摘要：We synthesized a mesoporous film based on TiO2-reduced graphene oxide(RGO)hybrids using a one-step vapor-thermal method without the need for an additional annealing *** vapor-thermally prepared TiO2-graphene hybrid(VTH)features unique structures with an ultra-large specific surface area of^260 m^2 g^-1 and low aggregation,giving rise to enhanced light harvesting and increased charge generation and separation *** was observed that a mesoporous film with uniform pore distribution is simultaneously obtained during the VTH growth *** a 5.0 wt%RGO VTH film was used as the active layer in photocatalysis,the highest photocatalytic activity for degradation of methyl orange was *** another,when a 0.75 wt%RGO VTH film was used as the photoanode in a dye-sensitized solar cell,the power conversion efficiency reached 7.58%,which represents an increase of 73.1%compared to a solar cell using an a photoanode of pure TiO2 synthesized by a traditional solvothermal *** is expected that this facile method for the synthesis of TiO2/graphene hybrid mesoporous films will be useful in practical applications for preparing other metal oxide/graphene hybrids with ultra-high photocatalytic activity and photovoltaic performance.

摘要：【目的】通过探究不同施肥处理对核桃生育期土壤养分及产量的影响,明确提高核桃园土壤肥力的最佳施肥方案,为核桃树施肥提供科学依据。【方法】以‘香玲’核桃园土壤为研究对象,共设计5种施肥处理:不施肥(CK)、单施化肥(CF)、化肥+有机肥(CF+OF)、化肥+生物有机肥(CF+BOF)和化肥+有机肥+生物有机肥(CF+OF+BOF)。通过测定核桃关键生育期土壤有机质(SOM)、全氮(TN)、硝态氮(NO_(3)^(-)-N)、铵态氮(NH_(4)^(+)-N)、速效磷(AP)及速效钾(AK)含量,分析有机无机肥配施对核桃产量和土壤养分的影响。【结果】CF、CF+OF、CF+BOF和CF+OF+BOF处理的核桃产量是CK处理的1.79、2.36、3.25和4.11倍。各处理SOM含量在花期均达最大值,其大小依次为:CF+OF+BOF>CF+BOF>CF+OF>CF>CK,CF+OF+BOF处理SOM达到15.88 g/kg;CF+OF、CF+BOF和CF+OF+BOF显著高于CK和CF(P<0.05)。各处理TN含量在硬核期达到最高,其中CF+OF+BOF处理极显著高于其余处理,为4.70 g/kg(P<0.01);萌芽期CF+OF+BOF的NO_(3)^(-)-N含量显著高于其余处理,为12.54 mg/kg(P<0.05);CF处理NH_(4)^(+)-N含量极显著高于其余处理,为28.56 mg/kg(P<0.01)。CF+OF、CF+BOF和CF+OF+BOF的AP含量在萌芽期达到最高值,分别为79.51、88.33和117.61 mg/kg,且显著高于CK和CF(P<0.05);花期CK、CF、CF+OF和CF+OF+BOF的AK含量达到峰值,分别为140.86、148.40、160.67和164.57 mg/kg。【结论】与CK相较,CF、CF+OF、CF+BOF、CF+OF+BOF均增加了土壤的养分含量,有机无机肥配施效果均优于CF,其中以CF+OF+BOF对土壤肥力提升的效果最佳,因此,通过有机无机肥配施为核桃整个生长发育过程稳定持续地供应养分,促进核桃树体对土壤养分的吸收利用,进而显著提高核桃果实的产量。

摘要：手工焊接后的多层瓷介电容器在温度循环试验过程中发生烧毁故障,故障原因为焊接过程中热应力较大导致器件本体生成裂纹。设计手工焊接试验,并经验证得出结论:在手工焊接过程中,通过降低手工焊接温度,增加焊接前印制电路板(PCB)的预热,可以避免器件本体产生裂纹;在产品设计阶段,避免选用较大尺寸封装,为PCB设计非接地焊盘,可以提高手工焊接的工艺窗口,从而提升多层瓷介电容器手工焊接质量。

摘要：对网口电路PCB设计中的常见问题及解决技术进行了研究。RJ45接口通常用于数据传输,最常见的应用为网卡接口封装。在PCB设计中要考虑信号的传输距离,隔离外部环境对芯片的影响,并减少周围设备的相互影响。