本试验比较了立砖地面与黄土地面运动场的饲养效果。结果显示，立砖地面运动场组奶牛的产奶量、泌乳持续力、高峰奶量都优于黄土地面运动场组，而体细胞数与体细胞线性评分明显低于黄土地面运动场组。试验结果表明，立砖地面的运动场舒适度明显优于黄土地面，对于奶牛生产性能的发挥与奶牛福利的提高更有优势。

Comparisons between the brick and soil ground in playground, the results of experiment showed milk production, milk persistency and peak milk of dairy cattle in the brick ground group is better than that of soil ground group. The SCC and LSCC in the brick ground group are lower compared with soil ground group. So the brick ground is more comfortable for dairy cattle, and can improve production performance and welfare of dairy cattle compare to soil ground.

航空相机执行机构的核心是像面扫描系统，要求高扫描精度、高扫描频率、体积小、结构简单，否则成像模糊、成像帧频低。国内外低精度的扫描机构采用旋转电机外加凸轮、齿轮、涡轮蜗杆等机械传动机构将旋转运动变为直线扫描运动，搭建的像面扫描系统体积大、结构复杂、智能化程度低与未来相机的发展趋势不吻合。设计的新型高频高速像面扫描结构，直线往复扫描运动执行机构选用音圈电机，像面扫描方式为矩形扫描方式。为满足指标要求，采用音圈电机持续力控制和滞后超前控制相结合的控制策略。实验表明，线速度103 mm/s，线性行程0.2 mm时，实现了扫描频率15 Hz，稳速精度±0.2%，满足了工程要求。

Image scanning system is the core sub-system of aerial camera. It requires high scanning accuracy, high scanning frequency, small size, simple structure, otherwise, the image is blur and image frame rate is low. Low-precision scanning mechanism abroad changes the rotary motion into linear scanning movement using rotary motor plus cams, gears, worm and other mechanical transmission mechanism. The image plane scanning system is bulky, has complex structure and low intelligence. It does not match the trends of future camera. Voice coil motor is chosen to produce linear reciprocating motion for the new design high-frequency and high-speed image scanning structure. Image scanning mode was rectangular scanning. In order to achieve high control accuracy and high repetition rate, intelligent control method with continuous force control of VCM was introduced. Image scanning frequency can reach 15 Hz, scanning speed accuracy can be in 0.2%, the linear travel was at least 0.2 mm, linear scanning

从图书馆服务的"连续性"角度提出图书馆"持续服务"原则,阐释"持续服务"的概念、意义,从图书馆的社会职能角度分析其要点,指出不同类型图书馆的持续服务重点以及持续服务对图书馆的要求,丰富图书馆读者服务理论的研究,为图书馆开展"持续服务"鼓与呼。

From the point of“continuity” in library services, this paper puts forward “continuous service” principle and expands the concept and significance.By analyzing the main point from the angle of the library social role this paper discusses the keys and demands of continuous services in libraries of different types that enrich the theoretical research in library services and pro-mote library continuous service.

近年来，随着道路情况的进一步改善，商用汽车不断向着重型化、高速化发展。持续制动系统可以在不使用传统制动系统的情况下，实现能量转化，为汽车提供持续的制动效果。避免由于持续使用传统摩擦式制动装置而引起的热衰退，提高汽车的安全性。本文通过分析国内外对于持续制动系统的研究，提出使用计算机模拟的方法来分析持续制动系统和车辆匹配的问题。选择合适的程序平台，进一步开发后得到了一套商用汽车持续制动模拟计算系统。

In recent years, with the future improvement of road conditions, commercial vehicle develops towards heavy type and high speed. Auxiliary brake system can provide continuous braking power for vehicle by transforming energy without traditional braking system, that avoids heat-fading accused by traditional friction braking device. And the vehicle is guaranteed. Studies about auxiliary braking system prove computer simulation is effective way to analyses the effect of auxiliary braking system and vehicle matching. Then choosing property application platform, I develops a system for simulating commercial vehicle longtime braking.

目的观察持续封闭负压引流治疗大面积皮肤剥脱损伤的临床疗效.方法使用持续封闭负压引流对21例大面积皮肤剥脱损伤患者进行治疗.结果21例患者大面积皮肤剥脱损伤全部治愈.结论持续封闭负压引流治疗大面积皮肤剥脱损伤经济、简单、有效,保持持续负压引流有效是治疗的关键.

Objective To observe the negative pressure drainage for closed treatment of large area skin stripped the clinical efficacy of damage. Methods Using continuous closed negative pressure drainage in 21 patients with large areas of skin stripped injury patients for treatment. Results Of 21 patients with large areas of skin stripped damage all cured. Conclusion For the seal negative pressure drainage treatment of large area skin stripped damage economic, simple, effective and keep continues the negative pressure drainage effective treatment is the key.