![]() ![]() Image Courtesy of Parallel Flight Technology The hover lift efficiency of Ingenuity is 2.07 kW/kg, about half of the hover lift efficiency of the Parallel Flight Technologies beta aircraft on Earth (4.54 kW/kg), which is remarkable given the fact that Mars atmosphere is only 1% of Earth. Ingenuity uses 350W to hover during flight and weighs 1.6 lbs (0.73 kg) on Mars, while PFT’s Beta uses 26 kW. In terms of size, Ingenuity is 19 inches tall and its two rotors are 48 inches in diameter, while PFT’s Beta is 3.28 ft in height and has four rotors of 40 inches in diameter each. In the case of the Beta version of PFT’s vehicle, the disk loading is 36.4 Kg/m 2 and, in the case of Ingenuity, it’s 0.62 Kg/m 2 on the surface of Mars. In helicopter design, the most important number to determine lift is known as disk loading and is expressed in terms of weight over area (Kg/m 2). We reached out to the Ingenuity engineers at NASA JPL and also to the engineering team at Parallel Flight Technologies (PFT) to compare the specifications of the two vehicles, one designed for flying low weight over Mars and one for heavy lifting on Earth. The two blades counter rotate to eliminate torque at 2,400 revolutions per minute (RPM), creating the necessary lift to counter the weight of the vehicle and fly. The rover weighs 4 lbs or 1.8 Kg (which translates to 1.6 lbs on Mars) and the wingspan of the blades is 4 ft. The exact specs are fascinating given the fact that Mars’ atmosphere has about 1% the density of Earth’s, which means the ratio of blade surface to weight is enormous. Even though NASA does not label the unmanned craft as a drone or UAV, it fits the bill: it flies independently of human interaction, is electrically powered, and uses blades to generate lift. Ingenuity was developed at the NASA Jet Propulsion Laboratories (JPL) in Pasadena, California, and it’s an engineering marvel. Today, we are just weeks away from our first unmanned flight on another planet. Back in 2019 at the SPAR3D event in Anaheim, MiMi Aung, Deputy Division Manager of Autonomous Systems at NASA Jet Propulsion Laboratory, gave a keynote on the challenges of designing a helicopter that would fly on Mars. ![]() On February 18th the National Aeronautics and Space Administration (NASA) landed its Perseverance rover on the surface of the red planet, and, hanging from the belly of the car-sized craft is a small unmanned aerial vehicle (UAV) known as Ingenuity. ![]()
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You can then boot into the “normal” Windows mode. If you find one of them on the list, you can click uninstall and restart Windows. #Parallels access black screen PcSometimes some malware programs are installed along with the applications you need, for example “Conduit” or “My PC control”. ![]() #Parallels access black screen installDid you install any programs recently? You can check your application by date of installation. How are we going to do that? First, try to recall the first time when you saw the black screen. Let’s figure out what we should uninstall first. Then go to Programs and click on “ Uninstall a Program”.Įach individual program may be uninstalled by selecting it from the list and choosing the “ Uninstall/Change” option. We’re all set and can now check the programs list. Here is what you will see after inserting the two commands: We need this temporary effect just for checking our programs and removing some of them if needed. But no worries-your default settings will be back right after Windows restarts. Will these commands change Windows registry settings? Yes. REG ADD “HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\MSIServer” /VE /T REG_SZ /F /D “Service” Now we can execute a few commands to remove any programs. Seeing a new black window? Good, you’re on the right path. Right-click on the “ Command prompt” at the top and choose “ Run as administrator”. To start it, we need to click the Windows Start button and type “ cmd” in the Search box. We can do that by using the Command prompt utility (similar to Terminal on your Mac). So, if we can’t remove programs in Safe Mode, how do we remove this program? We need to turn on the “removal” functionality in the Safe mode. As I mentioned before, the possible reason behind a Windows black screen is third-party programs and sometimes malware. One of the differences is that there is no option to remove programs in Safe Mode. Safe mode is quite different from the “normal” Windows mode. You will be presented with the following options: Now, start Windows and press the F8 key before the Windows screen comes up. In your virtual machine configuration, go to Hardware, select Boot Order and put a checkmark next to Select boot device on startup. #Parallels access black screen how toHere’s how to fix it:įirst, start Windows in Safe Mode and check how it goes. But when you try to start Task Manager or anything else on Windows, you don’t see any changes on your screen. The symptoms are pretty much the same: black screen with a mouse cursor. The second potential reason for the Windows black screen is third-party application issues. Cool, right? By the way, you can use these steps on your Windows PC as well-not only in a virtual machine. We’ve just reviewed a few simple steps that can fix one cause of the black screen in Windows. Now we can choose Task Manager and check the Explorer in the Process tab.ĭon’t see it there? Restart it by clicking File → New Task:Īfter performing these steps, the Start panel and all of your icons should appear and you will be able to continue working in Windows. Let’s check the explorer process in Task Manager by clicking Devices → Keyboard → Alt Ctrl Delete: Basically, you’re working in a program on the Windows side, make a few clicks left and right and…all you see now is the empty black desktop with your mouse cursor: The first and simple scenario in which the black screen can pop up is the incorrect work of the “explorer” process. #Parallels access black screen for macI will be using Parallels Desktop for Mac with Windows 7 and XP virtual machines for the tests. So, let’s see if there are some common cases when Windows goes to the black screen and if there’s any way to fix it. Needless to say, it took a while for me to do that, but now we’ve got some shiny screenshots and thorough instructions! How about that? In order to test a few fixes for the Windows black screen issue, I performed real tests with live configurations. ![]() Don’t rush to trash your poor virtual machine just yet-instead, we can try to fix it. Sound familiar? What can I say? That’s sad! But it’s not over. For instance: one of the worst-case scenarios is when Windows gives you the black screen. I could install special utilities, or just additional programs…īut this customization could result in some issues with the operating system. Sometimes I just add more RAM and CPU for the performance needs, or change the internal settings of the system. #Parallels access black screen softwareOnce new software is installed on a Mac, some folks just start using it with the default settings, but others (and I’d say I’m one of them) optimize it by changing various settings. Some people are tech-savvy, and some aren’t. Guest blog by Maria Golubeva, Parallels Support Team ![]() ![]() ![]() Often, the sauce is strained before serving. In some versions of sauerbraten, ginger snaps are crushed and added to the sauce as a thickener while other recipes may call for sour cream to be used. When the meat is done, the liquid is used to create a pan sauce, usually by reducing it and thickening it. In both cases, the meat is seared in a pan on the stovetop prior to braising it in the liquid (in the oven). ![]() Most often, the meat is braised in the marinade, but some recipes call for the marinade to be discarded and a fresh mixture of stock, water, and wine be used as the braising liquid. The meat is soaked in the marinade for several days in the refrigerator, and often it may be left for a week or longer.Īfter the meat is marinated, it is ready to be cooked. You can substitute spaetzle or gnocchi for the egg noodles. Seasonings for the marinade may include cloves, juniper berries, carrots, onions, celery, bay leaves, and peppercorns. This combines the two, without the long marinating time the traditional beef dish requires. Vinegar and a sweet syrup, beer and water, or olive oil combined with an entire bottle of red wine, are only a few of the combinations of ingredients that may be used for the liquid portion of the marinade in the many variations of Sauerbraten. Add meat and buttermilk and refrigerate for 3 to 4 days. The marinade mixture for Sauerbraten varies with the particular recipe. Place the vinegar, water, bay leaves, cloves, celery, carrots, quartered onion, salt and pepper in large plastic container. This is a sweet and sour marinated pot roast with homemade German. Expensive, naturally tender beef cuts from the loin or rib should be avoided because the meat will not hold up to the extensive tenderizing process of this dish: the meat may fall apart easily and become stringy as a result. Special this evening is Sauerbraten mit Spaetzle und Rotkohl made by Chef Patrick. Since the meat undergoes an intensive tenderizing process because of the marinating and braising procedure, inexpensive cuts of beef are the best choices for Sauerbraten (which means sour roast meat in English). This is a sweet and sour marinated pot roast with homemade German pasta and red cabbage. Beef is most often used especially cuts from the round, plate, flank, chuck, or brisket. Special this evening is Sauerbraten mit Spaetzle und Rotkohl made by Chef Patrick. A famous dish of German origin in which meat is marinated in a sweet and sour mixture for several days and is then braised for several hours in the marinade, producing meat that is very tender and flavorful. ![]() ![]() The target used is DVWA (Damn Vulnerable Web Application), which is running locally in a docker container.Įlinks is a console-based web browser that can be used to browse through websites from the command line. #ELINKS COMMAND HOW TO#In the following lines we will see how download files from the terminal, using any of the following five tools available for Ubuntu.In this little tutorial, I demonstrate how to use mitmproxy and elinks to exploit a vulnerable web app completely from the command line. These are:Įast client to download torrents It will allow users to download from the command line with low resource consumption. #ELINKS COMMAND INSTALL#The terminal will be the user interface.įor, install rTorrent package, we will only have to open a terminal (Ctrl + Alt + T) and use the following command: rTorrent It does not have a GUI, it is only available in CLI. Once the installation is finished, we can check if rTorrent has been installed correctly typing in terminal: rtorrentĪfter running the above command, a screen like the following should appear. Now we can start downloading any torrent by pasting the link. ![]() To exit the rtorrent application, the key combination to use will be Ctrl + q. #ELINKS COMMAND FREE#This is one free tool that allows downloading of content from web servers in a simple and fast way. This name comes to mean: get from the #Elinks terminal free# Now you can start download any file we need with the wget command next to the link, and it will start downloading immediately. In case you need download multiple files with wget command, we will have to create a new text file and inside write all the URLs of the files that we need to download. ![]() #ELINKS COMMAND SOFTWARE#Then you just have to use the file name together with the wget command as follows: wget -i listado-descargas.txt Using curlĬURL is a software project consisting of a library (libcurl) and a shell (curl) oriented to file transfer. Supports protocols FTP, FTPS, HTTP, HTTPS, TFTP, SCP, SFTP, Telnet, DICT, FILE, and LDAP, among others.įor, install curl command, you have to use the following command in the terminal (Ctrl + Alt + T):Īfter the installation, to Download a file We must write the URL of this together with the curl command, as follows: #Elinks terminal software# In case we need download multiple files with curl command, you just have to use the command as follows: curl -O URL-del-archivo1-a-descargar -O URL-del-archivo2-a-descargar Using w3m Usually, makes the pages as faithful as possible.įor, install w3m, we just have to open a terminal (Ctrl + Alt + T) and use the following command:įor, start browsing a url, we will have to use the following command: It looks a lot like Lynx and has support for tables, frames, SSL connections, and even images. Then we can browse the website and download what we need. We will do this by hovering over the file with the arrow keys and pressing Intro.Įlinks is a console web browser. Is text-based and focused for UNIX-based operating systems.įor, install elinks package, we can open a terminal (Ctrl + Alt + T) and use the following command: sudo apt install elinksįor, start browsing a website, just use the following command:Ī welcome screen like the one below should appear. We will have to press OK to continue, and start browsing to the file that needs to be downloaded.Īs you can see in the previous screenshot, this browser will offer us several options about the selected file. ![]() One of them is Save, which will allow us to save the file that interests us.How amazing it would be if you surf the internet merely on a terminal. It is indeed exciting then why not learn how to install a browser in the terminal. ![]() There are several browsers available to use in terminals, but I picked elinks for you today because of its fabulous performance. I will show you how to install elinks on your Ubuntu 20.04 LTS machine. ![]() |
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