检索结果-南通市图书馆

Utilization of Pyrrolic Compounds as Indicators of Secondary Migration for Woodford Oils in the Anadarko Basin,Oklahoma,USA

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第5期35卷 1499-1512页

作者： Mu Liu r.paul Philp Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Geosciences University of OklahomaNorman 73109United States

Migration pathways and distances of the oils in reservoir are thought to affect the distribution of pyrrolic compounds such as carbazole,its alkyl derivatives(alkylated carbazoles)and benzocarbazoles,although other factors,including maturity and depositional environments may also affect the distribution of these organic nitrogen *** this study,14 oil samples produced from conventional reservoirs in pauls Valley,south Oklahoma were investigated using organic geochemical *** sterane and hopane fingerprints suggest that most of the oils were sourced from the Devonian Woodford *** parameters consistently indicate that the maturity level of the studied samples are all of similar maturity(rc=~0.7%),suggesting the distribution of the organic nitrogen organic compounds is possibly reflecting variations in relative migration *** distribution of alkylcarbazoles revealed a preferential enrichment during migration,with the nitrogen-shielded alkylcarbazole tending to be enriched relative to the nitrogen-semi-shielded alkylcarbozoles particularly in oils produced close to the Arbuckle uplift to the ***,another family of pyrrolic compounds,benzocarbazoles,whose distributions also indicated that the pauls Valley Woodford oils came from deeper part of the Anadarko Basin as the benzo-[a]/([a]+[c])-carbazole ratios decrease *** more specific migration systems,although the pyrrolic compound indicators are potentially disturbed by the structural complexes,the general migration directions suggest that the studied oils in pauls Valley Hunton uplift were sourced from the deep basin area,and migrate upwards in porous sediments due to the *** study investigates the feasibility of using pyrrolic compounds to estimate relative migration distances and will aid in the interpretation of migration history by using the distribution of carbazole,alkylated carbazoles,benzocarbazoles isomers in the Anadarko and Ardmore Basin

关键词： carbazole migration oil Oklahoma biomarker organic geochemistry

Using true‑triaxial stress path to simulate excavation‑induced rock damage:a case study

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2022年第4期9卷 165-180页

作者： Qingsheng Bai Cun Zhang r.paul Young State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Geotechnical Institute TU Bergakademie FreibergGustav-Zeuner-Straße 109599 FreibergGermany School of resource and Safety Engineering China University of Mining and Technology(Beijing)BeijingChina Department of Civil and Mineral Engineering University of TorontoTorontoCanada

This study presents an example illustrating the role of in situ 3D stress path method in simulating the roof damage development observed in the Mine-by tunnel at Underground research Laboratory(UrL)located in Manitoba,*** 3D stress path,at the point 1 cm in the crown of the Mine-by tunnel,was applied to a cubic Lac du Bonnet(LdB)granite sample to further understand the roof damage process and the associated *** careful calibrations,a numerical model was used to reproduce the experiment,which produced similar seismicity processes and source *** emission(AE)events obtained from laboratory and numerical modeling were converted to locations in relation to the tunnel face and were compared to the feld microseismicity(MS)occurring in the upper notch region of the Mine-by *** crack development and damage mechanism are carefully *** diference between tests and feld monitoring was *** intermediate principal stress(σ_(2))unloading process was carried out in numerical simulation to investigate its role in rock damage *** results clearly showedσ_(2)could play a signifcant role both in damage development and failure *** should be considered when predicting the damage region in underground *** study highlights the potential role of laboratory and numerical stress path tests to investigate fracture processes and mechanisms occurring during engineering activities such as tunnel excavation.

关键词： Acoustic emission Damage development In situ 3D stress path Numerical simulation True-triaxial experiment

Evidence supporting the relationship between maternal asthma and risk for autism spectrum disorders

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

Neural regeneration research 2025年第4期20卷 1101-1102页

作者： Hadley Osman paul Ashwood Department of Medical Microbiology and Immunology and the M.I.N.D.InstituteUniversity of California at DavisSacramentoCAUSA

During pregnancy,maternal immune activation(MIA),due to infection,chronic inflammatory disorders,or toxic exposures,can result in lasting health impacts on the developing *** has been associated with an increased risk of neurodevelopmental disorders,such as autism spectrum disorder(ASD)in the *** is characterized by increased repetitive and stereotyped behaviors and decreased *** of 2020,1 in 36 children are diagnosed with ASD by the age of 8 years,with ASD rates continuing to increase in prevalence in USA(Tamayo et al.,2023).Post-mortem brain studies,biomarker and transcriptomic studies,and epidemiology studies have provided compelling evidence of immune dysregulation in the circulation and brain of individuals diagnosed with ***,the etiology of ASD is largely unknown,however,genetic components and environmental factors can contribute to increased *** allergic asthma(MAA),a form of MIA,has been identified as a potential risk factor for developing neurodevelopmental disorders(Patel et al.,2020).Asthma is a chronic inflammatory condition driven by a T-helper type(TH)2 immune response.

关键词： disorders epidemiology fetus

Emerging insights into the function of very long chain fatty acids at cerebellar synapses

在线全文

学校读者我要写书评

暂无评论

Neural regeneration research 2025年第6期20卷 1709-1710页

作者： Martin-paul Agbaga Mohiuddin Ahmad Department of Cell Biology and Ophthalmology University of Oklahoma Health Sciences Centerand Dean McGee Eye InstituteOklahoma CityOKUSA

Very long chain-saturated and-polyunsaturated fatty acids(VLC-SFA and VLC-PUFA, respectively) are a functionally important class of fatty acids containing 28 carbons or more in their acyl chain. They are synthesized by the elongation of very long fatty acids-4(ELOVL4) enzyme, expressed mainly in the brain, retina, skin, testes, and meibomian gland, where these fatty acids are found(Agbaga et al., 2008). Further, these organs exhibit tissuespecific VLC-PUFA and VLC-SFA biosynthesis and incorporation into complex lipids for specific functions. In the brain, skin, and Meibomian glands, the ELOVL4 mainly makes VLC-SFA, which are incorporated into complex sphingolipids. In the retina, the ELOVL4 makes VLC-PUFA that are incorporated into phosphatidylcholine, that are critical for visual function, while in testes and sperm, the VLC-PUFA are incorporated into sphingolipids that are critical for fertility(Yeboah et al., 2021).

关键词： functions function insight

Unusual N-Alkane Distributions in Extracts from Marine Carbonate rocks at High Levels of Maturity and Overmaturity

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2002年第4期21卷 322-333页

作者：李景贵 r.paul PHILP 崔明中 State Key Laboratory of Gas Geochemistry Lanzhou Institute of Geology Chinese Academy of Sciences Lanzhou 730000 China School of Geology and Geophysics University of Oklahoma Norman OK. 73019 U. S. A

N\|alkanes in extracts from possible carbonate source rocks of the Lower Ordovician Majiagou Formation in the central gas field of the Shanganning Basin and the Upper Sinian Dengying Formation in the Weiyuan gas field of the Sichuan Basin, are characterized by bimodal distributions with the dominant carbon numbers in the range C\- 17 \|C\- 21 and C\- 25 \|C\- 29 . In most samples, the lower carbon number components are present in greater abundance than the higher carbon number ones. Most samples contain significant concentrations of waxy hydrocarbons(C\- 22+ ) with C\- 21- /C\- 22+ ratios between 0.50 to 3.16, and an average value of 1.34. The n\|alkanes in extracts of outcrops and shallow core samples of Upper Proterozoic and Lower Palaeozoic carbonate rocks in the western and southern parts of the North China Basin are of unimodal distributions dominated by n\|alkanes maximizing in the C\- 25 \|C\- 29 range. These extracts have very high concentrations of waxy hydrocarbons with C\- 21- /C\- 22+ ratios all ranging from 0 14 to 0 90 and averaging 0.36. All of the extracts have a marked odd/even predominance in the high molecular weight n\|alkane range regardless of whether they are from shallow or deep cores or outcrop samples. Simulation experiments were performed using typical sapropelic\|type kerogens from the immature Sinian Lower Xiamalin Formation carbonate\|rich shales collected at Jixian, Hebei Province, North China Basin, and the contemporary microplanktonic blue\|green algae Spirulina subsala. results indicate that the unusual distribution of n\|alkanes in the extracts of Upper Proterozoic and Lower Palaeozoic carbonate rocks possibly originated from algae in the source rocks at high levels of maturity and overmaturity.

关键词：海藻中国海相碳酸盐岩链烷双峰分面成熟期

Phage-mediated horizontal gene transfer and its implications for the human gut microbiome

在线全文

学校读者我要写书评

暂无评论

Gastroenterology report 2022年第1期10卷 78-89页

作者： Tatiana Borodovich Andrey N.Shkoporov r.paul ross Colin Hill APC Microbiome Ireland University College CorkCorkIreland School of Microbiology University College CorkCorkIreland

Horizontal gene transfer(HGT)in the microbiome has profound consequences for human health and *** spread of antibiotic resistance genes,virulence,and pathogenicity determinants predominantly occurs by way of *** exists of extensive horizontal transfer in the human gut *** transduction is a type of HGT event in which a bacteriophage transfers non-viral DNA from one bacterial host cell to *** abundance of tailed bacteriophages in the human gut suggests that transduction could act as a significant mode of HGT in the gut *** we review in detail the known mechanisms of phage-mediated HGT,namely specialized and generalized transduction,lateral transduction,gene-transfer agents,and molecular piracy,as well as methods used to detect phage-mediated HGT,and discuss its potential implications for the human gut microbiome.

关键词： gut phageome horizontal gene transfer gene transduction phage-mediated gene transfer

Newly-simplified method for hydrauli design of micro-irrigation laterals based on emission uniformity

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

排灌机械工程学报 2015年第8期33卷 691-700页

作者： Ju Xueliang Wu Pute paul r.weckler Zhu Delan Zhang Lin Institute of Soil and Water Conservation Northwest A&F University Institute of Water Saving Agriculture in Arid Areas of China Northwest A&F University Department of Biosystems and Agricultural Engineering Oklahoma State University College of Water resources and Architectural Engineering Northwest A&F University

An analytical approach was developed to design a single uniformly sloping lateral in the micro-irrigation *** uniformity was used as the water application uniformity *** relations based on the energy-gradient-line approach were revamped to account for the spatial variance of emitter outflow and the emitter connections local energy *** pressure head grade line profiles were distinguished:uphill,horizontal,gentle downhill and steep *** expressions of emission uniformity by hydraulic variation for each pressure profile were developed based on the design variables:length and diameter of lateral,emitter spacing,emitter flow equation parameters,equivalent length characterizing local losses and ground *** design conditions for selecting emitter type,the number of emitters per plant and designing the diameter of the uphill and steep downhill laterals were also *** nonlinear equations for determining lateral diameter and lateral length were solved iteratively by using the built-in root-finding function of(Tools>Goal Seek…)in the calculation spreadsheet of Microsoft *** procedures also provide the options to fix the design lateral diameter with the commercial standard size or fix the design lateral length based on the field *** operating inlet pressure and maximum amplitude of the pressure head throughout the lateral could also be determined easily by the *** numerical applications with various slope combinations indicate that the proposed analytical approach produces results close to the accurate stepwise numerical *** comparison with Keller method,the proposed approach could produce more appropriate designs.

关键词： micro-irrigation lateral slopes hydraulic design e

在线全文

学校读者我要写书评

暂无评论

基于能坡线法的微灌双向异径毛管设计

农业机械学报 2015年第12期46卷 47-54页

作者：鞠学良吴普特 weckler r.paul 张林朱德兰西北农林科技大学水土保持研究所陕西杨凌712100 俄克拉荷马州立大学生物系统与农业工程系斯蒂尔沃特74078 西北农林科技大学中国旱区节水农业研究院陕西杨凌712100

根据最佳支管位置是位于使两侧毛管灌水器平均工作压力相等处的定义,基于能坡线法推导了微灌双向异径毛管的最佳支管位置、进口工作压力、水力流量偏差系数及极限管长的计算公式,并给出了最佳支管位置参数的数值表。以此为基础,提出了3... 详细信息

根据最佳支管位置是位于使两侧毛管灌水器平均工作压力相等处的定义,基于能坡线法推导了微灌双向异径毛管的最佳支管位置、进口工作压力、水力流量偏差系数及极限管长的计算公式,并给出了最佳支管位置参数的数值表。以此为基础,提出了3种常见设计情况下的微灌双向异径毛管设计步骤。通过3个设计实例表明:该方法准确可靠,可以简便快速地设计各种均匀坡条件下的微灌系统双向异径毛管,提高微灌工程设计效率。

关键词：微灌双向异径毛管压力分布解析模型

在线全文

学校读者我要写书评

暂无评论

均匀坡微灌毛管适宜布置形式优选

农业机械学报 2016年第5期47卷 123-128页

作者：鞠学良吴普特 weckler r.paul 张林朱德兰西北农林科技大学水土保持研究所陕西杨凌712100 俄克拉荷马州立大学生物系统与农业工程系斯蒂尔沃特74078 中国旱区节水农业研究院陕西杨凌712100

根据微灌毛管水力解析模型,通过分析微灌双向布置和单向顺坡布置形式对流量偏差率及毛管进口工作水头的影响,得出均匀坡微灌毛管双向布置的适用条件为最佳支管位置参数大于0.13,当最佳支管位置参数不大于0.13时,微灌毛管宜单向顺坡布置... 详细信息

根据微灌毛管水力解析模型,通过分析微灌双向布置和单向顺坡布置形式对流量偏差率及毛管进口工作水头的影响,得出均匀坡微灌毛管双向布置的适用条件为最佳支管位置参数大于0.13,当最佳支管位置参数不大于0.13时,微灌毛管宜单向顺坡布置。给出了考虑适宜布置形式的均匀坡微灌毛管设计步骤。通过2个设计实例表明:利用最佳支管位置参数标准可有效选取适宜的毛管布置形式,设计步骤简便可行,可直接应用于微灌工程实践中。

关键词：微灌布置形式双向毛管解析模型