bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of Geometry of Channel on the Flow Noise Parameters
Authors: Gaj Patryk , Kopania Joanna 
Published: August 2020

Abstract
Acoustic emission through duct walls is an important problem in engineering acoustics. This phenomenon most commonly occurs in heating, ventilating and air-conditioning (HVAC) and other gas flow ducting (large industrial silencers). Many works focus on elaboration of more exact description of the acoustic field phenomena reflecting the real conditions in which these appliances operate. As a standard, circle or rectangular ducts are used in ventilation systems. However, technical conditions during the installation of the HVAC system, due to the limitation of the assembly space, require often the use of channels with other geometries. This paper presents aeroacoustical parameters of three most common cross-sectional shapes of air-moving ductwork. The rectangular, square with roundedcorners and circular ducts were studied. The “natural” duct attenuation, which is a consequence of duct shape or noise breakout and involves a diminution of the internally propagated sound power was observed. Natural duct attenuation can be a useful way of reducing sound power levels in long runs of duct.
Efficiency Optimisation of Blade Shape in Steam and ORC Turbines
Authors: Lampart Piotr , Witanowski Łukasz , Klonowicz Piotr 
Published: August 2020

Abstract
This paper is devoted to direct constrained optimisation of blading systems of large power and small power turbines so as to increase their internal efficiency. The optimisation is carried out using hybrid stochastic-deterministic methods such as a combination of a direct search method of Hooke-Jeeves and simulated annealing or a combination of a bat algorithm and simplex method of Nelder-Mead. Among free shape parameters are blade number and stagger angle, stacking blade line parameters and blade section (profile) parameters.
One practical example of efficiency optimisation of turbine blading systems is modification of low load profiles PLK-R2 for high pressure (HP) stages of large power steam turbines. Another optimised geometry is that of an ORC radial-axial cogeneration turbine of 50 kWe. Up to 1% efficiency increase can easily be obtained from optimisation of HP blade profiles, especially by making the rotor blade more aft-loaded and reducing the intensity of endwall flows. Almost 2% efficiency rise was obtained for the optimised 50 kWe ORC turbine due to flow improvement at the suction side of the blade.
Sensitivity of Composite Structure with Directional Properties of Annular Three-Layered Plate Mechanically and Thermally Loaded
Authors: Pawlus Dorota 
Published: August 2020

Abstract
Paper presents the sensitivity of the three-layered plate structure on the acting of mechanical and thermal loads. The cases of the annular plates, whose individual layers: facings and core have homogeneous building and/or heterogeneous one expressed by the variable material properties in radial direction have been examined. Numerical investigations have been carried out modelling the select examples of plate structure with the use of the finite element method. Plate is loaded in the plane of facings or is subjected to the flat temperature field. The evaluation of the structure sensitivity has been carried out analysing the values of critical loads or critical temperatures and corresponding with them buckling modes. Numerous results presented in diagrams create the image of plate behaviours, show responses of plate structure and indicate on the means of structure designs, which can fulfil the expected conditions of plate work.
FSI Computation and Experimental Verification of Fluid Flow in Flexible Tubes
Authors: Šedivý Dominik , Fialová Simona , Klas Roman , Kotek Michal 
Published: August 2020

Abstract
Presented paper is focused on the experimental and computational study of fluid flow in pipes with flexible walls. One possible real example of this phenomenon is the blood flow in arteries or their substitutes in the human body. The artery material itself should be understood as anisotropic and heterogeneous. Therefore, the experiment was carried out on the deforming tube, made of silicone (polydimethylsiloxane - PDMS). Obtained results and observed events were verified by numerical FSI simulations. Due to the large deformations occurring during loading of the tube, it was necessary to work with a dynamic mesh in the CFD part. Based on experimental testing of the tube material, a non-Hookean and Mooney-Rivlin material model were considered. Blood flowing in vessels is a heterogeneous liquid and exhibits non-Newtonian properties. In the real experimental stand has been somewhat simplified. Water, chosen as the liquid, belongs to the Newtonian liquids. The results show mainly comparisons of unsteady velocity profiles between the experiment and the numerical model.
Active Vision Reconstruction Based on Ratio Invariability of Triangle Areas Generated from Triangle Array in Affine Space
Authors: Xu Guan , Shen Hui , Li Xiaotao 
Published: August 2020

Abstract
An active-vision process is presented by the affine invariability of the ratio of triangle areas to reconstruct the 3D object. Firstly, a plate with the triangle array is designed in the same plane of the planar laser. The image of the plate is rectified from the projection space to the affine space by the image of the line at infinity. Then the laser point and the centroids of the triangles constitute a new triangle that bridges the affine space and the original Euclidean space. The object coordinates are solved by the invariant of the triangle area ratio before and after the affine transformation. Finally, the reconstruction accuracy under various measurement conditions is verified by experiments. The influence analyses of the number of line pairs and the accuracy of the extracted point pixels are provided in the experimental results. The average reconstruction errors are 1.54, 1.79, 1.90, and 2.46 mm for the test distance of 550, 600, 650, and 700 mm, which demonstrates the application potential of the approach in the 3D measurement.
Economical evaluation of radiation processing with high-intensity X-rays
Authors: Zimek Zbigniew 
Published: August 2020

Abstract
X-rays application for radiation processing was introduced to the industrial practice, and in some circumstances is found to be more economically competitive, and offer more flexibility than gamma sources. Recent progress in high-power accelerators development gives opportunity to construct and apply reliable high-power electron beam to X-rays converters for the industrial application. The efficiency of the conversion process depends mainly on electron energy and atomic number of the target material, as it was determined in theoretical predictions and confirmed experimentally. However, the lower price of low-energy direct accelerators and their higher electrical efficiency may also have certain influence on process economy. There are number of auxiliary parameters that can effectively change the economical results of the process. The most important ones are as follows: average beam power level, spare part cost, and optimal shape of electron beam and electron beam utilization efficiency. All these parameters and related expenses may affect the unit cost of radiation facility operation and have a significant influence on X-ray process economy. The optimization of X-rays converter construction is also important, but it does not depend on the type of accelerator. The article discusses the economy of radiation processing with high-intensity of X-rays stream emitted by conversion of electron beams accelerated in direct accelerator (electron energy 2.5 MeV) and resonant accelerators (electron energy 5 MeV and 7.5 MeV). The evaluation and comparison of the costs of alternative technical solutions were included to estimate the unit cost of X-rays facility operation for average beam power 100 kW.
Source term estimation for the MARIA research reactor and model of atmospheric dispersion of radionuclides with dry deposition
Authors: Lipka Maciej 
Published: August 2020

Abstract
Source term is the amount of radionuclide activity, measured in becquerels, released to the atmosphere from a nuclear reactor, together with the plume composition, over a specific period. It is the basis of radioprotection-related calculation. Usually, such computations are done using commercial codes; however, they are challenging to be used in the case of the MARIA reactor due to its unique construction. Consequently, there is a need to develop a method that will be able to deliver useful results despite the complicated geometry of the reactor site. Such an approach, based upon the Bateman balance equation, is presented in the article, together with the results of source term calculation for the MARIA reactor. Additionally, atmospheric dispersion of the radionuclides, analysed with the Gauss plume model with dry deposition, is presented.
Cartographic modelling of administrative divisions in the “Historical Atlas of Poland”
Authors: Panecki Tomasz 
Published: August 2020

Abstract
The author’s aim is to reflect on the cartographic modelling of historical borders based on the example of the series “Historical Atlas of Poland. Detailed maps of the 16th century” (HAP). HAP presents secular (state, palatinate, district) and religious borders (dioceses, archdeaconry, deanery, parish). The belonging of historic settlements to administrative units is determined on the basis of written sources. During work on the current volumes of HAP, the borders were reconstructed through their manual interpolation (the so-called linear model). Digital tools enable the automatic generation of administrative units based on settlements in point geometry (Thiessen polygons) or the use of modern divisions (precincts [obręby ewidencyjne]) as a reference to them (semi-automatic method). The article compares and assesses the three mentioned methods of determining historical borders and the possibilities of harmonizing them in relation to contemporary administrative divisions. The source material consisted of 18,357 settlements from the volumes of HAP published so far and 235 parishes for detailed analyses. Precincts were adopted as reference areas due to the possibilities of data harmonization.
Scaling Up Anonymous Communication with Efficient Nanopayment Channels
Authors: Dinh Thien-Nam , Rochet Florentin , Pereira Olivier , Wallach Dan S. 
Published: August 2020

Abstract
Tor, the most widely used and well-studied traffic anonymization network in the world, suffers from limitations in its network diversity and performance. We propose to mitigate both problems simultaneously through the introduction of a premium bandwidth market between clients and relays. To this end, we present moneTor: incentivizing nodes to join and support Tor by giving them anonymous payments from Tor users. Our approach uses efficient cryptographic nanopayments delivered alongside regular Tor traffic. Our approach also gives a degree of centralized control, allowing Tor’s managers to shape the economy created by these payments. In this paper, we present a novel payment algorithm as well as a data-driven simulation and evaluation of its costs and benefits. The results show that moneTor is both feasible and flexible, offering upwards of 100% improvements in differentiated bandwidth for paying users with near-optimal throughput and latency overheads.
Protecting Private Inputs: Bounded Distortion Guarantees With Randomised Approximations
Authors: Ah-Fat Patrick , Huth Michael 
Published: August 2020

Abstract
Computing a function of some private inputs while maintaining the confidentiality of those inputs is an important problem, to which Differential Privacy and Secure Multi-party Computation can offer solutions under specific assumptions. Research in randomised algorithms aims at improving the privacy of such inputs by randomising the output of a computation while ensuring that large distortions of outputs occur with low probability. But use cases such as e-voting or auctions will not tolerate large distortions at all. Thus, we develop a framework for randomising the output of a privacypreserving computation, while guaranteeing that output distortions stay within a specified bound. We analyse the privacy gains of our approach and characterise them more precisely for our notion of sparse functions. We build randomisation algorithms, running in linearithmic time in the number of possible input values, for this class of functions and we prove that the computed randomisations maximise the inputs’ privacy. Experimental work demonstrates significant privacy gains when compared with existing approaches that guarantee distortion bounds, also for non-sparse functions.
SoK: Anatomy of Data Breaches
Authors: Saleem Hamza , Naveed Muhammad 
Published: August 2020

Abstract
We systematize the knowledge on data breaches into concise step-by-step breach workflows and use them to describe the breach methods. We present the most plausible workflows for 10 famous data breaches. We use information from a variety of sources to develop our breach workflows, however, we emphasize that for many data breaches, information about crucial steps was absent. We researched such steps to develop complete breach workflows; as such, our workflows provide descriptions of data breaches that were previously unavailable. For generalizability, we present a general workflow of 50 data breaches from 2015. Based on our data breach analysis, we develop requirements that organizations need to meet to thwart data breaches. We describe what requirements are met by existing security technologies and propose future research directions to thwart data breaches.
In-Depth Evaluation of Redirect Tracking and Link Usage
Authors: Koop Martin , Tews Erik , Katzenbeisser Stefan 
Published: August 2020

Abstract
In today’s web, information gathering on users’ online behavior takes a major role. Advertisers use different tracking techniques that invade users’ privacy by collecting data on their browsing activities and interests. To preventing this threat, various privacy tools are available that try to block third-party elements. However, there exist various tracking techniques that are not covered by those tools, such as redirect link tracking. Here, tracking is hidden in ordinary website links pointing to further content. By clicking those links, or by automatic URL redirects, the user is being redirected through a chain of potential tracking servers not visible to the user. In this scenario, the tracker collects valuable data about the content, topic, or user interests of the website. Additionally, the tracker sets not only thirdparty but also first-party tracking cookies which are far more difficult to block by browser settings and ad-block tools. Since the user is forced to follow the redirect, tracking is inevitable and a chain of (redirect) tracking servers gain more insights in the users’ behavior. In this work we present the first large scale study on the threat of redirect link tracking. By crawling the Alexa top 50k websites and following up to 34 page links, we recorded traces of HTTP requests from 1.2 million individual visits of websites as well as analyzed 108,435 redirect chains originating from links clicked on those websites. We evaluate the derived redirect network on its tracking ability and demonstrate that top trackers are able to identify the user on the most visited websites. We also show that 11.6% of the scanned websites use one of the top 100 redirectors which are able to store nonblocked first-party tracking cookies on users’ machines even when third-party cookies are disabled. Moreover, we present the effect of various browser cookie settings, resulting in a privacy loss even when using third-party blocking tools.
A case of bilateral “double/multiple crush” entrapment syndrome of the upper limbs in a violinist
Authors: Barbu Bogdan Alexandru , Handra Claudia-Mariana , Bădoiu Silviu , Nica Sarah Adriana 
Published: August 2020

Abstract
Entrapment syndromes of the upper limb are common neuro-muscular-skeletal pathology in musician instrumentists. From this group of morbid entities, the most prevalent worldwide is carpal tunnel syndrome closely followed by the cubital tunnel syndrome and de Quervain stenosing tenosynovitis. Due to their distinctive etiopathogenic correlation with exposure to specific occupational factors linked to instrument interpretation and professional environment, these diseases raise a medical challenge and constitute a socioeconomic and professional burden with legal branchings and implications for individuals and society. These syndromes develop isolated or more often in various associations with each other in a clinical pattern that has been described under the model of “double crush” syndrome by Upton and McComas. From its inception in 1973 until the present time, this clinical model has been a point of interesting debate between various specialists worldwide. This model underlines an already lesioned neuron’s susceptibility and vulnerability for further neural damage at a different level from the initial lesion. The sophisticated clinical presentation of this “double or multiple crush” syndrome is due not only to overlapping symptomatology from each contributing neuro-muscular-skeletal pathology or lesional site but also to other local or systemic conditions such as trauma, diabetes, osteoarthritis, thyroid disease, obesity, etc. The occupational factors such as repetitive movements, strain and overload, vibrations, ergonomics, and others all contribute to the creation and progression of the morbid process. We cannot overstate the implications of understanding these complex relations and interdependencies between the factors mentioned above as they are essential not only for the diagnosis of these neuropathies but also for the treatment, rehabilitation, and occupational reinsertion of the patients. The studies support the fact that both lesional sites need to be medically addressed for an optimal outcome and resolution. We present the case of a female violinist with bilateral multiple neuro-muscular-skeletal pathologies of the upper limb treated previously invasively and conservatively over several years by various specialists without a satisfactory clinical resolution of the symptomatology or any professional and legal measures taken.
Amputation, psychological consequences, and quality of life among Romanian patients
Authors: Cotigă Alin Cristinel , Zivari Mirela , Cursaru Adrian , Aliuş Cătălin , Ivan Claudiu 
Published: August 2020

Abstract
Amputation of the limb is a major psychological health issue that was not fully studied. Patients and their families struggle with symptoms of depression, posttraumatic stress disorder, anxiety, phantom limb phenomena, etc. There is also a tremendous impact on the person’s quality of life.
Aim: This study aimed to assess the psychological symptoms of depression, anxiety, and the quality of life among persons suffering from amputation of the limb.
Methods: 31 respondents agreed to participate in the study. They were recruited from the Department of Orthopaedics and Traumatology, University Emergency Hospital, Bucharest, Romania. The medical conditions and the socio-demographic data (i.e., gender, marital status, income, etc.) along with the assessment of the psychological conditions and quality of life were contributions to the statistical analysis of the study.
Results: This study showed that levels of depression are moderate to severe for a significant percent of the population (i.e., a “moderate to severe” or “severe” level of depression was presented by 29% of the patients according to the PHQ-9 test, and 16.1% of the patients according to Beck’s Depression Inventory). Moreover, the levels of anxiety were relatively higher than those of the general population (i.e., severe anxiety was confirmed by the GAD-7 test in the case of 38.7% of the patients) and for most of them the quality of life was impaired.
Discussion: Amputation occurs mainly in adults/elderly aged over 50 years, married, living in urban areas, with different levels of depression and anxiety. At least half of them had a self-perceived health condition that was deteriorated, their physical and role functioning being primarily affected.
Conclusion: There is a need for psychological support of the patients suffering from limb amputation as most of the studies showed high prevalence of depression and anxiety. Socio-demographic factors also represent important elements in defining the quality of life of those patients.
Chloroplast microsatellites reveal genetic diversity and population structure in natural populations of Himalayan Cedar (Cedrus deodara (Roxb.) G. Don) in India
Authors: Ginwal H. S. , Sharma Rajesh , Chauhan Priti , Rai Kirti Chamling , Barthwal Santan 
Published: August 2020

Abstract
Himalayan cedar (Cedrus deodara) is one of the most important temperate timber species of Western Himalayas and is considered to be among the endangered conifer species in the region. Knowledge of genetic diversity and population structure will help guide gene conservation strategies for this species. Ten polymorphic chloroplast microsatellites (cpSSR) were used to study genetic diversity and population structure in twenty one natural populations of C. deodara throughout its entire distribution range in Western Himalayas. When alleles at each of the 10 loci were jointly analysed, 254 different haplotypes were identified among 1050 individuals. The cpSSRs indicate that C. deodara forests maintain a moderately high level of genetic diversity (mean h = 0.79
). AMOVA analysis showed that most of the diversity in C. deodara occurs within populations. Bayesian analysis for population structure (BAPS) revealed spatial structuration of the variation (22 % of the total variation) and substructuring captured nineteen genetic clusters in the entire divisions of the populations. Most of the populations were clustered independently with minor admixtures. The distribution of genetic diversity and sub-structuring of C. deodara may be due to restricted gene flow due to geographic isolation, genetic drift, and natural selection. These findings indicated existence of genetically distinct and different high diversity and low diversity clusters, which are potential groups of populations that require attention for their conservation and management. The results are interpreted in context of future conservation plans for C. deodara.
The School of Salamanca’s Reconciliation of Economics and Religion
Authors: Cesario Anthony J. 
Published: August 2020

Abstract
Many years before Adam Smith, numerous theologians associated with the School of Salamanca, such as Domingo de Soto, Juan de Lugo, Juan de Mariana, Luís Saravia de la Calle, Martin de Azpilcueta, Luis de Molina, Leonard Lessius, Thomas Cajetan, and Francisco Garcia had made great strides in the development of economics. Specifically, these theologians, otherwise known as the “Scholastics,” analyzed and argued against price and wage controls by explaining that the only “just” prices and wages are those that are set by the market, examined and pushed back against prohibitions on usury, understood the concept of time preference, and helped develop monetary theory in multiple ways. They also demonstrated that all of this was consistent with the Catholic religion. This paper analyzes the ways in which these early theologians contributed to the development of economics and reconciled it with their Catholicism.