bluuebunny/crossref_metadata_2025_split huggingface dataset:
Selected Aspects of the Low Level Automatic Taxi Control System Concept
Authors: Zajdel Albert , Szczepański Cezary , Krawczyk Mariusz , Graffstein Jerzy , Masłowski Piotr 
Published: June 2019

Abstract
Taxiing of manned and remotely piloted aircraft is still performed by pilots without using a system of automatic control of direction and speed. Several reasons have emerged in recent years that make the automation of taxiing an important design challenge. The reasons are: decreased airport capacity due to the growing number of aircraft, poor ground operation conditions during poor visibility conditions, an increase in workload of pilots and air traffic controllers and the integration of simultaneous ground operations of manned and remotely piloted air vehicles. This paper presents selected aspects of the concept of a Low Level Automatic Taxi Control System. In particular, it emphasizes the means of controlling an aircraft during taxiing, accuracy requirements of the system and proposes control techniques. The resulting controller of the system is adaptable for different aircrafts. The actuators and their mechanical connections to available controls are the aircraft specific part and are designed for the particular type – in this case – a general aviation light airplane.
An Unmanned Aircraft Model for Control System Reconfiguration Analysis and Synthesis
Authors: Żugaj Marcin , Bibik Przemysław , Figat Marcin 
Published: June 2019

Abstract
Reliability of unmanned aircraft is a decisive factor for conducting air tasks in a controlled airspace. One of the means of improving unmanned aircraft reliability is reconfiguration of the control system, which will allow to maintain control over the aircraft despite an occurring failure. The control system is reconfigured by using still operational control surfaces to compensate for failure consequences and to control the damaged aircraft. Development of effective reconfiguration algorithms involves utilization of a non-linear model of unmanned aircraft dynamics, in which each control surface deflection can be controlled independently.
The paper describes a non-linear model of a small unmanned aircraft with decoupled control surfaces. The paper discusses aircraft flight dynamics equations and estimated equations for controllability derivatives for each control surface, the results of comparison tests of the model and actual aircraft as well as the structure of the simulation model. The developed unmanned aircraft model may be used in development and in optimization of control algorithms for aircraft with damaged control systems as well as to test the impact of failures on dynamic properties of the aircraft.
Particle-In-Cell Electrostatic Numerical Algorithm
Authors: Konior Wojciech 
Published: June 2019

Abstract
Existing global models of interaction between the solar wind (SW) and the local interstellar medium (LISM) describe the heliosphere that arises as a result of this interaction. There is a strong motivation to develop a kinetic model using the Particle-in-Cell (PIC) method to describe phenomena which appear in the heliosphere. This is however a long term scientific goal. This paper describes an electrostatic Particle-in-Cell numerical model developed in the Institute of Aviation in Warsaw, which includes mechanical and charge exchange collisions between particles in the probabilistic manner using Direct Simulation Monte Carlo method. This is the first step into developing simulations of the heliosphere incorporating kinetic effects in collisionless plasmas. In this paper we focus only on presenting the work, which have been done on the numerical PIC algorithm.
Preliminary Sub-Systems Design Integrated in a Multidisciplinary Design Optimization Framework
Authors: Fioriti Marco , Boggero Luca , Corpino Sabrina 
Published: June 2019

Abstract
The aircraft design is a complex subject since several and completely different design disciplines are involved in the project. Many efforts are made to harmonize and optimize the design trying to combine all disciplines together at the same level of detail. Within the ongoing AGILE (Horizon 2020) research, an aircraft MDO (Multidisciplinary Design Optimization) process is setting up connecting several design tools and competences together. Each tool covers a different design discipline such as aerodynamics, structure, propulsion and systems. This paper focuses on the integration of the sub-system design discipline with the others in order to obtain a complete and optimized aircraft preliminary design. All design parameters used to integrate the sub-system branch with the others are discussed as for their redefinition within the different detail level of the design.
Latin American Space Research - Challenges and Opportunities
Authors: Gocłowska-Bolek Joanna 
Published: June 2019

Abstract
The interest of Latin American countries in space research has been successfully developing for many decades. It has its roots in the first development programmes for the Brazilian and Argentinian defence industry within the import substitution strategy, and then the export-oriented strategy during the period of the military rule. The endogenous development of space technology was treated in those countries as a priority and served as a way to diffuse technology to other industries, and as a model for the other countries in the region (Peru and Venezuela), which wished to develop outer space programme by developing their own technologies within the chosen range or by partaking in broader cooperation programmes on the Latin American continent [1]. The Latin American space agencies, which already existed in many countries in the 1960s and the 1970s, were carrying out relatively costly research, treating development in this area not only as the achievement of the economic development objectives, but also as an attempt to oppose the dominance of Washington [2]. Despite of the vast funding on endogenous research in the field of space engineering being provided, until the end of the last century only the projects conducted together with the Soviet Union (Cuba) or The United States were accomplished successfully. Currently and in the nearest future, the Latin American countries are still forced to rely on external assistance with satellite launching, expertise, more advanced technologies, etc. It should be noticed that countries conducting advanced and costly space programmes: the United States, Russia, China and the European Union (especially France and – but to a substantially lesser degree – Italy) show a growing interest in cooperation with Latin America and appreciation towards their specialists, high quality research and space technologies.
Aero-Structural Optimization of Joined-Wing Aircraft
Authors: Kalinowski Miłosz 
Published: June 2019

Abstract
Joined-wing aircraft due to its energy characteristics is a suitable configuration for electric aircraft when designed properly. However, because of the specific for this aircraft phenomenons (e.g. static indeterminacy of structure, aerodynamic interference of lifting surfaces) it demands more complicated methods to model its behavior than a traditional aircraft configurations. For these reasons the aero-structural optimization process is proposed for joined-wing aircrafts that is suitable for preliminary design. The process is a global search, modular algorithm based on automatic geometry generator, FEM solver and aerodynamic panel method. The range of aircraft was assumed as an objective function. The algorithm was successfully tested on UAV aircraft. The improvement of 19% of total aircraft range is achieved in comparison to baseline aircraft. Time of evaluation of this global search algorithm is similar to the time characteristic for local optimization methods. It allows to reduce the time and costs of preliminary design of joined-wing.
Stress Distribution Investigation at the Tapered Sandwich Endings
Authors: Löffelmann František 
Published: June 2019

Abstract
One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, at points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration.
Role Conflict, Self Efficacy, Employees’ Performance and Organizational Performance
Authors: Fahmi Hadi Kurnia , Musnadi Said , Nadirsyah Nadirsyah 
Published: June 2019

AbstractObjective – This study aims to analyze the influence of role conflict and self-efficacy towards employees’ performance and its implications on organizational performance at Inspectorate of Nagan Raya District, Aceh, Indonesia. Design/methodology – The sample of this study is 120 auditors. The data was collected through questionnaire and analyzed using Structural Equation Model (SEM). Results – The study found that role conflict and self-efficacy have positive and significant influence on employees’ performance and inspectorate performance at Nagan Raya District. Meanwhile employees’ performance mediates the effect of role conflict and self-efficacy towards inspectorate performance at Nagan Raya District.
IFRSs Adoption and its Influence on Financial Perfor-mance of Listed Consumer Goods Companies in Nigeria
Authors: Balogun Shittu Aliu , Abiodun Sanyaolu Wasiu , Asamu Job-Olatunji Kehinde 
Published: June 2019

AbstractObjective – This study examined the effect of IFRS adoption on financial performance of Listed Consumer Goods Companies in Nigeria. Design/methodology – The study selected 10 out of all the 28 Listed Consumer Goods Companies in Nigeria. Ex post facto research design was adopted and regression analysis through the aid of Eviews 9 was employed in analyzing the effect of IFRS adoption on performance of the selected listed companies. Results – The findings revealed that IFRS adoption has significant positive effect on return on total asset, IFRS adoption has negative insignificant effect on interest coverage ratio, significant positive effect on basic earnings power ratio and that IFRS adoption has negative insignificant effect on leverage. Based on the findings, the study concluded that IFRS adoption has joint significant effect on Return on asset, on Basic earnings power and on Interest coverage while the reverse was the case for financial leverage. Research limitations/implications – This study is limited in the context of consumer goods companies only. Future studies can extend the result of this study by investigating other industry in identifying the implication of IFRS adoption in their businesses.
Knowledge Management Practices of Universities in Bangladesh: Lecturers’ Perception
Authors: Akter Kaniz Marium , Banik Subrata 
Published: June 2019

AbstractObjective – Aim of this study is to focus on the knowledge management practices of universities in Bangladesh. The study attempts to identify the level of four knowledge management dimensions that includes knowledge discovery, knowledge accumulation, knowledge sharing, and knowledge application. Design/methodology – A questionnaire survey was conducted to collect the primary data from 108 university lecturers in Bangladesh. The knowledge management practices of the universities in Bangladesh were recognized by utilizing a close-ended questionnaires that is adapted from the Becerra-Fernandez and Sabherwal’s Knowledge Management Process (2010). Results – Results indicated that three knowledge management dimensions are moderately practiced by the Bangladeshi universities. However, knowledge accumulation was the dominant dimension in comparison with others, where knowledge sharing was the least dominant dimension of knowledge management. Research limitations/implications – The study will facilitate the authorities of higher educational institutions to develop plans and strategies for practicing the knowledge management in the highest level. It is essential for creating a sound knowledge-based culture in the universities. Further research is recommended increasing the sample size and finding the impact of knowledge management on the organizational performance using SEM Model.
Can the Neck Contribute to Persistent Symptoms Post Concussion? A Prospective Descriptive Case Series
Authors: Kennedy Ewan , Quinn Dusty , Chapple Cathy , Tumilty Steve 
Published: June 2019

Background Persistent symptoms post concussion can arise from a range of sources, including the neck. There is little description of neck assessment findings in people with persistent symptoms post concussion. Objectives To assess people with persistent symptoms following a concussion and determine whether the neck has also been injured, and to evaluate the potential of the neck to contribute to their symptoms. Methods A consecutive series of participants (n = 20) referred for neck assessment were prospectively recruited by 2 providers of a multidisciplinary concussion service for people with persistent symptoms. Data were collected at initial assessment and on completion of neck treatment, which included standard questionnaires (Rivermead Post Concussion Symptoms Questionnaire, Neck Disability Index, Dizziness Handicap Inventory); patient-reported measures of headache, dizziness, and neck pain; physical examination findings; and details of comorbidities. Results Participants were evaluated at a mean of 7.5 weeks post concussion (median, 5 weeks). On neck assessment, 90% were considered by the clinician to have a neck problem contributing to their current symptoms. Multiple findings were consistent with this view, including moderate-to-severe Neck Disability Index scores (mean ± SD, 33.4 ± 9.5 points), frequent neck pain (85%), frequent moderate-to-severe pain on occiput-C4 segmental assessment (85%), a positive flexion-rotation test (45%), and muscle tenderness (50%–55%). Conclusion Multiple findings were indicative of concurrent neck injury, particularly involving the upper cervical spine. These neck-related findings are important to recognize, as they have the potential to contribute to persistent symptoms post concussion and may respond to neck treatment. This study was prospectively registered with the Australian New Zealand Clinical Trials Registry (ACTRN12616001183471). J Orthop Sports Phys Ther 2019;49(11):845–854. Epub 1 Jun 2019. doi:10.2519/jospt.2019.8547
Relevansi Teori Belajar Behaviorisme Terhadap Pendidikan Agama Islam
Authors: Pratama Yoga Anjas 
Published: June 2019

Teori belajar behaviorisme dapat digunakan untuk membantu proses pembelajaran. Namun diketahui bahwa banyak percobaan dalam teori behaviorisme dilakukan dengan menggunnakan hewan sehingga menimbulkan pertanyaan, apakah teori belajar behaviorisme sejalan dengan ajaran agama Islam dan dapat digunakan dalam Pendidikan Islam. Penelitian ini merupakan penelitian kepustakaan yang dianalisis dengan menggunakan teknik analisis konten. Hasil dari penelitian ini adalah ditemukan adanya relevansi antara teori belajar behaviorisme terhadap pendidikan Islam, sebagai berikut: (1) Teori belajar behaviorsime dapat digunakan untuk membantu proses pembelajaran pendidikan Islam (2) Teori belajar behaviorsime merupakan teori belajar yang sejalan/berkaitan dengan ajaran agama Islam (3) Adanya pengkondisian (clasical conditioning), pengulangan dan penguatan dalam teori behaviorsime yang juga digunakan dalam pembelajaran pendidikan Islam (4) Teori belajar behaviorsime menurut Edward Lee Thorndike mengandung empat hukum, yaitu: law of radiness (hukum kesiapan), law of exercise (hukum latihan), law of effect (hukum latihan), dan law of attitude (hukum sikap), yang sejalan/berkaitan dengan proses pembelajaran pedidikan Islam.
Kata Kunci: Relevansi, Teori Belajar Behaviorisme, Pendidikan Islam
ẢNH HƯỞNG CỦA MỘT SỐ YẾU TỐ KỸ THUẬT ĐẾN CÔNG THỨC PHỐI CHẾ NƯỚC GIẢI KHÁT GIÀU POLYPHENOL TỪ DỊCH CHIẾT LÁ TÍA TÔ
Authors: Quốc Bảo Võ Văn , Huy Nguyễn Vũ Bá 
Published: June 2019

Mục đích của nghiên cứu này nhằm góp phần hoàn thiện quy trình sản xuất nước giải khát từ dịch chiết giàu polyphenol từ lá tía tô. Trong nghiên cứu này, chúng tôi khảo sát một số yếu tố như lượng đường, acid citric, ascorbic acid, carrageenan và lượng dịch chiết bổ sung ảnh hưởng đến quy trình sản xuất nước giải khát, cũng như khảo sát thời gian thanh trùng để bảo quản sản phẩm. Để thiết lập được công thức phối chế, chúng tôi bổ sung : 12% đường, 0,15% acid citric, 0,05% ascorbic acid, 0,04% carrageenan và lượng dịch chiết là 4%. Ngoài ra, để đảm bảo sản phẩm an toàn vi sinh thực phẩm sau khi sản xuất và đến tay người tiêu dùng, chúng tôi tiến hành thanh trùng ở 80°C trong thời gian 10 phút.
Aluminium High Pressure Die Casting Application on Rear Frame Rails
Authors: ÖZBAY İbrahim , AYDINER Tamer , YİLMAZOGLU Gürkan , CELİK Hafize , AKSEL Levent , YENİ Harun , BAYRAMOGLU Metehan , AYDOGMUS Erdem 
Published: June 2019

Due to the highly competitive environment in automotive industry and environmental restrictions, car manufacturers tend to use higher mechanical properties but better performance in lightweighting instead of traditional structural materials such as steel. Aluminium alloys are a good example of this application since they are 3 times lighter than steel. Aluminium is proposed to use in car body structure design because of its high performance of durability, and in addition with proper geometry and heat treatment the mechanical properties will be also valid for structural parts. Using casting as a process enables to make topology optimization and having more complex shapes that has better strength but less weight with respect to sheet metal stamping.Rear rail reinforcement support bracket is one of the most suitable component of body in white, where topologically optimized aluminium die casted part could be applied. In a conventional reinforcement support bracket, more than one steel stamped parts are used to have desired performance of stiffness and durability which results in much more complex structures in terms of design, formability and assembly. In this study, a new part designed and produced by high pressure casting method to obtain the same performance of current solution. Additionally to obtain better mechanical properties different heat treatments have been tested and the optimum heat treatment cycle has been determined. The new design has been compared to current one with virtual validation tools and the results have been given as comparison.
A Study for Detecting Flow Lines on The Aesthetic Plastic Parts During Design Phases as Using Material Flow Analysis Programs
Authors: KÜÇÜKOĞLU Ayça , VARGELCİ Sinan , ACAR Atanur 
Published: June 2019

In
today’s competitive business environment the automotive industries aim to
increase the usage of the plastic materials in automobile components in order
to reduce weight of the vehicles. Although the plastic materials provide a
considerable savings on vehicle weight, these materials have some problems to
be solved. One of the difficult problems encountered in the production of
plastics is the flow lines on plastics because of its unpredictable behavior.
As a result, considered problem faced by automobile companies often spend
plenty of time and money is an issue to resolve. In this study the source of
plastic flow lines on automotive external aesthetical parts are investigated by
using material flow analysis programs. According to conventional methodologies;
weld lines, temperature differences, filling times, clamping forces, shrinkages
parameters are examined deeply before tooling face especially to eliminate
aesthetical problems. But in this case we observed an unordinary situation such
as flow lines on front bumper visible surfaces after tooling phase and
therefore we searched a new approach to simulate this flow lines on the
material flow analysis program. Flow directions and flow velocity are
comprehensively examined step by step during filling analysis. As a result of
the analysis the geometric factors that affect the balance of flow and brings
turbulence are detected. After the root cause analysis for plastic deformation
the potential techniques are researched to find best solution. Analysis are repeated in the same conditions
that are considered to be made for all geometric changes. The experiment results are comparatively
analyzed and the solution approach that have the best flow balance is selected.
Carotid plaque and type 2 diabetes mellitus
Authors: Bashir Farhat , Nageen Ayesha , Kidwai Saera Sohail , Ara Jamal 
Published: June 2019

Atherosclerosis is the basic cause of macrovasular complications of diabetes mellitus. It affects all parts of the circulatory tree. An easy and reliable method of diagnosing atherosclerosis is Carotid Doppler ultrasonography. Increased Carotid Intima-Medial thickness (CIMT) and presence of carotid plaque is an important predictor of ischemic heart disease and cerebrovascular accidents. The purpose of this study was to find the association of carotid plaque with cardio-metabolic risk factors in type 2 diabetes mellitus. Study Design: Cross-sectional study. Setting: Medical Out-patient Department of Creek General Hospital, Karachi. Period: One year from June 2015 to May 2016. Subjects and Methods: The study population included 119 cases of type 2 diabetes mellitus. All subjects underwent Carotid Doppler ultrasonography. The demographic, anthropometric, clinical and laboratory data was collected and analyzed through SPSS ver.20.0. The relationship of carotid plaque with different atherosclerotic variables was assessed by Student’s t-test and Chi-square test. P-value of <0.5 was considered significant. Results: Out of 119 patients with type 2 diabetes mellitus, 18.5% had a carotid plaque. The presence of plaque was associated with duration of diabetes, presence of hypertension, BMI, diastolic blood pressure, total cholesterol, triglyceride levels and CIMT. Conclusion: We need to focus on management of the multiple metabolic abnormalities associated with diabetes mellitus in order to prevent atherosclerosis and its associated cardiovascular disease.