检索结果-南通市图书馆

Journal of Hydrodynamics 2012年第5期24卷 658-667页

作者： LEE Jeung-Hoon JUNG Jae-Kwon LEE Kyung-Jun HAN Jae-Moon park Hyung-gil SEO Jong-Soo Samsung Ship Model Basin(SSMB) Marine Research InstituteSamsung Heavy IndustriesScience TownDaejeon 305-380Korea

Tip vortex cavitation noise of marine propeller became primary concems to reduce hazardous environmental impacts from commercial ship or to keep the underwater surveillance of naval ships. The investigations of the tip vortex and its induced noise are normally conducted through the model test in a water cavitation tunnel. However the Reynolds number of model-test is much smaller than that of the full-scale, which subsequently results in the difference of tip vortex cavitation inception. Hence, the scaling law between model- and full-scales needs to be identified prior to the prediction and assessment of propeller noise in full scale. From previous researches, it is generally known that the incipient caivtation number of tip vortex can be represented as a power of the Reynolds number. However, the power exponent for scaling, which is the main focus of this research, has not been clearly studied yet. This paper deals with the estimation of scaling exponent based on tip vortex cavitation inception test in both full- and model-scale ships. Acoustical measurements as well as several kind of signal processing technique for an inception criterion suggest the scaling exponent as 0.30. The scaling value proposed in this study shows slight difference to the one of most recent research. Besides, extrapolation of model-ship noise measurement using the proposed one predicts the full-scale noise measurement with an acceptable discrepancy.

关键词： tip vortex cavitation underwater radiated noise scaling exponent

在线全文

学校读者我要写书评

暂无评论

年产500t玉米低聚肽粉工厂设计

中国调味品 2024年第2期49卷 121-128页

作者：崔鹏飞李暮玥宋春美刘金鑫许昌学院食品与药学院河南许昌461000

玉米低聚肽具有抗氧化、降血糖和保肝等生理功能,其在食品、医药和保健品等领域应用广泛。文章旨在设计年产500 t玉米低聚肽粉工厂,厂址选择在河南省驻马店市国际农产品加工产业园。采用超声辅助酶解、活性炭吸附、膜分离和喷雾干燥技... 详细信息

玉米低聚肽具有抗氧化、降血糖和保肝等生理功能,其在食品、医药和保健品等领域应用广泛。文章旨在设计年产500 t玉米低聚肽粉工厂,厂址选择在河南省驻马店市国际农产品加工产业园。采用超声辅助酶解、活性炭吸附、膜分离和喷雾干燥技术制备玉米低聚肽粉产品。确定了厂区总平面设计、工艺设计、物料衡算、设备选型、环境保护设计以及技术经济分析。最终得到该厂占地7221 m2,全厂65名工作人员,年产500 t玉米低聚肽粉,日产2.2 t,产品规格为10 kg/袋,市场定价为1400元/袋。该项目总投资为4131.22万元,年生产成本为3296.6万元,年销售额为9240万元,每年净利润约为2787.7万元,投资回收期较短,3.98年即能回收,工厂能够获得良好的经济效益。

关键词：玉米低聚肽粉物料衡算工厂设计经济分析工艺流程

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

叉车制动系统的检验方法及其制动力分析

机电工程技术 2024年第6期53卷 253-256,281页

作者：朱云锋蒋春李海波广西壮族自治区特种设备检验研究院南宁530299 山西省检验检测中心(山西省标准计量技术研究院) 太原030001

为了确保叉车制动系统的制动性能良好,使叉车能有效地减速或驻停,保护驾驶员生命安全,对制动系统的检验方法和制动性能进行了研究。首先从叉车的驾驶方式、制动系统的组成结构两方面进行了详细阐释;然后根据《场(厂)内专用机动车辆安全... 详细信息

为了确保叉车制动系统的制动性能良好,使叉车能有效地减速或驻停,保护驾驶员生命安全,对制动系统的检验方法和制动性能进行了研究。首先从叉车的驾驶方式、制动系统的组成结构两方面进行了详细阐释;然后根据《场(厂)内专用机动车辆安全技术规程》(TSG 81—2022)相关条款,总结了制动系统检验的要求、目的、方法;进一步结合叉车车轮产生滑移现象的原因,分析了制动性能指标-制动力。在此基础上,针对如何保持叉车制动系统的制动性能良好提出了见解,如可以围绕自行检查、维护保养、规范拆装、应急处理4个层面建立常态化管护机制,能有效防范制动系统失效,预防和减少叉车发生安全事故。为叉车制动系统的检验、制造、修理提供了重要参考价值。

关键词：制动系统驾驶方式组成结构检验制动力制动性能

维普期刊数据库博看期刊

Electrically focus-tuneable ultrathin lens for high-resolution square subpixels

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 1066-1078页

作者： Sehong park gilho Lee Byeongho park Youngho Seo Chae bin park Young Tea chun Chulmin Joo Junsuk Rho Jong Min Kim James Hone Seong Chan Jun School of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Electrical Engineering Division Engineering DepartmentUniversity of Cambridge9 JJ Thomson AvenueCambridge CB3 OFAUK Department of Electronic Material Engineering Korea Maritime and Ocean UniversityBusan 49112Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Department of Mechanical Engineering Columbia University500 West 120th StreetMudd 220New YorkNY 10027USA

Owing to the tremendous demands for high-resolution pixel-scale thin lenses in displays,we developed a graphenebased ultrathin square subpixel lens(USSL)capable of electrically tuneable focusing(ETF)with a performance competitive with that of a typical mechanical refractive *** fringe field due to a voltage bias in the graphene proves that our ETF-USSL can focus light onto a single point regardless of the wavelength of the visible light—by controlling the carriers at the Dirac point using radially patterned graphene layers,the focal length of the planar structure can be adjusted without changing the curvature or position of the lens.A high focusing efficiency of over 60% at a visible wavelength of 405 nm was achieved with a lens thickness of <13 nm,and a change of 19.42% in the focal length with a 9% increase in transmission was exhibited under a driving *** design is first presented as an ETF-USSL that can be controlled in pixel units of flat panel displays for visible *** can be easily applied as an add-on to high resolution,slim displays and provides a new direction for the application of multifunctional autostereoscopic displays.

关键词： visible driving competitive

基于TLGWO-SVM的光纤Bragg光栅传感器故障诊断

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

武汉理工大学学报 2024年第6期46卷 129-136页

作者：李锦陈静肖纯刘晖刘岩武汉理工大学自动化学院武汉430070 国家能源氢能及氨氢融合新能源技术重点实验室佛山仙湖实验室佛山528200 武汉理工大学土木工程与建筑学院武汉430070 武汉理工大学三亚科教创新园三亚572025

为了快速准确地识别光纤Bragg光栅(FBG)传感器故障,提出一种基于教与学算法改进灰狼算法优化支持向量机的故障诊断方法。该方法首先利用经验模态分解将信号分解为若干个本征模态函数,并计算其对应的多尺度近似熵,从而得到故障特征向量;... 详细信息

为了快速准确地识别光纤Bragg光栅(FBG)传感器故障,提出一种基于教与学算法改进灰狼算法优化支持向量机的故障诊断方法。该方法首先利用经验模态分解将信号分解为若干个本征模态函数,并计算其对应的多尺度近似熵,从而得到故障特征向量;其次,构建支持向量机故障诊断模型,利用教与学改进的灰狼算法对支持向量机的参数进行迭代寻优;最后,将FBG传感器的原始测量信号输入故障诊断模型,可以有效区分传感器正常状态和啁啾故障状态,并与广泛使用的算法进行了对比分析。结果表明,该方法能够更精准、更迅速地对FBG传感器的故障进行识别,具有一定的工程参考价值。

关键词：光纤Bragg光栅传感器故障诊断经验模态分解近似熵灰狼算法支持向量机

Rheological,textural,and functional characteristics of 3D-printed cheesecake containing guava leaf,green tea,and barley sprout powders

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2022年第3期47卷 338-345页

作者： Ye-Eun park Jeong Kim Hyun Woo Kim Jiyeon chun Department of Food Science and Technology Sunchon National UniversitySuncheon57922Republic of Korea Department of Biotechnology College of Life Science and BiotechnologyKorea UniversityAnam-dongSeongbuk-guSeoul02841Republic of Korea Kimchi Science and Industrialization Institute Sunchon National UniversitySuncheon57922Republic of Korea

The use of 3D food printing as an alternative to manufacturing customized food is gaining *** this study,functional powders of guava leaf (GL),green tea (GT),and barley sprouts (BS) were tested as edible ink ingredients for printing cheesecake,and their physicochemical and functional properties were *** size and water and oil holding capacities were highest in GL powder,whereas the water-soluble index was highest in *** functional powder-added cheesecake,pseudoplastic and shear-thinning behavior was observed which is ideal for 3D *** shear modulus (1.87 kPa) of the control cheesecake (without functional powder) was significantly increased to 5 kPa or higher by adding functional *** in vitro glycemic index was lowest in GL cheesecake,whereas antioxidant activity and polyphenol content were highest in GT *** and GT powders would be beneficial as an edible ink to improve functional properties,such as antioxidant activity for GT and blood-glucose-lowering effect for BS,with enhanced printability and textural stability of 3D printed cheesecake.

关键词： 3D food print Guava Green tea Barley sprout Cheesecake

Design and evaluation of nicorandil extended-release tablet

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 Pharmaceutical Sciences 2015年第2期10卷 108-113页

作者： Ju-Young Kim chun-Woong park Beom-Jin Lee Eun-Seok park Yun-Seok Rhee College of Pharmacy Woosuk UniversityWanju-gun 565-701Republic of Korea College of Pharmacy Chungbuk National UniversityCheongju 361-763Republic of Korea College of Pharmacy Ajou UniversitySuwon 443-749Republic of Korea School of Pharmacy Sungkyunkwan UniversitySuwon 440-746Republic of Korea College of Pharmacy and Research Institute of Pharmaceutical Sciences Gyeongsang National UniversityJinju 660-701Republic of Korea

The aim of this study was to design and evaluate extended-release formulations of a model drug,nicorandil,in order to achieve the desired steady-state plasma concentration of drug in *** was employed to estimate optimum dissolution and absorption rate of *** dissolution test was employed using pH 1.2,4.0,6.8 buffer solution,or water,to measure the in vitro release behaviors of nicorandil formulations.A single dose(15 mg)of each formulation was orally administered to four beagle dogs under fasted conditions,and the pharmacokinetic parameters were *** in vitro/in vivo relationship of the extended-release formulation was confirmed using in vitro dissolution profiles and plasma concentrations of drug in beagle *** was released completely within 30 min from the immediate-release tablets and released for 24 h from the extended-release *** nicorandil plasma concentration could be modified by adjusting the drug release rate from the extended-release *** release rate of nicorandil was the rate-limiting step in the overall absorption of drug from the extendedrelease *** results highlight the potential of a nicorandil extended-release formulation in the treatment of angina pectoris.

关键词： Nicorandil In vitro In vivo Pharmacokinetic Extended-release

Dipole-assisted carrier transport in bis(trifluoromethane) sulfonamide-treated O-ReS_(2) field-effect transistor

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 2021年第7期14卷 2207-2214页

作者： Jae Young park SangHyuk Yoo Byeongho park Taekyeong Kim Young Tea chun Jong Min Kim Keonwook Kang Soo Hyun Lee Seong Chan Jun Department of Mechanical Engineering Yonsei UniversitySeoul 03722Republic of Korea Center for Biomicrosystem Brain Science InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Sensor System Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Physics Hankuk University of Foreign StudiesYongin 17035Republic of Korea Division of Electronics and Electrical Information Engineering Korea Maritime and Ocean UniversityBusan 49112Republic of Korea Electrical Engineering Division Engineering Department University of CambridgeCambridgeCB3 OFAUK

We demonstrate the dipole-assisted carrier transport properties of bis(trifluoromethane)sulfonamide(TFSI)-treated O-ReS_(2) field-effect *** ReS_(2) was compared with defect-mediated ReS_(2) to confirm whether the presence of defects on the interface enhances the interaction between O-ReS_(2) and TFSI *** to the experiment,density functional theory(DFT)calculation was performed,and the result indicated that the charge transfer between TFSI and O-ReS_(2) is more sensitive to external electric fields than that between TFSI and pristine ReS_(2).After TFSI treatment,the drain current of O-ReS_(2) FET was significantly increased up to 1,113.4 times except in the range of−0.32–0.76 V owing to Schottky barrier modulation from dipole polarization of TFSI molecules,contrary to a significant degradation in device performance in pristine ReS_(2) ***,in the treated O-ReS_(2) device,the dipole direction was highly influenced by the voltage sweep direction,generating a significant area of hysteresis in I–V and transfer characteristics,which was further verified by the surface potential ***,the dipole state was enhanced according to the wavelength of the light source and *** results indicate that TFSI-treated ReS_(2) FET has large potential for use as next-generation memristor,memory,and photodetector.

关键词： Two-dimensional material ReS_(2) field-effect transistor TFSI superacid dipole

Effects of irradiation on superconducting properties of small-grained MgB_(2) thin films

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 Physics B 2023年第12期32卷 534-540页

作者：刘丽 Jung Min Lee Yoonseok Han Jaegu Song Chorong Kim Jaekwon Suk Won Nam Kang 刘杰 Soon-gil Jung Tuson park Center for Quantum Materials and Superconductivity(CQMS) Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Institute of Modern Physics Chinese Academy of Sciences(CAS)Lanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of Sciences(UCAS)Beijing 100049China Korea Multi-purpose Accelerator Complex Korea Atomic Energy Research InstituteGyeongjuGyeongbuk 38180Republic of Korea Department of Physics Education Sunchon National UniversitySuncheon 57922Republic of Korea

We investigate the effect of ion irradiation on MgB_(2) thin films with small grains of approximately 122 nm and 140 *** flux pinning by grain boundaries is insignificant in the pristine MgB_(2) films due to good inter-grain connectivity,but is significantly improved after 120-keV Mn-ion *** scaling behavior of the flux pinning force density for the ion-irradiated MgB_(2) thin films with nanoscale grains demonstrates the predominance of pinning by grain boundaries,in contrast to the single-crystalline MgB_(2) films where normal point pinning was dominant after low-energy ion *** results suggest that irradiation-induced defects can accumulate near the grain boundaries in metallic MgB_(2) superconductors.

关键词： MgB_(2)films grain boundaries flux pinning low-energy ion irradiation

Evaluation of characteristics on titanium surface treatment for absorption of functional groups

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第21期123卷 3132-3136页

作者： JIN Guang-chun park Rl-song park Hyeoung-ho SEO Jae-min LEE Sook-jeong LEE Min-ho School of Stomatology Binzhou Medical University Binzhou Shandong 264003 China Department of Dental Biomaterials and Institute of Oral Bioscience School of Dentistry BK21 Project Chonbuk National University Jeonju Korea Neural Injury Research Lab Department of Neurology Asan Life Science Institute University of Ulsan College of Medicine Seoul Korea

Background In order to bind or fix bioactive materials directly to the surface of a Ti implant, the prior binding process of functional groups （FGs, -COOH and -OH） to the implant surface is necessary. Conventional binding processes are so high-cost and complex, so it is essential to find a simple and effective procedure for Ti-FG *** Various electrolyte compositions and electrochemical processing were adopted in this study to develop a relatively simple and effective Ti-FG binding process. The ability of Ti-FG binding and calcium （Ca）/phosphorous （P）absorption and corrosion resistance were evaluated according to various titanium surface treatment in electrolyte involving -COOH and -OH ion by using X ray photoelectron spectroscopy （XPS）, field emission scanning electron microscope （FE-SEM） and potentiodynamic scan method *** In cases of -COOH, the anodic oxidation process （AN） showed an effective binding ability between -COOH and Ti surface. On the other hand, in cases of -OH, there were no significant differences in the result between the conditions used. In regard to the absorption of Ca and P on Ti surface, there was a minimal amount of Ca absorbed but no P was absorbed. The anodic oxidation series showed homogenous corrosion, whereas the electrolyte immersion （EL）series showed unstable corrosion. Although EL-OH showed a novel corrosion potential, the EL-COOH series showed good corrosion resistance over the anodic potential *** The ability of binding between FG and the Ti surface and Ca/P absorption were strongly associated with the surface potential （ξ, potential）, which was dependent on the pH of the electrolyte. Accordingly, in order to achieve the effective absorption of various FGs on the Ti surface, it is needed to develop the combination process in addition to the electric affinity, relation with the ξ, potential.

关键词： titanium plate anodic oxidation ξpotential Ecorr icorr