物理防晒剂配方应用

指出了防晒对人体的重要性，并给出了防晒产品提高效能的依据。重点讨论了如何使用TIOVEIL和SPECTRAVEIL分散液来取得最佳的效能，在达到最高的SPF值和UVA防护的同时保证最终产品的稳定和雅致外观。同时还给出了物理防晒产品TIOVEIL和SPECTRAVEIL的配方指导。     

A comparative analysis of evolutionary and memetic algorithms for community detection from signed social networks

To detect communities in signed networks consisting of both positive and negative links, two new evolutionary algorithms (EAs) and two new memetic algorithms (MAs) are proposed and compared. Furthermore, two measures, namely the improved modularity Q and the improved modularity density D-value, are used as the objective functions. The improved measures not only preserve all properties of the original ones, but also have the ability of dealing with negative links. Moreover, D-value can also control the partition to different resolutions. To fully investigate the performance of these four algorithms and the two objective functions, benchmark social networks and various large-scale randomly generated signed networks are used in the experiments. The experimental results not only show the capability and high efficiency of the four algorithms in successfully detecting communities from signed networks, but also indicate that the two MAs outperform the two EAs in terms of the solution quality and the computational cost. Moreover, by tuning the parameter in D-value, the four algorithms have the multi-resolution ability.     

集成电路密封用高纯邻甲酚醛环氧树脂的制备

ECN树脂中的可水解氯含量是决定树脂质量的—个重要指标。本文研究了反应温度、ECH/OCN配比、反应时间和碱用量等因素的影响,取得了规律性的认识,并获得最佳配方,制备出高纯度的ECN树脂系列产品。     

浅谈C语言中循环结构的教学--回答好循环结构的“三个问题”

循环结构是C语言程序设计中的重难点,其掌握情况对于后续章节的学习效果尤为关键。本文以什么是循环、何时需要使用循环以及如何使用循环三个问题为主线,通过精心选择的教学案例和灵活有效的教学方法来进行解答,以激发学生兴趣,培养编程思想。     

板壳式换热器设置膨胀节的判定

介绍板壳式换热器的主要特点和应用。当壳体与板束温差较大时,笔者通过对产品开发的生产实践,提出解决板壳式换热器要否设置膨胀节的类似判定方法。     

Synthesis, isolation, spectroscopic and electrochemical characterization of some calcium-containing metallofullerenes

A few Ca-containing mono-metallofullerenes, i.e. Ca@C₇₆, Ca@C₈₈, Ca@C₉₀ (I, II), were synthesized by an improved DC arc discharge method and isolated by a multi-stage HPLC method for the first time. These isomer-separated metallofullerenes were characterized by LD-TOF MS and UV-vis-NIR spectrometry. Their HOMO-LUMO band gaps and possible molecular geometries are discussed according to the absorption spectra in this report. In addition, the cyclic and differential pulse voltammetry of Ca@C₇₆ was conducted in MeCN/C₆H₅CH₃ (1:4 v/v). The voltammograms of Ca@C₈₂ (II, III) and Ca@C₈₄ (II) were also recorded. Their electrochemical behaviors are discussed compared with those of corresponding ytterbium metallofullerenes. The features of the Ca metallofullerenes’ electronic structures are also discussed.     

德化青花瓷器装饰艺术浅谈

我国福建德化是中国陶瓷文化的发祥地之一,也是我国著名的三大古瓷都之一。德化陶瓷制造历史悠久,瓷质优良,工艺精巧,驰名中外。德化青花瓷器“以白见长”的装饰表现特征,充分地显示出了德化青花瓷器独特的艺术风格和鲜明的地方色彩,其特征在福建青花瓷器中极为突出。德化青花图饰的画面情景交融、虚实相生,它随意、自然、洒脱,它无拘无柬、出神入化,其自由的个性与人文的情怀得以张显和抒发。德化青花瓷器独特的艺术风格和鲜明的地方特色在全国的青花瓷器中非常显著。     

《金银岛》中约翰·西尔弗的角色分析

约翰·西尔弗是小说<金银岛>中的一个重要角色.借助弗洛伊德的"唯乐原则"和"现实原则"分析了西尔弗的所作所为,指出了西尔弗的欲望和无奈的根源.     

Analysis of junction temperatures in high-power GaN-based LEDs

We presented the analysis of the incomplete conduction in bonding medium in high power GaN-based light-emitting diode (LED) packages. A numerical study was carried out with parametric model to understand the junction temperature variation due to bonding medium defects. Transient thermal measurement was performed to evaluate LED’s junction temperature. Thermal resistance from chip to lead frame was 20 K/W in our sample LED. It was suggested that only 60% of the surface area of the bonding medium was involved...