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International Journal of Disaster Risk science 2023年第5期14卷 713-721页

作者： s.E.Galaitsi Elizaveta Pinigina Jeffrey m.Keisler Gianluca Pescaroli Jesse m.Keenan Igor Linkov Us Army Engineer Research and Development Center VicksburgMS39180USA College of m.nagement University of Massachusetts BostonBostonMA02125USA Institute for Risk and Disaster Reduction University College LondonLondonWC1E 6BTUK school of Architecture Tulane UniversityNew OrleansLA70118USA

The concepts of business continuity m.nagement,operational resilience,and organizational resilience each refer to actions that businesses and organizations can take in anticipating and responding to ***,the existing definitions and usages are difficult to differentiate due to overlapping objectives,implementation processes,and *** article examines definitions and approaches for these three concepts and suggest a framework to operationalize methods and tools relevant to *** definitions emphasize three dyads:risk versus resilience;organizational processes versus assets;and normal operating conditions versus crisis *** these dyads to differentiate the concepts of business continuity m.nagement,operational resilience,and organizational resilience can support planners in clarifying objectives and identifying which approach will be most beneficial as businesses or organizations plan for and encounter *** article evaluates these concepts by examining illustrative examples of disruptions and responses.

关键词： Business continuity m.nagement Disruptions Operational resilience Organizational resilience

Cataracting-centrifuging transition investigation using nonspherical and spherical particles in a rotary drum through CFD simulations

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Particuology 2022年第1期20卷 48-60页

作者： Wanessa m.Benedito Claudio R.Duarte marcos A.s.Barrozo Dyrney A.santos Institute of Chemistry Federal University of Goias-UFGCampus SamambaiaGoianiaGO74690-900Brazil school of Chemical Engineering Federal University of Uberlandia-UFUCampus Santa MonicaUberlandiaMG38408-144Brazil

This paper aims to systematically investigate the cataracting-centrifuging transition in a rotary drum involving spherical and nonspherical particles by using the multiphase Granular Eulerian model(mGEm).The effects of drum length and particle shape on the cataracting-centrifuging transition behavior were *** results showed that drum length plays an important role in the cataracting-centrifuging transition,although most related works in the literature do not consider *** particle shape also significantly affects the cataracting-centrifuging transition *** particles required lower rotation speeds than spherical particles to reach the centrifuging *** particle shape was shown to be related to the critical solid fraction(asc)from schaeffer’s model,although further investigations are required to completely correlate particle spherecity with critical solid volume fractions.

关键词： Frictional viscosity mGEm model Particle shape Drum length Drum flow regimes

Assessment of biogas generation potential from slaughterhouse wastes in Dhaka city,Bangladesh

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Waste Disposal and sustainable Energy 2021年第1期3卷 41-48页

作者： sayedus salehin syed shaheer Uddin Ahmed md.Ehasanul Hoque md.salauddin mrigdad s.m.Ashef Hussain s.m.Tahsin Intisar Department of mechanical and Production Engineering Islamic University of TechnologyBoard BazarGazipur 1704Bangladesh school of mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Tampere University of Technology Korkeakoulunkatu 7 Kampusareena33720 TampereFinland Department of Electrical and Electronic Engineering American International University BangladeshBananiDhaka 1213Bangladesh

slaughterhouse waste is a highly energy-rich waste and is an attractive material to treat through anaerobic digestion to produce *** could be burned to provide heating and electricity or can be converted to bio-methane to be used as *** can also aid in waste m.nagement and evidently reduce the ecological and environmental *** this paper,the potential of biogas generation from the slaughterhouses in Dhaka is *** in 21 regions in Dhaka city have been surveyed for data collection and *** study estimates that approximately 7915 tons of slaughterhouse waste are generated annually from the slaughterhouses in Dhaka city which has the potential to generate 2.15 mm^(3) of biogas.A case study on the biggest government registered slaughterhouse is also demonstrated regarding generating electricity.

关键词： Biogas slaughterhouse waste Electricity Clean energy Energy recovery

Enantiomeric hybrid high-temperature multiaxial ferroelectrics with a narrow bandgap and high piezoelectricity

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中国化学快报:英文版 2023年第8期34卷 462-466页

作者： Chang-Feng Wang na Wang Lang Liu Le-Ping miao Heng-Yun Ye Yi Zhang Chao shi Chaotic matter science Research Center Department of MaterialsMetallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China

Ferroelectric semiconductors have sparked growing attention in the field of optoelectronics,due to their unique ferroelectric photovoltaic ***,substantial efforts have been devoted to the development of ferroelectric semiconductors,including inorganic oxides,organic-inorganic hybrids,and metal-free ***,reports of ferroelectric semiconductors with a bandgap of less than 2 eV have been ***,in combination with the incorporation of triiodide(I_(3)−)and the introduction of chiral cations,we successfully constructed a pair of enantiomeric organic-inorganic hybrid ferroelectric semiconductors,(s-1,2-DAP·I)_(4)·I_(3)·BiI_(6)and(R-1,2-DAP·I)_(4)·I_(3)·BiI_(6)(R/s-1,2-DAP=(R/s)-(–)-1,2-diaminopropane),which possess high-temperature multiaxial ferroelectric phase transition with an Aizu notation of 422F2(s)at 405 K,a narrow bandgap of 1.56 eV comparable to that of CH3NH3PbI_(3)(∼1.5 eV),and an impressive piezoelectric response(piezoelectric coefficient,d22 of 35 pC/N)on par with PVDF(polyvinylidene fluoride,30 pC/N).With intriguing attributes,(s-1,2-DAP·I)_(4)·I_(3)·BiI_(6)and(R-1,2-DAP·I)_(4)·I_(3)·BiI_(6)exhibit great potential for application of self-power polarized-light detection and piezoelectric sensors.

关键词： Chirality Hybrid materials multiaxial ferroelectrics semiconductors Piezoelectricity

Bulk heterojunction thin film formation by single and dual feed ultrasonic spray method for application in organic solar cells

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Journal of semiconductors 2016年第9期37卷 47-50页

作者： D.m.marathe H.s.Tarkas m.s.mahajan G.s.Lonkar s.R.Tak J.V.sali Organic Photovoltaic Laboratory North Maharashtra UniversityJalgaon(MS)425001India

We here present a way of preparing the polymer： fullerene BHJ using dual feed method which can lead to formation of pure phases. In this report, we present results of our initial experiments in this *** effect of process parameters on the thickness and surface roughness of the active layer has been *** structural and optical properties have been studied using the optical microscope, UV–visible spectroscopy and photoluminescence spectroscopy. significant PL quenching indicates efficient charge separation in the BHJ formed using this technique. We have also compared the BHJ thin films prepared with this dual feed ultrasonic technique with the single feed spray method. The BHJ formed using this technique has been used as an active layer in OsC.

关键词： P3HT PCBm dual feed ultrasonic spray method organic solar cell

saxicolous lichen communities in three basins associated with mining activity in northwestern Argentina

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Journal of Arid Land 2023年第8期15卷 989-1005页

作者： Juan m HERNÁNDEZ Renato A GARCÍA Edith R FILIPPINI Cecilia EsTRABOU martha s CAÑAs Juan m RODRÍGUEZ Faculty of Technology and Applied sciences Regional Centre of Energy and Environment for Sustainable DevelopmentNational University of CatamarcaCatamarca 4700Argentina Laboratory of Biodiversity and Environmental Genetics National University of AvellanedaAvellaneda 1870Argentina Institute of Biological and Technological Research Centre for Ecology and Renewable Natural ResourcesFaculty of ExactPhysical and Natural SciencesNational University of CordobaCordoba 5000Argentina

mining activity affects the vegetation and soils of the ***,the effects of mining activity on saxicolous lichen communities are less ***,the aim of this study was to characterize saxicolous lichen communities in three basins(Vis-Vis River basin,Poteros River basin,and Capillitas River basin)surrounding metalliferous mining projects of different types of operation and at different stages of exploitation.A large-scale mine(Bajo de la Alumbrera)with more than 25 a of open-pit mining located in the Vis-Vis River basin(CRV).A pre-exploitation mine(Agua Rica)located in the Poteros River basin(CRP),and a small-scale mine(m.nas Capillitas)with more than 160 a of underground mining located in the Capillitas River basin(CAC).In each basin,species richness,cover,and frequency of lichen communities were measured on 40 rock ***,explanatory variables were recorded,i.e.,altitude,slope,aspect,vegetation cover,rock,and soil cover around the rocky area *** and total cover of lichen communities were analysed using linear models,and species composition was explored using multivariate ordination *** showed that a total of 118 lichen species were *** species richness differed among basins and the lichen composition present in areas close to mining sites responded mainly to basins,altitude,and microsite *** lichen cover showed no difference among basins,but it changed under different rock and vegetation *** was not possible to quantify the effects of mining activity on species richness and ***,the low richness values found in the downstream of minera Alumbrera could be associated with the negative impact of open-pit ***,the effects of large-scale mining activity on lichen communities needs more investigation.

关键词： lichen community altitude microsite metalliferous mining vegetation

Holmium Oxide Film as a saturable Absorber for 2μm Q-switched Fiber Laser

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Chinese Physics Letters 2017年第5期34卷 48-51页

作者： m.F.A.Rahman m.F.m.Rusdi m.Q.Lokman m.B.H.mahyuddin A.A.Latiff A.H.A.Rosol K.Dimyati s.W.Harun Department of Electrical Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Centre University of Malaya Kuala Lumpur 50603 Malaysia Faculty of Electrical Engineering University Teknologi Mara Shah Alam 40450 Malaysia

This work reports on the use of the holmium oxide （Ho2O3） polymer film as a saturable absorber （sA） for generating stable Q-switching pulses operating in a 2μm region in a thulium-doped fiber laser cavity. The sA is prepared by diluting a commercial Ho3O2 powder and then mixing it with polyvinyI alcohol （PVA） solution to form a Ho2O3-PVA film. A tiny part of the film about 1mm×1 mm in size is sandwiched between two fiber ferrules with the help of index matching gel. When incorporated in a laser cavity driven by a 1552-nm pump, stable Q-switching pulses are observed at 1955nm within the pump power range of 363 491 roW. As the pmnp power increases within this range, the repetition rate rises from 26 kHz to 39 kHz, as the pulse width drops from 4.22μs to 2.57μs. The laser operates with a signal-to-noise ratio of 47dB, and the maximum output power and the pulse energy obtained are 2.67mW and 69ng, respectively. Our results successfully demonstrate that the Ho2O3 film can be used as a passive sA to generate a 2μm pulse laser.

关键词： m Q-switched Fiber Laser sA FEsEm

structural and optical properties of CZTs nanoparticles prepared by a colloidal process

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Rare metals 2021年第9期40卷 2602-2609页

作者： R.Aruna-Devi m.Latha s.Velumani JoséÁlvaro Chávez-Carvayar Program on nanoscience and nanotechnology CINVESTAV-IPNSan Pedro Zacatenco07360 Mexico CityMexico CIICAp-UAEm Av.Universidad 1001.Col.Chamilpa62209 CuernavacaMorelosMexico Department of Electrical Engineering(sEEs) CINVESTAV-IPNSan Pedro Zacatenco07360 Mexico CityMexico Instituto de Investigaciones en materiales UNAM04510 Mexico CityMexico

This research presents the influence of copper(Cu) concentration on the properties of copper zinc tin sulfide(CZTs) nanoparticles(NPs) synthesized by a colloidal method, employing oleylamine as an organic solvent. From the structural analysis, a pure phase of CZTs was obtained at an optimized molar ratio of 1.8:1.1:1:4,and secondary phases were observed as the Cu concentration increased. The increment of the NPs size from 15 to50 nm was noticed as a function of Cu ***, the optical bandgap energy was tuned from1.35 to 1.68 eV with respect to Cu concentration. The sample synthesized at the molar ratio of 1.8:1.1:1:4 showed a pure phase CZTs with desired elemental composition and bandgap. Furthermore, CZTs thin films were prepared by a doctor-blade method using synthesized NPs followed by annealing under a sulfur/nitrogen atmosphere. The annealed CZTs film showed a significant improvement in the morphological, electrical and optoelectronic ***, the annealed CZTs film can be efficiently used as an absorber layer in low-cost thin film solar cells.

关键词： CZTs Copper concentration nanoparticles Thin film Annealing

Characteristics of rock fragments in different forest stony soil and its relationship with macropore characteristics in mountain area, northern China

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Journal of mountain science 2018年第3期15卷 519-531页

作者： mENG Chen NIU Jian-zhi YIN Zheng-cong LUO Zi-teng LIN Xing-na JIA Jing-wei College of soil and Water Conservation Beijing Forestry University Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees Beijing University of Agriculture Department of Geography Texas A&M University College Station

Rock fragments have major effect on soil macropores and water movement. However, the characteristics of rock fragments and their relationship with macropore characteristics remain elusive in forest stony soils in northern mountainous area of China. The objectives of this study are to(1) use Industrial Computed Tomography(CT) scanning to quantitatively analyze rock fragment characteristics in intact soil columns in different forest lands and(2) identify the relationship between characteristics of rock fragments and that of the macropores. Intact soil columns that were 100 mm in diameter and 300 mm long were randomly taken from six local forest stony soils in Wuzuolou Forest station in miyun, Beijing. Industrial CT was used to scan all soil column samples, and then the scanned images were utilized to obtain the three-dimensional(3 D) images of rock fragments and macropore structures. Next, theparameters of the rock fragments and macropore structure were measured, including the volume, diameter, surface area, and number of rock fragments, as well as the volume, diameter, surface area, length, angle, tortuosity and number of macropores. The results showed that no significant difference was found in soil rock fragments content in the 10-30 cm layer between mixed forest and pure forest, but in the 0-10 cm soil layer, the rock fragments in mixed forest were significantly less than in pure forest. The number density of macropores has significant negative correlation with the number of rock fragments in the 0-10 cm soil layer, whereas this correlation is not significant in 10-20 cm and 20-30 cm soil layers. The volume density of macropore was not correlated with the volume density of rock fragments, and there is no correlation between the density of macropore surface area and the density of rock fragment surface area. Industrial CT scanning combined with image processing technology canprovide a better way to explore 3 D distribution of rock fragments in soil. The content of

关键词： Rock fragment macropore Forest stone soil mountain area Industrial Computed Tomography

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一种军工车间生产安全风险管控的解决方案

机电产品开发与创新 2024年第1期37卷 174-177页

作者：张弦弦徐曼菲张军娜刘治红中国兵器装备集团自动化研究所有限公司智能制造事业部四川绵阳621000

针对军工制造企业自动化程度低、作业现场人员多、安全监管力度不足,生产安全管控各自为政、缺乏整体规划等一系列突出问题,提出了一种生产安全风险管控的解决方案,包括生产现场安全风险感知、网络传输、数据中心、安全风险管控四个部分... 详细信息

针对军工制造企业自动化程度低、作业现场人员多、安全监管力度不足,生产安全管控各自为政、缺乏整体规划等一系列突出问题,提出了一种生产安全风险管控的解决方案,包括生产现场安全风险感知、网络传输、数据中心、安全风险管控四个部分,实现了对生产安全风险因素的评估、分析、监控、预警及联动处置。该解决方案在某军工制造企业得到了应用及验证,结果证明:方案能实现军工制造企业生产过程中安全风险的“可知可控”,有效降低引发安全事故的几率,满足企业“安全、绿色”的智能制造目标。

关键词：安全风险因素数字化建模可视化监控联动处置智能感知与管控

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