浅谈皮带定量给料机的机械配置选型

皮带定量给料机是目前水泥生产企业中最为常见的过程计量和配料的设备。作者结合多年来开发、调试和使用皮带定量给料机的实践经验与资料积累，介绍了如何根据实际需要和使用量程，通过对皮带定量给料机的主要机械参数的计算来合理地选用定量给料机的型号和规格。     

二烷基二硫代氨基甲酸镉的合成及应用研究

合成了润滑油添加剂二戊基二硫代氨基甲酸镉,利用四球试验机研究了其在矿物基础油中的极压、抗磨性能,以及与二烷基二硫代磷酸锌(T202)有机硼酸酯和磷酸三苯酯添加剂之间的抗磨协同性能。结果表明,此添加剂体现出了较好的抗磨性能和承载能力,并且与两种硼酸酯都体现出了良好的抗磨协同性能。另外,通过箱热氧化试验简单评价了其抗氧化性能,结果表明,该添加剂具有良好的高温抗氧化性能。     

计算机网络安全与防范

网络安全已经成为了社会热点问题之一.针对网络的安全性和可靠性等问题,从计算机网络安全的定义、存在的问题和防范措施等方面入手,提出了一些看法.只有真正提升网络安全的防范能力,建设安全、稳定的计算机系统,才能满足个人和社会对网络的需要,从而实现安全利用计算机网络信息的目标.     

瞄准新目标、全面提升江西省陶瓷自主创新能力和生产力

立足于国内主要产瓷区调研,在分析论证的基础上,寻找出和兄弟省份先进产瓷区的主要差距。并提出:必须瞄准新目标,选好“十一五期间”陶瓷主攻方向和重点科技攻关项目,把解决陶瓷产业和经济增效的瓶颈制约放在优先位置。“四轮驱动”快速全面提升江西省陶瓷自主创新能力和生产力。     

浅谈C语言中循环结构的教学--回答好循环结构的“三个问题”

循环结构是C语言程序设计中的重难点,其掌握情况对于后续章节的学习效果尤为关键。本文以什么是循环、何时需要使用循环以及如何使用循环三个问题为主线,通过精心选择的教学案例和灵活有效的教学方法来进行解答,以激发学生兴趣,培养编程思想。     

空客飞机编码译码组件DEU B故障分析与系统优化

针对机龄较长的A320飞机多次重复出现DEU B或DEU B 300 RH等故障信息,难以排除故障,本文将研究空客排故手册TSM和图解目录手册IPC中的排故信息,以及编码译码计算机软件和硬件的情况,判断故障的原因,彻底解决这一故障,提高航空器的可靠性,控制维修成本。最终,在大量研究之后,发现是编码译码计算机在互换性和混装性方面出了问题,并经过系统设备优化升级、手册修改等措施,取得了预期的效果。     

聚乙烯电缆料的高速挤出技术

研究了聚乙烯绝缘料的高速挤出特性。结果表明：通过共混改性，添加合理的助剂及良好的工艺条件能较好地实现PE电缆绝缘料的高速挤出。     

Adaptive Lipschitz Observer Design for a Mammalian Model

This paper deals with observer designs for a proposed mathematical model of circadian rhythms which exist in almost every living organism. A 7th order model for mammalian circadian rhythms which captures the main dynamic features is considered in this paper. A recent result of one‐sided Lipschitz observer design in the literature is applied to this mammalian model to show a possibility of reducing measurements for circadian models in system biology. The mammalian model presented may contain an uncertainty parameter. An adaptive design of the Lipschitz observer is then applied to deal with this case. Besides detailed designs of both observers, detailed analysis is also performed for nonlinear functions in the mammalian model to show that the Lipschitz observers can indeed be applied. Several simulation studies of the proposed observers are carried out with the results shown in this paper.     

The topological basis realization and the corresponding Heisenberg model of spin-1 chain

In this paper, it is shown that the Heisenberg model of spin-1 chain can be constructed from the Birman–Wenzl algebra generator while we have got that the Heisenberg model of spin- $\frac{1}{2}$ chain can be constructed from the Temperley–Lieb algebra generator in our previous work (Sun et al. in EPL 94:50001, 2011). Here, we investigate the topological space, we find that the number of topological basis states raise from the previous two to three, and they are also the three eigenstates of a closed four-qubit Heisenberg model of spin-1 chain. Specifically, all the topological basis states are also the spin single states and one of them is the energy single state of the system. It is worth noting that all conclusions we get in this paper are consistent with our previous work (Sun et al. in EPL 94:50001, 2011). These just indicate that the topological basis states have particular properties in the system.     

On-chip fabrication of magnetic alginate hydrogel microfibers by multilayered pneumatic microvalves

Alginate hydrogel has widespread applications in tissue engineering, cancer therapy, wound management and drug/cell/growth factor delivery due to its biocompatibility, hydrated environment and desirable viscoelastic properties. However, the lack of controllability is still an obstacle for utilizing it in the fabrication of 3D tissue constructs and accurate targeting in mass delivery. Here, we proposed a new method for achieving magnetic alginate hydrogel microfibers by dispersing magnetic nanoparticles in alginate solution and solidifying the magnetic alginate into hydrogel fiber inside microfluidic devices. The microfluidic devices have multilayered pneumatic microvalves with hemicylindrical channels to fully stop the fluids. In the experiments, the magnetic nanoparticles and the alginate solution were mixed and formed a uniform suspension. No aggregation of magnetic nanoparticles was found, which is crucial for flow control inside microfluidic devices. By regulating the flow rates of different solutions with the microvalves inside the microfluidic device, magnetic hydrogel fibers and nonmagnetic hydrogel fibers were fabricated with controlled sizes. The proposed method for fabricating magnetic hydrogel fiber holds great potential for engineering 3D tissue constructs with complex architectures and active drug release.