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人工强化负载锰氧化物滤料去除地下水中氨/锰中试

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中国给水排水 2024年第3期40卷 15-22页

作者：窦韩黄廷林程亚西安建筑科技大学环境与市政工程学院陕西西安710055 陕西省环境工程重点实验室陕西西安710055 西北水资源与环境生态教育部重点实验室陕西西安710055

以人工强化负载锰氧化物滤料为研究对象,考察了在两种不同硬度、碱度地下水环境下活性滤料除氨/锰活性形成,以及滤料表面膜负载量与负载强度随时间的变化规律。结果表明,在低硬度、碱度水质环境下运行的1#滤柱除氨/锰活性形成速度显著... 详细信息

以人工强化负载锰氧化物滤料为研究对象,考察了在两种不同硬度、碱度地下水环境下活性滤料除氨/锰活性形成,以及滤料表面膜负载量与负载强度随时间的变化规律。结果表明,在低硬度、碱度水质环境下运行的1#滤柱除氨/锰活性形成速度显著高于高硬度、碱度环境下的2#滤柱,1#滤柱在第9天时出水氨浓度低于0.5 mg/L,2#滤柱在第21天时氨浓度低于0.5 mg/L。此外,人工强化负载滤料负载强度与表面膜负载量分别为0.07、0.92 g/10 g,均高于传统挂膜(0.02和0.072 g/10 g)。通过SEM与XRD发现,滤料形貌及结构在运行过程中发生了改变,成熟的滤料表面存在大量网状结构,并生成了水钠锰矿型锰氧化物。可见,人工强化负载锰氧化物滤料在低碱度、硬度地下水条件下更易形成除氨/锰活性,能够有效去除进水中2 mg/L的氨/锰,具有一定的工程应用价值。

关键词：催化氧化除氨/锰地下水

THE GRADIENT ESTIMATE OF SUBELLIPTIC HARMONIC MAPS WITH A POTENTIAL

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Acta Mathematica Scientia 2024年第4期44卷 1189-1199页

作者： han LUO School of Mathematical Sciences Fudan UniversityShanghai 200433China

In this paper,we investigate subelliptic harmonic maps with a potential from noncompact complete sub-Riemannian manifolds corresponding to totally geodesic Riemannian *** some suitable conditions,we give the gradient ... 详细信息

关键词： sub-Riemannian manifolds subelliptic harmonic maps with potential gradient estimate Liouville Theorem

Molecular dynamics study of hydrogen-induced cracking behavior of ferrite–pearlite gas transmission pipeline steel

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Journal of Iron and Steel Research International 2024年第2期31卷 488-500页

作者： Tao-long Xu Si-han Guo Gong-zhen He Hao-yu han Petroleum Engineering School Southwest Petroleum UniversityChengdu610500SichuanChina Sichuan East Gas Transmission Sales Center of Sinopec Natural Gas Branch Wuhan430074HubeiChina

Hydrogen embrittlement of pipelines depends on the hydrogen-induced cracking behavior of the pipeline steel *** on molecular dynamics analysis,the ferrite–cementite(α-Fe/Fe3C)lamellar atomic structure with the Bagaryatskii orientation relationship was established,and stepwise relaxation of the conjugate gradient energy minimization and constant-temperature and constant-pressure relaxation were performed under NPT(the isothermal–isobaric)*** mechanical property curves of theα-Fe/Fe3C models were obtained under different cementite terminal plane structures,and the evolution of the atomic structure was analyzed in *** addition,the influence of different hydrogen concentrations,different temperatures,different strain rates,changes in voids,and different micro-degrees of freedom on the deformation and failure mechanism of the model was investigated,aiming to provide a reliable way to explore the micro-mechanism of macro-cracking behavior of pipeline steel.

关键词： Ferrite-cementite lamellar structure Pipeline steel Failure mechanism Crack propagation Molecular dynamics

Optical Nonlinearity of Violet Phosphorus and Applications in Fiber Lasers

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Chinese Physics Letters 2024年第1期41卷 16-20页

作者：杨慧苒齐梦婷李旭鹏薛泽鲁晨浩成嘉伟韩冬冬李璐 School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China China Academy of Space Technology(Xi’an) Xi’an 710100China School of Electronic Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China

A D-shaped fiber is coated with a new two-dimensional nanomaterial,violet phosphorus(VP),to create a saturable absorber(SA)with a modulation depth of 3.68%.Subsequently,the SA is inserted into a fiber laser,enabling successful generation of dark solitons and bright–dark soliton pairs through adjustment of the polarization state within the *** further study,mode-locked pulses are achieved,proving the existence of polarization-locked vector *** results indicate that VP can be used as a polarization-independent SA.

关键词： polarization fiber absorber

A Generalized Blow up Criteria with One Component of Velocity for 3D Incompressible MHD System

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Chinese Annals of Mathematics,Series B 2024年第2期45卷 253-264页

作者： Bin han Xi XIONG Department of Mathematics Hangzhou Dianzi UniversityHangzhou 310018China

In this paper,the authors study the global regularity of the 3D magnetohydrodynamics system in terms of one velocity *** particular,they establish a new Prodi-Serrin type regularity criterion in the framework of weak ... 详细信息

关键词： MHD Regularity Blow-up criterion

Interface engineering of Fe-Sn-Co sulfide/oxyhydroxide heterostructural electrocatalyst for synergistic water splitting

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Nano Research Energy 2024年第2期3卷 31-38页

作者： Siyu Chen ting Zhang Jingyi han Hui Qi Shihui Jiao Changmin Hou Jingqi Guan Institute of Physical Chemistry College of ChemistryJilin UniversityChangchun 130021China The Second Hospital of Jilin University Changchun 130021China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

To realize large-scale hydrogen production by electrolysis of water,it is essential to develop non-precious metal catalysts for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).Here,we fabricate Sn-,Fe-,and Co-based sulfide/oxyhydroxide heterostructural catalyst on nickel foam(FeSnCo_(0.2)S_(x)O_(y)/NF)by solvothermal *** FeSnCo_(0.2)S_(x)O_(y)/NF requires low overpotentials of 48 and 186 mV at 10 mA·cm^(-2),respectively,for HER and *** it is assembled into an electrolytic cell as a bifunctional electrocatalyst,it only needs 1.54 V to reach 10 mA·cm^(-2),far better than IrO_(2)||Pt/C *** formation of sulfide/hydroxide heterostructural interfaces improves the electron transfer and reduces the reaction energy barrier,thus promoting the electrocatalytic processes.

关键词： oxygen evolution reaction hydrogen evolution reaction overall water splitting sulfide bifunctional electrocatalyst

我国典型化工行业VOCs排放特征及其对臭氧生成潜势

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环境科学 2024年第5期45卷 2613-2621页

作者：武婷崔焕文肖咸德翟增秀韩萌天津市生态环境科学研究院国家环境保护恶臭污染控制重点实验室天津300191 天津迪兰奥特环保科技开发有限公司天津300191

选取了我国5种典型化工行业VOCs排放源进行了源排放特征分析,通过对70个VOCs源样品的分析,结果表明,烷烃是合成材料制造业、石化行业和涂料产品制造业的主导VOCs种类(占比分别为43%、63%和68%),烯烃是日用化学产品制造业的VOCs主要种类(... 详细信息

选取了我国5种典型化工行业VOCs排放源进行了源排放特征分析,通过对70个VOCs源样品的分析,结果表明,烷烃是合成材料制造业、石化行业和涂料产品制造业的主导VOCs种类(占比分别为43%、63%和68%),烯烃是日用化学产品制造业的VOCs主要种类(46%),卤代烃在专用化学品制造业排放中占主导(43%);利用机器学习方法分析了上述行业的标志组分,发现癸烷和四氢呋喃是合成材料制造业源的特征标志组分,正丁醇和甲苯是日用化学产品制造业源的特征标志组分,1,2,3-三甲苯和1,3,5-三甲苯是石化行业源的特征标志组分,丙烯和3-甲基戊烷是涂料产品制造业的标志组分,对二甲苯和异丙苯是专用化学品制造业源的特征标志组分;并采用最大增量反应活性法(MIR)估算了各VOCs排放源的臭氧生成潜势(OFP),结果表明,在单位浓度总VOCs排放条件下,对臭氧生成潜势的贡献大小依次为日用化学产品制造业、专用化学品制造业、石化行业、合成材料制造业和涂料产品制造业.建议在今后的臭氧防控中,更应关注各行业所排放的关键活性物种,而不仅仅注重VOCs排放总量.

关键词：挥发性有机物(VOCs) 机器学习臭氧(O_(3)) 臭氧生成潜势(OFP) 化工行业

作业疗法联合rTMS对脊髓损伤伴胃肠功能失调的干预研究

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世界华人消化杂志 2024年第1期32卷 50-57页

作者：韩作献徐婷汪加胜浙江中医药大学附属金华中医院康复治疗部浙江省金华市321000

背景脊髓损伤伴胃肠功能紊乱的治疗方法对于神经功能的恢复并不十分理想.观察作业疗法联合重复经颅磁刺激有望相互弥补,发挥各自优势,提高患者的康复的质量.目的观察作业疗法联合重复经颅磁刺激(repetitive transcranial magnetic stimu... 详细信息

背景脊髓损伤伴胃肠功能紊乱的治疗方法对于神经功能的恢复并不十分理想.观察作业疗法联合重复经颅磁刺激有望相互弥补,发挥各自优势,提高患者的康复的质量.目的观察作业疗法联合重复经颅磁刺激(repetitive transcranial magnetic stimulation,rTMS)在脊髓损伤(spinal cord injury,SCI)伴胃肠功能失调患者中的应用效果.方法通过随机数字表法将2020-06/2023-03间符合选例标准的150例SCI伴胃肠功能失调患者分成3组,每组50例.对照1组采取作业疗法,对照2组采取rTMS治疗,观察组采取作业治疗联合rTMS治疗,治疗3个疗程.观察患者疗效、治疗前后神经电生理[胫神经体感诱发电位(SEP)、运动诱发电位(MEP)]、外周血细胞因子[白介素-1β(interleukin-1β,IL-1β)、白介素-6(interleukin-6,IL-6)、转化生长因子β1(transforming growth factor-β1,TGF-β1)]、下肢关键肌群肌力积分、肠道功能[神经源性肠道功能障碍(neurogenic bowel dysfunction,NBD)、Cleveland失禁评分系统、Wexner便秘评分、布里斯托尔(Bristol)大便分级]、肢体功能恢复指标[Barthel指数(Barthel Index,BI)、功能独立性测量(Functional Independence Measure,FIM)、Berg平衡量表(Berg Balance Scale,BBS)].结果观察组总有效率94.00%高于对照1、2组74.00%、80.00%(P对照2组>对照1组(P对照2组>对照1组(P对照1、2组(P<0.05).结论与单一康复疗法相比,rTMS联合作业疗法可降低免疫炎症反应,改善SCI伴胃肠功能失调患者受损的肢体运动及肠道功能,有助于其更好地回归家庭与社会.

关键词：脊髓损伤重复经颅磁刺激疗效功能恢复

Magnetic and electrical transport properties in GdAlSi and SmAlGe

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Chinese Physics B 2024年第7期33卷 554-560页

作者：巩静王欢马小平曾祥雨林浚发韩坤王乙婷夏天龙 Department of Physics Renmin University of ChinaBeijing 100872China Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Laboratory for Neutron Scattering Renmin University of ChinaBeijing 100872China

We conduct a detailed examination of the magnetic and electrical transport properties in GdAlSi and SmAlGe crystals,which possess a LaPtSi-type structure(space group I4_(1)md).The magnetic susceptibility data unambiguously reveal magnetic ordering below a characteristic transition temperature(T_(N)).For GdAlSi,a hysteresis loop is observed in the magnetization and magnetoresistance curves within the ab plane when the magnetic field is applied below T_(N),which is around32 *** specific heat anomalies are detected at 32 K for GdAlSi and 6 K for SmAlGe,confirming the occurrence of magnetic *** addition,the extracted magnetic entropy at high temperatures is consistent with the theoretical value of Rln(2J+1) for J=7/2 in Gd^(3+) and J=5/2 in Sm^(3+),*** also exhibits Schottky-like specific heat ***,both GdAlSi and SmAlGe exhibit positive magnetoresistance and a normal Hall effect.

关键词： crystal growth magnetism magnetotransport properties specific heat