Energy and Time Efficient Microwave Curing for CFRP Parts Manufactured by Filament Winding

Process time reduction and energy/cost savings are usually in the focus of production process improvements. New technologies provide possibilities to achieve significant enhancements for relevant operation figures.Curing cycle times for CFRP manufacturing depend on several requirements: Type of resin, requested glass transition temperature, used equipment and energy source as well as sample size, weight, fibre volume ratio, fibre orientation etc. Conventional methods are mostly based on heat conduction while microwaves offer a selective and volumetric heating of the samples. Process time reduction and energy saving are the positive effects of the microwave curing technology.This paper will give an overview of the current status of this process technology not only focussing on technical aspects but also covering the process and economic effects.This work has been performed under the German BMBF project 02PJ2131, FLAME under the program Energy Efficient Light Weight Construction.

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EFFECT OF FIBRE TREATMENT ON LONGITUDINAL AND TRANSVERSE TENSILE PROPERTIES OF UNIDIRECTIONAL KENAF COMPOSITE

Jurnal Teknologi ◽

10.11113/jt.v76.5918 ◽

2015 ◽

Vol 76 (11) ◽

Author(s):

Norhashidah Manap ◽

Aidah Jumahat ◽

Napisah Sapiai

Keyword(s):

Tensile Properties ◽

Strain Curve ◽

Natural Fibre ◽

Filament Winding ◽

Fracture Mechanisms ◽

Positive Effects ◽

Transverse Tensile ◽

Kenaf Fibre ◽

Naoh Treatment ◽

Kenaf Composites

Kenaf fibre has become one of the best candidates to be used as reinforcement material in polymer composite. However, the adhesion between natural fibre and polymer is weak due to different polarity of natural fibre and hydrophobic polymer. This affects the properties of the composite. One of the method to overcome this compatibility issue is by treating the fibre using sodium hydroxide (NaOH). This study is aimed to evaluate the effect of NaOH treatment on longitudinal and transverse tensile properties of kenaf composites using three different concentration (3, 5, and 7 wt. % NaOH). The kenaf composite test specimens were prepared using filament winding and vacuum bagging techniques. The 0o and 90o tensile tests were conducted in accordance to ASTM standard D3039 in order to obtain longitudinal and transverse tensile properties of treated and untreated kenaf composites. The fracture surfaces of the specimens were observed using scanning electron microscope in order to identify fracture mechanisms involved during tension. NaOH treatment on kenaf fibre resulted in a significant improvement in longitudinal tensile modulus, strength and failure strain. This also indicates an improvement in toughness property as this can be observed through a larger area under graph of tensile stress-strain curve. The SEM micrographs showed that the interfacial adhesion between kenaf fibre and epoxy matrix was improved when the kenaf fibre was treated using NaOH. Therefore, NaOH treatment give positive effects on longitudinal and transverse tensile properties of kenaf composites. Kenaf composite treated with 7wt% NaOH showed the highest tensile strength for both longitudinal and transverse fibre directions.

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Molecular Diagnostics in Melanoma: Current Status and Perspectives

Archives of Pathology & Laboratory Medicine ◽

10.5858/2009-0623-rar1.1 ◽

2011 ◽

Vol 135 (7) ◽

pp. 860-869 ◽

Cited By ~ 3

Author(s):

Soheil S. Dadras

Keyword(s):

Molecular Diagnostics ◽

Ribonucleic Acid ◽

New Technologies ◽

Mutational Analysis ◽

Transcriptional Profiling ◽

Clinical Information ◽

Current Status ◽

Comparative Genomic ◽

Molecular Approaches ◽

Fresh Frozen

Abstract Context.—In the current “molecular” era, the advent of technology, such as array-based platforms, systems biology, and genome-wide approaches, has made it possible to examine human cancers, including melanoma, for genetic mutations, deletions, amplification, differentially regulated genes, and epigenetic changes. Advancement in current technologies is such that one can now examine ribonucleic acid (RNA), deoxyribonucleic acid (DNA), and protein directly from the patient's own tumor. Objective.—To apply these new technologies in advancing molecular diagnostics in melanoma has historically suffered from a major obstacle, namely, the scarcity of fresh frozen, morphologically defined tumor banks, annotated with clinical information. Recently, some of the new platforms have advanced to permit utilization of formalin-fixed, paraffin-embedded (FFPE) tumor specimens as starting material. Data Sources.—This article reviews the latest technologies applied to FFPE melanoma sections, narrowing its focus on the utility of transcriptional profiling, especially for melastatin; comparative genomic hybridization; BRAF and NRAS mutational analysis; and micro ribonucleic acid profiling. Conclusion.—New molecular approaches are emerging and are likely to improve the classification of melanocytic neoplasms.

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Influential Factors for Older Users’ Acceptance of eHealth Services: an Integrated Acceptance Framework (IAF) (Preprint)

10.2196/preprints.31920 ◽

2021 ◽

Author(s):

Jiyeon Yu ◽

Angelica de Antonio ◽

Elena Villalba-Mora

Keyword(s):

Systematic Review ◽

Older Adults ◽

New Technologies ◽

Meta Analysis ◽

Health Condition ◽

Influential Factors ◽

Current Status ◽

Five Dimensions ◽

The Impact ◽

Acceptance Factors

BACKGROUND eHealth and Telehealth play a crucial role in assisting older adults who visit hospitals frequently or who live in nursing homes and can benefit from staying at home while being cared for. Adapting to new technologies can be difficult for older people. Thus, to better apply these technologies to older adults’ lives, many studies have analyzed acceptance factors for this particular population. However, there is not yet a consensual framework to be used in further development and the search for solutions. OBJECTIVE This paper presents an Integrated Acceptance Framework (IAF) for the older user’s acceptance of eHealth, based on 43 studies selected through a systematic review. METHODS We conducted a four-step study. First, through a systematic review from 2010 to 2020 in the field of eHealth, the acceptance factors and basic data for analysis were extracted. Second, we carried out a thematic analysis to group the factors into themes to propose and integrated framework for acceptance. Third, we defined a metric to evaluate the impact of the factors addressed in the studies. Last, the differences amongst the important IAF factors were analyzed, according to the participants’ health conditions, verification time, and year. RESULTS Through the systematic review, 731 studies were founded in 5 major databases, resulting in 43 selected studies using the PRISMA methodology. First, the research methods and the acceptance factors for eHealth were compared and analyzed, extracting a total of 105 acceptance factors, which were grouped later, resulting in the Integrated Acceptance Framework. Five dimensions (i.e., personal, user-technology relational, technological, service-related, environmental) emerged with a total of 23 factors. Also, we assessed the quality of the evidence. And then, we conducted a stratification analysis to reveal the more appropriate factors depending on the health condition and the assessment time. Finally, we assess which are the factors and dimensions that are recently becoming more important. CONCLUSIONS The result of this investigation is a framework for conducting research on eHealth acceptance. To elaborately analyze the impact of the factors of the proposed framework, the criteria for evaluating the evidence from the studies that have extracted factors are presented. Through this process, the impact of each factor in the IAF has been presented, in addition to the framework proposal. Moreover, a meta-analysis of the current status of research is presented, highlighting the areas where specific measures are needed to facilitate e-Health acceptance.

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Modern Educational Technologies and National Interests

Turkish Journal of Computer and Mathematics Education (TURCOMAT) ◽

10.17762/turcomat.v12i6.2475 ◽

2021 ◽

Vol 12 (6) ◽

pp. 1348-1355

Author(s):

Emin Garibli, Aysel Garibli

Keyword(s):

Lifelong Learning ◽

New Technologies ◽

Mother Tongue ◽

Educational Technologies ◽

Negative Effects ◽

National Interests ◽

Positive Effects ◽

Remote Training ◽

The Right ◽

Effective Use

As we know, one of the lifelong learning forms, which is the correspondence education, has received a wide circulation in our country. However, we have recently mentioned that the type of education should be adapted to modern conditions. As a way out from this situation, the article analyzed the specifics of the distance and supplementary education in the world and the stages of development. Mechanisms of application of existing educational technologies in Azerbaijan were studied. In order to achieve the goals mentioned in the article, the relevant legislation of Azerbaijan has been prepared and recommendations for institutional reforms have been prepared. In the context of globalization, the development of new technologies has negative effects, though there are positive effects. The strengthening of globalization leads to the inequality of development among countries, the sharp differences in the living standards of the population, the escalation of language, religion, traditions and, ultimately, the weakening of national state institutions. In this case, the protection and development of the state language is of great importance and special attention should be paid to this problem. At the end of the article, we came to the problem from another aspect, and we believe that if we use the right technologies properly and precisely, it can be achieved through the promotion of mother tongue. Our compatriots living abroad will be able to acquire new knowledge and will not forget and develop their mother tongue with effective use of remote training technologies. Millions of our compatriots living abroad will be able to benefit from these advantages. In order to achieve this, it is important to use the modern IT technologies' innovations as well as the effective use of language teaching methods for language development carried out by linguists. We believe that there is a relationship between these two factors, and when analyzing lifelong learning issues, there is a need for two aspects. At the end, it should be noted that we have to analyze the problem from different perspectives and make suggestions.

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Application of Artificial Intelligence in Early Gastric Cancer Diagnosis

Digestion ◽

10.1159/000519601 ◽

2021 ◽

pp. 1-7

Author(s):

Zili Xiao ◽

Danian Ji ◽

Feng Li ◽

Zhengliang Li ◽

Zhijun Bao

Keyword(s):

Artificial Intelligence ◽

Gastric Cancer ◽

New Technologies ◽

Narrow Band Imaging ◽

Daily Practice ◽

Colorectal Polyps ◽

Current Status ◽

Randomized Controlled ◽

Depth Prediction ◽

Substantial Effort

Background: With the development of new technologies such as magnifying endoscopy with narrow band imaging, endoscopists achieved better accuracy for diagnosis of gastric cancer (GC) in various aspects. However, to master such skill takes substantial effort and could be difficult for inexperienced doctors. Therefore, a novel diagnostic method based on artificial intelligence (AI) was developed and its effectiveness was confirmed in many studies. AI system using convolutional neural network has showed marvelous results in the ongoing trials of computer-aided detection of colorectal polyps. Summary: With AI’s efficient computational power and learning capacities, endoscopists could improve their diagnostic accuracy and avoid the overlooking or over-diagnosis of gastric neoplasm. Several systems have been reported to achieved decent accuracy. Thus, AI-assisted endoscopy showed great potential on more accurate and sensitive ways for early detection, differentiation, and invasion depth prediction of gastric lesions. However, the feasibility, effectiveness, and safety in daily practice remain to be tested. Key messages: This review summarizes the current status of different AI applications in early GC diagnosis. More randomized controlled trails will be needed before AI could be widely put into clinical practice.

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Review of existing energy management standards and possibilities for its introduction in Serbia

Thermal Science ◽

10.2298/tsci091106003j ◽

2010 ◽

Vol 14 (3) ◽

pp. 613-623 ◽

Cited By ~ 8

Author(s):

Dubravka Jelic ◽

Dusan Gordic ◽

Milun Babic ◽

Davor Koncalovic ◽

Vanja Sustersic

Keyword(s):

Best Practices ◽

Energy Management ◽

Energy Efficient ◽

Management Practices ◽

Energy Savings ◽

Management Strategies ◽

Current Status ◽

Positive Effects ◽

Management Standards ◽

Current State

Until recent times, energy management practices primarily consisted in replacing inefficient equipment and then using any number of methods to estimate obtained savings. Experience shows that positive effects of energy efficient improvements were decreased over time. There have been significant efforts over the last decade to define appropriate standards and best practices and implement the consistent energy management system to increase and maintain the energy savings. The knowledge gained from thousands of energy efficient projects is driving a transition from traditional tactical practice (one-time "build and forget" projects) to energy management strategies proposed and endorsed by a number of international organizations. The current status of internationally developed energy management standards, including an analysis of their shared features and differences is presented in this paper. The purpose of the analysis is to describe the current state of ?best practices? for this emerging area of energy efficiency policymaking in order to study the possibility of implementation of energy management standards in Serbia and to estimate the effects and the potential for energy saving that would be made by its implementation.

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Tuning, Impedance Matching, and Temperature Regulation during High-Temperature Microwave Sintering of Ceramics

Advances in Materials Science and Engineering ◽

10.1155/2018/4158969 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Sylvain Marinel ◽

Nicolas Renaut ◽

Etienne Savary ◽

Rodolphe Macaigne ◽

Guillaume Riquet ◽

...

Keyword(s):

Material Processing ◽

High Temperature ◽

Microwave Sintering ◽

Impedance Matching ◽

Single Mode ◽

Electrical Circuit ◽

Ease Of Use ◽

Heating Process ◽

Process Technology ◽

Volumetric Heating

Over the years, microwave radiation has emerged as an efficient source of energy for material processing. This technology provides a rapid and a volumetric heating of material. However, the main issues that prevent microwave technology from being widespread in material processing are temperature control regulation and heating distribution within the sample. Most of the experimental works are usually manually monitored, and their reproducibility is rarely evaluated and discussed. In this work, an originally designed 915 MHz microwave single-mode applicator for high-temperature processing is presented. The overall microwave system is described in terms of an equivalent electrical circuit. This circuit has allowed to point out the different parameters which need to be adjusted to get a fully controlled heating process. The basic principle of regulation is then depicted in terms of a block function diagram. From it, the process has been developed and tested to sinter zirconia- and spinel-based ceramics. It is clearly shown that the process can be successfully used to program multistep temperature cycles up to ∼1550°C, improving significantly the reproducibility and the ease of use of this emerging high-temperature process technology.

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Application of Genomic Big Data in Plant Breeding: Past, Present, and Future

Plants ◽

10.3390/plants9111454 ◽

2020 ◽

Vol 9 (11) ◽

pp. 1454

Author(s):

Kyung Do Kim ◽

Yuna Kang ◽

Changsoo Kim

Keyword(s):

Plant Breeding ◽

Crop Production ◽

New Technologies ◽

Biological Data ◽

Genomic Research ◽

Current Status ◽

Plant Genomics ◽

New Paradigm ◽

The Past ◽

Interdisciplinary Approaches

Plant breeding has a long history of developing new varieties that have ensured the food security of the human population. During this long journey together with humanity, plant breeders have successfully integrated the latest innovations in science and technologies to accelerate the increase in crop production and quality. For the past two decades, since the completion of human genome sequencing, genomic tools and sequencing technologies have advanced remarkably, and adopting these innovations has enabled us to cost down and/or speed up the plant breeding process. Currently, with the growing mass of genomic data and digitalized biological data, interdisciplinary approaches using new technologies could lead to a new paradigm of plant breeding. In this review, we summarize the overall history and advances of plant breeding, which have been aided by plant genomic research. We highlight the key advances in the field of plant genomics that have impacted plant breeding over the past decades and introduce the current status of innovative approaches such as genomic selection, which could overcome limitations of conventional breeding and enhance the rate of genetic gain.

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