邻菲咯啉金属络合物型发光材料的合成及性能研究

设计并通过4步合成了一种新型的联有邻菲咯啉配位基和发光性能优良的萘基的金属络合物型发光材料化合物（PAN）2Zn,并对其进行了表征.研究表明,最佳的反应条件为：硼酸酯用三异丙基硼酸酯,超声功率为175W,超声时间为15 min,C-C偶合反应的催化剂Pb（OAc）2/P（Ph）3=1∶4（mol）,温度为140℃.另外对它的光物理性能进行了初步的研究,结果表明：（PAN）2Zn的最大发射波长为360 nm,并且能够形成激基缔合物,存在明显的溶剂效应,是比较理想的蓝光材料.     

Extracellular matrix and neuronal movement

Summary During brain development, both neuronal migration and axon guidance are influenced by extracellular matrix molecules present in the environment of the migrating neuronal cell bodies and nerve fibers. Glial laminin is an extracellular matrix protein which these early brain cells preferentially attach to. Extracellular glycosaminoglycans are suggested to function in restricting neuronal cell bodies and axons from certain brain areas. Since laminin is deposited along the radial glial fibers and along the developing nerve pathways in punctate form, the punctate assemblies may be one of the key factors in routing the developing neurons in vivo. This review discusses the role of laminin in neuronal movement given the present concept of the extracellular matrix molecules and their proposed interactions.     

Spatiotemporal programs and genetics of orientation

Summary A number of migratory bird species have endogenous annual rhythms that regulate the entire annual cycle including the migratory portion. Moreover, captive migrants display inherited migratory activity; this could theoretically also be used by free-living migrants as a time-program for migration. Finally, this heritable migratory activity is oriented in a seasonally appropriate direction even in naive birds. These, characteristics should enable inexperienced migrants isolated from contact with experienced conspecifics to utilize a heritable vector-navigation program to migrate from the breeding grounds to the winter quarters. That is, migrants should reach goal areas they have never experienced by migrating in programmed directions, for as long a period as the genetically fixed time-program for migratory activity induces them to do so. The time-course of migration as established by trapping stations, theoretical influences of environmental variables on migratory programs, and also compensatory behavior and migratory backup measures, are discussed. The present evidence supports the view that a large number of migrants are essentially brought to their wintering areas by vector-navigation systems.     

Wind and orientation of migrating birds: A review

Summary Migratory flights are strongly affected by wind, and birds have developed many adaptations to cope with wind effects. By day, overland migrants at high altitudes may often allow crosswinds to drift their tracks laterally from the preferred heading. In contrast, many birds at low altitude adjust their headings to compensate for drift, and may overcompensate to allow for previous drift. The relative motion of landscape features is probably used to sense drift, at least by day. By night, some overland migrants compensate fully for drift but others do not; no pattern is obvious. Over the sea, compensation is rarely if ever total; wave patterns may allow partial compensation. Other adaptations can include reduction of drift by flying at times and/or altitudes without strong crosswinds. Some birds recognize the need to change course to allow for previous wind displacement, and reorient at least roughly toward the original route or destination. Some juveniles en route to previously-unvisited wintering grounds seem to have this ability, but corroboration is needed. Such reorientation may not require a true navigation ability. However, some birds have unexplained abilities to sense the wind while aloft.     

厌氧处理结合超声空化高效破解剩余污泥

为了提高超声空化破解剩余污泥的效率,进而提高污泥的可生化性能,提出先进行短时间的厌氧处理,再进行超声空化的破解方案;并对厌氧0~6 d的污泥进行了超声破解实验研究.实验结果显示:随着厌氧时间的增加,污泥自身性质发生较大改变,如化学需氧量(COD)、肽聚糖浓度大幅度增加,p H值明显降低等;对厌氧污泥进行破解,其破解效果优于新鲜污泥:对厌氧6 d的污泥进行破解,其COD浓度是新鲜污泥的99.3倍,是新鲜污泥破解后的9.5倍.厌氧处理可以降低污泥的破解难度,在较大程度上提高超声空化强度,该工艺可以实现高效破解剩余污泥的目的.     

激光超声表面波检测薄板残余应力的数值模拟

应用ABAQUS有限元软件模拟了脉冲激光激发的超声表面波在半无限大弹性薄板内的传播.首先把激光激励等效为作用在薄板表面的高斯分布的脉冲载荷,模拟输入的超声信号,在边界处采用无限单元来消除边界反射波对接收信号的干扰,接收到的表面波信号具有典型的表面波特点.其次,通过修正弹性模量的方法得到薄板在单向应力状态下的应力场,采用时差法得到表面波在应力区的传播速度,所得的数值结果和理论解与实验结果拟合良好,为激光超声检测残余应力提供了一种有效的数值方法.     

黄连羊肝丸中小檗碱百分含量测定

考察不同厂家黄连羊肝丸中小檗碱百分含量,比较不同厂家黄连羊肝丸的质量.主要通过高效液相色谱法(HPLC),对不同厂家的黄连羊肝丸中主要成分小檗碱进行百分含量测定,高效液相色谱法测定盐酸小檗碱的回归方程为:Y=37.643X+0.987 4,r=0.999 3,线性关系良好.测定结果显示,以小檗碱百分含量计,百分含量最高为"赤峰天奇制药有限责任公司(水蜜丸)",为0.23%;百分含量最低为"北京同仁堂股份有限公司同仁堂制药厂(蜜丸)",为0.11%.不同厂家的黄连羊肝丸由于制作工艺不同,原材料差异,导致药品质量存在差异,但均在药典规定范围内,不影响产品使用.高效液相色谱法应用于中成药的百分含量测定具有简便、灵敏度高、重复性好等优势,可以为黄连羊肝丸质量标准制定奠定基础.