Journal articles: 'Diamond Mountain'

1

Immergut, Matthew. "Death at Diamond Mountain." Nova Religio 17, no. 1 (February 2013): 24–37. http://dx.doi.org/10.1525/nr.2013.17.1.24.

Full text

Abstract:

For the past five years, I have engaged in fieldwork and filming a documentary about Diamond Mountain, a community of Western converts to Tibetan Buddhism in southern Arizona under the leadership of Geshe Michael Roach and Lama Christie McNally. The latter was retreat master and, along with her husband Ian Thorson, in the middle of guiding forty students through a three-year, three-month, three-day silent meditation retreat. But when McNally stabbed Thorson, the Diamond Mountain Board asked both to leave. Feigning departure, the couple sneaked into a small cave just outside the Diamond Mountain property, where two months later Thorson died of dehydration. Stories of scandal, cult and death flooded the media. This essay provides an account of these events, the mistrust of my research that emerged because of the media’s stigmatization of the group, and the type of trust-building necessary to continue my research.

APA, Harvard, Vancouver, ISO, and other styles

2

김성림. "Lost and Found:Go Hui-dong and Diamond Mountain." Yeol-sang Journal of Classical Studies ll, no. 52 (August 2016): 37–91. http://dx.doi.org/10.15859/yscs..52.201608.37.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Huang, Hsi Ting, Huai Yi Chen, and Kuan Chih Yeh. "High Sensitive Capacitive Touch Panel with Chain or Mountain-Shaped ITO Electrodes." Advanced Materials Research 813 (September 2013): 351–54. http://dx.doi.org/10.4028/www.scientific.net/amr.813.351.

Full text

Abstract:

This paper used COMSOL Multiphysics software to simulate and design two kinds of new touch panels with chain and mountain-shaped ITO electrodes, respectively. These two touch panel electrodes were both designed using parallel and vertical capacitance configurations. Compared with traditional common rectangular and diamond-shaped electrodes, it was found in simulation results that parallel and vertical capacitive gains for chain and mountain-shaped electrodes were 30% and 6%, respectively, higher than those for traditional rectangular and diamond-shaped ones. In addition, when the ratio of glass thickness (H) to indium tin oxide (ITO) electrode thickness (h) was larger, the corresponding capacitive gain was smaller.

APA, Harvard, Vancouver, ISO, and other styles

4

Zen’kov, I. V., V. N. Vokin, E. V. Kiryushina, A. S. Morin, Zh V. Mironova, P. M. Kondrashov, A. B. Fedorov, and T. A. Veretenova. "A Study of the Formation of a Plant Ecosystem in Areas of Disturbed Lands by the Aikhal Mining and Processing Plant." Ecology and Industry of Russia 24, no. 1 (January 10, 2020): 46–50. http://dx.doi.org/10.18412/1816-0395-2020-1-46-50.

Full text

Abstract:

According to the results of processing satellite images of mining landscapes formed during the extraction and processing of diamond-containing ore, the coefficients of self-restoration of vegetation cover are determined. It has been established that in the mid-mountain and subpolar climate, at intensive rates of open-pit diamond mining, a very slow formation of all types of vegetation cover occurs, which does not meet the requirements of restoring the ecological balance when conducting business operations by diamond mining enterprises.

APA, Harvard, Vancouver, ISO, and other styles

5

Groh, R. M. J., and A. Pirrera. "On the role of localizations in buckling of axially compressed cylinders." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2224 (April 2019): 20190006. http://dx.doi.org/10.1098/rspa.2019.0006.

Full text

Abstract:

The collapse of axially compressed cylinders by buckling instability is a classic problem in engineering mechanics. We revisit the problem by considering fully localized post-buckling states in the form of one or multiple dimples. Using nonlinear finite-element methods and numerical continuation algorithms, we trace the evolution of odd and even dimples into one axially localized ring of circumferentially periodic diamond-shaped waves. The growth of the post-buckling pattern with varying compression is driven by homoclinic snaking with even- and odd-dimple solutions intertwined. When the axially localized ring of diamond-shaped buckles destabilizes, additional circumferential snaking sequences ensue that lead to the Yoshimura buckling pattern. The unstable single-dimple state is a mountain-pass point in the energy landscape and therefore forms the smallest energy barrier between the pre-buckling and post-buckling regimes. The small energy barrier associated with the mountain-pass point means that the compressed, pre-buckled cylinder is exceedingly sensitive to perturbations once the mountain-pass point exists. We parameterize the compressive onset of the single-dimple mountain-pass point with a single non-dimensional parameter, and compare the lower-bound buckling load suggested by this parameter with over 100 experimental data points from the literature. Good correlation suggests that the derived knockdown factor provides a less conservative design load than NASA's SP-8007 guideline.

APA, Harvard, Vancouver, ISO, and other styles

6

Pain, D. D., and B. E. Schieck. "Evolution of Polycrystalline Diamond Compact Bit Designs for Rocky Mountain Drilling." Journal of Petroleum Technology 37, no. 07 (July 1, 1985): 1213–19. http://dx.doi.org/10.2118/12906-pa.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Song, Jeongju. "Extraordinary View of Manmul-Sang, Diamond Mountain of Huijeong-Dang in Changduck Place." Art History Forum 47 (December 31, 2018): 7–28. http://dx.doi.org/10.14380/ahf.2018.47.7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Davudova, E. Z. "SHELL MITES (ACARIFORMES, ORIBATIDA) INTRA-MOUNTAIN DAGESTAN (GUNIB DISTRICT)." Ekosistemy, no. 25 (2021): 105–13. http://dx.doi.org/10.37279/2414-4738-2021-25-105-113.

Full text

Abstract:

Carapace mites are important regulators of the mineralization of organic residues and the immobilization of various biogens in the soil. In the course of the research conducted on the territory of the Gunib district of the Republic of Dagestan, only 89 species of shell mites belonging to 61 genera and 41 families were identified. New data have been obtained that complement the list of species of shell mites in the Caucasus as a whole. Recently described Liacarus (Dorycranosus) musaevi, and two endemics of the Caucasus – Xenillus sculptrus and Suctobelba cornigera – were noted for region. Among other groups of soil microfauna, shell mites occupy a leading position, both in terms of their number and abundance of species. In studies conducted in mountain systems, it was found that the General pattern is a decrease in the number of microarthropods with an increase in absolute height. Very often, the pattern of changes in the taxonomic richness and population density of the microarthropod complex is diamond-shaped, characterized by maxima in the zone with the most favorable microclimate for a large group of species. From top to bottom, the microarthropod population density and taxonomic richness decrease along the mountain profile. As a result of the study, the maximum population density and abundance of oribatid species is observed in the soil of a birch forest and its gradual decrease as it transitions to grasslands, which is explained by changes in the hydrothermal conditions of soil horizons, both due to an increase in height and due to a change in the nature of vegetation to treeless.

APA, Harvard, Vancouver, ISO, and other styles

9

Borofsky, Robert L., Robert Whitmore, and Steven C. Chamberlain. "Scepter Quartz Crystals from the Treasure Mountain Diamond Mine near Little Fails, Herkimer County, New York." Rocks & Minerals 75, no. 4 (July 2000): 231–37. http://dx.doi.org/10.1080/00357520009605649.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Nobrega, Sanna Rocha, Francisco Joaci De Freitas Luz, Jane Maria Franco de Oliveira, Wellington Farias Araújo, and Silvio Garcia Tomé. "Orchid’s diversity at Tepequém’s Tepuy, Roraima, Brazil." Ornamental Horticulture 22, no. 3 (October 29, 2016): 265. http://dx.doi.org/10.14295/oh.v22i3.936.

Full text

Abstract:

The Orchidaceae family is one of the largest among the angiosperm, with more than 27000 species, 2,500 is endemic to Brazil, 871 species are found in the Brazilian Amazon. In the far north of Brazil, in the state of Roraima, is located the Tepequém Mountains, a Tepuy – mountain top with table shape – with relictual vegetation due to prolonged isolation. Historically, Tepequém was a site of diamond exploration, which caused changes in the landscape. However, with mining decay, ecotourism became the main economic activity. About 68% of Roraima’s territory is composed of conservation areas and indigenous lands, and the Tepequém Mountain is the only Tepuy found outside the protected areas. Thus, this study aims to describe the orchid flora found at Tepequém’s Tepuy, an area of ecological and economic importance for Roraima’s ecotourism. The survey was carried out through expeditions between the years of 2013-2015. The species were photographed, harvested and taken to Embrapa Roraima for identification, exsiccate confection and/or cultivation. The exsiccatae were deposited at Roraima’s Integrated Museum (Museu Integrado de Roraima – MIRR) and the Federal University of Roraima (Universidade Federal de Roraima – UFRR). Any orchid species deposited by other collectors was also considered. Thus, 20 genera and 34 species were registered at Tepequém. The genera with largest representation were the Epidendrum (7 spp.), Scaphyglottis (4 spp.) and Habenaria (3 spp.), with 70% of the other genera presenting one species only. 10% of Roraima’s orchid’s diversity is found at Tepequém. The diversity of habitats – forest, campina and savannah – found at Tepequém’s Tepuy allows the Orchidaceae species diversity and the unique flora with low similarities to other floristic surveys.

APA, Harvard, Vancouver, ISO, and other styles

11

Foit, Franklin F., and Peter J. Mehringer. "Holocene tephra stratigraphy in four lakes in southeastern Oregon and northwestern Nevada, USA." Quaternary Research 85, no. 2 (March 2016): 218–26. http://dx.doi.org/10.1016/j.yqres.2015.12.008.

Full text

Abstract:

To better understand the regional tephra stratigraphy and chronology of northern Nevada and southern Oregon, tephras in archived cores, taken as part of the Steens Mountain Prehistory Project from four lakes, Diamond Pond, Fish and Wildhorse lakes in southeastern Oregon and Blue Lake in northwestern Nevada, were reexamined using more advanced electron microprobe analytical technology. The best preserved and most complete core from Fish Lake along with Wildhorse Lake hosted two tephras from Mt. Mazama (Llao Rock and the Climactic Mazama), a mid-Holocene basaltic tephra from Diamond Craters, Oregon, two Medicine Lake tephras and an unexpected late Holocene Chaos Crags (Mt. Lassen volcanic center) tephra which was also found in the other lakes. Blue Lake was the only lake that hosted a Devils Hill tephra from the Three Sisters volcano in west central Oregon. Another tephra from the Three Sisters Volcano previously reported in sediments of Twin Lakes in NE Oregon, has now been confirmed as Rock Mesa tephra. The Chaos Crags, Devils Hill and Rock Mesa tephras are important late Holocene stratigraphic markers for central and eastern Oregon and northwestern Nevada.

APA, Harvard, Vancouver, ISO, and other styles

12

Di Fiori, Russell V., Sean P. Long, Anne C. Fetrow, Kathryn E. Snell, Joshua W. Bonde, and Jeff Vervoort. "Syncontractional deposition of the Cretaceous Newark Canyon Formation, Diamond Mountains, Nevada: Implications for strain partitioning within the U.S. Cordillera." Geosphere 16, no. 2 (January 6, 2020): 546–66. http://dx.doi.org/10.1130/ges02168.1.

Full text

Abstract:

Abstract The timing of deformation and deposition within syntectonic basins provides critical information for understanding the evolution of strain in mountain belts. In the U.S. Cordillera, contractional deformation was partitioned between the Sevier thrust belt in Utah and several structural provinces in the hinterland in Nevada. One hinterland province, the Central Nevada thrust belt (CNTB), accommodated up to ∼15 km of shortening; however, in most places, this deformation can only be bracketed between Permian and Eocene. Cretaceous deposits of the Newark Canyon Formation (NCF), which are sparsely exposed along the length of the CNTB, offer the opportunity to constrain deformation timing. Here, we present mapping and U-Pb zircon geochronology from the NCF in the Diamond Mountains, which demonstrate deposition of the NCF during proximal CNTB deformation. Deposition of the basal NCF member was under way no earlier than ca. 114 Ma, a tuff in the middle part of the section was deposited at ca. 103 Ma, and the youngest member was deposited no earlier than ca. 99 Ma. Intraformational angular unconformities and abrupt along- and across-strike thickness changes indicate that NCF deposition was related to growth of an east-vergent fault-propagation fold. Clast compositions define unroofing of upper Paleozoic sedimentary rocks, which we interpret as the progressive erosion of an anticline ∼10 km to the west. CNTB deformation was contemporaneous with shortening in the Sevier thrust belt, which defines middle Cretaceous strain partitioning between frontal and interior components of the Cordillera. Strain partitioning may have been promoted by renewed underthrusting during a period of high-flux magmatism.

APA, Harvard, Vancouver, ISO, and other styles

13

Lesins, G., L. Bourdages, T. J. Duck, J. R. Drummond, E. W. Eloranta, and V. P. Walden. "Large surface radiative forcing from topographic blowing snow residuals measured in the High Arctic at Eureka." Atmospheric Chemistry and Physics 9, no. 6 (March 16, 2009): 1847–62. http://dx.doi.org/10.5194/acp-9-1847-2009.

Full text

Abstract:

Abstract. Ice crystals, also known as diamond dust, are suspended in the boundary layer air under clear sky conditions during most of the Arctic winter in Northern Canada. Occasionally ice crystal events can produce significantly thick layers with optical depths in excess of 2.0 even in the absence of liquid water clouds. Four case studies of high optical depth ice crystal events at Eureka in the Nunavut Territory of Canada during the winter of 2006/07 are presented. They show that the measured ice crystal surface infrared downward radiative forcing ranged from 8 to 36 W m−2 in the wavelength band from 5.6 to 20 μm for 532 nm optical depths ranging from 0.2 to 1.7. MODIS infrared and visible images and the operational radiosonde wind profile were used to show that these high optical depth events were caused by surface snow being blown off 600 to 800 m high mountain ridges about 20 to 30 km North-West of Eureka and advected by the winds towards Eureka as they settled towards the ground within the highly stable boundary layer. This work presents the first study that demonstrates the important role that surrounding topography plays in determining the occurrence of high optical depth ice crystal events from residual blowing snow that becomes a source of boundary layer ice crystals distinct from the classical diamond dust phenomenon.

APA, Harvard, Vancouver, ISO, and other styles

14

Lesins, G., L. Bourdages, T. J. Duck, J. R. Drummond, E. W. Eloranta, and V. P. Walden. "Large surface radiative forcing from surface-based ice crystal events measured in the High Arctic at Eureka." Atmospheric Chemistry and Physics Discussions 8, no. 5 (September 29, 2008): 17691–737. http://dx.doi.org/10.5194/acpd-8-17691-2008.

Full text

Abstract:

Abstract. Ice crystals, also known as diamond dust, are suspended in the boundary layer air under clear sky conditions during most of the Arctic winter in Northern Canada. Occasionally ice crystal events can produce significantly thick layers with optical depths in excess of 2.0 even in the absence of liquid water clouds. Four case studies of high optical depth ice crystal events at Eureka in the Nunavut Territory of Canada during the winter of 2006–2007 are presented. They show that the measured ice crystal surface infrared downward radiative forcing ranged from 8 to 36 W m−2 in the wavelength band from 5.6 to 20 μm for visible optical depths ranging from 0.2 to 1.7. MODIS infrared and visible images and the operational radiosonde wind profile were used to show that these high optical depth events were caused by surface snow being blown off 600 to 800 m high mountain ridges about 20 to 30 km North-West of Eureka and advected by the winds towards Eureka as they settled towards the ground within the highly stable boundary layer. This work presents the first study that demonstrates the important role that surrounding topography plays in determining the occurrence of high optical depth ice crystal events and points to a new source of boundary layer ice crystal events distinct from the classical diamond dust phenomenon.

APA, Harvard, Vancouver, ISO, and other styles

15

Huang, Zhiqiang, Wenlin Zhang, Jing Zhu, Dou Xie, and Maolin Dai. "Research on variation law of geophysical drill-bit downhole flow field under the interaction of multiple hydraulic factors." Science Progress 104, no. 3 (July 2021): 003685042110316. http://dx.doi.org/10.1177/00368504211031683.

Full text

Abstract:

Mountain geophysical prospecting operations play an important role in the entire petroleum exploration field. Geophysical drill-bit is the main tool for mountain geophysical prospecting operations. Its hydraulic structure directly affects the downhole flow field and then affects the chip removal efficiency and drilling efficiency of the bit. At present, most of the scholars’ research is focused on Poly Diamond Crystalline bit, roller bit, etc., and the research on geophysical drill-bit is less, and most of them study the downhole flow field based on the change of single hydraulic structure. The primary objective of this research is to study the variation law of the downhole flow field under the interaction of multiple hydraulic structure factors. The drilling time and cuttings size of two geophysical drill-bits with different hydraulic structures are compared, and the key hydraulic structure factors are selected for analysis. Using numerical simulation software, take different levels of key hydraulic structure parameters and carry out orthogonal experiments. Under the interaction of various factors, study the flow field distribution in the flow channel, the downhole, and the annulus area of the shaft lining. The hydraulic structure of the geophysical drill-bit is closely related to the drilling speed and chip removal efficiency. When multiple hydraulic factors are changed, the diameter of the flow channel is the best when it is 10–12.5 mm, the inclination of the flow channel should be set as close as possible to the center of the downhole, and the length of the chip groove increases, the movement of cuttings is more stable. Variation law of downhole flow field under the interaction of multiple hydraulic factors is studied. This study provides a basis for the hydraulic structure design and optimization of the geophysical drill-bit.

APA, Harvard, Vancouver, ISO, and other styles

16

Strnad, Jiří (George). "The Discovery of Diamonds in Siberia and Other Northern Regions: Explorational, Historical, and Personal Notes." Earth Sciences History 10, no. 2 (January 1, 1991): 227–46. http://dx.doi.org/10.17704/eshi.10.2.5p14w9718430p46r.

Full text

Abstract:

Only four known diamond locations are near and north of the Arctic Circle. What is believed to be the oldest diamond find in this region was made in the gravels of the Pasvik River on the U.S.S.R.-Finland-Norway border. This was followed by the discovery of the northern fields of the Yakutian diamondiferous province in the U.S.S.R. Somerset Island in the Canadian Arctic Archipelago and southwestern Greenland conclude this short list. Geographically close to the Arctic but south of the Arctic Circle are the diamond locations on the shore of the Beloye More or White Sea and in the Timan Range (U.S.S.R.), western and eastern Alaska (U.S.A.), and in the Mackenzie Mountains (Canada). Farther south and partly in the Subarctic are locations in the Ural Mountains and Yakutia (U.S.S.R.), as well as in Labrador and Saskatchewan (Canada). While the discoveries in Canada and Greenland belong to our times, the history of the others is hidden in ancient records. For the Yakutian fields, which are of major economic importance and among the world leaders in the production of gem quality diamonds, an ancient reference dating back to 1375 is presented here for the first time.

APA, Harvard, Vancouver, ISO, and other styles

17

Gilmore, Bob. "Dübendorf : Radulescu's ‘Cinerum’." Tempo 59, no. 233 (June 21, 2005): 52–54. http://dx.doi.org/10.1017/s0040298205230231.

Full text

Abstract:

One of the consequences of the extreme paucity of new music broadcasting in Britain is that it is extraordinarily hard to keep up with the output of the major creative talents working in continental Europe. If we leave aside the already-canonical elder figures, only a handful of composers get anything like reasonable coverage (depending on one's definition of ‘reasonable’ — can one new work in four or five really be considered sufficient?). Others seem to have dropped out of listening range altogether. Such is the case with the Romanian-French composer Horatiu Radulescu, now 63 and by any standards one of the most fascinating and individual creative figures of his generation, whose music has been shamefully neglected by the BBC for more years than anyone would care to mention. Besides the usual sorts of prefabricated excuses why this is so (so many composers, so little available broadcast time), one speculates about further reasons. Is Radulescu's music considered simply too weird, too extreme, for Radio 3 listeners? Yes, his pieces are sometimes quite long; yes, they sometimes have strange titles (Capricorn's Nostalgic Crickets; Dizzy Divinity, I; Dr Kai Hong's Diamond Mountain); yes, they are sometimes not easy to digest at one listening. But isn't exposure to the cutting edge of the performing arts one of the things we should reasonably expect from our broadcasting media, especially in the case of a radical artist of such distinction and achievement?

APA, Harvard, Vancouver, ISO, and other styles

18

Nicholls, Elizabeth L., and Makoto Manabe. "A new genus of ichthyosaur from the Late Triassic Pardonet Formation of British Columbia: bridging the Triassic Jurassic gap." Canadian Journal of Earth Sciences 38, no. 6 (June 1, 2001): 983–1002. http://dx.doi.org/10.1139/e00-115.

Full text

Abstract:

Both the genus Shastasaurus and the family Shastasauridae have long been hard to define due to the fragmentary nature of the type specimens. Consequently, recent interpretations of the genus have been based almost entirely on Shastasaurus neoscapularis from the Late Triassic Pardonet Formation of British Columbia. Two new specimens of this taxon, from Pink Mountain, British Columbia, demonstrate that it does not belong in the genus Shastasaurus. This paper describes the new specimens, and refers the species to Metashastasaurus gen nov. Post-cranially, the skeleton of Metashastasaurus resembles that of shastasaurids, differing primarily only in the shape of the scapula and fibula. However, the skull has a unique combination of characters, including large diamond-shaped frontals that enter the supratemporal fenestrae, and very narrow posterior extensions of the nasals, which contact the postfrontals. It also differs from the skull of Shastasaurus in the presence of both a parietal ridge and postparietal shelf. This is a combination of derived characters previously known only in Jurassic forms. The front limb has four proximal carpals and four digits, indicating that previous reconstructions were based on incomplete material. Shastasaurus pacificus Merriam 1895, the type species of the genus Shastasaurus, must be considered a nomen dubium, making the genus Shastasaurus invalid. Until this problem is clarified, the use of the generic name Shastasaurus should be restricted to Merriam's type specimens, of which only Shastasaurus alexandrae and Shastasaurus osmonti are based on adequate material.

APA, Harvard, Vancouver, ISO, and other styles

19

Chen, Yunfeng, Yu Jeffrey Gu, Larry M. Heaman, Lei Wu, Erdinc Saygin, and Shu-Huei Hung. "Reconciling seismic structures and Late Cretaceous kimberlite magmatism in northern Alberta, Canada." Geology 48, no. 9 (May 29, 2020): 872–76. http://dx.doi.org/10.1130/g47163.1.

Full text

Abstract:

Abstract The Late Cretaceous kimberlites in northern Alberta, Canada, intruded into the Paleoproterozoic crust and represent a nonconventional setting for the discovery of diamonds. Here, we examined the origin of kimberlite magmatism using a multidisciplinary approach. A new teleseismic survey reveals a low-velocity (−1%) corridor that connects two deep-rooted (>200 km) quasi-cylindrical anomalies underneath the Birch Mountains and Mountain Lake kimberlite fields. The radiometric data, including a new U-Pb perovskite age of 90.3 ± 2.6 Ma for the Mountain Lake intrusion, indicate a northeast-trending age progression in kimberlite magmatism, consistent with the (local) plate motion rate of North America constrained by global plate reconstructions. Taken together, these observations favor a deep stationary (relative to the lower mantle) source region for kimberlitic melt generation. Two competing models, mantle plume and slab subduction, can satisfy kinematic constraints and explain the exhumation of ultradeep diamonds. The plume hypothesis is less favorable due to the apparent age discrepancy between the oldest kimberlites (ca. 90 Ma) and the plume event (ca. 110 Ma). Alternatively, magma generation may have been facilitated by decompression of hydrous phases (e.g., wadsleyite and ringwoodite) within the mantle transition zone in response to thermal perturbations by a cold slab. The three-dimensional lithospheric structures largely controlled melt migration and intrusion processes during the Late Cretaceous kimberlite magmatism in northern Alberta.

APA, Harvard, Vancouver, ISO, and other styles

20

Naipal, Renoesha, J. C. Hanco Zwaan, Salomon B. Kroonenberg, Leo M. Kriegsman, and Paul R. D. Mason. "Diamonds from the Nassau Mountains, Suriname." Journal of Gemmology 37, no. 2 (2020): 180–91. http://dx.doi.org/10.15506/jog.2020.37.2.180.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Niedermann, Ph, W. Hänni, S. Thurre, M. Gjoni, A. Perret, N. Skinner, P. F. Indermühle, U. Staufer, and N. F. de Rooij. "Mounting of micromachined diamond tips and cantilevers." Surface and Interface Analysis 27, no. 5-6 (May 1999): 296–98. http://dx.doi.org/10.1002/(sici)1096-9918(199905/06)27:5/6<296::aid-sia497>3.0.co;2-e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

MIZUTANI, Katsumi, and Hiroshi NAKO. "Spring Constant of Grain Mounting of Diamond Wheel." Journal of the Japan Society for Precision Engineering 60, no. 3 (1994): 412–16. http://dx.doi.org/10.2493/jjspe.60.412.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Bednarski, Jan M. "Landform assemblages produced by the Laurentide Ice Sheet in northeastern British Columbia and adjacent Northwest Territories — constraints on glacial lakes and patterns of ice retreatThis article is one of a selection of papers published in this Special Issue on the theme Geology of northeastern British Columbia and northwestern Alberta: diamonds, shallow gas, gravel, and glaciers." Canadian Journal of Earth Sciences 45, no. 5 (May 2008): 593–610. http://dx.doi.org/10.1139/e07-053.

Full text

Abstract:

The Laurentide Ice Sheet reached the Canadian Cordillera during the last glacial maximum in northeastern British Columbia and adjacent Northwest Territories and all regional drainage to unglaciated areas in the north was dammed by the ice. Converging ice-flow patterns near the mountain front suggest that the Laurentide Ice Sheet likely coalesced with the Cordilleran Ice Sheet during the last glaciation. With deglaciation, the ice masses separated, but earlier ice retreat in the south meant that meltwater pooled between the mountain front and the Laurentide margin. The level of the flooding was controlled by persistent ice cover on the southern Franklin Mountains. Glacial Lake Liard formed when the Laurentide Ice Sheet retreated east of the southern Liard Range and, at its maximum extent, may have impounded water at least as far south as the Fort Nelson River. Deglaciation of the plains was marked by local variations in ice flow caused by a thin ice sheet becoming more affected by the topography and forming lobes in places. These lobes caused diversions in local drainage readily traced by abandoned meltwater channels. Radiocarbon ages from adjacent areas suggest the relative chronology of deglaciation presented here occurred between 13 and 11 ka BP.

APA, Harvard, Vancouver, ISO, and other styles

24

G., Dill Harald. "Gems and Placers—A Genetic Relationship Par Excellence." Minerals 8, no. 10 (October 19, 2018): 470. http://dx.doi.org/10.3390/min8100470.

Full text

Abstract:

Gemstones form in metamorphic, magmatic, and sedimentary rocks. In sedimentary units, these minerals were emplaced by organic and inorganic chemical processes and also found in clastic deposits as a result of weathering, erosion, transport, and deposition leading to what is called the formation of placer deposits. Of the approximately 150 gemstones, roughly 40 can be recovered from placer deposits for a profit after having passed through the “natural processing plant” encompassing the aforementioned stages in an aquatic and aeolian regime. It is mainly the group of heavy minerals that plays the major part among the placer-type gemstones (almandine, apatite, (chrome) diopside, (chrome) tourmaline, chrysoberyl, demantoid, diamond, enstatite, hessonite, hiddenite, kornerupine, kunzite, kyanite, peridote, pyrope, rhodolite, spessartine, (chrome) titanite, spinel, ruby, sapphire, padparaja, tanzanite, zoisite, topaz, tsavorite, and zircon). Silica and beryl, both light minerals by definition (minerals with a density less than 2.8–2.9 g/cm3, minerals with a density greater than this are called heavy minerals, also sometimes abbreviated to “heavies”. This technical term has no connotation as to the presence or absence of heavy metals), can also appear in some placers and won for a profit (agate, amethyst, citrine, emerald, quartz, rose quartz, smoky quartz, morganite, and aquamarine, beryl). This is also true for the fossilized tree resin, which has a density similar to the light minerals. Going downhill from the source area to the basin means in effect separating the wheat from the chaff, showcase from the jeweler quality, because only the flawless and strongest contenders among the gemstones survive it all. On the other way round, gem minerals can also be used as pathfinder minerals for primary or secondary gemstone deposits of their own together with a series of other non-gemmy material that is genetically linked to these gemstones in magmatic and metamorphic gem deposits. All placer types known to be relevant for the accumulation of non-gemmy material are also found as trap-site of gemstones (residual, eluvial, colluvial, alluvial, deltaic, aeolian, and marine shelf deposits). Running water and wind can separate minerals according to their physical-chemical features, whereas glaciers can only transport minerals and rocks but do not sort and separate placer-type minerals. Nevertheless till (unconsolidated mineral matter transported by the ice without re-deposition of fluvio-glacial processes) exploration is a technique successfully used to delineate ore bodies of, for example, diamonds. The general parameters that matter during accumulation of gemstones in placers are their intrinsic value controlled by the size and hardness and the extrinsic factors controlling the evolution of the landscape through time such as weathering, erosion, and vertical movements and fertility of the hinterland as to the minerals targeted upon. Morphoclimatic processes take particular effect in the humid tropical and mid humid mid-latitude zones (chemical weathering) and in the periglacial/glacial and the high-altitude/mountain zones, where mechanical weathering and the paleogradients are high. Some tectono-geographic elements such as unconformities, hiatuses, and sequence boundaries (often with incised valley fills and karstic landforms) are also known as planar architectural elements in sequence stratigraphy and applied to marine and correlative continental environments where they play a significant role in forward modeling of gemstone accumulation. The present study on gems and gemstone placers is a reference example of fine-tuning the “Chessboard classification scheme of mineral deposits” [1] and a sedimentary supplement to the digital maps that form the core of the overview “Gemstones and geosciences in space and time” [2].

APA, Harvard, Vancouver, ISO, and other styles

25

Laiginhas, Fernando, D. Graham Pearson, David Phillips, Ray Burgess, and Jeff W. Harris. "Re–Os and 40Ar/39Ar isotope measurements of inclusions in alluvial diamonds from the Ural Mountains: Constraints on diamond genesis and eruption ages." Lithos 112 (November 2009): 714–23. http://dx.doi.org/10.1016/j.lithos.2009.03.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Weiss, S., E. Zakel, and H. Reichl. "Mounting of high power laser diodes on diamond heatsinks." IEEE Transactions on Components, Packaging, and Manufacturing Technology: Part A 19, no. 1 (March 1996): 46–53. http://dx.doi.org/10.1109/95.486562.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Vedeler, Marianne, and Lise Bender Jørgensen. "Out of the Norwegian glaciers: Lendbreen—a tunic from the early first millennium AD." Antiquity 87, no. 337 (September 1, 2013): 788–801. http://dx.doi.org/10.1017/s0003598x00049462.

Full text

Abstract:

As the temperature rises each year, the assemblages of prehistoric hunters emerge from the ice. Archaeologists in Norway are now conducting regular surveys in the mountains to record the new finds. A recent example presented here consists of a whole tunic, made of warm wool and woven in diamond twill. The owner, who lived in the late Iron Age (third–fourth centuries AD), was wearing well-worn outdoor clothing, originally of high quality.

APA, Harvard, Vancouver, ISO, and other styles

28

Bae, Hyungdae, Ayush Giri, Oluwafikunwa Kolawole, Amin Azimi, Aaron Jackson, and Gary Harris. "Miniature Diamond-Based Fiber Optic Pressure Sensor with Dual Polymer-Ceramic Adhesives." Sensors 19, no. 9 (May 13, 2019): 2202. http://dx.doi.org/10.3390/s19092202.

Full text

Abstract:

Diamond is a good candidate for harsh environment sensing due to its high melting temperature, Young’s modulus, and thermal conductivity. A sensor made of diamond will be even more promising when combined with some advantages of optical sensing (i.e., EMI inertness, high temperature operation, and miniaturization). We present a miniature diamond-based fiber optic pressure sensor fabricated using dual polymer-ceramic adhesives. The UV curable polymer and the heat-curing ceramic adhesive are employed for easy and reliable optical fiber mounting. The usage of the two different adhesives considerably improves the manufacturability and linearity of the sensor, while significantly decreasing the error from the temperature cross-sensitivity. Experimental study shows that the sensor exhibits good linearity over a pressure range of 2.0–9.5 psi with a sensitivity of 18.5 nm/psi (R2 = 0.9979). Around 275 °C of working temperature was achieved by using polymer/ceramic dual adhesives. The sensor can benefit many fronts that require miniature, low-cost, and high-accuracy sensors including biomedical and industrial applications. With an added antioxidation layer on the diamond diaphragm, the sensor can also be applied for harsh environment applications due to the high melting temperature and Young’s modulus of the material.

APA, Harvard, Vancouver, ISO, and other styles

29

Kolodziej, Tomasz, Preeti Vodnala, Sergey Terentyev, Vladimir Blank, and Yuri Shvyd'ko. "Diamond drumhead crystals for X-ray optics applications." Journal of Applied Crystallography 49, no. 4 (July 14, 2016): 1240–44. http://dx.doi.org/10.1107/s1600576716009171.

Full text

Abstract:

Thin (<50 µm) and flawless diamond single crystals are essential for the realization of numerous advanced X-ray optical devices at synchrotron radiation and free-electron laser facilities. The fabrication and handling of such ultra-thin components without introducing crystal damage and strain is a challenge. Drumhead crystals, monolithic crystal structures composed of a thin membrane furnished with a surrounding solid collar, are a solution ensuring mechanically stable strain-free mounting of the membranes with efficient thermal transport. Diamond, being one of the hardest and most chemically inert materials, poses significant difficulties in fabrication. Reported here is the successful manufacture of diamond drumhead crystals in the [100] orientation using picosecond laser milling. Subsequent high-temperature treatment appears to be crucial for the membranes to become defect free and unstrained, as revealed by X-ray topography on examples of drumhead crystals with a 26 µm thick (1 mm in diameter) and a 47 µm thick (1.5 × 2.5 mm) membrane.

APA, Harvard, Vancouver, ISO, and other styles

30

Pugh, E., and R. K. W. Haselwimmer. "Electroplated mounting of diamond anvils for use in cryogenic systems." Review of Scientific Instruments 77, no. 8 (August 2006): 085103. http://dx.doi.org/10.1063/1.2238692.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

(김광조)金光朝. "Aspects of the Depiction of Natural Scenery in Diamond Mountains Travel Poetry." Society for Korean Language & Literary Research 35, no. 4 (December 2007): 361–82. http://dx.doi.org/10.15822/skllr.2007.35.4.361.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Yi, Kwang-su, and Ellie Choi. "Record of Travels in the Diamond Mountains (Kŭmgangsan yugi, 1922) Motivations (Tonggi)." Azalea: Journal of Korean Literature & Culture 4, no. 1 (2011): 347–50. http://dx.doi.org/10.1353/aza.2011.0006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Colesie, Claudia, Maxime Gommeaux, T. G. Allan Green, and Burkhard Büdel. "Biological soil crusts in continental Antarctica: Garwood Valley, southern Victoria Land, and Diamond Hill, Darwin Mountains region." Antarctic Science 26, no. 2 (May 23, 2013): 115–23. http://dx.doi.org/10.1017/s0954102013000291.

Full text

Abstract:

AbstractBiological soil crusts are associations of lichens, mosses, algae, cyanobacteria, microfungi and bacteria in different proportions forming a thin veneer within the top centimetres of soil surfaces. They occur in all biomes, but particularly in arid and semi-arid regions, even in the most extreme climates. They carry out crucial ecosystem functions, such as soil stabilization, influencing water and nutrient cycles, and contribute to the formation of microniches for heterotrophic life. In continental Antarctica especially, these roles are essential because no higher plants provide such ecosystem services. We provide a detailed description of biological soil crusts from Garwood Valley, McMurdo Dry Valleys region (78°S) and Diamond Hill (80°S) in the Darwin Mountains region. The coverage was low at 3.3% and 0.8% of the soil surface. At Garwood Valley the crusts were composed of green algal lichens, cyanobacteria, several species of green algae and the mossHennediella heimii(Hedw.) R.H. Zander. Diamond Hill crusts appear to be unique in not having any species of cyanobacteria. Major parts are embedded in the soil, and their thickness correlates with higher chlorophyll contents, higher soil organic carbon and nitrogen, which are fundamental components of this species poor cold desert zone.

APA, Harvard, Vancouver, ISO, and other styles

34

Giese, C., G. Lewes-Malandrakis, J. de Sanoit, M. Pomorski, and C. Nebel. "Towards Alpha Radiation Detection in Aqueous Solution: VLSI Technology Development for Diamond-Silicon Hybrid Sensors." MRS Proceedings 1788 (2015): 49–55. http://dx.doi.org/10.1557/opl.2015.835.

Full text

Abstract:

ABSTRACTIn the presented work, we have developed VLSI technology processes for new prototype sensors based on the synthesis of boron doped nanocrystalline diamond (B-NCD) and silicon based commercial detectors. The process is based on commercial passivated implanted planar silicon (PIPS) devices of PD450 and CAM450 types (CANBERRA). A layer of B-NCD of several hundred nanometers thickness and boron concentration up to 1021 atoms/cm3 is grown on the SiOx passivation layer in an ellipsoidal plasma enhanced chemical vapor deposition (PECVD) reactor at temperatures from 520-750°C, in hydrogen atmosphere. . The diamond electrode is dry chemically structured and aluminum electrodes are realized before mounting in a three-fold housing for measurements in aqueous solution. The prototype sensors show an alpha spectroscopy resolution of 100 keV for 241Am electroprecipitated from liquid solution.

APA, Harvard, Vancouver, ISO, and other styles

35

Kravchinsky, Vadim A., D. Roy Eccles, Rui Zhang, and Matthew Cannon. "Paleomagnetic dating of the northern Alberta kimberlites." Canadian Journal of Earth Sciences 46, no. 4 (April 2009): 231–45. http://dx.doi.org/10.1139/e09-016.

Full text

Abstract:

Due to the vast amount of economic interest diamonds have created in northern Alberta, there is a need to produce an accurate geological model for the northern Alberta kimberlite province. To aid in the development of such a model, the emplacement ages of two kimberlite occurrences, K5 and K6 from the Buffalo Head Hills region of north-central Alberta, and the ultramafic Mountain Lake body from northwestern Alberta were estimated using paleomagnetic methods. Paleomagnetic poles obtained in our study do not differ statistically from the reference poles for late Mesozoic – Cenozoic for North America ( Besse and Courtillot 2002 ). With the aid of polarity determinations, palynology, and radiogenic dating, the paleomagnetic results allow for new constraints on the emplacement age of the selected ultramafic occurrences. The paleomagnetic emplacement ages established for the K5, K6, and Mountain Lake bodies are 90–83 Ma, 83.0–79.1 Ma, and not older than 79.1 Ma, respectively.

APA, Harvard, Vancouver, ISO, and other styles

36

Roeder, Marcel, Marc Drexler, Thilo Rothermel, Thomas Meissner, Thomas Guenther, and André Zimmermann. "Injection Compression Molded Microlens Arrays for Hyperspectral Imaging." Micromachines 9, no. 7 (July 18, 2018): 355. http://dx.doi.org/10.3390/mi9070355.

Full text

Abstract:

In this work, a polymer microlens array (MLA) for a hyperspectral imaging (HSI) system is produced by means of ultraprecision milling (UP-milling) and injection compression molding. Due to the large number of over 12,000 microlenses on less than 2 cm², the fabrication process is challenging and requires full process control. The study evaluates the process chain and optimizes the single process steps to achieve high quality polymer MLAs. Furthermore, design elements like mounting features are included to facilitate the integration into the final HSI system. The mold insert was produced using ultraprecision milling with a diamond cutting tool. The machining time was optimized to avoid temperature drifts and enable high accuracy. Therefore, single immersions of the diamond tool at a defined angle was used to fabricate each microlens. The MLAs were replicated using injection compression molding. For this process, an injection compression molding tool with moveable frame plate was designed and fabricated. The structured mold insert was used to generate the compression movement, resulting in a homogeneous pressure distribution. The characterization of the MLAs showed high form accuracy of the microlenses and the mounting features. The functionality of the molded optical part could be demonstrated in an HIS system by focusing light spectrums onto a CCD image sensor.

APA, Harvard, Vancouver, ISO, and other styles

37

Xu, Shutong, and Wen Su. "Raman determination on micro-diamond in eclogite from the Dabie Mountains, Eastern China." Chinese Science Bulletin 42, no. 1 (January 1997): 87. http://dx.doi.org/10.1007/bf02882534.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Takiya, Toshio, Hiroshi Sugiyama, Xiaowei Zhang, Shoichi Shimada, Kunihiko Yamazato, Akio Komura, and Masami Ando. "New mounting method of diamond monochromator for high brilliance synchrotron radiation." Review of Scientific Instruments 70, no. 9 (September 1999): 3523–28. http://dx.doi.org/10.1063/1.1149954.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Gent, D. H., R. R. Martin, and C. M. Ocamb. "First Report of Iris yellow spot virus on Onion and Leek in Western Oregon." Plant Disease 91, no. 4 (April 2007): 468. http://dx.doi.org/10.1094/pdis-91-4-0468a.

Full text

Abstract:

Onion (Allium cepa) and leek (Allium porrum) are grown on approximately 600 ha in western Oregon annually for bulb and seed production. During July and August of 2006, surveys of onion bulb crops and onion and leek seed crops in western Oregon found plants with symptoms of elongated to diamond-shaped, straw-colored lesions characteristic of those caused by Iris yellow spot virus (IYSV) (1–4). Symptomatic plants were collected from fields of an onion bulb crop, an onion seed crop, and two leek seed crops located in Marion County. The onion bulb crop had been planted in the spring of 2006, and the onion and leek seed crops had been planted in the fall of 2005, all direct seeded. Cultivar names were not provided for proprietary purposes. Symptomatic plants in the onion bulb crop and leek seed crop generally were found near the borders of the field. Disease incidence was less than 5% and yield losses in these crops appeared to be negligible. In the onion seed crop, symptomatic plants were found throughout the field and disease incidence was approximately 20%. Approximately 1% of the onion plants in this field had large necrotic lesions that caused the seed stalks (scapes) to lodge. The presence of IYSV was confirmed from symptomatic leaves and scapes by ELISA (Agdia Inc., Elkhart, IN) using antiserum specific to IYSV. RNA was extracted from symptomatic areas of onion leaves and scapes, and a portion of the nucleocapsid gene was amplified by reverse transcription-PCR. The amplicons were sequenced and found to share more than 99% nucleotide and amino acid sequence identity with an onion isolate of IYSV from the Imperial Valley of California (GenBank Accession No. DQ233475). In the Pacific Northwest region of the United States, IYSV has been confirmed in the semi-arid regions of central Oregon (1), central Washington (2), and the Treasure Valley of eastern Oregon and southwest Idaho (3). To our knowledge, this is the first report of the disease on a host crop in the mild, maritime region west of the Cascade Mountain Range and the first report of IYSV on leek seed crops in the United States, which complements a simultaneous report of IYSV on commercial leek in Colorado. The presence of IYSV may have implications for the iris and other ornamental bulb industries in western Oregon and western Washington. This report underscores the need for further research to determine the impact of the disease on allium crops and other hosts and the development of effective management programs for IYSV and the vector, Thrips tabaci. References: (1) F. J. Crowe and H. R. Pappu. Plant Dis. 89:105, 2005. (2) L. J. du Toit et al. Plant Dis. 88:222, 2004. (3) J. M. Hall et al. Plant Dis. 77:952, 1993. (4) H. F. Schwartz et al. Plant Dis. 91:113, 2007.

APA, Harvard, Vancouver, ISO, and other styles

40

Langourov, Mario. "NEW DATA ON THE BUTTERFLIES OF WESTERN STARA PLANINA MTS (BULGARIA & SERBIA) (LEPIDOPTERA, PAPILIONOIDEA)." Ecologica Montenegrina 20 (March 9, 2019): 119–62. http://dx.doi.org/10.37828/em.2019.20.12.

Full text

Abstract:

The paper represents results of surveys carried out in the Western Stara Planina Mts within the last four years in order to improve the knowledge of the butterfly fauna, especially in the Bulgarian part of the mountain. A total of 150 species of Lepidoptera (Papilionoidea) was recorded with comments on their distribution in the Bulgarian part of the studied region. Nineteen species were recorded for the first time in the Bulgarian part of the mountain and one species (Apatura metis) – for the Serbian part. It has been found that the highest butterfly diversity is linked to the largest limestone area in the mountain near Komshtitsa Village where 101 species were observed. Interesting records for some rare or endangered species (Muschampia cribrellum, M. tessellum, Lycaena helle, Kirinia climene, Apatura metis, Nymphalis vaualbum, Melitaea didyma, M. arduinna, M. diamina and Brenthis ino) are discussed in detail. The high conservation value of the studied region proves by the species considered as threatened at the European level, of which seven species are included in the Annexes II and IV of the Habitats Directive, 12 species are listed in the Red Data Book of European butterflies and 26 in the European Red List of Butterflies.

APA, Harvard, Vancouver, ISO, and other styles

41

Chervach, Yu B., V. A. Mezentsev, N. E. Galin, and A. B. Kim. "Analysis of Force Dependences of Diamond Burnishing with Different Types of Burnishing Tools." Applied Mechanics and Materials 756 (April 2015): 8–14. http://dx.doi.org/10.4028/www.scientific.net/amm.756.8.

Full text

Abstract:

The article presents the results of studies on measuring components of force of diamond burnishing of surfaces with variable radius of curvature. The impact of structural elements of burnishing tools of different types on components of burnishing force was analyzed. The impact of different actuators of burnishing tools on components of burnishing force was analyzed. The design of the burnishing tool with an air receiver (bellows with compressed air as an actuator) with a parallelogram-type mounting of the indenter on the four flat posts, which ensures burnishing of profiled and other types of surfaces with constant force Py, was proposed.

APA, Harvard, Vancouver, ISO, and other styles

42

KOVENSKY, Alexander E., Vladimir L. BASINIUK, and Ryta E. VOLKOTRUB. "METHOD OF SELECTING THE OPERATION PARAMETERS OF ELECTRIC SPINDLE WITH AEROSTATIC SUPPORTS FOR SEPARATION OF SEMICONDUCTOR PLATES TO CRYSTALS. PARTS 2–3." Mechanics of Machines, Mechanisms and Materials 3, no. 56 (September 2021): 25–41. http://dx.doi.org/10.46864/1995-0470-2021-3-56-25-41.

Full text

Abstract:

The article presents the results of studies of the shaft oscillation processes of a precision horizontal highspeed electric spindle with aerostatic radial and axial supports, used at Planar OJSC in equipment for separation of semiconductor plates into crystals. The studies were carried out using the developed mathematical models that take into account the design features of these electric spindles, including the cantilever mounting of the cutting tool, the imbalance of the diamond disc with the mandrel and the mass ratio of the main components of the electric spindle, as well as the results of their full-scale tests. Based on the analysis of the data obtained, regularities are shown that connect the amplitude values of the oscillations of the electric spindle shaft with the imbalance of the diamond disc with the mandrel and the rotational speed of the electric spindle, which made it possible to propose engineering dependences for choosing the permissible values of the imbalance and rational, from the standpoint of resonance conditions and permissible shaft oscillations, rotational speed of the electric spindle. Recommendations have been developed for the creation of a system for monitoring and active control of the parameters and functioning of the electric spindle in the process of separating semiconductor plates into crystals, which make it possible to use the resonant mode of radial oscillations to improve cutting conditions, excluding direct contact of the working surfaces of aerostatic supports, their seizure and loss of performance of the electric spindle. The article presents a method of selecting the operation parameters of a high-speed precision horizontal electric spindle with aerostatic radial and axial supports and a cantilever mounting of a diamond cutting disc. It is based on the analysis of the simulation results of shaft forced oscillations and data on the shaft oscillations during the operation of the electric spindle with different rotation frequencies and imbalances. The results obtained can be used to monitor shaft oscillations during the operation of the electric spindle, while the high operation efficiency of which is achieved by adaptive control of rotation frequencies taking into account the amplitudes of these oscillations.

APA, Harvard, Vancouver, ISO, and other styles

43

Stoupin, S., S. A. Terentyev, V. D. Blank, Yu V. Shvyd'ko, K. Goetze, L. Assoufid, S. N. Polyakov, et al. "All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source." Journal of Applied Crystallography 47, no. 4 (August 1, 2014): 1329–36. http://dx.doi.org/10.1107/s1600576714013028.

Full text

Abstract:

A double-crystal diamond (111) monochromator recently implemented at the Linac Coherent Light Source (LCLS) enables splitting of the primary X-ray beam into a pink (transmitted) and a monochromatic (reflected) branch. The first monochromator crystal, with a thickness of ∼100 µm, provides sufficient X-ray transmittance to enable simultaneous operation of two beamlines. This article reports the design, fabrication and X-ray characterization of the first and second (300 µm-thick) crystals utilized in the monochromator and the optical assemblies holding these crystals. Each crystal plate has a region of about 5 × 2 mm with low defect concentration, sufficient for use in X-ray optics at the LCLS. The optical assemblies holding the crystals were designed to provide mounting on a rigid substrate and to minimize mounting-induced crystal strain. The induced strain was evaluated using double-crystal X-ray topography and was found to be small over the 5 × 2 mm working regions of the crystals.

APA, Harvard, Vancouver, ISO, and other styles

44

Hsu, Cheng Yi, and Yu Li Lin. "Thermal Characteristics of High-Power LED Packages with Dissipation Film." Applied Mechanics and Materials 397-400 (September 2013): 1767–71. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1767.

Full text

Abstract:

A simple, fast, and reliable characterization method for measuring junction temperature (Tj) on high power GaN-based light emitting diodes (LED) was presented in this study. Thermal characteristics of high power Light-emitting-diode have been analyzed by using a three-dimensional thermal conduction model. Maximum operation temperature has also been calculated. The induced thermal behaviors of the best package processes for LED device with diamond film were investigated by finite element analysis (FEA) and by experimental measurement. The large change of forward operation voltage with temperature in light emitting diodes is advantageously used to measure junction temperature. Using this method, junction temperature (Tj) of LED under various structures and chip mounting methods was measured. It was found that the junction temperature can be reduced considerably by using diamond film substrates to replace sapphire substrate. In this study, the junction temperature can be decreased by about 14.3% under 1.5W power and decreased by about 15.9% under 1W power for 1mm square die. The thermal resistance (RT) can be measured to be 14.8°C/W under 1.5W power and 16.6°C/W under 1.W power.

APA, Harvard, Vancouver, ISO, and other styles

45

Wright, Nathan David, Patrick Collins, Lizbé Koekemoer, Tobias Krojer, Romain Talon, Elliot Nelson, Mingda Ye, et al. "The low-cost Shifter microscope stage transforms the speed and robustness of protein crystal harvesting." Acta Crystallographica Section D Structural Biology 77, no. 1 (January 1, 2021): 62–74. http://dx.doi.org/10.1107/s2059798320014114.

Full text

Abstract:

Despite the tremendous success of X-ray cryo-crystallography in recent decades, the transfer of crystals from the drops in which they are grown to diffractometer sample mounts remains a manual process in almost all laboratories. Here, the Shifter, a motorized, interactive microscope stage that transforms the entire crystal-mounting workflow from a rate-limiting manual activity to a controllable, high-throughput semi-automated process, is described. By combining the visual acuity and fine motor skills of humans with targeted hardware and software automation, it was possible to transform the speed and robustness of crystal mounting. Control software, triggered by the operator, manoeuvres crystallization plates beneath a clear protective cover, allowing the complete removal of film seals and thereby eliminating the tedium of repetitive seal cutting. The software, either upon request or working from an imported list, controls motors to position crystal drops under a hole in the cover for human mounting at a microscope. The software automatically captures experimental annotations for uploading to the user's data repository, removing the need for manual documentation. The Shifter facilitates mounting rates of 100–240 crystals per hour in a more controlled process than manual mounting, which greatly extends the lifetime of the drops and thus allows a dramatic increase in the number of crystals retrievable from any given drop without loss of X-ray diffraction quality. In 2015, the first in a series of three Shifter devices was deployed as part of the XChem fragment-screening facility at Diamond Light Source, where they have since facilitated the mounting of over 120 000 crystals. The Shifter was engineered to have a simple design, providing a device that could be readily commercialized and widely adopted owing to its low cost. The versatile hardware design allows use beyond fragment screening and protein crystallography.

APA, Harvard, Vancouver, ISO, and other styles

46

Gebhardt, Andreas, Matthias Beier, Erik Schmidt, Thomas Rendel, Ute Gawronski, and Eyk Gebhardt. "Effective Optical System Assembly Using Ultra-Precise Manufactured References." International Journal of Automation Technology 14, no. 4 (July 5, 2020): 644–53. http://dx.doi.org/10.20965/ijat.2020.p0644.

Full text

Abstract:

The present work demonstrates that exactly manufactured references for joining, mounting, and metrology purposes are crucial in the effective assembly of high-quality optical systems. Based on the alignment turning of spherical and aspherical lenses, the proposed approach can be transferred to non-rotational symmetric elements such as prisms, active components (e.g., laser diodes), and freeform mirrors. The complexity of the optical component decides whether on-machine metrology or specific measurement setups need to be used to determine the position and orientation of the references with respect to the optical function. The resulting correction data are considered during the machining process. The subsequent correction cycle realizes mounting and metrology references down to sub-micron precision using diamond-machining techniques. This approach facilitates the assembly of demanding optical systems and even freeform arrangements in a predictable and passive manner. Different machining setups as well as the corresponding metrology approaches are demonstrated, and results are presented for representative components. The effectiveness of the approach is discussed using rotationally symmetrical lens systems and a snap-together freeform mirror system.

APA, Harvard, Vancouver, ISO, and other styles

47

Birkett, T. C., T. E. McCandless, and C. T. Hood. "Petrology of the Renard igneous bodies: host rocks for diamond in the northern Otish Mountains region, Quebec." Lithos 76, no. 1-4 (September 2004): 475–90. http://dx.doi.org/10.1016/j.lithos.2004.03.054.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Song, Nianshen. "To the Diamond Mountains: A Hundred-Year Journey through China and Korea, written by Tessa Morris-Suzuki." China and Asia 1, no. 1 (February 11, 2019): 132–34. http://dx.doi.org/10.1163/2589465x-00101007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Vityk, Maxim O., Robert J. Bodnar, and Igor V. Dudok. "Fluid inclusions in “Marmarosh Diamonds”: evidence for tectonic history of the Folded Carpathian Mountains, Ukraine." Tectonophysics 255, no. 1-2 (April 1996): 163–74. http://dx.doi.org/10.1016/0040-1951(95)00128-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Tennent, W. J., and D. K. Mitchell. "A brief historical account of an endemic swallowtail butterfly first collected a century ago on Goodenough Island (D'Entrecasteaux group) in Papua New Guinea." Archives of Natural History 44, no. 1 (April 2017): 159–69. http://dx.doi.org/10.3366/anh.2017.0424.

Full text

Abstract:

Graphium weiskei goodenovii Rothschild, 1915 (Lepidoptera: Papilionidae) has been known for over a century only from two male specimens: one in the Natural History Museum, London; the other in the Oxford University Museum of Natural History (OUMNH). Endemic to Goodenough Island, in the D'Entrecasteaux group, Papua New Guinea, it was first collected on the summit of ‘Oiamadawa'a (Mount Madawaa, Mount Madara'a) in 1912 by New Zealand anthropologist Diamond Jenness. The second specimen, which became the holotype, was collected in mountains in the south of the island by Albert Stewart Meek, one of Walter, Lord Rothschild's most prolific collector/explorers for his museum at Tring in Hertfordshire. In each case, capture of specimens was sufficiently notable to be recorded contemporaneously by the captors. These data, and maps and photographs made by the collectors suggest that the butterfly was widespread at moderate to high elevations on Goodenough Island. The authors climbed ‘Oiamadawa'a in 2015 and collected further specimens, now deposited in OUMNH.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Diamond Mountain'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles