Anomalously low ozone of 1997 and 2011 Arctic spring: Monitoring results and analysis

Total ozone observations from the Total Ozone Unit (TOU) aboard the Chinese second generation polar orbiting meteorological satellite, Fengyun-3/A (FY-3/A), revealed that total column ozone over the Arctic declined rapidly from the beginning of March 2011. An extensive region of low column amount formed around mid March; monthly mean total column ozone in March 2011 was about 30% lower than the average observed during 1979—2010. Daily total column density of ozone near the center of low ozone area in mid March was less than 240 Dobson units, about half the total column ozone amount observed during the same period of the prior 10 years. We analyzed total column ozone data from different satellites during 1979—2011. Results show that the Arctic depletion of ozone in spring 2011 was initiated by the cold polar vortex in the lower stratosphere. The March mean total ozone over the Arctic has shown a decreasing trend over the past 32 years, and its variation is strongly correlated with the polar vortex. A similar low ozone process of spring 1997 was compared to that of 2011, but daily variations of total ozone in March over the Northern Hemisphere in 1997 and 2011 have different patterns

The Impact of Foreign Trade and Urbanization on Poverty Reduction: Empirical Evidence from China

Poverty eradication is a worldwide development challenge, and China’s poverty reduction experience, evident in its sustainable development strategy, is receiving increasing attention. China has achieved high economic growth and success in poverty reduction over the past 40 years, since its reform and opening up. China’s experience can provide lessons for other countries, however, the situation of poverty in China is still severe, and the remaining people experiencing that condition have long been in a state where income poverty, capability poverty, and intergenerational transfer of poverty coexist. This requires systematic poverty reduction in multiple fields such as the following: population, production, consumption, capital, technology, finance and taxation, education, health care and environment. Foreign trade and urbanization are the best ways to implement poverty reduction. Despite the fruitful results of international studies, the impact of foreign trade, urbanization and their synergistic effects on poverty reduction have not been fully considered. Therefore, by selecting, as panel data, the urbanization rate, foreign trade dependence, and multiple dimensions of poverty indicators of different provinces in China from 2000 to 2017, this paper establishes regression models to study the poverty reduction effects of urban and rural areas. This is accomplished by focusing on three dimensions: poverty gap; income level and gap; and the numbers of under-insurance and guaranteed expenditure, in terms of both imports and exports, respectively. The paper not only considers the synergistic effects of foreign trade and urbanization on poverty reduction, but also investigates the heterogeneity of poverty reduction effects between urban and rural areas. The research results can be applied not only to poverty reduction policy formulation in China, but they can also provide empirical lessons for other developing countries with large urban-rural disparities. Therefore, the study has important implications for both poverty reduction theory development and poverty reduction policy formulation

Temporal and Spatial Evolution of Eichmann Lake Wetland in Aksu River Basin and Its Response to Ecological Water Supply

Timely understanding and quantitative analysis of the changing trend in natural ecosystems in arid and semi-arid areas and their response to the ecological water supply process are of great significance for maintaining the health of oasis ecosystems. Taking the Eichmann Lake wetland of the Aksu River Basin in Xinjiang as the research area, the temporal-spatial distribution characteristics of the lake and the response of ecological water in recent years were studied based on remote sensing images and monitoring data. The results show that: (1) The water surface area of Eichmann Lake is shrinking, from 61.57 km2 in 1996 to 27.76 km2 in 2020. The changes in water surface area have experienced three stages: rapid decline, slow decline, and slow recovery. After the ecological water supply, the water surface area has obvious seasonal changes with hysteresis; (2) In areas with a low average water level, the ecological water supply has a significant impact on the groundwater level. The higher the water supply is, the higher the groundwater level will be. There is a significant lag effect between the change in the groundwater level and the response of the ecological water supply, which is 1–2 months; (3) The response characteristics of different natural vegetation to the ecological water supply were different in interannual, seasonal, and spatial contexts. The response of Populus euphratica to the ecological water supply is obvious, and its growth is the best within the range of 100–500 m from the water supply outlet. This research can provide the basis for the rational allocation of the Aksu River Basin’s water resources, and also act as a valuable reference for the restoration and reconstruction of surrounding vegetation in the Aksu River irrigation area

Isolation, identification, and characterization of an Aspergillus niger bioflocculant-producing strain using potato starch wastewater as nutrilite and its application.

A bioflocculant (MBFA18) was produced by Aspergillus niger (A18) using potato starch wastewater (PSW) as nutrients. The cultivation processes and flocculating treatment for PSW purification were systematically studied. The flocculating rate of the MBFA 18 achieved 90.06% (kaolin clay) under the optimal cultivation condition (PSW with 5950 mg/L COD, 20 g/L glucose, 0.2 g/L urea and without phosphorus source addition and pH adjustment). Furthermore, effects of flocculant dosage, initial pH, coagulant aid (CaCl2) addition and sedimentation time on the PSW treatment were discussed and studied in detail. The optimum flocculation treatment conditions were determined according to the treatment efficiency, cost and flocculation conditions. During the PSW treatment, 2 mL/L bioflocculant (1.89 g/L) dosage and 0.5 mol/L coagulant aid addition were applied without pH adjustment and 91.15% COD and 60.22% turbidity removal rate could be achieved within 20 min. The comparative study between the bioflocculant and conventional chemical flocculants showed excellent flocculating efficiency of MBFA 18 with lower cost (4.7 yuan/t), which indicated that the bioflocculant MBFA 18 produced in PSW substrate has a great potential to be an alternative flocculant in PSW treatment

Hydrodynamics of gas-solid turbulent fluidized bed of polydisperse binary particles

National Ministry of Science and Technology of China [2010CB226906, 2012CB215000, 2012CB21500402]; National Natural Science Foundation of China [21076171]; State Key Laboratory of Heavy Oil Processing (China University of Petroleum) [2012-1-08]The hydrodynamics of binary mixture of polydisperse particles in a turbulent fluidized bed was investigated by experiment and numerical simulation in this paper. A computational fluid dynamics model (CFD) coupled with population balance model (PBM) was developed, which combined the advantage of CFD model and PBM. The CFD model is applied to simulate the flow field and PBM is used to represent the particle size distribution (PSD). The effects of particle attrition and aggregation on particle behaviors were also considered. The model was validated by comparing simulation results with experimental data. Furthermore, five cases with different types of polydispersity, involving a continuous PSD of single component, a binary mixture of continuous PSDs without much difference between predominant sizes, a binary mixture of continuous PSDs with significant difference between predominant sizes, a continuous PSD of single component undergoing attrition and a continuous PSD of single component undergoing aggregation, were tested. The mixing behavior of polydisperse binary mixture in the turbulent fluidized bed was also obtained numerically. The results showed that the model was effective in describing the mixing behavior of binary mixture of polydisperse particles. In the binary mixture of particles with PSDs of minor difference system, the large particles first sink down into the small particle layer along the wall, and then along the central axis. However, for the binary mixture of which PSDs are with significant difference, the large particles go into the small particle layer along the central axis first. (C) 2014 Elsevier B.V. All rights reserved

Overexpression of long non-coding RNA SOX2OT promotes esophageal squamous cell carcinoma growth

Abstract Background SOX2 overlapping transcript (SOX2OT) has been reported to be an important lncRNA in various cancers. SOX2 is embedded in an intron of the SOX2OT gene. But the role of SOX2OT in esophageal squamous cell carcinoma (ESCC) and the association between SOX2OT and SOX2 remain unclear. Methods Quantitative PCR (qPCR) was used to detect the expression of SOX2OT and SOX2 in ESCC tissues and cells. The isoforms of SOX2OT were identified by PCR and confirmed by sequencing. CCK-8 and Edu assays were performed to investigate the effects of SOX2OT on cell growth. The relationship between SOX2OT and SOX2 was explored by luciferase reporter assay. Results Both SOX2OT and SOX2 were upregulated in ESCC tissues and cells. SOX2OT expression was positively associated with SOX2 expression in ESCC tissues. NR_004053 was one of the major SOX2OT transcripts aberrantly expressed in ESCC tissues and cells. Overexpression of SOX2OT (NR_004053) promoted ESCC cell growth, antagonized the effect of DDP and increased cell proliferation ratio. Ectopic expression of SOX2 could increase the luciferase activity of SOX2OT-pGL3/Basic and SOX2OT expression, while overexpression of SOX2OT (NR_004053) had no effect on SOX2 expression. Conclusion Our study demonstrates that the major isoform of SOX2OT in ESCC, SOX2OT (NR_004053) contributes to cell growth. SOX2 promotes SOX2OT expression at transcriptional level

Effect of carbon source on flocculating activity.

<p>Effect of carbon source on flocculating activity.</p

Recueil des actes administratifs de la Délégation générale du Gouvernement en Algérie : Lois et décrets...

08 avril 19601960/04/08 (A3,N30)-1960/04/08

Comparison of microorganisms cultivated in PDA and PSW substrate.

<p>Comparison of microorganisms cultivated in PDA and PSW substrate.</p