An overview of the present status and the future prospects are described. The important technique innovations and the progressive tendency on the regenerative refrigeration technology of the pulse tube, G-M, Stirling and Boreas refrigerators are summarized.

Since a nation even couldn't bear to hear them, they naturally died out in the boreas.

既然一个民族都不忍听闻，它们也就消失在朔风之中。

Seed Germination, Growth Characteristic and Nutritional Value of A New Vegetable, Borecole Kale

新型蔬菜羽衣甘蓝种子发芽及生长特性和营养价值

Study on Behavior of Side Resistance of Bored Pile in Shanghai

上海地区钻孔灌注桩桩侧摩阻力性状研究

Analysis of Causes of Common Problems of Bored Pile and Treating Methods

钻孔灌注桩常遇问题原因分析及处理方法

A New Method Used for Bored Pile End and Sides Grouting

钻孔灌注桩桩端桩侧压浆新工艺的应用

Design and application of protection wall of bored pile with steel structure

钢构工具式挖孔桩护壁的设计与应用

Key Construction Technology and Problem Treatment on Impact Bored Pile

冲击钻孔灌注桩施工要点及问题处理

Analysis and Treatment of Common Quality Problem for Bored Pile

湿作业成孔灌注桩常见质量问题分析及处理方法

Construction Technology and Quality Control Measures of Bored Pile Foundation

钻孔灌注桩基础施工技术及质量控制措施

Analysis on the Mechanism of the Post-grouting Technique for the Bored Pile Construction

钻孔灌注桩后压浆技术效果的机理分析

Gray Variable Method of Evaluation on Construction Quality of Super-length Bored Pile

超长钻孔灌注桩施工质量评价的灰色变权方法

Construction process of underwater bored concrete pile as well as points for attention in construction is briefly introduced. Based upon analysis of engineering quality problems frequently encountered in construction corresponding prevention and treatment measures are proposed in order to ensure trouble-free construction of bored concrete pile.

简述了水下浇筑混凝土的过程及注意要点，分析了水下浇筑混凝土过程中经常遇到的工程质量问题，并介绍了预防及处理措施，以保证钻孔灌注桩工程的顺利进行。

CZ-1200 percussion drill was developed to improve and perfect the performances and structures of CZ-22 cable percussion Rig used in diaphragm wall, bored pile and water well drilling engineering in China.

针对目前国内防渗墙、灌注桩桩孔施工及水井钻凿的主要设备CZ-22型钢绳冲击式钻机在使用过程中的一些不足之处，研制开发了CZ-1200型冲击钻机。

Analysis of water emitting from the top of bored cast-in-situ Pile as well as settlement

钻孔灌注桩桩顶冒水原因分析及处理

The results indicate that the bored pile works well and has high potential carrying capacity. Under the precondition of construction quality, we can shorten pile's length and reduce investment through the measurement of pile's axial force and pile's end resistance.

结果表明，黄土地区的钻孔灌注桩有较高的承载潜力和良好的工作性状，在保证施工质量的前提下，可借助桩身轴力传递和桩端阻力的量测，缩短桩长，节约投资。

Surface borehole diameter and casing diameter as well as characteristics of filling materials can be achieved by calculating the horizontal movement and vertical stain at different depths.

通过计算地表钻孔在不同深度的水平位移和垂直变形可确定钻孔直径和所需安设套管的直径及套管外充填材料的性能。

The system collects the magnetic memory signals liberated from the stress concentration zone of the in-use borehole casing pipe, judges fast and correctly the state of the zone.

该检测系统可根据在役套管的应力集中区所产生的磁记忆信号快速、准确地判断套管的应力集中区状况。

On the basis of the principle of casing actual strength more than salt bed creep collapse load in non-uniform load, the safety in borehole casing ability be ensured.

按照非均布载荷下套管实际强度大于盐岩层蠕变外挤载荷的原则，确保井内套管安全。

Application of Oil Industry Special Purposed Floating Hoop and Shoe on Coalmine Service Borehole Casing Lowering and Consolidation

石油专用浮箍浮鞋在煤矿服务钻孔下管和固井中的应用

Early diagnosis for the stress concentration zone of borehole casing pipe by metal magnetic memory and wavelet transform

磁记忆与小波变换相结合的井下套管应力集中早期诊断方法