检索结果-南通市图书馆

A fast and accurate model for the creation of explosion fragments with improved fragment shape and dimensions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第2期18卷 159-169页

作者： David Felix ian Colwill Paul Harris School of Computing Engineering&MathematicsUniversity of BrightonBrightonUK Engineering and Design(Alumni) University of SussexBrightonUK

Explosion models based on Finite Element Analysis(FEA)can be used to simulate how a warhead *** their execution times are *** protection systems need to make very fast predictions,before a fast attacking weapon hits the *** execution times are also needed in real time simulations where the impact of many different computer models is being ***,FEA explosion models are not appropriate for these real-time *** research presented in this paper delivers a fast simulation model based on Mott’s equation that calculates the number and weight of fragments created by an *** addition,the size and shape of fragments,unavailable in Mott’s equation,are calculated using photographic evidence and a distribution of a fragment’s length to its *** model also identifies the origin of fragments on the warhead’s *** results are verified against experimental data and a fast execution time is achieved using uncomplicated simulation *** developed model then can be made available for real-time simulation and fast computation.

关键词： Distribution of fragments Fragment shape Real-time simulation Cylindrical explosion

Knowledge Practical Attitude of Health Professionals on Breast Cancer at the Hospital of the District of the Commune IV of Bamako

在线全文

学校读者我要写书评

暂无评论

Surgical Science 2024年第5期15卷 342-356页

作者： Moussa Samaké Souleymane B. Dembelé Sirama Diarra Yely Dianessy Abdou Guiré Dorcas Laurel Sodjiné Yede Amaguiré Saye Brahima Dembele Birama Traoré Thierno Nadio Ibrahima Maiga Mahamane Dicko Modibo Diarra Siaka Konaté Amadou Maiga Bakary Tientigui Dembele adégné Togo General Surgery Department of Bamako District IV Hospital Bamako Mali Obstetric Gynecology Department of the Bamako District IV Hospital Bamako Mali Department of Ophthalmology of the Hospital of the District of the Commune IV of Bamako Bamako Mali Imaging Service of the Bamako District IV Hospital Bamako Mali Anesthesia and Resuscitation Service of the Hospital of the District of the Commune IV of Bamako Bamako Mali Internal Medicine Department of the District Hospital of Commune IV of Bamako Bamako Mali General Surgery Department Kolondjeba Referral Health Centre Sikasso Mali General Surgery Department of the Gabriel Touré University Hospital Bamako Mali

Introduction: The level of knowledge and attitude of health professionals about breast cancer are important determinants. General objective: To study the knowledge, attitude and practice of health professionals of the hospital of the district of the commune IV on breast cancer. Methodology: This was a cross-sectional, prospective, descriptive, qualitative and quantitative study. The study period was from 01 October 2022 to December 2022. Results: In one week of survey, 110 health workers (intern, obstetrician nurse, general practitioners and specialists) received the survey sheet, 80 health workers informed it, a participation rate of 73%. The male sex was most represented at 63.75% with a sex ratio of 1.76. The average age was 39.59 years with extremes of 22 and 61 years. The clinical signs evoked by the participants were: breast nodule (81.25%), followed by breast discharge (48.75%). In relation to risk factors: interns and obstetrician nurses had no good knowledge, 51.72% of general practitioners had good knowledge, 43.48% of specialist doctors had good knowledge, and 5.88% of the wise had good knowledge. Conclusion: Breast cancer is a common pathology around the world, health professionals are at the forefront of the fight against breast cancer, and this fight cannot be effective without trained personnel.

关键词： Knowledge Attitude Practice Health Personnel Breast Cancer

Lag times in toe-to-heel air injection(THAI)operations explain underlying heavy oil production mechanisms

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2022年第3期19卷 1165-1173页

作者： Wei Wei ian D.Gates Department of Chemical and Petroleum Engineering University of CalgaryCalgaryAlbertaCanada

From a time value of revenue point of view,it is preferred that the time between reservoir stimulation and oil production response is *** oil combustion processes have a lag time between air injection and liquid production,but the common practice in production data analysis uses simultaneous injection and production data when seeking a relationship between *** this research,the time scales of production for the Kerrobert toe-to-heel air injection(THAI)heavy oil project in Saskatchewan,Canada,is analyzed by using cross correlation analysis,*** delay analysis between air injection and oil *** results reveal two time scales with respect to production response with two distinctive recovery mechanisms:(1)a short time scale response(nearly instantaneous)where oil production peaks right after air injection(directly after opening production well)reflecting cold heavy oil production mechanisms,and(2)a longer time scale(of order of 100-300 days)response where peak production occurs associated with the collective phenomena of air injection,heat generating reactions,heat transfer,and finally,heated mobilized heavy oil drainage to the production *** understanding of the two time scales and associated production mechanisms provides a basis for improving the performance of THAI.

关键词： Heavy oil In situ combustion Toe-to-heel air injection(THAI) Production analysis Lag time

The Roper-Suffridge extension operator and classes of biholomorphic mappings Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2006年第11期49卷 1539-1552页

作者： GRAHAM ian KOHR Gabriela Department of Mathematics University of Toronto TorontoOntario M5S 2E4Canada Faculty of Mathematics and Computer Science Babes-Bolyai University 1 M. Kogǎlniceanu Str. 400084 Cluj-NapocaRomania

In this paper we give a survey about the Roper-Suffridge extension operator and the developments in the theory of univalent mappings in several variables to which it has led. We begin with the basic geometric properties (most of which now have a number of different proofs)and discuss relations with the theory of Loewner chains and generalizations and modifications of the operator, some of which are very recent.

关键词： convex mapping, starlike mapping, Roper-Suffridge operator, growth theorem, distortion theorem, covering theorem, Loewner chain, parametric representation,extreme points, linear invariant family.

The ballistic performance of the bombard Mons Meg

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2016年第2期12卷 59-68页

作者： ian LEWTAS Rachael MCALISTER adam WALLIS Clive WOODLEY ian CULLIS QinetiQ Fort Halstead

The bombard Mons Meg, located in Edinburgh Castle, with a diameter of 19 inches(48 cm), was one of the largest calibre cannons ever *** in 1449 and presented to King James II of Scotland in 1454, Mons Meg was used in both military and ceremonial roles in Scotland until its barrel burst in 1680. This paper examines the history, internal, external and terminal ballistics of the cannon and its shot. The likely muzzle velocity was estimated by varying the propellant type and the cannon profile was investigated to identify weak spots in the design that may have led to its failure. Using the muzzle velocity calculated from the internal ballistics, simulations were performed with granite and sandstone shot for varying launch angle and ground temperature. The likely trajectory and range of the cannonballs are described. The internal and external ballistics informed the initial conditions of the terminal ballistic impact scenarios. The performance of the cannonball against both period and modern targets, in the form of a pseudo-castle wall and a monolithic concrete target, respectively, were simulated and are presented and discussed.

关键词：弹道性能 Meg 内弹道计算 19英寸速度估计地面温度弹道冲击苏格兰

在线全文

学校读者我要写书评

暂无评论

会计专业数智化人才培养改革演进与意义建构

红河学院学报 2024年第2期22卷 53-58页

作者：代军邱玉莲武汉科技大学管理学院湖北武汉430065

文章选取浙江大学管理学院为对象,研究了高校会计数智化培养改革演变过程中的意义建构范式。研究发现,案例对象的改革演进先后经历了人才改革培养方案制定、智能财务专业成立起步、产学研贯通协同育人等三个阶段,各阶段的意义建构范式... 详细信息

文章选取浙江大学管理学院为对象,研究了高校会计数智化培养改革演变过程中的意义建构范式。研究发现,案例对象的改革演进先后经历了人才改革培养方案制定、智能财务专业成立起步、产学研贯通协同育人等三个阶段,各阶段的意义建构范式分别是:受限的意义建构、介于受限与导向明确之间的意义建构、导向明确的意义建构。研究认为:意义建构活动能够提升各利益相关方的认知,并以此为指导,调整人才培养实施行为,进而影响到高校会计数智化人才培养改革的实施效果;其中,促发因素表现出由外到内,由被动到主动,由短期到可持续的演变规律;意义建构的控制主体表现出逐步下沉,控制程度逐渐降低,控制作用非线性的变化规律;意义建构的接受主体呈现出活跃度由低向高、由管理层向基层教师、由学校向校外企业逐渐转化的变化规律。

关键词：数智化人才培养意义建构会计专业

Self-assembly and chemical processing of block copolymers:A roadmap towards a diverse array of block copolymer nanostructures

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2013年第8期56卷 1040-1066页

作者： WYMAN ian LIU GuoJun Department of Chemistry Queen's University

Block copolymers can yield a diverse array of *** assembly structures are influenced by their inherent structures,and the wide variety of structures that can be prepared especially becomes apparent when one considers the number of routes available to prepare block copolymer *** examples include self-assembly,directed assembly,coupling,as well as hierarchical assembly,which can yield assemblies having even higher structural *** assembly routes can also be complemented by processing techniques such as selective crosslinking and etching,the former technique leading to permanent structures,the latter towards sculpted and the combination of the two towards permanent sculpted *** combination of these pathways provides extremely versatile routes towards an exciting variety of *** review will attempt to highlight destinations reached by LIU Guojun and coworkers following these pathways.

关键词： block copolymers self-assembly chemical processing crosslinking

Biodiversification of Late Ordovician Hirnantia Fauna on the Upper Yangtze Platform,South China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2010年第12期53卷 1800-1810页

作者： ian G.PERCIVAL Geological Survey of New South Wales NSW Department of Primary Industries947-953 Londonderry RoadLondonderryNSW 2753Australia

The Hirnantia Fauna is a globally-represented,cool water brachiopod fauna that originated and flourished in shallow marine environments at intermediate to low latitudes after the first episode of the end-Ordovician mass *** was well-developed,widely distributed,long in stratigraphical range,and complex in palaeoecological differentiation on the Upper Yangtze Platform of the South China paleoplate,where it has been extensively *** and quantitative analyses show that the Fad of the Hirnantia Fauna in South China becomes stratigraphically higher from nearshore to offshore localities on the Yangtze Platform,while the range of the fauna becomes shorter whereas the taxonomic diversity *** its stratigraphical range the diversity of the Hirnantia Fauna at nearshore localities consistently decreases,but trends in the opposite direction at offshore,deeper water *** fauna was represented by different communities,subcommunities or associations with changing environmental factors(such as water depth and substrate) at different localities or horizons.

关键词： Hirnantia Fauna biodiversification Ordovician Hirnantian Upper Yangtze Platform South China

ZIKA-How fast does this virus mutate?

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2016年第2期37卷 110-115页

作者： ian S.LOGAN Parkside Drive Exmouth Devon UK EX8 4LB. ianlogan22@***.

The World Health Organization has declared the present Zika virus epidemic to be a ＇Public Health Emergency of International Concern＇. The virus appears to have spread from Thailand to French Polynesia in 2013, and has since infected over a million people in the countries of South and Central America. In most cases the infection is mild and transient, but the virus does appear to be strongly neurotropic and the presumptive cause of both birth defects in fetuses and Guillain-Barr6 syndrome in some adults. In this paper, the techniques and utilities developed in the study of mitochondrial DNA were applied to the Zika virus. As a result, it is possible to show in a simple manner how a phylogenetic tree may be constructed and how the mutation rate of the virus can be measured. The study showed the mutation rate to vary between 12 and 25 bases a year, in a viral genome of 10 272 bases. This rapid mutation rate will enable the geographic spread of the epidemic to be monitored easily and may also prove useful in assisting the identification of preventative measures that are working, and those that are not.

关键词： Zika Virus Polyprotein Mutation rate Phylogenetic tree