摘要：由于培训平台会受到不同来源的请求,导致其运行的稳定性难以得到保障,为此,提出基于云计算的民航专业教师开放式远程培训平台设计。将高性能、高稳定性的智能开发板——K3-3568开发板作为开放式远程培训平台的设计载体;构建包含用户界面层、学习资源层、互动交流层、数据分析层4部分的平台构架,并利用云计算技术实现了平台的开放式运行。测试显示,设计平台在不同运行工况下均表现出了较高的稳定性。

摘要：Horizontal press as an important part of hydro-forming machine is used to output the horizontal force to keep the high internal pressure during tube hydro-forming. However,the horizontal press frame is usually mounted on the press bed and not pre-stressed. Meanwhile it will be subjected to the reaction force caused by liquid pressure. Stresses are concentrated severely on the assemble region due to deformation,and total fatigue life will decrease. In order to predict the total fatigue life of the frame,the simulations are used firstly to determine to stress concentration region,and then strain gauge measurements are carried out under different loads. Next,the methods of statistical probability are conducted to calculate the fatigue life based on long-term load history. Finally a structure with the considerable longer fatigue life is redesigned.

摘要：稻蟹共生种养是全面推进我国特别是东北地区乡村振兴的特色产业,但养蟹稻田和常规稻田水分循环和水土环境特征究竟有何差异尚不清楚。为定量表征稻蟹共生种养模式水分循环和水土环境特征,在辽河入海口两处大型养蟹灌区(营口灌区和大洼灌区)布设12个典型田块,以常规稻田为对照,对养蟹稻田逐日蒸腾蒸发量、逐日渗漏量、灌溉定额、水体和表层土壤养分动态、养分淋失以及水稻和螃蟹产量等进行定量研究。结果表明:稻蟹共生模式对水稻产量无显著影响,但河蟹产值的增加,使得养蟹稻田综合经济效益比常规稻田显著提高38.89%~76.49%(P<0.05)。与常规稻田相比,养蟹稻田灌溉定额和渗漏总量分别显著增加3.29%~20.93%(P<0.05)和5.66%~10.83%(P<0.05),水分生产率显著降低1.85%~9.28%(P<0.05),但单位用水综合产值显著增加33.34%~70.23%。与常规稻田相比,养蟹稻田田面水NH_(4)^(+)-N、NO_(3)^(-)-N、速效磷和速效钾含量分别显著降低19.99%~37.24%、35.25%~56.22%、18.69%~20.30%和8.12%~9.36%(P<0.05),减轻了地表径流养分面源污染潜在风险。与常规稻田相比,养蟹稻田表层土壤NH_(4)^(+)-N、NO_(3)^(-)-N、速效磷和速效钾含量显著提高60.00%~83.88%、18.21%~44.97%、28.34%~54.56%和10.47%~21.24%(P<0.05),提升稻田土壤肥力。与常规稻田相比,养蟹稻田NH_(4)^(+)-N、NO_(3)^(-)-N、速效磷和速效钾淋溶损失量分别显著增加20.60%~25.20%、26.24%~44.75%、14.15%~18.83%和4.31%~16.94%(P<0.05),促进养分向深层剖面(20~100 cm)转移。本研究揭示了稻蟹共生系统具有提高单位用水综合产值、降低径流污染风险、提升地力和增加稻田综合经济效益等巨大潜力,但其促进稻田养分淋失的问题不容忽视。本研究可为养蟹灌区绿色可持续发展和农民增收致富提供理论依据和技术支撑。

摘要：本研究以磷酸氢钙(DCP)为参照物,以断奶仔猪生长性能、日粮消化率、血清和骨骼指标等为对象,评价高温烧结法饲用磷酸三钙(TCP)的相对生物学利用率。试验采用2×3因子完全随机试验设计,DCP和TCP各设3个磷添加水平,分别为0.08%、0.16%和0.24%,两种磷源共用一个基础日粮对照组。选择7~8周龄,体重、日龄相近的杜×长×大杂交断奶仔猪140头,按体重、性别、年龄一致的原则分为7个处理,每处理设4个重复,每重复5头猪。试验期共38 d,预试期3 d,正试期35 d。结果表明:磷源、磷添加水平及其交互作用对断奶仔猪生长性能无显著影响(P>0.05),磷添加水平显著影响仔猪对日粮钙、磷的表观消化率,胫骨和掌骨磷含量,股骨和掌骨断裂强度等指标,且呈现剂量效应(P<0.05),与DCP相比,TCP显著提高了仔猪表观可消化磷采食量、股骨断裂强度、掌骨磷含量等指标(P<0.05)。综合日粮钙、磷表观消化率,表观可消化磷,以及股骨和掌骨强度、掌骨钙和磷等敏感指标,以DCP生物学利用率为参考(100%),高温烧结法TCP的相对生物学利用率为109%。综上所述,断奶仔猪对高温烧结法TCP中磷的利用率优于DCP,有利于促进骨骼钙、磷沉积和增强骨骼强度。

摘要：Reaction runaway has longtime been an issue in chemical industry as it often leads to severe accidents if not controlled and inhibited *** we have reviewed several key considerations and procedures to prevent such phenomena,including inherently safer reactor design,thermal risk assessment and early warning detection of runaway,and pointed out that the basic principle underlying is necessary heat management and construction of resilient *** inherently safer reactor design,important factors such as heat removal,heat capacitance,flow behaviors and explosive behaviors have been *** survey shows that heat exchanger(HEX) reactor and microreactor outperform traditional ***,we have looked into the effect of thermal risk ranking and safety operation region determining for thermal risk assessment,and the influence of runaway criteria and construction methods for early detection of reaction runaway as *** shows that thermal risk assessment plays a key role on process design,and early warning detection system(EWDS) is preferable on prevention of reaction *** the end,perspectives regarding inherently safer designs with the measures discussed above have been provided.

摘要：时态知识图谱补全(Temporal Knowledge Graph Completion,TKGC)旨在依据已有的知识图谱,补全时态知识四元组中缺失的部分,其可以提高下游应用的性能,比如推荐系统、信息检索等。然而,目前的时态知识图谱补全方法主要针对实体补全或关系补全,忽略了时态知识图谱中重要的时间元素。这导致它们未能有效地同时解决实体补全、关系补全和时间戳补全的问题,从而限制了自然语言处理系统对于时态信息的准确理解和处理能力。为了解决此问题,提出了一种基于时间正交变换矩阵的时态知识图谱补全方法(Orthogonal Transformation Matrix-based TKGC,OTM)。具体来说,该模型包括两个阶段:时态实体关系嵌入以及评分函数。首先,第一阶段引入时间正交变换矩阵,利用正交矩阵的保范性学习时态感知的实体表示和关系表示。然后,第二阶段设计评分函数以评估时态知识四元组的合理性,并设计损失函数更新实体、关系和时间戳的向量表示。在广泛使用的YAGO和Wikidata数据集上进行了实体补全、关系补全和时间补全实验。实验结果表明了该模型在时态知识图谱补全的可行性和有效性。

摘要：依据《公路桥涵地基与基础设计规范》(JTG D63—2007)中计算传统重力式锚碇基础承载力时,仅考虑了基底摩擦效应,而不考虑底板嵌岩效应对承载力提升的作用,仅将其作为安全储备。为研究嵌岩效应对重力式锚碇承载性能影响,该文分别设计并开展1∶50大比例尺的无嵌岩与嵌岩重力式锚碇两组室内缩尺模型试验,探讨在竖向及水平向组合荷载下不同模型承载特性及荷载分配规律等,获得嵌岩效应的发挥效能。试验结果表明:在相同水平缆力作用下,考虑嵌岩效应的重力式锚碇变位更小,可将水平极限破坏荷载提高约16.7%;由于底板嵌入中风化层后,岩层与锚碇之间的黏结作用提供较大抗力,从而降低底板应力水平,并将重力式锚碇极限破坏状态由“滑移摩擦破坏模式”改变为“倾覆破坏模式”。该研究结果为现场重力式锚碇基础设计及施工提供了技术保障。

摘要：As system of a serial of technologies and engineering activities, remanufacturing aims at restoring and rebuilding waste machinery through advanced technologies and industrialized measures under the direction of the product total life cycle theory. With the development of surface engineering, nano-surface engineering has been one subject of intensive studies. In addition, nano-surface engineering has become an important means for property reforming and promoting of remanufacturing parts. Many low-dimension and nano-size or nano-structure functional coatings, which can improve materials properties evidently, are deposited by new methods. In this paper, some researches about the new achievement and remanufacturing application of the nano-stmctured coatings by different nano-surface engineering technologies in our laboratory were introduced. Especially, nano-structured DLC multilayer coatings by d.c. plasma CVD, nano-composed Al2O3/Ni, SiC/Ni and Diamond/Ni coatings by brush plating, and nano-composed Al2O3/TiO2 coating by plasma spraying were introduced in detail.

摘要：A well-designed redox-active organic linker,pyrazine-2,3,5,6-tetracarboxylate(H_4pztc)with brimming active sites for lithium ions storage was utilized to construct coordination polymers(CPs)via a facile hydrothermal *** two isostructural two-dimensional(2D)CPs,namely[M_2(pztc)(H_2O)_6]_n(M=Co for 1 and Ni for 2),delivered excellent reversible capacities and stable cycling performance as anodes in lithium ion *** demonstrated in electrochemical studies,1 and 2 can achieve highly reversible capacities of 815 and 536 mA h g^(-1)at 200 mA g^(-1)for 150 cycles,respectively,best performed for the reported2D-CP-based anode *** electrochemical mechanism studies showed that the remarkable performances can be ascribed to the synergistic Li-storage redox reactions of metal centers and organic *** work highlights the opportunities of using a well-designed organic ligand to construct low-dimensional CPs as new type of electrode materials for advanced lithium ion batteries.

摘要：为研究弧形坡道式出水箱涵内部流场流态,探究不良流态的优化方案,采用物理模型试验和数值模拟相结合的方法研究分析其内部水流流态,针对其不良出水流态,在压力箱涵内部设计两种不同的整流方案,并对箱涵内部的特征断面流态、流速及压强分布进行研究比较。研究表明:在原设计方案下,箱涵内部涵道间出现串流、进水前端出现回流等不良流态;同时,涵道内流量分配系数达到最高36.07%,最低只有8.73%,隔墩两侧的压强差最大达到354.90 Pa;采用“隔墩位置+挑流底板坡比优化”组合方案后,箱涵内部串流现象得到消除,箱涵进水前端回流部分消除,涵道流量分配系数最低降至20.23%,最接近理想流量分配;其余隔墩两侧压强差减小到35.15 Pa,整流效果显著,为以后类似泵站流态改善提供参考。