排序方式： 共有11条查询结果，搜索用时 31 毫秒
1.
土地资源是地球资源的重要组成部分,目前全球城市化进程正快速推进,土地资源已成为城市资源的重要组成部分,土地资源在城市发展中占用重要的作用.城市建设快速发展的同时,基础薄弱、城市控规覆盖范围小、土地储备开发信息化基础差等现实问题,造成土地征收、整合、储备、出让周期长、效率低,无法满足城市快速发展对土地的应用需求.为解决以上问题,更好地促进城市健康发展,本文从区县级土地储备信息平台自动化管理的角度出发,从平台搭建、思路、实现等方面进行探讨,并以实际案例进行论证,表明区县级土地储备信息平台自动化管理建设具有可行性. 相似文献
2.
Marc H. Hanke J. David Lambert Kelly J. Smith 《International journal of geographical information science》2014,28(8):1642-1657
A critical component of maintaining biodiversity in fragmented habitats is maintaining connectivity among the usable fragments. Least cost path (LCP) analysis is a tool that can be used for predicting the ability of an organism to move from one habitat patch to another, based on geographical features of the landscape and life history traits of the organism. While this analysis has been utilized for terrestrial habitats, it is rarely applied to aquatic environments. Aquatic hypoxic conditions occur when dissolved oxygen falls below 2 mg/L. These conditions can create barriers in the water column that can either force fish to leave a habitat, or avoid that habitat altogether. Using the lower St. Johns River (LSJR) estuary in Florida, USA, as a study system, the ability of an adult silver perch, Bairdiella chrysoura, to escape a large-scale hypoxic event was modeled using a multicriteria LCP approach. Criteria-specific cost grids were constructed based upon current speed, risk of predation, and whether oxygen levels in the habitat area were normoxic (>5.5 mg/L), or hypoxic (<2.0–1.5 mg/L) as a function of water depth for the LSJR. The criteria cost grids were combined using relative weighting to produce the multicriteria cost grid used to implement the LCP analysis. Three origin and destination point locations within the LSJR study area were selected for modeling whether or not a silver perch would be able to escape a hypoxic zone. Since the LCP model will always determine a LCP from the specified origin point location, ecologically relevant swimming capacities for silver perch under normoxic and hypoxic conditions were then applied to assess the model, and to determine whether the fish would be able to reach areas unimpacted by hypoxia. The LCP model and the swimming capacity results for this study predict that under normoxic conditions, fish movement was unimpeded. During the rapidly developing hypoxic event that was modeled, the results from the LCP model indicate that the fish could move outside the hypoxic zone, but when swimming capacities were applied to the model, the silver perch could not escape. Ecologically, the results of this study suggest that silver perch would experience high mortality under a rapidly developing hypoxic event. Additionally, the results of this study indicate that a LCP model can be applied to an aquatic habitat, as long as the cost grids incorporate relevant abiotic and biotic factors. 相似文献
3.
Prof W. H. Paar Dr. T. T. Chen Prof V. Kupcik Dr. U. Hanke 《Mineralogy and Petrology》1983,32(2-3):103-110
Zusammenfassung Eclarit kommt in goldführenden Kupfererzen in Bärenbad westlich des Hollersbachtales in SH 1600 m ca. 1.5 km nördlich der Bleiglanz-Zinkblende-Flußspat-Lagerstätte der Achsel-Alm vor. Eclarit tritt in fächerförmigen Gruppierungen nadelförmiger Kristalle bis zu 1,5 cm Länge und in Aggregaten xenomorpher Körner rißausfüllend in kataklastischem Pyrit und Arsenkies in einer Quarzmatrix auf. Weitere Begleiterze sind: Kupferkies, Pyrrhotin, Sphalerit, Stannit s.str., ein joseitähnliches Mineral, ged. Wismut und ged. Gold. Mikrosonden-Analysen zeigen nur geringfügige Variation im Chemismus von Kom zu Kom. Die mittlere Zusammensetzung ist: Cu 0,9, Fe 0,6, Ag 0,3, Pb 34,5, Bi 45,8, Sb 1,5 und S 17,3 Gew.-% (Summe: 100,7). Die durchKupcik (1983) durchgeführte Strukturuntersuchung führte zu folgender Formel: (Cu,Fe)Pb9(Bi,Sb)12S28, oder idealisiert: (Cu,Fe)Pb9Bi12S28. Die empirische Formel auf der Basis S=28 lautet daher: (Cu0,73 Fe0,57 Ag0,16) 1,46 Pb8,61 (Bi11,36 Sb0,62) 11,98 S28. Die daraus errechnete Dichte ist 6,88 g·cm–3, somit in guter Übereinstimmung mit dem gemessenen Wert von 6,85 g·cm–3. Eclarit kristallisiert orthorhombisch, RaumgruppePnma, und hat die Gitterkonstanten:a=54,76(4),b=4,030(3),c=22.75(3) Å,Z=4. Die stärksten Linien des Pulverdiagrammes sind: 3.63 (30) (905), 3.49 (40) (10.0.5, 606), 3.41 (100) (16.0.0, 811, 513, 712, 706), 3.01 (60) (0.15, 11.0.6, 115, 18.0.1), 2.89 (70) (11.1.3, 914), 2.74 (40) (216, 11.1.4, 116, 20.0.0), 2,14(50) (21.0.6, 119, 19.0.7, 019), 2,04(45) (16.1.7, 18.1.6, 22.1.3, 4.0.11), 2.01 (80) (020, 23.1.2, 5.0.11, 23.0.6), 1.73(35) (16.2.0, 10.2.5, 726). Eclarit ist weißgrau (Luft) bzw. bläulichgrau (Öl) gegen Bleiglanz, der Reflexionspleochroismus ist mittel bis deutlich, die Anisotropie deutlich (Luft) bzw. stark (Öl). Das Reflexionsvermögen in Luft gemessen bei den vier Standard-Wellenlängen ist: 480 nm: 51,2–45,2; 546 nm: 47,2–42,9; 589 um: 46,1–42,0; 644 nm: 45,0–40,2%. Die Mikrohärte (VHN50) ist 87–191 kp·mm–2, im Durchschnitt 163 kp·mm–2.
Mit 3 Abbildungen
Herrn Professor Dr.Josef Zemann zum 60. Geburtstag gewidmet. 相似文献
Eclarite, (Cu, Fe) Pb9Bi12S28, a new sulfosalt from Bärenbad, Hollersbachtal, Salzburg Province, Austria
Summary Eclarite has been observed in gold-bearing copper ores at Bärenbad W of Hollersbachtal (ev. 1600 m), about 1.5 km north of the galena-sphalerite-fluorite deposit Achsel-Alm, Salzburg Province, Austria. It occurs as fan shaped aggregates of needle-like crystals up to 1.5 cm length, or as granular fracture-fillings of pyrite and arsenopyrite. Other associated minerals are chalcopyrite, pyrrhotite, sphalerite, stannite s.str., a joseite-type mineral, native bismuth and native gold, in a matrix of quartz. Microprobe analyses showed the mineral to be homogeneous, with only very limited variation in chemistry from grain to grain. The composition is (mean value of 16 analyses); Cu 0.9, Fe 0.6, Ag 0.3, Pb 34.3, Bi 45.8, Sb 1.5 and S 17.3 wt.-% (total 100.7). The structure analysis (Kupcik, 1983) showed the structural cell formula to be (Cu,Fe)Pb9(Bi,Sb)12S28 or ideally (Cu,Fe)Pb9Bi12S28. The empirical formula calculated on the basis of S=28 is: (Cu0,73 Fe0,57 Ag0,16) 1,46 Pb8,61 (Bi11,36 Sb0,62) 11,98 S28. This gives a calculated density of 6.88, which is in good agreement with the measured value of 6.85 g·cm–3. Eclarite is orthorhombic,Pnma,a=54.76(4),b=4.030(3),c=22.75(3) Å,Z=4. The strongest lines in the powder diffraction pattern are: 3.63(30) (905), 3.49(40) (10.0.5, 606), 3.41 (100) (16.0.0, 811, 513, 712, 706), 3.01 (60) (015, 11.0.6, 115, 18.0.1), 2.89 (70) (11.1.3, 914), 2.74 (40) (216, 11.1.4, 116, 20.0.0), 2.14 (50) (21.0.6, 119, 19.0.7, 019), 2.04 (45) (16.1.7, 18.1.6, 22.1.3, 4.0.11), 2.01 (80) (020, 23.1.2, 5.0.11, 23.0.6), 1.73 (35) (16.2.0, 10.2.5, 726). Eclarite is whitish-grey (air) and bluish-grey (oil) against galena, respectively; bireflectance is moderate to distinct, anisotropism distinct (air) and strong (oil), respectively. Reflectances in air are (wavelength,R max ,R min ): 480 nm: 51.2–45.2; 546 nm: 47.2–42.9; 589 nm: 46.1–42.0; 644 nm: 45.0–40.2%. Micro indentation hardness VHN50 is 87–191 (av. 163) kp·mm–2.
Mit 3 Abbildungen
Herrn Professor Dr.Josef Zemann zum 60. Geburtstag gewidmet. 相似文献
4.
Conventionally the terrain/topographic reduction is based on the Bouguer Plate, which is flat and extends in the local tangent plane/horizontal plane to infinity. Here we aim at an error estimate of such a planar approximation of the Newton integral of the type of a disturbing potential and gravitational disturbance as linearized forms of the gravitational potential and the modulus of gravitational field intensity. To effect this quality control of the conventional terrain reduction, we first transform the spherical Newton functional from an equatorial frame of reference to an oblique meta-equatorial frame of reference with the evaluation point as a meta-North pole, and then by means of an oblique equiareal map projection of the azimuthal type to a tangent plane which moves at the evaluation point. The first term of these transformed Newton functionals is the planar approximation. The difference between the exact Newton kernels and their planar approximation are plotted and tabulated in Tables 1-3. Three configurations are studied in detail: for points at radius r = 10 km around the evaluation point the systematic error varies from 0.26% for a spherical height difference of the order of H – H* = 5 km, more than 0.80% for a spherical height difference of the order of H – H* = 1 km, and more than 1.60% for a spherical height difference of H – H* = 500 m. In contrast, the systematic error for spherical height difference H – H* = 1 km at a distance of r = 1000 km from the evaluation point increases to 44%. Indeed, the newly derived exact Newton kernels which are of the convolution type and are represented in the tangent space moving with the evaluation point can be preferably used with little extra computational effort. 相似文献
5.
Zarfl C Fleet D Fries E Galgani F Gerdts G Hanke G Matthies M 《Marine pollution bulletin》2011,62(8):1589-1591
6.
Tectonic models are commonly underpinned by metamorphic cooling rates derived from diffusive‐loss thermochronology data. Such cooling ages are usually linked to temperature via Dodson's closure temperature (TC) formulation, which specifies a 1/time‐shaped cooling path (Contributions to Mineralogy and Petrology, 1973, 40, 259). Geologists, however, commonly discuss cooling rates as a linear temperature/time shape. We present the results of a series of simple finite‐difference diffusion models for Ar diffusion in muscovite and biotite that show that the difference in recorded age between 1/t and linear cooling paths increases significantly with hotter starting temperatures, slower cooling rates and smaller grain sizes. Our results show that it is essential to constrain the cooling path shape in order to make meaningful interpretations of the measured data. 相似文献
8.
Dr. Kurt Hanke 《Contributions to Mineralogy and Petrology》1965,11(6):535-558
Zusammenfassung Die Kristallstrukturen von (Mg0,9Fe0,1)2SiO4, Fe2SiO4 und Na2BeF4 wurden mit 2-dimensionalen Fourier-Methoden unter Verwendung von photographisch gesammelten Intensitäten verfeinert. In allen gerechneten Projektionen ergaben sichR-Faktoren unter 0,075.Die interatomaren Abstände in allen drei Strukturen stimmen gut mit den Werten aus anderen vergleichbaren und sorgfältig untersuchten Verbindungen überein. Starke Abweichungen von der idealisierten Struktur (Anordnung der Anionen in einer hexagonalen Dichtestpackung) ergeben sich vor allem durch die Verkürzung gemeinsamer Kanten zwischen Koordinationspolyedern. Diese Verzerrungen wirken sich besonders auf die Koordinationsoktaeder aus; insbesondere zeigt das sechsfach koordinierte Kation auf der Symmetrieebene die Tendenz zu einer einseitigen Umgebung. Im (Mg, Fe)2SiO4 wurden keine Anzeichen einer geordneten Verteilung von Mg und Fe gefunden.Für die Olivin-Spinell-Umwandlung scheint die Tatsache wichtig zu sein, daß in der Olivinstruktur Häufungen von Kationen auftreten.
The crystal structures of (Mg0.9Fe0,1)2SiO4, Fe2SiO4 and Na2BeF4 have been refined with 2-dimensional Fourier-methods, using photographically recorded intensities. For all projections theR-factors are below 0.075.The interatomic distances in all three structures are in good agreement with the values from other well refined comparable compounds. Strong deviations from the idealized structure (anions in a hexagonal close packing) are caused by the contraction of the common edges between coordination polyhedra. These deformations influence especially the coordination octahedra; thus, the cation in sixfold coordination on the mirror plane shows a certain tendency to a one-sided coordination. No dicisive indications for an ordered distribution of Mg and Fe were found in (Mg, Fe)2SiO4.The fect that the olivine structure contains accumulations of cations due to the special linkage of the coordination polyhedra. seems to be of importance for the olivine-spinel transition.相似文献
9.
10.
通过与不动产登记机构各业务部门充分研讨交流,梳理不动产权证书和登记证明从印制、发行到使用这一整个流程需要监测监管的内容,结合广东省现有的省、市、县三级信息平台现状,提出证书(证明)管理模块的建设需求和技术手段,供省级平台建设参考,最终实现证书(证明)全过程监管,实现一个印制流水号的可追溯、易查询、迅统计的数字化管理模式。 相似文献