7/31/2023 0 Comments Van halen bumblebeeBumblebee remains a longtime favorite for Van Halen listeners everywhere. "Bumblebee," as it would come to be known by fans, debuted on the cover of the 1979 album Van Halen II and was heavily played by Eddie throughout the 1979 world tour.Īlthough Eddie continued to wrestle with the overall capabilities of the guitar, the black-with-yellow-stripes theme became insanely popular. After all these modifications, only the original body, striped paint job, screw-eye strap hooks and Schaller® tuners remained from the first version of the guitar. He also swapped out the chrome volume knob with a Strat-style skirted "Tone" knob. He instead outfitted the instrument with a prototype two-point Floyd Rose® bridge and locking nut with retainer bar, becoming the first professional rock guitarist to use a locking-nut tremolo system. He rewound the pickup by hand, dipped it in paraffin wax and put copper tape around the windings.Įddie also stripped out the original Charvel bridge, leaving its six screw holes behind. After selecting a DiMarzio® Super Distortion humbucking pickup, he swapped out its ceramic magnet for an alnico 2 magnet from a Gibson® PAF. He installed a new Boogie Bodies maple neck with a natural headstock, unfinished back (which he has always preferred) and 12"-radius dot-inlay maple fingerboard. While pleased with the looks of the guitar, Eddie was less impressed with its tone and quickly began tinkering with it, as he was prone to do. Other features on the first-incarnation guitar (as pictured on Van Halen II) were a standard nut, single Mighty Mite® humbucking pickup with transparent bobbins, single chrome volume knob, original Charvel® six-screw brass tremolo bridge, and Schaller® tuning keys. He tasked Wayne Charvel to make the original guitar, which had a maple neck, maple fingerboard and dot inlays. During the process of recording 1979 album Van Halen II, Eddie Van Halen sought something fresh to play other than his original "Frankenstrat," which at the time was being heavily copied by just about every major guitar company in the world.Įddie had the idea to build a new guitar with an ash body and black-and-yellow-stripe paint job, with rear-loaded electronics so there would be no pickguard. This run was handsigned by Eddie van Halen. These days you don’t have to play is a suite of Van Halen signature amps that don’t require anything like that to get that gain.Here is a mint condition all complete ultimate collectable. You can, of course, wreck your amp if you are not careful but this was Van Halen improvising once more, making discoveries as he went. The working theory goes that at lower voltages the amp was quieter and had warmer, more saturated distortion - the same principle is at play with Fuzz pedals, such as the eponymous Variac Fuzz from MXR, where choking the voltages gets a more extreme breakup. He used a variac transformer to lower the output voltages for his amps, an epiphany he had after getting British Marshall that was wired for the U.K.’s standard voltage of 230V. But those old Marshalls often had their own peculiarities when it came to circuitry. Legends have grown about what sort of mods were made, but those who have worked on Van Halen’s Marshalls - such as Dave Suhr - have noted only the most minor changes. In the beginning it was Marshall Super Lead 100-watt heads and lots of them. Now a subsidiary of Fender, producing an expansive lineup of signature Van Halen guitars such as the Wolfgang, amplifiers, and effects co-developed with MXR, EVH Gear is the first place very much a one-stop shop for any player looking for some of that atomic punk mojo. Perhaps it was inevitable that Van Halen’s tone chasing would one day culminate in him steering the development of his own brand, EVH Gear. He had a Kramer doubleneck, too, and signature models with Ernie Ball Music Man and Peavey. Van Halen would use his Kramer signature S-style, which applied a similar red, black and white finish to the Frankenstrat but with the hockey-stick headstock. It makes his Ibanez Destroyer 2459, aka the Shark, look tame. Check out the DragonSnake he was brandishing on the cover of Guitar World back in ’81. A true seeker has got to keep an open mind. Nothing was off-limits a Danelectro neck on a Charvel body? Well, why not? Whatever works. Used throughout the touring for Van Halen II, it was built by Charvel and finished in black with yellow stripes, with a rudimentary locking vibrato for dive-bombs and a DiMarzio humbucker in the bridge. In 1979, Van Halen took receipt of the Bumblebee.
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Size of the phonebook grows, the speed gains increase (we get a 557x speedup In other words, the set algorithm gave us a 267x speedup! In addition, as the Log n) can be: > % timeit list_unique_names ( large_phonebook ) 1 loops, best of 3: 2.56 s per loop > % timeit set_unique_names ( large_phonebook ) 100 loops, best of 3: 9.57 ms per loop Unique first names, we see how drastic the difference between O(n) and O(n When timing these two algorithms using a phonebook with 10,000 entries and 7,422 Loop over the phone book, making this algorithm perform in O(n). The only nonconstant contribution to the complexity of this algorithm is the Will cover while discussing the implementation of dictionaries and sets). Of how large the phone book is (there are some minor caveats to this, which we Is an O(1) process that completes in a fixed number of operations regardless On the other hand, the set algorithm has no inner loop the set.add operation N), since the outer loop contributes the O(n) factor, while the inner loop Thus, the complete algorithm performs as O(n log Linear search for each name in the phone book over a list The list algorithm’s inner loop iterates over unique_names, which starts outĪs empty and then grows, in the worst case, when all names are unique, to be the Because sets guarantee the uniqueness of the keys they contain, if you try to add an item that is already in the set, that item simply won’t be added. We then continue through the list, performing this step for every item in the phone book.įor the set method, instead of iterating over all unique names we have already seen, we can simply add the current name to our set of unique names. If it is a new unique name, we add it to our list of unique names. Here, we must check the current name against all the unique names we have already seen. We must go over all the items in our phone book, and thus this loop costs O(n). Through the entire list to find the phone number we required, as shown in With lists, we would store the phone numbers and names sequentially and scan Simple to answer the question, “What is John Doe’s phone number?” in the future. We would like to store this in a form that will make it Say we want to store contact information for everyone If the hash function is slow to evaluate, then any operations onĭictionaries or sets will be similarly slow. Insertions/lookups is O(1), the actual speed depends greatly on the hashing function that However, there is a cost to using dictionaries and sets. The use of an open address hash table as the underlying data structure. As we will see in How Do Dictionaries and Sets Work?, this speed is accomplished through Lists/tuples, dictionaries and sets have O(1) insertion time. Lists/tuples with no intrinsic order (through a search operation), dictionariesĪnd sets give us O(n) lookups based on the arbitrary index. While we saw in the previous chapter that we are restricted to, at best, O(log n) lookup time on Hash Functions and Entropy for more details. These, and any user classes have default values. All native types in Python already implement A hashable type is one that implements both the _hash_ magic function andĮither _eq_ or _cmp_. 7/31/2023 0 Comments Weechat messengerYou’ll be amazed to know that out of the total number of WeChat users, more than 1 billion are said to be living in China itself. More than 1 billion registered WeChat users live in China.Īny guesses about the current WeChat user stats in China? Surprised? You ought to be! It is, undoubtedly, one of the most used messaging apps globally, just behind Facebook Messenger and WhatsApp. There is no denying the fact that the number of active users of WeChat is over 1 billion every month. WeChat boasts of having more than 1 billion active users every month. And it also shows how more and more people are using this messaging app to stay connected during the COVID-19 crisis.īut wait, there are more surprises in store for you! 2. This has been confirmed by the WeChat statistics for the first quarter of 2020. Just pause and ponder these figures for a minute.īelieve it or not, the latest WeChat user stats show that there are around 1.17 billion users. There are a whopping 1.17 billion users, usage stats for Q1 2020 show. These will show the increasing significance of this messaging app and how it has already taken the whole world by storm! 1. Now let’s get started with a couple of interesting and vital WeChat stats. WeChat boasts nearly 410 million audio and video calls per day.WeChat is positioned to be the number one hub in the social media ecosystem of China.Every day, WeChat users send nearly 205 million video messages.It is the fifth most widely used social networking app in the world.WeChat Pay had nearly 800 million users in Q4 2019.Nearly 1 billion registered WeChat users live in China.WeChat has 1 billion monthly active users.There are a whopping 1.17 billion users as of Q1 2020.Wanna know what leads to more and more people using WeChat for messaging? Let’s take a look at these amazing facts here and now: Fascinating Facts No wonder that the popularity of WeChat is increasing, and it is regarded as one of the most widely accepted modes of communication in China. No other messaging apps can equal the fame that this app has won in such a short period of time. The latest WeChat statistics show that it has a whopping 902 million daily users. To begin with, after its initial launch back in 2011, WeChat was already ruling the roost in China. The number of WeChat users is growing, and it is rising on the popularity charts at an immensely fast rate. Have you ever wondered what is it that made WeChat an instant hit among mobile users in China? 7/31/2023 0 Comments Large parabolic reflectorProfessionally skilled in prototype jobs, small part quantities & large production runs. diameter, maintaining rigorous tolerances up to plus/minus. Capable of metal spinning blanks up to 72 in. Flexible craftsmanship displayed in materials such as inconel, hastelloy, titanium, stainless steel, steel (cold rolled & hot rolled), aluminum, copper & brass. The use of the sensor on ESA space missions is planned for the late 2020s.An industry certified in metal spinning of parabolic reflectors, CNC metal spinning of parabolic reflectors, spun tubing of parabolic reflectors, precision shape forming of parabolic reflectors & deep drawing of parabolic reflectors. ASTRO® XP consists of an electrical unit and an optical head, for which asphericon was able to manufacture complex mirror optics and a spacer. In addition to autonomous determination of their position, size, weight and temperature resistance are the most important requirements for modern star sensors. With a measurement accuracy of 0.1 arc seconds, ASTRO® XP is ten times more accurate than existing sensors and its innovative optical design also makes it extremely lightweight. On behalf of the European Space Agency (ESA), the company Jena-Optronik developed a novel sensor for autonomous attitude and orbit control of satellites and probes in space. Ultra-precise optics for a star sensor Customer Reference Learn more about our manufacturing capabilities. The achievable roughnesses are, depending on the material and shape, up to 0.5 nm Rq. Thanks to optimized production technologies, high-end finishing such as asphericon ION-Finish TM and Magnetorheological Finishing-Technology® (MRF) as well as high-precision, full-surface and non-contact measurement asphericon manufactures aspheric and parabolic mirrors of the highest quality.ĭepending on the requirements of our customers for aspheric mirrors and aspheric reflectors, accuracies of up to 50 nm global form deviation (irregularity) or 25 nm RMSi are achieved. fused silica, as well as germanium, silicon, zerodur, infrared glass and calcium fluoride. The material is selected according to the customers needs, with the range covering almost all types of glass, e.g. Space exploration and attitude determinationĭepending on the material used, both CNC technologies of grinding and polishing, as well as diamond turning, are used in the production of aspherical on- and off-axis optical mirrors as well as reflectors.Earth Observation with Satellite Cameras.Reference: aspherization of Fizeau interferometry.Reference: Telescope lenses for PHELIX high-energy laser.Reference: Beam shapers for square top hats in the focal point. Reference: Beam Shaper for laser welding.
For one thing, it’s its own distro with its own package manager (Pakfire) which can be used directly or behind the scenes to install extra functionality. But its functionality can be extended far beyond what’s in the box. IPFire has everything you need and more to run an advanced firewall solution. (Image credit: Tom's Hardware) IPFire Add-ons Click update and then you should be able to connect to IPFire’s web interface from anywhere on your LAN.įirewall rules look simple with IPFire, and the IPFire interface looks lovely in the Ubuntu 20.04 daily images. In the Additional settings box, you can choose to log, limit, or rate limit these connections, but we won’t trouble ourselves with that, so just click Add. In the Protocol section choose TCPm select Any in the Standard networks drop down and in the Source section enter 444 in the External port box. In the Destination section select the Firewall option and choose GREEN – 10.0.0.1. Check the Use NAT box below and choose Destination NAT. In the Source section, select the Standard networks option and choose RED. Go to Firewall > Firewall Rules and click the New rule button. This is not something you’d want to do in real life, but it serves to show the procedure for adding rules. We’ll set up a simple rule to allow the Red network to access the web interface on the host. Uncheck the Use ISP-assigned DNS box, and click the Add button at the top. This you can do, by heading to Network > Domain Name System. You may wish to use a public service for this, such as CloudFlare’s 1.1.1.1 or Google’s 8.8.8.8. Then you’ll be presented with IPFire’s intuitive web interface.īy default IPFire forwards DNS requests to the DNS server on the Red Interface, which is probably your ISP, via your home router. The next thing you’ll see is a login box, into which you should identify yourself as admin using the password you set up earlier. The first thing you’ll see is a nasty security warning because IPFire uses a self-signed certificate. You should be able to connect to IPFire by browsing to. This should be all you need to complete the initial setup of the IPFire instance. (Image credit: Tom's Hardware) Testing, Configuring DNS on IPFire Once we set up our Ubuntu VM to use a static IP, we were able to connect to our IPFire VM. For a physical machine, you can connect to the Green interface IPFire host either by direct cable connection (older 100mbit cards require a crossover cable, gigabit ethernet cards do not) or via a switch. For desktop distros, this is most easily achieved by setting a static IP configuration in Network Manager. So you’ll have to set up Static IP addresses for the VMs you want IPFire to protect here. If you’re using libvirt or Virtualbox, this won’t work since the virtual NAT device has its own DHCP server which will get in the way. Turn this on and use the following settings (or something like them): Start address: 10.0.0.2 Unless you want to mandate that everyone using your private network must use Static IP, the Green interface will need a DHCP server. If you’re running IPFire virtually, then DHCP will use your hypervisor’s NAT network which should work fine. Static IP will require you to set the gateway to that of your home router. The Red interface (in this set up) can be set to receive a IP address via DHCP which offers the easiest set up, but you’ll probably want to configure a static IP later or you’ll be chasing your IPFire instance after a reboot. The Green interface can technically be anything you want, but it’s sensible to use another designated-private IP address such as 10.0.0.1 or (192.168.1.1 if you prefer). In the configuration described above, where we have a secure network ‘underneath’ our home LAN, the Red interface ought to conform to the rest of the LAN with a likely IP address of form 192.168.0.x. IP addresses must be set up for the network devices under IPFire’s control. The idea is that traffic can flow from Green to Red, but not in the other direction. In practice (if you’re not using IPFire on a machine which connects directly to your ISP) these will both connect via your home router ultimately, but your Green network interface will connect (either via crossover cable, wireless or another router switch) to the machines you want IPFire to protect. Typically the Green network will be your private network and the Red network refers to the one connected to the Internet. Use the first option if you need to set up more adapters, and use the second option to assign colors to network hardware. You can use up to four adapters with IPFire, and things get even more colorful if you do that. Setting up Red and Green Networks on IPFireįor a two-adapter setup, we must assign one device the Green network and the other device the Red network. Enter the Settings menu, choose 'Personalization' click 'Colors' and scroll down to the switch marked 'Choose your default app mode'.Ģ. View Deal Changing Chrome to dark mode for Windows 11ġ. Although it's hard to say how much battery savings are up for grabs, it's estimated that you can conserve anywhere between 15% and 60% of screen energy depending on the level of screen brightness you choose while in dark mode - which is pretty impressive! While more research is needed, studies are showing that using dark mode may improve your sleep and cause less disruption to your circadian rhythm than blue light does.īut while Google Chrome dark mode can be set up on some PC operating systems, it's mobile users who will get the most benefits, with switching to dark mode resulting in less energy usage and therefore, longer battery life. Whether you're using one of the best windows laptops or you're more a fan of the best MacBook and Macs, you'll find Google Chrome dark mode super beneficial when you're browsing first thing in the morning or late at night. Fast forward to 2022 and it doesn't matter whether you want to use Instagram in dark mode to scroll through all those jaw-droopingly beautiful images or use YouTube dark mode to watch those must-see videos, it's widely available across all your favorite platforms. While the light reduces, making for a more comfortable reading experience at night, the minimum color contrasts required for readability are still maintained, so you'll get exactly the same experience you would in the day, just with far fewer risks to your eye health.īursting onto the scene in 2016, dark mode first appeared as part of the Windows 10 Anniversary Update, but Apple were quick to jump on the bandwagon with their own launch in 2018 and Google Chrome dark mode dropped in 2021.
I see in this case a surprising and pleasing adequacy of a very simple modelling with reality. “I like the fact that the minimal surfaces I'm studying do indeed resemble the soap films of everyday life. But curiously, the one I prefer and which seems to me to best describe practical soap films, the theorem of the existence of minimisers is not yet known, even for surfaces of dimension 2 in Euclidean space of dimension 3, with an edge that is a smooth curve,” he said. “In fact, there are many ways to give precise meanings to the terms “leaning” and “surface area”, which have resulted in some wonderful pages of mathematics. “It's called Plateau’s problem, which is precisely about having surfaces that rest on a given edge (the wire) and a minimum area,” researcher Mr David explains. In this case, the model consists in saying that these films and bubbles minimise a very simple quantity, the total area, with the constraint of leaning on a given edge, which corresponds to dipping a wire in soap and looking at the surface formed (or containing given volumes in the bubbles). A very good example, studied by Guy David, is the description of soap films and bubbles. And then to study these minimal configurations in detail. Many phenomena are governed by the minimisation of “functionals”, and the main goals of the calculus of variations are to demonstrate the existence of functions, or configurations, that minimise these functionals. What do they most often look like? On plans? With what error estimates? What can we deduce about all kinds of objects associated with these sets? It is also one of the main tools of the “calculus of variations”. One of the useful tools for the study of harmonic measure is the so-called geometric measure theory, a way to study in detail the regularity of sets in Euclidean space. The study of harmonic measure proved to be fascinating here, and also allowed a better understanding of certain problems that remained unaddressed in the classical case of Laplace's equation. The Brownian motion analogue is thus pushed towards the edge (otherwise it could pass by without seeing it!). With two other researchers, Guy David has introduced a different class of elliptic operators, adapted to domains with a much smaller boundary. Significant progress has recently been made. The way air moves (Brownian motion) is then governed by a simple partial differential equation, Laplace’s equation, which is a good model of what are called elliptic equations,” he says. In this case, the so-called harmonic measure describes the part of the lung that can be reached by air. “The question is whether the air, whose movement is described by a Brownian motion, can reach all parts of the lung or only a small part. “The lung is made to have the largest possible surface area, to allow maximum exchange between oxygen and carbon dioxide, and therefore has a multitude of cavities,” Guy David explains. A small particle of air enters it and the question is how far it reaches inside the lung. The study of the relationships between the geometry of a domain (the inside of the lung) and harmonic measure (the distribution of air at the interface) is one of the great classics of partial differential equations. If we know the air pressure on Earth at a given time, then we should be able to tell the pressures for all other times.” From there, mathematicians ask themselves three questions: Do their equations describe the nature around them? Will they be able to solve them? And once these two steps have been taken, will they also be able to resolve them practically? Harmonic measure “It is common practice, for example, to describe the weather with variables such as air pressure or temperature. “Partial differential equations represent the way we model nature,” Guy David says. The French Academy of Sciences has just awarded him the 2020 Ampère prize. Today, he is mainly interested in a concept of harmonic measure adapted to domains with small edges. His recent research concerns, for example, the theoretical description of soap films. He teaches in the Mathematics Department of the University. He is studying the geometric theory of measure, calculus of variations and partial differential equations. Guy David is a teacher and researcher at the Orsay mathematics laboratory (LMO - Université Paris-Saclay, CNRS). 7/30/2023 0 Comments Whatsapp app install downloadUnlike some other mods, TMWhatsApp is totally ad-free which saves over 45% of your mobile data bundles (mbs) when running the app. Ad-Free:Īpps with ads consume alot of bandwidth or data. Making it the only all-in-one WhatsApp mod ever. TMWhatsApp is a combination of all the amazing features of WhatsApp+, YoWhatsApp, and GBWhatsApp. Here is how TMWhatsApp measures up: Features Well, being clones they all work and look exactly as usual WhatsApp only that their features are more advanced. Now that it has stood its ground, the obvious next question is: how does it compare with Other Mods like GBWhatsapp. The case is different for TMWhatsApp which gets updates as frequently as nobody could ever imagine. The biggest problem with most mods is that they do not get updated whose upshot is poor performance accompanied by unending bugs and crashes. This mod has defied all odds and is outstanding in the way it dispenses features. In that sea of failure, a clone app has been built successfully and it’s known as TMWhatsApp. TMWhatsApp vs GBWhatsApp: Which App Has the Best Features? How to download TM WhatsAppĭownload the Latest Version of this application from the link below and also have a look at how it weighs up with GBWhatsapp today.
7/30/2023 0 Comments Dordogne region two speciesAfter this, only sparingly has it been observed by science. Illustration of a Type D male and female (© Uko Gorter)įound in the Southern hemisphere, the Type D has first been described in a mass stranding event in New Zealand in 1955. Then there’s the almost ridiculously small eye patch, which is a great way to identify this type of orca. The dorsal fins are more pointed and less prominent. They lack a snout and the heads are more blunt. Type D’s, on the other hand, differ substantially in terms of morphology. Then there are the Types B (divided in a large and small form) and C, which subtly differ in the shape of the dorsal fin and more obviously in the positions and shapes of the eye patches, saddle patches and colour. The Type A is the quintessential orca people are familiar with. In terms of morphology, Type D orcas are very different from other types in the Southern hemisphere. Analyses of its mitochondrial DNA have given reasons to declare this type as its very own species. There are currently discussions going on within the scientific community, surrounding this type. The most remarkable of these has to be the Type D. Five such ecotypes have currently been described in the Southern Ocean. These ecotypes differ in morphology, diet, behaviour and genetics. Worldwide, orcas are being divided into subspecies, also called ecotypes. I therefore consider myself lucky that I have met these animals. Not many people have seen this unique type of orca with their own eyes. One animal which does indeed deserve this title is a virtually unknown ecotype of the orca: Type D. The rivers and the dams upstream are now a vital resource for those who depend more and more on freshwater supply including agricultural irrigation, energy production, industry and new residential and tourist demands.It’s not often for large animal species to remain a mystery nowadays. With 1.2 million habitants, the Dordogne’s catchment area has a low density (51 inhabitants per km²) comparing with the national average (112 inhabitants per km²).įor around fifty years, the transformation of rural areas in the Dordogne watershed into agricultural land and to recreational spaces has led to a spatial and social reorganization. It has an important variety of fishes (39 species) and it is especially valuable because it is the last refuge of all major diadromous fish of Western Europe. The Dordogne basin is home to a rich biodiversity of plant and animal species remarkable at national and European levels. This ecoregion is characterized by temperate coniferous forests, temperate forests with deciduous trees and Mediterranean woodlands and scrub. The transition is also related to the topographical variations between the mountain area of the source and the alluvial area of the mouth of the river. Given its size, the Dordogne watershed consists of two main biogeographical regions and one transition region: a continental region, located to the east of the basin and characterized by temperate coniferous forests, an Atlantic region in the western part of the basin in Aquitaine, characterized by temperate forests of deciduous trees and finally, between the two regions there is a transition region that is a crossroads of climatic influences and a Sub-Mediterranean and Atlantic floristic area. The river traverses a variety of landscapes and functions - mountains, hydropower, large meanders -before flowing into the Gironde at the "Ambès beak", north of the city of Bordeaux, forming the Gironde estuary, the largest estuary in Europe. Its catchment area is about 280 km in its longest part and 150 km at its widest zone. The Dordogne rises on the flanks of Puy de Sancy (1,658 m) in the town of Mont Dore, from the confluence of two small torrents: the Dore and Dogne.
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