The effects of etching and deposition on the performance and stress evolution of open through silicon vias

The effects of silicon etching using the Bosch process and LPCVD oxide deposition on the performance of open TSVs are analyzed through simulation. Using an in-house process simulator, a structure is generated which contains scalloped sidewalls as a result of the Bosch etch process. During the LPCVD deposition step, oxide is expected to be thinner at the trench bottom when compared to the top; however, additional localized thinning is observed around each scallop. The scalloped structure is compared to a structure where the etching step is not performed, but rather a flat trench profile is assumed. Both structures are imported into a finite element tool in order to analyze the effects of processing on device performance. The scalloped structure is shown to have an increased resistance and capacitance when compared to the flat TSV. Additionally, the scalloped TSV does not perform as well at high frequencies, where the signal loss is shown to increase. However, the scallops allow the TSV to respond better to an applied stress. This is due to the scallops’ enhanced range of motion and displacement, meaning they can compensate for the stress along the entire sidewall and not only on the TSV top, as in the flat structure.     

Thermal Processing Affects Properties of Commercial Shrimp and Scallops

Commercial shrimp and scallops were blanched, cooked and canned and their thermal conductivity, density and volumetric expansion were measured. Thermal conductivity was measured with a line-heat source technique while density and volumetric expansion were determined with a gravimetric method. Shrimp and scallops lost moisture and shrunk by <30 and 50%, respectively. Thermal conductivities decreased by <5%, whereas densities increased by 4%.     

连续重整装置开工过程中的问题分析

中国中化集团公司泉州石化有限公司2.0 Mt/a连续重整装置的工艺设计采用反应器并列“2＋2”重叠布置和优化型扇形筒（梯形筒）结构.连续重整反应炉烘炉时,重整三反进料加热炉入口和四反进料加热炉出口的集合管发生异常位移,分别较冷态时上移了169 mm和188 mm;重整反应器部分梯形筒也发生了32～ 34 mm移位,且梯形筒之间密封压条间隙偏大;开工后的C9＋ 重芳烃干点偏高,导致汽油产品不合格.针对这些问题采取了有效的修复措施：对恒力弹簧工作载荷进行调节后,集合管恢复到了原位;对位移的梯形筒分别进行了捶打校正和填塞密封补焊;降低白土罐入口温度对降低C9＋ 重芳烃干点有利.     

Bacterial Depuration of The Mexican Scallop,Argopecten Circularis

A Mexican company plans to sell artificially cultured and cleansed adult scallops, Argopecten circularis, to Mexicans and Europeans for human consumption. A series of six experiments, comparing the effectiveness of ozone vs chlorine depuration in adult A. circularis, was performed at the aquaculture facility in La Paz. It was quite difficult to maintain oxidant residuals due to the extreme ambient temperature (+42?C), but experiments did show that both oxidants, chlorine and ozone, reduced total plate count 90–94‰ and chlorine treatment depurated scallops of coliform in the experimental treatment time.     

基于废料压凹机床台面的模具设计与制造改善浅析

以冲压机床台面被小孔废料压凹现状,通过分析废料滑落、飞溅、在现场生产、模具结构设计、在模具制造、模具生产验证等方面进行解析,指出了问题所在,并给出了解决方向和指导意见。     

钢框架梁柱焊接连接抗震性能试验研究

以梁端腹板的扇形孔形状为主要参数，进行了4个足尺铜框架梁柱焊接节点往复加载下的破坏试验。通过对弯矩-塑性转角和弯矩-累积塑性变形倍率试验曲线对比分析表明，扇形孔是节点变形能力和破坏形式的主要影响因素。改进扇形孔构造是一种有效措施，既可提高节点的抗震性能，又能保持制作工艺与传统节点基本相同。     

Domoic Acid Levels of Naturally Contaminated Scallops as Affected by Canning

Changes in domoic acid levels of toxic scallops (Pecten maximus) were monitored during the standard canning processes of pickled scallops and scallops in brine after 60 and 180 days of frozen storage. The concentration of domoic acid in whole scallops decreased by 43% after 180 days of frozen storage, the decrease being mostly in the hepatopancreas. No significant destruction of domoic acid was observed during the canning process but the transfer of toxin to packing media exceeded 30% of total toxin content in the canned product.     

曲面滑切式海湾扇贝剥壳机的设计

目前国内扇贝剥壳取肉仍以手工为主，加工环境恶劣、生产效率低。为改善这一现状，本文设计了一种针对海湾扇贝的仿人工剥壳机。仿照手工刀具剥离贝柱原理，采用弹性刀片，由气缸推动刀片贴合扇贝曲面对闭壳肌进行剥离。采用轮盘式布局，主要由贝壳切割组件、闭壳肌剥离组件等组成。利用MATLAB对测量数据进行分析，确定了闭壳肌的位置以及贝壳切割装置的切割位置距离贝壳边缘8 mm。通过Origin对扇贝壳体进行曲线拟合，建立扇贝内壳的几何模型，确定闭壳肌剥离刀片的尺寸宽b=20 mm、长l=14 mm，扇贝平均开口角度β=27?，弯曲角度范围α=2?~5?，并利用Adams进行仿真分析。试验结果表明，海湾扇贝剥壳机的剥壳成功率在85%以上，剥壳效率为20个/min，剥壳机满足扇贝加工品质及生产效率的要求。