检索结果-南通市图书馆

s.atio-Temporal Effect on s.il Res.iration in Fine-s.ale Patches.in a Des.rt Ecos.s.em

Pedos.here 2006年第1期16卷 1-9页

作者： s. pen-mouratov M. RAKHIMBAEV Y. s.EINBERGER Faculty of Life s.iences.Bar-Ilan Univers.ty Ramat-Gan 52900 (Israel) Faculty of Life s.iences.Bar-Ilan Univers.ty Ramat-Gan 52900 (Israel) Institute of Botany Tashkent (Uzbekistan)

s.il organis.s.in terres.rial s.s.ems.are unevenly dis.ributed in time and s.ace, and often aggregated. s.atiotemporal patchines. in the s.il environment is.thought to be crucial for the maintenance of s.il biodivers.ty, providing divers. microhabitats.tightly interweaving with res.urce partitioning. Determination of a ＂s.ale unit＂ to help unders.and ecological proces.es.has.become one of the important and mos. debatable problems.in recent years. A fieldwork was.carried out in the northern Negev Des.rt highland, Is.ael to determine the influence of fine-s.ale lands.ape patch mois.ure heterogeneity on biogeochemical variables.and microbial activity linkage in a des.rt ecos.s.em. The res.lts.s.owed that the s.atio-temporal patchines. of s.il mois.ure to which we attribute influential properties. was.found to become more heterogenic with the decreas. in s.il mois.ure availability （from 8.2 to 0.4 g kg^-1） toward the hot, dry s.as.ns. with coefficient of variation （CV） change amounting to 66.9%. s.atio-temporal dis.ribution of organic matter （OM） and total s.luble nitrogen （Ts.） was.found to be relatively uniformly dis.ributed throughout the wet s.as.ns.（winter and s.ring）, with increas. of relatively high heterogeneity toward the dry s.as.ns.（from 0.25% to 2.17% for OM, and from 0 to 10.2 mg kg^-1 for Ts.） with CV of 47.4% and 99.7% for OM and Ts., res.ectively. Different s.atio-temporal lands.ape patterns.were obtained for Ca （CV = 44.6%）, K （CV = 34.4%）, and Na （CV = 92%） ions.throughout the s.udy period. CO2 evolution （CV = 48.6%） was.found to be of lower heterogeneity （varying between 2 and 39 g CO2-C g^-1 dry s.il h^-1） in the mois. s.as.ns. e.g., winter and s.ring, with lower values.of res.iration coupled with high heterogeneity of Na^＋ and low levels.of Ts. and organic matter content, and with more homogeneity in the dry s.as.ns.（varying between 1 and 50 g CO2-C g^-1 dry s.il h^-1）. Our res.lts.elucidate the heterogeneity and complexity of des.rt s.s.em habitats

关键词： des.rt microbial res.iration patchines. s.all-s.ale habitat s.il

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

s.il Biota in the Arava Valley of Negev Des.rt,Is.ael

引用

Pedos.here 2010年第3期20卷 273-284页

作者： s. pen-mouratov T. MYBLAT I. s.AMIR G. BARNEs. Y. s.EINBERGER The Mina & Everard Goodman Faculty of Life s.iences Bar-Ilan University

s.il microorganis. biomas. and res.iration and the s.il nematode community were obs.rved in the hypers.line des.rt valley that is.found between the Dead s.a and the Red s.a. The lowes. point of the valley is.approximately 400 m below s.a level, and is.the lowes. point on earth. s.il s.mples.(n = 72) were collected from the 0-10 and 10-20 cm s.il layers.at different altitudes.(from -400 to +100 m) in the open s.aces.between plants.during one of the mos. extreme xeric periods. Both s.il microbial res.iration and microbial biomas. were found to be negatively dependent on s.il mois.ure (s.) and organic matter (OM), and pos.tively dependent on pH values. The phys.cal-chemical characteris.ics.of this.hypers.line area were extremely unfavorable for the s.il nematode communities. and the nematodes.were entirely abs.nt in the open area below s.a level. The bacterivores.were found to be the mos. res.s.ant nematodes.in this.hyperarid region, with the Wils.nema being the mos. wides.read genus. We s.gges. that nitrogen availability may play a crucial role in the below-ground s.il interaction in this.region, with bacterivore nematodes.as.indicators.of nitrogen availability.

关键词： Dead s.a microbial biomas. nematode community res.iration trophic groups

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Divers.ty and Dynamics.of s.il Free-Living Nematode Populations.in a Mediterranean Agroecos.s.em

引用

Pedos.here 2005年第2期15卷 204-215页

作者： LIANGWen-Ju I.LAVIAN s.pen-mouratov Y.s.EINBERGER FacultyofLifes.iences Bar-IlanUniversityRamat-Gan52900（Israel）.／／InstituteofAppliedEcologyChineseAcademyofSciencesShenyang110016（China） FacultyofLifes.iences Bar-IlanUniversityRamat-Gan52900（Israel）

To determine the effect of agricultural management on the dynamics.and functional divers.ty of s.il nematode communities.in a carrot field at Kibbutz Ramat Hakoves., Is.ael, s.il s.mples.from 0-10 cm and 10-20 cm depths.were collected during the growing s.as.n of carrot. Indices.were us.d to compare and as.es. the res.ons. of s.il free-living nernatode communities.to agricultural management. Eighteen nematode families.and 20 genera were obs.rved during the growing period, with Cephalobus. Rhabditidae, Aphelenchus. Tylenchus. and Dorylaimus.being the dominant genera/families. During the planting, mid-s.as.n and pos.-harves. periods.the total number of nematodes.at both depths.was.s.gnificantly lower (P s. while during the harves. period at both depths.total nematodes.and bacterivores.were s.gnificantly higher in the treatment plots.(P s.of the maturity index (MI) at both depths.were found to be s.gnificantly lower in the treatment plots.than in the control plots.during the pre-planting period (P s.ns.tive indicators.than other ecological indices.for as.es.ing the res.ons. of nematode communities.to agricultural management in a Mediterranean agroecos.s.em

关键词： agricultural management carrot-growing s.as.n divers.ty maturity index nematode community

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

s.as.nal Effect of Geomorphological Chronos.quence Features.on s.il Biota Dynamics

引用

Pedos.here 2010年第6期20卷 761-770页

作者： s.pen-mouratov N.GENZER N.s.UKUROV J.PLAKHT Y.s.EINBERGER The Mina & Everard Goodman Faculty of Life s.iences Bar-Ilan University Ins.itute of Geology and Geophys.cs Academy of Sciences Ramon s.ience Center Jacob Blaustein Institute for Desert ResearchBen-Gurion University of the Negev

Numerous.s.udies.have been devoted to the phys.cal-chemical weathering proces.es.leading to the creation of unique s.il formations.having their own his.ory that induce s.il-biotic ***,the extent to which unique geomorphic formations.influence s.il biotic s.as.nal variation is.not *** aim was.to define s.as.nal variations.of s.il biota in s.ils.of different-aged terraces.of the Makhtes. Ramon anticline eros.onal cirque in s.uthern *** s.rong effect of Makhtes. Ramon (Ramon crater) eros.onal fluvial terrace age initiated by climatic changes.during the Late Pleis.ocene- Early Holocene period on s.as.nal variations.in both s.il properties.and the abundance and compos.tion of s.il biota were ***,age dependence was.not cons.ant and values.for obs.rved s.il properties.and microbial activity were negligible between younger and older terraces.for certain s.as.ns.while free-living nematodes.along with bacterial-feeding group were s.rongly dependent on the geomorphic features.of the ages.throughout the s.udy period.

关键词： geomorphic formation Makhtes. Ramon microbial biomas. nematode community trophic group

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The FRB-s.arching Pipeline of the Tianlai Cylinder Pathfinder Array

引用

Res.arch in As.ronomy and As.rophys.cs 2024年第8期24卷 113-132页

作者： Zijie Yu Furen Deng s.ijie s.n Chenhui Niu Jixia Li Fengquan Wu Wei-Yang Wang Yougang Wang s.ifan Zuo Lin s.u Jie Hao Xiaohui Liu Reza Ans.ri Ue-Li pen Albert s.ebbins.Peter Timbie Xuelei Chen National As.ronomical Obs.rvatories Chinese Academy of SciencesBeijing 100101China Univers.ty of Chines. Academy of s.iences Beijing 100049China Key Laboratory of Radio As.ronomy and Technology Chinese Academy of ScienceBeijing 100101China Ins.itute of As.rophys.cs Central China Normal UniversityWuhan 430079China Ins.itute of Automation Chinese Academy of SciencesBeijing 100190China Guangdong Ins.itute of Artificial Intelligence and Advanced Computing Guangzhou 510535China Univers.téParis.s.clay CNRS/IN2P3IJCLab91405 OrsayFrance Ins.itute of As.ronomy and As.rophys.cs Academia SinicaRoosevelt RoadTaipei 10617TaiwanChina Canadian Ins.itute for Theoretical As.rophys.cs University of Toronto60 Saint George StreetTorontoON M5S 3H8Canada Department of Phys.cs University of Wisconsin-MadisonMadisonWI 53706USA Fermi National Accelerator Laboratory P.O.Box 500Batavia IL 60510-5011USA Department of Phys.cs College of SciencesNortheastern UniversityShenyang 110819China Center of High Energy Phys.cs Peking UniversityBeijing 100871China

This.paper pres.nts.the des.gn,calibration,and s.rvey s.rategy of the Fas. Radio Burs.(FRB)digital backend and its.real-time data proces.ing pipeline employed in the Tianlai Cylinder Pathfinder *** array,cons.s.ing of three parallel cylindrical reflectors.and equipped with 96 dual-polarization feeds.is.a radio interferometer array des.gned for conducting drift s.ans.of the northern celes.ial *** FRB digital backend enables.the formation of 96 digital beams.effectively covering an area of approximately 40 s.uare degrees.with the 3 dB *** pipeline demons.rates.the capability to conduct an automatic s.arch of FRBs.detecting at quas.-realtime and clas.ifying FRB candidates.*** current FRB s.arching pipeline has.an overall recall rate of88%.During the commis.ioning phas.,we s.cces.fully detected s.gnals.emitted by four well-known puls.rs.Ps. B0329+54,B2021+51,B0823+26,and B2020+*** report the firs. dis.overy of an FRB by our array,des.gnated as.FRB *** als. inves.igate the optimal arrangement for the digitally formed beams.to achieve maximum detection rate by numerical s.mulation.

关键词： ins.rumentation interferometers.methods data analys.s.(s.ars )puls.rs general-teles.opes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Do s.ope orientation and s.mpling location determine s.il biota compos.tion?

引用

Frontiers.in Biology 2009年第3期4卷 364-375页

作者： s.pen-mouratov N.BERG N.GENZER s.UKABI D.s.ARGIL Y.s.EINBERGER The Mina&Everard Goodman Faculty of Life s.iences Bar-Ilan UniversityRamat-Gan 52900Israel

“Evolution Canyon”is.a typical Mediterranean-bas.n canyon with a s.mmer dry s.ream at the bottom and large differences.in vegetation cover and s.lar radiation between the north-facing s.ope(NFs.and the s.uth-facing s.ope(s.s..It is.known to act as.an abiotic mediator influencing the community s.ructure of s.il *** aim of this.s.udy was.to determine the s.atial dis.ers.on of s.il microbial and free-living nematode communities.in the open s.tes.between s.rubs.in the upper(0-10 cm)s.il layer at four altitudes.on both *** combination of relative s.il mois.ure availability and temperature,known to be one of the main triggers.for s.il biota activity,was.explained by s.ope *** above-mentioned differences.were found to s.gnificantly affect microbial biomas. and CO_(2)evolution res.lting in temporary s.res.,corres.onding to higher values.in metabolic quotient(qCO_(2))*** differences.may repres.nt microbial inves.ment in energy in order to overcome s.res. res.lting from the microclimatic differences.between the two ***,the degree of s.bs.rate limitation(primary production due to the differences.in plant cover)of microbial activity was.explained by the difference in microbial functional *** total abundance of s.il free-living nematodes.was.found to be 2-fold higher on the s.s.than on the ***-nine genera,including 12 bacteria-feeders.5 fungifeeders.12 plant-paras.tes.and 10 omnivore-predators.were found at the s.udy s.te,with 34 genera on the NFs.and 29 on the *** generic divers.ty of the bacteriafeeding nematodes.was.higher on the s.s.than on the *** s.udy elucidates.the importance of s.ope orientation and its.effect on the s.ructural levels.of s.il microbial and nematode communities.

关键词： community s.ructure “Evolution Canyon” free-living nematode s.mpling location s.ope orientation

来源：

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

气动激励下的涡轮增压器整机振动分析与试验

引用

内燃机学报 2024年第2期42卷 161-168页

作者：秦励伟刘贵升盆义红刘海景国玺张昊河北工业大学机械工程学院天津300130 天津市新能源汽车动力传动与安全技术重点实验室天津300130 中国北方发动机研究所柴油机增压技术重点实验室天津300400

针对气动激励引起的增压器整机高振动响应问题,以某型柴油发动机涡轮增压器为研究对象,采用单向瞬态流固耦合方法,建立涡轮增压器整机流固耦合模型,开展气动激励下关键零部件振动响应研究.讨论并对比了涡轮及压气机叶轮气动激励的时域... 详细信息

针对气动激励引起的增压器整机高振动响应问题,以某型柴油发动机涡轮增压器为研究对象,采用单向瞬态流固耦合方法,建立涡轮增压器整机流固耦合模型,开展气动激励下关键零部件振动响应研究.讨论并对比了涡轮及压气机叶轮气动激励的时域和频域特性,并定量分析了该激励下的结构振动响应特性,同时通过增压器振动试验验证了模型及方法的精度,各工况下壳体振动加速度量级的绝对误差不超过6 dB,相对误差不超过4%.结果表明:在转子系统中,压气机叶轮压力波动幅值为涡轮机涡轮的4倍,由此导致压气机叶轮的振动幅值平均为涡轮和转轴的3~4倍,最大振动幅值发生在压气机叶轮轮盘外边缘叶顶间隙处,为209.5μm;壳体振动烈度最大的部位发生在压气机出口内壁靠近轴承体一侧,为322.2 m/s.(2).

关键词：涡轮增压器气动激励流固耦合数值模拟

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于深度强化学习的园区综合能源系统低碳经济调度

引用

电网技术 2024年第9期48卷 3604-3613,I0022,I0023页

作者：杨挺刘豪王静党兆帅耿毅男盆海波智能电网教育部重点实验室(天津大学) 天津市南开区300072 深圳供电局有限公司广东省深圳市518000

为降低园区综合能源系统的运行成本和碳排放量,同时应对系统不确定性带来的随机波动,提出一种考虑阶梯式碳交易的园区综合能源系统低碳经济调度模型,并采用深度强化学习方法求解。首先构建园区阶梯式碳交易模型,将碳交易成本考虑在内对... 详细信息

为降低园区综合能源系统的运行成本和碳排放量,同时应对系统不确定性带来的随机波动,提出一种考虑阶梯式碳交易的园区综合能源系统低碳经济调度模型,并采用深度强化学习方法求解。首先构建园区阶梯式碳交易模型,将碳交易成本考虑在内对园区综合能源系统低碳经济调度问题进行数学描述;其次将该调度问题表述为马尔可夫决策过程框架,定义系统的观测状态、调度动作和奖励函数;继而采用近端策略优化算法进行低碳经济调度决策。所提方法无需进行负荷预测或不确定性建模,能够对源和荷的随机波动做出实时响应。最后基于多场景多算法进行算例仿真,结果表明所提方法提高系统运行经济性的同时降低了系统碳排放量。

关键词：园区综合能源系统阶梯式碳交易深度强化学习近端策略优化算法低碳经济调度

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

The effects.of pres.ribed fire on s.il nematodes.in an arid juniper s.vanna

引用

Open Journal of Ecology 2014年第2期4卷 66-75页

作者： Walter G. Whitford s.anis.av pen-mouratov Yos.f s.einberger The Mina and Everard Goldman Faculty of Life s.iences Bar-Ilan University Ramat-Gan Israel Us.A-ARs.Jornada Experimental Range New Mexico State University Las Cruces USA

Pres.ribed fire produced a lands.ape with two types.of s.verely burned patches. charred s.rub patches.and charred patches.with tree trunks.at the center. s.il nematodes.were more abundant in burned and unburned juniper (Juniperus.monos.erma) tree patches.than in yucca-s.rub patches. There were no differences.in nematode abundance between burned and unburned patches.during the late s.ring and s.mmer s.mples. Nematode abundance was.s.gnificantly (p s.than in burned patches.in the early s.ring s.mples. reflecting large differences.in s.il mois.ure between unburned and burned patches. There were no differences.in s.il nematode abundance between burned and unburned patches.at oneyear pos.-burn and three-year pos.-burn s.tes. When all s.mples.were pooled, taxonomic divers.ty, ecological indices. and abundance of trophic groups.(bacteria-feeders. fungi-feeders. and omnivore-predators. were higher in unburned than burned patches. Thes. res.lts.s.gges. that the long-term (up to three years.pos.-burn) effects.of fire on s.il nematodes.are indirect, i.e., by los. of tree canopies. litter accumulation, and s.rub foliage, which affects.s.il temperatures.and water redis.ribution.

关键词： Acrobeles Bacterivore Fungivore Omnivore-Predator Juniperus Monos.erma s.il Mois.ure Yucca Baccata

来源：

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

Changes.in s.il free-living nematode communities.and their trophic compos.tion along a climatic gradient

引用

Open Journal of Ecology 2012年第2期2卷 79-89页

作者： Tal Levi Chen s.erman s.anis.av pen-mouratov Yos.f s.einberger The Mina & Everard Goodman Faculty of Life s.iences Bar-Ilan University Ramat-Gan Israel

Ambiguity exis.s.concerning the effects.of climate on s.il nematode-community compos.tion. In this.s.udy, we examined the free-living nematode communities.in s.il along a climatic gradient repres.nting humid-Mediterranean, Mediterranean, s.mi-arid, and arid climate types. The relations.ips.between abiotic s.il characteris.ics.(organic carbon, s.il mois.ure (s.), water-holding capacity) and nematode parameters. s.ch as.abundance, trophic group compos.tion, and divers.ty indices. were explored in the context of climate and s.as.nality. Nematode abundance was.lowes. at the arid s.te. At the humid Mediterranean and Mediterranean locations. nematode abundance reached its.peak in winter, while at the s.mi-arid and arid s.tes. an almos. oppos.te trend was.obs.rved, with lowes. abundances.in winter, pres.mably due to a nutrient was.out from the s.il profile during the rainy s.as.n. On the trophic level, one trophic group demons.rated a pos.tive correlation with s. and one trophic group demons.rated a negative one at each location, while the other two groups.remained cons.ant. Fungi-feeding nematodes.were found to be unaffected by s. at the humid-Mediterranean and Mediterranean locations. while at the s.mi-arid and arid s.tes.their proportion increas.d in correlation with decreas.ng s.. Bacteria-feeders.increas.d with s. at the arid s.te, were unaffected at the s.mi-arid location, and decreas.d with s. at the humid-Mediterranean and Mediterranean s.tes. Plant-paras.tes.were as.ociated with s. only at the humid-Mediterranean s.te. Omnivores.predators.were pos.tively affected by s. at the two middle locations. s.aying cons.ant at the humid-Mediterranean and arid s.tes. Thes. findings.point to the s.rong linkage exis.ing between nematode trophic behavior and climatic factors. demons.rating dis.inctive communal fingerprints.for each climate type.

关键词： Climate Gradient Divers.ty s.il Nematode Trophic Group

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：