涵道捡乒乓球机器人的设计与实现探究

文章设计了一种自动乒乓球捡球机器人,该机器人采用STM32单片机作为控制系统,利用涵道的高速旋转,使壳体内外产生一定的压强差,将外界的乒乓球压进壳体,实现自动捡球的目的,在装置的最底部安装了可以旋转的拨球装置,尽量的做到整个壳体的密闭性。     

厚膜半导体工艺在气敏元件生产中的应用

文中讲述了将厚膜半导体工艺应用于气敏元件的生产制作,综合运用精密丝网印刷、激光分割、激光调阻、平面绑定等先进技术,达到了高质量、高效率生产气敏元件的效果.应用半导体工艺制作的气敏元件相比传统工艺制作的产品具有体积小、功耗低、机械性能好、批次一致性好等优点.     

能源互联网结构形态及技术支撑体系研究

能源互联网作为可再生能源大规模高效利用的重要基础设施,成为当前能源领域的热点研究课题。在分析对比国内外关于能源互联网内涵及结构形态的基础上,提出完整一次能源系统、电力系统、交通网络及信息网络组成的新的能源互联网内涵及相应的新型结构形态,并对新型结构形态的各部分之间的关系进行详细阐述;对所提的新型能源互联网结构形态设计相应的技术支撑体系。     

多层结构半导体气敏元件制备工艺探索

按照多层结构半导体气敏元件设计,制备介质浆料作为加热层和气敏层间的隔离材料,实现在陶瓷基板的同侧制作加热层和气敏层,降低平面式半导体气敏元件工艺难度。在陶瓷基板的另一侧制作隔热层,降低气敏元件功耗。与传统陶瓷管芯旁热式结构相比,该结构可以采用印刷工艺制作,提高了产品之间性能的一致性。     

Stress field evolution law of mining environment reconstructing structure with change of filling height

For improving global stability of mining environment reconstructing structure, the stress field evolution law of the structure with the filling height change of low-grade backfill was studied by ADINA finite element analysis code. Three kinds of filling schemes were designed and calculated, in which the filling heights were 2, 4, and 7 m, separately. The results show that there are some rules in the stress field with the increase of the filling height as follows: (1) the maximum value of tension stress of the roof decreases gradually, and stress conditions are improved gradually; (2) the tension stress status in the vertical pillar is transformed into the compressive stress status, and the carrying capacity is improved gradually; however, when the filling height is beyond 2.8 m, the carrying capacity of the vertical pillar grows very slowly, so, there is little significance to continue to fill the low-grade backfill; (3) the bottom pillar suffers the squeezing action from the vertical pillars at first and then the gravity action of the low-grade backfill, and the maximum value of tension stress of the bottom pillar firstly increases and then decreases. Considering the economic factor, security and other factors, the low-grade backfill has the most reasonable height (2.8 m) in the scope of all filling height.     

一种PMIPv6的LMA可靠性保证机制

PMIPv6是基于网络的移动性管删协议,作为其核心实体,本地移动锚点（Local Mobility Anchor,LMA）功能的可靠性直接关系到整个网络的稳定运行。文中提出了一种保证LMA可靠性的机制,该机制定义一个由备用LMA组成的冗余集,通过对当前活跃LMA和冗余集中备用LMA之间的切换管理,实现在LMA失效情况下移动性管理功能的延续性和服务状态的一致性,从而保证整个PMIPv6网络的稳定运行。通过对机制开销的理论分析,表明所提机制最适合LMA失效概率小,PMIPv6域小的应用场景。     

基于P2P-DHT节点搜索的SIP网络电话设计

结合P2P-DHT(CHORD)节点搜索算法,对SIP协议进行扩展,把基于DHT的全分布式结构化P2P网络架构引入基于SIP协议的网络电话系统,设计了一种新型的P2P-SIP网络电话系统。该方案克服了原有系统需要集中式目录服务器的缺点,在中小规模的网络电话领域具有很好的应用前景。     

Semi-definite programming based pulse waveform design and its further analysis

In order to provide a judicious pulse waveform design required for ultra-wideband（UWB）communication to enable the UWB spectral mask compatible and coexistent with other existing wireless communication systems,a semi-definite programming（SDP）based pulse waveform design method for UWB radios is introduced and a further analysis is given in this paper.By using Sedumi and Yalmip toolboxes of Matlab,the procedure of solving the SDP problem is simplified.Simulation results show that this SDP based pulse waveform design method can be used to design pulses that fulfill the Federal Communications Commission（FCC）spectral mask strictly and optimize the power efficiency at the same time.This paper also analyzes the influences of the power efficiency duing to the changes of sampling interval and the number of combined pulses,and then the optimal sampling interval that maximizes the transmission power can be found.     

认知超宽带无线电自适应波形设计算法

为了解决认知超宽带与窄带系统共存问题,实现认知超宽带无线电自适应波形设计,采用高斯函数的加权叠加作为认知超宽带脉冲波形.通过将波形设计问题转化为线性滤波器设计问题,采用Parks-McClellan算法进行求解,实现了任意中心频率和带宽陷波的波形设计.并进一步提出了利用权重值数组控制不同频带陷波深度的方法.仿真结果表明,所设计波形的功率谱密度在WLAN频段上可以实现约-30 dB的陷波,同时也可以实现多个频段陷波的波形设计.根据实际需要选择权重值可以控制各个频段的陷波的深度.     

电动汽车充换电网络系统的安全认证机制设计

电动汽车的无线充换电通信系统中,信道的开放性带来了安全问题.车辆用户真实身份的隐私保护和非法用户的可追踪性是两个互相矛盾的要求,安全认证技术的复杂度和时延要求也相互制约.围绕这两方面的需求,基于LTE-V2X车联网体系架构,设计一种具备强隐私保护能力的匿名认证机制.该机制同时满足V2X(Vehicle to Everything)通信的隐私性、匿名性、可鉴别、可追踪、完整性保护等多方面安全需求.基于NS-3网络仿真平台,对认证机制进行仿真实现,仿真结果满足安全需求,并证明了该机制具有实际部署能力和可扩展性,时延在毫秒量级,满足时延敏感的车联网环境下充换电通信业务的需求.