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Nano research 2024年第5期17卷 3895-3901页

作者： Rui Sui Bingyan Wang Yongsheng Wang Jiajing Pei Wei Zhu Wenxing Chen Chunhui Li Ailing Sun Zhongbin Zhuang Engineering research Center of Advanced Rare Earth Materials Department of ChemistryTsinghua UniversityBeijing 100084China College of Chemistry and Green Catalysis Center Zhengzhou UniversityZhengzhou 450001China State Key lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Synchrotron radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

The electrochemical CO_(2) reduction reaction(CO_(2)RR)has received widespread attention as a promising method for producing sustainable chemicals and mitigating the global ***,we demonstrate a general and facile synthetic route for the metal-nitrogen-carbon(M-N-C)type catalyst by simply calcinating metal acetate and urea with commercial carbon black,which have potential application in CO_(2)*** synthesized Ni-NC-600 catalyst has the structure of single Ni atom coordinated with one N atom and three C atoms(Ni-N_(1)C_(3)),which is suggested by X-ray absorption *** Ni-NC-600 catalyst exhibits high CO_(2)RR catalytic performance and a high CO Faraday efficiency above 98%in a wide potential range from-0.7 to-1.3 V(*** hydrogen electrode(RHE)),superior to most of the reported Ni-N-C *** work has developed a facile strategy to synthesize high performance CO_(2)RR catalyst.

关键词： nickel single atom catalyst CO_(2)reduction reaction CO production electrocatalyst

Nanofiller Dispersion in Polymer Dielectrics

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Materials Sciences and Applications 2013年第4期4卷 6-15页

作者： Daniel Tan Yang Cao Enis Tuncer Patricia Irwin Dielectrics & Electrophysics lab GE Global Research Center Niskayuna Schenectady USA

Nanodielectric composites have been developed in recent years attempting to improve the dielectric properties such as dielectric constant, dielectric strength and voltage endurance. Among various investigations, nanoparticle dispersion was particularly emphasized in this work. general Electric global research Center in Niskayuna NY USA has investigated various nanoparticles, nanocomposites and nanocomposite synthesis methods intending to understand particle dispersion and their impact on the nanocomposite dielectric properties. The breakdown strength and microstructures of the nanocomposites containing different particles were studied for projects related to capacitor and electrical insulation technologies. The nanocomposite synthesis methods either employed commerical nanoparticles or utilized nanoparticles that were self-assembled (in-situ precipitation) in a matrix. Our investigations have shown that nanocomposites prepared with solution chemistry were more favorable for producing uniform dispersion of nanoparticles. Structural information of nanocomposites was studied with transmission electron microscopy and the interection between particles and matrix polymers were tentatively probed using dielectric spectroscopy. In these new class of materials high energy densities on the order of 15J/cc were achievable in nanocomposites.

关键词： Nanoparticles Polymer Dielectrics Filler Dispersion Dielectric Properties

CO耐受的单位点/纳米颗粒协同型质子交换膜燃料电池阳极催化剂

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Science Bulletin 2024年第8期69卷 1061-1070页

作者：王显杨小龙王颖梅丙宝金钊李阳施兆平姜政刘长鹏邢巍葛君杰 State Key laboratory of Electroanalytic Chemistry Jilin Province Key Laboratory of Low Carbon Chemistry PowerInstitution Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China State Key laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Shanghai Synchrotron radiation Facility Zhangjiang National LabShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China University of Chinese Academy of Sciences Beijing 100049China

Nanosized Pt catalysts are the catalyst-of-choice for proton exchange membrane fuel cell(PEMFC)anode,but are limited by their extreme sensitivity to CO in parts per million(ppm)level,thereby making the use of ultrapure H_(2)a prerequisite to ensure acceptable ***,we confront the CO poisoning issue by bringing the Ir/Rh single atom sites to synergistically working with their metallic *** presence of 1000 ppm CO,the catalyst represents not only undisturbed H_(2)oxidation reaction(HOR)catalytic behavior in electrochemical cell,but also unparalleled peak power density at 643 mW cm^(-2)in single cell,27-fold in mass activity of the best PtRu/C catalysts ***-poisoning experiments and surface-enhanced Raman scattering spectroscopy(SERS)and calculation results in combine suggest the presence of adjacent Ir/Rh single atom sites(SASs)to the nanoparticles(NPs)as the origin for this prominent catalytic *** single sites not only exhibit superb CO oxidation performance by themselves,but can also scavenge the CO adsorbed on approximated NPs via supplying reactive OH**** open up a new route here to conquer the formidable CO poisoning issue through single atom and nanoparticle synergistic catalysis,and pave the way towards a more robust PEMFC future.

关键词： CO-tolerant anode catalyst Fuel cells Dual metal catalysts Bifunctional catalyst

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网络科技论文学术影响力评价指标的选择

图书情报工作 2013年第3期57卷 69-77页

作者：沈小玲严卫中安徽财经大学图书馆 Machine Learning lab GE Global Research Center Niskayuna

网络科技论文影响力的评价效果取决于评价指标变量的选择。将网络科技论文影响力评价与论文排名相关联,以Web of Science数据库中数学类论文为样本,从6个不同的排名等级组,即排名前0.01%、0.01%-0.1%、0.1%-1%、1%-10%、10%-20%、20%-5... 详细信息

网络科技论文影响力的评价效果取决于评价指标变量的选择。将网络科技论文影响力评价与论文排名相关联,以Web of Science数据库中数学类论文为样本,从6个不同的排名等级组,即排名前0.01%、0.01%-0.1%、0.1%-1%、1%-10%、10%-20%、20%-50%,分别抽取论文数十篇,用文献信息方法对单篇论文从内容、论文载体和论文作者三个层面初选28个特征变量,以324篇论文的排名等级与28个学术链接指标样本建立为"序回归"模型的研究问题。基于Lasso方法对28个学术链接指标进行变量选择和参数估计,获得9个学术链接特征指标作为评价网络科技论文学术影响力的基本特征指标;以418篇OA论文的排名等级对23个网络影响计量及其衍生变量进行变量选择,获得5个论文网络传播与利用影响力的评价指标。最终共获得14个网络科技论文学术影响力的评价指标。

关键词：网络科技论文特征指标学术链接影响力评价 Lasso回归序回归

Diallyl disulfide and diallyl trisulfide in garlic as novel therapeutic agents to overcome drug resistance in breast cancer

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Journal of Pharmaceutical Analysis 2022年第2期12卷 221-231页

作者： RamaRao Malla Rakshmitha Marni Anindita Chakraborty Mohammad Amjad Kamal Cancer Biology lab Department of Biochemistry and BioinformaticsInstitute of ScienceGandhi Institute of Technology and ManagementVisakhapatnam530045India radiation Biology UGC-DAE-CSRKolkata CentreKolkata700098India King Fahd Medical research Center King Abdulaziz UniversityJeddah21589Saudi Arabia Enzymoics HebershamNovel Global Community Educational FoundationNew South Wales2770Australia

Breast cancer is one of the leading causes of cancer-related deaths in women *** is a cancer that originates from the mammary ducts and involves mutations in multiple ***,the treatment of breast cancer has become increasingly challenging owing to the increase in tumor heterogeneity and aggressiveness,which gives rise to therapeutic ***,populationbased,and hospital-based case-control studies have demonstrated an association between high intake of certain Allium vegetables and a reduced risk in the development of breast *** disulfide(DADS)and diallyl trisulfide(DATS)are the main allyl sulfur compounds present in garlic,and are known to exhibit anticancer activity as they interfere with breast cancer cell proliferation,tumor metastasis,and *** present review highlights multidrug resistance mechanisms and their signaling pathways in breast *** review discusses the potential anticancer activities of DADS and DATS,with emphasis on drug resistance in triple-negative breast cancer(TNBC).Understanding the anticancer activities of DADS and DATS provides insights into their potential in targeting drug resistance mechanisms of TNBC,especially in clinical studies.

关键词： Breast cancer Diallyl disulfide Diallyl trisulfide Drug resistance Metastasis

高原子序数元素CT影像对比:模拟成像研究与临床适应证

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国际医学放射学杂志 2016年第3期 301-301页

作者： P.F.Fitz gerald R.E.Colborn P.M.Edic J.W.Lambert A.S.Torres P.J.Bonitatibus Jr 蓝星 radiation systems lab.ge global research One Research Circle

摘要目的在临床相关成像条件下,比较不同对比剂的CT影像对比度。材料与方法相等质量浓度(每毫升溶液中所含活性成分的克数)的7种对比剂,包括碘、钡、钆、钽、镱、金、铋,配置成水溶液。依据活性元素主导X线的衰减的标准来选择复合物。... 详细信息

摘要目的在临床相关成像条件下,比较不同对比剂的CT影像对比度。材料与方法相等质量浓度(每毫升溶液中所含活性成分的克数)的7种对比剂,包括碘、钡、钆、钽、镱、金、铋,配置成水溶液。依据活性元素主导X线的衰减的标准来选择复合物。在80、100、120和140 k V CT下用修改后的32 cm CT剂量指数模型。为模拟更大的体积,我们分别使用

关键词： CT

Probing the Gamma-Ray Emission Region of Five TeV Flat Spectrum Radio Quasars

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research in Astronomy and Astrophysics 2024年第6期24卷 156-169页

作者： Hu-Bing Xiao Hai-Tao Cao Rui Xue Jin-Ting Cai ge-ge Wang Marina Manganaro Shao-Hua Zhang Zhi-Hao Ouyang Li-Ping Fu Jun-Hui Fan Shanghai Key lab for Astrophysics Shanghai Normal UniversityShanghai 200234China School of Information Engineering Guangzhou Panyu PolytechnicGuangzhou 511483China Department of Physics Zhejiang Normal UniversityJinhua 321004China College of Mathematics and Physics Guangxi Minzu UniversityNanning 530006China Key laboratory of Cosmology and Astrophysics(Liaoning) College of SciencesNortheastern UniversityShenyang 110819China Department of Physics University of RijekaRijeka 51000Croatia Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Key laboratory for Astronomical Observation and Technology of Guangzhou Guangzhou 510006China Astronomy Science and Technology research laboratory of Department of Education of Guangdong Province Guangzhou 510006China

The location ofγ-ray emission of blazars remains a contested topic,inspiring the development of numerous investigative techniques to address this *** this work,we analyzed Fermiγ-ray light curves in the geV and MeV bands,employing the discrete cross-correlation function method to discern time lags between the two *** 4C+21.35,Ton 599,B21420+32,and PKS 1510-089,we identified a time lag spanning several days,while for PKS 1441+25,the time lag was not statistically *** results imply that the soft photons necessary for inverse Compton scattering predominantly originate from the dusty torus in the first four sources,whereas for PKS1441+25,they seem to be sourced mainly from the broad-line *** analysis of the opacity(τγγ)and the geV spectra study supports the conclusion that the location of the dissipation region must be beyond the BLR to avoid significant ***,for PKS 1441+25,the emission region is also posited to lie outside yet proximate to the *** parameters of describing the emission region were obtained by fitting broadband spectral energy distribution with contemporaneous observation *** findings suggest that for the five TeV FSRQs,during Te V flaring events,the jet appears to maintain an equilibrium between the energy density of the magnetic field and that of the particles for all investigated sources,with the exceptions of 4C+21.35 and PKS1441+*** terms of the overall jet power,particle energy is the dominant contributor,and the observed blazar radiation cannot be solely attributed to the magnetic field,except in the case of 4C+***,magnetic reconnection is unlikely to be the primary mechanism behind particle acceleration in these systems.

关键词： galaxies:active gamma-rays:galaxies galaxies:jets

Association Between Diurnal Temperature Range and Respiratory Tract Infections

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Biomedical and Environmental Sciences 2013年第3期26卷 222-225页

作者： ge Wen Zhen XU Feng ZHAO Zhuo Hui ZHAO Jin Zhuo KAN Hai Dong School of Public Health Key Lab of Public Health Safety of the Ministry of EducationFudan University G_RI° CE(research Institute for the Changing global Environment) and Fudan Tyndall Centre Fudan University Department of Dermatology Huashan HospitalFudan University G_RI° CE (research Institute for the Changing global Environment) and Fudan Tyndall Centre Fudan University Shanghai Key laboratory of Atmospheric Particle Pollution and Prevention (LAP~3) Department of Environmental Science & EngineeringFudan University

Objective This study aimed to assess the association between emergency-room visits for respiratory tract infection （RTI） with diurnal temperature range （DTR）, a weather parameter closely associated with urbanization and global climate change. Methods We conducted a semiparametric time-series analysis to estimate the percentage increase in emergency-room visits for RTI associated with changes in DTR after adjustment for daily weather conditions （temperature and relative humidity） and outdoor air pollution. Results DTR was significantly associated with daily emergency-room visits for RTI. An increase of 1 ~C in the current-day （LO） and in the 2-day moving average （L01） DTR corresponded to a 0.94% [95% confidence interval （CI）, 0.34%-1.55%] and 2.08% （95% CI, 1.24%-2.93%） increase in emergency-room visits for RTI, respectively. Conclusion DTR was associated with increased risk of RTI. More studies are needed to understand the impact of DTR on respiratory health.

关键词： Acute respiratory tract infection Diurnal temperature range Time-series

Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

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Chinese Physics C 2014年第10期38卷 82-91页

作者：徐卫李京祎黄森林 W.Z.Wu H.Hao P.Wang Y.K.Wu National Synchrotron radiation laboratory (NSRL) University of Science and Technology of China Dept.of Physics Duke University and FEL labTriangle Universities Nuclear LaboratoryDurhamNC 27708-0308USA Institute of Heavy Ion Physics Peking University

The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers（FELs）, and the High Intensity Gamma-ray Source（HIGS）. It is operated with a beam current ranging from about1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the FEL and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors（BPMs） are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable FEL and HIGS operations.

关键词： beam position monitor signal conditioning closed orbit feedback storage ring FEL

Measurement of Non-Steady Noise and Assessment of Occupational Hearing Loss Based on the Temporal Structure of Noise

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China CDC weekly 2023年第3期5卷 63-67页

作者： Meibian Zhang Anke Zeng Jiarui Xin Xiangjing Gao Wei Qiu Xin Sun National Institute of Occupational Health and Poison Control Chinese Center for Disease Control and PreventionBeijing MunicipalityChina Occupational Health and radiation Protection Institute Zhejiang Provincial Center for Disease Control and PreventionHangzhou CityZhejiang ProvinceChina Zhejiang lab Hangzhou CityZhejiang ProvinceChina

Noise-induced hearing loss(NIHL)has become a global public health problem,and the economic burden of hearing loss caused by noise exposure accounts for 19.6%of the economic burden of all risk factors in the workplace(1).The prevalence of occupational NIHL was estimated to be 10%in relevant occupational population in developed countries and 17%–39%(e.g.,textile and petrochemical industries),and 53%–67%(e.g.,cement and automobile industries)in developing countries in Asia,respectively.(2).In China,occupational noiseinduced deafness has become the second primary occupational disease after pneumoconiosis,with the number of reported cases increasing at an average annual rate of 18.68%from 2010 to 2019(3–4).The prevalence of occupational NIHL in the Chinese occupational population was 21.3%,of which 30.2%was related to high-frequency NIHL(an early sign of NIHL)(2).

关键词： occupational prevalence deafness