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初中生感戴现状调查 被引量:2
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作者 聂丽萍 《山东省团校学报(青少年研究)》 2012年第2期37-39,共3页
作为积极心理学研究的一个重要领域,感戴研究日益受到学者关注。本研究采用初中生感戴问卷随机抽取了220名初中学生对其感戴现状进行测查。结果表明:初中生的感戴总分相对较高;男生的感戴水平显著低于女生;初一学生的感恩水平显著低于... 作为积极心理学研究的一个重要领域,感戴研究日益受到学者关注。本研究采用初中生感戴问卷随机抽取了220名初中学生对其感戴现状进行测查。结果表明:初中生的感戴总分相对较高;男生的感戴水平显著低于女生;初一学生的感恩水平显著低于初二学生。 展开更多
关键词 初中生 “感戴” 性别 年级
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Ultrasensitive stretchable patches for joint motion monitoring
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作者 LI Tengteng LI Ziwei +8 位作者 HAO Yafeng WU Huijia ZHU Pu MA Fupeng LI Fengchao YU Jiangang LIU Meihong LEI Cheng LIANG Ting 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2024年第3期285-291,共7页
Wearable devices have great application potential in the next generation of smart portable electronics,especially in the fields of medical monitoring,soft robotics,artificial intelligence,and human-machine interfaces.... Wearable devices have great application potential in the next generation of smart portable electronics,especially in the fields of medical monitoring,soft robotics,artificial intelligence,and human-machine interfaces.Piezoelectric flexible strain sensors are key components of wearable devices.However,existing piezoelectric flexible strain sensors have certain limitations in weak signal monitoring due to their large modulus and low sensitivity.To solve this problem,the concept of Kirigami(paper-cutting)was introduced in this study to design the sensor structure.By comparing the Kirigami structures of different basic structures,the serpentine structure was determined as the basic configuration of the sensor.The serpentine structure not only provides excellent tensile properties,but also significantly improves the sensitivity of the sensor,which performs well in monitoring weak signals.On this basis,the adhesion properties of the flexible sensor were analyzed and tested,and the optimal ratio of the substrate was selected for preparation.In addition,a low-cost and rapid prototyping process for stretchable patches was established in this study.Using this technology,we prepared the sensor device and tested its performance.Finally,we successfully developed a flexible sensor with a sensitivity of 0.128 mV/μɛand verified its feasibility for wrist joint motion monitoring applications.This result opens up new avenues for the recovery care of tenosynovitis patients after surgery. 展开更多
关键词 flexible sensor piezoelectric film motion monitoring wearable sensor
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On-body propagation characterization based on FDTD method for 2.4/5.2/5.7 GHz wearable body sensor networks 被引量:1
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作者 鲍淑娣 沈连丰 张元亭 《Journal of Southeast University(English Edition)》 EI CAS 2007年第2期151-155,共5页
The on-body path loss and time delay of radio propagation in 2. 4/5.2/5.7 GHz wearable body sensor networks (W-BSN) are studied using Remcom XFDTD, a simulation tool based on the finite-difference time- domain metho... The on-body path loss and time delay of radio propagation in 2. 4/5.2/5.7 GHz wearable body sensor networks (W-BSN) are studied using Remcom XFDTD, a simulation tool based on the finite-difference time- domain method. The simulation is performed in the environment of free space with a simplified three- dimensional human body model. Results show that the path loss at a higher radio frequency is significantly smaller. Given that the transmitter and the receiver are located on the body trunk, the path loss relevant to the proposed minimum equivalent surface distance follows a log-fitting parametric model, and the path loss exponents are 4. 7, 4. 1 and 4. 0 at frequencies of 2. 4, 5.2, 5.7 GHz, respectively. On the other hand, the first- arrival delays are less than 2 ns at all receivers, and the maximum time delay spread is about 10 ns. As suggested by the maximum time delay spread, transmission rates of W-BSN must be less than 10^8 symbol/s to avoid intersymbol interference from multiple-path delay. 展开更多
关键词 channel model path loss time delay characteristics wearable body sensor network
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Trace Elements in Leccinum scabrum Mushrooms and Topsoils from K odzka Dale in Sudety Mountains, Poland 被引量:5
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作者 ZHANG Dan ZHANG Yu +6 位作者 MORAWSKA Ewa BIELAWSKI Leszek KRASINSKA Grazyna DREWNOWSKA Ma gorzata PANKAVEC Sviatlana SZYMANSKA Karolina FALANDYSZ Jerzy 《Journal of Mountain Science》 SCIE CSCD 2013年第4期621-627,共7页
In the current study, we determined concentrations and transfer rates of Ag, Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, P, Rb, Sr and Zn to Brown Birch Scaber Stalks (Leccinum scabrum) mushrooms emerged ... In the current study, we determined concentrations and transfer rates of Ag, Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, P, Rb, Sr and Zn to Brown Birch Scaber Stalks (Leccinum scabrum) mushrooms emerged in the area of Sudety Mountains (Sudetes) in Poland. Fruiting bodies and topsoil samples beneath L. scabrum were collected form the Ktodzka Dale. The trace elements were determined using validated method and inductively coupled plasma - atomic emission spectroscopy (ICP-AES) for final measurement. Mushrooms contained Ag, Cr, Hg, Co, Ni and Sr at 〈 1.0μg/g dry weight; Ba and Pb at -1.0μg/g dw; Cd at 〈 5μPg/g dw; Cu and Mn at 〉 10 μg/g dw; Al and Ca at -100μg/g dw; Fe, Na, Rb and Zn at lOO to 500μg/g dw, Mg at -1.000μg/g dw; P at -5,000 μg/g dw and K at -30,000 μg/g dw. Ca, Mn and Ni were nearly equally distributed between stipes and caps; stipes compared to caps were enriched in Ba, Na and Sr, while caps were enriched in Ag, Al, Cd, Co, Cr, Cu, Fe, K, P, Pb, Rb and Zn. The values of bioconcentration factor (BCF) varied highly depending on chemical element and were 〉1 for Ag, Cd, Cu, K, Mg, Na, P, Rb and Zn, while 〈1 for A1, Ba, Ca, Co, Cr, Fe, Mn, Ni, Pb and Sr. Topsoil showed elevated content of lead and mean concentration was 99 ± 32 μg/g dw, while cadmium was at 0.41 ± 0.15 and those two highly toxic to human elements occurred in edible caps of L. scabrum at 4.5 ± 2.2 and 2.9 ± 2.0 μg/g dw, respectively. 展开更多
关键词 FOOD FUNGI Metallic elements Soil SUDETES Wild food
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An integrated flexible multifunctional sensing system for simultaneous monitoring of environment signals 被引量:2
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作者 Haoran Chen Zheng Lou Guozhen Shen 《Science China Materials》 SCIE EI CSCD 2020年第12期2560-2569,共10页
With the rapid development of portable devices and internet of things,the requirement of system wearability and integration accelerates the investigation of flexible multifunctional sensors.In this study,we developed ... With the rapid development of portable devices and internet of things,the requirement of system wearability and integration accelerates the investigation of flexible multifunctional sensors.In this study,we developed an integrated flexible sensing system with four nanowire-based sensors and a Ni microwire-based temperature sensor.The four nanowirebased sensors are three kinds of photodetectors responding to lights with different wavelengths and a gas sensor.Due to the large surface volume ratio and considerable sub wavelength effect,all the nanowire-based sensors show good sensing response and excellent linear relationship between sensitivity and temperature.The as-fabricated flexible sensing system can simultaneously detect environmental parameters,including temperature change,light intensities from UV-Visible to near infrared regions,and harmful gas concentration.Our flexible multifunctional sensing system therefore opens up a new way for the emerging portable and wearable electronics. 展开更多
关键词 flexible device NANOWIRE multifunctional sensing system gas sensor PHOTODETECTOR
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An ultra-sensitive and wide measuring range pressure sensor with paper-based CNT film/interdigitated structure 被引量:6
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作者 Chao Wang Xiaojuan Hou +7 位作者 Min Cui Junbin Yu Xueming Fan Jichao Qian Jian He Wenping Geng Jiliang Mu Xiujian Chou 《Science China Materials》 SCIE EI CSCD 2020年第3期403-412,共10页
Flexible pressure sensors have attracted great attention due to their potential in the wearable devices market and in particular in human-machine interactive interfaces.Pressure sensors with high sensitivity,wide meas... Flexible pressure sensors have attracted great attention due to their potential in the wearable devices market and in particular in human-machine interactive interfaces.Pressure sensors with high sensitivity,wide measurement range,and low-cost are now highly desired for such practical applications.In the present investigation,an ultrasensitive pressure sensor with wide measurement range has been successfully fabricated.Carbon nanotubes(CNTs)(uniformly sprayed on the surface of paper)comprise the sensitivity material,while lithographed interdigital electrodes comprise the substrate.Due to the synergistic effects of CNT’s high specific surface area,paper’s porous structure,interdigital electrodes’efficient contact with CNT,our pressure sensor realizes a wide measurement range from 0 to 140 kPa and exhibits excellent stability through 15,000 cycles of testing.For the paper-based CNT film/interdigitated structure(PCI)pressure sensor,the connection area between the sensitive material and interdigital electrodes dominates in the lowpressure region,while internal change within the sensitive materials plays the leading role in the high-pressure region.Additionally,the PCI pressure sensor not only displays a high sensitivity of 2.72 kPa–1(up to 35 kPa)but also can detect low pressures,such as that exerted by a resting mung bean(about 8 Pa).When attached to the surface of a human body,the pressure sensor can monitor physiological signals,such as wrist movement,pulse beats,or movement of throat muscles.Furthermore,the pressure sensor array can identify the spatial pressure distribution,with promising applications in humanmachine interactive interfaces. 展开更多
关键词 carbon nanotube interdigital structure pressure sensors paper-based carbon nanotube(CNT)film ultrabroad measuring range
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