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Distribution and geochemical significance of alkylbenzenes for crude oil with different depositional environments and thermal maturities

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Petroleum Science 2024年第2期21卷 777-790页

作者： Bing-Kun Meng dao-Fu song Yuan Chen Sheng-Bao Shi School of Petroleum Engineering and Environmental Engineering Yan'an UniversityYan'an716000ShaanxiChina State Key Laboratory of Petroleum Resources and Prospecting College of GeosciencesChina University of PetroleumBeijing102249China

A total of 45 alkylbenzenes were detected and identified in crude oils with different depositional environments and thermal maturities from the Tarim Basin,Beibuwan Basin,and songliao Basin using comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry(GC×GCTOFMS).By analyzing the distribution characteristics of C0-C5alkylbenzenes,it is found that the content of some alkylbenzenes varies greatly in crude *** on the distribution characteristics of 1,2,4,5-tetramethylbenzene(Te MB)and 1,2,3,4-Te MB,the ratio of 1,2,4,5-Te MB to 1,2,3,4-Te MB is proposed to indicate the organic matter origin and depositional environment of ancient *** samples originated mainly from lower hydrobiont,algae,bacteria and source rocks deposited under reducing/anoxic conditions have low 1,2,4,5-/1,2,3,4-Te MB values(less than 0.6),while oil samples originated mainly from terrestrial higher plants and source rocks deposited under oxic/sub-oxic conditions have higher 1,2,4,5-/1,2,3,4-Te MB values(greater than 1.0).The significant difference of 1,2,4,5-/1,2,3,4-Te MB values is controlled by 1,2,4,5-Te MB content.1,2,4,5-Te MB content in oils derived from source rocks deposited in oxidized sedimentary environment(greater than 1.0 mg/g whole oil)is higher than that in oils from source rocks deposited in reduced sedimentary environment(less than 1.0 mg/g whole oil).1,2,4,5-/1,2,3,4-Te MB ratio might not or slightly be affected by evaporative fractionation,biodegradation and thermal maturity.1,2,4,5-/1,2,3,4-Te MB ratio and 1,2,4,5-Te MB content can be used as supplementary parameter for the identification of sedimentary environment and organic matter *** should be noted that compared to the identification of organic matter sources,the 1,2,4,5-/1,2,3,4-Te MB parameter is more effective in identifying sedimentary environments.

关键词： 1 2 4 5-Tetramethylbenzene GC×GC-TOFMS Organic matter origin Depositional environment

Gut microbiota-dependent phenylacetylglutamine in cardiovascular disease:current knowledge and new insights

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Frontiers of Medicine 2024年第1期18卷 31-45页

作者： Yaonan song Haoran Wei Zhitong Zhou Huiqing Wang Weijian Hang Junfang Wu dao Wen Wang Division of Cardiology Department of Internal MedicineTongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders Wuhan430030China

Phenylacetylglutamine(PAGln)is an amino acid derivate that comes from the amino acid *** are increasing studies showing that the level of PAGln is associated with the risk of different cardiovascular *** this review,we discussed the metabolic pathway of PAGln production and the quantitative measurement methods of *** summarized the epidemiological evidence to show the role of PAGln in diagnostic and prognostic value in several cardiovascular diseases,such as heart failure,coronary heart disease/atherosclerosis,and cardiac *** underlying mechanism of PAGln is now considered to be related to the thrombotic potential of platelets via adrenergic ***,other possible mechanisms such as inflammatory response and oxidative stress could also be induced by ***,since PAGln is produced across different organs including the intestine,liver,and kidney,the cross-talk among multiple organs focused on the function of this uremic toxic ***,the prognostic value of PAGln compared to the classical biomarker was discussed and we also highlighted important gaps in knowledge and areas requiring future investigation of PAGln in cardiovascular diseases.

关键词： PAGln cardiovascular disease gut microbiota uremic metabolite biomarker

High Speed Sintering:Assessing the Influence of Energy Input on Microstructure and Mechanical Properties of Polyether Block Amide(PEBA)Parts

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Chinese Journal of Polymer Science 2024年第5期42卷 675-682,I0004,I0010页

作者： Jiang-Tao Sun Zhi-Yong Fan Yi-Wei Mao Wei Li Wei Zhu dao-Sheng Cai Qing-song Wei State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430074China National Engineering Research Centre for High Efficiency Grinding Hunan UniversityChangsha410082China Wuhan EasyMFG Technology CO. LTDWuhan430074China

High speed sintering,a new powder-bed fusion additive manufacturing technology,utilizes infrared lights(IR)to intensely heat and melt polymer *** presence of defects such as porosity,which is associated with particle coalescence,is highly dependdent on the level of energy *** study investigate the influcence of energy input on porosity and its subsequent effects on the mechanical properties and microstructures of PEBA *** parts were manufactured with a variety of lamp powers,resulting in a range of energy input levels spanning from low to ***,they underwent testing using Archimedes’method,followed by tensile *** porosity,mechanical characteristics,and energy input exhibit a strong correlation;inadequate energy input was the primary cause of pore *** the reduced IR light power resulted in the following outcomes:porosity,ultimate tensile strength,and elongation of 1.37%,7.6 MPa,and 194.2%,*** the energy input was further increased,the porosity was reduced to as low as 0.05%and the ultimate tensile strength and elongation were increased to their peak values of 233.8%and 9.1 MPa,respectively.

关键词： High speed sintering Additive manufacturing Energy input Powder bed fusion PEBA

Innovative coaxial high-temperature thin-film sensor with core-shell structure surpassing traditional multilayer films

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Rare Metals 2024年第8期43卷 3854-3867页

作者： Chao Wu Guo-Chun Chen Fu-Xin Zhao Fan Lin Ying-Jun Zeng Yan-Zhang Fu Yan-song Zhang Li-Da Xu Qin-Nan Chen Rui Tang dao-Heng Sun Zhen-Yin Hai Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China AECC Shenyang Engine Institute Shenyang 110015China School of Aerospace Engineering Xiamen UniversityXiamen 361005China

High-temperature thin-film sensors(TFSs)often suffer from inadequate tolerance to elevated *** this study,an innovative approach is presented to fabricate in situ integrated TFSs with a core-shell structure on alloy components using coaxial multi-ink printing *** method replaces traditional layerby-layer(LbL) deposition and LbL sintering processes and achieves simplified one-step *** coaxial TFS includes a conductive Pt core for conducting and sensing and a dielectric shell for electrical isolation and high-temperature *** coaxial Pt resistance grid demonstrates excellent high-temperature stability,with a resistance drift rate of only 0.08%·h^(-1) at 800 ℃,significantly lower than traditional Pt *** employing this method,a Pt thin-film strain gauge(TFSG) is fabricated that boasts remarkable high-temperature electromechanical *** effectively addresses the problem of sensitivity degradation experienced by traditional LbL Pt TFSGs when subjected to high *** demonstrate the system integration potential of the technique by printing and verifying the functionality of a long-path thinfilm resistance grid on turbine blades,which can withstand butane flame up to ~1300℃.These results showcase the potential of core-shell structure of the coaxial TFS for high-temperature applications,providing a novel approach to develop high-performance TFS beyond traditional multilayer structure.

关键词： Coaxial printing Core-shell structure Thinfilm strain gauge High-temperature stability

猴痘病毒相关蛋白A42R的生物信息学及分子对接分析

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中国病原生物学杂志 2024年第1期19卷 1-9页

作者：王道刘文彬宋甜中南大学湘雅二医院妇产科湖南长沙410011 湖南师范大学生命科学学院

目的通过生物信息学及分子对接分析以了解猴痘病毒(monkeypox virus, MPXV)相关蛋白A42R的结构特征、抗原表位以及小分子抑制物。方法利用生物信息学和分子对接技术对MPXV A42R蛋白的开放阅读框、蛋白同源性、理化性质、翻译后修饰位... 详细信息

目的通过生物信息学及分子对接分析以了解猴痘病毒(monkeypox virus, MPXV)相关蛋白A42R的结构特征、抗原表位以及小分子抑制物。方法利用生物信息学和分子对接技术对MPXV A42R蛋白的开放阅读框、蛋白同源性、理化性质、翻译后修饰位点、二级/三级结构、B/T细胞抗原表位、配体结合位点以及小分子化合物等进行预测分析。结果 A42R蛋白由133个氨基酸组成,分子质量为15.003 42 ku,理论等电点9.36。该蛋白与天花病毒、骆驼痘病毒、痘苗病毒、牛痘病毒的序列一致性高,而且与天花病毒有最近的共同祖先。A42R蛋白以不规则卷曲为主要结构,属于亲水性蛋白;含有2个O-糖基化位点、1个N-糖基化位点和14个磷酸化位点;含有5个B细胞抗原表位,23个CLT细胞抗原表位,16个Th细胞抗原表位,6个抗原决定簇;含有8个可能的配体结合区,10个潜在的分子化合物。结论 A42R为亲水性蛋白,含有丰富的B、T细胞抗原表位和配体结合区,可为抗猴痘病毒药物和疫苗的设计与开发提供参考。

关键词：猴痘病毒 A42R蛋白生物信息学分子结构抗原表位

响应面法优化暗紫贝母流浸膏提取工艺及其质量评价

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天然产物研究与开发 2024年第9期36卷 1554-1563页

作者：张亚梅韩鸿萍宋道光青海师范大学化学化工学院西宁810008 青海省青藏高原药用动植物资源重点实验室西宁810016

优化暗紫贝母流浸膏提取工艺,评价暗紫贝母流浸膏质量。以总生物碱含量、贝母辛含量、贝母素甲、贝母素乙和西贝母碱三碱含量之和、浸膏得率的综合评分作为评价指标,采用单因素实验确定乙醇体积分数、乙醇用量、浸润时间、渗漉速度4个... 详细信息

优化暗紫贝母流浸膏提取工艺,评价暗紫贝母流浸膏质量。以总生物碱含量、贝母辛含量、贝母素甲、贝母素乙和西贝母碱三碱含量之和、浸膏得率的综合评分作为评价指标,采用单因素实验确定乙醇体积分数、乙醇用量、浸润时间、渗漉速度4个因素对暗紫贝母流浸膏提取的影响;利用Box-Benhnken响应面法确定并验证暗紫贝母流浸膏的最优渗漉提取工艺条件;采用薄层色谱法对暗紫贝母药材进行定性鉴别,并对其水分、灰分及浸出物进行检查;采用薄层色谱建立暗紫贝母流浸膏中贝母辛、贝母素乙的定性鉴别方法,并对其乙醇量和重金属进行检查。结果表明暗紫贝母流浸膏的最佳提取工艺为:乙醇体积分数为70%,乙醇用量为18倍,浸润时间为39 h,渗漉速度为3 mL/(kg·min),在此条件下暗紫贝母流浸膏综合评分为(89.97±1.90)%。药材和流浸膏TLC结果斑点清晰,分离度好,药材水分不超过15%、灰分不超过5.0%及浸出物大于9.0%,暗紫贝母流浸膏的乙醇量和重金属检查均符合《中华人民共和国药典》流浸膏制剂规定。本研究优化的暗紫贝母流浸膏提取工艺稳定可行,为暗紫贝母开发利用提供参考。

关键词：暗紫贝母流浸膏响应面提取工艺质量评价

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KJ-630高韧性环氧树脂固化剂的合成

粘接 2017年第8期38卷 45-47,25页

作者：宋道理章劲松谢跃辉周建民长沙市化工研究所湖南长沙410007

采用多支链化合物改性苯酚(HBMP),通过曼尼希反应合成一种高韧性酚醛胺类环氧树脂固化剂。通过对其合成工艺、产物性能和固化性能的深入研究发现,该固化剂可大幅提高固化体系的韧性,获得了极佳的使用性能。

关键词：多支链改性苯酚曼尼希反应酚醛胺高韧性:环氧固化剂

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采区水仓快速综掘施工技术与研究

山东煤炭科技 2024年第5期42卷 63-67页

作者：宋道河南龙宇能源股份有限公司陈四楼煤矿河南永城476600

为确保陈四楼煤矿采区接替平稳过渡,需要加快十八采区水仓施工进度尽快完成采区永久排水系统,以便为后续回采巷道正常进行掘进提供安全保障。十八采区水仓由于受水仓容量和泵房位置的限制,需要多次连续拐弯施工。为加快巷道施工进度同... 详细信息

为确保陈四楼煤矿采区接替平稳过渡,需要加快十八采区水仓施工进度尽快完成采区永久排水系统,以便为后续回采巷道正常进行掘进提供安全保障。十八采区水仓由于受水仓容量和泵房位置的限制,需要多次连续拐弯施工。为加快巷道施工进度同时解决水仓连续大角度拐弯无法实现连续出矸的难题,陈四楼煤矿尝试采用“综掘机+耙装机+胶带输送机”连续出矸方案,通过不断尝试和优化形成了陈四楼煤矿采区水仓快速综掘施工技术体系,平均月单进达120 m以上。结合陈四楼煤矿十八采区水仓施工过程,从工程设计、设备选型、施工方法等方面详细介绍了采区水仓快速综掘施工技术体系,为以后相似工程提供了技术参考。

关键词：采区水仓快速综掘施工连续出矸

基于观测器和指定性能的非线性系统事件触发跟踪控制

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自动化学报 2024年第9期50卷 1747-1760页

作者：游星星杨道文郭斌刘凯佃松宜朱雨琪四川大学电气工程学院成都610065 四川大学&瀚维智能机器人感知与控制联合实验室成都610065

针对一类具有外部扰动的非线性系统,提出了一种自适应模糊跟踪控制方法.首先,利用模糊逻辑系统逼近系统未知的非线性函数,并设计了一个模糊状态观测器来估计系统的不可测状态.其次,通过指定性能函数,使系统的跟踪误差能够约束在指定范围... 详细信息

针对一类具有外部扰动的非线性系统,提出了一种自适应模糊跟踪控制方法.首先,利用模糊逻辑系统逼近系统未知的非线性函数,并设计了一个模糊状态观测器来估计系统的不可测状态.其次,通过指定性能函数,使系统的跟踪误差能够约束在指定范围内.然后,利用Backsteping方法结合包含对数函数的Lyapunov泛函,设计了一个基于事件触发条件的自适应模糊控制器.基于Lyapunov稳定性理论和信号是半全局一致最终有界的.最后,通过一个数值仿真例子验证了所提出方法的有效性.

关键词：自适应控制指定性能事件触发模糊逻辑系统模糊观测器

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