检索结果-南通市图书馆

维普期刊数据库博看期刊

不同水分条件下氨基酸添加对温带暗棕壤碳氮含量和甲烷排放的影响

在线全文

学校读者我要写书评

暂无评论

北京林业大学学报 2024年第5期46卷 103-113页

作者：李颖郭亚芬崔晓阳东北林业大学林学院黑龙江哈尔滨150040

【目的】解析土壤pH值与土壤氮以及CH_(4)排放速率与土壤碳氮含量间的相互关系,为明确碳氮转化及温室气体排放规律、优化温带森林暗棕壤的水分管理提供依据。【方法】以温带森林暗棕壤为研究对象,采用室内培养法,设置水分条件为土壤饱... 详细信息

【目的】解析土壤pH值与土壤氮以及CH_(4)排放速率与土壤碳氮含量间的相互关系,为明确碳氮转化及温室气体排放规律、优化温带森林暗棕壤的水分管理提供依据。【方法】以温带森林暗棕壤为研究对象,采用室内培养法,设置水分条件为土壤饱和持水量(WHC)的40%、60%、90%,通过向温带暗棕壤中添加两种不同性质的氨基酸,探讨其对土壤碳氮含量及CH_(4)排放的潜在影响,运用Pearson相关分析法分析土壤碳氮含量、pH值及CH_(4)排放速率间的相关性。【结果】(1)氨基酸处理显著增加了土壤可溶性有机碳(DOC)含量、铵态氮(NH_(4)^(+)-N)含量及CH_(4)排放速率。亮氨酸处理使DOC、NH_(4)^(+)-N含量分别升高21.39%、45.10%,CH_(4)排放速率较CK升高3.20倍,甲硫氨基酸使DOC、NH_(4)^(+)-N含量分别升高21.39%、72.71%,CH_(4)排放速率较CK升高7.00倍;(2)不同氨基酸对土壤硝态氮(NO_(3)^(-)-N)含量的影响存在差异。亮氨酸处理使土壤NO_(3)^(-)-N含量升高了8.41%,但其对于土壤硝化作用的影响可能存在滞后性,而甲硫氨基酸能够显著抑制土壤硝化作用,NO_(3)^(-)-N含量显著降低了37.90%;(3)土壤不同水分条件对土壤DOC、NH_(4)^(+)-N、NO_(3)^(-)-N含量及CH_(4)排放速率均存在显著影响。90%WHC使DOC含量升高11.95%~19.91%,使NH_(4)^(+)-N升高19.83%~35.46%,使NO_(3)^(-)-N降低10.05%~23.79%,使CH_(4)排放速率升高至另外两种水分条件的1.48~2.06倍。60%WHC条件使NH_(4)^(+)-N升高13.05%,使NO_(3)^(-)-N含量升高24.62%。60%WHC可能是温带暗棕壤硝化作用的最适含水量,90%WHC条件有利于DOC积累,同时对NO_(3)^(-)-N的产生存在明显抑制作用;(4)土壤pH与N H4+-N含量呈极显著正相关,与NO_(3)^(-)-N含量呈正相关。CH_(4)排放速率与NO_(3)^(-)-N含量呈极显著负相关,与NH_(4)^(+)-N含量呈负相关,与DOC含量呈极显著正相关。【结论】不同性质氨基酸添加在温带森林暗棕壤碳氮含量及CH_(4)排放中发挥的作用不尽相同。一定范围内,土壤水分含量的升高有利于土壤NH_(4)^(+)-N、NO_(3)^(-)-N、DOC的积累及CH_(4)的排放,但土壤高含水量条件对NO_(3)^(-)-N的产生具有抑制作用。因此,在研究温带森林暗棕壤碳含量、CH_(4)排放及氮转化机制时,建议关注不同氨基酸的差异性作用,同时考虑水分的变化。

关键词：土壤水分氨基酸态氮碳氮含量甲烷温带暗棕壤

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

在线全文

学校读者我要写书评

暂无评论

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

Recent advances in energy chemistry of precious-metal-free catalysts for oxygen electrocatalysis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2018年第12期29卷 1757-1767页

作者： Bin Wang xiaoyang cui Jiaqi Huang Rui Cao Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi'an 710119China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

The oxygen evolution reaction(OER) and oxygen reduction reaction(ORR) are coupled with various sustainable energy systems and are significant for the future energy scenario. Both of them suffer from sluggish kinetics, which calls for cost-effective and high-performance electrocatalysts to promote. The oxygen electrolysis of OER and ORR is heterogeneous reaction, which involves reactant and electron transfer, and a serial of complicate surface reactions. Both intrinsic catalyst activity and extrinsic physicochemical characters play a vital role in overall electrocatalytic reactivity. Herein. recent advances in rational design and effective construction of precious-metal-free materials are reviewed for OER and ORR, respectively, in the respects of electronic structure regulation, nanostructure tailor, and freestanding electrode fabrication. The reaction mechanism of OER and ORR are also updated. This review provides emerging energy chemistry concepts and materials chemistry strategies of electrocatalysts for OER and ORR, which is also enlightening for other energy conversion devices with targeted optimization.

关键词： Oxygen electrocatalysis Oxygen reduction reaction Oxygen evolution reaction Metal-air batteries Nanostructured electrocatalysts

Impact of H_(2)S on Hg^(0)capture performance over nitrogen-doped carbon microsphere sorbent:experimental and theoretical insights

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第3期18卷 89-100页

作者： Guopei Zhang xiaoyang Zhang Xiangwen Xing Xiangru Kong Lin cui Dong Yong National Engineering Laboratory for Reducing Emissions from Coal Combustion Shandong UniversityJinan250061China Bingtuan Energy Development Institute Shihezi UniversityShihezi832000China

A nitrogen-doped carbon microsphere sorbent with a hierarchical porous structure was synthesized via aggregation-hydrothermal *** Hg^(0)adsorption performance of the nitrogen-doped carbon microsphere sorbent was tested and compared with that of the coconut shell activated carbon prepared in the *** effect of H_(2)S on Hg^(0)adsorption was also *** nitrogen-doped carbon microsphere sorbent exhibited superior mercury removal performance compared with that of coconut shell activated *** the absence of H_(2)S at a low temperature(≤100℃),the Hg^(0)removal efficiency of the nitrogen-doped carbon microsphere sorbent exceeded 90%.This value is significantly higher than that of coconut shell activated carbon,which is approximately 45%.H_(2)S significantly enhanced the Hg^(0)removal performance of the nitrogen-doped carbon microsphere sorbent at higher temperatures(100–180℃).The hierarchical porous structure facilitated the diffusion and adsorption of H_(2)S and Hg^(0),while the nitrogen-containing active sites significantly improved the adsorption and dissociation capabilities of H_(2)S,contributing to the generation of more active sulfur species on the surface of the nitrogen-doped carbon microsphere *** formation of active sulfur species and HgS on the sorbent surface was further confirmed using X-ray photoelectron spectroscopy and Hg^(0)temperature-programmed desorption *** functional theory was employed to elucidate the adsorption and transformation of Hg^(0)on the sorbent surface.H_(2)S adsorbed and dissociated on the sorbent surface,generating active sulfur species that reacted with gaseous Hg^(0)to form HgS.

关键词： nitrogen-doped carbon microsphere H_(2)S Hg^(0)removal adsorption mechanism

火针联合机器人手套镜像疗法对脑卒中后手及上肢功能障碍影响

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

亚太传统医药 2024年第9期20卷 73-78页

作者：张伟黄文婷崔晓阳郑婵娟陈焱强湖北省中西医结合医院康复科

目的:观察火针联合机器人手套镜像疗法对脑卒中后手及上肢功能障碍的影响。方法:选取某院康复科收治的113例脑卒中患者，按随机数字表法分成观察组和对照组，其中脱落3例，实际纳入110例，均分为两组，每组55例。两组患者均接受常规康... 详细信息

目的:观察火针联合机器人手套镜像疗法对脑卒中后手及上肢功能障碍的影响。方法:选取某院康复科收治的113例脑卒中患者，按随机数字表法分成观察组和对照组，其中脱落3例，实际纳入110例，均分为两组，每组55例。两组患者均接受常规康复治疗，观察组在此基础上采用火针联合机器人手套镜像疗法，对照组采用机器人手套镜像疗法。治疗4周后，观察治疗前后等速肌力指标包括峰力矩(PT)、平均功率(AP)、最大总用功(TW);上肢表面肌电图均方根值(RMS)、肱二头肌协同收缩率(CR)、肱三头肌协同收缩率；简化手功能Fugl-Meyer评分量表(FMA);改良Barthel指数量表(MBI)的变化情况。结果:治疗前，两组患者PT、AP、TW、RMS、CR、FMA、MBI值比较差异均无统计学意义。治疗4周后，两组患者PT、AP、TW、FMA、MBI值较前升高(均P0.05)。结论:火针配合机器人手套镜像疗法能明显改善患者的手部及上肢运动功能，提高患者日常生活能力。

关键词：火针机器人手套镜像疗法脑卒中上肢运动功能手功能

Recent advances in spinel-type electrocatalysts for bifunctional oxygen reduction and oxygen evolution reactions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第2期30卷 290-302,I0010页

作者： Xiao-Meng Liu xiaoyang cui Kamran Dastafkan Hao-Fan Wang Cheng Tang Chuan Zhao Aibing Chen Chuanxin He Minghan Han Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School of Chemistry The University of New South WalesSydneyNSW 2052Australia AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory(ChEM-OIL) National Institute of Advanced Industrial Science and Technology(AIST)YoshidaSakyo-kuKyoto 606-8501Japan School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018HebeiChina Shenzhen Key Laboratory of Functional Polymer College of Chemistry and Chemical EngineeringShenzhen UniversityShenzhen 518061GuangdongChina

The demand for efficient and environmentally-benign electrocatalysts that help availably harness the renewable energy resources is growing rapidly. In recent years, increasing insights into the design of water electrolysers, fuel cells, and metal–air batteries emerge in response to the need for developing sustainable energy carriers, in which the oxygen evolution reaction and the oxygen reduction reaction play key roles. However, both reactions suffer from sluggish kinetics that restricts the reactivity. Therefore, it is vital to probe into the structure of the catalysts to exploit high-performance bifunctional oxygen electrocatalysts. Spinel-type catalysts are a class of materials with advantages of versatility, low toxicity, low expense, high abundance, flexible ion arrangement, and multivalence structure. In this review, we afford a basic overview of spinel-type materials and then introduce the relevant theoretical principles for electrocatalytic activity, following that we shed light on the structure–property relationship strategies for spinel-type catalysts including electronic structure, microstructure, phase and composition regulation,and coupling with electrically conductive supports. We elaborate the relationship between structure and property, in order to provide some insights into the design of spinel-type bifunctional oxygen electrocatalysts.

关键词： Spinel electrocatalyst Bifunctional energy electrocatalysis Oxygen evolution reaction Oxygen reduction reaction Structure–property relationship

A universal and ultrafast method for fabricating a library of nanocellulose-supported metal nanoparticles

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2024年第2期34卷 389-395页

作者： Ziyi Luo xiaoyang Wang Baihua cui Hao Luo Tao Zhang Jia Ding Yanan Chen Yida Deng Wenbin Hu School of Materials Science and Engineering Tianjin University Department of Chemistry National University of Singapore State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and Engineering Hainan University

Using nanocatalysts to catalyze water electrolysis for hydrogen production is an ideal solution to address the energy *** most well-adopted fabrication methods for nanocatalysts are tube furnace annealing,Hydrothermal method,etc.,hardly satisfying the trade-off among coarsening,dispersity,and particle size due to mutual ***,a universal,ultrafast and facile cellulose nanometer whiskers-high temperature shock（CNWHTS） method was reported for fabricating a library of ultrafine metal nanoparticles with uniform dispersion and narrow size *** metal-anchor functional groups in CNW（i.e.,-OH and-COOH） and the characteristics of the HTS method for ultrafast heating and powerful quenching synergistically contribute to the successful synthesis of metal *** an initial demonstration,the as-prepared Pt nanocatalyst(η10 mA cm-2=51.8 mV) shows more excellent catalytic hydrogen evolution reaction（HER） performance than the Pt catalyst prepared in the tubular furnace(η10 mA cm-2=169.4 mV).This rapid and universal CNW-HTS method can pave the way for nanomanufacturing to produce high-quality metal nanoparticles,thereby expanding applications of energy conversion and electrocatalysis.

关键词： Electrocatalysis High-temperature shock Hydrogen evolution reaction (HER) Nanocellulose Nanomanufacturing Nanoparticles

Effects of Different Forest Fire Intensities on Microbial Community Functional Diversity in Forest Soil in Daxing’anling

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Forestry Science and Technology 2012年第3期11卷 86-87页

作者： Zheng Qiong cui xiaoyang Di Xueying Jin Sen School of Forestry Northeast Forestry University

Microbial community functional diversity is a sensitive indicator of *** fires can change microbial community functional *** this research,the fired soil samples were collected from Huzhong of Daxing’anling in Heilongjiang Province. The functional diversity of soil microbial community was detected by BIOLOG *** average well color development(AWCD) in BIOLOG plates indicated the ability of carbon substrate utilization of microbial *** indices of Shannon, Simpson and Mcintosh were calculated to show the richness,dominance and evenness of the functional diversity,and the principal component analysis of substrate reactions reflected the main carbon sources utilized by microbial *** results showed that all the samples exhibited the reduction of AWCD during the first 144 hours of incubation,but there were obvious differences in the reduction degree among the *** kinds of fire intensities could influence microbial community functional diversity. The low fire intensity increased the richness (Shannon),dominance(Simpson) and evenness (Mcintosh) of microbial ***,the intermediate and high fire intensity reduced these parameters,suggesting that the burned soil emitted gaseous nitrogen,a number of organic carbon and available phosphorus,which caused the reduction of the microorganism in quantity and type,and change in soil *** organic material reduced in the burned soil,in the same time,the pH values rose,which changed environment in which microorganism *** changed environment might not be conducive to activities of the *** principal component analysis showed that the main carbon sources for soil microbes were carbohydrates and amino acids and the carbon substrate utilization patterns in different samples were significant *** results indicated that functional diversity of soil microbes were altered by forest fires,and the ability of microbes to utilize carbon source and th

关键词： forest fire forest fire intensity microbial community functional diversity BIOLOG

scEpiTools: a database to comprehensively interrogate analytic tools for single-cell epigenomic data

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2024年第4期51卷 462-465页

作者： Zijing Gao xiaoyang Chen Zhen Li Xuejian cui Qun Jiang Keyi Li Shengquan Chen Rui Jiang Ministry of Education Key Laboratory of Bioinformatics Bioinformatics Division at the Beijing National Research Center for Information Science and TechnologyCenter for Synthetic and Systems BiologyDepartment of AutomationTsinghua UniversityBeijing 100084China School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071China

Recent advances in single-cell sequencing technologies provide significant implications for understanding cellular heterogeneity,developmental biology,and disease *** fully exploit the potential of these data,numerous tools have been proposed for upstream and downstream *** the the single-cell RNA sequencing(scRNA-seq)community,scRNA-tools(Zappia et al.,2018)was proposed to help researchers navigate the plethora of tools by *** its inception,scRNA-tools has been widely used and its updated version further reveals trends in the field with over 1000 collected tools(Zappia and Theis,2021),providing a valuable guidance in selecting tools for analyses.

关键词： analytic selecting Tools