检索结果-南通市图书馆

Stable carbon isotope composition and intrinsic water use efficiency in plants along an altitudinal gradient on the eastern slope of Yulong Snow Mountain, China

引用

Ecological Processes 2024年第2期13卷 218-230页

作者： Feng Jiang Tao Pu Zi-Jing Xue Yan-Wei Ma xiao-Yi shi Fu-xi shi College of Geography and Environmental Sciences Zhejiang Normal University Yulong Snow Mountain Glacier and Environment Observation and Research Station/State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of Forestry Jiangxi Agricultural University

Background Stable carbon isotope composition(δ13Cp) can be used to estimate the changes in intrinsic water use efficiency（iWUE） in plants,which helps us to better understand plants' response strategies to climate *** study focused on the variations in δ13Cpand iWUE for the different life-form plants（i.e.,herbs,shrubs,and trees）along an altitudinal gradient（3300,3600,3900,4100,4300,and 4500 m） on the eastern slope of Yulong Snow Mountain,southeastern margin of the Qinghai-Tibet *** response mechanisms of δ13Cpand iWUE for different life-form plants to altitude were thoroughly analyzed in this mountain *** The δ13Cpvalues of plants on the eastern slopes of Yulong Snow Mountain ranged from-30.4‰to-26.55‰,with a mean of-28.02‰,indicating a dominance of *** δ13Cpand iWUE values varied among different life-form plants in the order of herbs> shrubs> trees,particularly in 3600,3900,and 4300 ***δ13Cpand iWUE values for herbs and shrubs increased with altitude and were mainly controlled by air *** two parameters for trees exhibited a trend of initial decrease followed by an increase with *** 3900 m,the δ13Cpand iWUE values decreased with altitude,influenced by soil ***,above 3900 m,the two parameters increased with altitude,mainly regulated by air *** addition,iWUE was positively correlated with leaf P content but negatively correlated with leaf N:P ratio,especially for herbs and trees,suggesting that P plays a key role in modulating iWUE in this *** The diffe rentiated responses of water availability for different life-form plants to a higher altitudinal gradient are regulated by air temperature,soil moisture,and leaf P content in the Yulong Snow *** results provide valuable insights into understanding the wate r-carbon relationships in high-altitude ecosystems.

关键词： Stable carbon isotope Water use efficiency Altitude Life form Yulong Snow Mountain

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Experimental investigation of dynamic characteristics of leaching tubing for solution mining of salt cavern carbon and energy storage

引用

Petroleum Science 2024年第4期21卷 2703-2722页

作者： Yin-Ping Li xin-Bo Ge xi-Lin shi Hong-Ling Ma State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences University of Chinese Academy of Sciences College of Energy and Mining Engineering Shandong University of Science and Technology State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology

Salt caverns are extensively utilized for storing various substances such as fossil energy, hydrogen,compressed air, nuclear waste, and industrial solid waste. In China, when the salt cavern is leached through single-well water solution mining with oil as a cushion, engineering challenges arise with the leaching tubing, leading to issues like damage and instability. These problems significantly hinder the progress of cavern construction and the control of cavern shape. The primary cause of this is the flowinduced vibration instability of leaching tubing within a confined space, which results in severe bending or damage to the tubing. This study presents a model experimental investigation on the dynamic characteristics of leaching tubing using a self-developed liquid-solid coupling physical model experiment apparatus. The experiment utilizes a silicone-rubber pipe(SRP) and a polycarbonate pipe(PCP) to examine the effects of various factors on the dynamic stability of cantilevered pipes conveying fluid. These factors include external space constraint, flexural rigidity, medium outside the pipe, overhanging length, and end conditions. The experiments reveal four dynamic response phenomena: water hammer, static buckling, chaotic motion, and flutter instability. The study further demonstrates that the length of the external space constraint has a direct impact on the flutter critical flow velocity of the cantilevered pipe conveying fluid. Additionally, the flutter critical flow velocity is influenced by the end conditions and different external media.

关键词： Salt cavern storage Solution mining Leaching tubing Experimental investigation Flutter instability

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Remote sensing image encryption algorithm based on novel hyperchaos and an elliptic curve cryptosystem

引用

Chinese Physics B 2024年第5期33卷 292-304页

作者：田婧希金松昌张晓强杨绍武史殿习 School of Computer Science National University of Defense TechnologyChangsha 410003China Intelligent Game and Decision Laboratory (IGDL) Beijing 100091China School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China

Remote sensing images carry crucial ground information,often involving the spatial distribution and spatiotemporal changes of surface *** safeguard this sensitive data,image encryption technology is *** this paper,a novel Fibonacci sine exponential map is designed,the hyperchaotic performance of which is particularly suitable for image encryption *** encryption algorithm tailored for handling the multi-band attributes of remote sensing images is *** algorithm combines a three-dimensional synchronized scrambled diffusion operation with chaos to efficiently encrypt multiple ***,the keys are processed using an elliptic curve cryptosystem,eliminating the need for an additional channel to transmit the keys,thus enhancing *** results and algorithm analysis demonstrate that the algorithm offers strong security and high efficiency,making it suitable for remote sensing image encryption tasks.

关键词： hyperchaotic system elliptic curve cryptosystem(ECC) 3D synchronous scrambled diffusion remote sensing image unmanned aerial vehicle(UAV)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Andrographolide Attenuates Noise-Induced Hearing Loss by Ameliorating Cochlear Inflammation

引用

World Journal of Traditional Chinese Medicine 2024年第2期10卷 204-212页

作者： Meng-Hua Li Wan-Qi Wang Li-Ting Zheng Meng Bing Chen Yang Chu Miao Qiao Zuo-Li Zhang Konduru Naveena Yong Pan Yun-shi Zhang He Sun xiao-Hui Ma xi shi Artificial Auditory Laboratory of Jiangsu Province Xuzhou Medical UniversityXuzhouChina Key Laboratory of Tropical Biological Resources of Ministry of Education School of Pharmaceutical SciencesHainan UniversityHaikouChina Department of ENT Beijing Friendship HospitalCapital Medical UniversityBeijingChina National Key Laboratory of Chinese Medicine Modernization Tasly AcademyTasly Pharmaceutical Group Co.Ltd.TianjinChina Endoscopy Center Ankang People's HospitalAnkangChina Department of Respiratory Medicine Xuzhou Infectious Diseases HospitalAffiliated Hospital of Xuzhou Medical UniversityXuzhouChina Department of ENT The People's Hospital of Rongchang DistrictChongqingChina

Objective:This study aimed to explore andrographolide's mechanism of action and its protective effect on noise-induced hearing loss(NIHL).Materials and Methods:A mice animal model for NIHL was established through exposure to broadband noise at 120 d B sound pressure level for 4 *** analysis and pharmacodynamic experiments were carried ***:Andrographolide enters the inner ear and effectively prevents hearing damage following noise exposure in the mice model for permanent hearing ***,treatment with andrographolide inhibited the excessive activation of inflammatory factors in the cochleae of noise-exposed ***:Andrographolide might be a promising candidate for auditory protective drug investigation.

关键词： Andrographolide anti-inflammatory auditory protection noise-induced hearing loss traditional Chinese medicine compound

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tranylcypromine upregulates Sestrin 2 expression to ameliorate NLRP3-related noise-induced hearing loss

引用

Neural Regeneration Research 2025年第5期20卷 1483-1494页

作者： xihang Chen Zhifeng Chen Menghua Li Weiwei Guo Shuolong Yuan Liangwei Xu Chang Lin xi shi Wei Chen shiming Yang Senior Department of Otolaryngology Head and Neck Surgery Chinese PLA General HospitalChinese PLA Medical SchoolBeijingChina State Key Laboratory of Hearing and Balance Science BeijingChina National Clinical Research Center for Otolaryngologic Diseases BeijingChina Key Laboratory of Hearing Science Ministry of EducationBeijingChina Beijing Key Laboratory of Hearing Impairment Prevention and Treatment BeijingChina Department of Otorhinolaryngology Head and Neck Surgery The First Affiliated Hospital of Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Otolaryngology Head and Neck Surgery The 940th Hospital of Joint Logistics Support Force of Chinese PLALanzhouGansu ProvinceChina Key Laboratory of Tropical Biological Resources of Ministry of Education School of Pharmaceutical SciencesHainan UniversityHaikouHainan ProvinceChina Academician Workstation of Hainan University School of Pharmaceutical SciencesYazhou BaySanyaHainan ProvinceChina

Noise-induced hearing loss is the primary non-genetic factor contributing to auditory ***,there are currently no effective pharmacological interventions for patients with noise-induced hearing ***,we present evidence suggesting that the lysine-specific demethylase 1 inhibitor–tranylcypromine is an otoprotective agent that could be used to treat noise-induced hearing loss,and elucidate its underlying regulatory *** established a mouse model of permanent threshold shift hearing loss by exposing the mice to white broadband noise at a sound pressure level of 120 d B for 4 *** found that tranylcypromine treatment led to the upregulation of Sestrin2(SESN2)and activation of the autophagy markers light chain 3B and lysosome-associated membrane glycoprotein 1 in the cochleae of mice treated with *** noise exposure group treated with tranylcypromine showed significantly lower average auditory brainstem response hearing thresholds at click,4,8,and 16 k Hz frequencies compared with the noise exposure group treated with *** findings indicate that tranylcypromine treatment resulted in increased SESN2,light chain 3B,and lysosome-associated membrane glycoprotein 1 expression after noise exposure,leading to a reduction in levels of 4-hydroxynonenal and cleaved caspase-3,thereby reducing noise-induced hair cell ***,immunoblot analysis demonstrated that treatment with tranylcypromine upregulated SESN2 expression via the autophagy *** treatment also reduced the production of NOD-like receptor family pyrin domaincontaining 3(NLRP3)*** conclusion,our results showed that tranylcypromine treatment ameliorated cochlear inflammation by promoting the expression of SESN2,which induced autophagy,thereby restricting NLRP3-related inflammasome signaling,alleviating cochlear hair cell loss,and protecting hearing *** findings suggest that inhibiting lysine-specific demethylase 1 is a

关键词： 4-hydroxynonenal apoptosis autophagy cleaved caspase-3 inflammation NOD-like receptor family pyrin domain-containing 3(NLRP3) noise-induced hearing loss oxidative stress Sestrin2 tranylcypromine

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

大学生社交网络用户健康焦虑自我披露意愿的影响因素研究

引用

情报科学 2024年第3期42卷 33-42,51页

作者：王琳李云婧施茜杭州电子科技大学中国科教评价研究院浙江杭州310018 中国农业银行股份有限公司北京市分行北京100027 杭州电子科技大学管理学院浙江杭州310018

【目的/意义】本文以大学生健康焦虑群体为例,研究其作为社交网络用户的健康焦虑自我披露意愿影响因素,能够丰富健康信息披露研究,有助于心理健康信息服务方和社交网络平台更有针对性地提供帮助与服务,缓解其健康焦虑。【方法/过程】采... 详细信息

【目的/意义】本文以大学生健康焦虑群体为例,研究其作为社交网络用户的健康焦虑自我披露意愿影响因素,能够丰富健康信息披露研究,有助于心理健康信息服务方和社交网络平台更有针对性地提供帮助与服务,缓解其健康焦虑。【方法/过程】采用质性研究法,对20名患有健康焦虑的大学生社交网络用户进行半结构化访谈,使用扎根理论对访谈资料进行分析,将提炼出的意愿影响因素与文献调研结果相结合,构建出概念模型,采用问卷调查法收集数据,使用层次回归分析检验模型。【结果/结论】对有健康焦虑的大学生社交网络用户而言,信任程度、感知收益和健康焦虑水平均正向影响健康焦虑自我披露意愿,感知风险负向影响健康焦虑自我披露意愿。父母健康焦虑披露水平正向调节感知收益与健康焦虑自我披露意愿之间的关系。根据实证研究结果,提出了相应的对策与建议。【创新/局限】揭示了健康焦虑自我披露意愿影响因素与产生机制。研究主要是在新冠疫情“乙类甲管”防控阶段进行的,没有对转入常态化防控阶段之后健康焦虑的自我披露意愿进行前后比较。

关键词：大学生社交网络用户健康焦虑自我披露意愿扎根理论层次回归分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

融合星载LiDAR系统GEDI数据与Sentinel-2影像的长江中游洲滩典型禾本科植物高度动态研究

引用

湖泊科学 2024年第2期36卷 562-574页

作者：石希夏军强周美蓉辛沛武汉大学水资源工程与调度全国重点实验室武汉430072 河海大学水灾害防御全国重点实验室南京210098

植物是大型河流生态系统的重要成分。但受气候变化和人类活动影响,洲滩禾本科植物高度不断发生调整,进而影响洲滩生境和河道防洪安全,故需长期监测。近年来,伴随着星载激光雷达(LiDAR)技术的发展,应用LiDAR卫星数据反演洲滩禾本科植物... 详细信息

植物是大型河流生态系统的重要成分。但受气候变化和人类活动影响,洲滩禾本科植物高度不断发生调整,进而影响洲滩生境和河道防洪安全,故需长期监测。近年来,伴随着星载激光雷达(LiDAR)技术的发展,应用LiDAR卫星数据反演洲滩禾本科植物高度成为一种可能。本文融合新一代星载LiDAR系统GEDI数据与Sentinel-2影像,基于XGBoost算法构建了考虑物候、累积温度与光合有效辐射指标的洲滩典型禾本科植物高度外推模型,同时利用Attention-UNet算法搭建了洪淹区域识别模型。随后以长江中游洲滩为例,探明了星载LiDAR技术在获取洲滩植株高度方面的性能,分析了各指标对模型精度的影响,并初步得出了洲滩典型禾本科植物高度对不同淹没条件的响应模式。主要结论包括:(1)星载LiDAR系统GEDI具有准确探测洲滩植物高度的能力,与无人机航测数据相比RMSE=0.43 m;(2)运用GEDI数据构建禾本科植物高度外推模型时,考虑物候和累积温度等指标可有效提升模型精度,提升幅度为6.8%~10.7%;(3)利用无人机航测数据对模型外推植物高度进行评价,RMSE=0.80 m。同时从模型外推结果中可知,受2020年流域尺度洪水影响,中游各河段平均植物高度下降了0.03~0.24 m;(4)在2020年流域尺度洪水作用下,淹没历时≤10天的洲滩禾本科植物,其次年株高整体呈增长趋势;而淹没历时>10天时,其次年株高平均下降了2.3%~3.1%。此外,对于日均淹没水深与株高的比值>0.95的洲滩,随着比值增加,洪水对禾本科植株高度的负面作用逐步增强。

关键词：星载激光雷达 GEDI 植被高度长江中游洲滩

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

新能源汽车专业健全安全保障体系的教改探索

引用

时代汽车 2024年第15期 28-30页

作者：史茜江苏工程职业技术学院江苏南通226007

2020年国务院办公厅引发《新能源汽车产业发展规划(2021-2035)》中提高要健全安全保障体系,高职院校是培养高技能人才的重要源泉,但目前国内高职院校新能源汽车专业对于新能源汽车安全保障体系的教学存在不足,本文通过实际调研,理论分... 详细信息

2020年国务院办公厅引发《新能源汽车产业发展规划(2021-2035)》中提高要健全安全保障体系,高职院校是培养高技能人才的重要源泉,但目前国内高职院校新能源汽车专业对于新能源汽车安全保障体系的教学存在不足,本文通过实际调研,理论分析及试验等方法,提供了高职院校新能源汽车专业安全保证体系教学改革理论基础及部分实践结果。

关键词：高职教育新能源安全教改

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

河道斜交桥梁壅水及流场特性分析

引用

泥沙研究 2024年第2期49卷 64-71页

作者：石喜谭春彬贡力陶虎兰州交通大学土木工程学院甘肃兰州730070

圆端桥墩是平原河道内一种常见的桥墩型式,为探究斜交圆端桥墩不同布置方式引起的壅水特性和水流流态变化,建立三维数值模型,采用SIMPLE算法耦合k-ε紊流模型求解N-S方程组,应用VOF法追踪自由液面,分析了单个桥墩壅水特性、绕流流场和... 详细信息

圆端桥墩是平原河道内一种常见的桥墩型式,为探究斜交圆端桥墩不同布置方式引起的壅水特性和水流流态变化,建立三维数值模型,采用SIMPLE算法耦合k-ε紊流模型求解N-S方程组,应用VOF法追踪自由液面,分析了单个桥墩壅水特性、绕流流场和升阻力系数随斜交角度变化的规律。研究结果表明:下游墩前壅水高度最大,壅水长度最长,上游墩前冲高值最大;水流绕流经过上游桥墩后偏向下游桥墩侧,桥墩垂直桥轴线布置方式绕流形成的壅水叠加效应更明显;斜交桥梁布置采取圆端桥墩时,桥墩顺水流布置,可有效减小阻水宽度与壅水高度,弱化流场结构变化。

关键词：斜交桥数值模拟圆端桥墩布置方式壅水流场

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

息肉状子宫内膜异位症中纤维化程度和雌孕激素受体的表达及临床意义

引用

复旦学报（医学版） 2024年第5期51卷 757-764,771页

作者：易云华刘惜时聂姬婵复旦大学附属妇产科医院妇科上海200011

目的探讨息肉状子宫内膜异位症的纤维化程度、雌孕激素表达及血管生成相关分子的表达,进一步了解其组织病理学特征。方法回顾分析复旦大学附属妇产科医院2014年4月至2020年8月经手术治疗且病理诊断为息肉状子宫内膜异位症的42例患者的... 详细信息

目的探讨息肉状子宫内膜异位症的纤维化程度、雌孕激素表达及血管生成相关分子的表达,进一步了解其组织病理学特征。方法回顾分析复旦大学附属妇产科医院2014年4月至2020年8月经手术治疗且病理诊断为息肉状子宫内膜异位症的42例患者的临床病理资料,并收集病理确诊的19例卵巢内膜样囊肿、20例子宫腺肌病、20例深部内异症、20例子宫内膜息肉患者的病灶组织作为对照组,使用Masson染色及免疫组化染色测定各组病灶的纤维化程度、雌孕激素受体表达及血管生成相关分子的表达情况。结果42例息肉状子宫内膜异位症患者的平均发病年龄为41.24岁,最常见的临床表现为盆腔肿块(24例)。免疫组化显示:息肉状子宫内膜异位症与卵巢内膜样囊肿、子宫腺肌病、深部子宫内膜异位症相比,子宫内膜异位相关疾病纤维化程度较低;但与子宫内膜息肉相比,息肉状子宫内膜异位症纤维化程度显著增加。雌激素受体β(estrogen receptor-β,ER-β)表达上升,孕激素受体同工酶B(progesterone receptor B,PR-B)表达下调,血管密度较高。结论息肉状子宫内膜异位症是一种纤维化程度较低、雌激素受体表达水平较高、血供较为丰富的一种特殊亚型的内异症,预后一般良好。

关键词：息肉状子宫内膜异位症子宫腺肌病子宫内膜异位症免疫组化纤维化

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：