64位时代大功率电源选购通

过去因为机箱通常自带电源。所以我们很少主动去挑选，以为整合的东西很好，至少省事。但后来电脑硬件百花齐放般地发展，使得大家开始注意它。而且随着电脑进入64位跗代，单独选购一款大功率电源也非常有必要，但自选也带来不少问题，面对众多品牌我们该如何下手，更有奸商提供的产品比整合的电源还便宜，伴随着种种疑问，希望笔者提供的分析能帮大家早日找到自己的“心中所属”。[编者按]     

温谈CPU真假辨别

如果购买了不合格的CPU就会给电脑装上一颗脆弱的“芯”，后果很可能烧坏其他配件，给我们带来麻烦。认清假冒伪劣产品的真实面目。法和如何辨别做一翻介绍，让大家认清假冒伪劣产品的真实面目。[编者按]     

Data preprocessing using hybrid general regression neural networks and particle swarm optimization for remote terminal units

Data corruption in SCADA systems refers to errors that occur during acquisition, processing, or transmission, introducing unintended changes to the original data. In SCADA-based power systems, the data gathered by remote terminal units (RTUs) is subject to data corruption due to noise interference or lack of calibration. In this study, an effective approach based on the fusion of the general regression neural network (GRNN) and the particle swarm optimization (PSO) technique is employed to deal with errors in RTU data. The proposed hybrid model, denoted as GRNN-PSO, is able to handle noisy data in a fast speed, which makes it feasible for practical applications. Experimental results show the GRNN-PSO model has better performance in removing the unintended changes to the original data compared with existing methods.     

Polar and Non-Polar Solvent Permeation Resistance of Blow-Molded Bottles of Polyethylene/Blends of Modified Polyamide and Polyamide 6 Clay Nanocomposite

Investigations on white spirit and acetone permeation resistance of modified polyamide and nylon 6 clay (MPANYC) blends and their corresponding polyethylene/MPANYC bottles were reported in this study. The white spirit and acetone permeation resistance of MPANYC sheets improve consistently with increasing NYC contents present in MPANYC resins after blending nylon 6 clay (NYC) in modified polyamide (MPA) resins. However, the order of barrier improvement of the PE/MPANYC and PE/NYC bottle specimens is not corresponding to the order of barrier improvement of the MPANYC and/or NYC barrier resins added in PE. The blow-molded PE/NYC bottle specimen exhibits similarly worse white spirit and acetone solvent permeation resistance as the PE bottle specimen, wherein no clearly formed NYC laminas but only dispersed NYC droplets or agglomerates were found on the fracture surfaces of the PE/NYC bottles. However, after blending optimum compositions of MPANYC in PE, the PE/MPANYC bottles with demarcated MPANYC laminas exhibit significantly better white spirit and acetone permeation resistance than the PE/MPA bottle, wherein the white spirit and acetone permeation rates of the PE/MPA₈NYC₁ bottle are about 1.3 and 1.4 times slower than those of the PE/MPA bottle, respectively. In order to understand these interesting barrier properties of PE/MPANYC and PE/NYC bottles, rheological, thermal, wide angle X-ray diffraction and morphological properties of the base MPANYC and NYC resins and their corresponding morphology present in the blow-molded bottles were investigated.     

Lipase-catalyzed alcoholysis of triglycerides for short-chain monoglyceride production

Lipase from Pseudomonas fluorescens efficiently catalyzed the alcoholysis of various TG in dry alcohols. For TG with short-chain FA, more MG were accumulated. The yields of MG were affected by the alcohols used. The maximum yields of MG were as follows: 85% for monoacetin in n-butanol, 96% for monobutyrin in ethanol or n-butanol, 50% for monocaprylin in n-butanol, 48% for monolaurin in isopropanol, and 45% for monopalmitin in isopropanol. The MG produced were judged to be 2-MG by TLC analysis. The presence of organic cosolvent affected the reaction rate of the lipase-catalyzed alcoholysis of TG. For the alcoholysis of various TG in ethanol and cosolvent (1∶1, vol/vol), the rates had the following orders: (i) for tributyrin, hexane > toluene > acetone > ethyl acetate > chloroform > acetonitrile > pyridine; (ii) for tricaprylin, hexane > acetone > toluene > acetonitrile > ethyl acetate > pyridine > chloroform; and (iii) for trialurin, hexane > acetonitrile=acetone > ethyl acetate > pyridine=chloroform > toluene.     

Game-based creativity assessment system: the application of fuzzy theory

“Creative development” and “creativity” have become important topics in the field of education research. The assessment of creativity is a key to understanding how instructional strategies influences the creative process and the output of learners. At present, most methods of assessing creativity are paper-and-pencil tests scored by individuals. Despite the professional training of evaluators, subjectivity in scoring assessments remains inevitable. Therefore, a completely objective tool of measurement is crucial for the progress of education to eliminate the subjectivity in manual grading. This paper presents at first place a review of the literature related to the development of creativity, the assessment of creativity, and further on the means of measuring creativity, particularly in a digital game environment. Our focus is on the application of computing technologies for the assessment of creativity, while exploring the possibility of using computerized systems such as fuzzy logic and hybrid methods to produce objective measurement results. The results of Pearson correlation coefficient between the fuzzy inference scores and the Williams CAP scores is 0.805, which shows the strong construct validity. Additionally, the fuzzy inference system can eliminate subjectivity in scoring and provide analysis results to enhance creativity, unlike paper-and-pencil scores provided without explanations.     

Particle Size Effects of Silicon Carbide on Wear Behavior of SiC<Subscript>p</Subscript>-Reinforced Magnesium Matrix Composites

This article investigated the particle size effect of micro-sized SiC on the tribological behavior of SiC_p-reinforced AZ91D Mg-based metal–matrix composites (MMCs). The Mg MMCs were prepared by the melt-stirring technique for wear tests. The hardness and coefficient of friction of Mg MMCs increases as particle size of SiC particle in MMCs increases, except for the hardness tendency at the region between particle size of 11 and 15 μm. The SiC_p/AZ91D MMCs exhibit superior wear resistance under lower and moderate sliding condition. However, the effects of the SiC particle reinforcements on wear resistance are not as conclusive under severe sliding condition, since the matrix of MMCs were softened at elevated temperature under such a severe condition.     

Quantum dialogue protocols immune to collective noise

This work proposes two quantum dialogue protocols, each of which is robust against one of the following two kinds of collective noise: collective-dephasing noise and collective-rotation noise. Both quantum dialogue protocols are constructed from four-qubit DF states that consist of two Bell states. The receiver simply performs two Bell state measurements to obtain the secret message. Moreover, the proposed protocols are free from information leakage because some shared private quantum states are established in the new protocols to allow the legitimate users to exchange their secret messages securely.     

GDDR4小宇宙爆发显存换代进行时

芯片厂商不断提升运行频率,促使显存频率保持高增长以符合硬件的发展。随着2006年首片采用GDDR4显存的显卡Radeon X1950XTX上市以来,GDDR4显存正式与消费者见面。和GDDR3的普及一样,目前GDDR4逐渐步入成熟阶段,因此我们可以看到不少采用GDDR4显存的显卡出现在市场上,尤其是HD3870诞生后,更是将GDDR4全面推向舞台,加上目前显存频率已经发展到超越2000MHz的局面,可以预见2008年GDDR4显存将会完全爆发,最终成为显卡主流配置。     

Generation of droplets with different concentrations using gradient-microfluidic droplet generator

This study successfully uses the micro-mixers and flow-focusing devices, which are integrated into a gradient-microfluidic droplet generator, to generate the different sizes of the droplets with different concentrations simultaneously and applies these microcapsules for drug release. The sizes of these four types of droplet with different concentrations are uniformity with a coefficient of variation less than 5% and can be precisely controlled by adjusting the water phase flow rate and oil phase flow rate. Moreover, Ca-alginate microcapsules with different concentrations of the bovine serum albumin are used for uniform size drug release, and the Ca-alginate microcapsule size is from 60 to 105 μm in diameter. This developed microfluidic chip has the advantages of actively controlling the droplet diameter, simultaneously generating uniform-sized droplets with different concentrations, and having a simple process and a high throughput. This preparation approach for Ca-alginate microcapsules of four different concentrations will provide many potential applications for drug delivery and pharmaceutical area.