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Flame Morphology and Characteristic of Co-Firing Ammonia with Pulverized Coal on a Flat Flame Burner

Journal of Thermal Science 2024年第5期33卷 1935-1945页

作者： WANG Shengye CUI Mingshuang LIU Pengzhong DI Yi niu fang China Coal Research Institute Beijing 100013China Beijing Tiandi Rongchuang Technology Co.Ltd. Beijing 100013China National Energy Technology&Equipment Laboratory of Coal Utilization and Emission Control Beijing 100013China

Ammonia as a new green carbon free fuel co-combustion with coal can effectively reduce CO_(2)emission,but the research of flame morphology and characteristics of ammonia-coal co-combustion are not *** this work,we studied the co-combustion flame of NH_(3)and pulverized coal on flat flame burner under different oxygen mole fraction(X_(i,O_(2)))and NH_(3)co-firing energy ratios(E_(NH_(3))).We initially observed that the introduction of ammonia resulted in stratification within the ammonia-coal co-combustion flame,featuring a transparent flame at the root identified as the ammonia combustion *** to challenges in visually observing the ignition of coal particles in the ammonia-coal co-combustion flame,we utilized Matlab software to analyze flame images across varying E_(NH_(3))and X_(i,O_(2)).The analysis indicates that,compared to pure coal combustion,the addition of ammonia advances the ignition delay time by 4.21 ms to 5.94 *** E_(NH_(3))increases,the ignition delay time initially decreases and then ***,an increase in X_(i,O_(2))results in an earlier ignition delay *** burn-off time and the flame divergence angle of pulverized coal demonstrated linear decreases and increases,respectively,with the growing ammonia *** addition of ammonia facilitates the release of volatile matter from coal ***,in high-ammonia environments,oxygen consumption also impedes the surface reaction of coal ***,measurements of gas composition in the ammonia-coal flame flow field unveiled that the generated water-rich atmosphere intensified coal particle gasification,resulting in an elevated concentration of ***,nitrogen-containing substances and coke produced during coal particle gasification underwent reduction reactions with NO_(x),leading to reduced NO_(x)emissions.

关键词： co-firing ammonia with coal flame characteristic gas component ignition delay time burn-off time flame divergence angle flat flame burner flame morphology

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Sequence-Controlled Synthesis of Alternating Poly(ester amide)s using Water as Control Agent in One-Pot

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Chinese Journal of Polymer Science 2024年第8期42卷 1015-1020页

作者： Tao Liu fang-fang niu Kan Cheng Yu-Min Xia Bo-Mou Ma Xue-Li Wang Jian-Yong Yu Yong He State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Poly(ester amide)s(PEAs)attract much attention as a new kind of biodegradable ***,the synthesis of PEAs with sequence-regulated chain structures is still complicated due to the multistep polymerization,high monomer purity,as well as the usage of organic solvents,which greatly inhibits its development and ***,a one-pot strategy without solvent was developed to synthesize the alternating PEA fromα,ω-amino alcohol and dicarboxylic acid by sequential polycondensation,where water was used as the controlling agent for amidation and ***,the amidation and esterification were controlled to proceed in turn by adding or removing water,realizing the one-pot preparation of alternating *** resultant PEA is characterized by^1H-and^(13)C-NMR,and its chain structure is confirmed to be highly quasi-alternating similar to alternating PEAs prepared by classical methods The evaluations from DSC and DMA demonstrate that the properties of quasi-alternating PEA(T_(m)=102℃,ΔH_(m)=30J·g^(-1))are far superior to those of random PEA(T_(m)=72℃,ΔH_(m)<1 J·g^(-1)).

关键词： Biodegradable macromolecules Polymer architectures Sequence-controlled synthesis One-pot polymerization

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基于辐射传输模型探究机载高光谱激光雷达的植被垂直生化组分探测能力

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光谱学与光谱分析 2024年第7期44卷 2083-2092页

作者：郝一硕牛沂芳王力毕恺艺中国科学院空天信息创新研究院遥感与数字地球重点实验室(中国科学院)北京100101 中国科学院大学北京100049

自然环境下的植被群落,由于各种群之间以及种群与环境间的竞争与选择,常呈现出一定的垂直结构,对于同一植株的不同生长阶段,在垂直方向也有着不同的生理生化参数。对这种三维立体分布特征进行探测,能够进行生态环境立体化定量评价,对森... 详细信息

自然环境下的植被群落,由于各种群之间以及种群与环境间的竞争与选择,常呈现出一定的垂直结构,对于同一植株的不同生长阶段,在垂直方向也有着不同的生理生化参数。对这种三维立体分布特征进行探测,能够进行生态环境立体化定量评价,对森林碳储量估算和生物多样性保护等具有重要意义。传统的被动光学遥感以及激光雷达在植被生化参数垂直探测方面有较大的局限性,而高光谱激光雷达(Hyperspectral LiDAR,HSL)这一新型探测仪器的出现为探测植被生理生化参数垂直分布提供了新的手段。但由于受到硬件方面的限制,HSL在机载平台下对森林复杂立体场景的适用性尚未得到充分研究。故首先基于HSL原型样机在实验室开展小尺度的室内测量,以火炬花植株为目标,验证其对空间信息和光谱信息的一体化提取能力;随后进一步使用三维辐射传输模型构建具有垂直异质性特征的森林场景,模拟机载HSL设备实现森林的高光谱三维点云提取,结合植被指数和随机森林模型对场景中三种不同植被冠层的叶绿素浓度和类胡萝卜素浓度进行反演。结果表明:室内实验证实了HSL回波信息可以有效区分植株不同高度处光谱曲线的差异,火炬花上部红色叶片和下部绿色叶片的归一化植被指数分别小于和大于0.5;基于三维辐射传输模型成功构建了虚拟森林场景的机载HSL高光谱三维点云,在得到的24组植被指数中,有17组指数表现出良好的探测精度(平均绝对百分比误差MAPE<13%);植被叶绿素反演模型R^(2)达到0.93,上层、中层和下层的平均绝对误差MAE分别为6.26、3.40和2.81;类胡萝卜素反演模型R^(2)为0.91,上层、中层和下层的MAE分别为1.59、2.58和0.39。该研究显示出HSL设备是一种立体化提取植被光谱信息的有效手段,在探测森林等复杂植被场景的生化组分垂直分布方面具有巨大的应用潜力。

关键词：森林立体场景机载高光谱激光雷达三维辐射传输模型植被生化组分

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Surgical intervention combined with weight-bearing walking training promotes recovery in patients with chronic spinal cord injury:a randomized controlled study

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Neural Regeneration Research 2024年第12期19卷 2773-2784页

作者： Hui Zhu James D.Guest Sarah Dunlop Jia-Xin Xie Sujuan Gao Zhuojing Luo Joe E.Springer Wutian Wu Wise Young Wai Sang Poon Song Liu Hongkun Gao Tao Yu Dianchun Wang Libing Zhou Shengping Wu Lei Zhong fang niu Xiaomei Wang Yansheng Liu Kwok-Fai So Xiao-Ming Xu Kunming Tongren Hospital KunmingYunnan ProvinceChina Neurological Surgery and the Miami Project to Cure ParalysisMiller School of MedicineUniversity of MiamiMiamiFLUSA School of Biological Sciences The University of Western AustraliaPerthWAAustralia Minderoo Foundation PerthWAAustralia Clinical Center for Spinal Cord Injury Kunming General Hospital of Chengdu Military CommandKunmingYunnan ProvinceChina Department of Biostatistics and Health Data Science Indiana University School of MedicineIndianapolisINUSA Department of Orthopedic Spinal Surgery Xijing HospitalFourth Military Medical UniversityXi’anShaanxi ProvinceChina Spinal Cord and Brain Injury Research Center Department of Physical Medicine and RehabilitationUniversity of Kentucky College of MedicineLexingtonKYUSA Guangdong-HongKong-Macao Institute of CNS Regeneration Jinan UniversityGuangzhouGuangdong ProvinceChina W.M.Keck Center for Collaborative Neuroscience Rutgers UniversityPiscatawayNJUSA Neurosurgery Department Chinese University of Hong KongPrince of Wales HospitalHong Kong Special Administration RegionChina Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteDepartment of Neurological SurgeryIndiana University School of MedicineIndianapolisINUSA

For patients with chronic spinal cord injury,the co nventional treatment is rehabilitation and treatment of spinal cord injury complications such as urinary tract infection,pressure sores,osteoporosis,and deep vein *** is rarely perfo rmed on spinal co rd injury in the chronic phase,and few treatments have been proven effective in chronic spinal cord injury *** of effective therapies fo r chronic spinal co rd injury patients is *** conducted a randomized controlled clinical trial in patients with chronic complete thoracic spinal co rd injury to compare intensive rehabilitation(weight-bearing walking training)alone with surgical intervention plus intensive *** clinical trial was registered at ***(NCT02663310).The goal of surgical intervention was spinal cord detethering,restoration of cerebrospinal fluid flow,and elimination of residual spinal cord *** found that surgical intervention plus weight-bearing walking training was associated with a higher incidence of American Spinal Injury Association Impairment Scale improvement,reduced spasticity,and more rapid bowel and bladder functional recovery than weight-bearing walking training ***,the surgical procedures and intensive rehabilitation were *** Spinal Injury Association Impairment Scale improvement was more common in T7-T11 injuries than in T2-T6 *** combined with rehabilitation appears to have a role in treatment of chronic spinal cord injury patients.

关键词： chronic spinal cord injury intensive rehabilitation locomotor training neurological recovery surgical intervention weightbearing walking training

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煤矿职业卫生检测及职业病危害防治探讨

实验室检测

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实验室检测 2024年第6期2卷 120-123页

作者：牛便芳长治市盛鑫煤矿技术服务有限公司

目的分析煤矿职业卫生检测及职业病危害防治方法。方法阐述煤矿职业卫生检测的基本概念，探讨职业卫生检测主要方法和流程，并提出技术与管理方面的职业病防治策略。结果综合应用职业卫生检测手段和有效的防治措施，可降低煤矿职业... 详细信息

目的分析煤矿职业卫生检测及职业病危害防治方法。方法阐述煤矿职业卫生检测的基本概念，探讨职业卫生检测主要方法和流程，并提出技术与管理方面的职业病防治策略。结果综合应用职业卫生检测手段和有效的防治措施，可降低煤矿职业病发生率。结论煤矿职业卫生检测及职业病危害防治对于保障矿工健康和提高煤矿安全生产水平具有重要意义。

关键词：煤矿职业卫生检测职业病防治方法流程

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考虑投入和产出时滞效应的中国物流业绿色效率测度

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物流科技 2024年第3期47卷 22-26页

作者：翟丹妮牛芳南京邮电大学管理学院江苏南京210003

考虑到物流业投入和产出之间的时滞效应,以中国30个省(市、区)为研究对象,构建DEA模型处理非期望产出的聚合问题、投入和产出之间的时滞效应问题,有效测算出2014—2021年中国30个省(市、区)物流业绿色效率。结果表明:从整体角度看,八年... 详细信息

考虑到物流业投入和产出之间的时滞效应,以中国30个省(市、区)为研究对象,构建DEA模型处理非期望产出的聚合问题、投入和产出之间的时滞效应问题,有效测算出2014—2021年中国30个省(市、区)物流业绿色效率。结果表明:从整体角度看,八年间绿色效率呈先升后降的趋势,整体效率水平较低;从省域角度看,北京、上海和海南的绿色效率排名最好,河北、内蒙古、山东和新疆的绿色效率排名较低;从地区角度看,不同区域之间绿色效率水平差距较大,其中黄河中游地区、东北地区绿色效率排名居于后两位。最后根据研究结果提出改进物流业绿色效率现状的建议。

关键词：物流业绿色效率数据包络分析非期望产出时滞效应

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On the Mixed Pólya–Szegö Principle

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Acta Mathematica Sinica,English Series 2021年第5期37卷 753-767页

作者： niu Fa fang Jia Zu ZHOU Chern Institute of Mathematics Nankai UniversityTianjin 300071P.R.China School of Mathematics and Statistics Southwest UniversityChongqing 400715P.R.China College of Science Wuhan University of Science and TechnologyWuhan 430081P.R.China

In this paper,the mixed Pólya-Szegöprinciple is *** the mixed Pólya-Szegöprinciple,the mixed Morrey-Sobolev inequality and some new analytic inequalities are obtained.

关键词： Pólya–Szegöprinciple mixed Pólya–Szegöprinciple Sobolev inequality spherically symmetric rearrangement

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新就业形态视域下劳务端就业现状调查

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深圳职业技术大学学报 2024年第3期23卷 59-65页

作者：牛莹芳朱玉玺深圳职业技术大学管理学院广东深圳518055

新就业形态和灵活就业成为就业增收的重要渠道,国务院及地方政府相继出台相关政策,推动灵活用工行业的发展。基于认知理论,通过访谈、问卷分析等方式随机抽样调研深圳和东莞一线灵活用工劳务端的认知、就业意愿和就业现状。研究选取了... 详细信息

新就业形态和灵活就业成为就业增收的重要渠道,国务院及地方政府相继出台相关政策,推动灵活用工行业的发展。基于认知理论,通过访谈、问卷分析等方式随机抽样调研深圳和东莞一线灵活用工劳务端的认知、就业意愿和就业现状。研究选取了年龄作为解释变量,阐释年龄影响灵活就业的态度;根据有灵活就业经历参与者的反馈分析了他们的工作满意度、就业期待和影响因素;分析了就业者对于灵活就业工作形式的优点、挑战、信息和资源渠道的了解程度等。通过对劳务端就业现状的调查,提出劳务端输出企业和个人未来发展建议,为新就业形态的良性发展提供参考依据,也为人力资源管理部门充分了解劳务端的就业期待和就业权益保障提供参考,为企业输出劳务端、个人充分释放潜能提供实证依据。

关键词：新就业形态劳务端灵活就业就业认知就业意愿

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In Situ Loading of Cu_(2)O Nanoparticles on a Hydroxyl Group Rich TiO_(2) Precursor as an Excellent Catalyst for the Ullmann Reaction

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Nano Research 2010年第11期3卷 757-763页

作者： fang niu Yan Jiang Weiguo Song Beijing National Laboratory for Molecular Sciences(BNLMS) Laboratory for Molecular Nanostructures and Nanotechnology Institute of ChemistryChinese Academy of SciencesBeijing 100190China The Graduate University of the Chinese Academy of Sciences YuquanluBeijing100049China

An in situ method has been used to load Cu_(2)O nanoparticles on the surface of a hydroxyl group rich TiO_(2)***_(2)O nanoparticles are formed by in situ reduction of Cu(OH)_(2) with Sn^(2+)ions linked to the surface of the TiO_(2)*** initial Cu_(2)O nanoparticles serve as seeds for subsequent particle *** resulting Cu_(2)O nanoparticles are evenly dispersed on the surface of the TiO_(2)precursor,and are heat and air *** as-prepared composite is an excellent catalyst for Ullmann type cross coupling reactions of aryl halides with *** composite catalyst also showed good stability,remaining highly active after five consecutive runs.

关键词： Cuprous oxide in situ composite structure titania precursor Ullmann type cross coupling

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Catalytic activity of flame-synthesized Pd/TiO2 for the methane oxidation following hydrogen pretreatments

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Particuology 2018年第6期16卷 58-64页

作者： Nafeng Wang fang niu Shuhao Wang Yun Huang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy ofSdencesBeijing 100190China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China

A nanocatalyst composed of 10wt% Pd supported on TiO2 was synthesized using one-step flame spray pyrolysis with a highly-quenched premixed stagnation *** as-prepared nanoparticles,having a mean diameter of approximately 10nm,were then subjected to isothermal oxidation and reduction in a fixed bed *** potential roles of Pd and PdO as well as possible synergistic effects between these two active species were explored during methane *** lowest light-off temperature T20 was obtained at a Pd ratio of 53% and this result can be reasonably explained based on a surface Pd-PdO site pair ***,differences in the hysteresis behavior during methane oxidation were noted throughout a heating-cooling cycle over the temperature range of 200-600℃,such that the degree of hysteresis was strongly correlated with the Pd ratio.

关键词： Catalytic oxidation Palladium-based catalysts Flame-assisted spray pyrolysis Nanoparticles

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