河北某难选钼矿石酸浸浸钼试验

河北某难选钼矿石氧化程度较高,氧化钼占总钼的52.54%,主要以钼华、钼钙矿和钼铅矿等形式存在;硫化钼矿物主要为非晶质或隐晶质胶硫钼矿,多以胶状集合体产出,单体解离困难,可浮性较差。为高效开发利用该钼矿资源,进行了酸浸工艺条件研究。结果表明,100 g粒度为-2 mm的试样中加入30 g浓硫酸,在液固比为1.5 mL/g、浸出温度为90 ℃、搅拌器转速为250 r/min情况下浸出3 h,钼浸出率达86.19%。因此,硫酸酸浸工艺是该资源的高效开发利用工艺。     

基于SOA的业务流程管理在模具协同设计任务管理中的应用

为了实现模具设计任务的自动管理,结合模具设计任务的特点,提出了基于活动树的任务分解模型.该模型能最大程度地避免任务间冲突的发生,并且能够保证模具设计人员之间模型信息的一致.在此模型的基础上,结合业务流程管理技术开发出了一套模具协同设计任务管理原型系统.该系统提高了模具协同设计的自动化程度,实现了模具设计任务的自动管理.     

离子选择电极法测定电铅灰中的氟与氯

使用SevenMulti 型PH/电导率/离子综合测试仪检测电铅灰中氟、氯含量。用加入了过氧化氢的柠檬酸与硝酸的混合酸溶解电铅灰,硝酸与过氧化氢可以消除硫离子对氯含量测定的干扰,柠檬酸与氟总离子强度调节缓冲溶液可以消除电铅灰中铁、铝对氟含量测定的干扰。测试结果显示,该方法精密度（相对标准偏差）F-小于1.50%,Cl-小于0.65%。准确度（加标回收率）F-在102.1%~105.3%之间,Cl-在93.0%~109.3%之间,电铅灰中共存离子对F-和Cl-的测定无干扰。该方法用于电铅灰中氟和氯的同时测定,具有很好的可行性和实用性。     

PCB上串扰的耦合机理和优化分析模型

本文从频域与时域两个方面分析了PCB上的串扰的耦合机理,探究了耦合电容以及近端和远端电阻的影响。针对2-π串扰电路模型所提出的时域上的数学优化模型,明确了信号上升沿对干扰输出的影响。并且利用Hyperlynx软件包进行仿真,比较了耦合电容、耦合长度等的作用结果,仿真结果证明了理论分析的正确性。     

Electrospun polymer nanofibers with internal periodic structure obtained by microphase separation of cylindrically confined block copolymers

Continuous fibers are described having concentric layer or aligned sphere microphase-separated, styrene-isoprene block copolymer morphologies. The fibers are obtained by a two-fluid coaxial electrospinning technique in which the desired block copolymer is encapsulated as the core component within a polymer shell having a high glass transition temperature (Tg). The fibers range in diameter from 300 to 800 nm, and the block copolymer core ranges from 50 to 500 nm. Subsequent annealing of the fibers above the upper Tg of the block copolymer but below the Tg of the shell polymer results in microphase separation of the block copolymer under cylindrical confinement. The resulting fibers exhibit improved long-range order. This two-step strategy creates the opportunity to fabricate continuous nanofibers with periodic internal structure.     

Near-field electrospinning

A near-field electrospinning (NFES) process has been developed to deposit solid nanofibers in a direct, continuous, and controllable manner. A tungsten electrode with tip diameter of 25 microm is used to construct nanofibers of 50-500 nm line width on silicon-based collectors while the liquid polymer solution is supplied in a manner analogous to that of a dip pen. The minimum applied bias voltage is 600 V, and minimum electrode-to-collector distance is 500 microm to achieve position controllable deposition. Charged nanofibers can be orderly collected, making NFES a potential tool in direct write nanofabrication for a variety of materials.     

锅炉燃烧控制系统改进

大庆油田天然气分公司现有锅炉和加热炉30余台,燃烧系统50余套,普遍存在着因燃烧系统误报警而经常停炉的问题。通过对锅炉燃烧控制系统的应用研究,引进了先进的冗余技术,重复配置系统的一些部件,当系统发生故障时,冗余配置的部件介入并承担故障部件的工作,可很好地解决停炉问题。燃烧系统稳定工作,可以节能降耗,提高装置运行效益和社会安全效益,具有较好的推广价值。     

How To Find a Needle (or Anything Else) in a Haystack: Two-Dimensional Correlation Spectroscopy-Filtering with Iterative Random Sampling Applied to Pharmaceutical Heparin

Risks of contamination of the major clinical anticoagulant heparin can arise from deliberate adulteration with unnatural or natural polysaccharides, including heparin from other animal sources, other natural products, or artifacts of manufacture, and these can escape detection by conventional means. Currently, there is no generally applicable, objective test recommended by regulators that can detect these in pharmaceutical heparin, and this continues to leave heparin exposed to contamination risks. Two-dimensional correlation spectroscopic-filtering with iterative random sampling (2D-COS-firs) is reported. It employs a difference covariance matrix with iterative random sampling, and is capable of revealing contamination in pharmaceutical heparin to a high level of sensitivity irrespective of the nature of those features. The technique is suitable to any situation in which a comparison of a single entity to a family of heterogeneous entities, particularly natural products and biosimilars, needs to be made, and will find application in pharmaceutical monitoring, manufacturing quality control, materials science, biotechnology, and metabolomic investigations.     

Sputtered nickel oxide thin film for efficient hole transport layer in polymer-fullerene bulk-heterojunction organic solar cell

Bulk-heterojunction (BHJ) organic photovoltaics (OPV) are very promising thin film renewable energy conversion technologies due to low production cost by high-throughput roll-to-roll manufacturing, an expansive list of compatible materials, and flexible device fabrication. An important aspect of OPV device efficiency is good contact engineering. The use of oxide thin films for this application offers increased design flexibility and improved chemical stability. Here we present our investigation of radio frequency magnetron sputtered nickel oxide (NiO_x) deposited from oxide targets as an efficient, easily scalable hole transport layer (HTL) with variable work-function, ranging from 4.8 to 5.8 eV. Differences in HTL work-function were not found to result in statistically significant changes in open circuit voltage (V_oc) for poly(3-hexylthiophene):[6,6]-phenyl-C₆₁-butyric acid methyl ester (P3HT:PCBM) BHJ device. Ultraviolet photoemission spectroscopy (UPS) characterization of the NiO_x film and its interface with the polymer shows Fermi level alignment of the polymer with the NiO_x film. UPS of the blend also demonstrates Fermi level alignment of the organic active layer with the HTL, consistent with the lack of correlation between V_oc and HTL work-function. Instead, trends in j_sc, V_oc, and thus overall device performance are related to the surface treatment of the HTL prior to active layer deposition through changes in active layer thickness.     

基于S-O-R模型的顾客认同对消费者流体验影响

通过实证研究手机品牌体验店中影响消费者流体验的因素,以对流体验理论进行深入研究并为我国体验式营销提供有益的参考,提出零售环境、品牌声誉和消费者知识使消费者产生顾客认同进而在顾客认同的基础上产生流体验的S-O-R模型,实证了顾客认同能显著地影响流体验,且零售环境、品牌声誉和消费者知识这三个前因变量均对顾客认同有显著的正向影响。