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人工收薹原理下蒜薹收获机的设计

机械研究与应用 2024年第4期37卷 70-74页

作者：杨静张少强马兆毅鲜宝刚甘肃省天水师范学院机电与汽车工程学院甘肃天水741000 甘肃省天水市农业机械服务中心甘肃天水741000

首先,以天水地区种植品种白蒜、红蒜为研究对象,基于人工抽薹原理,实施了夹薹压缩实验、抽薹拉伸试验。试验表明:白蒜蒜薹茎秆粗壮,其抗压应力较红蒜蒜薹大11%左右,抽拔力较红蒜蒜薹大9.5%左右;两个品种力学性能的不同归结于微观结构不... 详细信息

首先,以天水地区种植品种白蒜、红蒜为研究对象,基于人工抽薹原理,实施了夹薹压缩实验、抽薹拉伸试验。试验表明:白蒜蒜薹茎秆粗壮,其抗压应力较红蒜蒜薹大11%左右,抽拔力较红蒜蒜薹大9.5%左右;两个品种力学性能的不同归结于微观结构不同。其次,建立了蒜薹收获机虚拟样机模型,并对抽薹过程进行了运动学分析,得出断薹率最小时机器前进速度与滚筒速度应满足的关系。在此基础上,设计了机械手的安装位置。最后,对夹薹过程进行仿真分析,得出蒜薹夹断时两夹薹轮的间隙为33.3 mm。研究结果为蒜薹收获机的结构设计提供理论依据。

关键词：蒜薹力学性能运动特性仿真分析

Degassing of deep-sourced CO_(2) from xianshuihe-Anninghe fault zones in the eastern Tibetan Plateau

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Science China Earth Sciences 2022年第1期65卷 139-155页

作者： Sheng XU Lufeng GUAN Maoliang ZHANG Jun ZHONG Wei LIU xian'gang XIE Congqiang LIU Naoto TAKAHATA Yuji SANO Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China Atmosphere and Ocean Research Institute The University of TokyoKashiwaChiba 277-8564Japan

A large number of gases are releasing from the medium-high temperature geothermal fields distributed along the large-scale strike-slip fault zones in the southeastern margin of the Tibetan *** this study,11 hot spring water and the associated bubbling gas samples were collected along the xianshuihe-Anninghe fault zones(XSH-ANHFZ)and analyzed for chemical and isotopic *** δ^(18)_(H_(2)O) and δD_(H_(2)O) values indicate that hot spring waters are predominantly meteoric origin recharged from different *** water samples are significantly enriched in Na^(+) and HCO_(3) due to the dissolution of regional evaporites,carbonates and Na-silicates.^(3)He/^(4)He ratios of the gas samples are 0.025-2.73 times the atmospheric *** ^(3)He/^(4)He ratios are high in the Kangding region where the dense faults are distributed,and gradually decrease with increasing distance from Kangding towards both sides along the xianshuihe fault zones(XSHFZ).Hydrothermal fluids have dissolved inorganic carbon(DIC)concentrations from 2 to 42 mmol L^(-1),δ^(13)C_(DIC) from -6.9‰ to 1.3‰,δ^(13)C_(CO_(2)) from -7.2‰ to -3.6‰ and Δ^(14)C from -997‰ to -909‰.Combining regional geochemical and geological information,the CO_(2)sources can be attributed to deep-sourced CO_(2)from mantle and metamorphism of marine carbonate,and shallow-sourced CO_(2)from the dissolution of marine carbonate and biogenic CO_(2).The mass balance model shows that 11±6% of the DIC is sourced from the dissolution of shallow carbonate minerals,9±8% formed by pyrolysis of sedimentary organic matter,80±9% derived from deep metamorphic origin and mantle-derived CO_(2).Among them,the deep-sourced CO_(2)in Anninghe fault zones(ANHFZ)is merely metamorphic carbon,whereas ca.12% and ca.88% of the deep-sourced CO_(2)in the XSHFZ are derived from the mantle and metamorphic carbon,*** average deep-sourced CO_(2)flux in the Kangding geothermal field is estimated to be 160 ta^(-1).If all the hot

关键词： Hot spring Fluid geochemistry Deep-sourced carbon xianshuihe-Anninghe fault zones Tibetan Plateau

The Up-conversion Laser Properties of a Non-polar Organic Dye and the Influence of Solvents and Pumping Wavelengths

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Chinese Chemical Letters 2006年第1期17卷 81-84页

作者： Xiao Qiang YU xian ZHANG Gui Bao XU Hua Ping ZHAO Wei HE Zong Shu SHAO xian gang XU Min Hua JIANG The National Key Lab of Crystal Materials Shandong University Jinan 250100

A non-polar organic dye, E, E-1, 4-bis[4＇-（N,N-dibutylamino）styryl]-2,5-dimethoxybenzene （DBASDMB）, has been synthesized and characterized, and its structure has been determined. Pumped with a 200fs pulse this dye showed the up-conversion laser properties. The influences of various organic solvents and different pumping wavelength on the laser properties have been demonstrated.

关键词： Up-conversion laser two-photon absorption non-polar organic dye.

Main controlling factor and mechanism of gas-in-place content of the Lower Cambrian shale from different sedimentary facies in the western Hubei area, South China

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Petroleum Science 2024年第3期21卷 1488-1507页

作者： gang Li xian-Ming Xiao Bo-Wei Cheng Chen-gang Lu Yue Feng Dong-Sheng Li School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Frontiers Science Center for Deep-time Digital Earth China University of Geosciences(Beijing)Beijing100083 China

The Lower Cambrian shale gas in the western Hubei area,South China has a great resource prospect,but the gas-in-place(GIP)content in different sedimentary facies varies widely,and the relevant mechanism has been not well *** the present study,two sets of the Lower Cambrian shale samples from the Wells YD4 and YD5 in the western Hubei area,representing the deep-water shelf facies and shallowwater platform facies,respectively,were investigated on the differences of pore types,pore structure and methane adsorption capacity between them,and the main controlling factor and mechanism of their methane adsorption capacities and GIP contents were *** results show that the organic matter(OM)pores in the YD4 shale samples are dominant,while the inorganic mineral(IM)pores in the YD5 shale samples are primary,with underdeveloped OM *** pore specific surface area(SSA)and pore volume(PV)of the YD4 shale samples are mainly from micropores and mesopores,respectively,while those of the YD5 shale samples are mainly from micropores and macropores,*** methane adsorption capacity of the YD4 shale samples is significantly higher than that of the YD5 shale samples,with a maximum absolute adsorption capacity of 3.13 cm^(3)/g and 1.31 cm^(3)/g in average,*** with the shallow-water platform shale,the deep-water shelf shale has a higher TOC content,a better kerogen type and more developed OM pores,which is the main mechanism for its higher adsorption *** GIP content models based on two samples with a similar TOC content selected respectively from the Wells YD4 and YD5 further indicate that the GIP content of the deep-water shelf shale is mainly 34 m^(3)/t within a depth range of 1000—4000 m,with shale gas exploration and development potential,while the shallow-water platform shale has normally a GIP content of<1 m^(3)/t,with little shale gas *** the geological and geochemical conditions of shale gas formation a

关键词： Lower Cambrian shale Deep-water shelf facies Shallow-waterplat form facies Pore structure Methane adsorption Gas-in-place content Controlling factor

鄂尔多斯盆地延长组等时格架下的深水坡折带特征及其对砂体的控制作用

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天然气地球科学 2024年第10期35卷 1764-1776页

作者：陈波刘长春李杰王义俊杨雯婷雷启鸿户彬李德胜冷先刚赵中平中国石油长庆油田分公司陇东油气开发分公司甘肃庆阳745000 西安珠峰油气科技有限公司陕西西安710021

鄂尔多斯盆地三叠系延长组依据传统似等厚岩性地层划分方案识别出的沉积坡折带有待商榷。采用井震结合、标志层控制、逐井反复对比等综合方法,通过对多个典型标志层的识别和追踪对比,建立了鄂尔多斯盆地西南部环县地区延长组长7段—长4+... 详细信息

鄂尔多斯盆地三叠系延长组依据传统似等厚岩性地层划分方案识别出的沉积坡折带有待商榷。采用井震结合、标志层控制、逐井反复对比等综合方法,通过对多个典型标志层的识别和追踪对比,建立了鄂尔多斯盆地西南部环县地区延长组长7段—长4+5段部分地层的等时地层格架,并在此基础上识别出了具有典型地貌学特征的深水沉积坡折带。结果表明,环县地区延长组长7段—长4+5段实际由从西南往东北呈多期逐渐减薄的“S”型楔状前积层构成,其内部各套等时地层发育一系列坡折明显且逐渐往东北迁移的深水沉积坡折带,这些坡折带相对于长7段底界最大倾角可达1.9°、宽约6~8.6 km;各期重力流砂体和致密油层主要分布在坡折带处或坡折带前端的斜坡坡脚处,且平行于坡折带呈带状展布,坡折带控砂和控藏作用明显。研究对其他地区延长组深水沉积坡折带的有效识别和油气勘探开发具有重要的借鉴意义。

关键词：鄂尔多斯盆地延长组等时地层格架坡折带砂体

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考虑岩体流变的岩质边坡稳定性数值分析

四川建材 2024年第3期50卷 60-62,68页

作者：徐智涵刘显刚周靖霖黄显耀黄元贵州省贵阳公路管理局贵州贵阳550000

岩石材料具有流变特性已是公认的事实,为探讨流变特性对岩质边坡稳定性的影响,在深入剖析边坡变形机理的基础上视岩体长期强度为边坡的峰值应力并以达到稳定后的岩质边坡为研究对象。引入有限元强度折减系数法,采用ABAQUS软件对既有文... 详细信息

岩石材料具有流变特性已是公认的事实,为探讨流变特性对岩质边坡稳定性的影响,在深入剖析边坡变形机理的基础上视岩体长期强度为边坡的峰值应力并以达到稳定后的岩质边坡为研究对象。引入有限元强度折减系数法,采用ABAQUS软件对既有文献实例边坡的稳定性进行对比分析。结果表明:考虑流变(视岩体长期强度为边坡围岩峰值应力),得到的有关结果与文献工程实际基本吻合,否则与实际偏差很大且不利于边坡工程的长期稳定。因此,理论研究及工程实际中,应兼顾到岩体的流变特性,以确保边坡围岩的长期稳定与安全。研究结果可为边坡稳定性分析的理论研究与工程实践提供一定借鉴。

关键词：流变特性岩质边坡稳定性分析长期强度

纳米乳液:性能、制备及在非常规油气开发中的应用进展

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应用化工 2024年第2期53卷 362-367页

作者：殷俊荣陈宇琪张百川王金冉鲜成钢贾文峰油气资源与探测国家重点实验室中国石油大学北京102249 中国石油大学(北京)非常规油气科学技术研究院北京102249

从尺寸、制备方法、热力学及动力学稳定性等方面详细地对纳米乳液和微乳液的特点与不同进行了综述,分析了影响纳米乳液稳定性的主要因素及失稳机理。系统介绍了纳米乳液的制备方法、驱油与助排机理,对其影响因素进行了总结,并对纳米乳... 详细信息

从尺寸、制备方法、热力学及动力学稳定性等方面详细地对纳米乳液和微乳液的特点与不同进行了综述,分析了影响纳米乳液稳定性的主要因素及失稳机理。系统介绍了纳米乳液的制备方法、驱油与助排机理,对其影响因素进行了总结,并对纳米乳液在非常规油气藏开发中的应用现状进行了综述。开发新型低成本、高效的制备方法及研究新型耐温耐盐型纳米乳液是下一步研究的主要方向。

关键词：纳米乳液微乳液驱油助排非常规油气

MOCVD Growth of GaAs/Al_(x)Ga_(1-x)As Superlattices and Their Smoothing Effects

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Chinese Physics Letters 1992年第2期9卷 109-112页

作者： XU xian'gang HUANG Baibiao REN Hongwen LIOU Shiwen JIANG Minhua Institute of Crystal Materials Shandong UniversityJi'nan 250100

This paper presents metalorganic chemical vapor deposition(MOCVD)growth of GaAs/Al_(x)Ga_(1-x)As superlattices in our *** structures are characterized by using cros&-sectional transmission electron microscopy,and the results show that they are in agreement with designed *** superlattice used as buffer layer can smooth out interface *** high mobility of Ga-containing species and the anisotropic growth rate of GaAs on different facets lead to the planarization of the wavy interface;whereas the low mobility of Al-containing species tends to preserve the surface shape.

关键词： MOCVD mobility

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受载岩石与混凝土声发射特性对比实验研究

四川大学学报（工程科学版） 2010年第2期42卷 82-87页

作者：尹贤刚四川大学水利水电学院四川成都610065 长沙矿山研究院湖南长沙410012

通过室内加载岩石和混凝土的实验方法,测试了两类不同性质的岩石以及混凝土的破裂全过程的力学特征及其声发射特性,得到了岩石和混凝土破坏全过程力学特性曲线、声发射事件累积数、声发射事件率等相关曲线及参数,研究了声发射事件数、... 详细信息

通过室内加载岩石和混凝土的实验方法,测试了两类不同性质的岩石以及混凝土的破裂全过程的力学特征及其声发射特性,得到了岩石和混凝土破坏全过程力学特性曲线、声发射事件累积数、声发射事件率等相关曲线及参数,研究了声发射事件数、事件率、应力水平与时间参数之间的关系。通过对比岩石和混凝土声发射特性,指出了岩石声发射特性与混凝土声发射特性的相似与不同之处,以及两类不同性质岩石本身声发射特性的区别。研究着重讨论了一次性加载过程中混凝土与塑性阶段明显的岩石在加载接近峰值强度时都出现明显的"耗时"现象,指出存在这种现象的试样在此阶段声发射事件率出现明显下降,出现声发射相对平静,而对于塑性阶段不明显岩石来说,这一阶段则基本不存在明显的"耗时"现象,声发射的监测中也没有相对平静现象。此外,还对时间参数在声发射监测研究中的重要性进行了总结和分析,指出常规室内岩石力学研究中可以忽略的时间参数在声发射研究中应该被足够地重视。

关键词：岩石混凝土声发射特性声发射平静期时间