检索结果-南通市图书馆

Characteristics and main controlling factors of helium resources in the main petroliferous basins of the North China Craton

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2024年第2期43卷 23-33页

作者： Zihan Gao Zhi Chen Hongyi He Zhaofei Liu chang lu Hanyu Wang Yili luo Ying Li Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China College of Geosciences China University of Petroleum-BeijingBeijing 102249China School of Earth Science and Resources China University of Geosciences(Beijing)Beijing 100083China

At present, the main controlling factors of helium accumulation is one of the key scientific problems restricting the exploration and development of helium reservoir. In this paper, based on the calculation results of He generation rate and the geochemical characteristics of the produced gas, both the similarities and differences between natural gas and He resources in the Bohai Bay, Ordos and the surrounding Songliao Basin are compared and analyzed, discussing the main controlling factors of helium resources in the three main petroliferous basins of the North China Craton. It is found that the three basins of Bohai Bay, Ordos and Songliao have similar characteristics of source rocks, reservoirs and cap rocks, that's why their methane resource characteristics are essentially the same. The calculated ~4He generation per cubic metamorphic crystalline basement in the three basins is roughly equivalent, which is consistent with the measured He resources, and it is believed that the ~4He of radiogenic from the crust is the main factor controlling the overall He accumulation in the three basins;there is almost no contribution of the mantle-derived CH_4, which suggests that the transport and uplift of mantle-derived ~3He carried by the present-day magmatic activities along the deep-large faults is not the main reason for the mantle-derived ~3He mixing in the basins. Combined with the results of regional volcanic and geophysical studies,it is concluded that under the background of the destruction of North China Craton, magma intrusion carried a large amount of mantle-derived material and formed basic volcanic rocks in the Bohai Bay Basin and Songliao Basin, which replenished mantle-derived ~3He for the interior of the basins, and that strong seismic activities in and around the basins also promoted the upward migration of mantle source ~3He. This study suggests that the tectonic zone with dense volcanic rocks in the Cenozoic era and a high incidence of historical strong ear

关键词： Helium Bohai Bay Basin destruction of the North China Craton fault Cenozoic volcanic rocks strong earthquake activity

New material of Coniopteris simplex from the Middle Jurassic of the Ordos Basin,Inner Mongolia,China and implications on its spatio-temporal distribution and paleogeography

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2024年第2期13卷 199-211页

作者： Yun-Feng Li chang-lu Zhang Fei Liang Xiao Tan Fan-Hao Gong Chun-Lin Sun Tao Li Yu-Ling Na Research Center of Paleontology and Stratigraphy Jilin UniversityChangchun 130026Jilin ProvinceChina College of Earth Sciences Jilin UniversityChangchun 130061Jilin ProvinceChina College of Paleontology Shenyang Normal UniversityShenyang 110034Liaoning ProvinceChina Key Lab of Evolution of Past Life in NE Asia Ministry of Natural ResourcesShenyang Normal UniversityShenyang 110034Liaoning ProvinceChina Shenyang Center of Geological Survey China Geological SurveyShenyang 110034Liaoning ProvinceChina

Coniopteris simplex is a common component in many Jurassic ***,due to morphological variations in sterile fronds and incomplete preservation of reproductive organs,its classification has been controversial for a long ***,we present new material collected from the Middle Jurassic Yan’an Formation in the Ordos Basin,Inner *** new material reveals important morphological characters,including hemi-dimorphic fronds,two forms of sterile pinnae,short-stalked sori and sporangia on fertile fronds,annulus of sporangium composed of about 30 cells,in situ rounded triangular spores with protruded suture,and the lips of trilete laesura encircled by one or two rows of small *** on these observations,we emended the diagnosis of this common *** spatio-temporal distribution of Coniopteris simplex shows that the iconic species was restricted to the paleolatitudes ranging from 19.5°N to 48.9°N in the Northern Hemisphere during the Early—Late Jurassic,mainly distributed in the tropical to paratropical zones,and the paleolongitude ranging from 9.6°E to 129.3°E,which may be limited by the opening of the Viking Corridor and the splitting of the Central Atlantic Ocean.

关键词： Coniopteris simplex Yan'an Formation Middle Jurassic Inner Mongolia Paleogeography

Efficacy and safety of perioperative therapy for locally resectable gastric cancer:A network meta-analysis of randomized clinical trials

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第3期16卷 1046-1058页

作者： Zi-Yu Kuang Qian-Hui Sun lu-chang Cao Xin-Yi Ma Jia-Xi Wang Ke-Xin Liu Jie Li Graduate College Beijing University of Traditional Chinese MedicineBeijing 100029China Oncology Department Guang’anmen HospitalChina Academy of Chinese Medical SciencesBeijing 100053China

BACKGROUND Gastric cancer(GC)is the fifth most commonly diagnosed malignancy worldwide,with over 1 million new cases per year,and the third leading cause of cancer-related *** To determine the optimal perioperative treatment regimen for patients with locally resectable *** A comprehensive literature search was conducted,focusing on phase II/III randomized controlled trials(RCTs)assessing perioperative chemotherapy and chemoradiotherapy in treating locally resectable *** R0 resection rate,overall survival(OS),disease-free survival(DFS),and incidence of grade 3 or higher nonsurgical severe adverse events(SAEs)associated with various perioperative regimens were analyzed.A Bayesian network meta-analysis was performed to compare treatment regimens and rank their *** Thirty RCTs involving 8346 patients were included in this *** XELOX plus neoadjuvant radiotherapy and neoadjuvant CF were found to significantly improve the R0 resection rate compared with surgery alone,and the former had the highest probability of being the most effective option in this *** plus adjuvant FLOT was associated with the highest probability of being the best regimen for improving *** to limited data,no definitive ranking could be determined for *** nonsurgical SAEs,FLO has emerged as the safest treatment *** This study provides valuable insights for clinicians when selecting perioperative treatment regimens for patients with locally resectable *** studies are required to validate these findings.

关键词： Gastric cancer Perioperative treatment Network meta-analysis Efficacy and safety

Thickening progression mechanism of silica fume-oil well cement composite system at high temperatures

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

Petroleum Science 2024年第4期21卷 2793-2805页

作者： Hang Zhang Miao-Miao Hu Peng-Peng Li Guo-Qing Liu Qing-lu chang Jie Cao Ming Liu Wen-Hua Xu Xiu-Jian Xia Jin-Tang Guo School of Chemical Engineering and Technology Tianjin University Zhejiang Institute of Tianjin University Haihe Laboratory of Sustainable Chemical Transformations CNPC Engineering Technology R&D Company Limited

This work studied the thickening progression mechanism of the silica fume-oil well cement composite system at high temperatures(110-180.C) in order to provide a theoretical guidance for the rational application of silica fume in the cementing engineering. Results showed that silica fume seldom affected the thickening progression of oil well cement slurry at 110-120.C, but when temperature reached above130.C, it would aggravate the bulging degree of thickening curves and significantly extend the thickening time, meanwhile causing the abnormal “temperature-based thickening time reversal” and“dosage-based thickening time reversal” phenomena in the range of 130-160.C and 170-180.C respectively. At 130-160.C, the thickening time of oil well cement slurry was mainly associated with the generation rate of calcium hydroxide(CH) crystal. The introduced silica fume would be attracted to the cement minerals' surface that were hydrating to produce CH and agglomerate together to form an“adsorptive barrier” to hinder further hydration of the inner cement minerals. This “adsorptive barrier”effect strengthened with the rising temperature which extended the thickening time and caused the occurrence of the “temperature-based thickening time reversal” phenomenon. At 170-180.C, the pozzolanic activity of silica fume significantly enhanced and considerable amount of C-S-H was generated, thus the “temperature-based thickening time reversal” vanished and the “dosage-based thickening time reversal” was presented.

关键词： Silica fume Oil well cement Thickening time reversal Pozzolanic reaction Adsorptive barrier CH and C−S−H

Creep rupture life predictions for Ni-based single crystal superalloys with automated machine learning

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第6期43卷 2884-2890页

作者： chang-lu Zhou Rui-Hao Yuan Wei-Jie Liao Ting-Huan Yuan Jiang-Kun Fan Bin Tang Ping-Xiang Zhang Jin-Shan Li Turab Lookman State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Chongqing Innovation Center Northwestern Polytechnical UniversityChongqing 401120China AiMaterials Research LLC Santa FeNM 87501USA

The state of the art for data-driven creep rupture life predictions incorporates microstructural and deformation characteristics into machine ***,the microstructures and deformation mechanisms for unknown alloys are inaccessible and uncertain before experiments are carried out,and therefore prevents extrapolations of the learned models.

关键词： deformation life creep

Evaluation of the famous classic formula Sanhua decoction based on network pharmacology and multi-component quantitative analysis

在线全文

学校读者我要写书评

暂无评论

Traditional Medicine Research 2024年第1期9卷 1-13页

作者： Xin Zhang Wan-Cui Wang Jin-Kui Zhang Wei-Mei Zhang Peng-Wang Wang Peng-Cheng Lin Yong-chang lu Xia Li Wen-Yuan Gao College of Pharmacy Qinghai Minzu UniversityXining 810000China Qinghai Key Laboratory of Phytochemistry on Qinghai-Tibet Plateau Qinghai Minzu UniversityXining 810000China School of Pharmaceutical Science and Technology Tianjin UniversityTianjin 300000China Qinghai Engineering Technology Research Center of Modern Tibetan Medicine Creation Qinghai Minzu UniversityXining 810000China

Background:Sanhua decoction has significant effects in the treatment of *** study of the Sanhua decoction material benchmark was carried out to analyze the value transfer relationship between the Chinese herbal pieces and the substance ***:Network pharmacology was employed to investigate the potential active components and molecular mechanisms of Sanhua decoction in the treatment of stroke.15 batches of Sanhua decoction lyophilized powder were prepared using traditional formulas and subjected to high-performance liquid chromatography analysis to generate fingerprints of the Sanhua decoction substance ***,a multi-component quantitative analysis method was established,allowing for the simultaneous determination of ten components,to study the transfer of quantity values between pieces and substance ***:60 active ingredients were screened from Sanhua decoction by network pharmacology,of which gallic acid,magnolol honokiol,physcion,and aloe-emodin may have a greater effect than other active components.63 key targets and 134 pathways were predicted as the potential mechanism of Sanhua decoction in treating *** fingerprint similarity of the Sanhua decoction substance benchmarks was found to be good among the 15 batches,confirming the 19 common *** content of the 10 components was basically *** components’transfer rates were within 30%of their respective ***:This study provided a comprehensive and reliable strategy for the quality evaluation of Sanhua decoction substance benchmarks and held significant importance in improving its application value.

关键词： Sanhua decoction classic famous formula HPLC fingerprinting value transfer network pharmacology

油菜翻压与生物炭施用对新建温室土壤性状影响研究

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

土壤通报 2024年第3期55卷 677-685页

作者：王威卢树昌天津农学院农学与资源环境学院天津300392

【目的】为合理高效培肥新建温室土壤提供技术支持。【方法】以稻壳生物炭和绿肥油菜为供试材料,设计无生物炭加绿肥(0+22.5 t hm^(-2),GM)、生物炭和绿肥配施(22.5+22.5 t hm^(-2),BC+GM)、无生物炭无绿肥(0+0 kg hm^(-2),CK)3个处理,... 详细信息

【目的】为合理高效培肥新建温室土壤提供技术支持。【方法】以稻壳生物炭和绿肥油菜为供试材料,设计无生物炭加绿肥(0+22.5 t hm^(-2),GM)、生物炭和绿肥配施(22.5+22.5 t hm^(-2),BC+GM)、无生物炭无绿肥(0+0 kg hm^(-2),CK)3个处理,进行小区玉米栽培试验,研究油菜翻压与生物炭施用对土壤性状影响。【结果】在整个翻压培肥在过程中,BC+GM处理土壤团粒结构R0.25值最高,土壤容重最低、田间持水量最高,土壤有机质、可溶性有机碳、全氮、铵态氮、有效磷、速效钾含量和CEC均为最高,28 d时分别为4.86%、1.45 g cm-3、24.08%、17.82 g kg^(-1)、115.33 mg kg^(-1)、0.91 g kg^(-1)、1.31 mg kg^(-1)、45.16 mg kg^(-1)、428.93 mg kg^(-1)和18.09 cmol (+) kg^(-1),均显著高于CK处理(p <0.05)。GM处理效果次之,但该处理的土壤硝态氮含量最高、pH值最低,28d时分别为232.56 mg kg^(-1)和7.87,均显著高于CK处理(p <0.05)。土壤脲酶活性、碱性磷酸酶活性、微生物量碳氮含量以BC+GM处理为最高,28 d时分别为0.690 mg (g d)^(-1)、0.2628 mg×10^(-1)(g d)^(-1)、151.81 mg kg^(-1)、5.71 mg kg^(-1);GM处理效果次之,CK处理最低,CK处理与BC+GM处理间差异显著(P <0.05)。另外,BC+GM处理的玉米籽粒产量、干物质量亦最高。【结论】BC+GM处理(22.5+22.5 t hm^(-2))对土壤性状改善效果最好,可优先用于当地新建温室土壤培肥。

关键词：油菜翻压生物炭新建温室土壤性状

在线全文

学校读者我要写书评

暂无评论

二氧化钒在太赫兹超材料中的研究进展

硅酸盐学报 2024年第7期52卷 2371-2380页

作者：高敏罗毅恒路畅林媛电子科技大学材料与能源学院成都610054

超材料具有在亚波长尺度下操控电磁波的能力,近年来,通过对光场、电场、机械或温度场动态调控可以改变其光学特性的主动式超材料受到了广泛的研究。二氧化钒具有在68℃的临界温度下从低温绝缘相转变为高温金属相的特性,其电导率能够实现... 详细信息

超材料具有在亚波长尺度下操控电磁波的能力,近年来,通过对光场、电场、机械或温度场动态调控可以改变其光学特性的主动式超材料受到了广泛的研究。二氧化钒具有在68℃的临界温度下从低温绝缘相转变为高温金属相的特性,其电导率能够实现4~5个数量级的变化,将二氧化钒与超材料相互结合,能够满足可调谐性、高调制深度、多种调谐手段等优点。本文从二氧化钒的相变特性出发,归纳总结了二氧化钒在太赫兹超材料中的不同应用方向,主要包括可调谐太赫兹超材料吸波器、太赫兹调制器、太赫兹波前调控器以及可编程超材料,最后讨论了二氧化钒在太赫兹超材料应用中所面临的挑战和未来的发展方向。

关键词：超材料二氧化钒相变材料可调谐

在线全文

学校读者我要写书评

暂无评论

基于避险脱离的自动驾驶路测安全影响因素

吉林大学学报（工学版） 2024年第7期54卷 1935-1943页

作者：涂辉招鹿畅陆淼嘉李浩同济大学道路与交通工程教育部重点实验室上海201804

本文采用自动驾驶路测避险脱离率来表征自动驾驶路测风险。首先基于大量自动驾驶路测实测数据,采用LSTM方法辨识自动驾驶路测避险脱离,并基于Tobit模型分析车道宽度、天气等动静态因素对路测避险脱离率的影响,由此建立基于避险脱离的自... 详细信息

本文采用自动驾驶路测避险脱离率来表征自动驾驶路测风险。首先基于大量自动驾驶路测实测数据,采用LSTM方法辨识自动驾驶路测避险脱离,并基于Tobit模型分析车道宽度、天气等动静态因素对路测避险脱离率的影响,由此建立基于避险脱离的自动驾驶路测安全模型。本文安全模型从更为积极主动的角度来规避自动驾驶路测事故,保障自动驾驶路测安全有序地进行。

关键词：交通运输工程自动驾驶路测避险脱离安全影响因素 Tobit模型