Dynamics (Pembroke, Ont.)最新文献_第6页

Role of Mixing Dynamics on Mass Convection-Diffusion in Sparkling Wines: A Laboratory Study 混合动力学在气泡酒质量对流扩散中的作用:实验室研究

Dynamics (Pembroke, Ont.) Pub Date : 2022-09-27 DOI: 10.3390/dynamics2040018

F. Beaumont, F. Bogard, S. Murer, G. Polidori

{"title":"Role of Mixing Dynamics on Mass Convection-Diffusion in Sparkling Wines: A Laboratory Study","authors":"F. Beaumont, F. Bogard, S. Murer, G. Polidori","doi":"10.3390/dynamics2040018","DOIUrl":"https://doi.org/10.3390/dynamics2040018","url":null,"abstract":"This study is based on the hypothesis that the bubbles-induced vortex flows could enhance the release of carbon dioxide (CO2) from a glass of effervescent wine. To provide tangible evidence, we conducted a series of experiments, the first of which aimed to correlate the filling height and the bubble-induced flow dynamics with the CO2 volume flux released from the vessel during a tasting. The results obtained through micro-weighing and PIV experiments showed a correlation between the filling height, the mixing flow dynamics, and the amount of CO2 released at the air/wine interface by several mechanisms (bubble burst, diffusion). In order to hide the role of bubbles, we proposed a simple experimental device that consisted in stirring the wine (supersaturated in dissolved gas) mechanically, while avoiding the phenomenon of nucleation. This mechanical stirring system allowed for controlling the intensity of convective movements of the liquid phase by varying the rotation frequency of a glass rod. The results of this experiment have provided irrefutable evidence of a close link between the stirring dynamics of a wine supersaturated in dissolved gases and the release of CO2 by a mass convection-diffusion phenomenon.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79302358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Non-Cosmological, Non-Doppler Relativistic Frequency Shift over Astronomical Distances 天文距离上的非宇宙学、非多普勒相对论频移

Dynamics (Pembroke, Ont.) Pub Date : 2022-09-08 DOI: 10.3390/dynamics2030017

G. D’Abramo

引用次数: 0

A Necessary and Sufficient Condition in the Model of Kondepudi and Nelson for the Breaking of Chiral Symmetry Kondepudi和Nelson模型中手性对称破缺的一个充分必要条件

Dynamics (Pembroke, Ont.) Pub Date : 2022-09-07 DOI: 10.3390/dynamics2030016

Jason Andrew Colwell

引用次数: 0

The Wind Dynamics of Super-Eddington Sources in FRADO FRADO中超级爱丁顿源的风动力学

Dynamics (Pembroke, Ont.) Pub Date : 2022-08-21 DOI: 10.3390/dynamics2030015

M. Naddaf, B. Czerny, M. Zajaček

引用次数: 0

Multiobjective Optimization of a Fed-Batch Bienzymatic Reactor for Mannitol Production 甘露醇加料间歇式双酶反应器的多目标优化

Dynamics (Pembroke, Ont.) Pub Date : 2022-08-19 DOI: 10.3390/dynamics2030014

G. Maria, Laura Renea, C. Maria

{"title":"Multiobjective Optimization of a Fed-Batch Bienzymatic Reactor for Mannitol Production","authors":"G. Maria, Laura Renea, C. Maria","doi":"10.3390/dynamics2030014","DOIUrl":"https://doi.org/10.3390/dynamics2030014","url":null,"abstract":"Enzymatic reactions can successfully replace complex chemical syntheses using milder reaction conditions and generating less waste. The developed model-based numerical analysis turned out to be a beneficial tool to determine the optimal operating policies of complex multienzymatic reactors. As proved, for such cases, the determination of a Fed-Batch Reactor (FBR) optimal operating policy results in a difficult multiobjective optimization problem. Exemplification is made for the bienzymatic reduction of D-fructose to mannitol by using MDH (mannitol dehydrogenase) and nicotinamide adenine dinucleotide (NADH) cofactor with the in situ continuous regeneration of NADH at the expense of formate degradation in the presence of FDH (formate dehydrogenase). For such a coupled system, the model-based engineering evaluations must account for multiple competing (opposable) optimization objectives. Among the multiple novelty elements: i) an optimally operated FBR with a tightly controlled variable feeding (of the time stepwise type) during the batch can lead to higher performance; ii) the optimally operated FBR reported better performance compared to an optimally single or cyclic BR, or to optimally serial batch-to-batch reactors (SeqBR), when considering a multiobjective optimization; iii) the concomitant variable feeding with substrate, enzymes, and cofactor during the FBR “time-arcs” is an option seldom approached in the literature but which is proved here, leading to consistent economic benefits.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84096780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Statistical Mechanics of Long Walks in Dynamic Complex Networks: Statistical Arguments for Diversifying Selection 动态复杂网络中长距离行走的统计力学:多样化选择的统计论证

Dynamics (Pembroke, Ont.) Pub Date : 2022-08-12 DOI: 10.3390/dynamics2030013

D. Volchenkov, C. Suh

引用次数: 1

Biomechanical Upper Limb Model for Postural Tremor Absorber Design 体位性震颤减震器设计的生物力学上肢模型

Dynamics (Pembroke, Ont.) Pub Date : 2022-08-01 DOI: 10.3390/dynamics2030012

S. Gebai, G. Cumunel, M. Hammoud, G. Foret, Emmanuel Roze, Elodie Hainque

{"title":"Biomechanical Upper Limb Model for Postural Tremor Absorber Design","authors":"S. Gebai, G. Cumunel, M. Hammoud, G. Foret, Emmanuel Roze, Elodie Hainque","doi":"10.3390/dynamics2030012","DOIUrl":"https://doi.org/10.3390/dynamics2030012","url":null,"abstract":"The current work promotes the use of non-invasive devices for reducing involuntary tremor of human upper limb. It concentrates on building up an upper limb model used to reflect the measured tremor signal and is suitable for the design of a passive vibration controller. A dynamic model of the upper limb is excited by the measured electromyography signal scaled to reach the wrist joint angular displacement measured by an inertial measurement unit for a patient with postural tremor. A passive tuned-mass-damper (TMD) placed on the hand is designed as a stainless-steel beam with a length of 91 mm and a cross-sectional diameter of 0.79 mm, holding a mass of 14.13 g. The damping ratio and mass position of the TMD are optimized numerically. The fundamental frequency of the TMD is derived and validated experimentally through measurements for different mass positions, with a relative error of 0.65%. The modal damping ratio of the beam is identified experimentally as 0.14% and increases to 0.26–0.46% after adding the mass at different positions. The optimized three TMDs reduce 97.4% of the critical amplitude of the power spectral density at the wrist joint.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77035652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Mixing Processes of LPG Gases in Tanks When Transporting by Sea 液化石油气海上运输罐内混合过程分析

Dynamics (Pembroke, Ont.) Pub Date : 2022-07-12 DOI: 10.3390/dynamics2030011

L. Morozyuk, B. Kosoy, Viktoriia Sokolovska-Yefymenko, V. Ierin

{"title":"Analysis of Mixing Processes of LPG Gases in Tanks When Transporting by Sea","authors":"L. Morozyuk, B. Kosoy, Viktoriia Sokolovska-Yefymenko, V. Ierin","doi":"10.3390/dynamics2030011","DOIUrl":"https://doi.org/10.3390/dynamics2030011","url":null,"abstract":"The present study is an analysis of the processes in the components of the LPG (propane/butane) reliquefaction plant under the conditions of co-mingling in tanks when transporting by sea. For the analysis, the monitoring data of an LPG cargo operation have been used. An energy analysis of the mixture-based reliquefaction plant has been performed. The characteristics of the mixture in the tanks, the operating conditions of the reliquefaction plant, and the performance of the system have been considered. The method of equivalence has been applied for thermodynamic analysis. The result of the substitution of actual processes with equivalent ones allows for the accomplishment of the parameters control of each working fluid within the mixture as a pure working fluid. It is shown that the low-boiling component determines the operating parameters of the entire reliquefaction plant. The method of equivalence and visualization of the processes within the LPG as a mixture using the thermodynamic diagrams of pure working fluids is recommended to shorten the path to set up the appropriate reliquefaction plant management strategy. The energy analysis performed using the method of equivalent cycles has been validated with the existing reliquefaction plant characteristics. The inaccuracies are in the limit of 4%.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72423235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Quantum Brain Dynamics and Holography 量子脑动力学和全息

Dynamics (Pembroke, Ont.) Pub Date : 2022-06-17 DOI: 10.3390/dynamics2020010

A. Nishiyama, S. Tanaka, J. Tuszynski

引用次数: 2

Exact Solutions to Navier–Stokes Equations Describing a Gradient Nonuniform Unidirectional Vertical Vortex Fluid Flow 描述梯度非均匀单向垂直涡旋流体流动的Navier-Stokes方程的精确解

Dynamics (Pembroke, Ont.) Pub Date : 2022-06-12 DOI: 10.3390/dynamics2020009

N. Burmasheva, E. Prosviryakov

{"title":"Exact Solutions to Navier–Stokes Equations Describing a Gradient Nonuniform Unidirectional Vertical Vortex Fluid Flow","authors":"N. Burmasheva, E. Prosviryakov","doi":"10.3390/dynamics2020009","DOIUrl":"https://doi.org/10.3390/dynamics2020009","url":null,"abstract":"The paper announces a family of exact solutions to Navier–Stokes equations describing gradient inhomogeneous unidirectional fluid motions (nonuniform Poiseuille flows). The structure of the fluid motion equations is such that the incompressibility equation enables us to establish the velocity defect law for nonuniform Poiseuille flow. In this case, the velocity field is dependent on two coordinates and time, and it is an arbitrary-degree polynomial relative to the horizontal (longitudinal) coordinate. The polynomial coefficients depend on the vertical (transverse) coordinate and time. The exact solution under consideration was built using the method of indefinite coefficients and the use of such algebraic operations was for addition and multiplication. As a result, to determine the polynomial coefficients, we derived a system of simplest homogeneous and inhomogeneous parabolic partial equations. The order of integration of the resulting system of equations was recurrent. For a special case of steady flows of a viscous fluid, these equations are ordinary differential equations. The article presents an algorithm for their integration. In this case, all components of the velocity field, vorticity vector, and shear stress field are polynomial functions. In addition, it has been noted that even without taking into account the thermohaline convection (creeping current) all these fields have a rather complex structure.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88770616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5