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发酵风味辣酱的研制
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作者 骆扬 董富 赵阳 《农产品加工》 2024年第5期26-30,36,共6页
以云南文山县丘北小米辣为原料,打碎磨浆,添加食盐、白砂糖、白酒、生姜、大蒜,于25℃室温下进行发酵。通过添加辅料虾皮、海带、花生粉、香菇提升辣椒酱风味。通过单因素试验和正交试验表明,小米辣用量100 g,白酒用量6 g,食盐用量10 g... 以云南文山县丘北小米辣为原料,打碎磨浆,添加食盐、白砂糖、白酒、生姜、大蒜,于25℃室温下进行发酵。通过添加辅料虾皮、海带、花生粉、香菇提升辣椒酱风味。通过单因素试验和正交试验表明,小米辣用量100 g,白酒用量6 g,食盐用量10 g,白砂糖用量7 g,发酵18 d,发酵后每100 g辣酱添加海带5 g,虾皮7 g,花生9 g,香菇8 g,制作出的风味辣椒酱颜色鲜亮,具有辣椒酱应有的红褐色,香辣味较浓郁,且伴随辅料风味。 展开更多
关键词 丘北小米辣 发酵 调味辣椒酱
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Heterojunction-engineered carrier transport in elevated-metal metal-oxide thin-film transistors
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作者 Xiao Li Zhikang Ma +6 位作者 Jinxiong Li Wengao Pan Congwei Liao Shengdong Zhang Zhuo Gao dong fu Lei Lu 《Journal of Semiconductors》 EI CAS CSCD 2024年第10期54-59,共6页
This study investigates the carrier transport of heterojunction channel in oxide semiconductor thin-film transistor(TFT)using the elevated-metal metal-oxide(EMMO)architecture and indium−zinc oxide(InZnO).The heterojun... This study investigates the carrier transport of heterojunction channel in oxide semiconductor thin-film transistor(TFT)using the elevated-metal metal-oxide(EMMO)architecture and indium−zinc oxide(InZnO).The heterojunction band diagram of InZnO bilayer was modified by the cation composition to form the two-dimensional electron gas(2DEG)at the interface quantum well,as verified using a metal−insulator−semiconductor(MIS)device.Although the 2DEG indeed contributes to a higher mobility than the monolayer channel,the competition and cooperation between the gate field and the built-in field strongly affect such mobility-boosting effect,originating from the carrier inelastic collision at the heterojunction interface and the gate field-induced suppression of quantum well.Benefited from the proper energy-band engineering,a high mobility of 84.3 cm2·V^(−1)·s^(−1),a decent threshold voltage(V_(th))of−6.5 V,and a steep subthreshold swing(SS)of 0.29 V/dec were obtained in InZnO-based heterojunction TFT. 展开更多
关键词 oxide semiconductor thin-film transistors two-dimensional electron gas HETEROJUNCTION high mobility
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江淮流域暖切变型暖区暴雨的客观识别与分析
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作者 宋柳贤 张玲 +2 位作者 马茜雅 董甫 智协飞 《大气科学》 CSCD 北大核心 2023年第6期1709-1722,共14页
暖切变型暖区暴雨(WSWR)是存在暖式切变线作为天气背景的暖区暴雨(WR)类型。本研究基于WR与切变线的定义,综合中尺度暴雨团、锋面、切变线等客观识别标准,利用中国自动站与CMORPH降水产品融合的逐小时网格数据集以及ERA5再分析资料对201... 暖切变型暖区暴雨(WSWR)是存在暖式切变线作为天气背景的暖区暴雨(WR)类型。本研究基于WR与切变线的定义,综合中尺度暴雨团、锋面、切变线等客观识别标准,利用中国自动站与CMORPH降水产品融合的逐小时网格数据集以及ERA5再分析资料对2010~2017年的江淮流域WSWR进行客观识别与验证。8年共确定WR雨团1268个,WSWR雨团451个,其高频区位于皖赣鄂三省交界处及江浙沿海区域,且WSWR雨团与WR雨团的频次大值区分布基本一致。WSWR雨团多出现在6月中旬到7月中旬,此期间WR雨团中40%以上是WSWR雨团,雨团出现的位置随主雨带一致向北推进,其平均最大降水量为29 mm h^(-1)。WSWR出现频次的日变化呈现双峰结构,分别出现在08~13时(北京时,下同)、20~22时,雨团的小时降水量高峰值主要出现在午后(13~19时)和清晨(01~05时)。 展开更多
关键词 暖区暴雨 暖切变 江淮流域 客观识别
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基于不同微物理过程的广西沿海南风型暖区暴雨的数值模拟研究 被引量:15
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作者 智协飞 董甫 +2 位作者 张玲 吉璐莹 朱寿鹏 《大气科学学报》 CSCD 北大核心 2020年第5期867-879,共13页
基于WRFV3.6.1,利用其8个云微物理参数化方案对2010—2016年华南汛期(4—9月)的6个南风型暖区暴雨个例进行数值模拟与多方案集成试验,并采用基于对象的诊断评估方法(MODE)对模拟结果进行评估。结果发现对于大多数个例,WRF模式都能较好... 基于WRFV3.6.1,利用其8个云微物理参数化方案对2010—2016年华南汛期(4—9月)的6个南风型暖区暴雨个例进行数值模拟与多方案集成试验,并采用基于对象的诊断评估方法(MODE)对模拟结果进行评估。结果发现对于大多数个例,WRF模式都能较好地模拟出暖区暴雨的降水带,对暖区降水带模拟最好的参数化方案是WSM6方案,其次是Lin方案;模拟效果较差的参数化方案为CAM5.1与NSSL 2-mon方案。选取模拟结果较好的个例进行诊断分析,发现不同参数化方案得到的动力学特征以及云微物理特征相关变量存在较大差异,导致模拟降水的差异。在单方案模拟的基础上,开展多方案集成试验,发现多方案集成方法能够有效降低模式模拟的不确定性,产生更稳定的模拟结果。 展开更多
关键词 WRF模式 云微物理参数化方案 暖区暴雨 MODE
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静水压力交变对高强度船体钢腐蚀行为的影响 被引量:4
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作者 胡裕龙 王智峤 +2 位作者 赵欣 董赋 梅志远 《海军工程大学学报》 CAS 北大核心 2018年第5期69-75,共7页
采用管形薄壁试样模拟密封结构,通过管形试样的应力状态计算、管形试样和相同尺寸实心圆柱试样的对比腐蚀实验,研究了静水压力交替变化对高强度船体钢在质量百分数为3.5%NaCl溶液中腐蚀行为的影响。结果表明:静水压力交替变化引起的溶... 采用管形薄壁试样模拟密封结构,通过管形试样的应力状态计算、管形试样和相同尺寸实心圆柱试样的对比腐蚀实验,研究了静水压力交替变化对高强度船体钢在质量百分数为3.5%NaCl溶液中腐蚀行为的影响。结果表明:静水压力交替变化引起的溶液中溶解氧变化影响了高压时的电化学过程以及金属表面形成的腐蚀产物,可降低恢复到常压后的金属的腐蚀速度;静水压力交替变化引起了管形薄壁试样表面的应力、应变变化,高压时试样表面的应力增大可明显促进金属的腐蚀,另外,应力、应变的交替变化改变了金属/腐蚀产物的界面性能,显著促进了金属在常压时的腐蚀。在4 MPa静水压力下,管形试样管壁表面产生30.5~34.5MPa的压应力,静水压力交替变化可使金属腐蚀速度增大20%以上。 展开更多
关键词 静水压力交变 管形试样 高强度船体钢 应力
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基于宽窄平台相结合的黄土高边坡优化设计——以陕西省子长市某工业广场高边坡为例 被引量:2
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作者 南宁 李鹏 +2 位作者 苏生瑞 董福 马驰 《煤田地质与勘探》 CAS CSCD 北大核心 2022年第6期155-164,共10页
山区或丘陵地带建设煤矿工业广场时将面临高边坡问题,不合理的高边坡设计严重浪费土地资源,造成环境破坏和投资增加,也为基础设施带来巨大安全隐患。基于此,以陕西省子长市某煤矿工业广场高边坡为例,借助现场调查、理论分析和数值模拟... 山区或丘陵地带建设煤矿工业广场时将面临高边坡问题,不合理的高边坡设计严重浪费土地资源,造成环境破坏和投资增加,也为基础设施带来巨大安全隐患。基于此,以陕西省子长市某煤矿工业广场高边坡为例,借助现场调查、理论分析和数值模拟等手段,综合考虑边坡抗冲刷性和整体稳定性,探讨不同数量、位置和宽度的宽平台对高边坡的应力、应变场和稳定性系数的影响规律,结合模型的开挖量,选取满足稳定性要求且开挖量最少的最优坡形。结果显示:陕北地区粉黄土高边坡最优单坡坡率为1∶0.75,坡高5~6 m;宽平台能改变潜在滑移面位置,当宽平台位于坡脚或坡顶时,潜在滑移面分布以宽平台位置为界,分布于宽平台以上或以下边坡;当宽平台连续分布且宽度较大时,高边坡可视为2个独立边坡来分析计算;高边坡最优坡形为:30 m高边坡单坡高5 m、坡率1∶0.75,窄平台宽度3 m,布置2个宽平台、位置③⑤、宽度10 m;50 m高边坡单坡高5 m、坡率1∶0.75,窄平台宽度3 m,布置4个宽平台、位置③⑤⑧⑨、宽度14 m。宽窄平台优化组合方式可为陕北地区粉黄土高边坡设计和防护工作提供理论依据和实际指导。 展开更多
关键词 高边坡 粉黄土 宽窄平台 优化设计 抗冲刷 稳定性
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浅谈动物实验艾条灸的刺激量 被引量:7
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作者 董富 祁晓晗 杜艳军 《上海针灸杂志》 2018年第3期359-362,共4页
艾灸疗法是针灸疗法中的重要组成部分,主要是通过温热、艾烟、红外线等刺激腧穴来调整经络脏腑功能以达到防病治病的目的。近年来,有关艾灸防治疾病的效应研究取得了较大进展,然而艾灸刺激量的具体应用却各有不同,影响了艾灸效应的优化... 艾灸疗法是针灸疗法中的重要组成部分,主要是通过温热、艾烟、红外线等刺激腧穴来调整经络脏腑功能以达到防病治病的目的。近年来,有关艾灸防治疾病的效应研究取得了较大进展,然而艾灸刺激量的具体应用却各有不同,影响了艾灸效应的优化选择。该文拟从艾灸刺激量之艾条直径、艾灸距离、时间、频率等方面综述艾灸方法在动物实验中的具体应用,探讨实验研究中艾灸刺激量相对统一的重要性。 展开更多
关键词 灸法 刺激量 实验研究 综述
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基于WRF模式的强天气过程集合预报综述 被引量:2
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作者 董甫 张玲 +2 位作者 张海鹏 李佳 宋柳贤 《干旱气象》 2020年第5期699-708,共10页
集合预报作为减小数值模式不确定性的有效手段,已经较为广泛应用于强降水和强对流等强天气过程的数值天气预报中。本文根据国内外WRF模式集合预报的研究进展,从模式初始场的改进、集合预报扰动方法的构建以及对流尺度集合预报的发展等... 集合预报作为减小数值模式不确定性的有效手段,已经较为广泛应用于强降水和强对流等强天气过程的数值天气预报中。本文根据国内外WRF模式集合预报的研究进展,从模式初始场的改进、集合预报扰动方法的构建以及对流尺度集合预报的发展等三方面进行了回顾与总结。结果表明:资料同化技术能为大尺度模式初始场提供中小尺度信息,利于提高强天气过程的预报能力。构建合理的多初值、多边界、多物理过程扰动能够较为准确地表征大气演变的不确定性,提高集合预报离散度,其预报结果通常优于确定性预报。对流尺度集合预报能够更好地模拟强天气过程,但如何发展适用于对流尺度集合预报的扰动方法及评估方法是当前对流尺度集合预报发展的难题。 展开更多
关键词 集合预报 WRF模式 强天气过程 对流尺度
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A three-dimensional digital visualization model of cervical nerves in a healthy person 被引量:1
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作者 Jiaming Cao dong fu Sen Li 《Neural Regeneration Research》 SCIE CAS CSCD 2013年第20期1829-1836,共8页
Three-dimensional reconstruction nerve models are classically obtained from two-dimensional images of "visible human" frozen sections. However, because of the flexibility of nerve tissues and small color differences... Three-dimensional reconstruction nerve models are classically obtained from two-dimensional images of "visible human" frozen sections. However, because of the flexibility of nerve tissues and small color differences compared with surrounding tissues, the integrity and validity of nerve tissues can be impaired during milling. Thus, in the present study, we obtained two-dimensional data from a healthy volunteer based on continuous CT angiography and magnetic resonance myelography. Semi-automatic segmentation and reconstruction were then conducted at different thresholds in different tissues using Mimics software. Small anatomical structures such as muscles and cervical nerves were reconstructed using the medical computer aided design module. Three-dimensional digital models of the cervical nerves and their surrounding structures were successfully developed, which allowed visualization of the spatial relation of anatomical structures with a strong three-dimensional effect, distinct appearance, clear distribution, and good continuity, precision, and integrality. These results indicate the validity of a three-dimensional digital visualization model of healthy human cervical nerves, which overcomes the disadvantages of milling, avoids data loss, and exhibits a realistic appearance and three-dimensional image. 展开更多
关键词 neural regeneration CERVICAL THREE-DIMENSION CT magnetic resonance myelography cervical plexus phrenic nerve vagus nerve recurrent laryngeal nerve GANGLION stellate ganglion grants-supported paper NEUROREGENERATION
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禾草沟煤矿排矸场地下水渗流规律与盲沟疏排效果研究
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作者 董福 苏生瑞 +2 位作者 朱涛 姜海波 吕远强 《河南科学》 2021年第2期303-313,共11页
基于煤矿排矸场地下水疏排设计以及排矸场的安全运行,以陕西省延安市禾草沟煤矿排矸场为研究对象,采用室内实验和数值模拟方法进行物性试验,得到该处煤矸石的含水率、密度、粒径级配以及渗透系数.借助数值模拟软件对降雨条件下的煤矸石... 基于煤矿排矸场地下水疏排设计以及排矸场的安全运行,以陕西省延安市禾草沟煤矿排矸场为研究对象,采用室内实验和数值模拟方法进行物性试验,得到该处煤矸石的含水率、密度、粒径级配以及渗透系数.借助数值模拟软件对降雨条件下的煤矸石堆积体中地下水的渗流特征以及盲沟对地下水的疏排效果和影响范围进行分析,研究盲沟对煤矸石堆积体中地下水渗流特征的影响规律,评价盲沟的疏排效果及影响范围,建立了一套盲沟排泄效果评价体系.结果认为,当水流能够到达盲沟的直接影响范围内后(约30 m),盲沟可以很好地将水分排出堆积体,而且随着降雨强度逐渐增大,盲沟具备优秀排泄效率所占的比例越大. 展开更多
关键词 煤矿排矸场 降雨强度 盲沟 数值模拟 疏排效果
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近5年灸法治疗中风后尿失禁的文献分析 被引量:3
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作者 董富 《中国民间疗法》 2022年第5期54-58,共5页
目的:分析近5年灸法治疗中风后尿失禁的相关文献,探讨治疗中风后尿失禁主要灸法及穴位.方法:检索中英文数据库自2016年1月1日至2021年3月15日灸法治疗中风后尿失禁的相关文献,从治疗方法、选穴概况、作用机制进行分析、归纳、总结.结果... 目的:分析近5年灸法治疗中风后尿失禁的相关文献,探讨治疗中风后尿失禁主要灸法及穴位.方法:检索中英文数据库自2016年1月1日至2021年3月15日灸法治疗中风后尿失禁的相关文献,从治疗方法、选穴概况、作用机制进行分析、归纳、总结.结果:最终获得中文文献40篇.主要灸法包括艾条灸、隔物灸和温针灸,艾条灸主要包括温和灸和热敏灸,应用频次前5位的腧穴分别为关元、气海、神阙、中极、三阴交.结论:关于灸法治疗中风后尿失禁作用机制的文献较少,尚有待进一步研究. 展开更多
关键词 中风后尿失禁 灸法 艾条灸 隔物灸 温针灸 文献分析
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基于增强现实技术的高压断路器检修应用研究
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作者 李星宇 汪祝年 +1 位作者 陈通 董龑 《电力系统装备》 2021年第23期109-110,共2页
电网设备是我国庞大的电网系统的重要组成部分,在电网设备中,高压断路器主要负责对电网进行保护和实现开断功能,高压断路器的稳定运行直接关系电网是否正常供电。随着我国科技水平的不断提升,在电网方面要求越来越多地使用智能化监测设... 电网设备是我国庞大的电网系统的重要组成部分,在电网设备中,高压断路器主要负责对电网进行保护和实现开断功能,高压断路器的稳定运行直接关系电网是否正常供电。随着我国科技水平的不断提升,在电网方面要求越来越多地使用智能化监测设施,来保证电网中设备的正常工作和对电网设备状态的检测。高压断路器的主要故障一般是由于其操作机构产生的机械故障使其不能够正常工作。通过对增强现实技术的关键技术介绍,展开基于增强现实技术在日常高压断路器巡检中的应用研究,在掌握高压断路器的运行状态和运行情况后,整合其相关参数状态数据,实现将增强现实技术应用到电力巡检中,减轻一线巡检工作人员的工作压力,提高其工作的安全性和高效性。 展开更多
关键词 电网设备 高压断路器 增强现实技术
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Evaluation of Burden Descent Model for Burden Distribution in Blast Furnace 被引量:4
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作者 Ping ZHOU Peng-yu SHI +3 位作者 Yan-po SONG Kai-le TANG dong fu Chenn Q.ZHOU 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第8期765-771,共7页
Mathematical models for burden descending process have been applied to obtain whole burden structures in blast furnace,whereas the accuracy of those burden descent models has not been sufficiently investigated.Special... Mathematical models for burden descending process have been applied to obtain whole burden structures in blast furnace,whereas the accuracy of those burden descent models has not been sufficiently investigated.Special evaluation method based on timeline burden profiles was established to quantitatively evaluate the error between experimental and modeled burden structures.Four existing burden descent models were utilized to describe the burden structure of a 1/20 scaled warm blast furnace.Input modeling conditions including initial burden profile,descending volumes in each time interval,and normalized descending velocity distribution were determined via special image processing technology.Modeled burden structures were evaluated combined with the published experimental data.It is found that all the models caught the main profile of the burden structure.Furthermore,the improved nonuniform descent model(Model IV)shows the highest level of precision especially when burden descends with unstable velocity distribution tendency.Meanwhile,the traditional nonuniform descent model(Model III)may also be desirable to model the burden descending process when the burden descending velocity presents a linear tendency.Finally,the uniform descent model(Model I)might be the first option for roughly predicting burden structure. 展开更多
关键词 burden descending descent normalized utilized scaled sufficiently modeled desirable quantitatively
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Operando reconstruction-induced CO_(2)reduction activity and selectivity for cobalt-based photocatalysis 被引量:1
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作者 Kun Zhao Weiying Pang +10 位作者 Shuaiyu Jiang Canyu Hu Porun Liu Dandan Cui Xuefei An Baojuan Tian Chao Gao Pan Zhang Meng Tian dong fu Huijun Zhao 《Nano Research》 SCIE EI CSCD 2023年第4期4812-4820,共9页
The oxygen atom coordination inducing the structure reconstruction of the catalytic site is identified and recognized ambiguously,which is related to accurately declare the mechanism in a dynamic catalytic process.Her... The oxygen atom coordination inducing the structure reconstruction of the catalytic site is identified and recognized ambiguously,which is related to accurately declare the mechanism in a dynamic catalytic process.Herein,we demonstrated that the reconstructed catalytic sites would lead to a remarkable performance for photocatalytic CO_(2)reduction.At the initial 4-cycles testing,the in-situ formation of CoOx active sites on the Co(CoP)surface performed an increasing transient activity and selectivity toward CO evolution.The formation of reconstructive Co-O bond and the appearance of intermediate specie CO were simultaneously observed by the pre-operando Raman,revealing the dynamic relationship between catalytic site structure and the photocatalytic properties.Moreover,density functional theory calculations showed that the electronic structure of the reconstructive surface sites could modulate the ability of CO_(2)adsorption and CO desorption.The reduced barrier energy for the rate-determining step finally improved the activity and selectivity of CO_(2)reduction. 展开更多
关键词 surface reconstruction unsaturated Co-Ox catalytic site balanced relationship photocatalytic CO_(2)reduction
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Human neural stem cell-derived extracellular vesicles protect against ischemic stroke by activating the PI3K/AKT/mTOR pathway
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作者 Jiayi Wang Mengke Zhao +5 位作者 dong fu Meina Wang Chao Han Zhongyue Lv Liang Wang Jing Liu 《Neural Regeneration Research》 SCIE CAS 2025年第11期3245-3258,共14页
Human neural stem cell-derived extracellular vesicles exhibit analogous functions to their parental cells,and can thus be used as substitutes for stem cells in stem cell therapy,thereby mitigating the risks of stem ce... Human neural stem cell-derived extracellular vesicles exhibit analogous functions to their parental cells,and can thus be used as substitutes for stem cells in stem cell therapy,thereby mitigating the risks of stem cell therapy and advancing the frontiers of stem cell-derived treatments.This lays a foundation for the development of potentially potent new treatment modalities for ischemic stroke.However,the precise mechanisms underlying the efficacy and safety of human neural stem cell-derived extracellular vesicles remain unclear,presenting challenges for clinical translation.To promote the translation of therapy based on human neural stem cell-derived extracellular vesicles from the bench to the bedside,we conducted a comprehensive preclinical study to evaluate the efficacy and safety of human neural stem cell-derived extracellular vesicles in the treatment of ischemic stroke.We found that administration of human neural stem cell-derived extracellular vesicles to an ischemic stroke rat model reduced the volume of cerebral infarction and promoted functional recovery by alleviating neuronal apoptosis.The human neural stem cell-derived extracellular vesicles reduced neuronal apoptosis by enhancing phosphorylation of phosphoinositide 3-kinase,mammalian target of rapamycin,and protein kinase B,and these effects were reversed by treatment with a phosphoinositide 3-kinase inhibitor.These findings suggest that human neural stem cell-derived extracellular vesicles play a neuroprotective role in ischemic stroke through activation of phosphoinositide 3-kinase/protein kinase B/mammalian target of rapamycin signaling pathway.Finally,we showed that human neural stem cell-derived extracellular vesicles have a good in vivo safety profile.Therefore,human neural stem cell-derived extracellular vesicles are a promising potential agent for the treatment of ischemic stroke. 展开更多
关键词 behavior exosome extracellular vesicles ischemic stroke mammalian target of rapamycin(mTOR) middle cerebral artery occlusion neural stem cells neuronal apoptosis phosphoinositide 3-kinase(PI3K) protein kinase B(AKT)
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长江中游地区PM_(2.5)重污染过程的典型天气环流分型及区域传输影响 被引量:9
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作者 王莹 智协飞 +2 位作者 白永清 董甫 张玲 《环境科学》 EI CAS CSCD 北大核心 2022年第8期3913-3922,共10页
作为一个新的区域性霾污染中心,长江中游地区地理位置特殊,是我国中东部地区大气污染物区域传输的重要枢纽,天气环流对该区域不同传输和累积型PM_(2.5)重污染的形成机制还不甚了解.利用T-mode斜交旋转主成分分析法(PCT),对2015~2019年... 作为一个新的区域性霾污染中心,长江中游地区地理位置特殊,是我国中东部地区大气污染物区域传输的重要枢纽,天气环流对该区域不同传输和累积型PM_(2.5)重污染的形成机制还不甚了解.利用T-mode斜交旋转主成分分析法(PCT),对2015~2019年采暖季长江中游地区74 d PM_(2.5)重污染事件进行天气环流分型,得到:PCT1高压底部传输型(天数:41 d,占比:55.4%)、PCT2低压辐合累积型(天数:12 d,占比:16.2%)、PCT3高压静稳累积型(天数:11 d,占比:14.9%)和PCT4高压后部传输型(天数:10 d,占比:13.5%)这4种主要的大气环流类型.区域传输型污染(PCT1和PCT4)占比高达69%,是长江中游地区PM_(2.5)重污染发生的主导因素,突显了地域特殊性.其中,PCT1是最主要的环流型,冷锋南侵伴随强偏北风驱动上游地区污染物快速传输,使得PM_(2.5)浓度暴发式增长.境内传输通道城市襄阳、荆门和荆州PM_(2.5)传输过程具有12 h滞后特征,其PM_(2.5)影响源区主要分布在上游的河南中北部、山东西部和华北大部分地区.PCT4传输型受低层偏东风输送影响,污染上升速率也相对较快.PCT2和PCT3为静稳天气环流型,地面风速较小,低层水平辐合和下沉运动有利本地PM_(2.5)重污染累积,污染上升速率和持续时间都相对传输型更长. 展开更多
关键词 PM_(2.5) 长江中游地区 区域传输 T-mode斜交旋转主成分分析法(PCT) 环流分型
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Electron Probe Microanalysis of Monazite and Its Applications to U-Th-Pb Dating of Geological Samples 被引量:9
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作者 Wenbin Ning Junpeng Wang +3 位作者 Deng Xiao Fenfang Li Bo Huang dong fu 《Journal of Earth Science》 SCIE CAS CSCD 2019年第5期952-963,共12页
Electron probe microanalysis(EPMA) dating of monazite has been developed over decades. However, limited by the detectability and analytical sensitivity of dating-related elements(Th, Pb, U and Y), the EPMA dating has ... Electron probe microanalysis(EPMA) dating of monazite has been developed over decades. However, limited by the detectability and analytical sensitivity of dating-related elements(Th, Pb, U and Y), the EPMA dating has been restricted to geological research. In this study, various probe currents, beam diameters and counting times have been utilized on a JEOL JXA-8230 electron microprobe to determine the optimal experimental conditions for measuring Th, Pb, U and Y in monazite. The optimal conditions are:(1) accelerating voltage is 15 k V;(2) probe current is 100 n A;(3) beam diameter is 1 μm;(4) the peak and background counting time of U and Pb are 200 and 100 s;and(5) the peak and background counting time of Th and Y are 100 and 50 s. We apply this method to monazite from garnet-bearing biotite gneiss in the Zanhuang area of the Central Orogenic Belt of the North China Craton. The Pb O-Th O2* isochron age calculated by EPMA data is 1 812±17 Ma(MSWD=2.06), which is similar to the weighted mean 207 Pb/206 Pb age(1 805±12 Ma, MSWD=1.07) obtained by LA-ICP-MS. This study suggests that EPMA dating of monazite as a powerful dating technique can be widely used in geochronological study. 展开更多
关键词 MONAZITE EPMA DATING garnet-bearing BIOTITE GNEISS Zanhuang area North China CRATON geochemistry
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Biochar for the removal of contaminants from soil and water:a review 被引量:19
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作者 Muqing Qiu Lijie Liu +6 位作者 Qian Ling Yawen Cai Shujun Yu Shuqin Wang dong fu Baowei Hu Xiangke Wang 《Biochar》 SCIE 2022年第1期864-888,共25页
Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics.This r... Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics.This review aims to highlight biochar production technologies,characteristics of biochar,and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and water.Pyrolysis temperature,heat transfer rate,residence time,and type of feedstock are critical influential parameters.Biochar’s efficacy in managing contaminants relies on the pore size distribution,surface groups,and ion-exchange capacity.The molecular composition and physical architecture of biochar may be crucial when practically applied to water and soil.In general,biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area,hydrophobicity and microporosity.Biochar generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups,precipitation and electrostatic attraction.This review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil. 展开更多
关键词 BIOCHAR Heavy metal ions Organic pollutants WATER SOIL
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Isotope Chronology and Geochemistry of the Lower Carboniferous Granite in Xilinhot, Inner Mongolia, China 被引量:9
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作者 Xiaocheng Zhao Wenxiao Zhou +2 位作者 dong fu Bo Huang Mengchun Ge 《Journal of Earth Science》 SCIE CAS CSCD 2018年第2期280-294,共15页
Geochronological and geochemical analyses were performed on K-feldspar granites and monzonitic granites from the Xilinhot area, Inner Mongolia, China. Zircon U/Pb ages indicate that the two types granites were emplace... Geochronological and geochemical analyses were performed on K-feldspar granites and monzonitic granites from the Xilinhot area, Inner Mongolia, China. Zircon U/Pb ages indicate that the two types granites were emplaced during the Lower Carboniferous. The K-feldspar granites (332 Ma) have the typical A-type granite characteristics of a post-collision setting. The monzonitic granites have an emplacement age of 323 Ma. Zircon tHf values of the former range from +12.8 to +14.2, with an av- erage TDM2 of 453 Ma. The latter have lower zircon ~Hf values, ranging from +5.4 to +10.7, with an av- erage TDM2 of 798 Ma. The strong, positive ~nf values of the zircon indicate that both sets of samples are from a juvenile crust formed in an oceanic crust subduction stage, although the monzonitic granite may have undergone a hybridization of crustal materials. These results indicate a younger post orogenic event. The Paleo-Asian Ocean had closed before the Early Carboniferous and the Xilinhot area started its post-orogenic evolution with an extensional tectonic environment durin~ the Early Carboniferous. 展开更多
关键词 Lower Carboniferous granite Paleo-Asian Ocean Lu-Hf isotope XiUnhot Inner Mongolia.
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改性呼吸图法一步制备2D微半球结构
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作者 程皓鸽 朱旭 +3 位作者 付冬 张馨月 魏浩 马宁 《高分子学报》 SCIE CAS CSCD 北大核心 2019年第4期393-401,共9页
通过引入预相分离过程对传统呼吸图法过程进行改进,改变了PEG在聚合物共混溶液中的初始分布,从而以一步法制备出含有2D微半球结构的聚合物微结构薄膜.通过设计预相分离时间分别为10、20及30 min,PEG的分子量为2000、6000及10000,不同PE... 通过引入预相分离过程对传统呼吸图法过程进行改进,改变了PEG在聚合物共混溶液中的初始分布,从而以一步法制备出含有2D微半球结构的聚合物微结构薄膜.通过设计预相分离时间分别为10、20及30 min,PEG的分子量为2000、6000及10000,不同PEG分子的含量配比为1:9、2:8及3:7,以及小分子量PS18000的引入,探讨了制备条件的改变对微结构的形貌及尺寸的影响,并详细分析了条件对于微结构影响的原因.最终设定预相分离时间为10 min、PEG分子配比为3:7及使用小分子PS18000,通过一步法制备含有较多2D微半球结构.该制备方法将为快速、大面积地制备2D微半球结构提供一种新思路. 展开更多
关键词 呼吸图法 聚合物相分离 2D微半球
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