摘要：In order to improve the utilization rate of foam,an arc jet nozzle was designed for precise dust *** theoretical analysis,the different demands of foam were compared amongst arc jets,flat jets and full cone jets when the dust source was covered identically by *** is proved that foam consumption was least when an arc jet was *** production capability of an arc jet nozzle under different conditions was investigated through *** results show that with the gas liquid ratio(GLR)increasing,the spray state of an arc jet nozzle presents successively water jet,foam jet and *** a reasonable working condition range of foam production and a fixed GLR,foam production quantity increases at first,and then decreases with the increase of liquid supply *** the inner diameter of the nozzle is 14 mm,the best GLR is 30 and the optimum liquid supply quantity is0.375 m^3/*** results of field experiments show that the total dust and respirable dust suppression efficiency of arc jet nozzles is 85.8%and 82.6%respectively,which are 1.39 and 1.37 times higher than the full cone nozzles and 1.20 and 1.19 times higher than the fiat nozzles.

摘要：高效合成和功能性基团的引入是当前有机微孔聚合物材料研究的热点.采用强质子酸催化的腈基三聚环化反应,室温合成制备了一系列带有不同取代基的芴基共价三嗪骨架聚合物(FCTF1~FCTF3),系统研究了取代基的变化对所得材料光学性能、多孔性能及CO2吸附能力的影响.其中乙基取代的聚合物FCTF2具有最高的BET比表面积(621m2/g)和CO2吸附能力(1.8 mmol/g,273 K/1.1 bar).该研究有助于加深对有机微孔聚合物结构与性能关系的理解,对该类材料的分子设计有借鉴意义.

摘要：以汽车消声半壳模具为研究对象,采用数值模拟方法,在揭示模具表面摩擦特性对成形件厚度均匀性影响规律的基础上,对模具表面摩擦敏感区的摩擦特性进行优化设计。首先,对汽车消声半壳模具表面进行区域划分,利用ABAQUS对拉延成形过程进行数值模拟,采用单因素分析法,探究模具表面不同区域摩擦因数对工件厚度均匀性的影响,确定模具表面的摩擦敏感区域。其次,以板料厚度均匀性为优化目标,采用均匀设计法,对摩擦敏感区的摩擦特性进行了优化设计,最终获得消声半壳模具表面最优摩擦因数组合。优化后的模拟结果显示,成形件最薄处的破裂可能性降低了13.03%,成形件厚度的变化幅度降低了6.68%。为基于摩擦特性优化分布的模具表面激光微织构加工提供了设计依据。

摘要：Purpose Skin pigmentation disorders,such as vitiligo and melasma,are difficult to diagnose in the early stages,but abnor-mal tyrosinase levels and tyrosinase activity are potential *** resorufin-based fluorescence probes(RBFPs)have been designed to detect tyrosinase in tumors,but they have not been used in skin pigmentation *** this study,one of these RBFPs(synthesized by resorufin salt coupled with 3-(bromomethyl)phenol)was evaluated *** The RBFP was tested in different kinds of mouse and human skin cells,as well as in in vivo models,including zebrafish,guinea pigs,and Sprague-Dawley *** addition,small interfering RNAs(siRNAs),kojic acid,and 1-phenyl-2-thiourea(PTU)were used to inhibit tyrosinase levels or tyrosinase *** This probe successfully detected tyrosinase and emitted red fluorescence in melanoma cells and *** was also observable in zebrafish and on the skin of guinea pigs when using the *** mouse and human cells,the RBFP showed good selectivity to ***,in the case of decreased tyrosinase levels or activity caused by siRNAs,kojic acid,or PTU,the probe was sensitive to these ***,the RBFP showed no toxic effects at concentrations of<20μmol/L,both in vitro and in *** Our findings indicate the value and limitations of the RBFP in tyrosinase detection,but suggest the need for further improvement of fluorescent probes in the diagnosis of skin pigmentation disorders.

摘要：目的比较无托槽隐形矫治器治疗不同垂直骨面型下颌后缩青少年患者的临床疗效。方法选择盐城市口腔医院正畸科门诊2017年6月至2018年12月收治的主观选择隐形矫治器的下颌后缩替牙期和恒牙初期患者适应证患者42例,按照下颌平面角(FMA)值分为低于均角组(20例)和高于均角组(22例),均使用时代天使A6矫治器进行治疗,比较每组治疗前后的头影测量数据,并对两组数值变量大小做统计分析。结果两组患者治疗后SNB角显著增大(P0.05)。结论无托槽隐形矫治器可以有效矫治不同垂直骨面型的下颌后缩青少年患者。通过合理的设计能有效控制高角患者的下颌平面角增大趋势。

摘要：Porous organic polymers(POPs)are an emerging class of porous materials,having many promising applications in a variety of *** them,covalent triazine frameworks(CTFs)featuring conjugated and porous structures can be well applied in *** achieve high optoelectronic performance,usually the design and synthesis of CTFs based on appropriate building blocks is *** we report the synthesis of two fluorescent CTFs based on typical fluorescent building blocks,in which CTF-Py constructed from a pyrene(Py)building block was reported for the first time,showing prospective applications in the sensing of nitroaromatics with high sensitivity,and photocatalytic water splitting and carbon dioxide reduction with high performance in comparison with other porous organic materials.

摘要：通过研究江苏省主题创意农园的空间分布情况及其影响因素,为江苏省"12311"特色培育计划的实践建设提供理论参考。以江苏省主题创意农园287处为研究样本,基于网络数据平台爬取研究点空间信息,利用ArcGIS空间分析手段和地理探测器分析方法,探究江苏省主题创意农园的类型与空间分布及其影响因素,并得出以下结论:(1)江苏省主题创意农园可划分为主题创意类、农事体验类、农业科技类、休闲观光类、科普教育类5个主类;各类农园点的空间分布类型均为聚集分布。(2)主题创意农园全省整体空间分布类型是聚集分布,空间分布密度整体呈中南部分布密集、北部组团化聚集格局。(3)影响全省主题创意农园空间分布差异的三大主要影响因素是农业基础、生活水平以及交通条件,核心因子是自然条件里的距长江距离。同时给予以下建议:均衡区域发展,优化"一带两核心"空间格局;依据区域地方特色,构建主题特色片区;优化区域交通网络,完善旅游服务设施。

摘要：[目的]牵引载荷和制动载荷过大,是城市轨道交通车辆牵引梁-枕梁-缓冲梁结构(以下简称“牵枕缓结构”)焊缝产生疲劳裂纹的重要原因之一。为了有效控制车辆结构产生裂纹的可能性,需要在设计阶段对牵引与制动工况下车辆结构强度的分析方法进行深入研究。[方法]以我国某城市轨道交通线路为研究对象,通过线路试验数据分析受力点载荷的相位关系,对牵引与制动工况下载荷的相位测试结果进行分析。在阐述牵引与制动工况下载荷分配理论的基础上,设计了4个有限元模型约束方案,以分析不同方案下的车辆牵枕缓结构强度,对比仿真载荷值与试验载荷值。选取牵枕缓结构与底架焊接的3处主要焊缝,分析了3处焊缝在4个建模方案下的疲劳评估结果。[结果及结论]方案1—方案3下,载荷通过惯性载荷的形式施加,牵引与制动工况下受力点的载荷分配比例、受力方向同列车运行时的载荷分配比例、受力方向不一致。方案4(集中力加载形式)能较好地反映受力点载荷的相位关系及载荷大小。

摘要：文章着重从城市交通管理设施的创意设计现状及发展前景进行阐述,提出更为人性化、趣味化的设计思路,并对新技术、新材料、新工艺在城市交通设施创意设计的应用提出了展望。

摘要：本文试从音乐心理学的学科定位、学科架构的角度,回顾这一专业复苏初期,在高校教育教学的发展情况,为今后我国音乐心理学的发展和学科建设提供一定参考。经过学者们二十年的努力,音乐心理学在千年之交在教学、论著、研究等方面已形成了一定规模,音乐心理学的人才培养、研究队伍在逐渐壮大,产生了许多优秀成果,为新世纪的发展做好了铺垫。