共查询到20条相似文献，搜索用时 15 毫秒
1.
Based on analysis of the function of dummy arrow in network diagram, this paper provides some methods to determine and delete additional arrows. It will be helpful to personnel in engineering network planning for determining and deleting the additional dummy arrows quickly and correctly. 相似文献
2.
In this paper, partial differential equations of vortex flow-stream function in boundary fitted coordinates and related ADI equations were listed. The flow around a cylinder in quadrilateral area by auto control boundary was computed. The diagram of distribution of speed arrow, constant lines of flow-stream function, vortex, two speed parts and pressure were studied. 相似文献
3.
This paper gives a new approach to solve the problem of features recognition of parts drawing form by means of multi - layers BP neural network. The concept and arithmetic of expanding property matrix of parts drawing are brought forward. A feature recognition and extraction system of 2D revolving parts drawing is developed by means of secondary development of AutoCAD R2000. These works have high theoretical and practical value. 相似文献
4.
WANG Hong-chun~ 《保鲜与加工》2004,(8):96-99
The Causality Diagram, which adopts graphical expression of knowledge and direct causal intensity of causality, overcomes some shortages in Belief Network and has evolved into a mixed causality diagram methodology coped with discrete and continuous variable. But the Causality Diagram's reasoning calculation is a NP problem. It is inconvenient its popularize and application. This paper presents an approximate reasoning algorithm, and it cuts down the Causality Diagram's steps and harsh condition, it makes the complexity of the algorithm the same order of the joint events. A reasoing example justifies our algorithm. 相似文献
5.
本人选取近年新建的居住区滨湖花园作为研究对象,调查方法采用现场逐步记录的方法调查植物材料和植物配置方式,并通过对典型场景取样摄影以及实测绘图的方法来完成。通过分析,得出结论：园林树种的多样性仍需提高,尤其增加季相植物种类,重视多年生草本植物的应用。完善并拓宽种植设计的设计方法,给人以丰富的感觉体验。重视绿化的生态设计和构建多样化的园林空间。 相似文献
6.
This paper introduces the modeling of Unified Modeling Language with use case diagram and active diagram based on Rational Unified Process for Equipment Managemet Information System. It discusses the modeling mechanism and character of UML and develops the Computer Equipment management Information System Based Web using Rational Rose of UML CASE Tool. First, it is describe the authors how to analyze the structure of organize and build the model of structure organize. Second, they abstract the workflow of main operation in organize and build workflow model by active diagram. Finally, they abstract actor, use case with case diagram and finish the requirement model. 相似文献
7.
LIANG Xin-yuan~ 《保鲜与加工》2004,(8):75-78
Causality diagram methodology is a probabilistic reasoning, which can be applied to fault analysis. However, it lacks analysis on the importance of failure mode. The importance of failure mode is introduced to develop causality diagram methodology, which is successfully applied in fault analysis of gas explosion in colliery. The study shows that causality diagram based on importance of failure mode is an effective qualitative and quantitative method to analyse faulty, evaluate system safety and provide feasible countermeasures to prevent accidents. 相似文献
8.
《Journal of Landscape Research》2015,(6)
CorelDRAW has particular uses in architectural design, interior design and landscape design. By comparing several software, it was found that CorelDRAW had the working plan drawing of AutoCAD, mapping of 3DMAX, and better typesetting than Photoshop had, thus it plays an irreplaceable role in drawing working plan of environmental art design, especially colored plane and elevation view drawings. 相似文献
9.
天柱山2011.7.23特大雷电灾害天气动力学分析 总被引：1，自引：1，他引：0
为了提高雷电灾害天气预报能力,服务天柱山旅游业。运用安徽省天柱山气象站地面观测气象资料、合肥多普勒天气雷达回波资料和美国NCEP全球分析FNL资料,对2011年7月23日天柱山特大雷电灾害天气过程进行了详细的分析。结果表明,环流特征为测站上空受槽前西南气流及低层较强的暖平流影响,贴地层在西太平洋伸向内陆的热带低压环流内,200 hPa为副热带西风急流。1000~ 700 hPa假相当位温随高度减小近10℃,在T-lnp图上抬升凝结高度和自由对流高度接近1000 hPa高度上,平衡高度伸至200~300 hPa之间,对流有效位能为2058 J/kg,而对流抑制能量在300 hPa以上。14时低层气温和比湿增量大于中高层,表明气层稳定度减小。低层为湿层并有湿舌从东北方向伸向测站,测站位于舌尖端;中高层为干层覆盖,这种湿度垂直分布非常有利雷暴出现。雷暴在雷达回波图上具有明显特征。 相似文献
10.
SHI Qing-xi~ 《保鲜与加工》2006,(4):111-114
The Causality Diagram theory,which adopted graphical expression of knowledge and direct causality intensity of causality,overcomes some shortages in Belief Network and has evolved into a mixed causality diagram methodology coped with discrete and continuous variable.But it is difficult that the structure of Causality Diagram given by expert.Because the complexity of causality diagram structure goes up exponentially through the number of the vertex's increasing,it is NP-hard problem to find the most possible structure from a set of data.The authors discuss approaches and present Genetic Algorithm,to find the most possible structure from a set of data.Experiment shows the method is effective. 相似文献
11.
山西省拥有丰富的农村旅游资源,并且可致力于农村旅游资源的开发,而旅游电子商务是当前旅游业发展的新形式,电子商务和旅游业具有天生的适应性,所以农村旅游电子商务的建设与应用对于推动农村旅游的发展起着关键作用。如果在此过程中,加入农产品交易的整合发展,那将是一条具有创新模式的、切实可行的发展之路。这必将为山西省转型跨越发展发挥积极作用。 相似文献
12.
BP人工神经网络在土地集约利用评价中的应用研究——以浙江省遂昌工业园区为例 总被引：1，自引：0，他引：1
为了探索土地集约利用评价的新途径,笔者尝试运用BP人工神经网络模型及实证分析的方法对浙江省遂昌工业园区的土地集约利用水平进行评价。研究结果表明,遂昌工业园区的土地集约利用程度在浙江省处于中下水平,导致集约度偏低的主要原因在于土地建成率不高,工业用地产出强度和固定资产投入强度偏低。并得出以下研究结论,BP人工神经网络体现了土地集约利用评价的科学性与合理性,能很大程度上避免人为因素对评价结果的影响,具有很强的实际应用价值。 相似文献
13.
This paper applies the evidence combination theory to fuse the information of multi-neural network classifier. In order to make each classifier approach the ideal state, the heredity algorithm is applied to train it. The different capacity of each classifier is caused by different classified feature. Input feature can't be identified by one classifier and may be identified by another, Model identification can be performed by multi-classifier, output result can be thought of evidence, further more,the BPA of each classifier is determined, then the procession of the model identification must be improved. 相似文献
14.
Mi Linshu Liu Fangning 《保鲜与加工》1988,(3)
A straightforward and unified approach for solving the large-scale, faulted power systems is presented in this paper. In contrast .with conventional algorithms, the various changes of topology and impedance of the systems and its boundary conditions of fault can be handled flexibility and effectively in one-step procedure by proposed method, and it is convenient to choose the computational procedure more resonable according to the situation of power systems. One of the noteworthy features of the proposed method is the natural manner to handle mutual effects, and it is easy to design programs. The calculating technique for easy-to-program is given in this paper. It shows that effectiveness of calculating large-scale faulte power systems with topology and impedance changes by the modified current sources. 相似文献
15.
In order to meet the performance demands of train lorry, a die forging drawing method based on structure features analysis was proposed to form the L A break beam frame. The finite element method was used to simulate a series of die forging processes and the drawing processes with different parameters. The optimum cross section shape of the performing die was obtained from these simulation results. It is found that local back flow of the metal is the primary cause of necking defects in drawing. Furthermore, the best drawing speed is determined to be from 87 mm/s to 96 mm/s. The results of trial manufacturing and product detection indicate that employing a die forging drawing process to form the monobloc break beam frame is feasible. 相似文献
16.
A temperature-differential drawing process is adopted on the basis of structuredeformation characteristics of austenite stainless steel.With this process,the degree of strainhardening,can be effectively controlled.aging crack be prevented and drawing limit be enhanced,thus the number of drawing operations can be reduced.and intermediate annealing and picklingoperations be eliminated. Therefore,an economic benifit is prominent. 相似文献
17.
The basic phase is selected according to the measured phase diagram, two isothermal sections and two vertical sections of the Al 2O 3-CaO-SiO 2 ternary system are calculated using FACT software. The sections in the same conditions are described through the measured phase diagram. Because of the complexity of this ternary system, there is a large difference between the measured and the calculated phase diagram. It is necessary for FACT to ameliorate the calculation model and perfect the database in calculating oxide system which the interaction is strong. For this kind system, the isothermal section and vertical section should be founded through the experiment result and referencing the calculated phase diagram at the same time. 相似文献
18.
肖旭霖 《农产品加工．学刊》2013,(2):72-75
探讨了工程制图与计算机绘图融合教学改革问题,讨论了融合改革的基本关系与原则,提出了融合教学下理论课与实践训练课程教学体系与内容。以构建适应工程制图与计算机绘图融合教学的新教学体系与模式。 相似文献
19.
为掌握自然崩落法多漏斗放矿属性矿岩流动特性,给出属性随机介质放矿理论基础,从放矿水平布置出发,提炼出高阶段多漏斗放矿仿真模型。采用4块模型、6块模型和9块模型3种概率模型分别考虑不同的放矿端部条件;建立流动颗粒体数据结构和空位传递模型,设计高阶段多漏斗放矿流动数据结构和模拟流程,采用C++面向对象语言和hoops可视化工具包开发模拟程序,在三维可视化环境下得到了不同放矿点间距下多漏斗放矿的矿岩流动特性。根据研究结果,确定放矿底部结构优化参数,为放矿控制和放矿优化提供了参考和依据,并可作为后续放矿计划编制的基础。 相似文献
20.
Hu Yinlia Xu Depei Lu Houyu 《保鲜与加工》1989,(2):73-81
This paper analyzes and proves the seeking for projects of the test bed, the equivalent processing for the bi-electric machine set and the control and loading modts of the test bed. It also introduces briefly the features of the block diagram of the control system and gi.ves the test waveforms. Finely, it points out the problems to be further studied. 相似文献