共查询到20条相似文献,搜索用时 156 毫秒
1.
血糖浓度检测对于糖尿病、肝肾疾病以及手术后患者状况监测有着重要意义.随着检测技术的不断发展与提高,无创伤性血糖检测颇受关注,光学的无创血糖检测展现出巨大的发展潜力.对有创和无创检测方法进行阐述,重点对主流光学无创血糖检测方法进行了研究,对其检测原理、优势与存在问题进行了分析,最后总结出无创血糖光学检测方法技术特点以及适... 相似文献
2.
3.
用线性扫描伏安法、交流阻抗和恒电流放电等方法,研究了在4
mol/L KOH溶液中,微量HgCl2对4种铝阳极(铝含量分别为99.999%、99.990%、99.820%和99.500%)电化学行为的影响.当HgCl2浓度为0.05
mmol/L时,铝阳极(99.999%、99.990%和99.820%)具有较好的电化学性能;当HgCl2浓度为0.15
mmol/L时,铝(99.500%)的活化和缓蚀性能改善最大,其阳极溶解电流密度高达164.4
mA/cm2. 相似文献
4.
微量HgCl2对铝阳极电化学行为的影响 总被引:2,自引:0,他引:2
用线性扫描伏安法、交流阻抗和恒电流放电等方法,研究了在4 mol/L KOH溶液中,微量HgCl2对4种铝阳极(铝含量分别为99.999%、99.990%、99.820%和99.500%)电化学行为的影响.当HgCl2浓度为0.05 mmol/L时,铝阳极(99.999%、99.990%和99.820%)具有较好的电化学性能;当HgCl2浓度为0.15 mmol/L时,铝(99.500%)的活化和缓蚀性能改善最大,其阳极溶解电流密度高达164.4 mA/cm2. 相似文献
5.
铝在碱性胶体电解质中的阳极行为 总被引:2,自引:2,他引:0
用电化学测试法分别考察了"羧甲基纤维素钠(CMC) 4 mol/L KOH"和"聚丙烯酸(PAA) 4 mol/L KOH"胶体电解质对铝阳极的电化学性能影响.结果表明:铝在2.5%PAA胶体电解质中的电化学性能比在CMC胶体电解质中的好;在2.5%PAA胶体电解质中分别添加0.50 mmol/L Na2SnO3、0.05 mmol/L HgCl2和0.80 mmol/L K2MnO4,对铝的缓蚀、活化作用都有所改善.效果最好的是Na2SnO3,K2MnO4次之. 相似文献
6.
7.
测定凝结水痕量阴离子的色谱法 总被引:2,自引:0,他引:2
介绍了可用于测定水中痕量阴离子的色谱法,以自制新型分离柱,用5.3mmol/L的Na2CO3溶液为淋洗液,在1.5mL/min的流速下,成功地同时测定了火电厂凝结水中的痕量氯离子和硫酸根。氯离子的测定范围为1~20μg/L,回收率为98%~105%,相对标准偏差为0.77%,检出下限可达0.8μg/L;硫酸根的测定范围为15~50μg/L,回收率为97%~104%,相对标准偏差为0.91%,检测下限可达1.0μg/L。该离子色谱法已能满足测定火电厂凝结水中痕量氯离子和硫酸根离子的要求。 相似文献
8.
针对急性高原反应,研发了相关的人体高原适应性多参数同步监测系统。通过无创的方法来监测人体在高海拔环境下相关生理参数(血氧饱和度、心率、心电、脉搏波、呼吸)的变化,同时监测人体所处外界环境参数(海拔、气压、温度、方向、GPS定位)。通过基于无创多参数同步测量系统之上的高原适应性分析算法,对多种参数综合分析,给出人体在高海拔下的高原适应状况的直观判断,通过通讯模块实现数据远距离无线传输。 相似文献
9.
10.
本文是在试验室试验基础上对二年多工业试验的总结.采用H_2SO_4—ATMP复合处理,在补充水水质的全碱度为4.8~5.6mmol/L.全硬度为4.0~5.5mmol/L.Cl~- 为46~52mg/L时,浓缩倍率可达2.5~3.0,防止了凝汽器铜管结垢,并基本上防止了水塔结垢,节约了用水量,取得了良好的综合经济效益. 相似文献
11.
目前临床使用的脑血氧无创监测设备大多为双波长,由于黑色素的吸收会导致测量结果出现偏差,因此需要对测量结果进行修正。为此本文基于近红外光谱无创监测脑血氧的基本原理,针对现有脑血氧无创监测设备的不足,考虑前额叶的光学特性,研制了一种四波长探测光源(700、760、805、850 nm)以及双路光电检测器的脑血氧无创监测传感装置,并建立了光谱吸光度的数学模型,在此基础上构建了新型的脑血氧无创监测系统,实现了可抑制皮肤黑色素成分干扰的脑血氧信息无创测量。最后通过对Valsalva运动以及空载的对照实验进行秩和分析,初步验证了本系统的有效性。 相似文献
12.
Talary M.S. Dewarrat F. Caduff A. Puzenko A. Ryabov Y. Feldman Y. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2006,13(2):247-256
There is a requirement for the development of non-invasive continuous blood glucose monitoring devices to meet the clinical demands of the rapidly increasing number of people currently developing diabetes mellitus. Impedance spectroscopy is a technology that meets the requirements of such devices. An NI CGMD is being developed as a device that couples a sensor to the skin to form an RCL sensor. The reliability of such an RCL sensor model has been investigated by comparing electrodynamical simulations to in-vitro measurements of dielectrically "lossy" materials. The sensor has been modeled and simulated in FEMLAB (finite element modeling laboratory). In-vitro measurements are performed on hydrogels, representing the lossy material, by the aid of a Rohde & Schwarz VNA (vector network analyzer). From the quantitative agreement of the results we conclude, that the proposed qualitative model is appropriate for the characterization of the RCL sensor and suggests that more detailed models can be used to elucidate the behavior of human skin tissue. 相似文献
13.
Maruo K. Tsurugi M. Chin J. Ota T. Arimoto H. Yamada Y. Tamura M. Ishii M. Ozaki Y. 《IEEE journal of selected topics in quantum electronics》2003,9(2):322-330
This paper reports in vivo near-infrared (NIR) noninvasive blood glucose assay using dermis tissue spectra. We assume that the glucose content in dermis tissue traces the variations in blood glucose. For dermis spectra measurements, epidermis, especially stratum corneum, acts as an interference in skin tissue. Thus, we have developed a method for the selective measurement of dermis tissue spectra, enabling us to obtain better quality spectra for an accurate blood glucose assay. The selective measurement of the dermis spectra realized by using a newly developed fiber-optic probe that consists of source and detector optical fibers separated by 0.65 mm on a skin surface. The light path in the skin tissue for this geometry has been simulated by a Monte Carlo method. The simulation results show that detected light mainly interrogates dermis tissue. As the absorbance signal of glucose in human tissue is extremely small, the quality of the measured spectra is critical for the reliable assay. The present method for blood glucose assay has been applied to one Type 1 diabetic. The correlation coefficient between the blood glucose content predicted by NIR spectra and those measured by finger-prick was 0.928 and the standard error of prediction was 32.2 mg/dL. These results demonstrate the potential of our methodology for noninvasive NIR blood glucose assay. 相似文献
14.
Noninvasively measuring blood glucose using saliva 总被引:2,自引:0,他引:2
Yamaguchi M. Mitsumori M. Kano Y. 《IEEE engineering in medicine and biology magazine》1998,17(3):59-63
Self-measurement of blood glucose level is a very important aspect in monitoring the health quality of diabetic patients who require insulin therapy. Typically, a blood sample for analysis is obtained via a finger stick or other such invasive procedure. Often, this blood collecting causes physical and mental stress to the patient. For this reason, it is desirable to establish a noninvasive bloodless procedure to monitor the blood glucose level (BGL). Here, the authors discuss the correlation between BGL and saliva glucose level and then present an approach that uses an enzyme-sensor system to noninvasively measure blood glucose using saliva 相似文献
15.
Object
Knowledge of the total circulating blood volume (TCBV) is essential for the treatment of a variety of medical conditions and blood disorders. To date, blood volume analysis is rarely carried out due to the disadvantages of available methods. Our aim was to develop a widely available, simple, fast, yet accurate method for the determination of the total circulating blood volume.Materials and methods
Magnetic resonance (MR) is a well-established, non-invasive technique. In this article, we present a method that uses MR contrast agents for the determination of the blood volume. The dependence of MR relaxation times on the concentration of MR contrast agents allows the calculation of the volume the contrast agent has been diluted in.Results
In phantom and in vivo experiments we could demonstrate that TCBV can be determined with high accuracy and precision.Conclusion
This work introduces a novel method for the determination of the total circulating blood volume using magnetic resonance contrast agents as tracers. 相似文献16.
Parker R.S. Doyle F.J. III Peppas N.A. 《IEEE engineering in medicine and biology magazine》2001,20(1):65-73
This article discusses closed-loop blood glucose regulation algorithms that use the intravenous route for insulin delivery to insulin-dependent diabetic patients. Classical control methods and advanced algorithms using implicit knowledge or explicit models (empirical, fundamental, or “gray-box”) of the diabetic patient are examined. Current research on characterizing patient variability is presented, in the context of a model predictive controller able to adjust to changes in patient glucose and insulin sensitivity 相似文献
17.
18.
脉搏波所呈现出的形态、强度、速率和节律等方面的综合信息,反映了人体心血管系统的众多生理病理信息.现代医学通过脉搏波获取心血管动力学参数,我国传统医学通过脉搏诊断人体各个器官、经络的健康状况.本系统采用科学的手法采集并分析脉搏波,光电容积脉搏波描述法因其无创、便宜、方便等优点,在评估血液动力学参数方面应用较多.尤其是用于血氧饱和度、血压以及心输出量的测量.本系统在光电容积描述法采集脉搏波信号后利用专业算法,提取心血管动力学参数的同时结合传统医学分析人体12经络健康状况,最后将历史数据保存并通过TCP远程共享. 相似文献
19.
提出了环境意识设计与绿色电器的概念.描述了环境意识设计的内涵,将环境因素引入产品设计的总体原则及开发过程模式,并以环境意识设计工具进行电器产品生态设计开发,制造绿色电器.环境意识设计资源消耗低、环境影响小,对我国可持续发展有着重要意义. 相似文献