Оценка технико-экономической эффективности разработки ракет-носителей с многоразовыми блоками первых ступеней
The paper presents a method of assessing technical and economical efficiency of developing carrier rockets with first-stage reusable units.
Materials Literature
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YOUNG-LAPLACE EQUATION IN CONVENIENT POLAR COORDINATES AND ITS IMPLEMENTATION IN MATLAB®
A new form of expression for the\nYoung-Laplace equation is proposed.\nThe Young-Laplace equation is developed\nin a convenient polar coordinate\nsystem and programmed in MatLab®.\nThe profile generated showed to be in\nagreement with those reported in literature.\nAn algorithm that avoids profile interpolation\nwas d…
ANALISA PENGARUH QUENCHING DENGAN VARIASI PENDINGINAN AIR DAN OLI PADA GERGAJI PITA DAN SERKEL TERHADAP STRUKTUR MIKRO, KEKERASAN DAN KEAUSAN PERMUKAAN
ANALISA PENGARUH QUENCHING DENGAN VARIASI PENDINGINAN AIR DAN OLI PADA GERGAJI PITA DAN SERKEL TERHADAP STRUKTUR MIKRO, KEKERASAN DAN KEAUSAN PERMUKAAN ABSTRAKSI Tujuan penelitian ini adalah untuk mengetahui hasil uji, yaitu komposisi kimia, pengamatan struktur mikro, harga kekerasan, harga keausan gergaji pita dan se…
Исследование устойчивости фронта дендритной кристаллизации сварочно-наплавочного шва как динамической системы
The article studies the problems of kinetics of dendrite growth in alloys in the overcooled area in conditions of formation of concentrated oversaturation by admixture. The possibility of existing processes as auto vibrations at dendritic crystallization and features of kinetics of dendrite growth depending on cluster…
Прогнозирование упругих свойств полимерных композиционных материалов
In this work the results of experiment defining concentration dependences of elastic modules of two systems of polymeric composites on the volume fraction of filling compound. As the results of modeling for the same systems the comparative analysis is presented.
W6Sin^0,±（n=1,2）团簇结构与电子性质的密度泛函理论研究
利用密度泛函理论中的杂化密度泛函B3LYP,在Lanl2dz基组水平上对W6Sin0,±（n=1,2）团簇的各种可能构型进行了几何结构优化,得出了它们的基态构型,并对基态构型的芳香性、磁性及NBO轨道进行了系统的理论分析.结果表明：所有的W6Sin0,±（n=1,2）团簇的基态及亚稳态结构都为立体几何结构,Si-Si之间不成键;aW6Si20,±团簇具有芳香性,其中aW6Si2团簇的芳香性最强;电荷由Si原子向W原子转移;aW6Si1团簇无磁性,aW6Si1＋,aW6Si20,±团簇具有弱的铁磁性,aW6Si1-团簇具有弱的反铁磁性;aW6Si20,±团簇比aW6Si10,±团簇的总磁矩大.
Pengaruh Fraksi Volume Terhadap Kekuatan Bending dan Impak pada Komposit Serat Kulit Kayu Sengon Acak dengan Matrik Polyester BQTN 157
PENGARUH FRAKSI VOLUME SERAT TERHADAP KEKUATAN BENDING DAN IMPAK PADA KOMPOSIT SERAT KULIT KAYU SENGON ACAK DENGAN MATRIK POLYESTER BQTN 157® ABSTRAKSI Tujuan dari penelitian ini adalah untuk mengetahui pengaruh fraksi volume komposit serat kulit kayu sengon bermatrik polyester terhadap sifat bending, impak, dan menge…
Polymer Brushes as Substrates for Microarray Applications
The development of innovative bioanalytical technologies that enable the discovery of new therapeutics or the creation of systems for rapid, accurate and parallel analyses has gained an extraordinary interest in the biomedical sector in the last 10-15 years. Since proteins are the key-targets for such essential discov…
Új, potenciálisan bioaktív szénhidrátok: szintetikus és NMR kutatások = Novel carbohydrates with potential biological activity: synthetic and NMR investigations
Új típusú, 3-kötéses glikozidos hidat (3KGH: -S-S-, -S-C- ) tartalmazó glikomimetikumokat szintetizáltunk. Monoszacharidokat egy központi aromás gyűrűre SS-kötéssel kapcsolva szimmetrikus oligovalens struktúrákat nyertünk. Tioéter (4->6', -S-C-) interglikozidos kiépítésével új típusú pszeudo-diszacharidokat konstruált…
Investigations on the oxidation behaviour of MAX-phase based Ti 2 AlC coatings on gamma-TiAl
In this study the oxidation resistant and MAX-phase based material Ti 2 AlC was investigated as coating material on the γ-TiAl based high temperature alloy Ti-45Al-8Nb regarding the improvement of the oxidation behaviour. The 10 µm thick layer was deposited by low temperature magnetron sputtering. Phase formation was…
Desenvolvimento de novos materiais híbridos nanoestruturados a base de sílica e silsesquioxanos
O desenvolvimento de materiais hbridos organo-inorgnicos a base de slica tm recebido crescente ateno na ltima dcada.Estes materiais apresentam caractersticas dos componentes individuais, como tambm novas e inesperadas propriedades.Um mtodo satisfatrio para se obter esses materiais hbridos a sntese sol-gel, que possibi…
Solid-solid phase transformation kinetics
Chapter 2 of this thesis presents the investigation of the microstructural evolution of Co precipitates formed upon isochronal annealing of an initially supersaturated Au 10.12 at. % Co solid solution. It was proven, that initially plate like bcc Co precipitates have formed, which deviates from the expected stable fcc…
Приближенный аналитический метод расчета стационарного температурного поля цилиндрического резервуара с многослойными стенками
The axisymmetric problem on heat transfer through multilayered walls of the tank in the shape of the direct circular cylinder is considered. The approximate analytical solution of the problem is obtained. The numerical data obtained with its use is compared to results of numerical methods. The new approximate formulae…
Photomovement of Algae – Historical Overview of Research and Current State of the Art
Interest in understanding the mystery surrounding the movement of living organisms dates from ancient times. The first published work in the field [De Motu Animalium (“On the Motion of Animals”)] was by Aristotle (384-322 B.C.) who was interested in similarities in motion among animals. Leonardo da Vinci (1452-1519),…
Исследование надмолекулярной структуры полимеров, полученных на основе ароматических изоцианатов, октаметилциклотетрасилоксана и простого полиэфира
The supramolecular structure of polymers, received on the base of polyether, tolylene 2,4-diisocyanate and octamethylcyclotetrasiloxane, were researched from the measurements of the temperature dependence of dielectric loss tangent. It was established that polytriisoyanurates are the participants of formation of inter…
Методика численного решения неосесимметричных задач нелинейного изгиба пологих оболочек вращения
The author offers a numerical technique for evaluating non-axially symmetric stress-stained state of thin flexible shallow shells of revolution and round plates of variable thickness subjected to the force and temperature loads. The technique is based on the synthesis of methods of finite-differences, matrix run, gene…
Oxidation Behavior of ZrN Thin Films in Vacuum and Nitrogen Enviroments
The objective of this study is to understand the difference of the behaviors of ZrN thin film oxidation in different atmospheres. The annealing atmosphere and temperature were chosen to be the designate variables. In this study, ZrN thin film was deposited on Si substrate, and the samples were annealed in vacuum and f…
Определение осредненного модуля деформации грунтового основания, усиленного выштампованными микросваями, для ленточного фундамента
The offered technique of definition of the average module of deformation of the soil basis strengthened vyshtampovannye by micropiles, to apply to the tape bases. Use of the given technique, on the basis of the accepted assumptions, allows settlement method to predict development a deposit of the strengthened bases at…
Использование металлических частиц различной дисперсности в эластомерных композитах
In work the review of researches on use of highlydisperse particles of metals in elastomeric compositions is given; the basic scopes of such composite materials and prospects of use of ultradisperse particles of metals of variable valency as modifying additives and fillers are shown.
Atomic-level investigation of surface processes governing SiGe wetting layer formation using STM/STS
Upon sub-monolayer Ge deposition on the 2xn reconstructed SiGe alloy wetting layer at room temperature, the predominant adspecies observed are so-called addimer chain structures (ADCSs). Polarity-switching scanning tunneling microscopy (STM) is used to study ADCSs, as they only appear in empty-state images. ADCSs are…