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Present Situation and Countermeasures of Ecotourism Resources Development in Tibet
Fan Gang,Tang Yumin 아시아사회과학학회 2022 Jornal of Asia Social Science Vol.6 No.2
With the improvement of people s leisure time and the strengthening of the country s development of the western region, the construction of the western region is speeding up, and people s yearning for the mysterious western region is becoming increasingly prominent. Tibet s unique natural ecology and social and historical process have created its unique tourism resources. Plateau, mountains, snow-capped mountains, glaciers, forests, grasslands, lakes, hot springs, geothermal water, etc. constitute a unique natural landscape. Spectacular temples and ancient buildings, strong religious atmosphere and charming eco-tourism resources in Tibet constitute a unique natural wonder, which has great development potential in developing eco-tourism in Tibet. According to the superior conditions of Tibet s eco-tourism resources, this paper starts with the characteristics of Tibet s eco-tourism resources and the development of Tibet s tourism industry, and concludes that there are some problems in the current development of Tibet s eco-tourism resources, such as backward propaganda and development, single types of tourism products, poor infrastructure conditions, lack of effective management, and weak awareness of environmental protection , and analyzes and summarizes the relevant countermeasures for developing Tibet s eco-tourism resources.
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Fan, Gang,Zhang, Lin,Yi, Lu,Jiang, Zhi-Qiang,Ke, Yang,Wang, Xiao-Shan,Xiong, Ying-Ying,Han, Wei-Qin,Zhou, Xiao,Liu, Chun,Yu, Xie Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.8
Purpose: To retrospective assess the potential predictors for relapse and create an effective clinical mode for surveillance after orchidectomy in clinical stage I non-seminomatous germ cell testicular tumors (CSI-NSGCTs). Materials and Methods: We analyzed data for CSI-NSGCTs patients with non-lymphatic vascular invasion, %ECa < 50% (percentage of embryonal carcinoma < 50%), and negative or declining tumor markers to their half-life following orchidectomy (defined as low-risk patients); these patients were recruited from four Chinese centers between January 1999 and October 2013. Patients were divided into active surveillance group and retroperitoneal lymph node dissection (RPLND) group according to different therapeutic methods after radical orchidectomy was performed. The disease-free survival rates (DFSR) and overall survival rates (OSR) of the two groups were compared by Kaplan-Meier analysis. Results: A total of 121 patients with CSI-NSGCT were collected from four centers, and 81 low-risk patients, including 54 with active surveillance and 27 with RPLND, were enrolled at last. The median follow-up duration was 66.2 (range 6-164) months in the RPLND group and 65.9 (range 8-179) months in the surveillance group. OSR was 100% in active surveillance and RPLND groups, and DFSR was 89.8% and 87.0%, respectively. No significant difference was observed between these two groups ($X_2=0.108$, P=0.743). No significant difference was observed between the patients with a low percentage of embryonal carcinoma (<50%) and those without embryonal carcinoma (87.0% and 91.9%, $X_2=0.154$, P=0.645). No treatment-related complications were observed in the active surveillance group whereas minor and major complications were observed in 13.0% and 26.1% of the RPLND group, respectively. Conclusions: Active surveillance resulted in similar DFSR and OSR compared with RPLND in our trial. Patients with low-risk CSI-NSGCTs could benefit from risk-adapted surveillance after these patients were subjected to radical orchidectomy.
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Visualization Analysis of Eco-tourism Resources Development Research in China Based on Citespace
Fan Gang,Liu Chaoyang 아시아사회과학학회 2021 Jornal of Asia Social Science Vol.5 No.3
This paper analyzes the hot spots and cutting-edge topics in the research field of ecotourism resources development in China in recent 10 years, so as to facilitate relevant researchers to understand the research status in this field. Taking the academic papers related to the development and research of ecotourism resources in China from 2010 to 2019 in the Web of Science database as the research object, the co-occurrence of authors, countries, institutions and subject words was analyzed by using the bibliometric visualization software CiteSpace. A total of 13,820 research papers on the development of China s ecotourism resources were published in the search scope, and the number of published papers showed an increasing trend year by year, which attracted wide attention from many disciplines and fields. In recent years, Chinese researchers have carried out extensive and in-depth research on the development of ecotourism resources from various disciplines and fields.
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Two Low-Loss Large Current Rectifiers Based on Low KVA Rating Wye-Connected Autotransformers
Fangang Meng,Zhongcheng Man,Quanhui Li,Lei Gao 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6
In this paper, two large current rectifiers are proposed based on two wye-connected autotransformers. The requirements of the ideal large current rectifier are analyzed, and it is concluded that the large current rectifier has a higher power density and a higher energy conversion efficiency when it is made up of two three-phase half-wave rectifiers and a wye-connected autotransformer. According to theoretical analysis results, the two novel wye-connected autotransformers are designed to feed two three-phase half-wave rectifiers. The two autotransformers can generate two groups of three-phase voltages with a 60o phase shifting, and their kVA ratings account for 95% and 80% of the load power, respectively. These values are less than those of a double star rectifier at 30% and 46%. From the input mains and output side, the power quality of the proposed rectifiers is the same as that of the double star rectifier. Some experiments validate the correctness of the theoretical analysis.
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Fangang Meng,Qingxiao Du,Lei Gao,Quanhui Li,Zhongcheng Man 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2
This paper presents the effect of winding configuration on the kVA rating of a wye-connected autotransformer applied to a 12-pulse rectifier. To describe the winding configuration of the wye-connected autotransformer, position and proportional parameters are defined and their quantitative relation is calculated. The voltages across and currents through the windings are measured under different winding connections. Consequently, a relation between the kVA rating and position parameter is established in accordance with the analysis, and the optimal winding configuration is obtained on the basis of this relation. A wye-connected autotransformer with the least equivalent kVA rating and simplest winding configuration is designed and applied to the 12-pulse rectifier. Simulations and experiments are conducted to validate the theoretical analysis.
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Meng, Fangang,Liu, Wei,Yin, Xinyu,Gao, Lei The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10
To verify the harmonic suppression capability of a series-connected 36-pulse rectifier and to improve the load adaptability of its harmonic injection circuit, a reliable selection method for the DC-side output capacitor of the rectifier is proposed. The sufficient and necessary conditions for ensuring the rectifier can operate under the 36-pulse rectification state is summarized, which is the basis for selecting capacitance values under different load types. After using the proposed selection method for the output capacitors, simulation and experimental results indicate that the hybrid harmonic suppression circuit has good performances under a resistive load, a resistive-inductive load, or a load mutation.
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Two Low-Loss Large Current Rectifiers Based on Low KVA Rating Wye-Connected Autotransformers
Meng, Fangang,Man, Zhongcheng,Li, Quanhui,Gao, Lei The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6
In this paper, two large current rectifiers are proposed based on two wye-connected autotransformers. The requirements of the ideal large current rectifier are analyzed, and it is concluded that the large current rectifier has a higher power density and a higher energy conversion efficiency when it is made up of two three-phase half-wave rectifiers and a wye-connected autotransformer. According to theoretical analysis results, the two novel wye-connected autotransformers are designed to feed two three-phase half-wave rectifiers. The two autotransformers can generate two groups of three-phase voltages with a 60o phase shifting, and their kVA ratings account for 95% and 80% of the load power, respectively. These values are less than those of a double star rectifier at 30% and 46%. From the input mains and output side, the power quality of the proposed rectifiers is the same as that of the double star rectifier. Some experiments validate the correctness of the theoretical analysis.
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Meng, Fangang,Du, Qingxiao,Gao, Lei,Li, Quanhui,Man, Zhongcheng The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2
This paper presents the effect of winding configuration on the kVA rating of a wye-connected autotransformer applied to a 12-pulse rectifier. To describe the winding configuration of the wye-connected autotransformer, position and proportional parameters are defined and their quantitative relation is calculated. The voltages across and currents through the windings are measured under different winding connections. Consequently, a relation between the kVA rating and position parameter is established in accordance with the analysis, and the optimal winding configuration is obtained on the basis of this relation. A wye-connected autotransformer with the least equivalent kVA rating and simplest winding configuration is designed and applied to the 12-pulse rectifier. Simulations and experiments are conducted to validate the theoretical analysis.
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Novel passive harmonic suppression method for series-connected multi-pulse rectifiers
Quanhui Li,Lei Gao,Fangang Meng 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.3
To improve the power quality and reliability of series-connected multi-pulse rectifiers (MPR), a passive harmonic suppression method is proposed in this paper. According to the topology of the rectifier, the operation modes are examined, and the operating waveforms are studied based on the operation modes. Based on the operating waveform of the rectifier, the relationship between the input voltage and the turns ratio of the auxiliary single-phase transformer (AST) is obtained, and the optimal turns ratio of the AST is calculated. The obtained results express that the input voltage THD is 4.4%, and that the input current THD is about 2.6%. The magnetic rating of the AST is only 1.72% of the output power. The proposed passive harmonic suppression method has the advantages of low loss and good harmonic suppression capability.
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Cai, Chunwei,An, Pufeng,Guo, Yuxing,Meng, Fangang The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5
A novel three-phase four-wire inverter topology is presented in this paper. This topology is equipped with a special capacitor balance grid without magnetic saturation. In response to unbalanced load and unequal split DC-link capacitors problems, a qusi-full-bridge DC/DC topology is applied in the balance grid. By using a high-frequency transformer, the energy transfer within the two split dc-link capacitors is realized. The novel topology makes the voltage across two split dc-link capacitors balanced so that the neutral point voltage ripple is inhibited. Under the condition of a stable neutral point voltage, the three-phase four-wire inverter can be equivalent to three independent single phase inverters. As a result, the three-phase inverter can produce symmetrical voltage waves with an unbalanced load. To avoid forward transformer magnetic saturation, the voltages of the primary and secondary windings are controlled to reverse once during each switching period. Furthermore, an improved mode chosen operating principle for this novel topology is designed and analyzed in detail. The simulated results verified the feasibility of this topology and an experimental inverter has been built to test the power quality produced by this topology. Finally, simulation results verify that the novel topology can effectively improve the inhibition of an inverter with a three-phase unbalanced load while decreasing the value of the split capacitor.
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