Materials Literature
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A new composite of TiO2 (P25) and N-doped carbon quantum dots (P25/NCQD) was prepared by a hydrothermal method and was used for the first time as catalyst of the photo- oxidation of NO under UV and visible light irradiation. P25/NCQD composite exhibited a NO conversion (27.0%) more than two times higher of that observ…
El Laboratorio Secundario de Calibracion Dosimetrica (LSCD) de Venezuela en conjunto con el Laboratorio de Termoluminiscencia del Centro de Investigacion en Ciencias Atomicas Nucleares y Moleculares (CICANUM) de Costa Rica, realizo un ejercicio de comparacion en terminos de Hp(10), Hp*(10), Hp(0,07) con fotones de 0,6…
El Centro de Investigacion en Ciencias Atomicas, Nucleares y Moleculares de la Universidad de Costa Rica tiene a su custodia una importante cantidad de fuentes radiactivas, las cuales se resguardan en zonas controladas y se monitorizan constantemente para la proteccion del trabajador y el ambiente. Las dosis de radiac…
Heat treatment applied on whey proteins solutions causes protein denaturation and induces the formation of aggregates of different sizes and shapes depending on the experimental conditions. Even if cold gelation of whey protein aggregates is well known [1], their role in emulsions and their interfacial properties are…
以顺-4-环己烯-1,2-二羧酸（chedc）、3,5-二（4-吡啶基）-1,2,4-三氮唑（4,4＇-bpt）、六水合硝酸钴为原料,通过室温条件下自然挥发得到一个单核Co（II）的配合物[Co（chedc）（4,4＇-bpt）_2（H_2O）_3]NO_3·H_2O（1）,其结构经IR、元素分析、X-射线单晶衍射进行表征.晶体属单斜晶系,空间群P21/c,晶胞参数a=1.198（2）nm,b=1.361（3）nm,c=2.202（4）nm,β=92.65（3）°,V=3.584（12）nm3,Z=4,Dc=1.499 g·cm-3,F（000）=1676,R1=0.0627,ωR2=0.1190.
O estudo dos polímeros e suas propriedades são incentivados pela ampla utilização desses tipos de materiais nos mais diversos setores de atividade econômica. O objetivo desta avaliação foi identificar as propriedades mecânicas das blendas poliméricas com corpos de PEBD/EVA nas proporções 70/30, respectivamente, e 50/5…
\nW artykule zaprezentowano zastosowania technologii napawania łukowego z wykorzystaniem niskoenergetycznego procesu CMT (Cold Metal Transfer) na przykładzie wzdłużnego napawania ścian gazoszczelnych oraz obwodowego rur przeznaczonych do pracy w podwyższonych temperaturach z wykorzystaniem stopu Inconel 625. Przedstaw…
DMT 생산과정의 부산물로서 폐기 처리되어 왔던 MFB를 출발 물질로 하여 고급 형광증백제 중의 하나인 4,4'-bis(2-benzoxazolyl)stilbene (BBS) 합성을 4단계를 거쳐 총 수율 73%의 경쟁력 있는 공정개발을 수행하였다. 제시된 합성법은 MFB와 ethyl 4-((diethoxyphosphoryl)methyl)benzoate (1)과 반응시킨 후, coupling 생성물 4,4'-stilbenedicarboxylate (2)를 얻고 이를 4,4'-stilbenedicarbonyl chloride (3)으로 변환 후 BBS 합성의 핵심 단계…
본 연구에서는, 실제 $150000Nm^3/hr$ 규모의 연소로에서 운전된 $VO_x/TiO_2$ SCR 촉매의 활성저하 원인을 규명하고자 XRD, BET, AES ICP, $H_2$ -TPR, $NH_3$ -TPD 분석을 수행하였다. $TiO_2$ 의 상전이 및 $VO_x$ 의 결정화가 발생하지 않았기 때문에 열에 의한 촉매의 활성저하는 없는 것으로 나타났다. 반면, 성분 분석결과 S의 함량이 검출되지 않고 Ca이 다량 검출됨에 따라 $SO_2$ 에 의한 피독이 아닌 Ca에 의한 피독이 발생하였음을 확인하였으며 이러한 Ca의 피독은 $NH_3$ 의 흡착량을 감소시…
Background and aims: X-band with 8-12.5 frequencies range has various applications such as air control traffic, navy communication etc. Uncontrolled exposure with microwave can lead to adverse effect on workers. Currently, application of the shielding is a superior control for prevention of microwave exposure. This st…
The influence of titania nanorods with an average diameter of 10 nm and an average length of 30 nm on the electrohydrodynamic instability of block copolymer (polystyrene-b-poly(2-vinylpyridine)) thin film was investigated in this article. The presence of titania nanorods increased the dielectric constant of the film,…
In this paper, we employ the properties of metamaterials to tailor the modes of metamaterial-dielectric waveguides operating at optical frequencies. We survey the effect of fishnet metamaterial structural parameters such as the magnetic oscillation strength, magnetic resonance frequency and magnetic damping on the dou…
We present a systematic analysis of molecular oxygen (O$_2$) adsorption trends on bimetallic PtNi clusters and their monometallic counterparts supported on MgO(100), by means of periodic DFT calculations for sizes between 25 up to 58 atoms. O$_2$ adsorption was studied on a variety of inequivalent sites for different…
The integration of nanomaterials with biology is finding wide applicability in various areas of medical science. Silver has been long recognized as having inhibitory effect on various microorganisms present in medical and industrial processes. But silver nanoparticles (SNPs), when synthesized by wet chemical reduction…
We employ \textit{ab initio} calculations to investigate energetics of point defects in metastable rocksalt cubic Ta-N and Mo-N. Our results reveal a strong tendency to off-stoichiometry, i.e. defected structures are predicted to be more stable than perfect ones with 1:1 metal-to-nitrogen stoichiometry, in agreement w…
Adhesion molecules play an integral role in diverse biological functions ranging from cellular growth to transport. Estimation of their binding affinity, therefore, becomes important to quantify their biophysical impact on these phenomena. In this paper, we use curvature elasticity to present non-intuitive, yet remark…
We investigate numerically the applicability of dynamic facilitation (DF) theory for glass-forming binary hard disk systems where supercompression is controlled by pressure. By using novel ecient algorithms for hard disks, we are able to generate equilibrium supercompressed states in an additive non-equimolar binary m…
Shaping of self-assembled soft materials is of interest for material science and nanotechnology applications because it can provide a flexible and easy method to obtain a single domain in a large area, which is used in opto-electronic and patterning applications. Here, we fabricated disordered porous structures of liq…
This document establishes standard requirements for aerospace sealants and adhesion promoters, which may be incorporated as part of Aerospace Material Specifications (AMS) for such products. This document provides for commonality of methods and procedures for responsibility for inspection, source inspection, classific…
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