1,354 research outputs found
Технология транспортировки высокопарафинистых нефтей с применением депрессорных присадок
Объектом исследования являются технологии транспортировки высокопарафинстой нефти. Цель работы – анализ различных технологических решений, позволяющих улучшить перекачку высокопарафинистых нефтей. В процессе исследования рассматривались различные способы перекачки высокопарафинистых нефтей путем улучшения реологических характеристик; приведена технология, способы, параметры обработки высокопарафинистых нефтей депрессорными присадками. В результате исследования были определены положительные и отрицательные стороны различных технологий транспортировки высокопарафинистых нефтей, проанализирована технология обработки нефти депрессорной присадки, параметры обработки.The object of the research is the technology of transportation of high-paraffin oil. The purpose of the work is to analyze various technological solutions that allow improving the transmission of highly paraffinic oils. In the process of investigation, various ways of transmission highly paraffinic oils by improving rheological characteristics were considered; the technology, methods, parameters of treatment of highly paraffinic oils with depressant additives are given. As a result of the work, the positive and negative aspects of various technologies for transporting highly paraffinic oils were determined, the technology of oil treatment of the depressant additive, processing parameters were analyzed
Интеллектуальные энергосистемы. Т. 1
Настоящий сборник содержит материалы V Международного молодежного форума "Интеллектуальные энергосистемы", проведенного 9 - 13 октября 2017г. на базе Энергетического института Томского политехнического университета
Разработка технологии ручной дуговой и механизированной под слоем флюса сварки нахлесточных соединений пластин
В выпускной квалификационной работе разработана технология ручной дуговой и механизированной сварки под слоем флюса нахлёсточных соединений пластин из стали 10Г2С1Д, предложено устройство для сварки. Произведены расчеты режимов сварки.
В экономической части ВКР выполнен расчет экономического эффекта от внедрения новой технологии. Рассмотрены вопросы безопасности труда производственных рабочих и охраны окружающей среды. Выпускная квалификационная работа бакалавра выполнена в текстовом редакторе Microsoft Word 2016In final qualifying wok the technology of manual arc and mechanized welding under a layer of flux of lap joints of plates from steel 10G2C1D, is developed, the device for welding is suggested.
Calculations of welding modes are dene. In economic pat of final qualifying work, the calculation of the economic effect from the introduction of new technology is fulfilled. Issues of labor safety of industrial warblers and environmental protection are considered. The final qualifying work is done in a text editor Microsoft word 2016
Large-Amplitude Ultraviolet Variations in the RR Lyrae Star ROTSE-I J143753.84+345924.8
The NASA Galaxy Evolution Explorer (GALEX) satellite has obtained
simultaneous near and far ultraviolet light curves of the ROTSE-I Catalog RR
Lyrae ab-type variable star J143753.84+345924.8. A series of 38 GALEX Deep
Imaging Survey observations well distributed in phase within the star's
0.56432d period shows an AB=4.9mag variation in the far UV (1350-1750A) band
and an AB=1.8mag variation in the near UV (1750-2750A) band, compared with only
a 0.8mag variation in the broad, unfiltered ROTSE-I (4500-10000A) band. These
GALEX UV observations are the first to reveal a large RR Lyrae amplitude
variation at wavelengths below 1800A. We compare the GALEX and ROTSE-I
observations to predictions made by recent Kurucz stellar atmosphere models. We
use published physical parameters for the comparable period (0.57433d),
well-observed RR Lyrae star WY Antliae to compute predicted FUV, NUV, and
ROTSE-I light curves for J143753.84+345924.8. The observed light curves agree
with the Kurucz predictions for [Fe/H]=-1.25 to within AB=0.2mag in the GALEX
NUV and ROTSE-I bands, and within 0.5mag in the FUV. At all metallicities
between solar and one hundredth solar, the Kurucz models predict 6-8mag of
variation at wavelengths between 1000-1700A. Other variable stars with similar
temperature variations, such as Cepheids, should also have large-amplitude FUV
light curves, observable during the ongoing GALEX imaging surveys.Comment: This paper will be published as part of the Galaxy Evolution Explorer
(GALEX) Astrophysical Journal Letters Special Issue. Links to the full set of
papers will be available at http:/www.galex.caltech.edu/PUBLICATIONS after
November 22, 200
The GALEX UV luminosity function of the cluster of galaxies Abell 1367
We present the GALEX NUV (2310 A) and FUV (1530 A) galaxy luminosity
functions of the nearby cluster of galaxies A1367 in the magnitude range -20.3<
M_AB < -13.3. The luminosity functions are consistent with previous (~ 2 mag
shallower) estimates based on the FOCA and FAUST experiments, but display a
steeper faint-end slope than the GALEX luminosity function for local field
galaxies. Using spectro-photometric optical data we select out star-forming
systems from quiescent galaxies and study their separate contributions to the
cluster luminosity function. We find that the UV luminosity function of cluster
star-forming galaxies is consistent with the field. The difference between the
cluster and field LF is entirely due to the contribution at low luminosities
(M_AB >-16 mag) of non star-forming, early-type galaxies that are significantly
over dense in clusters.Comment: 4 pages, 4 figures, 1 table. Accepted for publication in
Astrophysical Journal Letter
GALEX UV Spectroscopy and Deep Imaging of LIRGs in the ELAIS S1 field
The ELAIS S1 field was observed by GALEX in both its Wide Spectroscopic and
Deep Imaging Survey modes. This field was previously observed by the Infrared
Space Observatory and we made use of the catalogue of multi-wavelength data
published by the ELAIS consortium to select galaxies common to the two samples.
Among the 959 objects with GALEX spectroscopy, 88 are present in the ELAIS
catalog and 19 are galaxies with an optical spectroscopic redshift. The
distribution of redshifts covers the range . The selected galaxies
have bolometric IR luminosities (deduced from the flux using ISOCAM) which means that we cover a wide range of galaxies from
normal to Ultra Luminous IR Galaxies. The mean () UV luminosity (not
corrected for extinction) amounts to
L_\sun for the low-z () sample. The UV slope (assuming
) correlates with the GALEX FUV-NUV color if
the sample is restricted to galaxies below . Taking advantage of the
UV and IR data, we estimate the dust attenuation from the IR/UV ratio and
compare it to the UV slope . We find that it is not possible to uniquely
estimate the dust attenuation from for our sample of galaxies. These
galaxies are highly extinguished with a median value .
Once the dust correction applied, the UV- and IR-based SFRs correlate. For the
closest galaxy with the best quality spectrum, we see a feature consistent with
being produced by a bump near 220nm in the attenuation curve.Comment: This paper has been published as part of the GALEX ApJL Special Issue
(ApJ 619, L63
The GALEX-VVDS Measurement of the Evolution of the 1500A Luminosity Function
We present the first measurement of the galaxy luminosity function at 1500A
between 0.2<z<1.2 based on GALEX-VVDS observations (1000 spectroscopic
redshifts for galaxies with NUV<24.5) and at higher z using existing datasets.
Our main results are summarized as follows :
(i) luminosity evolution is observed with Delta(Mstar)=-2.0 mag between z=0
and z=1 and Delta(Mstar)=-1.0mag between z=1 and z=3. This confirms that the
star formation activity was significantly higher in the past.
(ii) the LF slopes vary between -1.2< alpha <-1.65, with a marginally
significant hint of increase at higher z.
(iii) we split the sample in three restframe (B-I) intervals providing an
approximate spectral type classification: Sb-Sd, Sd-Irr and unobscured
starbursts. We find that the bluest class evolves less strongly in luminosity
than the two other classes. On the other hand their number density increases
sharply with z (15% in the local universe to 55% at z=1) while that of the
reddest classes decreases.Comment: 4 pages, 4 figures. This paper will be published as part of the
Galaxy Evolution Explorer (GALEX) Astrophysical Journal Letters Special
Issue.Links to the full set of papers will be available at :
http://www.galex.caltech.edu/PUBLICATIONS/ after November 22, 200
GALEX UV Color-Magnitude Relations and Evidence for Recent Star Formation in Early-type Galaxies
We have used the GALEX UV photometric data to construct a first
near-ultraviolet (NUV) color-magnitude relation (CMR) for the galaxies
pre-classified as early-type by SDSS studies. The NUV CMR is a powerful tool
for tracking the recent star formation history in early-type galaxies, owing to
its high sensitivity to the presence of young stellar populations. Our NUV CMR
for UV-weak galaxies shows a well-defined slope and thus will be useful for
interpreting the restframe NUV data of distant galaxies and studying their star
formation history. Compared to optical CMRs, the NUV CMR shows a substantially
larger scatter, which we interpret as evidence of recent star formation
activities. Roughly 15% of the recent epoch (z < 0.13) bright (M[r] < -22)
early-type galaxies show a sign of recent (< 1Gyr) star formation at the 1-2%
level (lower limit) in mass compared to the total stellar mass. This implies
that low level residual star formation was common during the last few billion
years even in bright early-type galaxies.Comment: This paper will be published as part of the Galaxy Evolution Explorer
(GALEX) Astrophysical Journal Letters Special Issue. Links to the full set of
papers will be available at http://www.galex.caltech.edu/PUBLICATIONS/ after
November 22, 200
A systematic review of methods used to study fish in saltmarsh flats
There is a growing body of research highlighting the importance of saltmarshes as habitats for fish for feeding, refuge from predation and reproduction. However, more work is needed on fish on vegetated marsh flats (or surfaces). We reviewed 60 studies that used 21 methods to sample fish assemblages on saltmarsh flats. Drop samplers, fyke nets and pop nets were most frequently employed, with considerably more studies being conducted in graminoid than succulent marsh. Reporting of sampling temporal and tidal details, environmental variables and fish attributes was inconsistent. Most of the papers focussed on one or more of conservation management, comparisons among habitat types, and the use of saltmarsh (including fish activity type or residency status). Important potential areas of research include the relationships between the fish assemblages of saltmarsh flats and coastal fisheries, the effects of invasive plant species and marsh restoration efforts in areas outside the United States, and the potential effects of sea-level rise on vegetated flats as fish habitat. Sampling methods that provide density measures are likely to be most useful for most of this research. Thus, drop samplers and pop nets are an appropriate choice, the former in graminoid saltmarshes and the latter in succulent saltmarshes
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