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Summary form only given. Processing of materials in high power microwave field is unique in many ways. The process is fast, energy efficient and environment friendly. Wide variety of materials, such as, insulating ceramics, semiconductors, metals and metallic compounds have been microwave processed. In many situations, it offers choice to choose an appropriate processing route. Materials, for example,...
Polyaniline (PANI) thin film on alumina was prepared by the chemical oxidation of aniline with ammonium peroxydisulphate in acidic aqueous medium. DC conductivity, microwave transmission and reflection, shielding effectiveness of the conducting PANI films is reported. The microwave system used for the measurement of transmittance and reflectance was the X-band (8.2 to 12 GHz) waveguide reflectometer.
This paper describes the design and development of band pass filter (BPF) at 140 GHz. Two different design techniques are used to realize the filter. First design uses capacitively coupled series resonators in suspended stripline configuration and second one uses metal insert filter (MIF) technique in waveguide configuration. Both the designs are modeled and optimized using CST (Computer Simulation...
The quality of ohmic contacts in pseudomorphic high electron mobility transistors (p-HEMTs) formed by sequential e-beam evaporation of Ni/Ge/Au/Ag/Au was investigated as a function of alloying cycles in the range from 390degC to 460degC for duration of 30 sec. The contact resistance (Rc) and the specific transfer resistance (ohm-mm) values of ohmic contacts so formed were measured by Transmission...
A new model of microwave susceptors for FDTD simulations of electromagnetic heating phenomena is developed. Susceptors are thin metal coatings inside microwaveable food packages used to enhance the heating effects. Their modelling is crucial for accurate design of microwave ovens and food packages. It is shown that susceptors of typical parameters cannot be directly meshed (due to small thicknesses)...
Microwave synthesis represents one of the important dimensions of modern chemistry attracting a considerable amount of attention. A biologically potent Schiff base derived from 3-acetyl-2,5-dimethylthiophene and 2-aminothiophenol and its Pd(II) and Pt(II) metal complexes of the type [M(Bzt)2] (where M = Pd/Pt and Bzt = deprotonated ligand) have been synthesized by thermal as well as Microwave assisted...
The advantages of microwave assisted synthesis over thermal method are enhanced reaction rates, less or no formation of side products short reaction time, higher yields of pure products and reaction can be carried on a preparative scale in open vessels. Thus we introduce here with an efficient, rapid reaction, with atom economy follows an ecofriendly protocol, a concept of ldquoGreen Chemistryrdquo...
Dielectric windows often limit the power handling capability of vacuum electron devices. It is necessary to choose the right dielectric material for high power applications. Depending upon the power level, a range of materials has been used in various systems. The ideal material should have high mechanical strength, high thermal conductivity, high electrical breakdown voltage, low dielectric loss,...
In this paper, we propose a novel MOSFET design: Gate Material Engineered-Trapezoidal Recessed Channel (GME-TRC) MOSFET and investigate the effect of the negative junction depth (NJD) for different source drain(S/D) extension on the electrical behaviour of proposed structure. The results are compared with conventional Trapezoidal Recessed Channel (TRC) MOSFET using device simulators-DEVEDIT 3-D and...
A very simple electrochemical process is used to deposit platinum (Pt) and nickel (Ni) on silicon (Si) substrate to form Schottky junction. The electrical behaviors of these Schottky junctions are observed. We also used TCAD (SILVACO 3.2) to fabricate these Schottky junctions and to observe the electrical behavior of these devices, and it shows that experimental and simulated results are close.
The azomethines1-[(2-hydroxyphenyl)-1-N-phenylamino] hydrazine-carboxamide (HOcapNcapOH) and 2-hydroxy-N-phenyl benzamide benzothiazoline (HOcapNcapSH) have been synthesized by the condensation of 2-hydroxy-N-phenylbenzamide with semicarbazide hydrochloride and 2-aminothiophenol, respectively. The new derivatives have been prepared by the reactions with hydrated lanthanide chlorides. Elemental analysis...
This paper present modeling aspects for 4H-SiC Schottky diode using drift diffusion model. Drift diffusion model consists of the current continuity equations for electrons and holes, Poissonpsilas equation and the equations for electron and hole currents. Using this model physical surface trait, state of art of device has been extracted to understand the current condition of 4H-SiC Schottky barrier...
The synthetic, spectroscopic and biological studies of some new chromium (III) complexes derived from biologically active nitrogen, sulphur/oxygen donor ligands 2-acetylthiophene thiosemicarbazone (L1H) and 2-acetylthiophene semicarbazone (L2H) have been described. Both the ligands were prepared by the condensation of 2-acetylthiophene with thiosemicarbazide and semicarbazide hydrochloride (in presence...
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