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Experimental measurement of double-K fracture parameters of concrete with small-size aggregates

ZHANG Xiufang, XU Shilang, ZHENG Shuang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 4,   Pages 448-457 doi: 10.1007/s11709-007-0061-8

Abstract: The double- fracture model can well describe the development of cracks undergoing during the entire fracture process in concrete. Therefore, it has been selected as the theoretical basis of the Norm for fracture test of

Keywords： development     concrete     theoretical     double- fracture    

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Experimental studies of ash film fractions based on measurement of cenospheres geometry in pulverized

Siqi LIU, Yanqing NIU, Liping WEN, Yang LIANG, Bokang YAN, Denghui WANG, Shi’en HUI

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 91-98 doi: 10.1007/s11708-020-0806-9

Abstract: In pulverized coal particle combustion, part of the ash forms the ash film and exerts an inhibitory influence on combustion by impeding the diffusion of oxygen to the encapsulated char core, while part of the ash diffuses toward the char core. Despite the considerable ash effects on combustion, the fraction of ash film still remains unclear. However, the research of the properties of cenospheres can be an appropriate choice for the fraction determination, being aware that the formation of cenospheres is based on the model of coal particles with the visco-plastic ash film and a solid core. The fraction of ash film is the ratio of the measuring mass of ash film and the total ash in coal particle. In this paper, the Huangling bituminous coal with different sizes was burnt in a drop-tube furnace at 1273, 1473, and 1673 K with air as oxidizer. A scanning electron microscope (SEM) and cross-section analysis have been used to study the geometry of the collected cenospheres and the effects of combustion parameters on the fraction of ash film. The results show that the ash film fraction increases with increasing temperature and carbon conversion ratio but decreases with larger sizes of coal particles. The high fraction of ash film provides a reasonable explanation for the extinction event at the late burnout stage. The varied values of ash film fractions under different conditions during the dynamic combustion process are necessary for further development of kinetic models.

Keywords： ash film fraction     cenospheres     coal combustion     fly ash    

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Determination of the scheme of precision grinding compensation on the radome

GUO Dongming, LIU Minjing, ZHANG Chunbo, SHENG Xianjun, SUN Yuwen

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 3,   Pages 263-266 doi: 10.1007/s11465-007-0045-3

Abstract: An effective approach combining theoretical analysis and mathematical calculations with experimentalmeasurement is presented in this paper to determine the grinding area and allowance for compensating

Keywords： mathematical     effective approach     experimental measurement     antenna     electromagnetic    

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A Train-Bridge Dynamic Interaction Analysis Method and Its Experimental Validation

Nan Zhang, Yuan Tian, He Xia

Engineering 2016, Volume 2, Issue 4,   Pages 528-536 doi: 10.1016/J.ENG.2016.04.012

Abstract: This problem is studied using theoretical analysis, numerical simulation, and experimental study.

Keywords： Train-bridge dynamic interaction     Wheel/rail relationship     Inter-history iteration     Field measurement     Experimental    

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density measurement for plastic injection molding via ultrasonic technology

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0714-2

Abstract: Therefore, in-situ density measurement is of great interest and has significant application valueThis study is the first to propose an in-situ density measurement method using ultrasonic technologyThe proposed method has the advantages of in-situ measurement, non-destructive, high accuracy,

Keywords： ultrasonic measurement     melt density     in-situ measurement     injection molding    

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Experimental studies on the mechanical properties of A95ceramic film by the digital speckle correlation

Yu Shaojuan,Li Yongchi,Liu Haowen

Strategic Study of CAE 2008, Volume 10, Issue 7,   Pages 132-136

Abstract: superhard and superfragile characters will bring many new challenges to researchers, especially in the measurement

Keywords： ceramic materials     digital speckle correlation technique     strain measurement    

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A measurement system for thin elastohydrodynamic lubrication films

WANG Xuefeng, GUO Feng, YANG Peiran

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 2,   Pages 193-196 doi: 10.1007/s11465-007-0032-8

Abstract: An elastohydrodynamic lubrication (EHL) film measurement system using multi-beam interferometry is introducedThe measurement principle and the instrumentation are discussed.It is demonstrated that the presented measurement system can provide continuous measurement of lubricating

Keywords： instrumentation     continuous measurement     elastohydrodynamic lubrication     ultra-thin     measurement    

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Study on direct measurement method of vorticity from particle images

RUAN Xiaodong, FU Xin, YANG Huayong

Frontiers in Energy 2007, Volume 1, Issue 4,   Pages 408-412 doi: 10.1007/s11708-007-0059-1

Abstract: To overcome the shortcomings of conventional methods for vorticity measurement, a new direct measurement

Keywords： conventional     vorticity measurement     particle     DMV     theory    

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Ultrasonic measurement of tie-bar stress for die-casting machine

Frontiers of Mechanical Engineering doi: 10.1007/s11465-021-0663-1

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Requirements in performance measurement systems of construction projects from the lean production perspective

Karina B. BARTH, Carlos T. FORMOSO

Frontiers of Engineering Management 2021, Volume 8, Issue 3,   Pages 442-455 doi: 10.1007/s42524-020-0108-2

Abstract: Performance measurement (PM) generates useful data for process control, facilitates communication betweenIn addition, studies on how lean companies (or projects) use performance measurement and to what extent

Keywords： performance measurement     lean construction     production management     continuous improvement     metrics    

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The adoption of repeated measurement of variance analysis and Shapiro–Wilk test

Frontiers of Medicine 2022, Volume 16, Issue 4,   Pages 659-660 doi: 10.1007/s11684-021-0908-8

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100 Years of Gear Measurement Technology——Review & Prospect

Shi Zhaoyao,Fei Yetai,Xie Huakun

Strategic Study of CAE 2003, Volume 5, Issue 9,   Pages 13-17

Abstract:

The evolution of gear measurement technology in the past 100 years is fully reviewed, and 6 key issuesEmphases are laid on the development of gear measurement principles, the evolution of technical measuresrealizing them and the interpretation & utilization of measurement results.A few of new phenomena in the field of gear measurement technology are remarked, and some research topics

Keywords： gear     gear measurement     gear deviation     gear measuring instrument    

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Single-electromagnet levitation for density measurement and defect detection

Yuhan JIA, Peng ZHAO, Jun XIE, Xuechun ZHANG, Hongwei ZHOU, Jianzhong FU

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1,   Pages 186-195 doi: 10.1007/s11465-020-0608-0

Abstract: The experimental device has an electromagnet in its lower part and a pure iron core in the upper partsingle-electromagnet levitation device has a large measuring range and can realize accurate density measurement

Keywords： single-electromagnet     electromagnetic levitation     density measurement     defect detection    

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Measurement and analysis of tip clearance unsteady flow spectrum in axial-flow fan rotor

LIU Bo, HOU Weimin, MA Changyou, WANG Yangang, ZHOU Qiang

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 448-452 doi: 10.1007/s11708-008-0088-0

Abstract: The dynamic pressure measurement device and test technology are described in this study.

Keywords： development     endwall     unsteady pressure     pressure measurement     experiment    

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A review of measurement methods for peracetic acid (PAA)

Chen Cheng, Haodong Li, Jinling Wang, Hualin Wang, Xuejing Yang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 5, doi: 10.1007/s11783-020-1266-5

Abstract: This review summarizes the measurement and detection methods of peroxyacetic acid, comparing the principle

Keywords： Peroxyacetic acid     Measurement methods     Titration     Colorimetric     Chromatography     NMR    

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Title Author Date Type Operation

Experimental measurement of double-K fracture parameters of concrete with small-size aggregates

ZHANG Xiufang, XU Shilang, ZHENG Shuang

Journal Article

Experimental studies of ash film fractions based on measurement of cenospheres geometry in pulverized

Siqi LIU, Yanqing NIU, Liping WEN, Yang LIANG, Bokang YAN, Denghui WANG, Shi’en HUI

Journal Article

Determination of the scheme of precision grinding compensation on the radome

GUO Dongming, LIU Minjing, ZHANG Chunbo, SHENG Xianjun, SUN Yuwen

Journal Article

A Train-Bridge Dynamic Interaction Analysis Method and Its Experimental Validation

Nan Zhang, Yuan Tian, He Xia

Journal Article

density measurement for plastic injection molding via ultrasonic technology

Journal Article

Experimental studies on the mechanical properties of A95ceramic film by the digital speckle correlation

Yu Shaojuan,Li Yongchi,Liu Haowen

Journal Article

A measurement system for thin elastohydrodynamic lubrication films

WANG Xuefeng, GUO Feng, YANG Peiran

Journal Article

Study on direct measurement method of vorticity from particle images

RUAN Xiaodong, FU Xin, YANG Huayong

Journal Article

Ultrasonic measurement of tie-bar stress for die-casting machine

Journal Article

Requirements in performance measurement systems of construction projects from the lean production perspective

Karina B. BARTH, Carlos T. FORMOSO

Journal Article

The adoption of repeated measurement of variance analysis and Shapiro–Wilk test

Journal Article

100 Years of Gear Measurement Technology——Review & Prospect

Shi Zhaoyao,Fei Yetai,Xie Huakun

Journal Article

Single-electromagnet levitation for density measurement and defect detection

Yuhan JIA, Peng ZHAO, Jun XIE, Xuechun ZHANG, Hongwei ZHOU, Jianzhong FU

Journal Article

Measurement and analysis of tip clearance unsteady flow spectrum in axial-flow fan rotor

LIU Bo, HOU Weimin, MA Changyou, WANG Yangang, ZHOU Qiang

Journal Article

A review of measurement methods for peracetic acid (PAA)

Chen Cheng, Haodong Li, Jinling Wang, Hualin Wang, Xuejing Yang

Journal Article