Reference guided image super-resolution via efficient dense warping and adaptive fusion

Due to the limited improvement of single-image based super-resolution (SR) methods in recent years, the reference based image SR (RefSR) methods, which super-resolve the low-resolution (LR) input with the guidance of similar high-resolution (HR) reference images are emerging. There are two main challenges in RefSR, i.e. reference image warping and exploring the guidance information from the warped references. For reference warping, we propose an efficient dense warping method to deal with large displacements, which is much faster than traditional patch (or texture) matching strategy. For the SR process, since different reference images complement each other, and have different similarities with the LR image, we further propose a similarity based feature fusion strategy to take advantage of the most similar reference regions. The SR process is realized by an encoder–decoder network and trained with pixel-level reconstruction loss, degradation loss and feature-level perceptual loss. Extensive experiments on three benchmark datasets demonstrate that the proposed method outperforms state-of-the-art SR methods in both subjective and objective measurements.     

Inconel 690传热管GTAW对接焊接头组织及力学性能研究

对Inconel 690传热管材进行钨极气体保护焊(GTAW)对接焊,采用拉伸试验机、压扁试验机和光学显微镜测试和分析传热管焊接接头,同时利用ANSYS软件开展焊接接头在设计工况失压时的一次应力强度校核。研究结果表明:焊缝中心为树枝胞状晶,熔合线附近为粗大柱状晶。室温时接头的平均抗拉强度为619 MPa,平均屈服强度为292 MPa,350℃时接头平均抗拉强度为475 MPa,平均屈服强度为206 MPa,拉伸接头断裂从熔合区开始贯穿整个焊缝组织,呈塑性断裂。压扁试验和反向压扁试验结果表明管接头完好。通过ANSYS分析可知,设计工况下传热管接头350℃许用应力强度150 MPa限值可满足其一次应力强度要求,且裕量较大。     

Using “intercalation bridging” to effectively improve the electrothermal properties of sheet graphite / ultrafine carbon powder conductive paste for screen printing

Electrothermal materials can easily and controllably convert electric energy into heat energy, and are widely used in many electrothermal fields. In this paper, a series of conductive pastes were simply prepared by ball milling, and their rheological and electrothermal properties were studied. Phenolic resin was used as curing agent of epoxy resin and rheological modifier, which could make the paste have very good printing applicability. Ultrafine carbon(UC) powder has excellent dispersion effect. Sheet carbon materials such as graphite powder(GP), graphite nanosheet(GS) and graphene(GE) would improve the performance of paste using only UC as conductive filler. It was proved that GE with the smallest thickness has the most obvious lifting effect. UC was gathered around the graphene sheet, as a bridge between graphene sheets. GE could also be connected with each other to build a more effective and denser conductive path. The electrothermal film could reach 199°C under 30 V voltage, increasing by 254.7% compared with the electrothermal film with only UC as conductive filler. The electrothermal film had a short response time, good recyclability and excellent flexibility. The electrothermal film also had certain electromagnetic shielding efficiency. The electromagnetic shielding efficiency SE could reach about 20 dB at 30–1500 MHz, and the ratio of field strength before and after attenuation SE_% could reach 97%?+?. This electrothermal film has simple preparation process, good printing applicability, controllable film resistance, excellent flexibility, fast response speed and good recyclability. It is suitable for large-scale preparation and has broad application prospects in many scenarios.

     

Approximation Optimal Vibration Control with Applications to Jacket Offshore Platforms with Nonlinear Dynamic Characteristics

International Journal of Control, Automation and Systems - The vibration control problem of offshore jacket platforms is studied. The model of offshore platforms with nonlinear interactions of the...     

QuEChERS-气相色谱质谱法测定苹果中45种农药残留

建立了QuEChERS-气相色谱质谱法同时测定苹果中45种农药残留检测方法,样品以1%乙酸乙腈提取,经25 mg PSA、25 mg C₁₈和7.5 mg GCB净化,GC-MS选择离子监测(SIM)模式下检测,基质匹配外标法定量。检测结果表明,45种农药在10~200 μg/L质量浓度范围内线性关系良好,各农药的线性相关系数均大于0.995;在30、50和100 μg/kg添加水平下,45种农药的回收率在69.3%~116%之间,相对标准偏差在0.7%~7.9%之间;方法的检出限在1.5~15.0 μg/kg之间,定量限在5.0~50.0 μg/kg之间。该方法准确度高、精密度好、步骤简单、操作快捷、成本低廉,适用于苹果中农药残留的检测。     

大豆多肽的分离纯化及其体外降血脂功能研究

通过HepG2肝癌细胞构建高胆固醇细胞模型，以大豆蛋白为对照组，分析了大豆多肽的体外降血脂活性，并通过凝胶过滤层析法和纳米技术-高效液相色谱-串联质谱（Nano-HPLC-MS/MS）技术对大豆多肽进行了初步纯化和鉴定。结果表明，大豆多肽对HepG2细胞内甘油三酯（TG）、总胆固醇（TC）和低密度脂蛋白胆固醇（LDL-C）的产生具有一定的抑制作用，对HepG2细胞内高密度脂蛋白胆固醇（HDL-C）的产生和超氧化物歧化酶（SOD）活力具有促进作用，且大豆多肽对HepG2细胞内TG、LDL-C的抑制作用及对HDL-C和SOD活力的促进作用均强于对照组，具有良好的体外降血脂活性。大豆多肽经分离纯化，最终鉴定并筛选出5个多肽，分别编号为LLDTN、FLEHAF、DFGKFF、LVGLKLY和LIDSVLDVVRK，相应的分子质量分别为574.30 Da、762.37 Da、759.36 Da、804.51 Da和1 255.75 Da。     

鲣鱼蛋白肽谱效关系研究

采用鲣鱼为原料,以蛋白质回收率为指标,酶解制备不同工艺条件的样品。通过测定其黄嘌呤氧化酶(XOD)抑制活性、ORAC值、分子质量分布图谱和总氨基酸含量,构建鲣鱼蛋白肽体外化学活性与其分子质量分布图谱、总氨基酸含量图谱之间的谱效关系。结合超高效液相-质谱联用(LC-MS/MS)方法研究其降尿酸肽和抗氧化肽的分布。研究表明,鲣鱼蛋白肽的XOD抑制活性与其ORAC值具有显著的相关性。由多肽分子质量<1ku所占含量的分布区段和脂肪族氨基酸的含量可初步预测鲣鱼蛋白肽的化学活性。质谱分析表明,纯化组分的质谱基峰图在不同时间段的信号强度与鲣鱼蛋白肽的降尿酸活性和抗氧化活性具有明显的相关性。     

新型斩切式稻杆粉碎机的设计与试验研究

针对目前秸秆粉碎装置存在缠轴铰刀、出料过长、无法有效处理湿度较大的稻秆等问题,论文提出了一种适于田间作业的新型斩切式稻杆粉碎机。通过Solidworks进行整体建模,基于TRIZ理论对曲轴同步输送斩切装置进行创新设计,并对圆弧形齿轮啮合调隙机构、二次粉碎装置进行了设计,对斩刀滑切角度参数进行计算,利用COMSOL软件对曲轴连杆强度进行有限元分析。制作了实物样机并进行粉碎试验,样机尺寸1.62 m×0.75 m×1.2 m、重量250 kg、试验结果表明生产效率达3.64 m^3/h、出料长度5 mm^10 mm、粉碎合格率90%左右,可大大提高稻杆利用价值,具有广阔的市场前景。     

深度学习识别光网络单元故障的设计与应用

为解决依赖装维上门鉴别光网络单元故障带来的不便,可以从机器视觉入手实现自动化故障识别。近年,ImageNet挑战赛的成功推动了物体识别技术的跨越式发展,特别是基于卷积的深度学习技术在视觉识别方面已经达到人类水平,为光网络单元故障的自动识别提供了技术基础。文章对识别光网络单元的工作状态进行了研究,将设备工作状态分为7个场景,提出了利用手机APP采集图片识别故障的解决方案并投入了实际生产;重点阐述了深度学习模块的设计与实现,提出一种通过算法整合的方式综合运用物体检测和图像分类算法,分3阶段逐步求精,解决了图片过滤,光网络单元型号和状态识别等问题,实现了基于计算机视觉自动识别光网络单元故障。从数据上看产品的端到端准确率超过84%,识别速度达到10 FPS,月均提供服务超过1万人次,在减少用户等待的同时节约了人力资源。     

Looking ahead: Joint small group detection and tracking in crowd scenes

Small group detection and tracking in crowd scenes are basis for high level crowd analysis tasks. However, it suffers from the ambiguities in generating proper groups and in handling dynamic changes of group configurations. In this paper, we propose a novel delay decision-making based method for addressing the above problems, motivated by the idea that these ambiguities can be solved using rich temporal context. Specifically, given individual detections, small group hypotheses are generated. Then candidate group hypotheses across consecutive frames and their potential associations are built in a tree. By seeking for the best non-conflicting subset from the hypothesis tree, small groups are determined and simultaneously their trajectories are got. So this framework is called joint detection and tracking. This joint framework reduces the ambiguities in small group decision and tracking by looking ahead for several frames. However, it results in the unmanageable solution space because the number of track hypotheses grows exponentially over time. To solve this problem, effective pruning strategies are developed, which can keep the solution space manageable and also improve the credibility of small groups. Experiments on public datasets demonstrate the effectiveness of our method. The method achieves the state-of-the-art performance even in noisy crowd scenes.