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An engineering classification system for the detached granite blocks distributed on slopes

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Journal of Mountain Science 2023年第2期20卷 516-531页

作者： zhao Xiu-cheng zhao xiao-yan SHEN Wei-gang LUO Gang Department of Geology Engineering Faculty of Geosciences and Environmental EngineeringSouthwest Jiaotong UniversityChengdu 611756China

Gentle slopes with large amounts of granite blocks are widespread in granitic areas with warm and humid climate.These blocks pose a potential risk to the existing and planned infrastructure.The instability type and geometry of these blocks will influence their motility and destructive power to some extent.This study aims at creating a classification system that can indicate both the shape and the instability type of these blocks and then developing a block removal scheme.The classification system was constructed based on the mechanical stability analysis of blocks on an inclined surface.This analysis identified key factors affecting stability,including block shape,block weathering roundness,the existing state of a block on a slope,and the friction between the block and the slope.The achieved work allowed the establishment of a direct correlation between block geometry and their instability types.The availability of this classification system was validated by field data and experimental data in the literature.The proposal to remove blocks identified as the toppling types,such as cylindrical-toppling types,cuboid-toppling types,cube-toppling types,was put forward to avoid the uneconomical problem of a complete clearance.Meanwhile,this classification provides a foundation for further research on the instability probability of each type of block and the development of a more refined blocks’removal scheme.The classification approach adopted in this paper can provide a reference for the classification of other lithological blocks under similar engineering geological conditions.

关键词： South China Granite blocks Classification system Geometry characteristics Instability type Existing state

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甲基丙烯酸长碳链酯的合成及应用研究进展

应用化工 2024年第1期53卷 156-160,166页

作者：赵小艳房成吴超波南京林业大学化学工程学院江苏南京210037

概述了甲基丙烯酸长碳链酯的合成方法及反应机理,重点介绍了传统磺酸类、离子交换型树脂、固体酸、碱金属类、金属负载型、离子液体等催化剂合成甲基丙烯酸长碳链酯的研究进展,并梳理了每种催化剂在应用过程中的特点,综述了国内外关于... 详细信息

概述了甲基丙烯酸长碳链酯的合成方法及反应机理,重点介绍了传统磺酸类、离子交换型树脂、固体酸、碱金属类、金属负载型、离子液体等催化剂合成甲基丙烯酸长碳链酯的研究进展,并梳理了每种催化剂在应用过程中的特点,综述了国内外关于甲基丙烯酸长碳链酯在材料、纺织、涂料等应用领域的研究进展。由于甲基丙烯酸长碳链酯的酯化产量不高,应用领域也比较有限,未来应继续开发合成甲基丙烯酸长碳链酯的绿色、环保催化剂体系,扩大其在不同应用领域的研究。

关键词：甲基丙烯酸长碳链酯合成催化剂应用

Cloning and sequence analysis of US1 gene in duck enteritis virus

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中国预防兽医学报 2011年第2期33卷 105-109页

作者： zhao yan WANG Jun-wei MA Bo zhao xiao-yan Northeast Agricultural University Harbin 150030China State Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150001China

In this paper,a 1,860 bp sequence in IRs region of duck enteritis virus(DEV) was amplified by single oligonucleotide nested PCR with a single primer designed according to partial sequence of US1 and then a pair of primers designed according to the 3' UTR of US8 gene and 5' end of the new getting sequence were used to amplify a 2,426 bp sequence toward the TRs region.Sequence analysis revealed that the both sequences contained an identical 990 bp open reading frame of DEV US1 gene.The two ORFs were in opposite transcription orientation.Sequence comparison of the nucleotide sequence and the deduced amino acid sequence of US1 gene showed relatively high identity to Mardivirus.Phylogenetic tree analysis showed that the eleven herpesviruses viruses were classified into three groups,and the duck enteritis virus was most closely related to Mardivirus.

关键词：摘要编辑部编辑工作读者

德性觉醒视角下加强大学生品德教育的措施探索

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红河学院学报 2024年第2期22卷 49-52页

作者：赵小彦蚌埠医科大学马克思主义学院安徽蚌埠233030

大学生德性觉醒程度的高低关乎民族的未来和国家的命运。德性觉醒视角下,高校加强大学生品德教育是促进大学生认同社会伦理规范的应然选择,是引导大学生从容面对复杂环境的有效手段,是提升大学生德性自觉的必经之路。当前,面对部分大学... 详细信息

大学生德性觉醒程度的高低关乎民族的未来和国家的命运。德性觉醒视角下,高校加强大学生品德教育是促进大学生认同社会伦理规范的应然选择,是引导大学生从容面对复杂环境的有效手段,是提升大学生德性自觉的必经之路。当前,面对部分大学生德性认知出现较大偏差、德性情感日益淡漠、品德失范现象时有发生等问题,高校应果断采取加强德性意志对学生自我的约束、进一步拓展大学生德行体验、更加重视德性启发、建立并完善德性素养激励反馈机制等措施,强化大学生品德教育。

关键词：德性觉醒大学生高校

Directional arrangement of phyllite fragments in phyllite talus slopeat the eastern margin of the Tibetan Plateau

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Journal of Mountain Science 2021年第11期18卷 3069-3081页

作者： WAN Yu-hao zhao xiao-yan LING Si-xiang LI Jin ZENG Cai-yun BERND Wünnemann Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China

Phyllite fragments are essential for accumulating and generating talus slope at the toes of hillslopes,however,how they are linked to slope failure remains unknown.This paper reports the directional arrangement of phyllite fragments(DAPF)in phyllite talus slope at the eastern margin of the Tibetan Plateau.Field investigation,mathematical statistics and model experiments were performed in order to systematically understand the influencing factors,which include fragment shape,flat ratio,dip angle(α),and fine particle content(c).The results show that the quadrilateral fragmentgenerates a similar imbricate structure more easily than the triangular and rod fragments in the phyllite talus slope.Additionally,the flat phyllite fragments easily accumulate as imbricated structures on the phyllitetalus slope.When the dip angle(α)is in the range of 20°–30°,the minimum orientation ratio(P)is more than 50%,which means thatthe DAPF phenomenon is more obviousin the phyllite talus slope.For the fine particle content(c)at the same dip angle(α),the minimum orientation ratio(P)is 54%,and the minimum orientation ratio(P)correlates positively with the fine particle content(c).Therefore,compared with the homogeneous talusslope,the phyllite talusslopedisplays a special DAPF phenomenon.This study provides a valuable reference and presents novel knowledgefor risk assessment and engineering design against the phyllite talus slope failure mechanism.

关键词： Phyllitefragment Talus slope Directional arrangement Physical model experiment Field investigation

质心动态路径规划的变转速齿轮箱时频脊线索引算法

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振动工程学报 2024年第6期37卷 1077-1088页

作者：张伯麟万书亭赵晓艳张雄顾晓辉华北电力大学河北省电力机械装备健康维护与失效预防重点实验室河北保定071003 石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室河北石家庄050043

针对强噪声下难以估计信号瞬时频率的问题,提出了基于质心动态路径规划(DPPB)的变转速齿轮箱时频脊线索引算法。该算法在剖析多路径匹配追踪(MMP)脊线索引算法及其在强噪声下失效原因的基础上,通过对MMP算法得到的脊线集加窗求质心,构... 详细信息

针对强噪声下难以估计信号瞬时频率的问题,提出了基于质心动态路径规划(DPPB)的变转速齿轮箱时频脊线索引算法。该算法在剖析多路径匹配追踪(MMP)脊线索引算法及其在强噪声下失效原因的基础上,通过对MMP算法得到的脊线集加窗求质心,构建信号的脊线质心稀疏矩阵,并针对质心稀疏矩阵设计动态路径规划函数索引脊线上的质心点,根据脊线代价函数值计算最优时频脊线。将相似度系数Ra和置信度σRa作为脊线提取效果的衡量指标,通过仿真和试验验证了DPPB算法可有效提取强噪声信号的时频脊线,且不同程度噪声下的可靠性和鲁棒性均优于峰值索引算法和MMP脊线索引算法。

关键词：故障诊断齿轮箱质心动态路径规划(DPPB) 时频脊线索引多路径匹配追踪(MMP) 时频分析

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Pricing factors in capital market and investment strategy： Evidence from Chinese listed companies

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Journal of Modern Accounting and Auditing 2007年第11期3卷 19-25页

作者： zhao xiao-yan School of Economics and Management Tsinghua University Beijing 100084 China

奥曲肽联合奥美拉唑治疗消化性溃疡急性上消化道出血的临床效果及对凝血功能的影响

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医药论坛杂志 2024年第2期45卷 191-193,198页

作者：赵笑颜王小西白黎郑州大学第一附属医院感染性疾病科郑州450052

目的探讨消化性溃疡急性上消化道出血(acute upper gastrointestinal hemorrhage,AUGH)患者给予奥曲肽联合奥美拉唑治疗的临床效果及对凝血酶原时间(prothrombin time,PT)、活化部分凝血活酶时间(activated partial thromboplastin time,APTT)和凝血酶时间(thrombin time,TT)的影响。方法选择2021年10月至2022年10月郑州大学第一附属医院感染性疾病科收治的98例消化性溃疡AUGH患者为研究对象,按治疗用药不同,将常规干预基础上采用奥美拉唑治疗的49例作为对照组,将对照组基础上联合奥曲肽治疗的49例作为观察组,比较两组患者的凝血功能以及临床治疗有效率等。结果两组患者治疗前的凝血功能各项指标差异均无统计学意义(P>0.05);治疗后观察组TT、APTT和PT水平分别为(15.65±2.33)s、(36.57±4.61)s和(11.35±0.57)s,明显优于对照组(P0.05)。结论奥美拉唑联合奥曲肽对消化性溃疡AUGH疗效显著,能够对患者各项凝血功能指标进行改善,安全性高,值得临床推广。

关键词：奥曲肽奥美拉唑急性上消化道出血消化性溃疡凝血功能

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微量动态显色法细菌内毒素检查方法研究

中国药理学通报 2024年第7期40卷 1392-1398页

作者：张晨雪蔡彤陈晨赵小燕裴宇盛中国食品药品检定研究院化学药品检定所药理室北京102629 北京联馨药业有限公司北京102600

目的通过研究确定微量动态显色法能否满足《中国药典》的要求,作为现有细菌内毒素检查法的补充。方法使用微量动态显色法鲎试剂,每孔样品和鲎试剂加样量各为25μL,检测波长405 nm,预设OD值0.05,使用半孔酶标板检测。依据《中华人民共和... 详细信息

目的通过研究确定微量动态显色法能否满足《中国药典》的要求,作为现有细菌内毒素检查法的补充。方法使用微量动态显色法鲎试剂,每孔样品和鲎试剂加样量各为25μL,检测波长405 nm,预设OD值0.05,使用半孔酶标板检测。依据《中华人民共和国药典》2020年版第四部“9101药品质量分析方法验证指导原则”的规定,按照其项下“杂质测定”中“定量”项目的具体要求,进行专属性、准确度、精密度、定量限、线性、范围、耐用度7项内容的方法学验证,并对48个药品品种共74批样品开展了品种适用性研究,对76个药品品种共143批样品(包括133批阴性样品和10批阳性样品)进行日常检验,并将结果与传统显色法检验结果进行了比对分析。结果经过方法学验证,表明微量动态显色法符合《中华人民共和国药典》对定量方法的要求;经过品种适用性与一致性比对研究,结果表明微量动态显色法与传统显色法相比,具有较好的等效性。结论微量动态显色法可以作为现有细菌内毒素的补充方法推广使用。

关键词：细菌内毒素方法学验证品种适用性一致性比对微量动态显色法补充替代方法