Wind tunnel work to measure airfoil characteristics was soon followed by the first development of validated numerical methods to predict chordwise pressure distributions and airfoil characteristics without making as many measurements in the wind tunnel. Early airfoil shapes were improved systematically but empirically by trial and error over many decades using a combination of testing in the wind tunnel and theoretical developments. The figure below shows a relatively rapid evolution of airfoil shapes tailored to aircraft applications between 19, with the thin and highly cambered airfoil sections used on early airplanes being relegated to history. The Wright brothers also built and used an open-return wind tunnel that would prove instrumental to the success of their 1903 Flyer, recognizing that not only the airfoil cross-section was important for wing efficiency but also the wing span-to-chord ratio, now known as the aspect ratio. Not long after Phillips, Gustave Eiffel conducted more experiments using a wind tunnel of the open-return (single passage) type. Some of the earliest known “concavo-convex” airfoil shapes were patented in the late 1880s. Phillips also tested these airfoils in one of the very first wind tunnels. Notice the thin, highly cambered profile shapes, which are now known to have poor aerodynamic efficiency compared to modern airfoils, at least under the operating conditions of most flight vehicles. Taking inspiration from nature is nothing new in engineering, but history shows that it should not necessarily be a basis for our engineering. Some of the earliest known airfoil sections considered for aircraft concepts were patented in the 1880s by Horatio Phillips, as shown in the figure below, which were inspired by the wings of birds. Taken from “ Aeronautical & Miscellaneous Note-Book of Sir George Cayley,” Cambridge University Press, 1933. Cayley’s sketch of the cross-section of a trout looks remarkably like a modern airfoil section. Cayley obtained the profile shown in the drawing below by measuring the cross-sectional shape of a trout, which, interestingly enough, conforms closely to modern low-drag “laminar” airfoil sections. Cayley made essential observations about drag, including “It has been found by experiment that the shape of the hinder part of the spindle is of as much importance as that of the front in diminishing resistance.” Cayley referred to the shape of a wing as spindle-shaped. Sir George Cayley, often revered as the “Father of Aeronautics,” delineated the problem of sustentation, i.e., aerodynamic lift, from that of drag, i.e., the component of aerodynamic resistance. In this regard, theory and experimentation (e.g., wind tunnel testing) have been used to design airfoils to meet specific operating requirements for different aircraft types, including low-speed airplanes, high-speed airplanes, helicopters, propellers, wind turbines, etc. Historically, the most suitable airfoils for most practical engineering applications were obtained through an evolutionary process. Understand the differences in the shapes between subsonic, transonic, and supersonic airfoil sections.Know how to construct a NACA airfoil profile geometrically using a camberline shape and a thickness envelope.Be able to identify and explain the significance of the critical geometric parameters that define the shape of an airfoil.Appreciate the historical evolution of airfoil sections for aircraft applications.Historically, the design of airfoil shapes for specific applications has proceeded evolutionarily, with wind tunnel experiments, theoretical analysis, and flight testing all being used synergistically to develop the best airfoil shapes for application to specific flight vehicles. Airfoils for high-speed aircraft, especially for supersonic flight, are much thinner with more pointed leading edges and much less camber. To this end, not all airfoils are created equally, and different airfoil shapes will be better suited for one application versus another.įor example, airfoils for use on the wings of low-speed airplanes are generally thicker (in terms of their thickness-to-chord ratio) and have more surface curvature or camber. Aerospace engineers must know how to select or design suitable cross-sectional wing shapes (often called airfoil profiles or airfoils) for use on a diverse range of flight vehicles such as subsonic, transonic, and supersonic airplanes, various types of space launch vehicles, as well as helicopter rotors, propeller blades, wind turbines, UAVs, etc.
0 Comments
Optional: potatoes, carrots, onions or any other vegetables you’d like to addĪccompaniment: mashed potatoes, orzo or egg noodles (Recipe adapted from Gourmet, February 2001)ģ-3 1/2 pound boneless chuck roast, trimmedġ head of garlic, separated into cloves (unpeeled) Oven Braised Beef with Tomato Sauce and Garlic Let me know what you think in the comment selection below and if you have any questions! Eventually, I hope to add separate fitness and nutrition page to the blog but that’s later in 2010!Īnd now for the most delicious 3 ingredient roast recipe… I hope I can provide a little bit of motivation and inspiration that you can enjoy delicious food and stay fit! I’m going to talk about that balance in my posts. In a nutshell, it’s all about maintaining a balance. If you’re not into it – simply scroll down for the recipe! It is definitely still first and foremost a food blog but I am going to talk about my nutrition and exercise for the day/week in my posts. Don’t worry, I’m not changing the focus of this blog. One of the questions I get all the time is, “How do you cook and bake all that food and stay fit?” Well…I’m going to start sharing that information with you on the blog. If you’ve read the “About Jen” section of this site you know that my second love is fitness and nutrition. I’m making shredded beef enchiladas with the leftovers tomorrow night. I served last night’s roast over mashed potatoes with a salad and french bread. Brandon decided that this should be my “go-to” method for cooking roasts. I admit that I added a couple carrots and some onion during the last hour of cooking but it totally wasn’t necessary! I just wanted more veggies. I was a little nervous because the recipe called for so much garlic but it really mellows out in the oven during the long, slow cook and adds a wonderful flavor. I threw everything in my dutch oven before I left for yoga and came home to an amazing smelling house! You don’t even brown the beef before placing it in the dutch oven! Can it get any easier than that? Off I went to the grocery to grab the ingredients. It only had three ingredients and had received numerous positive reviews. I found this recipe for Oven Braised Beef with Tomato Sauce and Garlic. Our grocery store had chuck roasts on sale so off I went to Epicurious to look for a Gourmet magazine pot roast recipe. It is freezing here (seriously – lows in the teens, highs in the 30s – that is cold in the South!) and slow cooked meat sounded like the perfect dinner. Since I was a little crunched on time given our afternoon arrival home and wanting to make my yoga class, I was looking for an easy meal. It’s the perfect way to end my weekend and prepare my mind and body for the work week ahead. I attend an incredible hot yoga class every Sunday afternoon at 4. I was happy to arrive home yesterday and get back in the swing of our normal routine. Yum! I love going home and enjoying my parents cooking! □ It was full of oysters, crab, shrimp and fresh andouille! I roasted up some okra for a side dish and my mom made my favorite banana pudding recipe. It was exactly the dark color of Paul’s in the book. SO DELICIOUS! He made his own seafood stock and made the perfect roux. It was so good to see them! My mom, Brandon and I went to the Georgia Aquarium on Saturday afternoon while my dad stayed home prepping our amazing dinner! He made Paul Prudhomme’s Seafood Gumbo. We rang in the new year in Asheville with The Avett Brothers and then headed to Atlanta on New Year’s Day for yet another Avett Brothers show and to spend the weekend with my family. Since we spent Thanksgiving with my family this year, we stayed in Charlotte and celebrated Christmas with Brandon’s family. Happy New Year everyone! The holidays have been busy for us with lots of family time and traveling.
Input the Twitch Viewer count URL you copied earlier. It will have info such as URL, a custom CSS field, and other fine-tuning options. For this tutorial, I’m simply calling it, “Twitch Viewer Count.” This is so I can find it easily in the source window should I need to make adjustments later.Ĭlick the “OK” button after naming the source.Ī new window will open and show you a few customizable settings. Select “Browser” from the list of sources from the display. Make sure you’re on the scene you want to use in OBS.įrom OBS, click the “+” icon under Sources. Now that we have the URL for the Twitch viewer count, it’s time to add it to OBS. It happens more often than you would think. This is locked by default in the event you accidentally show the screen during a live broadcast. You can also click to unlock the URL so you can see it immediately. Personally, I just copied the URL to Notepad for the moment. I suggest pasting this in Notepad or another doc app for safekeeping. This will copy the URL of your Twitch viewer count to the computer’s clipboard. Scroll back up and click the “Copy” button. When you’re ready, click the “Save Settings” button on the bottom. So you can use this feature for those streaming services. Enabled Stream Types: Streamlabs supports Twitch and YouTube viewers. The actual background is removed when the tool is live. It’s only there for demonstration purposes only.
a) right click the missing driver (yellow triangle) C) on how to download windows drivers for theĢ) Plug TM4C123 LaunchPad board into PC (debug port) and turn on powerģ) Open the Device Manager in Windows, and for each TI driver (twice) The official Texas Instruments web site where you can download the How to install EE319K/EE445L/EE445M software on a Macintosh How to install LaunchPad drivers for the TM4C123 However, you can use this file to install Keil on additional computers.Ī slide show of the process to download and install Keil 5.21a can be seen at slide show. After you have run the MDK538A.EXE installer, You will need to find the Keil directory because the TExaS example files will be Step 3) Execute the MDK538A.EXE file, installing the application some place easy to find, Step 2) Right-click on MDK538A.EXE and download this 887M file to your computer. So if you have any Keil-specific questions you could register and post them at ARM does provide support for Keil via its ARM University. It should not cost any money, and you can select or not select whether you want email from ARM. Set your devices to the Texas Instruments (TI) and Cortex-M4. Set your Company to the University of Texas at Austin. Enter your contact information with valid address, phone and email. Step 1) How to install Keil uVision for the ARM, MDK-Lite (32KB) Edition. It is possible to install both Keil uVision 4.74 and Keil uVision 5.38 on the same computer. The Keil application does not require a serial number or license key. We are really sorry, but there are no solutions for Linux. Macintosh users with the M1 processor can write software on CCS. Macintosh computers with the M1 processor, because there are no OS drivers However, there is no solution to running Keil on the new There is a way to install software on older Macintosh computers so WindowsĪnd its applications will run on the Macintosh, see running Keil and TExaS on a Macintosh. These programs only run on Windows 10 or 11. Spring 2023 example code has been tested with Keil uVision IDE version 5.38a, KiCad library and starter files to be used in ECE445L Here are notes from someone named Carl Sanders who worked with a team of engineers to help develop this RFID chip: It is amazing how accurate the Bible is concerning the implantable RFID microchip. If this mark was purely spiritual, it would indicate both places, or one-not one OR the other! These verses could not be referring to something purely spiritual as scripture references two physical locations (our right hand or forehead) stating the mark will be on one "OR" the other. This would contradict scripture that states we need the mark to buy or sell! If physical money was still in use, we could buy or sell with one another without receiving the mark. Why's that? Revelation 13:17 tells us that we cannot buy or sell unless we receive the mark of the beast. Speaking to the last generation, this could only be speaking of a cashless society. Let him who has understanding calculate the number of the beast, for it is the number of a man: His number is 666." "He (the false prophet who deceives many by his miracles-Revelation 19:20) causes all, both small and great, rich and poor, free and slave, to receive a mark on their right hand or on their foreheads, and that no one may buy or sell except one who has the mark or the name of the beast, or the number of his name. In the book of Revelation 13:16-18, we will read, Did you know that the Bible foretold of this event almost 2,000 years ago? Whether you believe in God or not, this message is a "must-read"!Īll throughout time, we can see how we have been carefully conditioned to come to this point where we are on the verge of a cashless society. Under the file menu select "Save As" and under the "save as file type" pull down menu, select "Desktop Cutting Plotter" (it is about half-way down.) When it asks you what type output you would like select "Use ROBO-Master type of spline output" and hit OK.Ħ. (under the file menu, select "Open," and open up your SVG.)Ĥ. You can download the most recent version for free here.ģ. Download and install Inkscape if you do not already have it. However, if there are SVGs out there you would like to use with your Silhouette Studio software, here is how you can convert them to DXF and open in Studio.ġ. DXF is a format that you can open, in cuttable format, in the standard version of Silhouette Studio. From here forward I will be posting my files in both SVG and DXF format so my Silhouette friends that use the standard version of Studio can cut them as well. One thing I have learned is that you cannot use SVG files with the standard version of Silhouette software, however, you can convert SVG files to use with Silhouette Studio without upgrading to the designer edition. Yeah for me! I have been playing with the Silhouette Studio software. Have questions, need help or just want to chat? Leave a message below and let's discuss or message me on Messenger.I am awaiting the arrival of my Silhouette Cameo machine. The engineering team is currently working on a fix, so when the next update is available, all of this will be behind us. It takes a little time, but so much better than not being able to cut or having to trace png files all day. Install the legacy version 4.1.206 of Silhouette Studio® from (Make sure to select on the arrow next to "Legacy" to view legacy versions).Īfter the install finishes, open a DXF in Studio to make sure your loopy messes are gone. Install Time: Install your fresh version of Studio and test a DXF. Once successfully removed, re-start the computer.Click on the Remove or Uninstall option.***NOTE: Removal should not affect the library or license key (if present) *** Drag ALL instances of Silhouette Studio to the Trash.Select the Gomenu at the top of the desktop.Here are the directions for Mac and Windows Silhouette provided: Right click on Local User and Export 'Local User.' From the popup pick a spot on your computer to keep it, like your desktop or folder that you store your DXF files in.Ĭlean Uninstall: We need to make sure every spec of 4.1.468 is gone. Go to File -> Library and you'll see the screen below. In that case go back one more to 4.1.201.īut hang on! Before you start uninstalling there are a couple things you need to make sure to do.īack up your Library: Once it's gone, there's no way of getting it back, so even if your not deleting it, backing up your library is always a smart move. Currently their most stable version is 4.1.206 unless you're running a machine with Mac OS High Sierra (the current version) and you need to use Bluetooth to connect to your machine. The official recommendation of Silhouette America for DXF users at this point is to roll back your software. how do I fix this mess? I just want to cut! Here's what this part would look like after running Smooth if the loops weren't there: (To make it quicker, make sure to compound path all of your pieces first otherwise you'll have to select every piece one at a time.) If the loops weren't there you could select a shape and click Smooth in the top menu to delete all of those extra points. You can see there are still a bunch of tiny loops. This is the same file from the first image with five times the points added: Usually we fix this by adding more points to the shape before saving it as a DXF, but this time around no matter how many points you add, smaller curved areas are still going crazy. All of a sudden you're pretty four point circle is an ugly polygon. That's why sometimes you'll see a curved piece open up in DXF format as a bunch of straight lines put together. So what's causing the issue to begin with? According to Silhouette something went wrong in the current version's rendering of DXF's. You see, DXF files lack the ability to draw curves. So if this has happened to you, delete the old DXF files and unzip your zip files for fresh ones after following the steps below. I also found someone with the same issue who reopened their files in Inkscape and had the mess follow them back. As soon as I upgraded to version 4.1.468 while on chat with a representative from Silhouette, BAM! squiggly messes and choppy lines everywhere! Yikes! Well it ends up it was because I was still running Studio version 4.1.206. Every time I opened one of these files it looked like it should have, so what the heck?!? Could not figure out what the heck was happening. I gotta tell you, this one bugged the heck out me. Three times in the last three weeks I've had customers send me pictures like this: Banish Twisted, Looping, Messy DXF Files Caused by the Studio 4.1.468 BugĪlright y'all. If you don’t have a copy already, you can download a free Photoshop trial here.If you’re a designer, you probably know that creating stunning typography can be a time-consuming and, at times, challenging task. Please share this tutorial or pin it on Pinterest. That completes the neon light effects tutorial. This will give the glow some extra oomph. Now once again with a very soft, round brush set to about 20% opacity – draw on the spiral. Create another layer called Extra Spiral glow and use the same settings as in Step 7. Instead of adding a red glow, I’ve added a yellow glow but all of the other settings for the outer glow layer style are the same.ġ2. Now add a glow to the Spiral layer in the same way you did in step in Step 5. Select the eraser tool and erase alternate sections of the line so that the line appears to go behind Superman as well as in front.ġ1. However, we want to give the impression that the line is wrapping around Superman rather than just appearing in front of him. This produces a nice clean spiral in front of Superman. Then on the Paths panel, click on the Stroke path with Brush.Ĭlick here to read a tutorial on how to use the Pen Tool In Photoshop.ġ0. When you’re happy with the spiral, set your paintbrush to a hard, round, size 9 brush. Use the Pen tool to draw a spiral shape across superman’s body. Create a new layer and name it “Spiral Glow”. The next light effect I wanted to add was a bright orange glow around Superman. This will produce a nice, more authentic looking glow.ĩ. Start to paint around each of the letters in the word super. Select a very soft round brush and set the opacity of the brush to about 20%. You won’t see any change yet because there is nothing on that layer yet – that’s our next step.Ĩ. This needs to be smaller – in my case I set it to 51px. Drag that layer underneath the Super text layer.Īpply a layer style again – choose Outer Glow – leave all the settings the same as before EXCEPT the Size. To make it look like the individual letters have a light effect applied to them we need to add a little more glow.Ĭreate a new layer and name it “Extra Glow”. So now we have a bit of a glow coming from the word Super.ħ. Set the Spread to 0% but give a fairly large size – this is something you can play around with to get the effect you like. Set the Blend Mode to Screen, Opacity to 100% and choose whatever colour you would like your light effect to be. With the new Super text layer selected in the Layers panel, click on the “add a layer style” button on the layers panel and choose Outer Glow from the drop-down menu. The colour is white and the font used here is called MA Sexy and it has a nice loopy handwriting feel about it. Using the Move tool, move Superman in the “Cutout” layer down to the bottom left of the image.Ĥ. To make the light effects stand out a bit more, add a black background underneath the cutout layer, by creating a new Layer in the Layers panel and filling it with black paint using the Paint Bucket tool. Once you’ve made your selection, hit Ctrl + J (Windows) or Cmd + J (Mac) to add your selection to a new layer. On this particular background, it’s easy to select Superman using the magic wand and then do a little bit of tidying up using the quick mask. The first thing to do is separate Superman from his background. I’m using this picture of Superman which can be downloaded from .Ģ. In Photoshop, open the image you want to apply the effects to. If you’re a beginner getting started with Photoshop, you’ll learn how to use layer effects to create an eye-catching neon effect.ġ. You’ll notice that the Photoshop interface looks a bit old in the screengrabs, as does the actor who plays Superman □ There have, of course, been many updates to Photoshop since then, but this method of creating a neon effect still works perfectly well, if you want to try it out. *Update October 2022: I first wrote this Photoshop tutorial for my students, waaaaaaay back in 2008. In many cases, the frustrating bug in question co-occurs with similar pop-up activity involving a handful of other system processes. Enter and confirm the new password to bring credentials back into sync. To do it, open the “Keychain Access” screen once again, right-click “login”, and select “Change Password for Keychain ‘login’” in the context menu. If so, the easy fix is to make sure that the keychain and the system are using the same password. However, this isn’t always the case, and the authentication data for the high-level “login” keychain and for the system might not match. Ideally, the new password should take effect across all the services and applications without any manual action. Also, consider disabling the “Lock after” feature or enter a period of inactivity longer than the default five minutes.Īnother likely scenario where the “accountsd wants to use the login keychain” pop-ups start flooding the system stems from a change of the macOS user account credentials. When this drag kicks in, the workaround is to open the “Keychain Access” app from the Mac’s “Utilities” interface, right-click the “login” entry in the sidebar, choose “Change Settings for Keychain login”, and deselect the “Lock when sleeping” option if the box next to it is checked. The possible correlation between these two occurrences is as follows: system tweaks may cause this keychain to be locked, although they shouldn’t. The “accountsd wants to use the login keychain” pop-up problem often appears after macOS updates – either major or supplementary ones. If the utility spots malicious code, you will need to buy a license to get rid of it. Download Now Learn how ComboCleaner works. This way, you may reduce the cleanup time from hours to minutes. Therefore, it is recommended to download Combo Cleaner and scan your system for these stubborn files. “Accountsd wants to use the login keychain” virus alert may re-infect your Mac multiple times unless you delete all of its fragments, including hidden ones. At some point, though, this synchronization may stop functioning the way it should. On a side note, the iCloud account is added to this list automatically. To make this awesomeness happen, the user should head to Internet Accounts under System Preferences and enroll the frequently used services there. This bilateral harmony is a prerequisite for seamlessly accessing the native and third-party utilities without the need to enter authentication details off and on. It is a system service geared toward ensuring that the installed applications and the Mac user’s accounts are acting in concert. For clarity’s sake, it’s worth diving into the essence of the accountsd entity first. Let’s start with the non-malicious facet of this problem. This ambiguity applies to the issue where pop-up alerts saying “accountsd wants to use the “login” keychain” are repeatedly displayed on a Mac computer. To top it off, sometimes it’s problematic to differentiate between malicious or benign catalysts for such activity, which hampers the process of accurately diagnosing the root cause. That being said, warnings that are caused by bugs or inconsistencies at the level of the operating system seem to be the lesser of two evils, but they are equally frustrating. With the ubiquity of potentially unwanted or outright harmful Mac applications in the wild, there are plenty of hypothetical situations that can undermine or ruin the user experience through annoying pop-ups within or outside a web browser. Update: February 2024 What is the “accountsd wants to use the login keychain” alert? Here is how to stop an influx of pop-up alerts on Mac saying “accountsd wants to use the login keychain”, which can be a sign of misconfiguration or malware.
|
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |