Science Discovery

Volume 10, Issue 5, October 2022

  • Precision and Efficiency of the Method of Moments Applied to the Functional Functions with Fold Points

    Qingqiu Zhou, Junjie Wang

    Issue: Volume 10, Issue 5, October 2022
    Pages: 279-285
    Received: Aug. 07, 2022
    Accepted: Sep. 01, 2022
    Published: Sep. 05, 2022
    DOI: 10.11648/j.sd.20221005.11
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    Abstract: In the reliability theory, the moment method proposed by Zhao obtains the first fourth order moments of the structural function by the point estimation method based on Gauss-Emhart integral, assuming that the functional function satisfies a specific distribution or the approximate probability distribution function of the functional function is obta... Show More
  • Influence of Flow Channel Structure on Battery Thermal Management Performance

    Yang Sun, Vladislav Mitin, Jintao Jin, Kejun Zhu, Xipo Lu

    Issue: Volume 10, Issue 5, October 2022
    Pages: 286-291
    Received: Aug. 09, 2022
    Accepted: Sep. 07, 2022
    Published: Sep. 08, 2022
    DOI: 10.11648/j.sd.20221005.12
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    Abstract: Effective battery thermal management is crucial to the design of high performance and durable batteries for electric vehicles. In order to reduce the flow resistance of the traditional straight linear flow channel, the author proposed a divergent-shaped channel. In this paper, a battery thermal management model was established for the design of div... Show More
  • Improved Multilevel PWM Strategy Based on Control Carrier Freedom

    Qiao He, Zhao Ziqi, Liu Ming

    Issue: Volume 10, Issue 5, October 2022
    Pages: 292-299
    Received: Aug. 30, 2022
    Accepted: Sep. 22, 2022
    Published: Sep. 28, 2022
    DOI: 10.11648/j.sd.20221005.13
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    Abstract: Cascade multilevel inverte are widely concerned for it large number of levels, minimizes the of switching devices, large transmission power, and so on. However, the output waveform quality depends on the selection of pulse width modulation strategy. With the increase of the number of cascaded units and the output voltage level, it is of great signi... Show More
  • Discussion on the Construction of Urban Transportation Brain in New Era

    Ma Xiaoyi, Xu Liang, Jiang Xuefeng

    Issue: Volume 10, Issue 5, October 2022
    Pages: 300-305
    Received: Sep. 08, 2022
    Accepted: Oct. 05, 2022
    Published: Oct. 11, 2022
    DOI: 10.11648/j.sd.20221005.14
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    Abstract: The transformation of the economy from high-speed to high-quality development in the new era urgently requires more accurate transportation support and guidance. The construction of the urban transportation brain will help achieve the goal of "more accurate". Reviewing the emergence of the concept of "urban transportation brain", analyzing the adva... Show More
  • EPC Procurement Model in China to Reduce the Project Direct Cost

    Lan Zhang, Hao Hu, Jian Chen, Aiguo Huang

    Issue: Volume 10, Issue 5, October 2022
    Pages: 306-313
    Received: Sep. 07, 2022
    Accepted: Sep. 29, 2022
    Published: Oct. 11, 2022
    DOI: 10.11648/j.sd.20221005.15
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    Abstract: Low profit margin is a common issue for construction companies globally, especially for Chinese contractors. In this study, we aim to reduce the project direct cost using the procurement model to enable the contractors to increase their profit at the project level in China. The traditional procurement method used by Chinese contractors is to divide... Show More
  • Research on Green Development Strategy of Urban Park Based on Pedestrian Simulation

    Wei Gan, Zongyu Hong, Kaimin Liu

    Issue: Volume 10, Issue 5, October 2022
    Pages: 314-322
    Received: Sep. 15, 2022
    Accepted: Oct. 10, 2022
    Published: Oct. 17, 2022
    DOI: 10.11648/j.sd.20221005.16
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    Abstract: With the rapid progress of urbanization, a large number of urban parks have been left idle and wasted because their spatial quality does not meet the needs of current users. Based on field research, this study uses pedestrian simulation methods to simulate the exploration of space by pedestrians in urban parks at the micro level over a period of ti... Show More
  • Preparation and Property Study on Poly(vinyl alcohol) Aqueous Film

    Yuanpeng Li, Jingjing Du

    Issue: Volume 10, Issue 5, October 2022
    Pages: 323-327
    Received: Sep. 01, 2022
    Accepted: Oct. 09, 2022
    Published: Oct. 17, 2022
    DOI: 10.11648/j.sd.20221005.17
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    Abstract: With good water solubility and decomposition, poly(vinyl alcohol) (PVA) with low degree of polymerization used as non-fiber, has obvious advantages than commercial PVA and has a broad development prospect. However, the degree of polymerization of commercial PVA ranges from 300 to 2600 and it is hardly to get a smaller degree of polymerization by ge... Show More
  • Practice of Life Safety Information Warning Management for Patients with Loss of Consciousness in Outpatients of General Hospital

    Wang Danting, Fan Yanmei, Wang Lijuan, Li Jie

    Issue: Volume 10, Issue 5, October 2022
    Pages: 328-331
    Received: Aug. 12, 2022
    Accepted: Oct. 17, 2022
    Published: Oct. 24, 2022
    DOI: 10.11648/j.sd.20221005.18
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    Abstract: To explore the effect of life safety information warning management for patients with loss of consciousness in outpatient department of general hospital. The patients with loss of consciousness in outpatients of the Second Affiliated Hospital of Xi 'an Jiaotong University were given life safety information warning management along with routine medi... Show More
  • Research on Fault Location of Distribution Network with DG Based on HHO

    Yan Xin, Liu Ruichen, Tu Naiwei, Xing Jiaqi

    Issue: Volume 10, Issue 5, October 2022
    Pages: 332-339
    Received: Sep. 20, 2022
    Accepted: Oct. 18, 2022
    Published: Oct. 24, 2022
    DOI: 10.11648/j.sd.20221005.19
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    Abstract: Power generation, transmission, transformation, distribution and use are several important links in the power system, of which the distribution link is the most important. Since the 18th National Congress of the CPC, with the acceleration of carbon peaking and carbon neutrality process, clean energy such as solar power generation, wind power genera... Show More
  • Research on Rice Nitrogen Nutrition Diagnosis System Based on Deep Learning Model and Android

    Qiang Yao, Bin Lyu, Chao Su, Bo Li

    Issue: Volume 10, Issue 5, October 2022
    Pages: 340-346
    Received: Sep. 16, 2022
    Accepted: Oct. 20, 2022
    Published: Oct. 24, 2022
    DOI: 10.11648/j.sd.20221005.20
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    Abstract: Nitrogen nutrition diagnosis is one of the key technologies to achieve high quality and high yield in rice. It is time-consuming and laborious to use traditional diagnosis methods of rice nitrogen nutrition. Rapid and intelligent diagnosis of rice nitrogen nutrition can be realized by using smart phones and image recognition technology. In order to... Show More
  • Study on the Spatial Pattern and Influencing Factors of Life Elements in Jiumiao Site of Chang'an City in Han Dynasty Based on POI Data

    Zhang Ziyu, Yu Xiaohui

    Issue: Volume 10, Issue 5, October 2022
    Pages: 347-360
    Received: Sep. 20, 2022
    Accepted: Oct. 24, 2022
    Published: Oct. 27, 2022
    DOI: 10.11648/j.sd.20221005.21
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    Abstract: The overlapping of industrial remains and historical relics in the Nine temple ritual building site of Chang 'an City of Han Dynasty restricts the renewal and development of the area, and further affects the improvement of the quality of life of the native residents. Research based on the POI data with other multi-source data, using the kernel dens... Show More
  • Software Excel Assists College Mathematics Teaching

    Liang Haibin, Ling Haiqing

    Issue: Volume 10, Issue 5, October 2022
    Pages: 361-365
    Received: Sep. 22, 2022
    Accepted: Oct. 20, 2022
    Published: Oct. 27, 2022
    DOI: 10.11648/j.sd.20221005.22
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    Abstract: The cultivation of mathematics application ability is an important purpose in college mathematics teaching, and it is also a weak link. The significance of introducing Excel software in college mathematics courses is to improve students' learning efficiency and interest, and to cultivate students' ability to use mathematical knowledge to solve prac... Show More
  • Design of Question Answering System in Substation Fault Field Based on Knowledge Graph

    He Jun, Wu Sheng Ke, Rao Fang Xi, Zhong Ke Jia, Liu Peng Zheng, Sun Jian Ming

    Issue: Volume 10, Issue 5, October 2022
    Pages: 366-373
    Received: Sep. 26, 2022
    Accepted: Oct. 27, 2022
    Published: Oct. 29, 2022
    DOI: 10.11648/j.sd.20221005.23
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    Abstract: The operation and maintenance of substation equipment is of great significance to ensure the safety and stability of the power grid. In order to summarize the historical operation and maintenance experience of substation equipment and facilitate the management personnel to uniformly manage and accurately query the historical data of substation faul... Show More