scholarly journals МЕТОД ЗАГАЛЬНОГО ПРОЕКТУВАННЯ РЕГІОНАЛЬНИХ ПАСАЖИРСЬКИХ ЛІТАКІВ

2019 ◽  
pp. 4-31
Author(s):  
О. Г. Гребеніков ◽  
О. Д. Донець ◽  
С. В. Трубаєв ◽  
А. С. Чумак
Keyword(s):  
Flight Control ◽  
High Efficiency ◽  
Integrated Design ◽  
Global Market ◽  
Comfort Level ◽  
Radio Communication ◽  
High Level ◽  
International Airlines ◽  
Passenger Aircraft ◽  
Navigation Equipment

A method of general design of regional passenger planes for transportation of passengers, baggage, mail and cargo on domestic and international airlines with the possibility of operating on airfields with concrete and prepared unpaved runways is proposed. Airplane is designed to replace the outdated Tu-134 passenger aircraft in the fleet of airlines of the CIS and other countries. The concept of creating an aircraft using integrated design systems has been developed. The effect of the aircraft parameters on the aerodynamic and mass characteristics was taken into account, subject to the requirements for layout and flight safety. The range of variation of the aircraft modifications parameters has been determined. The method has been tested by comparing the obtained parameters with the regional passenger aircraft of the Antonov State Enterprise.The aircraft features a modern aerodynamic configuration and efficient engines. Modern flight and navigation equipment and radio communication equipment, the use of multifunctional indicators, electrical distant flight control system allowing them to be used on any airways, in simple and complex meteorological conditions, day and night, and on routes with high flight intensity at high comfort level of passengers and crew.Passenger comfort is provided at the average level of long-haul aircraft, and is achieved by a rational layout and composition of service rooms, deep ergonomic optimization of the overall and individual space of the passenger compartment. The aircraft fully complies with the AP-25 airworthiness standards.The main technical characteristics of the aircraft are comparable to the characteristics of the analogue aircraft of Embraer and Bombardier companies. In addition, the aircraft has several advantages, such as the ability to operate on aerodromes with poorly prepared and unpaved runways, the presence of a door-ramp, high engine safety from damage by foreign objects, a high level of passenger comfort and large luggage racks, high efficiency of operation; high level of competitiveness in the global market

scholarly journals ОСОБЛИВОСТІ ІНТЕГРОВАНОГО ПРОЕКТУВАННЯ РЕГІОНАЛЬНИХ ПАСАЖИРСЬКИХ ЛІТАКІВ

2020 ◽  
pp. 37-60
Author(s):  
О. Г. Гребеніков ◽  
А. М. Гуменний ◽  
О. Д. Донець ◽  
С. В. Трубаєв ◽  
А. С. Чумак
Keyword(s):  
Production Systems ◽  
Three Dimensional ◽  
Integrated Design ◽  
Weather Conditions ◽  
World Market ◽  
Space Distribution ◽  
Distribution Model ◽  
Analytical Geometry ◽  
High Level ◽  
Passenger Aircraft

The features of the integrated design of competitive regional passenger airplanes intended to carry passengers, baggage, mail and cargo on domestic and international airlines with the possibility of operation at paved aerodromes and prepared unpaved runways are given. It is planned that application of the proposed features of the concept and principles, and their implementation will create aircraft to replace the previous generation of the regional passenger aircraft fleet of airlines of different countries. The concept and principles of its implementation are based on the use of integrated design and production systems. The proposed opportunity to study influence of aircraft parameters on aerodynamic and mass characteristics, provided that the requirements of Aviation Regulations (AP) for the layout and flight safety are met. For testing, the results of such studies shown for various modifications of passenger aircraft of the ANTONOV State Company.The features of creating a three-dimensional computer model of the designed aircraft master geometry, developing a space distribution model, analytical standards for structural load-bearing elements designed using analytical geometry methods with the help of integrated CAD \ CAM \ CAE \ PLM systems in a single information environment for supporting the aircraft life cycle are shown.The aircraft under design must fully comply with the AP-25 Airworthiness Requirements.The main technical characteristics of the designed aircraft, taking into account the proposed solutions, are close in magnitude to the characteristics of the similar aircraft. If necessary it is possible to take into account the peculiarities of aircraft operation at aerodromes with badly paved and unpaved runways to provide the opportunity of its usage on any airways, in simple and difficult weather conditions, during day and night, as well as on routes with a high flight intensity with a high level of crew comfort, which will ensure a high level of competitiveness of the aircraft in the world market.

Integrated Design and Multi-Objective Optimization of a Single Stage Heat-Pump Turbocompressor

2013 ◽  
Author(s):  
J. Schiffmann
Keyword(s):  
Design Optimization ◽  
High Efficiency ◽  
Integrated Design ◽  
Heat Pumps ◽  
Small Scale ◽  
Multi Objective Optimization ◽  
Design Constraints ◽  
Multi Objective ◽  
Wide Range ◽  
Standard Design

Small scale turbomachines in domestic heat pumps reach high efficiency and provide oil-free solutions which improve heat-exchanger performance and offer major advantages in the design of advanced thermodynamic cycles. An appropriate turbocompressor for domestic air based heat pumps requires the ability to operate on a wide range of inlet pressure, pressure ratios and mass flows, confronting the designer with the necessity to compromise between range and efficiency. Further the design of small-scale direct driven turbomachines is a complex and interdisciplinary task. Textbook design procedures propose to split such systems into subcomponents and to design and optimize each element individually. This common procedure, however, tends to neglect the interactions between the different components leading to suboptimal solutions. The authors propose an approach based on the integrated philosophy for designing and optimizing gas bearing supported, direct driven turbocompressors for applications with challenging requirements with regards to operation range and efficiency. Using previously validated reduced order models for the different components an integrated model of the compressor is implemented and the optimum system found via multi-objective optimization. It is shown that compared to standard design procedure the integrated approach yields an increase of the seasonal compressor efficiency of more than 12 points. Further a design optimization based sensitivity analysis allows to investigate the influence of design constraints determined prior to optimization such as impeller surface roughness, rotor material and impeller force. A relaxation of these constrains yields additional room for improvement. Reduced impeller force improves efficiency due to a smaller thrust bearing mainly, whereas a lighter rotor material improves rotordynamic performance. A hydraulically smoother impeller surface improves the overall efficiency considerably by reducing aerodynamic losses. A combination of the relaxation of the 3 design constraints yields an additional improvement of 6 points compared to the original optimization process. The integrated design and optimization procedure implemented in the case of a complex design problem thus clearly shows its advantages compared to traditional design methods by allowing a truly exhaustive search for optimum solutions throughout the complete design space. It can be used for both design optimization and for design analysis.

scholarly journals The YadA Protein of Yersinia pseudotuberculosis Mediates High-Efficiency Uptake into Human Cells under Environmental Conditions in Which Invasin Is Repressed

2002 ◽  
Vol 70 (9) ◽  
pp. 4880-4891 ◽  
Author(s):  
Julia Eitel ◽  
Petra Dersch
Keyword(s):  
Extracellular Matrix ◽  
Mammalian Cells ◽  
Yersinia Pseudotuberculosis ◽  
High Efficiency ◽  
Environmental Parameters ◽  
Infection Process ◽  
Nutrient Concentrations ◽  
Integrin Receptors ◽  
Uptake Process ◽  
High Level

ABSTRACT The YadA protein is a major adhesin of Yersinia pseudotuberculosis that promotes tight adhesion to mammalian cells by binding to extracellular matrix proteins. In this study, we first addressed the possibility of competitive interference of YadA and the major invasive factor invasin and found that expression of YadA in the presence of invasin affected neither the export nor the function of invasin in the outer membrane. Furthermore, expression of YadA promoted both bacterial adhesion and high-efficiency invasion entirely independently of invasin. Antibodies against fibronectin and β1 integrins blocked invasion, indicating that invasion occurs via extracellular-matrix-dependent bridging between YadA and the host cell β1 integrin receptors. Inhibitor studies also demonstrated that tyrosine and Ser/Thr kinases, as well as phosphatidylinositol 3-kinase, are involved in the uptake process. Further expression studies revealed that yadA is regulated in response to several environmental parameters, including temperature, ion and nutrient concentrations, and the bacterial growth phase. In complex medium, YadA production was generally repressed but could be induced by addition of Mg2+. Maximal expression of yadA was obtained in exponential-phase cells grown in minimal medium at 37°C, conditions under which the invasin gene is repressed. These results suggest that YadA of Y. pseudotuberculosis constitutes another independent high-level uptake pathway that might complement other cell entry mechanisms (e.g., invasin) at certain sites or stages during the infection process.

scholarly journals Carebots

2016 ◽  
Vol 138 (09) ◽  
pp. S8-S13 ◽  
Author(s):  
Thiago Marinho ◽  
Christopher Widdowson ◽  
Amy Oetting ◽  
Arun Lakshmanan ◽  
Hang Cui ◽  
...  
Keyword(s):  
Older Adults ◽  
Multidisciplinary Approach ◽  
Human Perception ◽  
The Elderly ◽  
Comfort Level ◽  
Robot System ◽  
Perceived Safety ◽  
High Level ◽  
Future Work ◽  
Flying Robots

This article demonstrates a multidisciplinary approach that proposes to augment future caregiving by prolonged independence of older adults. The human–robot system allows the elderly to cooperate with small flying robots through an appropriate interface. ASPIRE provides a platform where high-level controllers can be designed to provide a layer of abstraction between the high-level task requests, the perceptual needs of the users, and the physical demands of the robotic platforms. With a robust framework that has the capability to account for human perception and comfort level, one can provide perceived safety for older adults, and further, add expressively that facilitates communication and interaction continuously throughout the stimulation. The proposed framework relies on an iterative process of low-level controllers design through experimental data collected from psychological trials. Future work includes the exploration of multiple carebots to cooperatively assist in caregiving tasks based on human-centered design approach.

High Efficiency Combined Aggregate – Submerged Combustion Melter–Electric Furnace for Vitrification of High-Level Radioactive Wastes

2004 ◽  
Author(s):  
L. S. Pioro ◽  
I. L. Pioro
Keyword(s):  
Electric Furnace ◽  
High Efficiency ◽  
High Capacity ◽  
Main Idea ◽  
Melting Process ◽  
Radioactive Wastes ◽  
Single Stage ◽  
Interface Surface ◽  
High Level ◽  
Submerged Combustion

It is well known that high-level radioactive wastes (HLRAW) are usually vitrified inside electric furnaces. Disadvantages of electric furnaces are their low melting capacity and restrictions on charge preparation. Therefore, a new concept for a high efficiency combined aggregate – submerged combustion melter (SCM)–electric furnace was developed for vitrification of HLRAW. The main idea of this concept is to use the SCM as the primary high-capacity melting unit with direct melt drainage into an electric furnace. The SCM employs a single-stage method for vitrification of HLRAW. The method includes concentration (evaporation), calcination, and vitrification of HLRAW in a single-stage process inside a melting chamber of the SCM. Specific to the melting process is the use of a gas-air or gas-oxygen-air mixture with direct combustion inside a melt. Located inside the melt are high-temperature zones with increased reactivity of the gas phase, the existence of a developed interface surface, and intensive mixing, leading to intensification of the charge melting and vitrification process. The electric furnace clarifies molten glass, thus preparing the high-quality melt for subsequent melt pouring into containers for final storage.

scholarly journals Execution time - area tradeoff in gausing residual load decoder: Integrated exploration of chaining based schedule and allocation in HLS for hardware accelerators

2014 ◽  
Vol 27 (2) ◽  
pp. 235-249 ◽  
Author(s):  
Anirban Sengupta ◽  
Reza Sedaghat ◽  
Vipul Mishra
Keyword(s):  
Execution Time ◽  
Design Space Exploration ◽  
Design Space ◽  
Space Exploration ◽  
Integrated Design ◽  
Hardware Accelerators ◽  
Average Improvement ◽  
Genetic Algorithm Approach ◽  
High Level ◽  
The Cost

Design space exploration is an indispensable segment of High Level Synthesis (HLS) design of hardware accelerators. This paper presents a novel technique for Area-Execution time tradeoff using residual load decoding heuristics in genetic algorithms (GA) for integrated design space exploration (DSE) of scheduling and allocation. This approach is also able to resolve issues encountered during DSE of data paths for hardware accelerators, such as accuracy of the solution found, as well as the total exploration time during the process. The integrated solution found by the proposed approach satisfies the user specified constraints of hardware area and total execution time (not just latency), while at the same time offers a twofold unified solution of chaining based schedule and allocation. The cost function proposed in the genetic algorithm approach takes into account the functional units, multiplexers and demultiplexers needed during implementation. The proposed exploration system (ExpSys) was tested on a large number of benchmarks drawn from the literature for assessment of its efficiency. Results indicate an average improvement in Quality of Results (QoR) greater than 26% when compared to a recent well known GA based exploration method.

WORKFORCE RETENTION STRATEGIES AND CORPORATE DEVELOPMENT: AN EMPIRICAL STUDY

2018 ◽  
Vol 1 (1) ◽  
pp. 1-10
Author(s):  
Matthew Adekunle ABIORO ◽  
Dauda Adewole OLADEJO ◽  
Faderera Oluwatoyin ASHOGBON
Keyword(s):  
Statistical Technique ◽  
Global Market ◽  
Primary Data ◽  
Staff Retention ◽  
Retention Strategies ◽  
Corporate Development ◽  
Workforce Retention ◽  
High Level ◽  
The Relationship ◽  
Retention Practices

Over the years, managers are being faced with the challenges of how to handle issues relating to high rates of employees’ turnover due to increasing competition in the global market. Not only that, retention also affects the performance and productivity of any organization if not managed adequately. It is against this backdrop that this study examined the influence of workforce retention strategies on corporate development in Nigeria. The study used primary data collected through a structured questionnaire. Descriptive statistical techniques were used to determine the frequencies and percentages of demographic reports of the respondents, while inferential statistical technique of product moment correlation coefficient (PPMC) was used to analyze the relationship between workforce retention strategies and corporate development. Findings however revealed that there is a significant influence at p<0.05 of workforce retention on corporate development. The result indicated a positive relationship between staff retention (r=0.553) on corporate development in Nigeria. The study confirmed a number of conclusions and recommendations. Aspect revealed which most likely to influence job satisfaction and bring about workforce retentions are; appropriate compensation and reward system, high level of communication, training and development and ultimately good work environment. Finally, for a sustainable corporate development, management should work towards ensuring a proper alignment of different retention practices with staffs’ value and needs. Also, all staffs at different cadres, should be treated with utmost fairness and equity.

ArgoMoon: the Italian cubesat for Artemis1 mission

2021 ◽  
Author(s):  
Simone Pirrotta ◽  
Biagio Cotugno ◽  
Valerio di Tana ◽  
Silvio Patruno ◽  
Francesca Ingiosi ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Flight Control ◽  
Power Distribution ◽  
New Technology ◽  
Recognition Algorithm ◽  
Deep Space ◽  
Ground Segment ◽  
Space Agency ◽  
Flight Operations ◽  
High Level

&lt;p&gt;In order to increase the scientific and technological return of the Artemis I mission, NASA has directed the SLS Program to accommodate Secondary Payloads on board of the Space Launch System (SLS), to be deployed with the Orion capsule; among them, ArgoMoon cubesat has been selected as European contribution. It is a 6U platform designed by Argotec on behalf of the Italian Space Agency (ASI) and will be released from the launch vehicle Interim Cryogenic Propulsion Stage (ICPS). The main objectives of the satellite are: i) taking photographs to document the ICPS after the deployment of the Orion capsule and the deployment of the other secondary payloads mounted on-board; ii) taking photographs of the Earth and the Moon; iii) validate guidance and autonomous targeting technology and iv) verifying a new technology for power distribution, satellite data acquisition and processing suitable for nanosatellite volume. In fact, the cubesat will be the first national spacecraft working in near Deep Space and operated through a Ground Segment mainly based in Italy.&lt;/p&gt; &lt;p&gt;ArgoMoon design is based on the HAWK platform, designed by Argotec following an &amp;#8220;all in-house&amp;#8221; concept. Some of the main features of this platform are the focus on rad-hard subsystem components, a high level of autonomy capability supported by artificial intelligence, and the scalability towards larger bus sizes.&lt;/p&gt; &lt;p&gt;Early after deployment, ArgoMoon will be able to operate autonomously and perform SLS tracking and proximity flight navigation, making use of a complex image recognition algorithm based on artificial intelligence. These operations are carried out by two optical payloads and the obtained photography will be used to support the NASA and payload communities in providing information regarding the status of their deployment and the condition of the second stage as it completes the final phase of its mission. After that, ArgoMoon will be operative for another six months for technological validation and Moon observation purposes.&lt;/p&gt; &lt;p&gt;During the communication windows throughout the entire satellite lifetime, ArgoMoon will be operated and monitored entirely by the Argotec Mission Control Centre, connected to the Deep Space Network (DSN). The Flight Control Team (FCT) will follow the flight operations with in-house developed software able to plan and validate in orbit activities, verifying the on-board.&lt;/p&gt; &lt;p&gt;After a successfully integration and test campaign, the cubesat has been shipped to USA for the filling activities on the propulsion tanks and the final delivery to NASA for the integration in the SLS, expected in July 2021.&lt;/p&gt; &lt;p&gt;The results of this mission will strongly contribute to future of Space Exploration based on small satellite platforms in Deep Space.&lt;/p&gt;

Medical Tourism

2021 ◽  
pp. 19-42
Author(s):  
Oğuz Doğan
Keyword(s):  
Health Services ◽  
Medical Tourism ◽  
Rapid Development ◽  
Global Market ◽  
Tourism Industry ◽  
Market Shares ◽  
Global Demand ◽  
The World ◽  
High Level ◽  
Demand For Health

The number of travels around the world to benefit from health services provided abroad is increasing every year. The high level of global demand for health services has influenced the rapid development of the medical tourism industry. Due to these developments in the industry, a global market has emerged, the medical tourism market. Countries operating in the industry are also striving to gain share from this large market or to increase their existing market shares. In this study, different perspective on global phenomenon, medical tourism, medical tourism market, and leader destinations in the industry are examined in detail.

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