煤矿用手持类回转钻机安全转矩问题的分析与探讨

针对我国煤矿用手持类回转钻机的安全转矩问题进行了分析与讨论,提出了安全转矩、转矩安全因数及其许用值等基本概念,分析了手持式钻机、支腿式锚杆钻机等典型手持类回转钻机的转矩安全因数的计算方法以及许用值的确定,对如何控制煤矿用手持类回转钻机的安全转矩提出了建议。     

ZYW-2000型钻机夹持器的设计

为了提高煤矿瓦斯抽放孔钻进过程中起、下钻具的效率与安全性,结合ZYW-2000型煤矿全液压联动钻机研制项目,在传统常闭式夹持器的结构特点与用途的基础上,设计了一种新型的碟簧夹紧与液压开、夹相结合的复合式常闭夹持器,并对其结构、工作原理及主要设计参数的计算过程做了介绍。     

UPTIME: an IMS-based mobility framework for next generation mobile networks

Seamless inter-technology mobility is one of the fundamental requirements of next generation mobile networks. For seamless mobility, handover delay and packet loss should be minimized. However, existing solutions suffer from a number of shortcomings in satisfying these requirements: first, handover preparation schemes fail to minimize the handover delay as much as possible. Second, minimizing packet loss which is usually using soft handover (SHO) schemes are excessively wasteful of scarce resources. In this paper, we propose the uninterrupted proactive connection transfer for IMS mobility enhancement (UPTIME) mobility framework which achieves seamless mobility while minimizing excessive power and radio resource consumption. UPTIME incorporates two mechanisms; a proactive handover preparation method and an optimized SHO technique for handover execution. We demonstrate the benefits of the proposed framework through both analysis and simulation. Our simulation results for typical LTE/WiMAX handovers show that the handover preparation delay can be reduced by 70 %, and good packet loss performance can be achieved whilst saving 43 % of radio resources and 48 % of battery power.     

回收乳化液中的蜡油新工艺

介绍了氧化沥青尾气利用冷却水吸附冷却，回收高质量乳化油的新工艺，达到将乳化油净化为回炼的蜡油的目的，以此来提高沥青的附加值，经过两年多的实际应用，效果很好。     

电力系统的电压控制与安全经济运行

本文讲述了电力系统电压控制的必要性、复杂性,以及电压控制与电力系统安全经济运行的关系及如何控制电压和需要注意的问题。     

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油田化学专用技术的核心是各种功能的油田化学药剂和由此形成的多系列的油田化学工作液体系。而油田化学药剂是油气田勘探、开发、生产和输运等过程中必须的化学物质，它的功能和质量直接影响着钻井质量、采收率和油气生产综合开发成本。油田化学药剂的创新离不开油田化学作用机理研究的创新、突破与发展，文章以滤失控制变粘酸酸液体系配方技术、高粘型W/O自动破乳乳化酸酸液体系配方技术、低粘型W/O自动破乳乳化酸酸液体系配方技术、自动防乳破乳胶束酸酸液体系配方技术、无聚合物自转向酸液体系配方技术、EOR采油用疏水缔合聚合物体系配方技术、缓释放技术在油田化学工作液体系配方技术和两性离子聚合物钻井液体系配方技术等方面的油田化学新作用机理研究的创新突破与发现为例，论述了油田化学新作用机理研究与发现对油田化学专用技术创新应用的贡献。     

Wireless communication in a flip-chip package using integrated antennas on silicon substrates

An intrachip wireless interconnect using integrated antennas is demonstrated in a flip-chip ball grid array package. The wireless interconnect consists of a transmitter-receiver pair, which is fabricated in a 0.18-/spl mu/m CMOS process. A 15-GHz signal is generated and broadcasted across the integrated circuit. The signal is picked up by a receiver 4 mm away on the same integrated circuit and frequency divided by eight to produce a 1.875-GHz local clock signal. The interconnection is also demonstrated between a transmitting antenna and a packaged receiver 40 cm away from the transmitting antenna. Demonstration of intrachip wireless interconnects in a package has been considered the ultimate test for this technology.     

用局部傅里叶变换进行图像融合

本文种基于局部傅里叶交换通过比较图像局部频谱中谐波系数进行图像副合的方法,这是一种算法简单,物理意义明确的图像融合方法,实验表明这种方法对不同聚集图像的融合特别有效,文中给出了这类图像融合的实验结果,结果表明本文的方法远优于直接取均值融合,也优于用小波分解的融合方法。     

磁性载体记录的稳定性探索

本文总结了有关贮存在各种磁性记录载体中信息的保存性的一些基本科学技术知识，包括：录音带，录像带，计算机磁带，软磁盘，硬磁盘，光磁盘等，全文分两期登出，本期登其第一部分，内容主要为：磁性记录材料的特性和稳定性，磁性粒子，下期内容为：粘合剂，聚酯带基，环境因素影响等。