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Diffractive Optically Variable Image Device
A diffractive optically variable image device (DOVID) is a type of optical variable device; a security feature based on visual effects created by diffraction. DOVIDs are incorporated in government-issued documents of value (banknotes, passports, visas, identification credentials and driver licenses) to increase their counterfeit resistance. Brand protection is another application of DOVIDs. DOVIDs contain micro- or nanostructures in the form of diffractive gratings. Due to these structures, they exhibit optically variable effects such as dynamic chromatic, holographic, and kinematic effects, two- or three-dimensional images or color-changing effects, which ideally are easily recognized, but are difficult to reproduce. Well known examples of DOVIDs are holograms such as 2D or 3D or 2D/3D holograms based on mask illumination, dot matrix or e-beam origination technology and Kinegrams. A DOVID can also contain elements which are invisible to the unaided human eye such as microprint ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Variable Device
An optical variable device or optically variable device (OVD) is an iridescent or non-iridescent security feature that exhibits different information, such as movement or colour changes, depending on the viewing and/or lighting conditions. The particular changes of appearance when rotating and tilting are reversible, predictable and reproducible. OVDs cannot be photocopied or scanned, nor can they be accurately replicated or reproduced. OVDs are often used as security devices and anti-counterfeiting measures on banknotes, government-issued identification documents, or credit cards. OVDs can be created through a combination of printing Printing is a process for mass reproducing text and images using a master form or template. The earliest non-paper products involving printing include cylinder seals and objects such as the Cyrus Cylinder and the Cylinders of Nabonidus. The ea ... and embossing. OVDs are based on diffractive optical structures. This gives cards the appearance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heat Sealer
A heat sealer is a machine used to seal products, packaging, and other thermoplastic materials using heat. This can be with uniform thermoplastic monolayers or with materials having several layers, at least one being thermoplastic. Heat sealing can join two similar materials together or can join dissimilar materials, one of which has a thermoplastic layer. Heat sealing process Heat sealing is the process of sealing one thermoplastic to another similar thermoplastic using heat and pressure. The direct contact method of heat sealing utilizes a constantly heated die or sealing bar to apply heat to a specific contact area or path to seal or weld the thermoplastics together. Heat sealing is used for many applications, including heat seal connectors, thermally activated adhesives, film media, plastic ports or foil sealing. Applications for the heat sealing process Heat seal connectors are used to join LCD A liquid-crystal display (LCD) is a flat-panel display or other ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Land Titles
Land registration is any of various systems by which matters concerning ownership, possession, or other rights in land are formally recorded (usually with a government agency or department) to provide evidence of title, facilitate transactions, and prevent unlawful disposal. The information recorded and the protection provided by land registration varies widely by jurisdiction. In common law countries, particularly in jurisdictions in the Commonwealth of Nations, when replacing the deeds registration system, title registrations are broadly classified into two basic types: the Torrens title system and the English system, a modified version of the Torrens system.Lyall, Andrew. ''Land Law in Ireland''. ; Ch. 24 Cadastral systems and land registration are both types of land recording and complement each other.Jo Henssen, BASIC PRINCIPLES OF THE MAIN CADASTRAL SYSTEMS IN THE WORLD, Implementations Americas Canada Falkland Islands The Falkland Islands registry holds copies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birth Certificate
A birth certificate is a vital record that documents the birth of a person. The term "birth certificate" can refer to either the original document certifying the circumstances of the birth or to a certified copy of or representation of the ensuing registration of that birth. Depending on the jurisdiction, a record of birth might or might not contain verification of the event by such as a midwife or doctor. The United Nations Sustainable Development Goal 17, an integral part of the 2030 Agenda, has a target to increase the timely availability of data regarding age, gender, race, ethnicity, and other relevant characteristics which documents like a birth certificate has the capacity to provide. History and contemporary times The documentation of births is a practice widely held throughout human civilization. The original purpose of vital statistics was for tax purposes and for the determination of available military manpower. In England, births were initially registered with c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-refractive-index Polymer
A high-refractive-index polymer (HRIP) is a polymer that has a refractive index greater than 1.50. Such materials are required for anti-reflective coating and photonic devices such as light emitting diodes (LEDs) and image sensors. The refractive index of a polymer is based on several factors which include polarizability, chain flexibility, molecular geometry and the polymer backbone orientation. As of 2004, the highest refractive index for a polymer was 1.76. Substituents with high molar fractions or high-n nanoparticles in a polymer matrix have been introduced to increase the refractive index in polymers. Properties Refractive index A typical polymer has a refractive index of 1.30–1.70, but a higher refractive index is often required for specific applications. The refractive index is related to the molar refractivity, structure and weight of the monomer. In general, high molar refractivity and low molar volumes increase the refractive index of the polymer. Optical propertie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dielectric Material
In electromagnetism, a dielectric (or dielectric medium) is an electrical insulator that can be polarised by an applied electric field. When a dielectric material is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor, because they have no loosely bound, or free, electrons that may drift through the material, but instead they shift, only slightly, from their average equilibrium positions, causing dielectric polarisation. Because of dielectric polarisation, positive charges are displaced in the direction of the field and negative charges shift in the direction opposite to the field (for example, if the field is moving parallel to the positive ''x'' axis, the negative charges will shift in the negative ''x'' direction). This creates an internal electric field that reduces the overall field within the dielectric itself. If a dielectric is composed of weakly bonded molecules, those molecules not only become polar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zinc Sulfide
Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite. Although this mineral is usually black because of various impurities, the pure material is white, and it is widely used as a pigment. In its dense synthetic form, zinc sulfide can be transparent, and it is used as a window for visible optics and infrared optics. Structure ZnS exists in two main crystalline forms. This dualism is an example of polymorphism. In each form, the coordination geometry at Zn and S is tetrahedral. The more stable cubic form is known also as zinc blende or sphalerite. The hexagonal form is known as the mineral wurtzite, although it also can be produced synthetically.. The transition from the sphalerite form to the wurtzite form occurs at around 1020 °C. A tetragonal form is also known as the very rare mineral called polhemusite, with the formula . Applicatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titanium Dioxide
Titanium dioxide, also known as titanium(IV) oxide or titania , is the inorganic compound with the chemical formula . When used as a pigment, it is called titanium white, Pigment White 6 (PW6), or CI 77891. It is a white solid that is insoluble to water, although mineral forms can appear black. As a pigment, it has a wide range of applications, including paint, sunscreen, and food coloring. When used as a food coloring, it has E number E171. World production in 2014 exceeded 9 million tonnes. It has been estimated that titanium dioxide is used in two-thirds of all pigments, and pigments based on the oxide have been valued at a price of $13.2 billion. Structure In all three of its main dioxides, titanium exhibits octahedral geometry, being bonded to six oxide anions. The oxides in turn are bonded to three Ti centers. The overall crystal structure of rutile is tetragonal in symmetry whereas anatase and brookite are orthorhombic. The oxygen substructures are all slight dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyester
Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in plants and insects, as well as synthetics such as polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not. Synthetic polyesters are used extensively in clothing. Polyester fibers are sometimes spun together with natural fibers to produce a cloth with blended properties. Cotton-polyester blends can be strong, wrinkle- and tear-resistant, and reduce shrinking. Synthetic fibers using polyester have high water, wind and environmental resistance compared to plant-derived fibers. They are less fire-resistant and can melt when ignited. Liquid crystalline polyesters are among the first industrially used liquid crystal polymers. They are used f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Bar
A gold bar, also called gold bullion or gold ingot, is a quantity of refined metallic gold of any shape that is made by a bar producer meeting standard conditions of manufacture, labeling, and record keeping. Larger gold bars that are produced by pouring the molten metal into molds are called ingots. Smaller bars may be manufactured by minting or stamping from appropriately rolled gold sheets. The standard gold bar held as gold reserves by central banks and traded among bullion dealers is the Good Delivery gold bar. The kilobar, which is in mass, and a 100 troy ounce gold bar are the bars that are more manageable and are used extensively for trading and investment. The premium on these bars when traded is very low over the spot value of the gold, making it ideal for small transfers between banks and traders. Most kilobars are flat, although some investors, particularly in Europe, prefer the brick shape. Types Based upon how they are manufactured, gold bars are categorized ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kinebar
A kinebar is a gold bar which contains a hologram to protect its authenticity. Kinebars use a hologram called a "Kinegram", a diffractive optically variable image device (DOVID) which is embossed into the gold substrate. "Kinegram" is a trademark of OVD Kinegram AG (Switzerland). The hologram is intended both as a high-security feature and for visual appeal. Union Bank of Switzerland, through Argor- Heraeus SA (subsidiary of Commerzbank), has been applying the kinegram as a security device to the reverse of its minted bars since December 1993. The kinebar, now produced by UBS AG, is a registered trade mark of UBS. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DOVID Foil Layers
David is a common masculine given name. It is of Hebrew origin, and its popularity derives from King David, a figure of central importance in the Hebrew Bible and in the religious traditions of Judaism, Christianity and Islam. Etymology David () means "beloved", derived from the root ''dôwd'' (דּוֹד), which originally meant "to boil", but survives in Biblical Hebrew only in the figurative usage "to love"; specifically, it is a term for an uncle or figuratively, a lover/beloved (it is used in this way in the Song of Songs: אני לדודי ודודי לי, "I am for my beloved and my beloved is for me"). In Christian tradition, the name was adopted as syr, ܕܘܝܕ Dawid, Greek , Latin or . The Quranic spelling is . David was adopted as a Christian name from an early period, e.g. David of Wales (6th century), David Saharuni (7th century), David I of Iberia (9th century). Name days are celebrated on 8 February (for David IV of Georgia), 1 March (for St. David of Wales ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
