scholarly journals A Systematic Approach for Developing 3D High-Quality PDMS Microfluidic Chips Based on Micromilling Technology

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 6
Author(s):  
Amin Javidanbardan ◽  
Ana M. Azevedo ◽  
Virginia Chu ◽  
João P. Conde
Keyword(s):  
Systematic Approach ◽  
High Surface ◽  
Cost Effective ◽  
Average Surface Roughness ◽  
Microfluidic Chips ◽  
High Quality ◽  
High Surface Quality ◽  
Design Flexibility ◽  
New Strategies

In recent years, there has been an increased interest in exploring the potential of micro-and mesoscale milling technologies for developing cost-effective microfluidic systems with high design flexibility and a rapid microfabrication process that does not require a cleanroom. Nevertheless, the number of current studies aiming to fully understand and establish the benefits of this technique in developing high-quality microsystems with simple integrability is still limited. In the first part of this study, we define a systematic and adaptable strategy for developing high-quality poly(methyl methacrylate) (PMMA)-based micromilled structures. A case study of the average surface roughness (Ra) minimization of a cuboid column is presented to better illustrate some of the developed strategies. In this example, the Ra of a cuboid column was reduced from 1.68 μm to 0.223 μm by implementing milling optimization and postprocessing steps. In the second part of this paper, new strategies for developing a 3D microsystem were introduced by using a specifically designed negative PMMA master mold for polydimethylsiloxane (PDMS) double-casting prototyping. The reported results in this study demonstrate the robustness of the proposed approach for developing microfluidic structures with high surface quality and structural integrability in a reasonable amount of time.

Recent Patents on Detection Device of Surface Defects on Bearing Balls

2021 ◽  
Vol 14 ◽  
Author(s):  
Chengyi Pan ◽  
Junhong Tang ◽  
Guanqun Cao ◽  
Bingtao Hu
Keyword(s):  
Surface Defects ◽  
Detection Efficiency ◽  
High Surface ◽  
Detection Accuracy ◽  
High Quality ◽  
High Surface Quality ◽  
Existing Problems ◽  
Advantages And Disadvantages ◽  
Surface Detection ◽  
Scope Of Application

Background: With the continuous pursuit of high-quality and high-precision bearings in industrial production, the processing accuracy of bearing balls is increasing, and high surface quality has become the most basic requirement for high-quality bearing balls. Studying the working principle of detection device of surface defects on bearing balls is beneficial to improve the surface accuracy of bearing balls and the quality of bearings. Objective: To meet the increasing requirements for measurement accuracy and efficiency of surface detection on bearing balls, the devices and methods of surface detection on bearing balls have been improved constantly. Methods: This paper reviews various representative patents related to the detection device of surface defects on bearing balls. The advantages and disadvantages of the patents are analyzed. Results: Through tracing the characteristics of different types of the detection device of surface defects on bearing balls, the main existing problems in the current are concluded and analyzed, such as low detection accuracy, low detection efficiency, and limited scope of application, etc. The future development of patents on detection device of surface defects on bearing balls is discussed. Conclusion: The optimization and development of detection device of surface defects on bearing balls are beneficial to improve the detection accuracy and efficiency of surface defects on bearing balls, and are conducive to expand the scope of application of the detection devices. More related patents on detection device of surface defects on bearing balls will be invented.

Scanning Micro-Electrochemical Machining Process for V-Shaped Grooves

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Hao Zhong ◽  
Hao Tong ◽  
Zhiqiang Wang ◽  
Yong Li ◽  
Yubin Pu
Keyword(s):  
Electrical Discharge Machining ◽  
High Surface ◽  
Electrochemical Machining ◽  
Machining Process ◽  
Tool Electrode ◽  
Microfluidic Chips ◽  
Long Distance ◽  
High Surface Quality ◽  
Micro Electrical Discharge Machining ◽  
The Given

Abstract Microstructures determine flow properties of microfluidic chip. Micromold forming is an effective method to realize mass manufacturing of microfluidic chips. This requires to machine some kind of special microstructure of high surface quality on a metal/alloy workpiece. Micro V-shaped grooves are the typical microstructures of the chip micromolds used for controlling microfluid or weld packaging. In this research, a scanning micro-electrochemical machining (ECM) process of V-shaped grooves is proposed using a tool electrode fabricated by micro–electrical discharge machining (EDM) on-machine. Theoretical and experimental research was conducted for achieving the V-shaped grooves with a given angle on die steel. A long-distance V-shaped groove with the given angle of 67 deg and the depth of 125 μm was successfully machined.

scholarly journals AYURVEDIYA APPROACH FOR MANAGEMENT OF ULCERATIVE COLITIS : A CASE STUDY

2021 ◽  
Vol 9 (06) ◽  
pp. 532-535
Author(s):  
Piparvadiya R. ◽  
◽  
Sasane P.U ◽  
Keyword(s):  
Ulcerative Colitis ◽  
Inflammatory Bowel Disease ◽  
Signs And Symptoms ◽  
Cost Effective ◽  
Burning Sensation ◽  
Unknown Etiology ◽  
High Morbidity ◽  
High Quality ◽  
Inflammatory Bowel

Ulcerative Colitis (UC) is a subtype of inflammatory bowel disease with unknown etiology, inflammatory disease that affects the colon. In Ayurveda, on the basis of signs and symptoms of Raktatisara can be compared with ulcerative colitis. Etiopathogenesis of Raktatisara in relation to ulcerative colitis by going through Ayurveda texts. due to its high morbidity and mortality. Ayurveda described Raktatisara, which has symptoms similar to ulcerative colitis i.e. Sarakta-mala-pravrutti (rectal bleeding with mucus), Shoola (~pain in abdomen), Gudapaaka (~burning sensation in rectum), Dourbalya (Generalised weakness) and Trishna (~excessive thirst). A diagnosed case of Ulcerative colitis with Ayurveda management was discussed here. In this case study we used some Ayurvedic formulations and Piccha basti, which give us high quality results and the treatment is safe and cost effective.

Development of a decision support tool for sustainable renovation – a case study

2016 ◽  
Vol 34 (1) ◽  
pp. 3-11 ◽  
Author(s):  
Linus Malmgren ◽  
Stefan Elfborg ◽  
Kristina Mjörnell
Keyword(s):  
Design Methodology ◽  
Energy Use ◽  
Systematic Approach ◽  
Decision Support Tool ◽  
Cost Effective ◽  
Social Benefits ◽  
Content Type ◽  
Support Tool ◽  
Sustainability Criteria

Purpose – Building owners are encouraged to reduce the energy consumption both in order to contribute to national energy saving goals and to reduce the costs of heating and operation of buildings. However, it is important to pursue the most optimal strategy to achieve cost-effective energy use while maintaining other values. Building managers often do not have the time or expertise to make a proper evaluation of the available options, hence there is a need for practical methodologies for evaluation of renovation alternatives. The paper aims to discuss these issues. Design/methodology/approach – Renobuild, a systematic approach for evaluating renovation alternatives based on sustainability criteria are under development. It aims to compare renovation alternatives from an environmental, economic and social perspective. To verify the methodology it has been used to evaluate different renovation alternatives for a multi-family apartment building in Sweden. Findings – The study showed that building managers are provided with a clear comparison between different renovation alternatives from a sustainability perspective. Using Renobuild or similar methodologies may highlight renovation measures which marginally increases the investments, but can lead to significant environmental and social benefits. Research limitations/implications – So far the methodology has only been tested on a limited number of buildings in Sweden. More buildings will need to be tested for further verification. Originality/value – Not many tools or methodologies exist which address several aspects of sustainability. Renobuild is a practical methodology that can help building owners to increase focus on sustainability.

The Formability and Elongation of Aluminum Alloys AA5083 and AA3003 for Micro-Truss Sandwiches Manufacturing

2020 ◽  
Vol 38 (9A) ◽  
pp. 1396-1405
Author(s):  
Arwa F. Tawfeeq ◽  
Matthew R. Barnett
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Cost Effective ◽  
Tensile Tests ◽  
Truss Structures ◽  
High Quality ◽  
Trade Off ◽  
Clad Layer ◽  
Higher Temperature ◽  
Different Shapes

The development in the manufacturing of micro-truss structures has demonstrated the effectiveness of brazing for assembling these sandwiches, which opens new opportunities for cost-effective and high-quality truss manufacturing. An evolving idea in micro-truss manufacturing is the possibility of forming these structures in different shapes with the aid of elevated temperature. This work investigates the formability and elongation of aluminum alloy sheets typically used for micro-truss manufacturing, namely AA5083 and AA3003. Tensile tests were performed at a temperature in the range of 25-500 ○C and strain rate in the range of 2x10-4 -10-2 s-1. The results showed that the clad layer in AA3003 exhibited an insignificant effect on the formability and elongation of AA3003. The formability of the two alloys was improved significantly with values of m as high as 0.4 and 0.13 for AA5083 and AA3003 at 500 °C. While the elongation of both AA5083 and AA3003 was improved at a higher temperature, the elongation of AA5083 was inversely related to strain rate. It was concluded that the higher the temperature is the better the formability and elongation of the two alloys but at the expense of work hardening. This suggests a trade-off situation between formability and strength. 

Factor Analysis among the variables relating to purpose of using social media websites and nonacceptance of social media in recruitment

2020 ◽  
pp. 245-248
Keyword(s):  
Social Media ◽  
Factor Analysis ◽  
Social Science Research ◽  
Cost Effective ◽  
Science Research ◽  
Recruitment Strategies ◽  
Job Seeking ◽  
Hiring Process ◽  
To Come ◽  
New Strategies

In the era of Globalization, advancement of technology and stiff competition, particularly, in the I.T. Industry, companies have to adopt new H.R. strategies and practices so as to constantly evolve and grow. In this context, existing recruitment strategies have to be replaced by new strategies. Many companies are now extensively depending on the internet to connect to larger audiences globally. Organizations are in a position to attract profiles, resumes from potential candidates by announcing their vacancies on their own websites. E-recruitment is evoking interest among the companies typically over the last few years. The spread of information technology and growth of Internet has paved way for companies willing to hunt for talent on the job seeking websites. In the years to come, social networking will soon be an indispensable part of the hiring process. It is cost effective, does not require setting up an office and forms an effective tool for recruiters. The main purpose of this study was to understand the application of factor analysis in social science research and to reduce a large number of variables into manageable smaller factors for further analysis of the employers’ perception on social media recruitment with reference to the I.T. Sector in Bangalore.

scholarly journals Using the Google™ Search Engine for Health Information: Is There a Problem? Case Study: Supplements for Cancer

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Hannah C Cai ◽  
Leanne E King ◽  
Johanna T Dwyer
Keyword(s):  
Health Information ◽  
Search Engine ◽  
Information Quality ◽  
Nutrition Information ◽  
High Quality ◽  
Search Results ◽  
Health And Nutrition ◽  
Quality Rating

ABSTRACT We assessed the quality of online health and nutrition information using a Google™ search on “supplements for cancer”. Search results were scored using the Health Information Quality Index (HIQI), a quality-rating tool consisting of 12 objective criteria related to website domain, lack of commercial aspects, and authoritative nature of the health and nutrition information provided. Possible scores ranged from 0 (lowest) to 12 (“perfect” or highest quality). After eliminating irrelevant results, the remaining 160 search results had median and mean scores of 8. One-quarter of the results were of high quality (score of 10–12). There was no correlation between high-quality scores and early appearance in the sequence of search results, where results are presumably more visible. Also, 496 advertisements, over twice the number of search results, appeared. We conclude that the Google™ search engine may have shortcomings when used to obtain information on dietary supplements and cancer.

scholarly journals Differences in echocardiography interpretation techniques among trainees and expert readers

2021 ◽  
Author(s):  
David Roy Anderson ◽  
Sarah Blissett ◽  
Patricia O’Sullivan ◽  
Atif Qasim
Keyword(s):  
Diagnostic Accuracy ◽  
Systematic Approach ◽  
Qualitative Case Study ◽  
First Year ◽  
Educational Tool ◽  
Thought Processes ◽  
Advanced Imaging ◽  
Multiple Images ◽  
Novice Readers

Abstract Background Trainees learn transthoracic echocardiogram (TTE) interpretation through independently completing and reviewing selected portions of the study with experts. The diagnostic accuracy of novice TTE interpretation is known to be low and schema for reading TTEs systematically are lacking. The purpose of our study is to identify techniques experts use while reading TTEs which could be used to more effectively teach novice readers. Methods We performed a prospective qualitative case study to observe how experts and trainees interpret TTEs in an academic institution using a concurrent think aloud (CTA) method. Three TTEs of intermediate complexity were given to 3 advanced imaging fellows, 3 first year fellows and 3 expert TTE readers Participants filled out a report while reading and described aloud their thought processes. Sessions were video and audiotaped for analysis. Results Experts and advanced fellows used specific techniques that novices did not including: previewing studies, reviewing multiple images simultaneously, having flexibility in image review order and disease coding, and saving hardest elements to code for the end. Direct observation of TTE reading informed trainee inefficiencies and was a well-received educational tool. Conclusions In this single centered study we identified several unique approaches experts use to interpret TTEs which may be teachable to novices. Although limited in generalizability the findings of this study suggests that a more systematic approach to TTE interpretation, using techniques found in experts, might be of significant value for trainees. Further study is needed to evaluate teaching practices at other institutions and to assess whether implementation of these techniques by novices improves can improve their diagnostic accuracy and efficiency of reading at an earlier stage in their training.

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