荧光法研究钙离子存在下槲皮素与牛血清白蛋白的相互作用

用荧光法研究了钙离子存在下槲皮素与牛血清白蛋白的相互作用。结果表明,与槲皮素一样,槲皮素-钙离子以形成配合物的形式静态猝灭牛血清白蛋白的内源性荧光,钙离子在一定范围内对槲皮素与牛血清白蛋白的结合起着重要的作用,槲皮素与牛血清白蛋白、槲皮素-钙离子与牛血清白蛋白的表观结合常数/结合位点数分别为5.905×105L.mol-1/1.012、1.245×106L.mol-1/1.037。     

硝唑尼特合成工艺的研究

由乙酰水杨酸和2-氨基-5-硝基噻唑为原料,选用N,N-二甲基甲酰胺和三乙胺分别作为催化剂和缚酸剂,经酰胺化反应生成一种抗寄生虫新药—硝唑尼特,其较佳的工艺条件:酰氯化反应温度70℃,氯化亚砜与乙酰水杨酸的摩尔比为1.3∶1,乙酰水杨酸与2-氨基-5-硝基噻唑的摩尔比为1.4∶1,酰胺化反应时间2.5 h,收率达76.8%。该工艺简单,收率高,具有较好的应用价值。     

The Lyapunov direct method for the stabilisation of the ball on the actuated beam

This article deals with the stabilisation of a ball on an actuated beam independently of whether or not the force acts on the non-actuated coordinate. The feedback control law is deduced via application of the traditional Lyapunov stability method. The balancing strategy consists of shaping a convenient energy function that allows us to derive the required asymptotic stabilising controller. To this end, we introduce an auxiliary control input variable in order to algebraically obtain the kinetic metric and the potential energy of the entire system. The formed positive energy function along with the proposed feedback controller assures that the overall system is a dissipative one.     

Thermal Effusivity of Vegetable Oils Obtained by a Photothermal Technique

Thermal properties of several vegetable oils such as soy, corn, and avocado commercial oils were obtained by using a photopyroelectric technique. The inverse photopyroelectric configuration was used in order to obtain the thermal effusivity of the oil samples. The theoretical equation for the photopyroelectric signal in this configuration, as a function of the incident light modulation frequency, was fitted to the experimental data in order to obtain the thermal effusivity of these samples. The obtained results are in good agreement with the thermal effusivity reported for other vegetable oils. All measurements were done at room temperature.     

Design and Implementation of an Extended Collectives Library for Unified Parallel C

Unified Parallel C(UPC) is a parallel extension of ANSI C based on the Partitioned Global Address Space(PGAS) programming model,which provides a shared memory view that simplifies code development while it can take advantage of the scalability of distributed memory architectures.Therefore,UPC allows programmers to write parallel applications on hybrid shared/distributed memory architectures,such as multi-core clusters,in a more productive way,accessing remote memory by means of different high-level language constructs,such as assignments to shared variables or collective primitives.However,the standard UPC collectives library includes a reduced set of eight basic primitives with quite limited functionality.This work presents the design and implementation of extended UPC collective functions that overcome the limitations of the standard collectives library,allowing,for example,the use of a specific source and destination thread or defining the amount of data transferred by each particular thread.This library fulfills the demands made by the UPC developers community and implements portable algorithms,independent of the specific UPC compiler/runtime being used.The use of a representative set of these extended collectives has been evaluated using two applications and four kernels as case studies.The results obtained confirm the suitability of the new library to provide easier programming without trading off performance,thus achieving high productivity in parallel programming to harness the performance of hybrid shared/distributed memory architectures in high performance computing.     

β-CD交联聚合物的制备及处理苯酚废水

以β-环糊精(β-CD)和二苯基甲烷二异氰酸酯(MDI)为原料,通过聚合加成反应制得β-CD-MDI交联聚合物。采用红外光谱(IR)、扫描电镜(SEM)、元素分析对交联产物进行表征。探讨了交联聚合物的加入量、苯酚溶液初始质量浓度对苯酚去除率的影响。结果表明,β-CD-MDI保留了β-CD的空腔结构,表面形貌由层状变为层状交联,分子式为(C42H70O35)(C15H10N2O2)7.45。β-CD-MDI用量40 g/L,温度30℃,机械搅拌150 r/min,pH=5～7,时间40 min,对苯酚去除率为98.5%,重复使用6次后对苯酚去除率仍有97%。     

Flatness-based approach for the manipulation of a microscopic particle by optical tweezers

Based on the fact that optical tweezers (OT) constitute a flat system, with flat outputs given by the horizontal and vertical position coordinates of the geometric centre of the laser beam, a flatness-based control strategy for the manipulation of a microscopical particle is presented in this article. The control strategy is derived under the assumption that the particle is suspended in a frictionless medium, obtaining a simple controller with a relatively simple stability analysis. The control strategy is tested by tracking a straight line, an elliptic curve, and carrying out the rest-to-rest transfer manoeuvre task by using a smooth trajectory.     

Magnetic field effects on electroluminescence in phosphorescence organic light emitting diodes

In this letter, we presented a method to study the MFEs on the triplets in phosphorescent OLEDs. The magnetic electroluminescence (MEL) was obtained by doping a red phosphorescent guest with low concentration into a fluorescent host, where the guest and host can simultaneously emit. Experimentally two different MEL shapes of Lorentz and linear were observed, depending on the used host materials. We presented two different mechanisms to explain their difference. The diffusion process of triplets from host to guest and prolonged lifetime of triplet by magnetic field were attributed to the formation of the Lorentz shape, and it is considered that the linear shape was caused by magnetic field increased Dexter energy transfer rate and determined by the triplet energy difference between guest and host. It can be seen that the competition of two processes lead to the formation of the two different MEL shapes in the phosphorescent OLEDs.     

Improvement of data retention characteristics of OSOSO multi-stacked MIS capacitor for flat panel display technology

The data retention ability in metal–oxide–silicon–oxynitride–silicon (MOSOS) devices can be improved using a thicker tunneling layer and novel multi-stacked oxide–silicon–oxynitride–silicon–oxynitride (OSOSO) structure. The OSOSO devices showed 7 fold increase (53.5%) of data retention after a decade compared to OSO devices (6.71%). The improvement in data retention is attributed to the excellent resistance of the charge retention due to the redistribution of electric field across the multi-stacked layers. The spilt storage layer provided a room for storing more charges in different positions of the layers resulting in ~2–3 times increase in memory window. Hence, the performances of those devices are suitable for data storage application in the system-on-panel (SOP) display.