|
Pearling Luggers At Thursday Island, 1939 (nacre), the iridescent substance of which pearls and the inner layer of some shells are compo ...
Pearling may refer to: Relating to actual pearls * Pearl farming, which creates cultured pearls * Pearl hunting, the practice of diving for pearls and mother of pearl (nacre) * Pearling in Western Australia, which covers both pearl hunting and pearl farming Other uses * Pearling, a decorative metal surface finishing technique * Pearling (body modification), a form of genital beading * Pearl growing, a search method where the information in one article is used to find further relevant articles on a subject * An alternative spelling for purling, a term in knitting * Debranning, removing the bran of pearl millet See also *Mother of pearl Nacre ( , ), also known as mother of pearl, is an organicinorganic composite material produced by some molluscs as an inner shell layer; it is also the material of which pearls are composed. It is strong, resilient, and iridescent. Nacre is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearl Farming
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, ''pearl'' has become a metaphor for something rare, fine, admirable and valuable. The most valuable pearls occur spontaneously in the wild, but are extremely rare. These wild pearls are referred to as ''natural'' pearls. ''Cultured'' or ''farmed'' pearls from pearl oysters and freshwater mussels make up the majority of those currently sold. Imitation pearls are also widely s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearl Hunting
Pearl hunting, also known as pearling, is the activity of recovering pearls from wild molluscs, usually oysters or mussels, in the sea or freshwater. Pearl hunting was prevalent in the Persian Gulf region and Japan for thousands of years. On the northern and north-western coast of Western Australia pearl diving began in the 1850s, and started in the Torres Strait Islands in the 1860s, where the term also covers diving for nacre or mother of pearl found in what were known as pearl shells. In most cases the pearl-bearing molluscs live at depths where they are not manually accessible from the surface, and diving or the use of some form of tool is needed to reach them. Historically the molluscs were retrieved by freediving, a technique where the diver descends to the bottom, collects what they can, and surfaces on a single breath. The diving mask improved the ability of the diver to see while underwater. When the surface-supplied diving helmet became available for underwater work, it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearling In Western Australia
Pearling in Western Australia includes the harvesting and farming of both pearls and pearl shells (for mother of pearl) along the north-western coast of Western Australia. The practice of collecting pearl shells existed well before European settlement. Coastal dwelling Aboriginal people had collected and traded pearl shell as well as trepang and tortoise with fisherman from Sulawesi for possibly hundreds of years. After settlement, Aboriginal people were used as slave labour in the emerging commercial industry in a practice known as blackbirding. Pearling centred first around Nickol Bay and Exmouth Gulf and then around Broome, to become the largest in the world by 1910. The farming of cultured pearls remains an important part of the Kimberley economy, worth million in 2014 and is the second largest fisheries industry in Western Australia after rock lobster. History The first stage of the European pearling industry: Wading for shell Pearls were first gathered in Wes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Finishing
Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property. Finishing processes may be employed to: improve appearance, adhesion or wettability, solderability, corrosion resistance, tarnish resistance, chemical resistance, wear resistance, hardness, modify electrical conductivity, remove burrs and other surface flaws, and control the surface friction.. In limited cases some of these techniques can be used to restore original dimensions to salvage or repair an item. An unfinished surface is often called '' mill finish''. Surface finishing processes can be categorized by how they affect the workpiece: *Removing or reshaping finishing *Adding or altering finishing Mechanical processes may also be categorized together because of similarities the final surface finish. Adding and altering *Blanching * Burnishing * Calendering *Case hardening *Ceramic glaze *Cladding *Corona treatment *Diffusion processes: **C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearling (body Modification)
Pearling or genital beading is a form of body modification, the practice of permanently inserting small beads made of various materials beneath the skin of the genitals—of the labia, or of the shaft or foreskin of the penis. As well as being an aesthetic practice, this is usually intended to enhance the sexual pleasure of partners during vaginal or anal intercourse. Procedures There are two common procedures, one being very similar to a frenum piercing and the other being similar to inserting a subdermal implant, and requiring more medical knowledge and specialized tools. Either procedure is relatively safe with risks and healing much like a subdermal implant in any other part of the body, although, like many genital piercings, the generous blood flow to the genitals can reduce healing times considerably. Inflammation is very common, during and after healing, although careful healing can minimize this. Rejection is rare, but can occur. Jewellery A wide variety of inert implant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearl Growing
Pearl growing is a metaphor taken from the process of small bits of sand growing to make a beautiful pearl, which is used in information literacy. Pearl Growing is in this context the process of using one information item (like a subject term or citation) to find more information. This search strategy is most successfully employed at the beginning of the research process as the searcher uncovers new pearls about his or her topic. Citation pearl growing Citation pearl growing is the act of using one relevant source, or citation, to find more relevant sources on a topic. The searcher usually has a document that matches a topic or information need. From this document, the searcher is able to find other keywords, descriptors and themes to use in a subsequent search. Citation Pearl Growing is a popular search and retrieval method used by librarians. Subject pearl growing Subject pearl growing is a strategy used in an electronic database that has subject or keyword descriptors. By cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knitting
Knitting is a method by which yarn is manipulated to create a textile, or fabric. It is used to create many types of garments. Knitting may be done by hand or by machine. Knitting creates stitches: loops of yarn in a row, either flat or in ''the round'' (tubular). There are usually many ''active stitches'' on the knitting needle at one time. Knitted fabric consists of a number of consecutive rows of connected loops that intermesh with the next and previous rows. As each row is formed, each newly created loop is pulled through one or more loops from the prior row and placed on the ''gaining needle so'' that the loops from the prior row can be pulled off the other needle without unraveling. Differences in yarn (varying in fibre type, ''weight'', uniformity and ''twist''), needle size, and stitch type allow for a variety of knitted fabrics with different properties, including color, texture, thickness, heat retention, water resistance, and integrity. A small sample of kn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearl Millet
Pearl millet (''Cenchrus americanus'', commonly known as the synonym ''Pennisetum glaucum''; also known as 'Bajra' in Hindi, 'Sajje' in Kannada, 'Kambu' in Tamil, 'Bajeer' in Kumaoni and 'Maiwa' in Hausa, 'Mexoeira' in Mozambique) is the most widely grown type of millet. It has been grown in Africa and the Indian subcontinent since prehistoric times. The center of diversity, and suggested area of domestication, for the crop is in the Sahel zone of West Africa. Recent archaeobotanical research has confirmed the presence of domesticated pearl millet on the Sahel zone of northern Mali between 2500 and 2000 BC. Description Pearl millet has ovoid grains of 3 – 4 mm length, the largest kernels of all varieties of millet (not including sorghum). These can be nearly white, pale yellow, brown, grey, slate blue or purple. The 1000-seed weight can be anything from 2.5 to 14 g with a mean of 8 g. The height of the plant ranges from 0.5 – 4 m. Cultivation Pearl millet is well ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
