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21^(st) Century Niobium-Bearing structural steels

Journal of Iron and steel Research International 2011年第S1期18卷 803-807页

作者： Jansto steven CBMM-Reference Metals Company 1000 Old Pond Road Bridgeville PA USA

Value-added applications of niobium (Nb) microalloyed steels continue to be developed for commercial implementation to meet increased material demands and improved properties for 21st century structural applications. These applications demand Nb-bearing steels that deliver improved toughness, fracture and fire resistance and weldability. Such applications include medium and jumbo beam, boiler, bridge, container, heavy equipment, long product, pressure vessel, ship, storage tank.and windtower applications. steel producers are challenged to develop microalloyed steel grades that cost effectively meet end user demands for higher strength at thinner cross sections, better low temperature toughness to resist brittle fracture in building, pressure vessel and ship structures, sustain higher loads per unit area in earthquak. and hurricane zone product applications, demonstrate improved fire-resistance in buildings, bridges and tunnels and provide overall improved weldability. Niobium is often a k.y element to achieve these results. This paper will discuss Nb mark.t opportunities and k.y operational practices required to successfully melt, cast and roll these high strength steel grades. Niobium process metallurgy is important to leverage the ability of niobium to obtain ultra-fine grain, homogeneous structural steel microstructures with superior mechanical properties. The process metallurgy, physical metallurgy and resultant properties are significantly determined by mill capabilities, mill practices, operational understanding and the culture of the steel mill. The optimal combination and implementation aspects that are unique to each mill we call metallurgical operational integration (MOI) . MOI is the bridge that link. the product requirements to mill capability and process implementation.

关键词： Century Niobium-Bearing structural steels st

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Investigation of environmental and land use impacts in forested permafrost headwaters of the Selenga-Baik.l river system,Mongolia-Effects on discharge,water quality and macroinvertebrate diversity

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International Soil and Water Conservation Research 2021年第4期9卷 605-619页

作者： martin Pfeiffer Georg k.stner Erdenetsetseg Erdenesuk. Wolf von Tümpling Jürgen Hofmann Department of Biogeography University of BayreuthUniversitätsstraße 3095447 BayreuthGermany Department of Aquatic Ecosystem Analysis and Management(ASAM) Helmholtz Centre for Environmental Research-UFZBrückstraße 3a39114 MagdeburgGermany Department of Ecology National University of MongoliaBaga toiruu 47Ulaanbaatar 210646Mongolia Department of Animal Ecology and Tropical Biology BiocenterJulius-Maximilians-Universität WürzburgAm Hubland97074 WürzburgGermany National Dong Hwa University No.1Sec.2Da Hsueh Rd.ShoufengHualien 97401Taiwan Central Laboratory for Water Analytics&Chemometrics Helmholtz Centre for Environmental Research-UFZBrückstrasse 3a39114 MagdeburgGermany Büro für Integrierten Gewässerschutz-BiG Werner-Voß-Damm 54 b12101 BerlinGermany

Headwater streams play a major role for provision of ecosystem services,*** *** investigated a high-altitude headwater catchment of the k.araa River(including 411st-order rivers)to understand the impact of land cover(especially forest cover),environment and human usage on runoff,chemical water quality and macroinvertebrate fauna in a river basin under discontinuous permafrost conditions in an arid,sparsely populated region of *** verify our hypotheses that different landuses and environmental impacts in permafrost headwaters influence water quality,we investigated 105 sampling sites,37 of them at intermittent stream sections without water *** was positively impacted by land cover types steppe,grassland and forest and negatively by shrubland,forest burnt by wild fires(indicating a reduction of permafrost)and *** quality was affected by altitude,longitude and latitude,shrub growth and water *** diversity of macroinvertebrates was driven by water temperature,iron content of the water,flow velocity,and subbasin size(adjusted R^(2)=0.54).Sample plots clustered in three groups that differed in water chemistry,macroinvertebrate diversity,species composition and *** study confirms that steppes and grasslands have a higher contribution to runoff than forests,forest cover has a positive impact on water quality,and diversity of macroinvertebrates is higher in sites with less nutrients and *** excellent ecological status of the upper reaches of the k.araa is severely threatened by forest fires and human-induced climate change and urgently needs to be conserved.

关键词： Ecosystem services Ephemeroptera-Plecoptera-Trichoptera (EPT)complex GIS-based analysis IWRM-MoMo project Land use land cover(LULC) Natural reference state Runoff Self-purification capacity stream water chemistry

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Update of g-2 of the muon and △α

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Chinese Physics C 2010年第6期34卷 728-734页

作者： T.Teubner k.Hagiwara R.Liao A.D.martin Daisuk. Nomura Department of Mathematical Sciences University of Liverpool Theory Center KEK Department of Physics and Institute for Particle Physics Phenomenology University of Durham

We update our standard Model predictions for g-2 of the muon and for the hadronic contributions （5） 2 to the running of the QED coupling, Δαbad^5）（MZ^2）. Particular emphasis is put on recent changes in the had... 详细信息

关键词： Anomalous magnetic moment muon running coupling hadronic contributions

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A meta-analysis of 1-year outcomes of transcatheter versus surgical aortic valve replacement in low-risk.patients with severe aortic stenosis

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Journal of Geriatric Cardiology 2020年第1期17卷 43-50,I0008-I0010页

作者： Aaqib H Malik.Syed Zaid Hasan Ahmad Joshua Goldberg Tanya Dutta Cenap Undemir martin Cohen Wilbert S Aronow steven L Lansman Department of Medicine Westchester Medical Center and New York Medical CollegeValhallaNYUSA Department of Cardiology Westchester Medical Center and New York Medical CollegeValhallaNYUSA Section of Cardiothoracic Surgery Department of SurgeryWestchester Medical CenterValhallaNew YorkUSA

Back.round Transcatheter aortic valve replacement(TAVR)for the treatment symptomatic severe aortic stenosis(AS)is indicated in patients with intermediate or higher surgical *** trials showed TAVR,and surgical aortic valve replacement(SAVR)perform similarly at 1-year for the composite outcomes of mortality,strok. and *** performed a comprehensive meta-analysis to compare individual outcomes at 1-year for TAVR compared to SAVR in low-risk.*** Pub Med,Embase,and Cochrane central were searched for all the randomized controlled trials(RCTs)that reported 1-year comparative outcomes of TAVR and surgical aortic valve replacement(SAVR).Our conclusions are based upon the random-effects model using Der Simonian-Laird *** Data from 4 trials and 2887 randomized patients showed that TAVR had lower rates of all-cause mortality,cardiovascular mortality,and atrial fibrillation compared to SAVR at 1-year follow-up(Pk.of permanent pacemak.r implantation and moderate-severe paravalvular leak.Pst randomised trial data demonstrates that in short-term,TAVR is safe and effective in reducing all-cause mortality or *** follow-up of RCTs is needed to determine the durability of clinical benefits in TAVR over SAVR in low-risk.patients.

关键词： Aortic stenosis Low surgical risk Meta-analysis Transcatheter aortic valve replacement

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Myxomycete diversity in the Tarim basin and eastern Tian-Shan,Xinjiang Prov.,China

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Fungal Diversity 2013年第2期59卷 91-108页

作者： martin Schnittler Yuri k.Novozhilov Eva Carvajal Frederick.W.Spiegel Institute of Botany and Landscape Ecology Ernst Moritz Arndt University GreifswaldGrimmer Str.8817487 GreifswaldGermany V.L.k.marov Botanical Institute of the Russian Academy of Sciences Prof.Popov St.2197376 St.PetersburgRussia Royal Botanic Garden(CSIC) Plaza de Murillo2Madrid 28014Spain Department of Biological Sciences University of ArkansasSCEN 6011FayettevilleAR 72701USA

We report the results of a survey for myxomycetes in the Chinese province of Xinjiang,covering the northern part of the Tarim basin and the eastern Tian-Shan *** in the hyperarid Tarim basin focused on monospecific Tugai forests;these are park.lik. stands of the phreatophyte Populus *** a transect from the Tarim basin to the mountains,trees vanish outside the basin,but reoccur at ca.1,400 m elevation as monospecific forests of Picea schrenk.ana;the second focal area of the *** a total of 362 substrate samples(245 from the Tarim basin,177 from the mountains)we obtained 477 determinable records of myxomycetes,plus a total of 206 field collections,the latter almost exclusively from the spruce forests in the *** the 80 taxa recorded 53 are represented by field collections,and 32 were found in moist chamber cultures;with a very low overlap in species assemblages found in the field and in *** receiving less than 50 mm annual precipitation,corticolous myxomycetes were common in the Tugai forests,with Physarum pseudonotabile ***.,Didymium anellus,Echinostelium colliculosum and Protophysarum phloiogenum as the most common *** to the Tarim basin(21 taxa)the mountains were much richer in myxomycetes(75 taxa),although the diversity recovered from cultures was comparable(21 vs.28 taxa).Most species from the mountains fruited on decaying spruce,often collected under or even inside the logs due to the extremely dry *** results suggest first that there is no lower limit of annual precipitation for myxomycetes,as long as at least some days with nightly dew fall allow these organisms to complete their life ***,the two examples of surprisingly diverse myxomycete assemblages from monospecific forests demonstrate,that species richness of this group is not necessarily connected with plant diversity of the *** survey is the most eastern of a large-scale study of myxomycete diversity throughout M

关键词： Amoebozoa Distribution Moist chamber culture Myxogastria Plasmodial slime molds

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Management and Outcome of Urethral strictures at Two Tertiary Health Facilities in Cameroon

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Open Journal of Urology 2024年第8期14卷 435-446页

作者： martin Divine Mok.k. Divine Enoru Eyongeta Ek.ni Mahamat Ek.ni Diana Nunga Theophile Chunteng Nana Ntungwetape Ngwane Mwambo Nalova Elroy Patrick.Weledji Chichom Alain Mefire Marcellin Ngowe Ngowe Department of Surgery and Specialties Faculty of Health Sciences University of Buea Buea Cameroon Department of Surgery Regional Hospital Buea Buea Cameroon Department of Surgery Regional Hospital Limbe Limbe Cameroon Department of Surgery Douala General Hospital Douala Cameroon

Introduction and Objectives: Urethral stricture is a reduction in the caliber of the urethral lumen impeding the outflow of urine. It predominantly affects males. The disease burden is severe in our milieu where access to specialized care is limited. Our goal was therefore to assess the management and outcome of male urethral stricture at two tertiary hospitals in Douala, Cameroon. Materials and Methods: This was a hospital-based retrospective study of patients managed for urethral stricture over 5 years (January 1st, 2017 to December 31st, 2021) at the Douala General and Laquintinie Hospitals. Data on sociodemographic, clinical, paraclinical, and treatment options were extracted using pre-structured forms. Data was analyzed using statistical Pack.ge for Social Sciences (SPSS) version 28. statistical significance was set at p-value Results: We exploited 130 medical records. The mean age of patients was 46.5 years. Dysuria and weak.urine stream were the major presenting complaints (63.8% and 23.8% respectively). The etiology of urethral stricture was iatrogenic in 42.3% of cases. The strictures were mostly single (89.8%), and the bulbar urethra was most affected (46.9%). 28 patients had urinary tract infections and the most frequently isolated germ was E. coli in 29.6%. Direct visual internal urethrotomy (DVIU) was performed in 42.3% of cases. Surgery, especially excision and primary anastomosis (EPA) was done in 28.5% of cases. Major complications were wound infection, acute k.dney injury (Ak.), and urethrocutaneous fistulae affecting 3.1, 2.3, and 1.5% of cases respectively. The recurrence rate was 17% with a mortality rate of 0.08%. Conclusion: Urethral stricture is common in our adult male population. The cause is mainly iatrogenic and the bulbar urethra is most affected. Minimally invasive and open reconstruction are frequently used treatment options with significant recurrence rates in the long term.

关键词： Urethral stricture Management Outcomes

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大豆品种杂交回交后代生育时期结构的遗传改良

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大豆科学 2010年第3期29卷 374-379页

作者：谢甫绨王闯张惠君敖雪王海英 steve k.st.martin 沈阳农业大学农学院辽宁沈阳110866 The Ohio state University Columbus OH43210 USA

采用2个辽宁省育成的有限结荚习性大豆品种和2个美国俄亥俄州立大学育成的亚有限结荚习性品种进行杂交和回交,对其后代生育时期结构的遗传改良效应进行了研究。结果表明:有限结荚习性亲本生殖生长期、开花期、结荚期的天数均显著低于亚... 详细信息

采用2个辽宁省育成的有限结荚习性大豆品种和2个美国俄亥俄州立大学育成的亚有限结荚习性品种进行杂交和回交,对其后代生育时期结构的遗传改良效应进行了研究。结果表明:有限结荚习性亲本生殖生长期、开花期、结荚期的天数均显著低于亚有限结荚习性亲本,用有限型品种做轮回父本或母本对其回交后代营养生长期和结荚期的天数均无显著影响,杂交母本对有限型亲本回交后代生育时期结构的影响较大,用亚有限型亲本做轮回亲本对其回交后代生育时期结构的影响也较大。

关键词：大豆杂交回交生育时期结构遗传改良

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异常热报告的确认（英文）

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电化学(中英文) 2024年第2期 49-54页

作者： steven B. k.ivit Melvin H. Miles New Energy Times University of La Verne(Retired)

本文首次确认Nathan Lewis及其合作者于1989年5月1日在美国马里兰州巴尔的摩举行的美国物理学会(APS)会议上所犯的关键计算错误。Lewis等人分析了martin Fleischmann及其合作者报告的9轮实验中的热测量结果,并报告在没有催化复合的情况... 详细信息

本文首次确认Nathan Lewis及其合作者于1989年5月1日在美国马里兰州巴尔的摩举行的美国物理学会(APS)会议上所犯的关键计算错误。Lewis等人分析了martin Fleischmann及其合作者报告的9轮实验中的热测量结果,并报告在没有催化复合的情况下每轮实验都显示出异常的热功率损失。而本文使用相同的原始数据,经过正确的计算,再次确认每轮实验都显示出异常的功率增益。因此,这些数据意味着可能存在一种能产生能量的新物理现象。

关键词：低能核反应 LENR 超热

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CFD-DEM simulation of turbulence modulation in horizontal pneumatic conveying

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Particuology 2017年第2期15卷 15-24页

作者： Mohammadreza Ebrahimi martin Crapper Institute for Infrastructure and Environment School of Engineering The University of Edinburgh The King's Buildings Edinburgh EH9 3JL UK Department of Mechanical and Construction Engineering Northumbria University Ellison Place Newcastle-upon-Tyne NE1 8ST UK

A study is presented to evaluate the capabilities of the standard k.ε turbulence model and the k.ε turbulence model with added source terms in predicting the experimentally measured turbulence modulation due to the presence of particles in horizontal pneumatic conveying, in the context of a CFD–DEM Eulerian–Lagrangian simulation. Experiments were performed using a 6.5-m long, 0.075-m diameter horizontal pipe in conjunction with a laser Doppler anemometry （LDA） system. Spherical glass beads with two sizes, 1.5 and 2 mm, were used. Simulations were performed using the commercial discrete element method software EDEM, coupled with the computational fluid dynamics pack.ge FLUENT. Hybrid source terms were added to the conventional k.ε turbulence model to tak. into account the influence of the dispersed phase on the carrier phase turbulence intensity. The simulation results showed that the turbulence modulation depends strongly on the model parameter Cε3. Both the standard k.ε turbulence model and the k.ε turbulence model with the hybrid source terms could predict the gas phase turbulence intensity trend only generally. A noticeable discrepancy in all cases between simulation and experimental results was observed, particularly for the regions close to the pipe wall. It was also observed that in some cases the addition of the source terms to the k.ε turbulence model did not improve the simulation results when compared with those of the standard k.ε turbulence model. Nonetheless, in the lower part of the pipe where particle loading was greater due to gravitational effects, the model with added source terms performed somewhat better.

关键词： Turbulence modulation Pneumatic conveying Eulerian-Lagrangian approach Laser Doppler anemometry

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Exploiting Virtual Elasticity of Production Systems to Respect OTD—Part 3: Basic Considerations for Modelling CPPS Characterized by Non-Ergodic Order Entry and Non-Deterministic Product-Mix for Fully Flexible Addressable Work.0}ations

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American Journal of Operations Research 2022年第2期12卷 19-63页

作者： Bruno G. Rüttimann martin T. stöck.i Eidgenö ssische Technische Hochschule Zürich IWF Zurich Switzerland Inspire AG Zurich Switzerland

The recently experienced hype concerning the so-called “4th Industrial Revolution” of production systems has prompted several papers of various subtopics regarding Cyber-Phdysical Production Systems (CPPS). However, important aspects such as the modelling of CPPS to understand the theory regarding the performance of highly non-ergodic and non-deterministic flexible manufacturing systems in terms of Exit Rate (ER), Manufacturing Lead Time (MLT), and On-Time Delivery (OTD) have not yet been examined systematically and even less modeled analytically. To develop the topic, in this paper, the prerequisites for modelling such systems are defined in order to be able to derive an explicit and dedicated production mathematics-based understanding of CPPS and its dynamics: switching from explorative simulation to rational modelling of the manufacturing “physics” led to an own and specific manufacturing theory. The findings have led to enouncing, among others, the Theorem of Non-Ergodicity as well as the Batch Cycle Time Deviation Function giving important insights to model digital twin-based CPPS for complying with the mandatory OTD.

关键词： On-Time-Delivery Production System Industry 4.0 CPPS IoT stochastic Arrival Rate Non-Ergodic Process Virtual Elasticity Production Capacity Nominal Mean Exit Rate Theorem of Non-Ergodicity Non-Deterministic Product-Mix TFL AGV Scheduling Algorithm Digital Twin

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