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Performance evaluation of near real-time condition monitoring in haul trucks

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International Journal of Mining Science and Technology 2020年第6期30卷 909-915页

作者： Hemanth Reddy Alla Robert Hall Derek B.Apel University of Alberta Edmonton T6G 2H5Canada

Strategic maintenance plays a key role in ensuring high availability and utilization of the haul trucks,and as equipment began to grow more complex towards the end of the 20th century,there was a need for a proactive maintenance strategy,which led to the development of condition-based *** condition monitoring(RTCM)is the ability to perform condition monitoring in real-time and has the ability to alert maintenance and operations of abnormal *** alarms can be used as an indication leading to a problem,and if a suitable corrective action is initiated in time,it could result in significant savings of equipment downtime and repair *** study aims to compare some maintenance performance indicators prior to and after implementation of RTCM strategy at a mine site using some tests of statistical *** study also indicated the presence of seasonality in the data,and thus the data was deseasonalized and detrended prior to being subjected to the statistical ***,the results indicated that RTCM strategy has proven to be successful in improving the availability for some of the failure categories chosen in this study.

关键词： Haul trucks Real-time condition monitoring Performance indicators

Relationship between microstructure and hydrogen induced cracking behavior in a low alloy pipeline steel

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Journal of Materials Science & Technology 2017年第12期33卷 1504-1512页

作者： Jing Li Xiuhua Gao Linxiu Du Zhenguang Liu State Key Laboratory of Rolling and Automation Northeastern University5henyang 110819China

Hydrogen induced cracking（HIC） behaviors of a high strength pipeline steel with three different microstructures, granular bainite ＆ lath bainite（GB ＋ LB）, granular bainite ＆ acicular ferrite（GB ＋ AF）, and quasi-polygonal ferrite（QF）, were studied by using corrosion experiment based on standard NACE TM0284. The HIC experiment was conducted in hydrogen sulfide（H_2S）-saturated solution. The experimental results show that the steel with GB ＋ AF and QF microstructure present excellent corrosion resistance to HIC, whereas the phases of bainite lath and martensite/austenite in LB ＋ GB microstructure are responsible for poor corrosion resistance. Compared with ferrite phase, the bainite microstructure exhibits higher strength and crack susceptibility of HIC. The AF ＋ GB microstructure is believed to have the best combination of mechanical properties and resistance to HIC among the designed steels.

关键词： Pipeline steel Microstructure Hydrogen induced cracking (HIC) Corrosion resistance

Numerical Simulation of Flapping Wing MAVs in V-formation

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Journal of Bionic Engineering 2019年第2期16卷 264-280页

作者： Wee-Beng Tay Kishen Raj Murugaya Woei-Leong Chan Boo-Cheong Khoo Temasek Laboratories National University of Singapore5A Engineering Drive 1117411Republic of Singapore Department of Mechanical Engineerings National University of Singapore 5A Engineering Drive 1117411Republic of Singapore

The purpose of this research is to understand the aerodynamics of Flapping wing Micro Aerial Vehicles(FMAVs)flying in V-formation and how V-fbrmation can improve the endurance of *** tested FMAVs with two types of flapping kinematics:(1)idealized sinusoidal flapping/pitching motion,(2)actual FMAV wing deformation *** the design of experiment methodology,together with an immersed boundary method numerical solver,we investigate the effects of phase angle and x,v,z separation between the wings on the FMAVs'*** show that it is possible to obtain an overall thrust and lift improvement of up to 25%and 14%respectively,or a reduction of both 19%,compared to the single wing ***,for certain cases,we extend another row,leading to a total of five *** show that in general,the additional thrust or lift experienced by the second row of wings is also experienced by the third row of ***,this may apply to subsequent rows too.

关键词： flapping wing V-fbrmation immersed boundary methods MAV design of experiment

Effect of particle stress tensor in simulations of dense gas-particle flows in fluidized beds

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Particuology 2018年第3期16卷 31-43页

作者： Mohammad Reza Haghgoo Donald J. Bergstrom Raymond J. Spiteri Department of Mechanical Engineering University of Saskatchewan Saskatoon SK SFN 5A9 Canada Department of Computer Science University of Saskatchewan Saskatoon. SK S7N 5C9 Canada

A two-fluid model based on the kinetic theory of granular flow for the rapid-flow regime and the Coulomb friction law for the quasi-static regime is applied to predict the hydrodynamics of dense gas-particle flow in a three-dimensional fluidized bed. Two different models for the particle stress tensor that use different constitutive equations in the elastic-inertial regime are examined to assess their ability to predict bed dynamics. To understand how particle stress models affect structural features of the flow, a quantitative analysis is performed on some important aspects of the mechanics of bubbling beds that have received relatively little attention in the literature. Accordingly, different flow regimes are identified in the context of fluidized beds through the dimensionless inertial number, and the main characteristics of each regime are discussed. In addition, how the particle stress tensor manifests itself in the bubble characteristics, natural frequency of the bed, and particle Reynolds stress are investigated, all of which help to better understand the complex dynamics of the fluidized bed. The numerical results are validated against pub- lished experimental data and demonstrate the significant role of the stress tensor in the elastic-inertial regime.

关键词： Two-fluid model Inertial number Fluidized bed Flow regime Particle Reynolds stress MFIX

Voyage inside the cell:Microsystems and nanoengineering for intracellular measurement and manipulation

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Microsystems & Nanoengineering 2015年第1期1卷 82-96页

作者： Jun Liu Jun Wen Zhuoran Zhang Haijiao Liu Yu Sun Department of Mechanical and Industrial Engineering University of Toronto5 King’s College RoadTorontoON M5S 3G8Canada

Properties of organelles and intracellular structures play important roles in regulating cellular functions,such as gene expression,cell motility and *** ability to directly interrogate intracellular structures inside a single cell for measurement and manipulation has significant implications in the understanding of subcellular and suborganelle activities,diagnosing diseases,and potentially developing new therapeutic *** the past few decades,a number of technologies have been developed to study single-cell ***,methods of measuring intracellular properties and manipulating subcellular structures have been largely *** to the even smaller size of intracellular targets and lower signal-to-noise ratio than that in wholecell studies,the development of tools for intracellular measurement and manipulation is *** paper reviews emerging microsystems and nanoengineered technologies for sensing and quantitative measurement of intracellular properties and for manipulating structures inside a single *** progress and limitations of these new technologies as well as new discoveries and prospects are discussed.

关键词： atomic force microscopy(AFM) fluorescent proteins and molecules intracellular manipulation intracellular measurement MEMS nanoparticle nanotube nanowire

Role of phosphorylated Smad3 signal components in intraductal papillary mucinous neoplasm of pancreas

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Hepatobiliary & Pancreatic Diseases International 2020年第6期19卷 581-589页

作者： Yuichi Hori Tsukasa Ikeura Takashi Yamaguchi Katsunori Yoshida Koichi Matsuzaki Mitsuaki Ishida Sohei Satoi Kazuichi Okazaki Department of Gastroenterology and Hepatology Kansai Medical University2-5-1 ShinmachiHirakataOsaka 5731191Japan Department of Pathology Kansai Medical University2-5-1 ShinmachiHirakataOsaka 5731191Japan Department of Surgery Kansai Medical University2-5-1 ShinmachiHirakataOsaka 5731191Japan

Background:Malignant intraductal papillary mucinous neoplasm(IPMN)has poor *** carcinogenesis of IPMN is not *** aim of this study was to clarify transitions in phosphorylated Smad3 signaling during IPMN ***:By using immunohistochemistry,we examined the expression of pSmad3C and pSmad3L from 51 IPMN surgical specimens resected at our institution between 2010 and *** also examined the expression of Ki-67,c-Myc and ***:The median immunostaining index of pSmad3C was 79.2%in low-grade dysplasia,74.9%in highgrade dysplasia,and 42.0%in invasive carcinoma(P5)and a positive relationship between the expression of pSmad3L and c-Myc(P58(range,0.05–0.93),3.83(range,0.85–5.96),respectively(P=0.02).The median immunostaining index of c-Myc in the non-recurrence group and the recurrence group were 2.91(range,0–36.9)and 82.1(range,46.2–97.1),respectively(P=0.02).The median immunostaining index of Ki-67 in the non-recurrence group and the recurrence group were 12.9(range 5.7–30.8)and 90.9(range 52.9–98.5),respectively(P=0.02).Conclusions:pSmad3L was upregulated in malignant ***3L/pSmad3C ratio may be a useful prognostic factor in IPMN.

关键词： Intraductal papillary mucinous neoplasms of the pancreas Immunohistochemistry Phosphorylated Smad Carcinogenesis Prognosis

Numerical Study for Hysteresis Phenomena of Shock Wave Reflection in Overexpanded Axisymmetric Supersonic Jet

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Journal of Thermal Science 2006年第3期15卷 220-225页

作者： Tsuyoshi Yasunobu Ken Matsuoka Hideo Kashimura ShigeruMatsuo ToshiakiSetoguchi Corresponding Author Department of Control and Information Systems EngineeringKitakyushuCollege of Technology5-20-1 ShiiKokuraminamiKitakyushuJapan Kitakyushu College of Technology 5-20-1 ShiiKokuraminamiKitakyushuJapan(Student) Kitakyushu College of Technology 5-20-1 ShiiKokuraminamiKitakyushuJapan Department of Mechanical Engineering Saga University1HonjoSagaJapan

When the high-pressure gas is exhausted to the vacuum chamber from the supersonic nozzle, the overexpanded supersonic jet is formed at specific condition. In two-dimensional supersonic jet, furthermore, it is known that the hysteresis phenomena for the reflection type of shock wave in the flow field is occurred under the quasi-steady flow and for instance, the transitional pressure ratio between the regular reflection （RR） and Mach reflection （MR） is affected by this phenomenon. Many papers have described the hysteresis phenomena for underexpanded supersonic jet, but this phenomenon under the overexpanded axisymmetric jet has not been detailed in the past papers. The purpose of this study is to clear the hysteresis phenomena for the reflection type of shock wave at the overexpanded axisymmetric jet using the TVD method and to discuss the characteristic of hysteresis phenomena.

关键词： compressible flow axisymmetric flow supersonic jet regular reflection Mach reflection

Biomaterials for immunomodulation in wound healing

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Regenerative Biomaterials 2024年第5期3卷 1-22页

作者： Ying Wang Katrina Vizely Chen Yu Li Karen Shen Amid Shakeri Ramak Khosravi James Ryan Smith Eugene Alfonzo II Alteza Yimu Zhao Milica Radisic Institute of Biomedical Engineering University of TorontoTorontoON M5S 3G9Canada Toronto General Research Institute University Health NetworkTorontoON M5G 2C4 Canada Department of Chemical Engineering and Applied Chemistry University of TorontoTorontoON M5S 3E5Canada Division of Cardiovascular and Thoracic Surgery Department of SurgeryDuke University Medical CenterDurhamNC 27710USA Terrence Donnelly Centre for Cellular&Biomolecular Research University of TorontoTorontoON M5S 3E1Canada

The substantial economic impact of non-healing wounds,scarring,and burns stemming from skin injuries is evident,resulting in a financial burden on both patients and the healthcare *** review paper provides an overview of the skin’s vital role in guarding against various environmental challenges as the body’s largest protective organ and associated developments in biomaterials for wound *** first introduce the composition of skin tissue and the intricate processes of wound healing,with special attention to the crucial role of immunomodulation in both acute and chronic *** highlights how the imbalance in the immune response,particularly in chronic wounds associated with underlying health conditions such as diabetes and immunosuppression,hinders normal healing ***,this review distinguishes between traditional wound-healing strategies that create an optimal microenvironment and recent peptide-based biomaterials that modulate cellular processes and immune responses to facilitate wound ***,we highlight the importance of considering the stages of wounds in the healing *** integrating advanced materials engineering with an in-depth understanding of wound biology,this approach holds promise for reshaping the field of wound management and ultimately offering improved outcomes for patients with acute and chronic wounds.

关键词： immunomodulation peptide-based biomaterials innate immunity angiogenesis for wound healing cellular response

Self-Assembly of TBrPP-Co Molecules on an Ag/Si（111） Surface Studied by Scanning Tunneling Microscopy

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Chinese Physics Letters 2010年第2期27卷 224-227页

作者：李青 Shiro Yamazaki Toyoaki Eguchi 马旭村贾金锋薛其坤 Yukio Hasegawa Institute of Physics Chinese Academy of Science Beijing 100190 The Institute for Solid State Physics The University of Tokyo 5-1-5 Kashiwa-no-ha Kashiwa 277-8581 Japan Department of Physics Tsinghua University Beijing 100084

Self-assembly of TBrPP-Co molecules on a Si（111）-√3t×√3 Ag substrate is studied by low-temperature scanning tunneling microscopy. With the same adsorbed amount （0.07 ML）, the molecules deposited by low-temperature evaporation show three kinds of ordered structures whereas those deposited by high-temperature evaporation have size-dependent ordered structures. The distinct differences in the self-assembly structures and in the electron density of states inside the molecule near the Fermi energy demonstrate that the Br atoms of the molecule desorb at the higher evaporation temperature.

关键词： Semiconductors Surfaces interfaces and thin films Chemical physics and physical chemistry