Materials Literature
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Lamella flower-like ZnO was prepared in a large-scale via a simple wet chemical method at room temperature(25 ℃) using polyvinylpyrrolidone(PVP) as template and zinc nitrate and sodium hydroxide as source materials. The effects of experimental parameters such as the amounts of reagents, the reaction time and temperatu…
A novel anionic epoxy emulsifier EP-D was synthesized by epoxy resin E-44, 2-amino-5-sulfobenzoic acid, ethylene glycol monobutyl ether and butyl alcohol. Nonionic epoxy emulsifier EP-PEG was synthesized from E-44 and poly(ethylene glycol)(PEG6000) with molar ratio of 2∶1. EP-D/EP-PEG composite emulsifiers were obtain…
Fiber reinforced concretes possess high strength under dynamic loadings, which include impact loads, thanks to their high structural viscosity. This is the reason for using them in difficult operating conditions, where increasing the performance characteristics and the structure durability is of prime importance, and…
In view of providing durability of constructions, the urgent problem is studying dynamic processes in loaded rod structures occurring in the process of sudden local defects formation, such as breakage of support bonds, partial destruction, transverse and longitudinal cracks etc., which are united under general term "b…
This paper deals with leak detection in liquid transmission pipelines. Diagnostic method based on negative pressure wave detection is taken into account here. The paper focuses on variant of this method, related to the use of only two measurement points (devices), placed at the inlet and outlet of the pipeline. Standa…
The influence upon chemical composition and heat of combustion of composite propellant that occurs as a result of substitution of aluminium by its hydride AlH3 is investigated. Propellants based on ammonium chlorate(VII) (NH4ClO4) modified by standard HTPB binder are considered. Chemical composition and thermodynamic…
The article presents design and testing methods of layered perforated steel armour developed by HTK Company and Military Institute of Armament Technology, which can be used as add-on-armour of vehicles and other light armoured objects. Armour configurations differing in number and thickness of layers (steel plates), s…
Rectangular cross-section specimens with different section thicknesses were prepared to study the influences of pouring temperature, mould temperature and squeeze velocity on the fluidity of squeeze cast AZ91D magnesium alloy by means of orthogonal test design method. The results show that pouring temperature, mould t…
Bu çalışmada sezgisel armoni araştırma optimizasyon tekniği ile Türkiye'de çoğunlukla tek katlı olarak inşa edilen prefabrik endüstri yapıların tasarımının yapılabildiği bir çözüm yaklaşımı geliştirilmiştir. Çalışmada, 6 metre yüksekliğinde ve 3 açıklığa sahip tipik bir prefabrik bina Deprem Yönetmeliği ve Türk Standa…
Allowing (Cy2NH2)2.SO4.2H2O or Cy2NH2.HSO4 to react with SnMe3Cl in ethanolic media in two specific ratios the sulphato complexes (mentioned in this paper title) were obtained and their infrared study was carried out. Discrete structures containing the complex-anion [SO4(SO4SnMe3)2]4- consisting of a central bidentate…
A simple experimental model for determination of the running and average nominalcompressive strain, [i]ε[sub]r[/sub][/i]([i]x[/i]) and [i]ε[sub]a[/sub] [/i]in the ductile porous rod, plasticly deformed during Taylor test, has been presented in this paper. It is revealed that in the axial distribution of the strain [i]…
The tests results of 7,62x51 mm model rounds with newly developed bullets with higher penetration abilities are presented in this paper. The rounds with two bullets configurations based on steel core were compared to standard ball round. Obtained results and presented conclusions let to indicate courses of further wor…
The technology of production of porous powder materials with frame structure on the basis of spherical particles of titan powder by means of applying on them technological coverings (Si + Mo) + C with the thickness up to 2 mm is developed. Formation of powders with covering was carried out in the mold at pressure belo…
Abstract This article describes traditional methods for identifying particle contamination in manufacturing processes as well as a new alternative method that uses scanning electron microscopy combined with energy-dispersive x-ray spectroscopy. The new system provides efficient, accurate microanalysis to identify the…
In this study, a novel three-dimensional porous scaffold was fabricated from nano particles (CaCO3) with the micro-macro architecture for the purpose of bone repair, and their material properties were evaluated in vitro. Ideally, scaffold should have the following characteristics: biocompatible and biodegradable, suit…
The article presents preliminary results of investigation on morphology (AFM, FTIR) of boron nitride thin films deposited onto steel substrates using PLD method. Mechanical properties (hardness and elastic modulus) of the coatings and their adhesion to the substrates were measured.On the basis of obtained results, the…
Purpose. The main requirements for the design of a new generation of cars, according to the Program of rolling stock renovation, are the requirements reducing the operating costs and increasing the cost-effectiveness of their use, taking into account the achievements of scientific and technical thought. Due to the urg…
This article shows the distinctive features of concrete working in the conditions of uneven loading and presents the diagrams of confined concrete deformations. The influence of the loading shape on the floor working in pressing-through is shown. The force distribution of different variants of temporary and long-term…
The proposed calculation method is specific in terms of determining the carrying capacity of eccentrically compressed concrete elements, in contrast to the calculation by error method, as in the existing regulations, where in the result of the calculation is not known what is the limit load the eccentric compression e…
The paper highlights problems associated with the witness testimony of forensicconstruction experts in court, approaches and techniques for e"ective upholding ofexpert opinion, and various aspects of the expert's polemics with opponents in a con#ictsituation.