A review of the advances in composites/nanocomposites for triboelectric nanogenerators

2022 ◽  
Author(s):  
Renyun Zhang ◽  
Jonas Ortegren ◽  
Magnus Hummelgard ◽  
Martin Olsen ◽  
Henrik A Andersson ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Mechanical Strength ◽  
Google Scholar ◽  
Future Studies ◽  
Material Development ◽  
Triboelectric Nanogenerators

Abstract Material development is essential when studying triboelectric nanogenerators (TENGs). This importance is because the performance of TENGs are highly dependent on the properties of the utilized triboelectric materials. To obtain more specific properties, composites have been developed that combine the features of their components. According to Google Scholar, 55% of published papers related to triboelectric nanogenerators have utilized or mentioned composites. This number is 34.5% if one searches with the keyword nanocomposites instead of composites. The importance of composites is because they can exhibit new dielectric properties, better mechanical strength, enhanced charge affinities, etc. Therefore, the development of new composites has great importance in TENG studies. In this paper, we review the production of nanocomposites, the types of nanocomposites, and their application in TENG studies. This review gives an overview of how nanocomposites boost the performance of TENGs and provides guidance for future studies.

Material Development Based on Digital Storytelling Activities and Assessment of Students’ Views

2017 ◽  
Vol 6 (1) ◽  
pp. 54
Author(s):  
Ozlem Ayvaz Tunc
Keyword(s):  
Digital Storytelling ◽  
Fine Arts ◽  
Reliability Assessment ◽  
Structured Interviews ◽  
Spring Semester ◽  
Future Studies ◽  
Material Development ◽  
Reliability Method ◽  
Academic Year

<span lang="EN-US">This study was designed as a case study. The study was conducted in Anatolian Fine Arts High School during the spring semester of 2014-2015 academic year. The sample of the study consisted of a total of 10 students from 9th and 10th grades who voluntarily participated in the study. Semi-structured interviews were conducted with the 10 students named at the end of every activity. Assure instructional design model was used while designing digital storytelling activities. The data obtained from the study were analyzed through thematic analysis based on qualitative research method. Reliability method suggested by Miles and Huberman was used for reliability assessment of the study. The reliability of the thematic coding of the results was found to be 0,95 as a result of assessments. Based on the findings that digital storytelling has multidisciplinary interaction competence, it is thought that it will be appropriate to conduct future studies in different schools and fields.  </span>

scholarly journals Google Scholar Retrieves Twice as Many Relevant Citations as PubMed and Provides Greater Full-Text Access for Quick, Clinical Nephrology Searches

2014 ◽  
Vol 9 (1) ◽  
pp. 36 ◽  
Author(s):  
Diana K. Wakimoto
Keyword(s):  
Systematic Reviews ◽  
Full Text ◽  
Relevant Literature ◽  
Google Scholar ◽  
Reference Standard ◽  
Future Studies ◽  
Clinical Nephrology ◽  
Clinical Literature ◽  
Standard Set ◽  
Medical Disciplines

Objective – To compare recall and precision of results retrieved by searches in PubMed and Google Scholar for clinical nephrology literature. Design – Survey questionnaire, comparative. Setting – Canada. Subjects – Practicing nephrologists with average age of 48 years and who have practiced nephrology for an average of 15 years. Methods – The researchers identified 100 systematic reviews in renal therapy published between 2001 and 2009. The primary studies cited in the systematic reviews served as the reference standard for relevant articles; 1,574 unique citations were identified and used to measure recall and precision. The researchers created a unique clinical question from each of the objective statements of systematic reviews and sent one question to a random sample of practicing nephrologists to determine the search strings they would use to search for clinical literature; the researchers collected 100 usable responses. Using the search string in both Google Scholar and PubMed, the researchers analyzed the first 40 retrieved results in each for recall of relevant literature and precision. The researchers also analyzed the availability of full-text articles in each database. A pilot study to test the methodology preceded the main study. Results – Google Scholar’s recall for the first 40 records was 21.9% and PubMed was 10.9%. Each database contained 78% of the relevant literature/reference standard set from the systematic reviews. However, 15% of the articles were in neither database. Precision results were similar (7.6% for Google Scholar and 5.6% for PubMed). Google Scholar had more full-text available at 15% of articles versus 5% for PubMed. Google Scholar and PubMed had similar numbers of relevant articles when all retrieved records were analyzed, but Google Scholar still provided more access to free full-text articles. Conclusion – Google Scholar provides better recall and provides more access to full-text than PubMed; however, search strings provided by nephrologists used in both databases failed to retrieve 80% of relevant articles. Therefore improving nephrologists’ ability to effectively search could enhance their ability to implement research in practice helping patients. The researchers suggest future studies should be conducted to determine the generalizability of the findings on recall and precision in other medical disciplines.

scholarly journals Technical Feasibility of TachoSil Application on Esophageal Anastomoses

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Leonie Haverkamp ◽  
Jelle P. Ruurda ◽  
Richard van Hillegersberg
Keyword(s):  
Mechanical Strength ◽  
Anastomotic Leakage ◽  
Total Gastrectomy ◽  
Gastrointestinal Surgery ◽  
Laparoscopic Total Gastrectomy ◽  
Human Fibrinogen ◽  
Technical Feasibility ◽  
Future Studies ◽  
Patch Application ◽  
Upper Gastrointestinal

Purpose. Sealing esophageal anastomoses with a sealant patch (TachoSil) containing human fibrinogen and thrombin may improve mechanical strength. The aim was to evaluate the technical feasibility of the application of a sealant patch in upper gastrointestinal surgery.Methods. In total 15 patients, 18–80 years old, undergoing thoracolaparoscopic esophagectomy with esophagogastrostomy or laparoscopic total gastrectomy with esophagojejunostomy was included. Different techniques of anastomotic TachoSil patch application were tested and recorded on video.Results. TachoSil was successfully applied to the esophagogastrostomy (n=11) and to the esophagojejunostomy (n=4). A median of 2 (1–6) attempts was necessary to reach successful application. The median duration was 7 (3–26) minutes before successful application was accomplished. The best technique in esophagectomy was the application of TachoSil with the use of 2 cellophane sheets. For total gastrectomy, the patch was folded into a harmonica shape and wrapped around the esophagojejunostomy. Although not significant, the number of attempts and time to success showed a decreasing trend along with the increased experience.Conclusion. Application of TachoSil as a sealant of esophageal anastomoses was technically feasible. Future studies may investigate the value of TachoSil application on the prevention of anastomotic leakage.

scholarly journals Boosting performances of triboelectric nanogenerators by optimizing dielectric properties and thickness of electrification layer

RSC Advances ◽  
2020 ◽  
Vol 10 (30) ◽  
pp. 17752-17759 ◽  
Author(s):  
Xiaofang Kang ◽  
Chongxiang Pan ◽  
Yanghui Chen ◽  
Xiong Pu
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
High Dielectric Constant ◽  
Filler Content ◽  
Triboelectric Nanogenerator ◽  
Triboelectric Nanogenerators ◽  
High Dielectric

Enhanced output performances of a triboelectric nanogenerator (TENG) are achieved by optimizing the high-dielectric-constant filler content in the electrification layer and decreasing its thickness.

scholarly journals Effects of particle size of dielectric fillers on the output performance of piezoelectric and triboelectric nanogenerators

2021 ◽  
Author(s):  
Xiao Meng ◽  
Zhuo Zhang ◽  
Dabin Lin ◽  
Weiguo Liu ◽  
Shun Zhou ◽  
...  
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Output Voltage ◽  
Nanocomposite Films ◽  
Piezoelectric Composite ◽  
Portable Electronics ◽  
Output Performance ◽  
Triboelectric Nanogenerators ◽  
Electrical Output

AbstractRecently, piezoelectric/triboelectric nanogenerators based on piezoelectric composite materials have been intensively studied to achieve high electrical output performance. In this work, flexible BaTiO3 (BT)/PDMS nanocomposite films with various sizes and concentrations were fabricated and used as the nanogenerators. The influence of dielectric properties on the electrical output of nanogenerators was studied as well as the structure of the composites. The dielectric constant increased from 6.5 to 8 with the concentration of BT nanoparticles and decreased with the frequency from 102 to 106 Hz. Furthermore, the dielectric constant showed 11% decrease with the temperature range from 30 to 180 °C. It was found that the concentration of BT nanoparticles has promoted the electrical output of nanogenerators. The output voltage and current are all enhanced with the BT nanoparticles, which reached 200 V and 0.24 °A in TENG with 40 wt% BT nanoparticles, respectively. The selected device exhibited the power of 0.16 mW and employed to demonstrate its ability to power wearable/portable electronics by lighting the LEDs.

Preparation of poly-p-phenylenebenzobisoxazole (PBO) fibrillated pulp and dielectric properties of carbon fiber/PBO wet-laid nonwoven fabric

2017 ◽  
Vol 88 (13) ◽  
pp. 1559-1568 ◽  
Author(s):  
Jingjing Bai ◽  
Hao Wang ◽  
Yi Wang ◽  
Jian Hu
Keyword(s):  
Dielectric Properties ◽  
Carbon Fiber ◽  
Mechanical Strength ◽  
Reflection Loss ◽  
Complex Permittivity ◽  
Nonwoven Fabric ◽  
Electromagnetic Properties ◽  
Optimum Thickness ◽  
Permittivity And Permeability ◽  
Different Content

A method to prepare a kind of wet-laid nonwoven fabric that can be used in microwave absorbing honeycomb is proposed. It was prepared through a papermaking process with carbon fiber (CF) and poly-p-phenylenebenzobisoxazole (PBO) fibrillated pulp. Fibrillated PBO pulp has a large surface area and lots of micro-fibrils which is beneficial for the uniformity and mechanical strength of the wet-laid nonwoven fabric. The electromagnetic properties and absorbing performances of the wet-laid nonwoven fabric with different content of CF were compared. The results showed that the complex permittivity increased when the content of the CF increased, and then decreased when the content was higher than 10 wt%. The resistivity measured by four probe testers decreased with the increase of the content of CF. Calculated by the measured complex permittivity and permeability, the CF/PBO wet-laid nonwoven fabric had a lowest reflection loss of -27.60 dB at a content of 20 wt%, with an optimum thickness of 1.72 mm.

Academic production about the Bauschinger Effect in steels: a bibliometric study between 1990 and 2021

2021 ◽  
Author(s):  
FELIPE FARAGE DAVID ◽  
Luan Marcel Costa Vasconcelos ◽  
Frank de Mello Liberato ◽  
Adilson Rodrigues da Costa
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Deleterious Effect ◽  
Bauschinger Effect ◽  
Bibliometric Study ◽  
Future Studies ◽  
Academic Production ◽  
Methodological Procedures

he Bauschinger Effect is a phenomenon that occurs in metals to reduce mechanical strength and increase ductility. It is generally considered a deleterious effect on the mechanical properties of steel. In this context, the objective of this paper is to present a bibliometric study, to demonstrate the evolution of research on this effect and the main methodologies used to characterize this metallurgical phenomenon in steels. For this, methodological procedures were followed from the survey of three hundred and seventy publications, in national and international journals related to the theme in the period between 1990 to 2021. Then, the data found were arranged in spreadsheets, to identify the main methodologies and results, serving as a basis for the analysis of the general research scenarios regarding the Bauschinger Effect in steels, for deepening in future studies.

scholarly journals Depression in Post Disaster Societies: A Systematic Review

2021 ◽  
Vol 14 (3) ◽  
pp. 227-233
Author(s):  
Reza Fithriy Insaniy ◽  
Atika Jatimi ◽  
Maulidiyah Junnatul Azizah Heru ◽  
Zainal Munir
Keyword(s):  
Mental Health ◽  
Systematic Review ◽  
Systematic Reviews ◽  
Google Scholar ◽  
Future Studies ◽  
Post Traumatic ◽  
Meta Analyses ◽  
Health Burdens ◽  
Post Disaster

  Introduction: Disaster increases the risk of depression in individuals one to six years after the event. Objective:. This paper describes depression in post-disaster societies. Method: This study was a systematic review. Database searches included Google Scholar and Proquest, with the keywords post-traumatic, depression, and disaster. The article's criteria were in English, published in 2016-2020, and used (CES-D) questionnaire. This systematic review was based on Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). Results: This study used 15 articles meeting the criteria. Analysis of fifteen articles showed that individuals had mental health burdens after a disaster occurs. One of them was depression.  Conclusion: There is a depression in post-disaster societies. Future studies should explore the correlation between PTSD and depression after a disaster.

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