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Dec 11, 2018Open    AccessArticle

Oil Film and Pressure Characteristics of the Friction Pair

Shan Hu
In order to improve the friction performance of the valve plate and improve the oil film bearing capacity of the valve plate, the influence of the fluid-solid coupling on the performance of the oil film of the valve plate was studied. The lubrication characteristics of the surface texture of the valve plate was studied systematically based on the theory, simulation and coupling effects. In this paper, the geometrical model of hydr
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Dec 11, 2018Open    AccessArticle

Assessment Practices of Teachers in Selected Primary and Secondary Schools in Jamaica

Cynthia Onyefulu
The purpose of the study was to determine if there were differences in the perceptions of primary and secondary school teachers’ classroom assess-ment practices in region one in Jamaica. Seven research questions guided the study. An analytic survey research design was used to answer the research questions. A stratified random sampling method was used to select 225 teachers. However, a total of 157 (64 primary & 93 secondary) s
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Dec 11, 2018Open    AccessArticle

Exploring Hotel Management Innovation

Chieh-Heng Ko
The study of management innovation has gained relevance in recent years, but there is a lack of empirical research analyzing the factors that favor it. This article contemplates two types of antecedents of management innovation in the hospitality industry. In the internal context of the company, the influence of the employees’ knowledge and skills is analyzed, as well as the company’s capacity to integrate this knowledg
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Dec 05, 2018Open    AccessArticle

Research on Artificial Intelligence Frontier Recognition Based on LDA

Ting Xie, Ping Qin, Juehu Yan
Research frontier is the focus of scientific frontier and guides the direction of scientific development. It is of great significance for the state, institutions and researchers to grasp the research frontier in a timely and accurate manner. Based on LDA model, this paper uses Python language to carry out standardized processing, stop words removal, stem extraction and word shape restoration on foreign artificial intelligence data
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Dec 04, 2018Open    AccessArticle

Serum Neopterin as a Novel Marker for Carotid Artery Stenosis in Community Subjects

Huanquan Liao, Zhichao Yan, Hongxuan Wang, Hua Hong
Background: Carotid artery stenosis (CAS) is one of the major high-risk mechanisms of stroke. Neopterin, an immune modulator secreted by macro-phages, has been reported to be elevated in patients with cerebrovascular dis-ease. However, an association between serum neopterin level and CAS has not been firmly established. Objective: To investigate the cross-sectional relation-ship between serum neopterin levels and CAS assessed by u
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Nov 30, 2018Open    AccessArticle

The Effect of Board of Directors Characteristics on Firm’s Financial Performance: An Empirical Study on the Most Active Firms in the Egyptian Stock Exchange

Ashraf Mohamed Abdel Atty, Mohamed Moustafasoliman, Amr E. Youssef
This paper seeks examining the effect of Board of Directors Characteristics on firm’s financial performance in Egypt, using a sample of 50 more active Egyp-tian companies listed on the Egyptian Stock Exchange of the non-financial sector covering the period of three financial years from 2012 to 2017. Board of Directors Structure is represented by CEO Duality, Board Size, Board Meet-ings, Independence board members and Gender Divers
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Nov 30, 2018Open    AccessArticle

Modeling Wind Energy Using Copula

Zuhair Bahraoui, Fatima Bahraoui, M. Amin Bahraoui
In most studies related to wind energy, the quantity of the air density is consid-ered constant, but actually, we know that it is variable and depending on others natural factors. We present a new procedure to estimate the wind density power energy by simulating the components of the air density. The procedure uses the copula theory and demonstrates that the estimated power energy is higher if
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Nov 30, 2018Open    AccessArticle

Cointegration Based Regression to Analyse Linkage between Share Price Index and Macroeconomic Variables: Evidence from Colombo Stock Exchange

Gayani Thalagoda, Kusal Rathnayake, Sachith Abeysundara
The main objective of the study is to investigate the long run performance of the All Share Price Index (ASPI) of the Colombo Stock Exchange, based on the economic activities of Sri Lanka using cointegration and auto regressive time series. The cointegration test illustrates that share price index is cointegrated with a specific set of macroeconomic variables, i.e. exchange rate (USD/LKR), money supply, wage rates, wet foreign ass
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Nov 30, 2018Open    AccessArticle

Happiness and Optimism Interventions at Work: Gender Differences

Alejandro Sanín-Posada, Marisa Salanova Soria, Pablo Vera-Villaroel
The aim of this quasi-experimental study was to analyze the changes derived from happiness and optimism interventions in 12 groups of employees chosen at random in two Colombian companies. For the happiness intervention, three conditions were applied: Expressing Gratitude, Acts of Kindness and Pencil in the Mouth. In the case of optimism, three other conditions were used: Breaking the Routine, Reformulating Goals and Resignifying Failure. In addition, an-swers from a control group, a placebo gro...


Nov 29, 2018Open    AccessArticle

Dark Matter: SO-2’s Gravitational Redshift Could Give an Important Clue to Solve the Dark Matter Mystery

Stéphane Le Corre
The star SO-2 at the galactic center was recently at its closest distance to the supermassive black hole (SMBH). It allowed measuring relativistic effects. The observations confirm that the general relativity is the best gravitational theory compared to other alternative theories [1]. But although an excellent agreement with the observations is obtained all along the orbit, a discrepancy in the redshift of SO-2 is measured at its
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