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关键词： 洛川   旱地苹果   “3332”模式   技术要点  

摘要： 苹果矮化密植是洛川苹果产业发展的趋势和方向,是现代苹果产业发展的重要标志。苹果栽培“3332”模式在洛川旱地应用推广,能为果农节约成本、增加产量、提高质量、增加收益。

关键词： 主墩钢板围堰   圈梁   内支撑   封底混凝土   稳定性  

摘要： 文中采用MIDAS软件和理论计算相结合的方法,对银西铁路银川机场黄河桥主墩钢板围堰内力进行分析研究,考虑了两种工况(吸泥工况、抽水工况)下钢板桩受力情况,并对圈梁、内支撑以及封底混凝土内力进行了分析计算。计算结果表明:圈梁最大正应力为164.1 MPa、最大剪应力60.2 MPa、最大挠度12 mm;内支撑计算结果均小于170 MPa;封底混凝土所受最大拉应力为0.38 MPa;以上计算结果均满足设计要求。可为类似工程结构优化设计和施工控制提供依据和借鉴。

关键词： 石杉碱甲   脂质体   相变温度   油-水分配系数   脂质体-水分配系数   生物利用度  

摘要： 采用薄膜旋蒸-超声法制备了纳米石杉碱甲脂质体(Hup-A-Lip),并对其微观形貌、包封率、相变温度、分配系数及生物利用度等进行了研究.结果表明:Hup-A-Lip呈粒径约40 nm的球形结构;包封率为(82.74±2.68)%;相变温度为67℃,在25~60℃具有较好的热力学稳定性;Hup-A-Lip中药物与脂质体膜之间的作用力以静电相互作用和氢键为主;石杉碱甲(Hup-A)经脂质体包封后,明显提高了游离药物的生物利用度.

关键词： 高等教育   立德树人   MATLAB程序设计   课程思政   教学案例  

摘要： 在“三全育人”的鲜明导向下,全国高校以立德树人作为根本任务,正如火如荼地开展各学科各专业课程思政教学建设。MATLAB程序设计课程是各大理工科专业的本科生和研究生数学基础课程。该文以此课程为例,通过在教学内容中挖掘出具体的思政教学案例,旨在实现思想政治理论教育与专业课教育同频共振、相互促进,最后给出课程思政的教学效果考核依据。

关键词： Sliding mode   Photovoltaic   MPP   Grid connected   MATLAB   Simulink   DESIGN   ORDER  

摘要： The escalating global demand for clean and sustainable energy sources has trusted solar energy into the forefront of renewable energy (RE) solutions. Solar power generation, however, is profoundly influenced by ever-changing meteorological conditions, notably solar irradiation and temperature. These fluctuations have a direct impact on the voltage and current characteristics of photovoltaic arrays. To achieve optimal power transfer, a harmonious interface between the utility grid or load and solar panels is essential. In this research, the authors propose the integration of LCL filter to ameliorate harmonics emanating from inverter outputs. Additionally, a nonlinear control methodology is employed to maximize power extraction from Photovoltaic (PV) arrays at the Maximum Power Point (MPP) and to ensure a stable and less fluctuating injection of power into the grid. The primary goal of this work is to examine the effectiveness of nonlinear control techniques that assist in reducing harmonics and smoothing the output of solar power systems utilizing LCL filter. The controllers used here are nonlinear Super Twisting Reachability law -based Finite Time Sliding Mode Control (STR-FTSMC) and Arbitrary Order Finite Time Sliding Mode Control (AO-FTSMC) for the three-phase singlestage on -grid PV system in addition to sliding mode observer. The efficacy of the employed control techniques is highlighted via a comparative study in a MATLAB/Simulink environment.

关键词： Topology optimization   Additive manufacturing   Freeform structures   Matlab   Structured mesh   Smooth-edge algorithm   Compliance minimization   Compliant mechanisms   Self-supporting design   CODE WRITTEN   DESIGN  

摘要： Topology optimization has revolutionized the design of structures for various applications, particularly with the advancement of additive manufacturing. However, existing open-source codes for topology optimization have limitations, such as restricted domain initialization and lack of a CAD output after optimization. A novel opensource Matlab code, FreeTO, is presented, and it addresses these limitations by enabling the initialization of 3D arbitrary geometries and providing an STL file post-optimization. FreeTO utilizes a structured mesh and a smooth-edge (boundary) algorithm to generate smooth topological boundaries. The code is demonstrated through six practical design cases, showcasing its effectiveness in compliance minimization, compliant mechanisms, and self-supporting problems. FreeTO offers a user-friendly, all-in-one topology optimization package, making it an invaluable tool for educators, researchers, and practitioners. Future developments will focus on eliminating a few geometrical deviations in the optimized topologies, incorporating speedups, and extending the code to apply to more applications.

关键词： Electrocardiogram (ECG)   Signal Quality Assessment (SQA)   Signal Quality Index (SQI)   Telemedicine   MATLAB   Remote patient monitoring   Machine learning  

摘要： Cardiovascular diseases claim over 17 million lives annually. Prevention involves adopting healthy habits and regular check-ups, ideally outside hospitals to reduce healthcare costs, leveraging telemedicine tools. However, diagnosing CVDs outside hospitals can be challenging due to noise interference in electrocardiograms (ECGs), necessitating the use of Signal Quality Assessment (SQA) systems. This paper presents a MATLAB toolbox for automated ECG Signal Quality Assessment, featuring a novel method. Furthermore, the toolbox can extract up to 37 Signal Quality Indices (SQIs), commonly used as features in machine learning-based SQA. Therefore, our software has the potential to facilitate the healthcare process, resulting in efficient and cost-effective cardiovascular care.

关键词： 3D-printing   MATLAB algorithm   Ratiometric-sensing platform   Visualization   Semi-quantitative   Tetracycline detection   RESIDUES   MILK  

摘要： In this research, a ratiometric-sensing platform (ZIF-8/CDs) that combines non-fluorescence metal-organic frameworks (ZIF-8) with blue-green fluorescent carbon dots (CDs) has been developed for the determination of tetracycline (TC) with high sensitivity and selectivity in real samples. For this purpose, ZIF-8 with polyhedral structure was synthesized, which could form aggregation-induced emission (AIE) effect through electrostatic, hydrogen bonding, pi-pi stacking, and coordination interactions in the presence of TC, leading to enhanced intensity with a bright yellow fluorescence at 516 nm, acting as a response signal. However, the fluorescence intensity of blue-green fluorescent CDs maintained practically constant at 466 nm, serving as a reference signal. Furthermore, we integrate MATLAB algorithm and 3D-printing technology with the ZIF-8/CDs complex into a ratiometric-sensing platform for semi-quantitative detection of TC, in which 3D-printing technology is responsible for engineering an integrated dark chamber to achieve the fluorescence images of real samples, whereas MATLAB with the image processing functions and data processing capabilities utilizes to develop a mini program for calculating the RGB values of the obtained images. Consequently, the ratiometric-sensing platform in a simple, rapid, and economic way without any complicated process and expensive instruments could be used for visual/onsite detection of TC in real samples.

关键词： Piezoelectric micro-actuator   Piezoelectric energy harvester   Topology optimization   Matlab code   OPTIMAL-DESIGN   DEVICES  

摘要： This paper primarily summarize the research efforts conducted within the AS2M department of the FEMTO-ST institute, focusing on topology optimization of piezoelectric structures. In this regard, the principles and the possibilities offered by topology optimization with a specific emphasis on the SIMP approach (Solid Isotropic Material with Penalization) are highlighted. The design processes of piezoelectric micro-actuators and energy harvesters are described, The optimized piezoelectric structures are presented and the improvements over classical designs are assessed. Moreover, in this paper, we present the eigenvalue optimization of the piezoelectric energy harvester by tuning the mass of attachment as an optimization variable. The theoretical development is accompanied by the developed MATLAB code to implement the topology optimization algorithm. This code is the update and extension of the previously published codes by authors for piezoelectric structures while it will be the first published code of its kind that considers the tuning of the natural frequency of the piezo structure. Finally, the paper discusses the feasibility and the potential of multi-material topology optimization.

关键词： Finite elements   Numerical simulation   Solid-electrolyte interphase (SEI)   Finite elastic strain   (Visco-)plasticity   DEFORMATION   MATLAB  

摘要： Amorphous silicon is a highly promising anode material for next-generation lithium-ion batteries. Large volume changes of the silicon particle have a critical effect on the surrounding solid-electrolyte interphase (SEI) due to repeated fracture and healing during cycling. Based on a thermodynamically consistent chemo-elasto-plastic continuum model we investigate the stress development inside the particle and the SEI. Using the example of a particle with SEI, we apply a higher order finite element method together with a variable-step, variable-order time integration scheme on a nonlinear system of partial differential equations. Starting from a single silicon particle setting, the surrounding SEI is added in a first step with the typically used elastic Green-St-Venant (GSV) strain definition for a purely elastic deformation. For this type of deformation, the definition of the elastic strain is crucial to get reasonable simulation results. In case of the elastic GSV strain, the simulation aborts. We overcome the simulation failure by using the definition of the logarithmic Hencky strain. However, the particle remains unaffected by the elastic strain definitions in the particle domain. Compared to GSV, plastic deformation with the Hencky strain is straightforward to take into account. For the plastic SEI deformation, a rate-independent and a rate-dependent plastic deformation are newly introduced and numerically compared for three half cycles for the example of a radial symmetric particle.