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556篇 您的检索式:作者名="Venne"
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1儿童期肥胖、成年期肥胖和心血管风险因子显示文摘过去30年,儿童超重或肥胖的发生率明显增加[1]。儿童期肥胖是死亡率增加的预测因子,这主要是由于儿童期肥胖可导致心血管疾病发生率增加。相关的预测研究提示"肥胖流行症"可能改变目前心血管疾病死亡率下降的趋势,使现今儿童的寿命缩短。Juonala M Magnussen CG Berenson GS Venn A Burns TL Sabin MA Srinivasan SR Daniels SR Davis PH Chen W Sun C Cheung M Viikari JS Dwyer T Raitakari OT 叶鹏 2012中华高血压杂志2012,20,1:6
2Large-scale destress blasting for seismicity control in hard rock mines:A case study显示文摘Destress blasting is a rockburst control technique where highly stressed rock is blasted to reduce the local stress and stiffness of the rock,thereby reducing its burst proneness.The technique is commonly practiced in deep hard rock mines in burst prone developments,as well as in sill or crown pillars which become burst-prone as the orebody is extracted.Large-scale destressing is a variant of destress blasting where panels are created parallel to the orebody strike with a longhole,fanning blast pattern from cross cut drifts situated in the host rock.The aim of panel destressing is to reduce the stress concentration in the ore blocks or pillars to be mined.This paper focuses on the large-scale destress blasting program conducted at Vale's Copper Cliff Mine(CCM)in Ontario,Canada.The merits of panel destressing are examined through field measurements of mining induced stress changes in the pillar.The destressing mechanism is simulated with a rock fragmentation factor(a)and stress reduction/dissipation factor(b).A 3D model is built and validated with measured induced stress changes.It is shown that the best correlation between the numerical model and field measurements is obtained when the combination of a and b indicates that the blast causes high fragmentation(a=0.05)and high stress release(b=0.95)in the destress panel.It is demonstrated that the burst proneness of the ore blocks in the panel stress shadow is reduced in terms of the brittle shear ratio(BSR)and the burst potential index(BPI).Isaac Vennes Hani Mitri Damodara Reddy Chinnasane Mike Yao 2020International Journal of Mining Science and Technology2020,30,2:5
3Autoregressive neural networks with exogenous variables for indoor temperature prediction in buildings显示文摘Thermal models of buildings are helpful to forecast their energy use and to enhance the control of their mechanical systems.However,these models are building-specific and require a tedious,error-prone and time-consuming development effort relying on skilled building energy modelers.Compared to white-box and gray-box models,data-driven(black-box)models require less development time and a minimal amount of information about the building characteristics.In this paper,autoregressive neural network models are compared to gray-box and black-box linear models to simulate indoor temperatures.These models are trained,validated and compared to actual experimental data obtained for an existing commercial building in Montreal(QC,Canada)equipped with roof top units for air conditioning.Results show that neural networks mimic more accurately the thermal behavior of the building when limited information is available,compared to gray-box and black-box linear models.The gray-box model does not perform adequately due to its under-parameterized nature,while the linear models cannot capture non-linear phenomena such as radiative heat transfer and occupancy.Therefore,the neural network models outperform the alternative models in the presented application,reaching a coefficient of determination R2 up to 0.824 and a root mean square error down to 1.11℃,including the error propagation over time for a 1-week period with a 5-minute time-step.When considering a 50-hour time horizon,the best neural networks reach a much lower root mean square error of around 0.6℃,which is suitable for applications such as model predictive control.Benoit Delcroix Jérôme Le Ny Michel Bernier Muhammad Azam Bingrui Qu Jean-Simon Venne 2021Building Simulation2021,14,1:3
4Geomechanical effects of stress shadow created by large-scale destress blasting显示文摘This study aims to determine if large-scale choked panel destress blasting can provide sufficient beneficial stress reduction in highly-stressed remnant ore pillar that is planned for production. The orebody is divided into 20 stopes over 2 levels, and 2 panels are choke-blasted in the hanging wall to shield the ore pillar by creating a stress shadow around it. A linear-elastic model of the mining system is constructed with finite difference code FLAC3 D. The effect of destress blasting in the panels is simulated by applying a fragmentation factor(α) to the rock mass stiffness and a stress reduction factor(β) to the current state of stress in the region occupied by the destress panels. As an extreme case, the destress panel is also modeled as a void to obtain the maximum possible beneficial effects of destressing and stress shadow.Four stopes are mined in the stress shadow of the panels in 6 lifts and then backfilled. The effect of destress blasting on the remnant ore pillar is quantified based on stress change and brittle shear ratio(BSR) in the stress shadow zone compared to the base case without destress blasting. To establish realistic rock fragmentation and stress reduction factors, model results are compared to measured stress changes reported for case studies at Fraser and Brunswick mines. A 1.5 MPa immediate stress decrease was observed 20 m away from the panel at Fraser Mine, and a 4 MPa immediate stress decrease was observed 25 m away at Brunswick Mine. Comparable results are obtained from the current model with a rock fragmentation factor α of 0.2 and a stress reduction factor α of 0.8. It is shown that a destress blasting with these parameters reduces the major principal stress in the nearest stopes by 10-25 MPa.This yields an immediate reduction of BSR, which is deemed sufficient to reduce volume of ore at risk in the pillar.Isaac Vennes Hani Mitri 2017Journal of Rock Mechanics and Geotechnical Engineering2017,9,6:2
5通过对回转窑轴线的光电检测提高窑设备的运转率显示文摘Venne,J 张云 1992国外建材科技1992,,2:2
6Endoscopic sphincterotomy complicatrions and their management: an attempt at consensus显示文摘Cotton PB Lehman G Vennes J 1991Gastrointest Endosc1991,37,3:1
7Continuous passive motion with accelerated flexion after total knee arthroplasty 显示文摘Yashar AA Venn Watson E Welsh T 1997Clin Orthop1997,12,:1
8Respiratory effects of dexmedetomidine in the surgical patient requiring intensive care显示文摘Venn RM Hell J Grounds RM 0,,05:1
9Effects of dexmedetomidine- on adrenoeortical function, and the cardiovascular, endocrine andin- flammatory responses in post-operative patients needing sedationin he intensive care unit显示文摘Venn RM Bryant A Hall GM 2001Br J Anaesth2001,86,5:1
10Endoscopic sphincterotomy complications and their management: an attempt at consensus显示文摘COTTON P B LEHMAN G VENNES J 1991Gastrointest Endosc1991,37,3:1
11Pharmacokinetics of dexmedetomidine infusions for sedation of postoperative patients requiring intensive caret显示文摘Venn RM Hell J Grounds RM 2002Br J Anaesth2002,88,5:1
12Endoscopic sphincterotomy complications and their management:an attempt at consensus显示文摘Cotton P B Lehman G Vennes J 1991Gastrointest Endosc1991,37,3:1
13A phase II study to evaluate the efficacy of dexmedetomidine for sedation in the medieal intensive care unit显示文摘Venn M Newman J Grounds M 2003Intensive Care Med2003,29,:1
14Endoscopic sphinc- terotomy complications and their management: an attempt at consensus显示文摘Cotton PB Lehman G Vennes J 1991Gastrointest Endose1991,37,3:1
15Baselines representing blood glucose clearance improve in vitro prediction of the glycaemic impact of customarily consumed food quantities显示文摘Monro JA Mishra S Venn B 2010British Journal of Nutrition2010,103,:1
16Respiratory effects of dexmedetomi- dine in the surgical requiring intensive care 显示文摘Venn RM Hell J Grounds RM 2000Crit Care2000,4,5:1
17Endoscopic sphincterotomy complications and their management:an attempt at consensus 显示文摘Cotton PB Lehman G Vennes J 1991Gastrointest Endow1991,37,3:1
18Comparison between dexmedeto- midine and propofol for sedation in the intensive care units patient and clinician perceptions显示文摘Venn RM Grounds RM 2001Br J Anaesth2001,87,5:1
19Perinatal and obstetric out- comes of donor insemination using cryopreserved semen in Vic- toria, Australia 显示文摘Hoy J Venn A Halliday J 1999Hum Reprod1999,14,7:1
20Characterisics of ovarian and uterine cancers in a cohort of in vitro fertilization patients显示文摘VENN A JONES P QUINN M 2001Gynecol Oncol2001,82,1:1
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