摘要：公路桥梁工程在交通工程中占据重要地位。但是,从公路桥梁的设计、施工到使用运营的整个过程中,受多种因素的影响,公路桥梁会产生许多结构性或非结构性的损坏,这些损坏可能导致公路桥梁无法继续使用,因此,防止缺陷扩大、对公路桥梁进行修复加固,以满足其继续使用的承载力及刚度要求显得尤其重要。基于此,本文首先分析公路桥梁的常见病害及受损原因,然后探讨公路桥梁的修复技术和加固技术。

摘要：目的:探讨3种不同问诊对象在病史采集实验课教学中的应用效果,为进一步改进教学方法提供依据。方法:2022年3月选取贵州医科大学2019级口腔医学专业的183名学生为研究对象,采用随机数字表法将其分为3组,分别对应以患者作为问诊对象的真实患者(real patient,RP)组、以学生作为问诊对象的学生标准化病人(standardized patient,SP)组和以教师作为问诊对象的教师SP组,病史采集实验课教学后对3组学生进行病史采集和病历书写考核,采用单因素方差分析和卡方检验比较组间差异。结果:3组学生的病史采集理论考核成绩由高到低依次为教师SP组[(81.07±3.66)分]、学生SP组[(79.51±4.25)分]和RP组[(77.62±5.21)分],其差异具有统计学意义( F=9.27, P<0.001),病历书写成绩由高到低依次为RP组[(75.62±7.19)分]、教师SP组[(75.49±6.65)分]和学生SP组[(74.39±6.04)分],其差异无统计学意义( F=0.63, P=0.534)。 结论:在病史采集训练中,不同问诊对象学生获益不同。在进行病史采集教案设计时,可以根据需求选择相应的对象。

摘要：Since sulfonylurea is one of the most potent acetohydroxyacid synthase（AHAS） inhibitors, a series of novel sulfonylureas containing an oxime ether moiety was designed and synthesized and their chemical structures were determined by means of 1H nuclear magnetic resonance（NMR）, 13C NMR and high-resolution mass spectrometry（HRMS）. In the herbicidal bioassay, several compounds showed moderate to good herbicidal activities against dicotyledons, but their activities against monocotyledons decreased. The in vitro antifungal activity was tested at a dosage of 50 mg/L. And the results show that compounds 71, 7m and 7n exhibit promising antifungal activities against six common plant pathogenic fungi. Further investigations on molecular modification are in progress.

摘要：随着技术进步和社会经济发展,出现了一种高度依赖于地区创意能力的"发展的创意模式"。通过剖析地区的创意生产过程,提出地区创意生产系统及其特征,并借鉴波特的菱形构架理论提出了地区创意力决定的六要素模型。通过系统论述"发展的创意模式",为创意社会条件下我国城市与区域发展提供理论支撑和政策建议。

摘要：Anthranilic diamides are one of the most important classes of modern agrochemical insecticides. To discover new structures with higher activity, lower toxicity and lower residue, a series of novel anthranilic diamides containing dihydroisoxazoline and isoxazole was designed and synthesized. Their structures were characterized by means of melting points, proton nuclear magnetic resonance（IH NMR）, 13C NMR and high resolution mass spectrometry（HRMS）. According to the bioassay data, it was found that some of the title compounds exhibit moderate insecticidal activity and good antifungal activity. In particularly, compound 15b with a concentration of 50 mg/L shows a lethality rate of 60.0% against Mythimna separata Walker and a lethality rate of 50.0% against Culex pipiens pallens with a concentration of 1 mg/L. Moreover, compound 15b showed good antifungal activities（58.8%, 77.1%, 70.7%, 55.3%, 60.7%, 65.4%） when against all the tested fungi（Cercospora araehidicola tIori, Physalospora piricola, Rhizoctonia cerealis, Bipolaris maydis, Watermelon anthracnose, Fusarium moniliforme）. The effects of compounds 14h, 14j and 15b on the concentration of intracellular calcium ion（[Ca2＋]i） in the central neurons of Mythimna separate Walker were well investigated via calcium imaging technique. The results demonstrate that the novel compounds can elevate the calcium concentration in the neurons, denoting that some new structures are potential modulators of the insect ryanodine receptor（RyR）.

摘要：High-power fiber lasers have experienced a dramatic development over the last *** increasing the output power needs an upscaling of the fiber mode area,while maintaining a single-mode ***,we propose an all-solid anti-resonant fiber(ARF)structure,which ensures single-mode operation in broadband by resonantly coupling higherorder modes into the cladding.A series of fibers with core sizes ranging from 40 to 100µm are proposed exhibiting maximum mode area exceeding 5000µ*** simulations show this resonant coupling scheme provides a higher-order mode(mainly TE01,TM01,and HE21)suppression ratio of more than 20 dB,while keeping the fundamental mode loss lower than 1 dB/*** proposed structure also exhibits high tolerance for core index depression.

摘要：设计了一种基于仿生原理的爬壁蠕虫机器人,分析了这种机器人的结构,并利用仿生学原理设计了基于三角波和梯形波特点的两种运动步态.在分析现有神经中枢控制CPG(Central Pattern Generator)算法基础上,应用循环抑制CPG模型和相互抑制CPG模型,构建了爬壁蠕虫机器人的三角波步态CPG控制网络和梯形波步态CPG控制网络,并结合吸盘状态,加入反馈信号,实现了带有反馈的CPG控制算法.利用爬壁蠕虫机器人模型,仿真验证了这种控制算法对蠕动运动步态控制的有效性,通过在爬壁蠕虫机器人原理样机上的步态实验,证明了该算法的可行性.

摘要：直线发电机是斯特林热电机组的核心部件,为改进现有太阳能碟式斯特林发电机存在的功率密度小、铁磁材料利用率低等缺点,提出复合永磁直线发电机设计方案。由于磁场调制作用,在电机动子低速运动的情况下,在定子侧仍然可以得到幅值和频率相对较高的感应电动势。该电机整体采用平板式拓扑结构,外定子与磁场调制变速模块以平行并列结构同轴集成,可以降低加工难度。高速和低速动子永磁体均采用Halbach充磁方式并形成聚磁回路,在提高电机电动势基波幅值的同时降低谐波含量。另外,在高速动子侧引入阻尼环,有效抑制斯特林机因推力波动造成的机械振荡问题。通过建立电机等效磁路模型,分析电机在不同位移点的磁动势和磁导函数,为参数优化设计提供依据。根据设计方案制造了样机,实验测试与计算结果基本一致,验证了设计方案的正确性。

摘要：Cobalt disulfide(CoS_(2))has been considered a promising anode material for lithium-ion batteries(LIBs)due to its high theoretical capacity of 870 mA h g^(-1).However,its practical applications have been hampered by undesirable cycle life and rate performance due to the volume change and deterioration of electronic conductivity during the dischargecharge *** this study,an interconnected CoS_(2)/N-doped carbon/carbon nanotube(CoS_(2)/NC-CNTs-700)network was successfully prepared to boost its lithium storage performance,in which small-size CoS_(2)nanoparticles were confined by N-doped carbon and uniformly decorated on the surface of CNTs.N-doped carbon can effectively accommodate the large volume expansion of CoS_(2)***,the 3D conductive nanostructure design offers adequate electrical/mass transport *** from this,the CoS_(2)/NCCNTs-700 electrode demonstrates a long cycle life(a residual capacity of 719 mA h g^(-1)after 100 cycles at 0.2 A g^(-1))and outstanding rate performance(335 mA hg^(-1)at 5.0 A g^(-1)).This study broadens the design and application of CoS_(2)and fosters the advances in battery anode research.

摘要：针对麦克纳姆全向轮驱动的移动机器人轨迹跟踪控制问题,设计了一种自适应滑模控制器。将自适应鲁棒控制应用于麦克纳姆轮驱动的移动机器人轨迹跟踪以获得良好的动态跟踪性能以及鲁棒性能。首先对基于麦克纳姆轮的移动机器人进行了运动学建模,在此基础上进行了自适应鲁棒控制器设计。提出了一种比例-积分-微分(PID)形式的滑模面,满足了系统的鲁棒性要求;设计了一种能够快速收敛的趋近律,减少了整定参数所消耗的时间并能有效抵抗外部扰动。最后,存在脉冲扰动以及正弦信号扰动条件下对控制器进行了仿真验证,证明了所提控制器的优越性,通过轨迹跟踪控制的样机试验,证明了该方法的实用性和可靠性。