非水溶液酸碱滴定分析及在TDI生产控制中的应用

主要从非水溶液酸碱滴定的原理、本质上进行简要介绍,并结合在TID生产控制分析的应用进行了说明。     

过F108-1断层多种支护技术联合应用与实践

介绍了顾桥矿南翼胶带机大巷(二),过F108-1正断层掘进中,采用工作面超前注浆和滞后注浆两种注浆工艺,锚网索主动支护,U型棚刚性支护及注浆锚索加固支护3种支护相结合的方式,通过优化施工方案,合理组织劳动施工,确保顾桥矿生产接替,减少巷道维修量,提高巷道使用寿命,取得良好的技术经济效益。     

可控电抗器应用于内蒙古500 kV电网中的可行性分析

可控电抗器具有简化无功控制措施、减低系统有功损耗等优点。结合内蒙古电网2011年运行方式,利用潮流计算仿真软件,对可控电抗器应用于内蒙古500 kV电网中的配置方案以及节能降损等问题进行探讨。同时,对配置方案进行了电压调整效果分析、经济性分析及N-1开断模拟分析,讨论配置方案的可行性,并给出建议。最后,得出可控电抗器应用于内蒙古500 kV电网是可行的结论。     

叉指型微电极交流电渗泵的阻抗谱分析

阻抗谱的研究对于优化交流电渗泵的结构具有重要意义。通过分析交流电渗泵的结构和工作原理,指出双电层的电容特性和电解质溶液的电阻特性,建立了用来研究交流电渗泵阻抗谱的RC等效电路。在最佳电极结构参数设置下,得到了不同频率下的阻抗谱,分析了电极周期长度以及通道高度改变对交流电渗泵阻抗模以及幅角的影响,并对电解质溶液浓度对阻抗谱的影响做了估计。结果表明,工作频率的增加总体上会造成阻抗模的增大和阻抗角的减小,而同一频率下不同因素对阻抗谱的影响又有所不同。该结论对交流电渗泵的设计和功耗研究有一定的理论指导意义。     

Efficient parallel PML algorithms for truncating finite difference time domain simulations

In this paper, the parallel implementation of the stretched coordinate perfectly matched layer (SC-PML) and the wave equation PML (WE-PML) formulations is presented for truncating three-dimensional (3-D) finite difference time domain (FDTD) grids. In the proposed parallel algorithms, the FDTD computational domain is divided into contiguous non-overlapping subdomains using two-dimensional topology and the interprocessor communications between the neighboring subdomains are carried out by using the message passing interface (MPI) system. The performance of the proposed parallel algorithms has been studied by using a point source radiating in 3-D domains and performed on a network of PCs interconnected with Ethernet. It has been observed that the WE-PML parallel algorithm is approximately 2.3 faster than the SC-PML parallel algorithm.     

Parallel programming on a high‐performance application‐runtime

High‐performance application development remains challenging, particularly for scientists making the transition to a heterogeneous grid environment. In general areas of computing, virtual environments such as Java and .Net have proved to be successful in fostering application development, allowing users to target and compile to a single environment, rather than a range of platforms, instruction sets and libraries. However, existing runtime environments are focused on business and desktop computing and they do not support the necessary high‐performance computing (HPC) abstractions required by e‐Scientists. Our work is focused on developing an application‐runtime that can support these services natively. The result is a new approach to the development of an application‐runtime for HPC: the Motor system has been developed by integrating a high‐performance communication library directly within a virtual machine. The Motor message passing library is integrated alongside and in cooperation with other runtime libraries and services while retaining a strong message passing performance. As a result, the application developer is provided with a common environment for HPC application development. This environment supports both procedural languages, such as C, and modern object‐oriented languages, such as C#. This paper describes the unique Motor architecture, presents its implementation and demonstrates its performance and use. Copyright © 2008 John Wiley & Sons, Ltd.     

注塑模设计中冷、热流道技术在Moldflow中的比较分析

以Moldflow软件为分析平台,以电器过线板的模具设计为例,首先分析了塑件结构的工艺性,然后采用冷、热流道技术进行塑件成型分析。对比两种技术的CAE参数,从结果可知,在注射模具设计中应用热流道技术可采用较低充填熔体温度,显著降低熔体聚合物分解的风险,同时采用热流道技术可以降低因困气和温差导致的气穴和熔接痕的可能性,同时也可减少冷却时间极大地提高了模具生产的效率。整个分析结果在一定程度上为热流道技术在注塑模具设计中的广泛应用提供了理论支持。     

The digital public humanities: giving new arguments and new ways to argue

ABSTRACT

In response to the latest “crisis” in the humanities, advocates have marched, rallied, fundraised, and—especially—argued. This essay contends that communication scholars can support the growing “case for the humanities” by analyzing argumentative strategies, and more specifically, by offering ethical argumentative strategies that avoid replicating structures of domination. In particular, we look to Mari Lee Mifsud's theorization of rhetoric as gift, which follows Henry W. Johnstone in conceptualizing argument as something other than winning over an adversary. We place Mifsud's theorization of the gift in conversation with the methods of the digital public humanities (DPH), which acknowledge and offer abundant resources for meaning-making. Through the methods of DPH, we offer a response to the humanities “crisis” that activates the humanities’ already broad constituencies by giving resources for humanistic inquiry rather than seeking to capture adversaries. Our case study is Photogrammar, a DPH project for organizing, searching, and visualizing the New Deal and World War II era photographs funded by the U.S. federal government. The project forefronts visual, nonlinear, and interactive argumentation in order to engage publics in generative humanistic inquiry. By enlisting participants and sharing expertise, Photogrammar shows how humanities advocates can deepen attachments to the humanities and build broad constituencies of collaborators and allies.     

Using discussion logic in analyzing online group discussions: A text mining approach

We propose a Discussion Logic-based Text Analytics (DiLTA) framework, which combines theories developed in social science and text mining fields. The framework extracts features that uncover discussion logic and uses these features in analyzing online discussions. A series of models are proposed including conversation disentanglement, coherence analysis, and visualization. Validation experiments showed that DiLTA achieved significantly superior performance over existing text analytics methods in reconstructing internal structure. A case study using DiLTA-enabled visualization on a healthcare forum illustrates the great potential of DiLTA in assisting comprehension of the internal linkage, structure, and logic of online group discussions.     

热轧无缝钢管生产中直通式电磁感应加热炉的工艺设计及应用

简述了电磁感应加热方式应用于热轧无缝钢管生产中荒管再加热的优越性。结合应用实例提出了直通式电磁感应加热炉的工艺设计要点及系统自动控制的组成,并针对其应用中可能存在的问题提出了解决办法。