丙硫苯咪唑防治春羔秋季死亡的效果观察

春羔的秋季死亡对我区山羊生产的发展影响很大,据调查有的牧场死亡率达80%以上。为探索其发病死亡原因,笔者于1994年9月7日至12月7日,在我区镇源县黄草岭地区进行了丙硫苯咪唑防治效果观察,报告如下。材料和方法一、供试动物及分组供试动物均为黄草岭畜牧场和邻近的县农牧局基地1994年3、4月份所产山羊羔。按放牧单位,各随机编为投药组和对照(不投药)组(详见表1)。

宁夏新建二代防护林网蛀干害虫发生特点和危害特性

本文以宁夏银川二代林网中林分和害虫调查资料为基础 ,研究了二代林网主要蛀干害虫——光肩星天牛 (Anoplophora glabripennis Mostch)和木蠹蛾 [Cossus cossus ori-entalis Gaede &H olcocerus vicarius(Walker) ]分别在新疆杨林和刺槐林中因不同的树龄、径粗、林向、郁闭度、林地类型 (林缘和林内 )而呈现出的相应发生特点和为害特性。结果显示 ,新疆杨大于 6年生、胸径超过 1 2 cm径阶受光肩星天牛危害频率高 ;实验用片林林缘到林内 2 m范围内新疆杨受光肩星天牛危害显著高于林内 ,而东、西、南、北 4个方向 ,以东边受害最轻 ;与其它树种组成的混交林林缘同样重于林内。刺槐易受木蠹蛾危害的树龄和径节分别是 6 a～ 1 2 a和 1 2 cm～ 2 0 cm;刺槐片林无论是纯林还是混交林均为林缘重于林内。以上蛀干害虫对树龄和径粗均有较强的一致性选择

微囊藻毒素在细长聚球藻中的积累及其毒性效应

用 100μg/L 的微囊藻毒素(MC-RR)处理细长聚球藻,研究了 MC-RR 在藻细胞中的积累及其对细长聚球藻的生长和抗氧化系统的影响.结果表明,MC-RR 能在细长聚球藻中迅速积累,而细长聚球藻具有较强的降解 MC-RR 的能力,MC-RR 对细长聚球藻的生长具有显著的抑制作用;MC-RR 处理后,活性氧(ROS)和膜脂过氧化产物丙二醛(MDA)含量明显升高,还原型谷胱甘肽(GSH)含量和谷胱甘肽 S-转移酶(GST)、谷胱甘肽过氧化物酶(GPX)活性则有一个先降后升的变化.以上结果说明,细长聚球藻

鱊头槽绦虫原尾蚴皮层的超微结构观察

利用透射电镜观察了头槽绦虫 (Bothriocephalusacheilognathi)原尾蚴皮层的超微结构。头槽绦虫原尾蚴的皮层为典型的合胞体结构。皮层表面有浓密的微毛与少量的突起。与成虫相比 ,原尾蚴的微毛长而且粗 ,呈现单态性 ,推测在进入终末宿主的过程中有脱落和再生现象。突起分布在头部与体侧 ,含有较少的电子致密颗粒。在原尾蚴皮层细胞质中观察到三种腺细胞的分泌过程 ,即顶分泌、外分泌和微分泌过程。原尾蚴身体后部观察到尾钩和穿刺腺管道的开口。在核周区和纤维层下可见发育较好的环肌与纵肌。本文还对原

Learning based automatic face annotation for arbitrary poses and expressions from frontal images only

Statistical approaches for building non-rigid deformable models, such as the Active Appearance Model (AAM), have enjoyed great popularity in recent years, but typically require tedious manual annotation of training images. In this paper, a learning based approach for the automatic annotation of visually deformable objects from a single annotated frontal image is presented and demonstrated on the example of automatically annotating face images that can be used for building AAMs for fitting and tracking. This approach employs the idea of initially learning the correspondences between landmarks in a frontal image and a set of training images with a face in arbitrary poses. Using this learner, virtual images of unseen faces at any arbitrary pose for which the learner was trained can be reconstructed by predicting the new landmark locations and warping the texture from the frontal image. View-based AAMs are then built from the virtual images and used for automatically annotating unseen images, including images of different facial expressions, at any random pose within the maximum range spanned by the virtually reconstructed images. The approach is experimentally validated by automatically annotating face images from three different databases. © 2009 IEEE.

III-V compound semiconductor nanowires for optoelectronic device applications

GaAs and InP based III-V compound semiconductor nanowires were grown epitaxially on GaAs (or Si) (111)B and InP (111)B substrates, respectively, by metalorganic chemical vapor deposition using Au nanoparticles as catalyst. In this paper, we will give an overview of nanowire research activities in our group. In particular, the effects of growth parameters on the crystal structure and optical properties of various nanowires were studied in detail. We have successfully obtained defect-free GaAs nanowires with nearly intrinsic exciton lifetime and vertical straight nanowires on Si (111)B substrates. The crystal structure of InP nanowires, i.e., WZ or ZB, can also be engineered by carefully controlling the V/III ratio and catalyst size. © 2011 World Scientific Publishing Company.

ALGAL GROWTH POTENTIAL AND NUTRIENT LIMITATION IN SPRING IN THREE-GORGES RESERVOIR, CHINA

In China, especially in Three-Gorges Reservoir, our knowledge of the algal growth potential and nutrient limitation was still limited. In the spring of 2006, the water column ratios of total nitrogen/total phosphorus were investigated and algal bioassays performed to determine algal growth potential of waters and nutrient limitation of mainstream and Xiangxi Bay of Three-Gorges Reservoir. The results showed sampling sites in mainstream were co-limited by N and P or P-limited alone, and sites in Xiangxi Bay were N-limited alone. Fe likely played an important role in determining the appearance and disappearance of algal blooms of Three-Gorges Reservoir. Native algae, Pseudokirchneriella subcapitata and Cyclotella meneghiniana, had high growth potential in Three-Gorges Reservoir.

Effect of rapid thermal annealing and hydrogen plasma treatment on the microstructure and light-emission of silicon-rich oxide film

Silicon-rich silicon oxide (SRSO) films are prepared by plasma-enhanced chemical vapor deposition method at the substrate temperature of 200degreesC. The effect of rapid thermal annealing and hydrogen plasma treatment on tire microstructure and light-emission of SRSO films are investigated in detail using micro-Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy and photoluminescence (PL) spectra. It is found that the phase-separation degree of the films decreases with increasing annealing temperature from 300 to 600degreesC, while it increases with increasing annealing temperature from 600 to 900degreesC. The light-emission of the films are enhanced with increasing annealing temperature up to 500degreesC, while it is rapidly reduced when the annealing temperature exceeds 600degreesC. The peak position of the PL spectrum blueshifts by annealing at the temperature of 300degreesC, then it red-shifts with further raising annealing temperature. The following hydrogen plasma treatment results in a disproportionate increase of the PL intensity and a blueshift or redshift of the peak positions, depending on the pristine annealing temperature. It is thought that the size of amorphous silicon clusters, surface structure of the clusters and the distribution of hydrogen in the films can be changed during the annealing procedure. The results indicate that not only cluster size but also surface state of the clusters plays an important role in the determination of electronic structure of the amorphous silicon cluster and recombination process of light-generated carriers.

快速热退火和氢等离子体处理对富硅氧化硅薄膜微结构与发光的影响

采用micro-Raman散射、傅里叶变换红外吸收谱和光致发光谱研究了快速热退火及氢等离子体处理对等离子体增强化学气相沉积法200 ℃衬底温度下生长的富硅氧化硅（SRSO）薄膜微结构和发光的影响。研究发现在300-600 ℃范围内退火，SRSO薄膜中非晶硅和SiO_x:H两相之间的相分离程度随退火温度升高趋于减小；而在600-900 ℃范围内退火，其相分离程度退火温度升高又趋于增大；同时发现SRSO薄膜发光先是随退火温度的升高显著加强，然后在退火温度达到和超过600 ℃后迅速减弱；发光峰位在300 ℃退火后蓝移，此后随退火温度升高逐渐红移。对不同温度退火后的薄膜进行氢等离子体处理，发光强度不同程度有所增强，发光峰位有所移动，但不同温度退火样品发光增强的幅度和峰位移动的趋势不同。分析认为退火能够引起薄膜中非晶硅颗粒尺度、颗粒表面结构状态以及氢的存在和分布等方面的变化。结果表明不仅颗粒的尺度大小，而且颗粒表面的结构状态都对非晶硅颗粒能带结构和光生载流子复合机理发挥重要影响。