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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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Nov 28, 2018Open    AccessArticle

On Almost Pretopological Vector Spaces

Shallu Sharma, Madhu Ram, Sahil Billawria
In this paper, we introduce the notion of almost pretopological vector spaces and present some examples of almost pretopological vector spaces. Almost pretopological vector spaces are defined by using regular open sets and pre-open sets. The relationships of almost pretopological vector spaces with certain other types of spaces are provided. Along with some useful results, it is proved that in
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Nov 27, 2018Open    AccessArticle

Noise Simulation Analysis of a Variable Displacement External Gear Pump and Unloading Groove Optimization

Yongkang Zhou, Wenwu Li, Dongpo Yang
The oil pump is an important part of vehicle engine, whose noise and vibration characteristics affect the engine performance significantly. The noises generat-ed by both the pressure and flow fluctuations are the main contributors to the oil pump noise. In this paper, noise analysis of an external gear pump is carried out by using the computational fluid dynamics (CFD) method and The Lighthill
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Nov 27, 2018Open    AccessArticle

Reference Values for Umbilical Cord Blood Gases of Newborns Delivered in Enshi Tujia and Miao Autonomous Prefecture

Huijie Wu, Qian Yu, Wen Wang, Li Li
Objective: To define the normal ranges of umbilical cord blood values in Enshi Tujia and Miao Autonomous Prefecture. Methods: 1266 normal newborns were screened as umbilical cord blood gas samples. Normal neonates are full-term live pregnancies, single births, weight suitable for gestational age and heavier than the gestational age of the newborn without complications. Re-sults: The umbilical
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