All types of hematopoietic cells, including both myeloid and lymphoid lineages, are created in bone marrow however, lymphoid cells must migrate to other lymphoid organs (e.g. Human marrow produces approximately 500 billion blood cells per day, which join the systemic circulation via permeable vasculature sinusoids within the medullary cavity. Bone marrow comprises approximately 5% of total body mass in healthy adult humans, such that a man weighing 73 kg (161 lbs) will have around 3.7 kg (8 lbs) of bone marrow. In adult humans, bone marrow is primarily located in the ribs, vertebrae, sternum, and bones of the pelvis. It is composed of hematopoietic cells, marrow adipose tissue, and supportive stromal cells. In birds and mammals, bone marrow is the primary site of new blood cell production (or haematopoiesis). Our product offerings include millions of PowerPoint templates, diagrams, animated 3D characters and more.Bone marrow is a semi-solid tissue found within the spongy (also known as cancellous) portions of bones. is brought to you by CrystalGraphics, the award-winning developer and market-leading publisher of rich-media enhancement products for presentations. Then you can share it with your target audience as well as ’s millions of monthly visitors. We’ll convert it to an HTML5 slideshow that includes all the media types you’ve already added: audio, video, music, pictures, animations and transition effects. You might even have a presentation you’d like to share with others. And, best of all, it is completely free and easy to use. Whatever your area of interest, here you’ll be able to find and view presentations you’ll love and possibly download. It has millions of presentations already uploaded and available with 1,000s more being uploaded by its users every day. is a leading presentation sharing website. Introduce a local perturbation which change the Z2 spin liquid on a cylinder 2-fold degenerate.Half-odd integer spins versus integer onesĪ toy model for a topological quantum-bitG.Open question spin-1/2-Heisenberg model on the.A Realistic Spin Liquid MSE on triangular latt.Quantum phases Valence Bond Crystals and Spin.Susceptibility at intermediate temperatures (C. A very tiny spin gap if any (Ramirez et al, Bono,.Low lying local singlet excitations (Ramirez et.Some features are very much alike the spin-1/2.Very large extensive entropy from singlets atĪt low temperature Cv is insensitive to large.A gap lt 10 -3 in the singlet sector (if any)!.The Heisenberg model on the kagomé lattice Quantum ground-state and first excitations of LatticesHalf integer odd spins versus integerĬlassical Heisenberg Hamiltonian on the kagoméĪn infinite number of soft modes, an infinite T0ĭegeneracy Same property on the checkerboard Model on the kagomé checkerboard and pyrochlore Quantum behavior of models with infinite localĭegeneracy in the classical limit Heisenberg Rokhsar Kivelson has no real spin liquid phase On the square lattice the original model due to Quantum numbers 4 unconnected topological Parities of winding numbers (?x, ?y) are good Topological degeneracy in SRRVB Spin Liquids MSE Spin Liquid Spin gap Topological degeneracy
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Rediscovered Papyri Fragments Provide Charming Insight into Everyday Life in Ancient Egypt.Egyptian numerals, like Roman numerals, are closely tied to the Egyptian writing system. Nonetheless, the ancient Egyptians were very adept in using arithmetic to accomplish tasks in accounting and engineering. For the ancient Egyptians, numbers were quantities of physical objects rather than abstractions which existed separate from the objects that they described. For example, if you mentioned the number 7 to an ancient Egyptian, she would probably first think of a grouping of 7 objects rather than the concept of the number 7. Egyptian Mathematics as Revealed in the Rhind PapyrusĪncient Egyptians don’t appear to have thought abstractly about numbers. Most of what is known about how the Egyptians did mathematics is revealed in the Rhind papyrus and similar documents. These scribes, in addition to learning to read and write, also had to learn mathematics. The ancient Egyptian government needed to keep track of taxes and trade and it relied on a class of professional scribes. (Ad Meskens / CC BY-SA 3.0 )Īnother reason that mathematics was important to Egypt, and ancient civilizations in general, was maintaining a complex society. Ī section of the hieroglyphic calendar at the Kom Ombo Temple, displaying the transition from month XII to month I. Egyptian priests eventually used these calculations to create the Egyptian calendar. Because of this, the Egyptians were very careful to observe the motion of Sirius. For this reason, the ancient Egyptians taught themselves astronomy.Įgyptian priests eventually realized that the flooding season was heralded by the heliacal rising of the star Sirius. Because Egyptian farmers relied on the regular flooding of the Nile, it was helpful to know when the floods would come so that farmers could prepare. One was related to agriculture and the seasons. There are many reasons that the ancient Egyptians needed to learn mathematics. The fertile soil is one of the main reasons that Egypt was destined to become a center of civilization with the rise of agriculture. Regular flooding along the Nile makes the land around the river especially fertile for growing crops. It eventually ends in the Nile River delta which fans out into the Mediterranean Sea. The Nile flows through limestone hills into a floodplain. Most of Egypt is a desert, but the Nile provides a long narrow strip of arable land. It has its origins with farming communities that emerged along the Nile river. Historical Background of Egyptian MathematicsĪncient Egypt was one of the first relatively advanced, centralized civilizations to emerge in the ancient Mediterranean region, and probably the world. Because the name of its original author is known, the Rhind papyrus is also occasionally referred to as the Ahmes papyrus. The mathematical problems reveal important information about how ancient Egyptians worked with multiplication, division, and fractions. It was written by a scribe by the name of Ahmes and consists of a series of practice problems for novice scribes. When it was first examined by scholars, it was found to be a mathematical document. The papyrus text is currently in the British Museum. It was found and purchased by Alexander Henry Rhind in 1858 from a Nile town in Egypt. The Rhind papyrus is a document dating to around 1,650 BC. But much of what scholars know of Egyptian mathematics comes from this text. One text that reveals an example of that wisdom is the Rhind papyrus, a document that appears to be an otherwise mundane primer on mathematics. For millennia, ancient Egypt has been considered synonymous with wisdom by the civilizations of the Mediterranean basin, but especially the West. Greek intellectuals, such as Thales, visited Egypt and were enamored by the design and mathematical exactness of the shape of the pyramids. Western civilization has always had a fascination with the civilization which grew up along the Nile River around 3,000 BC. We are sincerely expecting your attention. Original leaf buddi Th-320 Battery Mod E Cigarettes Starter Kits 650mAh Variable Voltage Fit 510 thread Cartridges Mini Kit. It is our great honor to meet your demands. Leaf Buddi Th-720 PRO Preheat 500mAh 510 Thread Votlages Adjustable Vape Pen, Find Details and Price about Leaf Buddi Th720 from Leaf Buddi Th-720 PRO. Persisting in "High quality, Prompt Delivery, Competitive Price", we have established long-term cooperation with clients from both overseas and domestically and get new and old clients' high comments. 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In fact, at an equal print size, a DX camera will show more diffraction than an FX camera. Again, I recommend testing the exact boundaries of your camera yourself. If this is the case for you, diffraction absolutely is a bigger issue than it would have been with a low-resolution sensor! To get the best possible sharpness from a D800/D810, you should pay attention if your aperture is smaller than about f/8. That said, if you buy the Nikon D800/D810, chances are good that you want to print large or pixel-peep. This means that, if you print your photos at the same size, a Nikon D800/D810 photo will always have more detail than a Nikon D700 photo, all else equal. More pixels will never lead to lower detail, even at the tiniest of apertures. In fact, if all your settings are the same, a high-resolution sensor will always capture more detail than a low-resolution sensor of the same size. However, this isn’t a problem with high-resolution sensors. These numbers aren’t set in stone, though I recommend testing your own camera to see when diffraction begins to grow noticeable (and, more importantly, when it begins to grow objectionable). Perhaps I can stop down to f/11 on the 12-megapixel Nikon D700 before noticing any diffraction, while the 36-megapixel D800/D810 would show visible diffraction at any aperture smaller than f/5.6. In fact, that is completely true! Large pixels – those which are bigger than the Airy disk – do not show diffraction at the same apertures that a small-pixel camera would. The comparison above, showing an Airy disk hitting the pixels of your sensor, might prompt a question: if the pixels were larger, wouldn’t the Airy disk be less likely to bleed over? This is the reason that you see diffraction! High- Versus Low-Megapixel Cameras These, as shown above, become blurrier with small aperture values. Every pinpoint of light travels through the aperture of your lens as a result, each part of your photograph projects onto your sensor as an Airy disk. Now, think of a scene as being composed of countless tiny sources of light. (Note that, in reality, the Airy disk grows dimmer as the aperture grows narrower to simplify the diagram, this effect is not shown here.) But how does this impact your everyday photography? In fact, a similar experiment (with two slits rather than one) played a major role in proving that light can behave as a wave – one of the most important discoveries in scientific history. Diffraction in PhotographyĬlearly, diffraction is an important concept in physics. At its most basic, a small opening causes waves to bend and interfere with one another this, in turn, spreads out their signal. This is why light, which has a tiny wavelength, will not diffract significantly if it passes through a ten-foot wide opening – even though the ocean does.Ĭongratulations! You now understand the physics of diffraction. In fact, the opening only causes diffraction when it is similar in size to the wavelength that passes through it. (This is a slight simplification for more technical information, I recommend reading the Wikipedia page on the Huygens principle.)įinally, note that a “small” opening is relative. Smaller openings, though, affect a wave more significantly, causing it to bend at harsher angles. Since the waves are not particularly disturbed, they follow a relatively straight path towards the edge of the pool. Essentially, larger openings allow the waves to pass without much interference. These waves spread out in concentric circles, just like the image below:Īlthough it may initially seem unusual that a small opening leads to a larger spread of waves, the illustrations above should show that it makes logical sense. If you drop a rock into a perfectly still lake, you will cause a ripple of small waves to form. To make this easy to visualize, consider waves of water. In fact, every time that waves pass through a slit, they will interfere. That said, this section is meant to be understandable even if you are not a physicist we recommend reading it, since it will provide a more solid foundation for your understanding of diffraction.Īt its most basic, diffraction is the concept that waves – including light waves – can interfere with one another. Most photographers are interested in day-to-day knowledge rather than comprehensive background information, but it is impossible to talk about diffraction without describing how it works at a fundamental level. In explaining diffraction, it can be difficult to straddle the line between avoiding and embracing references to optical physics. It’s also one of the few providers to offer a Gantt chart for free. TeamGantt takes the top spot because of its beautiful Gantt chart that functions extremely well and offers clear symbols, so you can easily digest the information of your project.
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