检索结果-南通市图书馆

What Caused the inconsistency between Rb-Sr and^(40)Ar-^(39)Ar Ages of Authigenic illites?

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2022年第5期33卷 1145-1151页

作者： Entao Liu i.tonguc uysal Jian-Xin Zhao Zi'ao Zhang Xudong Lin Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China Radiogenic isotope Facility School of Earth and Environmental SciencesThe University of QueenslandBrisbaneQld4072Australia Department of Geological Engineering Istanbul University-CerrahpaşaIstanbul34098Turkey

Radiogenic isotope dating of illitic clays has been widely used to reconstruct thermal and fluid flow events in siliciclastic sedimentary basins,the information of which is critical to investigate mechanisms of hydrocarbon *** study carried out Rb-Sr and^(40)Ar-^(39)Ar dating of authigenic illitic clay samples separated from the Palaeogene sandstone in the northern South China *** Rb-Sr data further confirm the previously reported three periods of fluid flow events(at 34.5±0.9,31.2±0.6,and 23.6±0.8 Ma,respectively)in the northern South China Sea,which are related to regional episodic ***,^(40)Ar-^(39)Ar ages of illite obtained in this study are significantly younger than the corresponding Rb-Sr *** significantly younger^(40)Ar-^(39)Ar ages were probably due to ^(40)Ar loss caused by later dry heating events on the Hainan island that have not affected the Rb-Sr isotopic *** inconsistency between Rb-Sr and^(40)Ar-^(39)Ar data should be attributed to different isotopic behaviors of K-Ar and Rb-Sr isotopic systematics in *** results indicate that Rb-Sr isotopic dating method may be a preferential approach for clay dating in geological settings where exist younger dry heating events.

关键词： authigenic illite isotope dating Rb−Sr isochron ^(40)Ar-^(39)Ar dating inconsistency geochemistry

Selenium: The Cancer Shield

在线全文

学校读者我要写书评

暂无评论

Journal of Biosciences and Medicines 2024年第7期12卷 170-183页

作者： Elvin uysal Busra Yaman Aydin incirliova Bahcesehir High School Aydin Trkiye

introduction: Breast cancer is one of the most common types of cancer in the world and the treatments are being improved day by day. Although chemotherapy agents have begun to be used, side effects, resistance development and toxicity seen with these drugs are still steps that limit treatment. Objective: Our aim in this study is to show whether sodium selenate (NaS), which has different effects on many different cells, has antiproliferative and apoptotic effects on MCF-7 breast cancer cells, considering the dose-time relationship, and to reveal its effect on oxidant stress parameters. Methods: 10, 20, 30, 40 and 50 μM sodium selenate was applied to the cells for 24, 48 and 72 hours. MTT test was applied to show the proliferative effect. Apoptosis was also measured with Annexin V/7AAD in MCF7 cells. Malondaldehyde (MDA) and Glutathione (GSH) levels were studied to reveal the oxidant/antioxidant balance. Results: it has been shown that as the NaS dose increases in MCF-7 cells, cell viability decreases (p 0.05), but at all subsequent increasing NaS doses, viability was found statistically significant decreased (p: 0.001, p 0.05, respectively). Conclusion: Considering that NaS has an antitumor effect on breast cancer, increases oxidative stress and increases apoptosis by supressing the antioxidant protection system, and does not have a toxic effect on normal body cells at certain doses. When all these features evaluated, we think, selenium should be considered as a natural option in the treatment of breast cancer.

关键词： Sodium Selenite Breast Cancer Apoptosis Oxidative Stress

热事件发育地区自生黏土矿物形成过程分析:以北部湾盆地福山凹陷为例

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

矿物岩石地球化学通报 2017年第1期36卷 59-66页

作者：刘恩涛王华沈能平 ZHAO Jian-xin FENG Yue-xing uysal i.tongu 中国地质大学(武汉)海洋学院武汉430074 中国地质大学(武汉)构造与油气资源教育部重点实验室武汉430074 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550081 Radiogenic isotope Facility School of Earth SciencesThe University of Queensland

自生黏土矿物形成过程是个备受关注的科学问题,查明该过程对于盆地热史分析至关重要。本次研究以北部湾盆地福山凹陷岩浆侵入体附近的沉积砂岩为研究对象,使用离心机分离出不同粒度的自生黏土矿物,并对其进行系统的矿物学、Rb-Sr年代学... 详细信息

自生黏土矿物形成过程是个备受关注的科学问题,查明该过程对于盆地热史分析至关重要。本次研究以北部湾盆地福山凹陷岩浆侵入体附近的沉积砂岩为研究对象,使用离心机分离出不同粒度的自生黏土矿物,并对其进行系统的矿物学、Rb-Sr年代学及^(40)Ar-^(39)Ar年代学研究。结果表明,粗砂岩中自生黏土矿物富集且纯度很高,是开展年代学分析的理想对象;Rb-Sr等时线定年结果显示自生黏土矿物形成年代为~31 Ma,该年龄与岩浆岩U-Pb年代具有非常好的耦合关系,而^(40)Ar-^(39)Ar定年法受到"^(40)Ar丢失"的影响而缺乏地质意义。本次研究说明热事件发育地区自生黏土矿物的生长过程严格受控于短时间的岩浆岩侵入事件,而非长时间的盆地埋藏过程。

关键词：自生黏土矿物构造热事件 Rb-Sr法定年 40Ar-39Ar法定年北部湾盆地

Real-time condition monitoring and fault diagnosis in switched reluctance motors with Kohonen neural network

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第12期14卷 941-952页

作者： Ali uysal Raif BAYiR Department of Mechatronics Engineering Faculty of TechnologyKarabuk University

The faults in switched reluctance motors(SRMs) were detected and diagnosed in real time with the Kohonen neural network. When a fault happens, both financial losses and undesired situations may occur. For these reasons, it is important to detect the incipient faults of SRMs and to diagnose which faults have occurred. in this study, a test rig was realized to determine the healthy and faulty conditions of SRMs. A data set for the Kohonen neural network was created with implemented measurements. A graphical user interface(GUi) was created in Matlab to test the performance of the Kohonen artificial neural network in real time. The data of the SRM was transferred to this software with a data acquisition card. The condition of the motor was monitored by marking the data measured in real time on the weight position graph of the Kohonen neural network. This test rig is capable of real-time monitoring of the condition of SRMs, which are used with intermittent or continuous operation, and is capable of detecting and diagnosing the faults that may occur in the motor. The Kohonen neural network used for detection and diagnosis of faults of the SRM in real time with Matlab GUi was embedded in an STM32 processor. A prototype with the STM32 processor was developed to detect and diagnose the faults of SRMs independent of computers.

关键词： Switched reluctance motor Kohonen neural network Real-time condition monitoring Fault detection and diagnosis

方解石激光原位U-Pb测年及其在海相碳酸盐岩油气勘探中的应用

在线全文

学校读者我要写书评

暂无评论

地质论评 2021年第S1期67卷 254-256页

作者：杨鹏 ZHAO Jian-xin NURiEL Perach uysal i.tonguç NGUYEN Ai Duc ZHOU Renjie FENG Yue-xing 邬光辉任战利夏斌西北大学大陆动力学国家重点实验室中国陕西西安710069 西北大学地质学系中国陕西西安710069 School of Earth and Environmental Sciences The University of QueenslandBrisbaneQLD 4072Australia Geological Survey of israel 32 Yeshayahu Leibowitz St.Jerusalem9692100Israel CSiRO Energy 26 Dick Perry AvenueKensington WA 6151Australia 西南石油大学地球与科学技术学院中国四川成都610500 中山大学海洋科学学院中国广东广州510006

我国大型海相碳酸盐岩油气田主要分布在环青藏高原盆山体系内的塔里木、鄂尔多斯和四川盆地三大多旋回叠合盆地。与国外稳定构造背景下晚期成藏的海相碳酸盐岩油气田相比,我国多旋回叠合盆地海相碳酸盐岩地层时代老、埋藏深,经历了多期... 详细信息

我国大型海相碳酸盐岩油气田主要分布在环青藏高原盆山体系内的塔里木、鄂尔多斯和四川盆地三大多旋回叠合盆地。与国外稳定构造背景下晚期成藏的海相碳酸盐岩油气田相比,我国多旋回叠合盆地海相碳酸盐岩地层时代老、埋藏深,经历了多期次成藏过程,在漫长的地质演化历史中油气藏后期改造破坏严重,成储成藏条件复杂,油气勘探难度大。

关键词：方解石原位U-Pb测年碳酸盐岩油气勘探

Co-doping of hydroxyapatite with zinc and fluoride improves mechanical and biological properties of hydroxyapatite

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials international 2014年第4期24卷 340-349页

作者： idil uysal Feride Severcan Aysen Tezcaner Zafer Evis Middle East Technical University Department of Biomedical Engineering Middle East Technical University Department of Biological Sciences Middle East Technical University Department of Engineering Sciences

Hydroxyapatite(HA) co-doped with Zn2+ tand F- ions was synthesized by precipitation method for the first time in this *** spectroscopy revealed Zn2+ tand F ions incorporation into HA ***-doping of Zn2+ tand F- ions decreased unit cell volume of HA and decreased grain ***2+ tor 5 mol% F addition into HA significantly improved its *** was increased with Zn2+ taddition and further increase was detected with F ***2+ tand F co-doped samples had higher fracture toughness than pure ***2+ tincorporation to the structure resulted in an increase in cell proliferation and ALP activity of cells,and further increase was observed with 1 mol%F *** superior mechanical properties and biological response 2Zn1 F is a good candidate for biomedical applications.

关键词： Hydroxyapatite Co-doping Microstructure Microhardness Biocompatibility

Horizontal transmission of hepatitis B virus in children with chronic hepatitis B

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第3期11卷 418-420页

作者： Tumay Doganci Gulnar uysal Tayfun Kir Arzu Bakirtas Necdet Kuyucu Levent Doganci Department of Pediatric Gastroenterology Department of Pediatric infectious Disease Department of Public Health Department of Pediatrics Clinical Microbiology

AiM: To determine the possible routes of intrafamilial transmission pattern in pediatrie cases of chronic hepatitis B virus (HBV) infection. METHODS: in this descriptive retrospective study, 302 children with chronic HBV infection from 251 families and their parents attending the Social Security Children's Hospital and Doctor Sami Ulus Children's Hopsital in Ankara between December 1998 and May 2000, were enrolled in. Screenings and diagnosis of chronic HBV infections were established according to the Consensus 2000. RESULTS: in the studied 302 children with chronic HBV infection, mothers of 38% and fathers of 23% were HBsAg positive. The HBsAg positivity in at least two siblings of the same family was 61% when both parents were HBsAg positive. CONCLUSiON: it is well known that hon'zontal transmission is quite common in countries where Hepatitis B Virus is moderately endemic. To our best knowledge, this is the largest series observed regarding the horizontal transmission in pediatrie chronic HBV infection in Turkey. it is necessary to expand the preventive programs to target not only the newborn period but also all stages of childhood.

关键词： Chronic hepatitis B Horizontal transmission

Transcutaneous cervical esophagus ultrasound in adults: Relation with ambulatory 24-h pH-monitoring and esophageal manometry

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

World Journal of Gastroenterology 2007年第39期13卷 5245-5252页

作者： Sabite Kacar Selma uysal Sedef Kuran Ulku Dagli Yasemin Ozin Erdem Karabulut Nurgul Sasmaz Gastroenterology Department Turkiye Yuksek Ihtisas Hospital Turkey Radiology Department Ankara Training and Research Hospital Turkey Biostatistics Department Hacettepe University Turkey

AiM: To determine the gastroesophageal refl uxate in the cervical esophagus (CE) and measure transcutaneous cervical esophageal ultrasound (TCEUS) f indings [anterior wall thickness (WT) of CE, esophageal luminal diameter (ELD), esophageal diameter (ED)]; to compare TCEUS findings in the patient subgroups divided according to 24-h esophageal pH monitoring and manometry; and to investigate possible cut-off values according to the TCEUS f indings as a predictor of gastroesophageal refl ux (GER). METHODS: in 45/500 patients, refl uxate was visualized in TCEUS. 38/45 patients underwent esophagogastroduo denoscopy (EGD), 24-h pH monitoring and manometry. RESULTS: The 38 patients were grouped according to 24-h pH monitoring as follows: Group A: GER-positive (n = 20) [includes Group B: isolated proximal refl ux (PR) (n = 6), Group C: isolated distal reflux (DR) (n = 6), and Group D: both PR/DR (n = 8)]; Group E: no refl ux (n = 13); and Group F: hypersensitive esophagus (HSE) (n = 5). Groups B + D indicated total PR patients (n = 14), Groups E + F refl ux-negatives with HSE (n = 18), and Groups A + F refl ux-positives with HSE (n = 25). When the 38 patients were grouped according to manometry fi ndings, 24 had normal esophageal manometry; 7 had hypotensive and 2 had hypertensive lower esophageal sphincter (LES); and 5 had ineffective esophageal motility disorder (iEM). The ELD measurement was greater in group A + F than group E (P = 0.023, 5.0 ± 1.3 vs 3.9 ± 1.4 mm). in 27/38 patients, there was at least one pathologic acid refl ux and/or pathologic manometry fi nding. The cut-off value for ELD of 4.83 mm had 79% sensitivity and 61% specificity in predicting the PRbetween Groups B + D and E (AUC = 0.775, P = 0.015). CONCLUSiON: Visualizing refluxate in TCEUS was useful as a pre-diagnostic tool for estimating GER or manometric pathology in 71.1% of adults in our study, but it was not diagnostic for CE WT.

关键词： Ambulatory 24-h pH monitoring Cervical esophageal ultrasound Gastroesophageal reflux Esophageal manometry Esophageal refluxate

土耳其西部新生代斑岩成矿岩浆氧逸度-挥发份元素组成演化特征--来自锆石和磷灰石组成约束

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

岩石学报 2021年第8期37卷 2339-2363页

作者：赵俊兴苏本勋 uysal i brahim AYDiN Faruk 肖燕 SEN Cuneyt 回凯旋秦克章中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所北京100029 中国科学院地球科学研究院北京100029 中国科学院大学地球与行星科学学院北京100049 Department of Geological Engineering Karadeniz Technical UniversityTrabzon 61080 岩石圈演化国家重点实验室中国科学院地质与地球物理研究所北京100029

特提斯成矿域中段的土耳其西部集中产出了与俯冲、碰撞-后碰撞、伸展动力学背景有关的斑岩型铜、钼、金矿床。前人已完成了针对这些斑岩型矿床构造背景的大量研究工作,但对于区内不同构造背景下斑岩型矿床的成矿岩浆源区性质、成矿元素... 详细信息

特提斯成矿域中段的土耳其西部集中产出了与俯冲、碰撞-后碰撞、伸展动力学背景有关的斑岩型铜、钼、金矿床。前人已完成了针对这些斑岩型矿床构造背景的大量研究工作,但对于区内不同构造背景下斑岩型矿床的成矿岩浆源区性质、成矿元素-挥发分含量和成矿物质演化关系尚未有系统研究。而这些研究将对认识中特提斯构造域晚白垩世以来在新特提斯洋俯冲、欧亚板块-Tauride-Anatolide板块碰撞和伸展过程中斑岩矿床形成时地壳厚度、壳幔相互作用方式及成矿物质演化过程具有重要意义。本研究选择土耳其西段三个斑岩成矿带(Tavşanl带、Biga半岛成矿带和Afyon-Konya带)内五个斑岩型矿床的成矿岩体与同期侵入岩-火山岩,开展锆石微量元素和磷灰石主量元素研究,限定碰撞与伸展环境下斑岩型矿床成矿岩浆的形成温度、氧逸度条件及其与岩浆形成时地壳厚度的关系,利用磷灰石F-Cl-S含量组成揭示熔体挥发分和硫元素的物质组成,进而约束新特提斯洋俯冲-碰撞-伸展过程中斑岩系统的深部物质演化规律。研究结果表明,土耳其西部新生代斑岩型矿床成矿岩浆锆石大部分落于高水含量-高氧逸度区间,具有相似的稀土元素标准化配分曲线。从始新世到中新世,锆石氧逸度Ce 4+/Ce 3+比值呈现出先降低(斑岩型Cu-Mo矿到斑岩型Mo矿)后升高(斑岩型Mo-Cu矿到斑岩Au矿)的趋势,且相对于斑岩型Mo矿和Mo-Cu矿,斑岩型Au矿和Cu-Mo矿成矿岩体的锆石形成时具有相对较高的氧逸度。绝大部分斑岩型矿床成矿岩体的锆石Eu N/Eu N*位于0.4~0.7之间,但斑岩型Mo矿和斑岩型Mo-Cu矿床的锆石具有相对较低的Eu N/Eu N*比值,可能是由于在结晶时熔体受斜长石结晶影响较大。锆石微量元素显示(Yb/Gd和Hf/Y-Th/U)锆石组成大部分受岩浆房中角闪石±榍石±磷灰石分离结晶控制。根据锆石Ti温度计估算土耳其西部斑岩型矿床成矿岩体及其相关岩体的形成温度在650~900℃之间,结晶温度从斑岩型Au矿、斑岩型Cu-Mo/Mo-Cu矿至斑岩型Mo矿呈现递减趋势。对于熔体的挥发分与硫含量组成,始新世-渐新世斑岩型Cu-Mo与Mo矿床成矿岩浆相对具有高F和低Cl组成,中新世伸展环境形成的斑岩型Mo-Cu矿和斑岩型Au矿床成矿岩浆Cl含量普遍较高。与成矿岩体同期的暗色包体或基性岩脉中磷灰石计算获得的熔体硫含量均大于侵入体对应熔体的硫含量,且具有不均一的含量组成,表明基性岩浆注入可能为岩浆房提供硫。结合区域动力学和地壳厚度估算,本文认为触发土耳其西部新生代斑岩矿床形成的动力学机制是:在新特提斯洋向北单向汇聚的背景下,北部始新世-渐新世斑岩矿床受控于碰撞后俯冲的新特提斯洋板片(Vardar洋)后撤-回转-断离过程;南部中新世斑岩矿床的形成则受控于爱琴海板片俯冲控制的地壳伸展-减薄过程。北侧izmir-Ankara-Erzincan缝合带附近的Tavşanl与Biga半岛斑岩成矿带始新世-渐新世斑岩型矿床的形成与熔融-同化-储存-均一过程(MASH)有关,深部地壳热区过程(DCHZ)与中新世Afyon-Konya带斑岩型矿床的形成有关。

关键词：斑岩矿床锆石微量元素岩浆氧逸度磷灰石主量元素成矿物质演化土耳其西部特提斯构造域