基于VB的计算机与变频器的通讯技术研究

在介绍富士变频器FRENIC5000G11S/P11S的串行通讯功能的基础上,探讨了计算机控制变频器的串行通讯方法,并利用VB语言编写通讯程序,实现变频器的计算机远程控制。     

Zn(II) Complex Catalyzed Coupling Aquathermolysis of Water-Heavy Oil-Methanol at Low Temperature

A Zn(II) coordination complex was synthesized, characterized, and used for catalytic aquathermolysis of heavy oil at low temperatures for the first time. The effects of water content and catalyst concentration on aquathermolysis were investigated. And then a tri-component coupling aquathermolysis of waterheavy oil-methanol was designed and the reaction conditions were investigated. With the catalyst and methanol, the reaction occurred at temperatures as low as 180°C. The viscosity of the product was also substantially reduced from around 24 400 to 6420 mPa s by the decomposition of the large hydrocarbon molecules.     

白钨浮选尾矿回收萤石低温浮选试验研究

针对某地白钨浮选尾矿进行萤石低温浮选回收,在矿浆温度为12℃的条件下,试验室小型闭路试验获得的指标为:萤石浮选给矿CaF2含量为24.53%,CaCO3含量为6.25%;萤石精矿中CaF2含量为95.12%,回收率为58.07%,CaCO3含量为0.44%。在萤石浮选给矿CaF2含量为22.34%的条件下,工业试验获得萤石精矿中CaF2含量为93.70%,回收率为38.10%,CaCO3含量为1.40%。     

Novel antibacterial modalities against methicillin resistant Staphylococcus aureus derived from plants

Abstract

Methicillin-resistant Staphylococcus aureus (MRSA) is a notorious bacterial pathogen that induces high mortality and morbidity. Due to the emergence of multiple resistance, antibiotic treatments are rapidly becoming ineffective for the related infections. Natural products, especially those derived from plants, have been proven to be effective agents with unique antibacterial properties through different mechanisms. This review interprets the resistance mechanisms of MRSA with the aim to conquer public health threat. Further, recent researches about plant antimicrobials that showed remarkable antibacterial activity against MRSA are recorded, including the crude plant extracts and purified plant-derived bioactive compounds. Novel anti-MRSA modalities of plant antimicrobials such as alteration in efflux pump, inhibition of pyruvate kinase, and disturbance of quorum sensing in MRSA are also summarized which may be promising alternatives to antibacterial drug development in future.     

基于DEMATEL-ISM的食品安全治理公众参与能力指标研究

目的构建食品安全治理公众参与能力指标体系,揭示食品安全治理公众参与能力指标之间的相关关系和层级结构。方法运用文献研究和专家调查法构建食品安全治理公众参与能力指标体系,采用DEMATEL-ISM方法研究食品安全治理公众参与能力指标之间的相关关系和层级结构。结果在12个二级指标中有4个指标为重要因素;原因因素包含4个指标,结果因素包含8个指标;食品安全治理公众参与能力指标可划分为3个层级,其中直接层包含参与意识等6个指标,中间层包含法律知识等4个指标,基础层包含食品安全知识等2个指标。结论食品安全治理公众参与能力指标之间存在相互作用关系和典型的层级结构,在加强公众参与能力建设时,应充分考虑指标之间的相互作用关系和层级结构。     

Synthesis,characterization and catalytic methanation performance of modified kaolin-supported Ni-based catalysts

Kaolin as a raw material for mesoporous support was firstly modified by calcination, acid treatment, and then was used to prepare nickel catalysts. The amount of alumina which was activated in kaolin during thermal treatment and then leached out in the acid was different. XRD pattern of the kaolin calcined at 600℃ or 900℃ exhibited only the diffraction peaks for amorphous silica and quartz while that calcined at 1100℃ showed obvious peaks for γ-Al₂O₃. Therefore, the nickel-based catalysts exhibited different physic-chemical properties. Atmospheric syngas methanation over the catalysts clarified an activity order of CA-1100 > CA-900 > CA-1400 > CA-600 > KA ≈ 0 at temperatures of 350-650℃ and a space velocity of 120 L·g^-1·h^-1. Metallic nickel with small diameter which has medium interaction with the modified kaolin and is well dispersed on the support would have reasonably good activity and carbon-resistance for syngas methanation.     

Applications of high-gravity technologies in gas purifications: A review

The traditional gas purification techniques such as wet gas desulfurization, with their advantages of large-scale implementation and maturity, have still been widely used. However, the main drawback of these techniques is the low transfer efficiency, which normally needs towers as tall as tens of meters to remove the pollutants. Therefore, new technologies which could enhance the mass transfer efficiency and are less energy-intensive are highly desirable. As a process intensification technology, high-gravity technology, which is carried out in a rotating packed bed(RPB), has recently demonstrated great potential for industrial applications due to its high mass transfer efficiency, energy-saving, and smaller volume. This consequently provides higher efficiency in toxic gas removal, and can significantly reduce the investment and operation costs. In this review, the mechanism,characteristics, recent developments, and the industry applications of high-gravity technologies in gas purifications, such as hydrogen sulfide, nitrogen oxide, carbon dioxide, sulfur dioxide, volatile organic compounds and nanoparticle removal are discussed, most of the demonstration projects and practical application examples in gas purification come from China. The perspective and prospective of this technology in gas purification and other fields are also briefly discussed.     

碳四烯烃制丙烯催化剂及其工业应用

研究碳四烯烃催化裂解制丙烯BOC-1催化剂的放大制备及其工业应用,详细介绍催化剂放大制备后实验室小试和工业应用评价结果。BOC-1催化剂在工业生产装置中运行和再生性能良好,丙烯单程收率28.5%,碳四烯烃转化率82.1%,催化剂使用周期17天,各项性能指标均超过洛阳炼化宏力化工有限责任公司的工业催化剂水平,适合进一步推广使用。建立由烯烃催化裂解、吸收稳定、气分、MTBE醚化和烷烃分离5个单元组成的碳四烯烃资源综合利用工艺流程,并使用VMGSim流程模拟软件进行模拟计算。结果表明,采用新工艺流程,碳四烯烃综合利用率99.3%,聚合级丙烯收率35.19%。     

浅析海底管道节点IMPP涂层的施工

IMPP（注射成型聚丙烯）涂层是一种新型海管节点涂层,其耐高温、耐磨损、防腐性能好、施工自动化程度高、施工质量容易控制。这种涂层解决了高温海管节点防腐的难题,在中东等地应用广泛,但国内没有应用先例。本文介绍了某国外海管项目施工中的相关经验。 IMPP涂层的施工包括表面处理、 FBE（环氧粉末）喷涂、 CMPP（化学改性聚丙烯）喷涂和 PP（聚丙烯）注入等工序,使用的主要设备有循环磨料喷砂设备、中频加热设备、流化床、粉末喷枪、辐射加热设备、 PP注入设备等。     

某柴油机曲轴单拐疲劳试验件断裂失效分析

针对某柴油机曲轴单拐平台弯曲疲劳试验中,曲轴圆角处发生非正常断裂现象,建立曲轴疲劳破坏故障树,从试验载荷过大、曲轴本体结构设计强度不足、曲轴制造缺陷等方面进行排查。最终确定导致曲轴单拐圆角失效的主要原因为圆角表面存在氧化腐蚀坑。分析结果为曲轴设计、生产过程控制及后续质量验收提供了重要依据。