网络拓扑图多级分割塌缩阶段算法改进

针对网络拓扑图上的宏观异常预警可视化显示需要,分析了当前图的多级划分算法.算法分为图塌缩、初始划分和多级优化三个阶段.在多级分割算法的图塌缩阶段,提出改进算法———KV算法和VC算法.实验验证改进后算法在运行时间、恢复时间和分割边数上均优于传统算法.改进塌缩KV算法在分割边数上平均提高了4.6%,在运行时间上提高了12%,而VC算法降低了KV算法的时间复杂度.     

Java多线程同步机制平台相关性浅析

Java多线程具有很大的平台相关性，导致了其同步机制的平台相关性。通过试验讨论了Java同步机制在不同平台下的成功实现和实现效率，并分析了这种平台相关性的原因和影响因素，对处理多线程同步机制的Java程序的跨平台性编写和执行具有借鉴意义。     

Enantioselective Chlorocyclization of Olefinic Amides with 1,3-Dichloro-5,5-Dimethylhydantoin(DCDMH) Catalyzed by(DHQD)_2PHAL

An efficient catalytic asymmetric chlorocyclization of olefinic amides with 1,3-dichloro-5,5-dimethylhydantoin(DCDMH)using hydroquinidine 1,4-phthalazinediyl diether((DHQD)_2PHAL)as organocatalyst has been developed.Series of chiral chloro substituted isobenzofuran-1(3H)-imine derivatives were obtained in good yields(up to 85%)and enantioselectivities(up to 70%ee).     

钢铁行业烧结烟气多污染物协同净化技术研究进展

基于我国钢铁行业烧结烟气排放标准、排放特征和现行污染物控制技术,分析了国内外先进的多污染物协同控制技术——活性炭(焦)吸附工艺、湿法脱硫除尘+选择性催化还原协同净化技术、循环流化床多组分污染物协同净化工艺、高性能烧结废气净化工艺、新型密相半干法烟气集成治理技术等工艺的技术思路、特点和存在问题等,并针对钢铁行业的实际需求对多污染物协同控制技术的发展提出了建议.     

Flexible and stretchable electrodes for next generation polymer electronics: a review

Transparent conductive electrodes play a significant role in the fabrication and development of optoelectronic devices. As next generation optoelectronic devices tend towards mobile and wearable devices, the added attribute of flexibility or stretchability for these electrodes becomes increasingly important. However, mechanical requirements aside, transparent conductive electrodes must still retain high transparency and conductivity, with the metrics for these parameters being compared to the standard, indium tin oxide. In the search to replace indium tin oxide, two materials that have risen to the forefront are carbon nanotubes and silver nanowires due to their high transparency, conductivity, mechanical compliance, and ease of fabrication. This review highlights recent innovations made by our group in electrodes utilizing carbon nanotubes and silver nanowires, in addition to the use of these electrodes in discrete devices and integrated systems.     

Determination of pseudo‐ginsenoside GQ in human plasma by high performance liquid chromatography–tandem mass spectrometry

A specific, sensitive and rapid method based on high performance liquid chromatography coupled to tandem mass spectrometry (HPLC‐MS/MS) was developed for the determination of pseudo‐ginsenoside GQ in human plasma. Liquid–liquid extraction was used to isolate the analyte from biological matrix followed by injection of the extracts onto a C₈ column with isocratic elution. Detection was carried out on a triple quadrupole tandem mass spectrometer (API‐4000 system) in multiple reaction monitoring mode using negative electrospray ionization. The mobile phase consisted of methanol–10 mm ammonium acetate (90:10, v/v) and the flow rate was 0.3 mL/min. The method was validated over the concentration range of 5.0–5000.0 ng/mL for plasma. Inter‐ and intra‐day precisions (relative standard deviation) were all within 15% and the accuracy (relative error) was ≤9.4%. The lower limit of quantitation was 5.0 ng/mL. The pseudo‐ginsenoside GQ was stable after 8 h at room temperature, 24 h at autosampler and three freeze–thaw cycles (from ?30 to 25 °C). The method was successfully applied to the pharmacokinetic study of pseudo‐ginsenoside GQ in healthy Chinese volunteers. Copyright © 2013 John Wiley & Sons, Ltd.     

Thermal-oxidative degradation of high-amylose corn starch

Thermal oxidation degradation of high-amylose (80 %) cornstarch has been studied using thermogravimetry analyser coupled to Fourier transform infrared spectroscopy (TG-FTIR). The linear structure of amylose provides a modal material to understand how the starch microstructure affects on the decomposition mechanisms. Kinetics of the thermal oxidation has been studied using different methods. It is found that the thermal oxidation degradation is more complex than thermal degradation, thermal oxidation degradation kinetics of the starch can be interpreted in terms of multi-step degradation mechanism, the activation energies obtain from Flynn–Wall–Ozawa (F–W–O) method and modified Coats–Redfern method are in good agreement. TG-FTIR and FTIR results confirm that the thermal oxidation mechanism of starch is a process containing long chain scission and glowing combustion.     

Pyrone Diels–Alder Routes to Indolines and Hydroindolines: Syntheses of Gracilamine,Mesembrine, and Δ7‐Mesembrenone

Although the Diels–Alder reaction has long been utilized for the preparation of numerous heterocycles, opportunities to extend its power remain. Herein, we detail a simple, modular, and robust approach that combines various amines regioselectively with 4,6‐dichloropyrone to create substrates which, under appropriate conditions, can directly deliver varied indolines and hydroindolines through [4+2] cycloadditions with substitution patterns difficult to access otherwise. As an initial demonstration of the power of the strategy, several different natural products have been obtained either formally or by direct total synthesis, with efforts toward one of these—the complex amaryllidaceae alkaloid gracilamine—affording the shortest route to date in terms of linear step count.     

Synthesis and photovoltaic properties of conjugated side chains polymers with different electron‐withdrawing and donating end groups

A series of novel low band gap polymers containing conjugated side chains with 4,7‐dithien‐5‐yl‐2,1,3‐benzodiathiazole and different electron‐withdrawing end groups of aldehyde ( PT‐DTBTCHO ), 2‐ethylhexyl cyanoacetate ( PT‐DTBTCN ), 1,3‐diethyl‐2‐thiobarbituric acid ( PT‐DTBTDT ), and electron‐donating end group of 2‐methylthiophene ( PT‐DTBTMT ) have been designed and synthesized. All polymers exhibit good solubility in common organic solvents, film‐forming ability, and thermal stability. These conjugated polymers show the broad ultraviolet‐visible absorption and the narrow optical band gaps in the range of 1.65–1.90 eV. Through changing the end group of conjugated side chains, the photophysical properties and energy levels of the polymers were tuned effectively. Bulk heterojunction solar cells based on the blend of these polymers and (6,6)‐phenyl‐C₆₁‐butyric acid methyl ester (PC₆₁BM) reached the best power conversion efficiency (PCE) of 2.72%. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012