检索结果-南通市图书馆

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

液压复合解卡工艺技术

油气井测试 2024年第1期33卷 32-36页

作者：平恩顺赵庆杰马克然赵磊黄其李龙中国石油集团渤海钻探工程有限公司井下技术服务分公司天津300283 中国石油大港油田分公司第三采油厂河北沧县061000

为解决复杂井修井作业过程中常规单一解卡打捞工艺成功率低,施工周期长的问题,研制了一种液压增力打捞器,详述了液压增力打捞器的主要结构,工作原理和主要技术性能参数,并配套了震击器、加速器等辅助工具,形成了液压复合解卡工艺技术,... 详细信息

为解决复杂井修井作业过程中常规单一解卡打捞工艺成功率低,施工周期长的问题,研制了一种液压增力打捞器,详述了液压增力打捞器的主要结构,工作原理和主要技术性能参数,并配套了震击器、加速器等辅助工具,形成了液压复合解卡工艺技术,并在大港油田板X井进行了现场应用。应用结果表明,该工艺不仅具备了液压增力解卡和液压增力震击解卡两种功能,而且可快速提供上提拉力和上提速度,直接将解卡上提力作用于井内卡点位置,避免了井身结构和人为因素的影响,提高了解卡打捞成功率,缩短了施工周期,具有较广泛的应用前景。

关键词：复杂井修井液压增力震击器加速器复合解卡打捞现场应用

Recovery of V_2O_5 from Bayer liquor by ion exchange

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2010年第2期29卷 115-120页

作者： zhao Zhuo LI Xiaobin zhao qingjie School of Metallurgical Science andEngineering Central South University Changsha 410083 China Zhengzhou Research Institute ofChalco Ltd Zhengzhou 450041 China

A new technology was developed to recover V2O5 from Bayer spent liquor by ion *** experimental results show that in the conditions of 105℃ and 0.20-0.25 mass ratios between CaO in lime and Al2O3 in spent liquor, the precipitation rate of vanadium in Bayer liquor is more than 85%.The vanadium-bearing precipitation is leached by NaHCO3 *** leaching rate of vanadium can reach 85% in the conditions of 95℃, 40 g·L-1 of NaHCO3 concentration, and ventilating of *** 201 × 7 type of resin has good adsorption effect on vanadium in the leaching *** adsorption rate is more than 94% with the flow rate of 0.09 mL·min-1·g-1 of leaching solution and the temperature of 40-50℃.By using 3 mol·L-1 of NaOH to desorb the saturated resin after adsorption at 40-50℃, a solution with more than 5 g·L-1 of V2O5 can be *** roasting ammonium metavanadate that precipitates from the desorption solution when NH4Cl is added at the temperature of 500-550℃ for 2 h, V2O5 with more than 99% of purity is obtained.

关键词： abstraction metallurgy V2O5 ion exchange Bayer process spent liquor

Experimental study of a highway bridge with shape memory alloy restrainers focusing on the mitigation of unseating and pounding

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2012年第2期11卷 195-204页

作者： Guo, Anxin zhao, qingjie Li, Hui School of Civil Engineering Harbin Institute of Technology Harbin 150090 China School of Civil Engineering the 2nd Campus Harbin Institute of Technology P.O. Box 2537 Harbin 150090 China

This paper presents an experimental study to investigate the performance of shape memory alloy(SMA) restrainers for mitigating the pounding and unseating of highway bridges when subjected to seismic *** property tests of the SMA wire used in the restrainers are conducted first to understand the pseudo-elastic characteristics of the ***,a series of shaking table tests are carried out on a highway bridge *** structural responses of the highway bridge model equipped with SMA restrainers,installed in the form of deck-deck and deck-pile connections,are analyzed and compared with the uncontrolled *** test results of this study indicate that the SMA restrainers are not only effective in preventing unseating but also in suppressing the seismic-induced pounding of the highway bridge model used in this study.

关键词： shape memory alloy restrainer unseating pounding highway bridge

Splitting touching cells based on concave-point and improved watershed algorithms

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2014年第1期8卷 156-162页

作者： Hong SONG qingjie zhao Yinghong LIU School of Software Beijing Institute of Technology Beijing 100081 China School of Computer Science Beijing Institute of Technology Beijing 100081 China

Splitting touching cells is important for medi- cal image processing and analysis system. In this paper, a novel strategy is proposed to separate ellipse-like or circle- like touching cells in which different algorithms are used ac- cording to the concave-point cases of touching domains. In the strategy, a concave-point extraction and contour segmen- tation methods for cells in series and in parallel are used for the images with distinct concave points, and an improved watershed algorithm with multi-scale gradient and distance transformation is adopted for the images with un-distinct or complex concave points. In order to visualize each whole cell, ellipse fitting is used to process the segments. Experimental results show that, for the cell images with distinct concave points, both of the two algorithms can achieve good separat- ing results, but the concave-point based algorithm is more ef- ficient. However, for the cell images with unobvious or com- plex concave points, the improved watershed based algorithm can give satisfying segmenting results.

关键词： touching cells splitting concave points water-shed ellipse fitting

在线全文

学校读者我要写书评

暂无评论

美好精神生活视域下思想政治教育创新研究

中共南昌市委党校学报 2024年第1期22卷 97-101页

作者：许备赵庆杰中国政法大学马克思主义学院北京100088

新时代,人民的“物质文化生活需要”得到进一步满足,人民对美好生活的全方位需要愈发凸显出精神生活的重要地位。建设美好精神生活是实现人民美好生活的内在要求,内蕴人的自由全面发展的重要价值指向,同样是新时代思想政治教育所面临的... 详细信息

新时代,人民的“物质文化生活需要”得到进一步满足,人民对美好生活的全方位需要愈发凸显出精神生活的重要地位。建设美好精神生活是实现人民美好生活的内在要求,内蕴人的自由全面发展的重要价值指向,同样是新时代思想政治教育所面临的重要课题。在美好精神生活的建设进程中,思想政治教育具有引领主流文化价值、输送强劲精神动力、培养高素质时代新人的重要时代意义。思想政治教育的发展也面临一定的现实困境,存在与人民美好精神生活的需求之间不匹配的问题,如:内容层次单一、功能发挥受制、教育方式生硬等。在社会主义现代化强国建设的新征程上,加快实现人民群众对美好生活的向往,必然要求深入探讨并解决思想政治教育遭遇的现实掣肘,从创新教育内容、焕发功能优势、健全教育方式等方面创新思想政治教育的发展路径,进而促进美好精神生活的实现。

关键词：思想政治教育美好精神生活美好生活时代新人

维普期刊数据库博看期刊

0~3岁儿童血常规指标与25羟维生素D关系的横断面研究

在线全文

学校读者我要写书评

暂无评论

妇儿健康导刊 2024年第10期3卷 195-198,F0003页

作者：曾铮任捷赵庆洁北京万柳美中宜和妇儿医院儿科北京100089

目的分析0~3岁儿童血常规指标与25羟维生素D[25(OH)D]的关系。方法选取2018年1月至2022年12月在北京万柳美中宜和妇儿医院保健体检的851名0~3岁儿童纳入横断面研究。采用单因素相关及回归分析、多因素线性回归模型分析平均红细胞体积(M... 详细信息

目的分析0~3岁儿童血常规指标与25羟维生素D[25(OH)D]的关系。方法选取2018年1月至2022年12月在北京万柳美中宜和妇儿医院保健体检的851名0~3岁儿童纳入横断面研究。采用单因素相关及回归分析、多因素线性回归模型分析平均红细胞体积(MCV)与25(OH)D的关系。结果851名0~3岁儿童中,25(OH)D水平为16.75~212.95 nmol/L,平均(84.54±31.11)nmol/L,维生素D缺乏14例(1.65%),维生素D不足108例(12.69%),无维生素D过量;血红蛋白水平为83~151 g/L,轻度贫血66例(7.76%),中度贫血3例(0.35%),无重度贫血,总贫血率为8.11%;红细胞计数为(3.25~6.23)×10^(12)/L,MCV为52.8~98.8fl。25(OH)D低水平组与高水平组MCV、母亲生育年龄、体检月份比较,差异有统计学意义(P<0.05)。单因素相关分析:Pearson相关系数(r)=0.105,P=0.001。单因素回归分析:方程检验F=9.401,P=0.002;回归系数β=0.737(95%CI 0.265~1.209),t=3.066,P=0.002。多因素线性回归分析显示,MCV与25(OH)D呈正相关;每年5月1日至10月31日体检的儿童25(OH)D水平较高;月龄增大,25(OH)D呈下降趋势(P<0.05)。结论0~3岁儿童MCV与25(OH)D水平呈正相关,可利用MCV作为25(OH)D变化的敏感指标,在血常规检查中发现MCV水平较低者可考虑关注其维生素D营养状况。

关键词： 25羟维生素D 平均红细胞体积贫血 0~3岁儿童

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

页岩油压裂井产量预测方法研究

油气井测试 2024年第3期33卷 46-52页

作者：赵庆杰唐宏宝张乾冯凡郝华松白石中国石油集团渤海钻探工程公司井下技术服务公司天津300280 中国石油集团渤海钻探工程公司工程技术部天津300457 中国石油管道局工程有限公司第四分公司河北廊坊065000 中国石油集团渤海钻探工程有限公司油气井测试分公司河北廊坊065007

为了综合考虑地质因素和工程参数对页岩油压裂井产量的影响,以大港油田页岩油井为数据来源,利用Spearman相关系数和随机森林综合筛选关键特征参数,通过数据清洗、多重填补检测剔除异常值,拓展缺失数据,构建完整的压裂井产量预测数据集... 详细信息

为了综合考虑地质因素和工程参数对页岩油压裂井产量的影响,以大港油田页岩油井为数据来源,利用Spearman相关系数和随机森林综合筛选关键特征参数,通过数据清洗、多重填补检测剔除异常值,拓展缺失数据,构建完整的压裂井产量预测数据集。基于多层感知机神经网络模型,采用网格搜索法进行基础模型的参数调优,建立了页岩油压裂井产量预测模型,训练数据集的预测平均准确度为92.37%。经大港10口页岩油井的生产数据现场应用,预测产量与实际值的平均误差为7.59%,表明该产量预测模型可综合反应地质因素和工程参数对压裂井产量的影响,使预测结果与实际生产相吻合,预测精度高,满足工程需求。

关键词：页岩油压裂产量预测模型多层感知机神经网络现场试验大港油田特征参数

中英高校药学本科教育中有机化学课程的对比与思考

在线全文

学校读者我要写书评

暂无评论

化工设计通讯 2024年第8期50卷 83-85页

作者：盖聪昊柴晓云邹燕苏娟赵庆杰中国人民解放军海军军医大学药学系有机化学教研室上海200433 中国人民解放军海军军医大学军事药学实验教学示范中心上海200433

国内外药学学科的飞速发展需要具有创新能力和扎实理论基础兼备的专业应用型人才,有机化学作为重要的专业基础课程之一,目前以不同官能团为主线的有机化学教学模式存在些许不足,不利于药学专业学生对各类有机化学反应的理解和运用。为... 详细信息

国内外药学学科的飞速发展需要具有创新能力和扎实理论基础兼备的专业应用型人才,有机化学作为重要的专业基础课程之一,目前以不同官能团为主线的有机化学教学模式存在些许不足,不利于药学专业学生对各类有机化学反应的理解和运用。为了提高药学本科生对专业理论的学习效果,并提高他们在科研实践中的主观能动性,对比了中英两所高校(海军军医大学与英国纽卡斯尔大学)在有机化学教学中的侧重点,发现学生对基础有机化学理论的掌握,可以促进理论到实践的转化,有利于学生发展创新思维,满足当下大型医药企业的国际化发展对具有创新能力和扎实理论基础兼备的专业应用型人才的需求。

关键词：药学教育中英本科教育有机化学理论教育

Interactions between lead(Ⅱ) ions and dissolved organic matter derived from organic fertilizers incubated in the field

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第11期34卷 77-89页

作者： Long Chen Boling Li Zhipeng Wu qingjie zhao Qiuyue Wang Hailong Wang Bhupinder Pal Singh Weidong Wu Chuanliang Fu College of Tropical Crops Hainan UniversityHaikou 570228China School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China Department of Primary Industries Elizabeth Macarthur Agricultural InstituteMenangleNSW 2568Australia Institute of Agricultural Environment and Soil Hainan Academy of Agricultural SciencesHaikou 571100China Key Laboratory of Arable Land Conservation of Hainan Province Haikou 571100China

This work was to study composition characteristics and the subsequent effect on the lead(Pb) binding properties of dissolved organic matter(DOM) derived from seaweed-based(SWOF) and chicken manure organic fertilizers(CMOF) during a one-year field incubation experiment using the excitation-emission matrix-parallel factor(EEM-PARAFAC) and twodimensional correlation spectroscopy(2DCOS) analysis. Results showed that high aromatic and hydrophobic fluorescent substances were enriched in CMOF-derived DOM and SWOFderived DOM and enhanced over time. And phenolic groups in the fulvic-like substances for SWOF-derived DOM and carboxyl groups in the humic-like substances for CMOF-derived DOM had the fastest responses over time, respectively. Moreover, both non-fluorescent polysaccharides and fluorescent humic-like substances or fulvic-like substances with aromatic(C=C) groups first participated in the binding process of Pb to SWOF-derived DOM on day 0 and 180 during the lead binding process. In contrast, humic-like substances associated with aromatic(C=C) and phenolic groups gave a faster response to Pb binding on day 360. Regarding CMOF-derived DOM, the fulvic-like substances associated with aromatic(C=C) and carboxylic groups displayed a faster response to Pb ions on day 0. Nonetheless,polysaccharides and humic-like associated with phenolic groups had a faster response on days 180 and 360. It is noteworthy that the polysaccharides, which participated in Pb binding to CMOF-derived DOM, posed a higher risk of Pb in the environment after 360 days. Therefore, these findings gave new insights into the long-term applications of commercial organic fertilizers for the amendment of soil.

关键词： DOM Commercial organic fertilizer Parallel factor analysis Two-dimensional correlation spectroscopy Lead(Pb)