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Search Results: 1 - 10 of 151544 matches for " Yan Li "
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Modeling of the Unburned Carbon in Fly Ash  [PDF]
Weiping YAN, Jun LI
Energy and Power Engineering (EPE) , 2009, DOI: 10.4236/epe.2009.12014
Abstract: Numerical simulation of the content of unburned carbon in fly ash on the 300MW tangentially pulverized coal fired boiler is performed by the numerical simulation software COALFIRE, which is based on international advanced TASCFLOW software platform. Firstly, take the result of calculation of number value as the sample, and then set up the support vector machine model of unburned carbon content on the boiler. The relative error between the predicted output and measured value is 0.00186%, which proves the modeling is good for the unburned carbon in fly ash predict.
Competitive Innovation Diffusion in Small-World Network: Agent-Based Modeling and Simulation  [PDF]
Yunfeng Yan, Ying Li
Technology and Investment (TI) , 2012, DOI: 10.4236/ti.2012.33028
Abstract: The main purpose of this paper is to analyze the dynamic process when two competitive innovations diffuse simultaneously in the small world network. To illustrate the micro diffusion process, an agent-based modeling and simulation method is applied. In the agent based model, there are two competitive innovations. Agents make decisions to adopt one of the innovations according to the utility value. The sensitivity of the parameters of the utility function is analyzed. The result indicates that in the early stage and the late stage the advertisement strategy is better; while in the middle stage the word-of-mouth will be better.
Dynamic Model Study and Analysis of DME Auto-Thermal Steam Reforming Reaction  [PDF]
Yan Gao, Cong Li
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.35009
Abstract: Through the study of the kinetics of dimethyl ether steam reforming reaction, a two-dimensional model of the reactor is established. At the same time, rate equations of simplified elementary reactions of DME steam reforming reaction are deduced by the mechanism of Langmuir-Hinshel-wood, and the rate constants are obtained by correcting the pre-exponential factor of Arrhenius equation. Finally, the analog data of DME steam reforming reaction under a variety of conditions are obtained, and making a simulation diagram. The two-dimensional model is substantially correct because of the analog data more in line with a variety of knowledge.
Analysis of Prognostic Factors of Children with Intracranial Infection Coma  [PDF]
Yan Peng, Li Jiang
World Journal of Neuroscience (WJNS) , 2015, DOI: 10.4236/wjns.2015.52015
Abstract: Objective: To investigate the prognostic factors of coma due to intracranial infection in children, in order to judge the prognosis of coma earlier and guide appropriate treatment. Methods: 1) Collecting the clinical data of 39 comatose children due to intracranial infection admitted into Department of Neurology in Children’s Hospital of Chongqing Medical University from July to September 2007 and 2009, and analyzing their age and sex distribution, causes of coma, and laboratory examinations retrospectively. 2) Implementing the Glasgow coma score among these children immediately after admission, and collecting the serum and cerebrospinal fluid within 24 - 48 hours, and then measuring the NSE levels. 3) Following up these children 3 months after discharge, and analyzing the relationships among prognosis and age, sex, etiology, protein content in CSF, and NSE levels in Serum and CSF. Results: 1) In the cases studied, the age range was from 9 months to 14 years, the average age was (4.25 ± 2.82) years, and 9 months - 3 years, 3 - 5 years, 5 - 11 years, and ≥11 years were accounted for 33.3%, 30.8%, 30.8%, 5.1% respectively. There were 24 males and 15 females, and the gender ratio (male-to-female) was 1.6:1. 2) The group of 39 patients consists of Japanese encephalitis (23 cases, 59%), Viral encephalitis (5 cases, 12.8%), Tuberculous meningitis (5 cases, 12.8%), Acute disseminated encephalomyelitis (5 cases, 12.8%) and Purulent meningitis (1 cases, 2.6%). 3) CSF examination in 33 cases, protein elevated in 18 cases (54.5%), content between 0.47 and 4.33 g/L. 4) The statistical analysis showed that the causes, CSF protein content, serum and cerebrospinal fluid NSE levels were correlated with the prognosis, and that the age and sex had no correlation with the prognosis. Conclusions: 1) In this group of 39 patients, the incidence of children under 5 years old was the highest, and the incidence of boys was higher than girls. 2) Infectious diseases were the most common cause of coma in children. 3) Cerebrospinal fluid protein content was correlated with the prognosis, and the prognosis was worse as the protein content was higher. 4) NSE was a specific biochemical parameter of pathological damagenerve tissue; serum NSE levels could indirectly reflect the changes in CSF.
Distribution Prediction Correction Based on the Analysis of Job/Housing Balance between Old and New Districts  [PDF]
Tao Li, Hai Yan
Open Journal of Applied Sciences (OJAppS) , 2017, DOI: 10.4236/ojapps.2017.72006
Abstract: The cities of China are in the period of rapid development of urbanization. The practical problems, which faced by urban traffic planning, include an effective prediction for the traffic volume. This paper, combining the example of Cangzhou’s traffic planning, analyzes the differences on land use between the new and the old district, including its influence to the residents. It also analyzes the relationship of travel features and the coefficient of job/housing balance in the new and the old district; furthermore, it corrects the result of traditional gravity model by using balance’s coefficient. Through this study, we find that the corrected model deals with the problem of travel forecasting’s deviation, which is closer to the physic truth. In the meanwhile, we suggested paying more attention to the relationship of land use and housing/jobs in the district plan, in this way, it will reduce the traffic demand radically and optimize the traffic structure.
Value of Thromboelastography in Judging Abnormal Coagulation Function in Patients with Early Hemorrhagic Shock  [PDF]
Yiwu Yan, Jinjun Li
International Journal of Clinical Medicine (IJCM) , 2019, DOI: 10.4236/ijcm.2019.102007
Abstract: Objective: To detect the changes of coagulation function in patients with early hemorrhagic shock by thromboelastography (TEG). Methods: TEG was performed in 50 patients with early hemorrhagic shock and surgical indications. The TEG parameters were compared with 50 healthy people. The coagulation and fibrinolysis in patients with early hemorrhagic shock were observed. Results: In terms of coagulation parameters, the R value decreased, the α angle increased, and the K value and MA value did not change significantly in patients with early hemorrhagic shock. Fibrinolytic aspects: EPL, LY30 observations have no significant changes compared to normal values. Conclusion: The plasma coagulation factor activity is increased in patients with early hemorrhagic shock; the fibrin level is increased; the blood is in a hypercoagulable state; and the fibrinolysis function is not changed. The timely detection of TEG can be used for coagulation function monitoring and blood transfusion therapy in patients with surgical hemorrhagic shock. It provides an important basis for preventing the formation of deep vein thrombosis.
The Analysis of Pingyao Ancient Town Street Spaces and View Spots Reachability by Space Syntax  [PDF]
Dengfei Li, Xianchun Yan, Yan Yu
Journal of Data Analysis and Information Processing (JDAIP) , 2016, DOI: 10.4236/jdaip.2016.44015
Abstract: The Pingyao ancient town is one of the four largest ancient cities in China. This study analyzes street spaces characteristic and view spots reachability of the Pingyao ancient town using space syntax. Then, it is concluded that the integration and reachability of street spaces are relatively higher in the northern ancient town; the accessibility among street spaces is relatively higher in the northeastern ancient town; and most of the ancient town street spaces are very open. Furthermore, the reachability of 14 view spots and their 4 corresponding street spaces is relatively higher in the 20 view spots and their 9 corresponding street spaces. Finally, some suggestions are presented to the tourism development of Pingyao ancient town based on the above conclusions.
Study on the Synergetic Mechanism for the Dynamic Evaluation of Electricity Market Operational Efficiency  [PDF]
Chunjie Li, Li Yan, Huiru Zhao
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.33046
Abstract: In Synergetics, when a complex system evolves from one sate to another, the order parameter plays a dominant role. We can analyze the complex system state by studying the dynamic of order parameter. We developed a synergetic model of electricity market operation system, and studied the dynamic process of the system with empirical example, which revealed the internal mechanism of the system evolution. In order to verify the accuracy of the synergetic model, fourth-order Runge-Kutta algorithm and grey relevance method were used. Finally, we found that the reserve rate of generation was the order parameter of the system. Then we can use the principle of Synergetics to evaluate the efficiency of electricity market operation.
1 Case Clinical Report of Cranium Aggressive Fibromatosis and Literature Review  [PDF]
Qi Yan, Ming Li, Jintao Li
International Journal of Clinical Medicine (IJCM) , 2015, DOI: 10.4236/ijcm.2015.610098
Abstract: Objective: The purpose of this study is to explore the clinical characteristics and therapeutic methods of aggressive fibromatosis (AF) in skull. Methods: The clinical data and operative therapy of one case of aggressive fibromatosis in skull in our department were examined and reviewed. The associated literatures were reviewed and discussed. Results: It was indicated that the main manifestation of AF in skull was headache and skull tumor. There was prominent osteolytic destruction found in X-ray plain film for skull AF. And CT scanning showed that skull sclerotin was disorganized and inhomogeneous, with widen diploe. The skull fibromatosis constituted by fibroblasts and myofibroblas, which were mainly spindle-shaped without heteromorphism. Immunohistochemistry showed positive expression of β-catenin and Vim in these cells. The enlarged incision was adopted for the strategy of operation in this patient of skull AF. After follow-up, there was no recurrence of AF discovered. Conclusions: Skull AF is very rare in neurosurgical clinic. The clinical manifestation and iconography of AF were lack of specificity. Therefore, skull AF is hard to diagnose preoperatively. The effective diagnose is mainly dependant on histopathologic examination. As for treatment, operation is the most optimal method so far, which has a good therapeutic effect.
Plasminogen Activator Inhibitor-1 4G/5G Gene Polymorphism and Coronary Artery Disease in the Chinese Han Population: A Meta-Analysis
Yan-yan Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0033511
Abstract: Background The polymorphism of plasminogen activator inhibitor-1 (PAI-1) 4G/5G gene has been indicated to be correlated with coronary artery disease (CAD) susceptibility, but study results are still debatable. Objective and Methods The present meta-analysis was performed to investigate the association between PAI-1 4G/5G gene polymorphism and CAD in the Chinese Han population. A total of 879 CAD patients and 628 controls from eight separate studies were involved. The pooled odds ratio (OR) for the distribution of the 4G allele frequency of PAI-1 4G/5G gene and its corresponding 95% confidence interval (CI) was assessed by the random effect model. Results The distribution of the 4 G allele frequency was 0.61 for the CAD group and 0.51 for the control group. The association between PAI-1 4G/5G gene polymorphism and CAD in the Chinese Han population was significant under an allelic genetic model (OR = 1.70, 95% CI = 1.18 to 2.44, P = 0.004). The heterogeneity test was also significant (P<0.0001). Meta-regression was performed to explore the heterogeneity source. Among the confounding factors, the heterogeneity could be explained by the publication year (P = 0.017), study region (P = 0.014), control group sample size (P = 0.011), total sample size (P = 0.011), and ratio of the case to the control group sample size (RR) (P = 0.019). In a stratified analysis by the total sample size, significantly increased risk was only detected in subgroup 2 under an allelic genetic model (OR = 1.93, 95% CI = 1.09 to 3.35, P = 0.02). Conclusions In the Chinese Han population, PAI-1 4G/5G gene polymorphism was implied to be associated with increased CAD risk. Carriers of the 4G allele of the PAI-1 4G/5G gene might predispose to CAD.
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