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点云配准中初始变换的快速优化求解算法

西安电子科技大学学报 2017年第5期44卷 69-74页

作者：罗楠王泉西安电子科技大学计算机学院陕西西安710071

处理点云配准中初始对齐参数的求解问题旨在快速估计两帧数据间的刚体变换矩阵,给出精确的初始对齐.通过分析刚体变换的欧氏不变特征,提出一种距离差分矩阵算法,在尽量保留正确匹配的同时快速剔除点云数据的显著错误匹配.随后采用最小... 详细信息

处理点云配准中初始对齐参数的求解问题旨在快速估计两帧数据间的刚体变换矩阵,给出精确的初始对齐.通过分析刚体变换的欧氏不变特征,提出一种距离差分矩阵算法,在尽量保留正确匹配的同时快速剔除点云数据的显著错误匹配.随后采用最小二乘后向方法经少量迭代从剩余的匹配集中估计出准确的刚体变换参数.算法中的阈值参数根据点云分辨率自适应决定,消除了人为设定的不便和误差.针对多个数据集的测试表明,该算法可以快速有效地剔除误差匹配,求解出更优的初始变换,增强点云配准的精度和效率.

关键词：点云配准刚体变换距离差分矩阵特征匹配最小二乘后向方法点云分辨率

Evaluation of tungsten interatomic potentials for radiation damage simulations

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Tungsten 2020年第1期2卷 3-14页

作者： Li‑Xia Liu Xiao‑Chun Li Yang‑Chun Chen Wang‑Yu Hu Guang‑nan luo Fei Gao Hui‑Qiu Deng College of Materials Science and Engineering Hunan UniversityChangsha 410082China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China School of Physics and Electronics Hunan UniversityChangsha 410082China Department of Nuclear Engineering and Radiological Sciences University of MichiganAnn ArborMI 48109USA

The structure and properties of materials under neutron irradiation are an important basis in future fusion *** the absence of fusion neutron sources for irradiation experiments,it is increasingly important and urgent to carry out neutron irradiation simulations on fusion reactor materials and then establish complete databases of defect properties and collisional cascades,where the first and foremost step is to select suitable interatomic potentials for atomistic-level *** this work,six typic interatomic potentials for tungsten(W)are evaluated and reviewed systematically for radiation damage *** relative lattice stability and elastic constants of bulk W are considered first with those potentials;then,the properties of point defects and defect clusters at interstitial sites and vacancies are obtained by molecular statics/dynam-ics *** formation energies of interstitial/vacancy clusters,1/2anddislocation loops in W and the threshold displacement energies along different directions are also *** addition,the extended defects are further investigated,such as free surfaces and the energy profiles of 1/2{110}and 1/2{112}stacking *** current results provide a reference for selecting W potentials to simulate the radiation damage.

关键词： Interatomic potential Tungsten Radiation defect Molecular dynamics

MOF@γ-Al_(2)O_(3)复合材料的制备及其选择性染料吸附性能研究

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当代化工研究 2024年第3期 74-76页

作者：崔建鹏罗楠朱晓宇张潇飒李文泽刘禹沈阳化工大学辽宁110000

本文通过原位生长法将金属有机骨架(MOF)与γ-Al2O3相结合制备了两种MOF@γ-Al_(2)O_(3)复合材料,即UIO-66/UIO-66-NH2@γ-Al_(2)O_(3),并将其应用于选择性染料吸附性能研究。结果表明:UIO-66/UIO-66-NH_(2)@γ-Al2O3复合材料可选择性吸附阴离子染料(刚果红,CR),吸附量分别可以达到1520.91mg·g^(-1)和1598.65mg·g^(-1)。同时,UIO-66/UIO-66-NH2@γ-Al_(2)O_(3)复合材料还具备优异的稳定性,重复使用10次后对CR的选择性吸附性能基本保持不变。

关键词：金属有机骨架 γ-Al_(2)O_(3) 复合材料原位生长法染料吸附

HS-GC-MS法测定头孢氨苄原料药中基因毒性杂质特戊酰氯残留量

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广东化工 2024年第17期51卷 155-157页

作者：李小聪廖宗权谢瑶周妮曹晓洲罗楠孙志伟湖北三峡职业技术学院湖北宜昌443000 宜昌人福药业有限责任公司湖北宜昌443003

目的:建立并验证了顶空气相色谱-质谱(HS-GC-MS)法测定头孢氨苄原料药中的基因毒性杂质特戊酰氯的残留量。方法:采用HP-1MS UI毛细管柱(30 m×0.25 mm,0.5μm)色谱柱,载气为He,流速为1 ***^(-1);进样口温度200℃,定量环温度80℃,顶空平... 详细信息

目的:建立并验证了顶空气相色谱-质谱(HS-GC-MS)法测定头孢氨苄原料药中的基因毒性杂质特戊酰氯的残留量。方法:采用HP-1MS UI毛细管柱(30 m×0.25 mm,0.5μm)色谱柱,载气为He,流速为1 ***^(-1);进样口温度200℃,定量环温度80℃,顶空平衡温度70℃,传输线温度90℃,程序升温;质谱采用EI源,质谱传输线温度为250℃;定量测定采用选择离子(SIM)模式,特戊酸乙酯m/z 57.1。以4批头孢氨苄原料药为测定对象,测定其基因毒性杂质特戊酰氯的残留量。结果:特戊酸乙酯与相邻色谱峰之间的分离度良好,且在浓度范围50.170 ***^(-1)~501.695 ng·mL^(-1)内,其与峰面积线性关系良好(r=0.995),其定量限和检测限分别为24.945 ng·mL^(-1)和12.473 ng·m L^(-1),平均加样回收率为110%,RSD为6.0%(n=9)。结论:该法灵敏度高、专属性强,可用于测定头孢氨苄原料药中基因毒性杂质特戊酰氯的残留量。

关键词：顶空气相色谱-质谱头孢氨苄特戊酰氯基因毒性杂质

OsMPK4 promotes phosphorylation and degradation of IPA1 in response to salt stress to confer salt tolerance in rice

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Journal of Genetics and Genomics 2022年第8期49卷 766-775页

作者： Meiru Jia nan luo Xiangbing Meng Xiaoguang Song Yanhui Jing Liquan Kou Guifu Liu Xiahe Huang Yingchun Wang Jiayang Li Bing Wang Hong Yu State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China

Salt stress adversely affects plant growth,development,and crop ***(Oryza sativa L.)is one of the most salt-sensitive cereal crops,especially at the early seedling ***-activated protein kinase(MAPK/MPK)cascades have been shown to play critical roles in salt response in ***,the roles of the MPK cascade signaling in rice salt response and substrates of Os MPK remain largely ***,we report that the salt-induced Os MPK4-Ideal Plant Architecture 1(IPA1)signaling pathway regulates the salt tolerance in *** salt stress,Os MPK4 could interact with IPA1 and phosphorylate IPA1 at Thr180,leading to degradation of *** evidence shows that IPA1 is a negative regulator of salt tolerance in rice,whereas Os MPK4 promotes salt response in an IPA1-dependent *** together,our results uncover an Os MPK4-IPA1 signal cascade that modulates the salt stress response in rice and sheds new light on the breeding of salt-tolerant rice varieties.

关键词： Oryza sativa MPK OsMPK4 IPA1 Salt tolerance

Recent research progress on the compatibility of tritium breeders with structural materials and coatings in fusion reactors

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Tungsten 2022年第3期4卷 170-183页

作者： Chi Wang Bao-Long Ji Shou-Xi Gu Qiang Qi Lei Chen Hai-Shan Zhou Song-Lin Liu Guang-nan luo Hefei Institute of Physical Science Chinese Academy of SciencesHefei230031China University of Science and Technology of China Hefei230026China

Nuclear fusion energy is considered as a clean and safe energy *** the fuel of deuterium-tritium(D-T)fusion reactor,T must be produced by the reaction between neutron and lithium(Li)in the *** blanket of fusion reactor will work in a high-temperature and radioactive *** long-term contact between T breeders and structural materials in such a harsh environment will result in corrosion and microstructure modification of material surfaces,and then affect the mechanical properties and thermal conductivity of *** protect the structural materials from corrosion,coatings are applied to their *** addition,the coating also plays a role in preventing T *** compatibility of T breeder materials with structural materials and coatings in the breeding blanket has always been a *** this paper,the up-to-date data on liquid and solid blanket of fusion reactors,the interaction behavior of T breeders with candidate structural materials,including reduced activation ferritic/martensitic steel,oxide dispersion-strengthened steel,silicon carbide and vanadium alloy,and coatings are *** corrosion mechanism is also ***,the corrosion behavior between different types of materials is compared *** the end,the research and development prospects on this topic are suggested.

关键词： Nuclear fusion Tritium breeder Compatibility Blanket material

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中医药治疗幽门螺杆菌感染的现状与展望

中国中西医结合消化杂志 2024年第4期32卷 283-287页

作者：刘震田志华王少丽姜天童陈敬予罗楠李萌中国中医科学院广安门医院脾胃病科北京100053

幽门螺杆菌(Helicobacter pylori,HP)感染是一种感染性疾病,与多种消化系统疾病相关,我国的HP感染率高,随着抗生素的广泛使用,HP根除率下降。中医药是治疗HP感染的新路径之一,在相关的临床研究和基础研究方面都取得了一定的成功,本文综... 详细信息

幽门螺杆菌(Helicobacter pylori,HP)感染是一种感染性疾病,与多种消化系统疾病相关,我国的HP感染率高,随着抗生素的广泛使用,HP根除率下降。中医药是治疗HP感染的新路径之一,在相关的临床研究和基础研究方面都取得了一定的成功,本文综合论述中医药治疗HP感染的现状、优势、不足,并对未来的研究方向进行展望,旨在为从事该病研究的科研工作者提供参考和帮助。

关键词：中医药幽门螺杆菌感染现状展望

Potential therapeutic role of spermine via Rac1 in osteoporosis: Insights from zebrafish and mice

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CO_(2)和细水雾对地下变电站变压器火灾抑制作用研究

动物学研究 2024年第2期 367页

作者： Rui-Xue Jiang nan Hu Yu-Wei Deng Long-Wei Hu Hao Gu nan luo Jin Wen Xin-Quan Jiang

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四川电力技术 2024年第3期47卷 87-94页

作者：杨迎昕焦一飞曾文慧陈中国米红甫罗楠国网四川省电力公司经济技术研究院四川成都610041 重庆科技大学安全工程学院重庆401331

为了研究CO_(2)和细水雾对地下变电站变压器油火灾爆炸的抑制作用及其化学动力学机理,利用实验和Chemkin软件数值模拟研究了不同体积分数的细水雾和CO_(2)对化学当量比条件下20%H_(2)-CH_(4)-air混合物爆炸的影响。实验和模拟结果表明:... 详细信息

为了研究CO_(2)和细水雾对地下变电站变压器油火灾爆炸的抑制作用及其化学动力学机理,利用实验和Chemkin软件数值模拟研究了不同体积分数的细水雾和CO_(2)对化学当量比条件下20%H_(2)-CH_(4)-air混合物爆炸的影响。实验和模拟结果表明:细水雾对H_(2)-CH_(4)-air混合物的火焰结构和爆炸压力的抑制作用随着细水雾体积分数的增加而愈发明显;细水雾蒸发产生的水蒸气分子和CO_(2)在反应体系中主要起稳定的第三体作用,从而减缓了爆炸链式反应的发展。另外,CO_(2)是CH_(4)氧化反应的主要产物,加入CO_(2)会削弱甲烷氧化的基元反应;反应体系中加入细水雾会通过降低基元反应温度敏感性来抑制反应体系升温,并且加入CO_(2)会促进消耗·H自由基的基元反应发生。这也是CO_(2)和细水雾共同作用抑制效果优于细水雾单独作用的原因。以上研究结果可为地下变电站变压器油火灾爆炸防治技术的发展提供理论依据。

关键词：地下变电站 CO_(2) 细水雾 H_(2)-CH_(4)混合物抑制作用