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Search Results: 1 - 10 of 117851 matches for " T. Dziubek "
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Geometrical precision of 3DP casting form for founding gears
T. Markowski,G. Budzik,B. Kozik,T. Dziubek
Archives of Foundry Engineering , 2010,
Abstract: The article presents analysis of geometrical precision of casting form made by means of 3DP method. Three dimentional printing is a universal method of rapid prototyping which can be used to make tools – castings forms as a Rapid Tooling method. By means of this method in direct incremental process a casting form of spur gear was created. Precision of creating the form by 3DP method depends on different factors. Technological factors depending on machine operator include: the thickness of the layer and placing the model in working space. The precision of creating the model also depends on preparing the printer for work: the condition and calibration of printing heads, the condition of the printing unit slide guides and preparing the working space. Three dimentional printer Z510 Spectrum was prepared for work in a way assuring the greatest precision of created models. Technological parameters responsible for precision were set on maximum values. The aim of the research was defining the precision of casting form generated by 3DP Rapid Prototyping Method. The research was made by means of coordinate measuring machine Wenzel LH87. The measuring machine software was used to compare the outcome of the measurement to nominal model 3D-CAD. The problem of tool precision of casting forms generated by Rapid Tooling is rarely considered in literature covering rapid prototyping and casting technologies. That is why the research presented in this article isan original work in the technological and practical aspect.
Rapid Prototyping of wax foundry models in an incremental process
B. Kozik,G. Budzik,T. Dziubek,M. Grzelka
Archives of Foundry Engineering , 2011,
Abstract: The paper presents an analysis incremental methods of creating wax founding models. There are two methods of Rapid Prototypingof wax models in an incremental process which are more and more often used in industrial practice and in scientific research.Applying Rapid Prototyping methods in the process of making casts allows for acceleration of work on preparing prototypes. It isespecially important in case of element having complicated shapes. The time of making a wax model depending on the size and the appliedRP method may vary from several to a few dozen hours.
Reduced Effective Model for Condensation in Slender Tubes with Rotational Symmetry, Obtained by Generalized Dimensional Analysis
Andrea Dziubek
Physics , 2011,
Abstract: Experimental results for condensation in compact heat exchangers show that the heat transfer due to condensation is significantly better compared to classical heat exchangers, especially when using R134a instead of water as the refrigerant. This suggests that surface tension plays a role. Using generalized dimensional analysis we derive reduced model equations and jump conditions for condensation in a vertical tube with cylindrical cross section. Based on this model we derive a single ordinary differential equation for the thickness of the condensate film as function of the tube axis. Our model agrees well with commonly used models from existing literature. It is based on the physical dimensions of the problem and has greater geometrical flexibility.
Equations for two-phase flows: a primer
Andrea Dziubek
Physics , 2011,
Abstract: The main goal of these notes is to give a review of the equations for two phase flow problems with an interface between the two phases in a self-contained way, and, in particular, to properly include surface tension into the interface balance equations.
Comparative chloroplast genomics: analyses including new sequences from the angiosperms Nuphar advena and Ranunculus macranthus
Linda A Raubeson, Rhiannon Peery, Timothy W Chumley, Chris Dziubek, H Matthew Fourcade, Jeffrey L Boore, Robert K Jansen
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-174
Abstract: The Nuphar [GenBank:NC_008788] and Ranunculus [GenBank:NC_008796] plastid genomes share characteristics of gene content and organization with many other chloroplast genomes. Like other plastid genomes, these genomes are A+T-rich, except for rRNA and tRNA genes. Detailed comparisons of Nuphar with Nymphaea, another Nymphaeaceae, show that more than two-thirds of these genomes exhibit at least 95% sequence identity and that most SSRs are shared. In broader comparisons, SSRs vary among genomes in terms of abundance and length and most contain repeat motifs based on A and T nucleotides.SSR and SDR abundance varies by genome and, for SSRs, is proportional to genome size. Long SDRs are rare in the genomes assessed. SSRs occur less frequently than predicted and, although the majority of the repeat motifs do include A and T nucleotides, the A+T bias in SSRs is less than that predicted from the underlying genomic nucleotide composition. In codon usage third positions show an A+T bias, however variation in codon usage does not correlate with differences in A+T-richness. Thus, although plastome nucleotide composition shows "A+T richness", an A+T bias is not apparent upon more in-depth analysis, at least in these aspects. The pattern of evolution in the sequences identified as ycf15 and ycf68 is not consistent with them being protein-coding genes. In fact, these regions show no evidence of sequence conservation beyond what is normal for non-coding regions of the IR.In this paper we report the complete chloroplast genome sequences of the angiosperms Nuphar advena (Nymphaeaceae) and Ranunculus macranthus (Ranunculaceae). The Nymphaeaceae is placed very near or even at the base of extant angiosperms [1-6], whereas the Ranunculus chloroplast genome represents the basal-most eudicot characterized to date [4,5]. Thus we add to the small number of genomes not representing monocots or crown eudicots, increasing our ability to compare genomes across all angiosperms and determine general
REGULARYFRAMWORK AND LEGAL BASE OF ELECTRONIC DOCUMENT CIRCULATION НОРМАТИВНО-ПРАВОВА БАЗА ЕЛЕКТРОННОГО ДОКУМЕНТООБ ГУ
T.Г. Омельченко,Н.А. Джанджгава
Information Technologies and Learning Tools , 2010,
Abstract: The general characteristic of legal base of electronic document circulation is presented in the article. It legislatively regulates the relations which connected with the information and information communication technologies. There is presented the list of the basic acts of regulation of sphere of information relations. У робот подано загальну характеристику нормативно-правово бази, яка законодавчо регулю в дносини, пов'язан з нформац ю, нформац йно-комун кац йними технолог ями, представлено перел к основних законодавчих акт в регулювання сфери нформац йних в дносин.
THE APPROACH OF COMPETENCE AT THE STUDY OF MATHEMATICAL INFORMATICS IN A PEDAGOGICAL UNIVERSITY КОМПЕТЕНТН СНИЙ П ДХ Д ПРИ ВИВЧЕНН МАТЕМАТИЧНО НФОРМАТИКИ” У ПЕДАГОГ ЧНОМУ УН ВЕРСИТЕТ
T.П. Кобильник
Information Technologies and Learning Tools , 2010,
Abstract: In the paper the approach of competence at the study of mathematical informatics in a pedagogical university is considered. The special attention is paid to forming of professional pedagogical and educational-cognitive competences. The example of tasks on which formed a competence at the study of mathematical informatics is resulted. У статт розглянуто компетентн сний п дх д при вивченн математично нформатики у педагог чному ун верситет . Особливу увагу звернено на формування профес йно педагог чно та навчально-п знавальну компетентност . Наведено приклад завдань, як сприяють формуванню компетентностей при вивченн математично нформатики.
SYSTEM OF THE AUTOMATIC DOCUMENT PROCESSING IN SHELL OF BASE SOFTWARE СИСТЕМА АВТОМАТИЗОВАНОГО ДОКУМЕНТООБ ГУ В ОБОЛОНЦ БАЗОВОГО ПРОГРАМНОГО ЗАБЕЗПЕЧЕННЯ
В.Ю. Биков,T.О. Дерба
Information Technologies and Learning Tools , 2010,
Abstract: In the article the automatic system of the document processing, created with use of Microsoft Access – a component part of Microsoft Office is offered. This system can be used at school and Institutions of education with one computer or with system of 15 ones connecting in the local net. У статт запропоновано для ознайомлення автоматизовану систему документооб гу, створену з використанням Microsoft Access – складово частини Microsoft Office. Ця система може використовуватися в школах установах осв тньо галуз на одному комп’ютер чи на систем до 15 комп’ютер в, пов’язаних локальною мережею.
MODERN APPROACHES AND PRINCIPLES OF PORTAL BUILDING ТЕХНОЛОГ ЧН ОСНОВИ СТВОРЕННЯ ТА П ДТРИМКИ ПОРТАЛ В
Н.Т. Задорожна,T.Г. Омельченко
Information Technologies and Learning Tools , 2010,
Abstract: The paper presents the analysis of modern state of development and use of Internet portals, the peculiarities of approaches to creation and introduction of portals in educational system are described. В робот анал зуються принципи розробки та використання нтернет-портал в, описуються особливост п дход в до створення та впровадження портал в у систему осв ти.
REVIEW OF MODERN TOOLS OF INFORMATION AND COMMUNICATION TECHNOLOGIES IN THE MANAGEMENT OF SECONDARY EDUCATION ОГЛЯД СУЧАСНИХ ЗАСОБ В НФОРМАЦ ЙНО-КОМУН КАЦ ЙНИХ ТЕХНОЛОГ Й В УПРАВЛ НН СЕРЕДНЬОЮ ОСВ ТОЮ
T.О. Дерба
Information Technologies and Learning Tools , 2010,
Abstract: There are presented the up-to-date situation with information and communication technology use in the management of secondary education; information and communication technologies (ICT), that practically used in educational establishments are considered. There are some examples of educational institutions using IСT for the automation of management. У статт показаний зр з сучасного стану використання нформац йно-комун кац йних технолог й в управл нн середньою осв тою, розглянут нформац йно-комун кац йн технолог ( КТ), як на практиц використовуються в загальноосв тн х закладах, наведен в дгуки навчальних заклад в, як використовують КТ для автоматизац управл ння
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