摘要：p-Menthane type monoterpene derivatives were identified as bio-based compounds with high herbicidal activities. In order to search novel p-menthane type monoterpene derivatives in good performance, a series of novel cis-p-menthane type Schiff base derivatives were designed and synthesized. All target products were easily available novel compounds and characterized by FT-IR,^1H NMR,^13 C NMR and ESI＋-MS. Their pre-emergence herbicidal activities against annual ryegrass were evaluated. The bioassays indicated that most of the target compounds displayed excellent herbicidal activities in pre-emergence treatment.

摘要：Experimental study was carried out on the in-plane bending behavior of glass plates without lateral supports, and the effects of the factors, such as height-to-span ratio, on the stability of glass panels were studied. Results show that the in-plane bending glass plates with both ends simply supported and their upper edge free lose overall stability under loads, which belongs to the limit-point type of instability. It is found that the buckling load increases linearly with the increase of height-to-span ratio of the glass plates. The lateral stress of in-plane bending glass plates without lateral supports increases linearly under loads; while the large-area stress increases nonlinearly and the lateral stress is not the controlling factor of instability. In finite element analysis, the first buckling mode is regarded as the initial imperfection and imposed on the model as 1/1000 of the span of the components. The numerical buckling load according to the theory of large deflection is less than the experiment result, which is more conservative and can provide some reference for design. For the design method, when the in-plane load is imposed on the glass plate, its lateral strength and the deflection should be verified. Considering the stability of the in-plane bending glass plate without reliable lateral support, buckling is another possible failure mode and calls for verification.

摘要：点击率预测可以提高用户对所展示互联网广告的满意度,支持广告的有效投放,是针对用户进行广告的个性化推荐的重要依据.对于没有历史点击记录的用户,仍需对其推荐广告,预测所推荐广告的点击率.针对这类用户,以贝叶斯网这一重要的概率图模型,作为不同用户之间广告搜索行为的相似性及其不确定性的表示和推理框架,通过对用户搜索广告的历史记录进行统计计算,构建反映用户间相似关系的贝叶斯网,进而基于概率推理机制,定量度量没有历史点击记录的用户与存在历史点击记录的用户之间的相似性,从而预测没有历史点击记录的用户对广告的点击率,为广告推荐提供依据.通过建立在KDD Cup 2012-Track 2的Tencent CA训练数据集上的实验,测试了方法的有效性.

摘要：Covalent organic frameworks(COFs)are promising materials for converting solar energy into green ***,limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen evolution reaction(HER).In this study,the intrinsically tunable internal bond electric field(IBEF)at the imine bonds of COFs was manipulated to cooperate with the internal molecular electric field(IMEF)induced by the donor-acceptor(D-A)structure for an efficient *** aligned orientation of IBEF and IMEF resulted in a remarkable H_(2) evolution rate of 57.3 mmol·g^(-1)·h^(-1)on TNCA,which was approximately 520 times higher than that of TCNA(0.11 mmol·g^(-1)·h^(-1))with the opposing electric field *** superposition of the dual electric fields enables the IBEF to function as an accelerating field for electron transfer,kinetically facilitat-ing the migration of photogenerated electrons from D to ***,theoretical calculations indicate that the inhomogeneous charge distribution at the C and N atoms in TNCA not only pro-vides a strong driving force for carrier transfer but also effectively hinders the return of free elec-trons to the valence band,improving the utilization of *** strategy of fabricating dual electric fields in COFs offers a novel approach to designing photocatalysts for clean energy synthesis.

摘要：Photocatalytic solar fuel generation is currently a hot topic because of its potential for solving the energy crisis owing to its low cost and zero-carbon ***,the rapid bulk recombination of photoexcited carrier pairs is a fundamental *** resolve this problem,we synthesized a dual cocatalysts system of cobalt phosphide(Co P)and molybdenum carbide(Mo_(2)C)embedded on strontium titanate(Sr TiO_(3))*** with those of pristine SrTiO_(3) and binary samples,the dual cocatalysts system(denoted SCM)showed a significant improvement in the hydrogen evolution and CO_(2) reduction ***,the structure of SCM effectively promoted spatial charge separation and enhanced the photocatalytic *** addition,the Schottky junction formed between the SrTiO_(3) and cocatalysts enabled the rapid transfer of photoexcited electrons from SrTiO_(3) to the cocatalysts,resulting in effective separation and prolonged photoexcited electron *** electron migration route between SrTiO_(3) and the cocatalysts was determined by in situ irradiation X-ray spectroscopy,and band structures of Sr TiO_(3) and the cocatalysts are proposed based on results obtained from UV-vis diffraction reflection spectroscopy and ultraviolet photoelectron spectroscopy *** the basis of our results,the dual cocatalysts unambiguously boosts charge separation and enhances photocatalytic *** summary,we have investigated the flux of photoexcited electrons in a dual cocatalysts system and provided a theoretical basis and ideas for subsequent research.

摘要：针对工作环境已知的情况,研究了移动机器人的全局三维路径规划问题.首先改进蚁群算法全局信息素的更新策略和信息素增量的计算方法,使规划出的路径效果更优;接着引入安全性因素并提前离线计算,设计当蚂蚁陷入死锁时将该点信息素清零的回退机制,以实现复杂三维环境中机器人的高效避障;然后对传统搜索模式进行改进,实现机器人垂直于前进主方向的移动方式.仿真结果表明,采用文中设计的路径规划方法得到的三维路径长度短,搜索效率高,且更加符合实际情况.

摘要：文章基于信息多样化观点和社会认同理论对知识异质性影响团队创造力的不同解释,探讨了两种互补的团队共同信念——创意效能感和心理安全感对两者关系的调节作用。研究采用问卷调查方式,以194名企业员工为研究对象,采用层级回归的数据分析方法。结果发现:团队创意效能感调节知识异质性与团队创造力之间的关系;团队心理安全感也调节知识异质性与团队创造力之间的关系。

摘要：针对低gn值微惯性开关对微弹簧系统刚度的要求（0．1～1N／m数量级），设计了一种基于平面矩形螺旋梁结构的平面微弹簧。假设材料均匀、连续且具各向同性，根据材料力学的卡氏定理和线弹性理论，推导得到了微弹簧的弹性系数计算公式，并根据ANSYS有限元仿真分析结果对其进行了修正。基于多层高深宽比硅台阶刻蚀方法，采用MEMS体硅加工工艺，完成了微弹簧的制备，划片后微弹簧芯片尺寸为7mm×7mm×0．3mm。分析结果表明，完善后的弹性系数计算公式与ANSYS仿真结果更为接近，可直接应用于微弹簧的结构优化设计以简化设计过程。纳米压痕法的测试结果表明，微弹簧样品的弹性系数约为0．554N／m，满足设计要求。该微弹簧具有体积小、结构简单、加工容易实现等特点，其成功研制为实现低gn值微惯性开关的工程实用化奠定了基础。

摘要：首先,提出了一个新的分数阶混沌系统,通过对系统第二个等式的线性项x作绝对值运算,并分析了其唯一的参数k,该参数在一定区间内取值时可将混沌吸引子由两个翼的结构变换为四翼的拓扑结构,从而实现翼倍增.其次,分别采用Matlab和Multisim对新的分数阶系统及其翼倍增系统进行了数值模拟和电路仿真,电路仿真结果和数值模拟结果相一致.最后,基于滑模变结构控制理论和分数阶稳定性定理,为新的分数阶系统及其翼倍增系统设计了新的分数阶积分滑模控制器实现系统的同步,仿真结果和理论分析相一致,证实了所设计滑模控制器的有效性.

摘要：为在试验室条件下进行小容量的合成试验以节省调试同步控制系统的成本及方便调试同步控制系统,设计了一种合成回路试验的模拟系统。首先,在分析威尔合成试验和高压关合试验原理的基础上,计算主回路各个部分所采用的元件参数。然后根据合成试验的工作特点,设计试验回路的控制系统。利用单片机进行时序控制,得到符合要求的模拟系统。通过与同步控制系统的联调,得到电压回路的触发时间的误差<50μs,延弧回路的触发时间误差<40μs,可以保证合成试验的等效性,证明提出的模拟系统的可行性。