摘要：This essay designed a kind of new seven-core fiber with lower crosstalk and loss, and made space division multiplexing transmission experiment based on this seven-core fiber. It is known that crosstalk has the most serious influence in multicore fiber transmission process. Before the experiment, the affecting factors of fiber crosstalk were analyzed through simulation, such as core space, bending radius, and fiber length. Combined with the simulation analysis, the design scheme of multicore fiber with low crosstalk was obtained. Before the fiber design, various factors of influence crosstalk such as the core- to-core distance, bending radius, fiber length and so on. Based on the simulation analysis, conclusion has made on the design scheme of multi-core optimal fiber with low crosstalk. The space division multiplexing and wavelength division multiplexing technology, was adopted to conduct seven-core optical fiber transmission of *** crosstalk of adjacent core was suppressed to as low as 45dB / km, the attenuation of inner core was 0.24dB/ km, the outer cores＇ 0.32dB/km. Different bit error rate （BER） performances were also studied under different conditions, through reasonably designing the system to reduce the error rate, improve the performance of the system, and realize long distance and large capacity transmission with fiber.

摘要：文章旨在探讨大语言模型在智慧图书馆场景化服务中的应用研究,以理解和促进大语言模型在智慧图书馆的场景化服务模式及效能提升。首先,介绍了大语言模型的发展历程及功能作用;接着,阐述了大语言模型在促进图书馆嵌入智慧化的服务原理、丰富多元化的服务场景、提供高效化的服务方式、提升多语言的服务能力、建立弱边界的服务生态、化解模糊化的服务流程、扮演智能化的服务角色等方面的应用优势;最后,总结了大语言模型在智慧图书馆领域应用所面临的问题并提出相应对策。

摘要：为了满足社会生活对视频的需求分析和高速处理能力,提高生产效率,文章对基于广泛运用的ARM芯片和高效视频编码技术作为基础系统进行设计研究;文章本数据输入、数据存储、数据运算、数据输出多个方面来综合考虑系统的快速处理能力,分析可能存在的瓶颈和解决办法;对各个功能模块的分析寻找合适的快速处理框架,研究高效的编码处理算法,来整体提高系统的高速性;仿真结果显示,该图像处理算法具有快速处理能力,同时各个模块单元都达到的延时低的能力;因此研究可以得出基于ARM和高效处理算法的系统可以达到视频信息高速处理的能力,该系统能满足需求任务。

摘要：市域产教联合体是一种新的产教融合组织形态,对构建现代职业教育体系具有重要意义。但在建设过程中存在着政策机制不健全、保障措施不完善、统筹规划不到位、组织管理不统一、发展理念不先进、运行机制不顺畅的实然困境。对此,应通过提高多元主体建设强度、多元协调与实体嵌入、提升市域产教联合体运行活力、因地制宜与智改数转等方式,系统设计与统筹推进市域产教联合体建设。

摘要：This paper is mainly concerned with the model predictive control （MPC） of networked control systems （NCSs） with uncertain time delay and data packets disorder. The network-induced time delay is described as bounded and arbitrary process. For the usual state feedback controller, by considering all the possibilities of delays, an augmented state space model of the closed-loop system, which characterizes all the delay cases, is obtained. The stability conditions are given according to the Lyapunov method based on this augmented model. The stability property is inherited in MPC which explicitly considers the physical constraints. A numerical example is given to demonstrate the effectiveness of the proposed MPC.

摘要：为了解决合谋攻击防御下主动配电网受损率高的问题,提出通用逆扰动下的主动配电网合谋攻击防御模型。计算逆扰动深度网络模型的目标函数与通用逆扰动训练的损失函数,建立模型网络深度权重矩阵;利用深度梯度函数对攻击训练样本损失函数进行叠加求导,生成合谋攻击防御数学模型;利用最小网损期望的概念函数求解数学模型,完成主动配电网合谋攻击防御。实验结果表明,所设计模型对2 400个合谋攻击数据包的拦截防御时间都在10 ms以内,数据受损率低于0.5%,与传统模型相比,安全防御能力具有明显优势。

摘要：目的:为了评估呼吸机比例电磁阀的工作状态和性能特点,设计一种呼吸机比例电磁阀性能测试平台。方法:该平台硬件由高压气源、调压阀、传感器等零部件组成。软件基于PyQt5设计,由数据采集模块、参数设置模块、图像显示模块、指标计算模块、结果输出模块等组成。为验证该平台的测试性能,选取2种比例电磁阀(阀1、阀2)进行静态试验和动态试验。结果:该平台可以对比例电磁阀进行精确控制和数据采集,实现比例电磁阀实时且精确的静动态指标计算及传感器数据的时域和波形特征提取。静态试验结果表明,阀1的重复精度和回程误差更低,其性能稳定性更强、偏移更小,静态流量特性优于阀2;动态试验结果表明,阀2的流量变化迅速但有明显的流量波动冲击的现象,而阀1的动态响应变化更加平滑,总体上阀2的动态性能优于阀1。结论:该测试平台能全面、多角度地反映呼吸机比例电磁阀的性能特征和工作表现,对提升呼吸机的可靠性和安全性具有重要意义。

摘要：An adjustable ejector expansion device for a CO2 heat pump water heater (HPWP) is proposed to improve the system performance. It has been designed to investigate experimentally the effects of the motive nozzle throat area of the ejector, entrained flow pressure, back pressure and primary flow pressure on the entrainment ratio. Experiments based on different motive nozzle throat areas were conducted and the results of the prototype ejector using CO2 as working fluid are presented. The results show that an adjustable ejector can achieve high performance and work well in a wide range of working conditions.

摘要：目的:为提高含区间参数不确定性结构的可靠性,提供一种基于区间模型的不确定性结构的高效可靠性设计优化方法。创新点:1.提出结构性能指标区间可靠度的统一计算公式;2.提出区间可靠度违反度的概念和基于区间可靠度违反度的优于关系准则;3.提出并实现区间可靠性优化模型的高效直接智能求解算法。方法:1.借鉴图表法并克服其局限,给出计算区间可靠度的统一公式(公式2);2.利用Kriging近似模型和内层遗传算法计算结构性能指标在不确定性参数影响下的变化区间,从而计算出区间可靠性优化模型中各结构性能指标的区间可靠度及其违反度;3.基于区间可靠度违反度的优于关系准则,通过外层遗传算法实现各结构设计矢量的直接优劣排序和区间可靠性优化模型的直接智能求解;4.通过典型算例(图3和4、表2)和工程应用实例(图8和9、表7)验证所提方法的有效性和相比间接求解方法的优越性。结论:1.考虑结构性能指标可靠性要求的不确定性结构区间可靠性设计优化模型能够有效反映实际工程中提高不确定结构可靠性的需求;2.引入区间可靠度违反度的概念和基于可靠度违反度的优于关系准则,利用嵌套遗传算法和Kriging近似模型可实现不确定性结构区间可靠性优化模型的直接高效智能求解;3.提出的区间可靠性优化模型直接求解方法能比间接方法获得更优的解。

摘要：为某热风洞试验台设计了一种高温、高压蒸发型煤油燃烧加热器,根据热风洞试验台对加热器的性能要求,设计了加热器的主要部件,采用流阻法和一元流法,对加热器的空气流量分配及流程参数进行了计算.试验结果表明,所设计的加热器在结构方案、主要部件和总体性能方面基本满足设计要求,具有一定的适用性和工程实用价值.