Development of Fin Propelled Unmanned Underwater Drone

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
K. Vishwanath ◽  
P.C. Arunakumara ◽  
V. Sindhooraa ◽  
P. Kruthardh ◽  
G.S. Upadhyayaa ◽  
...  
Keyword(s):  
Recent Decade ◽  
Underwater Vehicle ◽  
Development Stage ◽  
Elastic Membrane ◽  
Motion Pattern ◽  
Electronic Components ◽  
Fin Rays ◽  
And Performance ◽  
New Applications ◽  
Biological Organisms

The development of Unmanned Underwater Vehicle (UUV) in the recent decade has opened new applications in navy and marine platforms. UUV is either autonomous or radio-controlled robots that can operate underwater without a human occupant. Manoeuvrability must be considered with higher priority during the development stage of the drone. Any vehicle that mimics biological organisms has better performance and efficiencies. The UUV being fabricated is propelled with the help of two adulatory fins inspired by the locomotion of rays and cuttlefish and will be controlled wirelessly. Each fin mechanism is comprised of individually actuated fin rays, which are interconnected by an elastic membrane. An on-board microcontroller is used to generate the motion pattern that results in fin undulations which propels the UUV. The designed hull portion consists of electronic components with leakage proof and also holds the fin. An attempt has been made to develop the UUV with improved manoeuvrability and performance features.

Multidimensional Grey Evaluation Method for Aeronautic Electronic Components & Devices Selection

2012 ◽  
Vol 214 ◽  
pp. 469-474 ◽  
Author(s):  
Xiang Fen Wang ◽  
Cheng Gao ◽  
Gui Cui Fu
Keyword(s):  
Evaluation Method ◽  
Selection Process ◽  
Development Stage ◽  
Electronic Components ◽  
Product Reliability ◽  
Product Use ◽  
Important Means

Aeronautic electronic components & devices selection is an important means to improve the aeronautic product reliability in its development stage. This paper proposes a multidimensional grey evaluation method to evaluate the electronic components & devices selection process by four indexes after the analysis of aeronautic production contractors and component manufactures. A memory selection example was presented to prove the feasibility of the proposed method. The proposed method can avoid the evaluation error effectively due to subjective factors and help to improve the product use reliability.

scholarly journals Hydropower, Geothermal, and Ocean Energy

MRS Bulletin ◽  
2008 ◽  
Vol 33 (4) ◽  
pp. 389-395 ◽  
Author(s):  
Ralph E.H. Sims
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
New Technologies ◽  
Materials Science ◽  
Development Stage ◽  
Design Development ◽  
Ocean Energy ◽  
Improve Design ◽  
And Performance ◽  
Improve Reliability

AbstractSome forms of renewable energy have long contributed to electricity generation, whereas others are just emerging. For example, large-scale hydropower is a mature technology generating about 16% of global electricity, and many smaller scale systems are also being installed worldwide. Future opportunities to improve the technology are limited but include upgrading of existing plants to gain greater performance efficiencies and reduced maintenance. Geothermal energy, widely used for power generation and direct heat applications, is also mature, but new technologies could improve plant designs, extend their lifetimes, and improve reliability. By contrast, ocean energy is an emerging renewable energy technology. Design, development, and testing of a myriad of devices remain mainly in the research and development stage, with many opportunities for materials science to improve design and performance, reduce costly maintenance procedures, and extend plant operating lifetimes under the harsh marine environment.

New Developments in the Plasma Transferred Arc Process

1997 ◽  
Author(s):  
R.J. DuMola ◽  
G.R. Heath
Keyword(s):  
High Performance ◽  
Power Utility ◽  
Small Areas ◽  
Powder Alloys ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Recent Developments ◽  
Coating Method ◽  
And Performance ◽  
New Applications

Abstract The plasma transferred arc process continues to be the coating method of choice for the application of cobalt base alloys onto valve and valve trim. Although new applications have been developed over the years, the process remains largely associated with the application of high performance, highly alloyed powders for relatively small parts or small areas of large parts. The use of the plasma transferred arc process for large volume application has been limited by the robustness and performance characteristics of the equipment and the use of cobalt. A new plasma transferred arc system (power source, torch and process controller) has been developed which allows the application of powder metal alloys at deposition rates of up to 40 pounds per hour. In addition, there has been a development of new non-cobalt powder alloys with excellent mixed corrosion and wear resistance properties. These capabilities have rendered the process technically and economically viable for large and demanding applications in the mining, power utility and steel industries. The new PTA system and the recent developments in powder alloys will be discussed. Reference will be made to specific applications in target industries.

Board Independence and the Efficacy of Social Reporting

2017 ◽  
Vol 17 (1) ◽  
pp. 25-45 ◽  
Author(s):  
Mustafa A. Dah ◽  
Mohammad I. Jizi
Keyword(s):  
Recent Decade ◽  
Governance Structure ◽  
Independent Directors ◽  
Board Independence ◽  
Corporate Boards ◽  
Future Prospects ◽  
Csr Reporting ◽  
Corporate Governance Code ◽  
Effective Discharge ◽  
And Performance

ABSTRACT The recent decade of scandals, financial crisis, and loss in moral values questioned the soundness of firms' governance structure and held them more accountable to their societies. This put corporate boards under increased pressure to acknowledge their monitoring needs and respond to societal obligations. This paper offers a deepened understanding of the CSR-firm welfare relationship by suggesting its reliance on the participation of independent directors on corporate boards. Our findings show that higher board independence increases social disclosures. We also show that the effect of social disclosure on the firm's risk and performance is favorably affected by the participation of independent directors on corporate boards. Accordingly, we demonstrate that board independence not only facilitates firms' CSR reporting, but also positively influences the CSR-firm performance association. Board independence enhances the efficacy of CSR reporting by elevating the reliability of the disclosed information and amplifying its signaling power regarding the firm's future prospects. Our empirical evidence supports the U.K. corporate governance code main principles encouraging higher board independence for effective discharge of responsibilities.

Thick Film Pastes for Power Applications

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000155-000161
Author(s):  
Christina Modes ◽  
Melanie Bawohl ◽  
Jochen Langer ◽  
Jessica Reitz ◽  
Anja Eisert ◽  
...  
Keyword(s):  
Thick Film ◽  
Electric Vehicles ◽  
Hybrid Electric Vehicles ◽  
Thermal Dissipation ◽  
Automotive Applications ◽  
Electrical Systems ◽  
Electronic Circuitry ◽  
And Performance ◽  
New Applications ◽  
Thick Film Technology

Electronic circuits made by thick film technology are commonly used today in electronic circuitry for automotive applications. Densely packed multi-layer hybrid circuits are very well established for motor and transmission management in standard gasoline fuelled vehicles. As automotive technology shifts from mechanical systems to electrical systems and toward more electrically driven vehicles, such as hybrid electric vehicles and full electric vehicles, thick film systems need to be adapted to fit the challenges and needs of these new applications. The following is a description of a new set of thick film pastes, both precious and base metal, which have attributes and performance suitable for power electronics in automotive applications. The materials provide a means to use common thick film technology to build power circuits to meet the new needs, such as high current carrying capacity and thermal dissipation.

New applications and performance of bioelectrochemical systems

2009 ◽  
Vol 85 (6) ◽  
pp. 1673-1685 ◽  
Author(s):  
Hubertus V. M. Hamelers ◽  
Annemiek Ter Heijne ◽  
Tom H. J. A. Sleutels ◽  
Adriaan W. Jeremiasse ◽  
David P. B. T. B. Strik ◽  
...  
Keyword(s):  
Bioelectrochemical Systems ◽  
And Performance ◽  
New Applications

Co-Firing Technology for Buried Resistors

2003 ◽  
Author(s):  
G. Yadagiri ◽  
K. K. Goswami ◽  
K. S. Gurumurthy ◽  
Satyam ◽  
K. N. Shankara
Keyword(s):  
Thick Film ◽  
Firing Process ◽  
Electronic Systems ◽  
Electronic Components ◽  
Sequential Processing ◽  
Intermediate Layers ◽  
Firing Technology ◽  
And Performance ◽  
Embedded Resistors ◽  
Made In

The complexity and performance of the electronic components and systems is increasing and placing greater demands on compact packaging and interconnection technologies. Multilayer thick film technology is one of the important technologies adopted in the miniaturization of electronic systems. Normally only interconnections are made in the intermediate layers. The possibility of fabricating resistors along with interconnections in the intermediate layers using conventional thick film materials using co-firing process has been examined in this paper. Normally multilayer structures are fabricated by printing / drying / firing of each layer separately starting from the bottom most layer (sequential processing). In this process the bottom layers undergo sintering many times. To avoid many firing cycles and to save power and processing time, a study is taken up to examine the effects of co-firing on the multilayer structure with embedded resistors. The results of the study are presented in this paper.

scholarly journals A systematic review on business analytics

2020 ◽  
Vol 13 (2) ◽  
pp. 283
Author(s):  
Jiarui Yin ◽  
Vicenc Fernandez
Keyword(s):  
Systematic Review ◽  
Business Performance ◽  
Relevant Literature ◽  
Recent Decade ◽  
Machine Learning Techniques ◽  
Future Research ◽  
Business Analytics ◽  
And Performance ◽  
Definition Of ◽  
Industry Sectors

Purpose: Business analytics, a buzzword of the recent decade, has been applied by thousands of enterprises to help generate more values and enhance their business performance. However, many aspects of business analytics remain unclear. This study clarifies the definition of business analytics combined with its functionality and the relation between business analytics and business intelligence. Moreover, we illustrate the applications of business analytics in both business areas and industry sectors and shed light on the education in business analytics. Ultimately, to facilitate future research, we summarize several research techniques used in the literature reviewed.Design/methodology/approach: We set well-established selection criteria to select relevant literature from two widely recognized databases: Scopus and Web of Science. Afterward, we reviewed the literature and coded relevant sections in an inductive way using MAXQDA. Then we compared and synthesized the coded information.Findings: There are mainly four findings. Firstly, according to the bibliometric analysis, literature about business analytics is growing exponentially. Secondly, business analytics is a system that enabled by machine learning techniques aiming at promoting the efficiency and performance of an organization by supporting the decision-making process. Thirdly, the application of business analytics is comprehensive, not only in specific areas of a company but also in different industry sectors. Finally, business analytics is interdisciplinary, and the successful training should involve technical, analytical, and business skills.Originality/value: This systematic review, as a synthesis of the current research on business analytics, can serve as a quick guide for new researchers and practitioners in the field, while experienced scholars can also benefit from this work, taking it as a practical reference.

Thermal Management of Downhole Oil and Gas Logging Sensors for HTHP Applications Using Nanoporous Materials

2007 ◽  
Author(s):  
Saeed Rafie
Keyword(s):  
Oil And Gas ◽  
Electrical Response ◽  
Heat Sinks ◽  
Transient Temperature ◽  
Nanoporous Material ◽  
Electronic Components ◽  
Thermal Shield ◽  
One Dimensional ◽  
And Performance ◽  
Downhole Temperature

One of the main challenges in designing oil & gas downhole wireline logging tools for high temperature and high pressure (HTHP) environments is to put together the most efficient thermal packaging to enhance the tool’s temperature survival time. In general, not all electronic components and sensors can withstand severe downhole temperature (max 500 degrees Fahrenheit). For those heat sensitive components, their electrical response and performance either decay or in some cases they completely fail when their temperature exceeds 300° F. In oil & gas wireline logging applications, the heat sensitive components can be thermally protected inside a Dewar vacuum flask that includes one or two thermal isolators and heat sinks. Cooler electronic components results in longer logging times that lead to a much higher performance and profitability. This paper first discusses the development of a one-dimensional analytical model to determine the transient temperature of heat sensitive sensors and electronic components in wireline logging tools. Second, it introduces a new and improved thermal packaging scheme based on a newly developed and commercially available nanoporous material. This material has a very low thermal conductivity and is used as a thermal shield between the outside environment and the electronics inside the flask. The new packaging scheme also includes a new design for the heat sink which is made of several solid disks separated by this nanoporous material. Results from this new design have shown roughly a 30% improvement compared with the conventional design. Results from both analytical and laboratory tests are discussed in this paper.

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