检索结果-南通市图书馆

Impact of cropland degradation in the rural-urban fringe on urban heat island and heat stress during summer heat waves in the Yangtze River Delta

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2022年第2期13卷 240-250页

作者： Hong-Yun MA Hai-Jun LI mi zhang Xuan DONG Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC)Nanjing University of Information Science and TechnologyNanjing 210044China Jiangxi Meteorological Observatory Nanchang 330046China School of Atmospheric Sciences Nanjing UniversityNanjing 210023China

China has experienced rapid urbanization since the 1980s,which has significantly reduced croplands around *** from transition to urban land,croplands have also experienced degradation into cropland/natural vegetation mosaic in the rural-urban ***,scant attention has been paid to the climatic effect of such land cover change so *** study thus investigated the potential impacts of the conversion from irrigated cropland into the mosaic on regional hot extremes and heat stress by taking the Yangtze River Delta(YRD)as an *** heatwave events in the summer of 2013 and 2017 were simulated using the Weather Research and Forecasting Model(WRF).Three group experiments with various representative land cover scenarios,i.e.,a default setting experiment with outdated land cover(Exp USGS),a control experiment with updated land cover(CTL),and a sensitivity experiment with modified mosaic land cover(Exp MOS),were performed for comparative *** show that CTL using the updated land cover data from China(ChinaLC)reproduced the spatial variation of observed 2-m air temperature and relative humidity better than Exp *** the irrigated cropland was converted into the mosaic,the 2-m temperatures in most areas of the YRD became significantly higher than those in Exp MOS due to the lower albedo and leaf area index(LAI)in the newly emerged mosaic *** land cover change produced a negative contribution to the urban heat island(UHI)intensity,while it had a positive effect on extreme high temperature under heat wave *** suggests a more cautious usage of the traditional definition of the UHI index is required when investigating the heat island effect,because the rural warming around an urban area may expand the heat island and enhance its heat *** the heatwave periods,the high temperature areas in CTL were larger than those in MOS,and the hot day areas increased by an average of 25.9%.Increase in air temperature further

关键词： Cropland degradation Cropland/natural vegetation mosaic Urban heat island Extreme temperature Heat stress

Muscarinic acetylcholine receptor M1 mediates prostate cancer cell migration and invasion through hedgehog signaling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2018年第6期20卷 608-614页

作者： Qing-Qing Yin Lin-Hui Xu mi zhang Chen Xu Institute of Life Sciences Chongqing Medical UniversityChongqing 400016China.

The autonomic nervous system contributes to prostate cancer proliferation and metastasis. However, the exact molecular mechanism remains unclear. In this study, muscarinic acetylcholine receptor M1 （CHRM1） expression was measured via immunohistochemical analysis in human prostate cancer tissue array slides. PC-3, LNCaP, and A549 cells were treated with pirenzepine or carbachol, and the cell migration and invasion abilities were evaluated. Western blotting and quantitative real-time PCR were performed to measure GLI family zinc finger 1 （GLI1）, patched 1 （PTCH1）, and sonic hedgehog （SHH） expression levels. High expression of CHRM1 was found in early-stage human prostate cancer tissues. In addition, the selective CHRM1 antagonist pirenzepine inhibited PC-3, LNCaP, and A549 cell migration and invasion, but the agonist carbachol promoted the migration and invasion of these three cell lines. Muscarinic signaling can be relayed by hedgehog signaling. These data show that CHRM1 is involved in the regulation of prostate cancer migration and invasion through the hed^eho~ si^nalin~ ~athwav.

关键词： hedgehog signaling muscarinic acetylcholine receptor M1 (CHRM1) metastasis prostate cancer

Non-Symmetry of China’s and US Monetary Policy Spillovers:Theoretical Modelling and Empirical Analysis

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 Economist 2023年第5期18卷 76-97页

作者： Mei Dongzhou zhang mi School of International Economics and Trade Central University of Finance and Economics(CUFE)BeijingChina

This study develops a structural vector autoregression(SVAR)framework to empirically examine the reciprocal transmission channels of monetary policies between China and the United *** primary objective is to discern potential disparities in the spillover effects of monetary policies and ascertain any contrasting mechanisms underlying these effects across the two *** on our research,it appears that there exists a certain level of non-symmetry in the spillover effects of monetary policy between the two ***,this paper provides adequate analysis of disparities in the trade framework,capital control,and financial market operations of both countries in constructing a dynamic stochastic general equilibrium(DSGE)model that incorporates financial frictions for the examination of the theoretical *** empirical findings indicate that China’s monetary policy creates a spillover effect primarily through *** China,following an increase in its interest rates,the domestic economic activity will experience a contraction,leading to a decline in both investment and ***,this will result in a decrease in China’s imports of investment goods from the United States,impacting the output of the US *** contrast,the US monetary policy exerts a spillover effect primarily through *** increase in interest rates by the United States is associated with a notable outflow of capital from *** leads to a rise in the financing costs for Chinese firms,consequently diminishing their overall net *** light of the financial accelerator effect,corporate external financing risk premium will continue to increase,exacerbating the downward trajectory of China’s output.

关键词： Monetary policy spillovers non-symmetry trade channel financial channel international policy coordination

Reactive molecular dynamics insight into the thermal decomposition mechanism of 2,6-Bis(picrylamino)-3,5-dinitropyridine

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 134-146页

作者： Jianbo Fu Hui Ren Xinzhou Wu Yongjin Chen mi zhang Yazhi Cheng State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

2,6-bis(picrylamino)-3,5-dinitropyridine(PYX)has excellent thermostability,which makes its thermal decomposition mechanism receive much *** this paper,the mechanism of PYX thermal decomposition was investigated thoroughly by the ReaxFF-lg force field combined with DFT-B3LYP(6-311++G)*** detailed decomposition mechanism,small-molecule product evolution,and cluster evolution of PYX were mainly *** the initial stage of decomposition,the intramolecular hydrogen transfer reaction and the formation of dimerized clusters are earlier than the denitration *** the progress of the reaction,one side of the bitter amino group is removed from the pyridine ring,and then the pyridine ring is *** final products produced in the thermal decomposition process are CO_(2),H_(2)O,N_(2),and H_(2).Among them,H_(2)O has the earliest generation time,and the reaction rate constant(k_(3))is the *** clusters are formed during the decomposition of PYX,and the formation,aggregation,and decomposition of these clusters are strongly affected by *** low temperatures(2500 K-2750 K),many clusters are *** high temperatures(2750 K-3250 K),the clusters aggregate to form larger *** 3500 K,the large clusters decompose and become *** the late stage of the reaction,H and N in the clusters escaped almost entirely,but more O was trapped in the clusters,which affected the auto-oxidation process of ***'s initial decomposition activation energy(E_(a))was calculated to be 126.58 kJ/*** work contributes to a theoretical understanding of PYX's entire thermal decomposition process.

关键词： PYX Thermal decomposition ReaxFF-lg MD simulations Excellent thermostable explosives

Effects of Different Molten-salt on the Synthesis of Hexagonal Barium Ferrite

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2006年第B12期19卷 206-209页

作者： WANGJing-ping LIU Ying HU min zhang mi-lin College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Hexagonal-plate BaFe12O19 nano-particles were prepared by combining the co-precipitation and molten-salt method. The effects of molten-salt NaCl on the products have been compared with those of KCl. The X-ray diffraction analysis, the environment scanning electron microscopy and the vibrating sample magnetometer were used to measure their characteristics. The results show that the mol- ten-salt KCl is helpful to obtain pure phase while the molten-salt NaCl will prompt the crystallinity of particles to increase. It is also found that, given the molten-salt of NaCl and that of KCl of the same quantity, the particles formed are also the same size. The size of particles slightly increases as the quantity of the salt increases. Moreover, the sample prepared under 200% NaCl salt system has magnetization of 71.5 emu/g.

关键词： BaFe12O19 nanoparticles synthesis magnetic property

Removal of microcystin-LR from drinking water using a bamboo-based charcoal adsorbent modified with chitosan

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第12期23卷 1983-1988页

作者： Hangjun zhang Guoying Zhu Xiuying Jia Ying Ding mi zhang Qing Gao Ciming Hu Shuying Xu College of Biology and Environmental Sciences Hangzhou Normal University Hangzhou 310036 China Institute of Industry EP＆D Hangzhou 310005 China College of Environmental and Resource Sciences Zhejiang University Hangzhou 310058 China

A new kind of low-cost syntactic adsorbent from bamboo charcoal and chitosan was developed for the removal of microcystin-LR from drinking water. Removal effciency was higher for the syntactic adsorbent when the amount of bamboo charcoal was increased. The optimum dose ratio of bamboo charcoal to chitosan was 6：4, and the optimum amount was 15 mg/L; equilibrium time was 6 hr. The adsorption isotherm was non-linear and could be simulated by the Freundlich model （R2 = 0.9337）. Adsorption efficiency was strongly afflected by pH and natural organic matter （NOM）. Removal efficiency was 16% higher at pH 3 than at pH 9. Efficiency rate was reduced by 15% with 25 mg/L NOM （UV254 = 0.089 cm-1） in drinking water. This study demonstrated that the bamboo charcoal modified with chitosan can effectively remove microcystin-LR from drinking water.

关键词： adsorption bamboo charcoal chitosan microcystin-LR

Performance Improved by Incorporating of Ru Atoms into Zr-Si Diffusion Barrier for Cu Metallization

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第9期29卷 215-218页

作者： WANG Ying SONG Zhong-Xiao zhang mi-Lin College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001 State-Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049 Key Laboratory of Superlight Materials and Surface Technology(ministry of Education) Harbin Engineering UniversityHarbin 150001

Thin Ru_(21)Zr_(64)Si_(15) films deposited on Si substrates by radio frequency reactive magnetron sputtering are studied and evaluated as diffusion barriers for Cu ***/Ru_(21)Zr_(64)Si_(15)/Si and Cu/Zr_(67)Si_(33)/Si structure samples are prepared under the same procedures for *** thermal stability,phase formation,surface morphology and atomic depth profile of the Cu/Ru_(21)Zr_(64)Si_(15)/Si and Cu/Zr_(67)Si_(33)/Si structures before and after annealing at different temperatures are *** conjunction with these analyses,the Cu/Ru_(21)Zr_(64)Si_(15)/Si contact system shows high thermal stability at least up to 650℃.The results obtained reveal that the incorporation of Ru atoms into the Zr_(67)Si_(33) barrier layer is shown to be beneficial for improving the thermal stability of the Cu/barrier/Si contact system.

关键词： stability barrier thermal

Surface-state controlled synthesis of hydrophobic and hydrophilic carbon dots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 4391-4399页

作者： Chan Wang Yuan Fang mi zhang Huan Zhuo Qijun Song Han Zhu Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Jiangsu Snow Leopard Household Chemical Co. Ltd.Wuxi 214400China

It is of great significance to synthesize carbon dots(CDs)with desirable hydrophilicity for the ever-growing application of CDs in different *** this study,the hydrophilic and hydrophobic CDs were facilely prepared by solvothermal treatment of o-dihydroxybenzene and urea in N,N-dimethylformamide(DMF).Optimization experiments revealed that the solvothermal temperature has a great impact on the surface states of the *** hydrophobic CDs with a contact angle of 110.7°was obtained at 200℃.The structural and optical characterizations,along with theoretical calculations elucidated that the lipophilic nature of the CDs was resulting from the formation of polymer *** presence of extended conjugated sp^(2)-domains and amino groups contributed to the red emission of the CDs synthesized at low reaction temperatures(160-200℃).With the further increase of solvothermal temperature,the hydrophobic CDs were gradually transformed to the hydrophilic state accompanying the blue shift of the fluorescence of the *** highly hydrophilic CDs with a contact angle of 25.9°were obtained at 240℃ due to the increased formation of hydrophilic functional groups on the surface of *** red emissive CDs exhibited a sensitive color and fluorescence response to ethanol content while the fluorescence of the blue emissive CDs remained *** combining the two kinds of CDs,a dual-emission sensor was constructed,which was successfully applied for the evaluation of the alcoholic strength in commercial Baijiu commodities in both fluorometric and colorimetric modes.

关键词： carbon dots surface chemistry hydrophilicity and hydrophobicity solvothermal temperature alcoholic strength evaluation

Global Spillovers of China's Monetary Policy

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 & World Economy 2024年第3期32卷 1-30页

作者： Wenni Lei Dongzhou Mei mi zhang School of Economics Minzu University of ChinaChina School of International Trade and Economics Central University of Finance and EconomicsChina

Spillovers from China's monetary policy have become increasingly obvious with China's growing importance in the global economy and its close economic and trade ties with the *** study establishes a proxy structure vector autoregression model to investigate the magnitude and transmission channel of spillovers from China to global and regional economies,taking advantage of high-frequency changes in asset prices in the financial markets to identify monetary policy *** analysis reveals that China's monetary policy can affect the global economy by influencing international trade and commodity prices but there is no evidence of China's monetary policy affecting global financial *** in China's monetary policy can cause a decline in world output whereas expansion in monetary policy can support global trade and *** study also finds that the response of emerging Asian economies to China's monetary policy shock was nearly twice that of developed economies,while the transmission path did not *** results of this study are consistent with the stylized fact that China's monetary policy plays an important role in the global trade and commodity cycle,although it does not drive the global financial cycle.

关键词： China's monetary policy commodity prices external instruments global trade spillovers