Classic Chinese poems developed with time and reached ultimate prosperity in the Qing Dynasty,when the number of poets could have amounted to one hundred thousand,several times of the total number of poets from all previous dynasties combined.However,only a few of their years of birth and death can be readily ascer-tained.This will become a big problem in the future when compiling books like"A Collection of Poems in the Qing Dynasty"and many other poetry documents.Therefore,in addition to the existing reference books in this field,it is highly necessary to supplement and examine the birth and death years of poets in the Qing Dynasty based on various original materials.The paper tries to provide some supplementary records to seven poets among them,including Mei Yue and Li Zhonghuang in Hubei,Zhang Maozhong and Lady Zhong(Xu Jun's wife)from Haining,Gao Xianke from Henan,Liu Shicong from Shandong,Li Fengcai from Yunnan,and Yi Zhenji from Jiangsu.
Path planning research can effectively solve the problem of finding free parking space in multi-storey parking lots. This paper takes advantage of the decision ability of reinforcement learning and the perception ability of deep learning to improve the algorithm based on traditional DQN. On the one hand, Q value is updated with qualification trace; On the other hand, different loss functions are set for the main network and the target network, and the two are combined to improve the accuracy of path planning. The experimental results show that the improved DQN model can accomplish the path planning task of multi-storey parking lot more accurately and efficiently.
利用有限元软件ANSYS建立了三维成层土体模型,分别进行了在EL-Centro波作用下土体的线性、等效线性化和非线性地震响应分析,其中采用了Extended Drucker-Prager模型模拟土体的非线性特征.通过对不同模型在多遇地震、设防地震和罕遇地震作用下计算结果的对比分析,得到如下结论:(1)当土体埋深较大时土的非线性影响不够明显,线性、非线性及等效线性化计算结果相差较小.随着埋深变浅和地震动强度的增大,三者出现显著的差异.(2)考虑土体非线性后,随着埋深变浅和输入地震动强度的增加,加速度峰值表现为线性条件大于非线性条件,非线性条件大于等效线性化条件.(3)随着埋深变浅和输入地震动强度的增加,考虑土体非线性时模量衰减,刚度和频率降低.在地震动输入较大时,由于等效线性化过高估计了场地土的非线性特性导致其高频部分快速降低.
钢板外包混凝土组合剪力墙(C-PSW/CE)由钢板和外包在钢板两侧或一侧的混凝土板组成,两者通过栓钉形成整体,栓钉可协调两者在平面内外的变形,针对C-PSW/CE栓钉剪力需求的研究较少.利用有限元模拟结果,分析了2％层间侧移内强度劣化低于15％的钢板单面外包混凝土C-PSW/CE各组件在循环荷载下的响应.分析了钢板厚度、混凝土板厚度、栓钉间距、栓钉直径及墙板高宽比对栓钉剪力的影响.在钢板弹性阶段,单个栓钉的最大剪力受栓钉间距、混凝土板厚的影响较小;当栓钉间距不变时,随着栓钉直径或钢板厚度的增大,栓钉最大剪力增大;单个栓钉最大剪力与墙板高宽比关联较大.根据36个算例的有限元模拟结果,提出了强震下钢板单面外包混凝土 C-PSW/CE栓钉剪力需求预估公式.
为了预测桥梁未来状态,考虑奇异谱分析(SSA)和季节性差分自回归滑动平均(SARIMA)模型的特点,提出将二者结合以实现优势互补.利用SSA提取数据中的趋势项、季节项及高频项;采用SSA和SARIMA模型对每项分别进行预测,以选出最优方案重组并验证该方法的有效性;最后,将该方法与SSA和SARIMA模型进行比较,结果表明SSA-SARIMA的组合模型对预测结果的精度有明显的提高.用该方法对实桥数据进行了处理分析,取得了较好的效果.
