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Noncontact Monitoring of relative changes in Blood Pressure Using Microwave Radar Sensors

Journal of Biomedical Science and Engineering 2022年第1期15卷 51-65页

作者： Satoshi Suzuki Guanghao Sun Masaaki Hoshiga Kentaro Kotani Takafumi Asao Faculty of Engineering Science Kansai University Osaka Japan Graduate School of Informatics and Engineering The University of Electro-Communications Tokyo Japan Faculty of Medicine Osaka Medical College Osaka Japan

This study aims to confirm whether noncontact monitoring of relative changes in blood pressure can be estimated using microwave radar sensors. First, an equation to estimate blood pressure was derived, after which, the effectiveness of the estimation equation was confirmed using data obtained by a noncontact method while inducing variations in blood pressure. We considered that the Bramwell-Hill equation, which contains some parameters that directly indicate changes in blood pressure, would be an appropriate reference to construct an estimation equation for the noncontact method, because measurements using microwave radar sensors can measure minute scale motion on the skin surface induced by the pulsation of blood vessels. In order to estimate relative changes in blood pressure, we considered a simple equation including the pulse transit time (PTT), amplitude of signals and body dimensions as parameters. To verify the effectiveness of the equation for estimating changes in blood pressure, two experiments were conducted: a cycling task using an ergometer, which induces blood pressure fluctuations because of changes in cardiac output, and a task using the Valsalva maneuver, which induces blood pressure fluctuations because of changes in vascular resistance. The results obtained from the two experiments suggested that the proposed equation using microwave radar sensors can accurately estimate relative changes of blood pressure. In particular, relatively favorable results were obtained for the changes in blood pressure induced by the changes in cardiac volume. Although many issues remain, this method could be expected to contribute to the continuous evaluation of cardiac function while reducing the burden on patients.

关键词： Microwave Radar Noncontact Monitoring Blood Pressure relative change Continuous Monitor

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Apparent stress as an indicator of stress meta-instability:The 2021 M_(S)6.4 Yangbi earthquake in Yunnan,China

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Earthquake Science 2023年第6期36卷 433-444页

作者： Yan′e Li Xuezhong Chen Lijuan Chen Yaqiong Ren Xiangyun Guo Institute of Geophysics China Earthquake AdministrationBeijing 100081China Chongqing Earthquake Agency Chongqing 401147China

Investigating spatiotemporal changes in crustal stress associated with major earthquakes has implications for understanding seismogenic ***,in individual earthquake cases,the characteristics of the stress after it reaches its maximum value are rarely *** this study,we use the 2021 M_S6.4 Yangbi earthquake in Yunnan,China and events of magnitudes M_L≥3.0 occurred in the surrounding area in the previous 11 years to investigate the spatiotemporal evolution of apparent *** results indicate that apparent stress began to increase in January 2015 and reached a maximum in January *** stress then remained at a high level until October 2020,after which it declined *** suggest that the stress was in the accumulation stage from January 2015 to January 2020,and entered the meta-instability stage after October *** the meta-instability stage,the zone of decreasing stress expanded continuously and the apparent stress increased around the Yangbi earthquake source *** features are generally consistent with the results of laboratory rock stress *** propose that apparent stress can be a good indicator for determining whether the stress at a specific location has entered the meta-instability stage and may become the epicenter of an impending strong earthquake.

关键词： 2021 M_(S)6.4 Yangbi earthquake apparent stress relative change meta-instability

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Interactive effect of climate warming and nitrogen deposition may shift the dynamics of native and invasive species

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Journal of Plant Ecology 2021年第1期14卷 84-95页

作者： Guang-Qian Ren Chris B.Zou Ling-Yun Wan Jacob H.Johnson Jian Li Lan Zhu Shan-Shan Qi Zhi-Cong Dai Hai-Yan Zhang Dao-Lin Du Institute of Environment and Ecology Academy of Environmental Health and Ecological SecuritySchool of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013China Institute of Agricultural Engineering Jiangsu UniversityZhenjiang 212013China Department of Natural Resource Ecology and Management Oklahoma State UniversityStillwater 74078USA Guangxi Botanical Garden of Medicinal Plants Nanning 530023China Department of Statistics Oklahoma State UniversityStillwater 74078USA Changzhou Environmental Monitoring Center Changzhou 213000China

Aims Projections of invasive species expansion under a warmer world often do not explicitly consider the concurring nitrogen(N)*** remains largely unknown how the convoluted effect of climate warming and N deposition will shift the native and invasive species ***,we hypothesize that the concurring in creases in N and temperature would promote growth of invasive species greater than that of native *** A controlled greenhouse experiment was conducted to quantify the growth response of an invasive species(Solidago canadensis L.)and a co-existing native species(Artemisia argyi Levi,et Van)under the effects of climate warming,N deposition and their *** Findings Due to the strong positive effect of N addition,the interactive effect of temperature increase and N addition resulted in an overall significant increase in growth of both in vasive and native species,demonstrating that these manipulations may make microhabitats more favorable to plant ***,the relative increases in biomass,height and diameter of invasive *** were signifiesntly lower than those of native *** suggests that the vegetative growth superiority of invasive *** over the native species *** is reduced by the enhanced N availability in the warmer ***,the inclusion of N deposition may mitigate the projection of invasive species *** expansion under climate warming.

关键词： biological invasion climate warming N deposition relative change Solidago canadensis

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