检索结果-南通市图书馆

Temperature Effect Investigation toward Peat Surface CO2 Emissions by Planting Leguminous Cover Crops in Oil Palm Plantations in West Kalimantan

引用

Journal of Agricultural Science and Technology(B) 2015年第3期5卷 170-183页

作者： Arifin Suntoro Wongso Atmojo Prabang Setyono Widyatmani sih Dewi Environmental Engineering Department Tanjungpura University Pontianak 78124 Indonesia Agriculture Faculty Sebelas Maret University Surakarta 57126 Indonesia Environmental Science Postgraduate Program Sebelas Maret University Surakarta 5 7126 Indonesia Agriculture Postgraduate Program Sebelas Maret University Surakarta 5 7126 Indonesia

The aim of this research was to know the impact of planting leguminous cover crops （LCCs） of mucuna bracteata and Calopogonium mucunoides in oil palm plantation on peatland on reducing CO2 emissions. Atmosphere temperature, peat surface temperature, in-closed chamber temperature and peat surface CO2 fluxes were monitored on two adjacent experimental plots. The first experimental plot was on the newly opened peat surface （NOPS） and another was on the eight years planted oil palm land （EPOL）. The closed chamber techniques adopted from International Atomic Energy Agency （IAEA）（1993） were implemented to trap CO2 emissions emitted from 24 treatment plots at the 1st, 3rd and 6th months observations. Average CO2 fluxes observed on no LCCs plots in the NOPS site were 61.25 ± 8.98, 33.76 ± 2.92 and 33.75 ± 3.45 g/m2.h, while in the EPOL site were 55.38 ± 15.95, 29.90 ± 5.32 and 27.70 ± 4.62 g/mLh at the 1st, 3rd and 6th months monitoring, respectively. Average CO2 fluxes observed on the planted m. bracteata plots in the NOPS site were 68.2 ± 24.5, 12.88 ± 3.70 and 10.40 ± 1.28 g/m2.h, whereas in the EPOL site were 54.04 ± 6.70, 11.45 ± 2.00 and 9.33 ± 3.49 g/m2.h at the 1st, 3rd and 6th months monitoring, respectively. Average CO2 flux observed on the planted C. mucunoides plots in the NOPS site were 66.5 ± 23.7, 15.41 ± 1.51 and 9.74 ± 2.55 g/m2.h, while in the EPOL site were 47.00 ± 5.00, 9.34 ± 1.23 and 10.52 ± 4.80 g/m2.h at the 1st, 3rd and 6th months, respectively. P-value for the experimental sites was 0.008 （〈 0.05）, indicating the significant difference in the level of CO2 fluxes between the sites. P-value for the treatments in the experimental plots was 0.000 （〈 0.05）, indicating markedly different level of CO2 fluxes among treatments. P-value for the age ofm. bracteata and C. mucunoides planted on the experimental plots was 0.000 （〈 0.05）, indicating the significant difference in the level of CO2 fluxes due to the enhanced LCCs age performing at the increase of s

关键词： Temperature peat surface CO2 emissions mucuna bracteata Calopogonium mucunoides.

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

Experimental Determination and modeling of Bubble Size Distributions in Bubble Columns

引用

Chinese Journal of Chemical Engineering 1998年第1期6卷 33-45页

作者： h.F.Svendsen 罗和安 K.W.hjarbo h.A.Jakobsen Department of Chemical Engineering Norwegian University of Science and Technology Department of Chemical Engineering Xiangtan University SINTEF Applied Chemistry DNmI P.O.Box 43Blindern

Using a five point conductivity technique local values of bubble size,bubble velocity and gas fractionhave been experimentally determined in a 288 mmid and 4.3 m high bubble column as a function of axial andradial position for the air/water and CO2/N2/aqueous mDEA *** experimental results are comparedwith predictions from a fundamental two-fluid *** implementation of a non-steady lateral drag term inthe two-fluid model has been *** addition to improving the physical realism of the model,it is found togive slight improvements in the predictions of the distributions of local bubble *** of bubble size arefound in reasonable agreement with experimental values in the heterogeous flow regime,whereas they are stil1found to be unreliable at low gas *** void predictions are found in reasonable agreement with experi-mental values,but deviations occur in the homogeneous flow regime towards the *** is attributed to defi-ciencies in the simplified bubble size

关键词： Bubble column bubble size distribution volumetric velocity gas fraction two-fluid model

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

分子内旋转的阻碍势函数

引用

物理学报 1962年第3期 143-158页

作者：唐敖庆陈世元

根据分子的共同特征,将彼此紧密关联的分子,区别为三种基本类型,利用对称性分析方法,探求出这三类分子的内旋转势函数的一般公式。应用这些公式到具体分子时,能够非常简捷地写出它们的势函数表达式。利用第一类势函数分析具体问题时,... 详细信息

根据分子的共同特征,将彼此紧密关联的分子,区别为三种基本类型,利用对称性分析方法,探求出这三类分子的内旋转势函数的一般公式。应用这些公式到具体分子时,能够非常简捷地写出它们的势函数表达式。利用第一类势函数分析具体问题时,算得的68个分子势垒数值,除少数外,所有计算结果与实验结果的差异均在实验误差范围之内。同时并发现当甲基上的C-h键换成C=C键时,作用能量大为减小;对于具有几个旋转轴的分子,隔开两个以上键间的作用能完全可以忽略。应用第二类势函数,具体联系了五类15个很重要的相关分子,即:Ch2Cl-Ch2Cl,ChCl2-ChCl2和ChCl2-Ch2Cl;Ch2F-Ch2F,ChF2-ChF2和ChF2-Ch2F;CCl2F-CCl2F,CClF2-CClF2和CClF2-CCl2F;Ch2（Ch3）-Ch2（Ch3）,Ch（Ch3）2-Ch（Ch3）2和Ch（Ch3）2-Ch2（Ch3）以及C（Ch3）2Cl-C（Ch3）2Cl,C（Ch3）Cl2-C（Ch3）Cl2和C（Ch3）Cl2-C（Ch3）2Cl。理论上得到的结果和实验数据比较有满意的符合,对尚无实验涉及的某些分子的结与性构能,也在理论上作了一些预测。根据第三类势函数,探计了CClFh-CClFh与C（Ch3）Clh-C（Ch3）Clh两个分子的内旋转;从理论上推测了消式与活性式的内旋转异构体的数目及其构型。

关键词：内旋转 Cl 势垒极小值势函数位函数氯代乙烷

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Gallium-Catalyzed Silicon Oxide Nanowire Growth

引用

Tsinghua Science and Technology 2005年第6期10卷 718-728页

作者： Zheng Wei Pan Sheng Dai Douglas h. Lowndes Department of materials Science and Engineering University of Tennessee Knoxville Tennessee 37996 USA Condensed matter Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee 37830 USA Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee 37830 USA

Silicon oxide nanowires tend to assemble into various complex morphologies through a metalcatalyzed vapor-liquid-solid （VLS） growth process. This article summarizes our recent efforts in the controlled growth of silicon oxide nanowire assemblies by using molten gallium as the catalyst and silicon wafer, SiO powder, or silane （Sill4） as the silicon sources. Silicon oxide nanowire assemblies with morphologies of carrotlike, cometlike, gourdlike, spindlelike, badmintonlike, sandwichlike, etc. were obtained. Although the morphologies of the nanowire assemblies are temperatureand silicon source-dependent, they share similar structural and compositional features： all the assemblies contain a microscale spherical liquid Ga ball and a highly aligned, closely packed amorphous silicon oxide nanowire bunch. The Ga-catalyzed silicon oxide nanowire growth reveals several interesting new nanowire growth phenomena that expand our knowledge of the conventional VLS nanowire growth mechanism.

关键词： gallium silicon oxide nanowires vapor-liquid-solid (VLS) catalyst GaN powder Si wafer sih4 gas SiO powder

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

在普通及奇异变形杆菌中发现的新O抗原(O群)及h抗原

引用

微生物学报 1974年第2期 134-142页

作者：李维丝刘新铭兰州生物制品研究所

本文报告了325株国内分离菌株的分型鉴定结果,和对普通变形杆菌和奇异变形杆菌新O抗原(O群)和新h抗原的研究工作。于国际上Kauffmann和Perch所建立的49个O群之外,提出了9个新的暂订O群;于原有19种h抗原之外,补充了2种新h抗原。 9个暂订... 详细信息

本文报告了325株国内分离菌株的分型鉴定结果,和对普通变形杆菌和奇异变形杆菌新O抗原(O群)和新h抗原的研究工作。于国际上Kauffmann和Perch所建立的49个O群之外,提出了9个新的暂订O群;于原有19种h抗原之外,补充了2种新h抗原。 9个暂订O群是:'306','310','403','501','667','699','412','449'及'462'。2种新h抗原暂订为h20及h21。此外,作者还报告了2种较重要的部分O抗原44_b及5_d。

关键词：抗原对照菌株免疫血清普通变形杆菌变形杆菌属交叉凝集反应

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

LASER PLASmA ASSISTED ChEmICAL VAPOR DEPOSITIONOF SILICON NITRIDE ON STAINLESS STEEL

引用

Acta metallurgica Sinica(English Letters) 1999年第5期12卷 816-820页

作者： Z.Y. Lu 1) , S.m.An 2) , B.h.Cuo 2) , W.m.Li 1) , Y.mei, Y.L.Xia 2) and J.Xu 2) 1) Department of mechanical Engineering, Yangzhou University, Yangzhou 225009, China 2) Dalian University of Technology, Dalian 116024, China

This study raised a new assisted technique used for chemical vapor deposition (CVD) in which a laser beam irradiated the surface of substrate and simultaneously the plasma surroundings created in the reactive room, but both laser and plasma were at lower energy level in order to perform easily. The chemical vapor deposition reaction could be performed only just using simultaneously above two assisted methods. If not, the reaction could not be performed, too. It is laser plasma assisted chemical vapor deposition (LPCVD). For these reasons, a LPCVD device had been designed and manufactured, and was carried on practical operation. The results indicated that this technique is successful and feasible. Acting on the system of sih 4 Nh 3 N 2 with both CO 2 laser and RF plasma, expectant film of silicon nitride had been obtained on the surface of stainless steel.

关键词： CVD laser plasma silicon nitride fil

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

DIELECTRIC PROPERTIES OF NANO Si/C/N COmPOSITE POWDER AND NANO SiC POWDER AT hIGh FREQUENCIES AND mICROSTRUCTURE ChARACTERIZATION

引用

Acta metallurgica Sinica(English Letters) 1999年第5期12卷 1136-1141页

作者： D.L.Zhao, h.S.Zhao and W.C.Zhou State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072,China

The dielectric properties of nano Si/C/N composite powder and nano SiC powder at high frequencies have been studied. The nano Si/C/N composite powder and nano SiC powder were synthesized from hexamethyldisilazane ((me 3Si) 2Nh) (me:Ch 3) and sih 4 C 2h 2 respectively by a laser induced gas phase reaction. The complex permittivities of the nano Si/C/N composite powder and nano SiC powder were measured between 8 2Ghz and 12 4Ghz. The real and imaginary parts of the complex permittivities of nano Si/C/N composite powder are much higher than those of nano SiC powder. The SiC microcrystalline in the nano Si/C/N composite powder dissolved a great deal of nitrogen. The local structure around Si atoms changed by introducing N into SiC. Carbon atoms around Si were substituted by N atoms. So charged defects and quasi free electrons moved in response to the electric field, diffusion or polarization current resulted from the field propagation. The high ε″and loss factor tgδ(ε″/ε′) of Si/C/N composite powder were due to the dielectric relaxation.

关键词： nano Si/C/N composite powder nano SiC powder dielectric properties microstructure

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

蓝宝石上生长的薄膜硅晶体管

引用

计算机研究与发展 1965年第12期 34-37页

作者： G.W.mueller P.h.Robinson 王积祥武家扬

发现了一种在单晶蓝宝石上利用高温分解 sih4来淀积硅薄膜的方法。薄膜的电子衍射和劳埃反射检验都示出了单晶花样。硅薄膜的霍尔迁移率在空穴密度1017/厘米3时为135厘米2/伏特·秒。制成了电流5毫安时具有1000微姆欧跨导值的绝缘栅场... 详细信息

发现了一种在单晶蓝宝石上利用高温分解 sih4来淀积硅薄膜的方法。薄膜的电子衍射和劳埃反射检验都示出了单晶花样。硅薄膜的霍尔迁移率在空穴密度1017/厘米3时为135厘米2/伏特·秒。制成了电流5毫安时具有1000微姆欧跨导值的绝缘栅场效应晶体管,其尺寸为:源到漏的间距为10微米,作用区宽度为120微米。这跨导值可与在块状硅上制成的同样元件相比较,因此这种晶体管是极有希望的薄膜硅器件。

关键词：硅薄膜高温分解跨导分解反应刚玉蓝宝石淀积半导体三极管晶体管

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

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

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

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：