高分系列卫星数据在地质灾害解译中的应用

该文结合研究区的地质条件和人文经济活动状况,利用高分一号和高分二号卫星影像数据,对研究区内部的地质灾害进行遥感解译。首先,从地形地貌、影像特征等方面建立研究区的地质灾害解译标志,解译区域上地质灾害;然后,将遥感解译初步成果,提交给野外实地调查人员用于野外调查验证,重点解译崩塌、滑坡等的形态,规模,危害范围;利用DEM提取坡度大于50°的范围,以提高崩塌解译识别的准确率。该文可以为类似工程提供参考和帮助。     

稀土交换的β分子筛负载Pt催化剂上正庚烷的临氢异构化

A series of Pt catalysts supported on the Hβ-zeolite that is ion-exchanged with the rare earth metal ions of Ce(III) and La(III),are prepared by impregnation,characterized by inductively coupled plasma (ICP),X-ray diffraction (XRD),BET,temperature-programmed desorption of ammonia (NH3-TPD),temperature-programmed reduction of hydrogen (H2-TPR) and H2-chemisorption techniques,and evaluated in the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor.The reaction temperature,time on stream,space velocity,and the ratio of H2/n-heptane are changed to get the optimal conditions.The Ce(III) and La(III)-exchanged Hβ-zeolites exhibit higher selectivity for isomerized products than the neat Hβ-zeolite.Moreover,the Ce(III)-exchanged catalysts give higher conversions of n-heptane,whereas the La(III)-exchanged ones do not show any improvement in con-version.Under optimal conditions,the catalyst with 0.4% (by mass) Pt and 0.5% (by mass) Ce loading presents very high selectivity of isomerized products of 95.1% coupled with high n-heptane conversion of 68.7%.Effects of the ion-exchange of Ce(III) and La(III) on the catalytic performance are discussed in relation with the physico-chemical properties of catalysts.     

换流阀故障定位可视化方法研究

<正>基于现有换流阀故障定位系统存在OWS报文不能及时体现换流阀故障位置、监控界面缺少换流阀可视化模型及无法监控所有晶闸管的实时运行状态等问题,研究了一种新的换流阀可视化故障定位方法,并基于该策略设计出换流阀可视化故障定位系统。该系统可以直观显示故障换流阀的位置,便于运维人员进行进一步处理。     

基于GF-2影像的沈阳市黑臭水体遥感分级识别

城市黑臭水体遥感分级识别对于黑臭水体的监管及治理具有重要作用。针对目前黑臭水体遥感识别算法无法对河流黑臭程度分级这一问题,在沈阳市建成区内开展野外实验,对比分析一般水体、轻度黑臭水体和重度黑臭水体的反射率光谱差异,利用绿波段反射率的基线差值与红波段反射率之比,提出了一种城市黑臭水体遥感分级指数BOCI(Black and Odorous water Classification Index)模型。首先采用实测光谱数据对BOCI模型检验,并将其与改进后归一化比值模型进行对比,结果表明,BOCI模型具有更高的黑臭水体识别精度,且可以将重度黑臭水体与轻度黑臭水体区分开,解决了现有模型无法对黑臭水体污染程度分级的问题;然后将BOCI模型应用于沈阳市同步GF-2影像进一步检验,同样取得了较高的识别精度;最后将该模型应用于2015~2018年4景GF-2影像,对研究区内黑臭水体进行动态监测,结果显示,新开河、南运河和满堂河黑臭现象逐步得到改善,辉山明渠黑臭现象依然很严峻。     

Q235钢表面CO2堆焊药芯焊丝组织与性能研究

为提高Q235普通碳素结构钢的耐磨性能和耐腐蚀性能,采用CO₂气体保护焊在其表面堆焊药芯焊丝,利用蔡司高级金相显微镜、显微硬度测试仪、摩擦磨损试验机和电化学工作站等分析测试手段,研究不同焊接电流下的堆焊层的宏观形貌、显微组织、显微硬度、摩擦磨损性及耐腐蚀性。测试结果表明,当焊接电流为200 A时,堆焊层组织均匀,碳化物均匀弥散分布在组织内部,其显微硬度最高为500 HV,耐磨性能最好,磨损失重量为26 mg,磨损机理为磨粒磨损;当焊接电流为230 A时,热输入量最高,合金元素固溶于奥氏体基体的量增多,使其稳定性增加,从而提高了耐腐蚀性。     

稀土交换的β分子筛负载Pt催化剂上正庚烷的临氢异构化

A series of Pt catalysts supported on the Hβ-zeolite that is ion-exchanged with the rare earth metal ions of Ce(Ⅲ) and La(Ⅲ), are prepared by impregnation, characterized by inductively coupled plasma (ICP), X-ray diffraction (XRD),BET, temperature-programmed desorption of ammonia (NH3-TPD), temperature-programmed reduction of hydrogen (H2-TPR) and H2-chemisorption techniques, and evaluated in the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor. The reaction temperature, time on stream, space velocity, and the ratio of H2/n-heptane are changed to get the optimal conditions. The Ce(Ⅲ) and La(Ⅲ)-exchanged Hβ-zeolites exhibit higher selectivity for isomerized products than the neat Hβ-zeolite. Moreover, the Ce(Ⅲ)-exchanged catalysts give higher conversions of n-heptane, whereas the La(Ⅲ)-exchanged ones do not show any improvement in conversion. Under optimal conditions, the catalyst with 0.4% (by mass) Pt and 0.5% (by mass) Ce loading presents very high selectivity of isomerized products of 95.1% coupled with high n-heptane conversion of 68.7%. Effects of the ion-exchange of Ce(Ⅲ) and La(Ⅲ) on the catalytic performance are discussed in relation with the physicochemical properties of catalysts.