scholarly journals Electrodeposited Biocoatings, Their Properties and Fabrication Technologies: A Review

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 782
Author(s):  
Andrzej Zielinski ◽  
Michal Bartmanski
Keyword(s):  
Electrophoretic Deposition ◽  
Calcium Ions ◽  
Electrolyte Composition ◽  
Cathodic Deposition ◽  
Properties Of Coatings ◽  
Cathodic Electrodeposition ◽  
Advantages And Disadvantages ◽  
Electrodeposited Coatings ◽  
Recent Developments ◽  
State Of Art

Coatings deposited under an electric field are applied for the surface modification of biomaterials. This review is aimed to characterize the state-of-art in this area with an emphasis on the advantages and disadvantages of used methods, process determinants, and properties of coatings. Over 170 articles, published mainly during the last ten years, were chosen, and reviewed as the most representative. The most recent developments of metallic, ceramic, polymer, and composite electrodeposited coatings are described focusing on their microstructure and properties. The direct cathodic electrodeposition, pulse cathodic deposition, electrophoretic deposition, plasma electrochemical oxidation in electrolytes rich in phosphates and calcium ions, electro-spark, and electro-discharge methods are characterized. The effects of electrolyte composition, potential and current, pH, and temperature are discussed. The review demonstrates that the most popular are direct and pulse cathodic electrodeposition and electrophoretic deposition. The research is mainly aimed to introduce new coatings rather than to investigate the effects of process parameters on the properties of deposits. So far tests aim to enhance bioactivity, mechanical strength and adhesion, antibacterial efficiency, and to a lesser extent the corrosion resistance.

AlGaN/GaN HEMTs: RECENT DEVELOPMENTS AND FUTURE DIRECTIONS

2008 ◽  
Vol 18 (04) ◽  
pp. 913-922 ◽  
Author(s):  
SIDDHARTH RAJAN ◽  
UMESH K. MISHRA ◽  
TOMÁS PALACIOS
Keyword(s):  
Field Effect ◽  
High Speed ◽  
Digital Circuits ◽  
Field Effect Transistors ◽  
Rf Power ◽  
Power Performance ◽  
Future Directions ◽  
Recent Developments ◽  
Gan Hemts ◽  
State Of Art

This paper provides an overview of recent work and future directions in Gallium Nitride transistor research. We discuss the present status of Ga -polar AlGaN / GaN HEMTs and the innovations that have led to record RF power performance. We describe the development of N -polar AlGaN / GaN HEMTs with microwave power performance comparable with state-of-art Ga -polar AlGaN / GaN HEMTs. Finally we will discuss how GaN -based field effect transistors could be promising for a less obvious application: low-power high-speed digital circuits.

scholarly journals A Study Wireless Communication Domain

2011 ◽  
pp. 82-86
Author(s):  
Sangram Routray ◽  
Lalit M. Satapathy ◽  
Sanjib k. Nayak
Keyword(s):  
Wireless Communication ◽  
Embedded Systems ◽  
Short Range ◽  
Remote Access ◽  
Wireless Technologies ◽  
Advantages And Disadvantages ◽  
Recent Developments

Wireless communication seem destined to make a large and continuing impact on our lives. Recent developments in wireless technologies provide a new channel for implementation of embedded systems with remote access for mobile and non-mobile products and services. Several wireless technologies are available with their own advantages and disadvantages. This paper examines several available short-range wireless technologies and evaluates them for embedded systems.

Primary Vitrectomy Surgery in Rhegmatogenous Retinal Detachment; Indications and Techniques

2019 ◽  
pp. 197-200
Keyword(s):  
Retinal Detachment ◽  
Visual Loss ◽  
Rhegmatogenous Retinal Detachment ◽  
Vitreoretinal Surgery ◽  
Scleral Buckling ◽  
Primary Vitrectomy ◽  
Advantages And Disadvantages ◽  
Instruments And Techniques ◽  
Vitrectomy Surgery ◽  
State Of Art

Retinal detachment is one of the most important causes of visual loss. Scleral buckling, pneumatic retinopexy, or primary vitrectomy techniques are the state of art treatment approaches for retinal detachment. Novel improvements in instruments and techniques of vitreoretinal surgery have led primary vitrectomy to be more preferable for retinal detachment surgery. Performing primary vitrectomy in selected patients, considering the advantages and disadvantages has a significant impact in terms of prognosis.

Critical Comparison of Structured Contactors for Adsorption-Based Gas Separations

2018 ◽  
Vol 9 (1) ◽  
pp. 129-152 ◽  
Author(s):  
Stephen J.A. DeWitt ◽  
Anshuman Sinha ◽  
Jayashree Kalyanaraman ◽  
Fengyi Zhang ◽  
Matthew J. Realff ◽  
...  
Keyword(s):  
State Of The Art ◽  
System Modeling ◽  
Fixed Bed ◽  
Gas Separations ◽  
Science And Engineering ◽  
Advantages And Disadvantages ◽  
Substantial Problem ◽  
Temperature Swing ◽  
Recent Developments ◽  
Temperature Swing Adsorption

Recent advances in adsorptive gas separations have focused on the development of porous materials with high operating capacity and selectivity, useful parameters that provide early guidance during the development of new materials. Although this material-focused work is necessary to advance the state of the art in adsorption science and engineering, a substantial problem remains: how to integrate these materials into a fixed bed to efficiently utilize the separation. Structured sorbent contactors can help manage kinetic and engineering factors associated with the separation, including pressure drop, sorption enthalpy effects, and external heat integration (for temperature swing adsorption, or TSA). In this review, we discuss monoliths and fiber sorbents as the two main classes of structured sorbent contactors; recent developments in their manufacture; advantages and disadvantages of each structure relative to each other and to pellet packed beds; recent developments in system modeling; and finally, critical needs in this area of research.

scholarly journals Chipless-RFID: A Review and Recent Developments

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3385 ◽  
Author(s):  
Herrojo ◽  
Paredes ◽  
Mata-Contreras ◽  
Martín
Keyword(s):  
Integrated Circuits ◽  
Data Storage ◽  
Low Cost ◽  
Rfid Tags ◽  
Rfid Technology ◽  
Advantages And Disadvantages ◽  
Chipless Rfid ◽  
Recent Developments ◽  
Radiofrequency Identification ◽  
Application Specific

In this paper, a review of the state-of-the-art chipless radiofrequency identification (RFID) technology is carried out. This recent technology may provide low cost tags as long as these tags are not equipped with application specific integrated circuits (ASICs). Nevertheless, chipless-RFID presents a series of technological challenges that have been addressed by different research groups in the last decade. One of these challenges is to increase the data storage capacity of tags, in order to be competitive with optical barcodes, or even with chip-based RFID tags. Thus, the main aim of this paper is to properly clarify the advantages and disadvantages of chipless-RFID technology. Moreover, since the coding information is an important aspect in such technology, the different coding techniques, as well as the main figures of merit used to compare different chipless-RFID tags, will be analyzed.

Recent Advances in Inhaled Formulations and Pulmonary Insulin Delivery Systems

2020 ◽  
Vol 21 (3) ◽  
pp. 180-193 ◽  
Author(s):  
Haofan Liu ◽  
Xiaosong Shan ◽  
Jiaojiao Yu ◽  
Xin Li ◽  
Liandong Hu
Keyword(s):  
Hepatic Metabolism ◽  
Insulin Delivery ◽  
Insulin Administration ◽  
Hypodermic Injection ◽  
Glucose Levels ◽  
Advantages And Disadvantages ◽  
Blood Glucose Levels ◽  
Rapid Action ◽  
Recent Developments

Insulin (INS) therapy played a great role in patients with type 1 and type 2 diabetes to regulate blood glucose levels. Although hypodermic injection was commonly used for insulin delivery, it had some disadvantages such as pain, needle phobia and the risk of infection. Therefore, pulmonary insulin delivery had been developed as an alternative method to overcome the therapeutic challenges in recent years since pulmonary insulin administration showed great improvements in rapid action and circumvention of first-pass hepatic metabolism. This review described the most recent developments in pulmonary insulin administration. Firstly, the structure and physiology of the lung cavity were introduced. Next, the advantages and disadvantages of pulmonary administration were discussed. Then some new dosage forms for pulmonary insulin were investigated including carriers based on surfactants and carriers based on polymers. Finally, innovate insulin inhalers and formulations were also described.

Methods for identification, quantification and characterization of polyhydroxyalkanoates

2016 ◽  
Vol 5 (04) ◽  
pp. 4977 ◽  
Author(s):  
Suchitra Godbole
Keyword(s):  
Process Development ◽  
Quantitative Estimation ◽  
Molecular Weight Determination ◽  
Similar Material ◽  
Storage Material ◽  
Spectrophotometric Methods ◽  
Advantages And Disadvantages ◽  
Recent Developments ◽  
Energy Storage Material

Polyhydroxyalkanoates (PHAs) are the polymers of hydroxyalkanoates that accumulate as a carbon/energy storage material in various microorganisms. PHAs have been attracting considerable attention as biodegradable substitutes for conventional polymers, because of their similar material properties to conventional plastics. A number of review articles on the general features of PHAs, the physiology, genetics and molecular biology, the development of PHAs having novel monomer constituents, production processes, biodegradation of PHAs are available. Recently much effort has been devoted to develop a process for the economical production of PHAs. The isolation, analysis and characterization of PHAs are important factors for any process development. A number of methods have been developed for the analysis of PHAs. This paper is an effort to compile the methods available for the identification, quantitative estimation and characterization of PHAs. The methods described in this paper include- staining reactions, spectrophotometric methods, infrared and FTIR spectroscopy, HPLC, gas chromatography and GC-MS analysis, NMR spectroscopy, flow cytometry and spectrofluorometry, molecular weight determination and thermal analysis. The methods have been discussed with their advantages and disadvantages. Recent developments in the analysis of PHAs have also been discussed.

Mobility Challenges and Management in the Future Wireless Heterogeneous Networks

2011 ◽  
pp. 18-51
Author(s):  
Jianfeng Guan ◽  
Changqiao Xu ◽  
Hongke Zhang ◽  
Huachun Zhou
Keyword(s):  
Heterogeneous Networks ◽  
Mobility Management ◽  
The State ◽  
Heterogeneous Environments ◽  
Advantages And Disadvantages ◽  
Wireless Heterogeneous Networks ◽  
The Future ◽  
State Of Art

The organization of this chapter is as follows: It begins by analyzing the mobility challenges under the multi-accessing wireless heterogeneous environments. Next the chapter gives a brief introduction of the mobility management. Afterwards it introduces the state-of-art of the mobility management solutions and describes the respective approaches and compares their advantages and disadvantages. The last section concludes this chapter.

Recent Developments in the Electrophoretic Deposition of Carbon Nanomaterials

2021 ◽  
pp. 113-137
Author(s):  
Artur P. Terzyk ◽  
Monika Zięba ◽  
Stanisław Koter ◽  
Emil Korczeniewski ◽  
Wojciech Zięba ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Carbon Nanomaterials ◽  
Recent Developments
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