Two non-conjugated polymers PEIE-DBO and PEIE-DCO, prepared by quaternization of polyethyleneimine ethoxylate by 1,8-dibromooctane and 1,8-dichlorooctane respectively, are developed as electron transport layer(ETL) in...Two non-conjugated polymers PEIE-DBO and PEIE-DCO, prepared by quaternization of polyethyleneimine ethoxylate by 1,8-dibromooctane and 1,8-dichlorooctane respectively, are developed as electron transport layer(ETL) in high-performance inverted organic solar cells(OSCs), and the effects of halide ions on polymeric photoelectric performance are fully investigated. PEIE-DBO possesses higher electron mobility(3.68×10-4 cm2 V-1s-1), higher conductivity and more efficient exciton dissociation and electron extraction, attributed to its lower work function(3.94 eV) than that of PEIE-DCO, which results in better photovoltaic performance in OSCs. The inverted OSCs with PTB7-Th: PC71BM as photoactive layer and PEIE-DBO as ETL exhibit higher PCE of 10.52%, 9.45% and 9.09% at the thickness of 9, 35 and 50 nm,respectively. To our knowledge, PEIE-DBO possesses the best thickness-insensitive performance in polymeric ETLs of inverted fullerene-based OSCs. Furthermore, PEIE-DBO was used to fabricate the inverted non-fullerene OSCs(PM6:Y6) and obtained a high PCE of 15.74%, which indicates that PEIE-DBO is effective both in fullerene-based OSCs and fullerene-free OSCs.展开更多
Lime-fly ash loess is composed of fly ash, lime and loess. It is a new material in subgrade backfill. Main factors to influence the strength of lime-fly ash loess are age, amount of fly ash and lime, ratio of fly ash ...Lime-fly ash loess is composed of fly ash, lime and loess. It is a new material in subgrade backfill. Main factors to influence the strength of lime-fly ash loess are age, amount of fly ash and lime, ratio of fly ash to lime (1:K), and moisture content. In order to observe the effect of each factor influencing the strength of lime-fly ash loess and find out the relationship between each other, this paper adopted orthogonal test design to conduct unconfined compression tests. The result shows that 90d strength can be considered to calculate the strength of lime-fly ash loess in practice. And the most important factor to influence the 90d strength of lime-fly ash loess is the amount of fly ash and lime, the second is moisture content, and then is the ratio of fly ash to lime (1:K). These achievements are significant to the design and application of lime-fly ash loess in subgrade construction of loess areas.展开更多
目的分析总结腹腔镜保留十二指肠的胰头切除术(laparoscopic duodenum-preserving pancreatic head resection,LDPPHR)后常见并发症及预防治疗措施。方法回顾性分析沧州市中心医院普外科2018年6月至2021年6月期间完成的32例LDPPHR患者...目的分析总结腹腔镜保留十二指肠的胰头切除术(laparoscopic duodenum-preserving pancreatic head resection,LDPPHR)后常见并发症及预防治疗措施。方法回顾性分析沧州市中心医院普外科2018年6月至2021年6月期间完成的32例LDPPHR患者的临床资料。探讨术后并发症发生情况,并针对并发症的预防及处理措施进行分析和总结。结果32例患者均成功实施LDPPHR,术后并发症发生率为21.9%(7/32),其中包括严重并发症3例(1例术后长期胰瘘、1例术后十二指肠乳头狭窄致梗阻性黄疸、1例术后腹腔出血),均行二次手术治愈;轻微并发症4例,均为单纯性胰瘘,延长带管时间治愈。结论LDPPHR治疗胰头部良性病变技术上可行,但手术难度大,风险高,患者远期生存质量有待评价。展开更多
The hierarchical MoS_(2)/CoNi composites were successfully synthesized by a two-step hydrothermal method.The large surface area of the MoS_(2) enhances the dispersivity of the CoNi nanoparticles and the formation of a...The hierarchical MoS_(2)/CoNi composites were successfully synthesized by a two-step hydrothermal method.The large surface area of the MoS_(2) enhances the dispersivity of the CoNi nanoparticles and the formation of abundant MoS_(2)/CoNi interfaces,which make an important contribution to the dielectric loss,and the introduction of the CoNi improves impedance matching and introduces magnetic loss,which can improve the absorption performance to electromagnetic waves.Through the calculation of the electromagnetic parameters,the minimum reflection loss(RL)value of the MoS_(2)/CoNi composites achieves-41.44 dB at 13.53 GHz under a thickness of 2.0 mm and the corresponding effective absorption bandwidth(RL below-10 dB)is 5.6 GHz.The MoS_(2)/CoNi composite has the potential to be applied to microwave absorption due to its strong absorption and wide bandwidth.展开更多
基金the support from the National Natural Science Foundation of China (51873177, 51573153, 61564003 and 21875204)the group of Advanced Photoelectricity and Supermolecule Function Materials of Ministry of Education (IRT-17R90)+1 种基金the Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilizationsupport from Guangxi Bagui Scholar Program and Guangxi Natural Science Foundation (2015GXNSFGA139002)。
文摘Two non-conjugated polymers PEIE-DBO and PEIE-DCO, prepared by quaternization of polyethyleneimine ethoxylate by 1,8-dibromooctane and 1,8-dichlorooctane respectively, are developed as electron transport layer(ETL) in high-performance inverted organic solar cells(OSCs), and the effects of halide ions on polymeric photoelectric performance are fully investigated. PEIE-DBO possesses higher electron mobility(3.68×10-4 cm2 V-1s-1), higher conductivity and more efficient exciton dissociation and electron extraction, attributed to its lower work function(3.94 eV) than that of PEIE-DCO, which results in better photovoltaic performance in OSCs. The inverted OSCs with PTB7-Th: PC71BM as photoactive layer and PEIE-DBO as ETL exhibit higher PCE of 10.52%, 9.45% and 9.09% at the thickness of 9, 35 and 50 nm,respectively. To our knowledge, PEIE-DBO possesses the best thickness-insensitive performance in polymeric ETLs of inverted fullerene-based OSCs. Furthermore, PEIE-DBO was used to fabricate the inverted non-fullerene OSCs(PM6:Y6) and obtained a high PCE of 15.74%, which indicates that PEIE-DBO is effective both in fullerene-based OSCs and fullerene-free OSCs.
文摘Lime-fly ash loess is composed of fly ash, lime and loess. It is a new material in subgrade backfill. Main factors to influence the strength of lime-fly ash loess are age, amount of fly ash and lime, ratio of fly ash to lime (1:K), and moisture content. In order to observe the effect of each factor influencing the strength of lime-fly ash loess and find out the relationship between each other, this paper adopted orthogonal test design to conduct unconfined compression tests. The result shows that 90d strength can be considered to calculate the strength of lime-fly ash loess in practice. And the most important factor to influence the 90d strength of lime-fly ash loess is the amount of fly ash and lime, the second is moisture content, and then is the ratio of fly ash to lime (1:K). These achievements are significant to the design and application of lime-fly ash loess in subgrade construction of loess areas.
文摘目的分析总结腹腔镜保留十二指肠的胰头切除术(laparoscopic duodenum-preserving pancreatic head resection,LDPPHR)后常见并发症及预防治疗措施。方法回顾性分析沧州市中心医院普外科2018年6月至2021年6月期间完成的32例LDPPHR患者的临床资料。探讨术后并发症发生情况,并针对并发症的预防及处理措施进行分析和总结。结果32例患者均成功实施LDPPHR,术后并发症发生率为21.9%(7/32),其中包括严重并发症3例(1例术后长期胰瘘、1例术后十二指肠乳头狭窄致梗阻性黄疸、1例术后腹腔出血),均行二次手术治愈;轻微并发症4例,均为单纯性胰瘘,延长带管时间治愈。结论LDPPHR治疗胰头部良性病变技术上可行,但手术难度大,风险高,患者远期生存质量有待评价。
基金financially supported by the Key Scientific Research Projects of the Southwest University of Science and Technology(No.17zx910201)the Longshan Academic Talent Research Supporting Program of SWUST(Nos.18LZX437 and 18LZXT09)+1 种基金the Sichuan Science and Technology Program(No.2017TD0020)。
文摘The hierarchical MoS_(2)/CoNi composites were successfully synthesized by a two-step hydrothermal method.The large surface area of the MoS_(2) enhances the dispersivity of the CoNi nanoparticles and the formation of abundant MoS_(2)/CoNi interfaces,which make an important contribution to the dielectric loss,and the introduction of the CoNi improves impedance matching and introduces magnetic loss,which can improve the absorption performance to electromagnetic waves.Through the calculation of the electromagnetic parameters,the minimum reflection loss(RL)value of the MoS_(2)/CoNi composites achieves-41.44 dB at 13.53 GHz under a thickness of 2.0 mm and the corresponding effective absorption bandwidth(RL below-10 dB)is 5.6 GHz.The MoS_(2)/CoNi composite has the potential to be applied to microwave absorption due to its strong absorption and wide bandwidth.
