检索结果-南通市图书馆

Discovery of “Enveloping Surface of Oil and Gas Overpressure Migration” in the Songliao Basin and its bearings on hydrocarbon migration and accumulation mechanisms

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2012年第12期55卷 2005-2017页

作者： FENG ZhiQiang ZHANG Shun FENG zihui Daqing Oil Field Corporation Ltd.of China Petroleum Daqing 163712China

The Fuyang oil layer of the Songliao Basin is a tight and low-permeability sandstone pay zone formed in the fluvial-shallow water delta *** the formation are mainly lithologic reservoir and tight *** lacustrine-mudstone of K2qn1 is a good source rock and also acts as a good regional cap *** Fuyang oil layer is a typical upper-source and lower-reservoir pattern distributed in a large *** on a large number of exploration and development data, a macroscopic enveloping surface is found developed in the Fuyang oil layer, which is below *** effective reservoirs within the enveloping surface are commonly saturated with oil, and below the enveloping surface are mainly water *** distance from the enveloping surface to the bottom of the source rock is usually 100-350 m and at most 550 *** the research of the distribution patterns and the physical properties of the sandbodies above or beneath the source rock, it is concluded that: 1) the enveloping surface is the boundary of the overpressure hydrocarbon migration; 2) the spacial distribution of the pressure release beds controls the direction and the distance of the overpressure hydrocarbon migration; 3) tight oil reservoirs and lenticular oil reservoirs are mainly formed inside the envelope surface, whereas, conventional reservoirs are formed outside the envelope surface as a result of the buoyancy hydrocarbon *** discovery of the "overpressure hydrocarbon migration enveloping surface" and the concepts of overpressure hydrocarbon migration and buoyancy hydrocarbon migration not only challenge the old notion that "hydrocarbon migrates along the faults and is distributed along fault belts" in the Fuyang oil layer of the Songliao Basin, give a new explanation to the long-distance-oil-downwards migration (hundreds of meters) and expand the exploration potential of the Fuyang oil layer, and provide a rational guidance to the exploration of syncline plays, but also bette

关键词： enveloping surface overpressure migration buoyancy migration pressure release bed tight oil and gas Songliao Basin

The age of vanadium-based nanozymes: Synthesis, catalytic mechanisms, regulation and biomedical applications

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 52-60页

作者： Shuaiwen Li zihui Chen Feng Yang Wanqing Yue Department of Chemistry Key Laboratory of Biomedical Functional MaterialsSchool of ScienceChina Pharmaceutical UniversityNanjing 211198China Key Laboratory of Drug Quality Control and Pharmacovigilance(China Pharmaceutical University) Ministry of EducationNanjing 211198China

Nanomaterials with enzyme-mimic(nanozyme) activity have garnered considerable attention as a potential alternative to natural enzymes, thanks to their low preparation cost, high activity, ease of preservation, and unique physicochemical properties. Vanadium(V) is a transition metal that integrates the benefits of valence-richness, low cost, and non-toxicity, making it a desirable candidate for developing a range of emerging nanozymes. In this review, we provide the first systematic summary of recent research progress on V-based nanozymes. First, we summarize the preparation of V-based nanozymes using both top-down and bottom-up synthesis methods. Next, we review the mechanism of V-based nanozymes that mimic the activity of various enzymes. We then discuss methods for regulating V-based nanozyme activity, including morphology, size, valence engineering, defect engineering, external triggering, and surface engineering. Afterward, we outline various biomedical applications, including therapeutic, anti-inflammatory, antibacterial, and biosensing. Finally, we prospect the challenges and countermeasures for V-based nanozymes based on their development. By summarizing recent research progress on V-based nanozymes, we hope to provide useful insights for researchers to further explore their potential applications and overcome their existing challenges.

关键词： Vanadium Nanozymes Catalytic mechanisms Biomedical applications Regulation

A New Enantiornitine Bird with Four Long Rectrices from the Early Cretaceous of Northern Hebei,China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2007年第5期81卷 703-708页

作者： ZHENG Xiaoting ZHANG zihui HOU Lianhai Tianyu Natural Museum of Shandong Pingyi 273300 China College of Life Sciences Capital Normal University Beijing 100037 China Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Science Beijing 100044 China

Paraprotopteryx gracilis, a new enantiornithine bird from the Early Cretaceous Yixian Formation in Fengning, northern Hebei Province is erected, based on the following characters： Yshaped furcula with a long hypocleidum and a much narrow interclavicular angle, and the morphology of the sternum are different from other enantiornithines. Additionally, alular digit bearing the biggest manual claw extends distally to the distal end of the major metacarpal; the minor metacarpal is slender than the major metacarpal. Carpometacarpus only fused proximally; astragalus and calcaneum partially fused to one another but unfused to the tibia. This is the first record of Mesozoic birds in having four long rectrices, which may represent morphologically a secondary sexual character, an intermediate stage from elongated scale to branched feather, and possess functional advantage in supplementing the lifting surface to compensate the unskilled flight.

关键词： Early Cretaceous Paraprotopteryx gracilis enantiornithine rectrices Fengning Hebei Province

The Geoscience Frontier of Gulong Shale Oil:Revealing the Role of Continental Shale from Oil Generation to Production

在线全文

学校读者我要写书评

暂无评论

Engineering 2023年第9期28卷 79-92页

作者： Wenyuan He Rukai Zhu Baowen Cui Shuichang Zhang Qian meng Bin Bai zihui Feng Zhengdong Lei Songtao Wu Kun He He Liu Longde Sun China National Oil and Gas Exploration and Development Company Ltd. Beijing 100027China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China Key Laboratory of Shale Oil Accumulation of Heilongjiang Province Daqing 163712China Daqing Oilfield Company Ltd. PetroChinaDaqing 163712China China National Petroleum Corporation Beijing 100007China

The clay mineral content of Daqing Gulong shale is in the range of about 35%–45%,with particle sizes less than 0.0039 *** horizontal fluidity of oil in Gulong shale is poor,with near-zero vertical *** a result,Gulong shale has been considered to lack commercial *** recent years,however,interdisciplinary research in geoscience,percolation mechanics,thermodynamics,and surface mechanics has demonstrated that Gulong shale oil has a high degree of maturity and a high residual hydrocarbon *** expulsion efficiency of Gulong shale in the high mature stage is 32%–48%.Favorable storage spaces in Gulong shale include connecting pores and lamellar fractures developed between and within organic matter and clay mineral *** shale oil mainly occurs in micro-and nano-pores,bedding fractures,and lamellar fractures,with a high gas–oil ratio and medium–high movable oil *** shale has the characteristics of high hardness,a high elastic modulus,and high fracture *** study achieves breakthroughs in the exploration and development of Gulong shale,including the theories of hydrocarbon generation and accumulation,the technologies of mobility and fracturing,and *** confirms the major transition of Gulong shale from oil generation to oil production,which has extremely significant scientific value and application potential for China’s petroleum industry.

关键词： Gulong shale Gulong shale oil Micro-nano pores Lamellar fracture Continental oil production

Myological variation in the hindlimb of three raptorial birds in relation to foraging behavior

在线全文

学校读者我要写书评

暂无评论

Avian Research 2022年第3期13卷 390-397页

作者： Xinxin Liang Mingjie Liu Chenxi Ying zihui Zhang College of Life Sciences Capital Normal UniversityBeijing100048China

Raptors share a common predatory lifestyle,but are different in food preferences and hunting *** grip force and talons’grasping capabilities are fundamentally crucial for subduing and killing their prey to feed,but the abilities and differences to generate force are less *** this study,the entire pelvic muscles were dissected with the muscle mass and fibre length measured and physiological cross-sectional area counted in the Common Kestrel(Falco tinnunculus),Eurasian Sparrowhawk(Accipiter nisus),and Long-eared Owl(Asio otus).Statistical tests were performed to explore the possible differences in architectural parameters among *** species were same in distributing the greatest proportion of muscle mass to the shank region and the digital flexor functional group,allocating more than 60%muscle mass in relation to total single leg muscle mass to the same seven individual muscles including flexor digitorum longus(FDL),flexor hallucis longus(FHL),and tibialis cranialis(TC)which are three major muscles responsible for talon *** differentiations were most present in the shank and tarsus instead of other regions of the leg,which might reflect their difference in hunting mode and foot *** force-generation capacity of FHL and some anatomical features suggest that digits 1and 2 work together as an efficiently vise-like set,playing more critical role than digits 3–4 in foraging of diurnal raptors but to a different *** accordance with zygodactyl foot morphology,each digit of the Long-eared Owl plays a subequal role when hunting,evidenced by anatomical and architectural *** of its unique insertion to the base of the pygostyle,the striking numerical difference in the development of *** was possibly related to raptors’flight behavior and feeding *** from anatomical and architectural aspects,the similarities and differences of the hindlimb musculature were correlated to common predatory li

关键词： Architecture Birds of prey Functional morphology Grip force Pelvic muscles Talon closure

Efficient Untargeted White-Box Adversarial Attacks Based on Simple Initialization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第4期33卷 979-988页

作者： Yunyi ZHOU Haichang GAO Jianping HE Shudong ZHANG zihui WU School of Computer Science and Technology Xidian University

Adversarial examples(AEs) are an additive amalgamation of clean examples and artificially malicious perturbations. Attackers often leverage random noise and multiple random restarts to initialize perturbation starting points, thereby increasing the diversity of AEs. Given the non-convex nature of the loss function, employing randomness to augment the attack's success rate may lead to considerable computational overhead. To overcome this challenge,we introduce the one-hot mean square error loss to guide the initialization. This loss is combined with the strongest first-order attack, the projected gradient descent, alongside a dynamic attack step size adjustment strategy to form a comprehensive attack process. Through experimental validation, we demonstrate that our method outperforms baseline attacks in constrained attack budget scenarios and regular experimental settings. This establishes it as a reliable measure for assessing the robustness of deep learning models. We explore the broader application of this initialization strategy in enhancing the defense impact of few-shot classification models. We aspire to provide valuable insights for the community in designing attack and defense mechanisms.

关键词： Deep learning Additives Perturbation methods Noise Mean square error methods Robustness Glass box

Transient fluid flow in the Binbei district of the Songliao Basin, China Evidence from apatite fission track thermochronology

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2013年第3期10卷 314-326页

作者： Xiang Caifu Martin Daniík Feng zihui State Key Laboratory for Petroleum Resource and Prospecting China University of Petroleum College of Geosciences China University of Petroleum Department of Earth & Oceanic Sciences University of Waikato Prospecting and Exploration Institute of Daqing Oil Field

The Songliao Basin is famous for the Daqing Oilfield, the biggest in China. However, no economic hydrocarbon reservoir has been found in the northeastern Binbei district. Its thermal history, which is of great importance for hydrocarbon generation and migration, is studied with apatite fission track （AFT） thermochronology. Samples with depositional ages of the late Cretaceous （-108-73 Ma） are analyzed. The AFT ages of the samples from reservoir rock （depositional age 〉 76.1 Ma） fall between the late Cretaceous （724-5 Ma） and the early Eocene （414-3 Ma） period, indicating their total annealing after deposition. In contrast, two samples from the main seals of the Qingshankou （depositional age 〉 89.3 Ma） and the Nenjiang Formation （depositional age 〉 73.0 Ma） are not annealed or partially annealed （AFT ages of 974-9 Ma and 704-4 Ma, respectively）. Because the maximum burial temperature （〈90 ℃） evidenced by low vitrinite reflectance （Ro〈0.7） is not high enough to account for the AFT total annealing （110-120 ℃）, the transient thermal effect arising from the syntectonic fluid flow between the late Cretaceous and the early Eocene is proposed. Transient thermal effects from fluid flow explains the indicated temperature discrepancies between the AFT thermometer and the Ro thermometer because the transient thermal effect from the fluid flow with a temperature high enough （110-120 ℃） to anneal the AFT thermometer does not last long enough （104-105 yrs.） for an enhancement of the Ro （minimum 106- 107 yrs. under the same temperature）. This indicates that dating thermal effect from fluid flow might be a new means to reconstruct the tectonic history. It also answers why the samples from the main seals are not annealed because the seals will prohibit fluid flow and supply good thermal insulation. The large-scale fluid flow in the Binbei district calls for a new idea to direct the hydrocarbon exploration.

关键词： Apatite fission track vitrinite reflectance transient fluid flow Binbei district Songliao Basin

利用顶空-气相色谱-离子迁移谱结合电子鼻分析黑鱼蒸制过程中挥发性风味物质的变化

在线全文

学校读者我要写书评

暂无评论

食品与发酵工业 2025年第1期51卷 322-329,I0014-I0018页

作者：栗紫慧曲映红施文正顾金晖刘一漪张震姜昕上海海洋大学食品学院上海201306 国家淡水水产品加工技术研发分中心(上海) 上海201306

以黑鱼为研究对象,通过顶空-气相色谱-离子迁移谱(headspace-gas chromatography-ion mobility spectrometry,HS-GC-IMS)技术结合电子鼻及感官评定分析腌制黑鱼蒸制过程中挥发性风味物质的变化情况。结果表明,采用GC-IMS法从蒸制黑鱼中... 详细信息

以黑鱼为研究对象,通过顶空-气相色谱-离子迁移谱(headspace-gas chromatography-ion mobility spectrometry,HS-GC-IMS)技术结合电子鼻及感官评定分析腌制黑鱼蒸制过程中挥发性风味物质的变化情况。结果表明,采用GC-IMS法从蒸制黑鱼中共鉴定出43种挥发性物质,醛类、醇类化合物的含量最高,占主导地位,其中醛类物质阈值低,是蒸制黑鱼的主要呈味物质,并于蒸制12 min时在所有挥发性风味物质中占比最高,达到33.92%;其次是酮类和酯类。GC-IMS结合电子鼻以及感官评定的分析结果表明,生鱼与蒸制黑鱼的挥发性成分差异显著,腌制黑鱼在蒸制12 min时的挥发性风味最佳,丁醛、异丁醛、(E)-2-戊烯醛、丁醇、2-甲基丁醇、2-丁酮、2,5-二甲基吡嗪、四氢呋喃的相对含量在蒸制12 min时最高,为12 min时的特征风味物质。该研究可为黑鱼最佳蒸制工艺的确定及黑鱼加工、开发预制菜提供一定的理论依据。

关键词：黑鱼蒸制气相色谱-离子迁移色谱电子鼻挥发性成分

Neurotoxic effects of iron overload under high glucose concentration

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2013年第36期8卷 3423-3433页

作者： Shi Zhao Lin Zhang zihui Xu Weiqun Chen Department of Endocrinology Wuhan Central Hospital Central Laboratory Wuhan Central Hospital

Iron overload can lead to cytotoxicity, and it is a risk factor for diabetic peripheral neuropathy. However, the underlying mechanism remains unclear. We conjectured that iron overload-induced neurotoxicity might be associated with oxidative stress and the NF-E2-related factor 2 （Nrf2）/ARE signaling pathway. As an in vitro cellular model of diabetic peripheral neuropathy, PC12 cells ex- posed to high glucose concentration were used in this study. PC12 cells were cultured with ferric ammonium citrate at different concentrations to create iron overload. PC12 cells cultured in ferric ammonium citrate under high glucose concentration had significantly low cell viability, a high rate of apoptosis, and elevated reactive oxygen species and malondialdehyde levels. These changes were dependent on ferric ammonium citrate concentration. Nrf2 mRNA and protein expression in the ferric ammonium citrate groups were inhibited markedly in a dose-dependent manner. All changes could be inhibited by addition of deferoxamine. These results indicate that iron overload aggravates oxidative stress injury in neural cells under high glucose concentration and that the Nrf2/ARE sigfnaling pathway might play an important role in this process.

关键词： neural regeneration peripheral nerve injury iron overload oxidative stress diabetic peripheral neuropathy reactive oxygen species high glucose PC12 cells Nrf2/ARE grants-supported paper neuroregeneration