![]() ![]() ![]() Johannes Kepler triangulated the position of Mars by using observations of Mars when it returned to the same position in its orbit. Furthermore, the original Copernican model was no simpler than the earlier Ptolemaic model.Īs 16th Century astronomers did not have access to telescopes, Newtonian physics, and statistics, it wasn’t obvious to them that the Copernican model was superior to the Ptolemaic model, even though it correctly placed the sun in the centre of the solar system. In some cases the position of Mars is in error by 2 degrees or more (far larger than the diameter of the moon). Copernicus disposed of the equant, which he despised, but replaced it with the mathematically equivalent epicyclet.Īstronomer-historian Owen Gingerich and his colleagues calculated planetary coordinates using Ptolemaic and Copernican models of the era, and found that both had comparable errors. The Copernican planets still travelled around the solar system using motions described by the superposition of circular motions. Unfortunately, the original Copernican model was loaded the Ptolemaic baggage. The original Copernican model has similarities to Ptolemaic models, including circular motions and epicycles. And it thus became the primary means of explaining planetary motion for over a millennium. But, to his credit, Ptolemy’s model predicted the positions of planets in the night sky with an accuracy of a few degrees (sometimes better). Ptolemy explained planetary motion using the superposition of two circular motions, a large “ deferent” circle combined with a smaller “ epicycle” circle.įurthermore, each planet’s deferent could be offset from the position of the Earth and the steady (angular) motion around the deferent could be defined using a position know as an equant, rather than the position of the Earth or the centre of the deferent. This model, from an Arabic copy of Ptolemy’s Almagest, is illustrated above. Qatar National LibraryĪncient Greek astronomers produced geocentric (Earth-centred) models of the solar system, which reached their pinnacle with the work of Ptolemy. They’re a bit brighter than most stars and twinkle less, but otherwise look like stars.Ī page of an Arabic copy of Ptolemy’s Almagest, illustrating the Ptolemaic model for a planet moving around the Earth. At first the planets don’t really distinguish themselves from the stars. ![]() Imagine you’re an astronomer from antiquity, exploring the night sky without the aid of a telescope. These notes give us a clue to the labour, insights and genius that drove the Copernican revolution. We can gain insights into how this profound shift unfolded by looking at the actual notes left by the astronomers who contributed to it. Rather, it took almost a century of new theory and careful observations, often using simple mathematics and rudimentary instruments, to reveal our true position in the heavens. In antiquity people believed the Earth was the centre of the solar system and the universe, whereas now we know we are on just one of many planets orbiting the sun.īut this shift in view didn’t happen overnight. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.It’s not a stretch to say the Copernican revolution fundamentally changed the way we think about our place in the universe. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition and property loss or damage. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. ![]()
0 Comments
![]() ![]() Supplies a complete set of nice, round mesh-based water pipes, boxy item-transport tubes, and devices that work with them. Adds bone and bonemeal giving the ability to quickly grow plants and saplings. A mod that adds an api for cars, planes, and other vehicles. Adds good-looking, realistic trains with realistic rails.!! When updating, install basic_trains!! Vehicles D00Med. Fly around with fully functional hang-gliders! Advanced Trains orwell. Adds a deep underground realm with different mapgen that you can reach with obsidian portals. Provides a small selection of "basic" materials and items that other mods should use when possible - things like steel bars and chains, wire, plastic strips and sheets, and more. Take care of them! Basic Materials and items VanessaE. Very cute mascots: Kittens, puppies, duckies, lambs. Adds Dragons and related resources and equipment to Minetest Game.Ĥ Water Life Gundul. Replaces the default inventory and adds a number of features, such as a crafting guide. Adds digital circuitry, including wires, buttons, lights, and even programmable controllers. Adds a mob api for mods to add animals or monsters etc. Submit an issue for anything you re missing, or get the source code and dig into it yourself. The engine is open source and transparently developed. You can find help with any problems from our community. There are over 800 open source mods on ContentDB, which are ready to be used, adapted or learned from. Publish your mods on ContentDB, and contribute to others mods. Use the same Lua API to make mods for any Minetest-based game. No need to worry about tricky voxel rendering or networking instead, write scripts to add items and control game play. Create your own voxel game using our Lua API. Choose from many different fast map generators included in the engine, or install one as a mod. Not happy with the look of the textures? Change them! Beautiful Map Generators. Play by yourself, locally with your friends, or online with dozens of players on a server. You can mine 31,000 blocks down, or build 31,000 blocks up. With 62,000 62,000 62,000 blocks, there s no running out of space. Just download a game or connect to a server.ģ Enormous Maps. You could survive in a harsh environment, build creatively, or fight other players. Available for Windows, macos, GNU/Linux, FreeBSD, OpenBSD, DragonFly BSD, and Android. ![]() Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. You will probably want Minetest Game as well. Get the latest stable or development source code from GitHub. Use Homebrew to get the stable version: brew install minetest Daily unstable builds. You can compile Minetest and choose build options easily using the FreeBSD port dialogs. On FreeBSD 9.1 and newer, you can use the official pre-built packages: pkg install minetest minetest_game. Flatpak (all distributions) - Stable Snap (all distributions) - Stable Debian - Stable Ubuntu - Stable Ubuntu / Linux Mint (PPA) - Stable, Unstable Fedora - Stable opensuse - Stable Mageia - Stable Arch Linux - Stable, Unstable Gentoo - Stable Void Linux - Stable. If they are too out of date, you can build from source. They may contain excessive advertisements or spyware, or be distributed under proprietary terms. Note: We advise not to use unofficial builds commonly found on the Play Store. These builds are more recent than the officially released builds and contain new features (at the cost of stability). You can also get the latest development version of Minetest from builds made by community members. Minetest portable, 64-bit (recommended) Minetest portable, 32-bit. May work on older versions, but not officially supported. You can then add mods on top of a game in order to customize your experience further. Usually Minetest comes with Minetest Game, to supply the default items and blocks. Different games have different objectives, such as survival, building or Player vs Player. Games provide basic game play for the engine to run using Lua scripts. Otherwise, feel free to look at the changelog. Are you a new user? Have a look at our Getting Started, FAQ, and Tutorials pages on our wiki. ![]() ![]() ![]() These items include: blades/saws, jaws & implements for our multi-tools, and axel screws. Yes, there are some items that cannot be shipped. If your product does not hold sentimentality at Gerber’s discretion a comparable replacement will be provided to you of equal value.Īre there items that Gerber can't ship to me? Your original product will be returned to you as is. ![]() If you cannot repair my sentimental product, will I get another? If your product cannot be repaired, it will be returned to you as is. However, technological advances may inhibit the ability to repair older products that have been out of production for an extended period of time. Gerber makes every effort to provide repair services whenever possible. While filling out the warranty form, be sure to mark the item as sentimental in order to retain the original. Continued rubbing on a sheath or pants pocket will cause the coating to wear through over time or contact with any metal objects will scratch the coating. Is there anything I can do? Will Gerber Gear warranty the finish or refinish the product?Ī black Teflon or black oxide coating is applied to specific knives for ornamental reasons. The black finish on my blade is peeling or coming off. If the replacement item is discontinued, you will be given the option for a similar item as replacement or store credit to. What if the item I am hoping to replace is discontinued? Yes, like all Gerber products, customized items are covered under the Gerber Guarantee. To submit a warranty claim outside of North America, please email my Customized item covered under warranty? I live outside of North America, how do I submit a warranty claim? Gerber's warranty covers material and manufacturing defects. No, stolen or lost products are not covered under warranty. This will likely only happen in the case of a custom item, or when a repair is authorized. Do I need to send my defective item into the factory?Īt this time, you do not need to send items into the factory unless told to do so. ![]() ![]() Many of my clients tend to rush through their reps without properly engaging their abs. If done incorrectly, bicycle crunches can be hard on the back and hips. ![]() The common mistakes people make when doing bicycle crunches However, if you are doing more cardio-based bicycle crunches and looking to do as many as possible, you could do up to 40 at a time. I recommend 20 reps total, which is 10 bicycle crunches to the left and 10 to the right. Lastly, focusing on core engagement and connecting your breathe to your movement has a meditative effect and takes greater focus than going as fast as you can. Second, you'll also engage your deepest abdominal muscle, your transverse abdominis, which can be forgotten when you speed through ab workouts. First, you'll perfect the form without recruiting muscles that aren't needed. ![]() If you do bicycle crunches slowly, you'll focus more on precisely engaging each muscle at work.Īs a personal trainer and Pilates instructor, I recommend doing bicycle crunches slowly for a number of reasons.If you do bicycle crunches quickly, you'll burn more calories by speeding up your heart rate and essentially turning this strength training exercise into a cardio exercise, too.The answer is both, depending on your goals. Is it better to do bicycle crunches fast or slow? Adding bicycle crunches to a well-rounded workout routine, along with a healthy eating plan, is a great way to tone your stomach and help get rid of excess belly fat. ![]() Strength training and building muscle also helps to speed up the metabolism, which helps to burn fat everywhere, including the belly. While you're working the abdominal muscles in a bicycle crunch, you'll strengthen your core muscles, which can have a toning and tightening effect. Do bicycle crunches burn belly fat?īicycle crunches can help tone the belly area, but keep in mind that there's really no such thing as spot-reduction with fat loss. Twisting and reaching is also required for everyday activities like getting things off of shelves, putting things away in cabinets and playing with kids. From picking up heavy grocery bags to climbing the stairs, a strong core is required for a lot of everyday activities and can even help prevent common injuries or strains. They are also a great move to strengthen your entire core. ![]() ![]() An annual award ceremony has been held since 2005. ![]() The Grand Prize winners of the annual Famitsu Awards, voted by Famitsu magazine's readers. Following the magazine's revival in 1992, it published the Electronic Gaming Awards in January 1993 for the best video games released in 1992. It was held since 1980 (for games released in 1979 and earlier) and were announced annually by Electronic Games magazine since 1981, covering several platform categories. The Arcade Awards, also known as the Arkie Awards, was one of the first video game awards, dating back to the golden age of arcade video games and lasting up until the video game crash of 1983. The Legend of Zelda: Breath of the Wild Įlectronic Gaming Awards (formerly Arcade Awards) ![]() The awards were previously known as the Interactive Achievement Awards until 2013. Awards are awarded by the Academy of Interactive Arts & Sciences (AIAS), a non-profit organization of industry professionals. YearĬzechoslovakia 1938–89: The Assassination The Czech Game of the Year Awards are annual awards that recognize accomplishments in video game development. Tom Clancy's Ghost Recon Advanced Warfighter First presented in 2004 following the restructuring of the BAFTA Interactive Entertainment Awards, the awards are presented by the British Academy of Film and Television Arts (BAFTA), and are thus commonly referred to as the BAFTA Games Awards. The British Academy Games Awards are an annual British awards ceremony honoring "outstanding creative achievement" in the video game industry. Main article: British Academy Games Award for Best Game ![]() ![]() ![]() Subclassing a model makes it possible to customize it in many ways: You can provide tooltips for the items, change the background color, provide calculated values, provide different values for viewing and editing, handle null values specially, and more. See the Query Model example for the complete source code. prepare( "update person set firstname = ? where id = ?") The following two functions make fields 1 and 2 of a query model editable:īool EditableSqlModel ::setFirstName( int personId, const QString &firstName) If you need a read-write model that operates on an arbitrary result set, you can subclass QSqlQueryModel and reimplement flags() and setData() to make it read-write. QSqlTableModel is optimized to operate on a single table at a time. See Model/View Programming for more information. You can create your own delegates by subclassing QAbstractItemDelegate or QItemDelegate. The delegate is also responsible for providing editor widgets (e.g., a combobox) when the user starts editing an item in the view. The default delegate, QItemDelegate, handles the most common data types ( int, QString, QImage, etc.). The items in the view are rendered using a delegate. Likewise, if you remove rows using removeRows(), the rows will be marked with an exclamation mark (!) until the change is submitted. If you insert rows programmatically using QSqlTableModel::insertRows(), the new rows will be marked with an asterisk (*) until they are submitted using submitAll() or automatically when the user moves to another record (assuming the edit strategy is QSqlTableModel::OnRowChange). QTableView also has a vertical header on the left with numbers identifying the rows. Model - >setHeaderData( 3, Qt ::Horizontal, QObject ::tr( "Country")) ![]() Model - >setHeaderData( 2, Qt ::Horizontal, QObject ::tr( "City")) Model - >setHeaderData( 1, Qt ::Horizontal, QObject ::tr( "Name")) Model - >setHeaderData( 0, Qt ::Horizontal, QObject ::tr( "ID")) ![]() ![]() ![]() Dies ist als das unbestimmte Verhalten eines Elektrons bekannt. ![]() Ähnlich verhält es sich bei einem Elektron, denn seine Position und Geschwindigkeit können nicht gleichzeitig bekannt sein, auch seine weitere Entwicklung ist nicht vorhersehbar. Wenn jedoch nur die ursprüngliche Position des Golfballs bekannt ist, ist es nicht möglich, seine endgültige Position davon abzuleiten. Mit diesen Daten kann die Position und Geschwindigkeit des Golfballs zu jedem Zeitpunkt bestimmt werden. Nach der klassischen Physik kann der Pfad und die Flugbahn des Golfballs vorhergesagt werden und zwar durch Kenntnis seiner Ausgangsposition, der Kraft mit der er getroffen wird, und dem Einfluss anderer Faktoren wie Schwerkraft, Wind und Luftwiderstand. Je genauer man die Position des Elektrons kennt, und je kleiner das Delta-x, desto weniger ist die Geschwindigkeit des Elektrons sicher und umso größer ist das Delta-v, und umgekehrt.īetrachten wir nun einen Golfball, der auf einem Abschlag ruht. Dies ist als Heisenbergs Unsicherheitsprinzip bekannt. Werner Heisenberg berichtete, dass die Unsicherheit in diesen Eigenschaften, dargestellt durch delta-x und m-delta-v, größer oder gleich einer endlichen Menge sein muss der Planck'schen Konstante über 4 pi. Das bedeutet, dass es auch unmöglich ist, die genaue Position und Geschwindigkeit eines Elektrons gleichzeitig zu beobachten. Die Teilchennatur und Wellennatur eines Elektrons, und damit auch seine Position und Dynamik, sind daher komplementäre Eigenschaften. Mit anderen Worten, wird das Elektron entweder als Teilchen oder als Welle, aber niemals beide zur gleichen Zeit beobachtet. Beim Versuch, die Teilchennatur des Elektrons zu beobachten, geht seine Wellennatur verloren. Außerdem wird das Interferenzmuster nicht mehr beobachtet stattdessen sind zwei helle Linien zu sehen. Während des Experiments sind die Blitze jeweils nur an einem Spalt beobachtet, aber niemals an beiden gleichzeitig. Wenn ein Elektron durch einen Spalt wandert, erzeugt es einen kleinen Blitz der den Spalt anzeigt wo es gerade durchgekommen ist. Um dies zu untersuchen, wird ein Laserstrahl direkt hinter den Spalten positioniert. Wenn Elektronen eins nach dem anderen passieren, wird dasselbe Muster beobachtet.ĭa ein Elektron ein Teilchen ist, sollte es möglich sein zu überwachen, welcher Spalt oder welche Spalte es passiert. Dies ist eine einzigartige Eigenschaft der Wellen. Wenn ein Elektronenstrahl durch die Spalte geht, wird ein Interferenzmuster erzeugt. Was passiert, wenn ein Experiment vorgeschlagen wird, um die duale Natur eines Elektrons zu beobachten? Erstens, überdenken Sie das Doppelspaltexperiment wo es zwei eng beieinander liegende Öffnungen gibt. Leider ist es nicht möglich zu beobachten, wo das Elektron gleichzeitig ein Teilchen ist mit einem definierten Ort und einer Welle mit einer bekannten Geschwindigkeit oder Momentum zur gleichen Zeit. Ein Elektron hat also sowohl Wellen-als auch teilchenhafte Eigenschaften. Es verhält sich aber auch wie eine Welle, mit der Geschwindigkeit v, wie die de Broglie-Beziehung zeigt. Ein Elektron ist ein subatomares Teilchen mit der Masse m. ![]() ![]() In Among Us, the characters embody crewmates aboard a spaceship that falls victim to a mysterious and perilous imposter. In the game, the imposter is a shape-changing alien that looks like the other crewmates but is only there to sabotage the ship and kill all players. The remaining players enter the game as crewmates. The imposter in Among Us is a role assigned at random to any one of the total 15 players. For instance, when a crew member finishes a designated task in the laboratory, you can kill them, switch off the lights, and hide in any vents to kill another member. When a crew member walks by, you can jump out from your hiding place and kill them before they can report your identity. How do you kill in Among Us?Īs an imposter, you must wait in the shadows and sneak up on other players announced. ![]() The other three maps are far more vast, giving the imposter more advantage. This map gives very little space for imposters to kill members without being seen. The default map is The Skeld, a spaceship featuring a circular layout with well-balanced spaces and bottlenecks. When you play Among Us on your Windows device, you can access four maps-The Skeld, Polus, Mira HQ, and the Airship. Additionally, dead crewmates turn into ghosts and can sit back and watch the rest of the game play out. Doing this makes the game fun and sends crewmates on a wild goose chase to pinpoint the killers. If the game has 15 players, you can choose to have more than one imposter. Only when a player dies can the crewmates talk and call an emergency meeting to discuss and remove a suspicious player. Each player must move from one room to another, completing tasks without giving others any reason to vote them off. Players move around this alien ship using basic forward, backward, right, and left movements. The game takes place on a spaceship and offers three levels. ![]() If you get dropped in as a pretend crew personnel, the game turns a lot more fun, as you get to kill everyone one by one before you’re discovered. On the other hand, the imposter must kill the entire crew or sabotage the completion of tasks. It is a survival game where crewmates must complete the assigned tasks and vote out the imposter. ![]() ![]() ![]() The profile of Jones’ case grew significantly after it was featured in “The Last Defense,” a three-episode documentary produced by actress Viola Davis that aired on ABC in 2018. Jones was convicted of first-degree murder and sentenced to die for the 1999 shooting death of Paul Howell, a businessman from the Oklahoma City suburb of Edmond, during a carjacking. ![]() “It’s a shame that it’s gotten this far, 24 hours away.” Been trying to get the facts stated and the truth to be told for a while,” Mayfield said. “That’s not something that’s easy to talk about. Even Baker Mayfield, quarterback for the NFL’s Cleveland Browns and a Heisman Trophy winner from the University of Oklahoma, weighed in, his eyes filling with tears. Prayer vigils were held at the Oklahoma state Capitol, and barricades were erected outside the governor’s mansion. Jones' looming execution - and Stitt's silence on his decision - prompted high school students across Oklahoma City to walk out of their classes Wednesday, and protests were planned Thursday in Los Angeles Washington Newark, New Jersey and Saint Paul, Minnesota. “Governor Stitt took an important step today towards restoring public faith in the criminal justice system by ensuring that Oklahoma does not execute an innocent man,” Bass said in a statement. ![]() The state’s Pardon and Parole Board recommended in a 3-1 vote on November 1 that Stitt commute Jones’ sentence to life in prison with the possibility of parole, with several members of the panel agreeing they had doubts about the evidence that led to Jones’ conviction.Īmanda Bass, a lawyer representing Jones, said the team had hoped Stitt would have fully supported the parole board's recommendation of granting Jones a chance at parole, but that they were grateful Jones wouldn't be executed. Earlier, Jones' attorneys had filed a last-minute emergency request seeking a temporary stop to his execution, saying Oklahoma’s lethal injection procedures pose a “serious and substantial risk of severe suffering and pain to prisoners.” The lawyers cited last month’s execution in which John Marion Grant convulsed and vomited as he was being put to death. ![]() ![]() ![]() The Ultimate Guide To Maintaining Your Bat With careful consideration, you’ll find the perfect bat that will boost your game and increase your enjoyment on the field. Consider recommendations for different player types, such as high school or college players. Meta baseball bats are perfect for players who want to enhance their overall performance. Start identifying your style of play, whether it’s power hitting or speed, to determine which bat is best for you.Īdditionally, ensure the bat is compatible with league regulations. When it comes to selecting the perfect meta baseball bat that fits your style, it’s essential to take into account several key factors. How To Choose A Meta Baseball Bat That Fits Your StyleĬhoosing the right baseball bat can be a daunting task for players of all levels. Keeping these factors in mind will aid in selecting the best baseball bat that will suit your style, making you more effective when playing. A good grip ensures that the bat won’t slip out of your hands while swinging. Finally, consider the comfort and grip handle of the bat. A well-balanced bat with weight distributed evenly can result in a more effortless and balanced swing. A larger barrel will provide a larger sweet spot, resulting in more power when hitting the ball.Īdditionally, weight distribution and balance can impact your swing. One important aspect to consider is the barrel size and diameter. When it comes to choosing a meta baseball bat, you should consider several factors. It may be more expensive, but the difference in performance is undeniable. If you’re serious about baseball and want to take your game to the next level, investing in a meta bat is a smart choice. ![]() Many players have reported that their hitting improved significantly when using a meta bat. The benefits of using a meta bat include improved swing speed, increased power, and better overall performance.Ĭompared to traditional bats, meta bats are more expensive, but the added benefits make it worth the investment. It has a barrel made from composite materials that make it more durable and lighter than traditional bats. Understanding The Importance Of A Meta Baseball BatĪ meta baseball bat is a high-performance baseball bat used by professional players.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |