle school has started from the last September, the goal of teaching and the style of learning have undergone a tremendous change. Using questionnaire survey, we investigate in senior middle schools whether the science students' psychology of learning, consciousness and behaviour are well adapted to the curriculum reform and, whether there are any difficulties. We also try to find out the merits and defects of the form and assessment about traditional teaching, and put forward a proposal of teaching reform.
Hierarchical Resource Load Balancing Based on Multi-Agent in ServiceBSP Model  [PDF]
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.31008
Abstract: Based on ServiceBSP model, a hierarchical resource load balancing algorithm with Multi-Agent is put forward in this paper which achieves the goal of dynamic load balancing and favorable Fault-tolerant. The algorithm calculates the load value according to the attributes of resource and scheduling tasks relies on the load value, while updating the load information dynamically depending on Multi-Agent. The method avoids frequent communications on load information. Furthermore, the paper introduces the function of agents, relations and communications among agents in details. Finally, by comparing response time and distribution of load using proposed method with other available methods such as without no load balancing and load balancing only giving regards to CPU, the experimental simulation shows that the load balancing based on Multi-Agent possesses superior performance on response time and load balancing.
Insulation State On-line Monitoring and Running Management of Large Generator  [PDF]
Qiudong Sun, Zhengxin Zhou, Weiqin Guo
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.23030
Abstract: This study presented an insulation state monitoring method for large generator based on radio frequency (RF) technique. As an on-line condition monitor and the precondition of condition-based maintenance (CBM), the RF monitor used the high frequency current mutual inductor to detect the partial discharge signal from neutral wire of stator windings. According to the magnitude of indicative value of RF monitor, a five phase model was also proposed to manage the generator’s running better. The practices show that the proposed method is effective.
Mental Obstacle Analysis about Studying Physics in Senior Secondary School
ZHAN Weiqin,YU Jing
Asia-Pacific Forum on Science Learning and Teaching , 2001,
Abstract: When students come from junior into senior secondary school, they often setback in studying physics. Through analysis of the knowledge configuration, there is a large span in its subject depth, difficulty and subject breadth on transition from junior to senior forms. It is known that the students' learning ability not only lies on their intelligence but also is affected by their non-intelligence complication. For studying physics in senior secondary school, it is evident that there is a high demand in their abstract thinking, logic deduction and mathematical skills for knowledge analysis and problem-solving. If the students cannot acclimatize themselves to this change, mental obstacle in physics studying is to come forth. Through the research by a questionnaire survey, it is found that there are several kinds of mental obstacle existing in the first year of senior secondary school students' physics studying.
Optimal Investment Problem with Multiple Risky Assets under the Constant Elasticity of Variance (CEV) Model  [PDF]
Hui Zhao, Ximin Rong, Weiqin Ma, Bo Gao
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.36092
Abstract: This paper studies the optimal investment problem for utility maximization with multiple risky assets under the constant elasticity of variance (CEV) model. By applying stochastic optimal control approach and variable change technique, we derive explicit optimal strategy for an investor with logarithmic utility function. Finally, we analyze the properties of the optimal strategy and present a numerical example.
RNA Interference Mediated Silencing of Tissue Factor in Human Umbilical Vein Endothelial Cells  [PDF]
Xiaojuan Yin, Zhu Chen, Weiqin Zhou, Wen Tang, Zhichun Feng
Open Journal of Obstetrics and Gynecology (OJOG) , 2018, DOI: 10.4236/ojog.2018.85054
Abstract: Objective: To construct to silence tissue factor (TF) expression in Human Umbilical Vein Endothelial Cells (HUVECs) for providing evidence of the gene therapy and prevention of coagulation dysfunction in placental abruption (PA) neonates. Methods: Cultured HUVECs in vitro were divided into control group and PA group, each including non-prevention, scramble siRNA and TF-siRNA subgroups. pENTRTM/U6-shRNA/TF vector expressing TF were constructed and transfected into HUVECs. The mRNA expression of TF was tested with RT-PCR, and TF protein expression was detected with immunofluorescence staining. Results: Monolayer HUVECs with short-rod and short spindle shaped were adherent to the bottom, forming paving stone arrangement. The TF mRNA expression was significantly different between control group and PA group (P < 0.01) and among different subgroups (P < 0.01). In non-prevention subgroups, significant difference was observed in TF mRNA expression between control group and PA group (P < 0.05). Significant difference in TF mRNA expression was found in false-prevention subgroups (P < 0.05). The TF mRNA expression was
Rapid determination of patulin in apple juice by tert-butyldimethylsilyl derivatization-gas chromatography-mass spectrometry

LI Fengge,YAO Weiqin,TIAN Yanhe,LI Xuewen,ZHANG Hongxia,DOU Hui,ZHU Huiping,

色谱 , 2010,
Abstract: 运用特丁基二甲基硅烷(TBDMS)衍生化气相色谱-质谱(GC-MS)联用法快速、高灵敏地测定了苹果汁中的棒曲霉素(PAT)。样品用乙酸乙酯-正己烷提取,Carb/C18混合型固相萃取柱净化,TBDMS衍生,GC-MS测定,选择离子监测(SIM)模式,外标法定量。在0.01~1 mg/L的范围内线性良好(r>0.98),在2~50 μg/kg的添加水平范围内,平均回收率为88%~98%,相对标准偏差(RSD)为5.3%~13.6%, PAT的检出限为0.5 μg/kg,测定低限为2 μg/kg。该方法快速、高灵敏、准确、专一、耐用,适合对苹果汁中PAT进行确证和定量测定。
Determination of melamine and cyanuric acid in milk by gas chromatography-mass spectrometry

LI Fengge,YAO Weiqin,SU Min,LI Shiyu,DOU Hui,SHANG Dejun,ZHU Huiping,

色谱 , 2009,
Abstract: 建立了气相色谱-质谱法测定牛奶中三聚氰胺和三聚氰酸含量的分析方法.样品经二乙胺-乙腈-水溶液超声提取,离心,滤液用氮气吹干后加入硅烷化衍生试剂衍生,气相色谱-质谱测定,选择离子模式监测,外标法定量.在0.025~2 mg/kg范围内,目标物的峰面积与其质量浓度的线性关系良好(r>0.98);在0.5,1.0和2.5 mg/kg的添加水平,三聚氰胺和三聚氰酸的平均回收率分别为84% ~87%和75% ~102% ,相对标准偏差(RSD)分别为5.7% ~11.7%和4.9% ~7.8% ;三聚氰胺和三聚氰酸的检出限(LOD)分别为0.05 mg/kg和0.10 mg/kg.结果表明:该方法简便、快速、灵敏、准确,适合牛奶中三聚氰胺和三聚氰酸的确证和定量测定.
Determination and confirmation of cyanuric acid ininfant formula using mixed-mode solid-phase extraction cartridge clean up-gas chromatography-mass spectrometry

LI Fengge,YAO Weiqin,TIAN Yanhe,DOU Hui,SU Min,ZHU Huiping,LI Xin,SHEN Mengyuan,

色谱 , 2010,
Abstract: 建立了一种混合型固相萃取柱净化-气相色谱-质谱法(GC-MS)测定婴幼儿配方奶粉中三聚氰酸的方法。在84 ℃条件下,用0.5%乙酸水溶液提取样品中的三聚氰酸,离心,滤液经Carb/C18混合型固相萃取柱净化,氮气吹干,硅烷化衍生,GC-MS测定,选择离子监测模式,外标法定量。在0.01~2 mg/L内线性关系良好(r>0.99),在0.25~2.5 mg/kg的添加水平范围内,平均回收率为80%~103%,相对标准偏差(RSD)为7.7%~14.5%,三聚氰酸的检出限(LOD)为0.10 mg/kg,定量限(LOQ)为0.25 mg/kg。该方法快速、灵敏、准确、专一、耐用,适合婴幼儿配方奶粉中三聚氰酸的确证和定量测定。
Diaqua(2,6-dihydroxybenzoato-κ2O1,O1′)bis(2,6-dihydroxybenzoato-κO1)bis(1,10-phenanthroline-κ2N,N′)lanthanum(III)–1,10-phenanthroline (1/1)
Yaling Cai,Weiqin Dong,Hongxiao Jin
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810047318
Abstract: In the title compound, [La(C7H5O4)3(C12H8N2)3(H2O)2]·C12H8N2, the LaIII atom is coordinated by four N atoms from two chelating 1,10-phenanthroline (phen) ligands, four O atoms from three 2,6-dihydroxybenzoate (DHB) anions (one monodentate, the other bidentate) and two water O atoms, completing a distorted LaN4O6 bicapped square-antiprismatic geometry. Within the mononuclear complex molecule, intramolecular π–π stacking interactions are observed, the first between a coordinated phen molecule and a DHB ligand [centroid–centroid distance = 3.7291 (16) ], and the second between a coordinated phen molecule and an uncoordinated phen ligand [centroid–centroid distance = 3.933 (2) ]. Intermolecular π–π stacking is observed between adjacent complexes [interplanar distance = 3.461 (3) ]. Intra- and intermolecular O—H...O hydrogen bonds are observed in the DHB ligands and between a water molecule and DHB ligands, respectively. O—H...N hydrogen bonds are also observed in the DHB ligands and between uncoordinated phen molecules and aqua ligands.
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