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Smart model for accurate estimation of solar radiation

Lazhar ACHOUR, Malek BOUHARKAT, Ouarda ASSAS, Omar BEHAR

Frontiers in Energy 2020, Volume 14, Issue 2,   Pages 383-399 doi: 10.1007/s11708-017-0505-3

Abstract: Prediction of solar radiation has drawn increasing attention in the recent years. This is because of the lack of solar radiation measurement stations. In the present work, 14 solar radiation models have been used to assess monthly global solar radiation on a horizontal surface as function of three parameters: extraterrestrial solar irradiance ( ), duration sunshine ( ) and daylight hours ( ). Since it has been observed that each model is adequate for some months of the year, one model cannot be used for the prediction of the whole year. Therefore, a smart hybrid system is proposed which selects, based on the intelligent rules, the most suitable prediction model of the 14 models listed in this study. For the test and evaluation of the proposed models, Tamanrasset city, which is located in the south of Algeria, is selected for this study. The meteorological data sets of five years (2000–2004) have been collected from the Algerian National Office of Meteorology (NOM), and two spatial databases. The results indicate that the new hybrid model is capable of predicting the monthly global solar radiation, which offers an excellent measuring accuracy of values ranging from 93% to 97% in this location.

Keywords： global solar radiation     statistical indicator     hybrid model     spatial database     correlation coefficients    

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Experimental study of aerodynamic interference effects on aerostatic coefficients of twin deck bridges

Zhiwen LIU , Zhengqing CHEN , Gao LIU , Xinpeng SHAO ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 292-298 doi: 10.1007/s11709-009-0048-8

Abstract: The aerodynamic interference effects on aerostatic coefficients of twin deck bridges with large spanchanged during the wind tunnel test to study the effects on aerodynamic interferences of aerostatic coefficientsThe research results have shown that the drag coefficients of the leeward deck are much smaller thanThe drag coefficients of a windward deck decrease slightly compared with that of a single deck.And the aerodynamic interference effects on lift and torque coefficients of twin decks can be neglected

Keywords： twin decks     aerodynamic interference effects     aerostatic coefficients     wind tunnel test    

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Calculations of narrow-band transimissities and the Planck mean absorption coefficients of real gases

Huaqiang CHU, Mingyan GU, Huaichun ZHOU, Fengshan LIU

Frontiers in Energy 2014, Volume 8, Issue 1,   Pages 41-48 doi: 10.1007/s11708-013-0292-4

Abstract: The Planck mean absorption coefficients of CO , H O, CO, and CH in the temperature range of 300 to 2500The SNB model was also used to calculate the Planck mean absorption coefficients of these four radiating

Keywords： transimissity     HITEMP     HITRAN     Planck mean absorption coefficients    

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Expressions for Differential and Apparent Coefficients of Static Friction

Wang Weiyuan

Strategic Study of CAE 2001, Volume 3, Issue 8,   Pages 29-32

Abstract:

Recently, scientists and engineers are interested in coefficients of static friction on micro andOn macro scale, the friction force is proportional to load, the apparent coefficients of static frictionIn this paper, from the definition of differential coefficients of static friction, the expressions fordifferential and apparent coefficients of static friction, 〓 and 〓 for several models are deduced.Only 〓 can be measured in experiments, which can be the coefficients on micro or macro scale depending

Keywords： differential coefficients of static friction     coefficients of static friction on micro or nano scale     apparentcoefficients of static friction     coefficients of static friction on macro scale    

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Measurement of activity coefficients at infinite dilution for hydrocarbons in imidazolium-based ionic

ZHU Jiqin, YU Yanmei, CHEN Jian, FEI Weiyang

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 2,   Pages 190-194 doi: 10.1007/s11705-007-0035-3

Abstract: Activity coefficients γ at infinite dilution of a solute in ionic liquid are generally used in the selectionActivity coefficients at infinite dilution of hydrocarbon solutes, such as alkanes, hexenes, alkylbenzenesThe quantitative relations among the computed structure parameters and activity coefficients at infinite

Keywords： cost-saving     consistent     coefficient     measurement     separating    

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Effect of friction coefficients on the dynamic response of gear systems

Lingli JIANG, Zhenyong DENG, Fengshou GU, Andrew D. BALL, Xuejun LI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 397-405 doi: 10.1007/s11465-017-0415-4

Abstract: The change in the lubrication conditions is modeled by the changes in the friction coefficients, therebythe mean and root mean square values calculated by the simulated responses under different friction coefficients

Keywords： dynamic response     friction coefficient     wind loads     wind turbine gearbox    

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Digital image correlation-based structural state detection through deep learning

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 1,   Pages 45-56 doi: 10.1007/s11709-021-0777-x

Abstract: The digital image correlation (DIC) technology was utilized to collect vibration information of an actual

Keywords： structural state detection     deep learning     digital image correlation     vibration signal     steel frame    

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Diagnosis method based on wavelet coefficient scale relativity correlation dimension for fault

GU Junjie, TIAN Jin, PENG Xuezhi

Frontiers in Energy 2008, Volume 2, Issue 2,   Pages 164-168 doi: 10.1007/s11708-008-0031-4

Abstract: Correlation dimension as a tool to describe machinery condition is introduced.conditions are analyzed using a threshold filtering algorithm based on the region relativity of the wavelet coefficientsThe correlation dimension is able to identify conditions of the fan with faults compared with the normal

Keywords： effective technology     monitoring     mechanical equipment     relativity     Correlation    

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Reliability analysis of urban gas transmission and distribution system based on FMEA and correlation

Su LI,Weiguo ZHOU

Frontiers in Energy 2014, Volume 8, Issue 4,   Pages 443-448 doi: 10.1007/s11708-014-0336-4

Abstract: To solve the problem of subjectivity and uncertainty of the multi-expert decision making, the correlationThe results show that correlation operator can directly process the linguistic terms and quantify the

Keywords： and distribution system     risk evaluation     reliability analysis     failure mode and effects analysis (FMEA)     correlation    

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Measurement and correlation of the solid-liquid equilibrium of 2-(

Yanhong SUN, Zhiyong LI, Chuang XIE, Wei CHEN, Cui ZHANG

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 1,   Pages 110-115 doi: 10.1007/s11705-013-1316-7

Abstract: In this work, the enthalpy of fusion and melting points of 2-( -butyl)-5-methylphenol (2B5MP) and 2-( -butyl)-4-methylphenol (2B4MP) were measured by differential scanning calorimetry (DSC). The binary solid-liquid equilibrium (SLE) of both compounds were predicted by integrated computer aided system (ICAS) and measured by DSC. The corresponding eutectic molar composition is 0.6998 and the eutectic temperature is 281.96 K. The quasi-static heat capacities of 2B5MP and 2B4MP were evaluated by stochastic temperature modulation DSC technique (TOPEM). The SLE experimental data were correlated using the Margules, Wilson, and non-random two liquid (NRTL) equations and a good agreement between measurement and calculation could be obtained.

Keywords： solid-liquid equilibrium (SLE)     eutectic     integrated computer aided system (ICAS)     TOPEM     correlation    

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Deformation field and crack analyses of concrete using digital image correlation method

Yijie HUANG, Xujia HE, Qing WANG, Jianzhuang XIAO

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1183-1199 doi: 10.1007/s11709-019-0545-3

Abstract: distribution and crack propagation of concrete under axial compression was conducted by the digital image correlation

Keywords： deformation filed distribution     crack development     digital image correlation method     mechanical properties    

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Free radical scavenging window of infertile patients with polycystic ovary syndrome: correlation with

Bo Huang, Zhou Li, Xinling Ren, Jihui Ai, Lixia Zhu, Lei Jin

Frontiers of Medicine 2017, Volume 11, Issue 2,   Pages 247-252 doi: 10.1007/s11684-017-0519-6

Abstract:

The activity of free radicals in follicular fluid was related to ovarian responsiveness, in vitro fertilization (IVF), and embryo transfer success rate. However, studies analyzing the relationship between the free radical scavenging capacity and embryo quality of infertile women with polycystic ovarian syndrome (PCOS) were lacking. The aim of this study was to evaluate the relationship between the free radical scavenging window of women with PCOS and their embryo quality. The free radical scavenging capacity of follicular fluid from women with PCOS was determined by a,a-diphenyl-b-picrylhydrazyl (DPPH), 2,2-azinobis (3-ethylbenzthiazoline-6-sulphonic acid) assay, superoxide radical, and reactive oxygen species (ROS) assay. In the DPPH and ROS assays, the follicular fluid from grades I and II embryos was significantly higher than the follicular fluid from grades III and IV embryos. The lower control limit of DPPH radical scavenging capacity and upper control limit of ROS level were 13.2% and 109.0 cps, respectively. The calculated lower control limit and upper control limit were further confirmed in the follicular fluid of embryos of all grades. These cut-off values of free radical scavenging activity of follicular fluid could assist embryologists in choosing the development of embryos in PCOS patients undergoing IVF.

Keywords： in vitro fertilization     PCOS     free radical     embryo quality    

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Characteristic and correlation analysis of influent and energy consumption of wastewater treatment plants

Luxi Zou, Huaibo Li, Shuo Wang, Kaikai Zheng, Yan Wang, Guocheng Du, Ji Li

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 6, doi: 10.1007/s11783-019-1167-7

Abstract: Poor biodegradability and insufficient carbon source are discovered from influent. Influent indices presented positively normal distribution or skewed distribution. Average energy consumption of WWTPs in Taihu Basin was as high as 0.458 kWh/m3. Energy consumption increases with the increase in influent volume and COD reduction. The total energy consumption decreases with the NH3-N reduction. The water quality and energy consumption of wastewater treatment plants (WWTPs) in Taihu Basin were evaluated on the basis of the operation data from 204 municipal WWTPs in the basin by using various statistical methods. The influent ammonia nitrogen (NH3-N) and total nitrogen (TN) of WWTPs in Taihu Basin showed normal distribution, whereas chemical oxygen demand (COD), biochemical oxygen demand (BOD5), suspended solid (SS), and total phosphorus (TP) showed positively skewed distribution. The influent BOD5/COD was 0.4%–0.6%, only 39.2% SS/BOD5 exceeded the standard by 36.3%, the average BOD5/TN was 3.82, and the probability of influent BOD5/TP>20 was 82.8%. The average energy consumption of WWTPs in Taihu Basin in 2017 was 0.458 kWh/m3. The specific energy consumption of WWTPs with a daily treatment capacity of more than 5 × 104 m3 in Taihu Basin was stable at 0.33 kWh/m3. A power function relationship was observed between the reduction in COD and NH3-N and the specific energy consumption of pollutant reduction, and the higher the pollutant reduction is, the lower the specific energy consumption of pollutant reduction presents. In addition, a linear relationship existed between the energy consumption of WWTPs and the specific energy consumption of influent volume and pollutant reduction. Therefore, upgrading and operation with less energy consumption of WWTPs is imperative and the suggestions for Taihu WWTPs based on stringent discharge standard are proposed in detail.

Keywords： treatment plant     Influent characteristics     Energy consumption evaluation     Specific energy consumption     SPSS correlation    

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Correlation analysis of couple optical paths for micro stereovision with stereo light microscope

WANG Yuezong, LI Desheng, YU Yaping

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 3,   Pages 288-292 doi: 10.1007/s11465-007-0050-6

Abstract: In this paper, a correlation function is proposed to describe the coupling intension between the coupleExperiments show that the correlation of the optical paths of a common main objective of stereo lightthat of a G-SLM, and the error must be considered when a pinhole imaging model is used to analyze its correlation

Keywords： intension     micromanipulation     correlation function     objective     quantified    

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The Characteristic of Spectrum and Self-correlation of Some Boolean Fuctions Linearly Equivalent to Specific

Yang Rui,Zeng Bensheng,Li Shiqu

Strategic Study of CAE 2005, Volume 7, Issue 11,   Pages 60-65

Abstract: obtained a sufficient and necessary condition about a Boolean function linearly equivalent to some m order correlation-immuneMoreover, it showed an example,in which a given Boolean function, that is not correlation-immuned anddoes not satisfy the propagation criterion can be constructed into a correlation-immuned Boolean function

Keywords： linear equivalence     Walsh cycle spectrum     self-correlation function     correlation-immunity     propagation criterion    

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Title Author Date Type Operation

Smart model for accurate estimation of solar radiation

Lazhar ACHOUR, Malek BOUHARKAT, Ouarda ASSAS, Omar BEHAR

Journal Article

Experimental study of aerodynamic interference effects on aerostatic coefficients of twin deck bridges

Zhiwen LIU , Zhengqing CHEN , Gao LIU , Xinpeng SHAO ,

Journal Article

Calculations of narrow-band transimissities and the Planck mean absorption coefficients of real gases

Huaqiang CHU, Mingyan GU, Huaichun ZHOU, Fengshan LIU

Journal Article

Expressions for Differential and Apparent Coefficients of Static Friction

Wang Weiyuan

Journal Article

Measurement of activity coefficients at infinite dilution for hydrocarbons in imidazolium-based ionic

ZHU Jiqin, YU Yanmei, CHEN Jian, FEI Weiyang

Journal Article

Effect of friction coefficients on the dynamic response of gear systems

Lingli JIANG, Zhenyong DENG, Fengshou GU, Andrew D. BALL, Xuejun LI

Journal Article

Digital image correlation-based structural state detection through deep learning

Journal Article

Diagnosis method based on wavelet coefficient scale relativity correlation dimension for fault

GU Junjie, TIAN Jin, PENG Xuezhi

Journal Article

Reliability analysis of urban gas transmission and distribution system based on FMEA and correlation

Su LI,Weiguo ZHOU

Journal Article

Measurement and correlation of the solid-liquid equilibrium of 2-(

Yanhong SUN, Zhiyong LI, Chuang XIE, Wei CHEN, Cui ZHANG

Journal Article

Deformation field and crack analyses of concrete using digital image correlation method

Yijie HUANG, Xujia HE, Qing WANG, Jianzhuang XIAO

Journal Article

Free radical scavenging window of infertile patients with polycystic ovary syndrome: correlation with

Bo Huang, Zhou Li, Xinling Ren, Jihui Ai, Lixia Zhu, Lei Jin

Journal Article

Characteristic and correlation analysis of influent and energy consumption of wastewater treatment plants

Luxi Zou, Huaibo Li, Shuo Wang, Kaikai Zheng, Yan Wang, Guocheng Du, Ji Li

Journal Article

Correlation analysis of couple optical paths for micro stereovision with stereo light microscope

WANG Yuezong, LI Desheng, YU Yaping

Journal Article

The Characteristic of Spectrum and Self-correlation of Some Boolean Fuctions Linearly Equivalent to Specific

Yang Rui,Zeng Bensheng,Li Shiqu

Journal Article