采用差示扫描量热(DSC)、热重-微商热重(TG-DTG)分析技术,研究了3,6-二肼基-1,2,4,5-四嗪(DHT)在0.1MPa下的热分解性能;选择8种铅铜催化剂,研究了其对DHT催化热分解行为的影响。结果表明,DHT的热分解包含两个过程:第一阶段为主分解过程,主要为四嗪环的开环反应;第二阶段为前阶段分解凝聚相产物的再分解过程。所选铅铜催化剂均可明显降低DHT的分解峰温并增加其分解热,铜催化剂比相应的铅催化剂对DHT分解峰温的降低效果更加显著,铅催化剂比相应的铜催化剂对DHT分解热的提高效果更加显著。与单一的铅或铜催化剂相比,铅铜复合催化剂可以进一步降低DHT的分解温度并增加分解热。

The thermal decomposition characteristics of 3,6-dihydrazino-1 ,2,4,5-tetrazine(DHT)and the influences of eight kinds of lead/copper compounds on thermal decomposition properties of DHT were investigated by differen-tial scanning calorimeter(DSC)and thermogravimetry-derivative thermogravimetry (TG-DTG).The results show that there are two stages in the decomposition process of DHT,the first stage is the main decomposition process which is the ring opening reaction for tetrazine ring,and the second stage is the decomposition for condensed phase products of the first stage.The thermal decomposition peak temperature of DHT is significantly decreased and the exothermic quantity of DHT is increased by mixing DHT with lead compounds or copper compounds.Copper com-pounds have a better effect on decreasing decomposition temperature of DHT than lead compounds,while lead com-pounds have a better effect on increasing exothermic quantity of DHT than copper compounds.Compared with sin-gle lead or co

探讨脑室内注射5,7-双羟色胺(5,7-DHT)对内侧前额叶皮层(mPFC)锥体神经元5-羟色胺-1A(5-HT1A)受体敏感性的影响,阐明5-HT1A受体对锥体神经元电活动的作用。方法:36只雄性SD大鼠随机分为假手术组(n=21)和5,7-DHT损毁组(n=15)。损毁组大鼠脑室内注射5,7-DHT,假手术组大鼠脑室内注射同等剂量生理盐水,2组大鼠静脉注射不同剂量(0.5~128.0μg·kg-1)5-HT1A受体激动剂8-OH-DPAT,采用体细胞外电生理学方法观察mPFC中锥体神经元放电频率的变化,并静脉注射5-HT1A受体拮抗剂WAY100635,观察损毁组大鼠对5,7-DHT激动剂和拮抗剂的敏感性,并与假手术组进行比较。结果:在假手术组中,不同剂量(0.5~128.0μg·kg-1)8-OH-DPAT对大鼠锥体神经元的放电频率均产生兴奋-抑制式的影响,这些神经元在低剂量(0.5~32.0μg·kg-1)时被兴奋,放电频率增加(P0.05);而在高剂量(128.0μg·kg-1)时则被抑制,放电频率减少。在损毁组中,不同剂量(0.5~128.0μg·kg-1)8-OH-DPAT剂量依赖性地抑制大鼠锥体神经元的电活动(df=5,F=3.44,P=0.003),即放电频率减少,未见兴奋-抑制效应;WAY10035可以反转8-OH-DPAT的抑制作用。结论:脑室内注射5,7-DHT可使大鼠mPFC锥体神经元5-HT1A受体敏感性降低。

Objective To explore the influence of intraventricular injection of 5, 7-drhydroxytryptamine (5, 7-DHT)in 5-HT1A receptor sensitivity of medial prefrontal cortex pyramidal neurons in the rats,and to clarity the effect of 5-HT1A receptor on the eletronic response of pyramidal neurons.Methods 36 male SD rats were randomly divided into sham operation group (n=21)and 5,7-DHT lesion group (n=15).5,7-DHT was injected intraventricularly in the rats in 5,7-DHT lesion group,and the same dose saline was injected in the rats in sham operation group.The rats in two groups were intravenously injected with different doses(0.5-128.0μg·kg-1 )of 8-CH-DPAT.The firing rate of mPFC pyramidal neurons was recorded with extracellular electrophysioological examination.The rats in two groups were intravenously injected with WAY100635,the sensitivites of the rats to 8-OH-DPAT and WAY100635 in 5, 7-DHT lesion group were observed, and compared with sham operation group.Results The different doses (0.5

采用温湿度传感器DHT11,以ARM嵌入式芯片为核心,配以显示键盘等相关电路,实现了实验室内温度和湿度的无人全天候监控,并具有报警提示等功能。

With DHT11 used as temperature & humidity sensor and ARM as embedded controller ,a temperature and humid monitoring system is designed for unmanned laboratory environment supervision during 24 hours ,in w hich alarm is installed .

基于单片机与数字传感器DHT11,设计了一种简易的温湿度测控系统。分析了DHT11的内部结构、时序和工作原理,提出了采用74L151实现8路切换式多点测量的方法,设计了数字传感器、键盘、LCD液晶显示器和数据选择器与单片机的接口电路。结合硬件给出了测量系统的程序流程。通过室内温湿度模拟实验,得出系统的线性度为1.5%;重复性:湿度为2%RH,温度为1℃;精度:湿度±2%RH,温度±1.5℃;分辨率:湿度1%RH,温度1℃。

Based on both MCU and DHT11 digital sensor, a simple temperature and humidity measurement and control system was designed;and DHT11 digital sensor’s internal structure, timing sequence and working principle were analyzed to propose the method of employing 74L151 to realize 8-way multi-point detection and to design an in-terface circuit between the MCU and the digital sensor , keyboard, LCD liquid crystal display and the data selector , considering the system hardware , the software program flow chart was presented .Simulation experiments on indoor temperature and humidity brings a 1.5%linearity, a 2%RH humidity and 1℃in repeatability, and a ±2%RH hu-midity and ±1.5℃in precision, as well as a 1%RC humidity and 1℃in resolution.

为了降低在无限(长)序列实值离散Gabor变换(RDGT)中利用分析窗与综合窗之间的双正交关系计算窗函数的复杂度,提出了一种基于离散Hartley变换(DHT)的快速求解算法。通过将双正交关系式写成离散Hartley变换的形式,原方程组可被分解成若干个独立的子方程组以降低计算的复杂度。实验结果也验证了提出的快速算法的正确性和有效性。

To reduce the high complexity of the window computation using the biorthogonal relationship between the analysis window and the synthesis window in the Real-valued Discrete Gabor Transform(RDGT)for infinite or long sequences, this paper presents a fast algorithm based on the Discrete Hartley Transform(DHT). By transforming the equa-tion set of the biorthogonal relationship into the form of DHT, the equation set can be separated into several independent sub-equation sets so that the computational complexity can be reduced. The experimental results also indicate that the pro-posed fast algorithm is correct and effective.