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Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b
Maciejewski, G.,Dimitrov, D.,Ferná,ndez, M.,Sota, A.,Nowak, G.,Ohlert, J.,Nikolov, G.,Bukowiecki, Ł.,Hinse, T. C.,Pallé,, E.,Tingley, B.,Kjurkchieva, D.,Lee, J. W.,Lee, C.-U. EDP Sciences 2016 Astronomy and astrophysics Vol.588 No.-
Method of selecting vibro-isolation properties of vibration reduction systems
Igor Maciejewski,Tomasz Krzyzynski 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
An effective optimization method is proposed in this paper to determine the basic characteristics of non-linear visco-elastic elements used in passive vibration reduction systems. The developed method is examined by performing experimental investigations on the exemplary vibration reduction system, i.e., the passive seat suspension. The shaping of vibro-isolation properties is analyzed for different spectral classes of excitation signals.
Igor Maciejewski,Tomasz Krzyzynski 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.11
A generalized model of vibration isolation systems with a human body in a seated position is developed. The system dynamics is modeled for a single-axis transmission of vibration, that is, longitudinal x, lateral y and vertical z, to limit whole-body vibration exposure. The developed model can be successfully employed to describe the propagation of vibration waves from the source to a vibrating object. The proposed mathematical model can be widely used to protect a human body against vibration.
Optimal design of vibration-isolation systems by means of a numerical simulation
Igor Maciejewski,Mariusz Zlobinski,Tomasz Krzyzynski 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.9
In this paper the computational methodology for evaluating vibro-isolation properties of the vibration reduction systems is discussed. The proposed procedure supports selecting the non-linear dynamic behaviour of passive systems and helps to perform the controller synthesis of active systems. Primarily, the mathematical model of a vibration reduction system is developed for the purpose of simulating its dynamic behaviour under different operating conditions. In the next step, the selected vibro-isolation criteria are determined numerically that are related to the opposed requirements of modern vibration reduction systems. Finally, an application of the Pareto-optimal approach is employed to find a trade-off regarding the high efficiency of vibration attenuation at the lowest suspension travel.
Bristle Maps: A Multivariate Abstraction Technique for Geovisualization
SungYe Kim,Maciejewski, R.,Malik, A.,Yun Jang,Ebert, D. S.,Isenberg, T. IEEE 2013 IEEE transactions on visualization and computer gr Vol.19 No.9
<P>We present Bristle Maps, a novel method for the aggregation, abstraction, and stylization of spatiotemporal data that enables multiattribute visualization, exploration, and analysis. This visualization technique supports the display of multidimensional data by providing users with a multiparameter encoding scheme within a single visual encoding paradigm. Given a set of geographically located spatiotemporal events, we approximate the data as a continuous function using kernel density estimation. The density estimation encodes the probability that an event will occur within the space over a given temporal aggregation. These probability values, for one or more set of events, are then encoded into a bristle map. A bristle map consists of a series of straight lines that extend from, and are connected to, linear map elements such as roads, train, subway lines, and so on. These lines vary in length, density, color, orientation, and transparencyâcreating the multivariate attribute encoding scheme where event magnitude, change, and uncertainty can be mapped as various bristle parameters. This approach increases the amount of information displayed in a single plot and allows for unique designs for various information schemes. We show the application of our bristle map encoding scheme using categorical spatiotemporal police reports. Our examples demonstrate the use of our technique for visualizing data magnitude, variable comparisons, and a variety of multivariate attribute combinations. To evaluate the effectiveness of our bristle map, we have conducted quantitative and qualitative evaluations in which we compare our bristle map to conventional geovisualization techniques. Our results show that bristle maps are competitive in completion time and accuracy of tasks with various levels of complexity.</P>
Pietrzyk, Lukasz,Torres, Anna,Maciejewski, Ryszard,Torres, Kamil Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.10
Colorectal cancer (CRC) is a worldwide health problem, being the third most commonly detected cancer in males and the second in females. Rising CRC incidence trends are mainly regarded as a part of the rapid 'Westernization' of life-style and are associated with calorically excessive high-fat/low-fibre diet, consumption of refined products, lack of physical activity, and obesity. Most recent epidemiological and clinical investigations have consistently evidenced a significant relationship between obesity-driven inflammation in particular steps of colorectal cancer development, including initiation, promotion, progression, and metastasis. Inflammation in obesity occurs by several mechanisms. Roles of imbalanced metabolism (MetS), distinct immune cells, cytokines, and other immune mediators have been suggested in the inflammatory processes. Critical mechanisms are accounted to proinflammatory cytokines (e.g. IL-1, IL-6, IL-8) and tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$). These molecules are secreted by macrophages and are considered as major agents in the transition between acute and chronic inflammation and inflammation-related CRC. The second factor promoting the CRC development in obese individuals is altered adipokine concentrations (leptin and adiponectin). The role of leptin and adiponectin in cancer cell proliferation, invasion, and metastasis is attributable to the activation of several signal transduction pathways (JAK/STAT, mitogen-activated protein kinase (MAPK), phosphatidylinositol 3 kinase (PI3K), mTOR, and 5'AMPK signaling pathways) and multiple dysregulation (COX-2 downregulation, mRNA expression).
Dynamic analysis of frames with viscoelastic dampers: a comparison of damper models
Lewandowski, R.,Bartkowiak, A.,Maciejewski, H. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.41 No.1
Frame structures with viscoelastic (VE) dampers mounted on them are considered in this paper. It is the aim of this paper to compare the dynamic characteristics of frame structures with VE dampers when the dampers are modelled by means of different models. The classical rheological models, the model with the fractional order derivative, and the complex modulus model are used. A relatively large structure with VE dampers is considered in order to make the results of comparison more representative. The formulae for dissipation energy are derived. The finite element method is used to derive the equations of motion of the structure with dampers and such equations are written in terms of both physical and state-space variables. The solution to motion equations in the frequency domain is given and the dynamic properties of the structure with VE dampers are determined as a solution to the appropriately defined eigenvalue problem. Several conclusions concerning the applicability of a family of models of VE dampers are formulated on the basis of results of an extensive numerical analysis.
Dynamic analysis of frames with viscoelastic dampers: a comparison of damper models
R. Lewandowski,A. Bartkowiak,H. Maciejewski 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.41 No.1
Frame structures with viscoelastic (VE) dampers mounted on them are considered in this paper. It is the aim of this paper to compare the dynamic characteristics of frame structures with VE dampers when the dampers are modelled by means of different models. The classical rheological models,the model with the fractional order derivative, and the complex modulus model are used. A relatively large structure with VE dampers is considered in order to make the results of comparison more representative. The formulae for dissipation energy are derived. The finite element method is used to derive the equations of motion of the structure with dampers and such equations are written in terms of both physical and state-space variables. The solution to motion equations in the frequency domain is given and the dynamic properties of the structure with VE dampers are determined as a solution to the appropriately defined eigenvalue problem. Several conclusions concerning the applicability of a family of models of VE dampers are formulated on the basis of results of an extensive numerical analysis.