Materials Literature
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Nanomaterials are fundamental building blocks for nanoscience and nanotechnology. They can generally be categorized into three classes: zero-dimensional (0D) (e.g. nanoparticles), onedimensional (1D) (e.g. carbon nanotubes) and two-dimensional (2D) (e.g. thin films) nanomaterials. Assembly of nanomaterials is the key…
Technical developments in high-pressure and high-temperature generation have been made, adopting a recently devised multi-anvil 6-6 (MA 6-6) assembly with tungsten carbide (WC) anvils. As a result, the pressure and temperature conditions available in a cubic-anvil DIA type apparatus have been extended to 20 GPa and 20…
A perfect invisibility cloak is commonly believed to be undetectable from electromagnetic (EM) detection because it is equivalent to a curved but empty EM space created from coordinate transformation. Based on the intrinsic asymmetry of coordinate transformation applied to motions of photons and charges, we propose a…
ﺍﻟﻜﺜﺎﻓﺔ ﻟﻨﻤﺫﺠﺔ ﺍﻟﻤﻀﺒﺏ ﺍﻟﻤﻨﻁﻕ ﺘﻁﺒﻴﻕ ﺍﻻﻨﺘﺎﺠﻴﺔ ﺍﻟﻭﻻﺩﻱ ﺍﻻﻟﺒﺴﺔ
Recently, bulk nano-structured materials produced by severe plastic deformation (SPD) have attracted scientists attention. Materials produced by SPD are of great importance because of (1) non-porous structure, (2) great mechanical properties such as high strength and toughness and (3) proper dimension for mechanical a…
Abstract The effect of temperature on the structure of aluminoborosilicate liquids has been studied by 11 B MAS NMR, 11 B 3QMAS NMR, 23 Na and 27 Al MAS NMR spectroscopies using glass samples prepared with different cooling rates and thus different fictive temperatures. The abundance of BO 3 group and non-bridging oxy…
ZnO thin films on glass substrate were prepared by chemical vapor deposition (CVD) using zinc acetate as a starting material. Electrical properties of the films deposited at various substrate temperatures and sample position inside the chamber were investigated. Maximum conductivity is obtained for the film deposited…
We have investigated the effect of Yb substitution on the Pauli limited, heavy fermion superconductor, CeCoIn$_5$. Yb acts as a non-magnetic divalent substituent for Ce throughout the entire doping range, equivalent to hole doping on the rare earth site. We found that the upper critical field in (Ce,Yb)CoIn$_5$ is Pau…
The present study is carried out to investigate the development of the olfactory organ and it`s histological structure in the embryos, Larvae and adults of urodele amphibians Salamander Neurergus crocatus crocatus cope. The study includes the morphology of the developmental stages at so the level of light microscope.…
فی هذا البحث تم تصنیع قطع سیرامیکیة بورسلینیة من مواد عراقیة 100%وباستخدام رمال النجف لاول مرة بنسبة 30% ومن هذه المواد ایضا هی الکاؤولین الابیض بنسبة 45% ,الرمل الزجاجی بنسبة 25% وحطام الزجاج بنسبة 5%. تستخدم فی التفاعلات الکیمیاویة لمعامل انتاج الحوامض والغازات حیث تستخدم فی ملئ الرئکترات و تساعد فی زیادة سرعة التفا…
: Electrical conductivity and seeback effect studies of soft ferrite Ni0.2Zn0.8Fe2O4 as a function of annealing temperatures range (800 – 1200)oC. The electrical conductivity and seeback effect measurements are studied from different temperatures between 23oC to 323oC. So the seeback effect measurements show that the…
The devices in this study demonstrate a novel process methodology that allows for a self-aligned ALD AlO¿ gate insulator to be placed directly under the T-gate footprint and not in the access regions. After gate contact formation, standard PECVD SiN¿ passivation can be applied just as in a conventional HEMT process. P…
In this paper we report on the structural and optical characterization of NCI-AlGaN active regions grown on bulk AlN substrates. 800 nm-thick NCI AlGaN films having -57% AlN by mole fraction were deposited directly on bulk AlN substrates by plasma-assisted molecular beam epitaxy. The films were characterized optically…
The paper presents a novel method of forming electrically integrated ZnO nanobridges in which carbonized photoresist is used as a nucleation layer for selective growth. It has a promising application as nanowire contacts.
Recently a new photodetector design based on quantum dots and resonant-tunneling diode (QDRTD) was proposed by Shields et al. which demonstrated high detection efficiency and a resolution to the single photon level. Different from the avalanche photo diode (APD) based photodetector, the detection mechanism of this dev…
This article discusses the real-world practicality of nuclear power. Neither reactors nor casks of spent fuel have the capability of going “prompt critical” like a bomb. The laws of nature prohibit it and engineers must make clear that facts of nature are not matters of opinion. The Chernobyl reactor, which failed so…
Composite steel-CFRP (carbon fibre reinforced polymer) tubes combine the benefits of the stable, ductile plastic collapse mechanism of the steel and the high strength to weight ratio of the fibre/resin composite, to form a composite tube with high energy absorption capability. This paper presents experimental results…
The exciton and biexciton binding energies are calculated for a ZnSe/ZnS core/shell quantum dot incorporating WKB approximation. With the variations in shell thickness, the exciton binding energy shows nonlinear behavior. A maximum value of exciton binding energy is expected to occur for shell thickness equals to the…
We use ab initio density functional calculations to study the stability, elastic properties and electronic structure of sp2 carbon minimal surfaces with negative Gaussian curvature, called schwarzites. We focus on two systems with cubic unit cells containing 152 and 200 carbon atoms, which are metallic and very rigid.…
We studied the nonlocal transport of a quasi-one dimensional conductor $o$-TaS$_3$. Electric transport phenomena in charge density waves include the thermally-excited quasiparticles, and collective motion of charge density waves (CDW). In spite of its long-range correlation, the collective motion of a CDW does not ext…