bluuebunny/crossref_metadata_2025_split huggingface dataset:
A hairpin DGS resonator for application to microstrip lowpass filters
Authors: Chen Rong-Bin , Ou Xiao-Ou 
Published: May 2020

Abstract
A hairpin shaped DGS, consisting of two tilted slots with a separation angle, is studied as a unit cell in this contribution. It is further served as a microwave resonator for microstrip lowpass filter applications. Two prototype filters that respectively cascade the same unit cells and the scaled cells with a different scale ratio are analyzed. For demonstration purposes, the two prototype filters are optimally developed, fabricated and examined both from numerical simulations and from experimental validations. Results show the cascaded scaled type demonstrator features a high stopband suppression level within a wide frequency band.
Mathematical Model of Military Equipment Products Maintenance for the Condition-Based Operation Strategy Taking Into Account Type I Errors
Authors: Mirnenko Volodymyr , Pustovyi Serhii , Radko Oleg , Yablonskyi Petro 
Published: May 2020

Abstract
For military equipment products maintained according to the condition-based operation strategy with control of parameters a mathematical model is constructed using semi-Markov random process. The diffusion-monotonic distribution law which is inherent in mechanical type products is taken for the fault model. The model takes into account type I errors. The analytical dependence of the utilization factor on the parameters of the scale and shape of the diffusion-monotonic distribution, the of regulated maintenance periodicity, the duration of complete restoration of a sample of equipment, the reliability of its control, is established. Graphs of the dependence of the utilization factor on the given parameters of the model are shown.
Methodology for Conducting Preliminary and State Tests of an Aerial Jet Target Set
Authors: Rykaczewski Dariusz , Jastrzębski Grzegorz , Sibilski Krzysztof , Szczepaniak Paweł 
Published: May 2020

Abstract
The article presents a methodology for the implementation of preliminary and state tests on the example of the project entitled “Jet air targets with a programmable flight route” conducted by the Air Force Institute of Technology. The experience in the field of maneuvering aerial targets has allowed for implementation of an aerial jet target set. The further stages of research necessary to implement the set for operation have been presented. Investigations of the aerial jet targets were carried out based on the regulations in force in the Polish Armed Forces.
A New Strategy for Developing of Space Logistics
Authors: Augustyn Sławomir 
Published: May 2020

Abstract
This paper shows a new strategy for developing of space logistics which is supported by safety engineering for the operational techniques and technologies in space. A new strategy is a very important for developing of space technology because account improvement range and its independence from most terrestrial network failures. The developing space logistics is observable during make of satellites which are ensuring wide-ranging continuous information flow among people, businesses and governments for assuring of safety and security when terrestrial network connections are disrupted. The main goal in this publication is presenting example of analysis and assessment in an industrial enterprise of space logistics.
Evaluation of cardiac function in patients with sickle cell disease with left ventricular global longitudinal strain
Authors: Morissens Marielle , Besse-Hammer Tatiana , Azerad Marie-Agnès , Efira Andre , Rodriguez José Castro 
Published: May 2020

Abstract

Background and Objectives
The importance of myocardial dysfunction in sickle cell disease (SCD) is currently debated. It is difficult to find a reliable index of function in patients with chronic overload as in SCD. Speckle tracking echocardiography, a new mean of evaluating cardiac function, might be a useful tool in SCD. It has been applied in many fields to detect early cardiac function deterioration, and it is less load dependent compared with other function parameters. Studies in patients with SCD are rare, and the results are conflicting. The present study aimed to determine whether left ventricular global longitudinal strain (LV-GLS) was abnormal in a population of adults with SCD and whether it was correlated with clinical or biological parameters.

Methods
We prospectively enrolled 37 patients and 34 age- and sex-matched healthy controls. Echocardiography was performed in patients and controls.

Results
We found that the left ventricular diameter and mass were higher and the ejection fraction and longitudinal strain were lower in patients compared with controls. Diastolic dysfunction was uncommon. LV-GLS was abnormal in 21% of the patients. No correlation was observed between strain and clinical or biological parameters.

Conclusions
We concluded that LV-GLS could be a useful tool for evaluating these patients. However, the clinical impact of reduced LV-GLS remains to be determined.
Mechanical and corrosion properties of iron-mangan materials sintered in the presence of plasma
Authors: Orságová Králová Z. , Kupková M. , Hrubovčáková M. , Zeleňák A. , Oriňaková R. , Morovská Turoňová A. , Žáková K. , Kupka M. , Kovaľ K. , Šišoláková I. 
Published: May 2020

Abstract
The current trend in development of new metallic materials for certain types of implants is turning away from permanent, biologically inert materials to the use of biodegradable materials. Fe–Mn alloys represent high perspective material for development of new generation of temporary and biodegradable implants. The aim of this work was to study mechanical and corrosion characteristics of powder samples containing 25, 30 and 35 wt % of Mn which are fabricated by pressing, sintering, and additional spark plasma sintering. The influence of preparation method (pressing and sintering) to microstructure, phased composition and corrosion behavior of prepared alloys was studied.
A statistical approach to estimates of geomorphological-morphotectonic diversity for evaluating the scientific value of geosites: a case study from the southeastern Lut desert, Iran
Authors: Sadeghi-Farshbaf Pouya , Khatib Mohammad Mahdi , Rezaei Naser 
Published: May 2020

Abstract
The present study aims to investigate the diversity index (dv-index) of morphotectonic and geomorphological land-forms as one of the scientific value indices for evaluation of the geotouristic potential of the southeastern Lut desert using topographic statistical analysis. Scientific index scoring in most models is based on descriptive assessment by geotourists and experts. Statistical analysis of the dv-index in the present study helps experts to base their scoring on scientific methods. The dv-index is controlled by several items. In the present study, we analyse two of these, including the classification of topographic continuity pattern (TCP) and topographic slope position correlation (TSPC). For this purpose, a network of section lines is used to analyse slope continuity. The TSPC analysis is performed by using two parameters of absolute value and slope position. Results for these two evaluated items indicate a score of 1.46 (out of 2) for the dv-index. Given a rating of 5, the score obtained for the two items is a high one. Therefore, an initial estimate of the dv-index indicates a significant scientific value of the study area.
Study of Feed Horn Solutions for Irbene RT-32 Radio Telescope
Authors: Bleiders M. 
Published: May 2020

Abstract
Various feasible solutions of Irbene RT-32 secondary focus feed antennas are designed and compared in the present study. The examined feed antennas include smooth wall and corrugated horns with linear and shaped profiles. Mode matching technique is employed for simulation of scattering parameters and radiation patterns. Genetic algorithm is used for optimisation of horn profile for the best cross-polarization, and aperture efficiency performance. Although the presented horns are valid for any frequency band, different solutions allow choosing the best combination of factors, such as electrical parameters, bandwidth, physical size and complexity of manufacturing.
The LOFAR Long-Baseline Calibrator Survey Classification
Authors: Nikolajevs A. , Prūsis K. 
Published: May 2020

Abstract
Data manipulation of the LOFAR Long-Baseline Calibrator Survey (LBCS) and the Westerbork Northern Sky Survey (WENSS) catalogues are carried out in the present study. The aim of the study is to make calibrator classification statistics plots and estimations for further observations and upcoming stations. First, mean flux densities of LBCS calibrators against declination and observed station baseline length to the tied core station are plotted and the classified sources are marked. Second, we provide the designation – naming it the success rate – for the number of sources with the correlated signal against all the LBCS catalogue sources. Third, there is a trend in mean peak flux densities between stations – longer the baseline, higher mean peak flux density. Finally, estimations for upcoming and recent stations are made and some results are not encouraging.
Electrochemical Detection of Small Volumes of Glyphosate with Mass-Produced Non-Modified Gold Chips
Authors: Mizers V. , Gerbreders V. , Sledevskis E. , Kokina I. , Tamanis E. , Krasovska M. , Mihailova I. , Orugcovs A. , Bulanovs A. 
Published: May 2020

Abstract
Mass-produced printed circuit board (PCB) electrodes were used as electrochemical cells to detect the widely-used herbicide glyphosate. Square wave voltammetry (SWV) was used to determine the presence of glyphosate in aqueous Cu(NO3)2 solution. Optimal measurement conditions for the detection of glyphosate with PCB electrodes were found. It was determined that glyphosate was able to soak into the growing plants from the substrate. Glyphosate-contaminated plant juice was distinguished from control samples using the PCB electrode. Glyphosate-contaminated plants were found to have DNA mutations.
The Fabrication of Natural Zeolite Via Co-Precipitation Method as Cu, Pb and Zn Metal Absorbent
Authors: Sirait M. , Saragih K.Sari Dewi , Nurfajriani  , Gea S. 
Published: May 2020

Abstract
Heavy metal waste is very dangerous, which can change the condition of water into a solid substance that can be suspended in water and can reduce the cleanliness level of water consumed by living things. To date, heavy metals can be managed through several processes, namely physics, biology or chemistry. One of the ways to overcome heavy metal pollution is to use natural zeolite applying a co-precipitation method, as it is known that zeolite is a powerful natural material to be used for certain purposes. In order to justify the research results, several analyses have been performed, such as X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Surface Area Analyser (SAA), and Atomic Adsorption Spectrophotometric (AAS). From the XRD results, it has been found out that the size of each zeolite with variations in size of 150 mesh, 200 mesh, and 250 mesh is 29.274 nm, 38.665 nm and 43.863 nm, respectively. Moreover, the SEM-EDX has shown that the zeolite under consideration is a type of Na-Zeolite and that the co-precipitation method successfully removes impurity elements, namely, Fe, Ti, and Cl. The results of SAA testing have indicated that the total surface area for each variation of zeolite sizes is 63.23 m2/g, 45.14 m2/g and 59.76 m2/g. The results of the AAS test analysis have demonstrated that the optimal absorption of metal content is observed in a size of 150 mesh zeolite with adsorption power of 99.6 % for Pb metal, 98 % for Cu metal, and 96 % Zn metal.
A Cross Sectional Survey of Chicken Astroviruses Antibody in Broiler and Sonali (Cross-Bred) Chickens in Selected Areas in Bangladesh
Authors: Ali Md Zulfekar , Moula Mohammad Moktader , Bhuiyan Zafar Ahmed , Javed Muhammad Tariq 
Published: May 2020

Abstract
Chicken astroviruses (CAstV) are enteric viruses of poultry causing gastroenteritis, malabsorption, gout and white chick disease commonly known as runting-stunting syndrome (RSS). It can affect the wide range of poultry birds, especially chicken, turkey and duck worldwide. To our best knowledge there is no published report on presence of antibodies against CAstV in Bangladesh. Therefore, the study aimed to detect the presence of CAstV antibodies in broilers and sonali chickens (a cross-bread) in Bangladesh through a cross-sectional survey. A total of 454 blood samples from 66 flocks of broiler (n=343) and sonali chickens (n=111) of different ages were obtained during 2017 from four districts. The birds were healthy but were not vaccinated against CAstV. The samples were tested for specific antibodies against CAstV Group B by using commercially available ELISA kit. Overall, 16.74% (76/454) samples and 34.84% (23/66) flocks were positive for CAstV antibodies. The seroprevalence of CAstV was significantly (p=0.001) higher in sonali chickens (36.96%) than broiler (10.20%), while it was significantly higher (p=0.001) in birds of Bogura district (36.94%) than the other three districts. Regarding the age groups, seroprevalence was insignificantly (p=0.192) higher in sonali chicken before laying age (45%) than during laying age (27.45%). Regarding the seasons, CAstV infection was prevalent significantly (p=0.001) higher in winter season. Thus, the present study indicated the presence of CAstV in poultry in Bangladesh, so further studies are required to find out the magnitude of the problem in the country.
Job Expectations and Satisfaction Among Scientists
Authors: Feldy Marzena , Bojko Marta 
Published: May 2020

Abstract
The decreasing supply of qualified people ready to take up employment, observed for several years on the labour market, results in the strengthening of the employee’s position. The consequences of this process affect not only the companies but also scientific institutions. The employee’s market, which is shaped as a result of the following changes, forces employers to focus increasingly on activities aimed at attracting and retaining individuals who constitute their human capital. The aim of our article is to diagnose satisfaction levels of various job facets and differences in attachment to the workplace in groups of scientists with varied job expectation profiles. On this basis, it will be possible to indicate the job facets that scientific institutions should take into consideration in order to provide researchers with a high level of job satisfaction. To broaden knowledge about the subject, we used data collected by the National Information Processing Institute in 2017 in a nationwide representative sample of 840 scientists who were at various stages of their academic career, represented all areas of science and worked in all types of scientific units in Poland. By performing factor analysis and a clustering procedure on variables describing researchers’ job expectations we were able to categorize the respondents into three groups: 1) demanding, 2) aspiring and 3) unengaged. The demanding employees have high expectations in all job facets that we examined, i.e.: economic and organizational matters, developmental and social opportunities as well as employment flexibility. The aspiring scientists above all appreciate developmental and social opportunities more than other groups. On the contrary, the unengaged employees value developmental and social opportunities the least while other job facets are moderately significant for them. The survey of satisfaction of particular groups of scientists with their current employer indicates the need to focus the scientific institutions employing them on different aspects of work. In the case of demanding employees, it is important to take care of their economic well-being. On the other hand, in order to increase satisfaction from work of scientists from the aspiring group, it will be important to provide them with a higher level of satisfaction from the development and social sphere. The greatest challenge may be the satisfaction of unengaged employees who declare a relatively low general level of satisfaction with the workplace, and at the same time do not have well-established expectations towards the institutions employing them.
Methods of Measuring the Effects of Public Relations Activities Applied by PR Specialists in their Professional Work
Authors: Szuba Przemysław , Tworzydło Dariusz 
Published: May 2020

Abstract
The purpose of the article is to identify the ways in which Polish PR specialists measured the effects of their own activities in the last year and to analyze the universality of application of specific solutions. A comparative analysis was also conducted based on available research on the tools used by PR consultants. The research was conducted by means of an auditorium questionnaire during the Congress of Public Relations Professionals in 2019. The research sample was comprised of representatives of various organizations operating on the Polish market, 253 respondents in total. Analyses have shown that the use of broadly understood media monitoring is key support for people who build reliable relationships with the environment on a daily basis. It should be noted that the PR industry remains strongly committed to using the AVE indicator, despite the fact that both global and domestic industry organizations are seeking to limit its role in measuring PR effects.
Synthesis of α-Fe2O3 nanoparticles and analyzing the effect of annealing temperature on its properties
Authors: Thimmiah Bhargavi Ram , Nallathambi Gobi 
Published: May 2020

Abstract
α-Fe2O3 nanoparticles were synthesized via co-precipitation technique using ferric and ferrous salts and potassium hydroxide as precipitation agents. The samples were calcined at 350 °C, 550 °C and 750 °C for 3 hours. The obtained iron oxide was characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and dynamic light scattering (DLS). Crystallinity of the sample was studied by X-ray diffraction. SEM micrographs showed nonuniform size distribution of the particles forming agglomerates. TGA analysis revealed trace amount of weight loss and material stability for the samples calcined at temperatures above 500 °C. DLS results indicated that increasing of annealing temperature resulted in reduction of the particle size and more uniform size distribution. At the maximum annealing temperature of 750 °C, the mean diameter of the particles of 100 nm was observed.
Radiation-induced cancer risk and decision-making in a simulated Cs-137 urban event
Authors: Andrade Edson R. , Gomes Renato G. , Stenders Ricardo , Brum Tercio , Lima Sergio X. , Castro Mariana S. C. , Silva Ademir X. 
Published: May 2020

Abstract
The triggering of a “dirty bomb” generates a complex scenario, with enormous challenges for the responders due to initial misinformation and the urgency to act quickly yet effectively. Normally, the first 100 h are decisive for perceiving the risk in a more realistic dimension, but the support of methodologies that rely on computational simulations can be valuable when making key decisions. This work seeks to provide support for the early decision-making process by using a Gaussian model for the distribution of a quantity of Cs-137 spread by a radiological dispersive device (RDD). By sequentially joining two independent programs, HotSpot Health Physics codes and RESidual RADiation (RESRAD)-RDD family of codes, we came up with results that suggest a segmented approach to the potentially affected population. These results advocate that (a) the atmospheric stability conditions represented by the Pasquill–Gifford classes and (b) the population subgroups defined by radiation exposure conditions strongly influence the postdetonation radiological effects. These variables should be taken into account in the elaboration of flexible strategies that include many climatic conditions and to priori-tize attention to different groups of public at risk. During the initial phases of such an event, it is believed that simulations using Gaussian models may be of value in anticipating the possible changes in key variables during the decision-making process. These variables may severely affect the effectiveness of the actions of responders and the general public’s safety.
Effects of coupling agent on antioxidant properties and structure of PP/cotton stalk lignin composites
Authors: He Mingyu , Musajian Dilhumar , Hasan Gvlmira , Hou Gongbo , Yimit Mamatjan 
Published: May 2020

Abstract
In this paper, the effects of coupling agent and lignin extracted from waste cotton stalks in Xinjiang on thermal-oxygen aging properties of polypropylene (PP) composites were studied. The melt index test and indoor thermal oxygen aging test was carried out on the samples treated with coupling agent. The mechanical properties, surface micromorphology, rheological properties and element composition of the materials before and after 30 days of aging were studied. The results showed that the titanate coupling agent was the best for improving the melt index and mechanical properties of PP/cotton stalk lignin composites. After the 30-day thermal oxygen aging test, the samples with 2% lignin had the best impact strength and retention rate of fracture elongation, reaching 68.9% and 77.3% respectively. The sample with 3% lignin content had the smoothen surface, no crack appeared. After aging, the increase of C=O was the least, and the crystal peak area decreased less.
Occupational radiation exposures for medical workers in Pakistan – An overview
Authors: Ahmad Misbah , Ahmad Iftkhar , Khan Aakif Ullah , Khan Amin Ali , Shah Kamran Ali , Ahmad Jamil 
Published: May 2020

Abstract
The imperative use of ionizing radiation in medicine causes the inevitable occupational exposure of the medical workers during the course of routine duties. The magnitude of health risk due to such radiation exposures has been described in terms of occupational radiation doses. In this context, it is obligatory to monitor, measure and document the radiation dose of occupationally exposed medical workers. This study aims to review the whole-body occupational radiation exposures of medical workers in Pakistan. Specifically, online literature published during 2000-2018 was reviewed for the occupational radiation exposures of Pakistani medical workers. Analysis of the extracted personal dosimetry data revealed that the total number of monitored medical occupational workers was 26046. The range of total cumulative and annual average effective doses was 94-15785 Person-mSv and 0.66-7.37 mSv, respectively. A significant number of the workers (25477; ~98%) received an annual dose below 5 mSv, while only 18 workers received an occupational exposure exceeding the annual dose limit of 20 mSv. It is expected that this study will provide a useful reference for evaluating and improving radiation protection and safety policies in the country.