303 research outputs found
Green innovation for the ecological footprints of tourism in China. Fresh evidence from ARDL approach
This study’s objective is to analyze ecological footprints that exist
among China’s economic growth, energy consumption, carbon dioxide
emissions, and the revenue that is generated from tourism in
other countries. The years 1995 through 2020 are the focus of this
particular research endeavor. The relationship between tourism and
carbon emissions has been discovered by a large number of
researchers; nevertheless, the findings have been inconsistent and
do not give a clear picture of the situation. We can only hope that
the results of the study will improve the existing body of knowledge
on tourism and the quality of the surrounding environment.
Throughout the whole of this investigation, the autoregressive distributed
lagged (ARDL) model was used to explore both long-run
and short-run estimations. A dynamic ordinary least squares (DOLS)
model was used in the study to arrive at long-term estimations that
could be relied upon. Even though money from tourism does not
have a substantial influence on the quality of the environment in
China, growth and increasing energy usage are primary donors to
carbon emissions in the nation. ARDL model’s long-term projections
were shown to be correct by the DOLS approach, which offered this
validation. The results of the research provide fresh insights into the
body of knowledge that has been accumulated on the subject of the
linkage between tourism and the natural environment. Because the
receipts from tourism do not have any significant negative exteriority
toward the environment, energy usage is an important element
of environmental degradation and policymakers should prioritize
the development of the tourism sector over energy-focused manufacturing
activities to maintain the growth of the nation in the upper
quartiles. This is because tourismdoes not have any significant negative
externalities on the environment. Sustainable tourism minimizes
environmental and cultural damage while boosting profits.
Developing the appropriate technology, physical infrastructure, and
human capital requires money, time, and effort
Synergistic effect on co-pyrolysis of capsicum stalks and coal
With the depletion of fossil fuel and the concern about environmental issues, the utilization of biomass resources has attracted increasing worldwide interest. The pyrolysis behavior of capsicum stalks and Baoji coal mixtures was investigated by TG-DSC. Results show that the thermal degradation temperature range of capsicum stalks was 290 to 387°C, while that of Baoji coal was 416 to 586°C. According to the comparison of experimental values and calculation results based on the algebraic sum of the fraction of individual mixture samples, the synergistic effect was significant at temperature ranges of 314 to 369 and 431 to 578°C. The synergistic effect could also be seen from the kinetic studies performed according to the Fried man Method. The rate of mass loss and k in the experiment is higher than the calculated values in the range of 314 to 368°C and that in the experiment is lower than the calculated values in the range of 431 to 578°C. Meanwhile, it was indicated that the pyrolysis process of capsicum stalks, Baoji coal and their mixtures could be described by one, two and four first order reactions, respectively.Keywords: Pyrolysis, capsicum stalks, mixing rate, kinetics, synergistic effec
Transmission of sodium chloride in PDMS membrane during Pervaporation based on polymer relaxation
Polydimethylsiloxane (PDMS) composite membrane is used for treating pharmaceutical wastewater containing NaCl and solvent. In this study, the influence of feed concentrations of NaCl and isobutanol, process temperature and membrane microstructures on salt rejection are evaluated. Microstructures of PDMS membrane before and after separation are characterized by nuclear magnetic resonance (NMR), energy dispersive X-ray spectroscopy (EDS), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Positron annihilation life-time spectroscopy (PALS). The PV results show that NaCl will not spontaneously enter PDMS membrane without isobutanol. However, while NaCl feed concentration is 13 wt%, salt rejection of PDMS membrane drops from 100% to 99.09% with increasing feed concentration of isobutanol (up to 7 wt%). On the contrary, a higher temperature increases salt rejection of PDMS membrane and NaCl permeation through PDMS membrane is not through a vapor permeate process. Due to the relaxation of PDMS polymer chain, when PDMS cross-linking ratio is 0.1, the salt rejection increases from 99.87% to 100% with its thickness increasing from 10 ?m to 17.5 ?m. While the cross-linking ratio rises to 0.2, the salt rejection is 100% with the PDMS layer thickness of 10 ?m. The relationship between relaxation of polymer chains and transport of NaCl in PDMS membrane is an excellent guidance and will be beneficial for the treatment of saline organic wastewater
LDP-IDS: Local Differential Privacy for Infinite Data Streams
Streaming data collection is essential to real-time data analytics in various
IoTs and mobile device-based systems, which, however, may expose end users'
privacy. Local differential privacy (LDP) is a promising solution to
privacy-preserving data collection and analysis. However, existing few LDP
studies over streams are either applicable to finite streams only or suffering
from insufficient protection. This paper investigates this problem by proposing
LDP-IDS, a novel -event LDP paradigm to provide practical privacy guarantee
for infinite streams at users end, and adapting the popular budget division
framework in centralized differential privacy (CDP). By constructing a unified
error analysi for LDP, we first develop two adatpive budget division-based LDP
methods for LDP-IDS that can enhance data utility via leveraging the
non-deterministic sparsity in streams. Beyond that, we further propose a novel
population division framework that can not only avoid the high sensitivity of
LDP noise to budget division but also require significantly less communication.
Based on the framework, we also present two adaptive population division
methods for LDP-IDS with theoretical analysis. We conduct extensive experiments
on synthetic and real-world datasets to evaluate the effectiveness and
efficiency pf our proposed frameworks and methods. Experimental results
demonstrate that, despite the effectiveness of the adaptive budget division
methods, the proposed population division framework and methods can further
achieve much higher effectiveness and efficiency.Comment: accepted to SIGMOD'2
Bis(μ-2-{[2-(1,3-benzothiazol-2-yl)hydrazinylidene]methyl}-6-methoxyphenolato)bis[dinitratodysprosium(III)] methanol disolvate
In the centrosymmetric dinuclear title compound, [Dy2(C15H12N3O2S)2(NO3)4]·2CH3OH, the two DyIII atoms are coordinated by two deprotonated 2-{[2-(1,3-benzothiazol-2-yl)hydrazinylidene]methyl}-6-methoxyphenol ligands and four nitrate ions, all of which are chelating. The crystal packing is stabilized by intermolecular N—H⋯O hydrogen bonds and weak O—H⋯O interactions, forming a two-dimensional network parallel to (010)
Transmissible ST3-IncHI2 Plasmids Are Predominant Carriers of Diverse Complex IS26-Class 1 Integron Arrangements in Multidrug-Resistant Salmonella
Diverse mobile genetic elements (MGEs) including plasmids, insertion sequences, and integrons play an important role in the occurrence and spread of multidrug resistance (MDR) in bacteria. It was found in previous studies that IS26 and class 1 integrons integrated on plasmids to speed the dissemination of antibiotic-resistance genes in Salmonella. It is aimed to figure out the patterns of specific genetic arrangements between IS26 and class 1 integrons located in plasmids in MDR Salmonella in this study. A total of 74 plasmid-harboring Salmonella isolates were screened for the presence of IS26 by PCR amplification, and 39 were IS26-positive. Among them, 37 isolates were resistant to at least one antibiotic. The thirty-seven antibiotic-resistant isolates were further involved in PCR detection of class 1 integrons and variable regions, and all were positive for class 1 integrons. Six IS26-class 1 integron arrangements with IS26 inserted into the upstream or downstream of class 1 integrons were characterized. Eight combinations of these IS26-class 1 integron arrangements were identified among 31 antibiotic-resistant isolates. Multidrug-resistance plasmids of the IncHI2 incompatibility group were dominant, which all belonged to ST3 by plasmid double locus sequence typing. These 21 IncHI2-positive isolates harbored six complex IS26-class 1 integron arrangement patterns. Conjugation assays and Southern blot hybridizations confirmed that conjugative multidrug-resistance IncHI2 plasmids harbored the different complex IS26-class 1 integron arrangements. The conjugation frequency of IncHI2 plasmids transferring alone was 10−5-10−6, reflecting that different complex IS26-class 1 integron arrangement patterns didn't significantly affect conjugation frequency (P > 0.05). These data suggested that class 1 integrons represent the hot spot for IS26 insertion, forming diverse MDR loci. And ST3-IncHI2 was the major plasmid lineage contributing to the horizontal transfer of composite IS26-class 1 integron MDR elements in Salmonella
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