bluuebunny/crossref_metadata_2025 huggingface dataset:
Diurnal feeding strategies of the Ferruginous Duck (Aythya nyroca) in Lake Tonga (Northeastern Algeria)
Authors: Draidi Khalil , Bakhouche Badis , Lahlah Naouel , Djemadi Imed , Bensouilah Mourad
Published: July 2019

Although the Ferruginous Duck (Aythya nyroca) has thoroughly been studied, the foraging behaviour of this species is still not completely known. In the present paper we studied the diurnal feeding behaviour of ducks. We monitored the annual cycle of birds through two fieldtrips per month. The instantaneous behaviour of birds was recorded in regular 30-minute intervals from 7 a.m. to 4:30 p.m., amounting a total of 456 observation hours. Food searching activity corresponds to a quarter of the total diurnal time budget of the Ferruginous Duck. Foraging behaviour was classified into five categories dominated by the “diving”, which is almost 45.61% of the total search time. Foraging activities at the water surface considered to be secondary activities, including feeding by “bill”, “neck and head”, and “beak and head” in a rate of 19.86%, 14.53%, and 13.98%, respectively. The “toggle” remains a minor activity and represents only 5.99% of foraging time. The feeding behaviour of this species correlated to several environmental parameters (rainfall, temperature and wind velocity), and linked to the group size of ducks visiting the lake. Regarding the food intensity, our results show the highest values for “bill and head” behaviour. “Diving” has the longest feeding interval (16.16±14.1 minutes), while foraging by “bill” has the shortest (0.69 ± 0.48 minutes).
Habitat selection of the Common Quail (Coturnix coturnix) in an intensively managed agricultural environment
Authors: Németh Tamás Márton , Kelemen Petra , Csiszár Ágnes , Kovács Gyula , Faragó Sándor , Winkler Dániel
Published: July 2019

This study investigated the habitat selection of the Common Quail (Coturnix coturnix) during the breeding season of 2014 in an intensively managed agricultural environment (LAJTA Project, North-West Hungary). In order to assess the habitat preferences of the Common Quail, habitat composition around occupied plots were compared with unoccupied control plots. To characterize the habitat, a total of 11 variables related to vegetation structure and diversity, food availability and landscape were quantified. Multivariate methods (PCA and GLMs) were used to distinguish the main factors influencing habitat selection and to model the presence of the Common Quail. Based on our results, in the LAJTA Project, high probability of Common Quail presence can be predicted in plots with higher herbaceous cover and more abundant arthropod communities. The network of ecotone habitats, particularly the proximity to woody habitats, also appeared to have significant importance during the breeding season.
Assessment of the breeding and wintering sites of Eurasian Woodcock (Scolopax rusticola) occurring in Hungary based on ringing recovery data
Authors: Schally Gergely
Published: July 2019

Using the latest dataset of the Hungarian Bird Ringing Centre, the aims of this study were to describe the monthly spatial pattern of woodcock occurrence and to assess the main wintering and breeding areas of the birds associated with Hungary in the last decade. Descriptive analyses were performed regarding the annual number of detections (ringing, recaptures and recoveries), and the relation between the annual number of woodcock ringers and the number of ringed birds was tested. Minimum convex polygons (MCP) were calculated for the detections of each month, and the variation of the monthly MCP size was evaluated. Distances of all detection locations were measured from the geographical central point of Hungary, and the distributions of these distances were compared among the months. The annual number of ringed birds increased, however it was not in relation with the number of people involved in ringing. The rate of recoveries was 7.5%. Two types of the reco very circumstances were registered: 89.9% by hunting, 10.1% found dead. MCPs were calculated for eight months. Each MCP overlapped with Hungary, to varying degrees, however remarkable differences were found in the MCP sizes among the different months. The largest areas were covered in December, January and February, while the areas in September and October were less than half of that size. The shortest distances to the country were registered in March, April, October, and November. Moderate distances were recorded in May and September, and the longest distances were found in December, January and February. Large amount of data is available about the wintering areas, and a wide wintering zone can be estimated. In contrast, there is no or only very little information about the areas covered in summer.
Analysis of skull morphometric characters in diurnal raptors (Accipitriformes and Falconiformes)
Authors: Pecsics Tibor , Laczi Miklós , Nagy Gergely , Kondor Tamás , Csörgő Tibor
Published: July 2019

Diurnal birds of prey (Accipitriformes and Falconiformes) has traditionally been known as comprising a single order. Recently, this classification has been used in the non-taxonomic sense as referring to a convergent group of birds that are largely classified as predatory birds. Although these birds are similar in their morphology, the species differ in their foraging methods and prey preference. The cranial shape and the physical attributes determine the efficiency of the resource use. The aim of this study is to increase our knowledge of the relationship between skull shape, prey preference, and foraging habits. A geometric morphometric approach was used to analyse two-dimensional cranial landmarks. We used principal component (PC) analyses on measurements that may be related to prey preference and foraging habits. The PCs are resulted described the relative height of the skull and beak, the variation in the relative size, the orientation and robustness of the lacrimal bone, the variation in the relative size of the neurocranium compared to the viscerocranium, and the orientation of the palatine bone. The dietary categories significantly overlap. The skull morphology reflects more on foraging habits than diet or prey preference.
Pigeons, sandgrouse, cuckoos, nightjars, rollers, bee-eaters, kingfishers and swifts in the European fossil avifauna and their osteological characteristics
Authors: Kessler Jenő Eugen
Published: July 2019

In the article, the author describes the presence of fossil records of the pigeons (Ord. Columbiformes, Fam. Columbidae), sandgrouse (Ord. Pteroclidiformes, Fam. Pteroclididae), cuckoos (Ord. Cuculiformes, Fam. Cuculidae), nightjars (Ord. Caprimulgiformes, Fam. Caprimulgidae), rollers (Ord. Coraciiformes, Fam. Coraciidae), bee-eaters (Ord. Coraciiformes, Fam. Meropidae), (Ord. Coraciiformes, Fam. Upupidae), kingfishers (Ord. Coraciiformes, Fam. Alcedinidae) and swifts (Ord. Apodiformes, Fam. Apodidae) in Europe, particularly the Carpathian Basin, during the Tertiary and Quaternary, as well as their osteological characteristics. These orders generally contain a small number of species in Europe, most of them consisting of thermophilic, migratory species. Their fossil and subfossil remains provide precious information about the climatic conditions of their respective areas of origin.

The text is supplemented by 15 figures and 2 tables.
New species on the list of species with intraspecific nest parasitism
Authors: Haraszthy László
Published: July 2019

Intraspecific nest parasitism has only recently received more attention from ornithologists. In 2001, Yom-Tov published a list of 234 species that had exhibited this behaviour. I have since found literature data on four additional species in which intraspecific nest parasitism has been observed. No such record has so far been published from Hungary. This study presents records on 25 species from Hungary and on one species from Croatia, out of which I have not found any reference for intraspecific nest parasitism in the literature for Cattle Egret (Bubulcus ibis), Eurasian Thick-knee (Burhinus oedicnemus), Black-winged Stilt (Himantopus himantopus), Collared Pratincole (Glareola pratincola), Mediterranean Gull (Larus melanocephalus), Little Tern (Sternula albifrons), Whiskered Tern (Chlidonias hybrida), Eurasian Roller (Coracias garrulus) and Eurasian Jackdaw (Corvus monedula). In addition to records from Hungary, for Black-headed Gull (Larus ridibundus) and Mediterranean Gull I also present observations from Slovakia, and for Common Shelduck (Tadorna tadorna) from Germany.
The effect of urbanization on population densities of forest passerine species in a Central European city
Authors: Kopij Grzegorz
Published: July 2019

Typical, but less common, passerine forest species were selected for this study, such as Lullula arborea, Anthus trivialis, Troglodytes troglodytes, Prunella modularis, Turdus philomelos, Turdus viscivorus, Phylloscopus sibilatrix, Regulus regulus, Regulus ignicapillus, Muscicapa striata, Ficedula albicollis, Ficedula hypoleuca, Parus cristatus, Parus palustris, Parus ater, Certhia familiaris, Certhia brachydactyla, Oriolus oriolus, Garrulus glandarius, and Corvus corax. M. striata and T. philomelos were the most numerous among the 20 investigated species, the former one nested in a density of 6.7 pairs per 100 ha of wooded area, while the later one at 5.1 pairs per 100 ha. Density of most other species was below 3 pairs per 100 ha of wooded area. A. trivialis, P. cristatus and P. modularis were unexpectedly rare (< 1 pair per 100 ha). Otherwise, relatively numerous were T. troglodytes (1.8 p./100 ha), R. regulus (1.8 p./100 ha) and P. palustris (1.4 p./100 ha). P. cristatus, L. arborea, and T. viscivorus were the rarest species investigated (below 0.1 p./100 ha). Several bird species nested in wooded areas only in the outer zone of the city. This group included A. trivialis, R. regulus, P. ater, and C. corax. Population density of T. troglodytes, T. philomelos and O. oriolus were significantly higher in outer than in inner zone, while the reverse was true in the case of M. striata and F. hypoleuca.
Preliminary results on bird collision with overhead power lines in Hungary: a case study around Pusztaszer Landscape Protection Area
Authors: Pigniczki Csaba , Bakró-Nagy Zsolt , Bakacsi Gábor , Barkóczi Csaba , Nagy Tamás , Puskás József , Enyedi Róbert
Published: July 2019

The literature on bird collision with power lines in Hungary is rather limited. We collected published records and carried out research on birds that collided with overhead wires, and we made a list of species, and the number of individuals recorded, around Pusztaszer Landscape Protection Area. The quality of data did not allow us to do robust statistical tests, and a large amount of collected data was not used in this paper, because of uncertainty. Finally, we used the records of 519 individuals of 63 species that got injured or died during collision with overhead wires. We found evidence, that low-, middle- and high-voltage power lines were all responsible for the collision accidents of birds. Birds that use wetlands or both wetlands and farmlands are the most threatened to collide with overhead electric wires. Most victims of collision accidents belong to Gruiformes, Charadriiformes, Pelecaniformes and Anseriformes orders. Our preliminary results suggest that the bigger the rate of weight and wingspan (wing-loading proxy) is, the greater the risk of birds colliding with power lines, probably because of poor manoeuvrability. Birds that move regularly, on a daily basis between their nests/roost sites and foraging areas are at higher risk to collide with electric wires. Our preliminary results do not support the hypothesis that birds which sit on power lines collide more frequently than birds that do not use wires. It seems that foggy weather circumstances increase the probability of collision events particularly in case of Common Cranes. Some large birds were found with burnt feathers after collision with middle-voltage power lines. A sizeable part of collided birds were protected or strictly protected. Bird collision with overhead wires is a serious problem in Hungary. Collision can be stopped on most dangerous part of overhead wires by converting to underground cabling. It is possible to reduce the number of collision events in case of high-voltage power lines by increasing their visibility. We always recommend underground cabling in case of wetlands, if new segments of electric wires would be carried out.
“Carte-á-figure” maps of Poland: dates, states, and provenances
Authors: Paprotny Zbigniew
Published: July 2019

After short introduction to carte-á-figure genre of maps discussed are three maps of Poland belonging to this category: the first state of Hondius’ Nova POLONIAE delineatio”, Visscher’s “Haec Tabula nova POLONIAE et SILESIAE, and Speed’s A NEWE MAPE OF POLAND. For the origin of the Hondius’ map a more precise range of dates is proposed. Question of the Visscher map’s order of states is clarified, supported by evidence from the author’s research. Finally, line of reasoning is presented and arguments quoted disproving widely held belief in priority of the Speed’s map over the Visscher’s. Also, dissimilarities between images of Silesia on Hondius’ and Visscher’s maps together with possible reasons of these are considered.
Emergency Cases at Countering Improvised Explosive Devices (C-IED), and their Potential Management
Authors: Horváth Tibor
Published: July 2019

During the military operations in Iraq and later in Afghanistan, the capability of force protection, of providing defence against improvised explosive devices (IEDs), and the organization of training courses aimed at enhancing the knowledge of personnel became increasingly important. Previous analyses clearly pointed out that the largest number of military and civil casualties were claimed by such devices.
Optimization of the Lessons Learned Process in the Czech Armed Forces
Authors: Kosecová Janka , Kašpárková Kateřina
Published: July 2019

Lessons learned process enables an organization to learn from its mistakes and successes. Thanks to this process an organization can reduce the risk of repeating mistakes and increase the chance that successes are repeated. This article aims to present the results of the research, especially, results of the process analysis of sharing lessons in the Czech Armed Forces. Based on the procedural deficiencies identification, benchmarking comparisons with lessons learned process of other organizations were carried out. The purpose of the benchmarking was to do away with the above mentioned deficiencies. To use benchmarking was beneficial from the point of view of a simplified model processing. The final part of the article introduces set of recommendation including the optimized model of the lessons learned process.
The Intercultural Competence of Military Students in the Context of International Mobility
Authors: Matei Florentina-Lavinia
Published: July 2019

This study aims to evaluate intercultural competence for military students before they go on an international mobility stage and after its completion, in order to see if intercultural competence is formed in real intercultural contexts. In the study, we addressed both theoretical and practical aspects of intercultural competence. As an instrument for data collection, an intercultural competency assessment questionnaire was used and, following its application, it was found that the high level of the “knowledge” component of intercultural competence determines a higher level of the other two elements - “attitudes” and “skills”.
Methodological Guidelines on the Learning and Perfecting of Self-Defense Techniques in the Fighters’ Training
Authors: Stănciulescu Robert , Beldiman Elvira
Published: July 2019

In terms of forming and training the fighters, the modern armies have delineated well-defined instructive horizons, the development of the physical potential, characterized by the increase of the parameters of manifestation of the basic motor qualities as well as of the motor skills and applicative skills specific to carrying out the combat actions being very well harmonized with the development of intellectual, psychological, moral and specialist competencies. The maximization of the capacity of effort to meet the intensive and long-lasting demands as well as the improvement of the fighting skills specific to the modern combat area represent a permanent concern of the specialists in the field, who amplify the training process in an activity based on the most complex and efficient training techniques. The paper presents the techniques, methods and means for optimizing the training in the self-defense combat, in order to ensure a rich bag of scientific information necessary in accomplishing the objectives for the training of the fighters.
Perception of the Z Generation Regarding the Promotion Way of Romanian Army Institution
Authors: Ripiceanu Robert Georgian
Published: July 2019

This article approaches the attitude of Z Generation concerning the promoting of the Romanian Army Institution in social media. This domain is a rigorous one, based on serosity and there are not a multitude of common values with this generation. Technology is a world-known aspect and the IGeneration is known as being born with new technological culture and they do not require to adjust to it. They prefer socializing in online, capture some meaningful general knowledge from their intercommunications. The Internet proposes various techniques of enticing youngsters to consume a lot of time online, on their smart devices.
Functions of Logistics Support Management for Military Activities During Peace
Authors: Pînzariu Sorin , Mînea Costel-Dorel
Published: July 2019

The functions of logistics management for military activities during the peacetime are determinant for the realistic forecasts, computation, estimates, the opportunity of good decisions, the reliability and logical achieving of suitable logistics support for specific military activities and military exercises. Uniformly application of these functions, lead to timely necessary corrections in order to achieve the desired goals of logistics support for military activities on peacetime. Also, through the use of logistics management functions, we evaluate the results by comparing it in a matrix what we intended to achieve and was the final accomplishment. According to this matrix we can conclude positive and negative elements that influence the logistic support.
Path Attenuation Calculator for Rain Fade
Authors: Abdulhamid Mohanad , Wekesa Waswa
Published: July 2019

Rain as a weather phenomenon is one of the things that greatly affects propagation of radio waves. Above 10 GHz, the attenuation brought about by the interaction of the propagating waves and the rain droplets becomes significant for both terrestrial radio links and satellite links. For this reason, rain attenuation models have been developed to aid in planning purposes for network implementation. The models use statistics to predict the attenuation that is caused by specific amount of rain and also the type of rain. This means that different regions will have different levels of attenuation due to the fact that they experience different types and amount of rain. A couple of models exist including the ITU-R, Moupfouma model, Crane attenuation model and other localized models depending on the geographical area that research data collection and extensive analysis has been conducted on and a comprehensive set of values and factors have been determined that can aid in estimation of attenuation due to rain. This paper seeks to provide a viable means by which a transmission engineer can be able to know the attenuation per kilometer due to the various models. This is achieved by designing a software calculator that provides the output of the attenuation per kilometer (dB/Km) while taking an input of rain rate for the different models available. The calculator is based on visual basic platform and works with forms.
Solar Energy Conversion Using Low Cost Inverter
Authors: Al-Rawi Muhanned
Published: July 2019

This paper focuses on designing and implementing of an inverter and particularly focuses on developing a low cost transformer-less voltage source conversion that has a higher efficiency as well as compact in size. The complete design consists of DC-DC converter and a DC-AC inverter. The converter is dependent on switched capacitor techniques and steps 12Vdc to 240Vdc. The inverter is dependent on a full-bridge configuration which produces a 240Vac output from 240Vdc. To achieve the improvement in inverter efficiency and a reduction in cost, the power transformer and magnetic components such as inductors are eliminated. In addition, inverter voltage control techniques such as pulse width modulation (PWM) and switching of MOSFETs are optimized through digital control using ATtiny26L microcontroller unit.
Study of Parallel Algorithms for IP Switches
Authors: Farhan Mhnd
Published: July 2019

Owing to the increase in the internet traffic, any calculation that requires more than linear time would be considered unreasonably moderate for constant applications. One cure is to utilize numerous processors to build up associations in parallel and the other is to construct low cost, high speed, large capacity non-blocking switching architecture. In this paper, our focus is on developing parallel algorithms for routing which will ensure high-speed internet connectivity and at the same time making the system to be cost effective.
Analisys of Access Points with the Queue Model for Biometric Access Control in Large Headcount Plants
Authors: Otti Csaba , Hanka László
Published: July 2019

The scaling of access control systems is usually done with respect to the life protection requirements regarding escape routes. At large headcount areas, the need for biometric identification arises from the security and business needs. Biometric systems can be characterized by probability variables, which can significantly affect the access process. Mathematically, access control is a discrete state space, stochastic process without memory, that can be described by a queue model. This study demonstrates the process model of access control systems and describes the mathematical model that allows for accurate planning and can ensure a successful introduction for access control systems.
New Aspects Concerning Dynamics of Rigid Solid Body in Plane-Parallel Motion Subjected to Real Constraints. Part One
Authors: Tătaru Vladimir Dragoş , Tătaru Mircea Bogdan
Published: July 2019

The present paper approaches in an original manner the dynamic analysis of a wheel which climbs on an inclined plane under the action of a horizontal force. The wheel rolls and slides in the same time. The two movements, rolling and sliding are considered to be independent of each other. Therefore we are dealing with a solid rigid body with two degrees of freedom. The difficulty of approaching the problem lies in the fact that in the differential equations describing the motion of the solid rigid body are also present the constraint forces and these are unknown. For this reason they must be eliminated from the differential equations of motion. The paper presents as well an original method of the constraint forces elimination.
Do Return Migration Policies Matter? A typology of young Romanian returnees’ attitudes towards return policies
Authors: Șerban Monica , Croitoru Alin
Published: July 2019

During the last decades, the interest in migration policies has increased, both at institutional level and in academia. However, if the scientific understanding of policies associated with migration at destination has tremendously advanced, our knowledge about origin countries interventions in migration stays limited. Our paper addresses one of the largely unexplored topic of this area: if and what kind of policies supporting return/returnees the returnees themselves find appropriate. The analysis is based on 120 interviews with Romanian returnees, aged 18 to 39, coming back after at least 6 months of working or studying abroad in different EU countries. The article reveals that even if the return policies are generally positively evaluated by the Romanian returned migrants, not all of them support the idea of having policies specially designed for attracting migrants back to the origin country. Some of them simply reject the idea and others are sceptical about the state capacity of implementing this type of policies. The paper explores all the main clusters of attitudes towards return migration policies and illustrates each of them with excerpts from in-depth interviews.
Technical Aspects of Using the Heat Pump at the Ship
Authors: Trzebiński Sylwester
Published: July 2019

The paper attempts to analyze the technical possibilities of using a compressor heat pump to recover waste heat from energy processes implemented by a watercraft. The amount of waste heat that could be used for the heating needs of the vessel was estimated and the hydrothermal potential of the marine waters was assessed. The possibilities of reducing the power of the ship's power plant used to power the ship's heating installation were determined.
Using Gamification and Fear Appeal Instead of Password Strength Meters to Increase Password Entropy
Authors: Rodwald Przemysław
Published: July 2019

It is very common for users to create weak passwords. Currently, the majority of websites deploy password strength meters to provide timely feedback. These meters are in wide use and their effects on the security of passwords have been relatively well studied. In this paper another type of feedback is studied: a gamified approach supported by fear appeal. In this approach, users are encouraged to make passwords stronger through the use of visual and textual stories. This approach is supported by data-driven suggestions about how to improve password security as well as by fear appeal. To prove the effectiveness of this gamified password creation process, an experiment was performed in which users changed their passwords in two ways: without any feed-back, and with gamified feedback with fear appeal. To support the initial findings a questionnaire was completed by participants at the end of research.
Exponential Sequence in the Operational Calculus Model for the n
TH-Order Forward Difference
Authors: Wysocki Hubert
Published: July 2019

In the paper, there has been determined an exponential element in the discrete model of the non-classical Bittner operational calculus for the n
th-order forward difference.
Polish Navy Shipbuilding Regulations — Example of Neglect and Lack of Awareness. Polemical Sketch
Authors: Kalinowski Arkadiusz
Published: July 2019

The paper presents a formal and legal status within the scope of design, construction and equipping the Polish Navy ships. Regulations in force in the Ministry of National Defence are not complete and have a significant impact on the possibilities and limited efficiency of building new ships.

The article presents an attempt to systematise issues in terms of the construction of new ships for the Polish Navy. Fundamental attention was focused on identification of existing gaps in the regulations, as well as presenting proposals to eliminate them.
Changes in the Logistics System of the Polish Navy
Authors: Jankowski Mariusz
Published: July 2019

The aim of the article is to show the changes taking place in the structures of logistical support of the Polish Navy, focusing on the changes in the way of supplying ships of the Polish Navy. In recent years, the Polish Navy has undergone many changes in the subject matter, starting from the liquidation of the Logistics of the Polish Navy and the Polish Navy Command, including the Management of Logistics Planning. The changes contributed to the centralization of Logistics, creating the Inspectorate for Armed Forces Support of the Republic of Poland, which focused on the main burden of tasks related to, among others, repairs, modernization and supply of ships. On the other hand, it extends the time of issuing opinions on, for example, the protocols for assessing the technical condition of military equipment (ME), which are the basis for the replacement, repair or further exploitation of the ME.
Text Spotting in the Wild with Embedded Device
Authors: Zacniewski Artur , Bodnar Tadeusz
Published: July 2019

Detecting and recognizing text in natural scenes (e.g. streets, restaurants, shops, etc.) could be a part of an artificial intelligence system, especially with regard to the speech synthesis system. Properly detected text is passed to a recognition stage and then to the speech synthesis system, which translates text to speech. Research is carried out for the ‘Toucan Eye’ project — embedded device with artificial intelligence system able to help people with impaired sight. Due to constrained resources and abilities of embedded devices, criteria for text spotting must be met. First criterion is quality of detected and recognized regions with text and the second is time spent on both operations. Particular stages of the system and chosen methods of text spotting under aforementioned constraints are presented.
Green Propulsion Research at TNO the Netherlands
Authors: Mayer Alfons , Wieling Wolter
Published: July 2019

This paper describes the recent theoretical and experimental research by the Netherlands Organisation for Applied Scientific Research (TNO) into green replacements for hydrazine, hydrazine derivatives and nitrogen tetroxide, as propellants for in-space propulsion. The goal of the study was to identify propellants that are capable of outperforming the current propellants for space propulsion and are significantly less hazardous for humans and the environment. Two types of propellants were investigated, being monopropellants and bipropellants. The first section of the paper discusses the propellant selection. Nitromethane was found to be the most promising monopropellant. As bipropellant, a combination of hydrogen peroxide (HP) and ethanol was selected, where the ethanol is rendered hypergolic with hydrogen peroxide. The second part of the paper describes the experimental verification of these propellants by means of engine testing. Initiation of the decomposition of nitromethane was found to be problematic, hypergolic ignition of the hydrogen peroxide and ethanol bipropellant however was successfully demonstrated.
Electricity Storage in Energy Clusters
Authors: Kunikowski Grzegorz
Published: July 2019

The article aims to present the results of analysis and evaluation of using energy clusters as a bulk electricity storage. There were developed an analytical model of a sample microgrid (on-grid) and analysed using a software dedicated for optimizing such microgrids. The model of microgrid consist on electricity commercial and residential loads, photovoltaic and wind installations and batteries.
Increasingly Safe, High-Energy Propulsion System for Nano-Satellites
Authors: Sabadosh Lyubomyr , Larkov Serhii , Kravchenko Oleg , Sereda Vladyslav
Published: July 2019

Numerous attempts have been undertaken to develop propulsion systems for nano-satellite-type spacecrafts to enable their maneuvering in orbits. One of the potentially viable chemical propellant propulsion systems is a hybrid system. The present paper studies propellant composition variants with the metal hydride as fuel that can be chosen for a nano-satellite hybrid propulsion system. It defines key requirements for chemical propellant nano-satellite propulsion systems, and specifies potential propellant pairs based on a compact metal hydride. The study describes basic technical characteristics of a 1U CubeSat propulsion system.
Propulsion System Modelling for Multi-Satellite Missions Performed by Nanosatellites
Authors: Sochacki Mateusz , Narkiewicz Janusz
Published: July 2019

Progress in miniaturization of satellite components allows complex missions to be performed by small spacecraft. Growing interest in the small satellite sector has led to development of standards such as CubeSat, contributing to lower costs of satellite development and increasing their service competitiveness. Small satellites are seen now as a prospective replacement for conventional sized satellites in the future, providing also services for demanding users. New paradigms of multi-satellite missions such as fractionation and federalization also open up new prospects for applications of small platforms.

To perform a comprehensive simulation and analysis of future nanosatellite missions, an adequate propulsion system model must be used. Such model should account for propulsion solutions which can be implemented on nanosatellites and used in multi-satellite missions.

In the paper, concepts of distributed satellite systems (constellations, formations, fractionated and federated) are described with a survey of past, on-going and planned multi-satellite nanosatellites missions. Currently developed propulsion systems are discussed and the models of propulsion systems embedded in the WUT satellite simulation model are presented.
Development and Testing of Data Reduction Software for Measurements Using Pressure Sensitive Paints
Authors: Deitrick William J. , Stryczniewicz Wit
Published: July 2019

The paper concentrates on post-processing of data necessary for pressure measurements using Pressure Sensitive Paints (PSP). The purpose of the study was to develop and test procedures for extraction of the surface pressure distribution from the images captured during PSP tests. The core issues addressed were reduction of the influence of model movement and deformation during wind tunnel run and synchronization between conventional pressure tap measurements and PSP data, necessary for in-situ calibration. In the course of the studies, two approaches on image registration were proposed: the first based on geometric transformation of control points pairs with cross-correlation tuning and the second based on similarity finding and estimation of geometric transformation of the images. Performance of the developed algorithm was tested with use of experimental set-up allowing for controlled movement of the imagined target with micrometer resolution. Both of the proposed approaches to PSP image resection proved to perform well. After testing of the software, the PSP system was used for determination of the pressure field on flat plate exposed to impinging jet. The presented procedures and results can be useful for research groups developing in-house PSP measurements systems for wind tunnel tests and internal flow investigations.
Evaluasi Tugas dan Kompetensi Kader Posyandu Balita di Kelurahan Jawa Kota Samarinda
Authors: Nuryanti Aprilia , Ermayani Made
Published: July 2019

Jumlah balita (0-4 tahun) pada tahun 2015 di Kota Samarinda adalah jumlah kelompok umur tertinggi kedua setelah usia 25-29 tahun. Pemerintah menyelenggarakan program kesehatan anak melalui Puskesmas. Puskesmas memiliki wilayah binaan kesehatan anak berupa Posyandu Balita. Puskesmas memiliki kader-kader kesehatan anak di masing-masing Pada pelaksanaannya di lapangan tugas kader tidak optimal dan menemukan beberapa kendala. Kendala yang terjadi mungkin dapat menyebabkan pencapaian program yang diharapkan oleh Puskesmas dan pemerintah kurang optimal. Oleh sebab itu, perlu penelusuran evaluasi tugas kader kesehatan anak dalam melaksanakan program kesehatan anak melalui puskesmas sebagai tangan panjang pemerintah. Evaluasi bermanfaat untuk mengembangkan pelatihan dan penyuluhan yang diperlukan bagi para kader untuk meningkatkan kompetensi mereka. Diskusi kelompok terarah dengan kader adalah salah satu upaya menelusuri dan mengevaluasi pelaksanaan tugas yang telah dilakukan kader kesehatan anak serta menemukan kendala-kendala teknis selama melaksanakan tugasnya. Hasil diskusi dianalisis dan ditarik tema-tema yang menjadi isu strategis evaluasi tugas kader kesehatan anak. FGD diikuti oleh 16 partisipan dan dua orang Pembina dari Puskesmas. Hasil FGD menunjukkan bahwa pelaksanaan tugas administrasi kader dapat dilakukan dengan baik, pelaporan dan sosialisasi program dari Pemerintah disampaikan kepada kader melalui pertemuan di Puskesmas. Kendala yang terjadi selama kader bertugas di Posyandu adalah keterbatasan jumlah kader karena ada kader kesehatan anak yang merangkap sebagai kader kesehatan lansia. Karena jumlah yang kurang maka tugas dua meja harus dilakukan oleh seorang kader sehingga ada penugasan yang dobel. Kader mengatakan masalah di lapangan lainnya adalah kurangnya kepercayaan orang tua kepada kader karena keterbatasan kader dalam pengetahuan gangguan tumbuh kembang anak dan kurang terbukanya/ penolakan orang tua untuk membawa anak ke Posyandu. Saran yang dapat dilakukan oleh Puskesmas adalah mengevaluasi pencapaian pengetahuan dan keterampilan kader, pendampingan dalam kunjungan ke rumah warga yang bermasalah dan mengambangkan topik penyuluhan bagi kader dengan bekerja sama dengan instansi pendidikan tinggi kesehatan. Bagi institusi pendidikan agar dapat melaksanakan penyuluhan dan pelatihan bagi kader dengan bersinergi dengan Puskesmas dalam pemilihan topik.
Penguatan Daya Tahan Ekonomi Rumah Tangga Pelaku Industri Batubata Rakyat Melalui Usaha Budidaya Jamur Tiram
Authors: Novra Ardi , Andayani Jul , Sulaksana Indra
Published: July 2019

Permasalahan utama yang dihadapi rumah tangga pelaku industri kecil dan menengah (IKM) batubata pada umumnya adalah frekuensi penerimaan yang tidak stabil dan cenderung dengan frekuensi waktu cukup panjang. Proses produksi batubata mulai dari penggalian tanah sampai siap jual membutuhkan waktu relatif cukup lama dan bahkan bulanan. Tujuan utama kegiatan adalah memperkuat daya tahan ekonomi rumah tangga pelaku IKM Batubata melalui diversifikasi usaha budidaya Jamur Tiram. Kegiatan menggunakan Pendekatan Partisipatif (Participatory Rural Appraisal) dengan Sistem Modal Bergulir Internal (Internal Revolving Capital System). Program penguatan daya tahan ekonomi rumah tangga pelaku IKM Batubata ini masih pada tahap pengenalan sehingga ruang lingkup kegiatan untuk sementara masih terbatas aspek budidaya. Pengembangan lanjutan pada masa akan datang akan mengarah ke sektor hulu (pembuatan baglot sebagai input primer dan sektor hilir berupa industri pengolahan hasil pasca panen. Program lanjutan pada masing-masing kelompok sasaran akan menggunakan sumberdana lain dan sangat tergantung pada motivasi dan keberhasilan program budidaya jamur tiram. Pelaksanaan kegiatan dilakukan melalui 4 (empat) tahapan yaitu tahapan persiapan, budidaya dan perguliran modal kelompok serta pelaporan. Berdasarkan evaluasi terhadap hasil kegiatan dengan berbagai kendala teknis dan non-teknis yang dihadapi selama proses pelaksanaan, maka dapat disimpulkan bahwa program pengabdian kepada masyarakat ini belum memberikan hasil optimal bagi penguatan ekonomi rumah tangga dan usaha kelompok pengrajin batubata rakyat. Meskipun demikian, model pengembangan kumbung diatas kolam bekas galian (KBG) telah mampu menarik motivasi rumah tangga untuk memanfaatkan KBG mereka. Program ini telah menjadi embryo dan layak untuk ditindaklanjuti melalui program lainnya baik dalam bentuk riset (peneltiian) maupun pemberdayaan masyarakat.
Penerapan Metode Pengelasan Stainless Steel pada Bengkel Las di Kota Palembang
Authors: Rasid Muhammad , Mardiana Mardiana , Choiruddin Choiruddin
Published: July 2019

Memasuki era globalisasi tingkat persaingan menjadi semakin tinggi, perdagangan bebas memungkinkan mengalirnya barang dan jasa antar negara tanpa adanya hambatan yang berarti, kondisi ini tentu menuntut kesiapan dan ketangguhan dari setiap pelaku usaha mikro bila tidak ingin tersingkir dari pasar dunia. Kualitas, jenis produk yang dihasilkan berbeda-beda untuk setiap bengkel las. Untuk tumbuh kembangnya suatu bengkel las dibutuhkan sentuhan IPTEK sehingga dapat bersaing dengan bengkel/Perusahaan yang lebih besar yang kuat teknologi dan modal. Dengan menggunakan peralatan yang masih konvensional seperti mesin las listrik (SMAW Welding), mesin bor bangku, gerinda tangan, bor tangan, ragum, kikir dll, usaha bengkel las mikro sulit untuk berkembang dan bersaing dengan bengkel-bengkel las besar yang ada. Salah satu produk yang mempunyai pangsa pasar yang sangat potensial yaitu pembuatan pagar, teralis dan perlengkapan rumah tangga, kanopi dll. dengan menggunakan material dari bahan stainless steel yang mempunyai tampilan lebih menarik dan lebih tahan terhadap korosi. Untuk mendapatkan pangsa pasar yang besar tersebut dibutuhkan IPTEK dan sarana prasarana yang memadai. Penguasaan teknologi dan informasi akan menjadi suatu keharusan dalam dunia usaha. Pengembangan usaha mikro dengan cara memberi dukungan positif dan nyata terhadap pengembangan sumber daya manusia (pelatihan kewirausahaan), teknologi, informasi, akses pendanaan serta pemasaran. Peluang usaha bisnis bengkel las mempunyai prospek yang besar.untuk itulah penulis mencoba untuk memecahkan permasalahan yang ada khususnya pada kedua mitra IbM yang bergerak dalam bidang manufaktur bengkel las yang berada di kota Palembang, yaitu Bengkel Las Penukal Jaya dan Bengkel Las Pali. Tujuan yang ingin dicapai dalam program IbM ini yaitu dengan meningkatkan kemampuan (skill) Sumber Daya Manusia dari kedua mitra dengan membekali mereka dengan kemampuan mengelas untuk material stainless steel (Pengelasan TIG), membekali mereka dengan sistem manajemen keuangan dan melatih dalam membuat proposal untuk mendapatkan hibah/bantuan lunak. Manfaat kegiatan IbM ini sangat dirasakan positif oleh kedua mitra sehingga dari hasil pendampingan kami dapat simpulkan kedua mitra telah dapat menggunakan sistem manajemen yang kita terapkan dan telah terjadi transper teknologi khususnya dibidang pengelasan Las TIG, sehingga dapat meningkatkan penghasilan kedua mitra. Kata kunci :  SMAW Welding, Stainless  Steel
Evaluasi Daun Kelor (Moringa oleifora) Sebagai Pangan Fungsional
Authors: Purwati Purwati
Published: July 2019

Daun kelor memiliki banyak manfaat untuk kesehatan dan memiliki nilai ekonomis yang tinggi jika diolah sebagai pangan fungsional. Daun kelor mengandung senyawa yang berfungsi sebagai antioksidan alami sehingga dapat dimanfaatkan sebagai pangan fungsional. Masyarakat yang mengkonsumsi pangan fungsional berbahan baku daun kelor akan mendapatkan manfaat ganda yaitu terpenuhinya gizi bagi tubuh dan dapat mencegah berbagai macam penyakit. Mengingat masyarakat belum banyak mengetahui cara pengolahan daun kelor sebagai pangan fungsional maka perlu dilakukan kegiatan penyuluhan yang bertujuan agar masyarakat memiliki wawasan untuk mengembangkan usaha berbasis bahan baku daun kelor pada skala rumah tangga. Hal ini dapat meningkatkan kebutuhan gizi dan pendapatan keluarga. Hasil kegiatan penyuluhan ini menunjukkan bahwa pengetahuan masyarakat makin meningkat khususnya pengolahan pangan fungsional berbahan baku daun kelor.
Penyuluhan Kosmetika Aman dan Identifikasi Merkuri dalam Kosmetika
Authors: Supriningrum Risa , Jubaidah Siti
Published: July 2019

Kosmetik merupakan hal penting dalam kehidupan manusia saat ini, karena kosmetik sudah merupakan kebutuhan dan gaya hidup bagi wanita maupun pria, disegala usia. Banyaknya produk kosmetik yang beredar di pasaran dan ditawarkan di berbagai media, mengharuskan masyarakat berhati-hati dalam menentukan produk kosmetik yang akan digunakan. Generasi milenial merupakan usia produktif  banyak menggunakan kosmetika.  Tujuan pengabdian masyarakat ini adalah memberikan informasi tentang kosmetika aman dan memberikan pelatihan cara mengidentifikasi merkuri dalam kosmetika .Metode yang digunakan pada pengabdian masyarakat ini adalah penyuluhan yaitu memberikan informasi tentang pengertian, fungsi kosmetika, bahan yang dilarang dan bahan berbahaya yang sering digunakan dalam kosmetika. Selain penyuluhan, siswa diberikan pelatihan tentang langkah cerdas memilih kosmetika dengan melakukan cek Klik , mengidentifikasi sediaan kosmetika secara visual dan mengidentifikasi merkuri dalam kosmetika. Selanjutnya siswa diberikan kuisioner yang dimaksudkan untuk mengetahui pemahaman siswa setelah diberi penyuluhandan pelatihan. Kegiatan dilakukan di Sekolah Menengah Atas Negeri 3 Samarinda. Hasil kuisioner menunjukkan bahwa 98 persen siswa telah memahami bagaimana memilih kosmetika yang aman dan dapat mengidentifiasi kosmetika secara visual dan kosmetika yang mengandung merkuri.
Flexible Representative Democracy: An Introduction with Binary Issues
Authors: Abramowitz Ben , Mattei Nicholas
Published: July 2019

We introduce Flexible Representative Democracy (FRD), a novel hybrid of Representative Democracy (RD) and Direct Democracy (DD), in which voters can alter the issue-dependent weights of a set of elected representatives. In line with the literature on Interactive Democracy, our model allows the voters to actively determine the degree to which the system is direct versus representative. However, unlike Liquid Democracy, FRD uses strictly non-transitive delegations, making delegation cycles impossible, preserving privacy and anonymity, and maintaining a fixed set of accountable elected representatives. We present FRD and analyze it using a computational approach with issues that are independent, binary, and symmetric; we compare the outcomes of various democratic systems using Direct Democracy with majority voting and full participation as an ideal baseline. We find through theoretical and empirical analysis that FRD can yield significant improvements over RD for emulating DD with full participation.
Stable and Envy-free Partitions in Hedonic Games
Authors: Barrot Nathanaël , Yokoo Makoto
Published: July 2019

In this paper, we study coalition formation in hedonic games through the fairness criterion of envy-freeness.
Since the grand coalition is always envy-free, we focus on the conjunction of envy-freeness with stability notions.
We first show that, in symmetric and additively separable hedonic games, an individually stable and justified envy-free partition may not exist and deciding its existence is NP-complete.
Then, we prove that the top responsiveness property guarantees the existence of a Pareto optimal, individually stable, and envy-free partition, but it is not sufficient for the conjunction of core stability and envy-freeness.
Finally, under bottom responsiveness, we show that deciding the existence of an individually stable and envy-free partition is NP-complete, but a Pareto optimal and justified envy-free partition always exists.
On Retrospecting Human Dynamics with Attention
Authors: Dong Minjing , Xu Chang
Published: July 2019

Deep recurrent neural networks have achieved impressive success in forecasting human motion with a sequence to sequence architecture. However, forecasting in longer time horizons often leads to implausible human poses or converges to mean poses, because of error accumulation and difficulties in keeping track of longerterm information. To address these challenges, we propose to retrospect human dynamics with attention. A retrospection module is designed upon RNN to regularly retrospect past frames and correct mistakes in time. This significantly improves the memory of RNN and provides sufficient information for the decoder networks to generate longer term prediction. Moreover, we present a spatial attention module to explore and exploit cooperation among joints in performing a particular motion. Residual connections are also included to guarantee the performance of short term prediction. We evaluate the proposed algorithm on the largest and most challenging Human 3.6M dataset in the field. Experimental results demonstrate the necessity of investigating motion prediction in a self audit manner and the effectiveness of the proposed algorithm in both short term and long term predictions.