Science Discovery

Volume 8, Issue 1, February 2020

  • Photometry Under the Condition of "Precision Rule"

    Yuan Bingjian, Ren Ping

    Issue: Volume 8, Issue 1, February 2020
    Pages: 1-6
    Received: 07 January 2020
    Accepted:
    Published: 26 February 2020
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    Abstract: Taking the determination of manganese in iron and steel as an example, it is proved that following the "precision rule", that is, “to maintain infection consistency of each factor for the each sample in the same measurement series”, the "content determination series" of photometry will present its "content absorption law": In the absorbance domain ... Show More
  • Study on Working Diagnosis of Rod Pumping Wells Based on Machine Learning

    Peng Gao, Xuefeng Jin, Jieyu Du, Yu Han, Yanhui Zhu

    Issue: Volume 8, Issue 1, February 2020
    Pages: 7-11
    Received: 06 February 2020
    Accepted:
    Published: 17 April 2020
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    Abstract: The working condition diagnosis of pumping wells is an important basis for judging it's running condition. For a long time, indicator diagram is used to solve the wave equation by mathematical method to get the downhole pump indicator diagram which is obtained to judge and analyze the working condition of oil pumping equipment. In recent years, wit... Show More
  • Finite Element Analysis and Parameter Influence of Non-developable Ruled Surface Impeller Blade in Flank Milling

    Yu Sun, Lixin Cao

    Issue: Volume 8, Issue 1, February 2020
    Pages: 12-17
    Received: 03 April 2020
    Accepted:
    Published: 19 May 2020
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    Abstract: Through the cutting simulation of titanium alloy impeller blade, the effect of the actual milling processing path on the elastic part deflection to of complicated thin-walled workpiece with low rigidity and high precision is studied. Use the principle of impeller modeling to model the spline of the impeller, and the spline curve of the impeller gen... Show More
  • Detection Method of Chest X-ray Lung Nodules Based on Improved YOLOV3 Model

    Yan Sitao

    Issue: Volume 8, Issue 1, February 2020
    Pages: 18-23
    Received: 11 April 2020
    Accepted:
    Published: 19 May 2020
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    Abstract: Lung cancer is a kind of cancer with high lethality in the world, and the detection of lung nodules becomes particularly important in the early clinical manifestations of lung cancer. However, due to the characteristics of the small size of the lung nodules on the front of the chest and the obstruction of the ribs, it is more difficult to manually ... Show More
  • Prognostic Analysis of Acute Pancreatitis with Fatty Liver

    Jingyi Liu, Dongyuan Su

    Issue: Volume 8, Issue 1, February 2020
    Pages: 24-26
    Received: 04 March 2020
    Accepted:
    Published: 19 May 2020
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    Abstract: Objective: To investigate the effects of fatty liver on the progression and prognosis of acute pancreatitis. METHODS: 538 patients with acute pancreatitis admitted to our department from January 2014 to September 2018 were enrolled, including 210 patients with fatty liver disease and 328 patients without fatty liver. The two groups were retrospecti... Show More