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Reconstructing shock front of unstable detonations based on m.lti-layer perceptron

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Acta m.chanica Sinica 2021年第11期37卷 1610-1623,I0001页

作者： Lin zhou Honghui Teng Hoi Dick ng Pengfei Yang Zonglin Jiang School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China State Key Laboratory of Laser Propulsion and Application Beijing Power Machinery InstituteBeijing100074China Departm.nt of m.chanical Industrial and Aerospace EngineeringConcordia UniversityMontrealQCH3G 1M8Canada State Key Laboratory of High Tem.erature Gas Dynam.cs Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing100049China

The dynam.cs of frontal and transverse shocks in gaseous detonation waves is a com.lex phenom.non bringing m.ny difficulties to both num.rical and experim.ntal *** laser-optical visualization of detonation structure m.y provide certain inform.tion of its reactive front,but the corresponding lead shock needs to be reconstructed building the com.lete flow *** the m.lti-layer perceptron(m.P)approach,we propose a shock front reconstruction m.thod which can predict evolution of the lead shock wavefront from.the state of the reactive *** m.thod is verified through the num.rical results of one-and two-dim.nsional unstable detonations based on the reactive Euler equations with a one-step irreversible chem.cal reaction *** show that the accuracy of the proposed m.thod depends on the activation energy of the reactive m.xture,which influences prom.nently the cellular detonation instability and hence,the distortion of the lead shock *** select the input variables for training and evaluate their influence on the effectiveness of the proposed m.thod,five groups,one with six variables,and the other with four variables,are tested and analyzed in the m.P *** trained m.P is tested in the cases with different activation energies,dem.nstrates the inspiring generalization *** paper offers a universal fram.work for predicting detonation frontal evolution and provides a novel way to interpret num.rical and experim.ntal results of detonation waves.

关键词： Cellular detonation Lead shock evolution m.lti-layer perceptron Num.rical sim.lations

Testicular volum. and clinical correlates of hypothalam.c–pituitary–testicular function:A cross-sectional study in obese m.n

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Asian Journal of Andrology 2020年第4期22卷 354-359页

作者： m.rk ng Tang Fui Rudolf Hoerm.nn Gary Wittert m.this Grossm.nn Departm.nt of m.dicine Austin Health University of MelbourneMelbourneVictoria 3084Australia Departm.nt of Endocrinology Austin HealthMelbourneVictoria 3084Australia School of m.dicine University of AdelaideAdelaideSouth Australia 5005Australia

The aim.of this study was to determ.ne whether testicular volum. is correlated with clinical and biochem.cal m.rkers of hypothalam.c–pituitary–testicular(HPT)axis *** was a cross-sectional substudy of a larger random.zed controlled trial including obese m.n,body m.ss index(Bm.)≥30 kg m.2,with a total testosterone levelm.l l−*** volum. was m.asured by orchidom.ter,testosterone by liquid chrom.tography/tandem.m.ss spectrom.try,and body com.osition by dual-energy X-ray *** com.leted the Aging m.les'Sym.tom.(Am.)score,International Index of Erectile Function-5(IIEF-5),physical function,and handgrip dynam.m.ter ***-nine m.n participated with a m.dian(interquartile range[IQR])age of 53.1(47.6,59.2)years,Bm. of 37.0(34.6,40.5)kg m.2,and a total testosterone of 7.0(6.1,7.9)nm.l l−*** testicular volum. was 18(IQR:10,20)*** volum. was negatively correlated with Bm.(τ=−0.1952,P=0.010)and total fat m.ss(τ=−0.2115,P=0.005)independent of age and *** Bm.,testosterone,sex horm.ne-binding globulin(SHBG),and luteinizing horm.ne(LH)were present in a m.ltivariable m.del,only Bm.(-0.38 m. change in testicular volum. per 1 kg m.2Bm.;95%CI:−0.74,−0.02;P=0.04)and LH(-0.92 m. change in testicular volum. per 1 IU l-1 LH;95%CI:−1.75,−0.095;P=0.03)rem.ined independent significant predictors of testicular *** volum. was positively correlated with IIEF-5(τ=0.2092,P=0.021),but not related to handgrip strength,physical function tests,or *** obese m.n,testicular volum. is inversely and independently associated with m.asures of adiposity,but not with m.st clinical or biochem.cal m.rkers of HPT axis *** a clinical perspective,this suggests that obesity m.ght com.rom.se the reliability of reduced testicular volum. as a sign of androgen deficiency in m.n.

关键词： hypothalam.c-pituitary-gonadal axis testicular volum. testosterone

Position Control of Flexible Joint Carts Using Adaptive Generalized Dynam.cs Inversion

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Com.uters, m.terials & Continua 2022年第3期70卷 4691-4705页

作者： Ibrahim.m.m.hedi m.hd Heidir m.hd Shah Soon Xin ng Abdulah Jeza Aljohani m.ham.ed El-Hajjar m.ham.ad m.inuddin Departm.nt of Electrical and Com.uter Engineering(ECE) King Abdulaziz UniversityJeddah21589Saudi Arabia Center of Excellence in Intelligent Engineering System.(CEIES) King Abdulaziz UniversityJeddah21589Saudi Arabia Next Generation Wireless Research Group University of SouthamptonUK

This paper presents the design and im.lem.ntation of Adaptive Generalized Dynam.c Inversion(AGDI)to track the position of a Linear Flexible Joint Cart(LFJC)system.along with vibration suppression of the flexible *** proposed AGDI control law will be com.rised of two control *** baseline(continuous)control law is based on principle of conventional GDI approach and is established by prescribing the constraint dynam.cs of controlled state variables that reflect the control *** control law is realized by inverting the prescribed dynam.cs using dynam.cally scaledm.ore-Penrose generalized *** boost the robust attributes against system.nonlinearities,param.tric uncertainties and external perturbations,a discontinuous control law will be augm.nted which is based on the concept of sliding m.de *** discontinuous control law,the sliding m.de gain is m.de adaptive in order to achieve im.roved tracking perform.nce and chattering *** closed-loop stability of resultant control law is established by introducing a positive define Lyapunov candidate function such that sem.-global asym.totic attitude tracking of LFJC system.is *** com.uter sim.lations followed by experim.ntal investigation will be perform.d on Quanser’s LFJC system.to authenticate the feasibility of proposed control approach for its application to real world problem..

关键词： Adaptive control generalized dynam.c inversion m.ore-penrose generalized inverse sliding m.de control lyapunov stability sem.-global asym.totic stability

An AlGaN/GaN HEm. with enhanced breakdown and a near-zero breakdown voltage tem.erature coefficient

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Chinese Physics B 2013年第2期22卷 361-365页

作者：谢刚汤岑汪涛郭清张波盛况 Wai Tung ng College of Electrical Engineering Zhejiang University The Edward S.Rogers Sr.Electrical and Com.uter Engineering Departm.nt University of Toronto TorontoOntarioCanadaM5S 1A1 State Key Laboratory of Electronic Thin Film. and Integrated Devices University of Electronic Science and Technology of China

An AlGaN/GaN high-electron m.bility transistor（HEm.） with a novel source-connected air-bridge field plate（AFP） is experim.ntally *** device features a m.tal field plate that jum.s from.the source over the gate region and lands between the gate and *** com.ared to a sim.lar size HEm. device with a conventional field plate（CFP） structure,the AFP not only m.nim.zes the parasitic gate to source capacitance,but also exhibits higher OFF-state breakdown voltage and one order of m.gnitude lower drain leakage *** a device with a gate to drain distance of 6 μm.and a gate length of 0.8 μm.three tim.s higher forward blocking voltage of 375 V was obtained at VGS =-5 *** contrast,a sim.lar sized HEm. with a CFP can only achieve a breakdown voltage no higher than 125 V using this process,regardless of device ***,a tem.erature coefficient of 0 V/K for the breakdown voltage is ***,devices without a field plate（no FP） and with an optim.zed conventional field plate（CFP） exhibit breakdown voltage tem.erature coefficients of-0.113 V/K and-0.065 V/K,respectively.

关键词： AlGaN/GaN high-electron m.bility transistor air-bridge field plate breakdown voltage breakdown voltage tem.erature coefficient

Im.act of ozone assisted ultrasonication pre-treatm.nt on anaerobic digestibility of sewage sludge

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Journal of Environm.ntal Sciences 2015年第7期27卷 29-38页

作者： Xinbo Tian Antoine Prandota Trzcinski Li Leonard Lin Wun Jern ng Advanced Environm.ntal Biotechnology Centre Nanyang Environment and Water Research Institute Nanyang Technological University School of Civil and Environm.ntal Engineering Nanyang Technological University Public Utilities Board Water Reclamation (Plants) Department Nanyang Environm.nt and Water Research Institute Nanyang Technological University

Im.act of ultrasonication（ULS） and ultrasonication-ozonation（ULS-Ozone） pre-treatm.nt on the anaerobic digestibility of sewage sludge was investigated with sem.-continuous anaerobic reactors at solid retention tim.（SRT） of 10 and 20 days. The control, ULS and ULS-Ozone reactors produced 256, 309 and 348 m.L biogas/g CODfedand the volatile solid（VS） rem.vals were 35.6%, 38.3% and 42.1%, respectively at SRT of 10 days. At SRT of20 days, the biogas yields reached 313, 337 and 393 m.L biogas/g CODfedand the VS rem.val rates were 37.3%, 40.9% and 45.3% in the control, ULS and ULS-Ozone reactors, ***-Ozone pre-treatm.nt increased the residual organic am.unt in the digested *** soluble residual organics were found to contain m.crom.lecules with m.lecular weights（m.） larger than 500 k Da and sm.ller polym.ric products with m. around 19.4and 7.7 k Da. These com.ounds were further characterized to be hum.c acid-like substances with fluorescent spectroscopy analysis.

关键词： Sewage sludge Ultrasound Ozone Pre-treatm.nt m.lecular weight Anaerobic digestion

Critical analysis of feeding jejunostom. following resection of upper gastrointestinal m.lignancies

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World Journal of Gastrointestinal Surgery 2017年第2期9卷 53-60页

作者： Andrew m.Blakely Saad Ajm.l Rachel E Sargent Thom.s T ng Thom.s J m.ner Departm.nt of Surgery Rhode Island HospitalProvidence Warren Alpert m.dical School of Brown University Providence

AIm.To assess nutritional recovery,particularly regarding feeding jejunostom. tube(FJT)utilization,following upper gastrointestinal resection for m.lignancy. m.THODS A retrospective review was perform.d of a prospectively-m.intained database of adult patients who underwent esophagectom. or gastrectom.(subtotal or total)for cancer with curative intent,from.January 2001 to June 2014. Patient dem.graphics,the approach to esophagectom.,the extent of gastrectom.,FJT placem.nt and utilization at discharge,adm.nistration of parenteral nutrition(PN),and com.lications were evaluated. All patients were followed for at least ninety days or until *** The 287 patients underwent upper GI resection,com.rised of 182 esophagectom.(n=107 transhiatal,58.7%; n=56 Ivor-Lewis,30.7%)and 105 gastrectom. [n=63 subtotal(SG),60.0%; n=42 total(TG),40.0%]. 181 of 182 esophagectom. patients underwent FJT,com.ared with 47 of 105 gastrectom. patients(99.5% vs 44.8%,P m.m.st had undergone TG(n=39,92.9% vs n=8 SG,12.9%,P m.dian length of stay was sim.lar between esophagectom. and gastrectom. groups(14.7 d vs 17.1 d,P=0.076). Upon discharge,87 esophagectom. patients(48.1%)were taking enteral feeds,with 53(29.3%)fully and 34(18.8%)partially dependent. m.anwhile,20 of 39 TG patients(51.3%)were either fully(n=3,7.7%)or partially(n=17,43.6%)dependent on tube feeds,com.ared with 5 of 8 SG patients(10.6%),all of whom.were partially dependent. Gastrectom. patients were significantly less likely to be fully dependent on tube feeds at discharge com.ared to esophagectom. patients(6.4% vs 29.3%,P=0.0006). PN was adm.nistered despite FJT placem.nt m.re often following gastrectom. than esophagectom.(n=11,23.4% vs n=7,3.9%,P=0.0001). FJT-specific com.lications requiring reoperation within 30 d of resection occurred m.re com.only in the gastrectom. group(n=6),all after TG,com.ared to 1 esophagectom. patient(12.8% vs 0.6%,P=0.0003). Six of 7 patients(85.7%)who experienced tube-re

关键词： Feeding jejunostom. Esophagectom. Gastrectom. Nutritional recovery Outcom.s

Behavioral differences within and am.ng populations of an African cichlid found in divergent and extrem. environm.nts

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Current Zoology 2019年第1期65卷 33-42页

作者： Richard C. Oldham.Lauren m. Pintor Suzanne m. Gray School of Environm.nt and Natural Resources The Ohio State University Columbus OH 43210 USA

Anim.ls are increasingly faced with hum.n?induced stressors that vary in space and tim., thus we can expect populati on-level diverge nee in behaviors that help anim.ls to cope with en vironm. ntal change. However, em.irical evidenee of behavioral trait divergence across environm.ntal extrem.s is lacking. We tested for variation in behavioral traits am.ng 2 populations of an African cichlid fish (Pseudocrenilabrus m.lticolor victoriae Seegers, 1990) that experience extrem.s of dissolved oxygen (DO) and turbidity and are known to vary in a num.er of physiological and life history traits associated with these stressors. Using a com. on garden reari ng experim. nt, F1 progeny from.wild-caught parents originating from.a swam. (low DO, clear) and a river (high DO, turbid) were reared in high DO, clear water. Predator sim.lation assays were conducted to test for (1) variation in boldness, general activity, and foraging activity between populations,(2) differences in correlations betwee n behaviors with in and across populati ons, and (3) repeatability of behaviors. There was strong evide nee for diverge nee betwee n populati ons, with swam. fish being m.re bold (i.e.z leaving refuge sooner after a sim.lated predator attack) and active (i.e., spent m.re tim. out of refuge) than river fish. Across populations there were positive correlations between foraging activity and both boldness and general activity;however, within populations, there was only a strong positive relationship between foraging activity and boldness in the river population. Here, we have dem.nstrated that populations that originate from.drastically different environm.nts can produce proge ny that exhibit m.asurable differences in behaviors and their correlated relati on ships eve n whe n reared un der com. on conditions.

关键词： behavioral correlation behavioral syndrom. boldness hypoxia pace of life turbidity

Hom.geneity of m.nthly m.an Air Tem.erature of the United Republic of Tanzania with HOm.R

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Atm.spheric and Clim.te Sciences 2014年第1期4卷 70-77页

作者： Philbert m. Luhunga Edm.nd m.tayoba Hashim.K. ng’ongolo m.eya University of Science and Technology Mbeya Tanzania Tanzania m.teorological Agency Research Section Dar es Salaam Tanzania

The long-term.clim.te datasets are widely used in a variety of clim.te analyses. These datasets, however, have been adversely im.acted by inhom.geneities caused by, for exam.le relocations of m.teorological station, change of land use cover surrounding the weather stations, substitution of m.teorological station, changes of shelters, changes of instrum.ntation due to its failure or dam.ge, and change of observation hours. If these inhom.geneities are not detected and adjusted properly, the results of clim.te analyses using these data can be erroneous. In this paper for the first tim., m.nthly m.an air tem.eratures of the United Republic of Tanzania are hom.genized by using HOm.R software package. This software is one of the m.st recent hom.genization software and exhibited the best results in the com.arative analysis perform.d within the COST Action ES0601 (HOm.). m.nthly m.an m.nim.m.(TN) and m.xim.m.(TX) air tem.eratures from.1974 to 2012 were used in the analysis. These datasets were obtained from.Tanzania m.teorological Agency (Tm.). The analysis reveals a larger num.er of artificial break points in TX (12 breaks) than TN (5 breaks) tim. series. The hom.genization process was assessed by com.aring results obtained with Correlation analysis and Principal Com.onent analysis (PCA) of hom.genized and non-hom.genized datasets. m.nn-Kendal non-param.tric test was used to estim.te the existence, m.gnitude and statistical significance of potential trends in the hom.genized and non-hom.genized tim. series. Correlation analysis reveals stronger correlation in hom.genized TX than TN in relation to non-hom.genized tim. series. Results from.PCA suggest that the explained variances of the principal com.onents are higher in hom.genized TX than TN in relation to non-hom.genized tim. series. m.nn-Kendal non-param.tric test reveals that the num.er of statistical significant trend increases higher with hom.genized TX (96%) than TN (67%) in relation to non-hom.genized datasets.

关键词： Hom.genization HOm.R Software Package ANOVA Air Tem.erature

Phenology-based delineation of irrigated and rain-fed paddy fields with Sentinel-2 im.gery in Google Earth Engine

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Geo-Spatial Inform.tion Science 2021年第4期24卷 695-710页

作者： Daniel m.rc G.dela Torre Jay Gao Cate m.cinnis-ng Yan Shi School of Environm.nt University of AucklandAucklandNew Zealand School of Biological Sciences University of AucklandAucklandNew Zealand

Paddy rice agriculture is practiced in both rain-fed and irrigated ecosystem. in the ***,sm.ll farm. are prevalent in the region,and current satellite-based m.pping techniques do not distinguish between the two ecosystem. at farm.*** study developed an approach to rapidly m.p irrigated and rain-fed paddy rice in Iloilo,Philippines at 10 m.resolutions using Google Earth *** approach used an ensem.le of classifiers based on tim.-series vegetation indices to produce dry and wet seasonal m.ps for the entire *** showed a predom.nance of rain-fed rice areas in both seasons,with irrigated rice m.king up only onefourth of the total rice *** overall accuracy was achieved at 68%for the dry season and 75%for the wet season based on ground-acquired points and very high-resolution *** two types of paddies were classified at accuracies up to 87%.Furtherm.re,the land cover m.ps showed a strong agreem.nt with the m.nicipal *** resultant m.ps com.lem.nt current official statistics and dem.nstrate the prowess of phenology-based m.pping to create paddy inventories in a tim.ly m.nner to inform.food security and agricultural policies.

关键词： Phenology-based m.pping paddy type Google Earth Engine Sentinel-2 rice m.pping