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改变化学基团降低炸药感度的研究

火炸药 1983年第2期 54-57页

作者： s.iyer 范允宋

通过分子组成的改变,可使 RDX 和 TNT 的感度下降。人们已合成 RDX 的亚硝基、三亚硝基的衍生物和3-氨基-TNT,并且进行许多感度试验。结果表明,这些衍生物感度明显下降。从爆炸当量的测定看,得知由于分子组成改变所引起的能量释放的变... 详细信息

通过分子组成的改变,可使 RDX 和 TNT 的感度下降。人们已合成 RDX 的亚硝基、三亚硝基的衍生物和3-氨基-TNT,并且进行许多感度试验。结果表明,这些衍生物感度明显下降。从爆炸当量的测定看,得知由于分子组成改变所引起的能量释放的变化是很小的。1.引言降低炸药的感度具有很大的实用价值。本文主要研究的是实验室内试验 RDX 及 TNT 的钝感。RDX 是一种很重要的军用炸药。但它的感度比实用的要求稍高,致使装填 B 炸药(RDX与 TNT 的混合物)的炮弹在射击时引起过早爆炸。为此,人们一直在实验室内努力进行 RDX

关键词：冲击波感度亚硝基氨基钝感 RDX TNT 间隙试验硝基苯基

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再见,主板!你好,硅直连结构!

科技纵览 2019年第10期 32-37页

作者： Puneet Gupta subramanian s.iyer 不详

长期以来,人们对硬件系统小型化和其他系统大型化的要求越来越高,成为电子产品创新的驱动力。从笔记本电脑到智能手机,再到智能手表、耳戴式设备和其他“看不见的”电子产品的演变过程中,我们即可以看到一些硬件系统小型化的发展。而其... 详细信息

长期以来,人们对硬件系统小型化和其他系统大型化的要求越来越高,成为电子产品创新的驱动力。从笔记本电脑到智能手机,再到智能手表、耳戴式设备和其他“看不见的”电子产品的演变过程中,我们即可以看到一些硬件系统小型化的发展。而其他系统大型化的要求则定义了如今商业数据中心,这些兆瓦级的能耗大户塞满了世界各地那些为特定目的而建造的仓库。

关键词：笔记本电脑数据中心电子产品智能手表智能手机能耗大户主板系统小型化

Molecular Engineering of Naphthalimide Methylcyclohexane Luminogen:Unraveling J^(*)-Aggregation Pattern and sensing Melamine in Aqueous Media

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CCs Chemistry 2024年第4期6卷 923-931页

作者： Kavita Narang Parameswar Krishnan iyer Department of Chemistry Indian Institute of Technology GuwahatiGuwahati 781039Assam Centre for Nanotechnology Indian Institute of Technology GuwahatiGuwahati 781039Assam

Naphthalimide methylcyclohexane(NMICY)luminogen that features molecular conformation-directed aggregation-induced emission was prepared,and its pure equatorial conformer was isolated and wellcharacterized via various techniques,including single-crystal X-ray diffraction(sC-XRD)*** NMICY,the methyl cyclohexane substituent adapted the most stable chair conformation,preventing intermolecularπ-πinteractions among the naphthalimide *** analysis of the self-assembly behavior indicated that an uncommon J^(*)-aggregation pattern was predominant for NMICY that exhibited∼450 nm emission in crystal as well as in the aggregated state[λmax=455 nm,фPL=23.22%,fw=99.9%in water or water-dimethylformamide mixture].NMICY self-assembled into cube-shaped 2D-nanoarchitecture as characterized by fieldemission scanning electron microscopy,atomic force microscopy,and dynamic light scattering(Zavg=143 nm,∼20 nm height)studies while also displaying unique optical properties in the aggregated *** supramolecular self-assembly and aggregated state structure-property relationship in aqueous media of NMICY were optimized,and a facile strategy for the detection of melamine in milk and an aqueous solution of milk powder is reported with a limit of detection value of 0.184 ppm(milk)and 0.101 ppm(milk powder),achieved via the rare acceptor-excited photoinduced electron transfer ***,a smartphone-based,portable,and uncomplicated sensing platform was developed that simplifies the melamine detection process.

关键词： conformational isomers J^(*)-aggregation aggregation-induced emission supramolecular assembly melamine detection acceptor-excited photoinduced electron transfer mechanism

Process Induced stress for CMOs Performance Improvement

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Process Induced Stress for CMOS Performance Improvement

Effect of Eu3+,Bi3+,and Li+ doping on luminescent property of GdNbO4

2006 8th International Conference on solid-state and Integrated Circuit Technology

作者： s.Fang s.s.Tan T.Dyer Z.Luo J.Yan J.J.Kim N.Rovedo Z.Lun J.Yuan X.Chen V.Chan T.J.Tang R.Amos H.Ng M.Ieong s.iyer s.Crowder IBM semiconductor Research and Development Center(sRDC) Hopewell JunctionNY 12533 Chartered semiconductor Manufacturing Infineon Technologies AG samsung Electronics Co. Ltd

＜正＞The integration of 3 major techniques of process induced stress,stress memory technique（sMT）,dual stress liners （DsL）,and stress proximity technique（sPT）,has been demonstrate for advanced CMOs *** device p... 详细信息

ISBN: (纸本)1424401607

关键词： CMOs process surface-mount technology Tensile stress Compressive stress DsL CMOs technology Costs MOsFET circuits Electron mobility Capacitive sensors

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Journal of Rare Earths 2024年第1期42卷 66-75页

作者： s.W.Wi Y.s.Lee Department of Physics and Integrative Institute of Basic sciences Soongsil University

We investigated the emission properties of Eu3+-doped GdNbO4-based oxide phosphors,aiming at improving the Eu3+emission by codoping of Bi3+and Li+.Eu3+singly doped,Eu3+and Bi3+doubly doped,and Eu3+,Bi3+,and Li+triply doped GdNbO4were prepared using a high-temperature solid-state reaction *** red-orange emissions from Eu3+in the singly doped samples are significantly improved by the codoping of Bi3+,mainly due to the energy transfer from Bi3+to Eu3+.The additional codoping of Li+is found to increase the Eu3+emission *** improvement might be attributed to the increase in the photoluminescent quantum yield originating from larger grain sizes and better crystallinity.A detailed analysis of the X-ray diffraction pattern and the asymmetric ratio estimated from the photoluminescence spectra show that the local lattice environment around Eu3+in GdNbO4does not change significantly with the codoping of Bi3+and Li+.Our results indicate that Li+doping is a promising way to improve the emission properties of rare-earth ion-doped GdNbO4phosphors.

关键词： Eu 3+ GdNbO 4 Codoping of Li + Photoluminescence sensitizer Rare earths

First evidence for chiral wobbling of triaxial nuclei

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Nuclear science and Techniques 2024年第7期35卷 4-7页

作者： s.Frauendorf Department of Physics and Astronomy University of Notre DameNotre DameIN 46556USA

Chirality(Greek“handiness”)is a property of many com-plex *** molecules exist in two forms,one being the mirror image of the *** for our hands,it is impossible to make the images identical by a suitable *** two forms are called left-handed and *** have the same binding energy,because the electro-magnetic interaction,which holds the molecule together,does not change under a *** properties that are insensitive to the geometry are also the *** different geometry is the reason why the left-handed form turns the polarization plane of transmitted light in one direction by some angle while the right-handed form turns it in the oppo-site direction by the same ***,the geometrical differences between the two species may have other *** two species of the carvon molecule shown in Fig.1 taste quite differently.

关键词： turns Chiral mirror

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Tribological behavior of lubricant-impregnated porous polyimide

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Friction 2024年第4期12卷 711-725页

作者： Jinbang LI Ningning ZHOU Janet s.s.WONG school of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control EngineeringBeijing 100029China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

Porous materials impregnated with lubricants can be used in conditions where limited lubricant is *** this work,three porous polyimides(PPI)with different densities were ***(PAO)impregnated PPI(iPPI)discs were rubbed against steel and sapphire *** operando observations of the iPPI-sapphire contacts show that oil is released under an applied load,forming a meniscus around *** at the outlet is created at high sliding *** amount of released oil increases with increasing PPI *** moduli,E*,estimated based on the actual contact size show that trapped oil in iPPIs contributes to load *** higher speeds,tribological rehydration of the contact occurs in low density iPPI,with that E*rises with *** high density PPIs,high speeds give a constantly high E*which is limited by the viscoelastic properties of the PPI network and possibly the rate of oil *** of iPPI-steel contacts is governed by the mechanical properties of the PPI,the flow of the lubricant,and the roughness of the PPI *** low-and medium-density(highly porous,high roughness)PPIs,large amount of oil is released,and lubrication is mainly via lubricant restricted in the contact in the pores and possibly tribological *** high density(low porosity)PPI,with lower roughness,hydrodynamic lubrication is achieved which gives the lowest *** results show that polymeric porous materials for effective lubrication require the optimization of its surface roughness,stiffness,oil flow,and oil retentions.

关键词： polyimide porous material friction mechanism polymer limited lubrication

MR弹性成像和扩散加权成像鉴别肝脏良恶性病变的比较研究

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国际医学放射学杂志 2016年第2期 213-213页

作者： T.P.Hennedige J.T.P.D.Hallinan F.P.Leung L.L.s.Teo s.iyer G.Wang 董雪 Department of Radiology Mayo Clinic

摘要目的旨在比较MR弹性成像(MRE)和DWI区分肝脏局灶性病变(FLL)良恶性的诊断价值。材料与方法 79例病人共124处肝脏局灶性病变(其中44处良性,80处恶性),这些病灶都进行了MRE和DWI扫描。MRE采用一种改进的梯度回波序列,DWI采用自由呼吸... 详细信息

摘要目的旨在比较MR弹性成像(MRE)和DWI区分肝脏局灶性病变(FLL)良恶性的诊断价值。材料与方法 79例病人共124处肝脏局灶性病变(其中44处良性,80处恶性),这些病灶都进行了MRE和DWI扫描。MRE采用一种改进的梯度回波序列,DWI采用自由呼吸技术(b=0.500)。从而得到表观扩散系数(ADC)图和刚度图。FLL的平均刚度和ADC值的测量,是通过病灶兴趣区的刚度和ADC值获得的。

关键词：良恶性 DWI MRE 弹性成像 MR

Enhancing fatigue performance of AZ31 magnesium alloy components fabricated by cold metal transfer-based wire arc directed energy deposition through LPB

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Journal of Magnesium and Alloys 2024年第4期12卷 1638-1662页

作者： shambhu Kumar Manjhi srikanth Bontha A.s.s.Balan Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkalSrinivasanagarMangaloreKarnataka 575025India

Cold Metal Transfer-Based Wire Arc Directed Energy Deposition(CMT-WA-DED)presents a promising avenue for the rapid fabrication of components crucial to automotive,shipbuilding,and aerospace ***,the susceptibility to fatigue of CMT-WA-DED-produced AZ31 Mg alloy components has impeded their widespread adoption for critical load-bearing *** this study,a comprehensive investigation into the fatigue behaviour of WA-DED-fabricated AZ31 Mg alloy has been carried out and compared to commercially available wrought AZ31 *** findings indicate that the as-deposited parts exhibit a lower fatigue life than wrought Mg alloy,primarily due to poor surface finish,tensile residual stress,porosity,and coarse grain microstructure inherent in the WA-DED *** Plasticity Burnishing(LPB)treatment is applied to mitigate these issues,which induce significant plastic deformation on the *** treatment resulted in a remarkable improvement of fatigue life by 42%,accompanied by a reduction in surface roughness,grain refinement and enhancement of compressive residual stress ***,during cyclic deformation,WA-DED specimens exhibited higher plasticity and dislocation density compared to both wrought and WA-DED+LPB specimens.A higher fraction of Low Angle Grain Boundaries(LAGBs)in WA-DED specimens contributed to multiple crack initiation sites and convoluted crack paths,ultimately leading to premature *** contrast,wrought and WA-DED+LPB specimens displayed a higher percentage of High Angle Grain Boundaries(HAGBs),which hindered dislocation movement and resulted in fewer crack initiation sites and less complex crack paths,thereby extending fatigue *** findings underscore the effectiveness of LPB as a post-processing technique to enhance the fatigue performance of WA-DED-fabricated AZ31 Mg alloy *** study highlights the importance of LPB surface treatment on AZ31 Mg components produced by CMT-WA-DED to remove surface d

关键词： Wire arc additive manufacturing AZ31 Mg alloy Low plasticity burnishing Low cycle fatigue test strain amplitude

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