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Drying and preheating processes of iron ore pellets in a traveling grate

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 535-540页

作者： Jun-xiao Feng Yu Zhang Hai-wei zheng xiao-yan Xie Cai Zhang School of Mechanical Engineering University of Science and Technology B~ijing Beijing 100083 China

A mathematical model of drying and preheating processes in a traveling grate was presented based on the laws of mass, momen- tum, heat transfer, and drying semiempirical relations. A field test was systematically carried out in a traveling grate. The effects of pellet diameter, moisture, grate velocity, and inlet gas temperature on the pellet bed temperature were studied. The average relative error between actual measurements and simulations is less than 7.97%, indicating the validity of the model.

关键词： iron ores pelletizing drying preheating numerical methods field test

Conformation Disturbance of CopC by α-Naphthylamine

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Chemical Research in Chinese Universities 2009年第3期25卷 269-272页

作者： LI Hui-qing zheng xiao-yan ZHAO Ya-qin yanG Bin-sheng Institute of Molecular Science Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Shanxi University Taiyuan 030006 P. R. China

It is known that urea and guanidine hydrochloride（GuHC1） induce conformational change of proteins in a certain range of molar ratios. In our research, a-naphthylamine（NA） above 10^-4 mol/L at pH 7.0 was discovered to perturb the conformation of CopC, a copper resistant protein with a Greek fl-barrel motif; this was reflected by the greater fluorescence quenching and red-shifted emission peak of CopC. The conformation change of CopC was also verified in acrylamide collision experiment by comparing quenching levels of CopC in the presence or the abscence of NA. Comparison of emission change of CopC-Cu^2＋ with that of apo-CopC showed a consistent result with their denaturation in GuHCl. And decreasing fluorescence polarization of CopC with increasing NA concentration is consistent with a more extend conformation of CopC. Interaction mechanism was also explored.

关键词： α-Naphthylamine(NA) CopC Conformational change

Immediate Effect of Electro-acupuncture on Endometrial Blood Flow in Patients with Recurrent Implantation Failure:A Randomized Controlled Trial

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Chinese Journal of Integrative Medicine 2024年第4期30卷 291-298页

作者： LAI Yuan-yuan LIU Li-ying WU Yong-na HUANG Lei zheng xiao-yan GAN Di YU Si-yi ZHONG Ying LIANG Fan-rong ZHOU Ying yanG Jie Acupuncture and Tuina School Chengdu University of Traditional Chinese MedicineChengdu(610032)China Sichuan Jinxin Xi'nan Women's and Children's Hospital Chengdu(610032)China Yuan TCM Wellness Pte.Ltd.(999002) Pulse TCM SingaporeSingapore

Objective To investigate the immediate effects of electro-acupuncture(EA)on endometrial blood flow among recurrent implantation failure(RIF)*** Eighty RIF patients,enrolled from March 2022 to December 2022,were randomly allocated into either the EA group(40 cases)or the waiting-list(WL)group(40 cases)by using a random number *** EA group underwent acupuncture at points of Shenting(GV 24),Baihui(GV 4),Benshen(GB 13),bilateral Zigong(EX-CA 1),Huangshu(KI 16),Sanyinjiao(SP 6)and Xuehai(SP10),and electric acupuncture apparatus was connected to EX-CA 1,KI 16,SP 6,and SP 10 with disperse-dense waves at 4/20 Hz frequencies for 30 min after transvaginal ultrasound,while the WL group received no *** primary outcome measured was the endometrial volume blood *** secondary outcomes included the bilateral uterine artery index,endometrial volume,endometrial blood flow type,vascular distribution index(VI^(MV))for endometrial and ovary,clinical pregnancy rate,and embryo implantation *** In the EA group,there was a notable decrease in the bilateral pulsatility index and a significant improvement in the endometrial blood flow type post-EA(P0.05).Besides,no adverse events related to EA were *** EA can promptly ameliorate VI^(MV) for the endometrial and right ovary,and endometrial blood flow *** randomized controlled trials are warranted to investigate the long-term effects of EA on blood flow of RIF patients and its implications for pregnancy outcomes.(Trial registration ***2200057377

关键词： electro-acupuncture recurrent implantation failure transvaginal ultrasound endometrial receptivityanalysis randomized controlledtrial

超高效液相色谱-串联质谱法同时测定食品中碱性橙、碱性嫩黄O和碱性桃红T

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分析科学学报 2009年第4期25卷 409-413页

作者：郑小严福建省中心检验所福建福州350002

本文建立了同时测定食品中碱性橙、碱性嫩黄O和碱性桃红的超高效液相色谱-串联质谱（UPLC～MS／MS）检测方法。样品经碱化甲醇提取、二氯甲烷萃取、浓缩、酸化甲醇溶解和甲醇饱和正己烷溶液萃取净化后进行测定。本方法检出限分别为碱性... 详细信息

本文建立了同时测定食品中碱性橙、碱性嫩黄O和碱性桃红的超高效液相色谱-串联质谱（UPLC～MS／MS）检测方法。样品经碱化甲醇提取、二氯甲烷萃取、浓缩、酸化甲醇溶解和甲醇饱和正己烷溶液萃取净化后进行测定。本方法检出限分别为碱性橙0．6μg／kg、碱性嫩黄O0．3μg／kg、碱性桃红T0．7μg／kg。六种食品样品的回收率为72．1％～91．1％，相对标准偏差（RSD）为2．4％～9．1％（n=6），三种染料在0．01～0．5μg／mL范围内呈良好的线性关系，线性回归系数r均大于0．9950。

关键词：超高效液相色谱-串联质谱法食品碱性橙碱性嫩黄O 碱性桃红T

固相萃取-气相色谱-串接质谱法测定化妆品中的人工合成硝基麝香类化合物

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分析科学学报 2012年第5期28卷 634-638页

作者：郑小严福建省产品质量检验研究院国家加工食品质量监督检验中心福建福州350002

建立了一种用于不同化妆品中5种硝基麝香含量的气相色谱-三重四极杆串联质谱联用检测方法。化妆品中的硝基麝香通过丙酮/正己烷混合液超声提取,提取液经过浓缩,以CNWBOND Si固相萃取柱净化。再由气相色谱-三重四极杆质谱联用仪检测,氘... 详细信息

建立了一种用于不同化妆品中5种硝基麝香含量的气相色谱-三重四极杆串联质谱联用检测方法。化妆品中的硝基麝香通过丙酮/正己烷混合液超声提取,提取液经过浓缩,以CNWBOND Si固相萃取柱净化。再由气相色谱-三重四极杆质谱联用仪检测,氘代二甲苯麝香内标法定量。该方法对化妆品中5种硝基麝香的加标回收率在85.81%～104.92%之间,相对标准偏差(RSD)不大于5.75%,检测限分别达到2.0～10.0μg/kg。方法选择性好,能有效消除复杂基体干扰,可作为常见化妆品中硝基麝香类化合物含量检测的确证方法。

关键词：气相色谱-三重四极杆串联质谱硝基麝香化妆品

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基于线性预测倒谱系数的地震相分析

地球物理学报 2016年第11期59卷 4266-4277页

作者：解滔郑晓东张? 中国石油勘探开发研究院北京100083 中国地震台网中心北京100045

本文借鉴语音识别技术中的线性预测倒谱系数(LPCC系数)特征参数提取方法对地震数据进行分解,这种方法的优点是:可以获得将子波和反射系数信息分离的地震语音特征参数,对地质现象边界具有较好的描述能力,使我们可以从不同维度更细致地观... 详细信息

本文借鉴语音识别技术中的线性预测倒谱系数(LPCC系数)特征参数提取方法对地震数据进行分解,这种方法的优点是:可以获得将子波和反射系数信息分离的地震语音特征参数,对地质现象边界具有较好的描述能力,使我们可以从不同维度更细致地观察隐藏在地震数据中的地质特征.理论模型分析表明,基于LPCC系数的地震分析具有较高的地震相划分能力.实际地震资料应用表明,LPCC系数对储层特征的描述比常规三瞬属性更为细致,不同阶次LPCC系数在描述储层不同特征时也保持了内在的联系.采用K均值聚类方法对提取的12阶和24阶LPCC系数进行聚类分析,聚类结果与目的层段古地形较为吻合,较好地反映了研究区的断裂、礁滩相带、深水扇和储层的分布特征,说明在地震相分析中采用LPCC系数作为特征参数是可行和有效的.

关键词：线性预测倒谱系数地震相分析储层预测 K均值聚类语音识别

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稀疏数据源频繁模式挖掘并行算法

天津大学学报 2011年第4期44卷 353-358页

作者：郑晓艳孙济洲天津大学计算机科学与技术学院天津300072 天津职业技术师范大学信息技术工程学院天津300222

针对频繁模式挖掘中一类特殊的稀疏数据源,设计了一种链表结构体FI-list,并据此提出一个并行搜索频繁项集(PMFSD)的算法.该方法基于一个分布式共享内存系统——面向视图的分布式集群计算(VODCA)而设计.详细描述了链表结构体FI-list的设... 详细信息

针对频繁模式挖掘中一类特殊的稀疏数据源,设计了一种链表结构体FI-list,并据此提出一个并行搜索频繁项集(PMFSD)的算法.该方法基于一个分布式共享内存系统——面向视图的分布式集群计算(VODCA)而设计.详细描述了链表结构体FI-list的设计和构建过程,论述了在VODCA上挖掘稀疏数据源频繁模式的问题中,视图的划分依据及划分结果,讨论了算法实现的动态任务分配策略.实验结果证明了PMFSD算法的正确性和有效性.

关键词：频繁模式挖掘稀疏数据源面向视图的分布式集群计算视图划分链表

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多态交通条件下交叉口定时控制延误模型

系统工程理论与实践 2012年第5期32卷 1091-1097页

作者：丁恒陈无畏郑小燕马晓合肥工业大学交通运输工程学院合肥230009 合肥工业大学机械与汽车工程学院合肥230009

延误是评价交叉口服务水平的基本指标,延误模型对交叉口信号控制方案的选择意义重大.在多态交通条件下,采用现有模型分析信号控制下交叉口延误程度存在较大误差.为适应交叉口交通流的多态性,基于混合Gamma分布稠密性,准确拟合交叉口到... 详细信息

延误是评价交叉口服务水平的基本指标,延误模型对交叉口信号控制方案的选择意义重大.在多态交通条件下,采用现有模型分析信号控制下交叉口延误程度存在较大误差.为适应交叉口交通流的多态性,基于混合Gamma分布稠密性,准确拟合交叉口到达车头时距数据.运用拟合概率函数,统计交叉口进口到达交通量概率.将交叉口按照到达交通量大小分为欠饱和、过饱和两种状态,根据统计概率提出交叉口信号定时控制延误模型.实例分析表明,基于混合Gamma分布的延误与实际结果更为吻合.

关键词：延误混合Gamma分布多态交通流定时控制

Frequency domain wave equation forward modeling using gaussian elimination with static pivoting

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Applied Geophysics 2011年第1期8卷 60-68,95页

作者： Song Jian-Yong zheng xiao-Dong Zhang yan Xu Ji-Xiang Qin Zhen Song Xue-Juan Research Department of Geophysics Research Institute of Petroleum Exploration and Development Beijing 10083 China

Frequency domain wave equation forward modeling is a problem of solving large scale linear sparse systems which is often subject to the limits of computational efficiency and memory storage. Conventional Gaussian elimination cannot resolve the parallel computation of huge data. Therefore, we use the Gaussian elimination with static pivoting （GESP） method for sparse matrix decomposition and multi-source finite-difference modeling. The GESP method does not only improve the computational efficiency but also benefit the distributed parallel computation of matrix decomposition within a single frequency point. We test the proposed method using the classic Marmousi model. Both the single-frequency wave field and time domain seismic section show that the proposed method improves the simulation accuracy and computational efficiency and saves and makes full use of memory. This method can lay the basis for waveform inversion.

关键词： Gaussian elimination with static pivoting frequency-domain wave equation forward modeling single-frequency distributed parallel