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Machine learning-based discovery of vibrationally stable materials

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npj Computational Materials 2023年第1期9卷 2304-2309页

作者： Sherif Abdulkader Tawfik Mahad rashid Sunil Gupta Salvy P.russo Tiffany r.Walsh Svetha Venkatesh Institute for Frontier Materials Deakin UniversityGeelongVIC 3216Australia ArC Centre of Excellence in Exciton Science RMIT UniversityMelbourneVIC 3001Australia Applied Artificial Intelligence Institute(A2I2) Deakin UniversityGeelongVIC 3216Australia Chemical and Quantum Physics School of ScienceRMIT UniversityMelbourneVIC 3001Australia

The identification of the ground state phases of a chemical space in the convex hull analysis is a key determinant of the synthesizability of *** material databases have been instrumental in exploring one aspect of the synthesizability of many materials,namely thermodynamic ***,the vibrational stability,which is another aspect of synthesizability,of new materials is not *** first principles approaches to calculate the vibrational spectra of materials in online material databases is computationally ***,a dataset of vibrational stability for~3100 materials is used to train a machine learning classifier that can accurately distinguish between vibrationally stable and unstable *** classifier has the potential to be further developed as an essential filtering tool for online material databases that can inform the material science community of the vibrational stability or instability of the materials queried in convex hulls.

关键词： materials stability vibrational

Positron-Acoustic Shock Waves in a Degenerate Multi-Component Plasma

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Chinese Physics Letters 2015年第8期32卷 111-115页

作者： Shah M. G. Hossen M. r. Sultana S. Mamun A. A. Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh Department of Natural Sciences Daffodil International University Dhanmondi Dhaka-1207 Bangladesh

A theoretical investigation on the propagation of positron-acoustic shock waves （PASWs） in an unmagnetized, collisionless, dense plasma （containing non-relativistic inertial cold positrons, non-relativistic or ultra-relativistic degenerate electron and hot positron fluids and nondegenerate positively charged immobile ions） is carried out by employing the reductive perturbation method. The Burgers equation and its stationary shock wave solution are derived and numerically analyzed. It is observed that the relativistic effect （i.e., the presence of non/ultra- relativistic electrons and positrons） and the plasma particle number densities play vital roles in the propagation of PASWs. The implications of our results in space and interstellar compact objects including non-rotating white dwarfs, neutron stars, etc. are briefly discussed.

关键词： Positron-Acoustic Shock Waves in a Degenerate Multi-Component Plasma

Absolute Stability of General Lurie Control Systems with Multi-Nonlinear Feedback Terms

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Acta Mathematica Sinica,English Series 2001年第4期17卷 649-656页

作者： Zuo Xin GAN Wei Gao GE Institute of Systems Science, Chinese Academy of Sciences, Beijing 100080, P. r. China Department of Applied Mathematics, Beijing Institute of Technology, Beijing 100081, P. r. China Institute of Systems Science Chinese Academy of Sciences Beijing 100080 P. R. China Department of Applied Mathematics Beijing Institute of Technology Beijing 100081 P. R. China

In this paper, the problenl of absohlte stability for general Lurie control systems with multi- nonlinear feedback terms is investigated. From the Lyapunov function approach. new necessary and sufficient conditious and some practical sufficient conditions of absolute stability are derived. which improve the absolute stability for the set. A numerical examplc illustrates the effectiveness of the proposed results.

关键词： General Lurie system Multi-nonlinear feedback Absolute stability

Local Dissipativity and Attractors for the Evolutionary Superconductivity Problem

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Acta Mathematica Sinica,English Series 2001年第3期17卷 381-390页

作者： Hong Jun GAO Department of Mathematics,Nanjing Normal University,Nanjing 210024,P.r.China E-mail:gaohj@hotmail.comJi Shan FAN Department of Alathernatics,Suzhou University,Suzhou 215006.P.r.China Department of Mathematics Nanjing Normal University Nanjing 210024 P. R. China

In this paper,under the Lorenz gauge,the global existence,local dissipativity and at- tractors of the evolutionary superconductivity problem which is a parabolic-hyperbolic system are obtained.

关键词： Superconductivity Attractor Ginzburg-Landau system

Effects of Contents of Multiwall Carbon Nanotubes in Polyaniline Films on Optical and Electrical Properties of Polyaniline

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Chinese Physics Letters 2016年第11期33卷 116-119页

作者： N.Bafandeh M.M.Larijani A.Shafiekhani M.r.Hantehzadeh N.Sheikh Department of Physics Science and Research BranchIslamic Azad University Nuclear radiation Applications research School Nuclear Science and Technology Research Institute Physics Department Alzahra University School of Physics Institute for Research in Fundamental Sciences

We investigate the effects of different contents of multiwall carbon nanotubes （MWCNTs） on optical and electrical properties of polyaniline （PANI）. The MWCNTs/PANI composites are deposited on glass substrates coated with indium tin oxide （ITO） by the spin-coating technique. The scanning electron microscopy shows that nanotubes are coated with the PANI layer and x-ray diffraction patterns show that all deposited composite films have an amorphous character. The analysis of a UV-vis spectrophotometer indicates the blue shift of the absorbance peak and a decrease in optical band gap value by the enhancement of the CNT content in the PANI matrix while the Urbach energy increases. The raman spectrum shows the blue shift 1404→1417cm^-1 and photoluminescence spectra show an increase in the intensity of characteristic PANI peak at 436 nm with the increasing CNT content.

关键词： PANI of CNT in CNTs on

Soil Salinity Changes in the Jordan Valley Potentially Threaten Sustainable Irrigated Agriculture

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Pedosphere 2013年第3期23卷 376-384页

作者： T.G.AMMArI r.TAHHAN S.ABUBAKE Y.AL-ZU'BI A.TAHBOUB r.TA'ANY S.ABU-rOMMAN N.AL-MANASEEr M.H.STIETIYA Department of Water resources and Environmental Management Faculty of Agricultural Technology Al-Balqa' Applied University Department of Natural resources and Environment Faculty of Agriculture Jordan University of Science and Technology Department of Plant Production and Protection Faculty of Agricultural Technology Al-Balqa' Applied University Department of Biotechnology Faculty of Agricultural Technology Al-Balqa' Applied University Department of Land Water and Environment Faculty of Agriculture University of Jordan

The integrated effect of irrigation and agricultural practices on soil salinity in the Jordan Valley （JV）, where over 60% of Jordan＇s agricultural produce is grown, was investigated in this study during 2009-2010. Due to the differences in agricultural operations, cropping patterns, irrigation management, and weather conditions, 206 top- and sub-soil samples were taken every 1 to 3 km from representative farms along a north-south （N-S） transect with 1 to 2 km lateral extents. Soil electrical conductivity of saturated extract （ECse）, Ca, Mg, K, Na, CI, and Na adsorption ratio （SAr） were determined in saturated paste extracts. results indicated that about 63% of soils in the JV are indeed saline, out of which almost 46% are moderately to strongly saline. Along the N-S transect of the JV, ECse increased from 4.5 to 14.1 dS m-1 in top-soil samples. Similar increase was observed for the sub-soil samples. The major chemical components of soil salinity; i.e., Ca, Mg, and C1, also showed a similar increase along the N-S transect of the valley. Moreover, compared to previous field sampling, results showed that changes in soil salinity in the JV were dramatic. In addition, it was found that C1 imposed an existing and potential threat to sensitive crops in 60% of the soils in the JV, where C1 concentrations were greater than 710 mg L-1. Under the prevalent arid Mediterranean conditions, improving the management of .irrigation water, crops, and nutrient inputs and increasing water and fertilizer use efficiencies should be indispensable to conserve and sustain the already fragile agricultural soils in the JV.

关键词： agricultural practices chloride electrical conductivity irrigation water quality soil salinization

AGrONOMIC AND ENVIrONMENTAL BENEFITS OF rEINTrODUCING HErB-AND LEGUME-rICH MULTISPECIES LEYS INTO ArABLE rOTATIONS:A rEVIEW

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Frontiers of Agricultural Science and Engineering 2022年第2期9卷 245-271页

作者： Emily C.COOLEDGE David r.CHADWICK Lydia M.J.SMITH Jonathan r.LEAKE Davey L.JONES School of Natural Sciences Bangor UniversityGwyneddLL572UWUK National Institute of Agricultural Botany Huntingdon RoadCambridgeCB 3 OLEUK Plants Photosynthesis and SoilUniversity of SheffieldSheffieldS102TNUK Centre for Sustainable Farming Systems Food Futures InstituteMurdochWA 6150Australia

Agricultural intensification and the subsequent decline of mixed farming systems has led to an increase in continuous cropping with only a few fallow or break years,undermining global soil ***-ley rotations incorporating temporary pastures(leys) lasting 1–4 years may alleviate soil degradation by building soil fertility and improving soil ***,the majority of previous research on arable-ley rotations has utilized either grass or grassclover leys within ungrazed *** leys,containing a mix of grasses,legumes,and herbs,are rapidly gaining popularity due to their promotion in agri-environment schemes and potential to deliver greater ecosystem services than conventional grass or grass-clover *** grazing in arable-ley rotations may increase the economic resilience of these systems,despite limited research of the effects of multispecies leys on ruminant health and greenhouse gas *** review aims to evaluate previous research on multispecies leys,highlighting areas for future research and the potential benefits and disbenefits on soil quality and livestock *** botanical composition of multispecies leys is crucial,as legumes,deep rooted perennial plants(e.g.,Onobrychis viciifolia and Cichorium intybus) and herbs(e.g.,Plantago lanceolata) can increase soil carbon,improve soil structure,reduce nitrogen fertilizer requirements,and promote the recovery of soil fauna(e.g.,earthworms) in degraded arable soils while delivering additional environmental benefits(e.g.,biological nitrification inhibition and enteric methane reduction).Multispecies leys have the potential to deliver biologically driven regenerative agriculture,but more long-term research is needed to underpin evidence-based policy and farmer guidance.

关键词： bioactive forages integrated crop-livestock systems nitrogen cycling plant secondary metabolites soil carbon soil quality

Where is the global in global mental health?A call for inclusive multicultural collaboration

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General Psychiatry 2020年第6期33卷 423-425页

作者： Tom L Osborn Akash r Wasil John r Weisz Arthur Kleinman David M Ndetei Department of Psychology Harvard UniversityCambridgeMassachusettsUSA Shamiri Institute NairobiKenya Department of Psychology University of PennsylvaniaPhiladelphiaPennsylvaniaUSA Department of Anthropology Harvard UniversityCambridgeMassachusettsUSA Department of Global Health and Social Medicine Harvard Medical SchoolBostonMassachusettsUSA Africa Mental Health research and Training Foundation NairobiKenya Department of Psychiatry University of NairobiNairobiKenya

To the editor:Common mental health disorders,like depression and anxiety,account for 45%of the global disease burden on youths aged 15-29.1 This challenge is particularly significant in low and middle-income countries(LMICs)where risk factors such as poverty,limited treatment options and stigma restrict access to care and exacerbate the burden and magnify the impact of mental disorders.23 Given these barriers,there is an urgent need for research dedicated to expanding mental healthcare for young people in LMICs.

关键词： editor global income

relay Feedback Based Autotuning PID Control of Paper Basis Weight in Paper Making Process

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Journal of Systems Engineering and Electronics 2003年第1期14卷 63-69页

作者： Tang Wei, Shi Songjiao & Wang MengxiaoDept. of Automation, Shanghai Jiaotong University, Shanghai 200030, P. r. China Dept. of Automation, Northwest Institute of Light Industry, Xianyang 712081, P. r. China Dept. Automation Jiaotong University Shanghai 200030 P. R. China Dept. of Automation Northwest Institute of Light Industry. Xianyang 712081. P. R. China Dept. of Automation Northwest Institute of Light Industry. Xianyang 712081. P. R. China

The brief arts and crafts of the ordinary fourdrinier are introduced first. After the intractable points of paper basis weight (BW) control are analyzed, an autotuning PID/PI control algorithm based on relay feedback identification is proposed, which has such advantages as simple parameter adjustment, little dependence on process model, strong robustness and easiness to implementation. And it is very suitable for controlling such processes as BW loop with large time delay.

关键词： Paper basis weight Time delay process Autotuning PID relay feedback identification.