检索结果-南通市图书馆

Low-cost and efficient Mn/CeO_(2) catalyst for photocatalytic VOCs degradation via scalable colloidal solution combustion synthesis method

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第21期116卷 169-179页

作者： Yingguang Zhang Muyan wu Yifei wang Xiaolong Zhao dennis Y.C.Leung Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongChina School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518000China

Colloidal solution combustion synthesis(CSCS)is a simple and easy method for mass-production of crystalline nanomaterials with tunable pore *** this work,mesoporous Mn/CeO_(2) catalysts were fabricated via CSCS method coupled with a dip-coating process and used for photocatalytic oxidation(PCO)of *** vacuum ultraviolet(VUV)irradiation,a high toluene removal efficiency of about 92%was achieved with a toluene reaction rate of about 118μmol/g/h in a continuous flow reactor.A possible degradation pathway was proposed based on the analysis of intermediates by Fourier transform infrared photoluminescence spectra(FTIR)and *** temperature-programmed reduction(H_(2)-TPR),Brunauer-Emmett-Teller(BET)surface areas,photoluminescence spectra(PL)spectra and X-ray photoelectron spectroscopy(XPS)were carried out to analyze physical and chemical properties of the *** with Mn_(x)Ce_(1-x)O_(2) catalysts synthesized by one step CSCS method,Mn/CeO_(2) has a higher photocatalytic activity,which is attributed to the presence of higher contents of Ce^(3+),Mn^(2+)and Mn^(3+)*** presence of higher contents of these species plays a key role in the activity enhancement of toluene oxidation and ozone *** method is facile,efficient and scalable,and it may become a promising industrial application technology for catalyst synthesis in the near future.

关键词： Mesoporous CeO_(2) Manganese modification Scalable synthesis Photocatalysis VOCs abatement

The west in the world A Mid-Length Narrative History: Renaissance to Present dennis Sherman, Joyce Salisbury 2nd ed.; Updated.

在线全文

学校读者我要写书评

暂无评论

Quasi-exactly solvable decatic model description of nuclei near the X(5) critical point

2006年

作者： dennis Sherman Joyce Salisbury

Includes bibliographical references and index.

ISBN: (纸本)007297320X

Includes bibliographical references and index.

关键词： Civilization western

来源：畅想之星图书光盘版（南... 畅想之星图书光盘版（南... 评论

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第1期74卷 46-56页

作者： Hadi Sobhani Hassan Hassanabadi dennis Bonatsos Feng Pan Jerry P Draayer Department of Physics Liaoning Normal UniversityDalian 116029China Faculty of Physics Shahrood University of TechnologyShahroodIran Institute of Nuclear and Particle Physics National Centre for Scientific Research‘Demokritos’GR-15310 Aghia ParaskeviAttikiGreece Department of Physics and Astronomy Louisiana State UniversityBaton RougeLA 70803-4001United States of America

The Bohr Hamiltonian with axially deformed shape confined in a quasi-exactly solvable decatic β-part potential is *** is shown that the decatic model can well reproduce the X(5)model results as far as the energy ratios in the ground and beta band and related B(E2)values are *** results to the low-lying energy ratios and relevant B(E2)values of even-even X(5)candidates ^(150)Nd,^(156)Dy,^(164)Yb,^(168)Hf,^(174)Yb,^(176,178,180)Os,and ^(188,190)Os show that the decatic model provides the best fitting results for the energy ratios,while the X(5)model is the best at reproducing the B(E2)values of these nuclei,in which the beta-bandhead energy is lower than that of the gamma *** for even-even nuclei,such as ^(154,156,158)Gd,with bandhead energies of the beta and gamma bands more or less equal within the X(5)critical point to the axially deformed region,our numerical analysis indicates that the decatic model is better than the X(5)model in describing both the low-lying level energies and related B(E2)values.

关键词： Bohr Hamiltonian the decatic potential X(5)critical point

城市电动自行车设计,当极简主义遇见使用质量

在线全文

学校读者我要写书评

暂无评论

工业设计 2024年第1期 23-23页

作者： Alexander Forst dennis Fiedler 不详

这款城市电动自行车从轻巧与创新的车架结构、流畅的造型语言、惊人的高度集成,到出色的设计和制造质量,在各个层面上都达到了非常高的质量标准。盘式制动器、灯和遥控器的电缆巧妙地藏在车体内,将操作刹车的杠杆支架集成在车把中,将照... 详细信息

这款城市电动自行车从轻巧与创新的车架结构、流畅的造型语言、惊人的高度集成,到出色的设计和制造质量,在各个层面上都达到了非常高的质量标准。盘式制动器、灯和遥控器的电缆巧妙地藏在车体内,将操作刹车的杠杆支架集成在车把中,将照明系统完全集成在车架中。此外,重量轻、紧凑的电机还与下管无缝融合,使整辆车充满动感、极致简约。

关键词：电动自行车极简主义盘式制动器照明系统车架结构无缝融合质量标准遥控器

维普期刊数据库博看期刊

一种能实现单频PPP-RTK的GNSS局域参考网数据处理算法

在线全文

学校读者我要写书评

暂无评论

地球物理学报 2015年第7期58卷 2306-2319页

作者：张宝成 ODIJK dennis 中国科学院测量与地球物理研究所动力大地测量学国家重点实验室武汉430077 GNSS Research Centre Department of Spatial SciencesCurtin University

全球范围内大量布设的GNSS（Global Navigation Satellite System）参考网为精密定位、导航和授时等应用提供了丰富的数据资源.基于局域参考网,先后发展了若干侧重实现双频精密定位的技术,如NRTK（Network Real Time Kinematic）,PPP（P... 详细信息

全球范围内大量布设的GNSS（Global Navigation Satellite System）参考网为精密定位、导航和授时等应用提供了丰富的数据资源.基于局域参考网,先后发展了若干侧重实现双频精密定位的技术,如NRTK（Network Real Time Kinematic）,PPP（Precise Point Positioning）和PPP-RTK等.其中,PPP-RTK融合了NRTK和PPP的技术优势,是目前相关研究的热点.本文改进了利用局域参考网提取各类改正信息的算法,以便于实现单频PPP-RTK,具体步骤包括：1）逐参考站实施非组合PPP,并固定已知站星距和卫星钟差,预估电离层延迟、浮点模糊度等参数;2）联合所有参考站的PPP模糊度预估值,通过重新参数化,形成一组双差整周模糊度和接收机、卫星相位偏差;3）固定双差整周模糊度,精化求解卫星相位偏差和各参考站PPP电离层延迟.基于网解中用到的卫星轨道和钟差,以及网解所提供的卫星相位偏差和（内插的）电离层延迟,参考网内的单频流动站即可实施PPP-RTK.基于澳大利亚某连续运行参考站网和流动站的实测数据,考察了：1）参考网数据处理中,双差模糊度的固定成功率（98.89%）和卫星相位偏差估值的时间稳定性（各连续弧段优于0.2周）;2）流动站处电离层延迟的内插精度（优于10cm）;3）单天内任一历元起算,固定静态（动态）单频PPP整周模糊度所需时长（均不超过10min）;4）模糊度固定前后,单频动态PPP的定位精度（模糊度固定后,平面和天顶RMS分别优于5cm和10cm;模糊度固定前,相应RMS仅为28～53cm）.

关键词：单频PPP-RTK 卫星相位偏差电离层延迟整周模糊度固定

Endoscopic ultrasound guided gastrojejunostomy for gastric outlet obstruction

在线全文

学校读者我要写书评

暂无评论

world Journal of Gastrointestinal Surgery 2021年第7期13卷 620-632页

作者： Sebastian Stefanovic Peter V Draganov dennis Yang Department of Gastroenterology and Hepatology University Medical Center LjubljanaLjubljana 1000Slovenia Division of Gastroenterology Hepatologyand NutritionUniversity of Florida College of MedicineGainesvilleFL 32608United States

Gastric outlet obstruction(GOO)is a clinical syndrome secondary to luminal obstruction at the level of the stomach and/or *** can be caused by either benign or malignant etiologies,often resulting in early satiety,nausea,vomiting and poor oral *** is associated with decreased quality of life and has been shown to significantly impact survival in patients with advanced *** treatment options for GOO can be broadly divided into surgical[surgical gastrojejunostomy(GJ)]and endoscopic interventions(dilation and/or placement of luminal self-expanding metal stents).while surgical GJ has been shown to provide a more lasting relief of symptoms when compared to luminal stenting,it has also been associated with a higher rate of adverse ***,many patients with advanced metastatic disease are not good surgical *** recently,endoscopic ultrasound(EUS)-guided GJ has emerged as a potential alternative to traditional surgical and endoscopic *** review focuses on the new advances and technical aspects of EUS-GJ and clinical outcomes in the management of both benign and malignant disease.

关键词： Gastric outlet obstruction Interventional endoultrasonography Gastrojejunostomy Duodenal stenting Balloon dilatation

Antitumor immunity induced by the photodynamic action of BAM-SiPc,a silicon(IV)phthalocyanine photosensitizer

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

Cellular & Molecular Immunology 2019年第7期16卷 676-678页

作者： Ying Zhang dennis K.P.Ng wing-Ping Fong School of Life Sciences The Chinese University of Hong KongHong KongChina Department of Chemistry The Chinese University of Hong KongHong KongChina

Photodynamic therapy(PDT)is a promising approach to treat cancer.1 It involves the use of three individually nontoxic substances to produce a toxic effect.A photosensitizer,when illuminated with light of an appropriate wavelength,will be activated and convert molecular oxygen into reactive oxygen species(ROS),which can then kill tumor *** success of PDT depends on its potency as well as the targeting of the photosensitizer to the tumor site.2 For example,in photoimmunotherapy,the photosensitizer is conjugated to monoclonal antibodies that direct the photosensitizer to tumor cells that express the specific antigen recognized by the antibodies,and the tumor cells are killed upon light irradiation of the tumor site.3 This direct cytotoxicity is useful in treating localized tumor;however,it has limited applicability when metastasis *** this regard,the activation of antitumor immunity appears to be more promising because most cancer patients die,not from localized tumor,but from cancer metastasis and relapse.

关键词： immunity metastasis cancer

GO-modified flexible polymer nanocomposites fabricated via 3D stereolithography

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

Frontiers of Chemical Science and Engineering 2019年第4期13卷 736-743页

作者： Chi Him Alpha Tsang Adilet Zhakeyev dennis Y.C.Leung Jin Xuan School of Environmental Sciences and Engineering Sun Yat-Sen UniversityGuangzhou 510006China Department of Mechanical Engineering The University of Hong KongHong KongChina Department of Chemical Engineering Loughborough UniversityLoughboroughLE113TUUK

Graphene oxide(GO)induced enhancement of elastomer properties showed a great deal of potential in recent years,but it is still limited by the barrier of the complicated synthesis ***(SLA),used in fabrication of thermosets and very recently in“flexible”polymers with elastomeric properties,presents itself as simple and user-friendly method for integration of GO into *** this work,it was first time demonstrated that GO loadings can be incorporated into commercial flexible photopolymer resins to successfully fabricate GO/elastomer nanocomposites via readily accessible,consumer-oriented SLA *** material properties of the resulting polymer was characterized and *** mechanical strength,stiffness,and the elongation of the resulting polymer decreased with the addition of *** thermal properties were also adversely affected upon the increase in the GO content based on differential scanning calorimetry and thermogravimetric analysis *** was proposed that the GO agglomerates within the 3D printed composites,can result in significant change in both mechanical and thermal properties of the resulting *** study demonstrated the possibility for the development of the GO/elastomer nanocomposites after the optimization of the GO/“Hexible”photoreactive resin formulation for SLA with suitable annealing process of the composite in future.

关键词： graphene oxide polymer flexible 3D printing stereolithography

Evaluation of cable tension sensors of FAST reflector from the perspective of EMI

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

High Technology Letters 2016年第2期22卷 135-141页

作者：朱明 wang Qiming dennis Egan wu Mingchang Sun Xiao National Astronomical Observatories Chinese Academy of SciencesBeijing 100012P.R.China National Radio Astronomy Observatory PO Box 2Green BankWV 24944USA

The active reflector of FAST （ five-hundred-meter aperture spherical radio telescope） is suppor- ted by a ring beam and a cable-net structure, in which nodes are actively controlled to form series of real-time paraboloids. To ensure the security and stability of the supporting structure, tension must be monitored for some typical cables. Considering the stringent requirements in accuracy and long- term stability, magnetic flux sensor, vibrating wire strain gauge and fiber bragg grating strain gauge are screened for the cable tension monitoring of the supporting cable-net. Specifically, receivers of radio telescopes have strict restriction on electro magnetic interference （EMI） or radio frequency in- terference （RFI）. These three types of sensors are evaluated from the view of EMIfRFI. Firstly, these fundamentals are theoretically analyzed. Secondly, typical sensor signals are collected in the time and analyzed in the frequency domain, which shows the characteristic in the frequency domain. Finally, typical sensors are tested in an anechoic chamber to get the EMI levels. Theoretical analysis shows that Fiber Bragg Grating strain gauge itself will not lead to EMI/RFI. According to GJB151 A, frequency domain analysis and test results show that for the vibrating wire strain gauge and magnetic flux sensor themselves, testable EMIfRF1 levels are typically below the background noise of the ane- choic chamber. FAST finally choses these three sensors as the monitoring sensors of its cable ten- sion. The proposed study is also a reference to the monitoring equipment selection of other radio tele- scopes and large structures.

关键词： five-hundred-meter aperture spherical radio telescope (FAST) cable tension mo-nitoring magnetic flux vibrating wire fiber Bragg electro magnetic interference (EMI)