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木质素碳量子点在防伪包装中的应用研究

包装工程 2024年第3期45卷 45-54页

作者：马子航张培培孔得贤秦秀钊徐长妍南京林业大学材料科学与工程学院南京210037

目的探索木质素碳量子点(CQDs)荧光油墨及其书写式标签、CQDs/聚乙烯醇(PVA)复合荧光薄膜在防伪包装中的应用潜力。方法以木质素为碳源,采用一锅水热法得到未掺杂碳量子点O-CQDs和硫掺杂碳量子点S-CQDs,并以此为荧光填料,以乙醇、乙... 详细信息

目的探索木质素碳量子点(CQDs)荧光油墨及其书写式标签、CQDs/聚乙烯醇(PVA)复合荧光薄膜在防伪包装中的应用潜力。方法以木质素为碳源,采用一锅水热法得到未掺杂碳量子点O-CQDs和硫掺杂碳量子点S-CQDs,并以此为荧光填料,以乙醇、乙二醇和丙三醇的混合液为溶剂,制备荧光油墨及其书写式荧光标签和CQDs/PVA复合荧光薄膜,探索其荧光防伪性能。结果硫掺杂木质素碳量子点油墨MS-CQDs及其书写标签、PVA复合薄膜在可见光下均无色,在365nm紫外光照下则呈现强烈的淡蓝色荧光。结论 MS-CQDs书写式称量纸荧光标签及其与PVA的复合薄膜均具有良好的荧光性能,在荧光防伪领域具有良好的应用潜力。

关键词：木质素碳量子点碳量子点荧光油墨碳量子点/聚乙烯醇荧光薄膜防伪性能

Influences of the Three Gorges Dam in China on Precipitation over Surrounding Regions

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Journal of Meteorological Research 2017年第4期31卷 767-773页

作者： Yan LI Weican ZHOU Xianyan che. dexian FANG Qianqian ZHANG Key Laboratory of Meteorological Disaster of Ministry of Education Joint International Research Laboratory of Climate and Environment Changeand Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science&TechnologyNanjing 210044 National Climate Center Beijing 100081 Chongqing Institute of Meteorological Sciences Chongqing 401147

Impacts of the Three Gorges Dam（TGD） in China on the regional pattern and annual amount of precipitation around the Three Gorges Reservoir（TGR） are examined by comparing observations before and after the operation of TGD（1984–2003 and 2004–13）. Empirical orthogonal function（EOF） analysis of the annual precipitation anomalies clearly indicates that the land-use change associated with the construction of TGD has not significantly changed the precipitation pattern. To investigate the impacts of TGD on the rainfall amount, we compare the relative variations of atmospheric variables related to precipitation formation in three spatial bands： over TGR, near TGR, and far from TGR. It is found that the differences in annual rainfall over TGD between the two periods before and after the operation of TGD are small, suggesting a weak impact of TGD on the rainfall amount. The TGD water level increased from 66 m before June 2003 to 175 m after 2010, and this may have slightly reduced precipitation on the local scale.

关键词： Three Gorges Dam precipitation empirical orthogonal function (EOF) analysis

试论构建中职班主任能力评价体系的必要性和可行性

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成才之路 2024年第19期 73-76页

作者：刘丽恒吴波罗德宪祝世杰四川省食品药品学校四川峨眉山614201

随着职业教育的快速发展,中职班主任的素质和能力要求日益提高。因此,通过建立一套科学、合理的班主任能力评价体系,中职学校可以更准确地了解班主任的工作表现,及时发现和解决问题,促进班主任的不断成长和进步。文章基于中职班主任能... 详细信息

随着职业教育的快速发展,中职班主任的素质和能力要求日益提高。因此,通过建立一套科学、合理的班主任能力评价体系,中职学校可以更准确地了解班主任的工作表现,及时发现和解决问题,促进班主任的不断成长和进步。文章基于中职班主任能力评价体系的现状,分析构建中职班主任能力评价体系的必要性,探讨构建中职班主任能力评价体系的可行性,旨在提升中职班主任队伍的整体素质和专业水平,优化班级管理效果,推动职业教育的持续发展。

关键词：中职班主任能力评价体系必要性可行性工作能力

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父母教养方式与儿童情绪管理能力的关系:同伴交往能力的中介作用

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教育文化论坛 2024年第4期16卷 76-86页

作者：李德显李文灿黄丽娇辽宁师范大学教育学部辽宁大连116029 华东师范大学教育学系上海200062

随着家庭教育相关理论的日臻完善,父母教养方式与儿童情绪管理的关系研究逐渐增多,提高儿童的社会交往能力成为研究热点。本研究以500名3—6岁儿童为研究对象,以莫里斯幼儿适应三重模型为参照,采用父母教养方式量表、幼儿同伴交往量表... 详细信息

随着家庭教育相关理论的日臻完善,父母教养方式与儿童情绪管理的关系研究逐渐增多,提高儿童的社会交往能力成为研究热点。本研究以500名3—6岁儿童为研究对象,以莫里斯幼儿适应三重模型为参照,采用父母教养方式量表、幼儿同伴交往量表和儿童情绪管理量表为研究工具,通过结构方程模型考察父母教养方式与儿童情绪管理能力之间的关系以及儿童的同伴交往能力在其间的中介作用。研究发现:父母教养方式、儿童同伴交往能力均与儿童情绪管理能力显著相关,三者具有交互预测作用;中介效应模型表明儿童同伴交往能力在父母教养方式对儿童情绪管理能力的影响中存在中介作用,民主性教养可以通过影响儿童同伴交往能力,间接推动其情绪管理能力的积极生长;专制性教养、溺爱性教养和放任性教养可以间接抑制儿童同伴交往能力,阻碍其情绪管理能力的提高。为提升和稳定儿童管理自身情绪的能力,父母应加强对不同教养方式的认知以及重视对儿童同伴交往能力的培养,并将这一教育理念体现在家庭教育实践之中,促进儿童身心健康发展。

关键词：父母教养方式同伴交往儿童情绪管理中介作用莫里斯幼儿适应三重模型

Recombinant sTRAIL induces cell death of tumor cell lines as well as primary cancer cells

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Chinese Science Bulletin 1999年第14期44卷 1306-1309页

作者： Yanxin Liu Xun Zhu Zhengyu Ma dexian Zheng Peking Union Med Coll Chinese Acad Med Sci Inst Basic Med Sci Natl Lab Med Mol Biol Beijing 100005 Peoples R China Peking Union Med Coll Chinese Acad Med Sci Inst Hematol Natl Lab Expt Hematol Tianjin 300020 Peoples R China

Tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) is a new member of TNF family. It was reported that TRAIL could induce apoptosis of tumor cells but not normal cells in tissue culture system. To further study the biological activity and potential clinical significance, a recombinant soluble TRAIL (rsTRAIL) has been expressed stably in E. coli after transformation of pET28b vector containing the extracellular domain of TRAIL. The yield of rsTRAIL is approximately as high as 60% of whole bacterial proteins. The rsTRAIL, purified by Ni^+ -agarose affinity chromatography, could remarkably trigger apoptosis at the concentrations of 0.1—1 μg/mL in all 7 tumor cell lines tested in vitro. However, this killing activity has not been observed in mouse fibroblast cell line (NIH3T3) as normal control. Further investigation shows that the rsTRAIL could also kill primary tumor cells isolated freshly from patients with cardiac cancer, breast cancer and malignant thymoma, while the normal human

关键词： rsTRAIL apoptosis primary cancer cells.

v-Fos transformation effector binds with CD2 cytoplasmic tail

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Chinese Science Bulletin 2006年第1期51卷 38-47页

作者： LI Ming ZHANG Weilun LIU Shilian LIU Yanxin ZHENG dexian National Laboratory of Medical Molecular Biology Institute of Basic Medical Sciences Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100005 China

We previously reported that v-Fos transformation effector (Fte-1) is a novel CD2 binding protein identified by yeast two hybrid system. In the present study, we further characterize the molecular properties and biological activity of the Fte-1. In vitro interaction analysis by an IAsys Resonant Mirror Bio- sensor further demonstrated that Fte-1 interacts with CD2 specifically, and the dissociation constant (Kd) of Fte-1-CD2 is 10?7 mol. The molecular section analysis showed that protein kinase C (PKC) phos- phorylation site at Ser238 of Fte-1, as confirmed by in vitro phosphorylation, is essential for the specific in- teraction with CD2. Jurkat T cells transfected with expression vector encoding for EGFP-Fte-1 fusion protein showed that Fte-1 displays a clustering dis- tribution in the cells. Upon stimulation by CD2 mono- clonal antibody T11, Fte-1 lost the character of clus- tering distribution and translocation to the plasma membrane, which were disrupted by mutation of Fte-1 (Ser238Gly), suggesting that Fte-1 could be co-localized with CD2 on the membrane, and Fte-1 phosphorylation at Ser238 is a crucial factor in CD2-mediated interaction with Fte-1. Suppression of Fte-1 expression by small interference RNA (siRNA) diminished the susceptibility of Jurkat T cells to apoptosis triggered by phorbol 12-myristate 13-ace- tate (PMA) and ionomycin, indicating that the bio- logical function of Fte-1 may be involved in the regu- lation of activation and apoptosis of T cells. These results provide further evidence that Fte-1 is a novel binding protein of CD2, and may function as a down- stream molecule in the CD2-mediated events.

关键词：磷酸化 Fte-1 CD2 结合蛋白 PKC

Applications of deep learning in mineral discrimination: a case study of quartz， biotite and K-feldspar from granite

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Journal of Earth Science 2023年

作者： Wei Lou dexian Zhang School of Geosciences & Info-physics， Central South University Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitor (Central South University)， Ministry of Education

Mineral identification and discrimination play a significant role in geological study. Intelligent mineral discrimination based on deep learning has the advantages of automation， low cost， less time consuming and low error rate. In this manuscript， characteristics of quartz， biotite and K-feldspar from granite thin sections under cross-polarized light were studied for mineral images intelligent classification by Inception-v3 deep learning convolutional neural network (CNN)， and transfer learning method. Dynamic images from multi-angles were employed to enhance the accuracy and reproducibility in the process of mineral discrimination. Test results show that the average discrimination accuracies of quartz， biotite and K-feldspar are 100.00%， 96.88% and 90.63%. Results of this study prove the feasibility and reliability of the application of convolution neural network in mineral images classification. This study could have a significant impact in explorations of complicated mineral intelligent discrimination using deep learning methods and it will provide a new perspective for the development of more professional and practical mineral intelligent discrimination tools.

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小麦初生根和次生根水肥利用效率及其与产量的关系

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麦类作物学报 2024年第9期44卷 1161-1171页

作者：马文奇周苏玫梁文宪胡乃月谢松鑫贾晓雯贺德先杨习文河南农业大学农学院/国家小麦工程技术研究中心/省部共建小麦玉米作物学国家重点实验室/河南粮食作物协同创新中心河南郑州450046

为探究小麦初生根和次生根水肥利用能力的差异,于2021-2023年在河南省以主栽小麦品种周麦30和周麦32为材料,采用盆栽和分根移位的方法,设置初生根和次生根均灌水施肥(CK)、初生根不灌水(SRW_(0))、初生根不施肥(SRF_(0))、初生根不灌水... 详细信息

为探究小麦初生根和次生根水肥利用能力的差异,于2021-2023年在河南省以主栽小麦品种周麦30和周麦32为材料,采用盆栽和分根移位的方法,设置初生根和次生根均灌水施肥(CK)、初生根不灌水(SRW_(0))、初生根不施肥(SRF_(0))、初生根不灌水不施肥(SRW_(0)F_(0))、次生根不灌水(NRW_(0))、次生根不施肥(NRF_(0))和次生根不灌水不施肥(NRW_(0)F_(0))7个处理,分别于越冬期、返青期、拔节期、开花期、灌浆期和成熟期分析初生根和次生根根系干物质量、根系活力、根系中氮磷钾素积累量的差异,并分析其对产量及其构成因素、籽粒中氮磷钾素积累量、氮磷钾素利用率和灌水利用率的影响。结果表明,分根水肥条件下,各处理的小麦单株初生根干物质量在越冬期均高于次生根,于开花期达到最大值;次生根干物质量在返青期以后均大于初生根,于灌浆期达到最大值。所有处理的各生育时期次生根根系活力始终高于初生根,初生根和次生根根系活力分别在返青期和拔节期达到最高值。分根水肥条件下,成熟期籽粒中磷素积累量及氮素和钾素利用率均表现为初生根水肥供应不足处理低于次生根水肥供应不足处理,即SRW_(0)

关键词：小麦初生根次生根根系活力养分利用率灌水利用率

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镍渣—全尾砂混合骨料配比试验研究

黄金科学技术 2024年第3期32卷 437-444页

作者：张涛李德贤张鹏强赵国亮何宇牛猛俞军真镍钴共伴生资源开发综合利用全国重点实验室甘肃金昌737100 金川镍钴研究设计院甘肃金昌737100 金川集团股份有限公司甘肃金昌737100

为实现固废循环利用,降低尾砂和镍渣的固废堆存,开展了镍渣—全尾砂混合骨料配比试验。通过扫描电镜和X射线荧光光谱测定(XRF)方法分析了镍渣和全尾砂的粒级分布和化学成分,利用骨料堆积密实度理论确定了镍渣—尾砂的配比优化范围为4∶6... 详细信息

为实现固废循环利用,降低尾砂和镍渣的固废堆存,开展了镍渣—全尾砂混合骨料配比试验。通过扫描电镜和X射线荧光光谱测定(XRF)方法分析了镍渣和全尾砂的粒级分布和化学成分,利用骨料堆积密实度理论确定了镍渣—尾砂的配比优化范围为4∶6、5∶5和6∶4;考虑料浆的流动性、和易性及充填体强度,最终推荐镍渣—全尾砂的最优配合比为5∶5,料浆的质量浓度为77%~79%,水泥添加量为310 kg/m^(3);针对镍渣—全尾砂充填,镍渣利用量最高不超过50%,最大质量浓度为79%,对应的剪切应力为112.634 Pa,黏度为0.938 Pa·s。

关键词：镍渣全尾砂配比固废资源化充填骨料金川铜镍矿