检索结果-南通市图书馆

Characteristics and origin of low-organicmatter carbonate source rocks in the Middle-Upper Ordovician, Tarim Basin, northwestern China

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2024年第3期13卷 594-619页

作者： Jun-Qing Chen Fu-Jie Jiang xiong-Qi Pang Hai-Jun yang Kan-Yuan Shi Bo Pang Hong Pang Jian-fa Chen Zhuo-Heng Chen Xin-Gang Zhang Song Wu State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China Basic Research Center for Energy Interdisciplinary College of ScienceChina University of Petroleum(Beijing)Beijing 102249China Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Research Institute of Petroleum Exploration and Development PetroChina Tarim Oilfield CompanyKorla 841000Xinjiang Uygur Autonomous RegionChina Geological Survey of Canada Natural Resources CanadaCalgary T2L 2A7Canada

The continually-discovered large volumes of marine hydrocarbons indicate a huge exploration potential within the carbonate rocks of Ordovician in the Tarim Basin,northwestern *** Middle-Upper Ordovician(O2+3)carbonate source rocks are at a highly mature *** rocks presently contain a low amount of total organic carbon(TOC_(pd)≤0.5%)(TOC_(pd) means the present-day TOC).A mass balance approach is used to identify the source rocks that have expelled *** characteristics and origin of hydrocarbon expulsion from low-TOC_(pd) source rocks are studied,which are significant for oil exploration in the *** results showed that a low-TOC_(pd) O2+3 source rock having expelled hydrocarbons was type I and had a very narrow oil *** a high rock maturity and a high original TOC(TOCo)value exceeding 1%,nearly 80%of the generated hydrocarbons were *** content of gammacerane and C28 steranes in the oil and source rock extracts were relatively lean,with a V-shaped distribution of regular steranes,suggesting a possible genetic relation between the low-TOC_(pd) source rocks and the marine oil in the Tabei *** planktonic algae or acritarchs were the main hydrocarbon parent materials,distributed in the subsiding platform-slope *** matter was preserved under reducing conditions,and source rocks were formed with a favorable kerogen type and a moderate hydrocarbon generation *** study illustrates the hydrocarbon expulsion of low TOC_(pd) source rocks in northern Tarim Basin,which is greatly significant for analyzing the genesis of marine crude oil in Tarim Basin,and evaluating the distribution of marine source *** research method is theoretically significant for oil and gas exploration in the same type of highlymature carbonate paleobasins.

关键词： Carbonate source rock Mass balance approach Present-day TOC Genesis mechanism Tarim Basin

Synergistic Promotion of Electrical, Mechanical and Thermal Properties for Silicone Rubber-based Field Grading Material via Compound Modification

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第1期10卷 337-350页

作者： Jiale Wu yangzhi Gong Peiqi xiong Zexi Xing Xiaofeng Xue Xiao yang Boyang Shen Xingming Bian State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University102206 BeijingChina State Grid Fuzhou Electric Power Supply Company Fuzhou 350009Fujian ProvinceChina Electrical Engineering Division University of CambridgeCambridge CB30FAUK

Use of nonlinearconductive SiC/silicone rubber(SR)field grading material(FGM)can improve the local field concentration of composite *** large volume fraction and large-size SiC particles(SiCp)into SR can obtain a good field grading effect,but it is accompanied by the deterioration of mechanical *** SiC with different shapes can solve this *** incorporating one-dimensional SiC whiskers(SiCw)to synergize with granular SiCp,SiC/SR FGM with better field-dependent conductivity,mechanical properties and thermal conductivity than large-size SiCp and large volume fraction filling case can be obtained by using smaller size SiCp and lower filling *** simulations of 500 kv line insulators show that the modified SiC/SR FGM can reduce the maximum field strength along the insulator surface and at sheath-core rod interfaces by 55%and 71.4%,*** combined application of FGM and grading ring can achieve a complementary *** FGM to partially replace the role of the grading rings,the field strength indicators can still meet the operational requirements after the tube radius and shielding depth of the grading rings at both ends are reduced by 36.2%and 40%separately,which is a benefit to alleviating the problems of high weight and large volume faced by traditional field grading methods.

关键词： Compound modification electric field regulation field grading material field-dependent conductivity mechanical properties thermal conductivity

Interaction between systemic iron parameters and left ventricular structure and function in the preserved ejection fraction population:a two-sample bidirectional Mendelian randomization study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2024年第1期21卷 64-80页

作者： xiong-Bin MA Yong-Ming LIU Yan-Lin LV Lin QIAN The First Clinical Medical College of Lanzhou University LanzhouGansuChina Geriatric Cardiovascular Department and Gansu Clinical Research Center for Geriatric Diseases First Hospital of Lanzhou UniversityGansuChina

BACKGROUND Left ventricular(LV)remodeling and diastolic function in people with heart failure(HF)are correlated with iron status;however,the causality is *** Mendelian randomization(MR)study investigated the bidirectional causal relationship between systemic iron parameters and LV structure and function in a preserved ejection fraction *** Transferrin saturation(TSAT),total iron binding capacity(TIBC),and serum iron and ferritin levels were extracted as instrumental variables for iron parameters from meta-analyses of public genome-wide association *** without myocardial infarction history,HF,or LV ejection fraction(LVEF)<50%(n=16,923)in the UK Biobank Cardiovascular Magnetic Resonance Imaging Study constituted the outcome *** dataset included LV end-diastolic volume,LV endsystolic volume,LV mass(LVM),and LVM-to-end-diastolic volume ratio(LVMVR).We used a two-sample bidirectional MR study with inverse variance weighting(IVW)as the primary analysis method and estimation methods using different algorithms to improve the robustness of the *** In the IVW analysis,one standard deviation(SD)increased in TSAT significantly correlated with decreased LVMVR(β=-0.1365;95%confidence interval[CI]:-0.2092 to-0.0638;P=0.0002)after Bonferroni ***,no significant relationships were observed between other iron and LV *** Bonferroni correction,reverse MR analysis showed that one SD increase in LVEF significantly correlated with decreased TSAT(β=-0.0699;95%CI:-0.1087 to-0.0311;P=0.0004).No heterogeneity or pleiotropic effects evidence was observed in the *** We demonstrated a causal relationship between TSAT and LV remodeling and function in a preserved ejection fraction population.

关键词： fraction function parameters

在线全文

学校读者我要写书评

暂无评论

阴离子树脂分离橄榄苦苷的过程及性能研究

天然产物研究与开发 2024年第3期36卷 512-519,477页

作者：徐锋曾小成吴学文张有发熊艳湘潭大学化工学院湘潭411105 湖南杰萃生物技术有限公司湘潭412007

目前橄榄苦苷的分离、纯化研究主要集中在大孔吸附树脂,但鲜有阴离子树脂分离、纯化橄榄苦苷的报道。为了研究阴离子树脂(LX-68M)吸附、分离过程及性能,采用吸附动力学及等温吸附模型来研究阴离子树脂静态吸附、解吸橄榄苦苷的行为。结... 详细信息

目前橄榄苦苷的分离、纯化研究主要集中在大孔吸附树脂,但鲜有阴离子树脂分离、纯化橄榄苦苷的报道。为了研究阴离子树脂(LX-68M)吸附、分离过程及性能,采用吸附动力学及等温吸附模型来研究阴离子树脂静态吸附、解吸橄榄苦苷的行为。结果表明阴离子树脂对橄榄苦苷的吸附符合准二级动力学模型(R^(2)=0.9934),Freundlich等温吸附模型(R^(2)=0.9642)。进一步通过动态实验优化阴离子树脂纯化橄榄苦苷工艺,最佳操作工艺为:上样浓度为0.25 g/mL,解吸液为45%乙醇,吸附、解吸速率均为2.0 BV/h。该条件下橄榄苦苷的吸附率、解吸率分别为86.86%、87.08%,纯度为52.33%。此外,阴离子树脂重复使用4次后吸附率为54.9%,经再生处理后,吸附率恢复到93.51%,表明其具有一定的工业化前景。阴离子树脂稳定性好、分离条件温和,适合用于橄榄苦苷及其他相似天然产物的分离纯化。

关键词：橄榄苦苷阴离子树脂吸附动力学等温吸附行为分离

Open surgical treatment of choledochocele: A case report and review of literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2018年第14期6卷 842-846页

作者： Jie yang Guang-fa Xiao Yi-xiong Li Department of Biliopancreatic Surgery Xiangya Hospital Central South University

Choledochocele （also known as type？Ⅲ？ choledochal cyst according to Todani’s classifcation） is a cystic dilation of the distal segment of the common bile duct protru-ding into the duodenal lumen. Cases are rare and the etiology remains unclear. It is usually misdiagnosed as peptic ulcer, as in the patient whose case is described here. Multislice spiral computed tomography and magnetic resonance cholangiopancreatography may be comparable to endoscopic retrograde cholangiogra-phy for diagnosis of choledochocele. Both endoscopic therapy and open surgical management are safe options, and size of the cyst plays a role in the decision-making for which approach to apply. A 50-year-old woman admitted to our hospital with upper abdominal pain caused by choledochocele with large size was successfully treated by open surgical management. We present the details of her case in this case report and discuss the recent literature on such cases and their therapeutic management.

关键词： Choledochal cyst Endoscopic retrograde cholangiopancreatography Choledochocele Operative surgical procedure Case report

Reduction of entropy uncertainty for qutrit system under non-Markov noisy environment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第4期29卷 165-171页

作者： xiong Xu Mao-fa fang Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China

We explore the entropy uncertainty for qutrit system under non-Markov noisy environment and discuss the effects of the quantum memory system and the spontaneously generated interference(SGI)on the entropy uncertainty in *** results show that,the entropy uncertainty can be reduced by using the methods of quantum memory system and adjusting of ***,the entropy uncertainty can be decreased obviously when both the quantum memory system and the SGI are simultaneously applied.

关键词： entropy uncertainty relation non-Markov noisy qutrit and spontaneously generated interference

新发展阶段推进民族地区共同富裕的梗阻及纾解

在线全文

学校读者我要写书评

暂无评论

前沿 2024年第2期 58-70页

作者：黄德雄梁发右贵州师范大学马克思主义学院贵州贵阳550001 右江民族医学院马克思主义学院广西百色533000 广东理工学院马克思主义学院广东肇庆526100

共同富裕是社会主义的本质要求,是中国式现代化的重要特征,也是党和国家长期坚持的战略目标。民族地区是扎实推进共同富裕的重要场域,推进民族地区共同富裕是铸牢中华民族共同体意识的物质保障,更是以中国式现代化推进中华民族伟大复兴... 详细信息

共同富裕是社会主义的本质要求,是中国式现代化的重要特征,也是党和国家长期坚持的战略目标。民族地区是扎实推进共同富裕的重要场域,推进民族地区共同富裕是铸牢中华民族共同体意识的物质保障,更是以中国式现代化推进中华民族伟大复兴的现实之需。当前,扎实推进民族地区共同富裕仍然面临经济发展水平有待提高、收入水平较低且城乡差距较大、生态环境保护形势严峻及生态产品价值未能充分体现、基本公共服务设施与能力不足等问题,部分群众依然存在返贫风险。为此,新发展阶段推进民族地区共同富裕要坚持党的全面领导、实现经济高质量发展、多方联动完善三次收入分配方式、统筹协调推进以生态优先绿色发展为导向的高质量发展、提升基本公共服务均等化水平、坚持绿色发展理念,促进人与自然和谐共生,强化精神生活共同富裕,以期推动民族地区共同富裕取得更加明显的实质性进展。

关键词：中国式现代化民族工作高质量发展共同富裕各民族交往交流交融

Dynamics of entropic uncertainty for three types of three-level atomic systems under the random telegraph noise

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第5期29卷 459-463页

We study the dynamics of the entropic uncertainty for three types of three-level atomic systems coupled to an environment modeled by random matrices. The results show that the entropic uncertainty in the Ξ-type atomic system is lower than that in the V-type atomic system which is exactly the same as that in the Λ-type atomic system. In addition, the effect of relative coupling strength on entropic uncertainty is opposite in Markov region and non-Markov region, and the influence of a common environment and independent environments in Markov region and non-Markov region is also opposite. One can reduce the entropic uncertainty by decreasing relative coupling strength or placing the system in two separate environments in the Markov case. In the non-Markov case, the entropic uncertainty can be reduced by increasing the relative coupling strength or by placing the system in a common environment.

关键词： entropic uncertainty three-level atom random telegraph noise

Model-constrained and data-driven double-supervision acoustic impedance inversion

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第5期20卷 2809-2821页

作者： Dong-Feng Zhao Na-Xia yang Jin-Liang xiong Guo-fa Li Shu-Wen Guo State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Dagang Oil Field PetroChinaTianjin300280China Research Institute of Exploration and Development Dagang Oil FieldPetroChinaTianjin300280China

Seismic impedance inversion is an important technique for structure identification and reservoir ***-based and data-driven impedance inversion are the commonly used inversion *** practice,the geophysical inversion problem is essentially an ill-posedness problem,which means that there are many solutions corresponding to the same seismic ***,regularization schemes,which can provide stable and unique inversion results to some extent,have been introduced into the objective function as constrain *** them,given a low-frequency initial impedance model is the most commonly used regularization method,which can provide a smooth and stable ***,this model-based inversion method relies heavily on the initial model and the inversion result is band limited to the effective frequency bandwidth of seismic data,which cannot effectively improve the seismic vertical resolution and is difficult to be applied to complex structural ***,we propose a data-driven approach for high-resolution impedance inversion based on the bidirectional long short-term memory recurrent neural network,which regards seismic data as time-series rather than image-like *** with the model-based inversion method,the data-driven approach provides higher resolution inversion results,which demonstrates the effectiveness of the data-driven method for recovering the high-frequency ***,judging from the inversion results for characterization the spatial distribution of thin-layer sands,the accuracy of high-frequency components is difficult to ***,we add the model constraint to the objective function to overcome the shortages of relying only on the data-driven ***,constructing the supervisor1 based on the bidirectional long short-term memory recurrent neural network,which provides the predicted impedance with higher ***,convolution constraint as supervisor2 is introduced into the objective fu

关键词： Acoustic impedance inversion Model constraints Double supervision BiLSTM neural network Reservoir structure characterization