摘要：In the era of Big Data, typical architecture of distributed real-time stream processing systems is the combination of Flume, Kafka, and Storm. As a kind of distributed message system, Kafka has the characteristics of horizontal scalability and high throughput, which is manly deployed in many areas in order to address the problem of speed mismatch between message producers and consumers. When using Kafka, we need to quickly receive data sent by producers. In addition, we need to send data to consumers quickly. Therefore, the performance of Kafka is of critical importance to the performance of the whole stream processing system. In this paper, we propose the improved design of real-time stream processing systems, and focus on improving the Kafka's data loading *** use Kafka cat to transfer data from the source to Kafka topic directly, which can reduce the network transmission. We also utilize the memory file system to accelerate the process of data loading, which can address the bottleneck and performance problems caused by disk I/O. Extensive experiments are conducted to evaluate the performance, which show the superiority of our improved design.

摘要：功能与形式一直以来在设计界都备受争议,也是现代建筑的核心问题,二者的相互关系对建筑设计的影响广泛,而争议却是推动力本身。针对此,文章以现当代建筑设计为例,以设计批评的视角看待作品,站在多维方向对建筑作品进行比较和分析,辩证统一地看待建筑设计中功能与形式的问题,探究建筑形式与功能的生成逻辑和未来发展趋势。

摘要：Drought can greatly impact the biodiversity of an ecosystem and play a crucial role in regulating its ***,the specific mechanisms by which drought mediate the biodiversity effect(BE)on community biomass in above-and belowground through functional traits remain poorly ***,we conducted a common garden experiment in a greenhouse,which included two plant species richness levels and two water addition levels,to analyze the effects of biodiversity on aboveground biomass(AGB),belowground biomass(BGB)and total biomass(TB),and to quantify the relationship between BEs and functional traits under drought *** analysis focused on partitioning BEs into above-and belowground complementarity effect(CE)and selection effect(SE)at the species level,which allowed us to better understand the impacts of biodiversity on community biomass and the underlying *** results showed that plant species richness stimulated AGB,BGB and TB through *** decreased AGB,BGB and TB,*** addition,the aboveground CE was positively associated with the variation in plant *** in above-and belowground were negatively correlated with the community mean plant height and root length,***,drought weakened the aboveground CE by decreasing variation in plant height,resulting in a reduction in AGB and *** findings demonstrate that the complementarity of species is an important regulator of community biomass in above-and belowground,the dynamics of biomass under environmental stress are associated with the response of sensitive compartments.

摘要：为提升工业机器人在复杂作业环境中的灵活性与适应性,设计了一种新的柔性夹具机构。首先,设计总体结构。其次,探讨材料选择与结构优化,以确保夹具的强度与耐用性。再次,在指令设计方面设计运动指令、输入/输出(Input/Output,I/O)指令以及等待指令,以精准控制柔性夹具。最后,实际应用表明,设计的柔性夹具机构具有一定的实用性与有效性,可为工业机器人夹具设计与改进提供有益思路与借鉴。

摘要：自主空中加油技术对于提高无人机(UAV)续航能力,扩大作战半径,增加载荷重量以及提升战略部署等方面有着重要的意义,是未来智能集群无人机系统的必备技术。本文以“无人争锋(UI-STRIVE)”空中握手比赛为背景,对固定翼集群无人机空中模拟对接相关技术及策略进行了研究。首先,针对固定翼集群无人机飞行速度快、编队密集程度高等特点,设计了集群无人机空中对接流程以及基于Dubins路径规划的时间最短的追机方案,并采用非线性制导律进行航路跟踪;其次,基于模拟锥套的先验信息设计了一组弱分类器,并通过级联的方式实现对模拟锥套的快速检测;然后,设计了沿加油机航线方向进行精确对接的策略,并结合无人机姿态先验以及模拟锥套尺寸信息推导了精确对接阶段制导参数解算方法;最后,设计了相应的固定翼集群无人机系统,并以4机编队参加了第2021届“无人争锋”空中握手比赛,参赛结果验证了本文所提出固定翼集群无人机系统以及其技术和策略的可行性。

摘要：针对现有带式输送机恒速运行效率低的问题,开展了智能控制系统设计,完成了智能控制系统整体结构、硬件系统和软件系统的设计,应用结果表明,系统能够稳定可靠运行,实现节能高效运行。统计结果显示,智能控制系统的应用能够节约煤炭企业23%的电能消耗,降低煤炭生产成本,具有很好的应用前景。

摘要：目前现有的大部分方法对细粒度遥感船只检测识别精度较低，并且星载计算机算力有限，常用的浮点精度数据类型所带来的大量计算和存储需求使其难以满足模型在轨部署的需求。面向这些挑战，提出了一种基于模型量化的细粒度遥感船只快速目标检测方法。首先设计了一种基于融合智能的检测网络，解决了“类内差异大、类间差异小”的难题，可有效提高细粒度船只检测识别的准确度。在此基础上，进一步提出了一种高精度的模型量化方法对裁剪边界实现了优化，可有效提升在轨遥感图像检测识别速度。在多个数据集上的测试表明，所提出检测方法相比于现有研究实现了超过5.9%的最大精度提升，同时量化方法可实现1.2%的最大性能提升，可在降低模型计算量的同时保持较高的精度，可适用于星载计算机的应用。

摘要：This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction ***,we prepare a single crystal metal‐organic framework(MOF),employing the ZIF‐67 structure as a proof of concept,which is constructed by vertically self‐pillared nanosheets(VSP‐MOF).We further converted VSP‐MOF into VSP‐cobalt sulfide(VSP‐CoS2)through a sulfidation *** plays an important role in almost all battery technologies;for metallic batteries,lithium anodes exhibit a high theoretical specific capacity,low density,and low redox ***,during the half‐cell reaction(Li++e=Li),uncontrolled dendritic Li penetrates the separator and solid electrolyte interphase *** employed as a composite scaffold for lithium metal deposition,there are many advantage to using this framework:1)the VSP‐CoS2 substrate provides a high specific surface area to dissipate the ion flux and mass transfer and acts as a pre‐catalyst,2)the catalytic Co center favors the charge transfer process and preferentially binds the Li+with the enhanced electrical fields,and 3)the VSP structure guides the metallic propagation along the nanosheet 2D orientation without the protrusive *** these features enable the VSP structure in metallic batteries with encouraging performances.

摘要：原生质体是遗传转化和基因功能验证的重要受体。百合(Lilium)是世界上重要的观赏、食用和药用植物,其原生质体分离培养体系仍不完善。本文以细叶百合(Lilium pumilum)和新铁炮百合(Lilium formosanum×Lilium longiflorum var. scabrum)为材料,对百合原生质体分离培养和瞬时转化进行了深入探索。结果表明:百合叶片和胚性愈伤组织均是分离原生质体的优良材料。试管苗叶片原生质体的最佳分离液为细胞原生质体清洗液(cell protoplast wash medium, CPW)+1.0%~2.0%纤维素酶RS+0.5%离析酶R-10+0.10%果胶酶Y-23+12~14 g/L D-甘露醇。胚性愈伤组织原生质体分离的最佳分离液为CPW+2.0%纤维素酶RS+0.60%果胶酶Y-23+12~14 g/L D-甘露醇。叶片原生质体是瞬时转化的优良受体,瞬时转效率为34.0%~36.7%。新铁炮百合胚性愈伤组织原生质体具有很强的分裂能力,在MS(Murashige-Skoog,含206.25 mg/L NH_(4)NO_(3))+60 g/L葡萄糖的固-液双层培养基中及培养密度为2×10^(5)个/mL条件下,培养70 d可形成愈伤组织。本研究为百合细胞工程和分子育种奠定了基础。

摘要：针对具有时变时滞的半马尔科夫神经网络静态输出反馈主从同步的问题,设计1种静态输出反馈控制器,以实现半马尔科夫神经网络从系统在时变时滞的影响下与主系统同步。利用半马尔科夫切换过程对时变时滞神经网络系统建模,表征神经网络系统参数的突变现象,比起马尔科夫过程,半马尔科夫过程更具一般性;考虑到系统状态不能完全获得的情况,利用输出信息实现神经网络之间的同步;利用李雅普诺夫(Lyapunov)稳定性理论,选取时滞相关的Lyapunov泛函并结合积分不等式缩放技术,得到低保守性的充分条件;在没有控制器输入矩阵的情况下,采用自由权矩阵技术将系统矩阵从Lyapunov泛函广义矩阵中分离,克服固定权矩阵的保守性;最后通过1个数值算例验证控制器设计的有效性。结果表明:设计的控制器可使时变时滞系统在初始状态与主系统不同步时,依然可在5 s后消除误差实现同步;控制信号在消除误差后趋向稳定,在保证同步误差系统随机均方稳定的同时满足混合无穷/无源性能指标,证明了设计的合理性。