527 research outputs found
Rural Labor Absorption Efficiency in Urban Areas under Different Urbanization Patterns and Industrial Structures: The Case of China
In this paper, we use Data Envelopment Analysis (DEA) to estimate how well China’s urban areas absorb migrant workers under the interaction of urbanization and industrialization. We applied an output-oriented BCC model to evaluate provincial and regional rural labor absorption efficiency in mainland China. It appears that 4 out of 31 provinces and municipals are efficient, and 2 out of 8 economic regions are efficient in absorbing migrant workers. In the southern and eastern parts of China, urban labor absorption efficiency is higher compared with the western and northern parts of China. Different urbanization patterns and industrial development strategies should be adopted in different economic areas to enhance labor absorption ability in these areas. Urban areas in many parts of China still have potential to accommodate rural migrant workers. The inter-regional flow of production factors would affect urban labor absorption efficiency.rural labor absorption in urban areas, urbanization, industry structure, DEA
Universal scaling of strange particle spectra in pp collisions
As a complementary study to that performed on the transverse momentum
() spectra of charged pions, kaons and protons in proton-proton (pp)
collisions at LHC energies 0.9, 2.76 and 7 TeV, we present a scaling behaviour
in the spectra of strange particles (, ,
and ) at these three energies. This scaling behaviour is
exhibited when the spectra are expressed in a suitable scaling variable
, where the scaling parameter is determined by the quality
factor method and increases with the center of mass energy (). The
rates at which increases with for these strange
particles are found to be identical within errors. In the framework of the
colour string percolation model, we argue that these strange particles are
produced through the decay of clusters that are formed by the colour strings
overlapping. We observe that the strange mesons and baryons are produced from
clusters with different size distributions, while the strange mesons (baryons)
and ( and ) originate from clusters
with the same size distributions. The cluster's size distributions for strange
mesons are more dispersed than those for strange baryons. The scaling behaviour
of the spectra for these strange particles can be explained by the
colour string percolation model in a quantitative way.Comment: 8 pages, 10 figures, accepted by EPJ
Triple condensate halo from water droplets impacting on cold surfaces
Understanding the dynamics in the deposition of water droplets onto solid
surfaces is of importance from both fundamental and practical viewpoints. While
the deposition of a water droplet onto a heated surface is extensively studied,
the characteristics of depositing a droplet onto a cold surface and the
phenomena leading to such behavior remain elusive. Here we report the formation
of a triple condensate halo observed during the deposition of a water droplet
onto a cold surface, due to the interplay between droplet impact dynamics and
vapor diffusion. Two subsequent condensation stages occur during the droplet
spreading and cooling processes, engendering this unique condensate halo with
three distinctive bands. We further proposed a scaling model to interpret the
size of each band, and the model is validated by the experiments of droplets
with different impact velocity and varying substrate temperature. Our
experimental and theoretical investigation of the droplet impact dynamics and
the associated condensation unravels the mass and heat transfer among droplet,
vapor and substrate, offer a new sight for designing of heat exchange devices
Effect of the combination of percutaneous transluminal angioplasty and pharmacological thrombolysis on hemodialysis patients
Purpose: To examine the efficacy of percutaneous transluminal angioplasty (PTA), combined withpharmacologic thrombolysis (PT) on thrombosis of autologous arteriovenous fistulas (AVFs),inflammatory factors, and β2 microglobulin (β2-MG) levels in hemodialysis patients.Methods: Seventy-eight patients with AVF thrombosis allocated randomly into a control group (CG) received PTA, and a study group (SG) received PTA combined with PT (n = 39 in each). The patency, vascular condition, inflammatory factors, viz, interleukin-6 (IL-6), high-sensitivity C-reactive protein (hs-CRP)), β2-MG levels, vascular-related factors (VEGF-A and MCP-1), complications, and quality of life were determined.Results: At three and six months after surgery, t SG exhibited a higher vascular patency than CG (p <0.05). Serum levels of IL-6, hs-CRP, β2-MG, VEGF-A, and MCP-1 of t SG were lower than those of CG(p < 0.05). The SG showed higher cross-sectional area, inner diameter at the site of fistula, and better quality of life scores than CG (p < 0.05).Conclusion: The combination of PTA and PT enhances efficacy, increases vascular patency, reduces inflammatory response, lowers the level of β2-MG, and improves quality of life in patients with AVFs without increasing complications. Thus, the combination treatment has potentials for the management of hemodialysis patients
Spatiotemporal assessment of PM<sub>2.5</sub>-related economic losses from health impacts during 2014–2016 in China
Background: Particulate air pollution, especially PM2.5, is highly correlated with various adverse health impacts and, ultimately, economic losses for society, however, few studies have undertaken a spatiotemporal assessment of PM2.5-related economic losses from health impacts covering all of the main cities in China. Methods: PM2.5 concentration data were retrieved for 190 Chinese cities for the period 2014–2016. We used a log-linear exposure–response model and monetary valuation methods, such as value of a statistical life (VSL), amended human capital (AHC), and cost of illness to evaluate PM2.5-related economic losses from health impacts at the city level. In addition, Monte Carlo simulation was used to analyze uncertainty. Results: The average economic loss was 0.3% (AHC) to 1% (VSL) of the total gross domestic product (GDP) of 190 Chinese cities from 2014 to 2016. Overall, China experienced a downward trend in total economic losses over the three-year period, but the Beijing–Tianjin–Hebei, Shandong Peninsula, Yangtze River Delta, and Chengdu-Chongqing regions experienced greater annual economic losses. Conclusions: Exploration of spatiotemporal variations in PM2.5-related economic losses from long-term health impacts could provide new information for policymakers regarding priority areas for PM2.5 pollution prevention and control in China
Structural Basis of Ligand Interaction with Atypical Chemokine Receptor 3
Chemokines drive cell migration through their interactions with seven-transmembrane (7TM) chemokine receptors on cell surfaces. The atypical chemokine receptor 3 (ACKR3) binds chemokines CXCL11 and CXCL12 and signals exclusively through β-arrestin-mediated pathways, without activating canonical G-protein signalling. This receptor is upregulated in numerous cancers making it a potential drug target. Here we collected over 100 distinct structural probes from radiolytic footprinting, disulfide trapping, and mutagenesis to map the structures of ACKR3:CXCL12 and ACKR3:small-molecule complexes, including dynamic regions that proved unresolvable by X-ray crystallography in homologous receptors. The data are integrated with molecular modelling to produce complete and cohesive experimentally driven models that confirm and expand on the existing knowledge of the architecture of receptor:chemokine and receptor:small-molecule complexes. Additionally, we detected and characterized ligand-induced conformational changes in the transmembrane and intracellular regions of ACKR3 that elucidate fundamental structural elements of agonism in this atypical receptor
Research on institutional contradiction and legitimacy crisis of internet car-hailing platform with the Grounded Theory
Based on the case of DiDi travel platform event, we used the grounded theory to analyze the legitimacy crisis occurrence mechanism of internet car-hailing platforms organizational field. We found that, the institutional contradiction between public welfare logic and profit logic in the process of DiDi’s Institutional Entrepreneurship leads to the legitimacy crisis; the crisis event causes the government\u27s supervision, media attention and consumer resistance, which ultimately leads to the deterioration and spillover of legitimacy crisis from DiDi to the whole internet car-hailing platforms organizational field
Energy Efficient Indirect Evaporative Air Cooling
An energy-saving and environmentally friendly air-conditioning method has been proposed. The key component is a novel indirect evaporative heat exchanger (IEHX) based on the M-cycle. In this design, the compact IEHX is able to produce sub-wet-bulb cooling and reduce the air temperature approaching dew-point temperature. This chapter aims to achieve a fundamental understanding of the novel IEHX. A numerical model has been developed and validated by comparing the simulated outlet air conditions against experimental data. The model showed a good agreement with the experimental findings. Employing the validated numerical model, we have theoretically investigated the heat and mass transfer behavior occurred in the IEHX. The detailed cooling process has been analyzed on the psychrometric chart. In addition, the effects of varying inlet conditions and airflow passage dimensions on the cooling efficiency have been studied. By analyzing the thermal performance of the IEHX, we have provided possible suggestions to improve the performance of the dew-point cooler and enable it to attain higher cooling effectiveness
- …