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电力市场环境下发电商电能分配策略研究

中国电机工程学报 2008年第10期28卷 111-117页

作者：刘敏吴复立贵州大学电气工程学院贵州省贵阳市550003 香港大学电机电子工程系

电力市场环境下,电能现货交易价格的高度不确定性给发电商带来了很大的交易风险。双边合同交易市场的设立为发电商提供了一个有效的风险规避途径。因此,制订合理的交易策略,合理的分配现货市场和双边合同市场交易份额有助于发电商在最... 详细信息

电力市场环境下,电能现货交易价格的高度不确定性给发电商带来了很大的交易风险。双边合同交易市场的设立为发电商提供了一个有效的风险规避途径。因此,制订合理的交易策略,合理的分配现货市场和双边合同市场交易份额有助于发电商在最大程度上实现利润最大化和风险最小化的交易目标。基于均值–方差原理提出了一个发电商交易策略构建模型,该模型充分考虑交易计划期内每个交易时段的电价特性并针对每个交易时段制订不同的交易策略。基于美国PJM电力市场历史数据的仿真结果验证了该模型的合理性和有效性。该文的研究结果为发电商的交易策略制定提供了一种解析分析的途径。

关键词：电力市场现货市场双边合同市场交易策略风险管理效用函数

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Assessment of the piroxicam-incited model of synchronized colitis in T-cell receptor alpha chain-deficient mice

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Animal Models and Experimental Medicine 2024年第4期7卷 533-543页

作者： Maximo E.Lange Danisa M.Bescucci Valerie f.Boras Tony Montina G.Douglas Inglis Lethbridge Research and Development Centre Agriculture and Agri-Food CanadaLethbridgeAlbertaCanada Alberta Health Services Chinook Regional HospitalLethbridgeAlbertaCanada Department of Chemistry and Biochemistry University of LethbridgeLethbridgeAlbertaCanada Southern Alberta Genome Sciences Centre University of LethbridgeLethbridgeAlbertaCanada

Background:A multitude of mouse models are utilized to emulate and study intestinal inflammation.T-cell receptor alpha chain(TCRα)-deficient mice are used as a model of spontaneous colitis that has similarities with human ulcerative ***,colitis is triggered late in the life of the mouse(age:4-5 months),and inflammation does not develop at the same time in different mice.A previously conducted study reported that the administration of the drug piroxicam triggered predictable and early colitis in TCRα-deficient mice at the age of 6-8 ***,a detailed characterization of ensuing inflammation was not ***:We conducted an in-depth examination of piroxicam-triggered colitis in TCRα-deficient mice,with emphasis on spatial histopathologic changes and analysis of expression of inflammatory ***,we tested amelioration of colitis with ***:We confirmed that piroxicam induced a time-prescribed colitis and did so in the proximal colon as well as the cecum of TCRα-deficient *** adminis-tration was observed to induce epithelial hyperplasia,goblet cell loss,and leukocyte infiltration with occasional ulceration.A Swiss roll technique was used to examine the colon and cecum in its ***,we observed that inflammation was mul-tifocal segmental,with areas of tissue damage in between healthy *** addition,we observed variability in the severity of inflammation among replicate animals and treatments,and that the administration of dexamethasone only partially ameliorated inflammation in the proximal ***:Piroxicam consistently induced multifocal segmental colitis in the proxi-mal colon and cecum,although the degree of inflammation was reduced in the ***,spatial variability in inflammation in the large intestine and the inter-replicate variation in the severity of inflammation must be taken into consideration when utilizing this murine model of synchronized colitis.

关键词： colon dexamethasone histology induction inflammation knockout

Comparative utility of vestibular function tests in patients with peripheral and central vestibular dysfunction

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Journal of Otology 2024年第1期19卷 5-9页

作者： Cameron B.fattahi Christopher Zaro Janice J.Chung Richard f.Lewis Divya A.Chari Department of Otolaryngology-Head and Neck Surgery UMASS Memorial Medical CenterUniversity of Massachusetts Chan Medical SchoolWorcesterMAUSA Jenks Vestibular Physiology Laboratory Massachusetts Eye and EarBostonMAUSA Department of Otolaryngology-Head and Neck Surgery Massachusetts Eye and EarHarvard Medical SchoolBostonMAUSA Department of Neurology Harvard Medical SchoolBostonMAUSA

Background: Bithermal caloric irrigation, video head impulse test(vHIT), and rotational testing are commonly used to assess peripheral vestibular function, but the relative clinical utility of each test in differentiating patients with peripheral vestibulopathy is ***: To determine whether(1) the combination of two or more vestibular tests enhances diagnostic utility over a single test;(2) abnormal test results on vestibular tests correlate with one ***: Retrospective analysis of data collected from multidisciplinary vestibular clinics at two academic medical centers from 2016 to ***: 150 patients(54.10 ± 15.09 years, 88 females) were included. No individual test was significantly better at predicting the presence of peripheral vestibular damage(p > 0.05). vHIT test results improved significantly when combined with either the caloric test(p = 0.007) or rotary chair test(p = 0.039). Caloric and rotational testing had high sensitivity(74.65% and 76.06%, respectively) and specificity(83.54% and 78.48%, respectively). vHIT demonstrated excellent specificity(89.87%) but poor sensitivity(47.89%). Caloric, vHIT, and rotary chair tests results did not correlate with one another(p > 0.05).Conclusions: Vestibular function tests have comparable diagnostic utility, yet each offers unique advantages. Caloric and rotational testing may be best suited for screening peripheral damage and vHIT may function ideally as a confirmatory test.

关键词： vestibular patients specificity

Author Correction: Graph neural networks for an accurate and interpretable prediction of the properties of polycrystalline materials

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npj Computational Materials 2022年第1期8卷 1132-1134页

作者： Minyi Dai Mehmet f.Demirel Yingyu Liang Jia-Mian Hu Department of Materials Science and Engineering University of Wisconsin-Madison Madison WI USA Department of Computer Sciences University of Wisconsin-Madison Madison WI USA

The authors became aware that the message passing (via the term D^^(−1/2)A^D^^(−1/2)) between neighboring nodes was not implemented in the layer-wise update function (Equation (1)) due to an error in the original code of the graph neural network (GNN) *** code modification,the following changes have been made to the original version of this Article.

关键词： neighboring polycrystalline passing

Effects of Growth Temperature on Structural and Electrical Properties of Li-N-H Codoped ZnO

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Journal of Materials Science & Technology 2013年第2期29卷 154-156页

作者： Y.f. Lu Z.Z. Ye L.P. Zhu Y.J. Zeng J.Y. Huang B.H. Zhao State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University

Effects of growth temperature on the structural and electrical properties of Li-N-H codoped ZnO thin films grown by DC reactive magnetron sputtering were investigated. Scanning electron microscopy and X-ray diffraction results showed that increasing growth temperature could improve the crystalline quality. But Hall measurement results showed that growth temperature had a nonlinear influence on the electrical property. The variation of electrical properties with the growth temperature was found to be related to the activated concentration of N in ZnO and the evaporation of Li during the growth process, derived from the Hall measurement and the second ion mass spectroscopy measurement.

关键词： ZnO Codoped Growth temperature Structural property Electrical property

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开放式喷射汽车风洞的尺寸和效率

同济大学学报（自然科学版） 2022年第S01期50卷 79-88页

作者： E.MERCKER R.BLUMRICH J.WIEDEMANN f.WITTMEIER 斯图加特汽车工程与车辆发动机研究所(fKfS) 德国斯图加特70569

近年来,世界各地汽车企业已建成许多汽车风洞,并在不久的将来会有更多汽车风洞的规划与建设。在风洞规划设计阶段确定的许多功能与参数决定了其整个运行生命周期,并影响建设和运行成本。本文研究通过适当选择3/4开口风洞的试验段几何尺... 详细信息

近年来,世界各地汽车企业已建成许多汽车风洞,并在不久的将来会有更多汽车风洞的规划与建设。在风洞规划设计阶段确定的许多功能与参数决定了其整个运行生命周期,并影响建设和运行成本。本文研究通过适当选择3/4开口风洞的试验段几何尺寸,可以使早期的传统风洞中因有限截面发生的流动干扰在很大程度上得到补偿或减少到可忽略不计的程度。研究表明:对于具有不同堵塞度的各种车辆,流动干扰误差出乎意料地可以忽略,因此不需要对试验数据进行修正,这使得汽车风洞试验形成“自由”气流条件;试验阶段的初步尺寸可以比如今常见的情况小很多,也不影响测量结果的准确度,这带来了更低的建设成本,也降低了风洞系统运行的能源需求;自由射流的不稳定性必须被考虑,且射流长度不应该超过某个上限。

关键词：汽车风洞干扰效应车辆空气动力学

High-cycle fatigue and fracture behaviours of SLM AlSi10Mg alloy

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Transactions of Nonferrous Metals Society of China 2020年第10期30卷 2577-2589页

作者： S.GLODEŽ J.KLEMENC f.ZUPANIČ M.VESENJAK faculty of Mechanical Engineering University of MariborSmetanova 172000 MariborSlovenia faculty of Mechanical Engineering University of LjubljanaAškerčeva 61000 LjubljanaSlovenia

The high-cycle fatigue and fracture behaviours of the selective laser melting(SLM)AlSi10Mg alloy were *** specimens were designed directly in the shape required for the fatigue tests under pulsating loading in tension(R=0,R is the dynamic factor).The fatigue−life(S−N)curves were modelled with a conditional Weibull’s probability density function,where the real-valued genetic algorithm(GA)and the differential ant-stigmergy algorithm(DASA)were applied to estimating the needed Weibull’s *** fractography of the fatigue specimens showed that the fatigue cracks initiated around the surface defects produced by SLM and then propagated in an unstable ***,the presence of large SLM defects mainly influenced the crack initiation period and did not have a strong influence on the crack *** obtained experimental results present a basis for further investigation of the fatigue behaviour of advanced materials and structures(*** metamaterials)fabricated by additive manufacturing(AM).Especially,in the case of two-dimensional cellular structures,the cross-section of cellular struts is usually rectangular which corresponds to the specimen shape considered in this work.

关键词： selective laser melting AlSi10Mg alloy high-cycle fatigue fracture behaviour

CRYSTAL STRUCTURE DETERMINATION AND IMAGE PROCESSING IN HIGH RESOLUTION ELECTRON MICROSCOPY

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电子显微学报 1991年第2期 213-214页

作者： f.H. LiInstitute of Physics, Chinese Academy of Sciences, Beijing 100080, China

The development of high resolution electron microscopy(HREM) has providedan approach to determine the average structure of minute crystals and the localstructure of defected crystals. The high resolution electron microscope imagestaken under the Scherzer defocus condition mirror the projected structure ofexamined crystals if the sample is very thin. However, it is difficult to set the

关键词： PPDf CRYSTAL STRUCTURE DETERMINATION AND IMAGE PROCESSING IN HIGH RESOLUTION ELECTRON MICROSCOPY HREM

Creep Induced Phase Transformation in Extruded Zn-Al Alloy

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Journal of Materials Science & Technology 1997年第6期13卷 503-507页

作者： Y.H.ZHU and J.Juarez Islas(Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Apartado P.70-360,Mexico D.f.04510, Mexico)E. Orozco(Instituto de fisica, Universidad Autonoma de Mexico, Apartado P.20-364, Mexico D.f.04510, Instituto de Investigaciones en Materiales Universidad Nacional Autonoma de Mexico Mexico D. F. 04510 Apartado P. 70-360 Mexico Instituto de fisica Universidad Autonoma de Mexico Mexico D. F. 04510 Apartado P. 20-364 Mexico

Phase transformation and microstructural change of an extruded eutectoid Zn-Al alloy Zn76Al22Cu2 (wt pct) were investigated during creep testing by using SEM and X-ray diffraction techniques. Creep induced decomposition of a metastable η'T phase and a four phase transformation, α+ ε →T' +η, occurred during the creep testing. Also a microstructural change was observed from a lamellar structure into a spheroidized structure in the rupture part of the extruded alloy. It provided evidence of creep induced phase transformations which occurred in ageing process. The mechanism of creep rupture of the extruded Zn-Al alloy was also discussed.

关键词： Al Zn Creep Induced Phase Transformation in Extruded Zn-Al Alloy