摘要：The Y2O3 crucibles were introduced in the study as an alternative to the traditional ceramic ones in vacuum induction melting of multi-component Nb-16Si-22Ti-2AI-2Hf-17Cr （at.%） alloys, to reveal the possible interactions between the alloy melt and the refractory crucible. Multiple melting time lengths and two cooling schemes were designed and used for the experiments. The chemical composition and microstructure of the tested alloy and the melt-crucible interaction were investigated and evaluated. In the experiments,Y2O3 crucible displays good physical-chemical compatibility. The results indicate that the increment of O element in the as-cast ingot iS： 0.03at.%-0.04at.% （72-97 ppm） and the increment of Y element is very insignificant. The key features of the alloy melt interacting with Y2O3 ceramics are analyzed and concluded in the paper. As a result of the dissolution reactiofi xY2O3 （in molten alloy） ＋ （1-x）HfO2 （impurity） →,Hf1-xY2xO2-x, a continuous double-layer solid film consisted of HfO2 solid solution （-2 pm） and pure HfO2 （-5μm） is formed on the surface of the test ingot after cooled down in the crucible. The experimental results show that theY2O3 crucible is applicable to the vacuum induction melting of Nb＇ Si based alloys.

摘要：This essay concentrates on two key procedures of image mosaic--image registration and *** the character of geometric transformation invariance of edge points, wecalculate the angle difference of the direction vector ofedge points in different images anddraw an angle difference histogramto adjust the rotationproblem. Through this way, algorithm based on gray information is expandedandcan be used in images withdisplacementand rotation. Inthe term of image fusion, wavelet multi-scale analysis is used to fuse spliced images. In order to choose the best method of imagefusion,weevaluate the results of different methods of image fusion by cross entropy.

摘要：In recent years,China’s public diplomacy has flourished,with literary exchanges and external communication undoubtedly becoming an essential *** with the progress of Chinese technology,science fiction literature has become a focal point both domestically and *** paper investigates the background of the Chinese science fiction literature’s national characteristics,the manifestation of these characteristics in works,and the advantages of communication from three *** also explores new ideas for the external communication of Chinese science fiction literature from the perspective of public diplomacy,inspiring new pathways for the integration of Chinese culture with the world,and telling Chinese stories to the world.

摘要：目的:建筑物的材质信息是灾害评估和城市调查等领域的重要信息。本文旨在利用高光谱遥感影像提取地面建筑物的表面材质信息(包括材质类型和主要组成成份),并对提取方法进行对比,给出应用建议。创新点:对建筑物材料进行光谱测试,并对其高光谱响应规律进行分析,找出有诊断意义的光谱位置;基于实验和验证得出应用方法的适应性,以提高信息提取精度。方法:1.设计建筑物材质信息提取流程(图1),并对高光谱数据进行基础处理;2.对建筑物材料进行光谱测试(波长范围为350~2500 nm,图3),并完成各类建筑物的诊断性光谱分析;3.利用光谱角度法(公式(1))和光谱信息散度法(公式(2))进行材质信息提取(图5和6);4.综合分析两种方法的应用过程与控制参数和准确率的关系。结论:1.两种方法皆可提取建筑物材质信息,但在应用过程中需要进行参数的适应性调整,这是提高准确率的关键;2.在建筑物材质信息提取方面,光谱角度法的提取准确率略高于光谱散度法。

摘要：Rural tourism is an important means of comprehensively promoting the rural revitalisation of industry andpractising the concept of“two mountains theory”.Rural tourism transforms the resource advantages of rural areasinto economic advantages,but its development entails problems such as the unfair distribution of benefits,uncleardistribution mechanisms,and the non-standardised compensation of ***,finding a mode of governance of rural tourism that can effectively achieve sustainable development is an urgent issue that warrants *** Jukou Township in Fujian Province as a case,this study constructs a logical framework linking theEco-bank model and rural tourism governance and reveals the practicality and sustainability of rural tourism governance under the Eco-bank *** study shows the following.(1)As a kind of innovative mechanism forachieving the transformation of resource value through the participation of multiple subjects,the Eco-bank modelsolves the development dilemma of rural tourism through the integration of decentralised resource managementrights,the establishment of property rights constraints and supervision mechanisms for the coordination of stakeholder interests,and the linkage and development of internal and external resources of the countryside.(2)JukouTownship has built a resource operation platform for“ancient house Eco-bank”based on ancient house resourcesand ecological tourism *** construction of a rural governance mechanism that combines village collectives,new township elites,villagers,high-end art operation units,and multiple institutional governance entities effectively converts idle ancient houses and high-quality ecological tourism resources into assets and funds to promote the development and growth of the rural collective economy while effectively promoting the stable and sustainable development of the cultural tourism industry in Jukou Township.

摘要：引江补汉工程深埋长大隧洞穿越通城河活动断裂,在活动断裂处隧洞的安全性是工程的关键问题之一。在地应力场分析基础上,采用数值模拟方法,分析了在不采用适应性结构时衬砌的响应,并估算了铰接设计参数,最终验算了建议铰接设计参数下衬砌的响应特征。结果表明:(1)水平大主应力与隧洞轴线夹角为35°,隧洞轴线方向水平应力分量约为20 MPa,垂直隧洞轴线方向水平应力分量约为21 MPa,竖直向应力分量约为18 MPa;(2)当无抗错断措施时,隧洞的相对变形主要表现为拱顶-底板的相对收敛,相对收敛在断层带部位最大,拱顶、底板部位的最大主应力量值出现在断层带及影响带部位,断裂带部位与影响带部位的衬砌大部分处于损伤状态;(3)基于提出的隧洞铰接设计参数的估算方法,给出了设防节段长度为6 m,铰节段宽度为2~4 cm作为初步的设计参数,进一步考虑参数敏感性分析后,合建议按照设防节段长度为6 m,铰节段宽度为5 cm考虑。(4)隧洞按照所建议参数进行铰接结构设防后,铰接结构设计有效降低了断层带内部衬砌整体所受到的拉力,铰接设计条件下,衬砌因错断产生的相对变形、应力、衬砌损伤均有较大程度减少。上述研究结果证实了铰接结构设计有助于提高隧洞抗错断性能。

摘要：以江西省萍莲高速莲花隧道为研究对象,分析了全风化页岩地层隧道仰拱开裂的主要原因。针对仰拱开裂区域裂缝的分布情况设计并开展了原位注浆加固试验,通过预埋压力传感器实时监测注浆过程中仰拱受力变化。基于加固后车辆动静载试验过程中荷载的传递特性,提出了一种新的注浆加固效果评价方法。结果表明:隧道底部软弱风化页岩遇水崩解变形是导致仰拱开裂的主要原因;仰拱底部注浆加固时将浆液水灰比从1∶1降低至0.8∶1可提高仰拱基底围岩加固效果,减少浆液流失。注浆加固后开展车辆动静载试验,结果显示荷载传递能力显著提高,表明基底围岩强度、完整性和稳定性显著增强。研究成果可为类似围岩条件下隧道仰拱开裂分析和注浆参数优化提供理论依据和技术支撑。

摘要：采用二次回归通用旋转组合设计方法,以马铃薯产量为目标,以栽培密度及氮磷钾肥的施用量为探讨对象,建立了马铃薯希森6号的产量与栽培密度、肥料施用量间关系的数学模型:Y=40.0485718+1.3954X_(1)+1.96625X_(2)+2.05875X_(3)+1.44875X_(4)-3.2137X_(1)^(2)-2.54495X_(2)^(2)-2.05745X_(3)^(2)-0.97245X_(4)^(2)+1.83437X_(1)X_(2)+2.41562X_(1)X_(3)+1.85062X_(2)X_(3)。通过模拟寻优,提出马铃薯希森6号产量≥40.00t/hm^(2)的相应农艺措施是每667m^(2)种植密度为5500~6500株,平均6000株;施氮肥25~30kg,平均27.5kg;施磷肥30~40kg,平均35kg;施钾肥40~50kg,平均45kg。

摘要：为了解决火电机组脱硝系统大延迟大惯性及传统Smith预估补偿控制抗扰与设定值跟踪性能的折中选择问题,引入二自由度Smith预估补偿控制策略,对火电机组脱硝进行控制系统设计,实现了设定值跟踪性能与抗扰性能的解耦。通过仿真研究,结果表明与传统脱硝串级控制及传统Smith预估补偿控制相比,能使调节时间相对于传统脱硝串级控制减少36%,在受到扰动后的最大动态偏差减少52%,调节速度快3~4倍,具备更佳的设定值跟踪和抗扰能力,同时算法实现简单无需复杂的编程仅通过DCS组态模块搭建即可实现,具备较大的应用与推广价值。

摘要：[目的]豪华邮轮对外观和工程协作设计的要求较高,但目前国内豪华邮轮设计模式在协作设计方面存在交叉界面不清晰的问题;因此,需明确船舶总布置对豪华邮轮外观设计的约束边界。[方法]基于对豪华邮轮外观设计影响因素的分区域解构和参数树梳理,选取主要影响因素,分析其在工程设计中受船舶规范公约、船舶安全以及工程经验的制约,给出外观设计创意发挥的边界条件。[结果]对于主体轮廓、侧立面视觉包络线、烟囱、艏艉功能区等诸多外形特征元素,在其符合工程设计要求的边界界定上通过确定各尺度比例关系的方式避免束缚外观创意。[结论]研究结果对于探索外观和工程设计协作模式、提升国内邮轮外观创新设计水平具备参考意义。