混合动力汽车混合度设计方法研究

提出了并联型混合动力汽车的混合度设计方法,重点讨论混合度设计的约束条件、边值条件及其计算方法。并结合实例说明该混合度的设计方法可合理、有效地确定动力源的功率参数。     

实用型FD—2风力提水机组的研制

描述了FD-2风力提水机组的研制过程。该机组采用玻璃钢复合材料作为低速风力机的风轮叶片,安全系统由侧后翼调速调向机构组成,与风力机配套的是手动泵。文中还给出了机组的现场生产考核试验结果。     

汽车侧面碰撞有限元分析

首先根据现有的某车型,建立汽车车身模型。然后根据模拟仿真的要求,划分网格和设置边界条件。最后根据相关碰撞法规要求,结合企业及行业设计标准,进行汽车侧面碰撞模拟仿真。根据仿真结果,有些内容不符合碰撞法规要求,并提出对汽车车身部分进行加强和改进。     

儿童约束系统侧面碰撞台车试验方法对比分析

详细介绍澳洲、欧洲、美国科研机构相关的测试及评价方法。通过对比分析其中的异同点、侧重点,借鉴吸收各国动态试验评价方法的优点,以获得一种更具科学性、有效性和稳定性的儿童约束系统侧碰台车试验方法,为我国开展评估儿童约束系统在车辆侧面碰撞事故中的保护性能、制定相关标准法规提供参考。     

渝湛高速(广东段)边坡早期树林化试验分析

随着国民经济的发展,高速公路边坡绿化与当地环境相协调越来越受到重视,为使渝湛高速(广东段)公路边坡绿化达到早期树林化,本文采用在边坡铺二维网、三维网、椰丝毯以及采用客土喷播、灌草混播等试验,结果表明:铺椰丝毯能够使公路边坡达到早期树林化。     

促进桑树侧芽萌发的刻芽技术研究

研究了刻芽技术中切口的长度、深度及切口与所刻芽之间的距离对芽发育的影响。切口的长度与芽距为 2∶1时 ,刻芽效果较好 ;切口的长度每增加 10～ 15mm ,切口的深度应相应地减少一个水平 ;芽距每增加 5mm左右 ,切口深度也应增加一个水平。按切口长度为 2 0mm ,芽距为 10mm ,切口深度为轻伤木质部刻芽 ,当年夏秋季产叶量提高 36 9% ,全年产叶量提高 2 4 5 % ,第 2年春季产叶量提高 8 7%。     

Flow through sharp-crested rectangular side orifices under free flow condition in open channels

Side orifices are widely used in irrigation and environmental engineering to spill or divert water from a channel. Flow characteristic of sharp-crested rectangular orifices under free flow condition in open channels is studied in the present paper. Existing discharge equations are checked for their accuracy using the data collected in the present study and available data in the literature and a new discharge equation has been proposed. The coefficient of discharge mainly depends on the approach flow Froude number and ratio of the size of orifice and bed width of the channel. Relationships for the coefficient of discharge, treating the orifice as large and small were developed. The computed discharges using these relationships were within ±5% of the observed ones. Measurement of three-dimensional velocities and visualisation of streamlines in a horizontal plane at the centerline of the orifice indicates that for the flow of low Froude number, almost all the streamlines divert towards the orifice. However, in the case of high Froude number flows, only those streamlines which are close to the side orifice are diverted towards the orifice. The opposite side of the boundary has significant effect on the diverted discharge of low Froude number compared to the flow of high Froude number. Circular orifice has been found to be more efficient compared to the rectangular orifice of the same opening area.     

梯弧形明渠及其设计方法

本文讨论了梯弧形明渠输水断面的特点,导出了梯弧形水力最佳断面的几何尺寸及水力要素的计算式,论证了梯弧形比工程中常用的梯形断面具有:较好的水力经济性,更大的边坡稳定性及更小的水流冲淤性等优点,值得在工程实践中推广使用。文中还编制了不同边坡系数(m)值时,设计计算梯弧形水力最佳断面尺寸的系数表,使运算简捷方便。     

Field Trial Validation of the Efficacy and Acceptability of Firocoxib,a Highly Selective Cox-2 Inhibitor,in a Group of 96 Lame Horses

The objective was to generate evidence for clinical efficacy and acceptability of a second generation coxib, firocoxib, administered orally for 14 days to lame horses under field conditions compared with a classic nonsteroidal anti-inflammatory drug, vedaprofen, in a prospective, randomized, controlled, double-blinded, multicenter field trial. Ninety-six client-owned horses with American Association of Equine Practitioners score of at least grade 3 lameness or grade 2 lameness plus at least a score of 2 for either pain on palpation, range of motion, or joint swelling were analyzed. Horses were administered 0.1 mg/kg firocoxib orally at 24 hour intervals (n = 48) or 1.0 mg/kg vedaprofen paste at 12 hour intervals for 14 days (single loading dose of 2.0 mg/kg vedaprofen) (n = 48). Physical examinations and lameness evaluations were conducted on Day 1 (V1, before treatment) and on Days 7 (V2) and 14 (V3). Blood chemistry and hematology profiles were also evaluated. With regard to the primary variable, clinical improvement, 83% of the firocoxib-treated horses improved at V3 compared with 65% of vedaprofen-treated horses improved meeting the criteria defined to demonstrate noninferiority of firocoxib to vedaprofen. Health and behavioral abnormalities for side effect detection occurred at the rate of 2% (1 horse) and 8% (4 horses) for firocoxib- and vedaprofen-treated horses, respectively. Changes in hematology and blood chemistry values from V1 to V3 were not significantly different between treatment groups. Firocoxib, formulated as an oral paste was highly effective, well tolerated, and acceptable for the control of pain and inflammation associated with lameness in horses under field conditions.     

节约型生态城市园林建设技术探讨

为应对日益恶劣的全球性气候变化和频发的自然与人为灾害,以及国家建设节约型社会的发展目标和措施,本文立足风景园林规划设计的实践和应用,提出在具体的实践操作中践行节约生态技术和理念,并就节约型生态园林城市建设的雨水收集、群落生态设计和边坡生态营建等节约型生态技术和发展趋势进行了探讨。