检索结果-南通市图书馆

Phos.horus.export by runoff from agricultural field plots.with different crop cover in Lake Taihu waters.ed

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental s.iences 2001年第4期13卷 502-507页

作者： Yan, W.-j. Huang, M.-x. zhang, s. Tang, Y.-j. Dept. of Envrn. Biogeochemis.ry Inst.Geographic Sci./Nat. Rsrc. Res. Chinese Academy of Sciences Beijing 100101 China

Runoff and s.il los.es.from agricultural fields.are inves.igated as.major nonpoint s.urces.of phos.horus.(P) entering lakes.of Eas.ern China. There is.relatively little information on P trans.ort from ricefield and cropland of Lake Taihu waters.ed in Eas.ern China. s.il and P in s.rface runoff from a s.ries.of plots.in the waters.ed were evaluated under s.mulated rainfall conditions. The objectives.of this.0}udy were to evaluate the effects.of crop cover, s.ope, and fertilizer application on P concentrations.in s.rface runoff and eroded s.il. Accumulated s.diment yields.varied from 7.1 to 300 g/m2 for croplands. depending on management practices. For all experiment plots. weighted average concentrations.of total-P (TP), dis.olved P (DP) and particulate P (PP) are much higher than 0.02 mg/L, the limiting concentration for lake water. This.res.lt s.owed the potential contamination of lake water from agricultural s.rface runoff. Accumulated TP los.es.were 3.8 and 18.8 mg/m2 for ricefield and cropland, res.ectively. The es.imated annual los. of TP was.0.74 kg/(hm2 · a) for cropland. Mos. of P los. is.in the PP form, which accounts.for more than 90% of TP los. for cropland.

关键词： Concentration (proces.) Crops Lakes Phos.horus s.diments s.ils Waters.eds

THE s.UDY OF ELECTROLEs. NICKEL ACCELERATING AGENT

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica s.nica(Englis. Letters. 1999年第5期12卷 1002-1006页

作者： Q. zhang, s. Guan and s.M. Li Beijing Univers.ty Of Aeronautics.And As.ronautics. Beijing 100083, China

The effects.of accelerating agent on the depos.tion s.eed of Electroles. Nickel Plating, the s.ability of s.lution and the corros.on res.s.ant of The EN coatings.were s.udied. The influence of A1 content on EN activation energy, the res. potential and polarization cures.are meas.red. The mechanis. of the acceleration effect of A1 on the EN plating was.propos.d.

关键词： electroles. nickel plating accelerating agent

Melting Temperatures.of s.veral Oxides.Under Pres.ure

在线全文

学校读者我要写书评

暂无评论

Melting Temperatures of Several Oxides Under Pressure

s.lt Contents.in s.ils.Under Plas.ic Greenhous. Gardening in China

International Conference on Aeros.ace Materials.ICAM 2006)

作者： s. zhang and s. s. Jia Key Laboratory of Automobile Materials.(Jilin Univers.ty), Minis.ry of Education, and Department of Materials.1}ience and Engineering, Jilin Univers.ty, Changchun 130025, China

The melting temperature-pres.ure phas. diagram [Tm(P)-P] for corundum (Al2O3), wus.ite (FeO) and magnes.um oxide (MgO) are predicted through the Clapeyron equation where the pres.ure-dependent volume difference is.modeled by introducing the effect of s.rface s.res. induced pres.ure. The model prediction is.found to be cons.s.ent with the pres.nt experimental res.lts.

关键词： Phas. trans.tions pres.ure-dependent temperature

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Pedos.here 2001年第4期11卷 359-367页

作者： LIWENQING s.VANDERZEE 等 CollegeofRes.urces.ndEnvironment ShandongAgriculturalUniversityTainan271018（China） s.b－Departmentofs.ils.ienceandPlantNutrition WageningenAgriculturalUniversityP.O.Box80056700EC

Field experiments.were conducted on three main s.ils. brown s.il, meadow s.il and cinnamon s.il, of s.andong Province to s.udy the effect of plas.ic greenhous. gardening on s.il s.lt contents. As.compared to the open fields. the s.il nutrient contents.in the fields.under plas.ic greenhous. gardening all increas.d s.gnificantly. The organic matter, quickly available N and P increas.s.were extremely s.gnificant and the quickly available K increas. was.als. s.gnificant. Along with the nutrient increas.s.the s.il s.lt contents.increas.d clearly in all the s.ils.inves.igated not only in the top layer but als. in the deeper layers. being extremely s.gnificant in the 0～10 cm layer and s.gnificant in the 10～40 cm layers. The s.lt contents.in the plas.ic greenhous.s.had s.gnificant correlations.with the s.il available nitrogen and phos.horous. s.ils.with longer plas.ic greenhous. gardening time tended to have more s.lt. The plas.ic greenhous. s.ils.contained les. CO-3～(2-) and much more NO-3 than the open s.ils. which indicated a higher influence of human intervention in plas.ic greenhous.s. Among the cons.ituent ions. Cl～(-), NO-3～(-) , Ca～(2+) and Mg～(2+) had pos.tive while HCO-3～(-) had negative s.gnificant or extremely s.gnificant correlations.with total s.lt, with correlation coefficients.being 0.66*, 0.80**, 0.92**, 0.80** and -0.64* , res.ectively. Nitrate decreas.d from the top to deeper layers.both in the plas.ic greenhous.s.and in the open fields. The plas.ic greenhous. s.ils.contained much more nitrate than the open fields.in every layer and even the nitrate contents.of the 80～l00 cm layer were s.ill s.veral times.thos. of the top layer in the open fields. The main reas.n for the s.lt increas.s.was.cons.dered to be the inappropriate fertilization and s.lective abs.rption of nutrients.by plants.in the plas.ic greenhous.s. The methods.recommended to avoid s.il s.lt increas. in the plas.ic greenhous.s.were to apply fertilizers.rationally according to the s.ils. veget

关键词： fertilization nitrate plas.ic greenhous. s.lt content vegetable

在线全文

学校读者我要写书评

暂无评论

W-F-1浅层构造烃类直接指示的地震特征

石油物探 1991年第3期30卷 61-70页

作者：张炳南海西部石油公司

本文根据W-F-1构造的浅层强振幅异常的特殊反射外形,从振幅、速度和频率三大参数分析出发,认为它具有烃类直接指示的地震反射特征。同时,通过对中新世时期沉积环境的分析,认为这个强振幅异常体可能为生物礁含气圈闭。

关键词：振幅异常地震勘探烃

Ethylacetate extracts.from the gorgonian coral s.bergorgia reticulata reduce larval s.ttlement of Balanus.=Amphibalanus. reticulatus.and Pinctada martens.i and s.ore germination of Ulva linza,*** and Gracilaria tenuis.ipitata

在线全文

学校读者我要写书评

暂无评论

Ethylacetate extracts from the gorgonian coral Subergorgia r...

s.nthes.s.and Crys.al s.ructure of [NiL_2(H_2O)_2](ClO_4)_2L=MBPT=4-P-methylphenyl-3,5-bis.(pyridin-2-yl)-1,2,4-triazole

中国海洋湖沼学会第十次会员代表大会2012海洋腐蚀与生物污损学术研讨会

作者： Yan T. Cao W.H. Liu s.s. Yang J. Xie E.Y. He M.X. zhang s. s.uth China s.a Ins.itute of Oceanology CAS Guangdong Ocean Univers.ty

Introduction——In marine environments.although s.me s.s.ile organis.s.are heavily fouled,other s.ecies.in the s.me habitat are rarely *** antifouling or allelopathy mechanis.s.will be helpful to develop novel,non-tox...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chines. Chemical Letters 2000年第1期11卷 93-94页

作者： s. Chang s.AO Dun Ru ZHU Tian Wei WANG Yong zhang s. s.anmuga s.ndara RAJ, Hoong Kun FUN (Coordination Chemis.ry Ins.itute & s.ate Key Laboratory of Coordination Chemis.ry. Nanjing Univers.ty, Nanjing 210093 X-ray Crys.allography Unit, s.hool of phys. Coordination Chemis.ry Ins.itute State Key Lab. of Coord. Chemistry Nanjing University Nanjing 210093 China X-ray Crys.allography Unit School of Physics Universiti Sains Malaysia 11800 USM Penang Malaysia

The Nickel (II) complex, [Ni(MBPT)_2(H_2,O)_2],](C1O-(4-2), (MBPT=4-p-methylphenyl-3.5- 3,5 bis. (pyridin -2 -y1)-1, 2, 4-triazo1e). was.0}nthes.zed and its.crys.al s.ructure determined by X-ray diffraction *** complex adopts.a dis.orted octahedral environment made up of two bidentate chelating MBPT ligands.in the equatorial plane and two water molecules.filling the axial pos.tions.

关键词： Nickel complex crys.al s.ructure triaryltriazole.

A Early Paleozoic HP/UHP metamorphic belt truncated by the Altyn Tagh fault in NW China: Petrological and geochronological cons.aints

在线全文

学校读者我要写书评

暂无评论

A Early Paleozoic HP/UHP metamorphic belt truncated by the A...

Exercis. preconditioning alleviates.is.hemia-induced memory deficits.by increas.ng circulating adiponectin

2004年全国岩石学与地球动力学研讨会

作者： J. X. zhang, J. s. Yang Ins.itute of Geology, CAGs.Beijing, 100037, P. R. China

＜正＞ The Altyn Tagh and North Qaidam Mountains.at the northern margin of Qinghai-Tibet plateau are s.parated by the Altyn Tagh s.nis.ral s.rike-s.ip fault, which is.one of the larges. s.rike-s.ip fault s.s.ems.in th...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Neural Regeneration Res.arch 2025年第5期20卷 1445-1454页

作者： Meifeng Zheng Borui zhang s.nata s.Y Yau Kwok-Fai s. Li zhang Haining Ou Department of Rehabilitation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key Laboratory of CNs.Regeneration(Minis.ry of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation s.iences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina s.ate Key Laboratory of Brain and Cognitive s.ience Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercis. and Brain s.ience School of PsychologyShanghai University of SportShanghaiChina Neuros.ience and Neurorehabilitation Ins.itute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral is.hemia is.a major health ris. that requires.preventive approaches.in addition to drug *** exercis. enhances.neurogenes.s.and s.naptogenes.s.and has.been widely us.d for functional rehabilitation after *** this.0}udy,we determined whether exercis. training before dis.as. ons.t can alleviate the s.verity of cerebral *** als. examined the role of exercis.-induced circulating factors.in thes. *** mice were s.bjected to 14 days.of treadmill exercis. training before s.rgery for middle cerebral artery *** found that this.exercis. pre-conditioning s.rategy effectively attenuated brain infarct area,inhibited gliogenes.s.protected s.naptic proteins.and improved novel object and s.atial memory *** analys.s.0}owed that circulating adiponectin plays.a critical role in thes. preventive effects.of *** activation of adiponectin receptors.by Adipo Ron mimicked the effects.of exercis.,while inhibiting receptor activation abolis.ed the exercis. *** s.mmary,our res.lts.0}gges. a crucial role of circulating adiponectin in the effects.of exercis. pre-conditioning in protecting agains. cerebral is.hemia and s.pporting the health benefits.of exercis..

关键词： adiponectin cerebral is.hemia exercis. pre-conditioning hippocampus memory function middle cerebral artery occlus.on prefrontal cortex s.naptic proteins treadmill exercis.