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14th International conference on Greenhouse Gas Control Technologies, GHGT 2018

作者： Miandoab, Ehsan Soroodan Kentish, Sandra E. Scholes, Colin A. Peter Cook Centre for Carbon Capture and Storage Research Department of Chemical Engineering The University of Melbourne Australia

Our modern age is undeniably dependent on fossil fuels, although enormous amounts of efforts have been devoted to utilize sustainable energies. Due to its energy-efficient nature, membrane gas separation technology has gained industrial applications in controlling greenhouse gas emissions for a number of key industries. For example, hollow fibre and spiral wound membrane modules are commercially used for gas sweetening in the natural gas industry. However, membrane technology faces some challenges that may restrict wider implementation. Part of this is the lack of detailed models to accurately simulate membrane gas separation processes. The current state of the art uses empirically based models that report gas permeances. However, non-ideal effects imposed by operating conditions as well as the nature of the feed gas may alter the structural properties of the membranes, altering the permeability of a membrane module and the subsequent carbon capture process. As such, there is need for detailed model development to address these challenges, as larger scale membrane processes will be commissioned once the performance of commercial membrane modules can be accurately simulated. mathematical models are required to evaluate the overall performance of gas separation membrane modules operating in the presence of non-ideal effects. These models can also predict the design parameters of membrane modules and facilitate process optimization. Many studies have been developed to model gas separation processes through membranes, but these neglect non-ideal effects by assuming ideal gas behaviour, negligible pressure loss at both retentate and permeate sides, assume isothermal process conditions, ignore concentration polarization effects and generally do not account for competitive sorption effects of mixed gas systems. An example of where non-ideal behaviour is important is in pressure drop induce expansion resulting in gas cooling due to the Joule-Thomson effect;the process is ra

关键词： Carbon dioxide

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modelling and Analysis of Wi-Fi and LAA Coexistence with Priority Classes 14

Modelling and Analysis of Wi-Fi and LAA Coexistence with Pri...

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14th International conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2018

作者： Baswade, Anand M. Beltramelli, Luca Antony, Franklin A Gidlund, Mikael Tamma, Bheemarjuna Reddy Guntupalli, Lakshmikanth Department of Computer Science and Engineering Indian Institute of Technology Hyderabad India Department of Information Systems and Technology Mid Sweden University Sweden

ISBN: (纸本)9781538668764

The Licensed Assisted Access (LAA) is shown as a required technology to avoid overcrowding of the licensed bands by the increasing cellular traffic. Proposed by 3GPP, LAA uses a Listen Before Talk (LBT) and backoff mechanism similar to Wi-Fi. While many mathematical models have been proposed to study the problem of the coexistence of LAA and Wi-Fi systems, few have tackled the problem of QoS provisioning, and in particular analysed the behaviour of the various classes of priority available in Wi-Fi and LAA. This paper presents a new mathematical model to investigate the performance of different priority classes in coexisting Wi-Fi and LAA networks. Using Discrete Time Markov Chains, we model the saturation throughput of all eight priority classes used by Wi-Fi and LAA. The numerical results show that with the 3GPP proposed parameters, a fair coexistence between Wi-Fi and LAA cannot be achieved. Wi-Fi users in particular suffer a significant degradation of their performance caused by the collision with LAA transmissions which has a longer duration compared to Wi-Fi transmissions. © 2018 IEEE.

关键词： Wi-Fi

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Knowledge-based parametric CAD models of configurable biomechanical structures using geometric skeletons

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COMPUTERS IN INDUSTRY 2017年 92-93卷 104-117页

作者： Demoly, Frederic Roth, Sebastien Univ Bourgogne Franche Comte UTBM CNRS UMR 6303ICB F-90010 Belfort France

This paper presents an original development of knowledge-based parametric CAD models related to configurable biomechanical structures by using an emerging modelling approach, skeleton-based modelling. Over the last decades, new geometric modelling approaches have been introduced to promote top-down or bottom-up modelling strategies even both in various engineering domains, therefore facilitating collaboration and knowledge integration. A similar effort in biomechanics still exists with such approaches in CAD application. Biomechanics is considered as a bridge discipline between medicine and mechanical engineering, which enables the geometric representation and numerical simulation of biomechanical structures based on mechanical constraints. Some mathematical models of the human body - which predict the behaviour of such mechanical structures and include the main geometric parameters and specific material properties of its components - have been proposed over the last decade in order to be the most biofidelic as possible. The development of accurate biomechanical models requires a particular attention to the shape, size and more generally the anthropometry of the geometry. Even if these models use to simulate the average population with a 50th percentile geometry, it becomes critical to develop robust and configurable models, including geometric and structural characteristics of a given population, in a parametric and central manner. The main objective is to develop knowledge-based parametric CAD models for further numerical simulations. The proposed approach reuses in part a skeleton-based modelling approach - already successfully applied in product geometric modelling - and extends it to integrate knowledge captured from the anatomical definition and behaviour of the human body. As such, to demonstrate the applicability and the relevance of the proposed approach, a human hand is introduced as a biomechanical case study and defined within a developed knowledge-based

关键词： Knowledge-based engineering Top-down modelling Geometric skeleton Parametric design CAD model Biomechanics

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Voice source modelling using modified LF model with reduced parameters 22

Voice source modelling using modified LF model with reduced ...

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22nd International conference on Knowledge-Based and Intelligent Information and engineering Systems (KES)

作者： Ben Aicha, Anis Univ Carthage COSIM Res Lab Higher Sch Commun Tunis Tunis Tunisia Univ Carthage Fac Sci Bizerte Tunis Tunisia

For many real speech applications such as speech synthesis, speech conversion it is essential to reproduce the voice source waveforms as close as possible to the real ones in order to synthesize a natural speech. In the literature, voice source waveform models such as Liljencrants-Fant (LF) synthesize the voice source waveform using mathematical expressions. Such parametrization produces a poor approximation of real voice source waveforms of the human voice. This paper presents a frequency study of the LF-model. Based on this study, we propose to enrich the spectrum and the phase of the LF-model. An analysis/synthesis scheme was set up to demonstrate the effectiveness of the proposed method. Subjective and objective measure show that the synthesized speech using the proposed method performs better when using the simple LF model. (C) 2018 The Authors. Published by Elsevier Ltd.

关键词： source voice vocal fold LF model phase

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Morphology induced variation on nanoparticle transport in human upper tracheobronchial airways 21

Morphology induced variation on nanoparticle transport in hu...

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21st Australasian Fluid Mechanics conference, AFMC 2018

作者： Ma, J.W. Shang, Y.D. Tian, L. Tu, J.Y. School of Engineering – Mechanical and Automotive RMIT University VIC3083 Australia

ISBN: (纸本)9780646597843

Nanoparticle transport and deposition in human lung has attracted considerable attention in past few decades, as it has significant value to the understanding of inhalation toxicity consequence as well as therapeutic potential in occupational health and medical applications. First task of such study is to rebuild the respiratory system, most closely resemble the physical and physiological features. In reproducing human tracheobronchial airways, two approaches were frequently employed, that are: 1) anatomical realistic reconstruction through image scans (e.g. CT and MRI) or via cadaver casts;2) mathematical description using simplified models. Strengths and limitations are primarily on accuracy, resolution, repeatability, and computational expenses. While studies using both approaches have been reported in the literature, detailed comparison of nanoparticle transport and deposition in the two representations were scarcely performed, largely due to the challenge to acquire comprehensive data from the irregular structured airway replicas (approach 1), and the computational expenses. To fill the gap, current study performed a numerical comparison of nanoparticle transport and deposition in human upper tracheobronchial airways by using an anatomical realistic reconstruction (through CT scans) and a mathematical simplified airway model. As the first step, current study was focused on the variation in breathing airflow pattern, and the effect towards fate of the inhaled nanoparticles in human upper tracheobronchial airways (trachea and the first bifurcation). The study provided important information to understand the geometry induced sensitivity of nanoparticle modelling in human tracheobronchial airway, and is of significant value to predict whole lung uptake of inhaled nanoparticles in human respiratory systems. © 2018 Australasian Fluid Mechanics Society. All rights reserved.

关键词： Nanoparticles

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Developing an Efficient Waste Management System: An Approach by Using Some Methods of mathematical modelling

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IOP conference Series: Materials Science and engineering 2020年第1期872卷

作者： K Reji Kumar E N Satheesh Department of Mathematics N S S College Cherthala Kerala India Department of Mathematics N S S College Hindu College Changanacherry Kerala India

human community has outgrown breaking the laws of the nature. This has caused serious threat to the nature and hence to the human community itself. Day to day activities of the man creates different kind of waste materials. These materials are thrown in the surroundings, which creates unpredictable damage to the environment. The matter of management of waste has prime priority in sustainable development. In this paper we mainly discuss various characteristics of waste management systems such as efficiency, sufficiency and consistency. A waste management system is developmental if it generates employment and income to the country. We develop some mathematical models which to ensure the efficiency and developmental characteristics of the waste management systems.

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human gait modeling method

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IOP conference Series: Materials Science and engineering 2020年第1期828卷

作者： S V Sivolobov A V Khoperskov V V Bumagin Volgograd State University 100 Prospect Universitetsky Volgograd 400062 Russia

The article deals with problem of human gait modelling. human gait analysis is used for various human identification tasks and for various purposes in medicine. Lagrange equations of the second kind in many research are used to model gait. We use a model of an anthropomorphic mechanism of five links to describe human movements. The mathematical model is implemented in the form of software that uses input data on the kinematics of a real gait. An important result of the study is the creation of an algorithm for calculating model parameters that best reproduce the gait of a particular person. Our approach is based on the application of a genetic algorithm to minimize a new special objective function, which depends on discrete generalized coordinates that depend on time. The dynamic picture significantly improves the quality of the model, which is able to reproduce the subtle features of the human gait.

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Study on the behaviour of tension member based on the concept of biomimics 3

Study on the behaviour of tension member based on the concep...

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3rd International conference on Recent Advances in Material Chemistry, ICRAMC 2019

作者： Sindhu Nachiar, S. Satyanarayanan, K.S. Lakshmipathy, M. Department of Civil Engineering SRMIST Kattankulathur Kanchipuram Dt Tamil Nadu India

Bio mimicry is the examination of nature, its model, system, process and element. It is used to solve human problems by imitating these in an appropriate manner. Biological creatures build amazing structures which support the required function over the duration as needed. Nature can teach us about systems, materials, processes, structures and aesthetics. The mass of the building plays a vital role with the intensity of earthquake. This paper is focused on structural design concept inspired by human skeleton. Structurally, human body is a stable vertical slender element of frameworks using bones. This key idea is taken were humerus as the adaption model for tie member. In this paper, the behaviour of human bone is studied using F.E.A (finite element analysis). The human bone is efficient in resisting compressive and tensile force. The modelling of real proximal human humerus bone is done using MIMICS and is analyzed in ANSYS under various boundary conditions. Five different shapes (Rectangle, Rectangle cross section with Parabolic curve, Rectangle cross section with Circular curve, Circular cross section and Rectangle with Hollow) of tension member which is similar the bone is modelled and analyzed. The stress pattern of real bone and the models were compared and studied. Rectangle cross section with circular curve and rectangular cross section with parabolic curve is found to be the best fit model based on the percentage of maximum stress area. Twenty shapes of models have been derived taking the rectangle circular as the reference model. A particular configuration after iteration with M40 grade of concrete is found suitable. Displacement, Stiffness, Stress and Volume of concrete were the parameters considered to define the optimised model. The model is found optimised for a tension member based on the shape and the stress pattern. © 2018 Elsevier Ltd.

关键词： Stress analysis

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modelling Uranium in Vicinity of Groundwater Population by Neural Networks of Multilayers Perceptron

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IOP conference Series: Materials Science and engineering 2020年第1期807卷

作者： Iing Lukman Noor Akma Ibrahim Natalina Dept. of Accounting Faculty of Economics Universitas Malahayati Bandar Lampung Indonesia Dept. of Mathematics Faculty of Science Universiti Putra Malaysia Serdang Selangor D.E. Malaysia Dept. of Environmental Engineering Faculty of Engineering Universitas Malahayati Bandarlampung Indonesia

The existent of Uranium in vicinity of groundwater population can give a threat to the water supplier for human consumption. The objective of the research was to find the most important variables to the existence of the Uranium. This paper shows some modelling process for above matters by applying Neural Networks of Multilayers Perceptron. Data taken from US Department of Energy. Neural Networks used in this study were learning the representation of the model inside the data, and how best it relation with the output variable that we obtained from prediction. The results showed that the training samples was 87 out of 127, and the testing samples was 40 out of 127. The results were not giving indication that a mathematical model obtained. The conclusion was Conductivity becoming the most important variable to the existence of Uranium, which followed by the second importance that was Arsenic, the third importance was Selenium, the fourth important was Total Alkalinity.

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Cost function evaluation for optimizing design and actuation of an active exoskeleton to ergonomically assist lifting motions

Cost function evaluation for optimizing design and actuation...

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IEEE-RAS International conference on humanoid Robots

作者： Monika Harant Matthew Millard Nejc Šarabon Katja Mombaur Institute of Computer Engineering Heidelberg University Heidelberg Germany S2P Science to Practice Ltd. Laboratory for Motor Control and Motor Behaviour Techonology park Ljubljana Slovenia

ISBN: (数字)9781538676301

ISBN: (纸本)9781538676318

Spinal exoskeletons can reduce the risk of low-back pain by decreasing the back muscle activity and the spinal compression forces of users during heavy lifting tasks. Model-based simulation and optimization are helpful tools to support the design of exoskeletons reducing the number of prototypes iterations and testings. In this paper, we present a comparison of different cost functions based on modeling and optimization techniques to determine proper actuator characteristics for an active spinal exoskeleton supporting stoop-lifts of a 10 kg box. Using motion recordings of five different subjects and additional anthropometric measurements, we created subject-specific musculoskeletal models. A corresponding parameterized model of an exoskeleton with passive and active components was created and combined with the human models. The spring characteristics and the torque profiles of the exoskeleton are optimized for various objectives which consist of a term for tracking the recordings and an additional term from a set of cost functions to reduce the load on the subjects. User comfort is guaranteed by appropriate interaction force limits. The results show that all cost functions reduced significantly the human torque loads. However, they result in different amounts and distributions of the load reduction as well as different contributions from the passive and active components of the exoskeleton. They also yield different actuation patterns of the human model performing the stoop-lift. The analysis of the effects of cost functions in this study highlights the importance of selecting an appropriate cost function for optimization.

关键词： Exoskeletons Cost function Muscles mathematical model Load modeling Dynamics Springs

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