单片机及多种流量计在伺服阀气动配磨中的应用

介绍了一台三种形式流量计可任选并由单片机对测试过程进行控制,采样,计算并打印输出滑阀副搭接量值的试验设备。     

AN IMPROVED MEAN SURFACE METHOD FOR SUBSONIC PROPELLER NOISE PREDICTION

ＡＮＩＭＰＲＯＶＥＤＭＥＡＮＳＵＲＦＡＣＥＭＥＴＨＯＤＦＯＲＳＵＢＳＯＮＩＣＰＲＯＰＥＬＬＥＲＮＯＩＳＥＰＲＥＤＩＣＴＩＯＮＬｉＸｉａｏｄｏｎｇ；ＳｕｎＸｉａｏｆｅｎｇ；ＨｕＺｏｎｇａｎ；ＺｈｏｕＳｈｅｎｇ（Ｆａｃｕｌｔｙ４０７，ＢｅｉｊｉｎｇＵｎｉ...     

测液体粘滞系数的一种方法

本文介绍了一种测液体粘滞系数的方法－“落球法”，该方法装置简单，原理清楚，有利于拓宽学生的视野，培养和提高学生的实际技能和处理数据的能力。     

Optical sensors for monitoring and control of plant growth systems.

Optical chemical sensors have been developed for monitoring several parameters relevant to plant growth systems. These sensors utilize porous polymer and porous glass as the sensing element, and optical fiber input/output lines connected to a custom optoelectronic interface. Present in the sensing element are immobilized colorimetric indicators, which react with the analyte to be sensed. This reaction results in a change in the optical properties of the sensor. These sensors are particularly suited to in-situ monitoring of nutrient solution parameters and atmospheric trace contaminants in life support and plant growth systems. Sensors for monitoring pH, ammonia, and ethylene will be discussed.     

Validation of satellite-derived atmospheric temperature and water vapor concentration using radiosonde and rocketsonde measurements

Measurements of the spectral radiance of the earth's atmosphere from satellites can be related to the vertical structures of temperature and humidity. Derived profiles of these quantities are compared with radiosonde and rocketsonde observations, as well as with horizontal and vertical cross-sections of the atmosphere. In some regions of the atmosphere, particularly where large gradients are found, significant differences occur. A method for overcoming these by use of Typical Shape Functions is discussed. Transmittances computed from theory require modifications which are not well defined, and radiances measured from some satellite instruments disagree with computed values in ways which suggest calibration or instrument problems.     

预压涡轮泵喷嘴孔电火花加工工艺

研究了在环形工件端面加工斜孔的工艺方案,设计并制造了利于排屑并能进行快速深孔加工的电极,给出了工件翻转180°后刀具移动到孔心的计算公式。     

ARC-MET930测定铝合金中的金属元素

应用芬兰ARC-MET930金属分析仪,制作万能校准曲线,测定铝合金中的金属元素含量,优化了分析条件,讨论了分析结果的精密度和准确度。本方法具有准确度较高,成本低,分析快,操作简便,激发试样次数少等优点,用于快速定量分析,现场分析牌号,取得了满意的效果。     

机器人问题求解中的评价函数及矛盾和冗余的消除

本文提出了一种求解复杂的机器人问题的算法,该算法采用子问题求解与分层策略相结合,在动作规划过程中,建立了初始状态下的前指针和目标状态下的后指针,并形成一个决定动作排序优先级的评价函数,按不同的空间和时间段的差异,将全局的动作序列划分为若干子区域。本算法证明只需在子区域范围内消除冗余和矛盾,即可大大地提高系统的效率,在子区域范围内出现矛盾时,用优先级高的动作取代优先级低的动作,变矛盾为冗余,最后保留排在最前面的动作,而删除后面相同的动作,即消除了冗余。     

输油顺序对飞翼飞机的空中配平影响研究

通过对某飞翼飞机输油顺序的研究,分析了在不同输油顺序下飞机重心的变化情况及在不同重心位置下升降舵偏转角和飞翼飞机的配平状况.通过对最小配平阻力和飞机最佳重心位置的研究可知,改进飞机的输油顺序,可以增加飞机的巡航时间并改善飞机的操纵能力.     

复合材料构件R区的超声相控阵检测实验

针对复合材料构件R区的超声检测问题,开展超声相控阵检测实验研究.分析R区的检测难点,利用超声相控阵检测技术的优势,分别提出了基于相控阵弧阵换能器和线阵换能器的两种检测方法;对复合材料L型试样的R区进行超声相控阵检测实验,验证了两种检测方法的正确性;并与常规超声检测方法进行对比,分析了超声相控阵技术检测R区的技术优势.研究结果表明:超声相控阵检测技术具有适用性强、检测效率高等优势,可以满足复合材料构件R区的检测要求.