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酸浸猪粪磷形态转变及强化蓝铁矿回收的研究

生态与农村环境学报 2024年第9期40卷 1239-1250页

作者：张雷梁嘉林李城坚麦志宏徐智敏李月桂刘晖仲恺农业工程学院资源与环境学院广东广州510225 广州市增城区永宁街生态环境保护和水务综合服务中心广东广州511358

猪粪因其磷含量高而成为具有前景的磷回收原料。为了提高猪粪中磷的回收效果,考察了硫酸(H_(2) SO_(4))、盐酸(HCl)、草酸(H_(2) C_(2) O_(4))和抗坏血酸(C_(6)H_(8)O_(6))4种浸提剂的酸浸浓度、酸浸时间以及液固比对猪粪释磷效果的影响... 详细信息

猪粪因其磷含量高而成为具有前景的磷回收原料。为了提高猪粪中磷的回收效果,考察了硫酸(H_(2) SO_(4))、盐酸(HCl)、草酸(H_(2) C_(2) O_(4))和抗坏血酸(C_(6)H_(8)O_(6))4种浸提剂的酸浸浓度、酸浸时间以及液固比对猪粪释磷效果的影响,以及对砷(As)、铬(Cr)、铜(Cu)和锌(Zn)等重金属元素浸出行为的影响;通过C-J连续提取法对比分析4种酸处理前后的磷形态,探明猪粪中磷形态转化规律;最后探讨了二价铁(Fe^(2+))诱导结晶生成蓝铁矿的可行性。结果表明,H_(2) C_(2) O_(4)酸浸释磷性能优于H_(2) SO_(4)和HCl,显著优于C_(6)H_(8)O_(6)。猪粪样品经4种提取液酸浸后,重金属元素释出量大小为Zn>Cu>As>Cr;与H_(2) SO_(4)和HCl相比,H_(2) C_(2) O_(4)对重金属元素的浸出量更低。H_(2) SO_(4)、HCl、H_(2) C_(2) O_(4)和C_(6)H_(8)O_(6)对固相磷中铝结合态磷(Al-P)和钙结合态磷(Ca-P)均具有较优的转化效果,转化率>80%;而对于固相磷中的交换态磷(Ex-P)、液相磷中的颗粒态磷(PP)和溶解性还原磷(RDP),与其他3种酸相比,H_(2) C_(2) O_(4)对其具有更高的转化效率。经综合比选,明确H_(2) C_(2) O_(4)为猪粪磷的最佳浸提剂。在H_(2) C_(2) O_(4)浓度为0.10 mol·L^(-1)、酸浸时间为60 min和液固比为50 mL·g^(-1)条件下处理猪粪,液相中可溶性正磷酸盐(Ortho-P)含量从188 mg·L^(-1)提高到882 mg·L^(-1),释磷量从9.42 mg·g^(-1)提升到44.1 mg·g^(-1),效率提升369%。采用Fe^(2+)诱导结晶生成蓝铁矿回收上清液中的磷,通过X射线衍射仪(XRD)、X射线光电子能谱(XPS)和扫描电镜(SEM)等表征手段得出,反应合成的磷回收产物为纯度较高的蓝铁矿。研究成果可为猪粪中磷回收率和回收产物价值的提升提供依据。

关键词：猪粪磷回收磷形态酸浸蓝铁矿

The convergence rate and necessary-and-sufficient condition for the consistency of isogeometric collocation method

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Applied Mathematics(A Journal of Chinese Universities) 2022年第2期37卷 272-289页

作者： LIN Hong-wei XIONG Yun-yang HU hui YAN jia-cong HU Qian-qian School of Mathematical Science Zhejiang UniversityHangzhou 310027China Department of Mathematics Zhejiang Gongshang UniversityHangzhou 310018China

Although the isogeometric collocation(IGA-C)method has been successfully utilized in practical applications due to its simplicity and efficiency,only a little theoretical results have been established on the numerical analysis of the IGA-C *** this paper,we deduce the convergence rate of the consistency of the IGA-C ***,based on the formula of the convergence rate,the necessary and sufficient condition for the consistency of the IGA-C method is *** results advance the numerical analysis of the IGA-C method.

关键词： isogeometric collocation consistency necessary and sufficient condition convergence rate

早产小于胎龄儿校正0~24月龄追赶生长的纵向研究

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中国当代儿科杂志 2024年第1期26卷 72-80页

作者：李佳美谢群英文羽祺宋燕燕梁会营胡艳广州市妇女儿童医疗中心儿童保健部广东广州510623 中国医科大学公共卫生学院辽宁沈阳110122

目的了解早产小于胎龄儿(small for gestational age,SGA)和适于胎龄儿(appropriate for gestational age,AGA)校正0~24月龄期间生长发育状况和差异,为早产儿早期健康干预提供依据。方法回顾性选取2019年7月—2022年7月在广州市妇女儿... 详细信息

目的了解早产小于胎龄儿(small for gestational age,SGA)和适于胎龄儿(appropriate for gestational age,AGA)校正0~24月龄期间生长发育状况和差异,为早产儿早期健康干预提供依据。方法回顾性选取2019年7月—2022年7月在广州市妇女儿童医疗中心定期保健的824例早产儿作为研究对象,其中SGA 144例,AGA 680例。分析和比较SGA组和AGA组出生及校正0~24月龄的体格发育数据。结果SGA组在校正0~18月龄期间的体重和身长均落后于同月龄AGA组(P0.05)。校正24月龄时,85%(34/40)SGA早产儿和79%(74/94)AGA早产儿完成追赶生长。按胎龄分层分析的结果显示:胎龄<34周SGA亚组体重、身长在校正0~9月龄与胎龄<34周和≥34周AGA亚组比较差异有统计学意义(P<0.05);胎龄≥34周SGA亚组体重、身长分别在校正0~18月龄和校正0~12月龄与胎龄<34周和≥34周AGA亚组比较差异有统计学意义(P<0.05)。胎龄<34周和≥34周SGA早产儿追赶生长分别主要发生在校正0~12月龄、校正0~18月龄。结论SGA早产儿生命早期体格发育落后于AGA早产儿,但在校正24月龄时实现追赶生长的比例高于AGA早产儿。胎龄<34周SGA早产儿实现追赶生长的时间早于胎龄≥34周SGA早产儿。

关键词：小于胎龄儿适于胎龄儿体格发育追赶生长早产儿

Broadband topological valley-projected edge-states transport in composite structure phononic crystal

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Chinese Physics B 2021年第8期30卷 418-423页

作者： Hong-yong Mao Fu-jia Chen Kai Guo Zhong-Yi Guo School of Computer and Information Hefei University of TechnologyHefei 230009China

The topological valley transport,realized in phononic crystals,has aroused tremendous interest in these *** previous researches have further promoted the development of this transport ***,the bandwidth of the valley-projected edge mode has been an essential research *** is well known,the broadband will improve the adaptability of the acoustic edge-states,which will be more conducive to the transmission of ***,in this paper,we present a composite structure,composed of the atoms with different shapes forming a hexagonal lattice,which can achieve larger bandwidth than a single ***,the results demonstrate that the topological protected edge states are also observed in our ***,the backscattering suppressions from associated valley-protected edge states under certain perturbations have also been investigated and *** work can provide a new idea for designing acoustic devices based on valley degree of freedom.

关键词： valley transport composite structures broadband edge-states

Ni doping effects in YBa_2Fe_3O_(8+w)

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Journal of Modern Transportation 2011年第4期19卷 247-251页

作者： Xiaoyu GUAN yong ZHAO Xiaoqiu jia MOE Key Laboratory of Advanced Materials Technology Southwest Jiaotong University Chengdu 610031 China Superconductor Research and Development Center Southwest Jiaotong University Chengdu 610031 China School of Materials Science and Engineering University of New South Wales Sydney 2052 NSW Australia School of Traffic and Transportation Southwest Jiaotong University Chengdu 610031 China

By doping Ni into YBa2Fe308＋w （YBFO） system, we obtained the phase YBa2Fe3-xNixO8＋w （YBFNO, x=0, 0.05, 0.10, 0.15, 0.30, 0.50, 1.00）. This paper discusses the changes in crystal structural, resistivity and magnetoresistivity （MR） of YBFO samples due to the incorporation of transition metal Ni. The results show that Ni substitution for partial Fe in YBFO does not substantially transform the structure of parent phase, but results in tiny changes in the lat- tice parameters. The YBFO crystal with Ni doped is semiconducting.

关键词： YBa2Fe3Oa+w Ni doping crystal structure magnetoresistivity

Enhancement of the Photocatalytic Oxygen Production by Tantalum Nitride Supported Fe Atom Embedded N-Doped Graphene Oxide

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Chinese Journal of Chemistry 2023年第3期41卷 280-286页

作者： Hanxiang Chen jia Yan Zhao Mo Jinyuan Liu Xianglin Zhu Huaming Li hui Xu School of the Environment and Safety Engineering School of the Institute for Energy Researchand School of the Materials Science&EngineeringJiangsu UniversityZhenjiangJiangsu212013 China

Energy crises and environmental pollution have become urgent problems with human civilization *** technology is a green method to deal with these *** key to improve photocatalytic efficiency lies in the effective separation of photogenerated electron-hole *** this work,we designed the Fe atom embedded N-doped graphene oxide(Fe-NGO)supporting on tantalum nitride(Ta_(3)N_(5))catalyst,which was employed to improve the photocatalytic oxygen production *** oxygen production of 5 wt%Fe atom embedded N-doped graphene oxide supporting on tantalum nitride(Fe-NGO/Ta_(3)N_(5))was 184.7μmol·g^(-1),about 3.5 times higher than that of the pure Ta_(3)N_(5).The introduction of the cocatalyst Fe-NGO acting as an electron conductor in the Fe-NGO/Ta_(3)N_(5) accelerates the carrier migration of Ta_(3)N_(5) and further enhances the photocatalytic oxygen production activity.N-doping increases the conductivity of graphene oxide(GO),and Fe atoms are used as the reactive sites to promote the combination of electron and sacrificial agent in the *** work may provide insights into the research of new carbon.

关键词： Photocatalysis Electron transfer Fe atom embedded N-doped graphene oxide Ta_(3)N_(5) Catalysis

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淬火处理对中锰钢组织和性能的影响

材料热处理学报 2024年第1期45卷 123-130页

作者：李帅帅王昕贾建文杜华云卫英慧侯利锋太原理工大学材料科学与工程学院山西太原030024 山西省金属材料腐蚀与防护工程技术研究中心山西太原030024

中锰钢通过微观组织调控,可实现优异的强度-塑韧性协同增长,是第三代先进高强钢的潜力材料。采用不同淬火工艺来调控Fe-10Mn-0.44C-1.87Al-0.67V中锰钢的微观组织,并结合VC的析出来优化其性能。结果表明:经1020℃淬火+300℃回火后,中锰... 详细信息

中锰钢通过微观组织调控,可实现优异的强度-塑韧性协同增长,是第三代先进高强钢的潜力材料。采用不同淬火工艺来调控Fe-10Mn-0.44C-1.87Al-0.67V中锰钢的微观组织,并结合VC的析出来优化其性能。结果表明:经1020℃淬火+300℃回火后,中锰钢的组织为板条状马氏体+残留奥氏体,形变时残留奥氏体发生相变诱导塑性效应,使其具有优异的塑性。经800℃淬火+250℃回火后,组织为细小的马氏体、细小弥散分布的VC和少量残留奥氏体,通过位错强化、细晶强化和析出强化作用使中锰钢具有最佳的力学性能,屈服强度为1190 MPa,抗拉强度为1473 MPa,伸长率为22%,强塑积为32.4 GPa%。

关键词：中锰钢淬火处理残留奥氏体马氏体

Isolation and Identification of Phosphobacteria in PoplarRhizosphere from Different Regions of China

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Pedosphere 2011年第1期21卷 90-97页

作者： LIU hui WU Xiao-Qin REN jia-Hong YE jian-Ren College of Forest Resources and Environment Nanjing Forestry University Nanjing 210037 (China)

A few soil microorganisms can convert insoluble forms of phosphorus （P） to an accessible form to increase plant yields The objectives of this study were to isolate, screen and identify the phosphobacteria, i.e., phosphate-solubilizing bacteria （PSB） and phosphate-mineralizing bacteria （PMB）, in some poplar plantations and to select potential microbial inoculants that could increase the P uptake by plants. Seventy four PSB strains and 138 PMB strains were preliminarily screened from 797＂colonies isolated from the rhizosphere soil of poplar by the visible decolorization in the National Botanical Research Institute＇s phosphate growth medium （NBRIP） containing a pH indicator of bromophenol and by the clear/halo zone on yeast malt agar plate, respectively. Then, based on the solubilization of Ca3（PO4）2 in liquid NBRIP medium and the mineralization of lecithin in liquid Menkina medium, 15 PS1R strains and 7 PMB strains were further determined for their abilities to solubilize Ca3（PO4）2 and to mineralize lecithin. The results showed that the 15 PSB strains exhibited inorganic P-solubilizing abilities ranging between 376.62 and 669.56 mg L-1 and the 7 PMB strains exhibited organic P-mineralizing abilities vaxying from 0.32 to 1.56 mg L-1 three days after incubation. Three of PSB strains with the highest P-solubilizing ability, named JW-JS1, JW-JS2 and JW-SX2, were all preliminarily identified as Pseudomonas ftuorescens, while two of PMB strains with the highest P-mineralizing ability, named JYZ-SD1 and JYT-JS2, were preliminarily identified as Bacillus cereus and Bacillus subtilis, respectively. All the efficient PSB and PMB strains should be further studied under both pot culture and field conditions to test their beneficial effects on poplar.

关键词： Bacillus cereus Bacillus subtilis phosphobacteria poplar Pseudomonas fluorescens

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纳米抗体在食源性微生物污染检测中的应用

食品安全质量检测学报 2024年第9期15卷 11-18页

作者：高家昊郦娟褚冲付诗慧辛博曾慧君武汉食品化妆品检验所国家市场监管重点实验室(食用油质量与安全)武汉430040

食源性微生物污染对人们的生命健康产生威胁,检测技术大多为传统的培养方法,结果准确但操作烦琐,检测周期长。纳米抗体作为一种新的抗原识别和调控工具,具备分子小、免疫原性弱、水溶性好、组织渗透性强、稳定性和亲和力强、易于表达和... 详细信息

食源性微生物污染对人们的生命健康产生威胁,检测技术大多为传统的培养方法,结果准确但操作烦琐,检测周期长。纳米抗体作为一种新的抗原识别和调控工具,具备分子小、免疫原性弱、水溶性好、组织渗透性强、稳定性和亲和力强、易于表达和修饰的优势,已广泛应用于食品安全快速检测领域。本文首先介绍了纳米抗体的结构特征,作为检测工具的优势,筛选与表达的基本情况。然后介绍了纳米抗体在沙门氏菌、金黄色葡萄球菌、单核细胞增生李斯特氏菌等食源性致病菌检测中的应用,并补充了纳米抗体检测食品中诺如病毒和生物毒素的研究。最后对纳米抗体在食源性微生物污染检测中的应用进行了展望,以期为开发更加高效、准确、便捷的检测方法提供参考。

关键词：纳米抗体食源性致病菌诺如病毒生物毒素检测