Infrared Image Extraction Algorithm Based on Adaptive Growth Immune Field

Neural Processing Letters - In criminal investigation, there are hidden traces that many people can’t find, so infrared image is becoming an effective means to obtain these scene traces. The...     

Simulation on vertical wicking behaviors of liquid hydrogen within metallic weaves in terrestrial and microgravity environments

To predict the wicking performance of liquid hydrogen (LH₂) in porous screens, we introduced an evaporative wicking model which has been verified by experiments in liquid nitrogen (LN₂). The effects of the fluid properties, the gravity level, the superheated degree and the screen structure parameters on the vertical wicking of saturated LH₂ were systematically investigated. The wicking in LH₂ performs better than that in LN₂, presenting higher maximal wicking height and wicking velocity. At lower gravity, the wicking performance is better in whole but much more sensitive to the changes of superheated condition and structure parameters of the screen. The thermal effect of superheated gas region plays a decisive role in wicking behaviors, significantly reducing the wicking velocity and equilibrium height. The effects of permeability and thickness of the screen are obviously different at superheated condition compared to the isothermal cases.     

Piezoelectric polarization assisted WO3/CdS photoanode improved carrier separation efficiency via CdS phase regulation

The key factor for efficient photoelectrochemical (PEC) water splitting is to design a semiconductor as photoanode with high carrier separation. Piezoelectric polarization is a considerable method to improve the carriers separation efficiency via providing a powerful built-in electric field. Herein, we synthesized WO₃/CdS type II heterojunction and firstly explored the influence of CdS phase transition from sphalerite β-CdS to wurtzite α-CdS on piezoelectric polarization for WO₃/CdS. Benefited from the asymmetric structure of α-CdS, fluctuation swings can be seen in the LSV curves of WO₃/α-CdS due to piezoelectric polarization under ultrasound. The photocurrent density of WO₃/α-CdS are enhanced with the increase of ultrasound frequency and the maximum of 2.13 mA/cm² at 1.23 V vs. RHE, which is 1.61 times before ultrasound. The outstanding PEC performances of WO₃/α-CdS under ultrasonic conditions are contributed to carrier separation driven by enhancing internal electric field between heterojunction, the built-in electric field inside the α-CdS and ballast carriers participating in water splitting reaction. This work provides a promising strategy for improving carrier separation efficiency in photoelectrodes via piezoelectric polarization.     

传统造物视角解析当代智能家居“和”文化设计

从中国传统造物审美的视角来分析当代智能家居设计，通过对当代智能家居市场产品进行调研，使用对比研究的方法对现有产品功能点，交互点，及内部系统逻辑进行对比分析，研究当代智能家居在用户生活中的交互性及用户在整个使用产品过程中的参与性。从产品的情感化设计，用户需求层次，美学技法，审美设计的动态平衡等方面来论证传统造物思想在当代智能设计中的内在联系，将当代智能产品回溯到传统本真，遵循“道法自然”的设计原则。传统造物设计核心思想为人性化设计，即无论设计任何产品都应该考虑到人的使用因素，但人并非凌驾于物之上，两者应和谐相处，才能到达“和”的设计思想理念，此时人与物也会发挥最大效能。     

高盐工业废水资源化利用领域电渗析技术的研究进展

随着全球工业化进程的不断加快,高盐工业废水的排放量越来越大,采用电渗析技术将高盐工业废水进行资源化利用已成为一种发展趋势。从工艺优化及耦合工艺开发两个方面对电渗析技术在高盐工业废水资源化利用领域的研究状况进行综述,并对未来电渗析技术研究重点进行展望。     

Molten-salt synthesis of Ba5−xSrxNb4O15 solid solutions and their enhanced humidity sensing properties

Layered perovskite-type niobates A₅Nb₄O₁₅ (A = Ba, Sr) are thought to be good candidates for microwave dielectric and water-splitting applications, but traditional solid-state syntheses of these compounds usually require high temperatures and complicated procedures. In this work, Ba_5?xSr_xNb₄O₁₅ (x = 0 ? 5) perovskite solid solutions were obtained using a facile molten salt synthetic method. The crystal structure of Ba_5?xSr_xNb₄O₁₅ solid solutions were characterized by X-ray diffraction (XRD). Crystal structure parameters with different Sr²⁺ concentrations show that the lattice parameters and unit cell volumes of Ba_5?xSr_xNb₄O₁₅ decrease with increasing [Sr²⁺]. The humidity sensing behavior of Ba_5?xSr_xNb₄O₁₅ solid solutions was investigated over a wide relative humidity (RH) range, from 11% to 95%. Ba₂Sr₃Nb₄O₁₅ shows the highest sensitivity among the obtained samples with a humidity hysteresis of ca. 4% RH. The response-recovery times of the Ba₂Sr₃Nb₄O₁₅ sensor are only 2 s and 17 s as the humidity alternates between 11% and 95% RH, respectively, showing excellent potential as a humidity sensing material for practical applications.     

Novel approach of distributed & adaptive trust metrics for MANET

It is known to all that mobile ad hoc network (MANET) is more vulnerable to all sorts of malicious attacks which affects the reliability of data transmission because the network has the characteristics of wireless, multi-hop, etc. We put forward novel approach of distributed & adaptive trust metrics for MANET in this paper. Firstly, the method calculates the communication trust by using the number of data packets between nodes, and predicts the trust based on the trend of this value, and calculates the comprehensive trust by considering the history trust with the predict value; then calculates the energy trust based on the residual energy of nodes and the direct trust based on the communication trust and energy trust. Secondly, the method calculates the recommendation trust based on the recommendation reliability and the recommendation familiarity; adopts the adaptive weighting, and calculates the integrate direct trust by considering the direct trust with recommendation trust. Thirdly, according to the integrate direct trust, considering the factor of trust propagation distance, the indirect trust between nodes is calculated. The feature of the proposed method is its ability to discover malicious nodes which can partition the network by falsely reporting other nodes as misbehaving and then proceeds to protect the network. Simulation experiments and tests of the practical applications of MANET show that the proposed approach can effectively avoid the attacks of malicious nodes, besides, the calculated direct trust and indirect trust about normal nodes are more conformable to the actual situation.

     

双馈风电机组的自适应神经网络保性能虚拟同步机控制

近年来，可再生能源的电网渗透率逐年提升，电网对可再生能源参与一次、二次调频的需求也愈加紧迫，虚拟同步机技术（VSG）应运而生.VSG能够赋予新能源机组主动参与电网调频的能力，然而当VSG应用于双馈感应风力发电机（DFIG）时，存在动态过程中转子电流超出转子侧变流器（RSC）容量的风险.本文提出一种应用于DFIG的保性能虚拟同步控制器，通过使用误差映射函数将输出受限的系统转化为等价的不受限系统，并使用李亚普诺夫方法设计保性能控制器，保证转子电流在调频、故障穿越等强动态过程中不超过任意人为设定的限制；此外，利用神经网络自适应策略，对发电机组中的不确定动态特性进行补偿，从而获得理想的控制效果.最后，本文通过大量仿真验证了所提控制策略在调频能力、转子电流控制和应对参数偏差等方面的控制性能.