投稿時間:2023-02-27 01:09:12 RSSフィード2023-02-27 01:00 分まとめ(12件)

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AWS	lambdaタグが付けられた新着投稿 - Qiita	CDK(Python)でコーディングしたAPIGateway×LambdaをSAMCLI Localで動作確認してからAWSにデプロイしてみた。	https://qiita.com/matsumikan/items/1f51e6ca40414851b205	apigateway	2023-02-27 00:43:25
Ruby	Rubyタグが付けられた新着投稿 - Qiita	Ruby on Rails チュートリアル　第2章	https://qiita.com/fuku_program/items/c19589767074d7a17791	rails	2023-02-27 00:00:53
AWS	AWSタグが付けられた新着投稿 - Qiita	CDK(Python)でコーディングしたAPIGateway×LambdaをSAMCLI Localで動作確認してからAWSにデプロイしてみた。	https://qiita.com/matsumikan/items/1f51e6ca40414851b205	apigateway	2023-02-27 00:43:25
GCP	gcpタグが付けられた新着投稿 - Qiita	GCPのCloud VPNでVPCの間をつなぐ	https://qiita.com/daredeshow/items/a5d306a962994fd8a4c6	cloudvpn	2023-02-27 00:51:37
Ruby	Railsタグが付けられた新着投稿 - Qiita	Ruby on Rails チュートリアル　第2章	https://qiita.com/fuku_program/items/c19589767074d7a17791	rails	2023-02-27 00:00:53
海外TECH	MakeUseOf	7 Ways to Fix the “Compressed (Zipped) Folder Is Invalid” Error on Windows	https://www.makeuseof.com/windows-compressed-zipped-folder-is-invalid-error-fix/	doesn	2023-02-26 15:16:16
海外TECH	DEV Community	What If You Would Marry a Programming Language	https://dev.to/perssondennis/what-if-you-would-marry-a-programming-language-30mf	What If You Would Marry a Programming LanguageWhat if programming languages were human and you could marry them What could you expect in relationships like that This is what I think it would be like to live with four of the most known programming languages In the KitchenJava A good baker following recipes in detail but will need an apron food processor colander steak hammer and a cork screw to even make a sandwich JavaScript JavaScript doesn t care if the only ingredients you have at home is chocolate sauce canned tuna and some potato peels from the sink it s fine to combine Python Python gladly accepts any meal request you have and lets C prepare it for you C C makes sure you have whatever utensil you may need but don t expect any help cooking the food And don t you dare buying meat that is already minced that s not why C bought you that meat grinder What s not to like Chocolate good Tuna good Potato peel In the BedroomJava Just bring the necessary tools and Java can run anywhere No need to keep it inside it works just as fine outside the windows JavaScript JavaScript doesn t understand the importance of foreplay it believes it can get you ready during the act and finish just in time Python Can probably give you what you want otherwise it works perfectly to invite a third party C Do I really need to say anything more than that C has made a great reputation from being quick First Meeting With FamilyJava Don t be fooled by your great connection with Java if your parents aren t the right types Java will refuse to meet them JavaScript Even though there are other ways JavaScript is most comfortable when meeting your family over the internet Python There s a great chance your parents will like Python Unfortunately there s a risk they may find Python being quite slow C There s no chance your parents will get C from start they will for sure be some misunderstandings React Anti Patterns and Best Practices Do s and Don ts Dennis Persson・Feb ・ min read react javascript webdev programming Mental ConnectionJava Old and reliable but quite boring You know Java is always there for you but can be rather grumpy if you don t follow its rules and conventions JavaScript Acceptive versatile and will always introduce you to new friends If you do something wrong JavaScript won t let you now you will have to find that out on your own Python Nice to communicate with easy to read and will always try to get rid of all the garbage in your life C If you want the smartest tool in the shed C is a good choice But don t complain if it doesn t listen to you it s probably your fault it s having memory leaks What About You What programming language would you marry What is so good with it Dennis PerssonFollow I m a former teacher writing articles about software development and everything around it My ambition is to provide people all around the world with free education and humorous reading	2023-02-26 15:38:50
Apple	AppleInsider - Frontpage News	Exploratory Design Group is Apple's secretive team working on glucose tech	https://appleinsider.com/articles/23/02/26/exploratory-design-group-is-apples-secretive-team-working-on-glucose-tech?utm_medium=rss	Exploratory Design Group is Apple x s secretive team working on glucose techA profile into Apple s Exploratory Design Group explains how teams work in secret on next generation technologies including the often rumored non invasive glucose monitor for the Apple Watch Apple Watch UltraApple operates numerous groups within its organization charged with developing new technologies and products that could eventually go on sale to the public in the future In a profile published on Sunday the hyper secretive Exploratory Design Group is detailed as a compact group that operates like a start up mini Apple in some ways Read more	2023-02-26 15:22:55
海外TECH	Engadget	Hitting the Books: Why America once leaded its gasoline	https://www.engadget.com/hitting-the-books-invention-and-innovation-vaclav-smil-mit-press-153005870.html?src=rss	Hitting the Books Why America once leaded its gasolineEngine knock wherein fuel ignites unevenly along the cylinder wall resulting in damaging percussive shockwaves is an issue that automakers have struggled to mitigate since the days of the Model T The industry s initial attempts to solve the problem ーnamely tetraethyl lead ーwere in hindsight a huge mistake having endumbened and stupefied an entire generation of Americans with their neurotoxic byproducts Dr Vaclav Smil Professor Emeritus at the University of Manitoba in Winnipeg examines the short sighted economic reasoning that lead to leaded gas rather than a nationwide network of ethanol stations in his new book Invention and Innovation A Brief History of Hype and Failure Lead gas is far from the only presumed advance to go over like a lead balloon Invention and Innovation is packed with tales of humanity s best intentioned most ill conceived and generally half cocked ideas ーfrom airships and hyperloops to DDT and CFCs nbsp MIT PressExcerpted from Invention and Innovation A Brief History of Hype and Failure by Professor Vaclav Smil Reprinted with permission from The MIT Press Copyright Just seven years later Henry Ford began to sell his Model T the first mass produced affordable and durable passenger car and in Charles Kettering who later played a key role in developing leaded gasoline designed the first practical electric starter which obviated dangerous hand cranking And although hard topped roads were still in short supply even in the eastern part of the US their construction began to accelerate with the country s paved highway length more than doubling between and No less important decades of crude oil discoveries accompanied by advances in refining provided the liquid fuels needed for the expansion of the new transportation and in Standard Oil of Indiana introduced William Burton s thermal cracking of crude oil the process that increased gasoline yield while reducing the share of volatile compounds that make up the bulk of natural gasolines But having more affordable and more reliable cars more paved roads and a dependable supply of appropriate fuel still left a problem inherent in the combustion cycle used by car engines the propensity to violent knocking pinging In a perfectly operating gasoline engine gas combustion is initiated solely by a timed spark at the top of the combustion chamber and the resulting flame front moves uniformly across the cylinder volume Knocking is caused by spontaneous ignitions small explosions mini detonations taking place in the remaining gases before they are reached by the flame front initiated by sparking Knocking creates high pressures up to MPa or nearly up to times the normal atmospheric level and the resulting shock waves traveling at speeds greater than sound vibrate the combustion chamber walls and produce the telling sounds of a knocking malfunctioning engine Knocking sounds alarming at any speed but when an engine operates at a high load it can be very destructive Severe knocking can cause brutal irreparable engine damage including cylinder head erosion broken piston rings and melted pistons and any knocking reduces an engine s efficiency and releases more pollutants in particular it results in higher nitrogen oxide emissions The capacity to resist knockingーthat is fuel s stabilityーis based on the pressure at which fuel will spontaneously ignite and has been universally measured in octane numbers which are usually displayed by filling stations in bold black numbers on a yellow background Octane CH is one of the alkanes hydrocarbons with the general formula CnHn that form anywhere between to percent of light crude oils and one of its isomers compounds with the same number of carbon and hydrogen atoms but with a different molecular structure trimethypentane iso octane was taken as the maximum percent on the octane rating scale because the compound completely prevents any knocking The higher the octane rating of gasoline the more resistant the fuel is to knocking and engines can operate more efficiently with higher compression ratios North American refiners now offer three octane grades regular gasoline midgrade fuel and premium fuel mixes During the first two decades of the twentieth century the earliest phase of automotive expansion there were three options to minimize or eliminate destructive knocking The first one was to keep the compression ratios of internal combustion engines relatively low below Ford s best selling Model T rolled out in had a compression ratio of The second one was to develop smaller but more efficient engines running on better fuel and the third one was to use additives that would prevent the uncontrolled ignition Keeping compression ratios low meant wasting fuel and the reduced engine efficiency was of a particular concern during the years of rapid post World War I economic expansion as rising car ownership of more powerful and more spacious cars led to concerns about the long term adequacy of domestic crude oil supplies and the growing dependence on imports Consequently additives offered the easiest way out they would allow using lower quality fuel in more powerful engines operating more efficiently with higher compression ratios During the first two decades of the twentieth century there was considerable interest in ethanol ethyl alcohol CHO or CHCHOH both as a car fuel and as a gasoline additive Numerous tests proved that engines using pure ethanol would never knock and ethanol blends with kerosene and gasoline were tried in Europe and in the US Ethanol s well known proponents included Alexander Graham Bell Elihu Thomson and Henry Ford although Ford did not as many sources erroneously claim design the Model T to run on ethanol or to be a dual fuel vehicle it was to be fueled by gasoline Charles Kettering considered it to be the fuel of the future But three disadvantages complicated ethanol s large scale adoption it was more expensive than gasoline it was not available in volumes sufficient to meet the rising demand for automotive fuel and increasing its supply even only if it were used as the dominant additive would have claimed significant shares of crop production At that time there were no affordable direct ways to produce the fuel on a large scale from abundant cellulosic waste such as wood or straw cellulose had first to be hydrolyzed by sulfuric acid and the resulting sugars were then fermented That is why the fuel ethanol was made mostly from the same food crops that were used to make in much smaller volumes alcohol for drinking and medicinal and industrial uses The search for a new effective additive began in in Charles Kettering s Dayton Research Laboratories with Thomas Midgley a young born in mechanical engineer in charge of this effort In July a report prepared in collaboration with the US Army and the US Bureau of Mines listed ethyl alcohol benzene and a cyclohexane as the compounds that did not produce any knocking in high compression engines In when Kettering was hired by GM to head its new research division he defined the challenge as one of averting a looming fuel shortage the US domestic crude oil supply was expected to be gone in fifteen years and “if we could successfully raise the compression of our motors we could double the mileage and thereby lengthen this period to years Kettering saw two routes toward that goal by using a high volume additive ethanol or as tests showed fuel with percent benzene that eliminated any knocking or a low percentage alternative akin to but better than the percent iodine solution that was accidentally discovered in to have the same effect In early Kettering learned about Victor Lehner s synthesis of selenium oxychloride at the University of Wisconsin Tests showed it to be a highly effective but as expected also a highly corrosive anti knocking compound but they led directly to considering compounds of other elements in group of the periodic table both diethyl selenide and diethyl telluride showed even better anti knocking properties but the latter compound was poisonous when inhaled or absorbed through skin and had a powerful garlicky smell Tetraethyl tin was the next compound found to be modestly effective and on December a solution of percent tetraethyl lead TEL ー CH Pb ーproduced no knock in the test engine and soon was found to be effective even when added in concentrations as low as percent by volume TEL was originally synthesized in Germany by Karl Jacob Löwig in and had no previous commercial use In January DuPont and Standard Oil of New Jersey were contracted to produce TEL and by February the new fuel with the additive mixed into the gasoline at pumps by means of simple devices called ethylizers became available to the public in a small number of filling stations Even as the commitment to TEL was going ahead Midgley and Kettering conceded that “unquestionably alcohol is the fuel of the future and estimates showed that a percent blend of ethanol and gasoline needed in could be supplied by using only about percent of the country s grain and sugar crops while providing an additional market for US farmers And during the interwar period many European and some tropical countries used blends of percent ethanol made from surplus food crops and paper mill wastes and gasoline admittedly for relatively small markets as the pre World War II ownership of family cars in Europe was only a fraction of the US mean Other known alternatives included vapor phase cracked refinery liquids benzene blends and gasoline from naphthenic crudes containing little or no wax Why did GM well aware of these realities decide not only to pursue just the TEL route but also to claim despite its own correct understanding that there were no available alternatives “So far as we know at the present time tetraethyl lead is the only material available which can bring about these results Several factors help to explain the choice The ethanol route would have required a mass scale development of a new industry dedicated to an automotive fuel additive that could not be controlled by GM Moreover as already noted the preferable option producing ethanol from cellulosic waste crop residues wood rather than from food crops was too expensive to be practical In fact the large scale production of cellulosic ethanol by new enzymatic conversions promised to be of epoch making importance in the twenty first century has failed its expectations and by high volume US production of ethanol used as an anti knocking additive continued to be based on fermenting corn in it claimed almost exactly one third of the country s corn harvest	2023-02-26 15:30:05
海外科学	NYT > Science	Ward Stone, Wildlife Coroner Who Warned Against PCBs, Dies at 84	https://www.nytimes.com/2023/02/26/science/ward-stone-dead.html	chemicals	2023-02-26 15:54:49
ニュース	BBC News - Home	Italy shipwreck: At least 58 migrants killed off Calabria coast	https://www.bbc.co.uk/news/world-europe-64776621?at_medium=RSS&at_campaign=KARANGA	resort	2023-02-26 15:22:34
ニュース	BBC News - Home	Tottenham Hotspur 2-0 Chelsea: Harry Kane goal seals win for hosts	https://www.bbc.co.uk/sport/football/64693818?at_medium=RSS&at_campaign=KARANGA	Tottenham Hotspur Chelsea Harry Kane goal seals win for hostsTottenham boost their hopes of top four Premier League finish with a win over Chelsea that increases the pressure on Blues boss Graham Potter	2023-02-26 15:34:58