scholarly journals Contributions of polyelectrolyte complexes and ionic bonding to performance of barrier films for packaging: A review

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4544-4605
Author(s):  
Martin A. Hubbe
Keyword(s):  
Research Progress ◽  
Ionic Bond ◽  
Polyelectrolyte Complexes ◽  
Factors Affecting ◽  
Plastic Films ◽  
Barrier Films ◽  
Mineral Particles ◽  
Other Substances ◽  
Ionic Bonds ◽  
Research Findings

Barrier films that are used on packages play an important role, especially in the protection of food products. Research is being carried out at an accelerating pace to replace petroleum-based plastic films, which do not biodegrade and are difficult to recycle. This review article considers publications related to the use of polyelectrolyte complexes (PECs) in barrier films as a strategy to decrease the permeation of oxygen and other substances into and out from packages. Research progress has been achieved in using combinations of positively and negatively charged polymers, sometimes together with platy mineral particles, as a way to restrict diffusion through packaging materials. In principle, the ionic bonds within PECs contribute to a relatively high cohesive energy density within such a barrier film, which can resist diffusion of various gases and greasy substances. Resistance to water vapor, as well as aqueous substances, represent important challenges for barrier concepts that depend on ionic bond contributions. Factors affecting barrier performance of PEC-based films are discussed in light of research findings.

Implementasi Manajemen Pengetahuan pada Perguruan Tinggi Swasta di Kabupaten Garut

2019 ◽  
Vol 22 (2) ◽  
Author(s):  
Hendarsita Amartiwi
Keyword(s):  
Knowledge Management ◽  
Private Higher Education ◽  
Survey Method ◽  
Unit Of Analysis ◽  
Factors Affecting ◽  
Confirmatory Factor ◽  
Research Findings ◽  
Survey Results ◽  
Use Of Knowledge ◽  
Descriptive Statistical Analysis

This study scrutinize the factors affecting knowledge management, consisting of acquisition of knowledge, storage of knowledge, distribution of knowledge and use of knowledge, at Private Higher Education Institutions in Garut Regency.  The purpose of this study is to analyze the factors shaping the knowledge management.  By using a survey method with a quantitative approach, the unit of analysis of this study is lecturer at 14 Private Universities in Garut Regency, with 229 lecturers as respondents. Data is obtained from survey results through questionnaires distributed directly to lecturers. Data is processed using descriptive statistical analysis and Confirmatory Factor Analysis (CFA). The research findings showed that the use of knowledge and the storage of knowledge are the most powerful factors in knowledge management, followed by the acquisition of knowledge, and distribution of knowledge.

scholarly journals A Review of Factors Affecting the Mechanical Properties of Maraging Steel 300 Fabricated via Laser Powder Bed Fusion

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1273 ◽  
Author(s):  
Barry Mooney ◽  
Kyriakos Kourousis
Keyword(s):  
Mechanical Properties ◽  
Maraging Steel ◽  
Processing Parameters ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Factors Affecting ◽  
Powder Bed ◽  
Porosity Defects ◽  
Research Findings ◽  
Microstructure Density

Maraging steel is an engineering alloy which has been widely employed in metal additive manufacturing. This paper examines manufacturing and post-processing factors affecting the properties of maraging steel fabricated via laser powder bed fusion (L-PBF). It covers the review of published research findings on how powder quality feedstock, processing parameters, laser scan strategy, build orientation and heat treatment can influence the microstructure, density and porosity, defects and residual stresses developed on L-PBF maraging steel, with a focus on the maraging steel 300 alloy. This review offers an evaluation of the resulting mechanical properties of the as-built and heat-treated maraging steel 300, with a focus on anisotropic characteristics. Possible directions for further research are also identified.

A Qualitative Analysis of Factors Affecting the Successful Completion of Postgraduate Studies

2021 ◽  
Vol 12 (3) ◽  
pp. 152-161
Author(s):  
Abdul Munir Ismail Et.al
Keyword(s):  
Interpersonal Relationships ◽  
Relevant Information ◽  
Learning Approaches ◽  
Successful Completion ◽  
Structured Interviews ◽  
Postgraduate Students ◽  
Factors Affecting ◽  
Face To Face ◽  
Postgraduate Studies ◽  
Research Findings

The study aims to highlight the current learning approaches used by postgraduate students to complete their postgraduate studies on time, as studies have shown many students have failed to finish their studies as planned. In particular, this study focuses on factors and methods that are perceived to be most effective by students to help them complete their studies on time.  Methodology: Thisstudy was based on a qualitative approach involving semi-structured interviews. The study sample consisted of 14 postgraduate students and one lecturers as respondents. The research instrument was based on interview questions to elicit relevant information on their demography and learning practices. Data were collected and organized into four themes and were subsequently analyzed descriptively.     Findings: The findings showed that face-to-face discussions were the most popular practice adopted by the respondents. The findings also showed several factors had significant impacts on student learning, such as interpersonal relationships between students and supervisors, commitment, financial commitment, and moral support, which needs to be taken into account in helping students to complete on time.     Significance: The research findings can inform all the stakeholders, notably students, supervisors, and administrative officers, factors that have profound impacts on postgraduate students’ efforts to graduate on time.

scholarly journals The Contributions of Reading Strategies and Reading Frequencies toward Students’ Reading Comprehension Skill in Higher Education

2019 ◽  
Vol 8 (6S3) ◽  
pp. 593-597
Keyword(s):  
Reading Comprehension ◽  
Reading Strategies ◽  
Reading Skill ◽  
Scale Reading ◽  
Factors Affecting ◽  
Comprehension Skill ◽  
Correlational Design ◽  
Comprehension Skills ◽  
Research Findings ◽  
Reading Comprehension Skills

This study was conducted because of the low level of students’ reading skill. The reading strategies and the reading frequencies were assumed as the factors affecting students’ reading skill. The aim of this study was to describe and to analyze the contribution of reading strategies and reading frequencies toward students’ reading comprehension skill. This study used the quantitative method with the descriptive correlational design. The population was 3000 students who attended Bahasa Indonesia subject in Universitas Negeri Padang, and 353 students were taken as samples by using proportional stratified random sampling. The instruments of this study were reading strategies scale, reading frequencies scale and a reading comprehension test which has been valid and reliable. Based on research findings and discussion, the following can be concluded: (1) reading strategies contributed significance and positively to the students' comprehension reading skill which is 19.6% (R = 0.443 R2 = 0.196 and p = 0.000), i.e. reading strategies contributed directly toward the skills of reading comprehension. Therefore, the higher the reading strategies, the better the reading comprehension skills of the students; (2) reading strategies contributed significance toward the students' reading comprehension skills of 33.1% (R = 0.575 R2 = 0.331 and p = 0.000), i.e. reading frequencies contributed directly to reading comprehension skills. Therefore, the better the reading frequencies, the better the reading comprehension skills of the students; (3) reading strategies and the reading frequencies together contributed significance toward the students' reading comprehension skills of 33.2% (R = 0.575, R2 = 0.332 and p = 0.000), i.e. reading strategies and reading frequencies together contributed directly to the comprehension reading skill. Therefore, the higher the reading strategies and reading frequencies will be the better the reading comprehension skill of the students.

Research Progress in the Preparation of Flexible Substrate Barrier Films

2021 ◽  
Vol 1027 ◽  
pp. 91-98
Author(s):  
Li Xia Guan ◽  
Zhao Yi Zhou ◽  
Yi Jing Huang
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Flexible Electronics ◽  
Flexible Substrate ◽  
Research Progress ◽  
Barrier Films ◽  
Main Challenge ◽  
Long Life

The development of flexible electronics towards for the direction of bend ability, lightweight, portability, long life against falling. The performance of the substrate in the flexible electronics plays a very important role in the development of electronics. In this article, three preparation technologies of thin films are introduced, including CVD, PVD and ALD. The paper also introduces the research progress on the preparation of substrate barrier films, and one main challenge that may face by the preparation of thin film materials. In order to satisfy the development of flexible electronics, improving the substrate’s performance constantly is needed. Finally, the development of preparing barrier films is prospected.

Conventional and Deep-Water Shipping Passages Along the Northern Sea Route

2019 ◽  
pp. 314-337
Author(s):  
Andrey Afonin ◽  
Evgeniy Olkhovik ◽  
Alexander Tezikov
Keyword(s):  
Deep Water ◽  
The Arctic ◽  
Intensity Increase ◽  
State University ◽  
Factors Affecting ◽  
Northern Sea Route ◽  
Major Development ◽  
Previous Decade ◽  
Principal Factors ◽  
Research Findings

The chapter presents a description of conventional and deep-water shipping routes within the water areas of the Northern Sea Route (NSR). There are provided the evaluation of the hydrographical survey of the Arctic Ocean seabed with respect to navigational safety along with the summary of the principal factors affecting the efficiency and safety of shipping in the polar water. The chapter discusses the current situation and major development tendencies of the NSR, in particular the forecasted growth of navigation intensity, increase of the shares of high ice-strengthened heavy-tonnage vessels and hazardous cargoes in transportation, and spread of the year-round navigation zone to the East. Some of the research findings obtained during the previous decade at the Arctic Faculty of Admiral Makarov State University of Maritime and Inland Shipping are provided. The assessment of the effects of shallows and ice on the working capacity of the NSR for deep-draft vessels is provided.

Investment apportionments among participants of PPP rental retirement villages

2019 ◽  
Vol 10 (1) ◽  
pp. 64-77
Author(s):  
Shijing Liu ◽  
Hongyu Jin ◽  
Chunlu Liu ◽  
Benzheng Xie ◽  
Anthony Mills
Keyword(s):  
Pension Funds ◽  
Return Rate ◽  
Key Factors ◽  
Content Type ◽  
Factors Affecting ◽  
Investment Allocation ◽  
Research Findings ◽  
The Government ◽  
Mean Variance

Purpose The purpose of this paper is to examine public–private partnership (PPP) approaches for the construction of rental retirement villages in Australia and to allocate the investment proportions under a certain project return rate among three investors which are the government, private sectors and pension funds. The apportionment will achieve a minimum overall investment risk for the project. Design/methodology/approach Capital structure, particularly determination of investment apportionment proportions, is one of the key factors affecting the success of PPP rental retirement villages. Markowitz mean-variance model was applied to examine the investment allocations with minimum project investment risks under a certain projected return rate among the PPP partners for the construction of rental retirement villages. Findings The research findings validate the feasibility of the inclusion of pension funds in the construction of PPP rental retirement villages and demonstrate the existence of relationships between the project return rate and the investment allocation proportions. Originality/value This paper provides a quantitative approach for determination of the investment proportions among PPP partners to enrich the theory of PPP in relation to the construction of rental retirement villages. This has implications for PPP partners and can help these stakeholders make vital contributions in developing intellectual wealth in the PPP investment area while providing them with a detailed guide to decision making and negotiation in relation to investment in PPP rental retirement villages.

scholarly journals Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 444 ◽  
Author(s):  
Yunqing Gu ◽  
Songwei Yu ◽  
Jiegang Mou ◽  
Denghao Wu ◽  
Shuihua Zheng
Keyword(s):  
Drag Reduction ◽  
Reynolds Numbers ◽  
Research Progress ◽  
Polymer Additives ◽  
Factors Affecting ◽  
Mechanism Model ◽  
Reduction Effect ◽  
Reduction Characteristics ◽  
Degradation Properties ◽  
Degradation Ability

Polymer additives and surfactants as drag reduction agents have been widely used in the field of fluid drag reduction. Polymer additives can reduce drag effectively with only a small amount, but they degrade easily. Surfactants have an anti-degradation ability. This paper categorizes the mechanism of drag reducing agents and the influencing factors of drag reduction characteristics. The factors affecting the degradation of polymer additives and the anti-degradation properties of surfactants are discussed. A mixture of polymer additive and surfactant has the characteristics of high shear resistance, a lower critical micelle concentration (CMC), and a good drag reduction effect at higher Reynolds numbers. Therefore, this paper focuses more on a drag reducing agent mixed with a polymer and a surfactant, including the mechanism model, drag reduction characteristics, and anti-degradation ability.

THE PRODUCTION OF IMMUNO-CONGLUTININ: III. FACTORS AFFECTING THE RESPONSE TO AUTOSTIMULATION IN MICE

1962 ◽  
Vol 8 (3) ◽  
pp. 335-344 ◽  
Author(s):  
D. G. Ingram
Keyword(s):  
Factors Affecting ◽  
Active Surfaces ◽  
Antigenic Properties ◽  
Other Substances

A number of carbohydrates, proteins, bacteria, and other substances with biophysically active surfaces were injected into mice to find which type of substances or surfaces stimulated the production of immuno-conglutinin by auto-stimulation. Mice injected with a variety of compounds which have different antigenic properties, as well as certain substances with absorptive surfaces, produced immuno-conglutinin. The data reported are in agreement with the hypothesis that immuno-conglutinin (autostimulation) is an autoantibody and that adsorbed complement is its specific-stimulating antigen.

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