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Freeze-drying assisted liquid exfoliation of BiFeO_(3) for pressure sensing

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Frontiers of physics 2023年第6期18卷 193-201页

作者： Yuping Li Mengwei Dong Xuejie Zou jinhao zhang Jian zhang Xiao Huang Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China

Breaking up bulk crystals of functional materials into nanoscale thinner layers can lead to interesting properties and enhanced functionalities due to the size and interface ***,unlike the van der Waals layered crystals,many materials cannot be exfoliated into thin layers by liquid ***_(3) is a piezoelectric ceramic material,which is commonly synthesized as bulk crystals,limiting its wider *** this contribution,a freeze-drying assisted liquid exfoliation method was adopted to fabricate thin-layered BiFeO_(3) nanoplates with lateral sizes of up to 500 nm and thicknesses of 10−20 *** freeze-drying process showed a vital role in the preparation process by imposing stress on the dispersed BiFeO_(3) crystals during the liquid-to-solid-to-gas transition of the *** stress resulted in lattice strains in the freeze-dried BiFeO_(3) crystals,which enabled their further exfoliation under subsequent *** the intrinsic piezoelectric effect of BiFeO_(3),pressure sensors based on bulk and thin-layer BiFeO_(3) were also *** pressure sensor based on BiFeO_(3) nanoplates exhibited a largely enhanced sensitivity with a wider working range than the bulk counterpart,because of the stronger piezoelectric effect induced and the extra electrical charges at abundant interlayer *** suggest that the freeze-drying assisted liquid exfoliation method can be applied to other non-van der Waals crystals to bring about more functional material systems.

关键词： BiFeO_(3)nanoplates liquid exfoliation piezoelectricity pressure sensor

Ultra-broadband edge-state pair for zigzag-interfaced valley Hall insulators

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 81-89页

作者： jinhao zhang Fengwen Wang Ole Sigmund Liang Gao Rasmus E.Christiansen State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering Technical University of DenmarkKongens Lyngbv 2800Denmark

The existence of a single topologically protected edge state in the first bulk bandgap for acoustic/elastic valley Hall insulators(VHIs)with zigzag interface configurations(ZICs)is well ***,in this work,we show that an ultra-broadband edgestate pair in this bandgap can be created using the inverse design by topology *** valley Hall insulator design increases the operational bandwidth 121%compared with an existing valley Hall insulator from recent literature and exhibits extreme field confinement,where more than 99%of the field intensity is concentrated within three unit-cells from the ***-way propagation and topological robustness towards small cavity defects are confirmed for the full *** exploitation of such edge-state pairs of valley Hall insulators opens an avenue for realizing broadband confined edge *** tests for disorder and bend defects,we show that the additional ZIC,with a different operational frequency interval,encountered at the defects,degrades the transmission for bend and disorder defects which may prove significant for the application of *** an alternative topology optimization method based on two ZICs,we further increase their common operational bandwidth.

关键词： valley Hall insulators zigzag interface configuration edge-state pair topology optimization

黄腐酸钾对不同氯盐胁迫下桧柏生长的缓解效应

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林业科学 2024年第4期60卷 99-108页

作者：房有鑫曹帮华郭龙梅毛培利庞元湘张金颢王志恒李鹏飞山东农业大学黄河下游森林培育国家林业和草原局重点实验室泰安271018

【目的】探究高浓度氯盐胁迫下桧柏容器苗施加不同质量分数黄腐酸钾(FA-K)后的生长和生理特性,揭示FA-K缓解高浓度氯盐胁迫下桧柏的生理响应机制及差异性,为冬季北方高速公路中央分隔绿化带桧柏的管理维护提供技术支撑。【方法】选取2... 详细信息

【目的】探究高浓度氯盐胁迫下桧柏容器苗施加不同质量分数黄腐酸钾(FA-K)后的生长和生理特性,揭示FA-K缓解高浓度氯盐胁迫下桧柏的生理响应机制及差异性,为冬季北方高速公路中央分隔绿化带桧柏的管理维护提供技术支撑。【方法】选取2年生桧柏容器苗开展盆栽试验,以正常生长为对照,设置0.7%NaCl和0.7%CaCl_(2)2种盐分,每种盐分设置0、0.05%、0.10%、0.30%和0.50%5种质量分数FA-K处理,测定各处理下桧柏苗生长指标(苗高生长量、地径生长量、生物量、根冠比)、光合色素含量(叶绿素a、叶绿素b、总叶绿素、类胡萝卜素)、相对电导率、丙二醛含量、渗透调节物质(脯氨酸、可溶性糖)含量、超氧化物歧化酶和过氧化物酶活性。【结果】1)0.7%CaCl_(2)胁迫对桧柏苗生长的抑制作用大于0.7%NaCl胁迫;0.7%CaCl_(2)胁迫下桧柏苗除可溶性糖和类胡萝卜素含量低于NaCl胁迫外,其他生理指标(叶绿素a含量、叶绿素b含量、总叶绿素含量、丙二醛含量、脯氨酸含量、相对电导率、过氧化物酶和超氧化物歧化酶活性)均高于NaCl胁迫;2)2种盐胁迫下,施加FA-K均使桧柏苗苗高生长量、地径生长量、生物量增加,叶绿素a、叶绿素b、总叶绿素、类胡萝卜素含量上升,相对电导率和丙二醛含量下降,超氧化物歧化酶和过氧化物酶活性、脯氨酸和可溶性糖含量呈低-高-低的变化趋势,0.50%FA-K下2种盐胁迫的幼苗生长接近对照;3)相较0.7%NaCl胁迫,FA-K对0.7%CaCl_(2)胁迫表现出更好的缓解作用。【结论】高浓度氯盐胁迫显著抑制桧柏苗生长和存活,0.7%CaCl_(2)抑制作用比0.7%NaCl强;FA-K能够有效缓解NaCl和CaCl_(2)胁迫,0.50%FA-K缓解效果较佳。

关键词：桧柏盐胁迫黄腐酸钾融雪剂缓解作用

Rare-earth,nitrogen-rich,oxygen heterocyclic supramolecular compounds(Nd,Sm,and Eu):Synthesis,structure,and catalysis for ammonium perchlorate

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Journal of Rare Earths 2022年第3期40卷 428-433,I0003页

作者： Wenjia Hao Tao Huang Bo Jin jinhao zhang Juan Shen Rufang Peng State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyang 621010China

Three novel rare-earth,nitrogen-rich and oxygen heterocyclic supramolecular complexes,namely[Nd(BTF)_(2)(H_(2)O)_(5)]_(n),[Sm(BTF)_(2)(H_(2)O)_(5)]_(n),and[Eu(BTF)_(2)(H_(2)O)_(5)]_(n),were synthesized.A single crystal was obtained by the solvent evaporation method,and the structure and coordination mode of metal complexes were determined by single crystal X-ray *** show that the supramolecular complexes contain many hydrogen bonds and thus have good thermal stability(T_(dec)>540 K).The thermal decomposition of ammonium perchlorate(AP)catalyzed by the complexes was investigated by differential thermal analysis,which reveals a pre-eminent catalytic effect on *** high temperature decomposition peak of AP can be advanced by nearly 90 K at the amount of added complexes of 10 wt%,and the activation energy of AP descent range is from 70 to 150 kJ/*** other properties were fully characterized through elemental analysis and Fourier transform infrared spectroscopy.

关键词： Nitrogen rich oxygen heterocycles Lanthanide supramolecular complexes Ammonium perchlorate Thermal decomposition Rare earths

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基于热流密度的石墨烯发热膜电路设计

材料导报 2024年第S1期38卷 100-103页

作者：张晋豪袁英才李恒王鑫李文浩郭淼胡乃奇张宇朋数字化印刷装备北京市重点实验室北京102600 印刷装备北京市高等学校工程研究中心北京102600 北京市印刷电子工程技术研究中心北京102600 北京印刷学院机电工程学院北京102600

在石墨烯发热膜功能需要的基础上,通过热传导分析,提出热流密度计算公式。基于热流密度分析结果和石墨烯原膜电学特性,提出石墨烯加热膜电路设计方法。对丝网印制石墨烯原膜,在导电特性测试的基础上,运用基于热流密度的电路设计方法,制... 详细信息

在石墨烯发热膜功能需要的基础上,通过热传导分析,提出热流密度计算公式。基于热流密度分析结果和石墨烯原膜电学特性,提出石墨烯加热膜电路设计方法。对丝网印制石墨烯原膜,在导电特性测试的基础上,运用基于热流密度的电路设计方法,制备出石墨烯加热膜。设计实例的理论计算与实测结果基本一致,表明该设计方法切实可行。

关键词：石墨烯电路设计电热性能发热膜

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藜麦种质资源的茎秆性状评价

山西农业大学学报（自然科学版） 2024年第4期44卷 1-9页

作者：张永康王树彦张锦豪李佳娜邢路虹刘瑞香郭占斌内蒙古农业大学农学院内蒙古呼和浩特010019 内蒙古农业大学沙漠治理学院内蒙古呼和浩特010011 内蒙古益稷生物科技有限公司内蒙古呼和浩特010011

[目的]藜麦种子具有全谷物高营养的品质,但倒伏是制约藜麦产量的重要因素之一,明确藜麦作物茎秆的抗倒伏特性,有利于筛选具有不同倒伏能力的藜麦品种(系),为藜麦抗倒伏育种鉴定、评价和创新提供理论依据。[方法]本研究根据株高、籽粒大... 详细信息

[目的]藜麦种子具有全谷物高营养的品质,但倒伏是制约藜麦产量的重要因素之一,明确藜麦作物茎秆的抗倒伏特性,有利于筛选具有不同倒伏能力的藜麦品种(系),为藜麦抗倒伏育种鉴定、评价和创新提供理论依据。[方法]本研究根据株高、籽粒大小、倒伏特性和生育期长短选取22份供试藜麦品种(系)并对其生育期、茎秆表型性状、茎秆机械强度和生理特征共16个指标进行测定和分析。[结果]22份藜麦品种(系)具有较高度的遗传变异,14个性状的变异系数为12.39%~81.08%,倒伏指数的变异系数最大,纤维素含量的变异系数最小。多因素方差分析得出作物倒伏特性与品种(系)、生育期、机械强度指标三者具有显著互作关系。相关性分析发现弯曲力矩、倒伏指数与茎秆表型性状、机械强度指标具有显著或极显著相关关系。基于13个茎秆特性指标以及隶属函数均值进行聚类分析可将22份藜麦品种(系)划分为3个类群,第Ⅰ类为抗倒伏组,第Ⅱ、Ⅲ类群为易倒伏组。多元线性回归分析得出,11个茎秆特性指标与倒伏指数和倒伏率做回归,R2均大于0.85。22份藜麦品种(系)的隶属函数均值为2.21~1.47,倒伏率范围为18.13%~91.83%,倒伏等级为2~5级。[结论]22份藜麦品种(系)农艺性状遗传多样性较为丰富,可为藜麦种质资源的创造提供参考。倒伏指数和弯曲力矩对作物倒伏能力评价具有重要作用。综合分析后推测K157、W120为抗倒伏品系,Y4、W26为易倒伏品系。

关键词：倒伏性茎秆特性倒伏指数弯曲力矩

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Catalytic thermal decomposition of ammonium perchlorate by a series of lanthanide EMOFs

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Journal of Rare Earths 2023年第4期41卷 516-522页

作者： jinhao zhang Bo Jin Wenjia Hao Yulan Song Chenjie Hou Tao Huang Rufang Peng State Key Laboratory of Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China

Given their unique and excellent properties,metal-organic frameworks(MOFs)materials have been used in many scientific *** use energetic materials as ligands,which can provide part of the energy for the system while catalyzing ammonium *** energetic material 1.1'-dihydroxyazotetrazole(H_(2)AzTO),as a high-energy nitrogen-rich material,was selected as a *** kinds of La^(3+),Ce^(3+),Pr^(3+),Nd^(3+),and Sm^(3+)lanthanide EMOFs were synthesized and *** crystal X-ray diffraction tests were conducted to obtain the crystal structures of EMOFs 1-5,which indicate that they have similar crystal *** thermal stabilities of EMOFs 1-5,which are obtained by differential scanning calorimetry(DSC)tests,are improved compa red with that of the *** results of thermicdecomposition of ammonium perchlorate(AP)and AP mixtures with 10 wt%EMOFs 1-5 show that except for AP mixed with 10 wt%co mpound 2,the high-temperature decomposition peak tempe rature of AP mixed with other compounds is significantly advanced(up to 59.3-88.3 K),and the decomposition of AP is continuous and *** 3-5 have good application prospects for the catalytic thermicdecomposition of AP.

关键词： 1 1'-dihydroxyazotetrazole EMOFs Catalytic thermal decomposition Ammonium perchlorate Rare earths

甜玉米轮作配施万寿菊秸秆返田防治白菜根肿病机理初探

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中国农业大学学报 2024年第1期29卷 53-65页

作者：周星海魏方俊张晋豪贺赛雅邱玥艾瑛魏兰芳姬广海云南农业大学植物保护学院/省部共建云南生物资源保护与利用国家重点实验室云南省玉溪市通海县植保植检站云南农业大学农科基础实验教学中心

为研究甜玉米轮作配施万寿菊秸秆返田模式对白菜根肿病的防治机理，并为该种植模式提供理论基础和技术支撑，通过荧光定量PCR技术、非靶标代谢组学技术、高通量测序技术和田间试验验证，探究了甜玉米轮作配施万寿菊秸秆返田处理(CrMs)... 详细信息

为研究甜玉米轮作配施万寿菊秸秆返田模式对白菜根肿病的防治机理，并为该种植模式提供理论基础和技术支撑，通过荧光定量PCR技术、非靶标代谢组学技术、高通量测序技术和田间试验验证，探究了甜玉米轮作配施万寿菊秸秆返田处理(CrMs)对白菜根肿病的田间防效、休眠孢子数量以及白菜根际土中代谢物和微生物种类的影响。结果表明：CrMs处理对白菜根肿病的田间防效为61.11%；土壤中根肿菌休眠孢子数量由轮作前的1×105.92个/g降到了1×103.73个/g;CrMs处理改变了白菜根际土中的代谢物组分，提高了脱氧鹅胆酸(Chenodeoxycholic acid)、α-亚麻酸(Alpha-Linolenic acid)和4-异丙基苯甲酸(4-Isopropylbenzoic acid)等代谢物含量，降低了油酸酰胺(Oleamide)和蜜二糖(Melibiose)等代谢物含量；相关性分析表明，α-亚麻酸和脱氧鹅胆酸等与根肿菌属(Plasmodiophora)相对丰度负相关，油酸酰胺等与根肿菌属相对丰度正相关；CrMs处理丰富了白菜根际微生物多样性，改善了土壤微生物群落组成，显著提高了芽胞杆菌属(Bacillus)、慢生根瘤菌属(Bradyrhizobium)、溶杆菌属(Lysobacter)和链霉菌属(Streptomyces)等的相对丰度，降低了根肿菌属、镰刀菌属(Fusarium)和螺旋线虫属(Helicotylenchus)的相对丰度。综上，甜玉米轮作+万寿菊秸秆返田的新模式是防治白菜根肿病的重要栽培措施，可为根肿病的绿色防治提供关键的技术参考。

关键词：白菜根肿病轮作代谢组微生物多样性

云南农业碳排放强度与新型城镇化相互影响研究

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西南林业大学学报（社会科学） 2024年第2期8卷 71-79页

作者：张晋豪邵小育赵丽余雨薇西南林业大学经济管理学院云南昆明650233

探究农业碳排放强度与新型城镇化的相互影响,对加快农业绿色转型,构建绿色低碳城市,实现全国碳达峰、碳中和目标意义重大。基于2010—2020年云南16个州市的面板数据,构建新型城镇化与农业碳排放强度的评价指标体系,分析云南各地区碳排... 详细信息

探究农业碳排放强度与新型城镇化的相互影响,对加快农业绿色转型,构建绿色低碳城市,实现全国碳达峰、碳中和目标意义重大。基于2010—2020年云南16个州市的面板数据,构建新型城镇化与农业碳排放强度的评价指标体系,分析云南各地区碳排放强度的时空变化情况和碳排放强度结构,并利用向量自回归模型(VAR)探究新型城镇化与农业碳排放强度之间的相互影响。结果表明:新型城镇化与农业碳排放强度之间呈显著负相关;新型城镇化与农业碳排放强度相互抑制作用会随着时间的推移而减弱;从新型城镇化与农业碳排放强度相互影响程度看,农业碳排放强度的影响效力更强。鉴于此,提出加快推进新型城镇化建设、加快产业互动、推进要素合理流动与资源有效配置、实现农业经济绿色低碳发展和加快农业现代化转型升级和大力发展绿色农业助力绿色低碳城镇建设的建议。

关键词：农业碳排放城镇化绿色低碳向量自回归