Littman光栅外腔可调谐Yb3+双包层光纤激光器

本文对LD泵浦的光栅外腔可调谐双包层Yb3 光纤激光器进行了实验研究．采用Littman外腔结构，研究了Yb3 光纤激光器的调谐特性．输出激光调谐范围42nm，谱线宽度0．08nm，最大输出功率达到了460mW，斜率效率约30％．并对其输出光功率随波长的变化进行了观测和分析．     

1—HBTA对钢,黄铜的缓蚀作用

研究在3％NaCl水溶液和模拟冷却水介质中,不同pH值时不同浓度(0.05％、0.1％、0.5％)的1-羟基苯骈三氮唑(以下简称1-HBTA)对钢、黄铜的缓蚀作用,1-HBTA是一种阳极型缓蚀剂,对金属腐蚀的阳极过程有明显的阻滞作用,而对阴极过程影响不大。     

Fouling and Uncertainty Margins in Tubular Heat Exchanger Design: An Alternative

Fouling is a costly problem in heat exchanger design and operation. Over the past 20–30 years, design capabilities have advanced such that most fouling can be mitigated through effective design techniques. A design margin is added to the initial clean design in order to handle uncertainties in design and any deterioration in performance due to the reduced fouling that occurs in spite of good design practice. This article explains the advantages and disadvantages of three common methods for adding design margin to heat exchangers. It then introduces a new design margin method that combines the strengths of the previous three while avoiding their weaknesses.     

特种异氰酸酯改性环氧树脂的合成

采用研制的4-J氧甲酰氨基甲苯2-异氰酸酯(BCATI)或4-丙烯酰氧乙氧甲酰氨基甲苯2-异氰酸酯(AECATI)中的异氰酸基与环氧树脂或丙烯酸环氧酯树脂中的部分羟基反应,得到改性环氧树脂。经优选试验,得到了合成的适宜条件。通过化学测试与IR图解析,确定了有关合成反应的终点与产物结构,并以改性树脂为原料制成了性能优良的情漆。     

放射性气溶胶自动监测仪

本文阐述了新研制的“放射性气溶胶自动监测仪”设计原理、功能和技术指标。该仪器采样、测量和数据处理均全自动化,其最小可检出水平:用样品放射性活度表示,对β为54mBq,当采样量为10m~3时,可检出浓度为5.4mBq/m~3(1.46×10~(-16)Ci/L);对于α可达3.6mBq,若采样量为10m~3时,可检出浓度为0.36mBq/m~3(9.7×10~(-18)Ci/L)。     

系统级封装:系统级芯片解决方案的有力补充

目前的SiP(System-in-Package)设计对面临复杂片上系统芯片集成方面的挑战或分散多芯片方法的系统设计人员来说,可能意味着成本更低、上市时间更短的解决方案.设计人员通过对硅芯片技术(例如处理器、存储器和射频)在封装级别进行整合,能够设计出高功能的紧凑型组合设备.由于它比完全的硅集成所需的总成本更低,开发时间更短,同时还能够提供比使用分散型芯片解决方案更简单的印刷电路板布线.然而,为了获得可靠的、高合格率的SiP产品,必须仔细地评估设计、装配和测试方法.本文将针对一些代表各种市场分区(各有其独特的挑战)的批量生产的SiP方案中的共性的设计观点进行探讨.     

Effect of hydrophilic organic seed aerosols on secondary organic aerosol formation from ozonolysis of α-pinene

Gas-particle partitioning theory is widely used in atmospheric models to predict organic aerosol loadings. This theory predicts that secondary organic aerosol (SOA) yield of an oxidized volatile organic compound product will increase as the mass loading of preexisting organic aerosol increases. In a previous work, we showed that the presence of model hydrophobic primary organic aerosol (POA) had no detectable effect on the SOA yields from ozonolysis of α-pinene, suggesting that the condensing SOA compounds form a separate phase from the preexisting POA. However, a substantial faction of atmospheric aerosol is composed of polar, hydrophilic organic compounds. In this work, we investigate the effects of model hydrophilic organic aerosol (OA) species such as fulvic acid, adipic acid, and citric acid on the gas-particle partitioning of SOA from α-pinene ozonolysis. The results show that only citric acid seed significantly enhances the absorption of α-pinene SOA into the particle-phase. The other two seed particles have a negligible effect on the α-pinene SOA yields, suggesting that α-pinene SOA forms a well-mixed organic aerosol phase with citric acid and a separate phase with adipic acid and fulvic acid. This finding highlights the need to improve the thermodynamics treatment of organics in current aerosol models that simply lump all hydrophilic organic species into a single phase, thereby potentially introducing an erroneous sensitivity of SOA mass to emitted OA species.     

变频器在碳素配料运输车上的应用

本文介绍了用变频器控制碳素配料系统中配料运输车（配料车）的系统组成和工作原理。系统投入运行后，实现配料地运输车在接料口、放料口的准确定位停车，避免了物料抛洒，降低了设备故障率，提高了设备生产效率和产品质量。     

介观生物细胞等效电路的量子化

随着对人类基因组织的深入研究，近几年生物电子芯片技术也得以迅速发展。生物细胞的电特性显示有电容、电感和电阻的特性。本文采用阻尼谐振子的量子化方法，对介观生物细胞的等效电路实现了量子化。并讨论丁生物电信号的量子涨落。对于生物电子电路芯片的设计考虑量子效应具有指导意义。