检索结果-南通市图书馆

Defence Technology（防务技术） 2024年第4期34卷 11-18页

作者： Jacky Cailes Robert Dunsmore Kathryn L.Linge ChemCentre PO Box 1250PerthAustralia

The Marplex Convention was established to prevent the manufacture of unmarked plastic explosives and stipulates that a volatile detection agent must be added at the time of ***,to-date,laboratory testing remains the internationally accepted practice for identifying and quantifying the taggants stipulated in the *** this project,portable FTIR and raman instruments were tested for their ability to detect 2,3-dimethyl-2,3-dinitrobutane(DMDNB),the chemical marker incorporated in plastic explosives that are manufactured within *** both FTIR and raman instruments detected solid DMDNB(98%purity),field analysis of plastic explosives at an Australian Defence establishment showed that both FTIR and raman spectra were matched the relevant explosive(RDX or PETN),rather than the DMDNB *** all three plastic explosives tested,the concentration of DMDNB was measured by SPME-GC-MS to be between 1.8 and 2%,greater than the minimum 1%concentration stipulated by the Marplex *** testing with a plastic explosive analogue confirmed that the minor absorption peaks that would characterize low concentrations of DMDNB were masked by absorption bands from other compounds within the ***,while both FTIR and raman spectroscopy are suitable for detection of plastic explosives,neither rely on the presence of DMDNB for *** is likely that similar results would be found for other taggants stipulated by the Marplex Convention,given they are also present in concentrations less than 1%.

关键词： Explosive ICAO taggants 2,3-Dimethyl-2,3-dinitrobutane(DMDNB) Fourier transform infrared(FTIR) raman

Shock raman spectra and structural transformation of powdered TKX-50 by the plate impact experiments combined with real-time raman detection

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第1期31卷 158-162页

作者： Xue Yang Qijun Liu Yundan Gan Lei Yang Zhengtang Liu Fusheng Liu Bond and Band Engineering Group School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China Xi'an Modern Chemistry Research Institute Xi'an 710065People's Republic of China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072People's Republic of China

As an energetic material of great interest,the work capacity of dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate(TKX-50)has been questioned *** some research groups have explored the reasons for the low working ability of TKX-50,the plane impact experiment on powdered TKX-50 is obviously closer to the practical application,and the conclusions based on this are more ***,we performed shock Hugoniot measurements of powdered TKX-50 between 5.65 and 16.29 *** plane impact experiments of powdered TKX-50 were carried out and the shocked raman spectra were *** raman spectroscopy analysis,a new peak of powdered TKX-50 was found between19.47 GPa and 24.96 GPa,which may be caused by decomposition/phase transition and was related with the low work capacity.

关键词： Powdered TKX-50 Hugoniot raman Decomposition Phase transition

Semi-quantitative analysis of the structural evolution of mesophase pitch-based carbon foams by raman and FTIR spectroscopy

在线全文

学校读者我要写书评

暂无评论

新型炭材料（中英文） 2024年第4期39卷 668-680页

作者： LIU Yue CHANG Sheng-kai SU Zhan-peng HUANG Zu-jian QIN Ji YANG Jian-xiao Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology College of Materials Science and EngineeringHunan UniversityChangsha410082China

Graphitized carbon foams(GFms)were prepared using mesophase pitch(MP)as a raw material by foaming(450℃),pre-oxidation(320℃),carbonization(1000℃)and graphitization(2800℃).The differences in structure and properties of GFms prepared from different MP precursors pretreated by ball milling or liquid phase extraction were investigated and compared,and semi-quantitative calculations were conducted on the raman and FTIR spectra of samples at each preparation ***-quantitat-ive spectroscopic analysis provided detailed information on the structure and chemical composition changes of the MP and GFm de-rived from *** with microscopic observations,the change from precursor to GFm was *** results showed that ball milling concentrated the distribution of aromatic molecules in the pitch,which contributed to uniform foaming to give a GFm with a uniform pore distribution and good *** phase extraction helped remove light components while retaining large aromatics to form graphitic planes with the largest average size during post-treatment to produce a GFm with the highest degree of graphitization and the fewest open pores,giving the best compression resistance(2.47 MPa),the highest thermal conductivity(64.47 W/(m·K))and the lowest electrical resistance(13.02μΩ·m).Characterization combining semi-quantitative spectroscopic ana-lysis with microscopic observations allowed us to control the preparation of the MP-derived GFms.

关键词： Mesophase pitch Carbon foams raman FTIR Graphitization

不同变质程度煤中镜质组的元素分布特征:基于raman和原位微区XRF分析

在线全文

学校读者我要写书评

暂无评论

地质学报 2024年第8期98卷 2472-2485页

作者：刘超谢鹏鸿孙蓓蕾常洋梅太原理工大学矿业工程学院山西太原030024 太原理工大学煤科学与技术教育部重点实验室山西太原030024

为明确煤中元素与有机质之间的关系,本文选择山西太原西山煤田6个矿区石炭系—二叠系太原组8号煤层煤样(镜质体最大反射率为1.26%~2.03%)为研究对象,挑选其中的镜煤条带,利用激光共聚焦拉曼光谱仪(raman)选出镜质组,结合微区X射线荧光... 详细信息

为明确煤中元素与有机质之间的关系,本文选择山西太原西山煤田6个矿区石炭系—二叠系太原组8号煤层煤样(镜质体最大反射率为1.26%~2.03%)为研究对象,挑选其中的镜煤条带,利用激光共聚焦拉曼光谱仪(raman)选出镜质组,结合微区X射线荧光光谱仪(μ-XRF)对镜质组中元素含量和分布特征进行分析,试图探讨不同变质程度煤中镜质组的拉曼光谱和元素的耦合关系。研究发现,镜质组中仍然存在着大量的纳米级矿物,在实验操作过程中即使raman光谱的结果限定了有机组分,但是由于束斑大小的差异,μ-XRF测试时不可避免的受到了煤中纳米级矿物的影响;Al、Si、K、Ti、V、Fe、Co、Ca主要赋存于镜质组中的纳米级矿物中,Ni、Zn、Ga、Ge、Br、S则主要以有机结合态的形式存在。

关键词：西山煤田8号煤不同变质程度煤镜质组 raman μ-XRF

CNMR、FT-IR、raman和建模技术对烟煤和无烟煤分子结构的应用研究

在线全文

学校读者我要写书评

暂无评论

太原理工大学学报 2024年

作者：李元吉代诚欣孟上九张保勇张强黑龙江科技大学安全工程学院

煤化作用过程中煤的分子结构演化研究已较为普遍，但煤结构的非均质性及复杂性，制约了高精度煤的结构演化及其机理的定量表征研究。通过显微组分鉴定、镜质体反射率、工业品质、元素分析和光谱分析，确定了烟煤(FS1)和无烟煤(ZY1)碳骨... 详细信息

煤化作用过程中煤的分子结构演化研究已较为普遍，但煤结构的非均质性及复杂性，制约了高精度煤的结构演化及其机理的定量表征研究。通过显微组分鉴定、镜质体反射率、工业品质、元素分析和光谱分析，确定了烟煤(FS1)和无烟煤(ZY1)碳骨架结构、官能团的赋存状态等信息。并通过计算机辅助分子设计建立2个分子结构模型。结果表明，随着煤化作用的进行，烟煤到无烟煤过程中，亚甲基的损失速率比甲基的损失速率快，芳香性增强，芳香环的脂肪族链变短且支化度较高，含氧官能团逐渐减少，煤结晶程度增强，煤的化学结构趋于成熟稳定。且煤中的脂肪碳减少，芳香碳增加，甲基碳和亚甲基碳含量减少。经过多次尝试确定了芳香炭、脂肪族侧链和氧官能团之间的键合模式，获得最终的分子结构模型：C175H162O13N2(FS1)、C190H159O5N3(ZY1)。该模型较好地反映煤的真实的结构，模拟的13C NMR 光谱与实验光谱具有良好的一致性。上述研究为不同变质程度煤的分子结构演化提供了理论参考，为建立高可信度的分子结构表征提供了方法。

关键词：煤 CNMR FT-IR raman 分子结构模型

raman scattering study of magnetic layered MPS_3 crystals(M = Mn, Fe, Ni)

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 Physics B 2019年第5期28卷 226-231页

作者： Yi-Meng Wang Jian-Feng Zhang Cheng-He Li Xiao-Li Ma Jian-Ting Ji Feng Jin He-Chang Lei Kai Liu Wei-Lu Zhang Qing-Ming Zhang Department of Physics Renmin University of China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Department of Engineering and Applied Sciences Sophia University School of Physical Science and Technology Lanzhou University

We report a comprehensive raman scattering study on layered MPS_3(M = Mn, Fe, Ni), a two-dimensional magnetic compound with weak van der Waals interlayer coupling. The observed raman phonon modes have been well assigned by the combination of first-principles calculations and the polarization-resolved spectra. Careful symmetry analysis on the angle-dependent spectra demonstrates that the crystal symmetry is strictly described by C_(2h)but can be simplified to D_(3d) with good accuracy. Interestingly, the three compounds share exactly the same lattice structure but show distinct magnetic structures. This provides us with a unique opportunity to study the effect of different magnetic orders on lattice dynamics in MPS_3. Our results reveal that the in-plane Nel antiferromagnetic(AF) order in MnPS_3 favors a spin–phonon coupling compared to the in-plane zig-zag AF in NiPS_3 and FePS_3. We have discussed the mechanism in terms of the folding of magnetic Brillouin zones. Our results provide insights into the relation between lattice dynamics and magnetism in the layered MPX_3(M = transition metal, X = S, Se) family and shed light on the magnetism of monolayer MPX_3 materials.

关键词： raman scattering two-dimensional magnetic van der Waals materials lattice dynamics magnetism

raman spectroscopy of diesel and gasoline engine-out soot using different laser power

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第5期31卷 74-80页

作者： Haiwen Ge Zhipeng Ye Rui He Department of Mechanical Engineering Texas Tech University Department of Electrical and Computer Engineering Texas Tech University

We studied engine-out soot samples collected from a heavy-duty direct-injection diesel engine and port-fuel injection gasoline spark-ignition engine. The two types of soot samples were characterized using raman spectroscopy with different laser powers. A Matlab program using least-square-method with trust-region-reflective algorithm was developed for curve fitting. A DOE(design of experiments) method was used to avoid local convergence. The method was used for two-band fitting and three-band fitting. The fitting results were used to determine the intensity ratio of D(for "Defect" or "Disorder") and G(for"Graphite") raman bands. It is found that high laser power may cause oxidation of soot sample, which gives higher D/G intensity ratio. Diesel soot has consistently higher amorphous/graphitic carbon ratio, and thus higher oxidation reactivity, compared to gasoline soot, which is reflected by the higher D/G intensity ratio in raman spectra measured under the same laser power.

关键词： raman spectroscopy Diesel engine Gasoline engine Soot emission Particulate matter

raman spectroscopy characterization of two-dimensional materials

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第3期27卷 80-93页

作者： Fang Liang Hejun Xu Xing Wu Chaolun Wang Chen Luo Jian Zhang Shanghai Key Laboratory of Multidimensional Information Processing Department of Electronic Engineering East China Normal University Shanghai 200241 China

Two-dimensional （2D） materials have become a hot study topic in recent years due to their outstanding electronic, optical, and thermal properties. The unique band structures of strong in-plane chemical bonds and weak out-of-plane van der Waals （vdW） interactions make 2D materials promising for nanodevices and various other applications. raman spectroscopy is a powerful and non-destructive characterization tool to study the properties of 2D materials. In this work, we review the research on the characterization of 2D materials with raman spectroscopy. In addition, we discuss the application of the raman spectroscopy technique to semiconductors, superconductivity, photoelectricity, and thermoelectricity.

关键词： raman MoS2 graphene 2D materials non-destructive characterization

raman Scattering from Fine Zn Particles Coated with ZnO

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1996年第10期13卷 765-767页

作者： XU Jian-feng CHENG Guang-xu DU You-wei Department of Physics and Laboratory of Solid State Microstructures Center of Materials Analysis Nanjing UniversityNanjing 210093

raman scattering from Zn fine spheric particles coated with ZnO of variable thickness is measured, and a broad line can be found. The raman line shifts to lower frequency side with the increase of oxide thickness. A theoretical analysis based on the existence of surface phonon mode has been made. Agreement between experiment and theory is good.

关键词： raman scattering theory

raman SPECTRAL STUDY ON ISOPOLYTUNGSTATES IN AQUEOUS SOLUTION

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

中国有色金属学会会刊：英文版 1998年第4期8卷 157-161页

作者： Liu, Shijun Chen, Qiyuan Zhang, Pingmin Li, Songqin Central South Univ of Technology Changsha China

ＩＮＴＲＯＤＵＣＴＩＯＮＡｌａｒｇｅｎｕｍｂｅｒｏｆｓｔｕｄｉｅｓｈａｖｅｂｅｎｄｏｎｅｉｎｔｈｅｆｉｅｌｄｏｆｔｈｅａｑｕｅｏｕｓｃｈｅｍｉｓｔｒｙｏｆｉｓｏｐｏｌｙｔｕｎｇｓｔａｔｅｕｓｉｎｇｎｕｍｅｒｏｕｓｅ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＡｌａｒｇｅｎｕｍｂｅｒｏｆｓｔｕｄｉｅｓｈａｖｅｂｅｎｄｏｎｅｉｎｔｈｅｆｉｅｌｄｏｆｔｈｅａｑｕｅｏｕｓｃｈｅｍｉｓｔｒｙｏｆｉｓｏｐｏｌｙｔｕｎｇｓｔａｔｅｕｓｉｎｇｎｕｍｅｒｏｕｓｅｘｐｅｒｉｍｅｎｔａｌｍｅｔｈｏ...

关键词： raman spectra isopolytungstate paratungstate metatungstate