PC/PPI电缆使用中的问题及其解决方法

PC/PPI电缆是一种RS-232转RS-485的串行通讯电缆,RS-232是短距离串行通讯协议,而RS-485通讯协议适合长距离传输。由于串行通讯的通讯距离已经超过了RS-232协议所要求的距离,并且现场的PLC200支持RS-485通讯协议,所以需要将RS-232协议转换成RS-485协议,并且在某些情况下还需要用延长线来加长,这样才能将通讯线连上。     

Enhancement of Enzymatic Saccharifi-cation of Wheat Straw Residue by Ammonium Sulfite Pretreatment

Efficient utilization of wheat straw residue(WSR) from pulp mills is an important priority for the sustainable development of the pulp and paper industry. In this study, the effects of ammonium sulfite(AS) pretreatment with different AS charges(wt%) and pretreatment temperatures on the chemical composition and enzymatic hydrolysis of WSR were studied. The results revealed that more lignin was removed with the increase of pretreatment temperature and AS charge. The degradation of hemicellulose became severe at high pretreatment temperature, while cellulose remained stable during the pretreatment process. The enzymatic hydrolysis efficiency of pretreated WSR was increased and then decreased with the increase of the AS charge and pretreatment temperature. The AS charge exerts a stronger effect on enzymatic hydrolysis efficiency than the pretreatment temperature. Glucan and xylan conversion ratios up to 88.9% and 44.9%, respectively, were obtained. The highest total sugar conversion ratio was 67.0% when WSR pretreated with 16% AS at 165℃ was hydrolyzed with a cellulase loading of 40 FPU per gram of glucan.     

扫描架IP不通的故障分析与处理

山东泉林集团有限公司抄八车间的QCS质量控制系统用的是ABB公司的SP700扫描架,卷取部扫描架的通讯出现问题,在服务器上连不上扫描架的IP,不能够看到纸张的横幅曲线,严重影响了纸的质量控制。通过检查Bram板、MPRC板、现场测试IP和检查光缆等步骤,最后发现是一个电源适配器供电不足造成的。下面我把处理过程介绍如下,供参考。     

双元助剂在麦草蒸煮中的应用

该文通过应用实例详细地论述了双元助剂体系在麦草浆生产线上的试验过程。结果表明,使用0.08%(相对于绝干原料)的含醌型蒸煮助剂和0.08%(相对于绝干原料)的蒸煮渗透剂组成双元蒸煮助剂体系能够发挥比单一助剂更强大的作用:改善了麦草浆的滤水性能,缩短了蒸煮时间,降低了生产成本。     

150t/d漂白草浆生产线节水改造

介绍了制浆车间漂白工段中段废水利用方式,提高生产用水循环利用率,同时做好节水宣传,加强细节管理,吨浆水耗由原来的73.37m3降低到58.83m3。     

Effect of grafted polymeric foaming agent on the structure and properties of nano-silica/polypropylene composites

To promote dispersion of nano-silica in polypropylene (PP), a polymerizable foaming agent p-vinylphenylsulfonylhydrazide was synthesized and grafted onto the nanoparticles via free-radical polymerization. It was found that the grafted poly(p-vinylphenylsulfonylhydrazide) played dual role when being melt mixed with PP. The side sulfonylhydrazide groups were gasified to form polymer bubbles, leading to rapid inflation of the surrounding matrix that pulled apart the agglomerated nanoparticles, while the remaining backbone of the grafted polymer helped to improve the filler/matrix interaction through chain entanglement and interdiffusion at the interface. Mechanical tests indicated that the grafted nano-SiO₂/PP composites prepared according to the above strategy were simultaneously toughened, strengthened and stiffened. Compared with conventional graft polymerization treatment where no blowing function is associated, the technique proposed in this work could significantly enhance notch impact strength of PP.     

造纸化学品的计量

论述了造纸工业中化学品的计量设备,分析了不同计量设备的工作原理、使用方法及需要注意的事项。     

电泳漆膜出现针孔弊病的原因探讨

通过一次电泳质量事故的调查处理,深入分析了影响事故发生的原因,最终确定了杂质离子含量高是造成漆膜针孔事故的主要原因,主要阐述了电泳漆膜出现针孔弊病的影响因素及解决的办法。     

Metabolic engineering challenges in the post-genomic era

Metabolic engineering is a young field, just over ten-years old. During this period, it has developed a well-defined methodology and a focused research portfolio of rich intellectual content and particular relevance to biotechnology and biological engineering. New and diverse opportunities for metabolic engineering emerge quickly in this genomic era. Although the focus (e.g. improving cells) and central components (e.g. assessing cell physiology) of metabolic engineering remain the same, new tools are required to take advantage of the opportunities arising from the availability of whole-genome sequence information. Cellular phenotype is a manifestation of gene expression levels, metabolic demand, resource availability, and cellular stresses. Above all, metabolic function is constrained by the stoichiometry and individual reaction kinetics of the reaction network. To understand the behavior of these systems, the well-established framework of reaction engineering must be complemented with new experimental methods specifically designed for the elucidation of metabolic pathways and bioreaction networks. Most of all, a combination of rational and combinatorial approaches is required to effectively sample and map as much of the metabolic space as possible.The above framework along with important tools of metabolic engineering will be reviewed in this article. We will then show their application to case studies of industrial and medical interest while emphasizing the strong influence and links of metabolic engineering to chemical reaction engineering.     

高级文化用纸流送系统工艺设计

介绍了高级文化用纸流送系统工艺流程的特点,以及工艺设计中的主要指导方针.