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Effects of forced aeration on community dynamics of free and attached bacteria in copper sulphide ore bioleaching

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international Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 59-69页

作者： Wei Chen shenghua Yin i.M.s.K.ilankoon Key Laboratory of Ministry of Education for High-Efficient Mining and safety of Metal University of Science and Technology BeijingBeijing 100083China school of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Discipline of Chemical Engineering School of EngineeringMonash UniversityJalan Lagoon SelatanBandar SunwaySelangor Darul Ehsan 47500Malaysia

Bacterial community dynamics and copper leaching with applied forced aeration were investigated during low-grade copper sulphide bioleaching to obtain better bioleaching *** illustrated that appropriate aeration improved bacterial concentrations and leaching *** highest bacterial concentration and Cu^(2+)concentration after 14-d leaching were 7.61×10^(7) cells·mL^(−1) and 704.9 mg·L^(−1),respectively,at aeration duration of 4 h·d^(−1).The attached bacteria played a significant role during bioleaching from 1 to 7 ***,free bacteria dominated the bioleaching processes from 8 to 14 *** phenomenon was mainly caused by the formation of passivation layer through Fe3+hydrolysis along with bioleaching,which inhibited the contact between the attached bacteria and ***,16s rDNA analysis verified the effect of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans on the bioleaching *** results demonstrate the importance of free and attached bacteria in bioleaching.

关键词： attached bacteria bioleaching forced aeration free bacteria low-grade copper sulphide ore

internal structure Visualization of Flow and Flame by Process Tomography and PLiF Data Fusion

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Journal of Thermal science 2018年第1期27卷 64-73页

作者： LiU J. LiU shi sUN s. PAN X i.H.i schlaberg North China Electric Power University 2 Beinong RoadChangping DistrictBeijing 102206China

To address the increasing demands on pollution control and energy saving, the study of low-emission and high-efficiency burners has been emphasized worldwide. swirl-induced environmental burners(EV-burners), have notable features aligned with these requirements. in this study, an EV burner is investigated by both an ECT system and an OH-PLiF system. The aim is to detect the structure of a flame and obtain more information about the combustion process in an EV burner. 3D ECT sensitivity maps are generated for the measurement and OH-PLiF images are acquired in the same combustion zone as for the ECT measurements. The experimental images of a flame by ECT are in good agreement with the OH radical distribution pictures captured by OH-PLiF, which provide a mutual verification of the visualization method.

关键词： Tomographic measurement EV burner ECT OH-PLiF

Photovoltaic and photoelectric response of sn_(2)P_(2)s_(6) ferroelectric films

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Journal of Advanced Dielectrics 2019年第1期9卷 22-26页

作者： A.V.solnyshkin i.L.Kislovay A.N.Belov V.i.shevyakov D.A.Kiselev i.P.Raevski D.N.sandjiev s.i.Raevskaya ational Research University of Electronic Technology Zelenograd Moscow 124498Russia Department of Condensed Matter Physics Tver state University Tver 170100Russia National University of science and Technology“Misis” Moscow 119049Russia Research institute of Physics southern Federal University Rostov-on-DonRussia

in the present work,the comparative study of the electric response of sn_(2)P_(2)s_(6) films to the visible light action was carried out without and under external electric *** light flux modulated by a chopper induces the integral response comprising time-dependent photoelectric and photovoltaic *** was shown that spontaneous polarization influences the electric response characteristics.

关键词： Photovoltaic response photoelectric properties ferroelectric film

Recent advances in catalytic systems for CO_(2) conversion to substitute natural gas(sNG):Perspective and challenges

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Journal of Energy Chemistry 2021年第11期30卷 377-407,I0008页

作者： i.Hussain A.A.Jalil N.s.Hassan M.Y.s.Hamid Department of Chemistry Faculty of ScienceUniversiti Teknologi Malaysia81310 UTM Johor BahruJohorMalaysia school of Chemical and Energy Engineering Faculty of EngineeringUniversiti Teknologi Malaysia81310 UTM Johor BahruJohorMalaysia Centre of Hydrogen Energy Institute of Future Energy81310 UTM Johor BahruJohorMalaysia

it has been well established that carbon dioxide(CO_(2))is one of the main greenhouse gasses and a leading driver of climate *** chemical conversion of CO_(2) to substitute natural gas(sNG)in the presence of renewable hydrogen is one of the most promising solutions by a well-known process called CO_(2) *** have been comprehensive efforts in developing effective and efficient CO_(2) methanation catalytic ***,the choice of competitive and stable catalysts is still a monumental obstruction and a great challenge towards the commercialization and industrialization of CO_(2) *** is necessary to emphasize the critical understandings of intrinsic and extrinsic interactions of catalyst components(active metal,support,promoter,etc.)for enhanced catalytic performance and stability during CO_(2) *** study reviews the up-to-date developments on CO_(2) methanation catalysts and the optimal synergistic relationship between active metals,support,and promoters during the catalytic *** existing catalysts and their novel properties for enhanced CO_(2) methanation were elucidated using the state-of-the-art experimental and theoretical *** selection of an appropriate synthesis method,catalytic activity for CO_(2) methanation,deactivation of the catalysts,and reaction mechanisms studies,have been explicitly compared and ***,future efforts should be directed towards the sustainable developments of catalytic configurations for successful industrial applications of CO_(2) utilization to sNG using CO_(2) methanation.

关键词： CO_(2)utilization CO_(2)methanation sNG Catalytic systems Deactivation Mechanism

immunotherapeutic approaches in biliary tract carcinoma:Current status and emerging strategies

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World Journal of Gastrointestinal Oncology 2015年第11期7卷 338-346页

作者： Eric i Marks Nelson s Yee Department of Medicine Penn State Milton S.Hershey Medical Center Division of Hematology-Oncology Program of Experimental TherapeuticsDepartment of MedicinePenn State Hershey Medical CenterPenn State Hershey Cancer Institute

For biliary tract carcinoma(BTC),complete surgical resection of tumor is only feasible in a minority of patients,and the treatment options for patients with unresectable or metastatic disease are *** in cancer immunology have led to identification of tumor-infiltrating immune cells as indicators of prognosis and response to treatment in *** has also facilitated development of immunotherapy that focuses on enhancing the immune system against biliary *** includes peptide- and dendritic cell-based vaccines that stimulate in-vivo immune responses against tumorspecific *** immunotherapy,which entails the ex-vivo expansion of tumor-infiltrating immune cells for subsequent reintroduction,and cytokinebased therapies have been developed in *** studies indicate that this type of therapy is generally well *** therapy with dendritic cell-based vaccines and adoptive immunotherapy has shown particularly good *** strategies through discovery of novel antigen targets and by reversal of tumor-associated immunosuppression are expected to improve the efficacy of immunotherapy in *** efforts by integration of targeted immunotherapeutics with molecular profiling of biliary tumor will hopefully make a positive impact on advancing towards the goal of developing precision treatment of patients with this highly lethal disease.

关键词： Adoptive immunotherapy Cancer vaccines Biliary tra

Mathematical modeling of mixed convective MHD Falkner-skan squeezed sutterby multiphase flow with non-Fourier heat flux theory and porosity

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Applied Mathematics and Mechanics(English Edition) 2023年第11期44卷 2005-2018页

作者： shuguang Li M.i.KHAN F.ALi s.s.ABDULLAEV s.sAADAOUi HABiBULLAH school of Computer science and Technology Shandong Technology and Business UniversityYantai 264005Shandong ProvinceChina Department of Mechanics and Engineering science Peking UniversityBeijing 100871China Department of Mechanical Engineering Lebanese American UniversityBeirut 11020Lebanon Department of Mathematical sciences Federal Urdu University of ArtsSciences&TechnologyGulshan-e-IqbalKarachi 75300Pakistan Faculty of Chemical Engineering New Uzbekistan UniversityTashkent 100070Uzbekistan Department of science and innovation Tashkent State Pedagogical University named after NizamiTashkent 100070Uzbekistan Department of Physics Faculty of Science and ArtsMohayel AserKing Khalid UniversityAbha 61421Saudi Arabia state Key Laboratory of Turbulence and Complex system Collaborative Innovative Center for Advanced Aero-EnginesPeking UniversityBeijing 100871China

in a wide variety of mechanical and industrial applications,e.g.,space cooling,nuclear reactor cooling,medicinal utilizations(magnetic drug targeting),energy generation,and heat conduction in tissues,the heat transfer phenomenon is ***’s law of heat conduction has been used as the foundation for predicting the heat transfer behavior in a variety of real-world *** model’s production of a parabolic energy expression,which means that an initial disturbance would immediately affect the system under investigation,is one of its main ***,numerous researchers worked on such problem to resolve this *** last,this problem was resolved by Cattaneo by adding relaxation time for heat flux in Fourier’s law,which was defined as the time required to establish steady heat conduction once a temperature gradient is *** offered a material invariant version of Cattaneo’s model by taking into account the upper-connected derivative of the Oldroyd ***,both models are combinedly known as the Cattaneo-Christov(CC)*** this attempt,the mixed convective MHD Falkner-skan sutterby nanofluid flow is addressed towards a wedge surface in the presence of the variable external magnetic *** CC model is incorporated instead of Fourier’s law for the examination of heat transfer features in the energy expression.A two-phase nanofluid model is utilized for the implementation of *** nonlinear system of equations is tackled through the bvp4c technique in the MATLAB software *** influence of pertinent flow parameters is discussed and displayed through different *** and important results are summarized in the conclusion ***,in both cases of wall-through flow(i.e.,suction and injection effects),the porosity parameters increase the flow speed,and decrease the heat transport and the influence of drag forces.

关键词： sporosity Cattaneo-Christov(CC)heat flux model Falkner-skan sutterby nanofluid mixed convection stagnation point

Review of research and application of evaporative cooling in preservation of fresh agricultural produce

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international Journal of Agricultural and Biological Engineering 2014年第5期7卷 85-102页

作者： M.C.Ndukwu s.i.Manuwa Department of Agricultural and Bio-resources Engineering Michael Okpara University of AgricultureUmudike Umuahia Abia StateNigeria Department of Agricultural Engineering Federal University of Technology AkureP.M.B.704 AkureOndo StateNigeria

Extensive review of evaporative coolers for the preservation of fresh agricultural produce in some countries was *** of the designs employ mainly direct evaporative cooling methods which are simple but with lower thermal performance,and can only be used for short term storage of agricultural produce with moderate respiratory *** into novel technologies in evaporative cooling systems which can improve the cooling performances,such as membrane air treatments,dew point type and heat pipe type heat exchanger in indirect/direct evaporative cooling application,and their feasibilities in agricultural storage are either absent or *** kinds of materials especially agricultural residues have been used for air water contact in evaporative cooling in different climates,but most of the analyses focused on effect of air flow rate and pad thickness on the cooling effectiveness,and the energy efficiency and evaporation loss of these materials in most cases were not evaluated or *** paper highlights the prospects and constraints of commercialization and marketing of evaporative coolers in some developing countries,and the general weakness in researches and the ways forward in new area of research and development are concluded.

关键词： agricultural products evaporative cooling passive coolers active coolers pad materials

Landau quantization effects on damping Kawahara solitons in electron–positron–ion plasma in rotating ionized medium

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Communications in Theoretical Physics 2024年第10期76卷 141-150页

作者： E i El-Awady s Hussain N Akhtar Department of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Theoretical Physics Division(TPD) PINSTECHP.O.Nilore 45650IslamabadPakistan

For the dynamics of three-dimensional electron–positron–ion plasmas,a fluid quantum hydrodynamic model is proposed by considering Landau quantization effects in dense ***–neutral collisions in the presence of the Coriolis force are also *** application of the reductive perturbation technique produces a wave evolution equation represented by a damped Korteweg–de Vries *** equation,however,is insufficient for describing waves in our system at very low dispersion *** a result,we considered the highest-order perturbation,which resulted in the damped Kawahara *** effects of the magnetic field,Landau quantization,the ratio of positron density to electron density,the ratio of positron density to ion density,and the direction cosine on linear dispersion laws as well as soliton and conoidal solutions of the damped Kawahara equation are *** understanding from this research can contribute to the broader field of astrophysics and aid in the interpretation of observational data from white dwarfs.

关键词： Kawahara equation solitary and cnoidal waves quantum plasma magnetoplasmas Landau quantization Coriolis force

Flow and heat transfer of nanofluid past stretching/shrinking sheet with partial slip boundary conditions

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Applied Mathematics and Mechanics(English Edition) 2014年第11期35卷 1401-1410页

作者： s.MANsUR A.isHAK i.POP Department of Mathematics and statistics Faculty of Science Technology and Human Development Universiti Tun Hussein Onn Malaysia Centre of Modelling and Data Analysis School of Mathematical Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia Department of Mathematics Babes-Bolyai University

The boundary layer flow of a nanofluid past a stretching/shrinking sheet with hydrodynamic and thermal slip boundary conditions is studied. Numerical solutions to the governing equations are obtained using a shooting method. The results are found for the skin friction coefficient, the local Nusselt number, and the local sherwood number as well as the velocity, temperature, and concentration profiles for some values of the velocity slip parameter, thermal slip parameter, stretching/shrinking parameter, thermophoresis parameter, and Brownian motion parameter. The results show that the local Nusselt number, which represents the heat transfer rate, is lower for higher values of thermal slip parameter, thermophoresis parameter, and Brownian motion parameter.

关键词： boundary layer heat transfer nanofluid stretching/shrinking dual solution