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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： Moj.aba Nabipoor Hassankiadeh j.ngsi Yang Mark Berrey Dave j.rdison 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

Putting PLX5622 into perspective:microglia in central nervous system viral infection

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Neural Regeneration Research 2023年第6期18卷 1269-1270页

作者： Alanna G.spiteri Nicholas j.C.King Viral Immunopathology Laboratory InfectionImmunity and Inflammation Research ThemeSchool of Medical SciencesFaculty of Medicine and HealthThe University of SydneySydneyNSWAustralia Sydney Cytometry The University of Sydney and Centenary InstituteSydneyNSWAustralia Ramaciotti Facility for Human Systems Biology The University of Sydney and Centenary InstituteSydneyNSWAustralia Charles Perkins Centre The University of SydneyAustralia The University of Sydney Institute for Infectious Diseases The University of SydneySydneyNSWAustralia The University of Sydney Nano Institute the University of SydneySydneyNSWAustralia

Elucidating the exact contribution of microglia to central nervous system(CNS)pathology has historically been extremely *** resident parenchymal myeloid cells are considered to have critical roles as frontline responders during pathogen invasion and CNS ***,understanding the precise temporal kinetics of microglial function is central to the evolution of novel therapeutics for disease intervention and/or resolution(spiteri et al.,2022a).The development of PLX5622,a colony-stimulating factor 1 receptor(CSF-1R)inhibitor typically formulated into a rodent chow for simple oral administration has facilitated exploration of microglial functions in disease(Spangenberg et al.,2019).

关键词： invasion system precise

Optimal decentralized control of large scale systems

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Control Theory and Technology 2016年第4期14卷 287-313页

作者： Xiao Qi SHI Daniel E. DAVISON raymond KWONG Edward j. DAVISON Systems Control Group Department of Electrical and Computer Engineering University of Toronto Ontario Canada MSS 3G4 Department of Electrical and Computer Engineering University of Waterloo Ontario Canada N2L 3G1

This paper presents a new optimized decentralized controller design method for solving the tracking and disturbance rej.ction problems for large-scale linear time-invariant systems, using only low-order decentralized controllers. To illustrate the type of results which can be obtained using the new optimized decentralized control design method, the control of a large flexible space structure is studied and compared with the standard centralized LQR-observer controller. The order of the resultant decentralized controller is much smaller than that of the standard centralized LQR-observer controller. The proposed controller also has certain fail-safe properties and, in addition, it can be five orders of magnitude more robust than the standard LQR-observer controller based on their real stability radii. The new decentralized controller design method is applied to a large flexible space structure system with 5 inputs and 5 outputs and of order 24.

关键词： Decentralized control multivariable control PID control robustness optimization large-scale systems flexiblestructures

Plant-based nutrition for healthcare professionals： implementing diet as aprimary modality in the prevention and treatment of chronic disease

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j.urnal of Geriatric Cardiology 2017年第5期14卷 355-368页

作者： j.lieanna Hever raymond j.Cronise To Your Health Fitness and Nutrition Beverly Hills CA USA Thermogenex Huntsville AL USA

Cardiovascular disease remains the world＇s leading cause of death. Yet, we have known for decades that the vast maj.rity of athero-sclerosis and its subsequent morbidity and mortality are influenced predominantly by diet. This paper will describe a health-promoting wholefood, plant-based diet; delineate macro- and micro-nulxition, emphasizing specific geriatric concerns; and offer guidance to physicians andother healthcare practitioners to support patients in successfully utilizing nutrition to improve their health.

关键词： Aging Health span Plant-based nutrition Preventive medicine Vegetarian

Binding of Cry δ-endotoxins to brush border membrane vesicles of Helicoverpa armigera and Helicoverpa punctigera （Lepidoptera： Noctuidae）

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Insect Science 2005年第4期12卷 231-240页

作者： CHUNYAN LIAO LIZ BROOKS STEPHEN C. TROWELL raymond j. AKHURST CSIRO Entomology Australian National University ACT Australia Division of Biochemistry and Molecular Biology Australian National University ACT Australia

The relatively low susceptibility ofHelicoverpa armigera to CrylAc, its history of resistance to chemical insecticides and the seasonal decline in expression of CrylAc in transgenic cotton necessitated the development of cotton expressing two insecticidal proteins to provide sustainable control of this multinational pest. To manage the resistance issue, it was essential that the second insecticidal protein have a significantly different mode of action to CrylAc. A common feature of resistance to CrylA proteins in several species as well as H. armigera has been a change in the binding site. A study of binding sites for some Cry proteins in the brush border membrane vesicles （BBMV） ofH. armigera and Helicoverpa punctigera was undertaken. The binding affinity for CrylAc was higher than for CrylAb, matching their relative toxicities, and CrylAc and CrylAb were found to share at least one binding site in both I-1. armigera and I-1. punctigera. However Cry2Aa did not compete with CrylAc for binding and so could be used in transgenic cotton in combination with CrylAc to control H. armigera and manage resistance. Variation in the susceptibilities of three different H. armigera strains to CrylAc correlated with the parameter Bmax/Kcom.

关键词： Helicoverpa armigera Helicoverpa punctigera Bacillus thuringiensis δ-endotoxin brush border membrane vesicles ligand binding

Allometric models for estimating aboveground biomass in the tropical woodlands of Ghana, West Africa

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Forest Ecosystems 2020年第3期7卷 539-561页

作者： raymond Aabeyir Stephen Adu-Bredu Wilson Agyei Agyare Michael j.C.Weir Department of Environment and Resource Studies UDS-Wa CampusWaGhana WASCAL Graduate Research Programme on Climate Change and Land Use KNUSTKumasiGhana Biodiversity Conservation and Ecosystem Division CSIR-Forestry Research Institute of GhanaKumasiGhana Department of Agricultural and Biosystems Engineering KNUSTKumasiGhana Department of Natural Resources Faculty of Geoinformation Science and Earth Observation(ITC)University of TwenteEnschedethe Netherlands

Background: Modelling aboveground biomass(AGB) in forest and woodland ecosystems is critical for accurate estimation of carbon stocks. However, scarcity of allometric models for predicting AGB remains an issue that has not been adequately addressed in Africa. In particular, locally developed models for estimating AGB in the tropical woodlands of Ghana have received little attention. In the absence of locally developed allometric models, Ghana will continue to use Tier 1 biomass data through the application of pantropic models. Without local allometric models it is not certain how Ghana would achieve Tier 2 and 3 levels under the United Nations programme for reducing emissions from deforestation and forest degradation. The obj.ctive of this study is to develop a mixedspecies allometric model for use in estimating AGB for the tropical woodlands in Ghana. Destructive sampling was carried out on 745 trees(as part of charcoal production) for the development of allometric equations. Diameter at breast height(dbh, i.e. 1.3 m above ground level), total tree height(H) and wood density(ρ) were used as predictors for the models. Seven models were compared and the best model selected based on model efficiency,bias(%) and corrected Akaike Information Criterion. The best model was validated by comparing its results with those of the pantropic model developed by Chave et al.(Glob Chang Biol 20:3177–3190, 2014) using equivalence test and conventional paired ***: The results revealed that the best model for estimating AGB in the tropical woodlands is AGB =0.0580ρ((dbh)2 H)0.999. The equivalence test showed that this model and the pantropic model developed by Chave et al.(Glob Chang Biol 20:3177–3190, 2014) were equivalent within ±10% of their mean predictions(p-values <0.0001 for one-tailed t-tests for both lower and upper bounds at 5% significant level), while the paired t-test revealed that the mean(181.44 ± 18.25 kg) of the model predictions of the best model of this s

关键词： Charcoal Diameter at breast height Tree height Wood density Savannah woodland

Endogenous bioelectric fields: a putative regulator of wound repair and regeneration in the central nervous system

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Neural Regeneration Research 2016年第6期11卷 861-864页

作者： Matthew L.Baer raymond j.Colello Department of Anatomy & Neurobiology Virginia Commonwealth University

Studies on a variety of highly regenerative tissues, including the central nervous system（CNS） in non-mammalian vertebrates, have consistently demonstrated that tissue damage induces the formation of an ionic current at the site of inj.ry. These inj.ry currents generate electric fields（EF） that are 100-fold increased in intensity over that measured for uninj.red tissue. In vitro and in vivo experiments have convincingly demonstrated that these electric fields（by their orientation, intensity and duration） can drive the migration, proliferation and differentiation of a host of cell types. These cellular behaviors are all necessary to facilitate regeneration as blocking these EFs at the site of inj.ry inhibits tissue repair while enhancing their intensity promotes repair. Consequently, inj.ry-induced currents, and the EFs they produce, represent a potent and crucial signal to drive tissue regeneration and repair. In this review, we will discuss how inj.ry currents are generated, how cells detect these currents and what cellular responses they can induce. Additionally, we will describe the growing evidence suggesting that EFs play a key role in regulating the cellular response to inj.ry and may be a therapeutic target for inducing regeneration in the mammalian CNS.

关键词： repair regeneration currents inducing consistently regulating migration potent wound facilitate

A Classical Field Theory of Gravity and Electromagnetism

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j.urnal of Modern Physics 2014年第10期5卷 928-939页

作者： raymond j. Beach Lawrence Livermore National Laboratory Livermore USA

A classical field theory of gravity and electromagnetism is developed. The starting point of the theory is the Maxwell equations which are directly tied to the Riemann-Christoffel curvature tensor. This is done through the derivatives of the Maxwell tensor which are equated to a vector field ?contracted with the curvature tensor, i.e., . The electromagnetic portion of the theory is shown to be equivalent to the classical Maxwell equations with the addition of a hidden variable. Because the proposed equations describing electromagnetism and gravity differ from the classical Maxwell-Einstein equations, their ability to describe classical physics is shown for several situations by direct calculation. The inclusion of antimatter and its behavior in a gravitational field, and the possibility of particle-like solutions exhibiting quantized charge, mass and angular momentum are discussed.

关键词： Classical Field Theory Gravitation and Electromagnetism General Relativity Antimatter Antimatter Gravity Hidden Variable Theories Riemann Geometry

Prevalence of Careers in Psychology Courses at American Universities

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考试与评价（大学英语四级考试版） 2009年第11期 37-38页

作者： raymond j. Green

大学不仅要开设普通的心理学课程，而且还要在心理学课程里加入有关将来职业规划的课题，这是社会经济结构发展要求大学成为职业训练和准备基地的必然结果。美国的一些研究表明，开设此类课题的意义重大，有助于大学生储备与将来职业相... 详细信息

大学不仅要开设普通的心理学课程，而且还要在心理学课程里加入有关将来职业规划的课题，这是社会经济结构发展要求大学成为职业训练和准备基地的必然结果。美国的一些研究表明，开设此类课题的意义重大，有助于大学生储备与将来职业相关的知识，有助于大学生在毕业之后找到较好的工作……

关键词：高校英语课外阅读阅读材料