东京中心城区的规划历程及其现状——探索迈向成熟都市的阶梯

在梳理东京都城市中心的形成以及城市规划史的基础上,通过选取两大重要的中心街区(丸之内办公街区、银座商业街区)作为案例,进一步剖析近代东京中心城区的形成,以及此后逐步迈向地域主导的规划方式的过程。其中特别着重考察在中心城区形成、发展、更新的过程中将承载了各个历史阶段记忆的街区特征(基因)传承下来并延续到未来的探索和努力。     

郊居离学背景下乡镇小学学生通学出行特征研究——以南京市江宁区秣陵中心小学为例

在城乡统筹背景下,“撤点并校”政策的落实使得乡镇中心学校学生居住地与上学地距离较远——“郊居离学、通学难”现象日益突出。本研究以南京市江宁区秣陵乡镇中心小学为调研对象,在统计分析学生居住地—上学地空间分布、通学出行特征等综合信息基础上,对远距离上学学生的主导交通方式——校车的路线、通学时间、出行需求及意愿进行了剖析,并对校车与其他各出行方式的上学优劣势进行了比较。最后根据凋研结果,提出了优化学生通学出行方式的相应战略与措施,提高了乡镇学生就学可达性。     

Combination of supercritical fluid extraction with high-speed countercurrent chromatography for extraction and isolation of ethyl p-methoxycinnamate and ethyl cinnamate from Kaempferia galanga L.

Supercritical fluid extraction (SFE) with high-speed countercurrent chromatography (HSCCC) was successfully used for the extraction and isolation of ethyl p-methoxycinnamate (EPMC) and ethyl cinnamate (EC) from Kaempferia galanga L. The SFE parameters including extraction temperature, extraction pressure and entrainer volume were optimized by central composite design (CCD). Then the crude extract was separated by HSCCC with a two-phase solvent system composed of n-hexane:ethyl acetate:methanol:water (7:3:8:2, v/v/v/v) in one-step within 60 min. As a result, 13 mg of EPMC and 2 mg of EC were isolated from 100 mg of crude extract with purities of 98.4% and 98.1%, as determined by HPLC. The structural identification was carried out by UV, MS and NMR spectra.     

Characterization of Crude and Partially Purified Lipase from Geotrichum candidum Obtained with Different Nitrogen Sources

Lipases from Geotrichum candidum were produced in two different medium: A = 12 % (w/v) clarified corn steep liquor (CCSL) + 0.6 % (w/v) soybean oil (SO) and B = 3.5 % (w/v) yeast hydrolysate (YH) + 0.7 % (w/v) SO. Lipases were partially purified from both media by hydrophobic interaction chromatography using 3.0 mol L^?1 of NaCl as mobile phase, and they were characterized in the crude and partially purified forms. The recovery of lipase activity from CCSL and YH via HIC were 96 and 94.3 %, and the purification factors were 44.3 and 86.7‐fold, respectively. All evaluated lipases had similar optimum pH (7.0–7.7), but, for the CCSL crude lipase, optimum temperature (47 °C) was 10 °C higher than others lipases evaluated. CCSL crude lipase possessed a higher thermo stability than YH crude lipase, e.g., at 37 °C (pH 7.0) the half‐life of CCSL crude lipase was 19.25 h and at pH 8.0 (30 °C) the half‐life was 48 h, which are five and ten times higher than with YH crude lipase, respectively. On the other hand, the YH crude lipase possessed a higher catalytic constant (k_cat = 2.3 min^?1) but with almost the same catalytic efficiency (K_m/k_cat = 32.12 mg mL min^?1) in relation to CCSL crude lipase. The lipases differ in biocatalytic properties between substrates, suggesting that the two lipases can be employed for different applications.     

自动上粕机液压系统设计

介绍自动上粕机液压系统的主要功能和设计原理。在分析自动上粕机液压系统动作和功能的基础上,提出该液压系统的设计方案,详细阐述了液压系统回路设计过程以及工作原理。经实践测试:该液压系统工作运行平稳,各项性能可满足自动上粕机作业需求,具有良好的市场应用前景。     

基于MT的冀中台陷（京南段）西部Ⅲ级构造单元界限研究

太行山山前断裂是Ⅲ级构造单元太行山隆起与冀中台陷的边界,查明其具体位置对区域的深部热储调查评价具有重要意义。为此,本文在前期区域重力和航磁等物探工作的基础上开展大地电磁勘探工作。通过布设5条大地电磁剖面,实现了对Ⅲ级构造单元界限的详细勘探。通过对4000 m以浅地层进行反演解译,并结合区域重磁勘探成果及地质资料,确定了区域性断裂及其次生断裂的位置、产状、走向等,重新绘制了Ⅲ级构造单元界限。结果显示界限中段向东偏移2 km左右,南段和北段与原界限重合或小有差异。该结果与深地震反射剖面探测结果基本吻合。本文研究成果将对该区域地热勘探工作有一定的指导作用。     

华中电网电压等级的发展与展望

介绍了华中地区超高压大电网的发展历程、发展前景以及“十一五”期间的发展重点。     

PLC在中央空调控制系统中应用及常见故障检修

可编程控制器(PLC)控制系统具有工作稳定、可靠,便于维护,具有价格便宜、控制灵活方便等特点,被广泛应用于各行各业的自动控制系统中。介绍了可编程控制器的控制原理以及其在中央空调制冷系统控制中的应用,并对控制系统故障的检查与维修等相关技术进行了探讨。     

中外CBD研究分析与比较

从文献统计和综述的角度入手,通过样本数据特征和关注度图谱分析相结合的方法,对CBD的研究阶段进行了划分,对国内外关于CBD研究的特征、内涵、演变规律进行了研究.认为国外CBD研究的演变过程和动力机制与国内存在着较大差异,研究内容出现了同构性和异质性并存的特征,故须理性对待我国CBD的研究与实践探索.     

南京河西CBD生态规划的思考

该文首先回顾了经典CBD理论和国内外著名CBD的成功经验,然后结合南京河西CBD的实际情况及功能定位着重探讨了如何建设生态型的河西CBD,提出需要加强维护规划、完善相关法律法规、加快产业结构的升级和调整、创造浓厚的文化氛围、建成现代化的城市基础设施、保证环境保护系统的良好运转等一系列发展措施,并且从宏观方面对河西CBD的建设发展给出一些建议.