检索结果-南通市图书馆

“旱改水”潜力区适宜性评价研究——以雅安市汉源县为例

在线全文

学校读者我要写书评

暂无评论

国土资源科技管理 2024年第5期41卷 106-116页

作者：刘志彬邓云思李长青李军四川省国土整治中心自然资源部土地整治农用地质量与监控重点实验室四川成都611130 四川农业大学经济学院四川成都611130 四川省国土整治中心自然资源部耕地资源调查监测与保护利用重点实验室四川成都611130

“旱改水”工程能有效促进耕地占补平衡并提升耕地质量,保障区域粮食安全,本文旨在通过“旱改水”潜力区适宜性综合评价,识别研究区各乡镇“旱改水”潜力规模,分析其“旱改水”限制性因素。研究方法:以雅安市汉源县为例,基于2022年汉源... 详细信息

“旱改水”工程能有效促进耕地占补平衡并提升耕地质量,保障区域粮食安全,本文旨在通过“旱改水”潜力区适宜性综合评价,识别研究区各乡镇“旱改水”潜力规模,分析其“旱改水”限制性因素。研究方法:以雅安市汉源县为例,基于2022年汉源县土地利用年度变更调查数据,选取地形坡度、水源距离、地块规模、土层厚度、土壤酸碱度、土壤有机质含量和表层土壤质地7项评价指标,构建“旱改水”适宜性综合评价模型,评价区域“旱改水”潜力区适宜性,划分潜力区等级并分析区域“旱改水”障碍因素。研究结果:(1)汉源县耕地“旱改水”高度、中度适宜区规模较小,主要分布在汉源县东南部和北部地区;(2)各个乡镇“旱改水”潜力差异较大,一级潜力区仅有大树镇、宜东镇、皇木镇和坭美彝族乡4个乡镇;(3)基于评价因子超出指定范围所带来的限制性进行分析,识别地形坡度、地块规模和土层厚度为研究区域“旱改水”适宜性的障碍因素。研究结论:未来汉源县可通过耕地坡改梯、增施有机肥提升土壤质量和连片综合利用细化地块等方式实施“旱改水”规划。

关键词： “旱改水” 适宜性评价空间分布障碍因素

维普期刊数据库博看期刊

准谐振与有源钳位反激变换器的性能比较和分析

在线全文

学校读者我要写书评

暂无评论

电子技术应用 2024年第4期50卷 115-120页

作者：刘志斌潘永雄吴健鸿广东工业大学物理与光电工程学院广东广州510006

高频、高效和高功率密度已成为AC-DC变换器重要的设计指标。传统准谐振反激变换器因其漏感能量多借助无源电阻元件以热能形式释放,不具备ZVS特性,限制了功率密度的进一步提升,而有源钳位反激变换器能弥补准谐振反激变换器的不足。先简... 详细信息

高频、高效和高功率密度已成为AC-DC变换器重要的设计指标。传统准谐振反激变换器因其漏感能量多借助无源电阻元件以热能形式释放,不具备ZVS特性,限制了功率密度的进一步提升,而有源钳位反激变换器能弥补准谐振反激变换器的不足。先简述准谐振反激变换器与有源钳位反激变换器的工作原理,接着分析准谐振与有源钳位反激变换器主要性能指标差异,然后设计并制作两款48 W的准谐振反激变换器样机和有源钳位反激变换器样机以便获得相关的试验数据,作为性能比较分析的依据。

关键词：准谐振有源钳位反激变换器

An auxin‐responsive endogenous peptide regulates root development in Arabidopsis

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2014年第7期56卷 635-647页

作者： Fengxi Yang Yu Song Hao Yang zhibin liu Genfa Zhu Yi Yang Key Laboratory of Bio‐Resources and Eco‐Environment of Ministry of Education College of Life Sciences Sichuan University Floricultural Research Institute Guangdong Academy of Agricultural Sciences Center for Integrative Conservation Xishuangbanna Tropical Botanical Garden the Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

Auxin plays critical roles in root formation and development. The components involved in this process, however, are not well understood. Here, we newly identified a peptide encoding gene, auxin-responsive endogenous polypeptide 1 （AREP1）, which is induced by auxin, and mediates root development in Arabidopsis. Expression of AREP1 was specific to the cotyledon and to root and shoot meristem tissues. Amounts of AREP1 transcripts and AREP1-green fluorescent protein fusion proteins were elevated in response to indoleacetic acid treatment. Suppression of AREP1 through RNAi silencing resulted in reduction of primary root length, increase of lateral root number, and expansion of adventitious roots, compared to the observations in wild-type plants in the presence of auxin. By contrast, transgenic plants overexpressing AREP1 showed enhanced growth of the primary root under auxin treatment. Additionally, rootmorphology, including lateral root number and adventitious roots, differed greatly between transgenic and wildtype plants. Further analysis indicated that the expression of auxin-responsive genes, such as IAA3, IAA7, IAA17, GH3.2, GH3.3, and SAUR-AC1, was significantly higher in AREP1 RNAi plants, and was slightly lower in AREP1 overexpressing plants than in wildtype plants. These results suggest that the novel endogenous peptide AREP1 plays an important role in the process of auxinmediated root development.

关键词： Auxin response endogenous peptide root developmentCitation: Yang F, Song Y, Yang H, liu Z, Zhu G, Yang Y (2014) An auxin-responsive endogenous peptide regulates root development in

大兴安岭中南段查布其日上侏罗统玛尼吐组火山岩地质及年代学特征

在线全文

学校读者我要写书评

暂无评论

地质论评 2024年第3期70卷 996-1012页

作者：陈显婷董培培李英杰孟广安林敏王帅赵东芳刘晶晶刘志斌河北地质大学地球科学学院石家庄050031 河北地质大学河北省战略性关键矿产研究协同创新中心石家庄050031 河北地质大学蛇绿岩带成矿理论与找矿技术创新基地石家庄050031 河北省地质矿产研究中心石家庄050031 福建省地质调查研究院福州350013 中国地质大学(北京) 北京100083

通过1∶5万区域地质调查,运用“火山构造—岩性岩相—火山地层”三重填图方法,对大兴安岭中南段内蒙古查布其日地区上侏罗统玛尼吐组火山岩进行了系统的野外地质特征、岩石学、地球化学和锆石U-Pb年代学研究,分析玛尼吐组火山岩形成时... 详细信息

通过1∶5万区域地质调查,运用“火山构造—岩性岩相—火山地层”三重填图方法,对大兴安岭中南段内蒙古查布其日地区上侏罗统玛尼吐组火山岩进行了系统的野外地质特征、岩石学、地球化学和锆石U-Pb年代学研究,分析玛尼吐组火山岩形成时代和构造背景。将内蒙古查布其日地区玛尼吐组划分为2个岩性段,一段为火山碎屑沉积岩和少量中性、中酸性火山碎屑岩,二段为中性火山熔岩、火山碎屑岩和少量火山碎屑沉积岩、酸性火山碎屑岩,构成一个完整的沉积喷发旋回;划分出爆发相(碎屑流堆积相、空落堆积相)、溢流相、火山通道相、喷发—沉积相等火山岩相,并圈出4个V级火山机构。获得查布其日玛尼吐组二段安山岩的LA-ICP-MS锆石U-Pb年龄为157.8±1.4 Ma,表明其形成时代为晚侏罗世。岩石地球化学特征为,玛尼吐组二段粗安岩的SiO_(2)为64.04%~65.40%,高Al_(2)O_(3)(16.02%~16.96%),岩石富碱(K_(2)O+Na_(2)O=8.07%~8.38%),低TFe_(2)O_(3)(1.38%~4.43%),贫TiO_(2)(0.6%~0.81%),A/CNK值介于1.02~1.12之间;稀土丰度总量ΣREE为177.60×10^(-6)~254.61×10^(-6),轻、重稀土分异较明显,(La/Yb)N=8.13~12.63,具弱负Eu异常(δEu=0.71~0.78);微量元素以富集大离子亲石元素(Rb、Ba、Th、U、K)和相对亏损高场强元素(Nb、Ta、P、Ti)为特征。主量元素、微量元素地球化学特征显示查布其日玛尼吐组二段粗安岩为钾玄质岩。研究区玛尼吐组火山岩岩浆来源于伸展作用触发先前俯冲板片释放流体交代的大陆岩石圈地幔发生部分熔融,且受地壳混染影响较小,可能形成于蒙古—鄂霍次克洋造山后的伸展构造环境。

关键词：上侏罗统玛尼吐组火山作用 LA-ICP-MS锆石U-Pb定年大兴安岭蒙古—鄂霍次克洋内蒙古查布其日

粪便SDC2基因甲基化检测在广州市增城区居民结直肠癌筛查的应用研究

在线全文

学校读者我要写书评

暂无评论

中华预防医学杂志 2024年第7期58卷 1020-1028页

作者：何滟徐方芳左海军陈伟刘志彬刘泽帮陈雪珍惠庆申邹耿文蔡榛彬刘扬谭浩顺周宏锋汪建平前海人寿广州总医院结直肠肛门外科广州511330 前海人寿广州总医院健康管理中心广州511330 前海人寿广州总医院内镜中心广州511330 广州市增城区石滩镇人民政府广州511330 广州市增城区石滩镇公共卫生委员会办公室广州511330 中国医科大学肿瘤科沈阳110001 中山大学附属第六医院结直肠外科广州510630

目的探讨粪便黏结蛋白聚糖2(Syndecan-2,SDC2)基因甲基化(methylatedSDC2,mSDC2)检测在广州市城镇地区居民结直肠癌筛查的应用。方法采用横断面研究方法,于2022年7—12月期间,针对广州市增城区石滩镇40~74岁常住居民展开结直肠癌社区筛... 详细信息

目的探讨粪便黏结蛋白聚糖2(Syndecan-2,SDC2)基因甲基化(methylatedSDC2,mSDC2)检测在广州市城镇地区居民结直肠癌筛查的应用。方法采用横断面研究方法,于2022年7—12月期间,针对广州市增城区石滩镇40~74岁常住居民展开结直肠癌社区筛查。筛查人群直接进行粪便mSDC2检测,对初筛阳性者建议其接受肠镜复查,对肠镜异常者建议接受进一步治疗。观察mSDC2检测初筛的阳性率、肠镜依从率、肠道病变检出率及其临床病理特征;同时探究mSDC2检测的CT值与肠道病变恶性程度的预测关系,评估筛查成本效益。结果共计发放粪便采集装置8877份,实际回收粪便样本8189份,样本回收率92.25%,合格样本8048份,样本合格率98.28%。筛查对象中,男性3182例(39.54%),女性4866例(60.46%),年龄范围为40~74岁、平均年龄56岁。mSDC2初筛阳性率7.99%(643/8048),肠镜依从率73.10%(470/643),470例完成肠镜检查的居民中,通过病理诊断发现结直肠癌20例(4.25%),进展期腺瘤109例(23.19%),非进展期腺瘤145例(30.85%),息肉79例(16.81%),整体肠道病变检出353例,肠道病变检出率75.11%。肠道病变检出率在男性中高于女性(χ^(2)=19.200,P<0.001),各年龄组间肠道病变检出率具有明显差异,且与年龄增长呈正相关(χ^(2)=18.200,P<0.001)。检出的20例结直肠癌术后病理分期为0~Ⅰ期15例,Ⅱ~Ⅲ期4例,未知分期1例。mSDC2检测结果CT值与进展期肿瘤的比例呈负相关,差异具有统计学意义(χ^(2)=16.063,P<0.001)。本次筛查总成本433.95万元,筛查效益2850.62万元,效益成本比6.57。结论粪便mSDC2检测初筛结合肠镜精筛的结直肠癌筛查模式,具有较高的肠镜依从性和肠道病变检出率,有利于发现早期结直肠癌,具有良好的成本经济效益。粪便mSDC2检测CT值与肠道肿瘤的恶性程度可能具有相关性。

关键词：结直肠癌筛查粪便SDC2基因甲基化成本-效益分析

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2015年第5期35卷 600-605页

作者： liu zhibin Yang Jiping Acquired Immune Deficiency Syndrome Treatment and Research Center the First Affiliated Hospital of Henan University of Traditional Chinese MedicineHenan Provincial Key Laboratory of Traditional Chinese Medicine Prevention and Treatment of Viral Diseases the First Affiliated Hospital of Henan University of Traditional Chinese Medicine

Health related quality of life(HRQOL) can better reflect changes in acquired immune deficiency syndrome(AIDS) patients and inform economic evaluation of AIDS treatment services,and the assessment of HRQOL can help us to detect problems that may influence the progression of the disease,hence HRQOL has become a particularly important assessment indictor for HIV comprehensive *** a multi-angle,multi-level,and diversified complex intervention,roles of Chinese medicine(CM) in AIDS treatment have been recognized and accepted by more and more patients,and HRQOL has been widely used to evaluate the comprehensive management effects of CM on *** this article,the authors analyze the definition and measurement of HRQOL,measurement of HRQOL of HIV/AIDS patients and effects of CM on AIDS,and give some reasonable advices for the usage of the scale of *** authors hold that some new HRQOL instruments specific for CM treatment of AIDS should be developed and further prospective studies should be carried out to demonstrate the practicality,reliability and validity of HRQOL as an evaluation indictor for CM treatment of AIDS.

关键词： Acquired immune deficiency syndrome HIV Quality of life Chinese medicine traditional Anti retroviral therapy highly active

A novel steady-state productivity equation for horizontal wells in bottom water drive gas reservoirs

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2011年第1期8卷 63-69页

作者： Zhang Liehui Zhao Yulong liu zhibin State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu Sichuan 610500China School of Science Southwest Petroleum UniversityChengduSichuan 610500China

It is known that there is a discrepancy between field data and the results predicted from the previous equations derived by simplifying three-dimensional（3-D） flow into two-dimensions（2-D）.This paper presents a new steady-state productivity equation for horizontal wells in bottom water drive gas ***,the fundamental solution to the 3-D steady-state Laplace equation is derived with the philosophy of source and the Green function for a horizontal well located at the center of the laterally infinite gas ***,using the fundamental solution and the Simpson integral formula,the average pseudo-pressure equation and the steady-state productivity equation are achieved for the horizontal *** case-studies are given in the paper,the results calculated from the newly-derived formula are very close to the numerical simulation performed with the Canadian software CMG and the real production data,indicating that the new formula can be used to predict the steady-state productivity of such horizontal gas wells.

关键词： Horizontal well point-source function bottom water driver gas reservoir steady-state productivity

Antifertility effects of EP-1 (quinestrol and levonorgestrel) on Pacific rats (Rattus exulans)

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2024年第1期19卷 127-142页

作者： Jing liu Feiyun TU Ming liu Jichao WANG zhibin ZHANG Ministry of Education Key Laboratory for Ecology of Tropical Islands Key Laboratory of Tropical Animal and Plant Ecology of Hainan ProvinceCollege of Life SciencesHainan Normal UniversityHaikouHainanChina Secretariat Office International Society of Zoological Science and Society and Journal OfficeInstitute of ZoologyChinese Academy of SciencesBeijingChina State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijingChina CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijingChina

Pest rodents pose a serious threat to island *** control could be an alternative approach to control the impact of rodents on these *** this study,we examined the antifertility effects of EP-1 baits containing quinestrol(E)and levonorgestrel(P)using a dose of 50 ppm E and P at three different ratios(E:P ratio=1:2,1:1,and 2:1)on Pacific rats(Rattus exulans)in the Xisha Islands,Hainan,*** to the control group,all animals in EP-1 treatment groups showed significantly decreased food intake and body *** treated males,there were obvious abnormalities in testis structure and a significant decrease of relative seminal vesicle weight,but no significant effect on relative uterine and ovarian weights(g kg-1 body weight),or ovarian structure in *** 8%sucrose to the original 50-ppm baits(E:P ratio=1:1)significantly increased bait palatability for males and *** dose induced uterine edema and abnormalities of ovarian structure in females but had no significant negative effect on the relative testis,epididymis,and seminal vesicle weights(g kg-1 body weight)or sperm density in *** summary,50-ppm EP-1(1:1)baits have the potential to disrupt the fertility of females,and 8%sucrose addition to the EP-1 baits(E:P ratio=1:1)could improve bait *** dose disrupted the testis structure in *** studies are needed to improve bait acceptance and assess the antifertility effects of EP-1(1:1)on Pacific rats in captive breeding trials and underfield conditions.

关键词： EP-1 fertility control island biodiversity conservation levonorgestrel quinestrol Rattus exulans

Exposure to Fipronil Insecticide in the Sixth Total Diet Study-China,2016-2019

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

China CDC weekly 2022年第9期4卷 185-189,I0009-I0011页

作者： zhibin liu Dawei Chen Bing Lyu Jingguang Li Yunfeng Zhao Yongning Wu NHC Key Laboratory of Food Safety Risk Assessment Chinese Academy of Medical Science Research Unit(No.2019RU014)China National Center for Food Safety Risk AssessmentBeijingChina Nanchang Key Laboratory of Detection and Control of Food Safety Nanchang Inspection and Testing CenterNanchangJiangxi ProvinceChina

Summary What is already known about this topic?Fipronil is classified as a“possible human carcinogen”by the United States Environmental Protection ***-term exposure to fipronil may cause damage to liver,thyroid,and ***,fipronil and its metabolites are ubiquitous in the environment and *** is added by this report?The dietary intake of fipronil in China was within acceptable levels with low health *** were the main dietary intake contributor of fipronil for Chinese adult populations(55.3%),followed by vegetables(30.7%),meats(5.90%),cereals(5.30%),and other food categories contributed less than 2%.What are the implications for public health practice?The study results will help health managers understand the health risk of fipronil,and help to better formulate monitoring plans in *** is still necessary to strengthen the monitoring of fipronil in foods,especially animal-derived foods.

关键词： cereal intake nil