|
Glass Knife
A glass knife is a knife with a blade made of glass, with a fracture line forming an extremely sharp cutting edge. Glass knives were used in antiquity due to their natural sharpness and the ease with which they could be manufactured. In modern electron microscopy glass knives are used to make the ultrathin sections needed for imaging. History In the Stone Age, bladed tools were made by chipping suitable stones which broke with a conchoidal fracture, a process known as knapping or lithic reduction. The same technique was used to make tools, including knives, out of obsidian, natural volcanic glass. From the 1920s until the 1940s, Dur-X glass fruit and cake knives were sold for use in kitchens under a 1938 US Patent. Before the wide availability of inexpensive stainless steel cutlery, they were used for cutting citrus fruit, tomatoes and other acidic foods, the flavor of which would be tainted by steel knives and which would stain ordinary steel knives. They were molded in te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultramicrotome (sample Holder And Glass Knife)
A microtome (from the Greek ''mikros'', meaning "small", and ''temnein'', meaning "to cut") is a cutting tool used to produce extremely thin slices of material known as ''sections''. Important in science, microtomes are used in microscopy, allowing for the preparation of samples for observation under transmitted light or electron radiation. Microtomes use steel, glass or diamond blades depending upon the specimen being sliced and the desired thickness of the sections being cut. Steel blades are used to prepare histological sections of animal or plant tissues for light microscopy. Glass knives are used to slice sections for light microscopy and to slice very thin sections for electron microscopy. Industrial grade diamond knives are used to slice hard materials such as bone, teeth and tough plant matter for both light microscopy and for electron microscopy. Gem-quality diamond knives are also used for slicing thin sections for electron microscopy. Microtomy is a method for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamond Knives
A diamond knife is a very sharp knife in which the edge is made from diamond, invented by Humberto Fernández-Morán in 1955. Diamond knives are used for medical and scientific applications where an extremely sharp and long-lasting edge is essential. The knives are very expensive to purchase, depending on the quality and size of the knife; in addition the knives must be professionally sharpened as the edge dulls. Eye surgery Diamond knives are used in eye surgery, specifically in refractive surgery. In particular they are the main tool, together with the microscope, for the radial keratotomy invented by Svyatoslav Fyodorov to correct myopia and for the Mini Asymmetric Radial Keratotomy (M.A.R.K.), invented by Marco Abbondanza to correct astigmatism and cure the first and second stages of keratoconus. Ultramicrotomy Metal microtome knives or razor blades are too soft and dull to cut ultrathin sections. In 1950, Latta and Hartmann discovered that the edge of broken glass could be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microscopy
Microscopy is the technical field of using microscopes to view objects and areas of objects that cannot be seen with the naked eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of microscopy: optical, electron, and scanning probe microscopy, along with the emerging field of X-ray microscopy. Optical microscopy and electron microscopy involve the diffraction, reflection, or refraction of electromagnetic radiation/electron beams interacting with the specimen, and the collection of the scattered radiation or another signal in order to create an image. This process may be carried out by wide-field irradiation of the sample (for example standard light microscopy and transmission electron microscopy) or by scanning a fine beam over the sample (for example confocal laser scanning microscopy and scanning electron microscopy). Scanning probe microscopy involves the interaction of a scanning probe with the surface of the objec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
What Good Is A Glass Dagger?
"What Good Is A Glass Dagger?" is a fantasy short story written by Larry Niven and published for the first time in 1972. It occurs in the same fictional universe as the book ''The Magic Goes Away'', by Niven, being the second story in this universe, the sequel to the short story "Not Long Before the End". Asimov comments that in this story Niven "seeks to provide a scientific explanation for magic". The concept of ''mana'' appears in it, and from it has spread to the RPGs. However, it is not original to the book, as Niven said he learned about it by reading the book '' The Trumpet Shall Sound '' (1968). Niven also invokes the principle of mass conservation In physics and chemistry, the law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass ca ... at some point in the narrative.Charles L. Adler Wizards, Aliens, and Starship ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larry Niven
Laurence van Cott Niven (; born April 30, 1938) is an American science fiction writer. His best-known works are ''Ringworld'' (1970), which received Hugo, Locus, Ditmar, and Nebula awards, and, with Jerry Pournelle, ''The Mote in God's Eye'' (1974) and ''Lucifer's Hammer'' (1977). The Science Fiction and Fantasy Writers of America named him the 2015 recipient of the Damon Knight Memorial Grand Master Award. His work is primarily hard science fiction, using big science concepts and theoretical physics. It also often includes elements of detective fiction and adventure stories. His fantasy includes the series ''The Magic Goes Away'', rational fantasy dealing with magic as a non-renewable resource. Biography Niven was born in Los Angeles. He is a great-grandson of Edward L. Doheny, an oil tycoon who drilled the first successful well in the Los Angeles City Oil Field in 1892, and also was subsequently implicated in the Teapot Dome scandal. Niven briefly attended the Califor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Game Of Thrones
''Game of Thrones'' is an American fantasy drama television series created by David Benioff and D. B. Weiss for HBO. It is an adaptation of ''A Song of Ice and Fire'', a series of fantasy novels by George R. R. Martin, the first of which is ''A Game of Thrones''. The show was shot in the United Kingdom, Canada, Croatia, Iceland, Malta, Morocco, and Spain. It premiered on HBO in the United States on April 17, 2011, and concluded on May 19, 2019, with 73 episodes broadcast over eight seasons. Set on the fictional continents of Westeros and Essos, ''Game of Thrones'' has a large ensemble cast and follows several story arcs throughout the course of the show. The first major arc concerns the Iron Throne of the Seven Kingdoms of Westeros through a web of political conflicts among the noble families either vying to claim the throne or fighting for independence from whoever sits on it. A second focuses on the last descendant of the realm's deposed ruling dynasty, who ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Elder Scrolls
''The Elder Scrolls'' is a series of Action role-playing game, action role-playing video games primarily developed by Bethesda Game Studios and published by Bethesda Softworks. The series focuses on Nonlinear gameplay, free-form gameplay in an open world. ''The Elder Scrolls III: Morrowind, Morrowind'', ''The Elder Scrolls IV: Oblivion, Oblivion'' and ''The Elder Scrolls V: Skyrim, Skyrim'' all won List of Game of the Year awards, Game of the Year awards from multiple outlets. The series has sold more than 58 million copies worldwide. * ''The Elder Scrolls III: Morrowind'' - 4 million sold () * ''The Elder Scrolls IV: Oblivion'' - 9.5 million sold * ''The Elder Scrolls V: Skyrim'' - 30 million sold * ''The Elder Scrolls Online'' - 15 million sold Within the series' fictional universe, each game takes place on the continent of Tamriel. The setting combines pre-medieval real-world elements, such as a powerful Roman Empire, Roman-like Empire, with high fantasy medieva ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brandon Sanderson
Brandon Winn Sanderson (born December 19, 1975) is an American author of high fantasy and science fiction. He is best known for the Cosmere fictional universe, in which most of his fantasy novels, most notably the ''Mistborn'' series and ''The Stormlight Archive'', are set. Outside of the Cosmere, he has written several young adult and juvenile series including ''The Reckoners'', the '' Skyward'' series, and the ''Alcatraz'' series. He is also known for finishing Robert Jordan's high fantasy series ''The Wheel of Time'' and has created several graphic novel fantasy series including ''White Sand'' and ''Dark One''. He created Sanderson's Laws of Magic and popularized the idea of "hard magic" and "soft magic" systems. In 2008, Sanderson started a podcast with author Dan Wells and cartoonist Howard Tayler called ''Writing Excuses'', involving topics about creating genre writing and webcomics. In 2016, the American media company DMG Entertainment licensed the movie rights to Sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mistborn
''Mistborn'' is a series of epic fantasy novels written by American author Brandon Sanderson and published by Tor Books. The first trilogy, published between 2006 and 2008, consists of ''The Final Empire'', ''The Well of Ascension'', and ''The Hero of Ages''. A second series was released between 2011 and 2022, and consists of ''The Alloy of Law'', ''Shadows of Self'', ''The Bands of Mourning'' and ''The Lost Metal''. A third series will follow them, which is likely to be released yearly from 2025 to 2027. A fourth trilogy is also planned. Sanderson also released a novella in 2016, '' Mistborn: Secret History''. The first Mistborn trilogy chronicles the efforts of a secret group of Allomancers who attempt to overthrow a dystopian empire and establish themselves in a world covered by ash. The first trilogy was a huge success and it pushed Sanderson to further develop his fictional universe, the Cosmere, which also includes ''The Stormlight Archive''. Set about 300 years after the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snow Crash
''Snow Crash'' is a science fiction novel by the American writer Neal Stephenson, published in 1992. Like many of Stephenson's novels, it covers history, linguistics, anthropology, archaeology, religion, computer science, politics, cryptography, memetics, and philosophy. In his 1999 essay " In the Beginning... Was the Command Line", Stephenson explained the title of the novel as his term for a particular software failure mode on the early Macintosh computer. Stephenson wrote about the Macintosh that "When the computer crashed and wrote gibberish into the bitmap, the result was something that looked vaguely like static on a broken television set—a 'snow crash. Stephenson has also mentioned that Julian Jaynes' book ''The Origin of Consciousness in the Breakdown of the Bicameral Mind'' was one of the main influences on ''Snow Crash''. Stephenson originally planned ''Snow Crash'' as a computer-generated graphic novel in collaboration with artist Tony Sheeder. In the author's ackn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tungsten Carbide
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes through sintering for use in industrial machinery, cutting tools, chisels, abrasives, armor-piercing shells and jewelry. Tungsten carbide is approximately twice as stiff as steel, with a Young's modulus of approximately 530–700 GPa, and is double the density of steel—nearly midway between that of lead and gold. It is comparable with corundum (α-) in hardness and can be polished and finished only with abrasives of superior hardness such as cubic boron nitride and diamond powder, wheels and compounds. Naming Historically referred to as Wolfram, ''Wolf Rahm'', wolframite ore was then later carburized and cemented with a binder creating a composite now called "tungsten carbide". Tungsten is Swedish for "heavy stone". Col ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliers
Pliers are a hand tool used to hold objects firmly, possibly developed from tongs used to handle hot metal in Bronze Age Europe. They are also useful for bending and physically compressing a wide range of materials. Generally, pliers consist of a pair of metal first-class levers joined at a fulcrum positioned closer to one end of the levers, creating short ''jaws'' on one side of the fulcrum, and longer handles on the other side. This arrangement creates a mechanical advantage, allowing the force of the grip strength to be amplified and focused on an object with precision. The jaws can also be used to manipulate objects too small or unwieldy to be manipulated with the fingers. Diagonal pliers, also called side cutters, are a similarly-shaped tool used for cutting rather than holding, having a pair of stout blades, similar to scissors except that the cutting surfaces meet parallel to each other rather than overlapping. Ordinary (holding/squeezing) pliers may incorporate a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Glass Knife")
