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Novel hierarchical structure of MoS_(2)/TiO_(2)/Ti_(3)C_(2)T_(x) composites for dramatically enhanced electromagnetic absorbing properties

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Journal of Advanced Ceramics 2021年第5期10卷 1042-1051页

作者： Heng du Qipeng ZHANG Biao ZHAO frank MARKEN Qiancheng GAO Hongxia LU Li GUAN Hailong WANG Gang SHAO Hongliang XU Rui ZHANG Bingbing FAN School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China hKey Laboratory of Functional Molecular Solids Ministry of EducationAnhui Normal UniversityWuhu 241000China Henan Key L abomtory of Aeronautical Materials and Application Technology Zhengzhou University of AeronauticsZhengzhou 450046China Department of Chemistry University of BathClaverton DownBath BA27AYUK School of Materials Science and Engineering L uoyang Institute of Science and TechnologyLuoyang 471023China

In order to prevent the microwave leakage and mutual interference,more and more microwave absorbing devices are added into the design of electronic products to ensure its routine *** this work,we have successfully prepared MoS_(2)/TiO_(2)/Ti_(3)C_(2)T_(x) hierarchical composites by one-pot hydrothermal method and focused on the relationship between structures and electromagnetic absorbing *** by comprehensive characterizations,M0S_(2) nanosheets were proved to be anchored on the surface and interlayer of Ti_(3)C_(2)T_(x) through a hydrothermal ***,TiO_(2) nanoparticles were obtained in *** to these hierarchical structures,the MoS_(2)/TiO_(2)/Ti_(3)C_(2)T_(x) composites showed greatly enhanced microwave absorbing *** MoS_(2)/TiO_(2)/Ti_(3)C_(2)T_(x) composites exhibit a maximum reflection loss value of -33.5 dB at 10.24 GHz and the effective absorption bandwidth covers 3.1GHz(13.9-17 GHz)at the thickness of 1.0 mm,implying the features of wide frequency and light *** work in the hierarchical structure of MoS_(2)/TiO_(2)/Ti_(3)C_(2)T_(x) composites opens a promising door to the exploration of constructing extraordinary electromagnetic wave absorbents.

关键词： MoS_(2)/TiO_(2)/Ti_(3)C_(2)T_(x)hierarchical hybrids microwave absorbing properties dielectric loss

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Factors Influencing Technology Transfer for Sustainable Construction Management in Nigeria

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Engineering（科研） 2018年第11期10卷 769-783页

作者： Iroegbu Udochukwu frank Rong du Xidian University Xi’an China

The move to embrace sustainable building is an international paradigm with the desire for sustainable development in society. Developing countries, however, are the most susceptible regions to unsustainable development. This study focused on factors influencing Technology Transfer in Construction Management in Nigeria. Questionnaires were applied to collect primary data. A total of 55 registered architectures, quantity surveyors and engineers were interviewed. The data were analyzed and both descriptive and inferential statistics were applied in the study. The findings show that research on sustainability and involvement of stakeholders influence the success of technology transfer. These findings have managerial implications on technology transfer to attain sustained development in the construction industry for many developing countries.

关键词： Nigeria Technology Transfer Construction Management Sustainable Development

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Impact on Soil Organic C and Total Soil N from Cool- and Warm-Season Legumes Used in a Green Manure-Forage Cropping System

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Agricultural Sciences 2024年第3期15卷 333-357页

作者： Clark B. Neely Francis M. Rouquette Jr. Cristine L.S. Morgan frank M. Hons William L. Rooney Gerald R. Smith Department of Soil and Crop Science Washington State University Pullman WA USA Texas A&M AgriLife Research Overton TX USA Chief Scientific Officer Soil Health Institute Morrisville NC USA Department of Soil and Crop Science Texas A&M University College Station TX USA

Annual forage legumes are important components of livestock production systems in East Texas and the southeastern US. Forage legumes contribute nitrogen (N) to cropping systems through biological N fixation, and their seasonal biomass production can be managed to complement forage grasses. Our research objectives were to evaluate both warm- and cool-season annual forage legumes as green manure for biomass, N content, ability to enhance soil organic carbon (SOC) and soil N, and impact on post season forage grass crops. Nine warm-season forage legumes (WSL) were spring planted and incorporated as green manure in the fall. Forage rye (Secale cereale L.) was planted following the incorporation of WSL treatments. Eight cool-season forage legumes (CSL) were fall planted in previously fallow plots and incorporated as green manure in late spring. Sorghum-sudangrass (Sorghum bicolor x Sorghum bicolor var. sudanense) was planted over all treatments in early summer after forage rye harvest and incorporation of CSL treatments. Sorghum-sudangrass was harvested in June, August and September, and treatments were evaluated for dry matter and N concentration. Soil cores were taken from each plot, split into depths of 0 to 15, 15 to 30 and 30 to 60 cm, and soil C and N were measured using combustion analysis. Nylon mesh bags containing plant samples were buried at 15 cm and used to evaluate decomposition rate of above ground legume biomass, including change in C and N concentrations. Mungbean (Vigna radiata L. [Wilczek]) had the highest shoot biomass yield (6.24 t DM ha-1) and contributed the most total N (167 kg∙ha-1) and total C (3043 kg∙ha-1) of the WSL tested. Decomposition rate of WSL biomass was rapid in the first 10 weeks and very slow afterward. Winter pea (Pisum sativum L. spp. sativum), arrow leaf clover (Trifolium vesiculosum Savi.), and crimson clover (Trifolium incarnatum L.) were the most productive CSL in this trial. Austrian winter pea

关键词： Annual Legumes Soil N Soil Organic C Green Manure Deer Browse Forage Cropping Systems

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Asymptotics and Blow-up for Mass Critical Nonlinear Dispersive Equations(Dedicated to Professor Ham Brezis on the occasion of his 70th birthday)

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Chinese Annals of Mathematics,Series B 2017年第2期38卷 579-590页

作者： frank MERLE Universitéde Cergy-pontoise MathématiquesCNRSCNRSF-95000 Cergy-PontoiseFrance Institut des HautesEtudes Scientifiques 35 Route de Chartres91440 Bures-sur-YvetteFrance

The author considers mass critical nonlinear Schrdinger and Korteweg-de Vries equations. A review on results related to the blow-up of solution of these equations is given.

关键词： Dispersive nonlinear PDE, Criticality, Asymptotics, Blow-up, Globalsolution, Soliton

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Constructing parametric triangular patches with boundary conditions

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Progress in Natural Science:Materials International 2008年第3期18卷 315-322页

作者： frank Cheng Department of Computer Science University of Kentucky Lexington KY 40506 USA

The problem of constructing a parametric triangular patch to smoothly connect three surface patches is studied. Usually, these surface patches are defined on different parameter spaces. Therefore, it is necessary to define interpolation conditions, with values from the given surface patches, on the boundary of the triangular patch that can ensure smooth transition between different parameter spaces. In this paper we present a new method to define boundary conditions. Boundary conditions defined by the new method have the same param- eter space if the three given surface patches can be converted into the same form through affine transformation. Consequently, any of the classic methods for constructing functional triangular patches can be used directly to construct a parametric triangular patch to connect given surface patches with G1 continuity. The resulting parametric triangular patch preserves precision of the applied classic method.

关键词： Triangular patch Parametric interpolation Determination of interpolation conditions

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Poly(ethylene glycol) conjugated nano-graphene oxide for photodynamic therapy

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Science China Chemistry 2010年第11期53卷 2265-2271页

作者： Pilger frank Institute for Advanced Materials and Nano Biomedicine(iNANO) Tongji University

A novel methoxy-poly(ethylene glycol) modified nano-graphene oxide(NGO-mPEG) was designed and synthesized as a photosensitizer(PS) carrier for photodynamic therapy of *** with a size below 200 nm was prepared using a modified Hummers' *** was observed by AFM to exhibit a structure with single-layer graphene oxide sheets down to a few nanometers in *** mPEG conjugation of NGO(NGO-mPEG) was found to enhance solubility in cell culture *** apparent cytotoxicity of the NGO-mPEG was observed towards MCF-7 carcinoma cell *** phthalocyanine(ZnPc),a photosensitizer for photodynamic therapy,was loaded in the NGO-PEG through π-π stacking and hydrophobic interactions,with the drug loading efficiency up to 14 wt%.Hydrophobic ZnPc was internalized in MCF-7 cells,exhibiting a pronounced phototoxicity in the cells under Xe light *** results indicate a great potential of NGO-mPEG for photodynamic therapy of cancer.

关键词： nano-graphene oxide photodynamic therapy photosensitizer drug delivery biomedical application

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Climatic and non-climatic factors driving the livelihood vulnerability of smallholder farmers in Ahafo Ano North District,Ghana

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Regional Sustainability 2024年第3期5卷 24-39页

作者： frank BAFFOUR-ATA Louisa BOAKYE Moses Tilatob GADO Ellen BOAKYE-YIADOM Sylvia Cecilia MENSAH Senyo Michael KWAKU KUMFO Kofi Prempeh OSEI OWUSU Emmanuel CARR Emmanuel DZIKUNU Patrick DAVIES Department of Environmental Science Kwame Nkrumah University of Science and TechnologyKumasiAK-039-5028Ghana Department of Meteorology and Climate Science Kwame Nkrumah University of Science and TechnologyKumasiAK-039-5028Ghana

Smallholder farmers in Ahafo Ano North District,Ghana,face multiple climatic and non-climatic *** study assessed the factors contributing to the livelihood vulnerability of smallholder farmers in this district by household surveys with 200 respondents and focus group discussions(FGDs)with 10 *** Mann–Kendall trend test was used to assess mean annual rainfall and temperature trends from 2002 to *** relative importance index(RII)value was used to rank the climatic and non-climatic factors perceived by *** socioeconomic characteristics affecting smallholder farmers’perceptions of climatic and non-climatic factors were evaluated by the binary logistic regression *** showed that mean annual rainfall decreased(P>0.05)but mean annual temperature significantly increased(P<0.05)from 2002 to 2022 in the *** key climatic factors perceived by smallholder farmers were extreme heat or increasing temperature(RII=0.498),erratic rainfall(RII=0.485),and increased windstorms(RII=0.475).The critical non-climatic factors were high cost of farm inputs(RII=0.485),high cost of healthcare(RII=0.435),and poor condition of roads to farms(RII=0.415).Smallholder farmers’perceptions of climatic and non-climatic factors were significantly affected by their socioeconomic characteristics(P<0.05).This study concluded that these factors negatively impact the livelihoods and well-being of smallholder farmers and socioeconomic characteristics influence their perceptions of these ***,to enhance the resilience of smallholder farmers to climate change,it is necessary to adopt a comprehensive and context-specific approach that accounts for climatic and non-climatic factors.

关键词： Smallholder farmers Livelihood vulnerability Climate change Socioeconomic characteristics Food security Ghana

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Legume Green Manure and Intercropping for High Biomass Sorghum Production

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Agricultural Sciences 2024年第6期15卷 605-621页

作者： Clark B. Neely Francis M. Rouquette Jr. Cristine L. S. Morgan frank M. Hons William L. Rooney Gerald R. Smith Department of Soil and Crop Science Washington State University Pullman WA USA Texas A&M AgriLife Research Overton TX USA Soil Health Institute Morrisville NC USA Department of Soil and Crop Science Texas A&M University College Station TX USA

Before the advent of cheap, synthetic fertilizers, legumes were commonly used as green manure crops for their ability to fix atmospheric nitrogen (N). A three-year study at Overton, TX examined legume integration into high-biomass sorghum (Sorghum bicolor L.) production systems on a Lilbert loamy fine sand recently cultivated after a fertilized bermudagrass [Cynodon dactylon (L.) Pers.] pasture. In this split-split plot design, ‘Dixie’ crimson clover (Trifolium incarnatum L.) and ‘Iron and Clay’ cowpea (Vigna unguiculata L.) were integrated into a high-biomass sorghum production system to evaluate impacts on N concentration, C concentration, and yield of high-biomass sorghum and their impacts on soil total N and soil organic carbon (SOC). Main plots were split into crimson clover green manure (CLGM) and winter fallow (FALL) followed by three sub-plots split into warm-season crop rotations: cowpea green manure (CPGM), cowpea-sorghum intercrop (CPSR), and sorghum monocrop (SORG). Three N fertilizer treatments (0, 45, 90 kg N∙ha−1) were randomized and applied as sub-sub plots. The CLGM increased (P sorghum biomass yield (16.5 t DM∙ha−1) 28% in year three but had no effect in the first two years. The CPSR treatment reduced sorghum yield up to 62% compared to SORG;whereas CPGM increased sorghum yield 56% and 18% the two years following cowpea incorporation. Rate of N fertilizer had no effect on sorghum biomass yield. Decrease in SOC and soil N over time indicated mineralization of organic N and may explain why no N fertilizer response was observed in sorghum biomass yield. Cowpea showed strong potential as a green manure crop but proved to be too competitive for successful intercropping in high-biomass sorghum production systems.

关键词： High-Biomass Sorghum Legumes Green Manure Intercrop Cowpea Crimson Clover Soil Organic Carbon Soil Nitrogen

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中国留学生跨文化能力发展探究——以中国在英留学生为例

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武汉冶金管理干部学院学报 2024年第2期34卷 43-47页

作者：徐航张鑫长春光华学院跨文化研究院吉林长春130033 云南师范大学外国语学院云南昆明650500

随着后疫情时代的到来和中美局势的发展,目前英国已经成为中国学生出国留学的首选之地。以20位留英中国学生为研究对象,首先借助Bennett的跨文化敏感性发展模型来剖析他们留学英国过程中的跨文化能力发展状态;进而从Byram的跨文化能力... 详细信息

随着后疫情时代的到来和中美局势的发展,目前英国已经成为中国学生出国留学的首选之地。以20位留英中国学生为研究对象,首先借助Bennett的跨文化敏感性发展模型来剖析他们留学英国过程中的跨文化能力发展状态;进而从Byram的跨文化能力模型视角出发,探讨国内高校在培养学生跨文化能力方面可以从中得到的借鉴和启示。

关键词：中国留学生跨文化能力跨文化敏感性中国在英留学生

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Progress in twin roll casting of magnesium alloys: A review

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Journal of Magnesium and Alloys 2021年第2期9卷 362-391页

作者： Amjad Javaid frank Czerwinski CanmetMATERIALS Natural Resources CanadaHamiltonOntarioL8P 0A5Canada

Twin roll casting was commercialized for a strip production from ferrous and non-ferrous alloys in the 1950 s;however,its application to magnesium has proven difficult and still creates major *** report describes global efforts in expanding manufacturing capabilities of magnesium sheet through twin roll casting path,offering many benefits,including a reduction in number of processing steps and energy *** addition to hardware design,alloy transformation during processing,product microstructure and properties,examples of successful solutions along with present technology and knowledge limitations are discussed.A particular attention is paid to developments at Canmet MATERIALS,having the only in North America pilot scale twin roll casting facility,devoted to *** are described that aim at design of new magnesium alloys,which could take advantage of unique processing conditions during twin roll casting and contribute to the overall progress in magnesium sheet manufacturing.

关键词： Twin roll casting Magnesium alloys Solidification Magnesium sheet

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