上海梅山钢铁股份有限公司干熄焦电气控制系统

上海梅山钢铁股份有限公司干熄焦项目为1、2。焦炉移地大修的配套项目。该项目包括新建l套140t／h干熄焦装置及1座6MW的背压式汽轮发电机电站。其相应的配套设施有提升机装置、CDQ工艺除尘及环境除尘地面站、除盐水站、循环水站等。该项目应用了国内外先进的工业自动化控制技术和变频调速传动技术,其电气控制系统在国内属于领先水平,实现了干熄焦操作的自动化控制。     

螯合态微量元素桉树专用肥对桉树的促生效果

对"中化"牌螯合态微量元素按树专用肥促进林木生长的效果进行综合评价.通过几种肥料的对比试验表明:"中化"牌螫合态微量元素按树专用肥对桉树有明显的促生作用.施用该专用肥,按树长势旺盛,成活率高,树形整齐,树干通直匀称.螯合态微量元素桉树专用肥是理想的按树专用肥,值得在桉树上推广使用.     

固体石蜡作粘合剂的纯碳糊电极在流动注射分析中的应用

本文以固体石蜡作粘合剂的纯碳糊电极在流动注射分析中用电流法直接测定色氨酸，以HAc-NaAc(pH=3.5)缓冲液作载流液，选择电位1．4V,测定电流，峰高与被测物在一定浓度范围内成线形关系，实验测定了色氨酸的工作曲线，并讨论了各条件对结果的影响。     

Preparation and performance of poly(lactic acid)/amidated ammonium citrate intercalated saponite nanocomposites

ABSTRACT

In this article, a novel method, amidation, was used to modify saponite. Amidated ammonium citrate intercalated saponite (Aa-saponite) was synthesized by amidation reaction. The structure of Aa-saponite was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), demonstrating that the saponite was successfully amidated. Polylactic acid/amidated ammonium citrate intercalated saponite nanocomposites (PLA/Aa-saponite) were prepared by melt blending. Mechanical tests demonstrated that the addition of Aa-saponite (0.3 wt%) improved the impact strength of PLA. A series of performance analysis results showed that A-saponite improved the comprehensive performance of PLA, such as mechanical, thermal stability, crystallization and rheological properties.     

一种新型轮胎硫化机中心机构工作性能的模拟研究

中心机构是轮胎定型硫化机的重要部件,目前现有轮胎定型硫化机的进水口和出水口平行设置在中心机构的底部,当过热水充满整个胶囊后开始在胶囊里进行循环时,位于中心机构底部位置的过热水不能充分地与顶端的液体进行热量置换就流出胶囊,造成轮胎胎侧上下两端温差较大,整个胶囊内的热交换效率低下,轮胎硫化不均匀。因此,本文提出一种新型轮盼定型硫化机中心机构,并且详细阐述其作用机理,利用FLUENT模拟软件与现有的轮胎定型硫化机中心机构的工作性能进行比较,以更好地说明其能够明显改善轮胎的硫化效果。     

Resistive viscoelasticity of silicone rubber/carbon black composite

Electrical conductive polymer composites are shown as prospective flexible pressure and stretch sensors for detecting the dangerous deformations and for sensing the pressure with minimal intrusion. To better understand the piezoresistive mechanism and improve the performance of this type of sensor, a series of experiments were conducted to investigate the resistive viscoelasticity of silicone rubber/carbon black composite film. First, the flexible conductive composite film was composed with liquid silicone rubber as the matrix and conductive carbon black as the filler. The filler loading was fixed at 5 phr in mass ratio. Then, the resistive viscoelasticity of the composite film was studied as a function of frequency in the range from DC to 1 MHz, including resistive creep, resistive relaxation, and resistive recovery, although in a standard experiment, one‐step stress or one‐step strain was loaded in transient time and the resistance responses were measured. Result from the experiment shows that the creep of resistance is composed of two distinct segments. One is coincident with the strain creep of a typical viscoelastic material, while the other is quite different. Both the relaxation and the recovery of resistance exhibit strong frequency dependence. The relaxation speed becomes slower with the increase of exciting frequency except DC, and the relaxation speed is marginal when excited by DC electrical field. The recovery time becomes shorter with the increase of the exciting frequency. POLYM. COMPOS., 32:29–35, 2011. © 2010 Society of Plastics Engineers     

基于RFID的监狱智能定位系统的设计与实现

为解决在押犯人管理困难的问题,该文介绍了一种基于射频识别技术的CC1110 RSSI定位系统。系统主要由腕带标签、读卡器、无线中继和服务器组成。标签主要负责对读卡器发送相关信息,读卡器负责接收标签的数据并转发给无线中继,中继通过以太网把读卡器传送过来的数据发送给服务器,服务器负责对数据的处理、分析并进行相关管理操作。该系统结构简单、硬件成本较低、易部署、适应性较强。实际测试表明,该系统能够用于监狱在押人员的定位,降低非视距误差。     

Evaluation of apatite-coated chitosan microspheres for bone regeneration

The apatite-coated chitosan microspheres were fabricated by incubating chitosan in five times simulated body fluid. The apatite deposited on the microspheres was similar to natural bone mineral, as demonstrated by scanning electron microscopy, X-ray diffraction spectra and Fourier transformed-infrared spectroscopy analyses. Rat bone marrow-derived mesenchymal stem cells （BMSCs） were seeded on apatite- coated microspheres to investigate the effect of this scaffold on cell proliferation and differentiation. BMSCs seeded on uncoated microspheres were served as a control. In vivo experiment was evaluated by transplanting the microspheres loaded with or without BMSCs in 5-mm cranial defects of Wistar rats. Bone regeneration was investigated via micro-CT and histological analysis. It was found that apatite-coated chitosan microspheres could significantly promote the proliferation and alkaline phosphatase activity of BMSCs compared with uncoated microspheres. Histological slices and Micro-CT images at 8 weeks revealed much better regeneration of bone in the apatite-coated microspheres loaded with BMSCs than the control. In addition, the defect filled with pure microspheres induced little new bone formation. Our findings suggest that the apatite-coated chitosan microspheres scaffold is a promising carrier of stem cells for cranial bone tissue engineering.     

A review of heavy-duty legged robots

Heavy-duty legged robots have been regarded as one of the important developments in the field of legged robots because of their high payload-total mass ratio, terrain adaptability, and multitasking. The problems associated with the development and use of heavy-duty legged robots have motivated researchers to conduct many important studies, covering topics related to the mechanical structure, force distribution, control strategy, energy efficiency, etc. Overall, heavy-duty legged robots have three main characteristics: greater body masses, larger body sizes, and higher payload-total mass ratios. Thus, various heavy-duty legged robots and their performances are reviewed here. This review presents the current developments with regard to heavy-duty legged robots. Also, the main characteristics of high-performance heavy-duty legged robots are determined and conclusions are drawn. Furthermore, the current research of key techniques of heavy-duty legged robots, including the mechanical structure, force distribution, control method, and power source, is described. To assess the transportation capacity of heavy-duty legged robots, performance evaluation parameters are proposed. Finally, problems that need further research are addressed.