Attachment of Salmonella typhimurium to Poultry Skin as Related to Cell Viability

³H-labeled S. typhimurium cells inactivated by gamma-radiation (⁶⁰Co) and by formaldehyde (5%) were used to determine if cell viability affected attachment to poultry skin. Both gamma-irradiated and formal-dehyde-treated cells attached like live cells. There was no difference in attachment between cells grown in a chemically defined medium (SCDM) or in brain heart infusion broth (BHI). Live and gamma-irradiated cells and BHI-grown and SCDM-grown cells had similar surface hydrophobicity. Live and gamma-irradiated cells had similar cell surface charges, whereas BHI and SCDM-grown cells had different surface charges. Differences in cell surface charge did not affect attachment rate.     

基于智能夹层的复合材料柔性蒙皮变形测量研究

探索变体机翼蒙皮拉伸变形测量的可行性,对波纹式复合材料蒙皮的变形测量方法进行研究。通过新配方制作了波纹式蒙皮试件,对其进行力学拉伸试验,分析蒙皮的力学性能。制作模块化的智能夹层,对安装在蒙皮上的智能夹层输出特性进行测试,并与直接粘贴在蒙皮表面的应变片输出特性进行对比分析。结果表明:通过新配方制作的柔性蒙皮线弹性范围达到0~7%;在蒙皮线弹性范围内智能夹层能有效测得应变数据,其应变灵敏系数相对于应变片由2.08降至1.84;由应变反推的蒙皮伸长量与实际伸长量较吻合。     

皮肤阻抗检测系统隔离刺激器的设计与实现

隔离刺激器是皮肤阻抗检测系统中重要的组成部分,根据检测系统的具体要求,提出一种新型的刺激器设计方案。该方案采用LM317HV调整刺激器信号的电压输出幅度,最高可达80 V;通过HV632调整输出脉冲的宽度和周期,从而实现一个幅度、脉宽和周期均可调的高压脉冲发生器。该刺激器具有操作简便、性能稳定、精度高和脉冲波形好等优点,可广泛应用于需要高压可调脉冲的场合,亦可对其进行扩展,满足具体的工程需求。     

Design of MCI single and symmetrical on-chip spiral inductors

In this paper, the MCI (multipath crossover interconnection) technique for octagon single and symmetrical spiral inductors has been presented to improve the quality factor. The metal wires of the single and symmetrical inductors formed by the top metal are divided into multiple segments according to the depth of the skin effects. The outermost path of the metal is crossover-interconnected to the innermost path by the underlayer metal and via The crossover technique makes the lengths of the total current paths between two ports approximately equal to each other. Therefore, the induced magnetic flux and resistance of each path can be balanced and the Q-factor of spiral inductors can be enhanced. The proposed MCI technique has been validated by the electromagnetic simulation with the 130-nm 1P6M SiGe BiCMOS process. For the devices with occupying areas of 240×240μm², results of electromagnetic simulation show that about 24% improvement in the Q-peak (3.3 GHz) of the MCI single inductor as compared to conventional single inductors (3.1 GHz), and about 88.1% improvement in the Q-peak (3.2 GHz) of the MCI symmetrical inductor as compared to conventional symmetrical inductors (1.8 GHz).     

基于运动变化的指势行为实时判别方法

提出了一种基于运动变化的实时指势判别方法。根据指势行为特征,跟踪手臂运动区域的运动状态,计算指势视频中每个独立运动序列的连续运动方向,统计其在一定方向范围内的累积运动帧数,当该运动序列在确定方向范围内的累积运动帧数达到预定范围时,根据指势手臂在指向目标时存在片刻停顿,从复杂场景中实时判别指势。实验结果表明,该方法简单、有效。     

应用于显示器件的动态肤色校正方法

基于输入图像中需要调整的肤色区域动态地移向特征肤色区域的图像动态肤色校正方法,提出了一种适用于显示器件中硬件实现的动态肤色校正简化模型,进而设计实现了实时动态肤色校正电路,并将其应用于100 cm彩色交流等离子体显示器(AC PDP)中进行验证。仿真及实验结果表明,本文提出的实时动态肤色校正方法能够使得校正后的输出图像中皮肤颜色显得更加自然生动,更趋近于人们对肤色的先验理解,从而有效地提高了AC PDP的彩色再现能力。     

大型雕塑三维透视纠正系统的研究和开发

由于人眼透视非线性的事实,在对雕塑手稿进行等比例放大后均需根据所观察到的透视效果对大型雕塑进行透视纠正。原来雕塑家需对照手稿人工制作透视正确的放大雕塑,由于大型雕塑体积大,手工制作工作量大,为了减少工作量,文中研究并开发了一种雕塑透视纠正系统。在该系统中,首先读入雕塑手稿的三维扫描模型数据,为雕塑设计者可使用计算机对雕塑模型数据在虚拟环境下进行放大模拟和透视纠正,随后通过将计算机生成的模型分割后进行机械加工得到大型雕塑,从而减少了真实雕塑纠正和放大所耗费的时间。     

Cephalopod-Inspired Stretchable Self-Morphing Skin Via Embedded Printing and Twisted Spiral Artificial Muscles

Cutaneous muscles drive the texture-modulation behavior of cephalopods by protruding several millimeters out of the skin. Inspired by cephalopods, a self-morphing, stretchable smart skin containing embedded-printed electrodes and actuated by Twisted Spiral Artificial Muscles (TSAMs) is proposed. Electrothermally actuated TSAMs are manufactured from inexpensive polymer fibers to mimic the papillae muscles of cephalopods. These spirals can produce strains of nearly 2000% using a voltage of only 0.02 V mm⁻¹. Stretchable and low-resistance liquid metal electrodes are embedded-printed inside the self-morphing skin to facilitate the electrothermal actuation of TSAMs. Theoretical and numerical models are proposed to describe the embedded printing of low-viscosity Newtonian liquid metals as conductive electrodes in a soft elastomeric substrate. Experimental mechanical tests are performed to demonstrate the robustness and electrical stability of the electrodes. Two smart skin prototypes are fabricated to highlight the capabilities of the proposed self-morphing system, including a texture-modulating wearable soft glove and a waterproof skin that emulates the texture-modulation behavior of octopi underwater. The proposed self-morphing stretchable smart skin can find use in a wide range of applications, such as refreshable Braille displays, haptic feedback devices, turbulence tripping, and antifouling devices for underwater vehicles.     

The effects of topical l(+) lactic Acid and ascorbic Acid on skin whitening

Subjects with medium to dark skin and many exhibiting facial age spots or discolorations participated in this twelve week study to evaluate the skin whitening ability of lactic and ascorbic acid. Using clinical and biophysical test methods we observed prolonged treatment with 8.8% L(+) lactic acid resulted in no significant effects on skin pigmentation. However treatment with L(+) lactic acid supplemented with ascorbic acid (1%) did produce a whitening effect which becomes apparent after three months. These effects were demonstrated clinically by the test panelists, and trained clinicians, and with objective instrumental methods. We observed a general skin lightening and did see a modest preferential lightening of age spots with the combination of acids.