基于Spring MVC的化橘红病虫害防治技术数据库系统的设计

文章设计了化橘红病虫害防治技术数据库系统,并详细分析了设计流程。系统界面设计友好,操作便捷,收集了与化橘红相关的病虫害信息及防治方法,能够为果农提供参考,具有一定的应用价值。

基于Spring Boot的高压开关柜远程监控系统的设计

针对现代工业生产对产品信息传递的方便性,以及远程控制装置与计算机技术有机融合的需求,分析了技术选型和应具备的功能,设计了系统的结构和功能单元,开发了一套基于Spring Boot和Vue框架的高压开关柜远程监控系统。该系统可以实现生产信息的实时监测,具备各项生产数据的查询、汇总和分析功能,系统界面友好,整体逻辑清晰,操作简单。

Forming condition and control strategy of ferrite decarburization in 60Si2MnA spring steel wires for automotive suspensions

The ferrite decarburization behavior of 60Si2MnA spring steel wires for automotive suspensions, including the forming condition and the influence of heating time and cooling rate after hot rolling, was investigated comprehensively. Also, a control strategy during the reheating process and cooling process after rolling was put forward to protect against ferrite decarburization. The results show that ferrite decarburization, which has the strong temperature dependence due to phase transformation, is produced between 675 and 875°C. The maximum depth is found at 750°C. Heating time and cooling rate after rolling have an important influence on decarburization. Reasonable preheating temperature in the billet reheating process and austenitizing temperature in the heat-treatment process are suggested to protect against ferrite decarburization.

A Hybrid Structure of Dual Stators and a Pneumatic Spring for Resonance Control in an Air Mount

An active device using electromagnetic forces was constructed and examined for the purpose of minimizing the resonance in air mounts of clean rooms. The air mounts are vulnerable to low-frequency resonance due to heavy weight and low stiffness. A hybrid structure of the active device, composed of pneumatic and electromagnetic parts, was developed and tested. The pneumatic parts in the device support heavy weights under the air mounts, and the electromagnetic parts reduce the resonance. The electromagnetic parts are composed of dual stators and an armature, which surround the pneumatic parts. The resonance can decrease when electromagnetic forces are generated in the gaps between the stators and the armature. Four active devices were installed under a 3-ton surface plate for a vibration test apparatus. The vibration was detected by eddy-current sensors. Discrete P Control logic was based on displacement, and embedded in a C6713 DSP. The results from impact tests show that the peak magnitude in the resonance frequency can be reduced to –10 dB.

基于Spring Boot的自动化测试控制系统

本文介绍了一种基于Spring Boot框架的自动化测试控制方法,该方法被应用于实验室等复杂环境下自动化测试控制系统。经实际使用可以论证,该方法除了能够完成基本的自动化测试任务执行外,还具备满足个性化需求、开发成本低、容易部署和维护等优势。

Spring Wheat Response to Disease Control and Subsurface Drainage Management in the Red River of the North Valley, USA

Increased variability in rainfall events and high production input costs are driving agricultural producers to consider subsurface water management in the flat Red River of the North Valley in Eastern North Dakota and Northwestern Minnesota, USA. Subsurface tile incorporated with water table control structures was utilized from 2009 to 2011 to investigate the response of hard red spring wheat (HRSW) (Triticum aestivum L. emend. Thell.) for yield, disease, and other agronomic characteristics to soil water management. A factorial arrangement of four cultivars, two seed treatments, and two foliar fungicide treatments in a split-plot design with closed and open tile as whole-plots was used. Mean wheat yields averaged across years were not significantly different with closed or open tile treatments. There existed an optimum management practice where plant useable water was not freely drained and analyzing the data with the optimum water management for each year found the optimum water table managed treatment yielded higher with 3812 kg ha-1 compared with limited water table management with 3679 kg ha-1. In 2011, the cultivars Faller and Howard were taller, and Traverse had lower root disease severity. In 2010 and 2011, Howard and Traverse had more leaf disease with open tile compared with closed tile. Across years, there was no difference in root disease, stand, number of spikes, crop height, or yield response to appli-cation of seed treatments with open or closed tile. In 2010, there was a 3.7% yield advantage with application of seed treatment on open tile. Across years, there was no yield response to application of foliar fungicides;however, wheat yield with foliar fungicide was 5% higher than without application in 2010. Producers should be using water table control and disease management to maximize HRSW yield. Further research should investigate water table management throughout the season based on weather conditions.

Theory and Practice of Oxide Inclusion Composition and Morphology Control in Spring Steel Production

In order to control the composition,morphology and size distribution of oxide inclusions in spring steel,the relationship between the content or activity of aluminum and calcium in molten steel and compositions of oxide inclusion precipitated at different temperatures was determined based on thermodynamic equilibrium for spring steel 60Si2 MnA,and has been verified by practice.The size distribution of non-metallic inclusions electrolytically extracted from specimens of hot rolled spring steel was determined by image analyzer.The results show that there are a great deal of large inclusions in spring steel produced by the conventional process,and the quantity and the size of large inclusions in spring steel produced by new process are largely reduced.As a result,the fatigue properties of the spring steel produced by new process are highly improved,and the ratio ofσ-1/σbis raised from 0.451 to 0.468.

Application of Elastic Stiffness Damper with Disc Spring to Numerical Control Punch

The paper aims to analyze the impacts of punch damper stiffness on equipment base and vibration, andintroduce the development and application of a disc spring damper featured hard-soft-hard variable stiffness. Adamper has four damping columns with C-type disc springs whose laminates plate number gradually increases setby set. Compared with its counterparts, this kind of dampers has the advantages of high energy absorption andvibration damping effect, which not only can effectively reduce the vibration of the foundation of punch press,but also prevents the vibration range from increasing. Also, this kind of dampers is of low cost and convenient touse.

形状记忆合金驱动的人工逼尿肌系统

针对神经源性、肌源性膀胱缺乏有效治疗手段的现状,从工程学角度提出了一种新的解决方案——人工逼尿肌系统。基于形状记忆合金(SMA)弹簧的形状记忆效应,设计了由无线能量传输模块、控制模块、反馈模块和执行模块组成的系统结构,旨在实现符合人体尿动力学规律的辅助排尿。文中首先建立了人体膀胱的有限元模型,仿真分析了人体膀胱的储尿和辅助排尿过程,在仿真结果的基础上结合SMA弹簧的数学模型,对SMA弹簧致动器的结构参数进行了优化设计;其次,结合实验数据推导了SMA弹簧温度-自由高度方程;然后,结合热力学公式和弹簧数学模型推导了系统控制方程,并在此基础上提出了系统开环控制策略;最后,基于系统的反馈模块,设计了比例积分微分(PID)闭环控制策略,并搭建模拟实验平台研究了系统的尿流率特性。结果表明:系统原理可行,辅助排尿过程连续可控,在应对不同尿液容量时两种控制策略均能实现符合人体尿动力学规律的辅助排尿。文中结果可为设计适用于临床的人工逼尿肌系统提供指导,也可为其他以SMA弹簧作为致动器的植入装置的设计提供借鉴和参考。

空气弹簧自由边界模拟控制策略研究

针对空气弹簧水平多点支撑自由边界模拟系统存在的过约束、难收敛和非线性控制问题,首先,采用自由度解耦控制方式,在削弱系统内力的基础上,将空间自由度的控制目标分解为每一个控制通道的控制目标,解决了系统过约束问题;其次,利用改进积分分离(proportion integration differentiation,简称PID)控制算法克服系统超调,解决了系统震荡收敛问题;最后,采用经验数据对空气弹簧刚度进行实时二维插值补偿,解决了系统非线性问题。实测结果表明,该控制系统设计合理,系统运行过程平稳,通道间同步性较好,控制策略满足模态试验边界的模拟要求。

基于Spring MVC架构的体育远程互动教学系统

为了解决现有系统存在互动延迟的问题,提出了基于Spring模型、视图、控制器(Model View Controller,MVC)架构的体育远程互动教学系统。首先,对数据进行去干扰处理,设计互动教学数据库。其次,在数据库的基础上,基于Spring MVC架构设计体育远程教学互动系统。最后,通过互动响应时间测试系统性能。实验结果表明,设计系统的响应时间较短,可有效减少教学过程互动延迟情况的发生,实现体育远程教学的有效互动。

基于模型预测的直流微网多电力弹簧协同控制策略研究

针对新能源接入、负荷投切所导致的直流微电网电压质量下降与系统呈现低惯性的问题,传统惯性控制随着电网规模的扩大适应性降低,因此提出一种多直流电力弹簧(DC electric springs,DCESs)单元下的直流微网电压协同控制策略,首先采用分布式一致性算法通过稀疏通信网络交换本地信息与相邻信息,求解全局母线电压平均值,并引入积分环节提高传统通信方式的收敛性。接着考虑系统负荷投切以及源侧功率波动导致的电压突变,基于DCES中的双向全桥DC/DC变换器构建预测模型,令各DCES根据系统功率波动状态自适应求解最佳虚拟电容值,平滑直流母线电压,提升了动态响应速度,同时分析了系统电压的收敛性与稳定性。最后通过MATLAB/Simulink在随机波动负荷、实际光伏场景下从电压质量、即插即用性能、系统惯性3个方面验证了模型的有效性,所提出的控制策略在保证系统电压平稳的同时,具有更优的动态响应能力。

基于Spring的MVC框架设计与实现

为构建高效、灵活且易于使用的模型-视图-控制器(MVC)模式实现机制,提出一种基于Spring框架的MVC框架。该框架使用JSP技术构建视图层,采用总体控制与局部控制相结合的方法增强控制层的功能,采用O/RMapping类完成数据访问操作。基于IOC/AOP技术实现事务管理,并应用该框架开发网络收藏夹。

带有指令滤波的电力弹簧系统反步控制

针对新能源发电系统因间接性和不确定性导致的电压波动问题,文中首次将反步控制策略应用于电力弹簧(electric spring,ES)系统,并提出一种带有指令滤波的ES反步控制策略。根据ES的数学模型利用反步法设计控制器,并加入指令滤波器,以解决ES反步控制中的计算膨胀问题,同时设计误差补偿信号,并利用Lyapunov稳定性理论验证系统稳定性。通过仿真模拟新能源发电系统网侧电压波动时,ES对关键负载(critical load,CL)电压稳定的效果,以及不同系统参数对文中控制策略的敏感性分析。与传统的比例积分(proportional-integral,PI)控制对比,CL电压动态响应速度提高0.07 s,CL电压畸变率降低31%,参数敏感性分析中CL电压最大偏差率为0.318%,能承受的最大电压幅值波动范围提高52.9 V。仿真结果验证了文中所提出的控制策略具有响应速度快、谐波含量低、抗干扰能力强的优势。

减氮和控释肥替代对宁夏引黄灌区玉米产量及土壤无机氮的影响

为研究不同施氮模式对宁夏引黄灌区春玉米产量及土壤无机氮变化的影响,以玉米为研究对象,采用完全随机设计,设置不施氮肥处理(CK)、农民常规尿素处理(CF,N 450 kg·hm^(-2))、等量控释肥替代处理(T1,N 450 kg·hm^(-2))、常规减氮处理(T2,N 315 kg·hm^(-2))和减氮控释配施处理(T3,N 315 kg·hm^(-2))5个处理,分析减氮及控释肥处理下玉米产量及土壤无机氮状况。结果表明:连续两年(2021—2022年)减氮和控释施肥处理中,T3处理年均增产效果最显著,且产量构成因子中年均百粒质量和穗粒质量分别显著提高11.83%和28.94%,年均秃尖长显著降低67.87%。不同减氮和控释施肥处理两年均对0~120 cm土壤中NH+4-N的影响不显著,但对土壤NO-3-N和总无机氮的影响显著。收获期,T3处理的NO-3-N和无机氮的平均累积量最低,分别为210.01 kg·hm^(-2)和298.40 kg·hm^(-2)。连续两年减氮和控释施肥结果显示,T3处理较CF处理氮肥回收利用率、氮肥农学效率和氮肥偏生产力分别平均显著提高21.93%、10.42 kg·kg^(-1)和21.89 kg·kg^(-1)。研究表明,总施氮量315 kg·hm^(-2)的减氮控释肥配施(T3)方式,是宁夏引黄灌区春玉米在兼顾生态环境效益和经济效益下的最优施肥模式。

基于内部控制的办公自动化系统设计与研究

内部控制是现代企业管理的有效工具,但因其涉及面广且要求具体,线下实施管理成本较高。办公自动化系统(简称OA系统)已经广泛应用于企业管理中,OA系统与内部控制结合有助于内部控制落地实施、提升管理效率、构建企业协同管理体系。从系统架构设计、系统功能设计、数据库表设计三个方面阐述了基于内部控制的OA系统研发思路,并结合内部控制思想对系统各功能模块进行了详细描述。

基于Spring MVC框架的Web研究与应用

MVC是软件工程中的一种经典软件架构模式。文章在分析MVC架构基本组成和原理的基础上,详细介绍了Spring MVC架构的组成原理、应用配置;最后,以一个应用案例,详细说明了Web请求在SpringMVC框架中的流转生命周期。

机械网络运动方程与构网型VSG惯量阻尼的比较

随着新能源和电力电子设备的广泛应用,新型电力系统面临着多方面的不稳定性挑战。为了克服这些挑战,采用构网型(grid-forming,GFM)控制技术,可以通过电压支撑和主动惯量调节替代同步机,以确保电力系统的稳定性。但构网型变流器自身的惯量阻尼机理尚不明确,其阻尼系数往往被忽略。该文从机械系统的运动方程出发,首先通过推导质量-弹簧系统的运动方程和构网型虚拟同步机控制方程本质上都是二阶微分方程;然后,通过实验仿真验证了机械网络和电气网络的惯量阻尼机理的一致性;最后,通过Matlab/Simulink仿真在IEEE 39节点系统中验证构网型VSG的阻尼系数在维持稳定同步状态中的关键作用。

基于Ajax,Struts,Hibernate和Spring的J2EE架构

为有效提高Java技术在企业应用中的开发效率,缩短开发周期,减少开发成本,通过研究Ajax,Struts,Hibernate和Spring 4个开源框架的机制,依据MVC(Model-View-Controller)设计模式的基本思想,提出一种基于Ajax,Struts,Hibernate和Spring的J2EE(Java 2 Platform Enterprise Edition)应用开发策略。并阐述了将4者结合起来构建一个开发高效、运行稳定、维护简单、便于移植、易于扩展的J2EE分层架构,同时给出该架构的结构图,分析其优势及不足,并通过一个已经成功运营的在线学习系统给出了该架构的具体实现。实用结果表明,该分层架构具有良好的可移植性、可扩展性和可维护性,降低了应用程序的复杂性和耦合度,提高了开发效率。