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Topic: Polycrystal

	Polycrystal diamond fluted tool and a process for the production of the same - Patent 5020394
		A polycrystal diamond fluted tool is provided which is capable of effecting working with much higher accuracy and longer life as compared with the sintered diamond straight fluted tool of the prior art, and is particularly suitable for finishing working with high accuracy.
		A polycrystal diamond fluted tool, in which at least a part of the rake face of a fluted tool base metal of a cemented carbide alloy is brazed with a polycrystal diamond film synthesized by a vapor phase method to form a cutting edge.
		In the present invention, a polycrystal diamond film in the form of a flute to be a tool material is firstly formed by a vapor phase synthesis method, on the surface of a substrate having been subjected to helical grinding to give the same a flute shape as that of a tool base metal.
	www.freepatentsonline.com /5020394.html (2823 words)

	AGU Mantle Video
		It is an excellent example to illustrate the relationship between microscopic processes at the atomic scale and macroscopic properties, relying on polycrystal plasticity theory developed by materials scientists.
		We apply two-dimensional finite element methods and polycrystal plasticity theory to model deformation in the solid upper mantle of the Earth.
		By including polycrystal plasticity, geophysical deformation modeling is entering a new state of refinement and is an excellent example for quantitative texture analysis.
	eps.berkeley.edu /~wenk/TexturePage/AGU-Mantle-Video.htm (1491 words)

	U.S. Patent: 5259923 - Dry etching method - November 9, 1993
		Accordingly, if the etching selection ratio between polycrystal silicon and the silicon oxide film is small, and the etching speed within the wafer surface cannot be sufficiently uniformed, the oxide silicon film is completely etched at a section of the wafer surface.
		Next, to examine the etching characteristic of the polycrystal silicon film 42, the etching speed for phosphor-added polycrystal Si, and the uniformity thereof along with a variable high frequency power, were measured.
		Then, etching of the underlaying polycrystal silicon was conducted by use of Cl.sub.2 as the etching gas under the conditions that: the high frequency power of 100W, the pressure of 75 m Torr, and the lower electrode temperature of -60.degree.
	www.everypatent.com /comp/pat5259923.html (7273 words)

	Integrated semiconductor device having insulated gate field effect transistors with a buried insulating film - United ...
		The polycrystal silicon layer 114 on the buried insulating film 102 adjacent to the p.sup.+ region 118 shows the p.sup.+ conductivity type and the insulating film 116 provided at the surface is used as the mask for masking the n type impurity for forming the source and drain regions 108, 108' in the manufacturing process.
		Then, after removing the implantation masking layer, the polycrystal silicon layer in the thickness of about 5000 A is deposited on the thin silicon dioxide film, and patterning of the polycrystal silicon layer and thin silicon dioxide film is performed by photo-lithography.
		On the other hand, the thin silicon dioxide film 116 remains on the surface of the p.sup.+ type region and this is used as the mask for masking the n type impurity in the process wherein the n type impurity is introduced into the region where the source and drain regions are to be formed.
	xrint.com /patents/us/4353085 (5888 words)

	Characterisation of polycrystal deformation by numerical modelling and neutron diffraction measurements (Site not responding. Last check: 2007-09-09)
		The deformation of polycrystals are modelled using three micron mechanic models; the Taylor model, the Sachs model and Hutchinson's self-consistent (SC) model.
		It is concluded that the effect of the elastic anisotropy is limited to the very early stages of plasticity, as the deformation pattern is almost identical for the three materials at higher strains.
		The predictions of the three models are evaluated by neutron diffraction measurements of elastic lattice strains in grain sub-sets within the polycrystal.
	www.risoe.dk /rispubl/AFM/ris-r-985.htm (321 words)

	THESES (Site not responding. Last check: 2007-09-09)
		Unlike a free single crystal, a single crystal in a polycrystal could not deform like a free single crystal, otherwise the strain must be discontinuous across the grain boundaries and voids must be formed between the neighboring grains.
		It is experimentally observed that in each grain (crystal) in a polycrystal the regions near the boundaries deforms differently from the interior.
		Reorientation of crystallographic orientation of individual grain in polycrystal is associated with constrained plastic deformation (by shear on a single or several slip systems).
	www.gyte.edu.tr /malzeme/materials/theses/korkmaz.htm (266 words)

	DoITPoMS TLP - Atomic Scale Structure of Materials - Polycrystals
		The properties of a polycrystal are notably different from those of a single crystal.
		The individual component crystallites are often referred to as grains and the junctions between these grains are known as grain boundaries.
		The three-dimensional shape of grains in a polycrystal is similar to the shape of individual soap bubbles made by blowing air into a soap solution contained in a transparent box.
	www.doitpoms.ac.uk /tlplib/AD3/poly.php (636 words)

	Communique Winter '98 page 1 (Site not responding. Last check: 2007-09-09)
		PolyCrystal is a new material which takes the opposite approach of combining different materials crushed to the sizes of their crystalline structures.
		PolyCrystal's speaker spike has a brass core, encased in a PolyCrystal shell.
		The PolyCrystal racks and speaker stands are as pretty as they come, and define the current state-of-the-art in system resolution.
	www.fatwyre.com /comw98_1.html (441 words)

	Method of manufacturing ferrite crystals - Patent 5256242
		A method of manufacturing ferrite crystals such as single crystal bodies and polycrystal bodies with garnet structure is disclosed, which includes the steps of effecting a composition controlling for raw powders, forming raw powders, sintering formed bodies and effecting hot isostatic press treatment for sintered bodies.
		In the construction mentioned above, ferrite polycrystal bodies having good properties such as porosity of less than 0.01% and light absorption coefficients of less than 50 cm.sup.-1 at a wavelength of 1.3 micro meter can be obtained by effecting HIP treatment with respect to the sintered polycrystal bodies.
		Moreover, since the thus obtained ferrite polycrystal bodies do not substantially contain any Ca component, the single crystallization by heating the connection body between the mother single crystal and the polycrystal is not affected.
	www.freepatentsonline.com /5256242.html (7203 words)

	CMSN: Microstructural Effects on the Mechanics of Materials
		In polycrystals, plastic response is complicated by the co-evolution of dislocation sub-structures within each individual grain and their interactions mediated by the grain boundaries.
		One revealing FEM simulation of polycrystal plasticity was reported by Anand and Kalidindi, based on the constitutive equations fitted to experimental data on single crystals.
		Since a common observation in coarse-grained polycrystals is that GB sources are the first to operate (likely due to elastic compatibility stresses), it seems reasonable to assume that they would also be the easiest to operate and the last to cease operation as the grain size decreases.
	www.msd.anl.gov /groups/im/research/cmsn/FY2000report.html (9496 words)

	More Vibration Isolation, part 6 [English]
		PolyCrystal note their products were used at CES by Conrad-Johnson, Jadis, Krell, Pass Labs, Sonic Frontiers and VTL, which is heavy-money endorsement for inexpensive product.
		The $150 sets of Polycrystal Reference Isolators look like they're just bigger chunks of their clever-composite material than their Iso-3 model at $65 a set, "a composite made up of multiple inert materials, crushed to the sizes of their crystalline structures and embedded in a matrix" as they say.
		There is little to choose between the basic Polycrystal Isolator and the Basis 15 on price, performance, or character despite their very different construction.
	www.tnt-audio.com /accessories/vibra_iso_pt6_e.html (3196 words)

	Micromechanics Challenges for Modeling Polycrystalline Materials Research Brief
		The simulated deformation response of grains in the polycrystal depends on their crystallographic orientation, which is tracked within each finite element of every grain.
		Consequently, the microstructure can evolve at a subgrain scale within the polycrystal and a large amount of information about the deformation of a polycrystalline material may be divulged at a micro- (and in some cases nano-) size scale.
		At a microscopic scale, the model predicts large variations in stress within the simulated polycrystal due to varying constraints imposed by neighboring grains with different crystallographic orientations.
	www.sandia.gov /materials/sciences/factsheets/MicroChal.html (503 words)

	REVIEWS
		PolyCrystal products have achieved wide acclaim for the improvements they make in the quality of reproduced sound.
		All in all, dynamics improved to a level I would have associated with the purchase of a super amplifier.
		The PolyCrystals also raised the already wonderful imaging a notch further toward ultimate palpability, all the while enhancing air, transparency, and focus.
	www.polycrystal.com /Z-REVIEWS.htm (538 words)

	StereoTimes -- Innovative Audio’s PolyCrystal Systems
		When I first contacted him after getting the 3-shelf PolyCrystal rack from Ultra Systems and told him how impressed I was, he promised to send samples of his other products, but one at a time so that I fully appreciate each piece’s impact.
		All shelves are made of the PolyCrystal stuff, a proprietary composite of resin and inert materials.
		PolyCrystal acts like a detergent in the sense that it will scrub your sound clean.
	www.stereotimes.com /acc040901.shtml (2380 words)

	Some Three-Dimensional Problems Related to Dielectric Breakdown and Polycrystal Plasticity (ResearchIndex)
		2 ective conductivity of polycrystals and a three-dimensional..
		1 Two--dimensional rigid polycrystals whose grains have one du..
		1 The electrodynamics of polycrystals (context) - Dykhne, Kaganova - 1997
	citeseer.ist.psu.edu /609330.html (420 words)

	Characterisation of polycrystal deformation by numerical modelling and neutron diffraction measurements
		The deformation of polycrystals are modelled using three micron mechanic models; the Taylor model, the Sachs model and Hutchinson's self-consistent (SC) model.
		It is concluded that the effect of the elastic anisotropy is limited to the very early stages of plasticity, as the deformation pattern is almost identical for the three materials at higher strains.
		The predictions of the three models are evaluated by neutron diffraction measurements of elastic lattice strains in grain sub-sets within the polycrystal.
	risoe-staged.risoe.dk /Risoe_dk/Home/Knowledge_base/publications/Reports/ris-r-985.aspx (386 words)

	Publications
		Polycrystal plasticity modeling using the Cornell Theory Center's IBM SP supercomputer.
		Effects of interactions among crystals on the inhomogeneous deformations of polycrystals.
		Polycrystal plasticity modeling of bulk forming with finite elements over orientation space.
	anisotropy.mae.cornell.edu /dplab/publications/Publications.html (946 words)

	[No title]
		Next, statistically generated polycrystal samples were created and loaded, resulting in crack initiation along the grain boundaries.
		The work presented here is a preliminary investigation of statistical modeling of polycrystal geometry and properties and the use of cohesive zone models [2] to describe the response of grain boundaries in order to develop a tool to study influences on the initiation of fatigue cracks in aluminum alloys.
		Illustration of Decohesion in Regular Polycrystal Samples After determining that individual grain boundaries would respond according to the CCZM model under load, small regular polycrystal models were tested to observe the effects of neighboring grains on crack propagation.
	www.cfg.cornell.edu /~erin/erin/astm_color.doc (3043 words)

	Galen Carol Audio: Isolation & Resonance Control
		The higher mass of the Polycrystal Spikes increases stability and speaker to floor coupling.
		In his 1998 review of Polycrystal Spikes for Stereophile Magazine, Jonathan Scull writes: “The effect was hardly subtleI noticed highs that were beautifully open, clear and lovely.
		In the top of each Polycrystal spike is a hole threaded to ¼” x 20.
	www.gcaudio.com /cgi-bin/store/showProduct.cgi?id=143 (264 words)

	WELCOME!
		Our products feature the unique and very effective PolyCrystal, a material that is unparalleled in its ability to dampen resonance by dissipating resonant energy (vibration).
		PolyCrystal is no fluke; other high-end manufacturers use PolyCrystal resin to make their products sound better, too.
		If you're not sure who your nearest PolyCrystal dealer is, we'll locate him or her for you.
	www.polycrystal.com /Z-WELCOME.htm (534 words)

	More Vibration Isolation, part 7 [English]
		The Polycrystal point discs are supplied in sets of 4 but will remove the possibility of 4 spikes levelling themselves into the shelf by deformation.
		With the Polycrystal point discs in place the belt needed to be in the bottom platter groove to align with the 33rpm pulley (45rpm pulley being misaligned).
		The results with the Polycrystal point discs on both sides of the glass shelf is a further gain in the areas already described.
	www.tnt-audio.com /accessories/vibra_iso_pt7_e.html (2535 words)

	Self-repeating structures
		Here we describe an elegant yet unexpected approach to the calculation of polycrystal structures suggested in [#!Nesi:1991:PCM!#].
		is a polycrystal assembled of variously oriented fragments of
		To find this polycrystal, we solve equation 23 for the unknown tensor
	www.math.utah.edu /~cherk/mathmat/workshop/theory/exact/node13.html (238 words)

	Zirconia and Partially Stabilised Zirconia as an Orthopaedic Biomaterial - Characteristics, Properti
		Compared to alumina, partially stabilised zirconia (PSZ) has higher flexural strength, fracture toughness and high Weibull modulus (which equates to better reliability), as well as lower Young's modulus and the ability to be polished to a superior surface finish.
		Low temperature degradation of tetragonal zirconia polycrystal is known to occur as a result of the spontaneous phase transformation of the tetragonal zirconia to monoclinic phase during ageing at 130-300°C possibly within water environment.
		It has been reported that this degradation leads to a decrease in strength due to the formation of microcracks and accompanying phase transformation.
	www.azom.com /details.asp?ArticleID=2161 (1882 words)

	OEM SHOP
		PolyCrystal Coated Aluminum Cones - Offering the clarity and low distortion of aluminum with the smoothness of paper or poly cones (the best of both worlds!); a typical 10" paper cone weighs about 40 grams—our cone weighs 22 grams with greater rigidity!
		Speaker Driver Modification - Using PolyCrystal to reduce the resonance artifacts, resulting in superior driver performance and increased musicality.
		To learn more about PolyCrystal and how it controls resonance-induced coloration, go to the PolyCrystal site.
	www.polycrystal.com /Z-OEM_Shop1.htm (250 words)

	josephRM25si
		Further down, in the middle of the west wall, I have two five-tier PolyCrystal equipment racks at right angles to each other containing all of my source and front-end gear, with a little bit of room in the rear to play around with cables and AC cords.
		To the immediate left of the area behind the loudspeakers, an old doorway to the kitchen and most of the east wall is covered by a set of six CD cases that form a right angle and extend all the way up to the ceiling.
		However, because I have two sets of 20-amp dedicated lines in the northwest corner of the adjacent room on the archway/east wall separating the two rooms, a 25-foot, three-outlet-equipped JPS Labs Kaptovator Outlet Center functions as a custom high-rez Extension Cord of the Gods.
	www.positive-feedback.com /Issue13/josephRM25si.htm (5287 words)

	Groupe Arnaud Electronics: News - Furukawa to increase production of high purity arsenic and GaP polycrystal in fiscal ... (Site not responding. Last check: 2007-09-09)
		Furukawa announced in March that it will increase production of high purity arsenic and GaP polycrystal in fiscal 1999.
		The company plans to expand monthly production of the materials at its Iwaki plant form 5.0 to 5.6 tons and from 500 to 600 kg, respectively.
		The company says it has a 70% share of the global high purity arsenic market, and it is also the leader in the GaP polycrystal market with a 25% share.
	www.arnaudelectronics.com /news/furukawa_0599.html (119 words)

	EXPERIMENT IN GEOSCIENCES, volume 6, number 1: Methods and techniques of experiment
		The MINCRYST is the original self-consistent combination of the database on crystal structures of minerals, the subordinate database on calculated polycrystal standards, and applied software package.
		These data characterize a mineral both as a single crystal (basic parameters are the coordinates of atomic sites) and a polycrystal (basic parameters are interplanar spaces).
		EIVS-96 allows the combined data storage and operation of the Database on Crystal Structures and the Subordinate Database on Polycrystal Standards and provides all the necessary functions (import, export, edition of records, data retrieval based on sign combinations, etc.).
	library.iem.ac.ru /exper/v6_1/np9.html (1715 words)

	Polycrystal Simulation Software
		It handles plotting of the ODF using Rodrigues parameters, plotting of pole figures and inverse pole figures, evaluation of pole figures inverse pole figures from ODF's, and it provides many tools for computing ODF's from pole figures.
		The material point simulator is a FORTRAN program which models viscoplastic polycrystal deformation for a discrete aggregate of orientations.
		The core of the material point simulator is computation of the stress/strain rate relationship for single crystals and for upper-bound and lower-bound polycrystal models.
	anisotropy.mae.cornell.edu /onr/welcome.html (501 words)

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