助听器芯片中的采样率变换数字滤波器设计

分析了助听器芯片中Σ-Δ ADC的降采样滤波器、上采样滤波器的原理及实现技术。优化滤波器结构和滤波器系数,降低了芯片面积。采用可编程配置的滤波器系数,实现通带平坦度与过渡带带宽、采样率之间的动态切换。采用SMIC 130 nm 1P8M CMOS工艺进行了MPW流片验证。结果表明,该滤波器可支持16 kHz、32 kHz采样率,满足不同采样率助听器DSP的需求。级联后滤波器的通带纹波为0.001 dB,阻带衰减达80 dB,群延时之和最大值为3.877 ms,满足助听器信号转换电路的要求。     

Shadow Inpainting and Removal Using Generative Adversarial Networks with Slice Convolutions

In this paper, we propose a two‐stage top‐down and bottom‐up Generative Adversarial Networks (TBGANs) for shadow inpainting and removal which uses a novel top‐down encoder and a bottom‐up decoder with slice convolutions. These slice convolutions can effectively extract and restore the long‐range spatial information for either down‐sampling or up‐sampling. Different from the previous shadow removal methods based on deep learning, we propose to inpaint shadow to handle the possible dark shadows to achieve a coarse shadow‐removal image at the first stage, and then further recover the details and enhance the color and texture details with a non‐local block to explore both local and global inter‐dependencies of pixels at the second stage. With such a two‐stage coarse‐to‐fine processing, the overall effect of shadow removal is greatly improved, and the effect of color retention in non‐shaded areas is significant. By comparing with a variety of mainstream shadow removal methods, we demonstrate that our proposed method outperforms the state‐of‐the‐art methods.     

神经元高低状态切换发放的神经动力学

研究单个神经元的膜电位在高、低两个不同状态之间切换发放的动力学过程,考察了在没有任何刺激发生的情况下出现的具有周期性质的自发活动,以及膜电位活动的两态切换.研究结果表明上述的切换随着参数的变化使得高、低状态切换的膜电位发放具有双向性及单向性的动力学特征,这些特征不仅揭示了神经元特有的皮层状态功能,还与神经电生理的实验结果相符.     

The effect of impeller-to-tank diameter ratio on draw down of solids

The effect of impeller-to-tank diameter ratio (D/T) on the draw down of solids was investigated using a mixed flow impeller (pitched blade turbine) and a narrow blade hydrofoil (LE-20) of D=T/2 and T/3. Operational conditions (impeller speed and power consumption) at which solids do not remain at the liquid surface for more than 2- were determined for a given solid type (polyethylene particles) at a given concentration (X=1%). Under selected conditions, liquid velocity values were obtained from LDA measurements and CFD simulations to better interpret the findings.Both upward and downward pumping modes were studied with the impeller mounted over a range of submergences, and different mechanisms of draw down were noted. For LDA measurements and CFD simulations, only the upward pumping PBT was considered. These were carried out under conditions where draw down did not occur through air ingesting vortices.When solids were drawn down without air being entrained from the surface, a smaller diameter impeller (D=T/3) was more energy efficient, although it required higher speeds to achieve draw down. Results from LDA measurements and CFD simulations showed that the discharge flow from a larger impeller has a stronger radial component of flow, and as a result the liquid is directed towards the vessel walls rather than the surface which supported this finding. The only exception to this was when solids were drawn down along with air through vortices. In this case, the power demand could be lower with a larger diameter impeller.     

江苏京阳水泥厂石灰石取料机的提产改造

京阳水泥厂LH0450／44型石灰石取料机（BMH公司产品）原最大取料能力为450t／h，为配合熟料线提产的需要，南京院对其实施了提产改造。其中改造内容主要包括头部传动装置改造、刮板尺寸改造、大车慢行电机更换等等。改后运行效果良好，达到了取料能力550eh（最大600eh）的改造要求。     

无线接入网自主覆盖优化方法

提出了自主覆盖优化方法(ACOS),该方法适用于无线接入网的下行覆盖优化,无需人工干预,利用移动台测量报告中的数据,评定下行覆盖状况,并生成优化调整方案,各小区根据方案调节发射功率实现优化.仿真结果验证了在下行覆盖不足和下行覆盖过度场景中,ACOS都可以有效提高网络覆盖质量,可使各项覆盖指标达到目标参考值的要求.     

基于ARX模型的控制系统辨识及稳定性分析

应用系统辨识技术,基于ARX模型,建立了热连轧机液压压下控制系统的动态数学模型.系统的输入和输出数据分别采用轧机压下闭环系统电液伺服阀控制信号和辊缝位移信号;模型的参数估计采用最小二乘估计法(LSCE),模型阶的辨识采用赤池信息准则(AIC).使用数据验证模型3步预测输出数据,并与实际测量数据对比研究了辨识模型的拟合精度,采用残差分析法检验了模型的有效性.仿真分析结果表明:辨识的模型是有效的.建立的轧机压下控制系统的数字化模型是计算机仿真分析的基础,也是控制器优化设计的依据,同时也为研究轧机振动特性提供了重要手段.     

论“雪莲精神”传承的文化机制

“雪莲精神”是空军雷达学院在多年办学实践中逐步形成的、具有雷达兵特色的大学精神,其内涵是扎根高原、傲霜斗雪、顽强不屈、默默奉献．运用院校研究的方法,以“雪莲精神”的形成与传承为案例,揭示了学校精神从萌芽、提升到传承和发展的阶段性规律,提出了以内化、深化、泛化和感化为基本环节的文化传承机制．     

国内非开挖内衬工艺中相似工艺的技术对比分析

近年来，随着全社会环保意识的增强，具有保护城市道路环境优势的非开挖内衬修复埋地管道技术逐步被社会各界所接受。如何科学地认识和使用各种非开挖内衬技术，便成为保证各类埋地管道修复质量，维护城市功能正常运行的重要问题。本文从应用技术角度对目前市场上出现的各类非开挖内衬工艺进行了技术对比分析，以期达到帮助各行业埋地管道管理部门提高应用非开挖内衬技术水平的目的。     

低纤维素型全位置立向下焊条的研究

在大量试验基础上,研制了一种纤维素含量较低的全位置立向下焊条,该焊条兼具普通钛型焊条和纤维素型焊条的优点,具有优良的焊接工艺性能;同时该焊条还具有良好的力学性能和抗裂性能,可广泛用于重要结构的焊接.