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New insights in nano-copper chromite catalyzing ultrafine AP:Evaluation of dispersity and mixing uniformity

Defence Technology（防务技术） 2024年第2期32卷 120-133页

作者： yong kou Peng Luo Lei Xiao Yanping Xin Guangpu Zhang Yubing Hu Junqing Yang Hongxu Gao Fengqi Zhao Wei Jiang Gazi Hao National Special Superfine Powder Engineering Research Center of China School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing210094China Xi'an North Huian Chemical Industry Co.Ltd Xi'an710302China Xi'an Modern Chemistry Research Institute Xi'an710065China

Improving the application of nanomaterials has always been a research hotspot in the field of energetic materials(EMs)due to their obvious catalytic effect on the EMs,especially the uniformly dispersed ***,few studies have reported the dispersion of *** this study,the dispersity and mixing uniformity of nano-CuCr_(2)O_(4)was evaluated based on the difference of solid UV light absorption between the nano-catalytic materials and *** nano-CuCr_(2)O_(4)/ultrafine AP composites with different dispersity of nano-CuCr_(2)O_(4)were prepared by manual grinding and mechanical grinding with different grinding strength and griding *** then,the absorbance of different samples at 212 nm was obtained by solid UV testing due to the high repeatability of the absorbance at 210-214 nm for three parallel experiments,and the dispersity of different samples was calculated through the established difference ***,the samples were characterized by XRD,IR,SEM,EDS,DSC and TG-MS,which confirmed that different mixing methods did not change the structure of the samples(XRD and IR),and the mixing uniformity improved with the increase of grinding strength and grinding time(SEM and EDS).The scientificity and feasibility of the difference equation were further verified by *** dispersity of nano-CuCr_(2)O_(4)exhibits a positive intrinsic relationship with its catalytic performance,and the uniformly dispersed nano-CuCr_(2)O_(4)significantly reduces the thermal decomposition temperature of ultrafine AP from 367.7 to 338.8℃.The TG-MS patterns show that the dispersed nano-CuCr_(2)O_(4)advanced the thermal decomposition process of ultrafine AP by about 700 s,especially in the high temperature decomposition stage,and the more concentrated energy release characteristic is beneficial to further enhance the energy performance of AP-based *** above conclusions show that the evaluation method of dispersity based on solid UV curves could pro

关键词： Nano-CuCr_(2)O_(4) Ultrafine AP Dispersity UVeVis diffuse reflectance spectroscopy Thermal decomposition

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热门城市旅游产业发展对经济增长的影响效应研究——以GDP过万亿城市为例

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兰州交通大学学报 2024年第3期43卷 148-156页

作者：张林孙永权寇勇西安市发展和改革委员会经济研究所西安710007 陕西省林业局西安710000

GDP过万亿城市作为旅游热门城市,具有衡量旅游业发展水平与经济增长效率的突出代表性,对推动产业融合发展,构建现代产业体系价值显著。本文选取我国GDP过万亿城市作为样本城市,通过构建综合全面的研究指标体系,运用聚类分析法、线性回... 详细信息

GDP过万亿城市作为旅游热门城市,具有衡量旅游业发展水平与经济增长效率的突出代表性,对推动产业融合发展,构建现代产业体系价值显著。本文选取我国GDP过万亿城市作为样本城市,通过构建综合全面的研究指标体系,运用聚类分析法、线性回归模型、稳健性检验等研究方法,测算分析2012-2021年间样本城市旅游产业对经济增长的耦合协调度,并进行线性回归分析。研究结果显示样本城市旅游产业均对经济发展呈现正向促进作用,但城市间存在的现实差距导致旅游业对经济发展的影响作用显著不同,其中,吸附型旅游城市旅游产业与经济发展耦合水平处于高度融合阶段,持平型旅游城市处于良好互动阶段,输出型旅游城市仍有待优化提升,建议样本城市应当结合自身实际,探索旅游产业与经济增长融合可持续发展模式,推动实现城市高质量发展。

关键词：旅游产业经济增长影响效应互动融合协同发展

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Iron/aluminum nanocomposites prepared by one-step reduction method and their effects on thermal decomposition of AP and AN

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Defence Technology（防务技术） 2023年第4期22卷 74-87页

作者： yong kou Yi Wang Jun Zhang Kai-ge Guo Xiao-lan Song School of Environment and Safety Engineering North University of ChinaTaiyuanShanxi030051China School of Materials Science and Engineering North University of ChinaTaiyuanShanxi030051China School of Ordance Engineering Naval University of EngineeringWuhanHubei430033China School of Chemical Engineering Nanjing University of Science and TechnologyNanjingJiangsu210094China

Aluminum(Al)powder is widely used in solid *** particular,nano-Al has attracted extensive scholarly attention in the field of energetic materials due to its higher reactivity than ***,the existence of aluminum oxide film on its surface reduces the heat release performance of the aluminum powder,which greatly limits its ***,this paper used iron,a component of solid propellant,to coat micron-Al and nano-Al to improve the heat release efficiency and reactivity of Al ***,TEM,EDS,XRD,XPS,and BET were used to investigate the morphological structure and properties of pure Al and Fe/Al composite fuels of different *** results show that Fe was uniformly coated on the surface of Al *** was no reaction between Fe and Al,and Fe/Al composite fuels had a larger specific surface area than pure Al,which could better improve the reactivity of pure ***,the catalytic effects of pure Al and Fe/Al composite fuels of different sizes on ammonium perchlorate and ammonium nitrate were *** results show that the catalysis of pure Al powder could be greatly improved by coating Fe on the surface of Al ***,the micron-Fe/Al composite fuel had a higher catalytic effect than the pure nano-Al ***,Fe/Al composite fuels are expected to be widely used in solid propellants.

关键词： Aluminum Fe/Al composite fuel High reactivity Thermal decomposition AP AN

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Building a More Sustainable Chinese Loess Plateau

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Journal of Earth Science 2024年第1期35卷 283-287页

作者： Peiyue Li Xiaomei kou yong Wang Le Niu School of Water and Environment Chang'an UniversityXi'an 710054China Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education Chang'an UniversityXi'an 710054China Key Laboratory of Eco-Hydrology and Water Security in Arid and Semi-Arid Regions of the Ministry of Water Resources Chang'an UniversityXi'an 710054China PowerChina Northwest Engineering Corporation Limited Xi'an 710065China PowerChina Sinohydro Bureau 3 Co. LTD.Xi'an 710024China

The Chinese Loess Plateau,a region of remarkable ecological and economic value,grapples with significant water management challenges due to its distinctive geology and *** perspective offers a short review of the eco-environmental protection measures undertaken in the Loess Plateau,underscoring the transformative impacts of initiatives such as the“Grain for Green”***,it also highlights the enduring challenges,including land degradation,water resources issues,socio-economic inequities,and the implications of climate ***,water management emerges as a pivotal issue with far-reaching repercussions for soil conservation,biodiversity,and human *** paper concludes by proposing future actions,emphasizing the necessity for policy modifications,novel initiatives,and research to tackle these challenges and foster sustainable development in the Loess *** insights gained from this region could offer invaluable lessons for other regions confronted with similar challenges,thereby contributing to global efforts to mitigate desertification and champion sustainable development.

关键词： Loess Plateau eco-environmental protection water management sustainable development climate change

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A practical iterative two-view metric reconstruction with uncalibrated cameras

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第10期8卷 1614-1623页

作者： ZHOU yong-jun kou Xin-jian School of Naval Architecture. Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

This paper presents a practical iterative algorithm for two-view metric reconstruction without any prior knowledge about the scene and motion in a nonsingular geometry configuration. The principal point is assumed to locate at the image center with zero skew and the same aspect ratio, and the interior parameters are fixed, so the self-calibration becomes focal-length cali- bration. Existing focal length calibration methods are direct solutions of a quadric composed of fundamental matrix, which are sensitive to noise. A quaternion-based linear iterative Least-Square Method is proposed in this paper, and one-dimensional searching for optimal focal length in a constrained region instead of solving optimization problems with inequality constraints is applied to simplify the computation complexity, then unique rotational matrix and translate vector are recovered. Experiments with simulation data and real images are given to verify the algorithm.

关键词：照相测量法计算机视觉广义相对论性定向度量重建

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青藏高原东部高山森林的地上固碳速率:未来森林管理方案的影响

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Journal of Plant Ecology 2023年第3期16卷 177-190页

作者： Yang Lin Jiang-Tao Xiao yong-Ping kou Jia-Xing Zu Xin-Ran Yu Yuan-Yuan Li Ministry of Education Key Laboratory of Land Resources Evaluation and Monitoring in Southwest China Sichuan Normal UniversityChengdu 610066China School of Geography and Resource Science Sichuan Normal UniversityChengdu 610101China CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China Ministry of Education Key Laboratory of Environment Change and Resources Use in Beibu Gulf Nanning Normal UniversityNanning 530001China

青藏高原东部的高山森林是长江上游的重要生态屏障。然而,由于近几十年来持续的高强度采伐,大量的人工种植,以及完全的禁伐等措施,导致树木种类与年龄结构变得相对单一,生物多样性和生态功能都有所下降。为设计有效的森林管理方案,以优... 详细信息

青藏高原东部的高山森林是长江上游的重要生态屏障。然而,由于近几十年来持续的高强度采伐,大量的人工种植,以及完全的禁伐等措施,导致树木种类与年龄结构变得相对单一,生物多样性和生态功能都有所下降。为设计有效的森林管理方案,以优化森林结构,提高森林碳汇能力,本研究以四川茂县为研究地点,利用LANDIS-II模型对6种不同强度的森林管理方案(采伐、种植)进行测试,模拟和比较了这些方案与当前管理方案在未来100年间森林地上固碳速率的差异。研究结果表明:(i)与目前的管理方案相比,不同强度的采伐和种植明显改变了森林地上固碳速率;(ii)不同群落对管理方案的反应不同,不同的管理方案对寒温带针叶林和温带针叶林的地上固碳速率有显著的影响(P<0.05),但对阔叶林影响较小;(iii)应综合物种、群落和景观3个层面全面考虑森林管理方案。这些结果说明,在研究地点实施较长的采伐和种植间隔(20年)可以最大限度地提高森林的地上固碳速率。该研究为评估森林管理方案在恢复森林生态和增加碳汇功能的能力,以及为在青藏高原东部地区选择有效的森林管理方案提供了重要参考。

关键词：地上固碳速率物种与群落森林管理生态过程森林景观模型高山森林青藏高原

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New insights in nano-copper chromite catalyzing ultrafi ne AP: Evaluation of dispersity and mixing uniformity

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Defence technology 2024年第2期

作者： yong kou Peng Luo Lei Xiao Yanping Xin Guangpu Zhang Yubing Hu Junqing Yang Hongxu Gao Fengqi Zhao Wei Jiang Gazi Hao

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Prognostic implications of ferroptosis-associated gene signature in colon adenocarcinoma

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World Journal of Clinical Cases 2021年第29期9卷 8671-8693页

作者： Yan-Dong Miao Zhi-yong kou Jiang-Tao Wang Deng-Hai Mi The First Clinical Medical College Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Oncology The First Affiliated Hospital of Kunming Medical UniversityKunming 650000Yunnan ProvinceChina Dean’s Office Gansu Academy of Traditional Chinese MedicineLanzhou 730000Gansu ProvinceChina

BACKGROUND Colon adenocarcinoma(COAD)is one of the most common and fatal malignant tumors,which increases the difficulty of prognostic ***,new biomarkers for the diagnosis and prognosis of COAD should be *** is a recently identified programmed cell death process that has the characteristics of iron-dependent lipid peroxide ***,the predictive value of ferroptosis-related genes(FRGs)for COAD still needs to be further *** To identify some critical FRGs and construct a COAD patient prognostic signature for clinical *** The Cancer Genome Atlas database(TCGA)and Gene Expression Omnibus databases were the data sources for mRNA expression and corresponding COAD patient clinical *** expressed FRGs were recognized using R and Perl *** constructed a multi-FRG signature of the TCGA-COAD cohort by performing a univariate Cox regression and least absolute shrinkage and selection operator Cox regression *** patients from the Gene Expression Omnibus cohort were utilized for *** Our research showed that most of the FRGs(85%)were differentially expressed between the corresponding adjacent normal tissues and cancer tissues in the TCGA-COAD *** FRGs were related to overall survival(OS)in the univariate Cox analysis(all P1,P<0.01).The predictive capacity of the model was verified by a receiver operating characteristic curve *** addition,a nomogram based on the expression of five hub FRGs and risk score can precisely predict the OS of individual COAD cancer p

关键词： Colon adenocarcinoma Ferroptosis Immune status Prognosis Overall survival

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Biomimetic Phosphohydrolase Nanozyme Based on DefectEngineered Metal-Organic Framework

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CCS Chemistry 2024年第7期6卷 1821-1835页

作者： Xiaoxue kou Yuhong Lin yong Shen Linjing Tong Rui Gao Suya Liu Siming Huang Fang Zhu Guosheng Chen Gangfeng Ouyang MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of ChemistrySun Yat-sen UniversityGuangzhou 510006 Shanghai NanoPort Thermo Fisher ScientificPudong DistrictShanghai 200120 Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target and Clinical Pharmacology The NMPA and State Key Laboratory of Respiratory DiseaseSchool of Pharmaceutical Sciences and The Fifth Affiliated HospitalGuangzhou Medical UniversityGuangzhou 511436

Phosphodiester bonds are the backbone linkages of all the nucleic acids which store and transfer biological *** hydrolysis of phosphodiester bonds is of great importance to the replication,recombination,and damage repair of DNA as well as the maturation and processing of ***,the spontaneous scission of individual phosphodiester linkages is kinetically challenging under physiological conditions,with an estimated half-life of 30 million ***,we discover a defect-engineered Zr-metal-organic framework(Zr-MOF)nanozyme containing cluster-missing reo defects,named UiO-66 REO,that possesses intrinsic phosphodiesterase-like activity that allows for the cleavage of the phosphodiester bond in physiological condition(pH=7.4 and 37℃),outperforming the activityrecording *** atomic-level structure of the UiO-66 REO nanozyme has been directly identified by the synchrotron radiation absorption spectrum and integrated differential phase contrast-scanning transmission electron *** find that both the defective boundary regions and unusual Zr6-clusters formed in the reo phase of the UiO-66 REO nanozyme contribute to the improvement in efficiency of phosphodiesterase-like hydrolysis,which realizes the cleavage of DNA in mild *** work offers a new insight into biomimetic enzymology using crystal and defect engineering and opens up new possibilities for the development of low-cost,structurally stable and sustainable phosphodiesterase nanozymes for different biological applications.

关键词： nanozyme metal-organic framework biomimetic catalysis hydrolase-like activity defective engineering

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搅拌时间对粗骨料膏体均质性及早期强度的影响

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中国有色金属学报 2022年第4期32卷 1164-1174页

作者：闫泽鹏尹升华严荣富邹龙寇永渊寇鹏飞北京科技大学土木与资源工程学院北京100083 北京科技大学金属矿山高效开采与安全教育部重点实验室北京100083 金川集团股份有限公司镍钴资源综合利用国家重点实验室金昌737100

搅拌时间是保证膏体拌合物均匀的最快捷且经济的方法。本文以金川矿区粗骨料及全尾砂为主要研究对象,采用全面实验的方法研究了膏体质量浓度和搅拌时间对膏体表面状态、流动性及硬化早期强度的影响,并结合SEM扫描对不同搅拌时间条件下... 详细信息

搅拌时间是保证膏体拌合物均匀的最快捷且经济的方法。本文以金川矿区粗骨料及全尾砂为主要研究对象,采用全面实验的方法研究了膏体质量浓度和搅拌时间对膏体表面状态、流动性及硬化早期强度的影响,并结合SEM扫描对不同搅拌时间条件下膏体硬化强度的发生机制进行探讨。结果表明:对应于搅拌轴不同位置的膏体振动扩散度并未呈现明显的规律性,工业搅拌机搅拌轴不同位置对膏体均质性的影响不大。随着搅拌时间增加,膏体振动扩散度越来越大,流动性逐渐得到改善。质量浓度较大时会影响膏体物料混合的均质性,对于试验中质量浓度为78%的充填物料,经过6 min的搅拌尚不足以得到密实均匀的高质量浆体。搅拌作用可以促进膏体内部结构的形成,充分的搅拌时间可以提高水泥在膏体中的分散性,C-S-H凝胶产量增大,提高膏体的硬化早期强度,结合膏体制备工艺,建议搅拌时间控制在4~5 min。

关键词：搅拌时间膏体均质性流动性早期强度粗骨料

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