检索结果-南通市图书馆

The PMIP3 Simulated Climate Changes over Arid Central Asia during the Mid-Holocene and Last Glacial Maximum

Acta Geologica Sinica(English Edition) 2020年第3期94卷 725-742页

作者： XU Hongna WANG Tao WANG Huijun MIAO Jiapeng chen Jianhui chen Shengqian Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China Climate Change Research Center Chinese Academy of SciencesBeijing 100029China Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Meteorological Disaster Nanjing University of Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100029China Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China

In this study, the climate changes over Arid Central Asia(ACA) during the mid-Holocene(approximately 6,000 calendar years ago, MH) and the Last Glacial Maximum(approximately 21,000 calendar years ago, LGM) were investigated using multimodel simulations derived from the Paleoclimate Modelling Intercomparison Project Phase 3(PMIP3). During the MH, the multimodel median(MMM) shows that in the core region of ACA, the regionally averaged annual surface air temperature(SAT) decreases by 0.13°C and annual precipitation decreases by 3.45%, compared with the preindustrial(PI) climate. The MMM of the SAT increases by 1.67/0.13°C in summer/autumn, whereas it decreases by 1.23/1.11°C in spring/winter. The amplitude of the seasonal cycles of the SAT increases over ACA due to different MH orbital parameters. For precipitation, the regionally averaged MMM decreases by 5.77%/5.69%/0.39%/5.24% in spring/summer/autumn/winter, respectively. Based on the analysis of the aridity index(AI), compared with the PI, a drier climate appears in southern Central Asia and western Xinjiang due to decreasing precipitation. During the LGM, the MMM shows that the regionally averaged SAT decreases by 5.04/4.36/4.70/5.12/5.88°C and precipitation decreases by 27.78%/28.16%/31.56%/27.74%/23.29% annually and in the spring, summer, autumn, and winter, respectively. Robust drying occurs throughout almost the whole core area. Decreasing precipitation plays a dominant role in shaping the drier conditions, whereas strong cooling plays a secondary but opposite role. In response to the LGM external forcings, over Central Asia and Xinjiang, the seasonal cycle of precipitation has a smaller amplitude compared with that under the PI climate. In the model-data comparison, the simulated MH moisture changes over ACA are to some extent consistent with the reconstructions, further confirming that drier conditions occurred during that period than during the PI.

关键词： PMIP3 climate changes Arid Central Asia mid-Holocene Last Glacial Maximum

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

Analysis of environmental selection pressure of superoxide dismutase in deep-sea sea cucumber

引用

Journal of Oceanology and Limnology 2024年第3期42卷 893-904页

作者： Yanan LI Zongfu chen Haibin ZHANG Ruoyu LIU Shuichun chen Li LIN Guangzhou Key Laboratory of Aquatic Animal Diseases and Waterfowl Breeding College of Animal Sciences and TechnologyZhongkai University of Agriculture and EngineeringGuangzhou 510222China Institute of Deep-sea Science and Engineering Chinese Academy of SciencesSanya 572000China College of Marine Science Fujian Agriculture and Forestry UniversityFuzhou 350002China Zhanjiang Tianli Sea Cucumber New Technology Development Co. Ltd.Zhanjiang 524000China

Manganese superoxide dismutase(MnSOD)is an antioxidant that exists in mitochondria and can effectively remove superoxide anions in *** a dark,high-pressure,and low-temperature deep-sea environment,MnSOD is essential for the survival of sea *** MnSODs were identified from the transcriptomes of deep and shallow-sea sea *** explore their environmental adaptation mechanism,we conducted environmental selection pressure analysis through the branching site model of PAML *** obtained night positive selection sites,and two of them were significant(97F→H,134K→V):97F→H located in a highly conservative characteristic sequence,and its polarity c hange might have a great impact on the function of MnSOD;134K→V had a change in piezophilic a bility,which might help MnSOD adapt to the environment of high hydrostatic pressure in the *** further study the effect of these two positive selection sites on MnSOD,we predicted the point mutations of F97H and K134V on shallow-sea sea cucumber by using MAESTROweb and *** show that 97F→H,134K→V might improve MnSOD’s efficiency of scavenging superoxide a nion and its ability to resist high hydrostatic pressure by moderately reducing its *** above results indicated that MnSODs of deep-sea sea cucumber adapted to deep-sea environments through their amino acid changes in polarity,piezophilic behavior,and local *** study revealed the correlation between MnSOD and extreme environment,and will help improve our understanding of the organism’s adaptation mechanisms in deep sea.

关键词： Holothuroidea environmental adaptation positive selection point mutation

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

Dopamine-mimetic-coated polyamidoamine-functionalized Fe_(3)O_(4) nanoparticles for safe and efficient gene delivery

引用

Frontiers of Materials Science 2023年第1期17卷 141-152页

作者： Liang Liu Chaobing Liu Zhaojun Yang Yiran chen Xin chen Jintao Guan College of Life Science and Technology Wuhan Polytechnic UniversityWuhan 430023China College of Chemistry and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China

Fe_(3)O_(4) nanoparticles(NPs)are widely used in the construction of drug and gene delivery vectors because of their particular physicochemical *** modification can not only reduce the cytotoxicity of Fe_(3)O_(4),but also further improve the biocompatibility and delivery *** this work,firstly,polydopamine(PDA)-coated Fe_(3)O_(4) NPs(named Fe_(3)O_(4)@PDA)were prepared by using the self-polymerization characteristics of dopamine in alkaline ***,polyamidoamine(PAMAM)was modified by the Michael addition reaction to prepare water-soluble core shell magnetic NPs of Fe_(3)O_(4)@PDA@PAMAM,and its potential as gene vector was further *** results revealed that Fe_(3)O_(4)@PDA@PAMAM had the ability to condense and protect DNA,and showed lower cytotoxicity,higher cell uptake and transfection efficiency than those of *** has the potential to become a magnetic targeted gene vector for further study.

关键词： gene vector nanoparticle polydopamine gene transfection

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

Chinese Medicine as Supporting Therapy for Psoriasis:Past,Present,and Future

引用

Chinese Journal of Integrative Medicine 2023年第3期29卷 280-288页

作者： YANG Xue-yuan CAI Wan-ling GUO chen-lu chen Qi-hua Department of Andrology The First Affiliated Hospital of Hunan University of Chinese MedicineChangsha(410007)China Post-graduate School Hunan University of Chinese MedicineChangsha(410208)China Department of Dermatology Shuguang HospitalShanghai University of Chinese MedicineShanghai(201203)China

Psoriasis is a chronic skin disease and an important health *** medicine and therapies are the main treatment strategies for psoriasis vulgaris(PV);however,the overall prognosis of patients with PV is still ***,PV prevention is especially *** medicine(CM)has a long history of treating psoriasis,and it has unique wisdom in different cognitive angles and treatment modes from modern *** this review,we first summarized the herbs and ancient CM formulas that have therapeutic effects on ***,the research status and obstacles to the current development of CM in modern medicine were ***,the future of CM in the context of precision medicine and integrated medicine was *** a detailed reading of the abundant literature,we believe that CM,through thousands of years of continuous development and clinical practice,has achieved high effectiveness and safety for PV treatment,despite its surrounding ***,precise analyses and systematic research methods have provided new approaches for the modernization of CM in the *** treatment of PV with CM is worth popularizing,and we hope it can benefit more patients.

关键词： Chinese medicine psoriasis vulgaris molecular mechanism network pharmacology Chinese herbal medicine

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

A 3-DIMENSIONAL DISCRETE MODEL OF HOUSING PRICE AND ITS INHERENT COMPLEXITY ANALYSIS

引用

Journal of Systems Science & Complexity 2009年第3期22卷 415-421页

作者： Lingling MU Junhai MA Liwen chen School of Managernent Hebei University of Technology Tianjin 300130 China School of Management TianjinUniversity Tianjin 300072 China. School of Management Tianjin University Tianjin 300072 China School of Management Hebei University of Technology Tianjin 300130 China.

A discrete nonlinear model of real estate is derived,with which the evolutionary trendamong government,consumers and real estate developers is *** stability,bifurcation,andchaotic behavior of the system are also analyzed by using nonlinear dynamic *** show thatchaos can be obtained via quasi-periodic transition and double-periodic *** influence ofdynamic evolutionary trend among stakeholder on system stability is also studied and some interestingconclusions are *** research can effectively explain the complex behavior of housing prices.

关键词： Bifurcation chaos discrete dynamical system housing price.

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

Phase precision of Mach–Zehnder interferometer in PM2.5 air pollution

引用

Chinese Physics B 2018年第7期27卷 207-213页

作者： Duan Xieand Haifeng chen School of Electronic Engineering Xi＇ an University of Posts and TelecommunicationsXi＇an 710121China

This paper theoretically explores the effect of PM2.5 air pollution on the phase precision of a Mach-Zehnder inter- ferometer. With the increasing of PM2.5 concentration, phase precision for inputs of coherent state ＆ vacuum state and inputs of coherent state ＆ squeezed vacuum state will gradually decrease and be lower than the standard quantum limit. When the value of relative humidity is increasing, the precision of two input cases is decreasing much faster. We also find that the precision for inputs of coherent state ＆ squeezed state is better than that of coherent state ＆ vacuum state when PM2.5 concentration is lower. As PM2.5 concentration increases, the precision for inputs of coherent state ＆ squeezed state decreases faster, and then the two precisions tend to be the same while the concentration is higher.

关键词： Mach-Zehnder interferometer PM2.5 phase precision

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

Maximum Power Point Tracking With Fractional Order High Pass Filter for Proton Exchange Membrane Fuel Cell

引用

IEEE/CAA Journal of Automatica Sinica 2017年第1期4卷 70-79页

作者： Jianxin Liu Tiebiao Zhao YangQuan chen School of Mechanical Engineering Xihua University University of California

Proton exchange membrane fuel cell (PEMFC) is widely recognized as a potentially renewable and green energy source based on hydrogen. Maximum power point tracking (MPPT) is one of the most important working conditions to be considered. In order to improve the performance such as convergence and robustness under disturbance and uncertainty, a fractional order high pass filter (FOHPF) is applied for the MPPT controller design based on the traditional extremum seeking control (ESC). The controller is designed with integerorder integrator (IO-I) and low pass filter (IO-LPF) together with fractional order high pass filter (FOHPF), by substituting the normal HPF in the original ESC system. With this FOHPF ESC, better convergence and smoother performance are achieved while maintaining the robust specifications. First, tracking stability is discussed under the commensurate-order condition. Then, simulation results are included to validate the proposed new FOHPF ESC scheme under disturbance. Finally, comparison results between FOHPF ESC and the traditional ESC method are also provided. © 2014 Chinese Association of Automation.

关键词： Bandpass filters Control theory Controllers Fuel cells High pass filters Low pass filters Maximum power point trackers

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

Radiation induced decomposition of a refractory cefathiamidine intermediate

引用

Journal of Environmental Sciences 2014年第12期26卷 2406-2411页

作者： Qiburi Bao Lujun chen Jianlong Wang School of Environment Tsinghua University Zhejiang Provincial Key Laboratory of Water Science and Technology Institute of Nuclear and New Energy Technology Tsinghua University

Diisopropylthiourea（DPT）, an intermediate of a widely used cephalosporin, has been found to be one of the most refractory components in cephalosporin synthesis *** compound cannot be completely removed by conventional biological processes due to its antimicrobial property. Ionizing radiation has been applied in the decomposition of refractory pollutants in recent years and has proved effective. Therefore, the decomposition of DPT by γ-irradiation was studied. The compound was irradiated at the dose of 150–2000 Gy before a change of concentration and UV absorption of the solutions was ***, the decomposition kinetics and radiation yield（G-value） of DPT was investigated. The results of radiation experiments on DPT-containing aqueous showed that the DPT can be effectively degraded by γ-radiation. DPT concentration decreased with increasing absorbed doses. G-values of radiolytic decomposition for DPT（20 mg/L） were 1.04 and 0.47 for absorbed doses of 150 and 2000 Gy, respectively. The initial concentration and p H of the solutions affected the degradation. As the concentration of substrate increased,the decomposition was reduced. The decrease of removal rate and radiation efficacy under alkaline condition suggested that lower p H values benefit the γ-induced degradation. UV absorption from 190 to 250 nm decreased after radiation while that from 250 to 300 nm increased, indicating the formation of by-products.

关键词： Decomposition Diisopropylthiourea Ionizing radiation Wastewater

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

Rhizosphere Aeration Improves Nitrogen Transformation in Soil, and Nitrogen Absorption and Accumulation in Rice Plants

引用

Rice science 2020年第2期27卷 162-174页

作者： XU Chunmei chen Liping chen Song CHU Guang WANG Danying ZHANG Xiufu China National Rice Research Institute Chinese Academy of Agricultural SciencesHangzhou 310006China

Two rice cultivars(Xiushui 09 and Chunyou 84)were used to evaluate the effects of various soil oxygen(O2)conditions on soil nitrogen(N)transformation,absorption and accumulation in rice *** treatments were continuous flooding(CF),continuous flooding and aeration(CFA),and alternate wetting and drying(AWD).The results showed that the AWD and CFA treatments improved soil N transformation,rice growth,and N absorption and *** NO3–content,nitrification activity and ammonia-oxidising bacteria abundance,leaf area,nitrate reductase activity,and N absorption and accumulation in rice all increased in both ***,soil microbial biomass carbon and pH did not significantly change during the whole period of rice *** analysis revealed a significant positive correlation between the nitrification activity and ammonia-oxidising bacteria abundance,and both of them significantly increased as the total N accumulation in rice *** results indicated that improved soil O2 conditions led to changing soil N cycling and contributed to increases in N absorption and accumulation by rice in paddy fields.

关键词： ammonium-nitrogen content nitrate-nitrogen content nitrification activity nitrate reductase activity rhizosphere oxygen condition ammonia-oxidising bacteria abundance rice nitrogen use efficiency

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

小针刀联合经颅磁刺激治疗脑梗死后遗症期上肢痉挛的疗效观察

引用

中医康复 2025年第1期2卷 18-22页

作者：文锦陈南萍南昌大学附属康复医院江西南昌330003

目的:研究小针刀联合经颅磁刺激(Transcranial Magnetic ***)在改善脑梗死后遗症期患者上肢痉挛症状中的临床疗效。方法:选取2021年6月~2023年6月在本院就诊的80例脑梗死后遗症期上肢轻至中度痉挛患者,随机将其分为小针刀组(n=26)、TMS... 详细信息

目的:研究小针刀联合经颅磁刺激(Transcranial Magnetic ***)在改善脑梗死后遗症期患者上肢痉挛症状中的临床疗效。方法:选取2021年6月~2023年6月在本院就诊的80例脑梗死后遗症期上肢轻至中度痉挛患者,随机将其分为小针刀组(n=26)、TMS组(n=27)、联合组(n=27)。所有患者在常规康复训练基础上,小针刀组进行小针刀治疗,TMS组进行经颅磁治疗,联合组进行联合治疗。治疗前后评估患者的Fugl-Meyer量表分数、临床痉挛指数分数,运动诱发电位,和静息运动阈值。结果:三组患者治疗后Fugl-Meyer评分均提高,临床痉挛指数评分均下降(P<0.01),其中联合治疗组的FuglMeyer评分高于单一治疗组,临床痉挛指数评分低于单一治疗组(P<0.01):三组患者治疗后运动诱发电位潜伏期均缩短,波幅增高(P<0.01),其中联合治疗组的运动诱发电位潜伏期短于单一治疗组,波幅高于单一治疗组(P<0.01):三组患者治疗后静息运动阈值均下降(P<0.01),其中联合治疗组的静息运动阈值低于单一治疗组(P<0.01)。结论:小针刀联合经颅磁刺激治疗能有效缓解脑梗死后上肢功能痉挛患者的上肢痉挛、中枢神经系统功能及大脑皮层兴奋性,疗效优于单一治疗方法。

关键词：脑梗死上肢痉挛小针刀经颅磁刺激临床痉挛指数运动诱发电位静息运动阈值

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

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：