Search query: prediction of switchable half

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abstract: We propose that a half semiconducting state can exist in trigonal prismatic transition metal dichalcogenide (TMDC) monolayers of d${1} configuration. In that state both electrons and holes are spin polarized and share the same spin channel. On the basis of hybrid density functional theory, we predict in particular that VS$_2$ monolayers are half semiconductors with a direct band gap. Moreover, we find that the conduction electron spin orientation of VS$_2$ switches under moderate strain. Our predictions thus open up intriguing possibilities for applications of VS$_2$ in spintronics and optoelectronics. Our analysis of trigonal prismatic group V MX$_2$ (M=V, Nb, Ta; X=S, Se, Te) monolayers reveals a broad diversity of electronic states that can be understood qualitatively in terms of localization of $d$ electrons.
author_names: Peng-Ru Huang

Yao He

Hridis Kumar Pal

M Kindermann
title: Prediction of switchable half semiconductor in d${1} transition metal dichalcogenide monolayers
year: 2015

abstract: Vasiliy D. Buchelnikov, Vladimir V. Sokolovskiy, Olga N. Miroshkina, Danil R. Baigutlin, Mikhail A. Zagrebin, Bernardo Barbiellini, and Erkki Lahderanta Faculty of Physics, Chelyabinsk State University, 454001 Chelyabinsk, Russia National University of Science and Technology "MISiS" 119049 Moscow, Russia Department of Physics, School of Engineering Science, LUT University, FI 53850 Lappeenranta, Finland Faculty of Physics and Center for Nanointegration Duisburg Essen (CENIDE) University of Duisburg Essen, 47048 Duisburg, Germany National Research South Ural State University, 454080 Chelyabinsk, Russia and Physics Department, Northeastern University, Boston, Massachusetts 02115, USA (Dated: February 16, 2021)
author_names: Vasiliy D Buchelnikov

Vladimir V Sokolovskiy

Olga N Miroshkina

Danil R Baigutlin

Mikhail A Zagrebin

Bernardo Barbiellini

Erkki Lahderanta
title: Prediction of a Heusler alloy with switchable metal to half metal behavior
year: 2021

abstract: In this paper a polarization independent wavelength switchable flat top fiber comb filter is newly proposed, which is based on a Solc type birefringence combination and polarization diversity loop configuration. The proposed filter consists of a polarization beam splitter, two concatenated polarization maintaining fibers, and two half wave plates. Our theoretical analysis shows that the proposed apparatus has a much flatter passband and sharper notch than the conventional Sagnac birefringence filter. Particularly, by interchanging the Solc type birefringence combination within the filter between the folded and fan designs, channel wavelength switching operation, more specifically channel interleaving operation, can be achieved through the proper adjustment of the half wave plates contained within the apparatus. Theoretical prediction was verified by experimental demonstration.
author_names: Yong Wook Lee

Hyun-tak Kim

Jaehoon Jung

Byoungho Lee
title: Wavelength switchable flat top fiber comb filter based on a Solc type birefringence combination.
venue: Optics express
year: 2005

abstract: INTRODUCTION Hemophilia A is a genetic bleeding disorder resulting from a lack of clotting factor VIII. Where extended half life products are available, people with hemophilia may stop their current drug regimen and switch to a EHL product providing a more convenient dosing regimen. While most factor VIII concentrate regimens are started prophylactically based on international units per weight, this "one size fits all" approach does not account for the large pharmacokinetic variability between individuals. AIMS We explored methods to predict individual PK of an EHL product by using population pharmacokinetic models and eta values (e) a value that quantifies how individuals deviate from a population for any PK parameter, derived from a prior product. In addition, we wanted to investigate which individuals would benefit from this method compared to using a PopPK model alone. METHODS PK data from subjects (n 39) who have taken both Adynovate and Eloctate was collected from clinical trial data and from the Web Accessible Population Pharmacokinetic Service Hemophilia (WAPPS Hemo) database. In addition, PK data from subjects (n 200) who switched from a standard half life product to Eloctate was also extracted from the WAPPS Hemo database. Two methods to estimate individual PK outcomes of the second product were compared. The PopPK method used the Eloctate PopPK model published from WAPPS Hemo, while the e method incorporated individually scaled e from the prior product's PopPK model. Both methods were assessed for its performance in predicting PK outcomes. Absolute percent differences were calculated between the predicted and observed PK outcomes. Infusions were parsed into subgroups based on number of samples and individual e percentiles for analysis. RESULTS For the three switching protocols (Adynovate to Eloctate, Eloctate to Adynovate, and SHL FVIII to Eloctate) the e method resulted in a relative difference reduction in mean absolute percent difference of 27.8% (range 1 59% 4.9% (range 0 129% and 18.0% (0 79% in half life compared to the PopPK method respectively. With some exceptions (in particular central volume) the e method produced relative difference reduction in mean absolute percent differences up to 33% lower compared to the PopPK method. When individuals were parsed based on their e values (either CL or V1) the two methods differentiate up to 64% in terms of half life and time to 0.02 IU/mL predictions for individuals with a low (0th to 20th percentile) eCL or eV1 on the first product. Individuals with higher number of observations per infusion on the first product resulted in better predictions in PK parameter estimates when using the e method. CONCLUSION The use of prior knowledge by implementing e values into PopPK models may provide clinicians with a safer and more effective method to choose a dosing regimen for patients with hemophilia A switching from one factor concentrate to another. However, the e method was unable to better predict an increase or decrease in half life of a future product compared to the PopPK method, and thus supports the conclusion that most individuals would still benefit from a trial on the EHL and subsequent estimation of their individual PK profile from sparse measurements on the EHL.
author_names: Jacky K Yu

Alfonso Iorio

Andrea N Edginton
title: A comparison of methods for prediction of pharmacokinetics when switching to extended half life products in hemophilia A patients.
venue: Thrombosis research
year: 2020

abstract: Based on first principles calculations, we predict a stable two dimensional semiconductor, namely tin dioxide \mathrm{SnO}}_{2} By investigating its dynamical, thermal, and mechanical properties, we find that \mathrm{SnO}}_{2} monolayer is an auxetic material with a large in plane negative Poisson's ratio. Furthermore, our results show that \mathrm{SnO}}_{2} is an indirect gap semiconductor with a band gap in the region of 3.7 eV and an extremely high electron mobility, \ensuremath{\sim}{10}{3}\phantom{\rule{4pt}{0ex}\mathrm{cm}{2}\phantom{\rule{0.16em}{0ex}\mathrm{V}\ensuremath{ }1}\phantom{\rule{0.16em}{0ex}\mathrm{s}\ensuremath{ }1} Interestingly, the band structure of \mathrm{SnO}}_{2} presents double Mexican hat like band edges in the valence bands near the Fermi level. Due to such a unique band feature, a ferromagnetic phase transition takes place with a half metallic ground state that can be induced by hole doping within a very wide concentration range. Such a magnetic phase can be well explained by the Stoner mechanism. A peculiar feature of the magnetic state is the presence of large magnetocrystalline anisotropy that can switch from in plane to out of plane upon hole doping. Hence, \mathrm{SnO}}_{2} monolayer can be tuned to be either an $XY$ magnet or an Ising one, with a magnetic critical temperature above room temperature at proper hole concentrations. These findings demonstrate that the predicted phase of \mathrm{SnO}}_{2} is a rare example of $p$ type magnetism and a possible candidate for spintronic applications.
author_names: Peng Jiang

Lili Kang

Xiaohong Zheng

Zhi Zeng

Stefano Sanvito
title: Computational prediction of a two dimensional semiconductor SnO2 with negative Poisson's ratio and tunable magnetism by doping
year: 2020

abstract: In this paper, a temperature dependent SPICE model of SiC power MOSFET is used for statistical electrothermal (ET) simulations of parallel devices for multichip power module applications. The proposed approach is applied to a power module in a half bridge configuration, where parallel MOSFETs are subject to mismatched parameters. The impact of threshold voltage and current factor statistical fluctuations on energy dissipation during hard switching conditions is evaluated by means of Monte Carlo ET simulations. Thereafter, the mean time to failure (MTTF) has been estimated by using the lifetime models from literature for SiC chip. Finally, the effect of current imbalance on the acceleration factor due to changes in devices self heating is analyzed and discussed.
author_names: Alessandro Borghese

Michele Riccio

Alberto Castellazzi

Luca Maresca

Giovanni Breglio

Andrea Irace
title: Statistical Electrothermal Simulation for Lifetime Prediction of Parallel SiC MOSFETs and Modules
venue: 2020 2nd IEEE International Conference on Industrial Electronics for Sustainable Energy Systems (IESES)
year: 2020

abstract: This paper presents a semi theoretical method for predicting the turn off surge voltage (Vsurge) in double pulse test (DPT) using a power module (PM) with serially connected SiC MOSFET transistors structuring half bridge, in which module a DC link decoupling capacitor is also embedded. The circuit equations are simplified based on the fact that the MOSFETs act as their own parasitic capacitance, diode, or resistor having channel resistance (Rch) in their transient modes, but the drain source voltage (Vds) dependency of the capacitances and gate source voltage dependent Rch are taken into circuit behavior calculations. The partial element equivalent circuit (PEEC) method is used to estimate the stray inductances (Ls) of the PM. Other Ls's are empirically obtained by impedance measurement and preliminarily performed switching waveforms. Finally, multiple Kirchhoff's laws based equations are simultaneously solved. This calculation process is semi theoretical, and sufficiently predicts the Vsurge observed in DPT performed under various conditions.
author_names: Tatsuya Miyazaki

Yuta Okawauchi

Hirotaka Otake

Ken Nakahara
title: Semi Theoretical Prediction of Turn off Surge Voltage in a SiC MOSFET Power Module with an Embedded DC link Decoupling Capacitor
venue: 2020 IEEE Applied Power Electronics Conference and Exposition (APEC)
year: 2020

abstract: In this paper, the switching characteristics of a 1200 V/300 A SiC half bridge module in a T type converter is modeled and simulated. Firstly, all current loops of the two T type configurations for double pulse testing are investigated. The dc bus bar layout is proposed to minimize the stray inductance with four layers laminated structure. To reflect the actual switching characteristics, the parasitic inductance of the DC bus bar and major parasitic elements of the power module, such as junction capacitance, terminal to substrate capacitance, and terminal to terminal inductance are extracted with ANSYS Q3D. Finally, the experiment is carried out to verify the modeling of DC bus bar and power module, and to predict the switching characteristics to investigate the potential EMI.
author_names: Yong Liu

Kye Yak See

Rejeki Simanjorang

Ziyou Lim

Zhenyu Zhao
title: Modeling and simulation of switching characteristics of half bridge SiC power module in single leg T type converter for EMI prediction
venue: 2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC)
year: 2018

abstract: Predicting radiated emissions in large and complex power systems is difficult under a single set operational conditions, however when flexibility is introduced it becomes near impossible without using thousands of Monte Carlo type simulations. In this paper it is suggested to estimate the radiation efficiency (i.e. transfer function) of a power system based on a novel theoretical model and a limited amount of measurements under operating conditions. The switching power system is modeled as a LTI system that is excited by a known Sinusoidal Pulse Width Modulation (sPWM) source, i.e. the switching node voltage waveform. The theoretical model simplifies the estimation of the sPWM power spectrum, while its amplitude is also independent of modulation index. By measuring radiated electric fields and calculating Effective Radiated Power (ERP) one can estimate the system radiation efficiency in a novel way. The derived efficiency can eventually be used to optimize the radiated EMI, for instance by avoiding highly radiative frequencies in the signal generation.
author_names: Chris Van Diemen

Niek Moonen

Frank Leferink
title: Estimation of Radiation Efficiency of GaN Half Bridge Based Submodule System for Radiated EMI Prediction
venue: 2018 International Symposium on Electromagnetic Compatibility (EMC EUROPE)
year: 2018

abstract: Abstract In this paper, a novel linear switched reluctance motor (LSRM) is introduced in which the total electromagnetic losses and dimensions are significantly reduced compared to the conventional LSRMs. The LSRM's stator has a segmental structure, while its rotor possesses a seven pole configuration with three rotor poles equipped with the winding sets to generate the magnetic flux. The other remaining four rotor poles, i.e. auxiliary poles, are responsible for closing the magnetic flux path loop. In the proposed LSRM auxiliary mover poles (LSRM AMP) the flux path length is effectively reduced using the optimized provided auxiliary poles. Therefore, the required magnetomotive force (MMF) is reduced compared to the conventional LSRMs. In addition, as only half of the generated flux passes the stator segments, the dimensions of the stator segments and their corresponding weights are significantly reduced without any saturation issue. In order to verify the finite element (FE) based performance prediction of the proposed structure, the electromagnetic operating principles and the design rules of the LSRM AMP are separately investigated. A sensitivity analysis and comparative study for the proposed LSRM AMP and conventional LSRM topologies are presented to show the performance and characteristics superiority of the optimized LSRM AMP structure.
author_names: Amirreza Malekpour Shahraky

Saleh Sheikhkanloy

Hossein Torkaman

Mohammad Sedigh Toulabi
title: Design and Performance Prediction of a Novel Linear Switched Reluctance Motor
year: 2021