Development of Novel Nano-Structure Functional Coatings with the Use of the Original Hybrid Device

2011 ◽  
Vol 674 ◽  
pp. 1-9 ◽  
Author(s):  
Adam Mazurkiewicz ◽  
Jerzy Smolik
Keyword(s):  
Technological Process ◽  
Surface Engineering ◽  
Electron Beam Evaporation ◽  
Functional Coatings ◽  
Ion Nitriding ◽  
Nano Structure ◽  
Hybrid Device ◽  
Barrier Coating ◽  
Multi Stage ◽  
And Control

A unique, original hybrid technological device, developed by the authors of the article, enabling the application of lots of different surface engineering methods in one technological process, including arc evaporation, ion nitriding, ion etching, ion implantation and electron beam evaporation is presented. The hybrid technological device has technical possibilities for the simultaneous realisation of different surface engineering methods in the same vacuum chamber. This results in the realization of advanced technological processes with the use of different surface engineering methods for forming the coating’s properties in one multi-stage technological process. Different surface engineering methods use different plasma sources and different methods of the atmosphere creation and often require different supply and control systems. A possibility of combining a few different surface treatment methods in one technological process is provided by a unique hybrid device. Selected applications of hybrid surface engineering technologies executed with the use of this original hybrid device, i.e. creation of the nano-multilayer and nano-composite Cr/Ni-Cr3C2coatings increasing the erosion wear resistance and creation of multi-layer coatings with increased thermal resistance – Thermal Barrier Coating (TBC) are presented

A Multi-Stage Stochastic Programming Approach to the Optimal Surveillance and Control of Emerald Ash Borer in Cities

2020 ◽  
Author(s):  
Eyyüb Y. Kıbış ◽  
I. Esra Buyuktahtakin ◽  
Robert G. Haight ◽  
Najmaddin Akhundov ◽  
Kathleen Knight ◽  
...  
Keyword(s):  
Stochastic Programming ◽  
Emerald Ash Borer ◽  
Programming Approach ◽  
Multi Stage ◽  
And Control

scholarly journals Aggressors and resilient youths in Medellin, Colombia: the need for a paradigm shift in order to overcome violence

2013 ◽  
Vol 29 (11) ◽  
pp. 2208-2216 ◽  
Author(s):  
Luis F. Duque ◽  
Nilton E. Montoya ◽  
Alexandra Restrepo
Keyword(s):  
Public Policy ◽  
Cross Section ◽  
Metropolitan Area ◽  
Paradigm Shift ◽  
Prevention And Control ◽  
High Ratio ◽  
Multi Stage ◽  
Sexually Risky ◽  
And Control ◽  
Resilient Behavior

The objective of this study was to estimate the ratio of resilient youth and compare this to youth with aggressive behavior, and to youth who also exhibit sexually risky behavior and drug use. A cross-section study of a representative sample of people between aged between 12 and 60 who are residents of Medellin, Colombia, and its metropolitan area (N = 4,654) was employed using probabilistic multi-stage sampling. Youth between 14 and 26 years old were selected for the present analysis (n = 1,780). The proportion of resilient youth is 22.9%, of aggressors is 11.3%, and that of youth with other risky conduct is 65.8%. The high ratio of resilient youth calls for a reorientation of public policy toward prevention and control of violence, prioritizing the promotion of resilient behavior instead of continuing with tertiary prevention actions.

scholarly journals Electrophoretic deposition of biomaterials

2010 ◽  
Vol 7 (suppl_5) ◽  
Author(s):  
A. R. Boccaccini ◽  
S. Keim ◽  
R. Ma ◽  
Y. Li ◽  
I. Zhitomirsky
Keyword(s):  
Electrophoretic Deposition ◽  
Functional Coatings ◽  
Tissue Engineering Scaffolds ◽  
Bioactive Coatings ◽  
Inorganic Coatings ◽  
Wide Range ◽  
Particulate Form ◽  
Advanced Biomaterials ◽  
Biological Entities ◽  
And Control

Electrophoretic deposition (EPD) is attracting increasing attention as an effective technique for the processing of biomaterials, specifically bioactive coatings and biomedical nanostructures. The well-known advantages of EPD for the production of a wide range of microstructures and nanostructures as well as unique and complex material combinations are being exploited, starting from well-dispersed suspensions of biomaterials in particulate form (microsized and nanoscale particles, nanotubes, nanoplatelets). EPD of biological entities such as enzymes, bacteria and cells is also being investigated. The review presents a comprehensive summary and discussion of relevant recent work on EPD describing the specific application of the technique in the processing of several biomaterials, focusing on (i) conventional bioactive (inorganic) coatings, e.g. hydroxyapatite or bioactive glass coatings on orthopaedic implants, and (ii) biomedical nanostructures, including biopolymer–ceramic nanocomposites, carbon nanotube coatings, tissue engineering scaffolds, deposition of proteins and other biological entities for sensors and advanced functional coatings. It is the intention to inform the reader on how EPD has become an important tool in advanced biomaterials processing, as a convenient alternative to conventional methods, and to present the potential of the technique to manipulate and control the deposition of a range of nanomaterials of interest in the biomedical and biotechnology fields.

scholarly journals Composite Layers “MgAl Intermetalic Layer / PVD Coating” Obtained On The AZ91D Magnesium Alloy By Different Hybrid Surface Treatment Methods

2015 ◽  
Vol 60 (2) ◽  
pp. 1031-1035 ◽  
Author(s):  
J. Smolik ◽  
A. Mazurkiewicz ◽  
J. Kacprzyńska-Gołacka ◽  
M. Rydzewski ◽  
M. Szota ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Magnesium Alloys ◽  
Surface Engineering ◽  
Composite Layer ◽  
Electron Beam Evaporation ◽  
Treatment Technology ◽  
Corrosion Properties ◽  
Pvd Coating ◽  
Composite Layers ◽  
Coating Composite

Abstract Magnesium alloys have very interesting physical properties which make them ‘materials of the future’ for tools and machine components in many industry areas. However, very low corrosion and tribological resistance of magnesium alloys hampers the implementation of this material in the industry. One of the methods to improve the properties of magnesium alloys is the application of the solutions of surface engineering like hybrid technologies. In this paper, the authors compare the tribological and corrosion properties of two types of “MgAlitermetalic / PVD coating” composite layers obtained by two different hybrid surface treatment technologies. In the first configuration, the “MgAlitermetalic / PVD coating” composite layer was obtained by multisource hybrid surface treatment technology combining magnetron sputtering (MS), arc evaporation (AE) and vacuum heating methods. The second type of a composite layer was prepared using a hybrid technology combined with a diffusion treatment process in Al-powder and the electron beam evaporation (EB) method. The authors conclude, that even though the application of „MgAlitermetalic / PVD coating” composite layers can be an effective solution to increase the abrasive wear resistance of magnesium alloys, it is not a good solution to increase its corrosion resistance.

scholarly journals The Impact of Stigma and Discrimination on Adherence to Medication amongst People Living with HIV in Tiv Land, North Central Nigeria

2019 ◽  
pp. 1-9
Author(s):  
Godwin Aondohemba Timiun ◽  
Timothy J. Scrase
Keyword(s):  
People Living With Hiv ◽  
Structured Interviews ◽  
Hiv Patients ◽  
Stigma And Discrimination ◽  
Treatment Services ◽  
Adherence To Medication ◽  
Multi Stage ◽  
Living With Hiv ◽  
And Control ◽  
The Impact

In spite the identification of stigma as a factor impeding public utilisation of HIV counselling, testing, and treatment services in Nigeria, gaps still exist in knowledge on the impact of stigma, and discrimination on adherence to medication amongst people living with HIV (PLWH). This study adopted mixed methods to examine the impact of stigma and discrimination on adherence to medication amongst PLWH in Nigeria.  A sample of 1,621 respondents was collected using multi-stage and purposive sampling methods. Structured interviews using questionnaires and in-depth interviews (using a guide) were utilised for data collection. SPSS (version 21) was used for quantitative data analysis while the qualitative data was analysed thematically. There are 46.3% men and 53.7% women respondents. Generally, their income is low, 70.7% are earning less than N25, 000 (approximately $125 USD) per month. Some of the HIV patients are stigmatised. In reaction, they avoid public places, travel long distances away from their immediate community to collect drugs and to avoid been noticed around the centers. They sometimes miss taking drugs regularly as prescribed, suffer depression and die. Stigma and discrimination impede adherence to medication amongst PLHW in Nigeria. More efforts should be made to create awareness to reduce stigma and discrimination of HIV patients, while augmenting their income to meet up with the challenges of adherence to medication. The overall benefits would be enhanced mechanism of HIV prevention, treatment and control in the study area.

scholarly journals Analysis of the criteria of efficiency of work of separators for the field of hydrocarbon raw

2019 ◽  
pp. 114-119
Author(s):  
Valeriy V. Piven ◽  
Vladislav S. Shchelkonogov
Keyword(s):  
Technological Process ◽  
Raw Materials ◽  
Comprehensive Assessment ◽  
Technological Scheme ◽  
Qualitative Composition ◽  
Separation Processes ◽  
Process Flow ◽  
Multi Stage ◽  
Flow Diagrams

Assessment of the quality of separation of hydrocarbon raw during its field preparation is necessary to determine the efficiency of the entire technological process of preparation. The absence of complex criteria for assessing the quality of separation for multi-stage processes does not allow one to obtain unambiguous solutions in justifying the process flow diagrams and equipment for separation. We have analyzed the typical technological scheme of separation of hydrocarbon raw materials and existing criteria for separation processes. It is proposed to use the criterion for a comprehensive assessment of the separation processes of hydrocarbon raw materials, allowing calculating the efficiency of the process, taking into account the possible production of intermediate fractions and their qualitative composition

Система дистанційного моніторингу та керування кліматичними параметрами приміщень в процесі промислового виробництва

2020 ◽  
pp. 19-23
Author(s):  
Ігор Бережний ◽  
◽  
Адріан Наконечний ◽  
Keyword(s):  
Energy Efficiency ◽  
Comparative Analysis ◽  
Technological Process ◽  
Remote Monitoring ◽  
High Speed ◽  
Monitoring And Control ◽  
Remote Monitoring And Control ◽  
The Cost ◽  
And Control ◽  
Communication Lines

Based on the research and comparative analysis of existing systems, an algorithm for remote monitoring and control of the technological process using IoT technologies is proposed and developed. We consider a system with flexible algorithms, which combines different data protocols using Wi-Fi technology, which allows you to use this type of system in any industry safely with high speed, energy efficiency and without the cost of communication lines.

Methods of calculation and testing of gas equipment. Lecture № 6. Part 5. Test method of gas equipment for CNG operation

2020 ◽  
Keyword(s):  
Natural Gas ◽  
Technological Process ◽  
Test Methods ◽  
Test Method ◽  
Schematic Diagram ◽  
Compressed Natural Gas ◽  
Certification Tests ◽  
Gas Cylinder ◽  
And Control ◽  
Gas Supply

The method of testing the gas supply systems of HBA for tightness and strength of connections is described. A schematic diagram of CNG accumulation is presented. Diagrams of test stands for compressed natural gas equipment are presented. A schematic diagram of checking the tightness of a singlefuel compressed natural gas supply system is presented. The technological process of checking the tightness of gas cylinder equipment in production conditions is presented. The technological process of inspection of a highpressure cylinder is given. The scheme of certification tests of a cylindrical CNG gas cylinder is shown. The scheme of certification and control of production of CNG cylinders is given. The diagram for testing and tightness of a twostage compressed natural gas reducer is given. Keywords rules and test methods; leakproofness; certification; singlefuel and dualfuel system; compressed natural gas; test modes; certification tests of the cylinder and gas equipment components; destruction of the cylinder

scholarly journals Electrospinning: A Powerful Tool to Improve the Corrosion Resistance of Metallic Surfaces Using Nanofibrous Coatings

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 350 ◽  
Author(s):  
Pedro J. Rivero ◽  
Deyo Maeztu Redin ◽  
Rafael J. Rodríguez
Keyword(s):  
Surface Engineering ◽  
Good Control ◽  
Self Healing ◽  
Intrinsic Properties ◽  
Functional Coatings ◽  
Metallic Surfaces ◽  
Electrospinning Technique ◽  
Deposition Parameters ◽  
Efficient Alternative ◽  
Fibre Morphology

The use of surface engineering techniques to tune-up the composition of nanostructured thin-films for developing functional coatings with advanced properties is a hot topic within the scientific community. The control of the coating structure at the nanoscale level allows improving the intrinsic properties of the surface compared to bulk materials. A nanodeposition technique with increasing popularity in the field of nanotechnology is electrospinning. This technique permits the fabrication of long and continuous fibres on the micro-nano scale. The good control over fibre morphology combined with its simplicity, cost-effectiveness, easy exploitability and scalability make electrospinning a very interesting tool for technological applications. This review is focused on the use of the electrospinning technique to protect metallic surfaces against corrosion. Polymeric precursors, from natural or biodegradable to synthetic polymers and copolymers can be electrospun with an adequate control of the operational deposition parameters (applied voltage, flow rate, distance tip to collector) and the intrinsic properties of the polymeric precursor (concentration, viscosity, solvent). The electrospun fibres can be used as an efficient alternative to encapsulate corrosion inhibitors of different nature (inorganic or organic) as well as self-healing agents which can be released to reduce the corrosion rate in the metallic surfaces.

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