缆车转环精铸件的矫正与测量

缆车转环精铸件是由8个不均布的方齿圆盘通过三角形筋板与一个带止端的方管相连接而成,形状复杂,形状位置精度要求高。缆车转环精铸件采用无切削矫正模矫正后,不但可提高铸件精度等级,而且提高了方管的表面质量和内在强度。使用特殊的检测装置进行测量、采用方齿槽+辅助定位方式,仅仅加工了一个中孔,就保证了缆车转环的制造精度。     

A Novel Spatial Analysis Method for Remote Sensing Image Classification

A new and efficient classification model is introduced in this paper. The proposed model enjoys the information of null space of within-class and range space of within-class. And the proposed model aims at defining a reliable spatial analysis criterion for the remote sensing image, taking advantage of the differences in different areas. Finally, by incorporating fisher linear discriminant analysis and support vector machine (or K-nearest neighbor) classifier among image pixels, the model obtained more accurate classification results.     

The Synthesis and Characterization of Cerium Carbonate Hydroxide Nanorods as an Anode for Lithium-Ion Batteries

Nanorods cerium carbonate hydroxide, CeCO₃OH, was synthesized through a low-temperature reaction route. The data of x-ray diffraction and scanning electron microscopy revealed that the as-prepared samples were CeCO₃OH nanorods. The diameters of the nanorods were in the range of 50–100 nm, and the lengths were around 300–500 nm. As an anode of a lithium ion battery, the charge–discharge capacity, cyclability and lithium-ion diffusion kinetics of CeCO₃OH nanorods were investigated. The calculated lithium ion diffusion coefficient was 1.36 × 10^?19 cm² s^?1. The initial discharge capacity was about 621.6 mA h g^?1 at 0.2 mA cm^?2 in 0.05–2.5 V. After 100 cycles, the discharge capacity stabilized at about 362 mA h g^?1 and the Coulombic efficiency was nearly 98%, indicating the potential application in anodes of lithium-ion batteries.     

舞钢电渣重熔炉加料机电气控制系统的改造实践

通过PLC、Win CC和IND331称重终端的综合应用,舞钢针对电渣重熔炉加料机电控系统进行改造,降低了设备故障率,提高了加料精度。     

倍量光辐射柔光灯的研究与开发

本文论述了一款基于高斯成像理论与非成像光学软件技术结合的具有与普通柔光灯相比光能辐射加倍的节能型"倍量光辐射柔光灯"的研究与设计方法。     

含Laves相TiCr2过共析钛铬合金的制备

通过非自耗磁控电弧炉熔铸和700℃,20h高温退火处理,制备出含铬18%～30%(质量分数)含Laves相TiCr2过共析钛铬合金,并研究其中的组织变化规律.研究结果表明,稳定化系数为2.57～4.62的过共析钛铬合金经过熔炼后,在随炉冷却的条件下得到的是单相β-Ti组织;铸态合金在700℃保温退火时,金属间化合物TiCr2不仅沿晶界生成并形成连续分布,还将在基体内部弥散析出;在随后的空冷过程中合金内局部会发生β-Ti→α-Ti+TiCr2共析分解.合金含铬量越高,在高温退火时析出的TiCr2量越多,粒径越大,合金的硬度也越高.电弧熔炼加上700℃,20 h高温退火是一种制备含Laves相过共析钛铬合金的可行工艺.     

氧化铋亚微米棒在水热条件下的可控生长研究(英文)

用水热法制备了单斜结构的氧化铋亚微米棒,而且通过控制硝酸铋的浓度和水热反应时间,能有效地控制氧化铋亚微米棒的直径和长径比。氧化铋亚微米棒的晶体结构、尺寸和形状用 X-射线衍射、扫描电子显微镜和透射电子显微镜进行了表征。研究发现:随着硝酸铋浓度的降低,氧化铋粒子的尺寸逐渐减小;随着反应时间的增加,氧化铋亚微米棒的直径和长度逐渐增加。此外,还讨论了氧化铋亚微米棒的形成机理。     

四频差动激光陀螺第二类色散平衡技术研究

磁效应误差是四频陀螺的一项重要误差源,而第二类色散平衡能从根源上减小磁敏感度.从近独立双陀螺模型出发,分析了第二类色散平衡的原理,设计了标定方案和更新算法,并搭建了实验系统.实验结果表明:采用稳光强技术有利于保证第二类色散平衡效果的稳定性.若结合200倍的磁屏蔽技术,第二类色散平衡标定后可使室温下四频陀螺的长期磁敏感度降低至0.0000975./h/Gauss;温度从-40℃～60℃之间,磁敏感度变化约0.00645./h/Gauss.实验验证了更新算法的可行性和所受的时间制约.     

Microbial transformation of androst‐4‐ene‐3, 17‐dione by Bordetella sp. B4 CGMCC 2229

BACKGROUND: Microbial transformation of steroids has attracted widespread attention, especially the transformation of those steroids synthesized with difficulty by chemical methods. In this study, microbial transformation of androst‐4‐ene‐3, 17‐dione (AD) by Bordetella sp. B4 was investigated, and the effect of temperature on transformation was studied. RESULTS: Three metabolites were purified by preparative TLC and HPLC, and identified as androsta‐1,4‐diene‐3,17‐dione (ADD), 9α‐hydroxyandrost‐4‐ene‐3, 17‐dione (9α‐OH‐AD), and 3‐hydroxy‐9, 10‐secoandrost‐1, 3, 5‐triene‐9, 17‐dione (3‐OH‐SATD) by nuclear magnetic resonance imaging (NMR), Fourier transform infrared spectroscopy (FTIR) and mass spectroscopy (MS). It was first reported that the genus of Bordetella has the capability of AD degradation. Microbial transformation of AD was performed at 30 °C, 37 °C, 40 °C and 45 °C. The 9α‐OH‐AD yield reached a maximum within 16 h when the strain was cultivated in media with AD as sole carbon at 37 °C. Surprisingly, ADD was produced by the strain cultivated at 40 °C but not at 37 °C, which was different from previous reports. It was deduced that the alcohol dehydrogenase that catalyzed the transformation of AD to ADD may be temperature sensitive. CONCLUSION: Androst‐4‐ene‐3,17‐dione was converted into 9α‐hydroxyandrost‐4‐ene‐3, 17‐dione and other metabolites rapidly by Bordetella sp. B4. It is anticipated that the strain Bordetella sp. B4 CGMCC 2229 can be used in the steroids industry. Copyright © 2009 Society of Chemical Industry     

城市化中后期城市中心的功能转型与空间重构——以常州旧城中心区为例

中国城市建设已经进入一个以快速发展与结构性调整并行互动为特征的城市化中后期阶段.城市社会经济已进入产业布局、类型、结构的重构和转型的实质性实施阶段,如何在新的发展条件下进行城市中心的功能与结构调整成为当前中国城市发展的重要主题.以常州旧城中心区为例,就中心地区功能转型、土地资源再生和旧城整体机能提升等问题展开讨论.