摘要：Flotation indexes gradually decrease with the increase of cycle time of the backwater in bauxite floatation,and discharge of backwater brings environmental *** this study,methods such as Fenton-oxidation,adsorption and coagulation were used in the treatment of backwater,the flotation indexes were checked after backwater treatments,and Box-Behnken design(BBD)was used in the optimization of the main operating *** results reveal that flotation indexes are effectively improved after coagulation treatment by polyaluminum ferric chloride(PAFC).The optimum parameters predicted by BBD are pH 7.55,1.09 g/L PAFC dosage and temperature of 25℃.Under these optimum conditions,a maximum recovery of Al2O3 of 82.83%and a minimum A/S of 1.30 of tailings are gained,while the deviations are less than 3%from the predicted *** findings encourage the application of BBD for the optimization of critical parameters in backwater treatment.

摘要：The bimetallic nanostructures that mix a plasmonic metal with a transition metal in the form of the core-shell nanoparticles are promising to promote catalytic *** it is still unclear how the heat(hot electrons and phonons)transfers on the interface between two *** have designed and synthesized Au@Cu bimetallic nanoparticles with Au as core and Cu as *** using transient absorption spectroscopy,we find that there are two plasmon induced heat funneling processes from Au core to Cu *** is the electron temperature equilibrium(electron heat transfer)with equilibration time of~560 *** other is the lattice temperature equilibrium(lattice heat transfer)with equilibration time of~13 *** plasmon induced heat funneling may be universal in similar bimetallic nanostructures,so our finding could contribute to further understanding the catalytic mechanism of bimetallic plasmonic photothermal catalysis.

摘要：4月18日晚,在深圳欢乐海岸,2021秋冬深圳时装周秀场的灯光亮了又暗,身穿犀流服装的模特穿梭在T台,将印花、格纹、流苏、盘扣、立领等元素组合呈现,64套男女装以“新风作浪”为主题,展现设计师高阳对自我不设限,追求新鲜有趣,强调组合搭配又崇尚自由的设计观念。

摘要：The direct hydrogenation of CO2 using H2 gas is a one-stone-two-birds route to produce highly valueadded hydrocarbon compounds and to lower the CO2 level in the ***,the transformation of CO2 and H2 into hydrocarbons has always been a great challenge while ensuring both the activity and selectivity over abundant-element-based *** this work,we designed a Schottky heterojunction composed of electron-rich MoC nanoparticles embedded inside an optimized nitrogen-doped carbon support(MoC@NC)as the first example of noble-metal-free heterogeneous catalysts to boost the activity of and specific selectivity for CO2 hydrogenation to formic acid(FA)in liquid phase under mild conditions(2 MPa pressure and 70℃).The MoC@NC catalyst with a high turnover frequency(TOF)of 8.20 molFA molMoC^-1 h^-1 at 140℃ and an excellent reusability are more favorable for real applications.

摘要：设计制作了17根630 MPa新型热处理带肋高强钢筋混凝土大偏心受压足尺柱试件,分析其破坏形态、侧向挠度、钢筋应变、混凝土应变及承载力,以研究630 MPa高强钢筋混凝土大偏心受压柱的受力性能和630 MPa高强钢筋的应力状态及抗压强度发挥水平。结果表明:630 MPa高强钢筋混凝土大偏心受压柱的典型破坏形态与普通钢筋混凝土相同;混凝土受压区所能达到的极限压应变大于现行规范采用的0.0033,有利于偏心受压构件中630 MPa高强钢筋抗压强度的充分发挥,达到与抗拉强度相同的值。各试件承载力试验值均远大于其承载力设计值,两者比值的平均值为1.887,用现行规范对630 MPa级高强钢筋混凝土柱构件进行设计计算是合理且安全的。提出了630 MPa高强钢筋在偏压构件中抗拉和抗压强度设计值取值均为545 MPa的建议,为制定高强钢筋混凝土结构应用技术规程和推广630 MPa高强钢筋的工程应用提供了试验依据。

摘要：利用3,4-二氰基噻吩(DCT)为电子受体单元,苯并双噻吩(BDT)为电子给体单元,并结合不同侧链取代的噻吩为π桥,设计合成了一系列新型宽带隙共轭聚合物:PB3TCN-C32、PB3TCN-C36、PB3TCN-C36-R以及PB3TCN-C40.这些聚合物具有较宽的光学带隙(>1.8 eV)、较深的最高占有分子轨道(HOMO)能级.与非富勒烯受体(IT-4F)结合制备了有机太阳电池器件,其中聚合物PB3TCN-C40实现了高达11.2%的能量转换效率(PCE),其开路电压(Voc)为0.92 V,短路电流密度(Jsc)为18.9 mA cm-2,填充因子(FF)为0.64,是目前文献报道基于氰基噻吩类聚合物材料的最好结果.同时,该体系具有低至0.6 eV的能量损失.这些结果表明DCT是一种极具潜力的实现宽带隙、深HOMO能级共轭聚合物的构筑单元,有望实现更高能量转换效率的有机太阳电池.

摘要：教学语言是课堂教学中师生之间进行交流思想的重要工具,教师的教学语言水平,是课堂教学能否取得高效的关键。教师要会运用语言艺术,捕捉最佳的教学时机,达到完美的教育学生的目的和高效的教学质量。

摘要：最新的C-NCAP测试工况包含了64 km/h的偏置碰及50 km/h的全正碰,对安全气囊的设计要求更高。基于某款从B级车平台开发的电动车,利用虚拟设计及CAE分析设计出满足C-NCAP碰撞5星目标要求的乘员侧气囊。通过气囊概念设计—车内爆炸模拟—静态展开试验—整车碰撞仿真的研究方法,获得整车碰撞优化配置参数,碰撞试验结果与仿真耦合理想。此项虚拟设计采用与物理验证相结合的方法,有助于高效地定义乘员侧气囊的设计参数。

摘要：在一台自行设计并搭建的新型螺旋式流态冰制取装置上,以醇类、盐类为添加剂加入制冰溶液,通过理论分析和实验研究制冰溶液特性对装置性能及流态冰产物的影响.结果表明,在该装置上螺旋式方法制取流态冰是可行的,所得流态冰分布均匀,具有良好的流动性,最大含冰率可达13.68%,流态冰中冰晶颗粒一般呈条状和扁圆状,平均冰晶颗粒面积为10^(-8)~10^(-9)m^2;流态冰出口温度与制冰溶液添加剂种类和浓度有关,实测温度接近同种溶液过冷相变阶跃终点温度;使用同种添加剂时提高制冰溶液浓度会延长装置流态冰产生时间并降低出口冰浆温度,促使其含冰率升高;溶液浓度对产物流态冰中冰晶粒度的影响则因溶液种类和浓度不同呈现不同规律.

摘要：在2013年的个展中,陈晓云沿用了自己最熟悉的创作手段,摄影与录像,向观众呈现了十一件照片和六件影像作品,一并延续的还有其作品中一直存在的诗性以及对现实的荒诞化呈现,引发了清晰的观看和复杂的观感两种混合体验.