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1.
Due to the advancement of low power miniature electronic devices, there is growing interest of physiological data sensing and recording using wireless body sensor networks. The paper presents the design of a portable physiological data logger that includes rechargeable battery, wireless radio frequency and Bluetooth connectivity, and graphical display with touch screen capability. The target application is video capsule endoscopy. Image data are logged in micro SD cards which can be easily transferred to PC or Smartphone using SD card reader, USB interface or Bluetooth wireless link. The hardware design is general and can be used in various medical or industrial applications by changing only the firmware of the microcontroller. The design is prototyped in 109 × 107 × 20 mm printed circuit board (PCB). Tests with animal tissues have been conducted to demonstrate the performance advantages of the data logger. A demonstration of wireless heart pulse monitoring and data logging is also presented. 相似文献
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通过高效液相色谱法(HPLC),建立一种检测关节疏通胶囊中的主要香豆素类成分即白蜡树精苷含量检测的方法.采用线性关系、精密度试验、8h稳定性试验、重现性实验、加样回收率试验等方法对关节疏通胶囊中的白蜡树精苷的含量检测方法进行开发,测定白蜡树精苷在0.5196~2.5980μg(r=0.9999)范围内呈现良好的线性关系,其中精密度试验、8h稳定性试验、重现性实验、加样回收率试验的RSD值均小于2%,加样回收率试验中,平均加样回收率为98.1%.对关节疏通胶囊中的主要成分白蜡树精苷进行了定量分析,选择334nm波长进行检测,减少了杂质的干扰.结果表明此法线性关系好、精密度高、准确性和重现性好、前处理相对简单,适合关节疏通胶囊中白蜡树精苷的含量检测. 相似文献
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目的建立HPLC测定安尔眠胶囊中丹酚酸B含量的方法。方法色谱柱为Diamonsil C18(150 mm×4.6 mm,5μm);流动相为乙腈-1%甲酸溶液(23:77);流速1.0 mL/min;检测波长286 nm。结果丹酚酸B在0.84~16.8μg范围内呈现较好的线性关系,回归方程为Y=7.5206X+0.3143(r=0.9998);回收率97.99%,RSD=2.16%。结论此方法简便快捷、结果准确可靠、重现性好,可以较好地控制安尔眠胶囊的质量。 相似文献
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Anna-Maria GabudeanFrederic Lerouge Thibault GallavardinMonica Iosin Soraya ZaibaOlivier Maury Patrice L. Baldeck Chantal AndraudStephane Parola 《Optical Materials》2011,33(9):1377-1381
Gold nanomaterials are promising objects for applications in optics and medicine because of their unique properties related to the Surface Plasmon Resonances (SPR) phenomena. It is possible to tune these properties with the control of the size and shape of the nanomaterials. Gold hollow spheres nanomaterials are an interesting concept for encapsulation of either dyes or drugs. The study of their properties and their behavior in a bio-environment still remains scarce and some phenomena are still to be explained in particular regarding local field enhancement effect or quenching of their photophysical properties. In this work we describe a process allowing inclusion of optical dyes in gold nanoshells and evaluate the optical properties. 相似文献
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C. van den Berg C.P.M. Roelands P. Bussmann E.L.V. Goetheer D. Verdoes L.A.M. van der Wielen 《Reactive and Functional Polymers》2009,69(10):766-770
Since the concept of solvent impregnated resins was introduced in the early 1980s, the technique has been applied to a limited amount of applications. The main disadvantage of the resins was that the amount of solvent inside was limited to approximately 1.5 ml/g polymer. A new generation of solvent impregnated resins is introduced. These capsules can contain up to 11.8 ml solvent/g polymer and were prepared using a modified dry impregnation technique. Due to the high solvent loading, the capacity per volume of capsule for extracting products from aqueous phases is therefore dramatically increased. 相似文献
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《Signal Processing: Image Communication》2014,29(3):345-360
In this paper, we present the design of a low power and hardware efficient image compressor integrated circuit for wireless capsule endoscopy application. The proposed compression algorithm supports dual-band imaging, that is, works on both white-band imaging (WBI) and narrow-band imaging (NBI). The scheme uses a novel color-space and simple predictive coding for optimized performance. Based on the nature of the narrow- and white-band endoscopic images and video sequences, several sub-sampling schemes are introduced. The proposed dual-band compressor is designed in such as way that it can easily be interfaced with any commercial low power image sensor that outputs RGB image pixels in a raster scan fashion, eliminating the need of large buffer memory and temporary storage. Both NBI and WBI reconstructed images have been verified by medical doctors for acceptability. Compared to other designs targeted to video capsule endoscopy, the proposed algorithm performs strongly with a compression ratio of 80.4% (for WBI) and 79.2% (for NBI), and a high reconstruction peak-signal-to-noise-ratio (over 43.7 dB for both bands). The results of the fabricated chip are also presented. 相似文献
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