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滴水计时器数学模型的构建
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作者 阮伟卿 《科技创新与生产力》 2022年第11期22-25,共4页
由于滴水计时是用水滴累计的重量或者体积来指示时间,因此单个水滴重量或者单个水滴体积与单个水滴时间的关系,成为滴水计时的关键。本文应用水表面张力的计算公式和伯努利方程,构建了一个水滴重量与滴管的内径、滴管的外径、水面高度... 由于滴水计时是用水滴累计的重量或者体积来指示时间,因此单个水滴重量或者单个水滴体积与单个水滴时间的关系,成为滴水计时的关键。本文应用水表面张力的计算公式和伯努利方程,构建了一个水滴重量与滴管的内径、滴管的外径、水面高度和时间关系的数学模型,为设计滴水计时器提供了理论参考模型。指出该滴水计时器可以应用于环境稳定、时间精度要求不高的家庭冰箱内,无需电池、环保绿色,有较大的应用价值。 展开更多
关键词 计量仪器 时间计量 滴水计时 水滴重量 细管流量 流量系数
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Capillary blood flow in patients with dysmenorrhea treated with acupuncture 被引量:7
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作者 Tao Huang Lijian Yang +5 位作者 Shuyong Jia Xiang Mu Mozheng Wu Hang Ye Weizhe Liu Xinnong Cheng 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2013年第6期757-760,共4页
OBJECTIVE: To observe capillary blood flow at acupoints during acupuncture treatment of primary dysmenorrhea and gain new insights into its analgesic mechanism. METHODS: Patients with primary dysmenorrhea were enrolle... OBJECTIVE: To observe capillary blood flow at acupoints during acupuncture treatment of primary dysmenorrhea and gain new insights into its analgesic mechanism. METHODS: Patients with primary dysmenorrhea were enrolled and randomly assigned to a treatment or control group. Subjects' symptoms were differentiated into variousTraditional Chinese Medicine(TCM) syndromes and treated for 10 sessions with puncturing acupuncture or self-pressing right-hand Hegu(LI 4), adding other acupoints based on syndrome. Laser speckle was used to compare the change in the vasomotor amplitude and perfusion of the capillaries in Hegu(LI 4) before and during the treatment. Each subject was required to finish the period pain symptoms observation form, verbal rating scales, numerical rating scale, pain rating index, face rating scale, Zung self-rating depression scale, Zung self-rating anxiety scale, and numerical rating scale before and after treatments. RESULTS: After 10 sessions, the symptom scores, pain index(PI), and visual analog scale(VAS) decreased significantly in treatment group. The volume of blood flow in Hegu(LI 4) declined slightly. No significant evidence supported that needling caused capillary contraction, but the capillary vasomotor amplitude at Hegu(LI 4) increased remarkably. CONCLUSION: Acupuncture can increase the capillary blood flow, thus promoting the flow of Qi and blood in terms of TCM theory, which facilitates pain relief. 展开更多
关键词 CAPILLARIES PERFUSION Acupuncturetherapy Arrival of Qi Point LI 4 (Hegu) Dysmenor-rhea Manifest anxiety scale Laser speckle bloodflow scanning Vasomotor amplitude
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Comparison of the Effects of Traditional Box-Moxibustion and Eletrothermal Bian-Stone Moxibustion on Volume of Blood Flow in the Skin 被引量:8
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作者 黄涛 王瑞红 +7 位作者 黄鑫 田玉英 张维波 Hossein Ayali 王广军 张宇沁 Genhard Litscher 王璐 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2011年第1期44-45,共2页
Objective: To investigate and compare the effects of Electrothermal Bian-stone moxibustion and traditional box-moxibustion on capillary blood perfusion in the body surface. Methods: Twenty healthy subjects, 18 females... Objective: To investigate and compare the effects of Electrothermal Bian-stone moxibustion and traditional box-moxibustion on capillary blood perfusion in the body surface. Methods: Twenty healthy subjects, 18 females and 2 males, aged averagely 36 years, were enrolled in this experiment. The traditional box-moxibustion and electrothermal Bian-stone moxibustion were respectively given on the hypogastrium around Guanyuan (CV 4), and the changes of local capillary blood perfusion in the body surface were investigated with Laser Doppler Perfusion Imaging (LDPI). Results:The traditional box-moxibustion was superior to the electrothermal Bian-stone moxibustion in the transient increasing effect in whole body and the long-term increasing effect in the local area of moxibustion on capillary blood perfusion; but for both methods, the increasing effect on the capillary blood perfusion in the local area of moxibustion was same. Conclusion: Electrothermal Bian-stone moxibustion can not completely take the place of the traditional box-moxibustion; but for some disorders with local pain, they possibly have the same effects. 展开更多
关键词 box-moxibustion electrothermal Bian-stone moxibustion LDPI Guanyuan (CV4) dysmenorrhea
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