回流

Methods:The most appropriate technology was screened based on the comparative study among the technology of ethanol circumfluence,ultrasonic extraction,water warm immersion and water decoction,with the concentration of menstruum, volume and extracting time as the evaluating factors,on the basis of orthogonal design.

对比乙醇回流、温浸、超声及水煎等提取工艺，以溶媒浓度、用量、提取时间为研究因素，经正交设计进行提取工艺条件的优选。结果：最佳提取工艺路线为10倍量75%乙醇回流提取1次，提取时间为1.5 h。

The unit of 1000t/a methylal synthesis by fluidized catalytic distillation was designed according to the results of equilibrium stage simulation, together with the consideration of the existence of plate efficiency and utilization ratio of catalyst.

在模拟过程中，探讨了塔板数、空时、回流比等对催化精馏效果的影响，分析了各因素对催化精馏的耦合影响关系，得到了较适宜的理论塔板数、空时和回流比，为本体系的工业性试验用催化精馏塔设计提供了依据。

Is a company specializing in high-precision reflow manufacturing company, owns the world's cutting-edge reflow lead-free technology, to provide first-class technology and products.

是一家专门从事高精密度回流焊制造公司，拥有世界上尖端回流焊无铅技术，为企业提供一流的技术和产品。

Parameters of reflow oven have distinct effect on ref low profile and its key specifications.

对回流温度曲线关键指标的影响，为回流焊接工艺参数的设置和调整提供指导。

Methods Compared with the ultrasonic extraction and the refluent extraction experiment,colorimetric analysis was used to measure the content of active ingredients.

方法比较超声提取和回流提取实验，用比色法测定有效成分；采用回流提取正交实验，并对实验数据经不同的计算和分析比较优选螃蟹脚的提取工艺条件。

The flow characteristics of surface singular point, seperation lines, re-adhesional lines, low speed back-flow area of the impeller and back-flow area at the impellor's inlet were revealed.

揭示了额定流量与小流量时叶轮的表面奇点、分离线、再附着线、低速回流区和进口回流等流动特征，进而提出了改进螺旋离心泵设计方法与结构的设想。

By synthetically analysizing the physical and chemical properties of all components and particle size, the content of F2641 in the JOB-iC is determined by gravimetric analysis after F2641 is seperated from HMX,TATB and PNP through ? alkali reflux. Determination conditions is set as follows the sample is boilingly refluxed for six hour in a constant temperature bath after adding lOOm! 8.0 ?? 0.1% NaOH. The solvent DMF saturated by TATB is used for extracting HMX,F21 and PNP from the sample and TATB is seperated by crucible filter G4. The mass precent of TATB is determined by extraction fractionation. The mass percent of PNP is measured by multiwavlength linear regression ultraviolet spectrophotometry. The testing conditions are set as follows:multiwavlength constitution: X=267nxn, 275nm, 283nm, 29mm, 299nm,the application scope of the Lambert-Beer law: the concentration of PNP is O.005?0.O25mgIml, the concentration of HMX is 0.060.3Omg/ml,absorption coefficents of PNP and HMX are solved by the slope of linear regression curve of absorbency- concentration of standard solution of PNP and HMIX for measuring wavelengthes,on the basis of the Lanibert-Beer law and absorbancy additivity principle, the slope of linear regression curve of A/E(1) and E1 of PNP and HMX solution is regarded as the concentration of PNP in the solution.

根据传爆药中各组分的物理、化学性质及主体炸药的粒度大小，进行综合分析，确定了采用碱回流重量法测定JOB-1C 中F_(2641)的含量，测定条件：加入100ml浓度为8.0±0.1％的氢氧化钠，在恒温水浴中煮沸回流6h；采用溶剂萃取法测定JOB-1C中TATB的含量，选择TATB饱和的二甲基甲酰胺为萃取溶剂，用G4坩埚式过虑器进行萃取分离；采用多波长线性回归紫外分光光度法测定JOB-1C中PNP的含量，通过实验确定了多波长组合：λ=267nm，275nm，283nm，291nm，299nm；朗波—比耳定律的适用范围为PNP浓度：0.005～0.025mg/ml，HMX浓度：0.06～0.30mg/ml；在测定波长下，对PNP、HMX标准溶液的吸光度—浓度进行线性回归，由回归曲线的斜率得出PNP、HMX的吸收系数；根据朗波—比耳定律和吸光度加和性原理，在测定波长下，对PNP、HMX 两组分混合溶液A_i/E_HMX(i与E_PNP(i/E_HMX(i进行线性回归，回归曲线的斜率即为混合溶液中PNP的浓度。

About four a-Clock in the Evening, being then within about a League of the Island, I found the Point of the Rocks which occasioned this Disaster, stretching out as is describ'd before to the Southward, and casting off the Current more Southwardly, had of Course made another Eddy to the North, and this I found very strong, but not directly setting the Way my Course lay which was due West, but almost full North.

大约下午四点钟，在离海岛不到三海里的地方，我看到了伸向南方的岬角，这一点我前面也已提到过。正是这堆礁石引发了这次祸端。岬角把急流进一步向南方逼去，同时又分出一股回流向北方流去。这股回流流得很急，一直向正北。这不是我要航行的方向，我的航线是要往西走。

WEEE and RoHS was put out in 2003. In order to meet that ,the encapsulation of IC must adopt the technology of lead free. So that Epoxy molding compound must be no stibium and no halogen, and high reliability under the condition of high temperature.

2003年WEEE、RoHS法规的颁布，对于IC封装过程而言，在回流焊过程中要避免使用铅焊接，对于塑封料而言则要无卤无锑阻燃，且要满足较高回流温度条件的耐焊性考核。

WEEE and RoHS was put out in 2003. In order to meet the requirment of the WEEE and RoHs ,the encapsulation of IC must adopt the technology of lead free. Epoxy molding compound should be no stibium and no halogen, and have high reliability under the condition of high temperature.

2003年WEEE、RoHS法规的颁布，对于IC封装过程而言，在回流焊过程中要避免使用铅焊接，对于塑封料而言则要无卤无锑阻燃，且要满足较高回流温度条件的耐焊性考核。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。