|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Island partition of the distribution system with distributed generation显示文摘In this paper, a novel optimum island partition model based on Tree Knapsack Problem (TKP) is presented for the distribution system integrated with distributed generation (DG), and a Depth-first Dynamic Programming Algorithm (DPA) is used to solve this model. With the considerations of the load priority, controlled/uncontrolled loads, and the constraints of power balance, voltage and equipment capacity, the model can meet the practical engineering requirements very well. The island partition problem of the distribution system integrated with multiple DGs is first decomposed into multiple TKPs, each of which is solved by DPA respectively. Then, the initial optimum island partition scheme is gained through an island combination procedure, and the final island partition scheme is obtained after feasibility checking and adjustment. Since the algorithm proposed owns the advantages of strong theoretical foundation and low computational complexity, it can find the approximate optimal solution within a limited time. The results of examples demonstrate the validity of the new model and algorithm. | WANG XuDong & LIN JiKeng* Key laboratory of Power System Simulation and Control of Ministry of Education, Tianjin University, Tianjin 300072, China | 2010 | Science China(Technological Sciences)2010，53，11： | 21 |
| 2 | Object-oriented land cover classification using HJ-1 remote sensing imagery显示文摘The object-oriented information extraction technique was used to improve classification accuracy,and addressed the problem that HJ-1 CCD remote sensing images have only four spectral bands with moderate spatial resolution.We used two key techniques:the selection of optimum image segmentation scale and the development of an appropriate object-oriented information extraction strategy.With the principle of minimizing merge cost of merging neighboring pixels/objects,we used spatial autocorrelation index Moran's I and the variance index to select the optimum segmentation scale.The Nearest Neighborhood(NN) classifier based on sampling and a knowledge-based fuzzy classifier were used in the object-oriented information extraction strategy.In this classification step,feature optimization was used to improve information extraction accuracy using reduced data dimension.These two techniques were applied to land cover information extraction for Shanghai city using a HJ-1 CCD image.Results indicate that the information extraction accuracy of the object-oriented method was much higher than that of the pixel-based method. | SUN ZhongPing1,SHEN WenMing1,WEI Bin1,LIU XiaoMan1,SU Wei2,ZHANG Chao2 & YANG JianYu2 1 Satellite Environment Center,Ministry of Environmental Protection,Beijing 100094,China 2 College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,China | 2010 | Science China Earth Sciences2010，53，S1： | 15 |
| 3 | A general theoretical principle for single-phase convection heat transfer enhancement显示文摘The main methods of single-phase convection heat transfer enhancement are analyzed in this paper, and the unity of contradiction between heat transfer enhancement and energy consumption(or exergy destruction)is expounded.The thermodynamic relationship between heat(or exergy)transfer efficiency and energy consumption(or exergy destruction)as well as driving forces is established,and a general theoretical principle for single-phase convection heat transfer enhancement is further obtained. The principle shows that temperature gradient field distribution and velocity field distribution constrain each other,and that the optimum heat transfer efficiency can be obtained when they are synergetic.If the level of the synergy of temperature gradient field distribution with velocity field distribution is determined,the relative uniform temperature gradient is required,and vice versa.The principle also shows the relationship of relative temperature gradient with specific heat and coefficient of heat conductivity.The deduced results can be used as a theoretical guidance for single-phase convection heat transfer enhancement and optimum design of heat exchangers. | WANG SongPing CHEN QingLin ZHANG BingJian HUA Ben | 2009 | Science China(Technological Sciences)2009，52，12： | 12 |
| 4 | Optimum segmentation of simple objects in high-resolution remote sensing imagery in coastal areas显示文摘The optimum segmentation of ground objects in a landscape is essential for interpretation of high-resolution remotely sensed imagery and detection of objects; and it is also a technical foundation to efficiently use spatial information in remote sensing imagery. Landscapes are complex system composed of a large number of heterogeneous components. There are many explicit homogeneous image objects that have similar spectral character and yet differ from surrounding objects in high-resolution remote sensing imagery. Thereby, a new concept of Distinctive Feature of fractal is put forward and used in deriving Distinctive Feature curve of fractal evolution in multiscale segmentation. Through distinguishing the extremum condition of Distinctive Feature curve and the inclusion relationship of fractals in multiscale representation the Scalar Order is built. This can help to determinate the optimum scale in image segmentation for simple-objects, and the potential meaningful image-object fitting the intrinsic scale of the dominant landscape object can be obtained. Based on the application in high-resolution remote sensing imagery in coastal areas, a satisfactory result was acquired. | CHEN Jianyu1,2, PAN Delu1 & MAO Zhihua1 1. State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Admini- stration, Hangzhou 310012, China 2. Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, China | 2006 | Science China Earth Sciences2006，49，11： | 11 |
| 5 | Fuzzy Optimum Model of Semi-Structural Decision for Lectotype Optimization of Offshore Platforms显示文摘In the process of concept design of offshore platforms, it is necessary to select the best from feasible alternatives through comparison and filter. The criterion set, used to evaluate and select the satisfying alternative, consists of many qualitative and quantitative factors. Therefore, the selection is a problem of multicriteria and semi-structural decision-making. Different from traditional methods in semi-structural decision-making, a new framework and methodology is presented in this paper for evaluation of offshore platform alternatives. First, the criterion set is established for the evaluation of alternatives. Next, the approach is studied to construct the relative membership degree matrix, in which both qualitative and quantitative factors are consistent with the uniform calculating standard. And then a new weight-assessing method is developed for calculation of the weights based on the relative membership degree matrix.Finally, a multi-hierarchy fuzzy optimum model is adopted to select the satisfying offshore platform alternative. A case study shows that the new framework and methodology are scientific, reasonable and easy to use in practice. | 陈守煜 伏广涛 王建明 刘刚 | 2001 | China Ocean Engineering2001，16，4： | 10 |
| 6 | Use of Selection Indices Based on Multivariate Analysis for Improving Grain Yield in Rice | Hossein SABOURI Babak RABIEI Maryam FAZLALIPOUR | 2008 | Rice science2008，15，4： | 9 |
| 7 | Study on patterns and chemical features of NO effect on marine phytoplankton growth显示文摘This article discusses the patterns of NO effect on marine phytoplankton growth from chemical perspective.The experimental results of four algae,which are Platymonas hal-golandica var.tsingtaoensis,Platymonas subcordiformis,Skeletonema costatum and Nitzschia closterium farma minutissima,are as follows:(i) In f/2 medium or f/50 medium,the growth of these four algae was obviously promoted or inhibited when nitric oxide of different concentrations was added once or twice each day during the cultivation;(ii) The NO effects on the growth of marine phytoplankton are in normal distribution.Different phytoplankton has different optimum NO concentration,which is consistent with the influence of NO on the growth of high plants;(iii) The effect of NO on Platymonas halgolandica var.tsingtaoensi,which is a food alga,is different from that on the red tide algae Skeletonema costatum and Nitzschia closterium farma minutis-sima.The authors put forward a new opinion that every alga has its own NO threshold concen-tration.All the above results may provide new clues to understand the formation of red tide. | ZHANG Zhengbin LIN Cai LIU Chunying XING Lei WU Zhenzhen SUN Feng | 2005 | Science China Chemistry2005，48，4： | 9 |
| 8 | Application of computer-aided engineering optimum design method in aluminum profile extrusion mould显示文摘The finite element analysis and the optimum design of aluminum profile extrusion mould were investigated using the ANSYS software and its parameterized modeling method. The optimum dimensions of the mould were obtained. It is found that the stress distribution is very uneven, and the stress convergence is rather severe in the bridge of the aluminum profile extrusion mould. The optimum height of the mould is 70.527 mm, and the optimum radius of dividing holes are 70.182 mm and 80.663 mm. Increasing the height of the mould in the range of 61.282 mm to 70.422 mm can prolong its longevity, but when the height is over 70.422 mm, its longevity reduces. | 帅词俊 肖刚 倪正顺 钟掘 | 2003 | Journal of Central South University of Technology2003，10，1： | 8 |
| 9 | 牛小肠碱性磷酸酶部分性质研究显示文摘用正丁醇抽提、硫酸铵分级沉淀、EAE-32柱层析和Sephadex G-150凝胶过滤,从牛小肠中分离纯化出牛小肠碱性磷酸酶(BIAP).提纯倍数为50.69,比活力为48.87U/mg蛋白.酶液经SDS-PAGE呈现单一条带,且不含DNA核酸酶.该酶催化对硝基苯磷酸二钠(p-NPP)水解反应的最适pH值为9.7,pH小于6.5大于11.5均不稳定;最适温度为45℃,高于50℃不稳定.45℃,pH 9.7时K_m值为0.29mmol/L,最大反应速度(V_(max))为4.6μmol/(L·min).利用SDS-PAGE测定酶亚基的分子量为66 kD.Mg^(2+)、Mn^(2+)和Ca^(2+)对酶有不同程度的激活作用,Zn^(2+)和EDTA对酶有抑制作用.随着Mg^(2+)、Zn^(2+)和EDTA浓度增加,270nm处紫外吸收值增加. | 余同 张营 赵欣平 高举 杨梅强 Xin-Ping Mei-Qiang | 2009 | 四川大学学报(自然科学版)2009，46，6： | 8 |
| 10 | Statistical design and kinetic and thermodynamic studies of Ni(Ⅱ) adsorption on bentonite显示文摘The adsorption of the bentonite toward Ni(II) from aqueous solution was studied to obtain optimum conditions,equilibrium model,thermodynamic and kinetic parameters.Statistical method was used to evaluate maximum amount of adsorbed Ni(II).In this work,p H of solution during stirring,contact time,initial Ni(II) concentration,particle size of bentonite and amount of bentonite were considered as effective parameters which should be examined.The increase of temperature has negative effect on the Ni(II) adsorption.The equilibrium data were correlated well with Freundlich and Dubinin–Radushkevich isotherm models the correlation coefficients of which are(R^2) 0.994 and 0.971,respectively.This model indicates heterogeneous and chemical absorption or ion exchange process.The values of thermodynamic parameters such as ΔH°,ΔS° and ΔG° of nickel adsorption reveal that it is a spontaneous,exothermic and associative process.The experimental data fit the pseudo-second-order kinetic very well with correlation coefficient(R^2) more than 0.995. | Bahareh Sadeghalvad Amir Reza Azadmehr Hassan Motevalian | 2017 | Journal of Central South University2017，24，7： | 6 |
| 11 | BASIC FLOW PATTERNS AND OPTIMUM HYDRAULIC DESIGN OF A SUCTION BOX OF PUMPING STATION显示文摘A numerical method based on 3 D turbulence flow was applied to simulate the flow pattern in suction boxes of six different types. In light of the computational results, the basic flow patterns in the boxes were revealed and a theoretical method to optimize hydraulically design of the suction box is developed. The box geometrical parameters, which influence the flow pattern in the box, could be optimized. The optimum criteria for the hydraulic design of the suction boxes of six types established, respectively. Furthermore, a summarization is given here based on the classification of the basic flow patterns in order to systematically understand the hydraulic design of suction boxes. | Lu Lin guang Yangzhou University, Yangzhou 225009, P.R.China (Received April 14, 2000) | 2000 | Journal of Hydrodynamics2000，12，4： | 6 |
| 12 | 借助广义判据对多管火箭预估模型实施最优控制(英文)显示文摘利用广义判据 ,给出非线性系统的最优控制解 ,介绍预估多管火箭系统最优控制的一种通用算法 . | 姚俊 | 2000 | 弹道学报2000，12，2： | 5 |
| 13 | 微生物发酵转化黄姜生成薯蓣皂苷元的工艺研究显示文摘筛选到一株能高效转化薯蓣皂苷生成薯蓣皂苷元的菌株,并进行液体发酵转化,HPLC检测发酵前后薯蓣皂苷及薯蓣皂苷元含量的变化,表明经菌株的转化作用后,黄姜中的薯蓣皂苷生成薯蓣皂苷元。本研究对发酵条件包括培养基成份,底物浓度,装量,接种量,转速进行优化,并找到充分利用黄姜的生态环保的预处理方法,建立了一种高效清洁的薯蓣皂苷元生产工艺. | 喻东 沈竞 高陪 苏建 孙启玲 Qi-Ling | 2009 | 四川大学学报(自然科学版)2009，46，6： | 5 |
| 14 | OPTIMUM CONTROL OF VIBRATION AND STRUCTURE-BORNE NOISE FOR MACHINERY ON FLEXIBLE FOUNDATION显示文摘OPTIMUMCONTROLOFVIBRATIONANDSTRUCTURE-BORNENOISEFORMACHINERYONFLEXIBLEFOUN-DATIONOPTIMUMCONTROLOFVIBRATIONANDSTRUCTURE-BORNEN... | Xiong Yeping Song Kongjie Wang Chun ( Shandong University of Technology) | 1996 | Chinese Journal of Mechanical Engineering1996，9，1： | 4 |
| 15 | Seasonal dependency of controlling factors on the phytoplankton production in Taihu Lake, China显示文摘In this study, 44 profiles of gross primary productivity(GPP) and sunlight, along with water temperature, Chlorophyll-a(Chla) and nutrients, were observed in Meiliang Bay of Taihu Lake, China, in the spring, summer, and fall seasons. Effects of water temperature, light,and nutrient concentration were examined in relation to the GPP-unit-Chla(GPP of algae per Chla). The results showed that the optimum temperature for the GPP of phytoplankton was 27.9°C, the optimal PNA-unit-Chla(photon number absorbed by phytoplankton per Chla) was 0.25(mol), and the HSCN-unit-Chla and HSCP-unit-Chla(half-saturation constants of nitrogen and phosphorus of algae per Chla) were 0.005(mg/L) and 0.0004(mg/L), respectively. The seasonal dependency of the effect of different factors on the GPP was analyzed. Compared with temperature and nutrients, light was found to be the most important factor affecting the GPP during the three seasons. The effect of temperature and nutrients on the GPP of phytoplankton has obvious seasonal change. In spring, temperature was the secondary factor affecting the GPP of phytoplankton, and the effect of nutrients may be negligible in the eutrophic lake on account of temperature limit, which showed that the GPP of algae was only affected by the physical process. In summer and fall, temperature didn't affect the GPP of algae, and the presence of nutrients was the secondary factor affecting the GPP of phytoplankton. From summer to fall, effect of phosphorus was weakened and effect of nitrogen was enhanced. | Qiaohua Zhao Jing Wang Jianjian Wang Julian X.L.Wang | 2019 | Journal of Environmental Sciences2019，31，2： | 4 |
| 16 | AN OPTIMUM VEHICULAR PATH ALGORITHM FOR TRAFFIC NETWORK BASED ON HIERARCHICAL SPATIAL REASONING显示文摘Human beings’ intellection is the characteristic of a distinct hierarchy and can be taken to construct a heuristic in the shortest path algorithms.It is detailed in this paper how to utilize the hierarchical reasoning on the basis of greedy and directional strategy to establish a spatial heuristic,so as to improve running efficiency and suitability of shortest path algorithm for traffic network.The authors divide urban traffic network into three hierarchies and set forward a new node hierarchy division rule to avoid the unreliable solution of shortest path.It is argued that the shortest path,no matter distance shortest or time shortest,is usually not the favorite of drivers in practice.Some factors difficult to expect or quantify influence the drivers’ choice greatly.It makes the drivers prefer choosing a less shortest,but more reliable or flexible path to travel on.The presented optimum path algorithm,in addition to the improvement of the running efficiency of shortest path algorithms up to several times,reduces the emergence of those factors,conforms to the intellection characteristic of human beings,and is more easily accepted by drivers.Moreover,it does not require the completeness of networks in the lowest hierarchy and the applicability and fault tolerance of the algorithm have improved.The experiment result shows the advantages of the presented algorithm.The authors argued that the algorithm has great potential application for navigation systems of large_scale traffic networks. | Lu Feng Zhou Chenghu Wan Qing | 2000 | Geo-Spatial Information Science2000，3，4： | 4 |
| 17 | Anal cancer treatment:Current status and future perspectives显示文摘Anal cancers(AC)are relatively rare tumors.Their incidence is increasing,particularly among men who have sex with other men due to widespread infection by human papilloma virus.The majority of anal cancers are squamous cell carcinomas,and they are treated according to stage.In local and locally advanced AC,concomitant chemoradiation therapy based on mitomycin C and 5-Fluorouracil(5-FU)is the current best treatment,while metastatic AC,chemotherapy with 5-FU and cisplatin remains the gold standard.There are no indications for induction or maintenance therapies in locally advanced tumors.Many novel strategies,such as targeted therapies,vaccination,immunotherapy and photodynamic therapy are in clinical trials for the treatment of AC,with promising results in some indications. | Marwan Ghosn Hampig Raphael Kourie Pamela Abdayem Joelle Antoun Dolly Nasr | 2015 | World Journal of Gastroenterology2015，21，8： | 4 |
| 18 | Spatial patterns of vegetation and climate in the North China Plain during the Last Glacial Maximum and Holocene climatic optimum显示文摘Reconstructing the spatial patterns of regional climate and vegetation during specific intervals in the past is important for assessing the possible responses of the ecological environment under future global warming scenarios. In this study, we reconstructed the history of regional vegetation and climate based on six radiocarbon-dated pollen records from the North China Plain. Combining the results with existing pollen records, we reconstruct the paleoenvironment of the North China Plain during the Last Glacial Maximum(LGM) and the Holocene Climatic Optimum(HCO). The results show that changes in the regional vegetation since the LGM were primarily determined by climatic conditions, the geomorphic landscape and by human activity.During the LGM, the climate was cold and dry;mixed broadleaf-coniferous forest and deciduous-evergreen broadleaf forest developed in the southern mountains, and cold-resistant coniferous forest and mixed broadleaf-coniferous forest were present in the northern mountains. The forest cover was relatively low, with mesophytic and hygrophilous meadow occupying the southern part of the plain, and temperate grassland and desert steppe were distributed in the north;Chenopodiaceae-dominated halophytes grew on the exposed continental shelf of the Bohai Sea and Yellow Sea. During the HCO, the climate was warm and wet;deciduous broadleaf forest and deciduous-evergreen broadleaf forest, with subtropical species, developed in the southern mountains, and deciduous broadleaf forest with thermophilic species was present in northern mountains. Although the degree of forest cover was greater than during the LGM, the vegetation of the plain area was still dominated by herbs, while halophytes had migrated inland due to sea level rise. In addition, the expansion of human activities, especially the intensification of cultivation,had a significant influence on the natural vegetation. Our results provide data and a scientific basis for paleoclimate modelling and regional carbon cycle assessment in north China, with implications for predicting changes in the ecological environment under future global warming scenarios. | Manyue LI Shengrui ZHANG Qinghai XU Jule XIAO Ruilin WEN | 2019 | Science China Earth Sciences2019，62，8： | 4 |
| 19 | 一种基于最佳指数模型的TM遥感影像最佳波段组合计算方法显示文摘如何通过定量计算选择最佳波段组合一直是TM等多波段遥感影像信息提取的研究热点。本文综合利用Erdas提供的可视化空间建模工具(Spatial Modeler)和面向对象的编程技术,提出了一种基于最佳指数(Optimum Index Factor,OIF)的定量计算与定性分析相结合的TM遥感影像最佳波段组合方法。实验证明,该方法快速有效,极大提升了TM等多波段遥感影像最佳波段组合的计算过程。 | 许泉立 易俊华 | 2014 | 测绘与空间地理信息2014，37，4： | 3 |
| 20 | Neuro-Optimal Guidance Control for Lunar Soft Landing显示文摘Returning to moon has become a top topic recently. Many studies have shown that soft landing is a challenging problem in lunar exploration. The lunar soft landing in this paper beginsfrom a 100km circular lunar parking orbit. Once the landing area has been selected and it is time to deorbit for landing, a burn of 19.4m/s is performed to establish a 100× 15km elliptical orbit. At perilune, the landing jets are ignited, and a propulsive landing is performed. A guidanceand control scheme for lunar soft landing is proposed in the paper, which combines optimal theory with nonlinear neuro-control. Basically, an optimal nonlinear control law based on artificial neural network is presented, on the basis of the optimum trajectory from perilune to lunar surface in terms of Pontryagin’s maximum principle according to the terminal boundary conditions and performanceindex. Therefore some optimal control laws can be carried out in the soft landing system due to thenonlinear mapping function of the neural network. The feasibility and validity of the control laws are verified in a simulation experiment. | Wang, Dayi Li, Tieshou Yan, Hui Ma, Xingrui | 1999 | Journal of Systems Engineering and Electronics1999，10，3： | 3 |
您所在的机构暂未开通此部分的功能，请联系管理员