![]() ![]() The arithmetic sequence is the sequence where the common difference remains constant between any two successive terms. You can use the arithmetic sequence formula to calculate the distance traveled in the fifth, sixth, seventh, eighth, and ninth second and add these values together.The arithmetic sequence formula is used for the calculation of the n th term and sum of an arithmetic progression. There is an alternative method to solving this example. Now, we can find the result by simple subtraction:ĭistance = S₉ - S₄ = 388.8 - 74.8 = 314 m How to calculate this value? It's easy - all we have to do is subtract the distance traveled in the first four seconds, S₄, from the partial sum S₉. ![]() However, we're only interested in the distance covered from the fifth until the ninth second. S₉ = n/2 × = 9/2 × = 388.8 mĭuring the first nine seconds, the stone travels a total of 388.8 m. The distance traveled follows an arithmetic progression with an initial value a = 4 m and a common difference, d = 9.8 m.įirst, we're going to find the total distance traveled in the first nine seconds of the free fall by calculating the partial sum S₉ ( n = 9): What is the distance traveled by the stone between the fifth and ninth second? Every next second, the distance it falls is 9.8 meters longer. ![]() During the first second, it travels four meters down. We will take a close look at the example of free fall.Ī stone is falling freely down a deep shaft. Let's analyze a simple example that can be solved using the arithmetic sequence formula. This formula will allow you to find the sum of an arithmetic sequence. Substituting the arithmetic sequence equation for nᵗʰ term: All you have to do is to add the first and last term of the sequence and multiply that sum by the number of pairs (i.e., by n/2). That means that we don't have to add all numbers. ![]() The sum of each pair is constant and equal to 24. We will add the first and last term together, then the second and second-to-last, third and third-to-last, etc. Let's try to sum the terms in a more organized fashion. We could sum all of the terms by hand, but it is not necessary. Look at the first example of an arithmetic sequence: 3, 5, 7, 9, 11, 13, 15, 17, 19, 21. Trust us, you can do it by yourself - it's not that hard! Our arithmetic sequence calculator can also find the sum of the sequence (called the arithmetic series) for you. A perfect spiral - just like this one! (Credit: Wikimedia.) If you drew squares with sides of length equal to the consecutive terms of this sequence, you'd obtain a perfect spiral. It's worth your time.Ī great application of the Fibonacci sequence is constructing a spiral. Interesting, isn't it? So if you want to know more, check out the fibonacci calculator. Each term is found by adding up the two terms before it. This is not an example of an arithmetic sequence, but a special case called the Fibonacci sequence. Now, let's take a close look at this sequence:Ĭan you deduce what is the common difference in this case? What happens in the case of zero difference? Well, you will obtain a monotone sequence, where each term is equal to the previous one. Naturally, if the difference is negative, the sequence will be decreasing. If the common difference of an arithmetic sequence is positive, we call it an increasing sequence. In fact, it doesn't even have to be positive! Some examples of an arithmetic sequence include:Ĭan you find the common difference of each of these sequences? Hint: try subtracting a term from the following term.īased on these examples of arithmetic sequences, you can observe that the common difference doesn't need to be a natural number - it could be a fraction. ![]()
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FluiddPi is a preconfigured image for Klipper that comes with all the necessary functionalities you'll need to install and run on your system.Klipper is a highly versatile piece of software and can run with almost any machine.# select "Enable extra low-level configuration options" and select # serial (on USART3 PB11/PB10), which is broken out on the 10 pin IDC # cable used for the LCD module as follows: # 3: Tx, 4: Rx, 9: GND, 10: VCC # Flash this firmware by copying "out/klipper.bin" to a SD card and # turning on the printer with the card inserted. You do not need to follow instructions pertaining to OctoPi or OctoPrint found in the Klipper documentation. Klipper setup Please read and follow the Klipper documentation in order to setup your machine. I couldn't find it in the config and it was driving me crazy. They are switching to "rotation_distance" instead of "step_distance". The right side of the .Installation Ease of installation (with using a Mainsail/Fluidd OS image on a RPi as the baseline easy) Klipper check the MCU step benchmark page and run one of those tests ( ) input shaper Mainsail webcam (mostly network issue not performance issue) smoothness framerate timelapse (time to create)I am currently setting up klipper on my e3v2 because I tried linear advance and I did not win the board lottery so I'm switching to klipper as I already had octopi set up. We'll use this SD card to install Klipper on your Ender 3. Insert a blank SD card into the computer using a card reader. When finished, press Q then Y to save your configuration.25 ส.ค. Using your navigation keys, move through the menus and replicate the same settings I used. In order to install Klipper, you will need the following: Raspberrpy Pi with OctoPi installed (this can be done with any linux computer running Octoprint) SKR 1.3 board from BIGTREETECH running the TMC2208 drivers Install Klipper on SKR 1.3 Login via SSH on the server Run git clone Enter the Klipper folder: cd klipper Open the Klipper Firmware Configuration screen using the following command: make menuconfig The Klipper Firmware Configuration screen will appear.Thanks everyone for the help! Ender 3 for Christmas. There was a ton of great advice, and when I started looking, realize the issue wasn’t a cracked extruder arm, but erosion of the extruder itself. I posted in here a short while back asking for help with my extruder jamming. Filament problems require Lego solutions. pin: ar6 pwm: false hardware_pwm: false value: 0 shutdown_value: 0. I used pin ar6 on my arduino for the buzzer. See …This goes in the printer.cfg on the host. It combines the power of a general purpose computer with one or more micro-controllers. See …Welcome to the Klipper project! Klipper is a 3d-Printer firmware. Welcome to the Klipper project! Klipper is a 3d-Printer firmware. ![]() ![]() ![]() ![]() Go back to the main menu and select install zip. – If you mounted /storage/sdcard0, then: adb push update.zip /storage/sdcard0/ – If you mounted /sdcard or /data, then: adb push update.zip /sdcard/ where update.zip should be replaced with the package filename. Now, push the package(s) to your device (also, see tip below): If you do not see one of these partitions, then instead mount the /data partition. If you see /storage/sdcard0 or /sdcard as a mountable volume, go ahead and mount it. On the device, navigate to the mounts and storage menu. Push and install method: Open a command prompt (or Terminal on Mac and Linux) and navigate to the directory holding the package(s) you would like to install.You can tell the install is complete if there were no fatal error messages and you have regained control over the menu. The installer does not necessarily display an “Install complete.” message. Follow the on-screen notices to install the package. Sideload method: select install zip > install zip from sideload.The sideload method is more universal across devices, whereas the push and install method is more commonly used: You have two options for transferring and installing the installation packages.Optional (Recommended): Select backup and restore to create a backup.Some devices have touch enabled ClockworkMod Recovery, in which case you may be able to swipe to, or touch, menu selections. On most devices, the power button is used to confirm a menu selection, but for some devices a physical home key acts as a selector. In ClockworkMod Recovery, use the physical volume buttons to move up and down.Boot to recovery mode, and connect the phone to your computer through USB.Optional: Download 3rd party applications packages, like Google Apps which are necessary to download apps from Google Play. Download the CyanogenMod build package for your device that you’d like to install to your computer.Make sure your computer has working adb.NOTE: If you are unable to S-OFF your device, and it is listed as supported by Revolutionary, join the Revolutionary IRC channel for further assistance. Some users have had to attempt S-OFF multiple times before achieving success. If the process takes longer than 15 minutes, reboot the device and attempt again. The device will reboot on its own and the entire process should only take a few minutes. 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The Revolutionary tool will also install ClockworkMod Recovery. Pay close attention to the HBOOT revision as newer updates break the tool’s ability to work properly. The status of your device’s support can be checked at their site. Obtaining S-OFF and installing a custom recovery on the Evo 3D (GSM)Ĭertain HTC devices can be exploited via a tool called Revolutionary to obtain S-OFF. 1 Obtaining S-OFF and installing a custom recovery on the Evo 3D (GSM). ![]() ![]() ![]() In a RAID 0 setup, the total storage capacity is the sum of all the disks used. For scenarios where you only care about performance, like gaming, RAID 0 can be useful. As the risk of failure is high, it isn’t used very often, particularly with a large number of disks, as the chance of failure would be even higher. But by the same token, it’s also much more prone to failure, as any drive failing would mean that all the data is lost.Īs RAID 0 provides no redundancy, some argue if it should even be called RAID. As the files are spread across multiple disks, the available throughput is multiplied as well. RAID 0 uses striping across atleast two disks. The RAID levels have evolved throughout the years, but the currently accepted standard, as maintained by SNIA, categorizes RAID 0 – 6 as the standard levels. Generally, RAID 0 – 4 can be managed with software controllers, while RAID 5 and higher levels require a physical RAID controller. However, as software controllers are dependent on the host machine for resources, the RAID performance boost is impacted as well. Physical RAID controllers can be pricy, while software controllers are free or affordable. The RAID array can be managed either by a dedicated RAID controller, software-based implementations (md, ZFS, etc.), or firmware and driver-based implementations. Generally, basic XOR is performed on the disks’ data to calculate the parity data, but certain RAID levels like RAID 2 or RAID 6 use dedicated parities, which we’ve talked about further in the article.įinally, there’s the matter of RAID implementation. Parity data is either stored on a dedicated disk or spread out across all the disks, and when any disk in the array fails, you can swap it out for a fresh disk and use the parity data and data from the other disks to rebuild the lost data. Parity is an error protection technique commonly used to provide fault tolerance and achieve redundancy. This makes the data on one disk redundant, but it’s intended as this allows data to be recovered in case one of the disks in the array fails. Mirroring is self-explanatory – the data from one disk is copied onto another. By concurrently accessing the data spread across multiple disks, you get to utilize the combined data throughput, which basically leads to improved performance. ![]() Depending on the RAID level, one or any combination of these techniques could be used.ĭata striping is the process of splitting consecutive segments of logically sequential data on different disks. ![]() We’ll talk about all these in further detail later, but for now, let’s just end it with a brief introduction.Īs for how RAID actually works, it implements techniques like data striping, disk mirroring, and parity. The Standard RAID Levels are RAID 0 – RAID 6, but there are numerous other levels of RAID that fall under categories like Nested RAID and Non-Standard RAID. Some are designed for one exclusive purpose, while others offer the best of both worlds. The degree to which the array focuses on redundancy or performance is dependent on the type of RAID used, typically referred to as RAID levels. Of course, this is only a broad description. Similarly, combining the specs of multiple disks provides significant performance boosts for I/O operations. Generally speaking, in a RAID setup, data is stored across multiple disks, with the primary objective of data redundancy and/or performance improvement.ĭata redundancy increases reliability by acting as a safety net against disk failure. RAID is a storage technology used to configure multiple physical disks as a single logical disk called a Logical Unit Number (LUN). ![]() ![]() ![]() The enemies are pretty smart, sometimes frustratingly so. The gameplay provides a decent challenge. Everyone: Fighting the Germans (and the Russians) With that said, the plot is not too memorable, and acts mainly as a means for you to pretend you’re playing for something more than the headshots. The story takes place over a few days in one city, but the time of day and locations range from the city square in the afternoon to a decrepit church at night, and the experience is quite varied overall. This isn’t necessarily to the detriment of the gameplay though. You’ll face the same types of objectives as you play through the story: infiltrate the location, place explosives to detonate remotely, kill the target, and so on. You’ll often clear out the enemies guarding a location from a distance, and then venture inside where they’re lurking around every corner. The game usually manages to strike a nice balance between close quarters stealth and longer ranged sniping. Hundreds of infantry, dozens of snipers, and a handful of tanks will fall prey to your trigger finger. You will be surprised at just how much firepower the enemy will use in an attempt to stop just one pesky US sniper though. ![]() It would be nice to have a friendly voice around sometimes, and I will certainly be persuading one of my friends to join me. There is a war going on after all, and it seems a little odd (especially since we know who won) that there seems to be no one else around fighting on your side. I imagine this is why they threw the ability to play through the campaign with a friend online as a spotter-sniper team, along with a few other co-op modes. While it is thoroughly invigorating to take out a tank with your sniper rifle by hitting the cap of the fuel tank, or to finish off an entire group of enemies from a distance without being spotted, it does get a little lonely at times when the action is low. You are truly a one man army, and it’s up to you to be your own sniper, spotter, and backup team. They don’t want it badly enough to send you in with some assistance however. Your mission isn’t just to kill the bad guys you’re crippling what remains of German forces while also trying to keep the Russians from getting their hands on German scientists who have intimate details of the V2 rocket program - intel that America wants for themselves. Don’t let that deter you too much though the story itself is a little different from what you might expect, thanks to an added Cold War twist. That’s right, like the first Sniper Elite, it is yet another game set during what is possibly the most overused historical period in the history of the genre. In the campaign, you take on the role of Karl Farlsburg, an OSS officer deployed to Berlin during the final days of World War Two. So when I played through the demo of Sniper Elite V2 on PS3 for the first time, I knew right away that I had to have it. I’m talking about stealthy, tactical, “one shot, one kill”, one man (or in my case, girl) army, invisible threat kind of sniping. I don’t mean the camping at the back of the base, guarding my precious kill/death while my teammates go for the objective kind of sniping. Off TV play is also here, but that doesn’t make up for the fact that the heart and soul of the V2 experience is simply absent.This will probably get my name put on a government watchlist somewhere, but I really love sniping. The team has added some Gamepad features such as weapon and item swapping along with the quintessential map, but that isn’t enough. We know the Wii U has a decent online infrastructure the system also has enough power to render the game, so why remove one of the key features in what could have been the definitive version? If that isn’t enough, the fact that this is labeled at full retail price on store shelves is nearly a slap in the face. Co-op was one of V2’s strongest bullet points, and to see it removed from a version released over a year after its source material is baffling. The co-op mode is also absent from this version, as well as any sign of online play at all. ![]() The campaign, as I mentioned, is still here, but players have to take it alone. How did it not make it into this version? This is perplexing on so many levels considering there is a version of the original game with that content packed in. For the most part, that experience still remains on the Wii U minus any of the DLC. It even had DLC that allowed players to pin down, and eventually take out the infamous Hitler in a cool alternate universe type spin-off. The original Sniper Elite V2’s campaign was a solid, if not flawed romp through the eyes of a sharpshooter during World War II. ![]() ![]() But, as I describe in Knocking on Heaven's Door, the story of physics has to do with advancing in scales. Lisa Randall: We understand the Standard Model of particle physics that tells us about matter's most basic elements and interactions (as observed so far) extremely well. Randall's most recent book, Knocking on Heaven's Door: How Physics and Scientific Thinking Illuminate the Universe and the Modern World, contains a chapter on the Higgs mechanism and boson, and several more on the application and potential of the Large Hadron Collider.ĪAAS MemberCentral had the opportunity to talk with Randall about the CERN results and the Higgs boson.ĪAASMC: Why is determining the existence (or lack thereof) of the Higgs Boson such an important question that it has attracted the professional efforts of thousands of scientists? She has received multiple awards and honorary degrees while pursuing the furthest boundaries of fundamental physics. ![]() Lisa Randall is the Baird Professor of Theoretical Physics at Harvard University. ![]() It is the last particle predicted by the SM that has still to be discovered experimentally. The quantum of the Higgs field is the Higgs boson. Why is finding the Higgs boson so important to the future of high energy physics? The Standard Model (SM) explains the existence of massive particles by the Higgs mechanism, in which a spontaneously broken symmetry associated with a scalar field (the Higgs field) results in the appearance of mass. Although these indications are at about the 2 sigma level of certainty (5 sigma levels are required to claim a discovery), the experimental results suggest that the existence and properties of the Higgs boson should be pinned down during 2012, if all goes well. Two recent experiments (ATLAS - A Toroidal Lhc ApparatuS, and CMS - Compact Muon Solenoid) have independently found indications that the Higgs boson may exist (with a mass of about 125 GeV/c 2, or roughly 133 times the mass of a hydrogen atom). ![]() The event shows characteristics expected from the decay of a Higgs boson but is also consistent with background Standard Model physics processes. Real CMS proton-proton collision events in which 4 high energy electrons (green lines and red towers) are observed. ![]() |