全自动键合机工艺调试方法

介绍新型金球键合机工艺调试过程,分析并解决调试过程中遇到的工艺问题。     

多晶硅清洗设备研究

介绍了多晶硅清洗设备,即：硅块、硅棒／硅芯清洗设备。并对其结构设计进行阐述。对设备关键部件-工艺槽、机械臂的设计进行了详细的说明。该设备满足了大规模生产的需要,能够保证产品的品质及生产效率。     

太阳能电池生产线中的新型等离子体刻蚀机的研制

介绍了用于太阳能电池片生产工艺中的新型等离子体刻蚀机及设备的工作原理、构造、简单的工艺试验结果。与现在生产线上普遍使用的老式等离子体刻蚀机相比,它大大提高了生产产能,减少了设备维护工作量。该设备操作简单,是一种实用、高效的生产型工艺设备。     

激光熔覆工艺参数对金属成形效率和形状的影响

针对激光熔覆再制造装备零件的快速高效熔覆成形及其控形问题,采用1kW全固态激光器和铁基合金粉末进行了不同激光线能量和送粉量下单道熔覆对比实验,研究了激光功率、激光扫描速度和送粉量等主要工艺参数对熔覆线形状尺寸和金属成形效率的影响.结果表明:熔覆线的宽度是光斑直径、激光功率、激光扫描速度和送粉量的函数,随激光功率增加和激光扫描速度降低,熔宽增加;随送粉量增加熔高增大.成形效率随工艺参数变化具有复杂的变化趋势,随激光线能量增加和送粉量增加,成形效率一般增高.在合适的参数范围内,需要对工艺参数进行优化以获得较高的成形效率.     

多层印制板金属化槽孔孔壁剥离探析及改善

孔壁剥离是影响印制板可靠性的系统问题之一。作为一类特殊的金属化孔-金属化槽孔,相对于普通金属化圆孔来讲,其孔壁剥离问题显得更为突出和棘手。文章在金属化圆孔孔壁剥离的原因分析基础上,从残余应力及孔壁结合力两方面出发,进一步对金属化槽孔的孔壁剥离问题进行探析,介绍了残余应力去除方法和分析了金属化槽孔的机械加工方式、凹蚀参数对孔壁结合力的影响,为改善金属化槽孔孔壁剥离提供了建议。     

Review: Highlights in recent applications of electronic tongues in food analysis

This paper examines the main features of modern electronic tongues (e-tongues) and their most important applications in food analysis in this new century. The components of an e-tongue (automatic sampler, array of chemical sensors, and data processing system) are described. Applications commented include process monitoring, freshness evaluation and shelf-life investigation, authenticity assessment, foodstuff recognition, quantitative analysis, and other quality control studies. Finally, some interesting remarks concerning the strengths and weaknesses of e-tongues in food analysis are also mentioned.     

Membrane capacitive deionization

Membrane capacitive deionization (MCDI) is an ion-removal process based on applying an electrical potential difference across an aqueous solution which flows in between oppositely placed porous electrodes, in front of which ion-exchange membranes are positioned. Due to the applied potential, ions are adsorbed in the electrodes and a product stream with a reduced salt concentration is obtained. Including the membranes in the process has two advantages: first, they block co-ions from leaving the electrodes, thereby increasing the salt removal efficiency of the process, and second, when during ion release a reversed voltage is used, counterions can be more fully flushed from the electrode region, thereby increasing the driving force for ion removal in the next cycle. Here we present pilot-plant experimental data for salt removal in MCDI as function of inlet ionic strength and flow rate. In the subsequent stage of ion release the flow rate is temporarily reduced to zero and the voltage sign reversed. This “stop-flow” operation mode results in a small and concentrated product stream. We present a theoretical process model for MCDI which describes the time-dependent electric current and effluent ion concentration, both during the deionization stage and during the subsequent stage of ion release. The process model describes the MCDI cell as a number of stirred volumes placed in-series, and includes the transport resistance of the ion-exchange membrane and of the stagnant diffusion layer in front of the membrane. Ion storage in the electrodes is described according to the equilibrium Gouy–Chapman–Stern model for the electrostatic double layer.     

Examples of the application of optical process and quality sensing (OPQS) to beer brewing and polyurethane foaming processes

Optical methods play an important role in process analytical technologies (PAT). Four examples of optical process and quality sensing (OPQS) are presented, which are based on three important experimental techniques: near-infrared absorption, luminescence quenching, and a novel method, photon density wave (PDW) spectroscopy. These are used to evaluate four process and quality parameters related to beer brewing and polyurethane (PU) foaming processes: the ethanol content and the oxygen (O2) content in beer, the biomass in a bioreactor, and the cellular structures of PU foam produced in a pilot production plant.     

项目挣值法在产品认证管理中的应用

产品认证管理中,进度和费用是最重要的两个评价指标.但目前,还没有一个很好的方法来全面反映产品认证过程中的进度和费用是否符合预定的计划目标.本文引用项目管理中的挣值法来判断和反映这两个指标参数,能很好的确定认证项目在进度和费用上是否符合预定计划.     

统计过程控制(SPC)在小批量生产条件下的应用研究

在小批量生产条件下,传统的休哈特控制图不再适用,在这种情况下,本文提出了一种有效的统计过程控制工具一代码值图,来实现对过程的控制。并结合具体实例对该控制工具,进行了验证,结果表明,此控制工具在小批量生产条件下的过程控制中是可行的和有效的。