However, Filo and Yang insist they mainly selected the name because they liked the slang definition of a "yahoo" (used by college students in David Filo's native Louisiana in the late 1980s and early 1990s to refer to an unsophisticated, rural Southerner): "rude, unsophisticated, uncouth." This meaning derives from the Yahoo race of fictional beings from Gulliver's Travels. The term "oracle" was intended to mean "source of truth and wisdom", and the term "officious", rather than being related to the word's normal meaning, described the many office workers who would use the Yahoo database while surfing from work. The term "hierarchical" described how the Yahoo database was arranged in layers of subcategories. The word "yahoo" is a backronym for " Yet Another Hierarchically Organized Oracle" or "Yet Another Hierarchical Officious Oracle". The "" domain was registered on January 18, 1995. In March 1994, "Jerry and David's Guide to the World Wide Web" was renamed "Yahoo!" and became known as the Yahoo Directory. The site was a human-edited web directory, organized in a hierarchy, as opposed to a searchable index of pages. In January 1994, Yang and Filo were electrical engineering graduate students at Stanford University, when they created a website named "Jerry and David's guide to the World Wide Web". For a chronological guide, see Timeline of Yahoo! Founding Jerry Yang and David Filo, the founders of Yahoo The Yahoo home page in 1994, when it was a directory.
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That will finish off the details for this jack-o-lantern, but you could also add some details of your own to spice it up. This will be drawn with a combination of curved and rounded lines, and it will be drawn in such a way as there are two square teeth at the top with one at the bottom. Finally, we will be giving the jack-o-lantern its leering mouth. They will also have lines drawn vertically down them to give them some depth.Ī similar triangle can then be used for the nose, except it will be much smaller. These will be made up of some rounded triangles. To draw the face, we shall start with the eyes for now. Without a spooky face on it, this would just be a regular pumpkin! We don’t want that for this drawing, so we shall add a face in this step of our guide on how to draw a jack-o-lantern. Step 5 – Now, you can finish off the face and final details You can finish off the stalk with some thick line details inside of it for some extra details. This circle will also have a swirl shape inside of it. At the end of it, you can draw a circle to show where it was cut off. This stalk is quite thick, and it bends at a sharp right angle. This step of our guide on how to draw a jack-o-lantern should be quite a simple one for you! All you will need to do for this one will be to draw the stalk. That’s all there is to it for this part, and now you’re ready for the third step! Step 4 – Now, draw the stalk of the jack-o-lantern You can also add a leaf to the top of the jack-o-lantern in this part as well. The top of it will also have some sharp lines extending down into the jack-o-lantern, much how like the lines extended up from the base earlier. Now that you have most of the outline of your jack-o-lantern drawing done, you can finish off the top of it in this next step. Step 3 – Finish off the top of the jack-o-lantern Some of these lines will extend into the interior of the pumpkin in order to form the segments of the pumpkin.įor now, we will be leaving a small gap at the top of the jack-o-lantern, as we will be adding some details there later. This second step of your jack-o-lantern drawing will be all about creating the base of the pumpkin.Īs you can see in the reference image, we will be using some curved lines connecting to one another at the base. Step 2 – Draw the base of the jack-o-lantern As you can see in the reference image, there will be some more lines at the top of the one on the right as well, which will later form the leaf.Īlso, there will be a large gap at the top and bottom of the pumpkin outline. This outline will consist mainly of two rounded lines mirroring each other on the left and right. In this first step of our guide on how to draw a jack-o-lantern, we will be focusing on the outline of the pumpkin. How to Draw A Jack-O-Lantern – Let’s Get Started! Step 1 This step-by-step guide on how to draw a jack-o-lantern will show you that drawing one doesn’t have to be a scary experience. It can be a lot of fun getting into the Halloween spirit by learning how to draw a jack-o-lantern!īy the end of this tutorial, you will be able to do just that. One of the most recognizable symbols of Halloween is the jack-o-lantern, and these scary pumpkins will be seen all over around this time of year. Halloween is probably the spookiest time of the year! Around this holiday, scary decorations go up and costumes are prepared for trick or treating. And finally, a rotary grinder with a metal cut off wheel is nice to have to cut metal with.
Officials hope to eradicate the non-native fish, which was illegally released, from the pond. pond after DNR officials poisoned the pond with rotenone. Department of Natural Resources (DNR) fisheries biologist Kinte Thompson holds an adult northern snakehead fish that was killed Wednesday, Sept.Northern snakehead fish, photo on black (Associated Press).(Photo by William Thomas Cain/Getty Images) Scientists fear the fish, with its voracious appetite, can destroy or severely harm the ecosystem. The northern snakehead can grow to several feet in size, crawl on land for short distances, and is native to Asia and Africa. Richard Horwitz, a senior biologist with the Academy of Natural Sciences and his team caught 15 northern snakehead, whose scientific name is Channa Argus, in FDR Park two days ago. PHILADELPHIA – APRIL 28: A northern snakehead fish swims in a tank at the Academy of Natural Sciences Apin Philadelphia, Pennsylvania.The snakehead has been found in parts of Maryland as well as in Lake Michigan. The fish is highly predatory and some species have the ability to breathe air while crossing land to new bodies of water. One caveat, however, is that snakeheads are arguably slimier than most other fish you. In fact, due to the heartiness and firmness of snakehead meat, they are actually very easy to fillet. The northern snakehead, dubbed “Frankenfish”, is an invasive species from Asia that threatens North American ecosystems. No live snakehead fish, progeny thereof, or viable eggs imported or transported under a permit may be sold, donated, traded, loaned, or transferred to any. Trout, pike, and pickerelall of which are popular on the tablehave many more small bones that need to be dealt with than snakeheads. Department of Agriculture, a northern snakehead fish is held. UNDATED: In this undated handout photo from the U.S. The trackpad is disappointing and the battery life poor, but if you want a home gaming laptop with which you’ ll use a mouse, the Helios 300 is a great choice. This allows GIMPS to double-check a PRP test at less than 1 of the cost of a full PRP test PRP proofs require lots of temporary disk space. This new Helios 300 model tones everything down a bit, mainly for those who don’ t have a couple of thousand to spend on a new laptop. Align and install the hard drive module into its slot on the lower case. We recommend routing the HDD cable underneath the newly installed hard drive. So youre saying I can put a 2 terabyte HDD. Your existing SSD should be taking up the m.2 slot. Connect the hard drive cable to the new hard drive. The Helios 300 series has one thin 2.5' bay that can fit either a standard sata SSD of just about any capacity or a 2.5' HDD up to 2 terabytes (larger than that are thicker drives for server or compact desktop usage). Install the new hard drive in the hard drive module using the four screws included in the packaging. This series used to be filled with laptops designed to show off the latest hardware, complete with trackpads and keyboards designed for the hardcore crowd. Secure the 15 screws you removed in step 1. The Acer Predator Helios 300 is the first mid-range laptop in the Predator range. Poor battery life and an uncomfortable trackpad mean it’s not as appealing away from the charger, without a mouse plugged-in, though. Games look good on the Acer Predator Helios 300. The screen is what secures it a fairly good score, though, with solid colour and decent contrast a close enough match for just about any non-wide-gamut display. It gets you good performance per pound with elements of gamer flashiness that appeals to some. The Acer Predator Helios 300 is a good gaming laptop if you’re after a machine that’ll be plugged-in 95 percent of the time. It is shown that occurrence of magnesium hydride electrical conductivity occurs in the field of existence of high-pressure hP 2 phase This work was partially supported by the Presidium of the Russian Academy of Sciences within the Program of Basic Research ``Thermal Physics and Mechanics of Extreme Energy Effects and Physics of Strongly Compressed Matter and Russian Foundation for Basic Research Grant No. Identification of the hydride in experiments was made on the basis of calculations of phase trajectories loading a material in the area of existence of polymorphic phases including high-pressure phases of magnesium hydride (α and γ MgH 2, hP1 and hP 2). High pressures and temperatures were obtained with an explosive device, which accelerates the metallic impactor up to 3 km/s. A study of thermodynamic properties of MgH 2 under multishock compression has been carried out also. Earlier we had been experimentally studied metallization possibility of alane at high pressures in conditions quasiisentropic compression up to 100 GPa. The electrical conductivity of MgH 2 has been studied under multishock compression. Shakhray, Denis Molodets, Alexander Fortov, Vladimir SECURITY CLASSIFICATIONĮlectrical conductivity of MgH 2 at multiple shock compression SUBJECT TERMS magnesium hydride, MgH, thermal energy storage materials, endothermic reaction 16. Wronski: Particle size, grain size and gamma-MgH 2 effects on the desorption properties of nanocrystal- line commercial magnesium hydride processed.Catalytic effects of various forms of nickel on the synthesis rate and hydrogen desorption properties of nanocrystalline magnesium hydride ( MgH 2.dehydrogenation reaction. Catalytic Influence of Ni-based Additives on the Dehydrogentation Properties of Ball Milled MgH 2 (PREPRINT) Further experiments confirm that the low temperature kinetic degradation can be mainly related the extended hydrogenation-dehydrogenation reactions. However, the low temperature (25Â☌ to 150Â☌) hydrogenation kinetics suffer a severe degradation during hydrogen cycling. The hydrogenating and dehydrogenating kinetics at 300Â☌ are stable after 100 cycles. Three systems, including MgH 2-TiH 2, MgH 2-TiMn 2, and MgH 2-VTiCr, are examined. Cyclic stability of catalyzed MgH 2 is characterized and analyzed using a PCT Sievert-type apparatus. Thermodynamic properties of the reactions between the magnesium solid solution alloys and hydrogen are investigated, showing that all the solid solution alloys that are investigated in this work have higher equilibrium hydrogen pressures than that of pure magnesium. Various elements are alloyed with magnesium to form solid solutions, including indium and aluminum. Solid solution alloys of magnesium are exploited as a way to destabilize magnesium hydride thermodynamically. The results show that additives such as Ti and V-based metals, hydride, and certain intermetallic compounds have strong catalytic effects. A systematic experimental survey is carried out in this study to compare a wide range of additives including transitions metals, transition metal oxides, hydrides, intermetallic compounds, and carbon materials, with respect to their effects on dehydrogenation properties of MgH 2. TiV0.62Mn1.5, TiMn 2, and LaNi5 alloys are selected as the matching cold hydride. The hot hydride that is identified and developed is catalyzed MgH 2 due to its high energy density and enhanced kinetics. The system utilizes a pair of thermodynamically matched metal hydrides as energy storage media. A concept of thermal battery based on advanced metal hydrides is studied for heating and cooling of cabins in electric vehicles. Metal hydrides are a group of important materials known as energy carriers for renewable energy and thermal energy storage. A study of advanced magnesium-based hydride and development of a metal hydride thermal battery system |
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