664 research outputs found
Editorial: crime patterns in time and space: the dynamics of crime opportunities in urban areas
The routine activity approach and associated crime pattern theory emphasise how crime emerges from spatio-temporal routines. In order to understand this crime should be studied in both space and time. However, the bulk of research into crime patterns and related activities has investigated the spatial distributions of crime, neglecting the temporal dimension. Specifically, disaggregation of crime by place and by time, for example hour of day, day of week, month of year, season, or school day versus none school day, is extremely relevant to theory. Modern data make such spatio-temporal disaggregation increasingly feasible, as exemplified in this special issue. First, much larger data files allow disaggregation of crime data into temporal and spatial slices. Second, new forms of data are generated by modern technologies, allowing innovative and new forms of analyses. Crime pattern analyses and routine activity inquiries are now able to explore avenues not previously available. The unique collection of nine papers in this thematic issue specifically examine spatio-temporal patterns of crime to; demonstrate the value of this approach for advancing knowledge in the field; consider how this informs our theoretical understanding of the manifestations of crime in time and space; to consider the prevention implications of this; and to raise awareness of the need for further spatio-temporal research into crime event
Spatial clustering in the ESO-Sculptor Survey: two-point correlation functions by galaxy type at redshifts 0.1 - 0.5
We calculate the spatial two-point auto and cross-correlation functions for
the 765 galaxies with Rc<21.5 and 0.1<z<0.51 in the ESO-Sculptor survey, and
explore the segregation effects among the populations of giant (early-type,
late spiral) and dwarf (dE, dI) galaxies. At separation of 0.3 h^-1 Mpc, pairs
of early-type galaxies dominate the clustering over all the other types of
pairs. At intermediate scales, 0.3-5 h^-1 Mpc, mixed pairs of dwarf and giant
galaxies contribute equally as pairs of giant galaxies, whereas the latter
dominate at ~10 h^-1 Mpc. We detect the signature of the transition between the
1-halo and 2-halo regimes which is expected in the scenario of galaxy formation
by hierarchical merging of dark matter halos. The early-type galaxies largely
outdo the late spiral galaxies in their 1-halo component, whereas the 2-halo
components of both giant populations are comparable. The dwarf galaxies have an
intermediate 1-halo component between the 2 giant galaxy types, and their
2-halo component is weak and consistent with null clustering. The present
analysis indicates that the early-type galaxies are preferentially located near
the centers of the most massive halos, whereas late spiral galaxies tend to
occupy their outskirts or the centers of less massive halos. This analysis also
unveils new results on the spatial distribution of dwarf galaxies: at the scale
at which they significantly cluster inside the halos (<0.3 h^-1 Mpc), they are
poorly mixed with the late spiral galaxies, and appear preferentially as
satellites of early-type galaxies.Comment: Astronomy & Astrophysics, in press. 29 pages, 15 color figures, 3
table
A NEW SPECIES OF \u3ci\u3eGOLOFA HOPE\u3c/i\u3e, 1837 (COLEOPTERA: SCARABAEIDAE: DYNASTINAE) FROM PERU
A new species of Golofa Hope is described from Peru along with supporting illustrations and a diagnosis.
Se describe una nueva especie de Golofa Hope de Peru soportado por ilustraciones y diagnosis
Intra-week spatial-temporal patterns of crime
Since its original publication, routine activity theory has proven most instructive for understanding temporal patterns in crime. The most prominent of the temporal crime patterns investigated is seasonality: crime (most often assault) increases during the summer months and decreases once routine activities are less often outside. Despite the rather widespread literature on the seasonality of crime, there is very little research investigating temporal patterns of crime at shorter time intervals such as within the week or even within the day. This paper contributes to this literature through a spatial-temporal analysis of crime patterns for different days of the week. It is found that temporal patterns are present for different days of the week (more crime on weekends, as would be expected) and there is a spatial component to that temporal change. Specifically, aside from robbery and sexual assault at the micro-spatial unit of analysis (street segments) the spatial patterns of crime changed. With regard to the spatial pattern changes, we found that assaults and theft from vehicle had their spatial patterns change in predictable ways on Saturdays: assaults increased in the bar district and theft from vehicles increased in the downtown and recreational car park areas
Insect Bronzes of George Foster
The artist’s fabulous bronze insect sculptures, including magnificent scarabs, have been exhibited at the Montréal Insectarium, the Canadian Museum of Nature, the Museum of the University of Nebraska, and many art galleries. Others are in permanent exhibition at the Insectarium of Hong Kong and elsewhere in Asia. George Foster appeared in the episode “Living Art” of the Insectia TV series in 1999. Some sculptures are part of the personal collection of Stéphane Le Tirant, Brett C. Ratcliffe, and the late Henry F. Howden and Roger-Paul Dechambre. We want to acquaint the readers of Scarabs about this artist
Georges Brossard, an Advocate for Insects
People are strange. They’ve built botanical gardens for plants, planetariums for understanding the planets, zoos for large animals, aviaries for birds, and aquariums for fish, but nothing for insects! It’s as though this class of animals doesn’t count. And yet, of all the creatures on Earth, insects are some of the most important. They are food sources, garbage collectors, decomposers, producers, controllers and pollinators. And what do people do for them in return? We hunt them down with insecticides, pesticides, fungicides and herbicides. It’s time to reconcile humans with insects, a very classy class. I’m going to build a temple to honour insects, and I’m going to call it the Insectarium.
— Georges Brossard, 197
Description of a new species of Stenocrates Burmeister (Coleoptera: Scarabaeidae: Dynastinae: Cyclocephalini) from Peru and a revised catalog of the species of Stenocrates.
A new species of the South American genus Stenocrates Burmeister, 1847 (Coleoptera: Scarabaeidae: Dynastinae: Cyclocephalini) is described: Stenocrates theryi Ratcliffe & Le Tirant from western Peru. A description, diagnosis, distribution, and illustrations are provided for the new species. A revised catalog of the species of Stenocrates is presented
Chiral Quark Model with Configuration Mixing
The implications of one gluon exchange generated configuration mixing in the
Chiral Quark Model (QM) with SU(3) and axial U(1) symmetry
breakings are discussed in the context of proton flavor and spin structure as
well as the hyperon -decay parameters. We find that QM
with SU(3) symmetry breaking is able to give a satisfactory unified fit for
spin and quark distribution functions, with the symmetry breaking parameters
, and the mixing angle , both for NMC and the
most recent E866 data. In particular, the agreement with data, in the case of
, F, D, and , is quite striking.Comment: 16 pages, LaTex, Table and Appendix adde
The Clustering of Colour Selected Galaxies
We present measurements of the angular correlation function of galaxies
selected from a B_J=23.5 multicolour survey of two 5 degree by 5 degree fields
located at high galactic latitudes. The galaxy catalogue of approximately
400,000 galaxies is comparable in size to catalogues used to determine the
galaxy correlation function at low-redshift. Measurements of the z=0.4
correlation function at large angular scales show no evidence for a break from
a power law though our results are not inconsistent with a break at >15 Mpc.
Despite the large fields-of-view, there are large discrepancies between the
measurements of the correlation function in each field, possibly due to dwarf
galaxies within z=0.11 clusters near the South Galactic Pole.
Colour selection is used to study the clustering of galaxies z=0 to z=0.4.
The galaxy correlation function is found to strongly depend on colour with red
galaxies more strongly clustered than blue galaxies by a factor of 5 at small
scales. The slope of the correlation function is also found to vary with colour
with gamma=1.8 for red galaxies while gamma=1.5 for blue galaxies. The
clustering of red galaxies is consistently strong over the entire magnitude
range studied though there are large variations between the two fields. The
clustering of blue galaxies is extremely weak over the observed magnitude range
with clustering consistent with r_0=2 Mpc. This is weaker than the clustering
of late-type galaxies in the local Universe and suggests galaxy clustering is
more strongly correlated with colour than morphology. This may also be the
first detection of a substantial low redshift galaxy population with clustering
properties similar to faint blue galaxies.Comment: Accepted for publication in MNRAS. 13 pages, 20 figure
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