scholarly journals Functional Polymer Hybrid Nanocomposites Based on Polyolefins: A Review

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1475
Author(s):  
Sandra Paszkiewicz ◽  
Krzysztof Pypeć ◽  
Izabela Irska ◽  
Elzbieta Piesowicz

For the last twenty years, polymer hybrid nanocomposites have enjoyed unflagging interest from numerous scientific groups and R&D departments, as they provide notable enhancement of properties, even at low nanofillers’ content. Their performance results from many factors, the most important of which is the uniform distribution in the entire volume of the matrix, that still is very challenging, but is the right choice of two types of nanoparticles that can lead to an increase of dispersion stability and even more uniform distribution of fillers. The incorporation of two types of nanofillers, especially when they differ in aspect ratio or chemical nature, allows to additively reduce the price of the final composite by replacing the more expensive filler with the cheaper one, or even synergistically improving the properties, e.g., mechanical, thermal, and barrier, etc., that can extend their usage in the industry. Despite numerous review papers on nanocomposites, there is no review on how the introduction of a hybrid system of nanofillers affects the properties of polyolefins, which are the most commonly used engineering plastics. This review deeply focuses on the structure–properties relationship of polyolefins-based hybrid nanocomposites, especially based on two types of polyethylenes (low-density polyethylenes (LDPE) and high-density polyethylenes (HDPE)) and polypropylene.

2012 ◽  
Vol 4 (1) ◽  
Author(s):  
Julieta B. Tendero

The English language is an instrument to acquire newknowledge in science, mathematics, humanities and social sciences since the world of knowledge in these areas is generally available in English. Hence, it is being maintained and continuously studied. This study investigated the relationship of students’ hemispheric dominance with English language performance and creativity levels in the context of 423 students randomly chosen from the freshmen population of the thirteen colleges at the Western Mindanao State University, Philippines. For this end, the study employed Descriptive - Correlation Method through which the respondents were asked to complete the six tests, namely: the Hemispheric Dominance Test, the Listening and Reading Comprehension Tests, the Speaking and Writing Skill Tests, and the Torrance Test of Creative Thinking – Figural Form B, Research Edition. Pearson r results revealed that correlation coefficients of -.0.13 between hemispheric dominance and language performance and 0.011 between the former and creativity were not significant at p< .05. This led to the conclusion that the respondents’ hemispheric dominance was not significantly related to their English language performance and their creativity level. Generally, the left-brained, the right-brained or the whole-brained students may be good or poor in the language and in the creativity tests. Keywords - Educational Psychology, hemispheric dominance, leftbrained, right-brained, whole-brained, English language performance, receptive skills, productive skills, creativity level, descriptive research, Zamboanga City, Philippines


2019 ◽  
Vol 1 ◽  
pp. 1-2
Author(s):  
Qifan Huang ◽  
Akiyo Kobayashi

<p><strong>Abstract.</strong> The goal of this research is to apply diagrams to environmental color studies. The experience of environmental color is not only visual experience, but also the relationship of the color and the form of the object, the material, the place, the human perception experience. Diagrams records these factors along with the human perception experiences. These diagrams make it possible to study and analyze environmental color more deeply and more easily. In this paper, we first reviewed the "case studies of environmental color workshops" and "theory of information processing by rearranging matrix of Jacques Bertin" which are related to this research. Next, we conducted an environmental color workshop and evaluated the application of diagrams at workshop by students and experts (design teachers and designers). As a result, we confirmed that the diagrams proposed by us are effective for the environmental color workshop. In particular, it was confirmed that these diagrams are effective for group discussion (analysis).</p><p>The workshop was held at the South China University of Technology (Guangzhou, China) on October 14 – October 17, 2016 (Figure.1). The participants were 5 students. First, students walked along a path near the natural lake in the campus and recorded the observed color objects and their perception experiences. Next, the students (A, B, C, D, E) entered the observation results into the matrix type diagram (a) (Figure.2). In diagram (a), the colors observed by each student were displayed on the left side of the observation route, and the photographs of the color objects, the perception experiences on the color objects, and the landscape photographs of the observation place were arranged on the right side of the observation route. Next, according to Jacques Bertin's theory (visual variables and rearrangement of the matrix), diagram (a) was transformed into diagram (b) (Figure.3) and group discussion and information analysis were carried out. In diagram (b), color objects are represented as "rows", and various attributes of color objects as "columns". The attributes of color objects are the keywords extracted from the "perception experiences for color objects" in diagram (a). In the notation of visual variables, ordinary impression was displayed as gray dot, good impression was displayed as orange dot, bad impression was indicated as blue dot, and the number of observers was indicated by the size of the dot. Looking at Figure.3-left, the most common thing is finding color objects by "brightness", and the number of observers who recorded the "brightness" of bicycle is the largest. By rearranging the matrix in diagram (b), we found that the color objects can be divided into "gray", "white" and "yellow" (Figure.3-middle), there were many good impressions for "yellow and white (flowers)", and there were many bad impressions for "gray and white (street lights)" (Figure.3-right).</p>


Author(s):  
Mohamad Alsaadi ◽  
Bashar Younus ◽  
Ahmet Erklig ◽  
Mehmet Bulut ◽  
Omer Bozkurt ◽  
...  

The influence of various graphene nano-platelets (GNPs) content on the tensile, flexural and Charpy impact characteristics of carbon, Kevlar and hybrid carbon/Kevlar fibers reinforced epoxy matrix composites was investigated. Both of composite configurations as carbon and Kevlar at outer and core skins were experimentally tested. The SEM images for flexural specimens were taken to observe the adhesion mechanism of GnPs particles with fiber/epoxy system. It is found that hybridization with Kevlar layers is contributed a positive effect on the hybrid carbon/Kevlar laminate structures in terms of tensile, flexural and impact behaviour. The incorporation of GnPs particles in hybrid and non-hybrid composite samples results in significant improvements in tensile, flexural and impact properties, and the greatest improvement occurs within the GnPs particle content of 0.1 and 0.25 wt%, indicating that the interfacial bonding between the matrix and the fibers is better due to the large surface area of the GnPs and the good entanglement between the GnPs layers and the matrix chains. The samples of impact test are experimented for edgewise and flatwise directions.


Neurosurgery ◽  
1988 ◽  
Vol 23 (6) ◽  
pp. 770-773 ◽  
Author(s):  
Masahiko Udzura ◽  
Hiroo Kobayashi ◽  
Yoshio Taguchi ◽  
Hiroaki Sekino

Abstract A 54-year-old man with a right hemiparesis was found to have an intrasellar intercarotid communicating artery associated with agenesis of the right internal carotid artery. Magnetic resonance imaging (MRI) studies demonstrated the spatial relationship of the anomalous artery to the surrounding structures, thus suggesting an embryonic enlargement of the capsular artery as a source of this anomalous artery.


2009 ◽  
Vol 22 (2) ◽  
pp. 225-249 ◽  
Author(s):  
JÖRG KAMMERHOFER

AbstractHans Kelsen is known both as a legal theorist and as an international lawyer. This article shows that his theory of international law is an integral part of the Kelsenian Pure Theory of Law. Two areas of international law are analysed: first, Kelsen's coercive order paradigm and its relationship to the bellum iustum doctrine; second, the Kelsenian notion of the unity of all law vis-à-vis theories of the relationship of international and municipal law. In a second step, the results of Kelsenian general legal theory of the late period – as interpreted and developed by the present author – are reapplied to selected doctrines of international law. Thus is the coercive order paradigm resolved, the unity of law dissolved, and the UN Charter reinterpreted to show that the concretization of norms as positive international law cannot be unmade by a scholarship usurping the right to make law.


Polymer ◽  
2015 ◽  
Vol 63 ◽  
pp. 222-229 ◽  
Author(s):  
F. Piscitelli ◽  
G.G. Buonocore ◽  
M. Lavorgna ◽  
L. Verdolotti ◽  
S. Pricl ◽  
...  

2021 ◽  
Vol 13 (1) ◽  
pp. 17-25
Author(s):  
Nur Maimun ◽  
Arnawilis ◽  
Cindy Feby Fayza ◽  
Nur Asikin

Patient as service users have right and obligations to be hospitalized and patients also have the right to medical information in receiving medical practice services. This study aims to determine the relationship between patient attitudes towards the rights and obligations of being hospitalized in the hospital Pekanbaru Medical Center (PMC). This research method using observational analytic method with cross sectional design. The total sample used in this study 107 sample were taken as simpel random sampling. Chi square test is used to determine the relationship between variables. The data were processed using SPSS statistical software and analyzed using univariate and bivariate analyzes. Of the result obtained of the study namely the relationship between patient attitude to the rights and obligations of patient with chi-suare obtained pvalue 0.016 (<0,05), the relationship of attitude patients to the rights and obligations of choosing a doctor and class of patient care with chi-square obtained pvalue 0,070 (<0,05), the relationship of patient attitudes to the right and obligations of confidentiality of disease by inpatient medical staff with chi-square obtained pvalue 0,000 (<0,05), the relationship of patient attitudes to the rights and obligations of consent to the patient treatment with chi-square obtained pvalue 0,000 (<0,05), the relationship of patient attitudes to the right and obligation of patient safety with chi-square obtained pvalue 0,000 (<0,05), the relationship between patient attitudes towards the right and obligations of patient safety with chi-square obtained pvalue 0,000 (<0,05). Suggestions in order to protect what has been achieved in this case is his ability as effort of service is getting better in the future Keyword : Attitudes of patient, Rights and Obligations inpatient, Hospital


Sign in / Sign up

Export Citation Format

Share Document