Transport and retention mechanisms of highly suspended biochar in aquifer media.

Biochar-based in-situ reaction zones are promising methods for groundwater remediation. However, the transport and retention of biochar in aquifer media remain unclear. Herein, biochar with high suspensibility was developed through nitrogen doping.

Boosting Lithium Storage of a Metal-Organic Framework via Zinc Doping.

Lithium-ion batteries (LIBs) as a predominant power source are widely used in large-scale energy storage fields. For the next-generation energy storage LIBs, it is primary to seek the high capacity and long lifespan electrode materials. Nickel and purified terephthalic acid-based MOF (Ni-PTA) with a series amounts of zinc dopant (0, 20, 50%) are successfully synthesized in this work and evaluated as anode materials for lithium-ion batteries.

Alloying Motif Confined in Intercalative Frameworks toward Rapid Li-Ion Storage.

High-capacity alloying-type anodes suffer poor rate capability due to their great volume expansion, while high-rate intercalation-type anodes are troubled with low theoretical capacity. Herein, a novel mechanism of alloying in the intercalative frameworks is proposed to confer both high-capacity and high-rate performances on anodes. Taking the indium-vanadium oxide (IVO) as a typical system, alloying-typed In is dispersed in the stable intercalative V O to form a solid solution.

Assembling Iron Oxide Nanoparticles into Aggregates by LiPO: A Universal Strategy Inspired by Frogspawn for Robust Li-Storage.

The poor ionic conductivity of transition metal oxides (TMOs) is a huge obstacle to their practical application as anodes for lithium-ion batteries (LIBs). Although good performance can be harvested by constructing nanostructures, some other foundmental issues including low tap density and serious electrolyte consumption come along. Herein, inspired by frogspawn, we propose a universal strategy of using lithium salts to assemble TMO nanoparticles into large aggregates to improve their Li conductivity.

Share Rose, Get Fun: The Influence of Donation on Happiness.

There is little literature on the impact of donation on individual wellbeing in China. This study examines individual donations in China to answer the question of whether helping others makes us happier and to provide policy implications for in Chinese context. Based on the 2012 Chinese General Social Survey (CGSS) data and using ordered logit and OLS as benchmark models, this study finds that donation can significantly increase individual happiness.

Does the Internet Use Improve the Mental Health of Chinese Older Adults?

The Internet has become an important part of daily life. However, older adults in China remain digital refugees amid the rapid development of digital information technology. This study attempts to scientifically answer how Internet use affects the subjective welfare of older adults.

Internet Use, Life Satisfaction, and Subjective Well-Being Among the Elderly: Evidence From 2017 China General Social Survey.

The research objectives of this study are to test the scientific propositions of whether Internet use promotes life satisfaction among the elderly, whether there is variability in the effect of Internet use on the well-being of the elderly, and through what channels Internet use affects the elderly's life satisfaction. Using data from the 2017 Chinese General Social Survey (CGSS), this paper employed linear regression, ordered logit model, and the propensity score matching (PSM) approach to investigate the association of Internet use with life satisfaction among the elderly in China. The results show that Internet use was significantly and negatively associated with the life satisfaction of the Chinese elderly.

Research on International Cooperative Governance of the COVID-19.

Since the first case of the novel coronavirus (SARS-CoV-2) was reported in Wuhan, China, in December 2019, the coronavirus disease (COVID-19) has quickly spread to all the corners of the world. Amid the global public health threats posed by the COVID-19 pandemic, active cooperative governance has gradually emerged as the most powerful weapon against its spread. To facilitate international cooperation for pandemic governance, this paper applied the evolutionary game theory to analyze the factors influencing active cooperative governance and, based on the results, proposed a series of recommendations for promoting international cooperation.

Population migration, spread of COVID-19, and epidemic prevention and control: empirical evidence from China.

Background: This study applied the susceptible-exposed-infectious-removed (SEIR) model to analyze and simulate the transmission mechanisms of the coronavirus disease 2019 (COVID-19) in China.

Methods: The population migration was embedded in the SEIR model to simulate and analyze the effects of the amount of population inflow on the number of confirmed cases. Based on numerical simulations, this study used statistical data for the empirical validation of its theoretical deductions and discussed how to improve the effectiveness of epidemic prevention and control considering population migration variables.

Effects of Fertility Behaviors on Depression Among the Elderly: Empirical Evidence From China.

Increased population aging is associated with increased incidence of depression among the elderly. Existing studies have shown that ill-advised fertility behaviors during their youth also affect the health of the elderly. However, insufficient attention has been paid to depression among elderly in China.

Medical resources and coronavirus disease (COVID-19) mortality rate: Evidence and implications from Hubei province in China.

In light of the ongoing coronavirus disease (COVID-19) pandemic, this study aims to examine the relationship between the availability of public health resources and the mortality rate of this disease. We conducted empirical analyses using linear regression, a time-varying effect model, and a regression discontinuity design to investigate the association of medical resources with the mortality rate of the COVID-19 patients in Hubei, China. The results showed that the numbers of hospital beds, healthcare system beds, and medical staff per confirmed cases all had significant negative effects on the coronavirus disease mortality rate.

Population migration, confirmed COVID-19 cases, pandemic prevention, and control: evidence and experiences from China.

Aim: The virulence of the novel coronavirus disease (COVID-19) has facilitated its rapid transition towards becoming a pandemic. Hence, this study aims to investigate the association between population migration and the number of confirmed COVID-19 cases in China while investigating its measures for pandemic prevention and control.

Subject And Methods: A susceptible-exposed-infected-recovered-dormancy (SEIRD) model for the spread of COVID-19 in China was created to theoretically simulate the relationship between the populations migrating from Wuhan and the number of confirmed cases.

Adsorption of PFOA at the Air-Water Interface during Transport in Unsaturated Porous Media.

Miscible-displacement experiments are conducted with perfluorooctanoic acid (PFOA) to determine the contribution of adsorption at the air-water interface to retention during transport in water-unsaturated porous media. Column experiments were conducted with two sands of different diameter at different PFOA input concentrations, water saturations, and pore-water velocities to evaluate the impact of system variables on retardation. The breakthrough curves for unsaturated conditions exhibited greater retardation than those obtained for saturated conditions, demonstrating the significant impact of air-water interfacial adsorption on PFOA retention.

Evolution of wetland in Honghe National Nature Reserve from the view of hydrogeology.

There is wide concern about the evolution of wetlands, an important component of the global ecosystem. The Honghe National Nature Reserve (HNNR) is an internationally important marsh wetland in China that is at risk of degradation. To gain an improved understanding of how the HNNR wetland developed from 1975 to 2014, typical years, including 1975, 1988, 1996, 2002 and 2014, were selected based on precipitation date.

Soil heavy metal pollution and risk assessment in Shenyang industrial district, Northeast China.

To investigate the soil heavy metal pollution characteristics and ecological risk factors, 42 samples and six typical soil profiles were collected from the Shenyang industrial district in northeast China and were analyzed for contents of titanium (Ti), copper (Cu), lead (Pb), zinc (Zn), cobalt (Co), nickel (Ni), chromium (Cr) and arsenic (As). Through statistical analysis, it was found that the mean concentrations were higher than their background values (Ti = 4.77>3.

Response of the microbial community to seasonal groundwater level fluctuations in petroleum hydrocarbon-contaminated groundwater.

The effects of seasonal groundwater level fluctuations on the contamination characteristics of total petroleum hydrocarbons (TPH) in soils, groundwater, and the microbial community were investigated at a typical petrochemical site in northern China. The measurements of groundwater and soil at different depths showed that significant TPH residue was present in the soil in this study area, especially in the vicinity of the pollution source, where TPH concentrations were up to 2600 mg kg(-1). The TPH concentration in the groundwater fluctuated seasonally, and the maximum variation was 0.

Transport and fate modeling of nitrobenzene in groundwater after the Songhua River pollution accident.

In 2005 a pollution accident occurred in the Songhua River, which is geographically located next to groundwater supply plants. This caused public concern about the transport and fate of nitrobenzene (NB) in the groundwater. This paper discusses the mechanisms and effects of the transport and fate of NB in groundwater based on pilot scale experiments conducted in the laboratory, including a simulation experiment, bench-scale batch tests and a one-dimensional numerical model.

Mercury pollution in two typical areas in Guizhou province, China and its neurotoxic effects in the brains of rats fed with local polluted rice.

Guizhou province, which located in southwestern of China, is an important mercury (Hg) production center. This study was to investigate the environmental levels and ecological effects of mercury in two typical Hg polluted areas in Guizhou province. In addition, to improve the understanding of the neurotoxic effects of Hg, a rats based laboratory study was also carried out in this study.

Expression of c-fos in rat brain as a prelude marker of central nervous system injury in response to methylmercury-stimulation.

Objective: To probe into the prelude marker of central nervous system injury in response to methyl mercury chloride (MMC) stimulation and the signal transduction molecular mechanism of injury in rat brain induced by MMC.

Methods: The expression of c-fos mRNA in brain and the expression of c-FOS protein in cortex, hippocampus and ependyma were observed using reverse transcription polymerase chain reaction (RT-PCR) and immunocytochemical methods. The control group was injected with physiological saline of 0.

[Extreme thermophilic (70 degrees C), combining two-phase anaerobic/activated sludge/bio-activated charcoal for treating food wastewater].

This study was conducted to investigate the performance of combining two-phase anaerobic(TPA)/activated sludge(AS)/bio-activated charcoal(BAC), seeded with mesophilic sludge, for treating food wastewater at extreme temperature (70 degrees C) to allow treated water to be reused for closed heat water circuits. The system had a total hydraulic retention time of 42h. Reactor performance was characterized by COD, VFA, pH, amino-acid.

Effects of mercury contaminated rice from typical chemical plant area in China on nitric oxide changes and c-fos expression of rats brain.

China is one of countries with the highest mercury production in the world. The Guizhou Province in Southwestern China is currently one of the world's most important mercury production areas. In order to study the neurotoxicity of rice from Qingzhen Chemical Plant area and probe into the signal transduction molecular mechanism of injury in rat brain stimulation by mercury contaminated rice.

[Hydrolysis and mechanism of wastewater contained protein using immobilized protein enzyme].

Protein-enzyme was immobilized on big-hole resin, activated charcoal and silica particles by a absorption method. This study focuses on effect of enzyme immobilization, thermal stability and hydrolysis efficiency of wastewater. The result of batch test show that the ratio of immobilized enzyme on activated charcoal, big-hole resin and silica particles was 61.

Effect of methylmercury on some neurotransmitters and oxidative damage of rats.

In order to study the molecular mechanism of injury in rat organs induced by methylmercury, and the relationship between neurotransmitter and oxidative damage in the toxicity process of rat injury by methylmercury was studied. The control group was physiological saline of 0.9%, the concentration of exposure groups were 5 mg/( kg x d) and 10 mg/( kg x d) respectively.

[Experimental research on bioremediation of groundwater contaminated by herbicide atrazine].

The experimental research on the static degradation and treatment of groundwater contaminated by herbicide atrazine was conducted by using bacterium AT which was isolated from the sludge outlet of workshop of the pesticide factory. And the result indicated that bacterium AT had the ability of degradation of atrazine with pH ranged from 5.0 to 10.

Distribution and risk assessment of fluoride in drinking water in the west plain region of Jilin province, China.

The west plain region of Jilin province of northeast China is one of the typical endemic fluorosis areas caused by drinking water for many years. Investigations of hydrogeological and ecoenvironmental conditions as well as endemic fluorosis were conducted in 1998. Results show that the ground water, especially, the water in the unconfined aquifer is the main source of drinking water for local residents.