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Search Results: 1 - 10 of 120264 matches for " Yongmei Wang "
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Modeling and Solution of Economic Dispatch Problem for GTCC Units  [PDF]
Yongmei Wang, Hua Xiao
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B058
Abstract: Economic dispatch problem lies at the kernel among different issues in GTCC units’ operation, which is about minimizing the fuel consumption for a period of operation so as to accomplish optimal load dispatch among units. This paper has analyzed the load dispatch model of gas turbine combined-cycle (GTCC) units and utilizes a quantum genetic algorithm to optimize the solution of the model. The performance of gas turbine combined-cycle units varies with many factors and this directly leads to variation of model parameters. To solve the dispatch problem, variable constraints are adopted to correct the parameters influenced by ambient conditions. In the simulation, comparison of dispatch models for GTCC units considering and not considering the influence of ambient conditions indicates that it is necessary to adopt variable constraints for the dispatch model of GTCC units. To optimize the solution of the model, a Quantum Genetic Algorithm is used considering its advantages in searching performance. QGA combines the quantum theory with evolutionary theory of genetic algorithm. It is a new kind of intelligence algorithm which has been successfully employed in optimization problems. Utilizing quantum code, quantum gate and so on, QGA shows flexibility, high convergent rate, and global optimal capacity and so on. Simulations were performed by building up models and optimizing the solutions of the models by QGA. QGA shows better effect than equal micro incremental method used in the previous literature. The operational economy is proved by the results obtained by QGA. It can be concluded that QGA is quite effective in optimizing economic dispatch problem of GTCC units.
Diurnal Effects on Chinese Wild Ledum palustre L. Essential Oil Yields and Composition  [PDF]
Liangliang Zhang, Hongxiao Wang, Yongmei Wang, Man Xu, Xinyu Hu
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2017, DOI: 10.4236/jasmi.2017.72005
Abstract: This study was conducted to evaluate the diurnal effect on essential oil yield and composition of Ledum palustre L. grown in northern Inner Mongolia, China. Essential oil content and composition were determined and compared as a function of different harvesting times viz. 7:00 AM, 11:00 AM, 3:00 PM, 7:00 PM, and 11:00 PM within a day. The essential oil obtained by hydrodistillation was investigated by gas chromatography-mass spectrometry (GC-MS). The yield of essential oil was varied from 1.21% to 1.62%; the maximum oil yield was obtained at 3:00 PM and the minimum at 7:00 PM. Similar to oil yield, qualitative difference in essential oil composition of L. palustre was observed. For the best essential oil yields, L. palustre should be harvested during 11:00 AM to 3:00 PM.
Influences of cerebellar interpositus nucleus and fastigial nucleus on neuronal activity of lateral hypothalamic area
Jianjun Wang,Yongmei Pu,Tao Wang
Science China Life Sciences , 1997, DOI: 10.1007/BF02882046
Abstract: Stimulation of cerebellar interpositus nucleus and fastigial nucleus could influence the neuronal activity of lateral hypothalamic area in the cat, and some of the neurons which respond to the cerebellar stimulations are glucose-sensitive neurons. These results suggest that the cerebellum is involved not only in motor control, but also in the regulation of non-somatic functions through the cerebello-hypothalamic pathways.
Phonon Theory of Martensitic Transformation Precursors
Yongmei M. Jin,Yu U. Wang
Physics , 2014,
Abstract: A phonon theory of precursor phenomena in martensitic phase transformations is developed. Extending Gr\"uneisen theory of thermal expansion, this theory addresses the effects of deformation-dependent low-energy phonons on the structural, thermal, and elastic behaviors of pre-martensitic cubic crystals that undergo incomplete phonon softening. It reveals spontaneous symmetry breaking, pre-martensitic transformation, phonon domains, and tweed structure. The theory naturally explains the ubiquitous pre-transitional anomalies that are difficult to explain from conventional phase transition theories.
Martensitic Transformation Precursors: Phonon Theory and Critical Experiments
Yu U. Wang,Yongmei M. Jin
Physics , 2015,
Abstract: This paper addresses martensitic precursor phenomena from new theoretical and experimental perspectives. Driven by a phonon domain hypothesis, based on the premise of incomplete phonon softening, and employing Born's dynamical approach to statistical mechanics of anharmonic crystal lattices, we develop a Gruneisen-type phonon theory that predicts a pre-martensitic transition via "spinodal decomposition" of phonon populations and, without resort to static defects, explains the precursor "anomalies" on the same physical footing of thermal expansion, both being intrinsic properties of anharmonic crystal lattices. The theory reveals the nature of this pre-martensitic transition as phonon pseudo-Jahn-Teller instability transition, and predicts formation of elastic and phonon domains whose behaviors are primarily characterized by the broken dynamic symmetry of lattice vibrations rather than the broken static symmetry of crystal lattice and, as a particular case of Le Chatelier's principle, an internal relaxation in response to applied stress through phonon population redistribution in the domains. The predictions are critically tested by in-situ three-dimensional phonon diffuse scattering and Bragg reflection using high-energy synchrotron X-ray single-crystal diffraction, which observes exotic domain phenomenon in pre-martensitic austenite that is fundamentally different from the usual ferroelastic domain switching phenomenon in martensitic phase. The theory consistently explains the martensitic precursor "anomalies" from the viewpoint of phonon domains.
Effects of Thioglycolic Acid on Parthenogenetic Activation of Xenopus Oocytes
Zhuoran Wang,Xiaomei Ren,Dong Wang,Yongmei Guan,Lei Xia
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016220
Abstract: Existing in Permanent-wave solutions (PWS), thioglycolic acid (TGA) is widely used in hairdressing industry for its contribution to hair styling. However, the toxicity of TGA, especially its reproductive toxicity, gradually calls the attention of more and more researchers.
Influences of Tropical Cyclones on China During 1965--2004
Influences of Tropical Cyclones on China During 1965-2004

WANG Xiaoling,REN Fumin,WANG Yongmei,LI Weijing,
WANG Xiaoling
,REN Fumin,WANG Yongmei,LI Weijing

大气科学进展 , 2008,
Abstract: Using the Joint Typhoon Warning Center (JTWC) and China Meteorological Administration (CMA) tropical cyclone track datasets, variations in frequency and intensity of the affecting-China tropical cyclones (ACTCs) are studied for the period of 1965 2004. First, the differences between the two tropical cyclone datasets are examined. The annual frequencies of tropical cyclones in the western North Pacific basin are reasonably consistent to each other, while the intensity records are less reliable. The annual numbers of ACTCs based on different datasets are close to each other with similar interdecadal and interannual variations. However, the maximum intensity and the annual frequency of ACTCs for strong categories show great dependence on datasets. Tropical cyclone impacts on China show the same variations as the annual number of ACTCs and also show dependence on datasets. Differences in tropical cyclone impacts on China are mainly caused by datasets used. The annual frequency of ACTCs, especially the length of lifetime of ones that make landfall, and the intensity estimates all have effects on the value of impacts on China.
Estimating Tropical Cyclone Precipitation from Station Observations
REN Fumin,WANG Yongmei,WANG Xiaoling,LI Weijing,
REN Fumin
,WANG Yongmei,WANG Xiaoling,LI Weijing

大气科学进展 , 2007,
Abstract: In this paper, an objective technique for estimating the tropical cyclone (TC) precipitation from station observations is proposed. Based on a comparison between the Original Objective Method (OOM) and the Expert Subjective Method (ESM), the Objective Synoptic Analysis Technique (OSAT) for partitioning TC precipitation was developed by analyzing the western North Pacific (WNP) TC historical track and the daily precipitation datasets. Being an objective way of the ESM, OSAT overcomes the main problems in OOM,by changing two fixed parameters in OOM, the thresholds for the distance of the absolute TC precipitation (D0) and the TC size (D1), into variable parameters.Case verification for OSAT was also carried out by applying CMORPH (Climate Prediction Center MORPHing technique) daily precipitation measurements, which is NOAA's combined satellite precipitation measurement system. This indicates that OSAT is capable of distinguishing simultaneous TC precipitation rain-belts from those associated with different TCs or with middle-latitude weather systems.
Relationship of Post-Stroke Aphasic Types with Sex, Age and Stroke Types  [PDF]
Jingfan Yao, Zaizhu Han, Yanli Song, Lei Li, Yun Zhou, Weikang Chen, Yongmei Deng, Yongjun Wang, Yumei Zhang
World Journal of Neuroscience (WJNS) , 2015, DOI: 10.4236/wjns.2015.51004
Abstract: Aim: To explore what is the relationship of the types of post-stroke aphasia with sex, age and stroke types. Methods: Retrospective analysis was administrated on data of 421 patients with acute stroke. Western battery aphasia was used to measure aphasiac type and aphasia quotient (AQ) score. The patients were divided into three age groups: young, middle-aged and elderly. The stroke types were classified into cerebral infraction (CI) and intracerebral hemorrhage (ICH). Results: All subjects were right-handed, which males and females accounted for 69.60% and 30.40%, respectively. There were 116 cases of Broca’s aphasia (85 males), 35 cases of Wernicke’s aphasia (20 males), 15 cases of conductive aphasia (10 males), 63 cases of transcortical motor aphasia (50 males), 11 cases of transcortical sensory aphasia (8 males), 27 cases of transcortical combined aphasia (13 males), 73 cases of anomic aphasia (47 males) and 81 cases of global aphasia (60 males). Male patients (69.60%) have a significantly higher morbidity of aphasia than that of females (30.40%) after stroke (χ2 = 11.57
Exhaust emission characteristics of diesel and biodiesel  [PDF]
Yongmei Zhang, Hongjun You
Advances in Biological Chemistry (ABC) , 2011, DOI: 10.4236/abc.2011.13014
Abstract: The performances of diesel contrasted with that of biodiesel, such as HC and CO and NOx and fume and particles discharge, are studied on. The contents of HC, CO, NOx and flue gas are measured by Japan 163 Gas Chromatograph, USA 48 CO Analyser, Japan MEXA-7200H and FBY-201 flue gas analyzer, respectively. The experimental results shows HC dis-charge of biodiesel B20 decreases with the increase of rate of revolution; NOx discharge of biodiesel B5 and biodiesel B20 increase with the increase of torque; NOx discharge increases with the increase of adding biodiesel at the same torque; Flue gas discharge of biodiesel B5 and biodiesel B20 firstly increase and then decrease with the increase of torque; Particle discharge decreases with the increase of the amount of biodiesel.
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