检索结果-南通市图书馆

Improved anticorrosion performance of mixed valence Mnmodified ZnO dilute magnetic solid solution with multilevel selfassembled network structure

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 2022年第7期15卷 6590-6600页

作者： yi-Xiang Chen Dan Zhou Xiao-Jiao Guo Xiu Yang Si-Rui Zhao yi lu Jin-Ku Liu Key Laboratory for Advanced Materials School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Material Corrosion and Protection Key Laboratory of Sichuan ProvinceZigong 643000China

The design and performance prediction of efficient anticorrosion materials is a work full of value,novelty,and *** this work,from the perspective of nanostructure and composition,ZnO-based dilute magnetic solid solution(DMSs)with hydrophobic micronano network structure was synthesized through the self-induced effect of raw materials,the impact-resistant network structure,complex micro-channels,and densely nested layers resisted electrolyte ***,the doping of mixed valence Mn element endowed the solid solution with dilute magnetic properties,so the Lorentz force from micromagnetic field changed the movement path of electrons produced by the anode reaction to improve the corrosion inhibition ability of the protective *** the synergy of morphology and magnetism,the corrosion resistance of the DMSs materials was 555.4%and 173.8%higher than that of epoxy resin and ZnO shielding layer,***,a valuable phenomenon was found that the photocatalytic property of DMSs materials was positively correlated with their corrosive *** conclusion,this research provided a novel design idea for new high-efficiency anticorrosion materials.

关键词： Mn-modified ZnO dilute magnetic solid solution network nanostructure anticorrosion functional nanomaterials

Economic and Social Impact Assessment of the Alternatives to DDT Usage for Antifouling Paint Production in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2008年第3期6卷 48-55页

作者： Zhang yi Xiao Yali lu Yongsen College of Environmental Science and Engineering Tongji University Shanghai 200092 China

China is the only nation that uses DDT in antifouling pain at present, approximately 5% of DDT is applied as the additive of the antifouling paint production. Therefore, actions shall be taken urgently for banning the use of DDT and substituting with non-POPs alternatives in antifouling paints. The paper researches the social and economic backgrounds of DDT booster antifouling paint production and usage, analyzes the social and economic impact assessment of the alternatives to DDT usage for antifouling paint. The implementation of the project of alternatives will completely eliminate the adverse impact of DDT booster antifouling paint on terrestrial, marine ecosystem and human health. The broad use of alkali silicate and pepper alkali as substitutes will be feasible if appropriate measures will be taken to encourage their development, and the social and economic risk will be reduced to accepted levels.

关键词： DDT antifouling paint social and economic impact assessment alternatives

A Machine Learning-Based Parameterized Tropical Cyclone Precipitation Model

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2024年第6期15卷 972-985页

作者： yi lu Jie yin Peiyan Chen Hui Yu Sirong Huang Shanghai Typhoon Institute China Meteorological Administration School of Geographic Sciences East China Normal University Asia-Pacific Typhoon Collaborative Research Center Shanghai Engineering Research Center of Intelligent Education and Bigdata Shanghai Normal University

Current simulation models considerably underestimate local-scale,short-duration extreme precipitation induced by tropical cyclones (TCs).This problem needs to be addressed to establish active response policies for TC-induced *** Shanghai,a coastal megacity,as a study area and based on the observations from 192 meteorological stations in the city during 2005–2018,this study optimized the parameterized Tropical Cyclone Precipitation Model (TCPM) initially designed for TCs at the national scale (China) to the local or regional scales by using machine learning (ML) methods,including the random forest (RF),extreme gradient boosting (XGBoost),and ensemble learning (EL) *** TCPM-ML was applied for multiple temporal scale hazard *** results show that:(1) The TCPM-ML not only improved TCPM performance for simulating hourly extreme precipitations,but also preserved the physical meaning of the results,contrary to ML methods;(2) Machine learning algorithms enhanced the TCPM ability to reproduce observations,although the hourly extreme precipitations remained slightly underestimated;(3) Best performance was obtained with the XGBoost or EL *** the strengths of both XGBoost and RF,the EL algorithm yielded the best overall *** study provides essential model support for TC disaster risk assessment and response at the local and regional scales in China.

关键词： Extreme precipitation Machine learning Parameterized model Shanghai Tropical cyclone

Characteristic wavelength selection of volatile organic compounds infrared spectra based on improved interval partial least squares

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2019年第2期12卷 35-53页

作者： Wei Ju Changhua lu Yujun Zhang Weiwei Jiang Jizhou Wang yi Bing lu Feng Hong School of Computer and Information Hefei University of Technology HefeiAnhui 230009P.R.China Anhui Institute of Optics Fine Mechanics Chinese Academy of Sciences HefeiAnhui 230031P.R.China

As important components of air pollutant,volatile organic compounds(VOCs)can cause great harm to environment and human *** concentration change of VOCs should be focused on in real-time environment monitoring *** order to solve the problem of wavelength redundancy in full spectrum partial least squares(PLS)modeling for VOCs concentration analysis,a new method based on improved interval PLS(iPLS)integrated with Monte-Carlo sampling,called iPLS-MC method,was proposed to select optimal characteristic wavelengths of VOCs *** method uses iPLS modeling to preselect the characteristic wavebands of the spectra and generates random wavelength combinations from the selected wavebands by Monte-Carlo *** wavelength combination with the best prediction result in regression model is selected as the characteristic wavelengths of the *** wavelength selection methods were built,respectively,on Fourier transform infrared(FTIR)spectra of ethylene and ethanol gas at different concentrations obtained in the *** the interval number of iPLS model is set to 30 and the Monte-Carlo sampling runs 1000 times,the characteristic wavelengths selected by iPLS-MC method can reduce from 8916 to 10,which occupies only 0.22%of the full spectrum *** the RMSECV and correlation coefficient(Rc)for ethylene are 0.2977 and 0.9999 ppm,and those for ethanol gas are 0.2977 ppm and *** experimental results show that the iPLS-MC method can select the optimal characteristic wavelengths of VOCs FTIR spectra stably and effectively,and the prediction performance of the regression model can be significantly improved and simplified by using characteristic wavelengths.

关键词： Ambient air monitoring Fourier transform infrared spectra analysis variable selection interval partial least square Monte-Carlo sampling

Nitrogen Leaching in Vegetable Fields in the Suburbs of Shanghai

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2005年第5期15卷 641-645页

作者： CAO Lin-Kui CHEN Guo-Jun lu yi-Tong School of Agriculture and Biology Shanghai Jiaotong University Shanghai 201101 （China）

Nitrogen (N) leaching in vegetable fields from December 2002 to May 2003 with equal dressings of total N for asequential rotation of Chinese flat cabbage (Brassica chinensis L. var. rosularis) and lettuce (Lactuca sativa L.) in asuburban major vegetable production base of Shanghai were examined using the lysimeter method to provide a scientificbasis for rational utilization of nitrogen fertilizers so as to prevent nitrogen pollution of water resources. Results showedthat leached N consisted mainly of nitrate N, which accounted for up to more than 90% of the total N loss and couldcontribute to groundwater pollution. Data also showed that by partly substituting chemical N (30%) in a basal dressingwith equivalent N of refined organic fertilizer in the Chinese flat cabbage field, 64.5% of the leached nitrate N was reduced,while in the lettuce (Lactuca sativa L.) field, substituting 1/2 of the chemical N in a basal dressing and 1/3 of the chemicalN in a top dressing with equivalent N of refined organic fertilizers reduced 46.6% of the leached nitrate N. In the two-year sequential rotation system of Chinese flat cabbage and lettuce, nitrate-N leaching in the treatment with the highestamount of chemical fertilizer was up to 46.55 kg ha-1, while treatment plots with the highest amount of organic fertilizerhad only 17.58 kg ha-1. Thus, partly substituting refined organic fertilizer for chemical nitrogen in the first two seasonshas a great advantage of reducing nitrate-N leaching.

关键词： leaching loss nitrogen organic fertilizer vegetable field

Three-dimensional acetylenic modified graphene for highperformance optoelectronics and topological materials

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 992-998页

作者： Yan Gao Chengyong Zhong Shengyuan A.Yang Kai Liu Zhong-yi lu Department of physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijingChina Institute for Advanced Study Chengdu UniversityChengduChina Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingaporeSingapore Center for Quantum Transport and Thermal Energy Science School of Physics and TechnologyNanjing Normal UniversityNanjingChina

Seeking carbon phases with versatile properties is one of the fundamental goals in physics,chemistry,and materials ***,based on the first-principles calculations,a family of three-dimensional(3D)graphene networks with abundant and fabulous electronic properties,including rarely reported dipole-allowed truly direct band gap semiconductors with suitable band gaps(1.07–1.87 eV)as optoelectronic/photovoltaic materials and topological nodal-ring semimetals,are proposed through stitching different graphene layers with acetylenic ***,the optical absorption coefficients in some of those semiconducting carbon allotropes express possibly the highest performance among all of the semiconducting carbon phases known to *** the other hand,the topological states in those topological nodal-ring semimetals are protected by the time-reversal and spatial symmetry and present nodal rings and nodal helical loops topological *** newly revealed carbon phases possess low formation energies and excellent thermodynamic stabilities;thus,they not only host a great potential in the application of optoelectronics,photovoltaics,and quantum topological materials etc.,but also can be utilized as catalysis,molecule sieves or Liion anode materials and so ***,the approach used here to design novel carbon allotropes may also give more enlightenments to create various carbon phases with different applications.

关键词： dimensional topological versatile

Additional manual thrombus aspiration for ST-segment elevation myocardial infarction during percutaneous coronary intervention： an updated meta- 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

Journal of Geriatric Cardiology 2016年第4期13卷 344-354页

作者： Yan ZHANG Li PENG Yong-Yan FAN Cai-yi lu Department of Cardiology Chinese PLA General Hospital Beij'ing China

Background The clinical efficacy and safety of adjunctive thrombus aspiration （TA） in patients with ST-segment elevation myocardial infarction （STEMI） during percutaneous coronary intervention （PCI） remain controversial. Methods Twenty five eligible randomized controlled trials were included to compare the use of thrombus aspiration （TA） with PCI and PCI-only for STEMI. The primary endpoint was all-cause mortality and death. The secondary endpoints were major adverse cardiac events （MACE）, recurrent infarction （RI）, target vessel revascularization （TVR）, stent thrombosis （ST）, perfusion surrogate markers and stroke. Results TIMI flow grade 3 and MBG 2-3 were significantly increased in the TA plus PCI arm compared with the PCI-only arm [relative risk （RR）： 1.05, 95% confidence intervals （CI）： 1.02-1.09, P = 0.004] and （RR： 1.68, 95% CI： 1.40-2.00, P 〈 0.001）, respectively. There were no significant differences in all-cause mortal- ity, MACEs, TVR and ST rates between the two groups. The RI rate was lower in the TA plus PCI arm than that in the PCI-only arm with short-term follow-up duration （RR： 0.60, 95% CI： 0.38-0.96, P = 0.03）, but there was no significant difference in RI incidence over the me- diumor long-term follow-up periods （RR： 1.00, 95% CI： 0.77-1.29, P = 0.98）, and （RR： 0.96, 95% CI： 0.81-1.15, P = 0.69）, respectively. There were statistically significant differences in the rates of crude stroke and stroke over the medium- or long-term follow-up periods and the crude stroke rate in the TA plus PCI （RR： 1.60, 95% CI： 1.08-2.38, P = 0.02） and （RR： 1.43, 95% CI： 1.03-1.98, P = 0.03）, respectively; this was not observed between the two arms during the short-term follow-up period （RR： 1.47, 95% CI： 0.97-2.21, P = 0.07）. Conclusions Routine TA-assisted PCI in STEMI patients can improve myocardial reperfusion and get limited benefits related to the clinical endpoints, which may be associated with stroke risk.

关键词： Manual thrombus aspiration Meta-analysis percutaneous coronary intervention Randomized controlled trials ST-segment ele-vation myocardial infarction

INVESTIGATION ON STABILITY OF PZT/EPOXY PIEZOCOMPOSITE WITH PRESSURE AND TEMPERATURE

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2009年第3期22卷 226-231页

作者： Likun Wang Yuanyuan Wan Li Li Lei Qin yi lu Beijing Key Laboratory for Sensor Beijing Information Science and Technology University Beijing 100101 China Computer Science and Technology Department Shenyang Institute of Chemical Technology 11 Economic Development District Shenyang 110142 China The Department of Foreign Languages Teaching Yunnan University Kunming 650091 China

With the universal test machine and temperature test chamber, the effect of pressure and temperature on the behavior of 1-3 and 1-3-2 piezocomposites prepared with PZT/epoxy in our lab has been investigated through electrical impedance and dielectric analysis. The permittivity, resonant frequency and dielectric loss of the composites have been measured under vertical stress and temperature, and the variety of the material properties under pressure and temperature could also be obtained. The pressure and temperature stability of the composites have been assessed through experiments. The data of these two types of composites indicated that the stability of 1-342 composite with pressure was better than that of 1-3 composite, and two composites have almost the same dielectric stability with temperature. However, 1-3-2 composite showed slower frequency variation than 1-3 composite.

关键词： piezoelectric composite directional pressure temperature stability

Placement of dual capsular tension rings for the combined management of traumatic cyclodialysis cleft and zonular dialysis

在线全文

学校读者我要写书评

暂无评论

Eye and Vision 2020年第6期7卷 535-542页

作者： Jiahui Chen Lina Lan Yating Tang yi lu Yongxiang Jiang Eye Institute and Department of Ophthalmology Eye Ear Nose and Throat HospitalFudan University83 Fenyang RdShanghai 200031China NHC Key Laboratory of Myopia(Fudan University) Key Laboratory of MyopiaChinese Academy of Medical SciencesShanghai 200031China Shanghai Key Laboratory of Visual Impairment and Restoration Shanghai 200031China

Background:To evaluate the efficacy and safety of placing dual capsular tension rings for the combined management of traumatic cyclodialysis cleft and zonular ***:A modified capsular tension ring was inserted into the ciliary sulcus and a capsular tension ring or modified capsular tension ring was inserted into the capsular bag in 20 eyes in 20 consecutive patients showing signs of ocular hypotony and ectopia *** measures included intraocular pressure,best-corrected visual acuity,and postoperative ***:Dual capsular tension ring placement was performed in 20 patients with a mean age of 48.7 *** cyclodialysis cleft extended over 2.9 clock hours(range 0.5-6.5).The modified capsular tension ring was successfully inserted into the ciliary sulcus and a capsular tension ring or modified capsular tension ring in the capsular bag in all *** the last follow-up,the cyclodialysis cleft was closed in 16/20(80.0%)*** intraocular lens was stable in all patients ***-corrected visual acuity,in terms of the logarithm of the minimal angle of resolution,improved from 1.3±0.8 before surgery to 0.4±0.3 after surgery(Pluded a painful reversible intraocular pressure spike in four patients(20.0%).Logistic regression revealed no significant factors associated with successful cleft closure and a stable final intraocular pressure of≥10 ***:The placement of two capsular tension rings into the ciliary sulcus and the capsular bag is a safe,successful procedure combined for repairing a traumatic cyclodialysis cleft and managing zonular dialysis.

关键词： Capsular tension ring Cyclodialysis cleft Zonular dialysis Combined surgery