Post-collisional extensional and thrust-nappe structures in northern part of Dabie Mountains

Thrust-nappe structures and extensional structures simultaneonsly occur in the northern part of the Dabie Mountains. The systematic structural study reveals that extensional structures along the Mozitan-Xiaotian fault and thrust-nappe structures that take the Jinzhai-Shucheng fault as their frontal thrust share the same shear sense, and display a transitional relationship from the ductile extensional structure of deep level in the south to the ductile-brittle and brittle thrust-nappe structure of shallow level in the north. The extensional and thrnst-nappe structures in the region are explained to result from post-collisional processes by the continuous subduction of the Yangtze continental block and the extension induced by the uplifting of the core part of the Dabie Mountains, which are components of the exteasional structures produced in the exhumation process of the ultrahigh pressure metamorphic rocks in the Dabie Mountains. Because of the frontal blocking in the process of the north-westward spreading, the extension and detachment of the low-grade metamorphic rocks along the Mozitan-Xiaotian fault was transformed into the northwestward thrustiag, resulting in the thrust-nappe structures. They developed in the period of 200-170 Ma, maybe last till the late Jurassic.     

用半导体激光器作调制器的波长连续可调谐锁模光纤激光器

将F－P LD与环形光纤激光器结合起来，以LD作为调制器，与M－Z干涉型调制器相比，大大减小环形腔内的损耗，在较低的增益下仍可得到稳定的锁模脉冲。并通过改变LD工作温度实现激光波长连续调谐，调谐范围1nm。所得脉冲重复速率约为2GHz，脉冲宽度平均50ps。     

基于蒙皮法的NURBS自由曲面设计

给出了用Ｎｕｒｂｓ截面曲线构造自由曲面的蒙皮法，重点研究了用一条脊线和一线截面线来构造工程上常用自由曲面的Ｎｕｒｂｓ曲面蒙皮法，该方法适合于平面脊线同时有多条截面线的自由曲面生成。     

The white schist assemblage in the kyanite quartzite from the ultrahigh-pressure metamorphic belt, eastern Dabie Mountains

The kyanite quartzite from the ultrahigh-pressure metamorphic belt in the eastern Dabie Mountains is composed mainly of quartz, kyanite, talc and epidote, which contains a typical mineral assemblage of white schist. It suffered an eclogite facies metamorphism of P =(2 4±0 3) GPa and T =630℃ together with coexisting eclogite. The protolith may be an aplite replaced by high-pressure fluid of eclogite facies.     

高职学院软件技术专业校外实习教学实践的改革研究

以湖南商务职业技术学院的软件技术专业实践教学课程设置为研究对象,分析高职学院软件技术专业实践教学的不足;结合目前我国高职学院软件技术专业校外实习教学的现状,论述了软件技术专业加强校外实习教学的必要性和重要性.实践表明,教师的专业教育成功地转变为学生的职业体验,实现软件技术专业毕业生真正意义上的"零距离上岗".     

Call in question and discussion: Are there sandwiched low-grade metamorphic slabs within UHP metamorphic rocks in the Dabieshan terrane

Some geologists reported their discovery of sandwiched low-grade metamorphic slabs within UHP metamorphic Complexes in Changpu, Yuexi County, Anhui Province. They also suggested that some coesite-bearing eclogites are igneous veins, which intruded low-grade metamorphic slabs and other related rocks. Moreover they further called in question to UHP metamorphic process and continental collision tectonism in the Dabieshan terrane. Based on our recent study, so-called low-grade metamorphic slabs are strongly deformed fabric, fine-grained and tectonic recrystallized mylonites and tectonites. Their protolith rocks are garnet-bearing orthogneiss, eclogite and marble, as well as a few amounts of strongly deformed acid and basic veins. Their metamorphic, geochemical and geochronological characteristics are also identical with UHPM rocks and regional country orthogneisses. Therefore we conclude that there are not low-grade metamorphic slabs sand wiched with UHP metamorphic rocks in the Dabieshan terrane.     

基于WAsP的不同风资源下风力机的选择

提出了一种确定适合于不同地区的风力机的方法。首先利用WAsP软件对当地风能资源评估,分析计算得到风谱图,建立模拟风力机站;然后拟合4种类型的400W风力机的输出功率特性曲线;最后计算不同风力机在不同地区风资源下的单位面积月发电量及其变动率。在保证满足供电负荷的条件下,单位面积月发电量的变动率最小的风力机确定为该地区风力机。     

时频域动态反褶积方法研究

大多数提高地震资料分辨率的反褶积方法都基于传统静态褶积模型,这与非均匀介质中的地震子波实际传播
规律不符。因此,在动态褶积模型基础上,结合地震波在地层中的吸收衰减特性,提出一种基于时频域的动态反褶积
方法。该方法将广义S 变换良好的多分辨特性引入到地震资料动态反褶积处理中,首先将非平稳地震记录的广义S
变换近似表示为静态震源子波的傅里叶变换、复数值时频衰减函数与反射系数广义S 变换的乘积,再采用多项式拟合
的方法对非平稳地震记录时频谱进行平滑处理,从而可估算动态传播子波和地层反射系数。本文方法不需要直接求
取Q 值,能够适用于变Q 值情况。理论模型和三维实际资料处理结果表明,该方法不仅能改善地震资料的分辨率,还
能有效补偿深部地层吸收所引起的能量衰减。     

基于ESDA的省域旅游综合竞争力的区域差异空间分析

基于统计软件SPSS13．0,采用多指标综合评价的主成分分析法,对中国大陆31个省、市、区旅游综合竞争力进行了综合评价;在GeoDA,Arcview等空间统计分析软件的支持下,利用ESDA全局和局部空间自相关理论,探测了省域旅游综合竞争力空间自相关和空间异质性．结果表明：各省市旅游综合竞争力的空间分布表现出相似的观测值趋于空间集聚;较强旅游综合竞争力的邻接省域趋于空间聚集,并主要集中在以上海为核心的长江三角洲地区及东部沿海地区;旅游综合竞争力较弱的邻接省域则主要集中在西北内陆省区;四川省是一个旅游综合竞争力显著高值被低值包围的区域．     

小型方向图可重构四单元缝隙天线的设计

提出一种小型方向图可重构天线.该天线是由4个缝隙单元组成的平面阵列,单一的缝隙单元能产生定向辐射方向图,且最大辐射方向是接近缝隙的开口端.将4个PIN二极管集成在4个缝隙单元上,通过4个二极管开关的导通与断开组合成不同的模式,使天线在xoy平面上获得8个定向和多个全向的辐射方向图.仿真结果表明:该天线的定向最大增益为2.90 dBi,全向最大增益为1.38 dBi,半功率波束宽度平均值为136°.该天线是半径为31 mm的圆,体积小,制造成本低,且满足无线通信频段2.40~2.50 GHz,适用于无线局域网(WLAN)等无线通信领域,可以降低多径衰落的影响,提高数据的传输速率.