White fuming nitric acid
Multi tool use
White fuming nitric acid (WFNA) is a storable liquid oxidizer used with kerosene and hydrazine rocket fuel. It consists of nearly pure nitric acid (HNO3). WFNA is commonly specified as containing no more than 2% water and less than 0.5% dissolved nitrogen dioxide or dinitrogen tetroxide.
WFNA was sometimes used with an inhibitor compound to reduce corrosiveness, often hydrogen fluoride. Without inhibitors, WFNA will corrode nearly all structural metals. Inhibited WFNA is often called IWFNA. The hydrogen fluoride addition causes formation of protective layer of fluoride on the metal surfaces.
WFNA as an oxidizer has somewhat less performance than red fuming nitric acid (RFNA) but is considerably safer (though extremely corrosive), as it has little to no dissolved nitrogen tetroxide, which is an extremely toxic and volatile chemical. If not inhibited, it will form nitrogen tetroxide on contact with most metals and some organic materials. RFNA can be converted from WFNA by simply leaving the RFNA out in low temperature for a couple of hours.
WFNA is also used in the manufacture of nitroglycerin, an explosive, by mixing it with concentrated sulfuric acid to produce the nitro group ester, and then by the slow addition of glycerol. This has now mostly been replaced by the less expensive procedure that uses a nearly 1:1 solution of oleum and azeotropic nitric acid (70%).
WFNA and IWFNA are hypergolic with a long list of other propellants, including: UDMH, hydrazine, furfuryl alcohol, and aniline.
External links
- National Pollutant Inventory – Nitric Acid Fact Sheet
- 2013/2014 data within Australia - Nitric acid from All Sources
gOoUPmXCuWEB0ClcGO,nnCI08YPuIx1jzaNF0 JcNrKkexmVP
這個網誌中的熱門文章
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
0
I'm trying to build a Chat app UI, the idea of the Layout was pretty simple: When the input bar is focused, keyboard show up and "push" up the chat bar, as it's a grid, the ListView will resize to fit the screen: I update the input bar's margin to "push" it up: NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey)); CGSize keyboardSize = result.RectangleFValue.Size; if (Element != null){ Element.Margin = new Thickness(0, 0, 0,keyboardSize.Height); //push the entry up to keyboard height when keyboard is activated } And this is ...
MGP Nordic Also known as Melodi Grand Prix Nordic Genre Song contest Created by DR Country of origin Denmark No. of episodes 5 contests Production Production location(s) Scandinavia Running time Various Distributor Nordvision Release Original network DR, NRK, SVT (2002–09) Yle Fem (2007–09) Original release 27 April 2002 ( 2002-04-27 ) – 28 November 2009 ( 2009-11-28 ) Chronology Preceded by De unges Melodi Grand Prix Related shows Dansk Melodi Grand Prix Junior Eurovision Song Contest MGP Nordic ( Melodi Grand Prix Nordic ) was a Scandinavian song contest for children aged 8 to 15, organized by DR, NRK, SVT and Yle through Yle Fem. It originated as a 2000 spin-off of Denmark's Eurovision Song Contest national final known as De unges Melodi Grand Prix , but expanded to become MGP Nordic in 2002 with the addition of Norway and Sweden. Contents 1 History 2 National selections 3 List of contests 4 ...
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
2
Can someone explain to me how to implement the post-redirect-get pattern in Spring WebFlux and Thymeleaf? What subscribes on the database save method? @GetMapping("/register") public String showRegisterForm(Model model) { model.addAttribute("user", new User()); return "register"; } @PostMapping public String processRegisterForm(@Valid User user, BindingResult bindingResult) { if (bindingResult.hasErrors()) { return "register"; } else { userRepository.save(user); //what subscribes on this? //how to redirect on e.g. "/login"? ...
