Materials Literature
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A low pressure chemical vapour deposition method is employed to fabricate iron catalysed carbon nanotubes. The iron catalyst is deposited on silicon substrate using a thermal evaporation method. The reactive gas mixture is C2H2/H2 with a flow rate of 50/50 sccm. The chamber pressure and temperature are maintained at 5…
Veliki dio metalnih konstrukcija izložen je raznim vrstama korozije, dobru zaštitu od korozije, dobru zaštitu od asfrsi korozije u vodi pruža zaštita pocinčavanjem. Međutim uočeno je da pri višim temperaturama vode dolazi do ubrzane korozije cjevovoda za pitku vodu, pa je cilj ovog raa bio odrediti kritičnu temperatur…
The biomass, mineral elements and protein contents of six freshwater macrophytes found in Ghana are reported in this paper. The plants are Ceratophyllum demersum (a submerged plant), Eichhornia crassipes and Pistia stratiotes (free-floating plants), Echinochloa pyramidalis and Typha domingensis (emergent plants) and N…
The inhibiting effect of N’– benzyl – N’ – phenyl thiourea (BPTU) on the corrosion behavior of 304 SS in 3 N HCl solutions has been studied using potentio-dynamic polarization technique. The results obtained shows that BPTU is an efficient anodic inhibitor with greater than 93% of efficiency in the temperature range s…
运用密度泛函理论结合对称性破缺方法(DFT-BS)研究了双锰取代的三明治型多酸阴离子[MnII2(Xn+Mo9O33)2]2(n-10)- (X = PV, AsV, SeVI)的磁交换作用. 计算得到的磁交换耦合常数(J)为负值, 表明在这类体系中存在反铁磁交换作用; 进一步从几何, 自旋密度分布和前线轨道组成方面分析了中心杂原子X对磁交换耦合的影响, 结果表明随着随着中心杂原子X的改变(PV–AsV–SeV), 影响到中心双核锰和桥氧构成的磁簇的结构, Mn1…Mn2距离有所增大, Ob…Ob距离有所缩短, 从而减弱了超交换途径的有效性, 反铁磁耦合常数J的数值依次减小.
Досліджено вплив параметрів модифікувального кисневмісного середовища (ступеня розрідження, температури та тривалості модифікування) на оксинітрування титанових сплавів. Показано, що зі збільшенням розрідження середовища та зниженням температури модифікування фазоутворення на поверхні титанових сплавів еволюціонує у б…
Several works have appeared in the literature as a result of the joint activity of Imperial College London with the European Solar Test Installation and other European research centres on luminescent solar concentrators: some have been specifically related to indoor and outdoor characterisation. Within the characteris…
Under Carnage Doors are doubly curved co-cured construction consists of skin, bladed stiffener and back to back channels. In addition, this is the only composite part that experiences the maximum load during take-off and landing. This has opened a greater challenge for realising the airworthy components. Because of it…
Eine Vielzahl flaechiger Stahlbetonbauteile, wie etwa in Parkhaeusern oder Bruecken sind im Winter Tausalzen ausgesetzt. Dadurch entsteht ein hohes Risiko fuer chloridinduzierte Korrosion der Stahlbewehrung. Um diese Bauteile korrekt unterhalten zu koennen, ist es notwendig, die gesamte Oberflaeche hinsichtlich folgen…
As the performance of multimedia systems continuously improves, it has become apparent that metal interconnects will be increasingly difficult to provide sufficient bandwidth at the board or backplane levels. Optical interconnect, with its almost unlimited bandwidth, has the potential to solve the I/O bottleneck probl…
Described as THE classic text on magnetism, FERROMAGNETISM covers the basics of magnetics, as well as in-depth coverage of magnetic materials. IEEE Press has now brought this important cornerstone of magnetics research back into print. Recognized for its breadth of coverage, this book includes information on magnetic…
Hydrogenated silicon carbide and silicon carbide nitride are widely studied for their good antireflective and passivating properties on both p-type and n-type crystalline silicon-based solar cells. Such materials are mainly prepared by PECVD processes using silane-hydrocarbon mixtures such as SiH4/CH4. We report the u…
本研究以真空電弧熔煉法，製備由Al, Co, Cr, Fe, Ni與Ti組成的，多種五元及六元等莫合與非等莫耳高熵合金。所得到的鑄造態合金經過1100℃持溫24小時，均質化水淬，得到均質化態合金。鑄造態合金及均質化態合金，作微結構、熱膨脹係數及磁場大至9 T的霍爾效應量測。微結構主要由FCC, BCC, Full Heusler與Sigma相組成，大部分具有磁性。均質化態合金的磁性Invar效應，使合金熱膨脹係數在居禮溫度處下降，此乃磁矩排列由有序變成無序的結果。等莫耳均質化態合金居禮溫度在480 K到750 K之間，非等莫耳均質化態合金居禮溫度在780 K到870 K之間。 本研究許多合金出現異常霍爾效應，與各約一半合金出現類電…
Low temperature surface passivation on silicon using SiO2 prepared by Perhydropolysilazane (PHPS) as source material has investigated. The PHPS, which is an organosilicate polymer consisting of cyclic (-SiH2-NH-)n units, turns to SiO2 by heat treatment lower than 450°C. Hot steam annealing, O2 annealing, and hydrogen…
Numerical simulation is performed for microdroplet deposition on a pre-patterned micro-structure. The liquid-air interface is tracked by a level-set method, which is improved by incorporating a sharp-interface modeling technique for accurately enforcing the matching conditions at the liquid-gas interface and the no-sl…
The charge-carrier mobility of the blend films consisting of organic small molecule and quantum dots (QDs)，Alq3 and CdSeS，are studied by time-of-flight (TOF) technique. The dependence of charge-carrier mobility in the blend films on electric filed and QD concentration is measured. The results show that the positional…
This chapter contains sections titled: Magnetically Levitated Micro-Machines Fabrication and Testing of a Micro Superconducting Actuator Using the Meissner Effect Room Temperature, Open-Loop Levitation of Microdevices Using Diamagnetic Materials
This chapter contains sections titled: Introduction Dissipation Factor of a Cable Bridge Techniques for the Measurement of tan Partial-Discharge Characteristics Partial-Discharge Measurements Partial-Discharge Site Location Discharge Pulse Pattern Studies Electrical Aging Mechanisms Accelerated Electrical Aging Tests…
It is well known that SMA's exhibit complex non linear thermo -mechanical behavior. Further they exhibit hysteresis both in the thermal and stress loading domains. It is in this context that the thermo-mechanical investigations in relation to the consistent and repeatable actuator properties assume importance. The inv…
Interstitial oxygen is the most prevalent impurity in crystalline silicon. An upper limit of around 12 ppma [Oi] has long been accepted for multicrystalline solar cells. This paper demonstrates that it is possible to manufacture solar cells with an efficiency of over 15.4% at 20 ppma interstitial oxygen from commercia…