检索结果-南通市图书馆

Infrared emissivity and microwave absorbing property of epoxy-polyurethane/annealed carbonyl iron composites coatings

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第3期55卷 623-628页

作者： chen yanpeng XU GuoYue GUO TengChao ZHOU Ning College of Material Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The microwave absorption property and infrared emissivity have been investigated for the single-layer coating made of the epoxy-polyurethane resin and carbonyl iron powders with variation of annealing treatment. Microwave-absorbing property was investigated by measuring the complex permittivity and complex permeability of the absorber in the frequency range from 2 to 18 GHz. Infrared emissivity value was measured using IR-2 Infrared Emissometer in the wavelength range of 8-14 μm. After annealing, the Fe （110） peak became sharp, and the crystallization improved significantly. Annealing treatment could reduce the sttrface energy of powders, improve compatibility between fillers and adhesives, and result in increase of the density of the coating. The lowest value of infrared emissivity （0.419） was obtained from the coating made of the carbonyl iron powder annealed at 700℃ for 1 h. With the variation of the annealing temperature, the magnetic and dielectric properties of the carbonyl iron particle were changed. The maximum reflection loss decreased and the matching frequency shifted to lower frequency with increasing the annealing temperature of carbonyl iron particles, which coincided with the variation of the complex permeability and permittivity according to the annealing temperature. Magnetic loss factor and dielectric loss factor of carbonyl iron particles were improved with increasing the annealing temperature in the 2-18 GHz range.

关键词： carbonyl iron infrared emissivity microwave absorbing property annealing treatment

Underground coal gasification and its strategic significance to the development of natural gas industry in China

在线全文

学校读者我要写书评

暂无评论

Petroleum Exploration and Development 2019年第2期46卷 205-215页

作者： ZOU Caineng chen yanpeng KONG Lingfeng SUN Fenjin chen Shanshan DONG Zhen Research Institute of Petroleum Exploration & Development PetroChina China National Petroleum Corporation

Based on the present situation and trend of underground coal gasification in China and overseas, this article puts forward the basic concept, mechanism and mode of underground coal gasification, and presents the challenges, development potential and development path now faced. In China, underground coal gasification which is in accord with the clean utilization of coal can produce "artificial gas", which provides a new strategic approach to supply methane and hydrogen with Chinese characteristics before new energy sources offer large-scale supply. Coal measure strata in oil-bearing basins are developed in China, with 3.77 trillion tons coal reserves for the buried depth of 1000-3 000 m. It is initially expected that the amount of natural gas resources from underground coal gasification to be 272-332 trillion cubic meters, which are about triple the sum of conventional natural gas, or equivalent to the total unconventional natural gas resources. According to the differences of coal reaction mechanism and product composition of underground coal gasification, the underground coal gasification can be divided into three development modes, hydrogen-rich in shallow, methane-rich in medium and deep,supercritical hydrogen-rich in deep. Beyond the scope of underground mining of coal enterprises, petroleum and petrochemical enterprises can take their own integration advantages of technologies, pipeline, market and so on, to develop underground coal gasification business based on their different needs and technical maturity, to effectively exploit a large amount of coal resources cleanly and to alleviate the tight supply of natural gas. It can also be combined with using the produced hydrogen in nearby area and the CO_2 flooding and storage in adjacent oil areas to create a demonstration zone for net zero emissions of petroleum and petrochemical recycling economy. It is significant for reserving resources and technologies for the coming "hydrogen economy" era, and opening up a

关键词： coal underground coal gasification natural gas gas revolution coal-made methane coal-made hydrogen supercritical water supercritical water gasification

栓塞治疗合并冠状动脉-支气管动脉瘘咯血患者一例

在线全文

学校读者我要写书评

暂无评论

中华介入放射学电子杂志 2024年第3期12卷 284-286页

作者：邵天朋周英文陈延鹏宋兆伟沧州市中心医院放射介入科河北沧州061001 沧州市中心医院磁共振成像科河北沧州061001

患者,女性,72岁,因"间断咯血10余年,加重1 d"于2021年3月25日入沧州市中心医院。既往10余年前出现咯血症状,于沧州市中心医院呼吸科确诊为支气管扩张合并咯血,内科治疗好转出院,出院后偶有咳嗽,痰中带血。此次入院前1 d无明显诱因再次... 详细信息

患者,女性,72岁,因"间断咯血10余年,加重1 d"于2021年3月25日入沧州市中心医院。既往10余年前出现咯血症状,于沧州市中心医院呼吸科确诊为支气管扩张合并咯血,内科治疗好转出院,出院后偶有咳嗽,痰中带血。此次入院前1 d无明显诱因再次出现咯血,鲜红色,出血量在30 mL左右。入院实验室检查:血常规、肝肾功能及凝血常规均正常。

关键词：咯血冠状动脉-支气管动脉瘘介入栓塞

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

非常规油气高质量发展战略方向优选

石油科技论坛 2024年第3期43卷 24-31页

作者：刘朝霞鲍敬伟陈建军郭建林陈艳鹏中国石油勘探开发研究院

近10年来,化石能源多样化趋势明显,从常规油气领域向致密油/页岩油、致密气/页岩气、煤炭地下气化等非常规领域发展。油气藏类型增多,资源规模、品位、勘探开发难度及效益存在差异。要实现不同类型油气藏规模效益开发及绿色高质量发展,... 详细信息

近10年来,化石能源多样化趋势明显,从常规油气领域向致密油/页岩油、致密气/页岩气、煤炭地下气化等非常规领域发展。油气藏类型增多,资源规模、品位、勘探开发难度及效益存在差异。要实现不同类型油气藏规模效益开发及绿色高质量发展,必须对化石能源未来发展方向和类型做出选择。分析国内外能源消费结构变化规律、现状及未来发展趋势,煤炭和石油一直保持主体地位,天然气占比逐年上升。对比研究不同类型化石能源单位体积能量密度、资源规模、开发成本、开发现状、技术成熟度等主要指标,结果显示煤炭地下气化具有能量密度最高、可采资源量最大、开采成本低等特点,在增加天然气供应、推动煤炭行业绿色低碳发展和助力实现碳中和方面拥有技术优势,可优选为非常规油气战略方向,为高质量发展开拓新路径。

关键词：非常规油气发展方向煤炭地下气化关键属性能量密度资源量开发成本

Application of Isogeometric Analysis Method in Three-Dimensional Gear Contact Analysis

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第4期139卷 817-846页

作者： Long chen Yan Yu yanpeng Shang Zhonghou Wang Jing Zhang School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai200093China Zhejiang Fine-Motion Robot Joint Technology Co. Ltd.Taizhou317600China

Gears are pivotal in mechanical drives,and gear contact analysis is a typically difficult problem to *** isogeometric analysis(IGA)methods have developed new ideas to solve this *** this paper,a threedimensional body parametric gear model of IGA is established,and a theoretical formula is derived to realize single-tooth contact *** were benchmarked against those obtained from commercial software utilizing the finite element analysis(FEA)method to validate the accuracy of our *** findings indicate that the IGA-based contact algorithmsuccessfullymet theHertz contact *** juxtaposed with the FEA approach,the IGAmethod demonstrated fewer node degrees of freedomand reduced computational units,all whilemaintaining comparable ***,the IGA method appeared to exhibit consistency in analysis accuracy irrespective of computational unit density,and also significantlymitigated non-physical oscillations in contact stress across the tooth *** underscores the prowess of IGA in contact *** conclusion,IGA emerges as a potent tool for addressing contact analysis challenges and holds significant promise for 3D gear modeling,simulation,and optimization of various mechanical components.

关键词： Contact analysis involute gear isogeometric analysis finite element analysis

碳中和“超级能源系统”内涵、路径及意义——以鄂尔多斯盆地为例

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

石油勘探与开发 2024年第4期51卷 924-936页

作者：邹才能李士祥熊波陈艳鹏张国生谢小平刘翰林马锋梁英波朱凯关春晓潘松圻侯梅芳袁懿琳罗双涵中石油深圳新能源研究院有限公司深圳518000 中国石油勘探开发研究院北京100083 西南石油大学经济管理学院成都610000

超级含油气盆地为推动社会进步和人类发展提供了能源基础,在气候变化与“碳达峰碳中和”背景下,构建兼顾能源生产与碳中和的“超级能源系统”是转型方向。在加快构建以新能源、新电力、新储能、新智能“四新为主”的绿色+智慧能源体系... 详细信息

超级含油气盆地为推动社会进步和人类发展提供了能源基础,在气候变化与“碳达峰碳中和”背景下,构建兼顾能源生产与碳中和的“超级能源系统”是转型方向。在加快构建以新能源、新电力、新储能、新智能“四新为主”的绿色+智慧能源体系框架下,以巨量地下煤炭/石油/天然气/地热与地上丰富风光能源资源高度叠合、化石能源与新能源融合协同开发利用的区域性智慧用能系统构成的“超级能源系统”与以碳循环为主线的碳中和系统相融合,在传统含油气盆地中研究选择具备建成世界级能源生产与碳中和示范大基地条件的碳中和“超级能源盆地”。鄂尔多斯盆地区位优势明显,化石能源和新能源资源丰富,CO_(2)源汇匹配优势显著,具备建成世界级能源生产与碳中和盆地的基础条件,以鄂尔多斯盆地为代表的碳中和“超级能源盆地”给出了传统含油气盆地转型方向。“煤炭+石油+天然气+新能源+CCUS(碳捕集、利用与封存)/CCS(碳捕集与封存)”融合发展理念与模式下,盆地区域内基本实现碳中和,进一步夯实能源生产保供能力,助力“双碳”目标实现,建立现代能源产业体系,推动地区绿色可持续发展。在中国率先建成以鄂尔多斯盆地为代表的世界级碳中和“超级能源系统”示范盆地,将重塑超级能源盆地勘探开发新理念与新模式,对全球“碳中和”下的能源革命具有重大意义。

关键词：超级能源系统碳中和系统碳中和“超级能源系统” 碳中和“超级能源盆地” 鄂尔多斯盆地

同方期刊数据库

Experimental study on ice monitoring method for 10 kV transmission line with tangent tower in alpine landform

在线全文

学校读者我要写书评

暂无评论

High Voltage 2024年第1期9卷 182-194页

作者： Lin Yang Zhiqiang chen yanpeng Hao Xinhao Lin Lei Yu Yue Li Zhiyong Yuan Licheng Li School of Electric Power South China University of TechnologyGuangzhouChina Electrical Power Research Institute China Southern Power GridGuangzhouChina Electric Power Research Institute of Guizhou Power Grid Co.Ltd. GuizhouChina

Ice monitoring methods were applied for 110 kV and above transmission lines with tangent ***,the change in the vertical span is not considered,and a significant difference lies in the tower-conductor structure of 10 kV transmission *** this reason,a proposal is made about the ice monitoring method for the 10 kV transmission line with tangent tower in alpine landform,which includes the ice monitoring system based on pressure measurement and corresponding equivalent ice thickness calculating *** methods calculate the vertical span under different height difference coefficients.A finite element simulation model and a simulated ice load experiment system are established based on real conductors and *** and simulations under four simulated terrains are conducted within 2.5–20 mm ice thickness *** comparison is made between this method and the method without considering the change in vertical *** results show that the two methods are consistent and the relative errors are lower than�4%in simulation and�10%in experiment when the height difference coefficient is *** it is not 0,the relative errors of this method fall between t0.38%and t6.78%in simulation and−6.40%to t6.60%in experiment,while the relative errors of the method without considering the change in vertical span ranges between−11.13%and−20.23%in simulation and−11.65%to−23.20%in experiment.

关键词： methods tangent method

A dispersion-based impact identification method:mechanical model and experimental verification

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2024年第7期40卷 80-91页

作者： Zishang Liu Tianyu chen Kun Zhang yanpeng Wei Yacong Guo Bingchen Wei Key Laboratory of Microgravity(National Microgravity Laboratory) Institute of MechanicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Key Laboratory for Mechanics in Fluid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China

External transient impact loads widely exist in the service environment of various engineering structures,and urgent engineering and military application requirements call for research on the theory and method of impact *** manuscript proposes a method to identify the impact *** employing the dispersive property of wave propagation through the waveguides,a dispersion-based average power spectral density(PSD)curve for quantitative representation of the dispersion is established,and its evolution law is investigated to apply the identification of impact *** critical parameters of the average PSD curve are obtained by analyzing the response of the structure from the perspective of *** effectiveness of this method is verified through the development of the triple-successive-impact split Hopkinson bar and the triple-successive-impact *** the method proposed in this manuscript,a kind of impact identification under multiple impact loads,which is not convenient to measure directly by the sensor,is realized,especially in the case of highly transient external impact.

关键词： Structural impact Dispersion Structure vibration Waveguides Impact identification

Current Situation and Outlook of CBM Industry in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Oil & Gas 2013年第2期20卷 32-36页

作者： Lei Huaiyu Sun Fenjin chen yanpeng PetroChina Exploration and Production Company Research Institute of Petroleum Exploration and Development-Langfang

Current situation of CBM industry in China China is abundant in CBM with a resource buried shallower than 2000 meters of 36.81 tcm and recoverable resource of 10.87 tcm. This resource base is favorable

关键词：煤层气产业中国展望煤层气资源煤层气勘探埋藏深度产业现状可采资源