Reducing the power consumption of household refrigerators through the integration of latent heat storage elements in wire-and-tube condensers

This study evaluates the influence of latent heat storage elements on the condenser temperature of a commercial household refrigerator. In order to determine the power consumption and the temperature distribution, a standard wire-and-tube condenser is equipped with different heat storage elements (containing water, paraffin or copolymer compound). The results indicate that particularly the application of phase change materials (PCM) lowers the condenser temperature, which leads to a significantly reduced power consumption.     

Q235-A钢管弯曲回弹角建模与分析

分析Q2 3 5—A钢管弯曲回弹过程 ,利用残余应力分布规律、静力矩平衡条件、变形协调条件等回弹理论推出回弹曲率和回弹角的计算公式 ,计算其回弹角并与实测值比较。比较结果表明 ,弯曲角度和弯曲半径与管子直径比值改变时 ,误差不同。在一定条件下 ,误差在 5 %以内     

The use of data mining to classify Carménère and Merlot wines from Chile

The identity of the Carménère variety was lost in Chile and regarded as a Merlot grape. This grape disappeared in Bordeaux, France, the country of origin of the grape, because of the phylloxera plague. In the present paper, a study on the classification of Chilean Carménère and Merlot wine samples based on chemical parameters was carried out. A total of 64 samples were analysed, and 20 chemical parameters were determined. Forty‐five samples were labelled as “Carménère” and 19 samples as “Merlot” according to the wine label. The samples were preprocessed with sampling algorithms to double the number of Merlot samples to 38 and reduce the Carménère samples to 38. The dataset was analysed with the data mining techniques support vector machines and correlation‐based feature selection. The capability of classifying the samples with all 20 chemical parameters was 86.8% accurate, and when using only the variables a*, total anthocyanins, cyan‐3‐glu, malv‐3‐acetylglu, peon‐3‐acetylglu, and vitisin A, which were selected through correlation‐based feature selection, accuracy increased to 93.4%. Therefore, wine anthocyanins and the parameter a* of wine colour proved useful to discriminate the wines.     

Programmable Liquid Adhesion on Bio‐Inspired Re‐Entrant Structures

Surfaces combining antispreading and high adhesion can find wide applications in the manipulation of liquid droplets, generation of micropatterns and liquid enrichment. To fabricate such surfaces, almost all the traditional methods demand multi‐step processes and chemical modification. And even so, most of them cannot be applied for some liquids with extremely low surface energy. In the past decade, multiply re‐entrant structures have aroused much attention because of their universal and modification‐independent antiadhesion or antipenetration ability. Unfortunately, theories and applications about their liquid adhesion behavior are still rare. In this work, inspired by the springtail skin and gecko feet in the adhered state, it is demonstrated that programmable liquid adhesion is realized on the 3D‐printed micro doubly re‐entrant arrays. By arranging the arrays reasonably, three different Cassie adhesion behaviors can be obtained: I) no residue adhesion, II) tunable adhesion, and III) absolute adhesion. Furthermore, various arrays are designed to tune macro/micro liquid droplet manipulation, which can find applications in the transportation of liquid droplets, liquid enrichment, generation of tiny droplets, and micropatterns.     

基于未确知测度的爆破效果综合评价研究

针对实际工程中评价爆破效果的因素指标不确定性问题,通过引入未确知测度理论,建立了基于未确知测度的爆破效果综合评价模型,并结合某露天铁矿深孔台阶爆破的实际情况,对爆破效果进行了基于未确知测度理论的综合评价。评价结果表明:基于未确知测度的爆破效果综合评价模型在各评价指标权重和识别准则的确定上,分别采用了信息熵和置信度识别准则,避免了模糊数学、层次分析法以及灰色关联理论等评判方法在这些方面的不足,使评价结果更具客观性;其评价指标可根据实际情况灵活选取,评价模型计算简单,评价结果能够为爆破工作者根据现场实际情况,适时调整爆破方案,为实现最优的爆破施工与管理提供决策依据。     

Finding the key length of a Vigenère cipher: How to improve the twist algorithm

Abstract

A Vigenère cipher applies a single short key repeatedly to encrypt a plaintext. If a cryptanalyst correctly finds out the key length, the ciphertext can be divided into multiple instances of shift cipher and be broken by frequency analysis. To determine the key length, the twist algorithm, an alternate method to the standard Kasiski and Friedman tests, was recently proposed. In this article, we propose the twist⁺ algorithm, an improved twist algorithm, which can estimate the key length more accurately than the original twist algorithm.     

A New Revocable and Re-Delegable Proxy Signature and Its Application

与云计算和活动应用软件的流行,象联机音乐或听觉的流并且车辆订那样的按需的服务现在是广泛地可得到的。以便允许服务的有效交货和管理为大规模按需的系统,通常有一个层次,服务供应商能托付它的服务到在哪儿一最高级(例如,全国) 代理然后能进一步托付服务到底层(例如,区域宽) 代理。安全(re-) 代表团和撤回在为如此的系统的最关键的因素之中。在这份报纸,我们为完成重新代表团和撤回利用代理签名调查实际答案。尽管代理签名广泛地在文学被学习了,没有以前的答案能完成两个性质。充满差距,我们介绍支持有效撤回并且允许一位代理签名人到的可撤回、 re 可以委托的代理签名的观点重新托付它没有和原来的签名人的相互作用的另外的代理签名人的签名权利。我们为这新原语定义正式安全模型并且介绍能完成所有安全性质的一个有效计划。我们也介绍一安全联机可撤回并且重新托付作为我们的建议计划的应用程序之一订系统(RRVOS ) 的车辆。