The Junkers Jumo 004 was the world's first production turbojet engine in operational use, and the first successful axial compressor turbojet engine.

Mar 31, 2014 · Virtually all low- or zero-residue "no-clean" solder pastes and fluxes have little or no rosin or resin. So, if you are a paste or flux manufacturer and you are trying to classify your rosin/resin free no-clean material with J-STD's definitions, which designation do you choose?

1.1 Scope This standard prescribes general requirements for the classification and characterization of fluxes for high qual-ity solder interconnections. This standard may be used for quality control and procurement purposes.

Jan 18, 2025 · VPN or proxy connections might prevent your device from contacting the update servers. Here are some things you can try: Basic checks: Make sure your iPhone is connected to a stable Wi-Fi network. A weak or intermittent connection can cause update issues. Ensure your iPhone has enough storage space.

On March 15, 1942, a Junkers Jumo 004 prototype was tested on a Messerschmitt Bf 110 making it the world’s first successful axial-flow turbojet engine.

Designed by Dr. Anselm Franz, the Junkers Jumo 004 was the world’s first mass-produced, operational turbojet engine. It was also the first turbojet in the world with axial-flow compressors, afterburning, and a variable area exhaust nozzle.

Jul 23, 2013 · The current version of IPC J-STD-004 is revision B, often referred to as J-STD-004B. Interestingly, all previous revisions remain useable. Let’s explore this interesting situation.

本标准可用于助焊剂的质量控制和采购用途。 1.2目的本标准的目的是对印制电路板组件中电子装联所用的锡/铅和无铅焊接助焊剂材料进行分类和描述。 这些焊接助焊剂材料包括:液态助焊剂、膏状助焊剂、焊膏、外涂助焊剂以及含助焊剂芯的焊丝和预成形焊料。 本标准无意排除任何可接受的助焊剂或焊接辅助材料;但是这些材料必须能够形成所期望的电气和电子装联。 助焊剂固体中的卤化物重量百分比<0.05% ,可称为无卤助焊剂。 可采用卤化物定量法测定卤化物的含量(见附录. …

This paper describes the pioneering work of Anslem Franz who, while working for the Junkers Engine company in Germany designed and made operational the world’s first production jet engine the Junkers Jumo 004 which was the powerplant for the …

Jul 25, 2015 · The production Junkers Jumo 004B-1 and the Jumo 004B-4 turbines and stator blades used an austinitic 'stainless steel' like steel alloy called tinadur or an concurrently used alternative called cromadur.