二次供水并联泵组节能优化研究

多泵并联变频给水作为二次供水系统中最主要的运行方式,具有稳定、可靠、节能的优点,但在实际应用中仍会因为工况分析不全面、泵组搭配不佳等问题导致节能效果不尽人意.为此,以二次供水常用的同型号双泵、三泵变频泵组为对象,探究其并联运行工况,提出"过渡低效区"的概念并分析其危害、产生原因及消除方式,借此概念给出了"改用变频大泵+...     

黎凡特盆地油气地质特征与勘探方向

基于地质-地球物理资料和最新的油气勘探成果,应用石油地质综合研究方法和成藏组合快速分析技术,研究了黎凡特盆地的油气成藏特征,划分了成藏组合并分析了其成藏模式,探讨了盆地未来的勘探方向。盆地经历裂谷期、被动大陆边缘期、构造反转期3期构造演化。以中新统、上新统和中生界储层为核心,划分为3套成藏组合。中新统成藏组合最重要,渐新统-中新统生物成因气、古尼罗河大型水系盆底扇浊积砂岩优质储层、构造反转期形成的大型构造圈闭和墨西拿阶盐岩区域盖层的良好配置是油气富集的关键;上新统成藏组合表现为中小型海底峡谷水道浊积砂岩控藏,油气近源成藏;以白垩系碎屑岩及侏罗系生物礁潜在储层为核心,推测深水区发育中生界成藏组合。三者为未来重点勘探方向,深水区中新统和深层中生界是最有潜力的领域。     

The Main Progress of Perovskite Solar Cells in 2020–2021

Perovskite solar cells (PSCs) emerging as a promising photovoltaic technology with high efficiency and low manufacturing cost have attracted the attention from ...     

基于自适应空间正则化的视觉目标跟踪算法

为解决相关滤波类视觉跟踪算法中的边界效应问题,提出一种基于自适应空间正则化的视觉跟踪算法.在经典滤波模型中引入自适应空间正则化项,通过建立正则权重在相邻帧之间的关联,自适应调整当前帧的模型正则化权重,减小边界效应的影响.采用自适应宽高比的尺度估计策略,以及基于颜色直方图相似度的模型更新策略,抑制模型漂移,提高跟踪准确性.实验显示,该算法在UAV123,OTB2013,OTB2015这3个数据集上的跟踪成功率和精确度均高于所有对比的算法,且即使在复杂场景中也能保持良好的跟踪效果.特别是在出现运动模糊和目标在平面内旋转2种情况时,该算法的跟踪成功率较排名第2的算法分别提升了9.72个百分点和9.03个百分点,说明所提出的算法具有较好的适应性.     

基于双向位图的CSR大规模图存储优化

大数据时代, Graph500是评测超级计算机处理数据密集型应用能力的重要工具, E级验证系统的图遍历处理能力主要受限于内存空间和访存带宽, 尤其是内存空间利用率直接决定了图的测试规模和测试性能.针对天河E级验证系统小内存特征, 提出了基于双向位图的大规模图数据压缩存储方法(bidirectional-bitmap based CSR, Bi-CSR), Bi-CSR在CSR矩阵压缩的基础上引入行方向位图和列方向位图协同完成稀疏矩阵压缩存储, 行方向位图主要负责行方向位图的压缩存储与索引, 列方向位图除了进一步压缩图存储空间, 还负责为顶点遍历向量并行优化提供加速空间.Bi-CSR大幅度减少了稀疏矩阵存储空间.面向天河E级验证系统, 当图输入规模为2\\+\\{37\\}时, Graph500的图存储空间节约效率接近70%, 全系统稳定测试性能为2.131E+12TEPS, 性能最大加速比超过100倍.     

磷矿的微生物浸出研究进展

磷矿不仅是一种化工矿物原料,更是一种重要的战略资源。在我国磷矿资源日益短缺和环境污染问题日趋严重的大背景下,科学、合理地利用宝贵的磷矿资源是解决这一问题的有效途径。与传统工艺相比,微生物冶金技术有成本低、能耗低、流程简单和环境友好等特点,在低品位难选冶的矿产资源的开发中有着广阔的应用前景。介绍了目前我国磷矿资源的特点和现有的浸矿微生物种类;接着对比了各个菌种浸矿的特点,发现中等嗜热菌为浸矿效果最好的菌种,二步浸出效果明显优于一步浸出。分析了细菌的浸矿优势、发展历史和研究现状,详细介绍细菌在浸出磷矿过程中的作用机理。指出微生物浸矿存在的问题及改进方法,对微生物选冶技术的发展前景进行了展望。     

旋风分离器更换的施工方法及措施

炼油装置中ARGG装置占有重要地位,其反应/再生系统中旋风分离器的分离效果直接影响到反应/再生系统的正常运转,对于性能不满足要求的旋风分离器要及时进行更换。文中以大庆炼化公司ARGG装置为例,阐述了再生器内旋风分离器更换的施工难点及施工工艺,为再生器内旋风分离器的更换方法开辟了新路。     

Gold—sulphide versus sulphide centres on (100) AgIBr surfaces: characterization and mechanism

Abstract

Cubic AgIBr emulsions sensitized by sulphur-plus-gold with gold added at 40°C either before or after sulphur sensitization at 70°C were prepared and studied. Gold ions incorporate into the silver-sulphide centres and decrease the diffuse reflectance spectroscopy (DRS) response. The emulsions with gold added before the heat cycle through 70°C showed a dependence on the amount of gold for a speed increase at 0.01 s and their reciprocity failure property, whereas the emulsion with gold added at 40°C after the heat cycle did not. Gold present at the elevated sensitization temperature enhanced long-wavelength sensitivity in a wider wavelength region than gold added after the heat cycle. The different sensitometric behaviour between gold added before or after the heat cycle could be explained by the enhanced thiosulphate conversion effect of gold at 70°C. The electron trapping energy level of the sensitization centre is speculated to be slightly higher for sulphur-plus-gold than sulphur sensitization. Opposite trends were observed in DRS and long-wavelength sensitivity when the gold level increased. Whether the electronic effect of gold during exposure on top of its latensification effect in sulphur-plus-gold sensitization could be observed seems to be dependent on the sulphur level. A mechanism is proposed.     

Microstructure and mechanical properties of poly (vinyl chloride) modified by silica fume / acrylic core-shell impact modifier blends

This research explored replacing acrylic core-shell impact modifier (AIM) by silica fume to toughen PVC. 100%, 75%, 50% and 25% of AIM (8 phr) were substituted by silica fume in PVC respectively, and then processed by dry blending and twin-screw extrusion. Severe silica fume agglomeration was observed by scanning electron microscope (SEM) in the PVC matrix when 8 phr pure silica fume was used and processed by screw speed of 20 rpm. Its tensile strength was thereby reduced by 38% comparing to unmodified PVC. The silica fume was successfully dispersed while the screw speed was slowed down to 10 rpm to give a stronger screw torque and a longer melt residential time in the extruder. The tensile strength was ’recovered’ to a level comparable to unmodified PVC. Impact test were performed on all formulations extruded at 10 rpm screw speed and synergetic toughening effect was found with 50% substitution and it had the impact strength that was comparable to 8 phr pure AIM toughened PVC.     

浅谈计算机基础实验室的管理

随着计算机信息技术的高速发展,计算机基础实验室的建设和管理也面临着各种新的挑战和考验,本文通过分析对当前计算机基础实验室管理中存在的问题,从完善各项规章制度、加强实验室管理人员的素质建设等方面,提出加强计算机基础实验室建设和管理的一些思路和方法。