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Characterization of different plasma-treated cobalt oxide catalysts for oxygen reduction reaction in alkaline media

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Science Bulletin 2016年第8期61卷 612-618页

作者： Lisa M.Uhlig Gustav Sievers volker Brüser Alexander Dyck Gunther Wittstock NEXT ENERGY EWE-Research Centre for Energy Technology26129 OldenburgGermany Faculty of Mathematics and Science CIS-Center of Interface ScienceInstitute of ChemistryCarl von Ossietzky University of Oldenburg26111 OldenburgGermany Leibniz Institute for Plasma Science and Technology 17489 GreifswaldGermany

Plasma-synthesized cobalt oxide supported on carbon has been analyzed for its use for electrocatalytic oxygen reduction reaction （ORR） in alkaline anion exchange membrane fuel cells （AEMFC）. This work presents the ORR activity in 0.1 mol L-1 KOH and 0.1 tool L-1 K2CO3 at 25 ℃. Cyclic voltammetry （CV） was used to determine the potentials at which the ORR occurs and to evaluate the stability of catalyst. Moreover, a rotating ring-disk electrode （RRDE） was used to investigate the activity of the catalysts and the formation of the by-product hydroperoxide anion （HO2-） as well as to identify the preferred pathway of the ORR. Calculated kinetic parameters for the ORR for the cobalt catalysts are shown in this work together with a comparison to a commercial platinum catalyst. However, the cobalt oxide produced more by-products which could lead to damage of the membrane in a fuel cell through a radical attack of the polymer backbone.

关键词： Oxygen reduction reaction Alkalinemedia - Electrocatalytic activity RRDE Cobaltcatalyst Alkaline fuel cell

A Deleted Deletion Site in a New Vector Strain and Exceptional Genomic Stability of Plaque-Purified Modified Vaccinia Ankara(MVA)

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Virologica Sinica 2020年第2期35卷 212-226页

作者： Ingo Jordan Deborah Horn Kristin Thiele Lars Haag Katharina Fiddeke volker Sandig ProBioGen AG.Herbert-Bayer-StraBe 8 13086 BerlinGermany Sartorius Stedim Cellca GmbH.Erwin-Rentschler-Str 21 88471 LaupheimGermany Vironova AB Giivlegatan 2211330 StockholmSweden Department of Laboratory Medicine Karolinska Universitetsjukhuset i Huddinge14152 HuddingeSweden

Vectored vaccines based on highly attenuated modified vaccinia Ankara(MVA) are reported to be immunogenic, tolerant to pre-existing immunity, and able to accommodate and stably maintain very large transgenes. MVA is usually produced on primary chicken embryo fibroblasts, but production processes based on continuous cell lines emerge as increasingly robust and cost-effective alternatives. An isolate of a hitherto undescribed genotype was recovered by passage of a nonplaque-purified preparation of MVA in a continuous anatine suspension cell line(***) in chemically defined *** novel isolate(MVA-CR19) replicated to higher infectious titers in the extracellular volume of suspension cultures and induced fewer syncytia in adherent cultures. We now extend previous studies with the investigation of the point mutations in structural genes of MVA-CR19 and describe an additional point mutation in a regulatory gene. We furthermore map and discuss an extensive rearrangement of the left telomer of MVA-CR19 that appears to have occurred by duplication of the right telomer. This event caused deletions and duplications of genes that may modulate immunologic properties of MVACR19 as a vaccine vector. Our characterizations also highlight the exceptional genetic stability of plaque-purified MVA:although the phenotype of MVA-CR19 appears to be advantageous for replication, we found that all genetic markers that differentiate wildtype and MVA-CR19 are stably maintained in passages of recombinant viruses based on either wildtype or MVA-CR.

关键词： Modified vaccinia Ankara(MVA) MVA-CR19 CR.pIX Suspension cell line Vaccine production Genome stability

Molecular Understanding of Charge Storage in MoS_(2)Supercapacitors with Ionic Liquids

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能源与环境材料（英文） 2021年第4期4卷 631-637页

作者： Zhun Liang Chang Zhao Wei Zhao Yuan Zhang Pattarachai Srimuk volker Presser Guang Feng State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan Hubei 430074China Nano Interface Center for Energy School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan Hubei 430074China Department of Chemical and Biomolecular Engineering Vanderbilt University2201 West End AvenueNashville TN 37235USA INM-Leibniz Institute for New Materials Campus D22Saarbrucken 66123Germany Saarland University Campus D22Saarbrucken 66123Germany

Owing to high electrical conductivity and ability to reversibly host a variety of inserted ions,2D metallic molybdenum disulfide(1 T-MoS_(2))has demonstrated promising energy storage performance when used as a supercapacitor ***,its charge storage mechanism is still not fully understood,in particular,how the interlayer spacing of 1 T-MoS_(2)would affect its capacitive *** this work,molecular dynamics simulations of 1 T-MoS_(2)with interlayer spacing ranging from 0.615 to 1.615 nm have been performed to investigate the resulting charge storage capacity in ionic *** reveal a camel-like capacitance-potential relation,and MoS_(2)with an interlayer spacing of 1.115 nm has the highest volumetric and gravimetric capacitance of118 F cm^(-3)and 42 F g^(-1),*** ions in MoS_(2)with an interlayer spacing of 1.115 nm diffuse much faster than with interlayer spacings of 1.365 and 1.615 nm,the MoS_(2)with larger interlayer spacing has a much faster-charging *** analyses reveal that the ion number density and its charging speed,as well as ion motion paths,have significant impacts on the charging *** work helps to understand how the interlayer spacing affects the interlayer ion structures and the capacitive performance of MoS_(2),which is important for revealing the charge storage mechanism and designing MoS_(2)supercapacitor.

关键词： charge storage mechanism ionic liquids molecular dynamics simulation molybdenum disulfide supercapacitors

Prevalence of cholelithiasis in patients with chronic inflammatory bowel disease

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World Journal of Gastroenterology 2005年第39期11卷 6170-6175页

作者： Wolfgang Kratzer Mark M Haenle Richard A Mason Christian von Tirpitz volker Kaechele Department of Internal Medicine I University Hospital Ulm Robert-Koch-Str.8D-89081 UlmGermany

AIM： To investigate the effect of chronic inflammatory bowel disease （CIBD） specific risk factors for cholecystolithiasis, as duration and involvement pattern of the disease and prior surgery in patients with Crohn＇s disease （CD） and ulcerative colitis （UC）. METHODS： A total of 222 patients with CD （135 females, 87 males, average age, 35.8±11.8 years; range 17-81 years） and 88 patients with UC （39 females, 49 males; average age, 37.2±13.6 years; range 16-81 years） underwent clinical and ultrasound examinations. Besides age, sex and degree of obesity, patients＇ CIBD specific parameters, including duration and extent of disease and prior operations were documented and evaluated statistically using logistic regression. RESLTLTS： The overall prevalence of gallbladder stone disease in patients with CD was 13% （n = 30）. Only age could be shown to be an independent risk factor （P = 0.014）. Compared to a collective representative for the general population in the same geographic region, the prevalence of cholecystolithiasis was higher in all corresponding age groups. Patients with UC showed an overall prevalence of gallbladder stone disease of only 4.6%. CONCLUSION：Only age but not disease-specific factors such as duration and extent of disease, and prior surgery are independent risk factors for the development of cholecystolithiasis in patients with CIBD.

关键词： Crohn's disease Ulcerative colitis Gallstone disease Ultrasonography Ultrasound

Insights into the radial water jet drilling technology-Application in a quarry

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第2期10卷 236-248页

作者： Thomas Reinsch Bob Paap Simon Hahn volker Wittig Sidney van den Berg GFZ German Research Centre for Geosciences Telegrafenberg14473 PotsdamGermany TNO Sustainable Geo EnergyUtrechtThe Netherlands International Geothermal Centre-GZB Lennershofstr.14044801 BochumGermany Well Services Group Phileas Foggstraat 65NL-7825 AL EmmenThe Netherlands

In this context, we applied the radial water jet drilling(RJD) technology to drill five horizontal holes into a quarry wall of the Gildehaus quarry close to Bad Bntheim, Germany. For testing the state-of-the-art jetting technology, a jetting experiment was performed to investigate the influence of geological heterogeneity on the jetting performance and the hole geometry, the influence of nozzle geometry and jetting pressure on the rate of penetration, and the possibility of localising the jetting nozzle utilizing acoustic activity. It is observed that the jetted holes can intersect fractures under varying angles, and the jetted holes do not follow a straight path when jetting at ambient surface condition. Cuttings from the jetting process retrieved from the holes can be used to estimate the reservoir rock permeability. Within the quarry, we did not observe a change in the rate of penetration due to jetting pressure *** monitoring was partially successful in estimating the nozzle location. Although the experiments were performed at ambient surface conditions, the results can give recommendations for a downhole application in deep wells.

关键词： Acoustic monitoring Drilling performance Trajectory Permeability Rock properties Radial water jet drilling(RJD)

Survey of Rice Cropping Systems in Kampong Chhnang Province,Cambodia

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Rice science 2013年第2期20卷 154-164页

作者： volker KLEINHENZ Sophon CHEA Ngin HUN Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH #17Street 306P.O.Box 81Phnom PenhCambodia Provincial Department of Agriculture (PDA) Kampong Chhnang Sangkat KsamKampong ChhnangCambodia Present address:The Herbals Joint Stock Company 8 th FloorBAC A BuildingNo.9Dao Duy Anh StreetDong Da DistrictHanoiVietnam

Although Cambodia might have achieved self-sufficiency and an exported surplus in rice production,its rice-based farming systems are widely associated with low productivity,low farmer income and rural *** study is based on a questionnaire village survey in 14 communes containing 97 villages of Kampong Chhnang Province from March to June,*** analyzes the prevailing rice-based cropping systems and evaluates options for their *** in cropping systems depend on the distance from the Tonle Sap water *** distances greater than 10 km,transplanted wet-season rice cropping system with low productivity of about 1.6 t/hm 2 *** deficiency can be primarily attributed to soils with high coarse sand fractions and low pH （〈 4.0）,use of ＇late＇ cultivars,and exclusive use of self-propagated *** improve this cropping system,commercial ＇medium＇ cultivars help prevent crop failure by shortening the cultivation period by one month and complementation of wet-season rice with non-rice crops should be *** adjacent （≤ 1 km） to the water bodies become inundated for up to seven months between July until January of each *** this area,soils contain more fine sand,silt and clay,and their pH is higher （〉 4.0）.Farmers predominantly cultivate dry-season recession rice between January and ***-nine percent of the area is sown directly and harvested by *** ratio of commercial rice seeds is 59% and yields average 3.2 t/hm *** of the second dry-season rice between April and July may double annual yields in this rice cropping *** upgrading other cultivation technologies,using seeds from commercial sources will improve yield and rice *** with rice,farmers grow non-rice crops at different intensities ranging from single annual crops to intensive sequences at low yields.

关键词： rice cropping system socioeconomic indicator on-farm activity rice production

Mixers with Microstructured Foils for Chemical Production Purposes

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化工进展 2005年第5期24卷 570-576页

作者： Bernd Werner volker Hessel Patrick Lb Institut für Mikrotechnik Mainz GmbH Carl-Zeiss-Straβe 18-20D-55129 Institut für Mikrotechnik Mainz GmbHCarl-Zeiss-Straβe 18-20D-55129 MainzGermanyInstitut für Mikrotechnik Mainz GmbHCarl-Zeiss-Straβe 18-20D-55129 MainzGermany

约翰威立出版公司是世界知名的出版集团,出版、发行许多著名学术、技术期刊和书籍。《化工进展》编辑部从2005年第5期起,与新加坡约翰威立股份有限公司合作,不定期刊登其出版、发行的知名化工期刊的原版文章。欢迎读者提出宝贵意见。

关键词：化工行业 IMM 科研实力微观结构混频器

幽门螺杆菌下调人胃黏膜分泌性白细胞蛋白酶抑制因子的表达

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中华微生物学和免疫学杂志 2005年第10期25卷 842-846页

作者：叶嗣颖 Thomas Wex Gerhard Treiber Michael vieth Peter Malfertheiner 华中科技大学同济医学院基础医学院病原生物系武汉430030 德国马格德堡大学医学院胃肠病学肝病学和传染学病系德国马格德堡大学医学院病理学研究所

目的通过低剂量阿斯匹林的处理作为炎性模型,研究分析人胃和十二指肠黏膜分泌性白细胞蛋白酶抑制因子(SLPI)表达下调是否与幽门螺杆菌(Helicobacter prlori,Hp)定居或感染有关.方法选择20例健康志愿者分成Hp+和Hp-组,其中Hp+组成功进行... 详细信息

目的通过低剂量阿斯匹林的处理作为炎性模型,研究分析人胃和十二指肠黏膜分泌性白细胞蛋白酶抑制因子(SLPI)表达下调是否与幽门螺杆菌(Helicobacter prlori,Hp)定居或感染有关.方法选择20例健康志愿者分成Hp+和Hp-组,其中Hp+组成功进行了根除治疗.每组10人,每人口服阿司匹林100 mg/d.通过活检提取受试者不同部位胃黏膜的总RNA和蛋白,采用RT/realtime PCR检测SLPI的mRNA表达水平和单抗ELISA定量测定SLPI蛋白,统计分析SLPI基因表达的相关数据.结果与Hp-组比较,Hp+组胃窦黏膜SLPI表达水平显著降低,但Hp+组经抗生素根除治疗后其SLPI水平恢复至与Hp-组相当的水平.在低剂量阿司匹林处理下,所有受试者表现组织学观察到的活动性或慢性炎性征.各组在药物处理的不同时间虽有一定的差异,但与药物处理对照组(第0天)比较,SLPI的表达差异没有统计学意义[第1天:(77±880)pg/10?g蛋白;第3天:(941±149)pg/10?g蛋白;第7天:(763±363)pg/10?g蛋白].阿司匹林处理的1周内以胃窦为主的胃炎持续存在(活动性:1.5～1.7;慢性:1.2～2.1),但与Hp-和Hpe(根除组)比较,Hp+组的胃窦黏膜SLPI蛋白表达仍显著降低.结论低剂量阿司匹林处理所致炎性反应对人胃黏膜SLPI的表达没有影响,胃窦黏膜SLPI基因表达的下调与Hp感染有关.

关键词：分泌性白细胞蛋白酶抑制因子幽门螺杆菌阿司匹林表达

MeV Properties of the γ-ray Blazars PKS1622-297, 3C454.3 and CTA102

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天文研究与技术 2003年第S1期 126-130页

作者： Werner Collmar volker Schnfelder Max Planck Institut für extraterrestrische Physik Giessenbachstr. D 85748 Garching GermanyMax Planck Institut für extraterrestrische Physik Giessenbachstr. D 85748 Garching Germany

The MeV properties of the blazars PKS 1622-297, 3C 454.3 and CTA 102 have been analyzed using COMPTEL data (0.75-30 MeV). Our results show significant detections of PKS 1622-297 (5.9σ) in the 10-30 MeV band during its γ ray flare in 1995, and of 3C 454.3(5.6σ) in the sum of 8 years observations in the 3-10 MeV band. By comparing the MeV results to the ones obtained in neighboring bands by the Compton Gamma Ray Observatory (CGRO) experiments EGRET and OSSE, we reveal some properties of these 3 blazars at γ ray energies.

关键词： PKS MeV Properties of the and CTA102