Skip to main content Accessibility help

We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.

Close cookie message
×
  1. Home
  2. Search

Refine search

Refine search

Access:
Content type:
Publication date:
Apply   From and To filters
Subject: Show more
Journals Show more
Publishers: Show more
Societies Show more
Series: Show more
Collections: Show more

Actions for selected content:

Select all | Deselect all
  • View selected items
  • Export citations
  • Download PDF (zip)
  • Save to Kindle
  • Save to Dropbox
  • Save to Google Drive

Save Search

You can save your searches here and later view and run them again in "My saved searches".

Please provide a title, maximum of 40 characters.
Cancel
×

4 results

  • Single-frequency and free-running operation of a single-pass pulsed Ho:YLF amplifier

  • Yunpeng Wang, Youlun Ju, Tongyu Dai, Dong Yan, Baoquan Yao
  • Journal:
    High Power Laser Science and Engineering / Volume 8 / 2020
    Published online by Cambridge University Press:
    11 November 2020, e39
    • Article
      • You have access
      • Open access
    • PDF
    • HTML
    • Export citation

  • A single-frequency pulsed holmium-doped yttrium lithium fluoride (Ho:YLF) amplifier pumped by a Tm-doped fiber laser was demonstrated. The seed was an injection-seeded Q-switched Ho:YLF laser. The output energy from the single-frequency pulsed amplifier was 24.2 mJ, with a pulse width of 250 ns at a pulse repetition frequency (PRF) of 100 Hz. The energy stability during 30 min was improved to 1% after the single-frequency pulsed Ho:YLF laser was amplified. The line width of the single-frequency pulsed spectrum of the Ho:YLF amplifier was 2.81 MHz. The single-frequency pulsed Ho:YLF amplifier can be applied to differential absorption lidar (DIAL), since its output spectrum is around the P12 CO2 absorption line.

  • COVID-19 pandemic: study on simple, easy, and practical relaxation techniques while wearing medical protective equipment

  • Huiqin Zhang, Aimin Li, Boheng Zhu, Yanyan Niu, Zheng Ruan, Lihong Liu, Xiaoling Gao, Kun Wang, Lu Yin, Mao Peng, Qing Xue, Haixia Leng, Baoquan Min, Qing Tian, Chunxue Wang, Yuan Yang, Zhou Zhu, Tianmei Si, Wei Li, Fangfang Shangguan, Xia Hong, Hong Chang, Haiqing Song, Dongning Li, Longbin Jia, Huiqing Dong, Yuping Wang, Fiammetta Cosci, Hongxing Wang
  • Journal:
    Psychological Medicine / Volume 52 / Issue 7 / May 2022
    Published online by Cambridge University Press:
    24 August 2020, pp. 1386-1392
    Print publication:
    May 2022
    • Article
      • You have access
      • Open access
    • PDF
    • HTML
    • Export citation
  • Background

    No studies have reported on how to relieve distress or relax in medical health workers while wearing medical protective equipment in coronavirus disease 2019 (COVID-19) pandemic. The study aimed to establish which relaxation technique, among six, is the most feasible in first-line medical health workers wearing medical protective equipment.

    Methods

    This was a two-step study collecting data with online surveys. Step 1: 15 first-line medical health workers were trained to use six different relaxation techniques and reported the two most feasible techniques while wearing medical protective equipment. Step 2: the most two feasible relaxation techniques revealed by step 1 were quantitatively tested in a sample of 65 medical health workers in terms of efficacy, no space limitation, no time limitation, no body position requirement, no environment limitation to be done, easiness to learn, simplicity, convenience, practicality, and acceptance.

    Results

    Kegel exercise and autogenic relaxation were the most feasible techniques according to step 1. In step 2, Kegel exercise outperformed autogenic relaxation on all the 10 dimensions among the 65 participants while wearing medical protective equipment (efficacy: 24 v. 15, no space limitation: 30 v. 4, no time limitation: 31 v. 4, no body position requirement: 26 v. 4, no environment limitation: 30 v. 11, easiness to learn: 28 v. 5, simplicity: 29 v. 7, convenience: 29 v. 4, practicality: 30 v. 14, acceptance: 32 v. 6).

    Conclusion

    Kegel exercise seems a promising self-relaxation technique for first-line medical health workers while wearing medical protective equipment among COVID-19 pandemic.

  • Ultrafine-grained microstructure in a Cu–Zn alloy produced by electropulsing treatment

  • Yizhou Zhou, Wei Zhang, Baoquan Wang, Jingdong Guo
  • Journal:
    Journal of Materials Research / Volume 18 / Issue 8 / August 2003
    Published online by Cambridge University Press:
    31 January 2011, pp. 1991-1997
    Print publication:
    August 2003

  • High-current-density electropulsing was applied to a coarse-grained Cu–Zn alloy with two phases of α-phase and β′-phase. It was found that with an electropulsing treatment, ultrafine-grained (UFG) microstructure could be formed in the α-phase, but could not be formed in the β-phase. The results indicated that the formation of UFG microstructure was dependent on solid-state phase transformation. The main reason for the formation of UFG microstructure by electropulsing treatment resulted from the effect of a decrease in thermodynamic barrier and enhancement of nucleation rate in a current-carrying system, but not from the high heating and cooling rate during electropulsing treatment. The bulk UFG samples prepared by electropulsing treatment were free of porosity and contamination and had no large microstrain. It was reasonable to anticipate that a new method might be developed to produce ideal bulk UFG samples directly from the conventional coarse-grained materials by application of electropulsing.

  • Grain refinement and formation of ultrafine-grained microstructure in a low-carbon steel under electropulsing

  • Yizhou Zhou, Wei Zhang, Baoquan Wang, Guanhu He, Jingdong Guo
  • Journal:
    Journal of Materials Research / Volume 17 / Issue 8 / August 2002
    Published online by Cambridge University Press:
    31 January 2011, pp. 2105-2111
    Print publication:
    August 2002

  • High current electropulsing was applied to a low-carbon steel in the solid state. The relationship between grain size and experimental conditions was revealed. It was found that the ultrafine-grained (UFG) microstructure could be formed when electric current density, heating rate, and cooling rate all were high. The UFG samples prepared by applying electropulsing were free of porosity and contamination, and had no large microstrain. Also, their tensile strength was dramatically enhanced over that of their coarse-grained counterparts, without a decrease in ductility. The mechanism for grain refinement and formation of the UFG microstructure was discussed. It is proposed that the effect of a decrease in thermodynamic barrier and enhancement of nucleation rate in a current-carrying system cannot be neglected.