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Changes in sleep parameters following biomimetic oral appliance therapy: A case report

World Journal of Clinical Cases 2021年第10期9卷 2312-2319页

作者： G dave Singh Shamshudin Kherani Institute of Craniofacial Sleep Medicine Vivos TherapeuticsInc.Highlands RanchCO 80129United States Dental Clinic Kherani Dental at AspenCalgary T3H0N6Canada

BACKGROUND Mandibular advancement devices(MADs)are used to treat mild to moderate obstructive sleep apnea(OSA),but there is a risk that the underlying condition can worsen in the ***,this case report is based on biomimetic oral appliance therapy as an alternative to MADs,which was found to be beneficial in the treatment of a case with severe *** SUMMARY An overnight sleep study was undertaken in a 50-year-old male with excessive daytime sleepiness that lead to a diagnosis of severe OSA as the apnea-hypopnea index(AHI)was found to be 32.8/*** the patient was unable to comply with continuous positive airway pressure therapy and declined surgical intervention,treatment with a MAD was *** 10 years later,another sleep study was performed with no MAD in the mouth,which revealed an AHI of 67.9/*** view of the deterioration in sleep quality,the patient sought alternative treatment and elected on biomimetic oral appliance therapy,using a mandibular repositioning nighttime appliance(mRNA appliance®,Vivos Therapeutics,Inc.,United States).After 10 mo,another sleep study was performed with no device in the patient’s mouth,which revealed an AHI of 11.8/h,a mean oxygen saturation of 94%and a mean oxygen desaturation index of 5.3%while *** analysis of the pre-and post-treatment study models of the upper jaw showed localized size increases of 15%-17%in the premolar regions and 15%-23%in the molar *** In adults with severe OSA that are unable to accept continuous positive airway pressure or surgical treatment,biomimetic oral appliance therapy may be preferable over MADs since biomimetic oral appliance therapy may be able to prevent worsening of sleep parameters by remodeling the nasomaxillary ***-term follow up studies are required to verify these novel findings.

关键词： Obstructive sleep apnea Biomimetic oral appliance therapy Continuous positive airway pressure Mandibular advancement device Case report

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Study on demand and characteristics of parking system in urban areas:A review

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第1期7卷 111-124页

作者： Janak Parmar Pritikana Das Sanjaykumar M.dave Department of Civil Engineering Faculty of Technology and EngineeringThe Maharaja Sayajirao University of BarodaVadodara 390001India Transportation Planning and Environment Division CSIR-Central Road Research InstituteNew Delhi 110025India

The increasing rate of private car usage in the urban areas as a result of fast-growing economy,derelict policies and subsidies are the main causes making car parking one of the main concerns for transport and traffic management all over the *** coordination between parking policies and traffic management revealed how parking is becoming a barrier to the through-traffic ***,it is responsible for the inefficient use of available resources,even the decisions are made on an ad-hoc basis while making ***,it is necessary to understand the parking choice behaviour and actual demand of parking *** the last three decades,ample studies have been done to evaluate parking characteristics,to estimate the demand for parking and on driver’s behaviour while choosing the parking *** paper integrates all these aspects and presents the state-of-the-art review of models and studies on the parking *** related to and due to the parking,various parking characteristics and their applications,parking choice behaviour of drivers,development of demand models considering various factors and review of parking policies as an integral part of the urban transport system are discussed in *** underdeveloped,authors found the literatures suggest that greater attention should be given to metrics like ease of access,walk time,parking charges,parking guidance and information system,management,etc.,at all stages of planning and policy *** together,mentioned studies demonstrate useful information concerning the entire parking *** also provides useful information to the planners and policy makers for planning,designing and evaluating parking system.

关键词： Transportation engineering Parking demand and capacity Parking characteristics Parking choice behaviour Policy guideline Planning and management

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The catalytic activity of transition metal oxide nanoparticles on thermal decomposition of ammonium perchlorate

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Defence Technology（防务技术） 2019年第4期15卷 629-635页

作者： Jalpa A. Vara Pragnesh N. dave Shalini Chaturvedi Department of Chemistry K S K V Kachchh University Mundra Road Bhuj 370 001 Gujarat India Department of Chemistry Sardar Patel University Vallabh Vidyangar 388 120 Gujarat India Samarpan Science and Commerce College Gandhinagar Gujarat India

The catalytic proficiency of three MONs for AP thermal decomposition was studied in this work.A chemical co-precipitation method was used for synthesis of MONs(CuZnO,CoZnO,and NiZnO)and their characterization carried out by utilizing XRD,FTIR,and *** TGA/DSC technique was employed for the investigation of the catalytic proficiency of MONs on the *** DSC data were used for measuring activation energy of catalyzed AP by using Ozawa,Kissinger,and Starink *** MONs were much sensitive for AP decomposition,and the performance of AP decomposition was further *** all the MONs,the CuZnO exhibits higher catalytic action than others and decomposition temperature of AP is descending around 117℃ by *** reduction in the activation energy was noticed after the incorporation of MONs in AP.

关键词： Metal oxide nanoparticles(MONs) Ammonium perchlorate(AP) Catalytic activity Activation energy

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A note on Optimal weights and variable selections for multivariate survival data

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Science China Mathematics 2009年第6期52卷 1131-1133页

作者： Zhao Sihai dave Department of Biostatistics Harvard School of Public Health and Dana-Farber Cancer Institute Boston MA 02115 USA

Fan et al. are to be congratulated for this important contribution to the analysis of multivariate failure time data. They have provided three regression parameter estimators for multiple covariates in the marginal ha... 详细信息

关键词： weights multivariate estimating variance marginal hazard likelihood asymptotically estimates choose

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Numerical simulation of sedimentation of microparticles usingthe discrete particle method

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Particuology 2008年第1期6卷 38-49页

作者： Chane-Yuan Yang Yulong Ding dave York Walter Broeckx Institute of Particle Science and Engineering University of LeedsLeeds LS2 9JTUK Procter and Gamble Newcastle Technical Centre Newcastle-upon-Tyne NE12 9TSUK

A mathematical model has been formulated based on the combined continuous and discrete particle method for investigating the sedimentation behaviour of microparticles in aqueous suspensions, by treating the fluid phase as continuous and the particles phase as discrete, thus allowing the behaviour of individual particles to be followed and the evolution of the structure of the particle phase to be investigated as a function of time. The model takes into account most of the prevailing forces acting on individual particles including van der Waals attractive, electrostatic repulsive, gravitational, Brownian, depletion, steric, contact and drag forces. A code has also been developed based on the model. This paper reports some preliminary modelling results of mono-dispersed microparticles settling in aqueous suspensions under various conditions. The results show the short time dynamics of the fluid phase, which has a similar order of magnitude to the particle phase. Such short time dynamics could bear significance to processes such as particle aggregation when their size becomes very small. Preliminary analyses of the results have also been carried out on the evolution of particle settling based on a newly proposed parameter, local normalised volume fraction （LNVF）.

关键词： Numerical modelling Combined continuous and discrete particle method Sedimentation Local normalised volume fraction lnterparticle interactions

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Flexural strength of fused filament fabricated (FFF) PLA parts on an open-source 3D printer

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Advances in Manufacturing 2018年第4期6卷 430-441页

作者： Shilpesh R. Rajpurohit Harshit K. dave Department of Mechanical Engineering SV National Institute of Technology Surat Gujarat 395007 India

Fused filament fabrication (FFF) has been widely used to develop prototypes as well as functional parts owing to its capability for creating parts with complex geometries in a short time without the specific requirement of tooling. The mechanical properties of parts produced by FFF exhibit 70%-80% of the mechanical properties of parts produced by injection molding. The mechanical properties of FFF-produced parts are primarily dependent on the selection of various process variables. The mechanical properties of the part can be enhanced through the proper selection of process variables. In the present experimental investigation, the effects of the process variables, viz. raster angle, layer height, and raster width on the flexural properties of FFF-printed polylactic acid (PLA) is studied. The result shows that flexural strength is primarily influenced by layer height followed by raster angle. The sample printed with 100-μm layer height and 0° raster angle exhibits a higher tensile strength. Further, the microscopic examination of the deformed specimen is performed to understand the mode of failure. Specimens printed at different raster angles show different modes of failure.

关键词： Fused filament fabrication (FFF) Polylactic acid (PLA) Raster angle Layer height Raster width Flexural strength

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Relationship between rock macro-and micro-properties and wellbore breakout type

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Underground Space 2021年第1期6卷 62-75页

作者： Hossein Rahmati Alireza Nouri dave Chan Hans Vaziri University of Alberta AlbertaCanada BP America Inc. HoustonUSA

This study numerically investigates the effect of material micro-and macro-parameters on the failure mechanisms and geometry of a wellbore *** analysis of the borehole breakout is essential in addressing wellbore stability,well completion,and sand production *** three-dimensional discrete element method(DEM)was used in the *** numerical tool was used in numerical model simulations of drilling through sandstone in cubic samples at the laboratory scale subjected to pre-existing far-field ***,a series of triaxial testing simulations were performed to relate the micromechanical parameters to the macromechanical material *** results showed that the geometry of the breakout is affected,among the material micro-parameters,by the particle contact modulus,bond normal and shear strengths,particle crushing strength,and particle size ***,it was found that the macro-parameters including Young’s modulus,friction and dilation angles,and uniaxial compression strength(UCS)also affect the type of breakout.

关键词： Borehole breakout Numerical simulation Material properties

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Evaluation of numerical schemes for capturing shock waves in modeling proppant transport in fractures

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Petroleum Science 2017年第4期14卷 731-745页

作者： Morteza Roostaei Alireza Nouri Vahidoddin Fattahpour dave Chan Department of Civil and Environmental Engineering University of AlbertaEdmontonCanada

In petroleum engineering, the transport phenomenon of proppants in a fracture caused by hydraulic fracturing is captured by hyperbolic partial differential equations(PDEs). The solution of this kind of PDEs may encounter smooth transitions, or there can be large gradients of the field variables. The numerical challenge posed in a shock situation is that high-order finite difference schemes lead to significant oscillations in the vicinity of shocks despite that such schemes result in higher accuracy in smooth regions. On the other hand, first-order methods provide monotonic solution convergences near the shocks,while giving poorer accuracy in the smooth *** numerical simulation of such systems is a challenging task using conventional numerical methods. In this paper, we investigate several shock-capturing *** competency of each scheme was tested against onedimensional benchmark problems as well as published numerical experiments. The numerical results have shown good performance of high-resolution finite volume methods in capturing shocks by resolving discontinuities while maintaining accuracy in the smooth regions. Thesemethods along with Godunov splitting are applied to model proppant transport in fractures. It is concluded that the proposed scheme produces non-oscillatory and accurate results in obtaining a solution for proppant transport problems.

关键词： Proppant transport Hyperbolic partial differential equations Frac pack Hydraulic fracturing

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A review of selective laser melting of aluminum alloys: Processing,microstructure, property and developing trends

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Journal of Materials Science & Technology 2019年第2期35卷 270-284页

作者： Jinliang Zhang Bo Song Qingsong Wei dave Bourell Yusheng Shi State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology dave Bourell Laboratory for Freeform Fabrication Mechanical Engineering Department The University of Texas at Austin

Selective laser melting(SLM) is an attractive rapid prototyping technology for the fabrication of metallic components with complex structure and high performance. Aluminum alloy, one of the most pervasive structural materials, is well known for high specific strength and good corrosion resistance. But the poor laser formability of aluminum alloy restricts its application. There are problems such as limited processable materials, immature process conditions and metallurgical defects on SLM processing aluminum alloys. Some efforts have been made to solve the above problems. This paper discusses the current research status both related to the scientific understanding and technology applications. The paper begins with a brief introduction of basic concepts of aluminum alloys and technology characterization of laser selective melting. In addition, solidification theory of SLM process and formation mechanism of metallurgical defects are discussed. Then, the current research status of microstructure, properties and heat treatment of SLM processing aluminum alloys is systematically reviewed respectively. Lastly, a future outlook is given at the end of this review paper.

关键词： Selective laser melting Aluminum alloy Metallurgical defects Mechanical properties Heat treatment Developing trend

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Characterization of particle deposition during crossflow filtration as influenced by permeate flux and crossflow velocity using a microfluidic filtration system

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Frontiers of Chemical Science and Engineering 2021年第3期15卷 552-561页

作者： Hongzhan Di Gregory J.O.Martin dave E.Dunstan Department of Chemical and Biomolecular Engineering University of MelbourneParkvilleVictoria 3010Australia

Particle deposition during crossflow filtration is significantly influenced by the operating conditions,in particular the permeate flux and crossflow ***,there is a lack of detailed knowledge about how deposit layer structures and distributions depend on operating *** study uses a microfluidic visualisation filtration system to examine the influence of operating conditions on the deposition process during crossflow ultrafiltration from a microscopic *** the permeate flux caused an increasing amount of deposition and a thicker deposit *** crossflow velocities reduced the extent of *** degree of deposition varied over a range of operating conditions due to the altered hydrodynamic forces exerted on the particles,which can be examined by the deposition probability according to an existing *** on this,an empirical correlation between the deposition probability and volume of deposition as a function of filtration time was developed,which gave good agreement with experimental *** effect of solution conditions was also involved in this correlation as a interaction *** could be useful for predicting the dynamic deposition process during crossflow filtration over a range of operating and solution conditions.

关键词： particle deposition crossflow filtration microfluidics confocal microscopy

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