Motion modeling and formation form analysis of spacecraft near collinear libration points

To meet the increasing research demand for deep space exploration,especially for the second libration point (L2) conditional periodic orbit (Halo orbit) in the Sun-Earth system,the methods to get analytical Halo orbit and differential-correction Halo orbit were described firstly,and the corresponding orbits accuracy was analyzed.Then,based on the results of third-order and differential-correction Halo orbits,the formation form was studied.Analysis was carried out to discuss the influence of system amplitude,initial phase,and phase difference on the formation form,as well as that of initial orbit values on form accuracy.Finally,some simulation results demonstrate the validity of the proposed methods.

Numerical simulation of splat formation dynamics in plasma spray forming

Plasma spray forming shows overwhelming advantages in rapid fabricating parts and moulds. The coating microstructure is strongly dependent on the splat morphology and inter-splat contact nature. Therefore,it is necessary to investigate the splat formation mechanism in order to analyze the coating properties. A dynamical process of a single fully molten droplet impacting onto a smooth surface was investigated. At the same time,the interaction between the two molten droplets in the horizontal and vertical directions was also simulated. Finally,the simulations of impact of a molten droplet on an inclined plane and a sharp edge were presented. It is concluded that the relative distance of the two droplets strongly influences the dynamics of the two droplets interaction. The various surface conditions have direct effects on the dynamics of splat formation. When a droplet impacts onto an inclined surface and a sharp edge,the splat morphology changes obviously and the phenomenon of break up is observed.

Model Analysis of Initial Hydration and Strueture Forming of Portland Cement

The auto efficiently hydration heat arrangement and the non-contacting electrical resistivity device were used to test the therrnology effect and the resistivity variation of Portland cement hydration. The structure forming model of Portland cement initial hydration was established through the systematical experiments with different cements, the amount of mixing water and the chemical admixture. The experimental results show that, the structure forming model of cement could be divided into three stages, i e, solution-solution equilibrium period, structure forming period and structure stabilizing period. Along with the increase of mixing water, the time of inflexion appeared is in advance for thermal process of cement hydration and worsened for the structure forming process. Comparison with the control specimen, adding Na2SO4 makes the minimum critical point lower, the flattening period shorter and the growing slope after stage one steeper. So the hydration and structure forming process of Portland cement could be described more exactly by applying the thermal model and the structure-forming model.

Characteristics of the ore forming fluid from the zinc poly-metallic deposit in the Mopan mine area,Guangxi Nandan

Fluid inclusions from samples from the layered and veined mineralized belt in the Mopan mine area were studied using microscopic temperature measurements and laser Raman spectroscopy.Further studies were conducted on the nature and source of the ore forming fluid and on the mechanism of deposit formation.The results show that there are three types of inclusions that occur in both the layered and veined ore body.These are liquid inclusions,CO 2 inclusions with a liquid phase,and NaCl-H 2 O multiphase inclusions.The fluid inclusions in both the layered and veined ore bodies have similar characteristics.The ore forming fluid is strongly reducing,was exposed to low to medium temperatures,salinity,and pressures.The source of this ore forming fluid was a mix of submarine volcanic spring(blow-piping),magmatic hydrothermal jet,and underground water.

Foam Forming: An Effective Method to Prepare Polyimide Fiber-based Paper

Well-dispersed fiber suspension is the precondition of good paper formation. Compared with cellulosic fibers, synthetic fibers are prone to flocculate because of their long length and hydrophobic nature, resulting in poor paper formation. To solve this problem, dispersants and extremely low forming consistency are typically adopted during the traditional wet-forming process, which cause a large amount of water consumption and treatment cost. Therefore, increasing forming consistency without compromising paper formation remains a challenge for papermakers. In this work, foam forming was adopted to disperse polyimide fibers (PI) with high forming consistency. The results showed that the formation index of handsheets increased when the bubble size and distribution became small and narrow. Compared with traditional wet-forming process with the same consistency (0.4%), the formation index of handsheets by foam forming increased by approximately 100% when C8 alkyl glucoside (APG08) concentration reached 16 g/L. Notably, forming consistency could increase by eight times while keeping the same level of paper formation. Overall, foam forming exhibits great advantages in dispersing long fiber and reducing water consumption and environmental pressure, and has potential applications in specialty paper made of long fibers.

准噶尔盆地玛湖凹陷风城组储层致密化过程与成藏模式研究——以玛西地区风二段为例

准噶尔盆地玛湖凹陷风城组作为全油气系统的典型实例,是未来规模油藏勘探开发的潜在区域。本文以岩心、铸体薄片及生产动态等资料为基础,明确了玛湖凹陷风城组储层致密化过程与油气成藏模式。取得认识如下:1)晚二叠世压实作用起主导作用,风二段盐类矿物、结晶白云石脱玻化作用形成较多微小孔隙空间;早三叠世有机酸的溶蚀作用促进了储层空间的有效发育,早侏罗世白云化作用强烈,有机酸进一步溶蚀长石、碳酸盐矿物;2)晚二叠世风城组储层未致密,早三叠中后期部分岩相开始致密化,至早侏罗世开始大部分储层已致密,仅储层局部存在甜点区;3)晚二叠世成藏动力表现为浮力和生烃增压共同发挥作用,早三叠世以后逐渐以生烃增压为主要动力,发展成为源内—近源—源外的全油气系统成藏特点。通过上述研究,以期为玛湖凹陷风城组下一步油气勘探提供支撑。

鄂尔多斯盆地东缘奥陶纪马家沟期边界断层的新认识及其对成钾凹陷的控制

鄂尔多斯盆地陕北盐盆奥陶系马家沟组具备良好的成钾潜力,然而,当前仅勘探到薄钾石盐矿层和厚层钾石盐矿化段,大规模钾盐矿尚未发现。通过分析鄂尔多斯盆地东缘地震剖面的构造特征,认为盆地东缘晋西挠褶带西部马五6亚段沉积期存在活动边界正断层。在该断层作用下,形成东断西超的活动同沉积凹陷,富钾卤水大量汇聚于此。在持续干旱的强蒸发环境下,卤水持续浓缩,成钾窗口出现,钾石盐大规模析出,进而形成整装海相优质固体钾石盐矿床。侏罗纪末期,挤压应力导致成钾凹陷抬升,形成古凹今隆的格局,钾盐层抬升至较浅部位,有利于水溶法经济开采。

西秦岭洛大式菱铁矿矿床的基本成矿要素

洛大式菱铁矿分布于甘肃南秦岭成矿带,由翠古山铁矿、绿坝铁矿、洛大铁矿、查居铁矿和柴马山铁矿等小型矿床组成;主要矿石矿物为菱铁矿,其次为黄铁矿和赤铁矿;矿床成因类型一直被认为是沉积型或沉积改造型(1)。考虑大型矿床的发现往往源于对中小型矿床的研究(Richards,2013).

Discovery and geological knowledge of the large deep coal-formed Qingyang Gas Field, Ordos Basin, NW China

After 50 years of oil and gas exploration in Longdong area of southwest Ordos Basin,NW China,a deep coal-formed gas field was discovered for the first time in Qingyang area.Through observation of field outcrops and core,analysis of common,cast and cathode thin sections,Ro and other geochemistry indexes,carbon isotope,electron microscope and other supporting tests and analyses,the hydrocarbon generation,reserves formation and reservoir formation characteristics of gas reservoirs at different buried depths in Yishaan slope were examined and compared.The deep gas reservoir has an average buried depth of more than 4200 m,and the main gas-bearing formation is the Member 1 of Lower Permian Shanxi Formation,which is characterized by low porosity,low permeability,low pressure and low abundance.It is believed that hydrocarbon generation in thin seam coal source rocks with high thermal evolution can form large gas fields,high-quality sandstone reservoirs with dissolved pores,intergranular pores and intercrystalline pores can still develop in late diagenetic stage under deep burial depth and high thermal evolution,and fractures improve the permeability of reservoirs.High drying coefficient of natural gas and negative carbon isotope series are typical geochemical characteristics of deep coal-formed gas.The integrated exploration and development method has been innovated,and the economic and effective development mode of gas fields of"dissecting sand body by framework vertical wells,centralized development by horizontal wells"has been formed.The discovery and successful exploration of the large gas field has provided geological basis and technical support for the construction of natural gas fields of 100 billion cubic meter scale in the southwest of the basin,and has important guidance for exploration of coal-derived gas with deep buried depth and high thermal evolution widely distributed in China.

碳中和目标下运动康养形态和业态研究

随着全球气候变化问题的日益严峻,碳中和成为各国共同追求的目标。在这个背景下,运动康养作为绿色、低碳、健康的生活方式,受到了广泛的关注。该文旨在探讨碳中和目标下运动康养的形态和业态发展,分析其对社会、经济和环境的影响,并提出相应的政策建议。同时,该文还就如何进一步推动运动康养事业的可持续发展,提出了具有针对性的政策建议。

矿田构造岩相学填图理论及应用

开展成矿蚀变−构造岩相解析建相和建模预测研究已成为矿田构造与找矿预测的创新方向之一。文章对国内外8类重要的成矿蚀变−构造岩相模型和形成机制进行论述总结,南美洲智利科皮亚波地区IOCG型矿田受到主岛弧带−弧相关盆地及岩浆叠加−盆地变形样式的复合控制,而中国云南东川沉积岩型铜矿床(SSC型)+IOCG型铁铜矿田受陆缘裂谷盆地、盆地变形构造样式和岩浆叠加侵入构造系统的复合控制。中国内蒙古甲−查浅成低温热液型银铅锌矿田受火山洼地、火山穹隆构造、火山岩岩相类型和火山热液隐爆角砾岩的复合控制,而深成岩浆弧控制了蒙古国南戈壁斑岩型金铜钼−浅成低温热液金银矿田;中国秦岭热水沉积型(SEDEX)银铜铅锌−菱铁矿−重晶石矿田受到陆缘拉分盆地内三级热水沉积盆地、同生断裂带和热水沉积岩相的控制。大陆造山带内不同层次的脆韧性剪切带,控制了金矿田和金钼多金属矿田定位。在新疆塔西盆−山−原镶嵌区盆地系统内,侏罗系煤系烃矿源岩是金属矿田和天然气气田的成矿成藏物质供给源区;乌拉根砂砾岩型天青石−铅锌矿田受到山前挤压—伸展转换盆地、气成热流柱构造和山前冲断褶皱带的复合控制;萨热克铜多金属矿田赋存于旱地扇杂砾岩,受到对冲式厚皮型逆冲推覆断裂带和幔源热流柱带的复合控制。其中在矿集区−矿田尺度上,电气石热流柱构造、岩浆气囊构造、复合岩溶构造岩相等是成矿蚀变−构造岩相的3种新类型;在归纳前期对矿田构造岩相、矿田构造古地理单元和典型矿田构造岩相形成机制研究基础上,文章提出了矿田成矿蚀变−构造岩相类型的新划分方法和划分原则方案,并划分确定了12种变形构造岩相类型。研究成果为矿田构造研究和找矿预测提供了新理论和新方法支撑。

鄂尔多斯盆地中东部二叠系山西组深层煤岩地球化学特征及成煤环境

鄂尔多斯盆地蕴含丰富的煤岩气资源,展现出了巨大的煤岩气勘探开发潜力,煤岩的地球化学特征及其指示的沉积条件、古气候信息可以为煤岩气的形成及有利区优选提供重要依据。为了探究鄂尔多斯盆地中东部二叠系山西组5号煤岩地球化学特征及煤岩发育控制因素,在钻井岩心观察、采样的基础上对5号煤岩进行了煤工业组分及全硫含量、镜质体随机反射率(R_(o))和主微量的测试分析,并揭示了煤岩的成煤环境。研究结果表明:①5号煤岩类型以光亮煤、半亮煤为主,灰分含量为6.04%~29.00%,平均为17.23%,挥发分含量为12.21%~35.05%,平均为21.61%,水分含量为0.49%~0.78%,平均为0.63%,全硫含量为0.10%~1.49%,平均为0.53%,Ro为1.75%~1.84%,平均为1.79%;②主元素化合物以SiO_(2)和Al_(2)O_(3)为主,微量元素以Sr、Ba,稀土元素以Ce为主,含量整体较高,稀土元素以轻稀土元素富集为主,上地壳分配模式曲线具有Eu负异常特征,表明5号煤岩聚煤过程中未受到深部热液影响;③结合m_(Sr)/m_(Ba)、GI^(*)、m^(Sr)/m^(Cu)及分布特征分析,表明5号煤岩主要形成于三角洲前缘低位沼泽相和三角洲平原潮湿森林沼泽相,整体以咸水、温湿的还原环境水体为主,且沉积水体北部偏酸性,南部偏碱性,5号煤岩的聚煤过程整体受到海侵作用控制。结论认为,研究成果深化了鄂尔多斯盆地中东部山西组5号煤岩地球化学特征及煤岩发育控制因素的认识,为深层煤岩气的勘探开发提供理论依据。

藤本壮介建筑思想之研究

该文主要研究了藤本的建筑思想与建筑理论。首先讨论了藤本的建筑思想的三个原则:概念的对立、秩序的衍生和形态的生成等,分别对应着关系说、偶然性和无形化等深层建筑理论策略。其次讨论了藤本建筑理论的三个方面:无形式的形式,消解的功能和偶然性的方法。

连山关地区铀矿地质钻探技术优化

由于连山关地区存在着地层复杂、岩石胶结松散、水敏性强等诸多不利因素,钻探施工中存在钻孔漏失、掉块卡钻以及坍塌埋钻等问题,导致钻孔报废,降低了铀矿地质钻探施工的经济效益。为了解决以上问题,以ZK93-1孔钻为对象,针对铀矿地质地层特性以及常用设备、泥浆等存在的不利因素,对钻孔设备进行优化,选用CSD-1800A型全液压动力头钻机、HQ绳索取心钻具,并配备镦粗钻杆的NQ绳索取心钻具,提高了钻进效率及安全性,也降低了劳动强度;选用成膜防塌无固相冲洗液,有效降低钻孔偏斜,保证了岩矿心采取率,降低了施工成本,为类似地质条件地区的钻探工作提供参考依据。

宗族型传统聚落空间形态特征与保护研究——以山西省介休市南贾村为例

宗族型传统聚落往往基于单个或多个宗族聚居发展形成,宗族的兴衰变迁与行为活动影响着聚落本身的空间形态特征。文章对山西省介休市的宗族型传统聚落南贾村进行剖析,分析其宗族文脉与宗族结构,以及聚落空间形成演变中的不同阶段,解读南贾村的宗族结构与聚落空间形态特征的联系。并且根据研究和现场调研情况,对南贾村空间形态的现状进行总结,分析聚落空间保护中存在的问题和不足,基于宗族视角提出相应的保护策略方法,为宗族型传统聚落保护提供借鉴和参考。

西湖凹陷平北地区武云亭凝析气田形成条件与成藏特征

基于对武云亭地区烃源岩、储层、圈闭等油气藏形成基本条件的总结,系统分析油气特征及来源、压力分布与断层封闭、油气充注历史及油气运聚成藏过程,建立武云亭凝析气田成藏模式。研究表明,武云亭洼广泛分布的煤系烃源岩和宁波27主洼烃源岩生烃能力强、断层和砂岩尖灭耦合形成大型构造-岩性复合圈闭、三角洲沉积优质储集体发育、有利的断-砂配置、盖层质量好等因素共同构成了武云亭凝析气田形成的基础。武云亭油气田平湖组中下部成藏组合具有“武云亭洼煤系源岩供烃、源内持续弱超压充注”成藏特征;中上部成藏组合具有“武云亭洼和宁波27洼双源供烃、侧向持续强充注”成藏特征,早期双向来源原油与晚期大规模侧向来源高熟气混合形成凝析气藏。武云亭油气田总体上具有“早期油晚期气,多期成藏,连续充注”的特征,建立“多源持续强充注-断砂联控”成藏模式。

跨海区域砾砂地层泥水盾构泥浆成膜效果试验研究

为揭示泥水盾构开挖面泥浆成膜规律,以青岛地铁8号线泥水盾构掘进的跨海区间为工程背景,阐述不同级配下泥浆的渗透成膜过程,分析高聚物、处理剂作用下3种泥膜形成机理,并结合特定砾砂地层设计成膜装置,采用控制变量法开展室内试验,选用2种粒径细砂调节泥浆级配,分析不同掺量制浆材料(NSHS-3)作用下的泥浆性质。试验结果表明:与粒径小于0.01 mm的细砂相比,粒径小于0.25 mm的细砂形成的渗透带抓抱效果较好且更适配砾砂地层。地层的颗粒级配相同时,泥浆黏度越高,其稳定性越高,泥膜容易形成且厚度较薄、质密、滤水量低,但添加剂过量会引起部分土颗粒聚沉,未加压时便附着在开挖面,进而堵塞盾构管道运输系统,泥膜稳定性较差且造成资源浪费。B6号泥浆加压过程中滤水清澈,滤失量较小,形成的“泥皮+渗透带”型泥膜强度较高,能保证开挖面稳定且絮凝较少,经济性较好。研究结论为类似地层泥水盾构施工改良提供参考。

造山型金矿容矿建造分类、成矿模式及找矿勘查

造山型金矿床指造山过程中形成的后生脉状金矿床,受构造、建造双重控制,是全球最重要的金矿勘查类型。按容矿岩石建造的不同,造山型金矿可分为绿岩带型(包括绿片岩型、BIF型和花岗-片麻岩型3个亚类型)、浊积岩型、碳酸盐岩型和浅成侵入岩型,构成了造山型金矿床完整的成矿谱系。不同类型之间具有紧密的时空和成因联系,可互为找矿标志。绿岩组合和浊积岩系具有高的金丰度,既是容矿岩系,也是重要的矿源层,多类型造山作用驱动大规模区域性流体活动,造就了造山型金矿省/巨型成矿带,岩浆流体叠加和“热机效应”是形成超大型金矿床的重要因素。构建了多源区域性流体+岩浆流体叠加的地壳连续成矿模型和造山型金矿区域成矿模式,强调了多旋回造山作用对造山型金矿的成矿意义。“富金矿源层+剪切变形带+浅成侵入岩”组合是大型金矿系统的勘查选区标志,靶区优选的目标是获取找矿潜力大的优质矿权;矿权区勘查的优先目标是发现可规模化露天开采的矿床(体),通过化探异常评价和浅钻追索次生富集带,可快速发现主矿体;矿区深部找矿(深度>300 m)潜力巨大,主攻目标是资源量大、品位高的热液通道相的厚板状或筒状矿体。

鄂尔多斯盆地上古生界煤岩气成藏地质条件及勘探方向

为了进一步提高鄂尔多斯盆地煤岩气勘探开发效益,综合钻井、录井和分析测试等资料,从盆地尺度上系统地研究了上古生界煤系地层聚煤环境、煤质特征、储层物性和含气性,分析了盆地煤岩气成藏条件,总结了煤岩气勘探开发关键技术,评估了盆地煤岩气资源,并指出了煤岩气的勘探方向。研究结果表明:①盆地石炭纪本溪期海陆交互相沉积与二叠纪山西期陆相三角洲沉积发育形成广泛分布的煤岩,热演化程度较高,镜质组含量高,生烃规模大。②盆地深层煤质优良,以光亮煤和半亮煤为主,煤体结构良好,以原生结构煤为主,固定碳含量高,挥发分和灰分产率低。③煤岩储层发育储集空间包括气孔、植物组织孔和无机矿物质孔,割理和裂隙发育,平均孔隙度为4.80%,平均渗透率为2.35 mD,属于致密储层;煤岩平均含气量为22.53 m^(3)/t,其中游离气平均含量为5.65 m^(3)/t,占总含气量的25.08%。④煤岩与上覆不同岩性形成了煤岩-泥岩、煤岩-石灰岩和煤岩-砂岩3种储盖组合,控制了游离气富集分布,提出了“源储一体、持续生烃、盖层封堵”的煤岩气成藏模式。⑤在煤岩气勘探实践中形成了地震地质综合建模、水平井钻完井、压裂改造和限压排采等一系列配套工程技术。⑥盆地本溪组8号煤岩和山西组5号煤岩埋深1500 m以深煤岩叠合总面积16.70×104 km^(2),估算煤岩气总资源量23.47×10^(12) m^(3)。其中8号煤岩分布面积10.63×104 km^(2),煤岩气资源量17.43×10^(12) m^(3);5号煤岩分布面积6.06×104 km^(2),煤岩气资源量6.04×10^(12) m^(3)。结论认为:①鄂尔多斯盆地煤岩气地质条件优越,资源潜力巨大,勘探配套技术已基本形成,煤岩气勘探开发前景良好;②神木周边、榆林周边、乌审旗周边、米脂北、佳县、绥德、吴堡、大宁-吉县等区带8号煤岩,神木-伊金霍洛旗、榆林-佳县、乌审旗北、横山-子洲等区带5号煤岩是近期煤岩气的重点勘探方向。

鸽屠宰加工环节金黄色葡萄球菌肠毒素、生物膜形成能力及其相关基因的检测

为了解鸽屠宰加工环节中金黄色葡萄球菌的肠毒素、生物被膜形成能力、肠毒素及生物被膜形成相关基因的情况。采用金黄色葡萄球菌肠毒素酶联免疫分析试剂盒和结晶紫染色法检测41株金黄色葡萄球菌的肠毒素含量和生物被膜形成能力,同时通过PCR方法扩增金黄色葡萄球菌12种肠毒素基因和10种生物被膜形成相关基因。41株金黄色葡萄球菌在肠毒素酶联免疫法检测中,有30株为产肠毒素的菌株。肠毒素基因的检测中,有35株菌含肠毒素基因,检出率为85.36%,且有携带一种或多种肠毒素基因的情况。经典肠毒素基因的检出率分别为:sea(29.27%)、seb(29.27%)、sec(4.88%)、sed(65.85%)和see(2.44%);新型肠毒素基因的检出率分别为:sel(36.59%)、seg(29.27%)、sem(17.07%)、seu(17.07%)、sei(14.63%)、seh(7.32%)和sek(0.00%)。结晶紫染色法测定菌株生物被膜形成能力弱、中等和强的检出率分别为39.02%、43.90%和17.07%。生物被膜形成相关基因的检测中,clfB、luxS和clfA的检出率最高均为100.00%,其次是sarA和ccp均为97.56%,sigB、cna、icaA、agrC的检出率分别为85.37%、65.85%、41.46%、2.44%,bap未检出。此外,所有菌株均有携带多种生物被膜相关基因的情况,以携带7种基因的菌株最多(15/41,36.59%)。鸽屠宰加工环节污染中金黄色葡萄球菌存在较多的肠毒素且生物被膜形成能力较高,预测该鸽屠宰加工环节中金黄色葡萄球菌具有致病性,存在引起食物中毒的潜在风险。