The Amorphous-Crystal Interface in Silicon: a Tight-Binding Simulation

The structural features of the interface between the cystalline and amorphous phases of Si solid are studied in simulations based on a combination of empirical interatomic potentials and a nonorthogonal tight-binding model. The tight-binding Hamiltonian was created and tested for the types of structures and distortions anticipated to occur at this interface. The simulations indicate the presence of a number of interesting features near the interface. The features that may lead to crystallization upon heating include chains with some defects, most prominently dimers similar to those on the Si(001) 2x1 reconstructed free surface. Within the amorphous region order is lost over very short distances. By examining six different samples with two interfaces each, we find the energy of the amorphous-crystal interface to be 0.49 +/- 0.05 J/m^2Comment: Submitted to Phys. Rev.

Analisis Faktor Aksesbilitas dan Fasilitas Umum terhadap Zona Nilai Tanah Berdasarkan Harga Pasar Wajar Tahun 2017 dengan Metode Pendekatan Penilaian Massal dan Sistem Informasi Geografis (Studi Kasus : Kecamatan Rembang, Kabupaten Rembang)

Tanah merupakan salah satu sumber daya yang sangat penting bagi kelangsungan hidup manusia untuk melakukan berbagai kegiatan. Kebutuhan tanah yang meningkat menyebabkan harga tanah yang beragam dan melonjaknya harga tanah, sebab tanah yang diperjual belikan dapat dijadikan jaminan. Keberagaman harga tanah dapat disebabkan oleh bermacam-macam faktor. Salah satu faktor yang dapat yang mempengaruhi harga tanah adalah faktor aksesibilitas.Data yang digunakan berupa data tekstual yang berupa, data Nilai Jual Objek Pajak (NJOP) yang didapatkan dari DPPKAD Kabupaten Rembang serta data survey harga tanah yang dilakukan di lapangan. Data harga pasar yang telah didapat kemudian diolah untuk mendapatkan NIR. Kemudian dicari selisih antara data NJOP serta NIR. Untuk analisis pengaruh faktor aksesibilitas dilakukan pengujian statistik antara harga pasar tanah dan variabel-variabel bebas yang ditentukan.Dari penelitian diperoleh 64 Zona Nilai Tanah dengan NIR tertinggi berada pada zona 60 sebesar Rp 3.490.700 per m2 dan NIR terendah terdapat pada zona 48 sebesar Rp 48.400 per m2. Serta diperoleh data NJOP (Nilai Jual Objek Pajak) tanah dengan nilai terendah sebesar Rp 5.000 per m2 dan nilai tertinggi sebesar Rp 335.000 per m2. Sementara selisih antara NIR dengan NJOP paling besar adalah sebesar 8272,03% dan selisih antara NIR dengan NJOP paling rendah sebesar 595,71%. Dari hasil pengujian statistik, faktor aksesibilitas dan fasilitas umum terhadap harga pasar memiliki pengaruh 44,9 %, yaitu antara variabel bebas terhadap variabel terikat

Knowledge of Arsenic in Drinking-water: Risks and Avoidance in Matlab, Bangladesh

Widespread contamination of arsenic in Bangladesh has been jeopardizing the health of millions of people. Residents of Matlab, Bangladesh, are among the millions at risk. Using bivariate models in the analysis of survey data, knowledge of health risks and avoidance of arsenic exposure in response to widespread contamination of arsenic for residents of Matlab were estimated. The models examined individuals' knowledge of an arsenic problem in the household and knowledge of specific illnesses caused by arsenic exposure. The likelihood of avoiding exposure to arsenic contamination was further examined. Results of the estimation showed that individual's knowledge of arsenic problems in the household was gathered through awareness campaigns and by word of mouth and that knowledge of illnesses was predicated on education, health, presence of children, elderly and young women. Adoption of avoidance measures was not affected by exposure to arsenic-information sources, but level of education had a statistically significant positive effect on the decision to avoid arsenic exposure. Lack of convenience of safe drinking-water practices lead people to persist in drinking arsenic-contaminated water

High performance speed control of single-phase induction motors using switching forward and backward EKF strategy

The aim of this research is to provide a high performance vector control of single-phase Induction Motor (IM) drives. It is shown that in the rotating reference frame, the single-phase IM equations can be separated into forward and backward equations with the balanced structure. Based on this, a method for vector control of the single-phase IM, using two modified Rotor Field- Oriented Control (RFOC) algorithms is presented. In order to accommodate forward and backward rotor fluxes in the presented controller, an Extended Kalman Filter (EKF) with two different forward and backward currents that are switched interchangeably (switching forward and backward EKF), is proposed. Simulation results illustrate the effectiveness of the proposed algorithm

A Novel Method for Rotor Field-Oriented Control of Single-Phase Induction Motor

This paper presents a novel rotor field-oriented control (RFOC) method for asymmetrical single-phase induction motor (SPIM). It is shown in this paper that by using a suitable transformation matrix (TM) for stator current variables, the asymmetrical equations of SPIM are transformed into symmetrical equations. Based on this similarity, a novel vector conrol technique for SPIM is presented. Performance of the proposed method is assessed using MATLAB/SIMULINK software. Simulation results showed the excellence speed and torque responses obtained using the proposed technique

Kinematic Self-Similar Plane Symmetric Solutions

This paper is devoted to classify the most general plane symmetric spacetimes according to kinematic self-similar perfect fluid and dust solutions. We provide a classification of the kinematic self-similarity of the first, second, zeroth and infinite kinds with different equations of state, where the self-similar vector is not only tilted but also orthogonal and parallel to the fluid flow. This scheme of classification yields twenty four plane symmetric kinematic self-similar solutions. Some of these solutions turn out to be vacuum. These solutions can be matched with the already classified plane symmetric solutions under particular coordinate transformations. As a result, these reduce to sixteen independent plane symmetric kinematic self-similar solutions.Comment: 29 pages, accepted for publication in Classical Quantum Gravit

Effects of three-body interactions on the structure and thermodynamics of liquid krypton

Large-scale molecular dynamics simulations are performed to predict the structural and thermodynamic properties of liquid krypton using a potential energy function based on the two-body potential of Aziz and Slaman plus the triple-dipole Axilrod-Teller (AT) potential. By varying the strength of the AT potential we study the influence of three-body contribution beyond the triple-dipole dispersion. It is seen that the AT potential gives an overall good description of liquid Kr, though other contributions such as higher order three-body dispersion and exchange terms cannot be ignored.Comment: 11 pages, 3 figures, LaTeX, to appear in J. Chem. Phy

Performance Of Plate Distributor And Spray Nozzle For An Unpacked Saturator.

Saturator efficiency is vital in operational cost of dissolved air flotation plants as it would have an impact on the amount of recycle ratio required for satisfactory removal of suspended solids from the influent stream

Quasi one dimensional 4^4He inside carbon nanotubes

We report results of diffusion Monte Carlo calculations for both $^4$He absorbed in a narrow single walled carbon nanotube (R = 3.42 \AA) and strictly one dimensional $^4$He. Inside the tube, the binding energy of liquid $^4$He is approximately three times larger than on planar graphite. At low linear densities, $^4$He in a nanotube is an experimental realization of a one-dimensional quantum fluid. However, when the density increases the structural and energetic properties of both systems differ. At high density, a quasi-continuous liquid-solid phase transition is observed in both cases.Comment: 11 pages, 3ps figures, to appear in Phys. Rev. B (RC