简介：本文通过理论研究和现场实践经验,较系统的总结了影响网络速度的各种原因,从网络带宽、网络线路、网络设备故障、端口瓶颈、病毒、防火墙等对网速的影响等方面综合分析,并提出了改进和防范措施,对计算机用户和网络维护人员分析判断网络故障、改善网络运行速度、合理使用网络资源有较高的借鉴价值。

简介：a．增大环流量：增大吸嘴内径，改圆形吸嘴为椭圆形；b．增大驱动氩气流量；c．增大泵的抽气能力，其中采用水环泵和蒸汽泵联用可提高泵的抽气能力，降低RH能耗和水耗；

简介：介绍了厚板火焰切割的几种常见切割缺陷类型及影响因素,并以中板厂为例,探讨＂调火焰、定速度＂的厚板火焰切割质量控制措施,实现最佳切割效果。

简介：Cr2O3-formingferriticstainlesssteelshavebeenwidelyexploredasintermediatetemperaturesolidoxidefuelcells（SOFCs）interconnects.However,theevaporationofchromiascalemightmigratetoandpoisonthecathode,leadingtodegradationofthecellperformance.Inthisstudy,Ni-Co-Fe-Pcoatingsweredepositedontheferriticstainlesssteelbymeansofacost-effectivetechniqueofelectrolessmethod.Theyareexpectedtobeconvertedinto（Ni,Co,Fe）3O4spinelwithahighelectricalconductivityandCTEmatchwithstainlesssteel,whichcanblocktheevaporationofchromiaformedonsteelsubstrateexposedtothecathodeenvironmentoftheSOFC.TheeffectsofpH,massratioofFeSO4/（FeSO4+NiSO4+CoSO4）andtemperatureofsolutiononthedepositionrate,compositions,surfacemorphologiesandstructuresoftheNi-Co-Fe-Pcoatingswereinvestigated.TheresultsindicatedthatthedepositionrateincreasedwithincreasingpHwhenpHwaslowerthan9andthenreducedwhenpHwashigherthan9.Thedepositionrateincreasedwithincreasingtemperaturewhentemperaturewaslowerthan80℃andthendecreasedwhentemperaturewashigherthan80℃.ThedepositionratedecreasedwiththeincreaseinmassratioofFeSO4/（NiSO4+CoSO4+FeSO4）.ThecoatingsconsistedofNi,Co,FeandP.Thephasestructureofthecoatingwasamorphous.

简介：从制样方法及分析方法上对硅锰铁合金的分析方法进行了研究,采用定时、定压、定量制样、标准曲线制作等手段,主要对硅锰铁合金中Mn、Si、P等常规元素进行测定。对于X荧光光谱压片做了充分的前期准备工作,并对相关影响因素进行分析。该方法分析数据准确可靠,进而取得满意的分析结果。

简介：Advancedhighstrengthsteel(AHSS)hasbeenwidelyusedintheautomobileindustry.TheresistancespotweldingperformanceofDP980andQ&P980steelswasstudiedthroughcomparingthetwosteels'weldingcurrentrange,tensileshearstrength(TSS),crosstensionstrength(CTS),weldspots'microhardness,etc.Thefollowingconclusionswereachieved:ItiseasyforbothDP980andQ&P980steelstogetanuggetsizebiggerthan4mm,theyallhaveweldingcurrentrangesexceeding2kAandhighweldstrength.