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磁化水复合保氮剂对堆肥过程中氮素损失和微生物群落的影响

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农业工程学报 2024年第12期40卷 202-212页

作者：段曼莉徐洪波覃振伦吴双陈浩楠王全九周蓓蓓西安理工大学省部共建西北旱区生态水利国家重点实验室西安710048

为了研究不同保氮剂对快速堆肥过程中氮素损失及微生物群落的影响,该研究以牛粪和秸秆为原料,进行了25 d的好氧堆肥试验。试验中设置了磁化水(T1)、磁化水复合生物炭(T2)、磁化水复合硫酸亚铁(T3)、磁化水复合巨大芽孢杆菌(T4),不添加... 详细信息

为了研究不同保氮剂对快速堆肥过程中氮素损失及微生物群落的影响,该研究以牛粪和秸秆为原料,进行了25 d的好氧堆肥试验。试验中设置了磁化水(T1)、磁化水复合生物炭(T2)、磁化水复合硫酸亚铁(T3)、磁化水复合巨大芽孢杆菌(T4),不添加磁化水和保氮剂作为对照组(CK)。试验结果表明:与对照组相比,T1、T2、T3、T4均延长了堆肥的高温期,分别延长了4、5、2、4 d。T1、T2、T4的最高温较CK分别提高了3.5、8、0.5℃。从温度上来看,T1未进行二次腐熟,缩短了堆肥周期;各处理组的总氮含量较堆肥初始时提高了14.04%、18.89%、37.56%、36.27%、28.47%,总氨气排放量分别为8.12、4.37、6.60、7.32、3.95 g/d。与对照组相比,T1、T2、T3、T4均提高了堆肥的总氮含量,降低了总氨气排放量。T2总氮含量高于其他处理,T1总氨气排放量低于其他处理;与CK相比,T2促进了氮循环基因gdhA的绝对丰度,抑制了拟杆菌门的相对丰度,促进了氮素循环、堆肥进程。与CK相比T3促进了固氮基因nifH、氮循环基因gdhA的绝对丰度,促进了变形菌门的相对丰度,有利于氮素的循环;此外,结构方程显示,T2与NH_(3)排放量呈显著负效应,NH_(3)排放量与总氮损失TN_(loss)呈显著正效应,解释了生物炭通过吸附NH_(3),减少氮素损失。T3与pH值呈显著负效应,pH值与NH_(3)排放量呈显著正效应,NH_(3)排放量与TN_(loss)呈显著正效应,FeSO4的加入降低了堆体的pH值,减少氨气的排放,进而减少氮素损失;综合堆肥过程中的温度、总氮含量、总氨气排放量、氮功能基因的绝对丰度、微生物的相对丰度以及结构方程模型分析,磁化水复合生物炭在快速堆肥过程中表现出最佳的保氮效果和理想的腐熟程度。

关键词：磁化水生物炭硫酸亚铁巨大芽孢杆菌好氧堆肥氮损失

脑卒中患者医院-家庭过渡期疾病体验质性研究的Meta整合

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中华护理杂志 2024年第16期59卷 2030-2036页

作者：郭张慧段煜屈简妮焦萌陈颖宇孙超郭红北京中医药大学护理学院北京市100029 北京医院护理部

目的系统评价脑卒中患者在医院-家庭过渡期的真实经历,以期为临床更好地开展过渡期护理提供参考。方法计算机检索PubMed、Web of Science、Embase、CINAHL、Cochrane Library、中国知网、万方数据库、维普数据库和中国生物医学文献数据... 详细信息

目的系统评价脑卒中患者在医院-家庭过渡期的真实经历,以期为临床更好地开展过渡期护理提供参考。方法计算机检索PubMed、Web of Science、Embase、CINAHL、Cochrane Library、中国知网、万方数据库、维普数据库和中国生物医学文献数据库中关于脑卒中患者医院-家庭过渡期真实经历的质性研究,检索时限为建库至2023年10月。文献质量评价采用澳大利亚乔安娜布里格斯研究所循证卫生保健中心质性研究质量评价标准(2016版),采用汇集性整合方法对结果进行整合。结果共纳入14篇文献,提炼出48个研究结果,归纳为9个类别,综合为3个整合结果:出院准备期处于矛盾之中;出院后生活发生改变,存在多种过渡障碍因素;积极应对疾病,经历自身成长。结论脑卒中患者的医院-家庭过渡期是患者康复的关键时期,医护人员应加强过渡期出院准备服务的实施,加强医院与家庭和社区衔接,关注患者心理体验,以帮助脑卒中患者实现从医院到家庭的顺利过渡。

关键词：脑卒中医院-家庭过渡期质性研究 Meta整合循证护理学

Nanoparticles as contrast agents for photoacoustic brain imaging

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聚集体(英文)

聚集体(英文) 2021年第1期2卷 4-19页

作者： Xingang Liu Yukun duan Bin Liu Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhouChina

Photoacoustic(PA)imaging has emerged as a promising technique for real-time detection and diagnosis of brain-related pathologies,due to its advantages in deep penetration of ultrasound imaging and high resolution of optical fluorescence *** herein provide an overview on the latest developments of nanoparticles as contrast agents specifically designed for PA imaging of brain tumor,and brain vascular and other brain-related *** design considerations of high-performance PA contrast agents for brain-related disease diagnosis are discussed,which include(1)strong absorption in NIR or NIR-Ⅱ window,(2)good biocompatibility,(3)high photothermal conversion efficiency,(4)precise nanostructure control,and(5)spe-cific targeting *** and perspectives of developing more robust and universal contrast agents for enhanced PA imaging are discussed at the end.

关键词： brain imaging contrastagent nanoparticle photoacousticimaging

A Virtual Puncture Surgery System Based on Multi-Layer Soft Tissue and Force Mesh

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Computers, Materials & Continua 2018年第12期57卷 505-519页

作者： Xiaorui Zhang Jiali duan Lifeng Zhu Ladislav Kavan Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science&TechnologyNanjing210044China School of Instrument Science and Engineering Southeast UniversityNanjing210096China School of Computing University of UtahSalt Lake CityUT 84112-9205USA

Puncture is a common operation in surgery,which involves all kinds of tissue materials with different geometry and mechanical *** a new cross-disciplinary research area,Virtual Surgery(VS)makes simulation of soft tissue in puncture operation possible in virtual *** this paper,we introduce a VS-based puncture system composed by three-layer soft tissue,simulated with spherical harmonic function(SHF),which is covered with a force mesh,constructed by mass spring model(MSM).The two models are combined together with a parameter of SHF named surface radius,which provides MSM with real-time deformation data needed in force ***,force calculation,divided into the surface spring force and the puncture damping force,makes the force presentation better accord to the corresponding tissue ***,a deformation resumption algorithm is leveraged to simulate the resumption phenomenon of the broken tissue *** evaluation experiment,several residents are invited to grades our model along with other four mainstream soft tissue models in terms of 7 different *** the evaluation,the scores are analyzed by a comprehensive weighted grading *** results show that the proposed model has better performance during puncture operation than other models,and can well simulate surface resumption phenomenon when tissue surface is broken.

关键词： Puncture simulation spherical harmonic function mass spring model tissue surface resumption weighted grading evaluation

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云南儿科医生对儿童哮喘认知状况调查

国际医药卫生导报 2024年第12期30卷 2107-2110页

作者：赵家伟段晶彭丽琨郝芮段婧媛马晓林保山市人民医院儿科保山678000 昆明医科大学第一附属医院儿科昆明650032 大理白族自治州人民医院儿三科大理671000 昆明医科大学附属儿童医院呼吸科昆明650103 德宏州人民医院儿科德宏678400

目的了解云南省不同等级医院儿科医生对《中国儿童哮喘行动计划》(China Children Asthma Action Plan,CCAAP)及哮喘指南的认知状况。方法2022年7—12月,对云南省保山、昆明、大理、德宏、红河、玉溪、西双版纳、楚雄、曲靖、临沧、文... 详细信息

目的了解云南省不同等级医院儿科医生对《中国儿童哮喘行动计划》(China Children Asthma Action Plan,CCAAP)及哮喘指南的认知状况。方法2022年7—12月,对云南省保山、昆明、大理、德宏、红河、玉溪、西双版纳、楚雄、曲靖、临沧、文山11个州市的41家不同级别医院395名儿科医师(男132人,女263人,年龄20岁以上)进行了有效调查。采用线上、线下相结合方式进行问卷调查。采用χ^(2)检验、方差分析。结果共收回来自41家医院有效问卷395份。各级别被调查医院儿科医生对儿童哮喘基础知识各问题回答正确率为32.78%(59/180)~97.50%(39/40)、急性期治疗各问题回答正确率为24.44%(44/180)~92.50%(37/40)、后续治疗各问题回答正确率为35.56%(64/180)~100.00%(40/40)。省级三级医院、地市级三级医院儿科医生对儿童哮喘认知情况总体优于二级及一级医院(均P<0.05)。结论云南省各级别医院儿科医生对CCAAP及哮喘指南普遍认知不足,基层医院尤其薄弱。

关键词：儿科医生哮喘问卷调查中国儿童哮喘行动计划

Coupling Relationship Analysis on Households′ Production Behaviors and Their Influencing Factors in Nature Reserves:A Structural Equation Model

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Chinese Geographical Science 2013年第4期23卷 506-518页

作者： WANG Changhai WEN Yali duan Wei HAN Feng School of Economics and Management Beijing Forestry University

A households′production behavior directly influences the quality of the environment and determines the successful development of nature ***,the households′production behaviors are complicated by interrelated factors,such as protection attitudes,resource endowment,and family *** research evaluated households near the Crested Ibis National Nature Reserve in Shaanxi Province,acquiring data from 436 households around Yang County and Ningshan County in the south slope of Qinling Mountains,*** on the collected data,we developed a structural equation model to evaluate the coupling relationships among households′ protection attitudes,production behaviors,resource endowment,and family *** results showed that:1) households with great resource endowment had more negative attitudes,probably due to their greater protection costs;2) the households with higher education levels had worse protection attitudes;3) the households with more family wealth were likely to use fewer fertilizers,pesticides,and firewood;4) the households with more resource endowment showed less production and management behaviors;5) the enhancement of households' attitudes improved production behaviors to protection the environment,but the effects were not statistically *** results provide a basis for the government's protection policy making,exploring the effective management measures that are beneficial for both nature reserve management and community development.

关键词： family wealth protection attitudes production behaviors resource endowment structural equation model Crested Ibis National Nature Reserve

Numerical simulation on bolted rock joint shearing performance

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Mining Science and Technology 2010年第3期20卷 460-465页

作者： SONG Hongwei duan Yanyan YANG Jing School of Architecture and Civil Engineering China University of Mining & Technology Xuzhou 221008 China State Key Laboratory of Geomechanics & Deep Underground Engineering China University of Mining & Technology Xuzhou 221008 China

A Double Shear Model(DSM) was used in a numerical simulation on bolted rock joint shearing *** entire bolt deformed as the letter'U'under a shear load between two *** the bolt-joint intersection,the bolt partly deformed as the letter'Z'.There were two critical points along the bolt:one was at the bolt-joint intersection with zero bending moment and the other at the maximum bending moment(plastic hinge) with zero shear *** blocks on two sides slid along the bolt as it deformed. A separation area was found between the two joint contact surfaces of the middle rock block and sided *** area of separation was related to bolt diameter and external *** assume that this area is related to the work of external *** research is needed.

关键词： bolt rock joint shear numerical simulation

Exogenous application of succinic acid enhances tolerance of Larix olgensis seedling to lead stress

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Journal of Forestry Research 2018年第6期29卷 1497-1505页

作者： Jinfeng Song Hongguang Zhang Chengwei duan Xiaoyang Cui School of Forestry Northeast Forestry University Maoershan Forest Research Station Northeast Forestry University

Larix olgensis A. Henry(Changbai larch) is a productive commercial species and good candidate for afforestation in northeast China. It is widely planted in lead-stressed soils which can induce oxidative damage in this plant. Increasing tolerance to lead(Pb) stress is therefore of keen interest. A greenhouse experiment was conducted to identify the biomass, physiological responses and Pb accumulation of L. olgensis seedlings to Pb stress under succinic acid(SA) application and to explore the interaction of exogenous SA applications and stress resistance. L. olgensis seedlings were planted in Pb-stressed or unstressed haplic cambisols in pots. In Pb-contaminated soils the seedlings were treated daily with concentrations of SA solutions at a rate approximately equivalent to 0, 0.04,0.2, 1.0, or 2.0 mmol kg-1of soil for 10, 20, and 30 days,respectively. Pb treatment induced damage in the seedlings and led to the inhibition of biomass accumulation in roots,stems and leaves, and a rise in Pb accumulation in fine roots and leaves. Malondialdehyde(MDA) content and electrolyte leakage in leaves significantly increased while peroxidase(POD) activities, soluble protein and photosynthetic pigment contents in leaves were all *** toxicity was promoted with increasing Pb treatment times. When Pb-stressed seedlings were exposed to SA(especially 10.0 mmol L-1 over 20 days), the physiological responses for Pb-only were reversed and the biomass of roots, stems, and leaves dramatically *** facilitated Pb uptake in fine roots and leaves but more Pb accumulated in fine roots. The results demonstrate that exogenous SA alleviates Pb-induced oxidative injuries and improves the tolerance of L. olgensis seedlings to Pb stress.

关键词： Soil Pb stress Succinic acid Larix olgensis Physiological response Pb uptake

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蓝相液晶对聚集诱导发光分子荧光性能的影响

液晶与显示 2024年第3期39卷 299-311页

作者：陈影段然许子言唐瑞琪童颖萍赵东宇北京航空航天大学化学学院北京100191

为了拓宽蓝相液晶的应用范围,构建多功能化蓝相体系平台,本文将具有聚集诱导发光(AIE)特性的液晶TPE-PPE引入蓝相液晶体系,围绕复合体系的荧光性能展开研究。一方面,系统研究并归纳了手性添加剂含量对蓝相液晶相转变行为和光子带隙位移... 详细信息

为了拓宽蓝相液晶的应用范围,构建多功能化蓝相体系平台,本文将具有聚集诱导发光(AIE)特性的液晶TPE-PPE引入蓝相液晶体系,围绕复合体系的荧光性能展开研究。一方面,系统研究并归纳了手性添加剂含量对蓝相液晶相转变行为和光子带隙位移情况的影响;另一方面,探究了蓝相液晶对AIE分子荧光性能的影响,提出了相关荧光增强效应的假说。实验结果表明,不同手性添加剂体系的蓝相Ⅱ的温域范围基本一致,且反射带隙随着温度的降低发生蓝移;而蓝相Ⅰ的温域与手性密切相关,体系中仅存在蓝相Ⅰ时,其反射带隙随温度的降低而红移。蓝相液晶体系对AIE分子有一定的荧光增强效应,并且在整个蓝相温域内,蓝相Ⅰ的反射带隙红移,体系的荧光强度明显增强。由此得出结论,TPE-PPE分子在一定程度上参与了蓝相液晶体系的自组装。由于TPE-PPE分子在双螺旋柱结构中的受限运动,导致其荧光强度增强。随着蓝相Ⅱ的消失和蓝相Ⅰ光子带隙的红移,更多TPE-PPE分子参与到双螺旋柱的自组装中,体系的荧光发射增强。

关键词：聚集诱导发光聚合物稳定蓝相液晶光子晶体