Photoreduction and Thermal Properties of Graphene-Based Flexible Films

Authors: Gautam Naik, Sridhar Krishnaswamy

ABSTRACT
In the present study, we report on an efficient method for large-area photoreduction of graphene oxide flexible films. The laser-based reduction can be carried out in situ and can be tuned to attain the properties required. A systematic study has been conducted to evaluate the variation of the degree of reduction with the actual reduction temperature, which is measured using an infrared thermal camera. Local reduction temperature is varied up to 350°C, and the degree of reduction is measured using the C/O ratio. The C/O ratio is increased from 2:1 for graphene oxide to 10:1 for reduced graphene oxide. This high degree of reduction is observed at low temperatures, and also in a short period of time. Thermal conductivity properties calculated using the temperature distribution shows the in-plane thermal conductivities of graphene oxide and reduced graphene oxide are a few orders of magnitude lower than single layer graphene. This can be attributed to oxygen-defect scattering, and also due to the heat conduction through the thickness of the sample by way of contact between adjacent flakes. This photoreduction method provides a way for roll-to-roll scalable production of graphene-based flexible films.

Source:

Journal: Graphene
DOI: 10.4236/graphene.2017.62003 (PDF)
Paper Id: 75598 (metadata)

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Conjugate Gradient Method to Solve Fluid Structure Interaction Problem

Authors: Mamadou Diop, Ibrahima Mbaye

ABSTRACT
In this paper, we propose a method to solve coupled problem. Our computational method is mainly based on conjugate gradient algorithm. We use finite difference method for the structure and finite element method for the fluid. Conjugate gradient method gives suitable numerical results according to some papers.

Source:

Journal: Applied Mathematics
DOI: 10.4236/am.2017.84036 (PDF)
Paper Id: 75584 (metadata)

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Tilapia Stock Suppression by the Great Cormorant (Phalacrocorax carbo) in Lake Kinneret, Israel

Author: Gophen Moshe

ABSTRACT
The Great Cormorant (Phalcrocorax carbo sinensis) is a well-known fish predator and migratory bird. The bird is a wintering visitor in Israel from the end of October through March. During 1950-1990, the Cormorant used to stay mostly in northern Israel, in the Hula Valley, preying on fish in Lake Kinneret as well as fishponds and adjacent reservoirs. Flocks of Cormorants were deported from northern Israel to eastern and central country regions, causing severe damage to aquaculture. A second operative deportation was carried out and the birds migrated to Lake Kinneret. A survey of their feeding habits was done by The National Nature and Parks Conservation Authority. The outcome information was compiled with international data and assembled towards a conclusive summary of potential causative damage to Lake Kinneret Fishery and Ecosystem structure. Consequences are described and recommendations made.

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Journal: Open Journal of Modern Hydrology
DOI: 10.4236/ojmh.2017.72009 (PDF)
Paper Id: 75563 (metadata)

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Impact of Accelerated Stresses on Power Transformer Insulation

Authors: Jashandeep Singh, Yog Raj Sood, Piush Verma

ABSTRACT
The paper is based on the experimental investigation of accelerated stresses on insulation of power transformer. The effects of individual thermal and electrical stresses have been graphically presented. The factors accelerated thermal aging factor (ATAF) and accelerated electrical aging factor (AEAF) have been introduced, it helps to understand the contribution of thermal and electrical stresses and degradation trends of insulating properties. The accelerated aging factors have been mathematically correlated with different properties of insulation such as moisture, breakdown voltage (BDV), tan delta and resistivity. These parameters were determined experimentally for fresh oil samples and for samples subjected to accelerated aging.

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Journal: Energy and Power Engineering
DOI: 10.4236/epe.2017.94015 (PDF)
Paper Id: 75526 (metadata)

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Post-Traumatic Spinal Meningioma: A Case Report and Review of the Literature

Author: Mahmoud M. Taha

ABSTRACT
Post-traumatic meningioma is a matter of controversy with many reported cases of cranial post-traumatic meningioma and rare cases for such pathology in human spine. The author reports a 61-year-old woman who had post-traumatic spinal meningioma at the site of old traumatic fracture for 26 year after her initial trauma. The patient treated successfully with microsurgical resection and posterior fusion with improvement of here recent weakness. The author reviews the literatures for similar cases as well as reviews the controversies regarding the development of post-traumatic meningiomas.

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Journal: Open Journal of Modern Neurosurgery
DOI: 10.4236/ojmn.2017.72004 (PDF)
Paper Id: 75478 (metadata)

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The Relationship between Metacognitive Reading Strategies Use and Reading Comprehension Achievement of EFL Learners

Authors: Mina Rastegar, Ehsan Mehrabi Kermani, Massoud Khabir

ABSTRACT
The purpose of the present study was to explore the relationship between EFL learners’ metacognitive reading strategies use and their reading comprehension achievement. To fulfill this objective, 120 Iranian EFL students studying at Shahid Bahonar University of Kerman and Valiasr University of Rafsanjan took part in this study. The participants were selected from among senior BA students majoring in English Literature and English Translation. In order to obtain the required data, two instruments were utilized: survey of reading strategies by Mokhtari and Sheorey (2002) and a TOEFL reading comprehension test chosen from the materials officially printed by Educational Testing Service (2003). After collecting the required data, the statistical procedures were done using SPSS version 18. The findings of this study revealed that there was a significant positive relationship between the use of overall metacognitive reading strategies by the participants and their reading comprehension achievement.

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Journal: Open Journal of Modern Linguistics
DOI: 10.4236/ojml.2017.72006 (PDF)
Paper Id: 75472 (metadata)

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Hydrothermally Synthesized NanobioMOFs, Evaluated by Photocatalytic Hydrogen Generation

Authors: Tabinda Sattar, Muhammad Athar

ABSTRACT
Three new materials, nanobioMOFs (cobalt argeninate, cobalt asparaginate and cobalt glutaminate) have been hydrothermally synthesized. Nano sized morphology of all these materials have been obtained by scanning electron microscopic technique. Mass spectrometric studies of all these materials have been conducted for determination of their molar masses. All these nanobioMOFs have been found to exhibit photocatalytic hydrogen generation in pure water upon irradiation at wavelengths longer than 650 nm. The amounts of quantum yield of hydrogen generation at 650 nm in water was 4.5%, 4.0% and 3.5% for cobalt argeninate, cobalt asparaginate and cobalt glutaminate respectively. The apparently higher yield of hydrogen generation from these amine functionalized nanobioMOFs can direct to the development of more nano sized functionalized MOFs for water splitting.

Source:

Journal: Modern Research in Catalysis
DOI: 10.4236/mrc.2017.62007 (PDF)
Paper Id: 75419 (metadata)

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Cost-Benefit Analysis of Computer-Aided Technology Customization Projects

Author: Samar K. Saha

ABSTRACT
This paper presents a methodology to assess the quantitative benefit of a computer-aided technology customization project in wafer foundries. As the dedicated semiconductor foundries transition to complete integrated circuit (IC) product development solution providers, offering customer-centric IC fabrication technology to fables customers has become crucial for foundry business model. In order to support customers’ niche product-line, computer-aided design (CAD) tools are used for a rapid and cost-effective customization of foundry’s core IC fabrication technology. In this paper, the efficiency and effectiveness of CAD in IC fabrication technology customization projects are evaluated by an analytical model. The data obtained by the model, clearly, shows a significant reduction in technology customization cycle time and cost by using CAD in a technology customization project compared to the conventional practice.

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Journal: Open Journal of Business and Management
DOI: 10.4236/ojbm.2017.52024 (PDF)
Paper Id: 75416 (metadata)

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Antecedents of Social Network Trust in SNS Usage: The Moderating Role of Offline Familiarity

Author: Yu Wang

ABSTRACT
With the rapid development of social networks, there is a focus on marketing strategies and business models that are based on social media. In the academic world, scholars believe that online trust is a key factor contributing to online purchasing behavior. This article explored several factors in social media trust and verified the moderating role of offline familiarity by using relevant research on online trust in conjunction with a structure equation model. The results show that independent variables such as reputation, SNS interaction, information quality, reciprocity, satisfaction and shared values have a positive influence on trust, whereas perceived similarity does not, and information quality is the most important factor. In addition, offline familiarity significantly moderates the relations between information quality, reciprocity, reputation, shared values and social media trust. This information is important to assist companies in developing an effective social network marketing strategy.

Source:

Journal: Social Networking
DOI: 10.4236/sn.2017.62007 (PDF)
Paper Id: 75391 (metadata)

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Linear Prolate Functions for Signal Extrapolation with Time Shift

Authors: Daniela Valente, Michael Cada, Jacek Ilow

ABSTRACT
We propose a low complexity iterative algorithm for band limited signal extrapolation. The extrapolation method is based on the decomposition of finite segments of the signal via truncated series of real-valued linear prolate functions. Our theoretical derivation shows that given a truncated series (up to a selectable value) of prolate functions, it is possible to extrapolate the band limited function elsewhere if each extrapolated portion of the function is subject only to moderate truncation errors that we quantify in this paper. The effects of different sources of errors have been analyzed via extensive simulations. We have investigated a property of the signal decomposition formula based on linear prolate functions whereby the integration interval does not need to be symmetric with respect to the origin while time-shifted prolate functions are used in the series.

Source:

Journal: Applied Mathematics
DOI: 10.4236/am.2017.84034 (PDF)
Paper Id: 75374 (metadata)

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