Orthokeratology with increased compression factor in adolescent myopia control: a 2-year prospective randomized clinical trial.

Aim: To explore the long-term efficacy, safety, and optical mechanism of orthokeratology with increased compression factor in adolescent myopia control.

Methods: A prospective, double-masked, and randomized clinical trial was performed from May 2016 to June 2020. Subjects aged between 8 and 16y, with myopia (-5.

[Source Profiles and Impact of VOCs Based on Production Processes in Foundry Industries].

The characteristics of the VOCs species in foundry industries based on the production processes were analyzed through gas chromatography-mass spectrometry (GC-MS) after sampling the emissions of VOCs in 9 typical foundry enterprises using air packages and absorption tubes. The source profiles of the VOCs species in foundry industries based on production processes were established for the first time in China. In addition, the emission characteristics of VOCs and the contribution of VOCs emitted by various production processes to ozone generation were also studied.

[Inventory and Distribution Characteristics of China's Thermal Power Emissions Under Ultra-Low Reconstruction].

This study updates a bottom-up high-resolution emission inventory and estimates the concentrations, emission factors, emissions, and performance values of China's power plants, based on the data from continuous emission monitoring systems and environmental statistics in 2018. The results show that the ultra-low emission policy has significant effects: the average concentrations of SO, NO, and PM in thermal power plants were 37.57, 56.

[Contribution of Emissions from Cement to Air Quality in China].

This study analyzed the concentrations of exhaust gas in the process (kiln head and kiln tail) of China's cement industry, based on data from continuous emission monitoring systems network in 2018. The cement emission inventory for China with high resolution (high resolution cement emission inventory for China, HCEC), using the bottom-up approach, was established. The results indicated that during 2018, the total emissions of PM, SO, and NO were 72893, 92568, and 878394 t, respectively.

[Contribution of Emissions from the Iron and Steel Industry to Air Quality in China].

Based on the data from a continuous emission monitoring systems network in 2015, this study analyzed the compliance rates of exhaust gas in the processes of China's iron and steel industry, and established a high-resolution steel plant emission inventory for China (HSEC, 2015), based on the bottom-up method. The contribution of emissions from the iron and steel industry to regional air quality was quantitatively simulated using a CAMx model. The results showed that in 2015, the total emissions of SO, NO, PM, PM, PCDD/Fs, VOCs, CO, BC, OC, EC, and F were 374800 t, 720500 t, 334800 t, 150300 t, 1.

[Health risk assessment of coke oven PAHs emissions].

Polycyclic aromatic hydrocarbons (PAHs) produced by coke oven are with strong toxicity and carcinogenicity. Taken typical coke oven of iron and steel enterprises as the case study, the dispersion and migration of 13 kinds of PAHs emitted from coke oven were analyzed using AERMOD dispersion model, the carcinogenic and non-carcinogenic risks at the receptors within the modeling domain were evaluated using BREEZE Risk Analyst and the Human Health Risk Assessment Protocol for Hazardous Waste Combustion (HHRAP) was followed, the health risks caused by PAHs emission from coke oven were quantitatively evaluated. The results indicated that attention should be paid to the non-carcinogenic risk of naphthalene emission (the maximum value was 0.

Environmental Risk and Assessment Management System of High-level Biosafety Laboratory.

How to avoid the potential risk from high-level biosafety laboratories (BSL-3, BSL-4) has been highly concerned by governments all over the world. Based on the study of construction status and environmental risk of high-level biosafety laboratories and on the study of the layout structure and bio risk measures of biosafety laboratory contaminants, this paper analyzed the key point of environmental risk, and proposed the risk management system of high-level biosafety laboratories. System framework and realization process is given in the paper in order to provide reference for domestic construction of high-level biosafety laboratories and the improvement of risk emergency system.