Dwell time effect in peeling PSA laminates

Air, trapped interfacially between the adhesive and the substrate, can have a detrimental effect on the peel strength of bonds formed by a PSA and relatively impermeable adherends. If the adhesive wets the substrate surface so that the contact angle is small then the forces of the surface tension within the adhesive can lead to the gradual expulsion of these pockets of air and thereby to the enhancement of the peel strength-the dwell-time effect. Using a high-performance PSA transfer tape it has been found that this strengthening effect may operate over many thousands of hours. With increasing hydrophobicity of the surfaces, this effect can be suppressed and a poor peel strength remains essentially constant with time. The observed rates at which the peel strength increases are quantitatively consistent with diffusion of entrapped air out of the interface. © 2012 Copyright Taylor and Francis Group, LLC.

两种不同终止子在转基因鲤鱼中的促生长效应

转基因构建体中启动子的选择会直接影响转植基因的活性,近年来有研究表明转基因构建体中终止子的选择会一定程度地影响转植基因的活性。为了更好地筛选转基因构建体和培育快速生长的转"全鱼"生长激素(Growth hormone,GH)基因鱼,文章用鲤鱼β-actin基因终止子和生长激素基因终止子分别构建了转基因构建体,显微注射得到转"全鱼"GH基因鱼P0代养殖群体,比较两种不同终止子构建体的活性。统计分析发现,生长激素基因终止子构建体的养殖群体的体重频率呈正态分布且平均体重显著高于β-actin基因终止子构建体的养

斑点叉尾鮰套肠症的病原学初步研究

本研究从2例垂死的患败血症并肠套叠的斑点叉尾鮰血液、肝脏及脑组织中分离到2种类型的致病性细菌菌株,经对细菌进行形态观察、生理生化测试和16S rDNA序列分析,分别鉴定为嗜水气单胞菌和荧光假单胞菌;攻毒实验证实它们确为斑点叉尾鮰病鱼的病原。根据药敏实验的结果,及时对病区斑点叉尾鮰进行治疗,连续用药3—5d,发病的叉尾鮰即停止死亡。根据研究结果,文章对斑点叉尾鮰肠套叠发生的原因进行了的分析,提出了不同的观点。

Recoil distance method lifetime measurements in 107Cd and 103Pd

Preliminary lifetime values have been measured for a number of near-yrast states in the odd-A transitional nuclei 107Cd and 103Pd. The reaction used to populate the nuclei of interest was 98Mo( 12C,3nxα)107Cd, 103Pd, with the beam delivered by the tandem accelerator of the Wright Nuclear Structure Laboratory at an incident beam energy of 60 MeV. Our experiment was aimed at the investigation of collective excitations built on the unnatural parity, ν h11/2 orbital, specifically by measuring the B(E2) values of decays from the excited levels built on this intrinsic structure, using the Doppler Recoil Distance Method. We report lifetimes and associated transition probabilities for decays from the 15/2- and the 19/2- states in 107Cd and the first measurement of the 15/2- state in 103Pd. These results suggest that neither a simple rotational or vibrational interpretation is sufficient to explain the observed structures. © 2006 American Institute of Physics.

Centrifuge testing of monopiles subject to cyclic lateral loading

Monopiles supporting offshore wind turbines are subjected to cyclic lateral loading. The properties of the applied cyclic lateral load are known to have an effect on the accumulation of permanent displacement and rotation at the pile head. The results of centrifuge testing on model piles show that certain loading regimes lead to the development of locked in soil stresses around the pile. These locked in soil stresses change the stiffness of the monopile response to cyclic lateral loading and the natural frequency of the pile-soil system. © 2014 Taylor & Francis Group.

开放式实时环境中的集成调度框架

开放式实时环境中的多类型实时任务并存的情况给实时调度机制带来了新的需求和挑战 提出了一种适用于开放式实时环境的 3层集成调度框架 ,它基于服务器方式的实时调度理论 ,把 5种既有相关性又有功能互补特征的服务器有机的集成到统一的调度机制中 可支持多种类型的实时任务及非实时任务共存于同一系统的混合调度 ,并且根据它们的属性自动选择最合适的服务器与之搭配 相对于现有方法 ,该调度框架可支持的调度对象类型更广泛 ,易于进行服务质量控制 ,并且有良好的可扩展性 因此 ,更适合于开放式实时环境

结构参数对GaN肖特基紫外探测器性能的影响及器件设计

研究了GaN肖特基结构(n~--GaN /n~+-GaN)紫外探测器的结构参数对器件性能的影响机理.模拟计算结果表明:提高肖特基势垒高度和减小表面复合速率,不仅可以增加器件的量子效率,而且可以极大地减小器件的暗电流;适当地增加n~--GaN层厚度和载流子浓度可以提高器件的量子效率,但减小n~--GaN层的载流子浓度却有利于减小器件的暗电流.我们针对实际应用的需要,提出了一个优化器件结构参数的设计方案,特别是如果实际应用中对器件的量子效率和暗电流都有较高的要求,肖特基势垒高度应该≥0.8 eV,n~--GaN层的厚度≥200 nm,载流子浓度1×10~(1)7 cm~(-3) 左右,表面复合速率＜1×10~7 cm/s.

大功率半导体列阵激光器的偏振复用技术研究

根据大功率半导体激光器输出光束的偏振特性,基于偏振复用的原理,分别利用双折射晶体和偏振合束晶体对两只大功率半导体线列阵激光器进行了偏振合束研究.依据理论计算结果,生长了双折射晶体YVO4,并进行了特殊的光路系统设计,最终实现了偏振复用,功率效率达到66%;利用偏振合束,晶体功率效率为85%.最后,从各方面比较了两种方法的优缺点.

3kW高效、高功率全固态连续波激光器

全固态激光器兼备了半导体激光器和固体激光器的双重优点，具有效率高、光束质量好、结构紧凑、寿命长等优点，近年来已成为激光学科的重点发展方向之一，高功率全固态激光器在工业加工、军事和科研等领域有十分重要的用途。本实验利用自主研制的高功率激光头，采用Nd

BaFI:Eu（2＋）中的新型色心及其发光

国家自然科学基金,东南大学吴健雄国家实验室基金

GaN的MOCVD生长

GaN是重要的蓝光半导体材料。以TMGa和BH_3为源在(0112)α-Al_2O_3衬底上成功的用MOCVD方法生长了GaN外延层,研究了GaN的表面形貌与结晶学、电学和光学特性。GaN(2110)面的双晶回摆曲线衍射峰的最小半高宽已达16'。并观测到GaN所发出的紫外可见光波段的阴极荧光。