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1
Stark, Sanja, Emilie Frost, and Marvin Nebel-Wenner. "Distributed Multi-objective Optimization in Cyber-Physical Energy Systems." ACM SIGEnergy Energy Informatics Review 4, no. 2 (April 2024): 7–18. http://dx.doi.org/10.1145/3666043.3666046.
Анотація:
Managing complex Cyber-Physical Energy Systems (CPES) requires solving various optimization problems with multiple objectives and constraints. As distributed control architectures are becoming more popular in CPES for certain tasks due to their flexibility, robustness, and privacy protection, multi-objective optimization must also be distributed. For this purpose, we present MO-COHDA, a fully distributed, agent-based algorithm, for solving multi-objective optimization problems of CPES. MO-COHDA allows an easy and flexible adaptation to different use cases and integration of custom functionality. To evaluate the effectiveness of MO-COHDA, we compare it to a central NSGA-2 algorithm using multi-objective benchmark functions from the ZDT problem suite. The results show that MO-COHDA can approximate the reference front of the benchmark problems well and is suitable for solving multi-objective optimization problems. In addition, an example use case of scheduling a group of generation units while optimizing three different objectives was evaluated to show how MO-COHDA can be easily applied to real-world optimization problems in CPES.
2
An, Siguang, Shiyou Yang, Yanan Bai, and Xiushan Wu. "An improved physical programming method for multi-objective inverse problems." International Journal of Applied Electromagnetics and Mechanics 52, no. 3-4 (December 29, 2016): 1151–59. http://dx.doi.org/10.3233/jae-162123.
3
KALTENBACHER, MANFRED. "COMPUTATIONAL ACOUSTICS IN MULTI-FIELD PROBLEMS." Journal of Computational Acoustics 19, no. 01 (March 2011): 27–62. http://dx.doi.org/10.1142/s0218396x11004286.
Анотація:
We present physical/mathematical models base on partial differential equations (PDEs) and efficient numerical simulation schemes based on the Finite Element (FE) method for multi-field problems, where the acoustic field is the field of main interest. Acoustics, the theory of sound, is an emerging scientific field including disciplines from physics over engineering to medical science. We concentrate on the following three topics: vibro-acoustics, aero-acoustics and high intensity focused ultrasound. For each topic, we discuss the physical/mathematical modeling, efficient numerical schemes and provide practical applications.
4
Sun, Bao, Na Guo, Lijing Zhang, and Zhanlong Li. "A Hybrid Strategy Guided Multi-Objective Artificial Physical Optimizer Algorithm." Information Technology and Control 53, no. 1 (March 22, 2024): 128–45. http://dx.doi.org/10.5755/j01.itc.53.1.33456.
Анотація:
Artificial physical optimizer (APO), as a new heuristic stochastic algorithm, is difficult to balance convergence and diversity when dealing with complex multi-objective problems. This paper introduces the advantages of R2 indicator and target space decomposition strategy, and constructs the candidate solution of external archive pruning technology selection based on APO algorithm. A hybrid strategy guided multi-objective artificial physical optimizer algorithm (HSGMOAPO) is proposed. Firstly, R2 indicator is used to select the candidate solutions that have great influence on the convergence of the whole algorithm. Secondly, the target space decomposition strategy is used to select the remaining solutions to improve the diversity of the algorithm. Finally, the restriction processing method is used to improve the ability to avoid local optimization. In order to verify the comprehensive ability of HSGMOAPO algorithm in solving multi-objective problems, five comparison algorithms were evaluated experimentally on standard test problems and practical problems. The results show that HSGMOAPO algorithm has good convergence and diversity in solving multi-objective problems, and has the potential to solve practical problems.
5
Liu, Caiyu, Zuofeng Zhou, and Qingquan Wu. "Physical characteristics and spillage detection Using multi-feature fusion." Journal of Physics: Conference Series 2083, no. 2 (November 1, 2021): 022041. http://dx.doi.org/10.1088/1742-6596/2083/2/022041.
Анотація:
Abstract As an important part of road maintenance, the detection of road sprinkles has attracted extensive attention from scholars. However, after years of research, there are still some problems in the detection of road sprinkles. First of all, the detection accuracy of traditional detection algorithm is deficient. Second, deep learning approaches have great limitations for there are various kinds of sprinkles which makes it difficult to build a data set. In view of the above problems, this paper proposes a road sprinkling detection method based on multi-feature fusion. The characteristics of color, gradient, luminance and neighborhood information were considered in our method. Compared with other traditional methods, our method has higher detection accuracy. In addition, compared with deep learning-based methods, our approach doesn’t involve creating a complex data set and reduces costs. The main contributions of this paper are as follows: I. For the first time, the density clustering algorithm is combined with the detection of sprinkles, which provides a new idea for this field. II. The use of multi-feature fusion improves the accuracy and robustness of the traditional method which makes the algorithm usable in many real-world scenarios.
6
Pyatikopov, Sergey Mikhailovich, Tofik Dzhabrail oglu Aliyev, and Svetlana Aleksandrovna Kovaleva. "Problems of physical culture management in the university." KANT 39, no. 2 (June 15, 2021): 393–98. http://dx.doi.org/10.24923/2222-243x.2021-39.68.
Анотація:
The purpose of the study is to develop a system of measures for the comprehensive restructuring and democratization of the mechanisms of physical culture management in higher education institutions. The article deals with the problems of physical culture management in higher education institutions. Recently, great importance has been paid to the development of physical culture in society, attracting a large number of people to engage in mass sports. An important role in this is also provided by physical education in universities. In this regard, there is a situation in changing the structure of the management of physical culture in universities, the search for new approaches in the organization of the physical culture student movement. Which actualizes the problem. The scientific novelty lies in the theoretical substantiation of the mechanisms of effective management of physical culture at the university. As a result, a project of a targeted comprehensive program for the development of physical culture in a higher educational institution was developed, which passed a multi-stage expert assessment.
7
Bai, Bing. "Special Issue on the Geo-Environmental Problems Caused by Underground Construction." Applied Sciences 13, no. 19 (September 27, 2023): 10754. http://dx.doi.org/10.3390/app131910754.
Анотація:
Geo-environmental disturbances refer to the significant changes in physical, mechanical, and even chemical properties of soils; are closely related to interrelated multi-physical field coupling systems of solid particles, water, and gas in the shallow stratum; and are caused by underground engineering construction [...]
8
Rahnejat, H. "Multi-body dynamics: Historical evolution and application." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 214, no. 1 (January 1, 2000): 149–73. http://dx.doi.org/10.1243/0954406001522886.
Анотація:
The historical developments in the discipline of engineering dynamics are briefly reviewed, with attention paid to the formulation and solution of the dynamic behaviour of multi-body systems. It is shown that the dynamic characteristics of practical multi-body systems are dependent upon the interactions of many physical phenomena that can induce, restrain or constrain motion of parts. The long process of understanding and formulating the physics of multi-body motions, in some cases with pioneering contributions centuries old, together with continual refinements in numerical techniques and enhanced computing power has resulted in the solution of quite complex and practical engineering problems. Linking the historical developments to the fundamental physical phenomena and their interactions, the paper presents solutions to two complex multi-body dynamic problems. The practical implications of the approach in design of these systems are highlighted.
9
Wang, Haoxiang, Tao Yu, Tianwei Yang, Hui Qiao, and Qionghai Dai. "Neural Physical Simulation with Multi-Resolution Hash Grid Encoding." Proceedings of the AAAI Conference on Artificial Intelligence 38, no. 6 (March 24, 2024): 5410–18. http://dx.doi.org/10.1609/aaai.v38i6.28349.
Анотація:
We explore the generalization of the implicit representation in the physical simulation task. Traditional time-dependent partial differential equations (PDEs) solvers for physical simulation often adopt the grid or mesh for spatial discretization, which is memory-consuming for high resolution and lack of adaptivity. Many implicit representations like local extreme machine or Siren are proposed but they are still too compact to suffer from limited accuracy in handling local details and a long time of convergence. We contribute a neural simulation framework based on multi-resolution hash grid representation to introduce hierarchical consideration of global and local information, simultaneously. Furthermore, we propose two key strategies: 1) a numerical gradient method for computing high-order derivatives with boundary conditions; 2) a range analysis sample method for fast neural geometry boundary sampling with dynamic topologies. Our method shows much higher accuracy and strong flexibility for various simulation problems: e.g., large elastic deformations, complex fluid dynamics, and multi-scale phenomena which remain challenging for existing neural physical solvers.
10
Zhao, Ruochen, Liang Huang, Haiyue Zhao, Yan Cao, Weijun Tian, and Ning Wang. "Study of Mask Electrochemical Machining for Ring Narrow Groove under the Action of Multiple Physical Fields." Coatings 12, no. 5 (April 29, 2022): 605. http://dx.doi.org/10.3390/coatings12050605.
Анотація:
Deep and narrow groove structures are widely used in aviation, aerospace, weapons, and other industries, and play a very important role. In order to solve the problems of machining tool deformation, machining flying edge, burr in traditional Computerized Numerical Control (CNC) milling for deep and narrow grooves, and the problems of serious motor loss and low machining efficiency in non-contact electrical discharge machining (EDM), electrochemical mask machining through the mask treatment of the non-processed part mask processing, and with no loss of the processing cathode tool, was suggested as an efficient way to solve these problems. Considering that the corrosion removal of the anodic workpiece is mainly subject to the multi-physical field coupling action between the electric field, the flow field, and the temperature field, it is necessary to construct a multi-physical field coupling model of electrochemical mask machining and combine this with the numerical simulation analysis to realize the distribution state of the multi-physical field, so as to realize the optimization guidance of the overall processing process.
11
Kolditz, Olaf, and Sebastian Bauer. "A process-oriented approach to computing multi-field problems in porous media." Journal of Hydroinformatics 6, no. 3 (July 1, 2004): 225–44. http://dx.doi.org/10.2166/hydro.2004.0017.
Анотація:
Object-oriented methods are becoming more and more important in order to meet the challenges in scientific computing, such as the treatment of coupled multi-field problems with high spatial resolution. This paper introduces an object-oriented concept for modelling multi-process systems in porous media. The basic idea is the direct representation of a physical process by an object of the numerical code. Because a physical process can be represented by a field variable and an equation system, the process object contains the equation system for the field variable as well as all methods needed for building and solving the equation system. The process object is thus self-configuring and well encapsulated, which are the main advantages of this new approach and thus allows for an easy extension to more complex applications with a higher number of processes. The design and implementation of the object-oriented concept for the presented process objects is described in detail and illustrated by a set of application examples.
12
Journal, Baghdad Science. "Solution of Nonlinear High Order Multi-Point Boundary Value Problems By Semi-Analytic Technique." Baghdad Science Journal 11, no. 2 (June 1, 2014): 220–28. http://dx.doi.org/10.21123/bsj.11.2.220-228.
Анотація:
In this paper, we present new algorithm for the solution of the nonlinear high order multi-point boundary value problem with suitable multi boundary conditions. The algorithm is based on the semi-analytic technique and the solutions are calculated in the form of a rapid convergent series. It is observed that the method gives more realistic series solution that converges very rapidly in physical problems. Illustrative examples are provided to demonstrate the efficiency and simplicity of the proposed method in solving this type of multi- point boundary value problems.
13
Bucur, Vlad, and Liviu-Cristian Miclea. "Multi-Cloud Resource Management Techniques for Cyber-Physical Systems." Sensors 21, no. 24 (December 15, 2021): 8364. http://dx.doi.org/10.3390/s21248364.
Анотація:
Information technology is based on data management between various sources. Software projects, as varied as simple applications or as complex as self-driving cars, are heavily reliant on the amounts, and types, of data ingested by one or more interconnected systems. Data is not only consumed but is transformed or mutated which requires copious amounts of computing resources. One of the most exciting areas of cyber-physical systems, autonomous vehicles, makes heavy use of deep learning and AI to mimic the highly complex actions of a human driver. Attempting to map human behavior (a large and abstract concept) requires large amounts of data, used by AIs to increase their knowledge and better attempt to solve complex problems. This paper outlines a full-fledged solution for managing resources in a multi-cloud environment. The purpose of this API is to accommodate ever-increasing resource requirements by leveraging the multi-cloud and using commercially available tools to scale resources and make systems more resilient while remaining as cloud agnostic as possible. To that effect, the work herein will consist of an architectural breakdown of the resource management API, a low-level description of the implementation and an experiment aimed at proving the feasibility, and applicability of the systems described.
14
Kwon, Ilan, Oejin Shin, Sojung Park, and Goeun Kwon. "Multi-Morbid Health Profiles and Specialty Healthcare Service Use: A Moderating Role of Poverty." International Journal of Environmental Research and Public Health 16, no. 11 (June 1, 2019): 1956. http://dx.doi.org/10.3390/ijerph16111956.
Анотація:
Increasing life expectancy in the USA makes a better understanding of the heterogeneous healthcare needs of the aging population imperative. Many aging studies have discovered multimorbid health problems focusing mainly on various physical health conditions, but not on combined mental or behavioral health problems. There is also a paucity of studies with older adults who use professional healthcare services caring for their mental and substance-related conditions. This study aims to enhance the knowledge of older peoples’ complex healthcare needs involving physical, mental, and behavioral conditions; examine the relationship between multi-morbid health profiles and specialty healthcare service utilization; and investigate its association to poverty. The study data were derived from the National Survey on Drug Use and Health (NSDUH) in 2013 (n = 6296 respondents aged 50 years and older). To identify overall health conditions, nine indicators, including physical, mental, and substance/alcohol, were included. Healthcare service utilization was measured with four mutually exclusive categories: No treatment, mental health treatment only, substance use treatment only, and both. We identified four health profiles: Healthy (82%), having physical health problems (6%), physical and mental health problems (4%), and behavioral problems (8%). Older people’s health profiles were differentially associated with healthcare use. Those living in poverty with both physical and mental health problems or substance/alcohol health problems were less likely to receive mental health and substance use treatments than those with more financial resources. Implications for geriatric healthcare practices and policy are discussed.
15
Petrenko, Vyacheslav, and Mikhail Gurchinskiy. "Multi-agent deep reinforcement learning concept for mobile cyber-physical systems control." E3S Web of Conferences 270 (2021): 01036. http://dx.doi.org/10.1051/e3sconf/202127001036.
Анотація:
High complexity of mobile cyber physical systems (MCPS) dynamics makes it difficult to apply classical methods to optimize the MCPS agent management policy. In this regard, the use of intelligent control methods, in particular, with the help of artificial neural networks (ANN) and multi-agent deep reinforcement learning (MDRL), is gaining relevance. In practice, the application of MDRL in MCPS faces the following problems: 1) existing MDRL methods have low scalability; 2) the inference of the used ANNs has high computational complexity; 3) MCPS trained using existing methods have low functional safety. To solve these problems, we propose the concept of a new MDRL method based on the existing MADDPG method. Within the framework of the concept, it is proposed: 1) to increase the scalability of MDRL by using information not about all other MCPS agents, but only about n nearest neighbors; 2) reduce the computational complexity of ANN inference by using a sparse ANN structure; 3) to increase the functional safety of trained MCPS by using a training set with uneven distribution of states. The proposed concept is expected to help address the challenges of applying MDRL to MCPS. To confirm this, it is planned to conduct experimental studies.
16
MA, TIANBAO, JIANGUO NING, and CHENG WANG. "EULERIAN NUMERICAL METHOD FOR SIMULATION OF EXPLOSION PROBLEMS." Modern Physics Letters B 23, no. 03 (January 30, 2009): 497–500. http://dx.doi.org/10.1142/s0217984909018746.
Анотація:
This paper presents an adaptive grid subdivision algorithm based on the Youngs' interface reconstruction algorithm to treat the advection of the mixed grids in the multi-material Eulerian method. The advantage of this algorithm is that it only needs to calculate the advection between pure grids, escaping the complexity encountered in the advection of mixed grids with two materials. In addition, this algorithm is a multi-dimensional advection algorithm, and it can decrease the error encountered in the direction-split advection algorithm. In order to verify the efficiency of the proposed adaptive grid subdivision algorithm in the actual physical field, it is added to the indigenously developed EXPLOSION-2D simulation software, and some numerical tests are performed to demonstrate the utility of this algorithm. The simulation results verify that the adaptive grid subdivision algorithm is simple and efficient.
17
Manogaran, Gunasekaran, P. Shakeel, H. Fouad, Yunyoung Nam, S. Baskar, Naveen Chilamkurti, and Revathi Sundarasekar. "Wearable IoT Smart-Log Patch: An Edge Computing-Based Bayesian Deep Learning Network System for Multi Access Physical Monitoring System." Sensors 19, no. 13 (July 9, 2019): 3030. http://dx.doi.org/10.3390/s19133030.
Анотація:
According to the survey on various health centres, smart log-based multi access physical monitoring system determines the health conditions of humans and their associated problems present in their lifestyle. At present, deficiency in significant nutrients leads to deterioration of organs, which creates various health problems, particularly for infants, children, and adults. Due to the importance of a multi access physical monitoring system, children and adolescents’ physical activities should be continuously monitored for eliminating difficulties in their life using a smart environment system. Nowadays, in real-time necessity on multi access physical monitoring systems, information requirements and the effective diagnosis of health condition is the challenging task in practice. In this research, wearable smart-log patch with Internet of Things (IoT) sensors has been designed and developed with multimedia technology. Further, the data computation in that smart-log patch has been analysed using edge computing on Bayesian deep learning network (EC-BDLN), which helps to infer and identify various physical data collected from the humans in an accurate manner to monitor their physical activities. Then, the efficiency of this wearable IoT system with multimedia technology is evaluated using experimental results and discussed in terms of accuracy, efficiency, mean residual error, delay, and less energy consumption. This state-of-the-art smart-log patch is considered as one of evolutionary research in health checking of multi access physical monitoring systems with multimedia technology.
18
Wang, Yao, Chunyan Sun, and Ying Guo. "A Multi-Attribute Fuzzy Evaluation Model for the Teaching Quality of Physical Education in Colleges and Its Implementation Strategies." International Journal of Emerging Technologies in Learning (iJET) 16, no. 02 (January 26, 2021): 159. http://dx.doi.org/10.3991/ijet.v16i02.19725.
Анотація:
There are two major problems with teaching quality evaluation of physical education (PE) in colleges: the excessive number of evaluation factors, and the incomplete evaluation system. To solve the problems, this paper puts forward a multi-attribute fuzzy evaluation model of college PE teaching quality, and provides the strategies to implement the model. Firstly, the problems of college PE teaching were analyzed, and a novel multi-dimensional evaluation system was developed for college PE teaching quality. To quantify college PE teaching quality, an evaluation model of college PE teaching quality was established based on the Grey Relational Analysis (GRA). In addition, several strategies were presented to improve college PE teaching quality. The proposed model and strategies provide a good reference for solving similar complex system problems.
19
Mangion, Mariella, and Sandra C. Buttigieg. "Multi-type childhood maltreatment: associations with health risk behaviours and mental health problems in adolescence." Journal of Children's Services 9, no. 3 (September 9, 2014): 191–206. http://dx.doi.org/10.1108/jcs-09-2013-0033.
Анотація:
Purpose – The purpose of this paper is to determine whether multi-type child maltreatment is associated with health-risk behaviours and mental ill-health in adolescence. Design/methodology/approach – In total, 406 15-16-year-old students from Maltese schools answered the “Child maltreatment physical and mental health” questionnaire (Nguyen et al., 2010). This assessed demographics, health risk behaviour, mental health and child maltreatment. Findings – Of the four categories of maltreatment measured (physical, sexual, emotional and neglect), 27.4 per cent of the young people experienced one type, 16.6 per cent two types, 11.1 per cent three and 6.5 per cent four. For health-risk behaviours, there were positive relationships between multi-type maltreatment and school fights (r=0.27, p<0.01), breaking school rules (r=0.19, p<0.01), illicit drug use (r=0.14, p<0.05) and alcohol use (r=0.10, p<0.05). As regards mental health, multi-type maltreatment was positively associated with depression (r=0.38, p<0.01) and anxiety (r=0.23, p<0.01), and negatively associated with self-esteem (r=−0.26, p<0.01). Practical implications – Early recognition of multi-type maltreatment and its consequences enables providers of children's services to offer the required diverse range of services. Additionally, policy makers should ensure the adoption of multi-sectoral and collaborative inter-agency approaches so as to effectively and holistically manage child maltreatment, not only during the acute childhood phase but also during adolescence and adulthood, when consequences are expected to emerge. Originality/value – This study raises awareness about the prevalence of multi-type child maltreatment in Malta. It also highlights the negative association between cumulative exposure to multi-type child maltreatment and mental health outcomes and risky behaviours.
20
Rajan, Durairaj. "Health problems among radiographers: A comparative study in Tirunelveli city." Proceedings of London International Conferences, no. 9 (April 7, 2024): abs1. http://dx.doi.org/10.31039/plic.2024.9.204.
Анотація:
This survey based descriptive research work has been undertaken in Tirunelveli city, Tamil Nadu with the objective of examining various health problems of radiographers working in private multi-speciality hospitals and diagnostic centres. In order to know the health-related problems, the present study has examined nine variables related to both physical and mental health. The study has sampled 120 radiographers (60 respondents from private multi-speciality hospitals and 60 from diagnostic centres) using both convenience and judgement sampling techniques. Primary data for the study were collected using questionnaire method. Secondary data were collected from books, journals and websites. Percentage, Mean and Standard Deviation have been administered to understand perception of radiographers towards various health related problems. The result of the study has discovered that tiredness and low energy; body pain; difficulties in sleeping; depression, anger and emotional disturbances; and digestive disorders have been highly perceived by radiographers working in private multi-speciality hospitals than diagnostic centres. Skin and eye problems; urinary tract infection; diabetes mellitus and hypertension; and irregular menstrual, weight loss and hair loss have been equally perceived by radiographers working both in private multi-speciality hospitals and diagnostic centres. The perception of the respondents of both kinds of organizations towards the discussed variables is moderate.
21
Wang, Chen, Can Zhu, Kun Xiao, Yutong Tang, and Haidong Zhen. "Visualization of Emergency Evacuation Physical Behavior under Multi-Agent Decision-Making." Applied Sciences 13, no. 9 (April 28, 2023): 5509. http://dx.doi.org/10.3390/app13095509.
Анотація:
Emergency evacuation simulation is significant for architectural design and emergency plan implementation. To explore the influence of evacuees’ physical behavior and evacuees’ decisions on the evacuation process, as well as to address the problems of traditional emergency evacuation models with insufficient detail of the situation (realism), low reusability, poor operability, and lack of subsequent scalability, this paper first analyzed pedestrian characteristics in emergencies. To describe pedestrian decision-making in an emergent evacuation situation, a multi-agent design based on decision theory was proposed, solving the multi-agent decision-making problem in an emergency evacuation environment by the A* algorithm. Then the designed multi-agent was embedded into the social force model by AnyLogic software. Finally, the model reproduces the pedestrian evacuation process in an emergency evacuation situation on the built platform, depicting three kinds of typical behaviors: pedestrian partnering, obstacle avoidance, and exit competition. In addition, this study also analyzed a large student apartment building by example and proposed corresponding optimization solutions to improve its evacuation capacity through simulation results.
22
Stone, Candy, Jane Fossey, and Antoinette Broad. "The Oxfordshire Integrated Care Home Support Service: New developments to address the health and wellbeing of people with dementia in care homes." FPOP Bulletin: Psychology of Older People 1, no. 133 (January 2016): 58–65. http://dx.doi.org/10.53841/bpsfpop.2016.1.133.58.
Анотація:
This article describes how a fully integrated multi-disciplinary physical and mental healthcare team has been developed, by reshaping existing services, to meet mental healthcare needs and treat behavioural and psychological symptoms of dementia (BPSD) and physical healthcare problems in Oxfordshire’s care homes through an integrated Care Home Support Service (ICHSS).
23
Bykov, Dmitry, and Dmitry Efimov. "Modern Solutions to Modeling and Optimization of the Steady State of Multi-Energy Systems." E3S Web of Conferences 209 (2020): 02007. http://dx.doi.org/10.1051/e3sconf/202020902007.
Анотація:
A complex solution of problem of creating mathematical models of multi-energy systems is possible using a unified approach. An approach that will ensure consistent construction of mathematical models and unification of computational algorithms. The paper presents the elements of the concept of energy circuits as a basis for unified modeling of systems of different physical nature. The existing and developed approaches to solving the problems of calculating the flow distribution in multi-energy systems are presented, based on the analysis of publications on this subject. The general structure of the mathematical model of the flow distribution in a multi-energy system and the set of optimization problems for steady-state operating conditions are described. A possible formulation of the optimization problem for the short-term operation of a multi-energy system is presented.
24
Phipps, Andrew, and Douglas Turkington. "Psychiatry in the renal unit." Advances in Psychiatric Treatment 7, no. 6 (November 2001): 426–32. http://dx.doi.org/10.1192/apt.7.6.426.
Анотація:
Consultation–liaison psychiatry in renal medicine provides a unique experience for the psychiatrist. There is the opportunity to work with a specialist multi-disciplinary team managing patients with chronic and complex physical problems in in-patient and out-patient settings. We aim to consider the common psychiatric problems experienced by renal patients and the particular problems that face the renal team and the liaising psychiatrist in relation to assessment and treatment.
25
Wei, Dan, Tiejun Zhou, Yunqing Huang, and Kai Jiang. "A Multi-Category Inverse Design Neural Network and Its Application to Diblock Copolymers." Mathematics 10, no. 23 (November 25, 2022): 4451. http://dx.doi.org/10.3390/math10234451.
Анотація:
In this work, we design a multi-category inverse design neural network to map ordered periodic structures to physical parameters. The neural network model consists of two parts, a classifier and Structure-Parameter-Mapping (SPM) subnets. The classifier is used to identify structures, and the SPM subnets are used to predict physical parameters for desired structures. We also present an extensible reciprocal-space data augmentation method to guarantee the rotation and translation invariant of periodic structures. We apply the proposed network model and data augmentation method to two-dimensional diblock copolymers based on the Landau–Brazovskii model. Results show that the multi-category inverse design neural network has high accuracy in predicting physical parameters for desired structures. Moreover, the idea of multi-categorization can also be extended to other inverse design problems.
26
Ye, Chenxiao, Jiantao Che, Tianyi Han, and Hai Huang. "Multi-Band Analysis on Physical Properties of the Quasi-Two-Dimensional Superconductor NbSe2." Coatings 13, no. 3 (March 3, 2023): 548. http://dx.doi.org/10.3390/coatings13030548.
Анотація:
The discovery of quasi-two-dimensional superconductors bears consequences for both basic research and practical applications. However, the mechanism of superconductivity and the form of order parameters are still controversial problems for the transition metal dichalcogenide NbSe2 thin film. Under the Neumann boundary condition, the physical properties of this compound are investigated within the two-component Ginzburg–Landau theory. We compute the upper critical field in an arbitrary direction and the temperature dependence of critical supercurrent density through this layered system. All of our theoretical calculations fit the experimental measurements well; thus, this study strongly provides evidence of two-gap s-wave superconductivity in the NbSe2 thin film.
27
Zhu, Zhongpan, Qiwei Du, Zhipeng Wang, and Gang Li. "A Survey of Multi-Agent Cross Domain Cooperative Perception." Electronics 11, no. 7 (March 30, 2022): 1091. http://dx.doi.org/10.3390/electronics11071091.
Анотація:
Intelligent unmanned systems for ground, sea, aviation, and aerospace application are important research directions for the new generation of artificial intelligence in China. Intelligent unmanned systems are also important carriers of interactive mapping between physical space and cyberspace in the process of the digitization of human society. Based on the current domestic and overseas development status of unmanned systems for ground, sea, aviation, and aerospace application, this paper reviewed the theoretical problems and research trends of multi-agent cross-domain cooperative perception. The scenarios of multi-agent cooperative perception tasks in different areas were deeply investigated and analyzed, the scientific problems of cooperative perception were analyzed, and the development direction of multi-agent cooperative perception theory research for solving the challenges of the complex environment, interactive communication, and cross-domain tasks was expounded.
28
Mithrason, Arun T., and Gomathy Parasuraman. "Physical problems and needs of patients in palliative care center." International Journal Of Community Medicine And Public Health 4, no. 11 (October 25, 2017): 4145. http://dx.doi.org/10.18203/2394-6040.ijcmph20174818.
Анотація:
Background: Palliative care provides care in the relief of pain and other distressing symptoms by early identification and impeccable assessment. The problems of the people suffering from incurable diseases are multiple and multi-dimensional. Also, suffering caused by the same problem differs among individuals. To provide effective and quality palliative care services, the health care team needs quality information about what the patients really need and what are their priority problems from their own point of view. This study aims to find out the problems and needs of palliative care patients.Methods: A cross sectional study was done in ‘Jeevodaya Hospice care Centre’, located in North Chennai in Mathoor, Manali. 60 patients were included in the study. Questionnaire on problems and needs in palliative care was used to cover the physical problems. Data was analyzed using SPSS version 17.Results: The most common physical problems perceived by the study subjects were pain (100%), insomnia (93.3%), fatigue (88.3%) and loss of appetite (83.3%).Conclusions: This study indicates a need for more professional attention for palliative care patients. This does not imply dissatisfaction with present care. In fact, it is a desire for future care and room for improvement, not a judgment of the quality of care in the present or past.
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LI, SHU-YOU, ZHI-HUI DU, MENG-YUE WU, JING ZHU, and SAN-LI LI. "ON THE PHYSICAL APPLICATION OF SIMULATED ANNEALING ALGORITHM." International Journal of Modern Physics C 10, no. 06 (September 1999): 1065–70. http://dx.doi.org/10.1142/s0129183199000863.
Анотація:
A high-performance general program is presented to deal with the multi-parameter optimization problems in physics. Considering the requirements of physical application, some small but significant modifications were made on the conventional simulated annealing algorithm. A parallel realization was suggested to further improve the performance of the program. Mathematical and physical examples were taken to test the feasibility and the efficiency of the program. The source code is available from the authors free of charge.
30
Patel, Pooja, Tyler Frederick, and Sean A. Kidd. "Physical health, community participation and schizophrenia." Journal of Health Psychology 23, no. 1 (September 13, 2016): 79–83. http://dx.doi.org/10.1177/1359105316666654.
Анотація:
Our objective is to identify links between physical health and community participation among individuals with schizophrenia or a psychosis mental illness. Semi-structured qualitative and quantitative interviews and community tours were conducted over 10 months ( N = 30). Interviews were transcribed and analyzed using a grounded theory coding strategy. Physical health played an important role in community participation both as a cause and consequence. Key processes included mobility issues impeding physical community involvement; a multi-directional relationship between social relationships, community involvement, and physical health; identity as a mechanism linking physical health problems and community engagement; and the potential for community-based mental health programs.
31
Satish Babu, Jampani, and Gonuguntla Krishna Mohan. "An Intelligent Multi-Objective Evolutionary Model for Establishing Security in Cyber-Physical Systems." Ingénierie des systèmes d information 27, no. 2 (April 30, 2022): 213–21. http://dx.doi.org/10.18280/isi.270205.
Анотація:
The modelling of an efficient CPS is emphasis with the origin of novel functionality over the applications with various design elements. These elements are generally uncertain where these elements include sensors, scheduling, resources, and optimization process. Here, an extensive analysis is carried out with the modelling of CPS element-driven problem formulation. The formulated problems are resolved using a multi-objective evolutionary (MOEA) algorithm to show the intelligence of the optimization approach in the CPS design level. The proposed MOEA shows the viability of the CPS element-driven problem in an explicit manner. The feasibility of the uncertain CPS is measured with the suitability measures in diverse perspectives. The efficiency of the MOEA is examined over the MATLAB 2020a simulation environment. The proposed MOEA model gives better trade-off in contrary to prevailing optimization approaches.
32
Ranjbar, Mojtaba, and Leila Khodayari. "A numerical study of RBFs-DQ method for multi-asset option pricing problems." Boletim da Sociedade Paranaense de Matemática 36, no. 1 (January 1, 2018): 9. http://dx.doi.org/10.5269/bspm.v36i1.29641.
Анотація:
In this paper, we propose a numerical scheme to solve multi-dimensional Black-Scholes equation using the global radial basis functions-based dierential quadrature (RBFs-DQ) method. Before applying the method, it is needed to remove mixed derivatives from the Black-Scholes equation by making an appropriate change of variables . Then, any spatial derivatives are approximated by a linear weighted sum of all the function values in the whole physical domain. In the RBFs-DQ method the weighting coecients are computed by RBFs. The method is very easy to implement and the non-singularity is ensured. The proposed method com bines the advantages of the conventional DQ method and the RBFs. It also remains mesh-free feature of RBFs.
33
Reato, Federico Maria, Claudio Ricci, Jan Misfatto, Matteo Calzaferri, and Simone Cinquemani. "An Alternative Multi-Physics-Based Methodology for Strongly Coupled Electro-Magneto-Mechanical Problems." Algorithms 16, no. 6 (June 19, 2023): 306. http://dx.doi.org/10.3390/a16060306.
Анотація:
The analysis of complex systems tends to be approached through a separation and a simplification of the main macro phenomena and, thus, addressed through dedicated techniques, tools, and algorithms. A smart and interesting possibility, instead, is represented by the so-called model-based design analysis, which allows one to interface phenomena coming from interactions of different physical natures. This paper aims to propose a multi-physics Matlab/Simulink®-based architecture that allows one to integrate general and strongly non-linear coupling phenomena, taking efforts from two novel implemented bi-directional co-simulation routines based on Spice® and ESRF Radia® engines. Emphasis is dedicated to the discussion and description of the co-simulation algorithms and processes characteristic of these routines, which allow the analog electronic and the magneto dynamic domain’s integration under a single simulation environment. To highlight the reliability of the multi-domain architecture and to validate the reported co-simulation results, a comparison with the experimental measures obtained on an innovative MEMS electromagnetic actuator are proposed.
34
Yang, Hoe-Hyung. "Problems and care plans for multicultural families in the AI era." Research Society for the Korean Language Education 21 (April 30, 2024): 51–74. http://dx.doi.org/10.25022/jkler.2024.21.051.
Анотація:
The purpose of this study is that in the AI era, now we are faced up that the multi-cultural families and their members are experiencing the realistic difficulties which was brought about by the multi-cultural phenomenon, so I would like to suggest that how can our society have receptive attitude for them and also suggest about care plan for them. Our reality is facing a national crisis of population decline and labor shortage. The world is changing at a very rapid pace, and technological civilization is becoming more advanced. However, the area where progress is particularly slow is in terms of immigrants settling into Korean society, learning the Korean language, and accepting to Korean culture, just like as soul-food. It is also time for us to pay attention to the physical, mental and psychological difficulties which the members of multi-cultural families are experiencing. It is time for us to need some concerns and cares about that quick change from unfamiliarity to familiarity within their family relationships, in adjusting in school life of their children, and in their living environment. Counseling and therapeutic approaches to these people should also be implemented in parallel with Korean language education and cultural adaption education. It is also necessary to refine laws and systems. We must recognize that these people are also members of our society, and we need to put our heads together for the wisdom.
35
Alvarez, Jesus, Ignacio Gómez-Revuelto, Jose M. Alonso, Luis E. Garcia-Castillo, and Magdalena Salazar-Palma. "Fully Coupled Multi-Hybrid Finite Element Method–Method of Moments–Physical Optics Method for Scattering and Radiation Problems." Electromagnetics 30, no. 1-2 (March 9, 2010): 3–22. http://dx.doi.org/10.1080/02726340903485232.
36
Pu, Ruilong, and Xinlong Feng. "Physics-Informed Neural Networks for Solving Coupled Stokes–Darcy Equation." Entropy 24, no. 8 (August 11, 2022): 1106. http://dx.doi.org/10.3390/e24081106.
Анотація:
In this paper, a grid-free deep learning method based on a physics-informed neural network is proposed for solving coupled Stokes–Darcy equations with Bever–Joseph–Saffman interface conditions. This method has the advantage of avoiding grid generation and can greatly reduce the amount of computation when solving complex problems. Although original physical neural network algorithms have been used to solve many differential equations, we find that the direct use of physical neural networks to solve coupled Stokes–Darcy equations does not provide accurate solutions in some cases, such as rigid terms due to small parameters and interface discontinuity problems. In order to improve the approximation ability of a physics-informed neural network, we propose a loss-function-weighted function strategy, a parallel network structure strategy, and a local adaptive activation function strategy. In addition, the physical information neural network with an added strategy provides inspiration for solving other more complicated problems of multi-physical field coupling. Finally, the effectiveness of the proposed strategy is verified by numerical experiments.
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Durand, Loyal. "Fractional operators and multi-integral representations for associated Legendre functions." Journal of Mathematical Physics 63, no. 3 (March 1, 2022): 033503. http://dx.doi.org/10.1063/5.0066214.
Анотація:
In a recent paper, Cohl and Costas-Santos derived a number of interesting multi-derivative and multi-integral relations for the associated Legendre and Ferrers functions in which the orders of those functions are changed in integral steps. These are of potential use in a number of physical problems. We show here how their results can be derived simply from more general relations involving non-integer changes in the order obtained using the fractional group operator methods developed earlier for SO(2,1), E(2,1) and its conformal extension, and SO(3). We also present general integral relations for fractional changes of the degrees of the functions and related multi-derivative and multi-integral representations.
38
Kawabata, Yoshito, and Wan-Ling Tseng. "Relational and physical victimization, friendship, and social and school adjustment in Taiwan." Journal of Social and Personal Relationships 36, no. 6 (April 15, 2018): 1559–78. http://dx.doi.org/10.1177/0265407518767771.
Анотація:
This short-term longitudinal study examined the differential pathways from relational and physical victimization to internalizing and externalizing problems and academic achievement as well as the roles of friendships and friendship quality in these pathways with a Taiwanese sample ( N = 471; 53.3% boys; mean age = 9.95 years). A multi-informant approach was used to collect the data. Relational and physical victimization and the number of friendships were assessed via peer nominations. Adjustment problems, achievement, and friendship quality were measured by mother, teacher, and child reports, respectively. Results of Structural Equation Modeling showed that the paths from relational victimization to adjustment problems were indirectly influenced by positive or negative friendship quality. Specifically, relational victimization was associated with negative friendship quality indexed by high levels of exclusivity and conflict, which in turn resulted in more severe internalizing and externalizing adjustment problems 6 months later. Lower levels of relational victimization were linked to positive friendship quality indexed by high levels of companionship, help, closeness, and intimacy, which in sequence contributed to better academic achievement. These indirect effects were not evidenced for the number of friendships or the paths from physical victimization to adjustment problems and achievement. There were no gender differences in the measurement or structural part of the model. These findings are discussed from developmental, social, and cultural perspectives.
39
Vafin, A. Y., E. I. Aukhadeev, R. S. Sadykova, and R. A. Bodrova. "The strategy of improving medical service for sports and physical culture in the Republic of Tatarstan on the eve of 2013 Summer Universiade." Kazan medical journal 94, no. 3 (June 15, 2013): 397–402. http://dx.doi.org/10.17816/kmj2193.
Анотація:
The problems of healthcare system formation and management for physical culture and sports are discussed within the framework of prevention and rehabilitation areas development in the Republic of Tatarstan. The 2013 Summer Universiade is acknowledged as the largest event in the international sports, involving 13 000 sportsmen participating in 27 different summer sports. Physical culture and sports healthcare is known to be the one of the most crucial factors influencing sporting achievements. Since 2013 the Centre for Medical Prevention has started to create the informational and analytical system required for integral, in-depth and systemic image of physical culture and sports healthcare status and problems in the Republic of Tatarstan. A multi-layer matrix of the data gathering within the healthcare system, including the elements of physical culture and sports healthcare. We offer to create a national program the basing on the modern methodology of science for studying and solving complex social problems. The development of the local program devoted to physical culture and sports healthcare improvement can be a model of similar methodology-based program formation with a wider coverage, allowing to provide the preventive and rehabilitation healthcare for the whole population.
40
Evangelista, Stefania, Gaspare Giovinco, and Selahattin Kocaman. "A multi-parameter calibration method for the numerical simulation of morphodynamic problems." Journal of Hydrology and Hydromechanics 65, no. 2 (June 1, 2017): 175–82. http://dx.doi.org/10.1515/johh-2017-0014.
Анотація:
Abstract Calibration of parameters of mathematical models is still a tough task in several engineering problems. Many of the models adopted for the numerical simulations of real phenomena, in fact, are of empirical derivation. Therefore, they include parameters which have to be calibrated in order to correctly reproduce the physical evidence. Thus, the success of a numerical model application depends on the quality of the performed calibration, which can be of great complexity, especially if the number of parameters is higher than one. Calibration is traditionally performed by engineers and researchers through manual trial-and-error procedures. However, since models themselves are increasingly sophisticated, it seems more proper to look at more advanced calibration procedures. In this work, in particular, an optimization technique for a multi-parameter calibration is applied to a two-phase depth-averaged model, already adopted in previous works to simulate morphodynamic processes, such as, for example, the dike erosion by overtopping.
41
Calcaterra, Valeria, Luca Marin, Matteo Vandoni, Virginia Rossi, Agnese Pirazzi, Roberta Grazi, Pamela Patané, et al. "Childhood Obesity and Incorrect Body Posture: Impact on Physical Activity and the Therapeutic Role of Exercise." International Journal of Environmental Research and Public Health 19, no. 24 (December 13, 2022): 16728. http://dx.doi.org/10.3390/ijerph192416728.
Анотація:
Obesity is associated with various dysfunctions of the organism, including musculoskeletal problems. In this narrative review, we aim to consider postural problems in children and adolescents with obesity, focusing on the relationship with its negative impact on physical activity, and to discuss the role of exercise as a therapeutic approach. The body reacts to excess weight by changing its normal balance, and the somatosensory system of children with obesity is forced to make major adjustments to compensate for postural problems. These adaptations become more difficult and tiring if activities that require continuous postural changes and multi-tasking are engaged in. Children with obesity have less body control and functional ability due to the excess fat mass, which reduces their ability to perform motor skills and take part in physical activity. Appropriate early interventions for the management of musculoskeletal problems are needed to ensure healthy growth and to prevent comorbidities in childhood and adulthood. Prevention programs must be based not only on the reduction of body weight but also on the definition of correct postural habits from an early age. It is equally important to provide correct information on the types and doses of physical activity that can help prevent these problems.
42
van Eijk, Jacques Th M., Hans Bosma, Catharina C. M. Jonkers, Femke Lamers, and Paul E. M. Muijrers. "Prescribing Antidepressants and Benzodiazepines in the Netherlands: Is Chronic Physical Illness Involved?" Depression Research and Treatment 2010 (2010): 1–6. http://dx.doi.org/10.1155/2010/105931.
Анотація:
In this study we assessed differences in new and repeat prescriptions of psycho-tropics between patients receiving prescriptions for drugs to treat a common chronic disease and people without such prescriptions. The study used the databases of two Dutch health insurance companies (3 million people). We selected all Dutch men and women aged 45 and older who were registered for six consecutive years (1999–2004). Our analyses both found a consistent relation between psycho-tropics on the one hand and physical illness on the other. People with multi-morbidity were prescribed these drugs most often, especially men and those younger than 65. Epidemiological studies showed a prevalence of depression among people with multi-morbidity to be twice as high as among people without such conditions. According to recent guidelines non-drug treatment may be the first therapy option for patients with non severe depression. If prescribed for a long time, benzodiazepine prescriptions are especially known to be addictive. Our data raise the question to what extent patients with a chronic physical disease suffering from co-occurring mental problems are prescribed psycho-tropics in accord with the guidelines that also advise mental support in case of non severe mental problems. Further research can answer this important question.
43
Park, Jung Sun, Jong Bin Im, and Youg Hee Ro. "Optimization of Composite Housing in a Multi-Special Camera Using Kriging Algorithm." Key Engineering Materials 334-335 (March 2007): 341–44. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.341.
Анотація:
This paper is concerned with the optimization of composite housing in a multi-spectral camera using Kriging algorithm. The effective use of Kriging on physical problems has been expanded to provide global approximations for optimization problems. There are two major strategies to improve efficiency and accuracy of approximate optimization using Kriging. These methods are performed by the stochastic process, stochastic-localization method (SLM), as the criterion to move the local domains and the design of experiment (DOE), the classical design and space-filling design. The proposed methodology is applied to the design of a Multi-Spectral Camera (MSC), as a practical example, which will provide high resolution panchromatic and multi-spectral images and is carried by a satellite designed to fulfill the need for further Earth observation and allowing scientists and communication experts to conduct potentially valuable experiments. When this composite structure is optimized, design constraints are taken for natural frequency and shear stress which should be considered in a launching environment.
44
Zhang, Kehan, and Yue An. "Research on Multiphysics Coupling Relationship for the IPT System in Seawater Environment." World Electric Vehicle Journal 12, no. 4 (November 10, 2021): 230. http://dx.doi.org/10.3390/wevj12040230.
Анотація:
Wireless charging in the marine environment has problems such as high loss and low efficiency. In order to solve these problems, based on the wireless power transmission technology in the seawater environment, this paper studies the multi-physical field coupling relationship of the underwater IPT system. Through researching on the law of mutual influence and interaction between the fields, the relationship between the physical fields is established. The software is used to establish a system simulation model, the dataset is solved and analyzed to get the distribution of electric field, magnetic field, thermal field, and flow field, which provides a theoretical basis for the model and optimization of the IPT system in the seawater.
45
Tao, Yuan, Wanzeng Liu, Jun Chen, Jingxiang Gao, Ran Li, Jiaxin Ren, and Xiuli Zhu. "A Self-Supervised Learning Approach for Extracting China Physical Urban Boundaries Based on Multi-Source Data." Remote Sensing 15, no. 12 (June 19, 2023): 3189. http://dx.doi.org/10.3390/rs15123189.
Анотація:
Physical urban boundaries (PUBs) are basic geographic information data for defining the spatial extent of urban landscapes with non-agricultural land and non-agricultural economic activities. Accurately mapping PUBs provides a spatiotemporal database for urban dynamic monitoring, territorial spatial planning, and ecological environment protection. However, traditional extraction methods often have problems, such as subjective parameter settings and inconsistent cartographic scales, making it difficult to identify PUBs objectively and accurately. To address these problems, we proposed a self-supervised learning approach for PUB extraction. First, we used nighttime light and OpenStreetMap road data to map the initial urban boundary for data preparation. Then, we designed a pretext task of self-supervised learning based on an unsupervised mutation detection algorithm to automatically mine supervised information in unlabeled data, which can avoid subjective human interference. Finally, a downstream task was designed as a supervised learning task in Google Earth Engine to classify urban and non-urban areas using impervious surface density and nighttime light data, which can solve the scale inconsistency problem. Based on the proposed method, we produced a 30 m resolution China PUB dataset containing six years (i.e., 1995, 2000, 2005, 2010, 2015, and 2020). Our PUBs show good agreement with existing products and accurately describe the spatial extent of urban areas, effectively distinguishing urban and non-urban areas. Moreover, we found that the gap between the national per capita GDP and the urban per capita GDP is gradually decreasing, but regional coordinated development and intensive development still need to be strengthened.
46
Saburi, Tei, Shiro Kubota, Yuji Wada, and Masatake Yoshida. "Development of Coupled Fluid-Structure Interaction Code for Explosion Problem." Materials Science Forum 767 (July 2013): 92–97. http://dx.doi.org/10.4028/www.scientific.net/msf.767.92.
Анотація:
A multidimensional analysis code for reactive shocks (MARS), which is developed to solve various problems in the physical hazard analysis of high energetic materials, has been applied to such complex problems as multi-material problem and sympathetic problem because it can employ various types of equations of state and a materials database. However, it was difficult to meet a growing demand for large-scale analysis and fluid-structure interaction (FSI) analysis. To address these issues, this study reports a parallelization of the code and an implementation of the functional capability of FSI analysis, and performance results for sample problems were also shown.
47
Maißer, P. "Multi-body dynamics and electromechanics: From a differential-geometric point of view." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 219, no. 2 (June 1, 2005): 147–58. http://dx.doi.org/10.1243/146441905x34135.
Анотація:
Mechanics is the origin of physics. Almost any physical theory like electrodynamics stems from mechanical explanations. The mathematical-geometric considerations in mechanics serve as a prototype for other physical theories. Consequently, developments in modern physics in turn have a feedback to mechanics in terms of its representation. The laws of nature can be expressed as differential equations. The fact that these equations can be solved by average computers has led most engineers and many mathematical physicists to neglect geometrical aspects for solving and better understanding their problems. The intimate relation between geometry and analysis led to the differential geometry, which is a valuable tool for a better understanding in many physical disciplines like classical mechanics, electrodynamics, and nowadays in mechatronics. It has been the development of the theory of relativity that revealed the paramount importance of the differential geometry. Many problems in research and development can be studied by differential-geometric methods. Modern non-linear control theories, for instance, are entirely based on the differential geometry. This paper addresses some aspects in mathematical modelling of multi-body and electromechanical systems. The motivation for this research arises from applications of linear induction machines in modern transport technologies.
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Ogbonnaya, Chukwuma, Chamil Abeykoon, Adel Nasser, and Ali Turan. "A Computational Approach to Solve a System of Transcendental Equations with Multi-Functions and Multi-Variables." Mathematics 9, no. 9 (April 21, 2021): 920. http://dx.doi.org/10.3390/math9090920.
Анотація:
A system of transcendental equations (SoTE) is a set of simultaneous equations containing at least a transcendental function. Solutions involving transcendental equations are often problematic, particularly in the form of a system of equations. This challenge has limited the number of equations, with inter-related multi-functions and multi-variables, often included in the mathematical modelling of physical systems during problem formulation. Here, we presented detailed steps for using a code-based modelling approach for solving SoTEs that may be encountered in science and engineering problems. A SoTE comprising six functions, including Sine-Gordon wave functions, was used to illustrate the steps. Parametric studies were performed to visualize how a change in the variables affected the superposition of the waves as the independent variable varies from x1 = 1:0.0005:100 to x1 = 1:5:100. The application of the proposed approach in modelling and simulation of photovoltaic and thermophotovoltaic systems were also highlighted. Overall, solutions to SoTEs present new opportunities for including more functions and variables in numerical models of systems, which will ultimately lead to a more robust representation of physical systems.
49
Piston, David W. "Multi-Photon Excitation Microscopy: An Old Idea in Quantum Theory Applied to Modern Scientific Problems." Microscopy and Microanalysis 6, S2 (August 2000): 1180–81. http://dx.doi.org/10.1017/s1431927600038393.
Анотація:
Multi-photon excitation microscopy provides attractive advantages over confocal microscopy for three-dimensionalry resolved fluorescence imaging and photochemistry. The most commonly used type of multi-photon excitation is two-photon excitation where simultaneous absorption of two photons leads to a single quantitized event. The powerful advantages of using two-photon excitation microscopy arise from the basic physical principle that the absorption depends on the square of the excitation intensity. In practice, two-photon excitation is generated by focusing a single pulsed laser through the microscope. As the laser beam is focused, the photons become more crowded, but the only place at which they are crowded enough to generate an appreciable amount of two-photon excitation is at the focus. Above and below the focus, the photon density is not high enough for two of them to interact with a single fluorophore at the same time. This dramatic difference between confocal and two-photon excitation microscopy is shown in Fig. 1.
50
Bastiaens, Koen, Dave C. J. Krop, and Elena A. Lomonova. "Spectral Element-Based Multi-Physical Modeling Framework for Axisymmetric Wireless Power Transfer Systems." Energies 15, no. 9 (April 25, 2022): 3145. http://dx.doi.org/10.3390/en15093145.
Анотація:
This paper concerns a multi-physical modeling framework based on the spectral element method (SEM) for axisymmetric wireless power transfer systems. The modeling framework consists of an electromagnetic and a thermal model. The electromagnetic model allows for eddy currents in source- and non-source regions to be included in the analysis. The SEM is a numerical method, which is particularly advantageous in 2D problems for which the skin-depth is several orders of magnitude smaller compared to the object dimensions and complex geometrical shapes are absent. The SEM applies high-order trial functions to obtain the approximate solution to a boundary-value problem. To that end, the approximation is expressed as an interpolation at a set of nodal points, i.e., the nodal representation. The trial functions are Legendre polynomials, which reduces the complexity of the formulation. Furthermore, numerical integration is performed through Gaussian quadratures. In order to verify the SEM, a benchmark system is modeled using both the SEM and a finite element-based commercial software. The differences in the SEM solutions, i.e., magnetic vector potential and temperature distribution, and the discrepancies in essential post-processing quantities are assessed with respect to the finite element solutions. Additionally, the computational efforts of both methods are evaluated in terms of the sparsity, number of degrees of freedom, and non-zero elements.