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A BLG1 neural model implements the unique looming selectivity to diving target

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Optoelectronics Letters 2023年第2期19卷 112-116页

作者： LUAN Hao HUA Mu zhang yicheng YUE Shigang FU Qinbing School of Computer Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Computer Science University of LincolnLincoln LN67TSUK School of Automation Guangdong University of Petrochemical TechnologyMaoming 525000China School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006China

The bistratified lobula giant type 1(BLG1) neuron is an identified looming-sensitive neuron in crab's visual brain that demonstrates special sensitivity to diving targets, or descending approaching motions. In this paper, a novel neural model is proposed to shape such unique selectivity through incorporating a bio-plausible feedforward contrast inhibition synapse and a radially extending spatial enhancement distribution. Herein the synaptic connections and neuronal functions of this model are placed within a framework for matching and describing underlying biological findings. The systematic and comparative experiments have validated the proposed computational model that reconciles with the characteristics of BLG1 neurons in crab.

关键词： A BLG1 neural model diving target BLG

SBA-15分子筛负载对甲苯磺酸催化合成过氧化二异丙苯的性能和反应过程模拟

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高等学校化学学报 2024年第6期45卷 98-106页

作者：张小龙张毅城李庆朝查飞常玥唐小华西北师范大学化学化工学院兰州730070 山东阳谷华泰化工股份有限公司阳谷252300

采用浸渍法制备了SBA-15分子筛负载对甲苯磺酸(TsOH)催化剂TsOH/SBA-15,探究了其催化α-甲基苯乙烯(α-MS)和异丙苯过氧化氢(CHP)反应制备过氧化二异丙苯(DCP)的活性,并对反应过程进行了模拟分析.当进料比n(α-甲基苯乙烯)/n(异丙苯过... 详细信息

采用浸渍法制备了SBA-15分子筛负载对甲苯磺酸(TsOH)催化剂TsOH/SBA-15,探究了其催化α-甲基苯乙烯(α-MS)和异丙苯过氧化氢(CHP)反应制备过氧化二异丙苯(DCP)的活性,并对反应过程进行了模拟分析.当进料比n(α-甲基苯乙烯)/n(异丙苯过氧化氢)=2.0, TsOH/SBA-15用量为CHP质量的0.15%,于44℃反应2.5h, DCP的产率为62.1%.模拟计算结果表明,反应过程有异步协同反应和分步反应两种机理,在异步协同反应中α-MS, CHP和TsOH只需要经过一个过渡态即可完成,而分步反应中反应物需要经过两个过渡态以及一个中间体才能完成,两种路径均涉及2次H^(+)的转移.在44℃下,异步协同反应的反应能垒(ΔG)为121.8 kJ/mol,分步反应中两个过渡态对应的反应能垒分别为74.1和78.3 kJ/mol.

关键词：对甲苯磺酸 SBA-15分子筛过氧化二异丙苯异丙苯过氧化氢反应能垒

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西藏某铜钼矿选矿厂流程考查及优化

黄金 2024年第3期45卷 50-54页

作者：张逸铖紫金矿业集团股份有限公司

针对西藏某大型铜钼矿选矿流程进行了详细的流程考查,并借助工艺矿物学研究,查明了损失原因。在此基础上提出引入强力捕收剂、矿泥分散剂或进行矿泥开路试验、强化+0.100 mm和-0.010 mm 2个粒级产品的有效回收等措施,预计可提高金属铜... 详细信息

针对西藏某大型铜钼矿选矿流程进行了详细的流程考查,并借助工艺矿物学研究,查明了损失原因。在此基础上提出引入强力捕收剂、矿泥分散剂或进行矿泥开路试验、强化+0.100 mm和-0.010 mm 2个粒级产品的有效回收等措施,预计可提高金属铜回收率3~5百分点,为后续选矿工艺指标优化提供方向,奠定该铜钼矿山进一步“提质、控本、增效”的基础。

关键词：铜钼矿流程考查捕收剂矿泥分散剂开路浮选

A Direct Route to Tetrahydropyridazine Derivatives via DMAP-Catalyzed [4+2] Annulation of Allenoates with Arylazosulfones

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Chinese Journal of Chemistry 2023年第22期41卷 3031-3036,I0002页

作者： Xin Ji Ziyang Li Jinfeng zhang yicheng zhang Ling-Guo Meng Key Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationSchool of Chemistry and Materials ScienceHuaibei Normal UniversityHuaibeiAnhui 235000China

Herein,a DMAP-catalyzed[4+2]annulation ofα-substituted allenoates with arylazosulfones is reported,which affords facile access to tetrahydropyridazine derivative in synthetically useful yields.This reaction features mild conditions and good functional group tolerance.Moreover,the resultant products can be readily transformed into pyridazin-3-one derivatives in the presence of DDQ.

关键词： DMAP [4+2]Cycloaddition Tetrahydropyridazihe derivatives Pyridazin-3-one derivatives Allenes Zwitterions N-Heterocycles

Biomarker records of D5-6 columns in the eastern Antarctic Peninsula waters:responses of planktonic communities and bio-pump structures to sea ice global warming in the past centenary

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Advances in Polar Science 2021年第1期32卷 28-41页

作者： YANG Dan zhang Haisheng HAN Zhengbing HAN Xibin zhang yicheng CHEN Wensheng LIU Qian PAN Jianming FAN Gaojing LE Fengfeng LU Bing HUANG Jing Key Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Zhuhai Central Station of Marine Environmental Monitoring State Oceanic AdministrationZhuhai 519015China Polar Research Institute of China Shanghai 200136China*

Molecular biomarkers(e.g.,isoprenoid glycerol dialkyl glycerol tetraethers(iGDGTs)and proxies,such as di-unsaturated to tri-unsaturated highly branched isoprenoids(D/T)ratio,total organic carbon,δ^(13)C and ice-rafted debris(IRD))were used to reconstruct the dominant phytoplankton(diatoms,dinoflagellates and coccolithophores),phytoplankton and zooplankton productivity,biological pump structure,and archaea assemblage(Euryarchaeota and Crenarchaeota)from a marine sediment core(D5-6)dated with^(210)Pb(1922–2012).We characterized the environmental response to sea ice variations/global warming off the eastern Antarctic Peninsula.The results showed that(1)the biomarkers brassicasterol(average=519.79 ng·g^(-1)),dinosterol(average=129.68 ng·g^(-1))and C37 alkenones(average=40.53 ng·g^(-1))reconstructed phytoplankton(average=690.00 ng·g^(-1))and zooplankton(cholesterol average=669.25 ng·g^(-1))productivity.The relative contribution to productivity by different phytoplankton groups was diatoms>dinoflagellates>coccolithophores.This is consistent with field surveys showing that diatoms dominate the phytoplankton in waters adjacent to the Antarctic Peninsula.(2)The relative abundances of different highly branched isoprenoids reflected the contributions of sea ice algae and open water phytoplankton(D/T=1.2–30.15).Phytoplankton productivity and sea ice showed a good linear relationship with a negative correlation,indicating that more open water during periods of warming and reduced sea ice cover led to an enhanced biological pump.(3)Over the past 100 years,phytoplankton productivity and zooplankton biomass increased.This trend was particularly evident in the last 50 years,corresponding to increased global warming,and showed a negative correlation with IRD and D/T.This suggests that with decreasing sea ice coverage in a warming climate,diatom biomass greatly increased.Coccolithophore/diatom values and the ratio of C37 alkenones to total phytoplankton productivity decreased,indicating the proportion of coccolithophores in the phy

关键词： global warming phytoplankton productivity zooplankton productivity archaea iGDGTs sea ice proxy D/T eastern Antarctic Peninsula

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多设备源项区域监测反演算法初步研究

现代应用物理 2024年第1期15卷 54-58页

作者：于淼张毅诚杨海峰中国核电工程有限公司北京100840

在一些设备室和实验室中,可能存在同一区域布置多个带源项设备的情况。为了对同一区域内多个设备中的源项同时进行监测,提出了一种多设备源项的区域监测方法。该方法通过蒙特卡罗程序,确定各设备材料成分、几何尺寸及探测系统相关的响... 详细信息

在一些设备室和实验室中,可能存在同一区域布置多个带源项设备的情况。为了对同一区域内多个设备中的源项同时进行监测,提出了一种多设备源项的区域监测方法。该方法通过蒙特卡罗程序,确定各设备材料成分、几何尺寸及探测系统相关的响应矩阵,利用数值模拟或实验测量得到某工况下各探测器的探测响应计数,利用反演算法求解各设备的源项,实现对同一区域内多个源项的监测。数值模拟实验表明,该方法是可行的,能够实现对于区域内重点关注源项设备的监测,可缓解探测器中干扰的问题。

关键词：区域监测多设备源项反演算法蒙特卡罗程序

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满足个性需求的因材施教教学设计与实践

科教文汇 2024年第11期 57-60页

作者：章易程李蔚汪馗谢素超中南大学交通运输工程学院湖南长沙410075

为了充分培育个性特长,实现教书育人,结合学生的个性需求开展课程教学是“以学生为中心”的一项十分有意义的教学研究与实践。为了满足学生的个性需求,该文以“实验设计与分析”课程为例,分析了学生专业与研究方向的不同导致的个性需求... 详细信息

为了充分培育个性特长,实现教书育人,结合学生的个性需求开展课程教学是“以学生为中心”的一项十分有意义的教学研究与实践。为了满足学生的个性需求,该文以“实验设计与分析”课程为例,分析了学生专业与研究方向的不同导致的个性需求差异,并基于因材施教的教学原则,从案例分析、课堂互动、小组讨论、结课考核四方面进行教学设计。教学实践表明:满足个性需求的因材施教教学设计实现了教与学的高度融合,可以激发学生的学习兴趣,使学生获得更强的个性需求满足感和能力提高的成就感,是提高课堂教学质量的行之有效的教学途径。

关键词：个性需求因材施教教学设计

Distribution and Sources of Polycyclic Aromatic Hydrocarbons in the Sediment Cores M2 from the Prydz Bay and Implications for Sedimentary Environment

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Meteorological and Environmental Research 2019年第4期10卷 15-22页

作者： Yang Dan Han Xibin zhang Haisheng zhang yicheng Xu Xudan zhang Huijuan Key Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of Oceanography Ministry of Natural Resources Hangzhou 310012 China Key Laboratory of Submarine Geosciences Second Institute of Oceanography Ministry of Natural Resources Hangzhou 310012 China

In this study, the polycyclic aromatic hydrocarbons (PAHs) from the sediment cores M2 in the Pryza Bay of the Antarctica were quantitatively measured using GC-MS analysis, and it is found that the PAHs mainly included bicyclic naphthalene compounds, tricyclic phenanthrene and fluorine series (dibenzofuran and dibenzothiophene), and tetracyclic fluoranthene, pyrene and chrysene series. The results showed that the phenanthrene series with low molecular weight (tricyclic compounds) had a relatively higher content than the series with high molecular weight (tetracyclic compounds). The fluoranthene/(fluoranthene and pyrene) ratio of M2 varied from 0.46 to 0.54. Integrated with the content of 1,7-dimethylphenanthrene and terrigenous chrysene, it is inferred that PAHs in the sediments from the Pryzd Bay were originated from a mixed source of the products of petroleum, refined products and coal combustion, natural source and terrigenous higher plants. Complete methyl dibenzothiophene and dimethyldibenzothiophene series compounds were detected in the sediment cores, which are closely associated with a reducing environment. The ratio of dibenzothiophene to dibenzofuran was between 0.46 and 3.21, mostly greater than 0.7. Combined with the oxidation/reduction index (Pr/Ph) ranging from 0.45 to 0.61 for the sediment cores, it is indicated that these compounds were formed in a normal reducing environment. Geochemical parameters of PAHs such as TNR-1 (0.53-1.57), MPI (0.24-1.21), MDR (1.83-5.57), and MDBI (0.41-0.93), and maturity parameters such as C 29 /C 29 (+), C 31 22S/C 31 (22S+22R), C 32 22S/C 32 (22S+22R) and Ts/(Tm+Ts) were all indicative of high maturity. However, all the above parameters were significantly deviated from those of modern sediments and modern organisms, which undoubtedly shows the input of exogenous mature organic matter.

关键词： Antarctica Sediment core Polycyclic aromatic hydrocarbons Material source Sedimentary environment

恶劣基建环境中BIPV光伏组件安装工艺的研究

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设备监理 2024年第2期 55-57,65页

作者：于若甫张燚骋王二磊华能上海燃机发电有限责任公司上海200942 西安益通热工技术服务有限责任公司西安710032

面对泥泞地面和大型机械难以进入等复杂条件,恶劣的建设环境对BIPV(光伏建筑一体化)项目构成了巨大挑战。本文旨在探讨在这些特殊条件下的安装实施策略,研究了在恶劣地面条件下BIPV组件的安装过程,介绍了一种适用于泥泞和恶劣地面条件... 详细信息

面对泥泞地面和大型机械难以进入等复杂条件,恶劣的建设环境对BIPV(光伏建筑一体化)项目构成了巨大挑战。本文旨在探讨在这些特殊条件下的安装实施策略,研究了在恶劣地面条件下BIPV组件的安装过程,介绍了一种适用于泥泞和恶劣地面条件的光伏组件安装工具,总结了在恶劣建设环境下BIPV项目实施的项目实践,为在恶劣建设环境下进行BIPV项目建设提供参考和借鉴。

关键词：光伏建筑一体机光伏组件安装恶劣环境建设设备和工具