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Removal of virus aerosols by the combination of filtration and UV-c irradiation

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 1-9页

作者： Min Shang Yadong Kong Zhijuan Yang Rong cheng xiang Zheng yi Liu Tongping chen School of Environment and Natural Resources Renmin University of ChinaBeijing 100872China Sichuan Solid Waste and Chemicals Management Center Chengdu 610031China Biogas Institute of Ministry of Agriculture and Rural Affairs Chengdu 610041China

The COVID-19 pandemic remains ever prevalent and afflicting—partially because one of its transmission pathways is *** the widely used central air conditioning systems worldwide,indoor virus aerosols can rapidly migrate,thus resulting in rapid infection *** is therefore important to install microbial aerosol treatment units in the air conditioning systems,and we herein investigated the possibility of combining such filtration with UV irradiation to address virus *** showed that the removal efficiency of filtration towards f2 and MS2 phages depended on the type of commercial filter material and the filtration speed,with an optimal velocity of 5 cm/s for virus ***,it was found that UV irradiation had a significant effect on inactivating viruses enriched on the surfaces of filter materials;MS2 phages had greater resistance to UV-C irradiation than f2 *** optimal inactivation time for UV-C irradiation was 30 min,with higher irradiation times presenting no substantial increase in inactivation ***,excessive virus enrichment on the filters decreased the inactivation *** inactivation is therefore *** general,the combined system involving filtration with UV-C irradiation demonstrated a significant removal effect on virus ***,the system is simple and economical,making it convenient for widespread implementation in air-conditioning systems.

关键词： Filtration system UV-C irradiation Virus aerosol Public health COVID-19

Direct Z-scheme CdFe_(2)O_(4)/g-C3N4 hybrid photocatalysts for highly efficient ceftiofur sodium photodegradation

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Journal of Materials Science & Technology 2020年第21期56卷 133-142页

作者： Miao-Miao Fang Jun-Xia Shao xiang-Gang Huang Jin-yi Wang Wei chen School of Pharmaceutical and Materials Engineering Taizhou UniversityTaizhou 318000China

A direct Z-scheme CdFe_(2)O_(4)/g-C3N4 hybrid systems with different weight ratios of CdFe2O4 nanoparticles were successfully designed and constructed for ceftiofur sodium *** as-obtained CdFe_(2)O_(4)/g-C_(3)N_(4) hybrid samples composed of CdFe_(2)O_(4) nanoparticles and g-C3N4 nanosheets were systematically characterized by different techniques including X-ray diffraction,scanning electron microscope,transmission electron microscope,Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,UV–vis DRS,chemical oxygen demand,inductively coupled plasma mass spectrometer,photochemical test and electron spin resonance spectrometer *** optimal photocatalytic activity for ceftiofur sodium photodegradation was achieved by modulating the weight ration between CdFe_(2)O_(4) nanoparticles and g-C_(3)N_(4) *** result from photocatalytic tests indicate that Cd Fe_(2)O_(4)/g-C_(3)N_(4)-2 hybrid sample exhibit highly efficient photocatalytic activity towards ceftiofur sodium removal in comparison with pristine CdFe_(2)O_(4) nanoparticles and pure g-C_(3)N_(4) *** the excellent photocatalytic stability of CdFe_(2)O_(4)/g-C_(3)N_(4)-2 hybrid sample was also verified during recycling runs towards photocatalytic ceftiofur sodium *** significant enhancement of photocatalytic activity was attributed to the Z-scheme charge separation and transfer based on the construction of tight heterogeneous interface and well-matched band *** expect this research to provide a new insight into the design and preparation of direct Z-scheme hybrid photocatalysts for environmental remediation.

关键词： CdFe2O4 g-C3N4 Z-scheme Photodegradation

Effect of different bottom blowing elements on stirring characteristics of molten bath in converter

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Journal of Iron and Steel Research International 2024年第2期31卷 368-376页

作者： Ming Lv Shuang-ping chen Hong-min Guo yi-jie Hao xiang-dong Xing School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina Shaanxi Longmen Steel Company Hancheng715405ShaanxiChina

The bottom blowing element is the key equipment to ensure the bottom blowing effect of the *** types of bottom blowing elements,dispersive type(D1),double circular seam(D2)and straight cylinder type(D3),were built,and the effects of bottom blowing element type on molten bath flow,wall erosion and furnace bottom erosion were *** was found that when the bottom blowing elements of dispersive type(D1)and double circular seam(D2)were used,the dead zone area in the lower part of the molten bath was smaller,and the high-speed zone area was larger;therefore,the stirring effect on the bottom melt was *** the straight cylinder type(D3)bottom blowing element was used,the gas penetrated the molten bath at a faster rate to reach the surface of molten bath and failed to disperse in the bottom molten bath,and the wall shear stress near the nozzle outlet was *** argon was blown by three different bottom blowing elements,the area of the wall shear stress greater than 3 Pa was 4.8,5.6 and 8.7 cm2,respectively,within 0.2 m of the bottom blowing nozzle outlet.

关键词： Converter steelmaking Bottom blowing element Molten bath stirring Wall erosion

Effects of landscape fragmentation of plantation forests on carbon storage in the Loess Plateau,China

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Journal of Arid Land 2024年第2期16卷 266-281页

作者： LEI Hangyu DUAN Dantong chen yi GUO Huifeng LI Jiangtao LI xiang College of Landscape Architecture and Art Northwest A&F UniversityYangling 712100China

Tree plantation and forest restoration are the major strategies for enhancing terrestrial carbon sequestration and mitigating climate *** Grain for Green Project in China has positively impacted global carbon sequestration and the trend towards fragmentation of plantation *** studies have been conducted on changes in plantation biomass and stand structure caused by fragmentation,and the effect of fragmentation on the carbon storage of plantation forests remains *** study evaluated the differences between carbon storage and stand structure in black locust forests in fragmented and continuous landscape in the Ansai District,China and discussed the effects of ecological significance of four landscape indices on carbon storage and tree *** used structural equation modelling to explore the direct and indirect effects of fragmentation,edge,abiotic factors,and stand structure on above-ground carbon *** at breast height(DBH)in fragmented forests was 53.3%thicker,tree density was 40.9%lower,and carbon storage was 49.8%higher than those in continuous forests;for all given DBH>10 cm,the trees in fragmented forests were shorter than those in continuous *** patch area had a negative impact on carbon storage,i.e.,the higher the degree of fragmentation,the lower the density of the tree;and fragmentation and distance to edge(DTE)directly increased canopy ***,canopy coverage directly decreased carbon storage,and fragmentation directly increased carbon storage and tree *** non-commercial forests,fragmentation reduces the carbon storage potential of plantation,and the influence of patch area,edge,and patchy connection on plantation should be considered when follow-up trees are planted and for the plantation ***,expanding the area of plantation patches,repairing the edges of complex-shaped patches,enhancing the connectivity of similar patches,and applying nutrients to plantation forests at regular i

关键词： landscape fragmentation plantation carbon storage tree allometry tree density structural equation modelling

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石膏及白虎汤清热泻火功效的实验研究

现代中药研究与实践 2009年第2期23卷 48-51页

作者：夏怡李祥陈建伟王敏芳南京中医药大学药学院江苏南京210046

目的研究石膏的清热泻火药理作用。方法以干酵母及2,4-二硝基苯酚复制大鼠发热模型,对石膏、白虎汤、去石膏白虎汤,以及煅石膏和CaSO4?2H2O分别代替石膏入白虎汤的退热作用进行药效学观察,以证实石膏及白虎汤的清热功效;以伊文思蓝为指... 详细信息

目的研究石膏的清热泻火药理作用。方法以干酵母及2,4-二硝基苯酚复制大鼠发热模型,对石膏、白虎汤、去石膏白虎汤,以及煅石膏和CaSO4?2H2O分别代替石膏入白虎汤的退热作用进行药效学观察,以证实石膏及白虎汤的清热功效;以伊文思蓝为指示剂,根据伊文思蓝在小肠内的推进率,观察单味石膏对小鼠肠蠕动的影响,以证实石膏促进肠蠕动的作用。结果对干酵母及2,4-二硝基苯酚所致大鼠的发热,白虎汤有显著退热作用,;去石膏的白虎汤退热作用不明显,单味石膏、煅石膏或CaSO4?2H2O入方剂均无退热作用。单味石膏具有明显的促进小鼠肠蠕动的作用。结论石膏具有清热的功效,在复方中效果显著。单味石膏具有促进肠蠕动的作用。

关键词：石膏白虎汤退热肠蠕动

A Fast Evolutionary Learning to Optimize CNN

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Chinese Journal of Electronics 2020年第6期29卷 1061-1073页

作者： chen Jinyin LIN xiang GAO Shangtengda XIONG Hui ZHANG Longyuan LIU yi XUAN Qi College of Information Engineering Zhejiang University of Technology NESA Lab Zhejiang University

Deep neural networks(DNNs) show great performance in lots of *** neural network(CNN) is one of the classic DNNs,and various modified CNNs have been brought up,such as DenseNet,GoogleNet,ResNet,*** diverse tasks,a unique structure of CNN may show its ***,how to design an effective CNN model for a practical task is a *** this paper,we model the architecture optimization of CNN as an optimization problem and design a Genetic network programming based Fast evolutionary learning(GNP-FEL) to optimize ***-FEL contains three main ideas:First GNP is adopted to optimize CNN architecture and hyperparameters,which can build diverse network structures and make network parameters selfevolve;Second multi-objective optimization is designed by balancing both CNN model efficiency and structure compactness;Last a novel incremental training method is proposed to train offspring CNN models in GNP,which is capable of reducing time complexity *** have validated that GNP-FEL can quickly evolve a CNN classifier with a sufficiently compact *** the classifier has a comparable classification effect to state-ofthe-art CNN model.

关键词： Optimisation techniques CNN classifier Other topics in statistics multiobjective optimization architecture optimization optimize CNN Combinatorial mathematics DNN GNP-FEL genetic network programming diverse network structures structure compactness network parameters state-ofthe-art CNN model deep neural networks optimization problem CNN model genetic algorithms diverse tasks convolutional neural nets offspring CNN models neural net architecture practical task convolutional neural network Neural computing techniques learning (artificial intelligence) Knowledge engineering techniques fast evolutionary learning

Enhanced efficiency of the Sb_(2)Se_(3)thin-film solar cell by the anode passivation using an organic small molecular of TCTA

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Journal of Semiconductors 2023年第8期44卷 62-67页

作者： Yujie Hu Zhixiang chen yi xiang Chuanhui cheng Weifeng Liu Weishen Zhan School of Physics Dalian University of TechnologyDalian 116024China Mechanical and Electrical Engineering College Hainan UniversityHaikou 570228China

Antimony selenide(Sb_(2)Se_(3))is an emerging solar cell ***,we demonstrate that an organic small molecule of 4,4',4''-tris(carbazol-9-yl)-triphenylamine(TCTA)can efficiently passivate the anode interface of the Sb_(2)Se_(3)solar *** fabricated the device by the vacuum thermal evaporation,and took ITO/TCTA(3.0 nm)/Sb_(2)Se_(3)(50 nm)/C60(5.0 nm)/Alq3(3.0 nm)/Al as the device architecture,where Alq3 is the tris(8-hydroxyquinolinato)*** introducing a TCTA layer,the open-circuit voltage is raised from 0.36 to 0.42 V,and the power conversion efficiency is significantly improved from 3.2%to 4.3%.The TCTA layer not only inhibits the chemical reaction between the ITO and Sb_(2)Se_(3)during the annealing process but it also blocks the electron diffusion from Sb_(2)Se_(3)to ITO *** enhanced performance is mainly attributed to the suppression of the charge recombination at the anode interface.

关键词： Sb_(2)Se_(3) thin-film solar cell passivation

Comparison of intracytoplasmic sperm injection(ICSI)outcomes in infertile men with spermatogenic impairment of differing severity

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Asian Journal of Andrology 2022年第3期24卷 299-304页

作者： Ping Ping Zhong Zheng yi Ma Sha-Sha Zou xiang-Feng chen Center for Reproductive Medicine Ren Ji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200135China Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics Shanghai 200135China Shanghai Human Sperm Bank Shanghai 200135China

The extent of spermatogenic impairment on intracytoplasmic sperm injection(ICSI)outcomes and the risk of major birth defects have been little *** this study,we evaluated the relationship between various spermatogenic conditions,sperm origin on ICSI outcomes,and major birth defects.A total of 934 infertile men attending the Center for Reproductive Medicine of Ren Ji Hospital(Shanghai,China)were classified into six groups:nonobstructive azoospermia(NOA;n=84),extremely severe oligozoospermia(esOZ;n=163),severe oligozoospermia(sOZ,n=174),mild oligozoospermia(mOZ;n=148),obstructive azoospermia(OAZ;n=155),and normozoospermia(NZ;n=210).Rates of fertilization,embryo cleavage,high-quality embryos,implantation,biochemical and clinical pregnancies,abortion,delivery,newborns,as well as major birth malformations,and other newborn outcomes were analyzed and compared among *** NOA group showed a statistically lower fertilization rate(68.2%vs esOZ 77.3%,sOZ 78.0%,mOZ 73.8%,OAZ 76.6%,and NZ 79.3%,all P<0.05),but a significantly higher implantation rate(37.8%)than the groups esOZ(30.1%),sOZ(30.4%),mOZ(32.6%),and OAZ(31.0%)(all P<0.05),which was similar to that of Group NZ(38.4%).However,there were no statistically significant differences in rates of embryo cleavage,high-quality embryos,biochemical and clinical pregnancies,abortions,deliveries,major birth malformations,and other newborn outcomes in the six *** results showed that NOA only negatively affects some embryological outcomes such as fertilization *** was no evidence of differences in other embryological and clinical outcomes with respect to sperm source or spermatogenic *** failure and sperm origins do not impinge on the clinical outcomes in ICSI treatment.

关键词： intracytoplasmic sperm injection nonobstructive azoospermia normozoospermia obstructive azoospermia oligozoospermia

Policy and Management of Carbon Peaking and Carbon Neutrality:A Literature Review

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Engineering 2022年第7期8卷 52-63页

作者： yi-Ming Wei Kaiyuan chen Jia-Ning Kang Weiming chen xiang-Yu Wang Xiaoye Zhang Center for Energy and Environmental Policy Research Beijing Institute of TechnologyBeijing 100081China School of Management and Economics Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Energy Economics and Environmental Management Beijing 100081China State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological SciencesBeijing 100081China

The vision of reaching a carbon peak and achieving carbon neutrality is guiding the low-carbon transition of China’s socioeconomic ***,a research gap remains in the existing literature in terms of studies that systematically identify opportunities to achieve carbon *** address this gap,this study comprehensively collates and investigates 1105 published research studies regarding carbon peaking and carbon *** doing so,the principles of development in this area are quantitively analyzed from a space–time *** the same time,this study traces shifts and alterations in research *** systematic review summarizes the priorities and standpoints of key industries on carbon peaking and carbon ***,with an emphasis on five key management science topics,the scientific concerns and strategic demands for these two carbon emission-reduction goals are *** paper ends with theoretical insights on and practical countermeasures for actions,priority tasks,and policy measures that will enable China to achieve a carbon-neutral *** study provides a complete picture of the research status on carbon peaking and carbon neutrality,as well as the research directions worth investigating in this field,which are crucial to the formulation of carbon peak and carbon neutrality policies.

关键词： Carbon peak Carbon neutrality Systematic review Carbon management