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关键词： 流体包裹体   成矿阶段   氢-氧同位素   矿床成因   好力宝矿床  

摘要： 好力宝矿床位于西拉木伦成矿带东部,为斑岩型铜钼矿床。矿体主要赋存于斜长花岗斑岩的角砾岩带中,与斜长花岗斑岩关系密切,成矿作用划分为3个阶段:石英-黄铜矿-黄铁矿-辉钼矿阶段(Ⅰ)、黄铁矿-方铅矿-闪锌矿-辉钼矿-石英脉阶段(Ⅱ)、石英-方解石-萤石阶段(Ⅲ)。流体包裹体测试结果表明:流体包裹体主要为气液两相包裹体(L型)、含CO 2包裹体(C型)和纯CO 2包裹体(PC型)。成矿Ⅰ阶段主要包括L型、C型和PC型流体包裹体,为典型的高温(集中在380.0℃~400.0℃)、中低盐度(集中在7.50%~8.50%)的CO2-NaCl-H2O体系;成矿Ⅱ阶段主要包括L型和C型流体包裹体,属于高温(集中在330.0℃~350.0℃)、低盐度(集中在4.25%~5.00%)的CO2-NaCl-H2O体系;成矿Ⅲ阶段仅包括L型流体包裹体,属于中低温(集中在280.0℃~300.0℃)、低盐度(集中在2.00%~2.75%)的NaCl-H2O体系。氢-氧同位素测试结果显示,δD V-SMOW为-115.8‰~-94.5‰,δ18O H2O为-8.32‰~0.28‰,暗示成矿流体主要来源于岩浆,含有少量大气降水。研究结果表明,该矿床成矿流体为中高温、中低盐度流体,流体不混溶促使金属矿物发生沉淀富集。

关键词： 细胞力学   粘附力   表面张力   弹性模量   肿瘤诊疗  

摘要： 概述了2020年细胞力学研究的热点和进展,探讨了细胞膜表面张力、细胞粘附力、细胞弹性模量、细胞与纳米颗粒相对刚度等对细胞生物学行为的影响及其在疾病诊疗中的应用。

关键词： 心脏外科   动脉采血   血气分析   方法比较  

摘要： 目的比较心脏外科术后利用患者动脉测压管进行动脉采血的两种方法,为临床动脉采血提供理论指导。方法采用临床对照研究,选取2018年4月—9月符合标准的474例患者作为研究对象,按照随机数字表法随机分为钢针组和无针组。比较两组操作血气分析的准确性,具体操作时间,针刺伤发生例数及护士对两种方法的满意度。结果无针组血气分析的准确率为98.37%,钢针组血气分析的准确率为86.88%,P>0.05,差异无统计学意义。无针组的操作时间为(159.53±12.168)s,钢针组的操作时间为(175.50±13.321)s;钢针组针刺伤的发生例数为42;本科护士对无针置入法满意度明显高于钢针组,差异均有统计学意义,P<0.05。结论心脏外科术后利用患者动脉测压管进行动脉采血,无针采血法较钢针采血法,缩短了操作时间、减少了针刺伤的发生,护士满意度明显提高。

关键词： 钨   级联碰撞   分子动力学   原子间相互作用势函数  

摘要： 原子间相互作用势函数的精确性会影响分子动力学级联碰撞模拟结果的精确性。本文选取5种典型的金属钨势函数进行比较测试,通过分子动力学方法,用能量为10 keV和50 keV的初级碰撞原子进行级联碰撞模拟,讨论和分析了辐照过程中缺陷的产生、缺陷团簇和位错环的分布。结果表明:对于最终稳定状态下的弗兰克尔对的数目,不同势函数的模拟结果没有明显差别,而对于缺陷的空间分布、缺陷团簇分数及位错环的分布,不同势函数的模拟结果各有特点。本文结果为用于辐照级联模拟势函数的选择提供了参考,也为钨基势函数的进一步优化提供了指导。

关键词： Doppler ultrasound   Deep Neural Networks (DNNs)   Fast Fourier Transform (FFT)   S-shaped riser   Machine Learning (ML)   Twin-window Feature Extraction (TFE)  

摘要： The problem of predicting the regime of a two-phase flow is considered. An approach is proposed that classifies the flow regime using Deep Neural Networks (DNNs) operating on features extracted from Doppler ultrasonic signals of the flow using the Fast Fourier Transform (FFT) is proposed. The features extracted are categorised into one of the four flow regime classes: the annular, churn, slug, and bubbly flow regimes. The scheme was tested on signals from an experimental facility. To increase the number of samples without losing key classification information, this paper proposes a Twin-window Feature Extraction (TFE) technique. To further distinguish the performance of the proposed approach, the classifier was compared to four conventional machine learning classifiers: namely, the AdaBoost classifier, bagging classifier, extra trees classifier, and decision tree classifier. Using the TFE features, the DNNs classifier achieved a higher recognition accuracy of 99.01% and greater robustness for the overfitting challenge, thereby showing the superiority of the DNNs in flow regime classification when compared to the four conventional machine-learning classifiers, which had classification accuracies of 55.35%, 86.21%, 82.41%, and 80.03%, respectively. This approach demonstrates the application of DNNs for flow regime classification in chemical and petroleum engineering fields, using a clamp-on Doppler ultrasonic sensor. This appears to be the first known successful attempt to identify gas-liquid flow regimes in an S-shaped riser using Continuous Wave Doppler Ultrasound (CWDU) and DNNs.

关键词： extended finite element method   crack   three-dimensional calculation   cracking potential function   tensile failure  

摘要： In the finite element method,the numerical simulation of three-dimensional crack propagation is relatively rare,and it is often realized by commercial *** addition to the geometric complexity,the determination of the cracking direction constitutes a great *** most cases,the local stress state provides the fundamental criterion to judge the presence of cracks and the direction of crack ***,in the case of three-dimensional analysis,the coordination relationship between grid elements due to occurrence of cracks becomes a difficult problem for this *** this paper,based on the extended finite element method,the stress-related function field is introduced into the calculation domain,and then the boundary value problem of the function is ***,the envelope surface of all propagation directions can be obtained at one *** last,the possible surface can be selected as the direction of crack *** on the aforementioned procedure,such method greatly reduces the programming complexity of tracking the crack *** a suitable method for simulating tension-induced failure,it can simulate multiple cracks simultaneously.

关键词： CO_2增黏剂   表面张力   低渗透油藏  

摘要： 我国大多数油田属于低渗透性油田,其孔隙度和渗透率都较低,大幅度提升原油采收率相当困难,CO2虽能够有效提高其采收率,但CO2黏度小,极易发生黏性指进和气体窜逸,CO2增黏剂的加入可以有效抑制气体窜逸的发生。为了研究CO2增黏剂在不同压力下对CO2/原油表面张力的影响,本文通过悬滴法测试CO2/原油两相表面张力。结果表明,CO2增黏剂对CO2/原油混合体系的表面张力无影响。但CO2/原油两相间的表面张力与压力却呈现良好的线性关系,证明CO2分子在油滴表面的吸附及排布是造成两相表面张力降低的直接原因。

关键词： 函数导数   高考试题   源与流  

摘要： 许多高三质检试题源于高考试题的改编,本文以一道高三质检函数导数试题为例,进行多解探究,并对其进行“源与流”的探索,引领高考复习.

关键词： Reed black liquor (RBL)   Pyrolysis   Fluidized bed   Calcium-based zeolite   Alkali recovery  

摘要： Fluidized bed pyrolysis is a promising technology for recovering value from reed black liquor (RBL) but it can be limited by agglomeration of the bed material and loss of fluidization. To address this challenge, laboratory experiments examined the continuous, fluidized bed pyrolysis of RBL using two different bed materials at temperatures ranging from 530 to 780 degrees C. Pyrolysis with silica sand as the bed material showed sintering within 120 s and loss of fluidization at a bed temperature of 680 degrees C. Pyrolysis with calcium-based zeolite as the bed material retained fluidization for the entire test period of 30 min at all temperatures examined. Increasing pyrolysis temperature with the calcium-based zeolite increased H-2 generation and decreased tar production, with the highest temperature examined (780 degrees C) providing the best performance. Fluidized bed combustion of the pyrolysis char (both at 780 degrees C) recovered 87% of the sodium in the RBL. Pyrolysis of RBL using fluidized bed technology with a calcium-based zeolite bed material is feasible and effective.

关键词： 流体特征   液化潜势   沉积环境   离岸风电   火花式放电震测   彰滨外海  

摘要： 彰滨外海离岸风场区地质环境可能易产生沉积物液化与流体化作用，若能有效掌握地层特性及流体特征，将有助于离岸工程的建设。本研究透过海洋地质及地球物理方法，发展及应用高解析火花式放电反射震测技术，结合海、陆域地质岩心资料，针对彰滨外海浅部地层特性及流体特征进行探讨，并评估可能的液化潜势。针对单频道高解析震测资料，除运用常规处理方法，亦针对资料中的复反射、涌浪效应、振幅变化不均等问题，应用进阶处理技术进行处理，与一般彰滨外海的已发表资料相比，资料品质获得大幅度改善，可提升对地层分析及流体特征的辨识效率与可信度。利用震测相分析，根据外部形貌差异将流体特征分为垂直移栖型与水平富集型，再以内部特征将垂直移栖型细分为P1(反极性)、P2(极性正常)、P3(连结麻坑)型；而水平富集型又可分为H1(楔型状)、H2(透镜状)、H3(平板状)型。P1、P2型密集分布于古、今浊水溪出海口，推测其形成机制与浊水溪快速沉积作用有关，P3型数量少，零星分布于彰滨外海，三者皆移栖至近海床地层，故形成年代近今。水平富集型皆呈东北-西南向分布，其中H1、H2型位于古浊水溪口外，其分布地层推测为古浊水溪快速沉积事件下，分别由砂所形成的楔型体与远端细粒沉积物形成的沉积体，H3型离岸较远，其位于东彰云沙脊发育区。透过海水面变化及岩心定年资料对比，H2、H3型应在6~4.5 ka之远滨沉积环境中所形成，而H1型则在4.5 ka至现今之三角洲潮盆环境中发育。进一步将所辨识出的不同类型流体分布与地工分析方法所建立的液化潜势结果比对。结果显示，垂直移栖型多位于低液化潜势区；水平富集型则多位于高液化潜势区，指出两种主要流体特征，分别反应液化作用发生前后的结果。本研究认为地物技术所辨认出的流体特征结合地工分析之液化潜势结果有其一致性，若能结合地物方式的大范围调查优势，先建立出地质模型，再以少量精准的地工分析加以验证，对于离岸风电场址的评估效率及成本应有正面之帮助。