换单

问题的某些方面已为人们所熟知巨型美国石油追踪基金uso的规模已经如此巨大，以至于当该基金对其优先期货合同的投资进行换单展期时，会导致市场主体出现剧烈波动。

Some parts of the problem are well known the huge US oil Tracker Fund USO is now so big that when it rolls over its investment in the underlying futures contracts it causes the main market to move violently .

石垣港换单简介及操船

Introduce the change document of Ishigaki Port and ships handling

开槽、压线实现同步调，节省换单时间。

Slotted synchronized adjustments on the line and save time .

定长、色标跟踪横切、自动换单、选择换单；

Fixed-length or color code tracing cut , automatic change or select order ;

支持生管输单和换单。

Support production management input order and order changed .

与高、中速瓦楞纸板生产线配套，全电脑控制，高速换单，高精度分切各种规格的纸板。

Get in high or mid-speed corrugated line for changing over high speed and slitting or various boards high precision with CNC system .

触摸屏和电动按钮多重控制，可储存订单，换单快捷、调整方便。

Computerized control and monitor system will provide purchase or job order memory and quick change by touching screen and control button when necessary .

介绍了中冷器抽换散热单节的氩弧焊接工艺，分析了中冷器抽换散热单节的焊接特点以及焊接性。

The argon arc welding process after replacement of intercooler cooling section was presented . The welding feature and weldability were analyzed .

对上述积分方程进行数值求解并进行相应的LAPLACE逆变换即可得单桩在水平力作用下剪力、弯矩、桩轴线的位移以及桩侧孔压在任意时刻的值。

The numerical solution of the integral equation and the corresponding numerical inverse LAPLACE transforms method give the values of shear force , the moment , the displacement of the pile and the pore pressure along the sides of the pile at arbitrary time .

本文讨论了在传热计算中螺旋板换热器与单壳程、单管程列管式换热器的差异。

The difference of heat transfer calculation between spiral plate heat exchanger and single shell and tube heat exchange is discussed in the article .

对化工过程系统的换热网络和单体设备进行用能诊断、应用高效换热设备和先进的余热回收节能技术、优化换热网络是化工过程系统节能行之有效的途径。

The energy consumption analysis of individual equipment and heat exchanger networks , application of high-efficiency heat exchangers and advanced surplus heat recovery technology and optimization of heat exchanger networks are effective and dependable ways for energy-saving of chemical process system .

首先给出了地源热泵系统各部件建模方面的进展，包括竖直埋管地热换热器、单井循环系统以及在地源热泵混合系统中采用的几种辅助散热装置。

First , developments related to modeling of components of the Ground Source Heat Pump ( GSHP ) system are presented vertical ground loop heat exchanger , water source heat pump , standing column well , and several types of supplemental heat rejecters used in hybrid GSHP systems .

主要研究结论如下：1、同样钻孔深度时螺旋管换热器的换热性能优于单U型管。

Some conclusions are stated below : 1 . When the depth of bulk keeps the same , the total amount of heat exchange in spiral pipe is superior to that in u-pipe heat exchanger .

基于换热网络模拟技术、换热器单台优选技术以及夹点技术原理对现有换热网络实施瓶颈分析，实现以最小投资和最小工程量完成现有换热网络的改造。

Analysis of the bottleneck in HEN based on simulation technology of HEN , optimization technology of single heat exchanger and the principle of pinch technology have been executed to realize the revamping of HEN with minimum investment and engineering quantity .

Re数较小时，空气侧平均换热系数随管排数的增加依次减小；Re数较大时，多排管的空气侧换热系数大于单排管的空气侧换热系数。

Heat transfer coefficient of the air side reduces along with the increase of tube row number when Reynolds number is low . Heat transfer coefficient of multi-tube rows is larger than that of single tube row when Reynolds number is high .

以单位井深换热量为评价指标对不同埋管方式的换热性能进行分析比较，得出排热和取热工况下，双U型埋管单位井深换热量均高于单U型。

And analysis and comparison between two kinds of heat exchangers were implemented with the evaluation standard of heat exchange quantity per well depth . The result shows that the heat exchange quantity of double U shaped is more than that of single U shaped under heating and cooling conditions .