考虑现金短缺的最佳现金持存量模型

企业在应用存货模式确定最佳现金持存量时,由于该方法假设"不允许资金短缺",而现实中的企业往往允许一定量的资金短缺,从而限制了该方法的实用性,通过对存货模式进行改进,建立了可取代存货模式的允许现金短缺的模型,该模型具有更广泛的适用性.     

夹具概念设计中功能推导的研究

介绍了夹具自动设计中概念设计的必要性 ,提出了夹具概念设计的方法 ,给出了夹具概念设计中的功能推导的基本思路及具体实现     

基于网络的协同服装款式结构CAD系统的架构设计

以智能服装款式结构CAD系统为工程背景，以计算机支持的协同设计（CSCD）理论为核心，提出了一套综合高效的设计、开发、应用模型，并利用当前技术加以实现，使得网络化的在线协同智能款式设计成为可能。     

交际活动在英语课堂教学中的应用

结合大学英语教学的基本要求,在以培养学生交际能力为核心的交际教学法指导下,讨论了英语教学过程中所运用的课堂交际活动--讨论、扮演角色、模拟三种主要形式及面临的主要难题.     

链式实验项目可强化学生综合运用专业知识的能力

本文介绍链式实验项目的含义,并在机电一体化专业中首次推行,收到了良好效果,对学生综合应用知识的能力是一个很好的强化与训练,可激发学生创新意识与创新思维,在实验教学方面进行了有益尝试,具有广泛的推广价值.     

MPEG-7压缩算法在校园网中的应用

MPEG_7标准定位于提供一组广泛的音频视频描述工具 ,来创造描述信息。这些信息意味着优秀的存储方案、高效的内容识别、快速、智能、精确并个性化的过滤、搜寻和检索。在分析MPEG_7标准的基础上 ,对其在校园网的应用上做了进一步的探索     

不同作物根系对黑土碳组分及其含量的影响

以黑龙江省寒地黑土为研究对象,通过室内培养试验研究了大豆、玉米、甜菜根系对土壤呼吸释放CO2量、水溶性有机碳、微生物量碳和土壤有机碳含量变化的影响.结果表明:大豆、玉米、甜菜根系普遍提高土壤有机碳含量,但是不同作物根系及根系施用量之间还存在一定的差异,大豆根系要好于玉米根系,而玉米根系明显好于甜菜根系.玉米、大豆、甜菜...     

Woolen Textile Simulation by Synthesis Mapping

This paper proposes a new rapid and efficient method for woolen textile simulation-Cmapping synthesize. This method uses a stochastic function to simulate fuzz on some types of wool textile. The wool yarns are simulated on the basis of Phong illumination model. In order to obtain a visual effect of the wool textile with fuzz, the light intensity of fuzz is synthesized as a color parameter in the Phong illumination model after the yarns have been simulated. The model of woolen textile with fuzz can be built eventually. With synthesis mapping methods, user can choose his favorite fuzz density on the wool by controlling some appropriate parameters.     

PUMA560机构的运动学性能分析

对串联PUMA560机构的运动学性能进行了分析，分别绘出了速度、加速度的性能图谱，从而为该机构的尺寸设计提供理论依据。     

Fluxes of CO2, N2O and CH4 from a typical temperate grassland in Inner Mongolia and its daily variation

Using a dark enclosed chamber technique, the fluxes of CO2, N2O and CH4 from nature and disturbed grassland were measured on the spot in Inner Mongolian Temperate Grassland along the annual rainfall gradient section ranging from 450 to 200 mm. The results showed that the measured mean fluxes of CO2, N2O and CH4 were (1 180.4 ± 308.7), (0.010 ± 0.004) and (- 0.039 ± 0.016) mg·m?2/h, respectively. The decrease of the fluxes of CO2, N2O and CH4 follows with that of annual rainfall gradient in the measurement area. Human activities, such as grazing and reclamation are also critical factors to affect the fluxes of these gases from grassland. Daily continuous measurement of CO2, N2O and CH4 fluxes showed a strong diurnal variation with higher emission in the daytime. A good relationship between the fluxes of CO2, N2O, CH4 and temperature was exposed in this study.