scholarly journals Recent Developments and Research Issues in Microultrasonic Machining

2011 ◽  
Vol 2011 ◽  
pp. 1-15 ◽  
Author(s):  
Vivek Jain ◽  
Apurbba Kumar Sharma ◽  
Pradeep Kumar
Keyword(s):  
Machine Tool ◽  
Brittle Material ◽  
State Of The Art ◽  
Brittle Materials ◽  
The State ◽  
Research Issues ◽  
Critical Areas ◽  
Recent Developments ◽  
Tool Technology ◽  
Future Work

Demand for micromachining has been on the rise in recent years owing to increasing miniaturization. Production of parts in microscale, especially with brittle materials, is challenging. Ultrasonic micromachining has been gaining popularity as a new alternative in fabrication of such parts. The process gives a machining option for geometrically challenging and/or brittle material parts that are difficult to machine by conventional processes. In the recent years, possibilities have been explored to improve the “Unit Removal” in microultrasonic machining (micro-USM). However, the research in the area is yet to attain momentum. The present paper is an attempt to present the state of the art in the area of micro-USM based on the literature. Developments in the critical areas of the process like machine tool technology, machining tool head, transducers, and precision attainable in the process with challenges have been discussed. Potential research issues have been explored for future work. Possible application areas have been identified.

scholarly journals Recent Developments in Coatings, Gratings, and Reflective Components

1984 ◽  
Vol 79 ◽  
pp. 607-616
Author(s):  
R. R. Shannon
Keyword(s):  
State Of The Art ◽  
New Technology ◽  
The State ◽  
Current Technology ◽  
Large Size ◽  
Incoming Radiation ◽  
Recent Developments ◽  
Electronic Sensors ◽  
Large Primary ◽  
Telescope System

The requirements on gratings and coatings for astronomical use differ from the general industrial requirements primarily in the scale of the components to be fabricated. Telescopes have large primary mirrors which require large coating plants to handle the components. Dispersive elements are driven by the requirement to be efficient in the presence of large working apertures, and usually optimize to large size in order to efficiently use the incoming radiation. Beyond this, there is a “new” technology of direct electronic sensors that places specific limits upon the image scale that can be used at the output of a telescope system, whether direct imagery or spectrally divided imagery is to be examined. This paper will examine the state of the art in these areas and suggest some actions and decisions that will be required in order to apply current technology to the predicted range of large new telescopes.

scholarly journals Bibliographic review on the state of the art of strontium and zinc based regenerative therapies. Recent developments and clinical applications

2019 ◽  
Vol 7 (12) ◽  
pp. 1974-1985 ◽  
Author(s):  
Mirta Jiménez ◽  
Cristina Abradelo ◽  
Julio San Román ◽  
Luis Rojo
Keyword(s):  
Musculoskeletal Disorders ◽  
State Of The Art ◽  
Clinical Applications ◽  
The State ◽  
Tissue Formation ◽  
Promoting Effect ◽  
Recent Developments ◽  
Regenerative Therapies

This review brings up to date the state of the art of strontium and zinc based regenerative therapies, both having a promoting effect on tissue formation and a role inhibiting resorption in musculoskeletal disorders.

Nanostructured Coatings for Tooling Applications

2015 ◽  
Vol 825-826 ◽  
pp. 597-604 ◽  
Author(s):  
Arno Köpf ◽  
Jozef Keckes ◽  
Juraj Todt ◽  
Reinhard Pitonak ◽  
Ronald Weissenbacher
Keyword(s):  
Process Parameters ◽  
State Of The Art ◽  
Nanostructured Coatings ◽  
The State ◽  
Recent Developments

In this contribution the authors will present a short summit of the state of the art in the field of nanostructured coatings and will then emphasise on the most recent developments concerning the possible changes in the coating architecture of CVD AlTiN, which can be achieved by changing some of the process parameters

Modeling Friction Wedges: Part I — The State-of-the-Art

2004 ◽  
Author(s):  
Peter E. Klauser
Keyword(s):  
Vehicle Dynamics ◽  
Software Package ◽  
State Of The Art ◽  
Current Approach ◽  
The State ◽  
Test Cases ◽  
Critical Component ◽  
Technology Center ◽  
Future Work

The friction wedge is a critical component in the three-piece truck. This paper describes the current approach for modeling friction wedges and compares its implementation in the commercially available NUCARS™ and VAMPIRE® vehicle dynamics codes. NUCARS™ is a software package developed by Transportation Technology Center, Inc., while VAMPIRE® is a package developed by AEA Technology plc. Sample results from both codes are presented based on standalone test cases. Shortcomings of the “state-of-the-art” model are described and directions for future work are proposed.

Porous Metals

MRS Bulletin ◽  
1994 ◽  
Vol 19 (4) ◽  
pp. 24-28 ◽  
Author(s):  
Vladimir Shapovalov
Keyword(s):  
Technological Progress ◽  
State Of The Art ◽  
High Energy ◽  
The State ◽  
Porous Metals ◽  
Research Issues ◽  
Honeycomb Structures ◽  
New Research ◽  
Structure Properties

Porous metals are engineered materials; they are designed for special properties. Technological progress necessitates expanding the choices of such materials, making the development of new porous metals a relevant challenge for materials scientists.Although a wealth of information has already been accumulated on these materials, new results are published every year, extending the engineer's capability to manufacture porous metals and revealing their unknown and often unusual properties. This survey describes the state of the art and some recent accomplishments in the field. This article discusses manufacturing practices, structure, properties, and applications of porous metals. Promising new research issues are also highlighted. Materials whose pores were not formed in situ, like honeycomb structures made by high-energy beams etc., are not covered.

scholarly journals Research Issues in Knowledge-Based Configuration

2011 ◽  
pp. 221-236
Author(s):  
D. Jannach
Keyword(s):  
State Of The Art ◽  
The State ◽  
Future Research ◽  
Research Issues ◽  
Knowledge Based ◽  
Novel Approaches

This chapter gives an overview on these current and future research issues in the domain of knowledge-based configuration technology, and thus summarizes the state-of-the-art, recent achievements, novel approaches, and open challenges in the field.

scholarly journals Named entity recognition in texts with the help of part of speech tagging

2018 ◽  
pp. 74-83
Author(s):  
M. Bevza
Keyword(s):  
State Of The Art ◽  
Named Entity Recognition ◽  
Recognition Task ◽  
Entity Recognition ◽  
Named Entity ◽  
Part Of Speech Tagging ◽  
Pos Tagging ◽  
Part Of Speech ◽  
Recent Developments ◽  
Future Work

We analyze neural network architectures that yield state of the art results on named entity recognition task and propose a number of new architectures for improving results even further. We have analyzed a number of ideas and approaches that researchers have used to achieve state of the art results in a variety of NLP tasks. In this work, we present a few architectures which we consider to be most likely to improve the existing state of the art solutions for named entity recognition task and part of speech tasks. The architectures are inspired by recent developments in multi-task learning. This work tests the hypothesis that NER and POS are related tasks and adding information about POS tags as input to the network can help achieve better NER results. And vice versa, information about NER tags can help solve the task of POS tagging. This work also contains the implementation of the network and results of the experiments together with the conclusions and future work.

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