Planar antenna with diffraction radiation for radar complex of millimeter band

Design principles of diffraction-type planar antennas which can be successfully used for building antennas systems with required parameters including formation of radiation pattern (RP) with special shape are presented. All main characteristics of the studied planar antenna with open electro-dynamic structure of millimeter band on the example of antenna system used in the modern radar complex are obtained.     

A bulk semiconductor imaging device for millimeter and submillimeter radiation

A device is described whereby millimeter or submillimeter wave images obtained from reflecting targets can be converted to visible displays providing a cathode ray tube presentation. The principle of the technique is based on the fact that transmitted power at these wavelengths can be modulated by a semiconductor panel in which the bulk conductivity is changed by electronic means. Experimental data is reported.     

I-R and millimeter wave radiation at the national synchrotron light source

We describe two experimental arrangements which utilize synchrotron radiation in the near/middle infrared and the far infrared to the millimeter region.     

毫米波MIMO天线电磁辐射上限分析研究

第五代移动通信技术采用毫米波多输入多输出天线为高质量无线通信提供技术支撑,对传统的辐射安全性评估带来新的挑战。提出了采用无监督深度学习方法,分析毫米波MIMO设备电磁辐射上限,进而实现对MIMO设备辐射安全性的评估。首先从理论上分析了利用无监督学习方法分析MIMO设备电磁辐射上限的可行性,并以工作频率28 GHz的不同天线阵列为例,验证所提方法的可行性。此外,利用蒙特卡洛法作为参照对比验证了所提算法的可靠性。结果表明,所提方法与蒙特卡洛法的功率密度分布最大值和均值的误差均可控制在0.07%以下,可以准确高效地分析毫米波MIMO设备辐射上限,为快速评估毫米波MIMO设备的辐射安全性提供了新的方案。     

用于毫米波辐射非致命生物效应的94 GHz回旋管设计与实验

设计和测试了内嵌准光系统的94 GH z回旋管,该系统主要用于研究毫米波辐射的非致命生物效应。为了减少大功率高频下的回旋管壁面加热问题,选择TE+6,2模式作为工作模式。对于高阶模式,存在更多相邻模式,因此模式竞争会影响实验的稳定性和有效的可操作性。渐变腔已被设计为抑制单个腔中的模式竞争。另外,具有低衍射准光模式变换器的功率转换效率为98.54%。实验结果表明,回旋管输出功率为50.9 kW,效率为34.3%。对于非致死的生物效应研究,整体设计方案达到了预期的效果。     

The influence of fiber dispersion on the transmission performance of a quadruple-frequency optical millimeter wave with two signal modulation formats

This paper reports investigations of the transmission performance of a 40 GHz dual-tone optical millimeter (mm) wave by quadrupling a radio-frequency local oscillator via a single dual-electrode Mach–Zehnder modulator based on the transmission function of the dispersive fiber. The theoretical analysis and simulation results show that, although the fiber chromatic dispersion does not cause a fading effect on the optical mm wave with the two signal modulation formats, the bit walk effect caused by the time shift of the sidebands due to fiber dispersion limits its transmission distance as the signal is modulated on the two tones. The limitation of transmission distance caused by the bit-walk effect can be overcome if the signal is modulated on only one of its two tones, and, in this way, the transmission distance is greatly extended. Moreover, the dual-tone data modulation format is more suitable for a radio-over-fiber link with transmission distance less than 40 km owing to the good signal performance and ease of implementation, while single-tone data modulation can be applied for a longer fiber link, even up to 120 km.     

Numerical model of heat transfer in the rabbit eye exposed to 60-GHz millimeter wave radiation

A numerical model of the anterior chamber of the rabbit eye is presented. The model takes into account both the fluid dynamics of the aqueous humor and the realistic boundary conditions at the interface of the cornea with the environment. The model is used to determine the temperature distribution and velocity field under 60-GHz millimeter wave radiation. The maximum predicted temperature (45.8 (°) C for an incident power density of 475 mW/cm(2)) is in good agreement with experimental results. Moreover, the model shows that there is a value for the incident power density (about 100 mW/cm(2)) for which the direction of aqueous humor flow due to buoyancy is inverted, because of the inversion of the temperature gradient in the anterior chamber of the eye. This phenomenon has already been reported from experimental observations and can be numerically studied, if aqueous humor fluid dynamics are taken into account in the heat-transfer model.     

A cooperative metabolic syndrome estimation with high precision sensing unit

In this letter, we discuss a sensor-integrated system model for metabolic syndrome prediction with workflow system. This model measures not only a cell temperature variation using invasive method but also controlling simulation for metabolic syndrome prediction. To identify the system realization, we discuss the schemes for predicting metabolic syndrome from measurement of mitochondrial activity by using high precision sensors and integrated simulation model of human energetic under high performance workflow computing environment. To predict metabolic syndrome, we built a sensor-integrated chamber that had network interface to deliver analysis results of human cells, annotation data from public hospital, and metabolic data. Using the proposed system, we showed the possibility to evaluate the functionality of human mitochondria and analyze energy metabolism.     

高频辐射对数字功率电表计量的影响

高频辐射对数字功率电表计量影响是指窃电分子利用高频辐射发生器发射高频电磁信号,干扰数字功率电表的内部工作流程,破坏电表的工作曲线,造成电表不计或少计电量。该种窃电方式具有极强的隐蔽性,极大地扰乱了供用电秩序,造成了巨大的经济损失。同时也使得反窃电稽查工作更加困难,必须引起高度重视。现对高频辐射对数字功率电表计量的干扰原理及其鉴定措施进行浅析,以供广大同行进行参考。     

红外辐射大气透过率影响因素的研究

大气传输是红外测温过程中不可忽视的一个重要问题。研究大气传输最主要的是计算大气透过率。在MODTRAN软件基础上,分析了8~12 μm波段多种关键因素对红外传输大气透过率的影响,研究了其变化规律。结果表明初始高度、边界层气溶胶、路径长度、波数间隔等对大气透过率都有一定的影响。其中路径长度对大气透过率的影响相对明显。通过外场测温实验,进一步研究路径长度对测温精度的影响,得出实际测温过程中的衰减率。比较分析仿真得到的大气透过率与实验测得的大气透过率二者之间的关系,拟合出二者的关系曲线。     

老年男性阻塞性睡眠呼吸暂停程度与代谢综合征的相关性研究

目的：研究老年男性阻塞性睡眠呼吸暂停综合征（obstructive sleep apnea syndrome ,OSAS）严重程度与代谢综合征的相关性。方法：随机选择我院收治的663例老年患者,根据呼吸暂停及低通气指数,将其分为非OSAS 组和轻、中、重度OSAS 组。比较各组患者颈围、体质指数（BMI）、腰臀比、血压、血脂、空腹血糖等,分析OSAS严重程度与代谢综合征及其组分发病率之间的相关性。结果 OSAS患者的颈围、BMI、腰臀比、收缩压、舒张压、空腹血糖等显著高于非OSAS组患者。OSAS严重程度与颈围、BMI、甘油三酯等存在显著正相关,且随着OSAS严重程度的增加,代谢综合征及其组分的发生率呈逐渐递增趋势。结论：老年男性阻塞性睡眠呼吸暂停程度与代谢综合征发病率密切相关,这可能是阻塞性睡眠呼吸暂停综合征增加心血管疾病发生率和死亡率的主要原因。     

Truncation in millimeter and submillimeter-wave optical systems

The authors present a technique for determining the power that is lost when the field in a beam waveguide is truncated by an axially-symmetric stop. The technique is based on the principles of multimode Gaussian optics. Although the underlying theory is applicable to any long-focal-length optical system, they concentrate on beam waveguides that are fed by diagonal horns, corrugated horns, smooth-walled conical horns, and uniformly-illuminated apertures. The results are summarized in a series of plots which show truncation loss as a function of normalised aperture size and phase slippage. These plots can be used together with single-mode design techniques to minimize the size of millimeter and submillimeter-wave optical systems     

毫米波与静电复合定向探测与目标识别技术

为实现高精确度的脱靶方位探测,分析了静电探测矢量测角算法原理并推导出探测方程。提出了毫米波与静电复合探测目标识别方法和起爆控制方法,通过试验验证了毫米波与静电复合定向探测技术的可行性。试验结果表明毫米波与静电复合探测技术具有良好的定位精确度和较强的抗干扰性能,可满足定向引战系统的高精确度起爆控制要求。     

基于视觉和毫米波雷达的车辆检测

根据智能车辆主动驾驶辅助系统中的重要性,提出了一种融合毫米波雷达数据和视觉多特征的车辆检测算法。车辆检测算法通过三个步骤实现,首先,提出一种空间对准算法实现毫米波雷达和视觉的空间对准;其次,根据空间对准结果和搜索策略提取目标车辆的感兴趣区域;最后,融合车底阴影、对称轴、左右边缘等车辆特征实现车辆检测,其中,为了准确得到目标车辆的车底阴影,提出一种改进的车底阴影分割算法。算法的性能在不同的场景下得到证实,实验结果表明该车辆检测算法是有效和可靠的。     

5G毫米波短距离链路雨衰减特性分析

雨衰减严重影响第5代(the 5th Generation,5G)移动通信系统性能.在路径长度小于1 km的短距离链路情况下,现有雨衰减预测模型调整因子大于1,导致预测雨衰减随路径变短而增大,无法支撑毫米波短距离链路系统设计.通过分析国际电信联盟无线电通信部(Radiocommunication Sector of International Telecommunication Union,ITU-R)短距离链路雨衰减试验数据,发现湿天线衰减与路径雨衰减相当,得到毫米波短距离链路必须考虑湿天线衰减的结论.建立了湿天线衰减与降雨率的关系模型,分频段对模型参数进行了拟合,拟合结果与实测数据吻合得较好.提出了考虑湿天线衰减的短距离雨衰减建模新思路,可解决短距离雨衰减预测问题.研究结果有助于提高5G毫米波系统余量设计的可靠性.     

C-T型平板波导红外光谱仪系统自身背景辐射的分析与抑制

红外光谱仪内部背景辐射在长波红外波段（8~12 m）影响比较显著,会严重降低光学系统的分辨率和信噪比。利用TracePro光学分析软件,对基于交叉非对称Czerny-Turner （C-T）型平板波导红外光谱仪进行了背景辐射分析,包括机械构件表面发射率以及光学元件表面温度对背景辐射的影响。引入了杂光系数作为评价指标,根据仿真分析结果,在高低温箱中,对该红外光谱仪的背景辐射影响采取抑制措施并进行了实验测量,实验结果证明:采取背景辐射抑制措施后,C-T型平板波导光谱仪系统的杂光系数在常温下（298 K）能达到5%以下。     

飞行人员代谢综合征患者胰岛素受体第8外显子Nsi Ⅰ位点基因多态性研究

目的研究胰岛素受体（INSR）基因多态性与飞行人员代谢综合征（MS）的相关性。方法采用聚合酶链反应-限制性片段长度多态性（PCR—RFLP）和基因测序技术检测38名飞行人员MS患者和50名正常健康飞行人员INSR第8外显子Nsi I位点基因多态性。结果INSR第8外显子Nsi I位点的基因型和等位基因在飞行人员MS组和正常健康对照组存在统计学差异,INSR基因N2等位基因频率在MS组高于对照组（P〈0．01）。结论INSR第8外显子Nsi I位点基因多态性与飞行人员MS相关,N2等位基因可能是一个易感基因：