40 research outputs found
PGC 38025: A Star-forming Lenticular Galaxy With an Off-nuclear Star-forming Core
Lenticular galaxies (S0s) were considered mainly as passive evolved spirals
due to environmental effects for a long time; however, most S0s in the field
cannot fit into this common scenario. In this work, we study one special case,
SDSS J120237.07+642235.3 (PGC 38025), a star-forming field S0 galaxy with an
off-nuclear blue core. We present optical integral field spectroscopic (IFS)
observation with the 3.5 meter telescope at Calar Alto (CAHA) Observatory, and
high-resolution millimeter observation with the NOrthern Extended Millimeter
Array (NOEMA). We estimated the star formation rate (SFR = 0.446 ) and gaseous metallicity (12 + log(O/H) = 8.42) for PGC 38025, which
follows the star formation main sequence and stellar mass - metallicity
relation. We found that the ionized gas and cold molecular gas in PGC 38025
show the same spatial distribution and kinematics, whilst rotating misaligned
with stellar component. The off-nuclear blue core is locating at the same
redshift as PGC 38025 and its optical spectrum suggest it is \rm H\,{\sc ii}
region. We suggest that the star formation in PGC 38025 is triggered by a
gas-rich minor merger, and the off-nuclear blue core might be a local
star-formation happened during the accretion/merger process.Comment: 16 pages, 13 figures, accepted for publication in Ap
Accelerated structural evolution of galaxies in a starbursting cluster at z=2.51
Structural properties of cluster galaxies during their peak formation epoch,
provide key information on whether and how environment affects
galaxy formation and evolution. Based on deep HST/WFC3 imaging towards the
z=2.51 cluster, J1001, we explore environmental effects on the structure, color
gradients, and stellar populations of a statistical sample of cluster SFGs. We
find that the cluster SFGs are on average smaller than their field
counterparts. This difference is most pronounced at the high-mass end
() with nearly all of them lying below the
mass-size relation of field galaxies. The high-mass cluster SFGs are also
generally old with a steep negative color gradient, indicating an early
formation time likely associated with strong dissipative collapse. For low-mass
cluster SFGs, we unveil a population of compact galaxies with steep positive
color gradients that are not seen in the field. This suggests that the low-mass
compact cluster SFGs may have already experienced strong environmental effects,
e.g., tidal/ram pressure stripping, in this young cluster. These results
provide evidence on the environmental effects at work in the earliest formed
clusters with different roles in the formation of low and high-mass galaxies.Comment: 13 pages, 10 figures, 1 tabl
Site fidelity and range size of wintering Barnacle Geese Branta leucopsis
Barnacle Geese restrict their movements to relatively few key sites and exhibit considerable variation in ranging behaviour. To examine individual and seasonal variation in site fidelity, habitat use, range size and foraging
strategies of Barnacle Geese Branta leucopsis, the movements of 18 male Barnacle Geese tagged in two discrete areas were tracked for 3–6 months from late autumn until departure on the spring migration.
Tagged geese concentrated their feeding in a relatively small proportion of apparently suitable habitat. Geese moved increasingly further afield in midwinter, and there was a clear predeparture shift to the largest area of relatively undisturbed, and possibly more nitrogen-rich, saltmarsh on the Solway. Birds from one of the two capture sites tended to be more sedentary and have smaller home ranges
Noema formIng Cluster survEy (NICE): Discovery of a starbursting galaxy group with a radio-luminous core at z=3.95
The study of distant galaxy groups and clusters at the peak epoch of star
formation is limited by the lack of a statistically and homogeneously selected
and spectroscopically confirmed sample. Recent discoveries of concentrated
starburst activities in cluster cores have opened a new window to hunt for
these structures based on their integrated IR luminosities. Hereby we carry out
the large NOEMA (NOrthern Extended Millimeter Array) program targeting a
statistical sample of infrared-luminous sources associated with overdensities
of massive galaxies at z>2, the Noema formIng Cluster survEy (NICE). We present
the first result from the ongoing NICE survey, a compact group at z=3.95 in the
Lockman Hole field (LH-SBC3), confirmed via four massive (M_star>10^10.5M_sun)
galaxies detected in CO(4-3) and [CI](1-0) lines. The four CO-detected members
of LH-SBC3 are distributed over a 180 kpc physical scale, and the entire
structure has an estimated halo mass of ~10^13Msun and total star formation
rate (SFR) of ~4000Msun/yr. In addition, the most massive galaxy hosts a
radio-loud AGN with L_1.4GHz, rest = 3.0*10^25W/Hz. The discovery of LH-SBC3
demonstrates the feasibility of our method to efficiently identify high-z
compact groups or forming cluster cores. The existence of these starbursting
cluster cores up to z~4 provides critical insights into the mass assembly
history of the central massive galaxies in clusters.Comment: 7 pages, 7 figures, submitted to A&
Flow cytometric immunobead assay for quantitative detection of platelet autoantibodies in immune thrombocytopenia patients
Overviews of internet of things applications in China’s hospitality industry
During the current post-epidemic period, hygiene requirements and health needs in the hospitality industry keep increasing, and consumers become more concerned about the cleanliness of hotels and have stronger demands for contactless services in hotels. The growth and popularity of IoT technology in China make it more accessible to a wider range of service industries and provides the basis for the application of IoT in the hospitality industry. The application of IoT devices in hotels mainly includes intelligent robots, intelligent guest control, systems, etc., which helps to realize contactless services in hotels. This research reviews the entire development cycle of the application of IoT in the hospitality industry, from the founding, development, and expansion of companies to their IPO and post-IPO maturity. From a perspective combined with IoT technology, we can cope with the changing industry models, business models, and operation modes in the hospitality industry more efficiently. The development of IoT in hotels will move towards humanization and service-orientation. Through the role of human–machine linkage and the reasonable management of IoT equipment, IoT technology can reasonably promote the efficiency of manual work, while injecting “warmth” and “quality” into IoT equipment.Published versio
Region-Enhanced Convolutional Neural Network for Object Detection in Remote Sensing Images
Overviews of Internet of Things Applications in China’s Hospitality Industry
During the current post-epidemic period, hygiene requirements and health needs in the hospitality industry keep increasing, and consumers become more concerned about the cleanliness of hotels and have stronger demands for contactless services in hotels. The growth and popularity of IoT technology in China make it more accessible to a wider range of service industries and provides the basis for the application of IoT in the hospitality industry. The application of IoT devices in hotels mainly includes intelligent robots, intelligent guest control, systems, etc., which helps to realize contactless services in hotels. This research reviews the entire development cycle of the application of IoT in the hospitality industry, from the founding, development, and expansion of companies to their IPO and post-IPO maturity. From a perspective combined with IoT technology, we can cope with the changing industry models, business models, and operation modes in the hospitality industry more efficiently. The development of IoT in hotels will move towards humanization and service-orientation. Through the role of human–machine linkage and the reasonable management of IoT equipment, IoT technology can reasonably promote the efficiency of manual work, while injecting “warmth” and “quality” into IoT equipment
TMBPF-induced neurotoxicity and oxidative stress in zebrafish larvae: impacts on central nervous system development and dopamine neurons
Bisphenol A (BPA), a common bisphenol molecule, is well known in the environment as an endocrine disruptor. Furthermore, BPs (BPA, BPS, BPF, and BPAF) have been shown in recent years to be neurotoxic to zebrafish. Tetramethyl bisphenol F (TMBPF) has recently been introduced as a substitute for bisphenol A (BPA) in various industries, including plastics and food contact coatings. However, a growing number of studies have demonstrated that the toxicity of some BPA substitutes is similar to or even stronger than BPA, posing potential harm to human health and the environment. In this study, we used zebrafish larvae as a model to investigate the neurodevelopmental effects of TMBPF at different concentrations (0, 0.25, 0.5, 1, 2, 4 and 8 mg/L). Our results showed that exposure to TMBPF at concentrations higher than 4 mg/L for 72 h post-fertilization (hpf) resulted in zebrafish mortality, whereas exposure to 2 mg/L for 144 hpf caused deformities. Furthermore, TMBPF exposure inhibited the development of the central nervous system, motor nerves, and dopamine neurons in zebrafish. Real-time polymerase chain reaction (PCR) analysis revealed that TMBPF exposure significantly down-regulated the expression of oxidative stress-related genes (Cu/Zn-SOD, Mn-SOD, and CAT) and neurodevelopmental genes (mbp, gafp, and syn2a), while up-regulated the expression of dopamine-related genes (th1, th2, and dat). Notably, treatment with the antioxidant N-acetylcysteine (NAC) alleviated TMBPF-induced toxicity. NAC can regulate the expression of genes related to oxidative stress, neurodevelopment and dopamine development, and make the nerve development of zebrafish normal. Overall, our research suggested that TMBPF may disrupt the development of the early central nervous system and dopamine neurons, leading to abnormal motor behavior in zebrafish larvae. These results highlight the potential risks associated with the use of TMBPF in various industries and the importance to evaluate its potential risks to human health and the environment