Euclid’s Elements in the Czech Lands

[Terentianus 1st – 2nd century A.D.]

This article is dedicated to Euclid’s Elements, to translations of this work into Czech, and to the translators who have taken on the task of translation. It contains a short overview of the results achieved during a three-year project supported by the Czech Grant Agency.We explored how Euclid’s Elements were spread around the Czech lands.We will try to describe the circumstances that lay behind attempts to translate the Elements into the Czech language.     

A review of drop size measurement in fuel sprays

A detailed review of selected drop size measurement techniques capable of application to practical combustion systems is presented. Attention is restricted to those methods producing quantitative drop size frequency distributions and methods yielding mean spray characteristics are ignored. Comment on the relative merits and restrictions of each method, together with its applicability to particular situations, is made. Some of the techniques described can be applied to measurement of angle of flight and velocity of drops, in addition to their size, in both burning and isothermal sprays. Some indication of future technological advances in the field of drop size measurement is given.     

Behavioural models for distributed Fractal components

This paper presents a formal behavioural specification framework for specifying and verifying the correct behaviour of distributed Fractal components. The first contribution is a parameterised and hierarchical behavioural model called pNets that serves as a low-level semantic framework for expressing the behaviour of various classes of distributed languages and as a common internal format for our tools. Then, we use this model to define the generation of behavioural models for applications ranging from sequential Fractal components, to distributed objects, and finally to distributed components. Our models are able to characterise both functional and non-functional behaviours and the interaction between the two concerns. Finally, this work has resulted in the development of tools allowing the non-expert programmer to specify the behaviour of his components and (semi)automatically verify properties of his application.     

静电放电人体模型测试标准EIA/JEDEC中的问题研究

通过具体的实例说明目前的静电放电（Electrostatic Discharge,ESD）人体模型测试标准EIA／JEDEC尚存在一些需要完善的问题。目前的标准EIA／JEDEC中缺少对起始测试电压的规定,导致有些测试直接从千伏（kV）量级的高压开始进行,造成一些设计不良的ESD防护器件在低压发生失效的状况可能被漏检的后果。本文研究对象为一个漏端带N阱镇流电阻（Nwell-ballast）的GGNMOS（Gate-Grounded NMOS）型ESD防护结构。用Zapmaster对它做人体模型（Human Body Model,HBM）测试,发现从1Kv起测时,能够通过8Kv的高压测试;而从50V起测时,却无法通过350V。TLP测试分析的结果显示此现象确实存在。本文详细剖析了该现象产生的机理,并采用OBIRCH失效分析技术对其进行了佐证。因该问题具有潜在的普遍性,因此提出了对目前业界广泛采用的EIA／JEDEC测试标准进行补充完善的建议。     

粉煤灰在烧结砖中应用的思考及建议

探讨烧结粉灰砖及高掺量粉煤灰烧结砖的定义,产品定位,保温性能,指出由于标准的缺失给高掺量粉煤灰烧结砖带来的困惑,并提出建议.     

合成阻垢剂研究现状及展望

合成聚合物阻垢剂是水处理剂的一种,广泛运用于工业循环冷却水系统中.本文主要论述了合成阻垢剂的种类及国内外发展的现状,指出了合成阻垢剂发展的重点和方向,并提出其今后发展的一些建议.其中聚天冬氨酸和聚环氧琥珀酸两大新型绿色合成阻垢剂成为近几年国内外研究重点.     

Un environnement de conception de systèmes distribués basé sur UML

This paper introduces a new environment for developing distributed systems. It is based on theTurtle uml profile. Analysis and design phases, described in previous papers, have been extended with an additional deployment phase. In this new step,Turtle components are deployed over hardware execution nodes, and nodes are connected together throughout links,Turtle deployment diagrams are given a formal semantics inRt-lotos, therefore following the approach used forTurtle analysis and design diagrams. Moreover, the paper presents a Java code generator which outputs appropriate Java code forTurtle deployment diagrams. This code is automatically deployable on networks because it implements node communication using network protocols such asUdp orRmi. ttool, the turtle toolkit has been extended to support these new diagrams and code generators. The attack of protected data exchanged throughout securedHttp sessions serves as example.     

BA-166在外保温中的应用

考察了聚合物乳液BA-166的应用性能,同时与同类产品进行了比较。     

Facile modification of polysulfone hollow-fiber membranes via the incorporation of well-dispersed iron oxide nanoparticles for protein purification

Protein existence in wastewater is an important issue in wastewater management because proteins are generally present as contaminants and foulants. Hence, in this study, we focused on designing a polysulfone (PSf) hollow-fiber membrane embedded with hydrophilic iron oxide nanoparticles (IONPs) for protein purification by means of ultrafiltration. Before membrane fabrication, the dispersion stability of the IONPs was enhanced by the addition of a stabilizer, namely, citric acid (CA). Next, PSf–IONP–CA nanocomposite hollow-fiber membranes were prepared via a dry–wet spinning process and then characterized in terms of their hydrophilicity and morphology. Ultrafiltration and adsorption experiments were then conducted with bovine serum albumin as a model protein. The results that an IONP/CA weight ratio of 1:20 contributed to the most stable IONP dispersion. It was also revealed that the membrane incorporated with IONP–CA at a weight ratio of 1:20 exhibited the highest pure water permeability (58.6 L m⁻² h⁻¹ bar⁻¹) and protein rejection (98.5%) while maintaining a low protein adsorption (3.3 μg/cm²). The addition of well-dispersed IONPs enhanced the separation features of the PSf hollow-fiber membrane for protein purification. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47502.     

抗噬菌体嗜热链球菌突变菌株Streptococcus thermophilus-21UD的选育

以高密度噬菌体培养处理嗜热链球菌菌株,筛选出1株噬菌体抗性菌株S-18,但其产酸、产黏、产香能力不如原菌株.通过照射距离20cm,照射时间60s的紫外线诱变和DES振荡70min的复合诱变,得到SUD-21菌株,其产酸力较敏感菌株提高了0.5%,产黏性提高了0.8%,产乙醛能力提高了0.2%,产丁二酮能力提高了0.1%,且具有遗传稳定性和抗109 pfu/mL噬菌体浓度的能力.