[Evaluation of Shallow Groundwater Quality and Optimization of Monitoring Indicators in Nanchang].

In the process of groundwater environmental monitoring, while ensuring the representativeness of groundwater quality evaluation, the number of monitoring indicators should be optimized as much as possible, which is of great significance to groundwater environmental management. Based on monitoring data of shallow groundwater in Nanchang in 2014 and 2019, the chemical characteristics of water and the changes in water quality were analyzed via statistical analysis, a Piper three-line diagram, and the entropy-weighted water quality index (EWQI). Furthermore, a key indicator optimization method based on water quality evaluation was constructed by coupling stepwise multiple linear regression analysis.

[Effect of Er:YAG laser in pulp revascularization in miniature pigs].

Purpuse: To compare the effectiveness of Er:YAG laser and Ca(OH) in pulp revascularization in miniature pigs.

Methods: The second and third premolars of three 14-15-month-old miniature pigs were randomly divided into three groups: laser group, medication group and negative control group. After establishment of pulp necrosis model in each group, the negative control group had no more procedures, while the laser group and medication group were treated with pulp revascularization.

Stereotactic ablative radiotherapy versus lobectomy for stage I non-small cell lung cancer: A systematic review.

Background: There is debate regarding the use of stereotactic ablative radiotherapy (SABR) or surgery for patients with early stage non-small cell lung cancer (NSCLC). This meta-analysis compared the clinical efficacy of SABR and lobectomy in stage I NSCLC patients.

Methods: An online search identified eight eligible articles (including 2 trials and 7 cohort studies) for inclusion.

Ischemic preconditioning attenuates brain injury induced by ischemia/reperfusion during moderate hypothermia low-flow procedures.

Objective: We determined the effects of ischemic preconditioning (IP) on apoptosis in a rat model of brain injury induced by cerebral ischemia/reperfusion following a moderate hypothermic low-flow (MHLF) procedure.

Methods: A total of 180 rats were randomly divided into three groups. The surgery group was subjected to body temperature reduction and bilateral common carotid artery occlusion for 120 min at 25 ± 0.

[Simulation on contamination forecast and control of groundwater in a certain hazardous waste landfill].

On the basis of site investigation and data collection of a certain hazardous waste landfill, the groundwater flow and solute transport coupled models were established by applying Visual Modflow software, which was used to conduct a numerical simulation that forecast the transport process of Cr6+ in groundwater and the effects of three control measures (ground-harden, leakage-proof barriers and drainage ditches) of contaminants transport after leachate leakage happened in impermeable layer of the landfill. The results show that the contamination plume of Cr6+ transports with groundwater flow direction, the contamination rang would reach the pool's boundary in 10 years, and the distance of contamination transport is 1 450 m. But the diffusion range of contamination plume would not be obviously expanded between 10 and 20 years.

[Degradation effect and mechanism of 2,4-DNT by reduction-ZPF catalytic oxidation].

ZPF(zeoliteartificial pillared by alpha-FeOOH) which prepared in the laboratory and characterized by FTIR and XRD was used as catalyst, and was tested for its activity in catalytic H2O2, of 2,4-DNT, which is persistent and difficult to be degraded in groundwater. The degradation of 2,4-DNT was examined at different pHs in the reduction, catalytic oxidation and combination technology of reduction-catalytic oxidation reaction systems. Moreover, the removal effect of 2,4-DNT was compared by these three approaches and the catalytic oxidation mechanism was analyzed.