先进制造系统的生物型模型

采用生物型模型对各种先进制造系统进行描述。文中提出的先进制造系统的生物型模型包括企业基因模型、企业细胞模型、企业生物模型、企业群落模型和企业生态系统模型, 从不同层次描述了各种先进制造系统的内涵、关系及发展方向。     

中浅埋深矩形巷道顶板围岩弹塑性变形

为了分析矩形巷道顶板围岩变形,采用理论推导、数值模拟以及现场监测三者相结合的方法,通过建立矩形巷道顶板梁模型,对该模型进行弹塑性分析,得到巷道顶板围岩表面以及跨中部位沿深度方向不同位置处的下沉量.同时,通过FLAC3D模拟得出在不同埋深(200～700 m)时巷道顶板的下沉量,并将模拟结果与理论计算值以及柠条塔煤矿s1...     

中国明代弹道学史料的考辨与述评

对明代火器文献进行分析,认为学术界关于“中国古代弹道知识是由西方传来”之说值得商榷．中国弹道学知识的形成有其自身的特点,初步形成了能在一定程度上反映火器命中技术发展规律的弹道理论,在中国火器弹道科学思想史上占有重要地位．     

群上亚同态的一个必要条件及由此引出的一些性质

给出了群上亚同态的一个必要条件,又由这一必要条件给出了群上亚同态的一些性质.     

改性油页岩渣-粉煤灰二元复掺的水化特征

中国油页岩储量大,化学成分中硅铝含量虽然极高但火山灰活性却很低,作为掺合料替代水泥掺量局限于20%以下。为提高油页岩渣活性和掺量,以600℃煅烧2 h为活化基础,辅以高钙粉煤灰提供水硬性,复合掺量设置为30%,结合X射线衍射(X-rays diffraction, XRD)、扫描电子显微镜(scanning electron microscope, SEM)、能谱仪(energy dispersive spectrometer, EDS)与傅里叶红外光谱仪(Fourier transform infrared spectrometer, FTIR)的检测手段,探究复掺体系水化过程中水化产物的种类、形貌以及硅铝比。结果表明,改性油页岩渣活性源于脱油、脱水、脱羟基增大比表面积以及破坏油页岩渣中高岭土晶体从而产生的无定形铝硅酸盐物质;7 d活性指数达到97.4%,28 d活性指数达到85.8%;水化过程中改性油页岩渣先参与二次水化反应,Ca(OH)₂充足的前提下粉煤灰接着发生三次水化反应,若Ca(OH)₂不充足,粉煤灰以内核的角色参与二次水化反应;...     

Breaking the Monolith: Strategy,Variety, and Performance of Enterprise Information Systems

This paper intends to understand the form of implementations of Enterprise Information Systems (EISs). EISs are usually provided as packaged software products. Due to the diversities of implementations, EISs are often characterized by their system architectures. A conceptual framework is proposed to delineate the diversity and dynamics of EIS implementations. This framework is constituted of three components, EIS strategy, variety, and process-level performance (SVP). In particular, the variety of implementations is defined by two constructs, application scope and application depth. A Partial Least Squares structural equation modeling approach is applied to test the hypotheses according to the survey data from 223 project reports of EIS implementations in China. The results show that the EIS strategy and variety can both affect the performance of the implemented EISs. Specifically, application depth has an important mediating effect on the relationship between EIS strategy and performance. EIS strategy and application depth are breakthrough points to improve the performance of the implemented EISs. These findings suggest that the variety plays a central and effective role in the analysis of EIS implementations. This SVP framework highlights the interconnections among its components and captures the form of EIS implementations.     

Research on Complementarity and Similarity of Technology Convergence北大核心CSCD

Exploring complementary technology convergence and similar technology convergence is conducive to enhancing enterprise innovation capability. This paper analyzes the impact of partner diversity on technology convergence by building a multi-layer network model of organizational cooperation and technology convergence. The research shows that the geographic diversity of partners is not conducive to the occurrence of complementary technology convergence and similar technology convergence. The technological diversity of partners is conducive to complementary technology convergence but not conducive to similar technology convergence. The relationship strength between enterprises and different types of partners has different effects on complementary technology convergence and similar technology convergence. The research results can help enterprises choose appropriate partners to achieve different innovation strategies. © 2023 Editorial Borad of Complex Systems and Complexity Science. All rights reserved.     

一种新的虚拟卷尺测量交互仿真方法

虚拟卷尺测量是工业培训系统中重要的工序,其交互仿真的逼真度主要取决于抓取的稳定性和卷尺建模的精确性。结合虚拟手,提出一种新的虚拟卷尺测量交互仿真方法,并应用到风力发电机对中培训仿真系统中。通过融合几何规则和物理规则改进抓取判断方法,并利用四元数调整抓取姿态。在三维Bresenham算法的基础上,通过优化顶点设置解决宽度不均等问题,实现虚拟尺条的平滑伸缩。实验结果表明,该方法是有效的,抓取准确自然,卷尺仿真逼真,能够大大提高虚拟培训效果。     

地下矿连续开采技术的应用

采场出矿运矿连续作业，是近年来我国在连续工艺技术研究领域中所取得的重大成果之一。本文主要介绍其连续工艺的技术要点，以及机组设备的结构特征与工业应用情况。     

城市车辆集中使用模式

城市车辆集中使用模式顾守怀，李引真（兰州铁道学院管理系，７３００７０）ＡＭｏｄｅｌｏｆＳｃｈｅｄｕｌｉｎｇＴｒｕｃｋＲｏｕｔｅｓｉｎａＣｉｔｙＧｕＳｈｏｕｈｕａｉＬｉＹｉｎｚｈｅｎ（ＬａｎｚｂｏｕＲａｉｌｗａｙＩｎｓｔｉｔｕｔｅ）ＡｂｓｔｒａｃｔＩｎ...