scholarly journals Design and Analysis of a Helium-Assisted Hybrid Drone for Flight Time Enhancement

2021 ◽  
Author(s):  
Geronimo Macias ◽  
Kooktae Lee
Keyword(s):  
Operation Time ◽  
Flight Time ◽  
Rigorous Analysis ◽  
Sustainable Operations ◽  
Buoyant Force ◽  
Short Operation Time ◽  
And Performance ◽  
The Given ◽  
Pole Location ◽  
Clear Goal

In this paper, a new design of a helium-assisted hybrid drone is proposed for flight time enhancement. As is widely known, most of the drones with a VTOL (vertical take-off and landing) feature have a short operation time, limiting their capability to carry out sustainable operations for the given missions. Thus, with the clear goal of enhancing the flight time, this study aims to develop a hybrid drone system, where a helium balloon is used to provide a lifting force for this purpose. The proposed design for the hybrid drone has several benefits including easiness to manufacture and relatively small size when compared to other types of hybrid drones. Various analyses are conducted for the design of the hybrid drone system including the balloon shape and size, buoyant force, flight time, and connector design. Since stability and performance are one of the most important issues for the new design, the pole location analysis is conducted based on the control theory. This rigorous analysis provides that the proposed hybrid drone design is stable as well as robust against swinging motions. To validate the effectiveness of the proposed design and flight time enhancement, simulations were conducted and experimental results are also provided using the manufactured hybrid drone system. Through the real experiments, it is proved that the hybrid drone can increase the flight time more than 2.5 times while guaranteeing stable motions.

scholarly journals Correlations between the Type of Aggregates in the Bulk Phase and the Functionality and Safety of All-Purpose Cleaners

2021 ◽  
Vol 22 (12) ◽  
pp. 6592
Author(s):  
Artur Seweryn ◽  
Tomasz Wasilewski ◽  
Anita Bocho-Janiszewska
Keyword(s):  
Sodium Chloride ◽  
Magnesium Chloride ◽  
Foam Stability ◽  
Bulk Phase ◽  
Magnesium Salt ◽  
Foaming Properties ◽  
Performance Properties ◽  
Salt Addition ◽  
And Performance ◽  
The Given

The article shows that the type and concentration of inorganic salt can be translated into the structure of the bulk phase and the performance properties of ecological all-purpose cleaners (APC). A base APC formulation was developed. Thereafter, two types of salt (sodium chloride and magnesium chloride) were added at various concentrations to obtain different structures in the bulk phase. The salt addition resulted in the formation of spherical micelles and—upon addition of more electrolyte—of aggregates having a lamellar structure. The formulations had constant viscosities (ab. 500 mPa·s), comparable to those of commercial products. Essential physical-chemical and performance properties of the four formulations varying in salt types and concentrations were evaluated. It was found that the addition of magnesium salt resulted in more favorable characteristics due to the surface activity of the formulations, which translated into adequately high wettability of the investigated hydrophobic surfaces, and their ability to emulsify fat. A decreasing relationship was observed in foaming properties: higher salt concentrations lead to worse foaming properties and foam stability of the solutions. For the magnesium chloride composition, the effect was significantly more pronounced, as compared to the sodium chloride-based formulations. As far as safety of use is concerned, the formulations in which magnesium salt was used caused a much lesser irritation compared with the other investigated formulations. The zein value was observed to decrease with increasing concentrations of the given type of salt in the composition.

Automatic Parametric Modeling From Non-Feature Based Designs for Additive Manufacturing

2021 ◽  
Author(s):  
Xinyi Xiao ◽  
Byeong-Min Roh
Keyword(s):  
Additive Manufacturing ◽  
3D Models ◽  
Parametric Modeling ◽  
Parametric Models ◽  
Performance Simulation ◽  
Cad Modeling ◽  
3D Cad ◽  
Feature Based ◽  
And Performance ◽  
The Given

Abstract The integration of Topology optimization (TO) and Generative Design (GD) with additive manufacturing (AM) is becoming advent methods to lightweight parts while maintaining performance under the same loading conditions. However, these models from TO or GD are not in a form that they can be easily edited in a 3D CAD modeling system. These geometries are generally in a form with no surface/plane information, thus having non-editable features. Direct fabricate these non-feature-based designs and their inherent characteristics would lead to non-desired part qualities in terms of shape, GD&T, and mechanical properties. Current commercial software always requires a significant amount of manual work by experienced CAD users to generate a feature-based CAD model from non-feature-based designs for AM and performance simulation. This paper presents fully automated shaping algorithms for building parametric feature-based 3D models from non-feature-based designs for AM. Starting from automatically decomposing the given geometry into “formable” volumes, which is defined as a sweeping feature in the CAD modeling system, each decomposed volume will be described with 2D profiles and sweeping directions for modeling. The Boolean of modeled components will be the final parametric shape. The volumetric difference between the final parametric form and the original geometry is also provided to prove the effectiveness and efficiency of this automatic shaping methodology. Besides, the performance of the parametric models is being simulated to testify the functionality.

scholarly journals The Impact of Organizational Culture and Performance Work System on Employees’ Performance

2018 ◽  
Vol 11 (6) ◽  
pp. 199 ◽  
Author(s):  
Amirreza Salehipour ◽  
Abdollah Ah mand
Keyword(s):  
Organizational Culture ◽  
High Performance ◽  
Ministry Of Education ◽  
Work System ◽  
Strong Relation ◽  
High Performance Work System ◽  
Research Questions ◽  
And Performance ◽  
The Impact ◽  
The Given

Necessity of improving employees’ performance in ministry of education in Iran was the reason of conducting this research. Authors are focused on the impact of High Performance Work System (HPWS) and the culture of organization on employees’ performance in Iran ministry of education. By conducting specified study based on distributed survey questionnaire to 162 members of ministry of education in Iran, this study aims to provide answer to the given research questions of study. The outcome of hypotheses testing illustrate HPWS significantly effects ministry members’ performance and shows strong relation between variables. Likewise, organizational culture demonstrates significant affirmative impact on Iran ministry of education members and employees’ performance. Findings of current research indicate that the ministry of education in Iran requires immediate action toward improving performance of members to obtain desired outcome. Accordingly, to the result of present study, current research attempts to provide practical concepts and illustrate limitations, suggestions for improvement of ministry and future study in this field.

scholarly journals Turbinoplasty of hypertrophied inferior turbinate by diode laser

1970 ◽  
Vol 16 (1) ◽  
pp. 29-34
Author(s):  
Md Rojibul Hoque ◽  
Asaduzzaman Rasel ◽  
Md Khalid Asad ◽  
Moni Lal Aich
Keyword(s):  
Diode Laser ◽  
Local Anesthesia ◽  
Operation Time ◽  
Inferior Turbinate ◽  
Complete Relief ◽  
Clinical Experiences ◽  
Short Operation Time ◽  
The Mean ◽  
Conventional Radiology

Background: Different laser types have been used for the treatment of hypertrophied inferiornasal turbinates. The clinical experiences of its treatment by means of a diode laser are presented.Methods: A total of 45 patients suffering from nasal obstruction due to hypertrophied inferiorturbinates (HIT) were treated with a continuous diode laser (14 W- 940 nm) in "contact" modeand under local anesthesia. Thirty patients (16 with allergic rhinitis and 14 with vasomotorrhinitis) were included into this clinical trial with a follow-up of 6 months. The study wasconducted by a questionnaire, photo documentation, conventional radiology of the paranasalsinuses, and histology.Results: The mean operation time took 8 min/turbinate, no nasal packing was necessary andno immediate complications (e.g., bleeding) were observed. Statistical analysis revealedsignificant subjective improvement (86%) of the nasal airflow and nasal cavity volume (photodocumentation) 6 months after laser surgery. In addition, complete relief of headache wasachieved in 32%. The remission rates of persistent rhinorrhoea and post-nasal dripping were,at about 88% and 64%, respectively. Atrophic change and synechiae had not been observed.Conclusions: Diode laser treatment of HIT is a useful procedure, which can be performed as anoutpatient surgery under local anesthesia, resulting in a controlled coagulation and ablation of thesoft tissue. The short operation time and the good results provide an excellent patient acceptance.Key words: Diode Laser; Hypertrophied Inferior Turbinate; Turbinoplasty.DOI: 10.3329/bjo.v16i1.5778Bangladesh J Otorhinolaryngol 2010; 16(1): 29-34

scholarly journals Intellectual Capital and Operational Excellence: An Influential Assessment

2020 ◽  
Vol 5 (6) ◽  
pp. 1062-1076
Author(s):  
Pavitra Dhamija
Keyword(s):  
Intellectual Capital ◽  
Operations Management ◽  
Performance Standards ◽  
Sustainable Operations ◽  
Future Directions ◽  
Behavioural Research ◽  
Sustainable Operations Management ◽  
And Performance ◽  
Operational Excellence ◽  
Operational Processes

Competent intellectual capital is one of the most essential wealth that an organization requires in the present era of cutthroat competition. Operations management is nothing but management of operational processes in every big and small organization, and such activities constitute a major chunk of all organizational activities. Therefore, the present work targets to explore the association between intellectual capital and operational excellence, review of already conducted studies in the said area, and future directions through systematic literature review process. A total number of 165 articles provided by Scopus database (2010 to 2019) is used for analysis and interpretation. Bibliometric analysis and network analysis deliver significant clusters (operations management and optimization; intellectual capital and intellectual investment; knowledge management and decision support system; strategic planning and resource allocation; sustainable operations management and performance standards; behavioural research and change management), which is in turn a novel contribution of this article. The study concludes with a proposed conceptual model and key take away for researchers, academicians, and managers.

scholarly journals National Service Framework for Mental Health

2000 ◽  
Vol 24 (6) ◽  
pp. 203-206 ◽  
Author(s):  
Graham Thornicroft
Keyword(s):  
Mental Health ◽  
National Service ◽  
Department Of Health ◽  
National Service Framework ◽  
Local Flexibility ◽  
Working Age ◽  
And Performance ◽  
The Given ◽  
Clear Statement ◽  
Service Framework

The National Service Framework for Mental Health (NSF–MH) is a strategic blueprint for services for adults of working age for the next 10 years. It is both mandatory, in being a clear statement of what services must seek to achieve in relation to the given standards and performance indicators, and permissive, in that it allows considerable local flexibility to customise the services which need to be provided to fit the framework. This paper summarises the process by which the NSF was created, and its content, which became clear when it was published on 30 September 1999 (Department of Health, 1999).

scholarly journals An Optimization Framework for Codes Classification and Performance Evaluation of RISC Microprocessors

Symmetry ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 938
Author(s):  
Syed Rameez Naqvi ◽  
Ali Roman ◽  
Tallha Akram ◽  
Majed M. Alhaisoni ◽  
Muhammad Naeem ◽  
...  
Keyword(s):  
Assembly Language ◽  
Optimization Method ◽  
Instruction Set ◽  
Mathematical Performance ◽  
Optimization Framework ◽  
And Performance ◽  
Reduced Instruction Set Computer ◽  
High Level ◽  
The Given ◽  
Primary Contribution

Pipelines, in Reduced Instruction Set Computer (RISC) microprocessors, are expected to provide increased throughputs in most cases. However, there are a few instructions, and therefore entire assembly language codes, that execute faster and hazard-free without pipelines. It is usual for the compilers to generate codes from high level description that are more suitable for the underlying hardware to maintain symmetry with respect to performance; this, however, is not always guaranteed. Therefore, instead of trying to optimize the description to suit the processor design, we try to determine the more suitable processor variant for the given code during compile time, and dynamically reconfigure the system accordingly. In doing so, however, we first need to classify each code according to its suitability to a different processor variant. The latter, in turn, gives us confidence in performance symmetry against various types of codes—this is the primary contribution of the proposed work. We first develop mathematical performance models of three conventional microprocessor designs, and propose a symmetry-improving nonlinear optimization method to achieve code-to-design mapping. Our analysis is based on four different architectures and 324,000 different assembly language codes, each with between 10 and 1000 instructions with different percentages of commonly seen instruction types. Our results suggest that in the sub-micron era, where execution time of each instruction is merely in a few nanoseconds, codes accumulating as low as 5% (or above) hazard causing instructions execute more swiftly on processors without pipelines.

A novel model of acellular dermal matrix plug for anal fistula treatment. Report of a case and surgical consideration based on first utility in Poland

2017 ◽  
Vol 89 (4) ◽  
pp. 52-55 ◽  
Author(s):  
Adam Bobkiewicz ◽  
Łukasz Krokowicz ◽  
Maciej Borejsza-Wysocki ◽  
Tomasz Banasiewicz
Keyword(s):  
Anal Fistula ◽  
Operation Time ◽  
Acellular Dermal Matrix ◽  
Dermal Matrix ◽  
Polish Experience ◽  
Short Operation Time ◽  
New Type ◽  
Fistula Treatment ◽  
Long Term Observation

Anal fistula (AF) is a pathological connection between anus and skin in its surroundings. The main reason for the formation of anal fistula is a bacterial infection of the glands within the anal crypts. One of the modern techniques for the treatment of fistulas that do not interfere with the sphincters consists in implantation of a plug made from collagen material. We are presenting the first Polish experience with a new model of biomaterial plug for the treatment of anal fistula. We also point out key elements of the procedure (both preoperative and intraoperative) associated with this method. In the authors’ opinion, the method is simple, safe and reproducible. Innovative shape of the plug minimizes the risk of its migration and rotation. It also perfectly blends with and adapts to the course and shape of the fistula canal, allowing it to become incorporated and overgrown with tissue in the fistula canal. The relatively short operation time, minor postoperative pain and faster convalescence are with no doubt additional advantages of the method. Long-term observation involving more patients is essential for evaluation of the efficacy of the treatment of fistulas with the new type of plug.

scholarly journals PENGARUH MOTIVASI, KOMPLEKSITAS TUGAS, DAN INSENTIF MONETER TERHADAP KINERJA INDIVIDU

2021 ◽  
Vol 8 (2) ◽  
pp. 67
Author(s):  
Aulia Azzardina
Keyword(s):  
University Students ◽  
Extrinsic Motivation ◽  
Task Complexity ◽  
Monetary Incentives ◽  
Complex Tasks ◽  
Intrinsic And Extrinsic Motivation ◽  
And Performance ◽  
The Given ◽  
The Relationship ◽  
And Task

This study investigates the relationship between motivation and task complexity on performance. Monetary incentives are involved in this study as a moderating variable. The motivation examined in this research is intrinsic and extrinsic motivation. A 2x2 quasi-experiment has been conducted and involving 66 university students. Two and three-way ANOVA are used for hypothetical testing. The result shows that individuals with intrinsic motivation have shown better performance than those with extrinsic motivation. After individuals have faced more complex tasks, they achieved lower scores than those who faced less complex tasks. Prior studies suggested that motivation could be destructed by monetary incentives. However, there is no interaction proof when moderating variable is involved. The relationship between motivation and performance is not influenced by monetary incentives. In line with it, the relationship between task complexity and performance is also not strengthened or weakened by the given monetary incentives information. Thus, monetary incentives failed to influence the relationship between motivation, task complexity and performance.

scholarly journals In Vitro Assay of Translation Inhibition by Trichothecenes Using a Commercially Available System

Toxins ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 696
Author(s):  
Takahito Toyotome ◽  
Katsuhiko Kamei
Keyword(s):  
Protein Synthesis ◽  
Secondary Metabolites ◽  
Operation Time ◽  
In Vitro Assay ◽  
Ease Of Use ◽  
Vitro Assay ◽  
Vast Number ◽  
Translation Inhibition ◽  
Short Operation Time

Trichothecenes are a family of major secondary metabolites produced by some common filamentous fungi, including plant pathogenic and entomopathogenic fungi. It may be considered difficult to conduct a comparison between the toxicities of trichothecenes with consideration of different conditions and cell lines. In the current study, we developed an in vitro assay based on a commercially available system to estimate the translation inhibition, that is, the main toxicity, of trichothecenes. The assay was applied to estimate the inhibition of protein synthesis by trichothecenes. Initially, we examined the assay using trichothecene dissolved in water followed by an assessment of trichothecene solutions dissolved in acetonitrile. The obtained data showed that the assay tolerated the small amount of acetonitrile. The assay examined in this study has the advantages of a short operation time (one day), ease of use, and data stability, as it is a non-cell-based assay whose components are commercially available. It is expected that this assay will contribute to the evaluation of the toxicity of a vast number of trichothecenes.

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