基于多时序特征和卷积神经网络的农作物分类

近年来,以卷积神经网络为主的深度学习模型在各种遥感应用中都显示出巨大的潜力。以加州帝国郡为研究区,以Landsat 8 OLI年内时序遥感影像计算时序植被指数NDVI、EVI、RVI以及TVI,组合后输入到构建的一维卷积神经网络 模型,以实现作物的高精度精细分类。为了验证卷积模型的优越性,另搭建了基于递归神经网络及其变体的深度学习模型。结果表明：①引入其他时序特征后,能够有效地提高卷积神经网络的分类精度。NDVI+EVI+TVI+RVI组合特征总体精度和Kappa系数最高,分别是89.667 4%和0.856 0,对比NDVI时序特征总体精度和Kappa系数提高了近4%和0.6。②在与其他深度学习模型的对比中,一维卷积神经网络分类精度最高,能够从时序数据中较为准确捕捉作物时序特征信息,尽管递归神经网络被广泛应用于序列数据的研究,但分类结果要略差于卷积神经网络。实验表明在NDVI的基础上引入其他植被指数辅助,能够有效地提高分类精度。基于一维卷积神经网络的深度学习框架为长时间序列分类任务提供了一种有效且高效的方法。     

顾及面积和位置差异的高分遥感影像分割质量评价方法

高分遥感影像分割质量对面向对象分类精度有着重要的影响,良好的影像分割质量有利于得到较高的分类精度。对高分遥感影像分割质量进行评价,从而找到最优的分割结果就显得十分重要。通过对比参考对象和分割对象之间的面积和位置差异,提出了一种新的高分遥感影像分割质量评价方法。将该评价方法应用于GeoEye-1高分遥感影像分割质量评价,试验结果表明:该评价方法能客观地评价影像分割质量,所得到的最优分割结果与参考对象边界匹配程度高,有利于影像后续的分类。     

A novel PMA/PEG-based composite polymer electrolyte for all-solid-state sodium ion batteries

In recent years, development of all-solid-state batteries has become a promising approach to improve the safety of batteries. Herein, we report the preparation of a new composite polymer electrolyte (CPE) for use in all-solid-state sodium ion batteries. The CPE comprising of poly(methacrylate) (PMA), poly(ethylene glycol) (PEG), α-Al₂O₃ with acidic surface sites, and NaClO₄ exhibited high ionic conductivity (1.46 × 10^-4 S·cm^-1 at 70 °C), wide electrochemical stability window (4.5 V vs. Na⁺/Na), and good mechanical strength. With the introduction of the prepared CPE and Na₃V₂(PO₄)₃, the final all-solid-state sodium ion batteries showed good rate and cycle performance, with a high reversible capacity of 85 mAh·g^-1 when operated at 0.5 C (1 C = 118 mA·g^–1) and 94.1% capacity retention rate after 350 cycles at 70 °C. Our work provides a novel solid electrolyte for the development of all-solid-state sodium ion batteries.

Open image in new window

     

校园网高效管理方案的研究

校园网是学校教学和科研以及管理活动重要的信息平台,校园网在高校建设和发展中的作用越来越大.从实用角度出发,根据目前高校校园网的运行实际,对校园网的设计、建设和管理进行探讨.     

基于FPGA的5/3提升小波优化算法

为了实现线阵CCD空间相机图像的实时压缩处理,在提升算法的基础上,提出了一种适用于FPGA的二维提升小波变换结构与实现方案.该系统利用FPGA片内的存储资源,采用乒乓操作实现了行列变换之间的数据缓存传输,降低了功耗,提高了硬件利用率和运算速度.并且为了适应硬件实现速度,在进行小波边界处理时不需要额外的边界延拓过程,很大程度上降低了算法的复杂度;整个模块采用verilog HDL语言进行设计,并在QuestaSim下进行了仿真试验.实验结果表明,该系统工作稳定可靠,完全满足实时处理的要求,并适用于JPEG2000的多级二维5/3小波变换.     

废旧轮胎催化热解油品分析

采用ZSM-5和超稳Y(USY)分子筛催化剂,利用两段法固定床研究废旧轮胎的催化热解.通过对轮胎的催化热解后的轻质油品(＜160 ℃)分析,发现热解后油品中单环芳香烃含量增加.如在热解温度500 ℃、催化温度400 ℃和催化剂与轮胎比例0.5的情况下,对没有催化剂以及含ZSM-5催化剂及USY催化剂的轮胎热解,得到的轻质馏分中苯的含量分别是0.15%、0.99%和1.89%,甲苯的含量分别是3.04%、5.68%和17.70%.这对从废旧轮胎热解油中提取化学化工物质的工艺研究有着重要的指导意义.     

杏河地区长X油层地质特征和压裂改造效果分析

对安塞油田杏河地区长X储层的地质特征进行了论述,该油藏是受砂体展布和鼻状隆起双重控制下形成的岩性—构造油藏。该地区长X储层总体来说物性相对较好,地层压力低。针对储层的特点,进行了长X层压裂技术研究,提出了适合该区长X储层的压裂改造技术,并在近两年的应用中取得了良好的效果。     

浅谈65%节能土建工程的监理控制方法

保定市格林漫都小区住宅工程是建设部确定的全国十个65%节能示范工程之一.文章结合工程实例,介绍对65%节能工程的监理控制方法.     

GPC1 Regulated by miR-96-5p,Rather than miR-182-5p,in Inhibition of Pancreatic Carcinoma Cell Proliferation

To determine the relationships between miR-96-5p/-182-5p and GPC1 in pancreatic cancer (PC), we conducted the population and in vitro studies. We followed 38 pancreatic cancer patients, measured and compared the expression of miR-96-5p/-182-5p, GPC1, characteristics and patients’ survival time of different miR-96-5p/-182-5p expression levels in PC tissues. In an in vitro study, we investigated the proliferation, cycle and apotosis in cells transfected with mimics/inhibitors of the two miRNAs, and determine their effects on GPC1 by dual-luciferase assay. In the follow-up study, we found that the expressions of miR-96-5p/-182-5p were lower/higher in PC tissues; patients with lower/higher levels of miR-96-5p/-182-5p suffered poorer characteristics and decreased survival time. In the in vitro study, the expressions of miR-96-5p/-182-5p were different in cells. Proliferation of cells transfected with miR-96-5p mimics/inhibitors was lower/higher in Panc-1/BxPC-3; when transfected with miR-182-5p mimics/inhibitors, proliferation of cells were higher/lower in AsPC-1/Panc-1. In a cell cycle study, panc-1 cells transfected with miR-96-5p mimics was arrested at G0/G1; BxPC-3 cells transfected with miR-96-5p inhibitors showed a significantly decrease at G0/G1; AsPC-1 cells transfected with miR-182-5p mimics was arrested at S; Panc-1 cells transfected with miR-182-5p inhibitors showed a decrease at S. MiR-96-5p mimics increased the apoptosis rate in Panc-1 cells, and its inhibitors decreased the apoptosis rate in BxPC-3. Dual luciferase assay revealed that GPC1 was regulated by miR-96-5p, not -182-5p. We found that miR-96-5p/-182-5p as good markers for PC; miR-96-5p, rather than -182-5p, inhibits GPC1 to suppress proliferation of PC cells.     

Internet下土地利用规划信息系统应用模型研究

为实现土地利用可持续发展和土地资源信息全社会共享,结合计算机网络技术发展,提出了土地利用总体规划管理信息系统应用模型,阐述了Internet环境下分布式GIS、WebGIS客户/服务器模型及土地利用总体规划信息系统应用模型的特点、结构和实现方法.