Relationship between built environment,socio-economic factors and carbon emissions from shopping trip in Shenyang City,China     

Jing Li  Kevin Lo  Pingyu Zhang  Meng Guo 《中国地理科学(英文版)》2017,27(5):722-734

Promoting active travel behavior and decreasing transport-related carbon dioxide (CO₂) emissions have become a priority in many Chinese cities experiencing rapid urban sprawl and greater automobile dependence. However, there are few studies that holistically examine the physical and social factors associated with travel CO₂ emissions. Using a survey of 1525 shoppers conducted in Shenyang, China, this study estimated shopping-related travel CO₂ emissions and examined how the built environment and individual socioeconomic characteristics contribute to shopping travel behavior and associated CO₂ emissions. We found that, firstly, private car trips generate nearly eight times more carbon emissions than shopping trips using public transport, on average. Second, there was significant spatial autocorrelation with CO₂ emissions per trip, and the highest carbon emissions were clustered in the inner suburbs and between the first and second circumferential roads. Third, shopping travel CO₂ emissions per trip were negatively correlated with several built environment features including population density, the quantity of public transport stations, road density, and shop density. They were also found to be significantly related to the individual socio-economic characteristics of car ownership, employment status, and education level using a multinomial logistic regression model. These empirical findings have important policy implications, assisting in the development of measures that contribute to the sustainability of urban transportation and meet carbon mitigation targets.  相似文献   

Resonance and Capture of Jupiter Comets     

W. S. Koon  M. W. Lo  J. E. Marsden  S. D. Ross 《Celestial Mechanics and Dynamical Astronomy》2001,81(1-2):27-38

A number of Jupiter family comets such as Otermaand Gehrels 3make a rapid transition from heliocentric orbits outside the orbit of Jupiter to heliocentric orbits inside the orbit of Jupiter and vice versa. During this transition, the comet can be captured temporarily by Jupiter for one to several orbits around Jupiter. The interior heliocentric orbit is typically close to the 3:2 resonance while the exterior heliocentric orbit is near the 2:3 resonance. An important feature of the dynamics of these comets is that during the transition, the orbit passes close to the libration points L ₁and L ₂, two of the equilibrium points for the restricted three-body problem for the Sun-Jupiter system. Studying the libration point invariant manifold structures for L ₁and L ₂is a starting point for understanding the capture and resonance transition of these comets. For example, the recently discovered heteroclinic connection between pairs of unstable periodic orbits (one around the L ₁and the other around L ₂) implies a complicated dynamics for comets in a certain energy range. Furthermore, the stable and unstable invariant manifold tubes associated to libration point periodic orbits, of which the heteroclinic connections are a part, are phase space conduits transporting material to and from Jupiter and between the interior and exterior of Jupiter's orbit.  相似文献   

Dating the exhumation of UHP rocks and associated crustal melting in the Norwegian Caledonides   总被引：2，自引：0，他引：2  

Urs?Sch?rerEmail author  Lo?c?Labrousse 《Contributions to Mineralogy and Petrology》2003,144(6):758-770

U–Pb and Rb–Sr dating was undertaken in combination with P–T estimates to (1) constrain the time of ultrahigh-pressure (UHP) eclogite formation in the Stadlandet UHP province of Norway, (2) date later crustal melting–migmatization of the eclogite country gneisses, and (3) temporally trace post-migmatite cooling and retrogression under amphibolite facies metamorphic conditions. In contrast to earlier U–Pb studies which used accessory minerals from the gneisses, we focused on the direct dating of minerals defining the HP assemblage. For the eclogite, rutile and omphacite fractions were analyzed for U–Pb, and from an adjacent migmatite leucosome titanites and K-feldspar. For Rb–Sr dating, phengite was measured for the eclogite, and biotite for two leucosome layers of the migmatite–eclogite complex. A U–Pb age of 389±7 (2σ) Ma is obtained if the full set of 12 rutile and five omphacite analyses is regressed (MSWD: 16), and 389±2 Ma for those nine data which strictly satisfy isochron conditions (MSWD: 0.78). The 389-Ma age is interpreted to date equilibration and freezing of the eclogite paragenesis at maximum temperatures of 770 °C, reached during decompression to 1.8 GPa. Decompression from 2.8 to 1.8 GPa occurred in the partial melting domain of granitic crust, with the migmatites being dated at 375±6 Ma by titanite and K-feldspar from an eclogite-adjacent granitic leucosome. This titanite age also shows that the U–Pb chronometer in rutile is very robust to high temperatures—it remained a closed system for at least 14 million years, at temperatures in excess to 650 °C. After decompression and migmatization, exhumation is accompanied by rapid cooling to reach the 300 °C isograde by 357± 9 Ma, determined by a biotite isochron for a leucosome in a slightly shallower structural level. In considering that the time of maximum pressure is bracketed by early zircon crystallization during subduction and later omphacite–rutile equilibration in the eclogites, an exhumation rate of 5 mm/year is deduced for initial exhumation, occurring between 394 and 389 Ma. For subsequent cooling from 770 to 600 °C, we obtain a rate of 2.3±1.3 mm/year. First stages of exhumation most likely occurred under an overall compressional regime, whereas Devonian basin formation is associated to detachment movements during 389–375 Ma exhumation. This period of extension is followed by a much younger, decoupled thermal phase at 327±5 Ma, occurring under static conditions within very restricted zones, most likely in association with the circulation of fluid phases along old discontinuities. Initial isotopic signatures of Sr and Pb substantiate Paleo- to Meso-Proterozoic crust formation times of the Stadlandet UHP province precursor lithologies.  相似文献   

Reply     

Aloysius K. Lo 《Boundary-Layer Meteorology》1981,20(1):127-131

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LANDSAT images as a tool in regional analysis: The example of Chu Chiang (Pearl River) Delta in South China     

C.P. Lo 《Geoforum》1977,8(2):79-87

The usefulness of LANDSAT imagery as a tool in regional analysis is examined with reference to the Chu Chiang Delta of South China. The false colour composite image obtained by superimposing scenes of different spectral bands through a multispectral viewer provides an efficient basis for interpretation. As a result, both the structural features and the land use characteristics can be mapped. The utilisation of these data in solving problems of agricultural development on a region-wide basis for the Chu Chiang Delta is discussed, and regional subdivisions are drawn up. It is concluded that the synoptic view afforded by satellite images such as LANDSAT has great practical value to a large country such as China and could well stimulate new interest in regional geography.  相似文献   

DETERMINING AND PRESENTING THE THIRD DIMENSION OF A CITY CENTRE: A PHOTOGRAMMETRIC APPROACH     

C. P. Lo 《The Photogrammetric Record》1970,6(36):625-639

The heights of buildings in the city centre of Glasgow have been measured by photogrammetric methods. A comparison of the heighting accuracy with ground checks obtained by the use of a reducing telemeter indicates the possibilities of achieving accurate results by means of photogrammetric instruments and methods. An attempt to present the third dimension of the city on paper has also been made with the Stereosimplex He and the Perspektomat coupled together to form a drawing system. It is hoped that this approach can be further developed so that it will be of use to town planners, urban geographers and others with an interest in the rapid collection of accurate data about cities.  相似文献   

A PHOTOGRAMMETRIC URBAN INFORMATION SYSTEM USING THE CPl PLOTTER     

C. P. Lo 《The Photogrammetric Record》1981,10(57):311-329

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Strong-motion observation of water-induced earthquakes at Hsinfengkiang reservoir in China     

Hsu Tsung-ho  Lo Hsueh-hai  Ho Tu-hsin  Yang Cheng-jung 《Engineering Geology》1976,10(2-4):315-330

The case history and the research work in regard to the water-induced earthquakes at Hsinfengkiang reservoir, 160 km. northeast of Canton, have been reported elsewhere.^[1] The installation of strong-motion seismograph system at the dam site is a component part of the comprehensive scientific program for studying the water-induced earthquakes at this place. The system was in operation after the occurrence of the main shock (Ms= 6.1) in 1962. Since 1966, a number of accelerograms have been obtained, for the aftershocks, on exposed bedrock in the dam site and at different positions on the dam proper, providing useful data for studying the characteristics and the effects of water-induced earthquakes. This paper, as a supplement to the previous report, gives a presentation of such data with preliminary analysis.  相似文献   

Palaeomagnetic investigation of the suchdol terrace of the river vltava     

Alois Kočí  Vojen Ložek  Zdzislaw Małkowski  Reviewer P. Pagáč 《Studia Geophysica et Geodaetica》1974,18(3):259-265

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Distribution of major and trace elements in La Luna Formation, Southwestern Venezuelan Basin     

S. Lo Mnaco  L. Lpez  H. Rojas  D. Garcia  P. Premovic  H. Briceo 《Organic Geochemistry》2002,33(12):2153

The La Luna Formation (Maraca section), Maracaibo Basin, was studied by means of V and Ni analysis of the bitumen, total organic carbon (TOC), total sulfur (St), major elements (Si, Al, Fe, Mg, Mn, Ca, Ti, Na, K, P), trace elements (V, Ni, Co, Cr, Cu, and Zn), and electron microprobe analysis (EPMA) of the whole rock, and St, major elements (Si, Al, Fe, Mg, Mn, Ca, Ti, Na, K, P), trace elements (V, Ni, Co, Cr, Cu, Zn, Mo, Ba, U, Th) and rare earth elements (La, Ce, Nd, Sn, Eu, Th, Yb, Lu) of the carbonate-free fraction. The results are discussed based on the organic and inorganic association of trace elements and their use as paleoenvironmental indicators of sedimentation. An association between V and organic matter is suggested by means of correlation between V and Ni vs. TOC, the use of EPMA (whole rock) and V and Ni concentrations (carbonate-free fraction), whereas Ni is found in the organic matter and the sulfide phase. Fe is present as massive and framboidal pyrite, whereas Zn precipitates into a separate phase (sphalerite), and Ni, Cu and, in some cases, Zn, can be found as sulfides associated with pyrite. Concentrations of V and Ni (bitumen), TOC, St, V, Ni, Cr, Cu and Zn (whole rock), U, Th, Mo (carbonate-free fraction) are indicative of changes in the dysoxic sedimentation conditions in the chert layers (TOC, St, V, Ni, Cu and low Zn and V/Cr <4) to euxinic anoxic conditions in the argillaceous limestone (TOC, St, V, Ni, Cu and high Zn and V/Cr >4). In the sequence corresponding to the argillaceous limestone, variations in the concentrations of TOC, St, V, Ni, Zn, Cu and Cr (whole rock) can be observed, also suggesting variable sedimentation conditions. The following is proposed: (i) sedimentation intervals under euxinic conditions associated with high contribution and/or preservation of organic matter, allowing a high concentration level of V and Ni in the organic phase and the accumulation of Cu, Zn and Ni (in a smaller proportion) in the sulfide phase; (ii) sedimentation intervals under anoxic conditions and in the presence of relatively lower H₂S, which allowed lower concentrations of V and Ni in the organic phase and higher concentrations of Cu, Zn, and Ni in the sulfide phase. Rare earth elements (REE) concentrations exhibit a marked increase in Ce, Nd, Sm, Eu, Y and Lu for the QM-3 interval, relative to Post-Archean Average Shale (PAAS). REE enrichment in shales has been related to the presence of phosphate minerals such as monazite or apatite. However, these minerals were not detected through XRD or EPMA in the whole rock or in the carbonate-free fraction. The association of REE with organic matter is suggested due to the absence of phosphate minerals, although assessment of these elements require further analysis.  相似文献