Materials Literature
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The yield of hemp dry matter in Latvia's agro-climatic conditions depending on the variety accounted for an average of 7.4 - 12.4 t ha-1. Dependence on the version being subject to inspection, the yield of dry matter for variety 'Futura' was 11.0 to 12.4 t ha-1, 'Bialobrzeskie' - 9.5 to 10.7 t ha-1, but for 'Tygra' -…
The specifics of the combustion of micron-sized flaky aluminum powder in mixtures with crystal-line hydrates over a wide pressure range at various mass ratios between aluminum and crystalline hydrate are studied. Limiting conditions of combustion of mixtures regarding the composition and pressure are determined. With…
Development of an austenitic Fe-Cr-Mn-Ni-Mo-Cu-N alloy 216L to substitute AISI 316L for saving a part of expensive nickel and molybdenum is described. Nickel content is reduced by 40% and molybdenum by 25% with the help of nitrogen, manganese and copper additions. Corrosion tests in boiling solutions in a variety of a…
A vulcanized epoxidized natural rubber (ENR) based electrically conductive compound was successfully prepared by using the combination of internal mechanical mixing and open milling devices. This compound was developed based on a formula with at least 73.0 wt % of petro-chemical free ingredients. The vulcanizate of th…
With the development of aviation industry, more and more performance requirements are submitted to aero-engines, and structure response and safety problem of aero-engine is concerned. Overview is made of the recently years full engine vibration response due to blade-off. And summary about case containment and rotor dy…
Successful synthesis of Cu, Co co-doped ZnO film is obtained by sol-gel method. The structural and electrical properties of the sample were investigated. X-ray diffraction spectroscopy analyses indicate that the Co and Cu co-doping can not disturb the structure of ZnO. No additional peaks are observed in the Zn0.99Co0…
A novel ZnO nanoparticles aqueous solution was prepared through a one-step reaction between a modified hyperbranched polymer-PNP and zinc nitrate. During the reaction process, PNP not only acted as the reagent to produce ZnO nanoparticles, but also controlled the size of the synthesized ZnO nanoparticles and stabilize…
Soda-lime-silicate glasses in the compositions of (65-x)SiO2-25Na2O-10CaO-xHo2O3 (where x = 0.0, 0.50, 1.00, 1.50, 2.00 and 2.50 mol % ) were prepared by melt-quenching technique and characterized. The results show that, the absorption spectra of Ho3+ doped in soda-lime-silicate glass correspond with several bands, wh…
The eri-silk was degummed by Alkaline protease,the chemical composition of the eri-silk was analyzed and the internal structure of the retting eri-silk was analyzed by infrared spectral, also the vertical form of the was tested by electron microscopy and using thermal analysis to study the thermal properties of the er…
A large number of experimental and theoretical studies investigating thermal conductivity of both bulk and thin films exist in the literature. For measurement of thermal conductivity of bulk films we have methods like Guarded Hot Plate method, Flash method and for thin films we have methods like Thermo reflectance and…
t is found that the molecular weight of Hydroxy-terminated polybutadiene (HTPB) influences curing behaviors of HTPB/2,4-toluene diisocyanate (TDI) system and the mechanical properties of PBXs. Effects of the molecular weight of HTPB on the viscose viscosity,the cure time, and mechanical properties of polymer were stud…
In this study, the coating layers of IN625 and 301 stainless steel powders were deposited on the AZ80 magnesium alloy substrates by cold-spray technique. The crystal structures, cross-section of the coating layers and anti-corrosion capabilities were examined via XRD, SEM, potentio-dynamic polarization and salt spray…
This research has two objectives. The first objective is to study the effect of assembly process factors on the seal strength of the VRLA battery. The second objective is to find the optimal setting of significant parameters to maximize the seal strength to reduce the defective rate from air leakage defect. This resea…
In this work we systematically review our results about the permanent magnetic materials. We have investigated the structural and magnetic properties of the rare earth-iron based nitrides. Our investigations indicate that the hard magnetic properties of rare earth-iron nitrides are controlled by the domain nucleation.…
Abstract This paper presents the results of the abrasive wear resistance of selected types of nodular cast iron, including ADI, cooperating with quartz sand and 100 grit abrasive paper. It has been shown that carbides in nodular cast iron cause an increase in wear resistance of 6 to 12% depending on the surface fracti…
This paper presents a method of fabricating ZnO nanoparticles coated silk fabrics via a one-step in situ generation and deposition reaction. In this procedure, amino terminated hyperbranched polymer (HBP-NH2) and zinc nitrate were used as the precursors without any other binders. The results indicated that UV protecti…
In this paper, a study of a compact microstrip antenna based on composite right/left-handed (CRLH) metamaterial transmission line is presented. The physical size and operational frequencies of the antenna are determined by the CRLH unit cell. The antenna exhibits monopolar radiation at its fundamental mode of resonant…
Glass system of composition Li2O-Na2O-B2O3: Fe2O3with replacing alkali oxides one by another have been prepared via melt quenching. Further, the samples were characterized by X-ray diffraction. XRD studies have indicated that the prepared samples were amorphous in nature. Dielectric properties (constant ε , loss tan δ…
We present the results of theoretical and experimental investigations for different types of chiral and achiral frequency selective polarization converters designed for sub-THz band. The converters are implemented as planar bilayer metastructures and exhibit good performance versus alternative polarization converting…
, an endemic medicinal plant of the Moroccan North, were extracted with the soxhlet apparatus using the following solvents: petroleum ether, hexane, chloroform and methanol. The results showed that aqueous and methanol 80 % extracts were very effective to control the growth of the fungus with 100% of the inhibition pe…