Nanostructures based on flexible material are essential for modulating reflected colors by actively changing the unit structure. However, current nanostructures face challenges in achieving active and efficient modulation across a broader spectral range. Here, we propose a stretchable color management method. The structure consists of a polydimethylsiloxane (PDMS) flexible substrate and cross-shaped lithium niobate (LiNbO3). This study achieves reflection color changes, continuous adjustment, and automatic switching of solar spectrum reflectance by optimizing the geometric structure. It shows that the spectral tuning range is larger, benefiting from the special nanostructures and the stretchability of PDMS, which result in a larger tunable period range and a maximum wavelength shift of nearly 180 nm. Moreover, this unique design has been effectively balanced and optimized to respond to different polarization waves. Finally, the sensing characteristics of the nanostructure are studied through its response to changes in the refractive index (RI). The results demonstrate a method with implications for flexible electronic devices, color generation, and biochemical sensing, contributing to progress in flexible wearable technology and green building.

The square and ring-shaped graphite four-band ultra-narrow-band absorber in this paper achieve perfect absorption. Therefore, the four waves of perfect transmission in the middle infrared band have been achieved, and there are four common values at lambda 1 = 2471.33 nm, lambda 2 = 2553.81 nm, lambda 3 = 2588.4 nm and lambda 4 = 2661.9 nm. Their ultra-high reflectors are 99.95 %, 96.65 %, 92.87 %, and 97.65 %, respectively, and the average reflective rate is 96.78 %. This is achieved in the graphene array structure of the pattern. Single-layer graphene is due the nearfield enhancement has achieved almost perfect absorption. From the characteristics of graphene, a single variable is used to compare the effects of each variable on the efficiency of the absorber. From the perspective of incident light, it can be understood that the absorber can work within a wide range of incident angle to achieve a high absorption rate. The results obtained from the changes in environmental refractive index are more interesting. The structural model in this chapter has a high FOM (Figure of Merit) and can act as a atmospheric refractive index sensor.

In recent years, the development of terahertz (THz) technology has attracted significant attention. Various tunable devices for THz waves (0.1 THz–10 THz) have been proposed, including devices that modulate the amplitude, polarization, phase, and absorption. Traditional metal materials are often faced with the problem of non-adjustment, so the designed terahertz devices play a single role and do not have multiple uses, which greatly limits their development. As an excellent phase change material, VO2’s properties can be transformed by external temperature stimulation, which provides new inspiration for the development of terahertz devices. To address these issues, this study innovatively combines metamaterials with phase change materials, leveraging their design flexibility and temperature-induced phase transition characteristics. We have designed a THz intelligent absorber that not only enables flexible switching between multiple functionalities but also achieves precise performance tuning through temperature stimulation. Furthermore, we have taken into consideration factors such as the polarization mode, environmental temperature, structural parameters, and incident angle, ensuring the device’s process tolerance and environmental adaptability. Additionally, by exploiting the principle of localized surface plasmon resonance (LSPR) accompanied by local field enhancement, we have monitored and analyzed the resonant process through electric field characterization. In summary, the innovative approach and superior performance of this structure provide broader insights and methods for THz device design, contributing to its theoretical research value. Moreover, the proposed absorber holds potential for practical applications in electromagnetic invisibility, shielding, modulation, and detection scenarios.

In this paper, propose a highly sensitive absorber that utilizes graphene-based patterns to achieve perfect absorption on three different spectral bands. This absorber is designed as a traditional metamaterial structure, optimized to achieve perfect absorption. With the participation of surface plasmon resonance, the absorber achieved absorption rates of 99.14 %, 98.21 %, and 99.32 % at resonance wavelengths of 2933.53 nm, 2956.05 nm, and 3360.45 nm, respectively. Considering factors such as impedance matching and electric field, provide a comprehensive physical explanation for the generation of these absorption peaks. In addition, demonstrated how can modify the wavelength of the absorption peak by adjusting the Fermi energy, and fine tune the absorption rate of a fixed wavelength by manipulating the relaxation time, thereby demonstrating the versatility of our design. In addition, this research explored the complex relationship between the Fermi level and the resonant wavelength and studied the influence of the refractive index of the dielectric layer on the resonant wavelength. It is worth noting that this relationship can be expressed as a strict linear function. As the external refractive index changes, calculated the sensitivity of the absorber, with a peak sensitivity of 768.75 nm/RIU (refractive index unit). This high sensitivity corresponds to a quality factor of 93.31 for the absorption peak. At the same time, our absorber also has good insensitivity to incident angles. In summary, due to its outstanding performance characteristics, this research proposed absorber has broad application prospects in fields such as optoelectronic detection and high sensitivity sensors.

This article reviews the physical mechanism of spin-dependent magnetoresistance and its early application in sensors. The magnetic field performance generated by the current to be measured is explained. According to the realization of the magnetoresistance measurement of this characteristic, seven main indicators of the current sensor are summarized. Starting with the structure of magnetoresistance devices and magnetoresistance units of current sensors based on spin-dependent magnetoresistance effect, several design methods of sensors and their advantages and disadvantages are analyzed. Starting from the role of AMR, GMR and TMR in magnetoresistance cells, the structure of series and parallel arrays, permanent magnet bias, coil bias, coil reset, flux aggregator and superconducting ring are analyzed, and several design methods of sensors are summarized as well as their advantages and disadvantages. Finally, the possible development direction of the current sensor is forecasted based on the recently discovered spin correlation effect.

With the development of science and technology, people have realized the value of studying the terahertz band, in this paper, a terahertz bandwidth tunable metamaterial based on composite structure of single layer graphene is proposed, which can have an absorption higher than 0.9 at 3–6.7 THz and exhibit polarization insensitivity. By employing parameter inversion to calculate the relative impedance, the metamaterial adheres to the principles of impedance matching theory. The metamaterial exhibits considerable chemical and physical tuning capabilities, and it can be substantiated that the enhanced absorption rate of the metamaterial stems from a multitude of graphical configurations. Simultaneously, the metamaterial demonstrates a notable level of stability towards the incidence angle of electromagnetic waves and can function reliably at an incidence angle of 30°. In conclusion, the metamaterial holds promising potential for applications in radar stealth, communication, and other related domains.

The article designed an aquaculture management and water monitoring system which is based on underwater operation robot. The system capture the environment by high network camera. Then photos are used to target recognition and analysis by AI,which can dynamic monitor the aquatic target. The system can monitor the water quality by adding sensor array module. The system can dynamic monitor and aquatic and water quality by Weixin application. The system can not only realize the networking of aquaculture, the visualization of aquaculture, but also dynamic monitor the water quality remotely, realize the accurate capture of aquatic and improve the capturing efficiency.

In this paper, a dual-band tunable perfect plasmon absorber based on graphene split-ring-resonator is proposed. The device is composed of resonant ring graphene with an open top layer, a thick PMMA spacer layer and a Cu substrate mirror layer, which has simple structural characteristics. By FDTD simulation method, the numerical results show that perfect absorption is achieved at resonance wavelengths lambda(A) = 39.30 mu m and lambda(B) = 62.00 mu m, and the absorption rates are 99.55% and 99.64%, respectively. By adjusting the geometric parameters of graphene array, changing the structural period P and PMMA dielectric thickness, the absorber can achieve perfect absorption. In addition, the resonance wavelength and absorption peak of the absorber can be effectively tuned by controlling the chemical potential, relaxation time and dielectric constant inside the absorber. At last, we exposed the structure to different environmental refractive indices, and calculated the corresponding maximum sensitivities of the two resonant modes as SA = 13.82 mu m/RIU and S-B = 21.47 mu m/RIU. The maximum figure of merit are FOM1 = 4.4870 RIU-1 and FOM2 = 3.5148 RIU-1 respectively. Therefore, the design of graphenebased tunable perfect metamaterial absorber proposed in this study can be applied to photodetectors, sensors and other fields.

Solar energy is an inexhaustible clean energy. However, how to improve the absorption efficiency in the visible band is a long-term problem for researchers. Therefore, an electromagnetic wave absorber with an ultra-long absorption spectrum has been widely considered by researchers of optoelectronic materials. A kind of absorbing material based on ZnS material is presented in this paper. Our purpose is for the absorber to achieve a good and wide spectrum of visible light absorption performance. In the wide spectrum band (553.0 THz–793.0 THz) of the absorption spectrum, the average absorption rate of the absorber is above 94%. Using surface plasmon resonance (SPR) and gap surface plasmon mode, the metamaterial absorber was studied in visible light. In particular, the absorber is insensitive to both electric and magnetic absorption. The absorber can operate in complex electromagnetic environments and at high temperatures. This is because the absorber is made of refractory metals. Finally, we discuss and analyze the influence of the parameters regulating the absorber on the absorber absorption efficiency. We have tried to explain why the absorber can produce wideband absorption.

针对目前有人值守停车场控制系统的缺点,设计了基于5G网络智慧无人值守停车场控制系统.系统利用高清网络摄像头抓拍车辆信息传送到云端服务器,云端服务器智能解析车辆信息,通过5G网络发送命令控制道闸起落杆.系统利用微信小程序弥补停车场客户端的不足,通过二维码技术将客户与停车场进行有效连接.系统不仅实现停车场网络化、无人化、智能化,实现停车场之间的互通互联,而且能够对现有停车场系统进行升级换代,降低人工成本,提高停车场运营效率.

采用433 MHz无线射频技术,设计以STM32单片机为中央控制器构建远距离无线呼叫网络.首先通过嵌入式技术实现433 MHz无线呼叫系统信号接收和发射,然后通过单片机对433 MHz无线射频信号解码,通过蓝牙模块转发给上位机,使上位机能够收到无线呼叫系统的呼叫,及时处理呼叫号码.解决现有有线网络布线繁琐,维护不便,设备固定等缺点.因此该无线呼叫系统成本低、质量高、易用性强,适应公共场所使用.

针对传统数控系统控制精度不高、智能程度不强、无通信网络、无法实现控制系统联网和协调控制等缺点.设计一种智能数控控制系统,将4G网络技术以及智能化技术应用于数控机床控制系统,然后对系统的硬件及软件进行模块化设计.使该系统不仅实现数控控制系统实现数字化、智能化、网络化,而且能够对现有的数控系统进行升级换代,降低车间改造成本,提高车间生产效率.

The article designed a new wireless telephone voice monitoring system that is based on WIFI module.The sys-tem samples and records the telephone voice by use of main controlling chip SC6138 produced by SiLan Company.The tele-phone voice audio signal is saved as files in SD card and USB.At the same time the voice files stored is transferred live to the remote monitoring terminal through WIFI module when needed.First the hardware circuit of this system is designed and the working principle is elaborated on for each function module of the system.At last the software for the major operational mod-ules and their flow chart are designed.The testing results of the system find that it is of a high mobility and without a host ma-chine it can store voice and be remotely monitored via WIFI.

Now generally smart phone or Pad is embedded RTOS ( real time operation system) which is based on single core or multi code ARM. They are all based on single OS. This paper brings up one method which the two OS base on ARM core. The main OS is the embedded RTOS which is provided by hand device. And it does not open to developer. By adding the secondary OS and virtual machine, at the same time the secondary OS will fully open to developer. It realizes that the developer can control the hardware source of hand device directly by secondary OS and do not need to add any other hardware. Thus will realize the sec-ondly development for the device without adding any new hardware circuit.

双操作系统是虚拟机运行在主操作系统,然后通过虚拟机来运行从操作系统.从操作系统的任务调度只能等到主操作系统任务调度空闲才能调度.导致不能及时响应高优先级别的任务,系统容易崩溃.因此如果先运行虚拟机,再运行主从操作系统,最后通过虚拟机来调度主从操作系统任务,同时改进双操作系统间的任务调度策略.那么就能保证整个双操作系统任务之间的平滑调度,从而使整个系统稳健可靠运行.

随着3G的迅猛发展,3G中的 WCDMA技术得到广泛应用,其中 WCDMA射频信号收发系统在WCDMA技术中起着十分重要的作用。阐述了 WCDMA射频信号收发系统的主要性能指标,对 WCDMA射频信号接收和发送子系统以及收发系统的电路进行了设计。测试结果表明,该系统的接收灵敏度高、相邻信道选择性检测结果符合要求。同时该系统的电路简单可靠,硬件成本低,具有较强的实用性。