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Fluidization and bubbling behavior of potash particles in a deep fluidized bed

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Particuology 2023年第9期80卷 103-114页

作者： Mojtaba Nabipoor Hassankiadeh Jingsi Yang Mark Berrey dave Jordison Lifeng Zhang Donald Bergstrom Raymond J.Spiteri Department of Chemical and Biological Engineering University of SaskatchewanSKS7N 5A9SaskatoonCanada The Mosaic Company Belle PlaineSKCanada Department of Mechanical Engineering University of SaskatchewanSaskatoonCanada Department of Computer Science University of SaskatchewanSaskatoonSKCanada

Most existing models for predicting bubble size and bubble frequency have been developed for freely bubbling fluidized *** prediction of bubbling behavior in deep fluidized beds,however,has been a challenge due to the higher degree of bubble coalescence and break up,high probability of the slugging regime,partial fluidization,and chaotic behavior in the bubbling *** this work,the bubbling and fluidization behavior of potash particles was investigated in a deep fluidized bed employing a twin-plane electrical capacitance tomography(ECT)*** volume fraction,average bubble velocity,average bubble diameter,and bubble frequency in both bubbling and slugging regimes were measured at two different bed height ratios(H/D=3.5 and H/D=3.78).This work is the first to illustrate a sequential view of bubbles at different superficial gas velocities in a fluidized *** results show that both the bubble diameter and rising velocity increased with increasing the superficial gas velocity for the two bed heights,with larger values observed in the deeper bed compared to the shallower *** values for bubble diameter,bubble rise velocity and bubble frequency from different models are compared with the experimental data obtained from the ECT system in this *** agreement has been achieved between the values predicted by the previous models and the experimental data for the bubble diameter and bubble rise velocity with an average absolute deviation of 16%and 15%for the bed height of 49 cm and 13%and 8%for the bed height of 53 cm,respectively.

关键词： Deep fluidized bed Potash particle Electrical capacitance tomography Image reconstruction Bubbling and slugging regime

The Use of 'In Process' Monitoring Equipment in Heat Treatment Today

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材料热处理学报 2004年第5期25卷 591-596页

作者： dave Plester Datapaq limited Cambridge CB4 OGU UK

This paper looks at how in-process temperature monitoring systems are being increasingly used in heat treatment applications such as surface hardening, annealing, normalizing, tempering etc. We look at the basic equipment required to successfully monitor from within a furnace and how developments such as RF transmission have enhanced the effectiveness of profiling trials to the point where on line adjustments to furnace conditions can be seen and analyzed in real time. We examine how continuous processes can benefit from this type of monitoring and also how routine operations such as furnace surveying in batch furnaces can benefit greatly from in-process monitoring. Advances in software are also considered, showing how packages are now designed to speed up the processing of data in day to day heat treatment operations.

关键词：热处理温度监测器射频传输剖面测量

Early Cardiac Catheterizations within 30 Days Post Congenital Heart Surgery in Children

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Congenital Heart Disease 2023年第1期18卷 79-95页

作者： Daniel Quandt Alessia Callegari Oliver Niesse Martin Christmann Anke Meinhold Hitendu dave Walter Knirsch Oliver Kretschmar Pediatric Heart Centre-Division of Pediatric Cardiology University Children’s Hospital ZurichZurichSwitzerland Department Neonatology and Pediatric Intensive Care University Children’s Hospital ZurichZurichSwitzerland Department of Congenital Cardiothoracic Surgery University Children’s Hospital ZurichZurichSwitzerland Children’s Research Centre ZurichSwitzerlandUniversity Children’s Hospital ZurichZurichSwitzerland University of Zurich ZurichSwitzerland

Background:This study set out to assess the indications,feasibility,safety,and outcome of early cardiac catheterizations(CC)within 30 days after congenital heart surgery(CHS)in *** and Results:This is a retrospective,single-center case review study of all CC within 30 days after CHS between 1/2010-12/2020.A total of 317(138 diagnostic,179 interventional)CC were performed in 245 patients at a median of 4 days(IQR 13)after *** median age was 3 months(IQR 6),and body weight was 5 kg(IQR 4).A total of 194(61.2%)CC were performed in patients with univentricular *** revealed significant pathologies leading to early redo-surgery in 37 patients(12%).The transcatheter interventions primarily were needed in patients after cavo-pulmonary connection(n=69%,21.8%),right ventricle to pulmonary artery conduit(n=39%,12.3%),and Norwood-I surgery(n=34%,10.7%)presenting with hypoxemia,prolonged postoperative course,and suspected arterial stenosis on *** clinical impact of an early postoperative transcatheter intervention for the following clinical course was high in most *** were nine(2.8%)major and 20(6.3%)minor intra-procedural *** factor analysis revealed no difference for the occurrence of complications for patients’age,weight,and time from initial CHS,underlying *** heart disease,or ***:Early CC within 30 days after CHS in children can be performed safely with a high diagnostic and therapeutic *** rate of complications is low,while the therapeutic consequence is relevant.

关键词： Early postoperative cardiac catheterization congenital heart surgery children

A systematic review of machine learning techniques for cattle identification:Datasets,methods and future directions

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Artificial Intelligence in Agriculture 2022年第1期6卷 138-155页

作者： Md Ekramul Hossain Muhammad Ashad Kabir Lihong Zheng dave L.Swain Shawn McGrath Jonathan Medway School of Computing Mathematics and EngineeringCharles Sturt UniversityBathurstNSW 2795Australia Gulbali Institute for Agriculture Water and EnvironmentCharles Sturt UniversityWagga WaggaNSW 2678Australia TerraCipher Pty.Ltd. Alton DownsQLD 4702Australia Fred Morley Centre School of Animal and Veterinary SciencesCharles Sturt UniversityWagga WaggaNSW 2678Australia Food Agility CRC Ltd SydneyNSW 2000Australia

Increased biosecurity and food safety requirements may increase demand for efficient traceability and identification systems of livestock in the supply *** advanced technologies of machine learning and computer vision have been applied in precision livestock management,including critical disease detection,vaccination,production management,tracking,and health *** paper offers a systematic literature review(SLR)of vision-based cattle *** specifically,this SLR is to identify and analyse the research related to cattle identification using Machine Learning(ML)and Deep Learning(DL).This study retrieved 731 studies from four online scholarly ***-five articles were subsequently selected and investigated in *** the two main applications of cattle detection and cattle identification,all the ML based papers only solve cattle identification ***,both detection and identification problems were studied in the DL based *** on our survey report,the most used ML models for cattle identification were support vector machine(SVM),k-nearest neighbour(KNN),and artificial neural network(ANN).Convolutional neural network(CNN),residual network(ResNet),Inception,You Only Look Once(YOLO),and Faster R-CNN were popular DL models in the selected *** these papers,the most distinguishing features were the muzzle prints and coat patterns of *** binary pattern(LBP),speeded up robust features(SURF),scaleinvariant feature transform(SIFT),and Inception or CNN were identified as the most used feature extraction *** paper details important factors to consider when choosing a technique or *** also identified major challenges in cattle *** are few publicly available datasets,and the quality of those datasets are affected by the wild environment and movement while collecting *** processing time is a critical factor for a real-time cattle identification ***,a recommendati

关键词： Cattle identification Cattle detection Machine learning Deep learning Cattle farming

Microstructural Characteristics and Mechanical Properties of Low-Alloy, Medium-Carbon Steels After Multiple Tempering

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Acta Metallurgica Sinica(English Letters) 2019年第1期32卷 74-88页

作者： Erfan Abbasi Quanshun Luo dave Owens Materials and Engineering Research Institute Sheffield Hallam University Tyzack Machine Knives Ltd

The microstructure and mechanical properties of NiCrMoV-and NiCrSi-alloyed medium-carbon steels were investigated after multiple tempering. After austenitising, the steels were hardened by oil quenching and subsequently double or triple tempered at temperatures from 250 to 500 °C. The samples were characterised using scanning electron microscopy and X-ray diffraction, while the mechanical properties were evaluated by Vickers hardness testing, V-notched Charpy impact testing and tensile testing. The results showed that the retained austenite was stable up to 400 °C and the applied multiple tempering below this temperature did not lead to a complete decomposition of retained austenite in both steels. It was also found that the microstructure, hardness and impact toughness varied mainly as a function of tempering temperature,regardless of the number of tempering stages. Moreover, the impact toughness of NiCrMoV steel was rather similar after single/triple tempering at different temperatures, while NiCrSi steel exhibited tempered martensite embrittlement after single/double tempering at 400 °C. The observed difference was mainly attributed to the effect of precipitation behaviour due to the effect of alloying additions in the studied steels.

关键词： Medium-carbon steels Multiple tempering Alloying addition Mechanical properties Retained austenite Precipitation behaviour

Intelligent transportation systems for smart cities:a progress review

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Science China(Information Sciences) 2012年第12期55卷 2908-2914页

作者： COOPER dave E State Key Laboratory of Software Development Environment School of Computer Science and EngineeringBeihang University

To better meet the challenge of providing effective,low-cost,energy efficient transport services,the concept of intelligent transport systems(ITS) has been proposed and lauded as an innovative and promising solution for next generation transport *** this paper,the progress of ITS research around the world is briefly reviewed and current challenges are outlined,thereby offering further insight into ITS development for all researchers in this area.

关键词： intelligent transportation systems traffic information smart city

Age and outcomes of primary percutaneous intervention for ST elevation myocardial infarction in a tertiary center are we there yet？

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Journal of Geriatric Cardiology 2015年第3期12卷 263-269页

作者： Vinoda Sharma Manivannan Srinivasan dave Smith Morriston Cardiac Center Swansea Wales United Kingdom

BackgroundPrimary 经皮的干预(PPCI ) 是为圣举起的选择的治疗心肌的梗塞(STEMI ) 但是柔韧的证据在老正在缺乏。我们比较了在不同年龄 quartiles 之间的 PPCI 结果(方照 1 <；60 年，方照 2 ≥；60 到 <；70 年... 详细信息

BackgroundPrimary 经皮的干预(PPCI ) 是为圣举起的选择的治疗心肌的梗塞(STEMI ) 但是柔韧的证据在老正在缺乏。我们比较了在不同年龄 quartiles 之间的 PPCI 结果(方照 1 <；60 年，方照 2 ≥；60 到 <；70 年，方照 3 ≥；70 到 <；80 年，方照 4 ≥；80 年).MethodsRetrospective 我们的 Morriston 第三级的心脏的中心(Abertawe 兄弟 Morgannwg 大学健康板) 的观察分析经历了 *** 434 病人，的有 STEMI 的从 2005 ～ 2010 的病人(13%) 57 在方照 4 (≥；80 年) 。在老年 quartiles，病人们多半是更少收到药 eluting stent (DES， P = 0.001 ) 或 glycoprotein IIb/IIIa 禁止者(GPI， P <；0.0001 ) 。年龄的增加与幸存的减少的时间被联系(β；系数：−； 0.192， t：−； 3.70， 95%CI：−； 4.91 到 −； 1.50， P <；0.0001 ) 这是心脏性的吃惊的存在(β；系数：−； 0.194， t = 3.77， 95%CI：−； 5.26 到 −； 1.65， P <；0.0001 ) 。GPI 的使用与幸存的增加的时间被联系(β；系数：0.138， t = 2.82， 95%CI：1.58-8.58， P = 0.005 ) 但是老年 quartiles 多半是更少收到 GPI (P <；0.0001 ) 。在里面医院死亡(1.8% 方照 1， 3.6% 方照 2， 10.9% 方照 3 和 12.3% 方照 4， P = 0.002 ) 并且 1 年的死亡(5.4% 方照 1， 5.5% 方照 2， 16.8% 方照 3 和 24.6% 方照 4， P <；0.0001，分别地) 在老年 *** 是显著地更高的短术语和中间的学期死亡被看见在在 PPCI 以后老。年龄和心脏性的吃惊是预示的因素。干预不应该独自基于年龄，关于预示的因素的了解能帮助改进管理。

关键词：介入治疗年龄预后分位数可信区间 PCI 老年人 GPI

Constitutive model for monotonic and cyclic responses of loosely cemented sand formations

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第4期10卷 740-752页

作者： Mojtaba Rahimi dave Chan Alireza Nouri Department of Mechanical Engineering Azad UniversityKhomeinishahr BranchIsfahanIran Department of Civil and Environmental Engineering University of AlbertaEdmontonT6G 2W2Canada China Three Gorges University YichangChina

This paper presents a model to simulate the monotonic and cyclic behaviours of weakly cemented *** elastoplastic constitutive model within the framework of bounding surface plasticity theory is adopted to predict the mechanical behaviour of soft sandstone under monotonic and cyclic loadings. In this model, the loading surface always passes through the current stress state regardless of the type of loading. Destruction of the cementation bonds by plastic deformation in the model is considered as the primary mechanism responsible for the mechanical degradation of loosely cemented sands/weak *** model cyclic response, the unloading plastic and elastic moduli are formulated based on the loading/reloading plastic and elastic moduli. The proposed model was implemented in FLAC2D and evaluated against laboratory triaxial tests under monotonic and cyclic loadings, and the model results agreed well with the experimental observations. For cyclic tests, hysteresis loops are captured with reasonable accuracy.

关键词： Cyclic loading Monotonic loading Cemented sand Plasticity Constitutive model

Alcoholic vs. Nonalcoholic Steatohepatitis: Vascular Branching Heterogeneity on Magnetic Resonance Imaging as a Diagnostic Marker

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Journal of Clinical and Translational Hepatology 2023年第3期11卷 534-539页

作者： Daniel Garrido Nicholas Noverati Justin Robbins Jaydev K.dave Haresh Naringrekar Donald G.Mitchell Dina Halegoua-De Marzio Department of Medicine Division of Gastroenterology and HepatologyThomas Jefferson University HospitalPhiladelphiaPAUSA Department of Medicine Thomas Jefferson University HospitalPhiladelphiaPAUSA Department of Radiology Thomas Jefferson University HospitalPhiladelphiaPAUSA

Background and Aims: Distinguishing alcoholic steato-hepatitis (ASH) and nonalcoholic steatohepatitis (NASH) with biopsy alone is often difficult without a reliable clinical con-text. A novel finding on liver imaging, perivascular branching heterogeneity, has shown promise in distinguishing between these chronic liver diseases. Our study investigated the role of this finding on imaging to differentiate between ASH and NASH. The aim of this study was to determine the utility and reproducibility of this novel radiographic marker to help dis-tinguish ASH from NASH. Methods: This was a retrospective cohort study conducted between 2016 and 2020 in patients with both liver biopsy-confirmed steatohepatitis/chronic hep-atitis and abdominal magnetic resonance imaging within 13 months of each other. Two radiologists, blinded to patient clinical history and diagnosis, categorized the appearance of the liver as: 1- homogeneity, 2- mild heterogeneity, 3- mod-erate heterogeneity, 4- possible perivascular branching, 5- definite perivascular branching. Results: Of the 90 patients in the study, 60 were identified as NASH and 30 as ASH. The area under the curve (AUC) for both reader 1 and 2 when us-ing the 5-point scale was 0.69 (CI: 0.56-0.82, p=0.006) and 0.72 (CI: 0.60-0.85, p=0.001), respectively. The positive predictive value (PPV) for identification of ASH when scoring 5 was 64.7% and 66.7% for reader 1 and 2, respectively. In-terclass correlation coefficient was 0.74 in patients with ASH, indicating moderate reliability among both readers. Conclu-sions: Identification of this perivascular branching pattern on imaging is a promising novel diagnostic marker that can be used with other methods to help distinguish between ASH and NASH.

关键词： Alcoholic liver diseases Steatohepatitis Magnetic resonance imag-ing Nonalcoholic fatty liver disease