Gas-solid two-phase flow theory was used to predict dust distribution and movement at the working face of a mine.The software package FLUENT was used to numerically simulate dust motion and the results were compared t...Gas-solid two-phase flow theory was used to predict dust distribution and movement at the working face of a mine.The software package FLUENT was used to numerically simulate dust motion and the results were compared to observed data.The simulation agrees with the data taken from an actual working face,which confirms the choice of mathematical model and numerical simulation method. Using the model we predict a set of conditions optimum for reducing dust concentrations at the mine working face.展开更多
The rapid development of industry application products has greatly influenced society. It has become essential for some telecommunication companies to focus on customer satisfaction with industrial products used by th...The rapid development of industry application products has greatly influenced society. It has become essential for some telecommunication companies to focus on customer satisfaction with industrial products used by the government and enterprise customers. Following the review of a previous study of customer satisfaction and with the help of experiential level theory,this article attempts to establish a Satisfaction Factors Model for researching customer satisfaction with industry applications. We chose a product named "Mobile Monitor" and investigated the emotional satisfaction of 127 users and company leaders from different walks of life,and showed that 7 of the product's features affected the customers' overall emotional satisfaction. Lastly,this paper points out management implications of this application based on quantitative results. It presents a preliminary exploration program for customer satisfaction research in this specific field. The empirical research on a specific product based on experimental level theory may serve as a reference for other companies that desire to carry out similar surveys in future.展开更多
Vanillin 1, 2-propylene glycol acetal was synthesized from vanillin and 1, 2-propylene glycol using H3PMo6W6O40·nH2O as catalyst, The factors influencing the synthesis were discussed and the better reaction condi...Vanillin 1, 2-propylene glycol acetal was synthesized from vanillin and 1, 2-propylene glycol using H3PMo6W6O40·nH2O as catalyst, The factors influencing the synthesis were discussed and the better reaction conditions were found as follows： The amount of vanillin was 3.8 g, the molar ratio of vanillin was 1, 2-propylene glycol 1.0 to 2.4, the amount of catalyst was 1.6% in proportion to the total reacting materials, the volume ofcyclohexane as the water-carrying agent 4 mL, the refluxing time was 2 h at 88-96℃ and thus the product yield reached over 87%. The results show that the catalyst＇s activity is high and the reaction time is short.展开更多
Effective regional budget may significantly affect the development of province in Indonesia. Subsidy from central government heavily composed in regional budget. This shows low real regional income which means distric...Effective regional budget may significantly affect the development of province in Indonesia. Subsidy from central government heavily composed in regional budget. This shows low real regional income which means districts are still depending on budget from central government in general. This research aims to analyze some local factors that affect the regional growth and poverty in 28 provinces in Indonesia. Data panel and heterogeneous regression would be employed in the research. Real regional income, transfer revenue, and labor are the most significant factors to regional growth differently, but it has a different sign as well as the poverty rate. Heterogeneous regression may give better model analysis than the simple one.展开更多
Focusing on the vibration of the roadbed and ground induced by high-speed train load, a three dimensional finite element model which includes the roadbed and horizontal layered site is established to study how the sit...Focusing on the vibration of the roadbed and ground induced by high-speed train load, a three dimensional finite element model which includes the roadbed and horizontal layered site is established to study how the site conditions, the load moving speed and the depth of the soil element influence the soil element stress response. Based on a track-subsoil analytical model in which the rail is simulated as an Euler-Bernoulli beam resting on Winkler foundation in the vertical plane, the reaction force between the sleeper and roadbed excited by a single axle is presented, and then that is exerted on relevant elements to simulate the moving load. The dynamic response in the roadbed and subsoil excited by a single axle moving load is computed based on the parallel computing platform of the ABAQUS finite element software, and the stress time-history, stress path and curves of the principal stress axes rotation of the soil element under the track are presented. The results show that： the soil element stress path is an apple-shaped curve in the horizontal shear stress τd versus the stress difference （σsh - σch ）/2 coordinate system; the principal stress axes rotate 180° for the soil element under the load moving line during the load running, and the stress state changes from the pure shear to triaxial shear and then back to the pure shear again. The element dynamic stress increases as the moving load speed increases, which increases sharply when the load speed approaches the Rayleigh wave velocity of soil layer; the site conditions and the soil element depth affect the soil element stress path significantly.展开更多
OBJECTIVE:To review and discuss the Chinese and English literature on the use of pain-related evoked potentials(PREP) and short-latency somatosensory EP(SLSEP) in acupuncture research.METHODS:China National Knowledge ...OBJECTIVE:To review and discuss the Chinese and English literature on the use of pain-related evoked potentials(PREP) and short-latency somatosensory EP(SLSEP) in acupuncture research.METHODS:China National Knowledge Infrastructure Database and MEDLINE were searched for the following key words:acupuncture and PREP or SLSEP.RESULTS:Thirty-seven articles were included in the review.Researchers usually use PREPs to study the analgesic effect of acupuncture,observe influential factors,or for mechanistic exploration.In the SLSEP studies,researchers focused on response characteristics of acupuncture,acupoint specificity,and influential factors of the treatment.There were some problems with the study design and conclusions.CONCLUSION:Researchers could use PREP and SLSEP to objectively validate the effects of acupuncture and explore its mechanisms using nerve electrophysiology.Further studies can benefit from observing more acupoints' effects using PREPs or SLSEPs and investigating the placebo effect of acupuncture.展开更多
基金supported by the Special Foundation for Doctor Degree of the Ministry of Education(No.2006008001)the Construction Project of Beijing Municipal Education Committee (No.XK100080432)the Joint Development Project of Beijing.
文摘Gas-solid two-phase flow theory was used to predict dust distribution and movement at the working face of a mine.The software package FLUENT was used to numerically simulate dust motion and the results were compared to observed data.The simulation agrees with the data taken from an actual working face,which confirms the choice of mathematical model and numerical simulation method. Using the model we predict a set of conditions optimum for reducing dust concentrations at the mine working face.
基金supported by the Research on Group Customers Satisfaction of Hubei Telecom
文摘The rapid development of industry application products has greatly influenced society. It has become essential for some telecommunication companies to focus on customer satisfaction with industrial products used by the government and enterprise customers. Following the review of a previous study of customer satisfaction and with the help of experiential level theory,this article attempts to establish a Satisfaction Factors Model for researching customer satisfaction with industry applications. We chose a product named "Mobile Monitor" and investigated the emotional satisfaction of 127 users and company leaders from different walks of life,and showed that 7 of the product's features affected the customers' overall emotional satisfaction. Lastly,this paper points out management implications of this application based on quantitative results. It presents a preliminary exploration program for customer satisfaction research in this specific field. The empirical research on a specific product based on experimental level theory may serve as a reference for other companies that desire to carry out similar surveys in future.
文摘Vanillin 1, 2-propylene glycol acetal was synthesized from vanillin and 1, 2-propylene glycol using H3PMo6W6O40·nH2O as catalyst, The factors influencing the synthesis were discussed and the better reaction conditions were found as follows： The amount of vanillin was 3.8 g, the molar ratio of vanillin was 1, 2-propylene glycol 1.0 to 2.4, the amount of catalyst was 1.6% in proportion to the total reacting materials, the volume ofcyclohexane as the water-carrying agent 4 mL, the refluxing time was 2 h at 88-96℃ and thus the product yield reached over 87%. The results show that the catalyst＇s activity is high and the reaction time is short.
文摘Effective regional budget may significantly affect the development of province in Indonesia. Subsidy from central government heavily composed in regional budget. This shows low real regional income which means districts are still depending on budget from central government in general. This research aims to analyze some local factors that affect the regional growth and poverty in 28 provinces in Indonesia. Data panel and heterogeneous regression would be employed in the research. Real regional income, transfer revenue, and labor are the most significant factors to regional growth differently, but it has a different sign as well as the poverty rate. Heterogeneous regression may give better model analysis than the simple one.
文摘Focusing on the vibration of the roadbed and ground induced by high-speed train load, a three dimensional finite element model which includes the roadbed and horizontal layered site is established to study how the site conditions, the load moving speed and the depth of the soil element influence the soil element stress response. Based on a track-subsoil analytical model in which the rail is simulated as an Euler-Bernoulli beam resting on Winkler foundation in the vertical plane, the reaction force between the sleeper and roadbed excited by a single axle is presented, and then that is exerted on relevant elements to simulate the moving load. The dynamic response in the roadbed and subsoil excited by a single axle moving load is computed based on the parallel computing platform of the ABAQUS finite element software, and the stress time-history, stress path and curves of the principal stress axes rotation of the soil element under the track are presented. The results show that： the soil element stress path is an apple-shaped curve in the horizontal shear stress τd versus the stress difference （σsh - σch ）/2 coordinate system; the principal stress axes rotate 180° for the soil element under the load moving line during the load running, and the stress state changes from the pure shear to triaxial shear and then back to the pure shear again. The element dynamic stress increases as the moving load speed increases, which increases sharply when the load speed approaches the Rayleigh wave velocity of soil layer; the site conditions and the soil element depth affect the soil element stress path significantly.
基金Supported by the National Basic Research Program of China(973 Program)-the Effect of De Qi on Acupoint Specific Effect Based on Meridians and its Characteristics and Molecular Response Mechanisms(No.2012CB518506)Research on Acupoint Specificity in Regulating Uterus(No.2006CB504503)+2 种基金Research on Laws of Acupoint Effects(No.2005CB523308)National Natural Science Foundation of China-Traditional Acupuncture Formula for Inducing Labor(Hegu-Sanyinjiao,LI4-SP6)Electro-acupuncture Parameter Optimization and Molecular Response Mechanisms(No.30973793)the Doctoral Program of Higher Education of Ministry Education of China-Research Based on Primary Dysmenorrhea on Electric Characteristics of Acupoints Which Were Different Ones on the Same Meridians or Similar Ones on the Different Meridians(No.20090013110005)
文摘OBJECTIVE:To review and discuss the Chinese and English literature on the use of pain-related evoked potentials(PREP) and short-latency somatosensory EP(SLSEP) in acupuncture research.METHODS:China National Knowledge Infrastructure Database and MEDLINE were searched for the following key words:acupuncture and PREP or SLSEP.RESULTS:Thirty-seven articles were included in the review.Researchers usually use PREPs to study the analgesic effect of acupuncture,observe influential factors,or for mechanistic exploration.In the SLSEP studies,researchers focused on response characteristics of acupuncture,acupoint specificity,and influential factors of the treatment.There were some problems with the study design and conclusions.CONCLUSION:Researchers could use PREP and SLSEP to objectively validate the effects of acupuncture and explore its mechanisms using nerve electrophysiology.Further studies can benefit from observing more acupoints' effects using PREPs or SLSEPs and investigating the placebo effect of acupuncture.
