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In situ strength of coal bed based on the size effect study on the uniaxial compressive strength

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International Journal of mining Science and Technology 2014年第6期24卷 747-754页

作者： Gonzatti C. zorzi L. Agostini I.m. Fiorentini J.A. Viero A.P. Philipp R.P. Department of mineralogy and Petrography of the Federal University of Rio Grande do Sul Brazil Foundation for Science and Technology of Rio Grande do Sul State Brazil

In the early 1990 s, the Foundation for Science and Technology of Rio Grande do Sul State(CIENTEC)developed a pioneering study in Brazil, related to the simultaneous mining of multiple coal *** of the activities included detailed studies on the geomechanical characterization of materials present in the Irapua coal seam, under exploitation in the A-Sangao mine, located near the city of Criciuma-SC,within the South-Catarinense coalfield. The goal of the laboratory tests was to define the behavior of the uniaxial compressive strength of the Irapua coal seam and establish a first approximation for the in situ strength value of this coal seam, since existing knowledge is solely based on practical mining experience over the years. Large samples of the coal seam were collected, using special techniques to maintain the integrity of the material, and a set of 56 uniaxial compression tests in cubic specimens, with side length ranging from 4.5 to 31 cm, were conducted in laboratory. This paper describes the experimental techniques used in the assays, and also presents the uniaxial compression strength results ***, important aspects of this type of study are considered, highlighting the size effect for the carbonaceous bed and the estimation of in situ strength values for the Irapua coal seam.

关键词： Size effect In situ strength Coal seam lrapua

The challenges of m2m massive access in wireless cellular networks

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Digital Communications and Networks 2015年第1期1卷 1-19页

作者： Andrea Biral marco Centenaro Andrea Zanella Lorenzo Vangelista michele zorzi Department of Information Engineering of the University of Padova

The next generation of communication systems, which is commonly referred to as 5G, is expected to support, besides the traditional voice and data services, new communication paradigms, such as Internet of Things(IoT) and machine-to-machine(m2m) services, which involve communication between machine-Type Devices(mTDs) in a fully automated fashion, thus, without or with minimal human intervention. Although the general requirements of 5G systems are progressively taking shape, the technological issues raised by such a vision are still partially unclear. Nonetheless,general consensus has been reached upon some specific challenges, such as the need for 5G wireless access networks to support massive access by mTDs, as a consequence of the proliferation of m2m services. In this paper, we describe the main challenges raised by the m2m vision, focusing in particular on the problems related to the support of massive mTD access in current cellular communication systems. Then we analyze the most common approaches proposed in the literature to enable the coexistence of conventional and m2m services in the current and next generation of cellular wireless systems. We finally conclude by pointing out the research challenges that require further investigation in order to provide full support to the m2m paradigm.

关键词： m2m mTD mTC massive access 5G

Geo-environmental parametric 3D models of SARS-CoV-2 virus circulation in hospital ventilation systems

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Geoscience Frontiers 2022年第6期13卷 244-256页

作者： Carla Gabriela Carlot zorzi Alcindo Neckel Laércio Stolfo maculan Grace Tibério Cardoso Leila Dal moro Alexandre Almeida Del Savio Leopoldo D.Z.Carrasco marcos L.S.Oliveira Eliane Thaines Bodah Brian William Bodah Faculdade meridional IMED304-Passo Fundo-RS 99070-220Brazil Universidad de Lima Avenida Javier Prado Este 4600–Santiago de Surco 1503Peru Department of Civil and Environmental.Universidad de la Costa CUCCalle 58#55–66BarranquillaAtlánticoColombia State University of New York Onondaga Community College4585 West Seneca TurnpikeSyracuseNY 13215USA Thaines and Bodah Center for Education and Development 840 South Meadowlark LaneOthelloWA 99344USA

The novel coronavirus, SARS-CoV-2, has the potential to cause natural ventilation systems in hospital environments to be rendered inadequate, not only for workers but also for people who transit through these environments even for a limited duration. Studies in of the fields of geosciences and engineering,when combined with appropriate technologies, allow for the possibility of reducing the impacts of the SARS-CoV-2 virus in the environment, including those of hospitals which are critical centers for healthcare. In this work, we build parametric 3D models to assess the possible circulation of the SARS-CoV-2 virus in the natural ventilation system of a hospital built to care infected patients during the COVID-19 pandemic. Building Information modeling(BIm) was performed, generating 3D models of hospital environments utilizing Revit software for Autodesk CFD 2021. The evaluation considered dimensional analyses of 0°, 45°, 90° and 180°. The analysis of natural ventilation patterns on both internal and external surfaces and the distribution of windows in relation to the displacement dynamics of the SARS-CoV-2 virus through the air were considered. The results showed that in the external area of the hospital, the wind speed reached velocities up to 2.1 m/s when entering the building through open windows. In contact with the furniture, this value decreased to 0.78 m/s. In some internal isolation wards that house patients with COVID-19, areas that should be equipped with negative room pressure, air velocity was null. Our study provides insights into the possibility of SARS-CoV-2 contamination in internal hospital environments as well as external areas surrounding hospitals, both of which encounter high pedestrian traffic in cities worldwide.

关键词： COVID-19 global epidemic Dimensional analysis Wind velocity Hospital environment Contamination

Are monitoring and evaluation systems adequate to report the programmatic coverage of HIV services among key populations in countries?

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Infectious Diseases of Poverty 2019年第4期8卷 75-81页

作者： Jinkou Zhao Sonia Arias Garcia Ed Ngoksin Jesus maria Garcia Calleja Chinelo Ogbuanu Sandra Kuzmanovska Nicholas Oliphant David Lowrance Nathalie zorzi Peter m.Hansen Keith Sabin The Global Fund to fight AIDS Tuberculosis and MalariaChemin du Pommier 40Grand-Saconnex 1218GenevaSwitzerland Center for Global Health School of Public HealthNanjing Medical UniversityNanjingChina Jiangsu Provincial Center for Disease Control and Prevention NanjingChina Strateg ic Information and Evaluation Department the Joint United Nations Programme on HIV/AIDSGenevaSwitzerland Department of HIV/AIDS World Health OrganizationGenevaSwitzerland

There was no global guidance or agreement regarding when a country has an adequate system to report on the service packages among human immunodeficiency virus(HIV)key *** article describes an approach to categorizing the system in a country for reporting the service package among HIV key *** approach consists of four dimensions,namely the epidemiological significance,comprehensiveness of the service packages,geographic coverage of services,and adequacy of the monitoring *** proposed categorization approach utilizes available information and can inform the improvement of the service delivery and monitoring systems among HIV key populations.

关键词： services among service

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双能CT对髋关节假体松动疼痛的诊断价值

国际医学放射学杂志 2021年第6期 731-731页

作者： G.Foti A.Fighera A.Campacci S.Natali m.Guerriero C.zorzi 李博

髋关节假体的翻修越来越多,传统的X线摄影(CR)是管理并发症的主要工具。然而,与标准CT相比,虚拟单能成像的双能CT(DECT)能够减少假体周围的金属伪影。

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初级医疗中贯彻一种消化不良和幽门螺杆菌根除指导方针的作用

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世界核心医学期刊文摘（胃肠病学分册） 2005年第12期1卷 9-9页

作者： Cardin F. zorzi m. Bovo E. 李明 Dipartimento Anziano- Chirurgia Geriatrica Azienda Ospedaliera Via Giustiniani IT- 35100 Padova Italy

Background: many international guidelines address appropriateness, prescribing variability and drug- related expenditure in primary dyspepsia management. Aims: To evaluate the impact on general practitioner (GP) practice and healthcare costs of a participatory intervention to modify primary dyspepsia and Helicobacter pylori (Hp) infection management, by standardised implementation of an international guideline in the local setting, through a prospective, controlled before- and- after study. methods: Primary dyspepsia management was monitored in the Local Health District of Padua; 63 of all 354 local GPs (total patient population: 82,284) took part in a primary- care improvement programme. measured variables were: mean prescri- bed gastroscopies/1,000 registered patients, mean expenditure/1,000 registered patients for antisecretories (H2 blockers) and proton pump inhibitors (PPIs), inter- GP prescribing variability and adherence to guidelines, analysed through prospectively filled- out reports on GP consultations for dyspepsia. A 3- month pre- survey period was compared with a 6- month intervention period following implementation of an agreed guideline. Results: Compared to non- participating GPs, intervention yielded a 30 and 26.4% reduction in H2- blocker and PPI expenditure, respectively. Application of the guideline led to an upward trend in endoscopy prescriptions, coupled with a 7% increase in appropriate referrals. Intra- group variability marginally decreased; guideline compliance rose slightly. Conclusions: Participatory intervention can reduce prescribing variability among GPs and inappropriate esophagogastroduodenoscopies, lowering related costs. Results may not have been spectacular, but in view of the number of patients involved, they may have an important impact on Local Health District expenditure.

关键词：菌根指导方针抗酸药消化道内镜检查胃镜检查医疗保健支出机构监督受体拮抗剂服从性临床实践

The enhanced X-ray Timing and Polarimetry mission—eXTP

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Science China(Physics,mechanics & Astronomy) 2019年第2期62卷 3-27页

作者： ShuangNan Zhang Andrea Santangelo marco Feroci YuPeng Xu FangJun Lu Yong Chen Hua Feng Shu Zhang Sφren Brandt margarita Hernanz Luca Baldini Enrico Bozzo Riccardo Campana Alessandra De Rosa YongWei Dong Yuri Evangelista Vladimir Karas Norbert meidinger Aline meuris Kirpal Nandra Teng Pan Giovanni Pareschi Piotr Orleanski QiuShi Huang Stephane Schanne Giorgia Sironi Daniele Spiga Jiri Svoboda Gianpiero Tagliaferri Christoph Tenzer Andrea Vacchi Silvia Zane Dave Walton ZhanShan Wang Berend Winter Xin Wu Jean J.m.in't Zand mahdi Ahangarianabhari Giovanni Ambrosi Filippo Ambrosino marco Barbera Stefano Basso Jörg Bayer Ronaldo Bellazzini Pierluigi Bellutti Bruna Bertucci Giuseppe Bertuccio Giacomo Borghi XueLei Cao Franck Cadoux Francesco Ceraudo TianXiang Chen Yu Peng Chen Jerome Chevenez marta Civitani Wei Cui WeiWei Cui Thomas Dauser Ettore Del monte Sergio Di Cosimo Sebastian Diebold Victor Doroshenko michal Dovciak YuanYuan Du Lorenzo Ducci Qingmei Fan Yannick Favre Fabio Fuschino JoséLuis Ga'lvez min Gao mingYu Ge Olivier Gevin marco Grassi QuanYing Gu YuDong Gu DaWei Han Bin Hong Wei Hu Long Ji Shumei Jia WeiChun Jiang Thomas Kennedy Ingo Kreykenbohm Irfan Kuvvetli Claudio Labanti Luca Latronico Gang Li maoShun Li Xian Li Wei Li ZhengWei Li Olivier Limousin HongWei Liu XiaoJing Liu Bo Lu Tao Luo Daniele macera Piero malcovati Adrian martindale malgorzata michalska Bin meng massimo minuti Alfredo morbidini Fabio muleri Stephane Paltani Emanuele Perinati Antonino Picciotto Claudio Piemonte JinLu Qu Alexandre Rachevski Irina Rashevskaya Jerome Rodriguez Thomas Schanz ZhengXiang Shen LiZhi Sheng JiangBo Song Liming Song Carmelo Sgro Liang Sun Ying Tan Phil Uttley Bo Wang DianLong Wang GuoFeng Wang Juan Wang LangPing Wang YuSa Wang Anna L.Watts XiangYang Wen Jörn Wilms ShaoLin Xiong JiaWei Yang Sheng Yang YanJi Yang Nian Yu WenDa Zhang Gianluigi Zampa Nicola Zampa Andrzej A.Zdziarski Aimei Zhang Chengmo Zhang Fan Zhang Long Zhang Tong Zhang Yi Zhang XiaoLi Zhang ZiLiang Zhang BaoSheng Zhao ShiJie Zheng Yu Peng Zhou Key Laboratory for Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Sciences Institut für Astronomie und Astrophysik Eberhard Karls Universität INAF-Istituto di Astrofisica e Planetologia Spaziali INFN-Roma Tor Vergata Via della Ricerca Scientifica 1 Department of Engineering Physics and Center for Astrophysics Tsinghua University DTU Building 327DK-2800 Kongens Institute of Space Sciences 08193 Cerdanyola del Valles Institut d’Estudis Espacials de Catalunya Sezione di Pisa Istituto Nazionale di Fisica NucleareLargo Bruno Pontecorvo3 Department of Astronomy University of Genevachemin d’Ecogia 16 Osservatorio di Astrofisica e Scienza Dello Spazio di Bologna Istituto Nazionale di Astofisica Astronomical Institute Czech Academy of Sciences max Planck Institute for Extraterrestrial Physics Giessenbachstr.1 CEA Paris-Saclay/IRFU Beijing Institute of Spacecraft System Engineering CAST Osservatorio Astronomico di Brera Istituto Nazionale di Astofisica Space Research Center Polish Academy of Sciences Key Laboratory of Advanced material microstructure of Education ministry of China Institute of Precision Optical EngineeringSchool of Physics Science and EngineeringTongji University Department of Physics and Center for Astrophysics Tsinghua University Universita’degli Studi di Udine Via delle Scienze 206 mullard Space Science Laboratory University College London Department of Nuclear and Particle Physics University of Geneva SRON Netherlands Institute for Space Research Politecnico di milano Sezione di Perugia Istituto Nazionale di Fisica Nucleare Dipartimento di Fisica e Chimica Fondazione Bruno Kessler Dr.Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics Universität Erlangen-Nürnberg University of Pavia Department of ElectronicsInformation and Biomedical Engineering and INFN Pavia Sezione di Torino Istituto Nazionale di Fisica NucleareVia Pietro Giuria1 Department of Physics and Astronomy University of Leicester Sezione di Trieste Istituto Nazionale di Fisica Nucleare

In this paper we present the enhanced X-ray Timing and Polarimetry mission—eXTP. eXTP is a space science mission designed to study fundamental physics under extreme conditions of density, gravity and magnetism. The mission aims at determining the equation of state of matter at supra-nuclear density, measuring effects of QED, and understanding the dynamics of matter in strong-field gravity. In addition to investigating fundamental physics, eXTP will be a very powerful observatory for astrophysics that will provide observations of unprecedented quality on a variety of galactic and extragalactic objects. In particular, its wide field monitoring capabilities will be highly instrumental to detect the electro-magnetic counterparts of gravitational wave *** paper provides a detailed description of:(1) the technological and technical aspects, and the expected performance of the instruments of the scientific payload;(2) the elements and functions of the mission, from the spacecraft to the ground segment.

关键词： X-ray instrumentation X-ray polarimetry X-ray timing space mission:eXTP