短波单边带通信系统中数字化中音频的实现

数字信号处理技术（ＤＳＰ）相对于模拟信号处理在电路的精确性、灵活性、可靠性等方面有一个质的飞跃。ＤＳＰ用于短波通信系统的调制、解调可以灵活地通过软件来实现,大大地提高了性能指标。将ＤＳＰ技术应用到短波单边带通信系统中有以下几种模式：将ＤＳＰ技术应用于一混频之前、将ＤＳＰ技术应用于三混频之前和将ＤＰＳ技术应用于二混频之前。本文给出了数字化短波单边带通信系统中实现数字化中音频的实施方案（发信机和收信机     

多乙酰氧基烷基(艹卓)酮和多羟基烷基(艹卓)酮的合成

各种溴代的烷基酚酮的乙酸酯用乙酸酐/三氟乙酸酐/乙酸(以下简称ATA)醋解可得高收率的相应的多乙酰氧基烷基酮,后者经稀酸水解几乎定量地得多羟基烷基酮。部分多乙酰氧基酮对肺癌A_(549)和上皮细胞癌显出抑制活性。     

胡智琴一声"大哥"丁磊泪流页面

有那么一天,网易摘星行动总决赛结束。网易市场销售高级副总裁胡智琴对丁磊叫了一声：“大哥,我们又亏了XXX万！”只见那丁磊,泪流页面,仰天长叹：“为什么流氓燕和芙蓉姐姐都是点击率和利润都能套现?网易的PV Money兑现却那么艰难?”     

A new heuristics model of simulating pedestrian dynamics based on Voronoi diagram

A new heuristics model based on the Voronoi diagram is presented to simulate pedestrian dynamics with the noncrowded state, in which these mechanisms of preference demand evading and surpassing, microscopic anti-deadlock, and site-fine-tuning are considered. The preference demand describes the willingness determination of detouring or following other pedestrians. In the evading and surpassing mechanisms, in order to achieve a balance between avoiding conflicts and minimizing detour distances, a new pair of concepts: "allow-areas and denial-areas" are introduced to divide the feasible region for pedestrians detour behaviors, in which the direction and magnitude of detour velocity are determined.A microscopic anti-deadlock mechanism is inserted to avoid deadlock problem of the counter-directional pedestrian. A site-fine-tuning mechanism is introduced to describe the behavior of avoiding getting too close to the neighbors in pedestrian movement. The presented model is verified through multiple scenarios, including the uni-or bi-direction pedestrian flow in the corridor without obstacles, the uni-direction pedestrian flow in the corridor with obstacles, and the pedestrian evacuation from a room with single-exit. The simulation results show that the velocity–density relationship is consistent with empirical data. Some self-organizing phenomena, such as lanes formation and arching are observed in the simulation.When pedestrians detour an obstacle, the avoiding area before the obstacle and the unoccupied area after the obstacle can be observed. When pedestrians evacuate through a bottleneck without panic, the fan-shaped crowd can be found, which is consistent with the actual observation. It is also found that the behavior of following others in an orderly manner is more conducive to the improvement of the overall movement efficiency when the crowd moves in a limited space.     

用于在体神经递质检测的可佩戴式无线电化学检测仪

为了实现对微弱神经递质信号的在体实时检测,设计并实现了一种无线电化学检测仪器。系统硬件以低功耗微控制器MSP430为主控制器,包括了微弱电流检测模块、波形产生模块以及数据收发模块,具有尺寸小(2.3 cm×1.8 cm×0.6 cm),功耗低的特点。基于u C/OS操作系统设计了系统的下位机程序,结合上位机软件实现了检测数据的实时显示与分析。针对神经递质的实际检测需求,系统集成了计时电流法与快速循环伏安法两种电化学检测分析方法。利用快速循环伏安法对不同浓度的多巴胺标准溶液进行了测试,在浓度范围5.0×10#7~7.0×10#5mol/L内,系统检测的响应电流与多巴胺浓度之间线性相关系数R=0.99。在此基础上,开展了大鼠在体多巴胺检测的实验,并成功检测到大鼠尾状壳核脑区的电诱发多巴胺释放信号。实验结果表明,此仪器具有检测灵敏度高的优点,能够实现对大脑内神经递质信号的定性及定量分析,在神经科学研究领域具有广阔的应用前景。     

TD-LTE海面超远距离覆盖研究与测试

为验证TD-LTE网络的覆盖能力,本文重点分析特殊参数配置（特殊子帧配置、Preamble格式）、天馈有效高度等对TD-LTE超远距离覆盖的影响,并结合频段选用、覆盖增强技术等对海面场景超远覆盖技术方案进行了深入探讨,依据实际测试情况进行分析和总结。     

爆破地震效应若干问题的探讨

对爆破地震效应的若干问题进行了研究，提出了一些新的观点。内容包括:微差爆破问题；焊破地震动转动分量的推算；地震荷载的计算；基于多维反应谱方法的内力组合。     

用样条法研究高速滑行体的运动

研究高速滑行体在规则波浪中滑行时，得到了二阶常微分方程组，本文应用样条插值求积方法和三次样条配点计算，求解滑行体在不同波浪条件下的纵倾和升沉的响应，实例计算结果与实验值比较一致。