一种改进的多边形填充算法

提出了一种基于边界标志的多边形填充算法，无须求交，无须乘除法运算，具有较高的运行效果，且填充精确，如果硬化后，其效率将会更高。     

区域填充算法的研究

区域填充算法是计算机图形学的一个重要研究课题.传统的区域填充算法存在填充结果不完备及算法效率不高的问题,在分析了两种传统区域填充算法的原理的基础上,详细阐述了四种改进的区域填充算法,并对算法的效率性能进行比较分析,最后指明了区域填充算法未来的研究热点.     

在小学语文教学中培养学生良好的学习习惯

习惯是由于重复或练习而巩固下来,变成需要的行为方式或倾向.学习习惯同样是人的高级神经活动,是人在学习过程中形成的一系列动力定型. 习惯的核心是独立,无须督促;"是思考,自觉动脑;习惯的表现为自然,随时随地,自律、自动,无须意识的调控,习以为常,自然反映".因此,良好的学习习惯,对于学生学习"自动化",从而激发兴趣,提高能力,发展智力,提高学习效率,有着巨大的作用.     

浅论光栅显示器图形填充算法应用的改进

图形填充技术是图形处理中重要的技术,其相关算法及效率的研究是本领域的热点问题,讨论几种主要的基于光栅显示器的填充算法,并提出了一种对扫描线填充算法的改进。     

关于扫描线种子填充算法的改进

种子填充算法是交互式图示学中常用的区域填充算法,该算法主要是通过栈结构来实现的,简单种子填充算法把太多像素压入堆栈,有些像素甚至会多次重复入栈,这一方面降低了算法的效率,另一方面还要求很大的存贮空间以实现栈结构,解决这个问题的一个办法是改进简单种子填充算法为扫描线种子填充算法,该算法可以避免像素的重复入栈,但在寻找新的种子点时仍会对一些已处理过的扫描线进行检查,这对算法的效率还是会有一定的影响,本文针对这一问题提出一个改进的算法。     

如何提高高考成绩

复习有灵活性，注意效率。比如记忆，根据知识的特点，在记忆和理解之间，可把知识分为三种类型：只需理解无须记忆的；只需记忆无须理解的；只有记忆才能理解的。分清楚各部分性质后，对症下药，不要看到什么都背，尽可以余下时间去巩固!     

花叹人生

无须预约,无须含蓄,花儿在我面前又开了.昔日枯败、凋零的遗憾,随着花开而烟消云散,那些生命的碎片又苏醒了.曾经的缺憾淹没在花开的声音中.……     

医院需要病人

近来,医院的效率越来越高了。病人住院根本无须久等,因为医院的床位过剩。为了经营下去,医院就得尽力避免病床空闲。这似乎是好事,似乎也不是好事。     

医院需要病人

近来．医院的效率越来越高了。病人住院根本无须久等。因为医院的床位过剩。为了经营下去,医院就得尽力避免病床空闲。这既是好事。似乎也不是好事。     

一类低秩矩阵填充问题的快速优化算法

低秩矩阵填充问题是一个秩最小化问题,通常凸松弛为核范数最小化问题来求解.该问题针对有无噪声或有无约束的情形需要分开求解,这使得求解过程变得繁琐.本文建立了一个基于核范数最小化的低秩矩阵填充统一模型,借助临近算子,设计了一种有效且具有收敛性保证的不动点凸优化算法求解该模型.通过对仿真数据和真实数据的数值实验,本文提出的算法与经典的算法相比,在计算效率和精度上都展现出较好的效果.     

液态烃铁路罐车灌装控制系统的开发和应用

分析了液态烃铁路罐车人工灌装精度低、经常超量或短量的原因,提出采用静态轨道衡和质量流量计计量、微机控制灌装,从而实现了自动定量灌装,提高了系统精度等级,避免了超装浪费,提高了铁路调车作业效率和系统安全性,即保证了企业效益,又维护了客户利益.     

南京地区振动沉管灌注桩技术应用实例

振动沉管灌注桩是一种应用较为广泛的桩型。本文以南京新生圩地区某海关查验大楼工程为例,对该类桩的施工程序、操作注意点及有关质量问题的防治措施进行了简单介绍,并对应用中的几个问题进行了探讨。     

Buckling design of large steel silos with various slendernesses

Large steel silos are typical kinds of thin-walled structure which are widely used for storing huge quantities of granular solids in industry and agriculture. In the present analyses, the buckling design of large steel silos subject to Eurocode-specified solid pressure is demonstrated. The finite element model is established using the commercial general purpose computer package ANSYS. Six types of buckling analyses are carried out for the geometrically perfect and imperfect models with and without consideration of material plasticity. The load cases of concentric discharge, discharge patch load, large eccentricity discharge, and large eccentricity filling are considered. The buckling behavior of six example steel silos with capacities of 30 000–60 000 m³ is investigated. The silos’ slenderness ranges from 4.77 to 0.35, comprising very slender, slender, intermediate slender, squat, and retaining silos. The index called the ratio of capacity to steel consumption (RCS) is initially defined in the paper, which provides an effective measure for the economical design of steel silos. It is validated that the RCS index increases rapidly with the decrease of silo slenderness, and the storage efficiency of steel silo improved greatly as the slenderness changes from slender silo to retaining silo. The effects of patch load reveal that the buckling modes in the case of discharge patch load are very different from those of silos under concentric solid pressure, and the effect is unfavorable for buckling resistance of all levels of slenderness of the example silos, but contributes a small decrease to the RCS index (less than 10%). The buckling deformations from both the linear and nonlinear buckling analyses in large eccentric discharge are strongly asymmetrical arising from the circumferential and meridional non-uniform distribution of the solid pressures. The buckling is mainly governed by the non-uniform distribution of the solid pressure other than other influential factors such as the weld imperfection, geometrical and material nonlinearity, compared with the load case of concentric discharge. The RCS index of example silos under large eccentric discharge is reduced substantially, and is approximately half that of silos under concentric discharge. The linear and nonlinear buckling deformations in large eccentric filling are also asymmetrical, deviating from the center to the side where the most friction locates to the highest wall contact. The RCS index of example silos under large eccentric filling is also reduced substantially, and is approximately 70% that of silos under concentric discharge. This reveals that the large eccentricity both in discharging and filling could result in a strong decrease of storage efficiency of steel silos.     

初中物理比例计算技巧初探

初中物理习题的计算往往步骤比较多,但对于填空题和选择题,学生在解答正确的前提下更需要提高解题效率。文章结合教学经验,总结出初中物理比例计算法,并通过具体的教学案例说明比例计算法的应用技巧,同时也指出其局限性,旨在提高学生解题效率和正确率。     

压力雾化喷嘴流场试验研究

雾化喷嘴在工业喷淋塔内起重要作用,雾化的优劣直接影响烟气净化效率和填料表面的利用率。试验采用喷淋强度试验装置,对旋流式压力雾化喷嘴的不同条件下喷淋强度进行了系统研究,探讨了其影响因素,并建立了液雾流场分布函数表达式,为烟气净化中旋流喷嘴的设计提供依据。     

始穗期喷施抗旱剂对地膜旱作水稻后期光合性能及产量的影响

采用大田随机区组设计,研究了始穗期喷施EDTA、黄腐酸、乙酰水杨酸、CaCl2等抗旱性物质对地膜旱作水稻后期光合性能、干物质积累及产量的影响.结果表明:始穗期喷施EDTA、黄腐酸、乙酰水杨酸、CaCl2能延缓叶片衰老,使地膜旱作水稻后期保持较高功能叶面积指数及叶绿素含量,提高光合效率,增加光合产物积累,促进籽粒灌浆,提高产量,其中乙酰水杨酸处理增产最显著,较对照增产达13.8%.     

普采充填工作面充填回采实践

由于朱村煤矿井下有部分薄煤层储量,用炮采吨煤成本较高,2009年采用高档普采,并与矿业大学合作,用膏体充填处理采空区,使剩下的薄层彻底解放出来,并使矿区环境得到改善,工效提高,延长了矿井服务年限。     

电渣重熔2～3吨锭型充填工艺研究

2-3吨电渣锭重熔过程中,将充填工艺分成充填和保温两个阶段,充填阶段再分为平台形成、凸台形成和上端面平滑三个时期。针对各期的填充特点,从充填开始,采用自动控制转入手动,使电流自动归零,然后转入自动控制,功率自动下降,使熔化速度略大于凝固速度,待电流电压降至充填阶段工艺最低点,转入保温阶段的生产工艺,有效地改善了钢锭的充填质量。     

某于Moldflow的座机电话外壳成型仿真分析

为提高模具设计的效率,降低模具制造的成本,以电话座机外壳为研究对象．利用MoldflowMPI6．0系统对制件进行流动一冷却一翘曲分析,得出最佳浇口位置、填充时间、冷却水道温度、翘曲变形等的分析结果,根据分析结果给模具设计工作提出宝贵的建议,设计出可靠的模具。     

Simulation of filling construction of permeable geosynthetic tubes

The filling construction of permeable geosynthetic tubes is considered. First, an analytical approach is developed to determine the internal pressure, tension and shape of the cross section of a geosynthetic tube based on its volume. An analytical solution for the drainage rate of the tube is then derived. The course of the filling construction is divided into several time intervals and the volume of the tube after each interval is obtained from the equilibrium of flow calculated from the drainage rate and filling rate. The validity of our analytical approach is tested by comparing our results with previously published experimental result. The results of this comparison indicate that our method is applicable for simulating the filling construction of permeable geosynthetic tubes.