检索结果-南通市图书馆

International Journal of Minerals,Metallurgy and Materials 2020年第1期27卷 55-62页

作者： Yan-bing zong cheng-yu Zhao Wen-hui chen Zhao-bo Liu Da-qiang Cang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China China Nonferrous Engineering and Research Institute(China ENFI Engineering Corporation) Beijing 100038China

Hydro-sodalites are zeolitic materials with a wide variety of *** ash is an abundant industrial solid waste,rich in silicon and aluminum,from which hydro-sodalite can be ***,traditional hydrothermal synthesis methods are complex and cannot produce high-purity ***,there is a demand for processing routes to obtain high-purity *** the present study,high-purity hydro-sodalite(90.2 wt%)was prepared from fly ash by applying a hydrothermal method to a submolten salt *** were characterized by powder X-ray diffraction(XRD),scanning electron microscopy(SEM),thermogravimetry and differential thermal analysis(TG–DTA),and Fourier transform infrared spectroscopy(FTIR)to confirm and quantify conversion of the raw material into the product *** of the samples prepared with an H2O/Na OH mass ratio of 1.5 and an H2O/fly ash mass ratio of 10 was calculated and the conversion process of the product phase was *** of the product was influenced more by the Na OH concentration,less by the H2O/fly ash mass *** main reaction process of the system is that the Si O ions produced by dissolution of the vitreous body in the fly ash and Na+ions in the solution reacted on the destroyed mullite skeleton to produce *** processing route could help mitigate processing difficulties,while producing high-purity hydro-sodalite from fly ash.

关键词： fly ash submolten salt system hydrothermal method hydro-sodalite

Effect of annealing and cooling rate on toughness of G115 heat-resistant steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第8期29卷 1245-1256页

作者： Zhen Liu Li Gong Chi Zhang Zheng-dong Liu Zheng-zong chen yun-he yu Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute for Special Steels China Iron and Steel Research InstituteBeijing 100081China

The effects of annealing before normalizing and different cooling ways, i.e., air cooling, quenching, and water mist cooling after normalizing on the toughness of G115 steels were investigated. The impact tests showed that the annealed samples had better toughness compared to the unannealed samples for three cooling ways. Microstructure observations revealed that the annealed samples had a more uniform grain distribution, smaller size and area fraction of M_(23)C_(6) particles along the grain boundaries, and lower dislocation density than those in the unannealed samples, which performed together for good toughness. Among three cooling ways, air cooling gave the best toughness due to the smallest occupancy of M23C6 particles in the grain boundaries. Thus, the combination of annealing conducted before normalizing and air cooling selected after normalizing can improve the toughness a lot of G115 steels.

关键词： G115 steel Annealing M_(23)C_(6)particle Dislocation density Toughness

An analysis of the correlation between the fluxes of high-energy electrons and low-middle-energy electrons in the magnetosphere

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

Science China(Technological Sciences) 2016年第7期59卷 1130-1136页

作者： LI chenFang ZOU Hong zong QiuGang JIA XiangHong chen HongFei SHI WeiHong yu XiangQian Institute of Space Physics and Applied Technology School of Earth and Space Science Peking University State Key Laboratory of Space Medicine Fundamentals and Application Chinese Astronaut Research and Training Center

The variation of the flux of energetic electrons in the magnetosphere has been proven to be strongly related to the solar wind speed. Observations of GEO orbit show that the flux of low-energy electrons is not only modulated by the solar wind speed, but, if a time delay is added, is also positively correlated to the flux of high-energy electrons. This feature provides a possible method to forecast the flux of high-energy electrons in GEO orbit. In this study, the correlations of the fluxes between the high-energy electrons and low-middle-energy electrons obtained at different L values and in different orbits are investigated to develop the application of this feature. Based on the analysis of long–term data observed by NOAA POES and GOES, the correlations between the fluxes of high-energy electrons and low–middle–energy electrons are good enough at different L values and in different orbits in quiet time, but this correlation is strongly affected by CME–driven geomagnetic storms.

关键词： magnetosphere high-energy electrons low-middle energy electrons forecast model

Rock physics and seismic reflectivity parameterization and amplitude variation with offsets inversion in terms of total organic carbon indicator

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第4期20卷 2092-2112页

作者： Song-He yu Zhao-yun zong Xing-Yao Yin Kun Lang Fu-Bin chen School of Geosciences China University of Petroleum(East China)QingdaoShandong266580China Pilot National Laboratory for Marine Science and Technology(Qingdao) QingdaoShandong266580China Shandong Provincial Key Laboratory of Deep Oil and Gas QingdaoShandong266580China

Total organic carbon (TOC) prediction with elastic parameter inversions has been widely used in the identification and evaluation of source rocks. However, the elastic parameters used to predict TOC are not only determined by TOC but also depend on the other physical properties of source rocks. Besides, the TOC prediction with the elastic parameters inversion is an indirect method based on the statistical relationship obtained from well logs and experiment data. Therefore, we propose a rock physics model and define a TOC indicator mainly affected by TOC to predict TOC directly. The proposed rock physics model makes the equivalent elastic moduli of source rocks parameterized by the TOC indicator. Combining the equivalent elastic moduli of source rocks and Gray’s approximation leads to a novel linearized approximation of the P-wave reflection coefficient incorporating the TOC indicator. Model examples illustrate that the novel reflectivity approximation well agrees with the exact Zoeppritz equation until incident angles reach 40°. Convoluting the novel P-wave reflection approximation with seismic wavelets as the forward solver, an AVO inversion method based on the Bayesian theory is proposed to invert the TOC indicator with seismic data. The synthetic examples and field tests validate the feasibility and stability of the proposed AVO inversion approach. Using the inversion results of the TOC indicator, TOC is directly and accurately estimated in the target area.

关键词： TOC Rock physics Seismic reflectivity AVO inversion Source rocks

Anti-proton contamination design of the imaging energetic electron spectrometer based on Geant4 simulation

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第8期58卷 1385-1391页

作者： LUO Lin ZOU Hong zong QiuGang WANG LingHua chen HongFei SHI WeiHong yu XiangQian Institute of Space Physics and Applied Technology School of Earth and Space SciencePeking University

The measurement of energetic particles plays an important role in the space environment monitoring and space weather *** accuracy of the energetic electron measurement is seriously influenced by the proton *** anti-proton contamination design for the sensor of imaging energetic electron spectrometer is introduced in this *** to the electron and proton spectrum on the typical satellite orbits calculated by the radiation belt models,the efficiency of the anti-proton contamination design is estimated by the Geant4 simulation and the design is optimized based on the simulation results.

关键词： energetic particle measurement imaging energetic electron spectrometer anti-proton design Geant4 simulation

[Construction of a 17 β-estradiol sensor based on a magnetic graphene oxide/aptamer separating material]

在线全文

学校读者我要写书评

暂无评论

Se pu = Chinese journal of chromatography 2025年第1期43卷 87-95页

作者： Xin-yu Jin Le-yuan chen Ya-Nna Liu Wen-Jing Xie Han-Yong Peng State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. University of Chinese Academy of Sciences Beijing 100049 China. School of Environment Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 China.

17-Estradiol (E2) is a natural steroidal estrogen essential for a variety of physiological functions in organisms. However, external E2, which is renowned for its potent biological effects, is also considered to be an endocrine-disrupting compound (EDC) capable of disturbing the normal operation of the endocrine system, even at nanogram-per-liter (ng/L) concentrations. Studies have revealed that medical and livestock wastewater can be contaminated with E2, which poses potential risks to human health. Currently, the primary method for detecting E2 relies on liquid chromatography-mass spectrometry, which is limited with regard to on-site or large-scale sample testing due to instrumental constraints. Herein, we developed a magnetic graphene oxide (MGO)/aptamer separating material. The MGO was synthesized by creating a water-in-oil microemulsion at 90 ℃, an agarose hydrogel to load the FeO nanoparticles, and layered graphene oxide (GO). In contrast to conventional methods, such as chemical co-precipitation and solvothermal approaches, this method is more time-efficient and does not require high temperature or pressure. Moreover, the use of a physical encapsulation technique for enwrapping the FeO nanoparticles and layered GO eliminates the need for chemical modification. This approach reduces the use of harmful chemicals, ensures complete loading, and results in highly efficient encapsulation. The MGO was characterized using Fourier-transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM), as well as dynamic light scattering (DLS) and Zeta potential analyses, which revealed that the FeO nanoparticles had been successfully loaded onto the GO to produce MGO particles mainly around 5 μm in size. Additionally, this study demonstrated that the aqueous MGO dispersion is highly stable. This substance was used to develop a fluorescent biosensor that uses a "turn-on" mechanism to rapidly and highly sensitively detect E2. MGO is capable of adsorbing a fl

关键词： 17-estradiol (E2) fluorescence biosensor magnetic graphene oxide (MGO) magnetic solid phase separation

农业社会化服务对长江经济带农业生态效率的影响——基于劳动力和资本要素配置视角

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

华东经济管理 2025年第1期39卷 21-30页

作者：陈卫洪于晴贵州大学经济学院贵州贵阳550000

农业社会化服务是实现农业生产绿色转型的重要途径。文章基于2009—2021年长江经济带110个地级市面板数据对农业生态效率进行测算,并采用固定效应模型、中介效应模型和门槛效应模型探究农业社会化服务对农业生态效率的影响及内在机制。... 详细信息

农业社会化服务是实现农业生产绿色转型的重要途径。文章基于2009—2021年长江经济带110个地级市面板数据对农业生态效率进行测算,并采用固定效应模型、中介效应模型和门槛效应模型探究农业社会化服务对农业生态效率的影响及内在机制。研究发现:长江经济带农业生态效率总体上呈“U”型变化趋势,上游农业生态效率高于中游、下游及总体区域;农业社会化服务对农业生态效率具有显著的促进作用,且可以通过优化劳动力和资本要素配置间接提升农业生态效率。门槛检验进一步表明,农业社会化服务对农业生态效率的影响呈现边际效应递增的非线性特征。由此,长江经济带应加快完善农业社会化服务体系,以促进农业生态效率提升。

关键词：农业社会化服务劳动力资本要素配置农业生态效率

同方期刊数据库博看期刊

Cerebral fat embolism following autologous fat injection in facial reconstruction:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第2期13卷 50-58页

作者： Xiu-Ying chen Fa Shen Chang cheng yu-Han Wang Wen-Chao cheng De-Zhi yuan Wen Huang Department of Neurology Chongqing Emergency Medical CenterChongqing University Central HospitalChongqing 400000China Department of Neurology Xinqiao HospitalThe Army Medical University(Third Military Medical University)Chongqing 400000China

BACKGROUND Autologous fat injection in facial reconstruction is a common cosmetic *** cerebral fat embolism(CFE)as a complication is rare,it carries serious health *** SUMMARY We present a case of a 29-year-old female patient who developed acute CFE following facial fat filling *** the surgery,the patient experienced symptoms including headache,nausea,vomiting,and difficulty breathing,which was followed by neurological symptoms such as slurred speech and left-sided *** physical examination and auxiliary investigations,including blood tests,head and neck computed tomography angiography,and cranial magnetic resonance diffusion-weighted imaging,were performed upon *** clinical diagnosis was acute cerebral embolism following facial fat filling *** included measures to improve cerebral circulation,dehydration for intracranial pressure reduction,nutritional support,and rehabilitation therapy for left limb *** patient showed a significant improvement in symptoms after 2 weeks of *** recovered left limb muscle strength to grade 5,had clear speech,and experienced complete relief of *** Our case highlights the potential occurrence of severe complications in patients undergoing fat injection in facial *** prevent these complications,plastic surgeons should enhance their professional knowledge and skills.

关键词： Cerebral fat embolism Mechanical thrombectomy Thrombolysis Steroid therapy Symptomatic treatment Case report

Chinese Medicine Meets Conventional Medicine in Targeting COVID-19 Pathophysiology,Complications and Comorbidities

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

Chinese Journal of Integrative Medicine 2022年第7期28卷 627-635页

作者： WANG Shan-shan ZENG Xian WANG Ya-li Zhuoma Dongzhi ZHAO yu-fen chen yu-zong Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences Institute of Drug Discovery TechnologyNingbo UniversityNingboZhejiang Province 315211China Department of Biological Medicines&Shanghai Engineering Research Center of Immunotherapeutics Fudan University School of PharmacyShanghai 201203China Bioinformatics and Drug Design Group Department of PharmacyNational University of Singapore117543Singapore Medical College Tibet UniversityLhasa 850011China Department of Chemical Biology College of Chemistry and Chemical Engineeringand The Key Laboratory for Chemical Biology of Fujian ProvinceXiamen UniversityXiamenFujian Province 361005China Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 102206China

Objective: To investigate how the National Health Commission of China(NHCC)-recommended Chinese medicines(CMs) modulate the major maladjustments of coronavirus disease 2019(COVID-19),particularly the clinically observed complications and comorbidities. Methods: By focusing on the potent targets in common with the conventional medicines, we investigated the mechanisms of 11 NHCC-recommended CMs in the modulation of the major COVID-19 pathophysiology(hyperinflammations, viral replication), complications(pain, headache) and comorbidities(hypertension, obesity, diabetes). The constituent herbs of these CMs and their chemical ingredients were from the Traditional Chinese Medicine Information Database. The experimentally-determined targets and the activity values of the chemical ingredients of these CMs were from the Natural Product Activity and Species Source Database. The approved and clinical trial drugs against these targets were searched from the Therapeutic Target Database and DrugBank Database. Pathways of the targets was obtained from Kyoto Encyclopedia of Genes and Genomes and additional literature search. Results: Overall,9 CMs modulated 6 targets discovered by the COVID-19 target discovery studies, 8 and 11 CMs modulated 8and 6 targets of the approved or clinical trial drugs for the treatment of the major COVID-19 complications and comorbidities, respectively. Conclusion: The coordinated actions of each NHCC-recommended CM against a few targets of the major COVID-19 pathophysiology, complications and comorbidities, partly have common mechanisms with the conventional medicines.

关键词： COVID-19 Chinese medicine target therapeutic mechanism pathophysiology comorbidity