Materials Literature
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Four activated carbon (AC) samples prepared from rice husk under different activation temperatures have been characterized by N2 adsorption–desorption isotherms, thermogravimetric analysis (TGA–DTA), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The specific surface area of AC…
Colloidal nanoplatelets (NPLs) have recently emerged as favorable light-emitting materials, which also show great potential as optical gain media due to their remarkable optical properties. In this work, we systematically investigate the optical gain performance of CdSe core and CdSe/CdS core/crown NPLs having differe…
通过化学共沉淀法制备了 NiCuZn 铁氧体纳米微粒，采用 X 射线衍射仪、透射电镜以及振动样品磁强计分析研究 Mg2＋和 Co2＋共同取代 Ni2＋对铁氧体微观结构和饱和磁化强度的影响。结果表明，适量的Mg2＋和Co2＋取代Ni2＋后，试样依然能够形成单一的尖晶石结构，没有第二相杂质出现；试样的晶格参数a 和平均粒径Dx 随Mg2＋和 Co2＋取代量的增加而增大；透射电镜图片显示试样中有少量多面体形状的颗粒，并且出现团聚现象；饱和磁化强度Ms 随Co2＋取代量的增加单调增大，随Mg 2＋取代量的增加先增大后减小，并且在Mg2＋的取代量为0.05、Co2＋的取代量为0.08时，试样具有最大饱和磁化强度。
采用以尿素为燃料的低温燃烧法一步合成了电解质粉末 Ce0.8 Gd0.2 O1.9（GDC），通过 XRD、TG-DSC、BET、FESEM等手段对合成粉体进行了物相测定、热分析、比表面积测定和形貌观察，并考察了粉体的烧结性能。结果表明，尿素-硝酸盐干凝胶自蔓延燃烧点火温度约为279.0℃。通过工艺参数的有效设计，经过低温燃烧过程即可直接得到立方萤石结构的纯相GDC粉体，该粉体为粒径在20~60 nm的类球形颗粒，粒子间虽有微弱的软团聚，却具有较高的烧结活性，在1300℃仅需烧结2 h 即可达到95.2%的相对密度。该温度比固相法制备该粉体的烧结温度至少降低300℃。
補正完畢
Hasta el siglo XIX el único método efectivo de unir piezas metálicas era el que seguía el herrero mediante la fragua, yunque y el martillo. Fue a principios de ese siglo cuando se introdujo el soplete oxiacetilénico y a finales cuando hicieron los primeros balbuceos con la soldadura eléctrica.
Stainless steel has been used as material for orthopedic and orthodontic implants due to their low cost, good formability and proper mechanical properties. However, stainless steel is susceptible to pitting corrosion in body fluids and have poor wear resistance which limits its applications. Surface coating with certa…
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DNA oxidative damage has long been associated with the development of a variety of cancers including colon, breast and prostate, whilst RNA damage has been implicated in a variety of neurological diseases, such as Alzheimer’s disease and Parkinson’s disease. Radiation damage arises when energy is deposited in cells by…
We present theoretical and experimental study of plasmonic Hetero-Chiral structures, comprised of constituents with opposite chirality. We devise, simulate and experimentally demonstrate different schemes featuring selective surface plasmon polariton focusing of orthogonal polarization states and standing plasmonic vo…
Thermally-activated $\\small{\\nicefrac{1}{2}}<111>$ screw dislocation motion\nis the controlling plastic mechanism at low temperatures in body-centered cubic\n(bcc) crystals. Motion proceeds by the nucleation and propagation of\natomic-sized kink pairs susceptible of being studied using molecular dynamics\n(MD)…
In this project, our research focused on developing reaction chemistry that would support using carbon as a reductant for CO2 utilization that would permit CO2 consumption on a scale that would match or exceed anthropomorphic CO2 generation for energy production from fossil fuels. Armed with the knowledge that reactio…
itania-supported chromium oxides with different loadings have been embarked in catalytic oxidation of trichloroethylene (TCE) to inquire association of the formation of crystalline Cr2O3 with catalytic performances. A better activity in the oxidative TCE decomposition at chosen temperatures was represented when chromi…
We use point contact spectroscopy to probe the superconducting and normal state properties of the iron-based superconductor $\rm{NaFe_{1-\textit{x}}Co_{\textit{x}}As}$ with $\rm{\textit{x} = 0, 0.02, 0.06}$. Andreev spectra corresponding to multiple superconducting gaps are detected in the superconducting phase. For $…
In this paper, we analyze the conducted noise level of a long cable considering a subsea environment. Because conducted noise causes distortion for a signal and power line, it must be removed. As it have a negative effect on system reliability. Thus, we analyzed the effects of the conducted noise, which is caused by t…
We study the existence of regular polygons and regular solids whose vertices have integer coordinates in the three dimensional space and study side lengths of such squares, cubes and tetrahedra. We show that except for equilateral triangles, squares and regular hexagons there is no regular polygon whose vertices have…
The photo-stimulated discharge (PSD) technology was used to characterize the trap distribution of polyethylene (PE) and the PE that doped with 5% MgO before and after electrical aging. For the PE with the aging time increasing, the internal shallow trap of the material gradually reduced and deep trap gradually increas…
The spectra of the crystals of pyridine picrate crude formula, C11H8N4O7, in the mid infrared (IR) and Raman are studied as a function of temperature. They show some changes, which allowed us to first track and describe the structural changes (in both directions under the effect of heat treatment) accompanying the pha…
The ozone generation is commonly made with silent discharge method using quartz glass dielectric. In this paper, using Al₂O₃ dielectric to instead of the traditional quartz glass dielectric to improve the system efficiency is presented. The dielectric was manufactured as tube shape (Internal diameter × Outside diamete…