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四川盆地侏罗系凉高山组不同岩性组合页岩油赋存状态及可动性

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石油与天然气地质 2024年第3期45卷 752-769页

作者：方锐蒋裕强杨长城邓海波蒋婵洪海涛唐松谷一凡朱讯孙莎莎蔡光银西南石油大学地球科学与技术学院四川成都610500 中国石油非常规油气重点实验室储层评价实验室四川成都610500 中国石油西南油气田公司气田开发管理部四川成都610056 中国石油西南油气田致密油气勘探开发项目部四川成都610051 中国石油西南油气田公司勘探事业部四川成都610051 中国石油西南油气田公司勘探开发研究院四川成都610041 中国石油西南油气田公司川中油气矿四川遂宁629000 中国石油勘探开发研究院北京100083

通过系统分析钻井取心资料,将四川盆地侏罗系凉高山组页岩细分为纯页岩型组合、介壳型页岩组合和粉砂型页岩组合等3类5种岩性组合,在此基础上,总结不同岩性组合页岩储层宏观、微观特征差异,识别并评价不同岩性组合页岩油储层流体赋存状... 详细信息

通过系统分析钻井取心资料,将四川盆地侏罗系凉高山组页岩细分为纯页岩型组合、介壳型页岩组合和粉砂型页岩组合等3类5种岩性组合,在此基础上,总结不同岩性组合页岩储层宏观、微观特征差异,识别并评价不同岩性组合页岩油储层流体赋存状态特征及可动性,优选有利岩性组合类型。研究表明:①凉高山组页岩油分为游离油和吸附油,游离油具有易流动油和束缚油2种赋存状态,页岩孔隙中,小孔主要赋存吸附油和束缚油,中孔主要赋存束缚油和易流动油,大孔主要为易流动油;二维核磁共振T2≥0.2 ms,1≤T1/T2<10的区域为易流动油以及束缚油信号,T2<0.2 ms,10≤T1/T2<100的区域则为吸附油信号,并建立了凉高山组不同赋存状态流体二维核磁共振T1-T2识别图版;核磁共振孔径转换揭示了凉高山组页岩油游离油孔径下限为60 nm,建立了基于孔径大小和流体赋存状态的页岩油储层孔隙划分方案。②有机质含量、流体流动能力、矿物组成及孔隙结构是凉高山组页岩油赋存及可动性的直接影响因素。③粉砂型页岩组合大孔及微裂缝发育,易流动孔隙占比高,可动油更容易富集;粉砂纹层构造发育不仅能够提供丰富的储集空间,也会提高孔隙连通性,有利于页岩油聚集、赋存及流动,指示了粉砂型页岩组合为凉高山组有利岩性组合类型,其发育层段即为四川盆地凉高山组页岩油勘探开发有利层段。明确粉砂型页岩组合孔-缝配置关系是未来凉高山组页岩油勘探开发取得突破的主要攻关研究方向。

关键词：可动性赋存状态二维核磁共振T1-T2谱岩性组合页岩油凉高山组,四川盆地

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污水中新型冠状病毒监测技术的进展与启示

科学通报 2024年第3期69卷 362-369页

作者：邓妤徐晓庆郑夏婉梁卓伟徐浩光李迎慧扈庆华杨敏黄霞唐宋张岚张彤香港大学土木工程系环境工程研究中心环境微生物组工程与技术实验室中国香港999077 香港大学李嘉诚医学院公共卫生学院中国香港999077 香港特别行政区政府环境保护署中国香港999077 深圳市疾病预防控制中心深圳518055 中国科学院生态环境研究中心北京100085 清华大学环境学院北京100084 中国疾病预防控制中心环境与健康相关产品安全所北京100021

污水流行病学的概念最早于2001年提出[1],最初是通过追踪污水中多种与人群健康和行为相关的化学与生物标记物,对使用毒品与非法药物的群体进行精准溯源[2],或是预警、跟踪和遏制传染病的暴发及其在社区中的传播[3].其中一个典型的应用... 详细信息

污水流行病学的概念最早于2001年提出[1],最初是通过追踪污水中多种与人群健康和行为相关的化学与生物标记物,对使用毒品与非法药物的群体进行精准溯源[2],或是预警、跟踪和遏制传染病的暴发及其在社区中的传播[3].其中一个典型的应用实例是2013年以色列在常规污水监测中发现了被认为已经根除的脊髓灰质炎病毒,随即据此展开大规模疫苗接种从而成功避免了小儿麻痹症在当地的再次暴发.

关键词：脊髓灰质炎病毒生物标记物人群健康污水监测监测技术进展与启示暴发

High performance wide frequency band triboelectric nanogenerator based on multilayer wave superstructure for harvesting vibration energy

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Nano Research 2023年第5期16卷 6933-6939页

作者： song tang Wenxuan Chang Gui Li Jianfeng Sun Yan Du Xindan Hui Qian tang Zhihao Hu Jiaqi Li Jie Chen Wencong He Hengyu Guo School of Physics Chongqing UniversityChongqing 400044China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 400047China

Efficiently converting the random vibration energy widely existed in human activities and natural environments into electricity is significant to the local power supply of sensor nodes in the internet of ***,the conversion efficiency of energy harvester is relatively low due to the limitation of device’s intrinsic *** this work,a multi-layered,wavy super-structuredtriboelectric nanogenerator(SS-TENG)is designed,whose output performances can be greatly promoted by combining the charge excitation *** steel sheet acts not only as an electrode but also as a supporter for the overall frame of SSTENG,which effectively improves the space utilization rate and results in a volume charge density up to 129 mC·m^(−3).In addition,the resonant frequency width of the SS-TENG can be widened by changing the parameters of the *** demonstration,the SS-TENG can sustainably drive two temperature and humidity sensors in parallel by harvesting vibration *** work may provide an effective strategy for harvesting vibration energy and broadening frequency response.

关键词： charge excitation superstructure vibration energy volume charge density resonant frequency

Symbology of Feynman integrals from twistor geometries

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 44-59页

作者： song He Jiahao Liu Yichao tang Qinglin Yang School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China International Centre for Theoretical Physics Asia-Pacific Beijing 100049 Peng Huanwu Center for Fundamental Theory Hefei 230026China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

We study the symbology of planar Feynman integrals in dimensional regularization by considering geometric configurations in momentum twistor space corresponding to their leading singularities(LS). Cutting propagators in momentum twistor space amounts to intersecting lines associated with loop and external dual momenta, including the special line associated with the point at infinity, which breaks dual conformal symmetry. We show that cross-ratios of intersection points on these lines, especially those on the infinity line, naturally produce symbol letters for Feynman integrals in D = 4-2∈, which include and generalize their LS. At one loop, we obtain all symbol letters using intersection points from quadruple cuts for integrals up to pentagon kinematics with two massive corners, which agree perfectly with canonical differential equation(CDE) results. We then obtain all two-loop letters, for up to four-mass box and one-mass pentagon kinematics, by considering more intersections arising from two-loop cuts. Finally we comment on how cluster algebras appear from this construction, and importantly how we may extend the method to non-planar integrals.

关键词： Feynman integrals symbol letters twistor geometry

An artificial interphase enables stable PVDF-based solid-state Li metal batteries

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Nano Research 2024年第3期17卷 1482-1490页

作者： Mengjun Wu Jiangping song Jiaheng Lei Haolin tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Chemistry School of ChemistryChemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China

Composite polymer electrolytes(CPEs)have attracted much attention for high energy density solid-state lithium-metal batteries owing to their flexibility,low cost,and easy ***,the unstable Li/CPE interface is always challengeable for the practical utilization of ***,a polymer interlayer containing K+prepared by ultraviolet(UV)-curing precursor solution is coated on Li surface to stabilize the interface between poly(vinylidene difluoride)(PVDF)composite electrolytes and Li *** from the physical barrier of the interlayer,the continuous decomposition of PVDF is restrained and the intimate contact between electrode and electrolyte is also achieved to reduce the interface ***,the added K+is utilized to further regulate smooth Li *** a consequence,the symmetric Li|Li cell with coated Li demonstrates steady cycling at 0.4 mAh·cm^(-2) and a high critical current density of 1 mA·cm^(-2).The assembled Li|LiFePO_(4) cell presents outstanding cycling stability(capacity retention of 90%after 400 cycles at 1 C)and good rate *** associated pouch cell performs impressive flexibility and *** work provides a convenient strategy to achieve stable Li/PVDF interface for high-performance PVDF-based solid state Li metal batteries.

关键词： interfacial modification solid-state batteries composite polymer electrolytes interfacial compatibility lithium dendrite

532 nm响应增强的AlGaAs光电阴极

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物理学报 2024年第11期73卷 368-376页

作者：王东智张益军李诗曼童泽昊唐嵩石峰焦岗成程宏昌富容国钱芸生曾玉刚南京理工大学电子工程与光电技术学院南京210094 微光夜视技术重点实验室西安710065 中国科学院长春光学精密机械与物理研究所长春130033

AlGaAs光电阴极具有响应速度快和光谱响应范围可调的特性,可被应用于水下光通信领域.为了解决AlGaAs发射层较低的光吸收限制其量子效率提高的问题,利用分布式布拉格反射镜(DBR)结构对特定波长光的反射作用,将透过光重新反射回发射层进... 详细信息

AlGaAs光电阴极具有响应速度快和光谱响应范围可调的特性,可被应用于水下光通信领域.为了解决AlGaAs发射层较低的光吸收限制其量子效率提高的问题,利用分布式布拉格反射镜(DBR)结构对特定波长光的反射作用,将透过光重新反射回发射层进一步提高吸收率,从而增强阴极在532 nm波长处的响应能力.通过求解一维连续性方程,建立了具有DBR结构的AlGaAs光电阴极光谱响应模型.采用时域有限差分法,分析了DBR结构中子层周期对数、子层材料以及发射层、缓冲层厚度对发射层吸收率的影响,对比了有无DBR结构AlGaAs光电阴极的光吸收分布.结果表明,周期对数为20、子层材料为Al_(0.7)Ga_(0.3)As/AlAs的DBR结构对532 nm光的反射效果最优.基于该DBR结构,发射层和缓冲层厚度分别为495 nm和50 nm时,发射层对532 nm光具有最佳吸收率.通过对外延生长的AlGaAs光电阴极进行激活实验,结果表明具有DBR结构的AlGaAs光电阴极在532 nm波长处的光谱响应率相比无DBR结构的AlGaAs光电阴极光谱响应率提升了约1倍.

关键词： AlGaAs光电阴极分布式布拉格反射镜光谱响应光吸收

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The influence of air supply inlet location on the spatial-temporal distribution of bioaerosol in isolation ward under three mixed ventilation modes

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Energy and Built Environment 2023年第4期4卷 445-457页

作者： Zhijian Liu Tianci Wang Yongxin Wang Haiyang Liu Guoqing Cao song tang Department of Power Engineering North China Electric Power UniversityBaodingHebei 071003China Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China

The outbreak of COVID-19 and the spread of infectious pathogens through bioaerosols have once again aroused widespread concern *** ward is an important place to prevent the spread of infectious ***,infection of health care workers(HCWs)in the isolation ward often occurs,so it is ur-gent to carry out relevant research to reduce the cross-infection between HCWs and *** this paper,the temporal and spatial distribution characteristics of bioaerosols under three mixed ventilation modes in a single ward were studied,namely,upper supply side return air of Case 1 and side supply and side return ventilation are Case 2 and Case 3 *** results show that the removal efficiency of bioaerosol in the ventilation mode of Case 3,in which directional airflow is formed from the air supply inlet to the release source and then to the exhaust outlet,is 46.6%and 67.7%higher than that of Case 1 and Case 2,*** addition,ventilation methods based on mixed theory do not guarantee good air quality in the breathing zone(1.3 m to 1.7 m)of HCWs,which may increase the inhalation risk for *** is hoped that our results can provide some useful suggestions for optimizing the airflow layout of the isolation ward,reducing the risk of cross-infection,and virus elimination.

关键词： Bioaerosol Isolation ward Mixed ventilation Breathing zone Computational fluid dynamics

Advantages of nanocarriers for basic research in the field of traumatic brain injury

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Neural Regeneration Research 2024年第2期19卷 237-245页

作者： Xingshuang song Yizhi Zhang Ziyan tang Lina Du School of Pharmaceutical Sciences Shandong University of Traditional Chinese MedicineJinanShandong ProvinceChina Department of Pharmaceutics Beijing Institute of Radiation MedicineBeijingChina

A major challenge for the efficient treatment of traumatic brain injury is the need for therapeutic molecules to cross the blood-brain barrier to enter and accumulate in brain *** overcome this problem,researchers have begun to focus on nanocarriers and other brain-targeting drug delivery *** this review,we summarize the epidemiology,basic pathophysiology,current clinical treatment,the establishment of models,and the evaluation indicators that are commonly used for traumatic brain *** also report the current status of traumatic brain injury when treated with nanocarriers such as liposomes and *** can overcome a variety of key biological barriers,improve drug bioavailability,increase intracellular penetration and retention time,achieve drug enrichment,control drug release,and achieve brain-targeting drug ***,the application of nanocarriers remains in the basic research stage and has yet to be fully translated to the clinic.

关键词： blood-brain barriers brain targeting central nervous system extracellular vesicles inflammatory factor microglial cell nanocarriers nanoparticles neural restoration traumatic brain injury

Grain-boundary segregation and grain growth in nanocrystalline substitutional solid solution alloys

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Journal of Materials Science & Technology 2024年第1期168卷 239-249页

作者： Fawei tang Chao Hou Hao Lu Zhi Zhao Xiaoyan song Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China

A model for describing solute segregation at grain boundaries has been developed for substitutional solid solution alloys,which integrates multiple factors from atomic to microstructural scales.A concept of mo-lar Gibbs free energy of segregation was introduced to evaluate the segregating capability of the solute elements in a closed system,through which the influences of grain boundary structure,grain size,ma-terial composition,and external conditions were *** on the evaluation of various energy forms related to solute segregation and grain growth processes,the nature of the thermal stabilization of nanograin structures by solute segregation was disclosed.A criterion for the destabilization of nanostruc-tures,which is determined by the competition of the change rates between the molar Gibbs free energy of segregation and the total energy of grain boundaries with grain size,has been *** study provided guideline to achieve high-temperature stability of nanograin structures of solid solution alloys even for the weakly segregating nanocrystalline systems.

关键词： Substitutional solid solution Grain boundary segregation Thermal stabilization Solute concentration Grain size