检索结果-南通市图书馆

Method for prevention and control of spontaneous combustion of coal seam and its application in mining field

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2017年第5期27卷 839-846页

作者： Wei Lu Ying-Jiazi cao jerry C.Tien College of Mining and Safety Engineering Shandong University of Science & Technology Department of Civil Engineering Monash University

Spontaneous combustion of coal seam has been and continues to be a big problem in coal mines. It could pose great threat to the safety of the whole mine and all miners, especially when it occurs in or nearby coal mines. Besides, environment of area surrounded mines during combustion can be threatened where large amount of toxic gases including CO_2, CO, SO_2 and H_2S can be leased by fire in mine. Hence, it is important and significant for scholars to study the controlling and preventing of the coal seam fire. In this paper, the complicated reasons for the occurrence and development of spontaneous combustion in coal seam are analysed and different models under various air leakage situations are built as well. Based on the model and approximately calculation, the difficulty of fire extinguishment in coal seam is pointed out as the difficulty and poor effect to remove the large amount of heat released. Detailed measurements about backfilling and case analyses are also provided on the basis of the recent ten years' practice of controlling spontaneous combustion in coal seams in China. A technical fire prevention and control method has been concluded as five steps including detection, prevention, sealing, injection and pressure adjustment. However, various backfill materials require different application and environmental factors, so in this paper, analyses and discussion about the effect and engineering application of prevention of spontaneous combustion are provided according to different backfilling technologies and methods. Once the aforementioned fire prevention can be widely applied and regulated in mines, green mining will be achievable concerning mine fire prevention and control.

关键词： Spontaneous combustion of coal Prevention and control Pressure adjustment Mining field

Emerging trends and prospects of electroconductive bioinks for cell-laden and functional 3D bioprinting

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2022年第2期5卷 396-411页

作者： Harish K.Handral Vaishali P.Natu Tong cao jerry Y.H.Fuh Gopu Sriram Wen F.Lu Department of Mechanical Engineering National University of SingaporeSingaporeSingapore Faculty of Dentistry National University of SingaporeSingaporeSingapore NUS Centre for Additive Manufacturing(AM.NUS) SingaporeSingapore

Introduction 3D bioprinting offers a unique biofabrication platform that allows the generation of functional tissue constructs in a spatially/geometrically controlled and automated manner using a 3 D printer and *** serves as the carrier medium that provides the ideal physico-mechanical characteristics for printability,shape fidelity,and support;and a biological microenvironment for the living cells prior to,during.

关键词： printing functional printer

在线全文

学校读者我要写书评

暂无评论

多组分农药残留的快速分析

实验与分析 2009年第4期 28-30页

作者： Philip Wylie jerry Zweigenbaum Melissa Churley Chin-Kai Meng cao Zhe 安捷伦科技有限公司

近年来,食品安全的全球性关注度不断加强。被列入管制和监测范围的农药、兽药在数量和允许含量等方面都发生了极大的变化。不断出台的新规定，要求对农药,兽药残留进行全面充分的检测分析，同时对检测方法和仪器也提出了更高的要求：兼... 详细信息

近年来,食品安全的全球性关注度不断加强。被列入管制和监测范围的农药、兽药在数量和允许含量等方面都发生了极大的变化。不断出台的新规定，要求对农药,兽药残留进行全面充分的检测分析，同时对检测方法和仪器也提出了更高的要求：兼具高通量、高灵敏度和广泛的应用范围。本文就农药残留分析的仪器平台，常用手段以及一般流程作进行了归纳。

关键词：农药残留分析多组分检测分析兽药残留仪器平台食品安全监测范围高灵敏度

*** Based FGD By-Products For Use As Stabilization/Solidification Agents

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

*** Based FGD By-Products For Use As Stabilization/Solidific...

以石油焦/煤为燃料的大型CFB锅炉优化与环保技术研讨会

作者： Joel H.Beeghly jerry Bigham William Wolfe Dravo Lime Company Research Center.Piltsburgh.Pa 15225 The Ohio State University.Dept.of Agronomy.Columbus.OH 43210 The Ohio State University Dept.of EngineeringColumbusOH 43210

In dry flue gas desulfurization (FGD) systems the sorbent (usually slaked lime,limestone ordolomite) is injected directly into the furnace,into the ductwork after the furnace an lower temperature.,or into a spray dryer *** these processes produce a dry by-product which is removed in theparticulate control equipment,as opposed to wet scrubber system in which the by-product is a slurrycollected separately from the fly *** FGD scrubber by-products from lime or limestone injected directly into the furnace such asthird bed combustion (FBC) and LIMB (lime injected multistage burners) systems,have neutralization,sorption,and cementation propertics that make them potential reagents for hazardous and non-hazardouswaste stabilization because the dry sorbent by-products have high free quicklime (cao) contents andanhydrous calcium sulfate (CaSO) *** solidification reactions can take place,includinghydration,carbonation,pozzolanic activity and ettringite *** lime injection scrubber by-products such as from duct injection or spray dryer processes maynot be as effective for solidification because the free lime and calcium sulfite and sulfate are hydrateddue to humidification of the gas *** and physical properness of dry by-products from a number of sources for use asstabilization reagents are discussed as well as the reasons for differences among various *** will be made with other by-products,including class C and class F coal fly ash,cementkiln dust and lime kiln *** clean coal technologies using high sulfur coal reacted with lime or limestone had TCLPleachate concentrations of the 8 RCRA toxic metal elements that were low and very close to USEP Adrinking water *** stories involving the use of these materials for stabilization of toxic metals and some oilywastes have been reported and further suggestions are made for beneficial re-use.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

高电压小光斑X射线光管的设计与研制

真空科学与技术学报 2021年第3期41卷 301-305页

作者：阳恩会郭宗艳曹昌伟唐志宏肖永顺上海超群无损检测设备有限责任公司上海201615 清华大学安全检测技术研究院北京100083

X射线智能安全检查系统等应用场合,X射线光管的管电压和光斑大小直接影响系统的穿透度与分辨力,管电压越高,穿透力越强,光斑越小,分辨力越高,因此在国家重点研发计划的支持下,设计制造了一种管电压为200 kV、光斑大小为0.4 mm×0.4 mm... 详细信息

X射线智能安全检查系统等应用场合,X射线光管的管电压和光斑大小直接影响系统的穿透度与分辨力,管电压越高,穿透力越强,光斑越小,分辨力越高,因此在国家重点研发计划的支持下,设计制造了一种管电压为200 kV、光斑大小为0.4 mm×0.4 mm的高电压小光斑X射线光管。利用Lorentz电子光学设计软件与热模拟软件对此X射线光管的聚焦系统结构、高压结构和散热进行设计与模拟。研制的X射线光管测试表明,所设计的X射线光管光斑大小可以达到0.4 mm×0.4 mm要求,在实际工况条件下能稳定可靠工作,平均故障间隔时间大于15000 h。将研制的X射线光管应用于X射线智能检查系统,发现其分辨力和穿透力都优于对照组。

关键词：高电压小光斑 X射线管穿透力分辨力

Surgical treatment for both-column acetabular fractures using pre-operative virtual simulation and three-dimensional printing techniques

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2020年第4期133卷 395-401页

作者： Ji-Hui Huang Hui Liao Xin-Yu Tan Wei-Rong Xing Qi Zhou Yu-Shi Zheng Hong-Yu cao Can-Jun Zeng Department of Orthopedics The Third Affiliated Hospital of Southern Medical UniversityGuangzhouGuangdong 510630China Southern Medical University GuangzhouGuangdong 510515China Musculoskeletal Disease Center Jerry L.Pettis Memorial Veterans Affairs Medical CenterLoma LindaCA 92357USA Department of Medicine Loma Linda UniversityLoma LindaCA 92354USA

Background:Surgical treatment of both-column acetabular fractures is challenging because of the complex acetabular fracture patterns and the curved surface of the *** study has compared the application of three-dimensional(3D)printing technology and traditional methods of contouring plates intra-operatively for the surgical treatment of both-column acetabular *** presented the use of both 3D printing technology and a virtual simulation in pre-operative planning for both-column acetabular *** hypothesized that 3D printing technology will assist orthopedic surgeons in shortening the surgical time and improving the clinical ***:Forty patients with both-column acetabular fractures were recruited in the randomized prospective case-control study from September 2013 to September 2017 for this prospective study(***1900028230).We allocated the patients to two groups using block randomization(3D printing group,n=20;conventional method group,n=20).For the 3D printing group,1:1 scaled pelvic models were created using 3D printing,and the plates were pre-contoured according to the pelvic *** plates for the conventional method group were contoured during the operation without 3D printed pelvic *** operation time,instrumentation time,time of intra-operative fluoroscopy,blood loss,number of times the approach was performed,blood transfusion,post-operative fracture reduction quality,hip joint function,and complications were recorded and compared between the two ***:The operation and instrumentation times in the 3D printing group were significantly shorter(130.8±29.2 min,t=-7.5,P<0.001 and 32.1±9.5 min,t=-6.5,P<0.001,respectively)than those in the conventional method *** amount of blood loss and blood transfusion in the 3D printing group were significantly lower(500[400,800]mL,Mann-Whitney U=74.5,P<0.001 and 0[0,400]mL,Mann-Whitney U=59.5,P<0.001,respectively)than those in the conventional method group.T

关键词： Both-column Acetabulum fractures Computer simulation Three-dimensional printing Internal fracture fixation

在线全文

学校读者我要写书评

暂无评论

浅谈锅炉钢结构的监造

企业技术开发 2010年第A7期29卷 79-80页

作者：路毅曹洪霞上海鲁研电力设备监理有限公司山东济南250002

随着社会的不断发展,锅炉钢结构制造逐渐走向市场化。部分承包商在经济利益的驱使下,做出种种不正当的行为,如偷工减料、以次充好等。对于每个监造师来讲,为提高设备质量,保证设备供货进度,认真做好设备监理工作显得尤为重要。文章介绍... 详细信息

随着社会的不断发展,锅炉钢结构制造逐渐走向市场化。部分承包商在经济利益的驱使下,做出种种不正当的行为,如偷工减料、以次充好等。对于每个监造师来讲,为提高设备质量,保证设备供货进度,认真做好设备监理工作显得尤为重要。文章介绍了锅炉钢结构的见证内容和常见问题。

关键词：锅炉钢结构设备监造

在线全文

学校读者我要写书评

暂无评论

全自动毛巾折叠机的研究与设计

机械工程师 2023年第9期 72-74,77页

作者：安源徐明旭李松林曹长业曹可新陈浩东徐学正李贺吉林大学机械与航空航天工程学院长春130000 中车长春轨道客车股份有限公司长春130062 烟台杰瑞石油装备技术有限公司山东烟台264000 沈阳机床(集团)有限责任公司沈阳110142

根据产品的折叠要求,需要进行3次折叠、1次打卷,设计了一套“蛋卷式”毛巾自动折叠机,从而提高美观度、减少二次污染、提高生产效率并降低工人劳动强度。根据产品的折叠打卷要求,设计的毛巾折叠机主要分为3部分,分别为上料机构、折叠机... 详细信息

根据产品的折叠要求,需要进行3次折叠、1次打卷,设计了一套“蛋卷式”毛巾自动折叠机,从而提高美观度、减少二次污染、提高生产效率并降低工人劳动强度。根据产品的折叠打卷要求,设计的毛巾折叠机主要分为3部分,分别为上料机构、折叠机构和打卷机构。设计了气动回路图和控制流程图,应用欧姆龙CP1H系列PLC控制毛巾折叠机能够自动控制运行。采用以PLC为核心的控制系统,通过对控制程序进行优化,实现了各机构之间有序衔接,无需人工参与。该包装机具有自动上料、折叠、打卷3种功能,并能根据设计要求,完成每小时650条的任务量。毛巾自动折叠机的设计大大提高了毛巾的折叠效率,减少了人工劳动的工作量。同时折叠后的“蛋卷式”毛巾美观小巧且便于运输,提高了产品的经济效益。

关键词：毛巾折叠机构自动上下料 PLC控制打卷机构