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Electron engineering of nickel phosphide for Ni^(δ+) in electrochemical nitrate reduction to ammonia

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Nano Research 2024年第6期17卷 4864-4871页

作者： Jie Hu Hao Huang Miao Yu Shuang Wang Jinping li College of Environmental Science and Engineering Taiyuan University of TechnologyJinzhong 030600China School of Sustainable Energy Materials and Science Jinhua Advanced Research InstituteJinhua 321000China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan University of TechnologyTaiyuan 030024China

The electrochemical reduction of nitrate to ammonia(ENRA)provides an efficient approach to remove nitrate pollution and achieve ammonia production ***,inspired by bio-enzyme in denitrifying bacteria,a carbon-coated nickel phosphide(NiPC)nanosheet derived from metal-organic frameworks(MOFs)is proposed as an efficient catalyst for *** electron engineering,controllable Ni^(δ+)in nickel phosphide is achieved by regulating the degree of phosphating,which enhances its activity for the hydrogenation of *** the result,Niδ+becomes one of dominating factors determining the efficiency of the ENRA reaction in nickel *** optimal NiPC catalyst exhibits impressive property toward ENRA:NH_(4)^(+)Faraday efficiency of 96.68%,NH4+selectivity of 99.04%,and nitrate conversion rate of 90.43%under low nitrate concentration(200 mg·L^(−1)).This work opens a new avenue for the design of next-generation catalysts through electron engineering for ENRA.

关键词： electron engineering transition metal phosphide nitrate reduction ammonia production metal-organic frameworks

lightweight Si_(3)N_(4)@SiO_(2) ceramic foam for thermal insulation and electromagnetic wave transparency

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Nano Research 2024年第5期17卷 4298-4306页

作者： Zongwei Tong Xiangjie Yan Yuexiang Wang Kexun li Weihai Ma China-Blarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect the 33rd Research Institute of ChinaElectronics Technology Group CorporationTaiyuan 030032China Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education School of Material Science and EngineeringTianjin UniversityTianjin 300072China Department of Materials Science and Engineering Jinzhong UniversityJinzhong 030619China

Increasing porosity is one of the most direct ways to improve the thermal insulation and dielectric properties of *** now,many wet methods for preparing Si_(3)N_(4) ceramic foams usually face the problems of complex rheology,long period,and expensive cost,and the reported pore sizes of Si_(3)N_(4) ceramic foams are typically micron-grade,resulting in a lack of competitiveness in thermal insulation and wave-transparent *** this paper,the Si_(3)N_(4)@SiO_(2) ceramic foams were prepared using an efficient dry-method,which combined three processes of low temperature chemical vapor deposition(LTCVD),template,and isostatic *** method has the advantages of simple operation and short preparation period,and can realize near-net size molding and mass *** addition,the evolution mechanisms of honeycomb microstructure and composition of Si_(3)N_(4)@SiO_(2) ceramic foam during sintering were studied by chemical reaction *** as-prepared Si_(3)N_(4)@SiO_(2) ceramic foam possesses low density(0.377 g·cm^(-3)),high compressive strength(7.5 MPa),low thermal conductivity(0.0808 W·m^(-1)·K^(-1)),and excellent dielectric properties(εlied in the interlayer of Si_(3)N_(4) ceramic radome to improve its thermal insulation and electromagnetic wave transparency performances.

关键词： silicon nitride ceramic foam honeycomb microstructure dielectric properties thermal insulation

From atomistic modeling to materials design:computation-driven material development in lithium-ion batteries

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Science China Chemistry 2024年第1期67卷 276-290页

作者： Xiangrong li Xiang Chen Qiang Bai Yifei Mo Yizhou Zhu Research Center for Industries of the Future and School of Engineering Westlake UniversityHangzhou 310030China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Materials Science and Engineering University of MarylandCollege Park 20742United States

As an advanced energy storage system,lithium-ion batteries play an essential role in modern *** their ubiquitous success,there is a great demand for continuous improvements of the battery performance,including higher energy density,lower safety risk,longer cycling life,and lower *** performance improvement requires the design and development of novel electrode and electrolyte materials that exhibit desirable properties and satisfy strict *** modeling can provide a unique perspective to fundamentally understand and rationally design battery *** this paper,we review a few recent successful examples of computation-driven discovery and design in electrode and electrolyte ***,we highlight how atomistic modeling can reveal the underlying mechanisms,predict the important properties,and guide the design and engineering of electrode and electrolyte *** have a conclusion with a discussion of the unique capability of atomistic modeling in battery material development and provide a perspective on future challenges and directions for computation-driven battery material developments.

关键词： materials design computation modeling batteries electrolyte electrode

On traceable iterated line graph and hamiltonian path index

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Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 239-252页

作者： NIU Zhao-hong XIONG li-ming YANG Wei-hua School of Mathematical Sciences Shanxi UniversityTaiyuan 030006China School of Mathematics and Statistics Beijing Key Laboratory on MCAACIBeijing Institute of TechnologyBeijing 100081China Department of Mathematics Taiyuan University of TechnologyTaiyuan 030024China

Xiong and liu[21]gave a characterization of the graphs G for which the n-iterated line graph L^(n)(G)is hamiltonian,for n≥*** this paper,we study the existence of a hamiltonian path in L^(n)(G),and give a characterization of G for which L^(n)(G)has a hamiltonian *** applications,we use this characterization to give several upper bounds on the hamiltonian path index of a graph.

关键词： iterated line graph traceable hamiltonian index hamiltonian path index

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大肠杆菌计数方法的比较与相关性分析

延边大学农学学报 2019年第3期41卷 71-75页

作者：李亭玉孔洁王元崔明勋李艳茹李太元延边大学农学院

为了对大肠杆菌的不同计数方法进行比较研究,并探究OD600值、浊度与大肠杆菌活菌数之间的关系。试验采用大肠杆菌作为试验菌株,将细菌配制成菌悬液,用分光光度计、浊度计测量其OD600值及浊度,并采用平板计数法、显微计数法检测细菌数量... 详细信息

为了对大肠杆菌的不同计数方法进行比较研究,并探究OD600值、浊度与大肠杆菌活菌数之间的关系。试验采用大肠杆菌作为试验菌株,将细菌配制成菌悬液,用分光光度计、浊度计测量其OD600值及浊度,并采用平板计数法、显微计数法检测细菌数量,进行比较分析。结果表明:大肠杆菌2种计数方法的计数结果为显微计数法>平板计数法,且2种计数方法之间存在各自的特点;同时,大肠杆菌菌液OD600值和浊度与活菌数呈线性关系,其回归方程分别为y=27.067 x-4.025和y=0.156 x-0.169,均呈良好的相关性,可根据回归方程,测量OD600值或浊度直接推算出细菌的活菌数,其方法简单方便,为大肠杆菌计数问题提供理论依据。

关键词：大肠杆菌计数方法 OD600值浊度相关性分析

达芬奇机器人手术系统和腹腔镜胃癌根治术后淋巴结检出数目的影响因素分析(附1396例报告)

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中华消化外科杂志 2021年第5期20卷 512-518页

作者：高庚妹江群广唐博熊凌强何鹏辉叶善平刘东宁雷雄李太原南昌大学第一附属医院普通外科 330006

目的探讨影响达芬奇机器人手术系统和腹腔镜胃癌根治术后淋巴结检出数目的相关因素。方法采用回顾性病例对照研究方法。收集2014年12月至2019年7月南昌大学第一附属医院收治的1396例行达芬奇机器人手术系统或腹腔镜胃癌根治术病人的临... 详细信息

目的探讨影响达芬奇机器人手术系统和腹腔镜胃癌根治术后淋巴结检出数目的相关因素。方法采用回顾性病例对照研究方法。收集2014年12月至2019年7月南昌大学第一附属医院收治的1396例行达芬奇机器人手术系统或腹腔镜胃癌根治术病人的临床病理资料;男991例,女405例;年龄为(60±11)岁。根据病人意愿选择达芬奇机器人手术系统或腹腔镜手术。早期胃癌行D1+淋巴结清扫术,进展期胃癌行标准D2淋巴结清扫术。观察指标:(1)术中情况。(2)术后情况。(3)影响胃癌根治术后淋巴结检出数目的相关因素分析。(4)随访和生存情况。采用门诊或电话方式进行随访,了解病人术后生存情况。随访时间截至2020年10月。正态分布的计量资料以x±s表示。单因素分析采用χ²检验或Fisher确切概率法,多因素分析采用Logistic回归模型。采用Kaplan-Meier法计算生存率。结果(1)术中情况:1396例病人均完成胃癌根治术,行达芬奇机器人手术系统胃癌根治术415例,行腹腔镜胃癌根治术981例,其中35例(达芬奇机器人手术系统胃癌根治术5例、腹腔镜胃癌根治术30例)中转开腹手术。1396例病人中,行远端胃切除术983例,行全胃切除术400例,行近端胃切除术13例;行BillrothⅠ式吻合597例,行BillrothⅡ式吻合385例,行Roux-en-Y吻合401例,行食管-残胃吻合13例。415例行达芬奇机器人手术系统胃癌根治术病人手术时间、术中出血量和术中输血例数分别为(221±51)min、(201±81)mL和24例;981例行腹腔镜胃癌根治术病人上述指标分别为(196±42)min、(232±76)mL和75例。(2)术后情况:1396例病人术后首次肛门排气时间、术后首次进食流质食物时间、术后住院时间分别为(3.0±1.0)d、(4.2±1.5)d、(9.0±3.8)d。1396例病人中,210例发生术后并发症(Ⅰ~Ⅱ级并发症170例、Ⅲ~Ⅴ及并发症40例),其中8例因术后严重并发症死亡,其余202例经对症支持治疗后痊愈。1396例病人术后组织病理学检查结果示腺癌958例,黏液腺癌220例,印戒细胞癌218例;淋巴结检出数目为(26.0±8.3)枚,阳性淋巴结数目为(3.6±0.9)枚;淋巴结检出数目≥16枚1312例,淋巴结检出数目<16枚84例。(3)影响胃癌根治术后淋巴结检出数目的相关因素分析:单因素分析结果显示主刀医师、手术方式、胃切除范围、神经侵犯、肿瘤浸润深度、肿瘤病理学N分期是影响达芬奇机器人手术系统和腹腔镜胃癌根治术后淋巴结检出数目的相关因素(χ²=13.167,6.029,15.686,5.573,9.402,17.139,P<0.05)。多因素分析结果显示:主刀医师、手术方式、胃切除范围、肿瘤病理学N分期是影响达芬奇机器人手术系统与腹腔镜胃癌根治术后淋巴结检出数目的独立因素(优势比=1.589,2.018,1.787,0.267,95%可信区间:1.221~2.068,1.140~3.570,1.066~2.994,0.103~0.689,P<0.05)。(4)随访和生存情况:1396例病人中,1256例获得随访,随访时间为2~70个月,中位随访时间为27个月;1256例病人3年累积生存率为70.2%。结论主刀医师、手术方式、胃切除范围、肿瘤病理学N分期是影响达芬奇机器人手术系统和腹腔镜胃癌根治术后淋巴结检出数目的独立因素。

关键词：胃肿瘤胃切除术根治术淋巴结检出数目达芬奇机器人手术系统腹腔镜检查

Novel process for facile preparation of mesoporous silica-based materials with controllable pore structure from coal fly ash Author links open overlay panel

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Particuology 2024年第8期91卷 128-137页

作者： Jian-ming Gao Zhen li Shujia Ma Yuanyuan Zhang Fangqin Cheng Institute of Resources and Environment Engineering State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste ResourcesShanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related WastesShanxi UniversityTaiyuan 030006China

Extraction of silica from fly ash to produce mesoporous silica materials is one of the most important utilization *** silica could not be synthesized on a large-scale by conventional sol-gel *** this paper,facile preparation of mesoporous silica with controllable pore structure from fly ash by the template-free process via two steps of mineral phase transformation and selective acid etching was *** influence of crystalline structure and acid etching degree on structure of as-synthesized mesoporous silica materials was revealed,as well as mechanism of crystalline structure transformation and pore structure *** results show that mullite and quartz could be transformed into acid-soluble kaliophilite when fly ash reacted with K_(2)CO_(3)at temperature of 800-1100℃.The hexagonal kaliophilite would be transformed into orthorhombic KAlSiO_(4)-O1 phase when the temperature is controlled at 1100℃.Mesoporous silica with specific surface area of 475.93 m^(2)/g and 642.57 m^(2)/g could be synthesized from activated fly ash with kaliophilite and KAlSiO_(4)-O1 phase crystalline *** controlling the degree of acid etching,mesoporous silica materials with different pore structures can be *** paper provides a cost-effective and large-scale process for the preparation of mesoporous silica materials with controllable pore structure from solid waste fly ash.

关键词： Fly ash Mesoporous silica Crystal transformation Acid etching Controllable pore structure

Calcium carbonate promotes the formation and stability of soil macroaggregates in mining areas of China

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Journal of Integrative Agriculture 2024年第3期23卷 1034-1047页

作者： Junyu Xie Jianyong Gao Hanbing Cao Jiahui li Xiang Wang Jie Zhang Huisheng Meng Jianping Hong Tingliang li Minggang Xu College of Resources and Environment Shanxi Agricultural UniversityTaigu 030801China Shanxi Province Key Laboratory of Soil Environment and Nutrient Resources Taiyuan 030031China College of Land Science and Technology China Agricultural UniversityBeijing 100193China

We studied changes in the concentrations of aggregate-cementing agents after different reclamation times and with different fertilization regimes,as well as the formation mechanism of aggregates in reclaimed soil,to provide a theoretical basis for rapid reclamation of soil fertility in the subsidence area of coal mines in Shanxi Province,*** this study,soil samples of 0–20 cm depth were collected from four fertilization treatments of a longterm experiment started in 2008:no fertilizer (CK),inorganic fertilizer (NPK),chicken manure compost (M),and50%inorganic fertilizer plus 50%chicken manure compost (MNPK).The concentrations of cementing agents and changes in soil aggregate size distribution and stability were *** results showed that the formation of>2 mm aggregates,the aggregate mean weight diameter (MWD),and the proportion of>0.25 mm water-stable aggregates (WR_(0.25)) increased significantly after 6 and 11 years of *** concentration of organic cementing agents tended to increase with reclamation time,whereas free iron oxide (Fed) and free aluminium oxide(Ald) concentrations initially increased but then *** general,the MNPK treatment signi?cantly increased the concentrations of organic cementing agents and CaCO_(3),and CaCO_(3) increased by 60.4%at 11 years after ***,CaCO_(3) had the greatest effect on the stability of aggregates,promoting the formation of>0.25 mm aggregates and accounting for 54.4%of the variance in the proportion and stability of the *** was concluded that long-term reclamation is bene?cial for improving soil *** MNPK treatment was the most effective measure for increasing maize grain yield and concentration of organic cementing agents and CaCO_(3).

关键词： reclamation time manure combined with inorganic fertilizer soil aggregate stability cementing agents CaCO_(3)

Thermally modulated photoelectronic synaptic behavior in HfS_(2)/VO_(2) heterostructure

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Rare Metals 2024年第8期43卷 3798-3809页

作者： Le Wang lin Wang Xiao-Yun Ye Xiong-Hu Xu li-Yan Shang Ya-Wei li Jin-Zhong Zhang liang-Qing Zhu Zhi-Gao Hu Technical Center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)Department of PhysicsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Neuromorphic computing is known for its efficient computational speed,low latency,and reduced power consumption,which is considered a pivotal technology to overcome the von Neumann *** synapses are an indispensable component of neuromorphic computational artificial neural *** guarantee effective and precise processing of optical signals,it must have a high responsivity,detectivity,and the ability to adapt to various ***,a synaptic transistor based on the HfS_(2)/VO_(2) heterojunction with a responsivity of8.6×10^(3) A·W^(-1)and a detectivity of 1.26×10^(14)Jones at405 nm laser was ***,the typical synaptic behavior was successfully simulated,including postsynaptic currents(PSCs),the transition from shortterm plasticity(STP)to long-term plasticity(LTP).When VO_(2) converts from the semiconductor state to the metal state,the HfS_(2)/VO_(2) heterojunction transforms into a Schottky heterojunction from a TypeⅡheterojunction with ***'s important,the heterojunction still exhibits excellent responsivity and detectivity,as well as stability of synaptic *** addition,the classical Pavlovian conditioning experiment is simulated under different laser intensity to study the brain's associative learning *** results demonstrate that the HfS_(2)/VO_(2) heterojunction synapse exhibits significant responsivity and detectivity and is adaptable to high-temperature environments,showing great potential for neuromorphic computational applic ations.

关键词： HfS_(2) VO_(2) Phase transition Photoelectric synapse Heterojunction