Search

A type of reduced graphene oxide (rGO)/SnIn4S8 (SIS) nanocomposites was successfully fabricated by a facile and efficient microwave-assisted method. Their morphology, structure, composition, and optical performance were investigated by different analytical techniques, respectively. The results indicated that rGO had an important effect on the structure of photocatalysts. As the content of rGO increases, the unchin-like microsphere structure of rGO/SIS evolved gradually into aggregated nanosheet structure. The photocatalytic degradation experiments were carried out under visible light irradiation. The results demonstrated rGO/SIS-2 nanocomposites exhibited higher photocatalytic activity toward the degradation of RhodamineB than that of SIS, rGO/SIS-1 as well as rGO/SIS-3. Meanwhile, the mineralization efficiency of Rhodamine B (RhB) can reach up to 73.8% within 30 min. Interestingly, rGO/SIS-2 nanocomposites exhibited excellent recycle stability with 96% removal efficiency of RhB after three cycles. The enhanced photocatalytic activity of rGO/SIS-2 nanocomposites should be attributed to the strong interaction of rGO and SIS, the decrease of band gap energy, the enhanced visible light absorption, and excellent electrons’ mobility of rGO, thereby promoting charge separation. Finally, the mechanism of rGO/SIS nanocomposites for the degradation of RhB has been also proposed. This work provides a facile and efficient pathway to prepare SIS-based nanocomposites with enhanced catalytic efficiency by combining the advantages of microwave-assisted heating and incorporating carbon-based nanomaterials for the degradation of organic pollutants in visible light irradiation.

Objective To explore the effect of mindfulness training on anxiety symptom of Chinese college students with high anxiety and its internal mechanism. Methods A total of 2 416 college students from two universities in Beijing were evaluated and recruited according to their scores. They were divided into intervention group and control group with twenty in each. All students were pre-tested by State-trait Anxiety Inventory Questionnaire (STAI) and the Five-factor Mindfulness Questionnaire (FFMQ). After that, students in the intervention group received an 8-week training of mindfulness cognitive therapy. After the training, all students were post-tested with the same scales. Results Mindfulness training reduced state anxiety (F=6.21, P＜0.001) and trait anxiety scores (F=6.15, P＜0.001) in the intervention group, improved their total score of mindfulness (F=6.26, P＜0.001), observation (F=5.21, P＜0.01), description (F=6.24, P＜0.001) and non-response(F=5.80, P＜0.01). Conclusions Mindfulness training effectively reduces the anxiety symptoms of college students with high anxiety.

Objective To analyze the effect of laparoscopic side-to-side jejunoileal anastomosis on blood glucose and lipid metabolism in type 2 diabetes mellitus（T2DM） patients. Methods The clinical data of 52 patients with T2DM diagnosed in Jilin Province FAW Hospital from January 2018 to February 2019 who underwent laparoscopic side-to-side jejunoileal anastomosis were retrospectively analyzed. The changes of total cholesterol（TC）, triacylglycerol（TG）, high-density lipoprotein cholesterol（HDL-C）, low-density lipoprotein cholesterol（LDL-C）, and glycosylated hemoglobin（HbA1c） before and 3 years after the operation were analyzed. Results Among the 52 patients, 23 had complete remission, 11 had partial remission, 8 had significant improvement, and 10 had no effect at 3 years after surgery. The overall effective rate of blood glucose control was 80.77%. In the control goal of preventing atherosclerosis cardiovascular disease（ASCVD） high-risk groups in T2DM patients, the rate of reaching the target of LDL-C＜2.6mmol/L（74.19% vs 12.90%） and TG＜1.7mmol/L（77.42% vs 48.39%） after surgery were significantly higher than those before surgery（P

The title metal-organic coordination complex [Zn(pt)(Biim)2] (pt=phthalic acid, benzene-1,2-dicarboxylate, Biim=2,2'-biimidazole) 1 has been obtained by using hydrothermal synthesis and characterized by single-crystal X-ray diffraction. The complex crystallizes in monoclinic, space group P21/n with a = 8.5466(15) Å, b = 11.760(2) Å, c = 20.829(4) Å, β = 95.56(2)º, V = 2083.5(6) Å3, Mr =497.78, Dc = 1.587 g/cm3, μ(MoKα) = 1.226 mm−1, F(000) = 1016, Z = 4, the final R = 0.0564 and wR = 0.1851 for 3656 observed reflections (I > 2σ(I)). The elemental analysis, IR, TG and the theoretical calculation were also investigated.

In order to achieve the targets of Paris Agreement and carbon neutrality, developing CO2 negative emission technologies such as biomass energy with carbon capture and storage (BECCS) is of great significance. Biomass integrated calcium looping gasification combined cycle (CL-BIGCC) with in situ carbon capture during gasification is an attractive option among various options. In this work, Aspen Plus software was used to establish the thermodynamic model of CL-BIGCC system based on "gasification-combustion" dual reactors and traditional biomass integrated gasification combined cycle (BIGCC) system with carbon capture. The reliability of both models was first verified, and then, energy analysis and exergy analysis were used to examine the loss of key units and overall performance for the two systems. The results showed that comparing with the BIGCC system, the CL-BIGCC system significantly promoted the overall exergy efficiency. The largest two sources of exergy loss for the CL-BIGCC system were the "gasification-combustion" dual reactors and the gas turbine. Under a typical case with CO2 capture efficiency larger than 90%, the energy efficiency, exergy efficiency, and CO2 specific emission of the CL-BIGCC system were 42.42%, 38.77%, and 58.45 g kWh−1, respectively. Moreover, the effects of key parameters such as gasification temperature, steam to carbon molar ratio, and gas turbine compression ratio on the exergy loss and overall performance of the CL-BIGCC system were discussed. Finally, the calculated results of a typical case of CL-BIGCC system were compared with those of other reported BIGCC systems with carbon capture in literature, which verified the advantages of CL-BIGCC system over other BIGCC systems with negative carbon emission. [ABSTRACT FROM AUTHOR]

Waste cooking oil's (WCO's) potential as a rejuvenator of aged asphalt has received attention in recent years, with the acid value of WCO affecting its rejuvenation effect. This study explored the rejuvenation effect of WCO with a high acid value on aged asphalt by using molecular dynamics simulation. First, the representative molecules of WCO with a high acid value and asphalt were determined. The rejuvenation effect of WCO on aged asphalt was analyzed by adding different contents of WCO to an aged asphalt model. The effect of WCO on the thermodynamic properties of the aged asphalt was analyzed. The results show that WCO can restore the thermodynamic properties of aged asphalt binder to a certain extent. Regarding the microstructure of rejuvenated asphalt, WCO molecules dispersed around asphaltenes weakened the latter's aggregation and improved the colloidal structure of the aged asphalt. In terms of interface adhesion properties, WCO can improve the adhesion properties between asphalt binder and SiO2, but it has limited influence on water sensitivity. The results allowed us to comprehensively evaluate the rejuvenation effect of WCO with a high acid value on aged asphalt and to explore its rejuvenation mechanism. [ABSTRACT FROM AUTHOR]

The integration and co-location of new energy sources and thermal power generation within the same grid connection point, under the management of a single market operator, provide noteworthy potential for exploration in the northern part of our nation. This method is based on the premise of allocating new energy resources primarily for generating contracted electricity, while using thermal power to offer ancillary services. This strategy aims to integrate and use the distinct benefits of both thermal power and new energy sources. The yearly bilateral trade market has significant potential for growth and development. In order to model and evaluate the income generated by the interconnected system's involvement in the yearly bilateral trading market, this study first establishes the definition of the interconnected system and examines its research significance in engaging in annual bilateral trading. This study utilizes the theoretical framework of master-slave games to analyze the involvement of a coupled system in yearly bilateral trade. The specific case examined in this research is a wind-solar-thermal coupling system located in a particular location of Liaoning Province. This study examines the economic advantages of engaging in the electricity market by considering the marginal cost and LCOE (Levelized Cost of Electricity) perspectives. The findings suggest a notable enhancement in the advantages of the integrated system inside the yearly bilateral trade market, in contrast to conventional power sources present in the market, as well as instances when these sources function autonomously without integration. [ABSTRACT FROM AUTHOR]