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Static and Dynamic Properties of Soil Food Web Structure in a Greenhouse Environment

土壤圈：英文版 2014年第2期24卷 258-270页

作者： CHEN Yun-Feng CAO Zhi-Ping l.popescu B.H.KIEPPER Institute of Plant Protection and Soil Fertilizer Hubei Academy of Agricultural Sciences College of Resources and Environmental Science China Agricultural University Department of Biological and Agricultural Engineering University of Georgia

Soil food web structure is fundamental to ecosystem process and function; most studies on soil food web structure have focused on agro-ecosystems under different management practices and natural terrestrial ecosystems,but seldom on greenhouses. This study explored the static and temporal variability of soil food structure in two greenhouses of Shandong Province,North China over a two-year period. The static properties were measured directly by surveying functional group composition and a series of parameters portraying the species properties,link properties,chain properties and omnivory properties of the web,as well as indirectly through calculation of nematode indices,enrichment index(EI),structure index(SI),and channel index(CI). The dynamic variability of greenhouse soil food structure was described by the dynamics of functional groups,Bray-Curtis(BC) similarity and cluster analysis. The results showed that the greenhouse soil food web contained 14 functional groups,with microbes having the highest mean biomass,followed by protozoa. Of the three functional groups of protozoa,flagellates were the dominant group on most sampling dates,amoebae only became the dominant group during the summer,while ciliates were the least prevalent group. All nematodes were assigned into one of the four functional groups,bacterivorous,fungivorous,herbivorous and omnivorous,and the fungivorous nematodes had the lowest mean biomass. Mites were assigned into three functional groups and the omnivorous noncryptostigmatic mites were the dominant group. All the functional groups showed significant seasonal changes. The soil food web connectance was 0.15,the maximum food chain length was 5,and the average food chain length was 3.6. The profiles of the EI and SI showed that the food web was resourcedepleted with minimal structure. The results of CI indicated that the bacterial decomposition pathway was the dominant pathway in the food web of the greenhouse soils studied and the results of BC

关键词：温室土壤食物结构静态特性网结构动态特性温室环境农业生态系统陆地生态系统

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Preparation of elastomeric nanocomposites using nanocellulose and recycled alum sludge for flexible dielectric materials

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Journal of Advanced Dielectrics 2023年第1期13卷 57-65页

作者： Dongyang Sun Bernard l.H.Saw Amaka J.Onyianta Bowen Wang Callum Wilson Dominic O’Rourke Chan H.See Carmen-Mihaela popescu Mark Dorris Islam Shyha Zhilun lu School of Engineering and Built Environment Edinburgh Napier UniversityEdinburghUK lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman KajangMalaysia Bristol Composites Institute School of CivilAerospace and Mechanical Engineering University of BristolUniversity WalkBristolBS81TRUK School of Engineering and Materials Science Queen Mary University of LondonLondonUK Petru Poni Institute of Macromolecular Chemistry of the Romanian Academy IasiRomania

Flexible dielectric materials with environmental-friendly,low-cost and high-energy density characteristics are in increasing demand as the world steps into the new Industrial 4.0 *** this work,an elastomeric nanocomposite was developed by incorporating two components:cellulose nanofibrils(CNFs)and recycled alum sludge,as the reinforcement phase and to improve the dielectric properties,in a bio-elastomer *** and alum sludge were produced by processing waste materials that would otherwise be disposed to landfills.A biodegradable elastomer polydimethylsiloxane was used as the matrix and the nanocomposites were processed by casting the materials in Petri *** extraction and heat treatment of alum sludge were conducted and characterized using various techniques including scanning electron microscopy(SEM),thermogravimetric analysis/derivative thermogravimetric(TGA/DTG)and X-ray diffraction(XRD)*** preparing the nanocomposite samples,various amount of alum sludge was added to examine their impact on the mechanical,thermal and electrical *** have shown that it could be a sustainable practice of reusing such wastes in preparing flexible,lightweight and miniature dielectric materials that can be used for energy storage applications.

关键词： Nanocellulose biodegradable sustainable alum sludge nanocomposite flexible dielectric

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Electrochemical Study and Electrodeposition of Copper（I） in Ionic liquid-reline

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Chemical Research in Chinese Universities 2013年第5期29卷 991-997页

作者： popescu Ana-Maria COJOCARU Anca DONATH Cristina CONSTANTIN Virgil laboratory of Molten Salts "Hie Murgulescu" Institute of Physical Chemistry of Romanian Academy Bucharest 060021 Romania Department of Applied Physical Chemistry and Electrochemistry University Politehnica of Bucharest Bucharest 010737 Romania

The authors made the electrochemical studies on the electrode processes during copper electrodeposition with ionic liquids-reline as an electrolytic medium. Reline is a commercial name for a eutectic mixture of choline chloride and urea（1：2, molar ratio）. This new proposed method of copper deposition is an ecological one because the ionic liquids are recyclable, non-volatile and non-toxic. Cyclic voltammetry investigations were conducted at 343 and 353 K in choline chloride-urea（Reline） deep eutectic solvent with single salt CuCl（generally in 0.05--0.38 mol/l concentration range）. Electrochemical impedance spectroscopy investigations were conducted in choline chloride- urea ionic liquid with CuCI（0.05 mol/l）. We investigated both cathodic and anodic processes of Cu＋ ions at different sweep rates in this new electrolytic system based on choline chloride. We have proposed by this an alternative to the classical copper electrodeposition. Coefficient of diffusion, Do, for the system Reline-CuCl is presented and the value of D0 is 1.22× 10^-8 cm2/s.

关键词： Ionic liquid Reline Electrodeposition Cu(I) Coefficient of diffusion

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Optically monitoring and controlling nanoscale topography during semiconductor etching

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light(Science & Applications) 2012年第1期1卷 41-46页

作者： Chris Edwards Amir Arbabi Gabriel.popescu lynford l Goddard Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA

We present epi-diffraction phase microscopy(epi-DPM)as a non-destructive optical method for monitoring semiconductor fabrication processes in real time and with nanometer level *** method uses a compact Mach–Zehnder interferometer to recover quantitative amplitude and phase maps of the field reflected by the *** low temporal noise of 0.6 nm per pixel at 8.93 frames per second enabled us to collect a three-dimensional movie showing the dynamics of wet etching and thereby accurately quantify non-uniformities in the etch rate both across the sample and over *** displaying a gray-scale digital image on the sample with a computer projector,we performed photochemical etching to define arrays of microlenses while simultaneously monitoring their etch profiles with epi-DPM.

关键词： microscopy nanoscale metrology photochemical etching quantitative phase imaging semiconductor process monitoring

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Assessing the performance of YOlOv5 algorithm for detecting volunteer cotton plants in corn fields at three different growth stages

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Artificial Intelligence in Agriculture 2022年第1期6卷 292-303页

作者： Pappu Kumar Yadav J.Alex Thomasson Stephen W.Searcy Robert G.Hardin Ulisses Braga-Neto Sorin C.popescu Daniel E.Martin Roberto Rodriguez Karem Meza Juan Enciso Jorge Solórzano Diaz Tianyi Wang Department of Biological&Agricultural Engineering Texas A&M UniversityCollege StationTXUnited States of America Department of Agricultural&Biological Engineering Mississippi State UniversityMississippi StateMSUnited States of America Department of Electrical&Computer Engineering Texas A&M UniversityCollege StationTXUnited States of America Department of Ecology&Conservation Biology Texas A&M UniversityCollege StationTXUnited States of America Aerial Application Technology Research U.S.D.A.Agriculture Research ServiceCollege StationTXUnited States of America U.S.D.A.-APHIS PPQ S&T Mission LabEdinburgTXUnited States of America Department of Civil&Environmental Engineering Utah State UniversityLoganUTUnited States of America Texas A&M Agrilife Research&Extension Center WeslacoTXUnited States of America College of Engineering China Agricultural UniversityBeijingChina

The feral or volunteer cotton(VC)plants when reach the pinhead squaring phase(5–6 leaf stage)can act as hosts for the boll weevil(Anthonomus grandis l.)*** Texas Boll Weevil Eradication Program(TBWEP)employs people to locate and eliminate VC plants growing by the side of roads or fields with rotation crops but the ones growing in the middle of fields remain *** this paper,we demonstrate the application of computer vision(CV)algorithm based on You Only look Once version 5(YOlOv5)for detecting VC plants growing in the middle of corn fields at three different growth stages(V3,V6 and VT)using unmanned aircraft systems(UAS)remote sensing *** the four variants of YOlOv5(s,m,l,and x)were used and their performances were compared based on classification accuracy,mean average precision(mAP)and *** was found that YOlOv5s could detect VC plants with maximum classification accuracy of 98%and mAP of 96.3%at V6 stage of corn while YOlOv5s and YOlOv5m resulted in the lowest classification accuracy of 85%and YOlOv5m and YOlOv5l had the least mAP of 86.5%at VT stage on images of size 416×416 *** developed CV algorithm has the potential to effectively detect and locate VC plants growing in the middle of corn fields as well as expedite the management aspects of TBWEP.

关键词： Boll weevil Volunteer cotton plant Computer vision YOlOv5 Unmanned aircraft systems(UAS) Remote sensing

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Synthesis and performance of Zn–Ni–P thin films

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Chinese Physics B 2015年第3期24卷 259-268页

作者： V.Soare M.Burada I.Constantin M.Ghita V.Constantin F.Miculescu A.M.popescu New Materials and Technologies laboratory National Research and Development Institute for Nonferrous and Rare Metals-IMNR Institute of Physical Chemistry "Ilie Murgulescu" Laboratory of Molten Salts University Polytehnica of Bucharest Center of Biomaterials (BIOMAT)

The electroplating of Zn–Ni–P thin film alloys from a sulfate bath containing phosphoric and phosphorous acid was investigated. The bath composition and the deposition parameters were optimized through Hull cell experiments, and the optimum experimental conditions were determined（p H = 2, temperature = 298–313 K, zinc sulfate concentration =30 g·l^-1, EDTA concentration = 15 g·l^-1, and current density = 1.0–2.0 A·dm^-2）. The SEM analysis of the coating deposited from the optimum bath revealed fine-grained deposits of the alloy in the presence of EDTA. Optical microscopy analysis indicated an electrodeposited thin film with uniform thickness and good adhesion to the steel substrate. The good adherence of the coatings was also demonstrated by the scratch tests that were performed, with a maximum determined value of 25 N for the critical load. Corrosion resistance tests revealed good protection of the steel substrate by the obtained Zn–Ni–P coatings, with values up to 85.89% for samples with Ni contents higher than 76%. The surface analysis of the thin film samples before and after corrosion was performed by X-ray photoelectron spectroscopy（XPS）.

关键词： thin film corrosion electrochemistry surface

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二氧化钛气凝胶基质中金纳米粒子的光催化活性和结构(英文)

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催化学报 2013年第4期34卷 734-740页

作者： Zsolt PAP Andreea RADU Izabella Jolan HIDI Georgian MElINTE lucian DIAMANDESCU Traian popescu lucian BAIA Virginia DANCIU Monica BAIA Faculty of Chemistry and Chemical Engineering Babes‐Bolyai University 11 Arany Janos str. 400028 Cluj-Napoca Romanla Faculty of Physics Babes‐Bolyai University 1 MihaiL Kogalniceanu str. 400084 Cluj-Napoca Romania National Institute of Materials Physics P.O.Box MG-777125 Bucharest-Magurele Romania Institute for Interdisciplinary Research in Bio‐Nano‐Sciences Babes‐Bolyai University 42 Treboniu Laurian str 400271 Cluj-Napoca Romania

TiO2 -Au aerogels containing different amounts of gold nanoparticles of different sizes (5 and 16 nm) were successfully synthesized using a sol-gel procedure, and were tested for salicylic acid photodegradation under UV irradiation. The structure and morphology of the obtained materials were investigated using X-ray diffraction, transmission electron microscopy, and N2 adsorption-desorption measurements. UV-Vis spectroscopy was used to study the optical properties. The effects of the gold nanoparticles on the TiO2 crystallization process were twofold, as follows: (i) the number of crystallized zones was strongly related to the concentration of the gold nanoparticles, and (ii) the smaller gold particles increased the time taken for the crystallization of the samples. It was found that the noble metal-doped samples exhibited higher degradation rates compared with bare titania. It was found that the most active photocatalyst in each studied system was the sample with the highest concentration of gold nanoparticles. Additionally, the highest degradation rate value was obtained with the smallest Au nanoparticles (46.4 10-3 μmol/(l·s).

关键词： Nanomaterial Sol‐gel Titania Salicylic acid Photocatalytic performance

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Detailed characterization of a laboratory magnetized supercritical collisionless shock and of the associated proton energization

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Matter and Radiation at Extremes 2022年第1期7卷 15-28页

作者： W.Yao A.Fazzini S.N.Chen K.Burdonov P.Antici J.B´eard S.Bolaños A.Ciardi R.Diab E.D.Filippov S.Kisyov V.lelasseux M.Miceli Q.Moreno V.Nastasa S.Orlando S.Pikuz D.C.popescu G.Revet X.Ribeyre E.d’Humi`eres J.Fuchs lUlI–CNRS CEAUPMC Univ Paris 06:Sorbonne Universit´eEcole PolytechniqueInstitut Polytechnique de ParisF-91128 Palaiseau CedexFrance Sorbonne Universit´e Observatoire de ParisUniversit´e PSLCNRSLERMAF-75005 ParisFrance ElI-NP “Horia Hulubei”National Institute for Physics and Nuclear Engineering30 Reactorului StreetRO-077125 Bucharest-MagureleRomania IAP Russian Academy of Sciences603155 Nizhny NovgorodRussia INRS-EMT 1650 Blvd.Lionel-BouletVarennesQuebec J3X 1S2Canada lNCMI UPR 3228CNRS-UGA-UPS-INSAF-31400 ToulouseFrance JIHT Russian Academy of Sciences125412 MoscowRussia Universit`a degli Studi di Palermo Dipartimento di Fisica e Chimica E.Segr`ePiazza del Parlamento 190134 PalermoItaly INAF–Osservatorio Astronomico di Palermo PalermoItaly University of Bordeaux Centre Lasers Intenses et ApplicationsCNRSCEAUMR 5107F-33405 TalenceFrance ElI-Beamlines Institute of PhysicsCzech Academy of Sciences5 Kvetna 83525241 Dolni BrezanyCzech Republic NRNU MEPhI 115409 MoscowRussia

Collisionless shocks are ubiquitous in the Universe and are held responsible for the production of nonthermal particles and high-energy *** the absence of particle collisions in the system,theory shows that the interaction of an expanding plasma with a pre-existing electromagnetic structure(as in our case)is able to induce energy dissipation and allow shock *** formation can alternatively take place when two plasmas interact,through microscopic instabilities inducing electromagnetic fields that are able in turn to mediate energy dissipation and shock *** our platform in which we couple a rapidly expanding plasma induced by high-power lasers(JlF/Titan at llNl and lUlI2000)with high-strength magnetic fields,we have investigated the generation of a magnetized collisionless shock and the associated particle *** have characterized the shock as being collisionless and *** report here on measurements of the plasma density and temperature,the electromagnetic field structures,and the particle energization in the experiments,under various conditions of ambient plasma and magnetic *** have also modeled the formation of the shocks using macroscopic hydrodynamic simulations and the associated particle acceleration using kinetic particle-in-cell *** a companion paper to Yao et al.[***.17,1177–1182(2021)],here we show additional results of the experiments and simulations,providing more information to allow their reproduction and to demonstrate the robustness of our interpretation of the proton energization mechanism as being shock surfing acceleration.

关键词： field collision shock

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Antimicrobial Effects of Berries on listeria monocytogenes

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Food and Nutrition Sciences 2020年第9期11卷 873-886页

作者： Elisaveta Sandulachi Daniela Cojocari Greta Balan liliana popescu Aliona Ghendov-Moșanu Rodica Sturza Technical University of Moldova Chisinau Republic of Moldova (RM) "Nicolae Testemitanu" State University of Medicine and Pharmacies Chisinau Republic of Moldova (RM)

The purpose of this study was to first evaluate the antimicrobial effects of powder and extracts of berries (rose-hip, aronia, sea buckthorn and hawthorn) on the development of antibiotic-resistant L. monocitogenes. Listeria monocytogenes is considered one of the most important pathogens responsible for food-borne infection. Antimicrobial properties were evaluated using the standard Kirby-Bauer disk diffusion method. Bacterial inactivation networks were determined and compared, as well as the possibility of using powders and extracts of berries to control the risk of Listeria monocytogees infestation in the milk and dairy industry as well as in the meat industry. The effect of pH (4.78 - 4.43) and water activity (0.90 - 0.80) on the relationship between optical density (OD) at 600 nm and the plate count (CFU ml-1) was investigated for Listeria monocytogenes. It was determined Minimum Inhibitory Concentration (MIC), Minimum Bactericidal Concentration (MBC) of berries for L. monocytogenes. The most relevant bacteriostatic and bactericidal le="font-family

关键词： l. monocitogenes Berries Kirby-Bauer Test Minimum Inhibitory Concentration (MIC) Minimum Bactericidal Concentration (MBC)

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高度多孔纳米结构纤维素纤维的溶液纺丝工艺

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国际纺织导报 2009年第8期37卷 38-40,42页

作者： C．Hacker T．Gries C．popescu l．Ratke 骆为林（译）行兰（校）德国亚琛纺织技术研究所德国羊毛研究所德国宇航研究院不详

由纤维素生产纤维的常规生产方法,迄今已生产了具有致密微结构和极大长径比的材料。在此介绍的表面多孔的纤维是一种新型纤维状材料,为科学家和工程师提供了许多挑战和机会。由于纳米结构纤维的特性,它在工业产品,例如从过滤到类似药物... 详细信息

由纤维素生产纤维的常规生产方法,迄今已生产了具有致密微结构和极大长径比的材料。在此介绍的表面多孔的纤维是一种新型纤维状材料,为科学家和工程师提供了许多挑战和机会。由于纳米结构纤维的特性,它在工业产品,例如从过滤到类似药物释放载体的特殊产品的许多用途中具有很大潜力。通过采用溶胶凝胶方法,首次制成了表面多孔的纳米结构纤维素纤维。

关键词：纳米结构纤维素纤维溶液纺丝溶胶凝胶

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