Wyniki wyszukiwania - Biblioteka Nauki

1

Environmental protection tax effect on reducing PM2.5 pollution in China and its influencing factors

100%

Han F. , Li J.

Polish Journal of Environmental Studies

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2021

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tom 30

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nr 1

2

Estimating the number of components in an OSL decay curve using the Bayesian Information Criterion

70%

Peng J. , Dong Z. , Han F. , Han Y. , Dai X.

Geochronometria

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2014

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tom Vol. 41, no. 4

334--341

EN

The optically stimulated luminescence (OSL) decay curve is assumed to consist of a number of first-order exponential components. Improper estimation of the number of components leads to under-or over-fitting of the curve under consideration. Hence, correct estimation of the number of components is important to accurately analyze an OSL decay curve. In this study, we investigated the possibility of using the Bayesian Information Criterion to estimate the optimal number of components in an OSL decay curve. We tested the reliability of this method using several hundred measured decay curves and three simulation scenarios. Our results demonstrate that the quality of the identification can be influenced by several factors: the measurement time and the number of channels; the variability of the decay constants; and the signal-to-noise ratios of a decaying component. The results also suggest that the Bayesian Information Criterion has great potential to estimate the number of components in an OSL decay curve with a moderate to high signal-to-noise ratio.

3

Surface Deformation due to Loading of a Layered Elastic Half-space : Constructing the Solution for a General Polygonal Load

70%

Bevis M. , Pan E. , Zhou H. , Han F. , Zhu R.

Acta Geophysica

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2015

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tom Vol. 63, no. 4

957--977

EN

We describe an algorithm for rapidly computing the surface displacements induced by a general polygonal load on a layered, isotropic, elastic half-space. The arbitrary surface pressure field is discretized using a large number, n, of equally-sized circular loading elements. The problem is to compute the displacement at a large number, m, of points (or stations) distributed over the surface. The essence of our technique is to reorganize all but a computationally insignificant part of this calculation into an equivalent problem: compute the displacements due to a single circular loading element at a total of m n stations (where m n is the product m × n). We solve this “parallel” problem at high computational speed by utilizing the sparse evaluation and massive interpolation (SEMI) method. Because the product m n that arises in our parallel problem is normally very large, we take maximum possible advantage of the acceleration achieved by the SEMI algorithm.

4

Volatile and semi-volatile organic compounds in the lower yangtze river and surface waters of three Chinese provinces

70%

Han F. , Chen J. , Jiang Z. , Chen L. , Ji W.

Polish Journal of Environmental Studies

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2013

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tom 22

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nr 3

EN

Water samples were collected from the drinking water source of 21 urban areas from the lower Yangtze River at Jiangsu province and various surface drinking water sources of Jiangsu, Zhejiang, and Shandong provinces of China. They were tested for 25 VOCs and 38 SVOCs using purge and trap (P&T) and gas chromatography – mass spectrometry (GC-MS). The results show there were 19 VOCs and 10 SVOCs detected several times in at least one drinking water source. One hundred and twenty-six samples from 21 sampling sites were found to have organic compound pollutants in the range of less than MDL to 27.79 μg/L, including volatile chlorinated hydrocarbons, BTEX, chlorinated benzenes, phenols, nitrobenzene, phthalate esters, pesticides, et al. – in total 21 types of organic compounds considered to be priority water pollutants by the Chinese Department of Water Resources. However, the concentrations of VOCs and SVOCs in samples from the lower Yangtze River were markedly different from those in surface drinking water sources in Jiangsu, Zhejiang, and Shandong provinces. PAEs were detected in all water samples, but PCP and Rogor were only detected in samples from the lower Yangtze River. It should be noted that the majority of water samples with detected atrazine were from Jiangsu and Shandong provinces. The main SVOCs detected in the Yangtze River included PCP, Rogor, nitrobenzene, and PAEs. More pollutants were detected in the surface waters of Jiangsu than those of Zhejiang and Shandong. Among the surface water sources in Zhejiang, there were more species of VOCs and SVOCs in the Shanhusha Reservoir than the other reservoirs, which may have resulted from pollutants in Qiantang River water. Though the types and levels of water pollutants varied from one region to another in Jiangsu, Zhejiang, and Shandong provinces, our report added new evidence that the Yangtze River and other urban surface water sources have been universally polluted, and we recommend that all potential sources should be traced and mediated. In addition, because these persistent pollutants may be a health risk if transferred to drinking water, drinking water quality must be controlled specifically for certain VOC's and installation of a monitoring program/quality control for drinking water resources is needed.

5

Assessing landscape ecological risk for a world natural heritage site: a case study of Bayanbulak in China

70%

Shi H. , Yang Z. , Han F. , Shi T. , Li D.

Polish Journal of Environmental Studies

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2015

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tom 24

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nr 1

EN

Wetland protection, floral and faunal resource management, and habitat migration are all concerns for the ecological risk of wetland landscapes. Indices of landscape-scale ecological risks have the potential to influence changes in landscape patterns, the conditions of endangered plants and animals, and influences from nature and humans. Semi-variation function and gravity center models were used to quantify risk area changes. The changes of landscape ecological risk were analyzed for Bayanbulak Wetland from 2000 to 2010. In addition to landscape and species distribution data, GIS technology and remote sensing were used in this study. Results show that landscape structure changed over the 10-year period, with high-cover grassland area decreasing the most. Landscape pattern index types also changed for the study area. The number of landscapetype patches to low-cover grassland decreased, the landscape fragmentation index of dry land and high-cover grassland was reduced, and the interference degree of middle-cover grassland increased over the study period. The index of landscape ecological risk decreased from 2000 to 2010, with the spatial structure changing from a single center concentration to a multi-center distribution. All varying ecological risk regions of gravity centers moved from the northeast to the southwest. The gravity migration of the Level 2 region moved the furthest. Additionally, evidence suggests that various threatening factors reduce the ecological function and systems of wetlands. These include climate change, biological invasion, human activities, and water pollution. This paper assesses the heritage site landscape ecological risk and calculates the gravity center change of the region, which can be formulated to enrich and develop the research of small- and medium-sized wetlands in cold, semi-arid climates.

6

ESR dose response of the Al center measured in quartz samples from the Yellow River (China): Implications for the dating of Upper Pleistocene sediment

61%

Voinchet P. , Yin G. , Falguères C. , Liu C. , Han F. , Sun X. , Bahain J. J.

Geochronometria

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2013

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tom Vol. 40, no. 4

341--347

EN

The ESR dating method requires to describe the evolution of the ESR signal intensities vs. increasing gamma doses, then to extrapolate the equivalent dose of radiation received by the sample since its deposition using mathematical fitting. The function classically used to describe the growth curves of ESR aluminium signal in quartz was recently discussed and challenged for Lower Pleisto-cene sediments. In the present work, some alluvial sediments sampled in Upper Pleistocene fluvial terraces of the Yellow River system (China) permit us to test the application of another extrapolation function (linear + exponential) recently proposed for Lower Pleistocene sediments. The equivalent doses obtained here for the recent deposits of the Yellow River system and the corresponding ages are promising and indicate the potential of ESR to date quartz deposits from Upper Pleistocene times.

7

ESR geochronology of the Minjiang River terraces at Wenchuan, eastern margin of Tibetan Plateau, China

51%

Liu C.-R. , Yin G.-M. , Zhang H.-P. , Zheng W.-J. , Voinchet P. , Han F. , Wang D. , Song W.-J. , Bahain J.-J.

Geochronometria

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2013

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tom Vol. 40, no. 4

360--367

EN

The Minjiang River terrace along the Longmen Shan fault zone near Wenchuan, at the eastern margin of the Tibetan Plateau, China, provides archives for tectonic activity and quaternary climate change. However, previous studies were not able to provide ages older than 100 ka due to the limitations of dating material or/and methods applied to date the fluvial sediments. In this study, we used the ESR signal of the Ti-Li center in quartz to obtain the ages of four higher terraces (T3-T6). According to the results, the terraces T3 to T6 were formed at 64±19 ka, 101±15 ka, 153±33 ka, and 423±115 ka, respectively. Combined with previous studies, these results indicate that the formations of all terraces correspond to glacial/interglacial transition periods, such as, T1-T5 being correlated to MIS2/1, MIS4/3, MIS5d/5c, and MIS6/5e respectively, while T6 probably to MIS12/11. According to these data, it is found that the average incision rate was significantly higher over the last 150 ka than that previous 100 ka (250 to 150 ka). As both tectonics and climate have affected the formation of these terraces, in addition to the overall uplifting of Tibetan Plateau, the regional uplift due to isostasy would be an additional tectonic factor in the formation of river terraces in the eastern margin of Ti-betan plateau.

8

RhoA/Rock2/Limk1/cofilin1 pathway is involved in attenuation of neuronal dendritic spine loss by paeonol in the frontal cortex of D‑galactose and aluminum‑induced Alzheimer’s disease‑like rat model

51%

Han F. , Xu H. , Shen J.-X. , Pan C. , Yu Z.-H. , Chen J.-J. , Zhu X. L. , Cai Y.-F. , Lu Y.-P.

Acta Neurobiologiae Experimentalis

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2020

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tom 80

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nr 3

EN

Alzheimer’s disease (AD) has become the most prevalent neurodegenerative disorder. Given the pathogenesis of AD is unclear, there is currently no drug approved to halt or delay the progression of AD. Therefore, it is pressing to explore new targets and drugs for AD. In China, polyphenolic Chinese herbal medicine has been used for thousands of years in clinical application, and no toxic effects have been reported. In the present study, using D‑galactose and aluminum‑induced rat model, the effects of paeonol on AD were validated via the Morris water maze test, open field test, and elevated plus maze test. Neuronal morphology in frontal cortex was assessed using ImageJ’s Sholl plugin and RESCONSTRUCT software. RhoA/Rock2/Limk1/cofilin1 signaling pathway‑related molecules were determined by Western blotting. Cofilin1 and p‑cofilin1 were analyzed by immunofluorescence. Results showed that pre‑treatment with paeonol attenuated D‑galactose and aluminum‑induced behavioral dysfunction and AD‑like pathological alterations in the frontal cortex. Accompanied by these changes were the alterations in the dendrite and dendritic spine densities, especially the mushroom‑type and filopodia‑type spines in the apical dendrites, as well as actin filaments. In addition, the activity and intracellular distribution of cofilin1 and the molecules RhoA/Rock2/Limk1 that regulate the signaling pathway for cofilin1 phosphorylation have also changed. Our data suggests that paeonol may be through reducing Aβ levels to alleviate the loss of fibrillar actin and dendrites and dendritic spines via the Rho/Rock2/Limk1/cofilin1 signaling pathway in the frontal cortex, and ultimately improving AD‑like behavior.

9

Stabilization/solidification treatment of cadmium-bearing-residue with magnesium slag

51%

Chen Y. , Han F. , Liang Y. , Peng N. , Peng B. , Liu H. , Wang Z. , Zhao Z.

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nr 1

10

ESR dating of the Donggutuo Palaeolithic site in the Nihewan Basin, northern China

51%

Liu C.-R. , Yin G.-M. , Fang F. , Voinchet P. , Deng C.-L. , Han F. , Li J.-P. , Song W.-J. , Wang D. , Bahain J.-J.

Geochronometria

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2013

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tom Vol. 40, no. 4

348--354

EN

The fluvio-lacustrine sequences in the Nihewan Basin, northern China, provide important terrestrial archives about Palaeolithic settlements and, therefore, about early human occupation in high northern latitude in East Asia. Here we present detailed ESR dating of the Donggutuo Palaeo-lithic site, located in this basin. Four levels A, B, C and E of the Donggutuo archaeological layer yield ESR ages ranging from 1060±129 ka to 1171±132 ka with a mean of 1119±132 ka. The ages are con-sistent with the paleomagnetic data, which show that the Donggutuo Palaeolithic site lies just below the onset of the Jaramillo normal subchron (0.99-1.07 Ma). Furthermore, our results indicate that the reliable ESR dating range of bleached quartz using Ti-Li centre can be effectively extended to 1100 ka and the Ti-Li centre was zeroed before the last deposition, which requires improvement of the understanding of the bleaching mechanism conditions.

11

Osteology of the Late Cretaceous alvarezsauroid Linhenykus monodactylus from China and comments on alvarezsauroid biogeography

41%

Xu X. , Upchurch P. , Ma Q. , Pittman M. , Choiniere J. , Sullivan C. , Hone D. W. E. , Tan Q. , Tan L. , Xiao D. , Han F.

Acta Palaeontologica Polonica

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2013

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tom 58

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nr 1

EN

The alvarezsauroid theropod Linhenykus monodactylus from the Upper Cretaceous of Inner Mongolia, China is the first knownmonodactyl non−avian dinosaur, providing important information on the complex patterns of manual evolution seen in alvarezsauroids. Herewe provide a detailed description of the osteology of this taxon. Linhenykus shows a number of fea− tures that are transitional between parvicursorine and non−parvicursorine alvarezsauroids, but detailed comparisons also re− veal that some characters had a more complex distribution. We also use event−based tree−fitting to perform a quantitative analysis of alvarezsauroid biogeography incorporating several recently discovered taxa. The results suggest that there is no statistical support for previous biogeographic hypotheses that favour pure vicariance or pure dispersal scenarios as explana− tions for the distributions of alvarezsauroids across SouthAmerica, NorthAmerica andAsia. Instead, statistically significant biogeographic reconstructions suggest a dominant role for sympatric (or “within area”) events, combined with a mix of vicariance, dispersal and regional extinction. At present the alvarezsauroid data set is too small to completely resolve the biogeographic history of this group: future studies will need to create larger data sets that encompass additional clades.