By means of first-principles density functional cluster model calculations, we demonstrate that the binding energies of the [4 + 2] cycloaddition products of the 6- and 5-member ring aromatic compounds on the Si(001) surface depend strongly on their resonance energies.
{"title":"Theoretical study of [4 + 2] cycloadditions of some 6- and 5-member ring aromatic compounds on the Si(001)-2 × 1 surface: correlation between binding energy and resonance energy","authors":"Xin Lu, M. Lin, Xin Xu, Nanqin Wang, Qianer Zhang","doi":"10.1039/B104187H","DOIUrl":"https://doi.org/10.1039/B104187H","url":null,"abstract":"By means of first-principles density functional cluster model calculations, we demonstrate that the binding energies of the [4 + 2] cycloaddition products of the 6- and 5-member ring aromatic compounds on the Si(001) surface depend strongly on their resonance energies.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"54 1","pages":"60-62"},"PeriodicalIF":0.0,"publicationDate":"2001-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76198154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Quantum information processing is the use of inherently quantum mechanical phenomena to perform information processing tasks that cannot be achieved using conventional classical information technologies. One famous example is quantum computing, which would permit calculations to be performed that are beyond the reach of any conceivable conventional computer. Initially it appeared that actually building a quantum computer would be extremely difficult, but in the last few years there has been an explosion of interest in the use of techniques adapted from conventional liquid state nuclear magnetic resonance (NMR) experiments to build small quantum computers. After a brief introduction to quantum computing I will review the current state of the art, describe some of the topics of current interest, and assess the long term contribution of NMR studies to the eventual implementation of practical quantum computers capable of solving real computational problems.
{"title":"Quantum computing and nuclear magnetic resonance","authors":"J. A. Jones","doi":"10.1039/b103231n","DOIUrl":"https://doi.org/10.1039/b103231n","url":null,"abstract":"Quantum information processing is the use of inherently quantum mechanical phenomena to perform information processing tasks that cannot be achieved using conventional classical information technologies. One famous example is quantum computing, which would permit calculations to be performed that are beyond the reach of any conceivable conventional computer. Initially it appeared that actually building a quantum computer would be extremely difficult, but in the last few years there has been an explosion of interest in the use of techniques adapted from conventional liquid state nuclear magnetic resonance (NMR) experiments to build small quantum computers. After a brief introduction to quantum computing I will review the current state of the art, describe some of the topics of current interest, and assess the long term contribution of NMR studies to the eventual implementation of practical quantum computers capable of solving real computational problems.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"216 1","pages":"49-56"},"PeriodicalIF":0.0,"publicationDate":"2001-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85356472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Distribution of fluorescence resonance energy transfer (FRET) efficiency between the two ends of a Lennard-Jones polymer chain both at equilibrium and during folding and unfolding has been calculated, for the first time, by Brownian dynamics simulations. The distribution of FRET efficiency becomes bimodal during folding of the extended state subsequent to a temperature quench, with the width of the distribution for the extended state broader than that for the folded state. The reverse process of unfolding subsequent to a upward temperature jump shows different characteristics. The distributions show significant viscosity dependence which can be tested against experiments.
{"title":"Energy transfer efficiency distributions in polymers in solution during folding and unfolding","authors":"G. Srinivas, B. Bagchi","doi":"10.1039/B200595F","DOIUrl":"https://doi.org/10.1039/B200595F","url":null,"abstract":"Distribution of fluorescence resonance energy transfer (FRET) efficiency between the two ends of a Lennard-Jones polymer chain both at equilibrium and during folding and unfolding has been calculated, for the first time, by Brownian dynamics simulations. The distribution of FRET efficiency becomes bimodal during folding of the extended state subsequent to a temperature quench, with the width of the distribution for the extended state broader than that for the folded state. The reverse process of unfolding subsequent to a upward temperature jump shows different characteristics. The distributions show significant viscosity dependence which can be tested against experiments.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"27 1","pages":"59-62"},"PeriodicalIF":0.0,"publicationDate":"2001-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81007186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present a MIDIX basis set for Li that accurately predicts geometries, charge distributions, and partial atomic charges for a test set of compounds at a reasonable cost. MIDIX basis sets, which are also called MIDI!, are heteroatom-polarized split-valence basis sets in which the polarization functions are optimized in order to predict realistic molecular geometries and atomic partial charges. The MIDIX basis set uses the core, inner valence, and outer valence basis functions of the MIDI basis set plus an additional Gaussian basis function. We optimized the p exponent to obtain realistic predictions of geometry, density dipole moments, and Lowdin dipole moments at the Hartree–Fock and hybrid density functional levels of theory, using the mPW1PW91 hybrid density functional for the latter. The MIDIX basis set predicts Hartree–Fock geometries and Hartree–Fock and hybrid density functional Lowdin dipole moments more accurately than either the 3-21G(d) or 6-31G(d) basis set for most of the compounds in our training set. It also predicts more accurate Hartree–Fock and hybrid density functional density dipole moments than the 3-21G(d) basis set. The present results show that the basis set is expected to be very useful for calculating geometries and electrostatic properties of lithium compounds containing H, C, N, O, F, Si, P, S, Cl, Br, and I, especially organolithium and lithium–sulfur compounds.
{"title":"MIDIX basis set for the lithium atom: Accurate geometries and atomic partial charges for lithium compounds with minimal computational cost","authors":"Jason D. Thompson, P. Winget, D. Truhlar","doi":"10.1039/B105076C","DOIUrl":"https://doi.org/10.1039/B105076C","url":null,"abstract":"We present a MIDIX basis set for Li that accurately predicts geometries, charge distributions, and partial atomic charges for a test set of compounds at a reasonable cost. MIDIX basis sets, which are also called MIDI!, are heteroatom-polarized split-valence basis sets in which the polarization functions are optimized in order to predict realistic molecular geometries and atomic partial charges. The MIDIX basis set uses the core, inner valence, and outer valence basis functions of the MIDI basis set plus an additional Gaussian basis function. We optimized the p exponent to obtain realistic predictions of geometry, density dipole moments, and Lowdin dipole moments at the Hartree–Fock and hybrid density functional levels of theory, using the mPW1PW91 hybrid density functional for the latter. The MIDIX basis set predicts Hartree–Fock geometries and Hartree–Fock and hybrid density functional Lowdin dipole moments more accurately than either the 3-21G(d) or 6-31G(d) basis set for most of the compounds in our training set. It also predicts more accurate Hartree–Fock and hybrid density functional density dipole moments than the 3-21G(d) basis set. The present results show that the basis set is expected to be very useful for calculating geometries and electrostatic properties of lithium compounds containing H, C, N, O, F, Si, P, S, Cl, Br, and I, especially organolithium and lithium–sulfur compounds.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"EM-19 2","pages":"72-77"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72612690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The absorption spectrum of C 60 embedded in Ne matrices in the 410–360 nm region is revisited. A complete assignment of the absorption lines therein is proposed in terms of transitions to the ungerade states 1 1 G u , 1 1 T 1u and 2 1 T 1u states, with progressions of Jahn–Teller h g modes and of the totally symmetric a g modes. We also identify a new progression at λ= 375 nm, which we attribute to the transition to a state of G u character and its h g and g g Jahn–Teller modes. Its pure electronic origin is at ∼26700 cm –1 .
重新研究了c60在410 ~ 360nm范围内的吸收光谱。利用Jahn-Teller h G模和完全对称的A G模的级数，提出了其中的吸收谱线的完全赋值，即向非梯度态11gu、11t1u和21t1u态的跃迁。我们还在λ= 375 nm处发现了一个新的级数，我们将其归因于向G特征态及其h G和G G Jahn-Teller模式的过渡。它的纯电子源在~ 26700 cm -1。
{"title":"Assignment of the near-UV absorption spectrum of C60","authors":"A. Sassara, G. Zerza, M. Chergui","doi":"10.1039/B109221A","DOIUrl":"https://doi.org/10.1039/B109221A","url":null,"abstract":"The absorption spectrum of C 60 embedded in Ne matrices in the 410–360 nm region is revisited. A complete assignment of the absorption lines therein is proposed in terms of transitions to the ungerade states 1 1 G u , 1 1 T 1u and 2 1 T 1u states, with progressions of Jahn–Teller h g modes and of the totally symmetric a g modes. We also identify a new progression at λ= 375 nm, which we attribute to the transition to a state of G u character and its h g and g g Jahn–Teller modes. Its pure electronic origin is at ∼26700 cm –1 .","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"80 1","pages":"139-141"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85252019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The global potential energy surfaces of singlet and triplet H 2 O 4 systems have been searched at the B3LYP/6-311G(d, p) level of theory; their relative energies have been calculated at the G2M(CC5)// B3LYP/6-311G(d, p) level. The results show that the most stable intermediate out of the 11 open-chain and cyclic dimers of HO 2 is the singlet HO 4 H chain-structure with C 1 symmetry which lies 19.1 kcal mol –1 below the reactants. The transition states for the production of H 2 O 2 + O 2 (singlet and triplet), H 2 O + O 3 and H 2 + 2O 2 have been calculated at the same level of theory. The results show that the most favored product channel, producing H 2 O 2 + 3 O 2 , occurs by the formation of a triplet six-member-ring intermediate through head-to-tail association with a dual hydrogen-bonding energy of 9.5 kcal mol –1 . The intermediate fragments to give H 2 O 2 + 3 O 2 via a transition state, which lies below the reactants by about 0.5 kcal mol –1 . There are four channels over the singlet surface which can produce 1 O 2 ; all the transition states associated with these channels lie above the reactants by 2.8–5.6 kcal mol –1 at the G2M level. Similarly, the O 3 and H 2 formation channels also occur over the singlet surface with high energy barriers, 5.2 and 74.2 kcal mol –1 , respectively; their formation is kinetically unimportant.
{"title":"The self-reaction of hydroperoxyl radicals: ab initio characterization of dimer structures and reaction mechanisms","authors":"R. Zhu, M. Lin","doi":"10.1039/B107602G","DOIUrl":"https://doi.org/10.1039/B107602G","url":null,"abstract":"The global potential energy surfaces of singlet and triplet H 2 O 4 systems have been searched at the B3LYP/6-311G(d, p) level of theory; their relative energies have been calculated at the G2M(CC5)// B3LYP/6-311G(d, p) level. The results show that the most stable intermediate out of the 11 open-chain and cyclic dimers of HO 2 is the singlet HO 4 H chain-structure with C 1 symmetry which lies 19.1 kcal mol –1 below the reactants. The transition states for the production of H 2 O 2 + O 2 (singlet and triplet), H 2 O + O 3 and H 2 + 2O 2 have been calculated at the same level of theory. The results show that the most favored product channel, producing H 2 O 2 + 3 O 2 , occurs by the formation of a triplet six-member-ring intermediate through head-to-tail association with a dual hydrogen-bonding energy of 9.5 kcal mol –1 . The intermediate fragments to give H 2 O 2 + 3 O 2 via a transition state, which lies below the reactants by about 0.5 kcal mol –1 . There are four channels over the singlet surface which can produce 1 O 2 ; all the transition states associated with these channels lie above the reactants by 2.8–5.6 kcal mol –1 at the G2M level. Similarly, the O 3 and H 2 formation channels also occur over the singlet surface with high energy barriers, 5.2 and 74.2 kcal mol –1 , respectively; their formation is kinetically unimportant.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"1 1","pages":"106-111"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85488530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Izawa, T. Ogasawara, H. Masuda, H. Okabayashi, I. Noda
This report demonstrates the promising potential for the application of generalized two-dimensional correlation analysis to time dependent GPC elution profiles, in analysis of complex dynamic variations in the sol–gel polymerization process.
{"title":"Application of generalized two-dimensional correlation theory to gel permeation chromatographic analysis","authors":"K. Izawa, T. Ogasawara, H. Masuda, H. Okabayashi, I. Noda","doi":"10.1039/B103810A","DOIUrl":"https://doi.org/10.1039/B103810A","url":null,"abstract":"This report demonstrates the promising potential for the application of generalized two-dimensional correlation analysis to time dependent GPC elution profiles, in analysis of complex dynamic variations in the sol–gel polymerization process.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"29 1","pages":"57-59"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85168529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Over the past ten years, there has been a huge increase in desktop computer power, leading to explosive growth of the internet and the now widespread use of electronic media for publication and presentation of scientific documents. These new innovations have provided a challenge, as well as great opportunity, for a visual subject such as chemistry to present itself in a much more appealing way than has previously been possible. This article attempts to demonstrate how easy it is to create visually impressive chemical images and animations, as well as interactive structures and spectra, for use in lectures, on-line courses, electronic journal articles, web pages, etc. This is intended to be an introductory article to show potential authors how easy it is to add valuable extra content to their scientific documents, and at the same time make them more visually attractive. Topics covered include: animated gif images, creating and displaying interactive 3D molecular structures, creating 3D structure animations, creating and displaying molecular orbitals, and interactive spectra.
{"title":"The visualisation of chemical processes for electronic publishing and presentations","authors":"P. May","doi":"10.1039/B103982M","DOIUrl":"https://doi.org/10.1039/B103982M","url":null,"abstract":"Over the past ten years, there has been a huge increase in desktop computer power, leading to explosive growth of the internet and the now widespread use of electronic media for publication and presentation of scientific documents. These new innovations have provided a challenge, as well as great opportunity, for a visual subject such as chemistry to present itself in a much more appealing way than has previously been possible. This article attempts to demonstrate how easy it is to create visually impressive chemical images and animations, as well as interactive structures and spectra, for use in lectures, on-line courses, electronic journal articles, web pages, etc. This is intended to be an introductory article to show potential authors how easy it is to add valuable extra content to their scientific documents, and at the same time make them more visually attractive. Topics covered include: animated gif images, creating and displaying interactive 3D molecular structures, creating 3D structure animations, creating and displaying molecular orbitals, and interactive spectra.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"30 1","pages":"78-88"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83711366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Berenbak, B. Riedmüller, C. Rettner, D. Auerbach, S. Stolte, A. Kleyn
The rotational state distributions of NO molecules scattered off the (1 × 1)H-covered Ru(0001) surface have been investigated by resonance enhanced multi-photon ionisation (REMPI). Angular and energy distributions reported earlier for this scattering channel, show an angular spread of only ≃8° (θ i = 60°, E i = 2.1 eV), combined with small translational energy loss in the collision (E f /E i = 0.91). These observations suggest scattering from a very weakly corrugated surface, a ‘molecular mirror’, and a high probability to yield cold rotational distributions. The present experiments, however, reveal substantial rotational excitation, accompanied by rotational rainbows for higher quantum numbers (J > 20). The rotational temperatures increase from = 450 K at an incidence energy E i = 0.32 eV, to = 950 K at E i = 1.50 eV. The kinetic to rotational energy transfer efficacy, appears to be slightly higher than for NO scattering of the fairly inert Ag(111) surface. This system has much wider angular spread and larger translational energy losses. Assuming parallel momentum conservation in the collision the observed rotational excitation would lead to an angular spread that is considerably smaller than that observed for an incoming angle of θ i = 15°.
用共振增强多光子电离(REMPI)研究了从(1 × 1) h覆盖的Ru(0001)表面散射的NO分子的旋转态分布。该散射通道的角向和能量分布表明，该通道的角向扩散仅为≃8°(θ i = 60°，E i = 2.1 eV)，且碰撞过程中的平动能量损失较小(E f /E i = 0.91)。这些观察结果表明，散射来自一个非常弱的波纹表面，一个“分子镜子”，并且很有可能产生冷旋转分布。然而，目前的实验揭示了大量的旋转激发，并伴随着更高量子数(J > 20)的旋转彩虹。旋转温度从入射能量E i = 0.32 eV时的= 450 K增加到E i = 1.50 eV时的= 950 K。相对于惰性Ag(111)表面的NO散射，其动能到转动的能量传递效率略高。该系统具有更宽的角展和更大的平动能量损失。假设在碰撞中平行动量守恒，观察到的旋转激励将导致的角扩展比θ i = 15°时观察到的角扩展要小得多。
{"title":"Rotational excitation from a molecular mirror: NO scattering from Ru(0001)-(1 × 1)H","authors":"B. Berenbak, B. Riedmüller, C. Rettner, D. Auerbach, S. Stolte, A. Kleyn","doi":"10.1039/B104823F","DOIUrl":"https://doi.org/10.1039/B104823F","url":null,"abstract":"The rotational state distributions of NO molecules scattered off the (1 × 1)H-covered Ru(0001) surface have been investigated by resonance enhanced multi-photon ionisation (REMPI). Angular and energy distributions reported earlier for this scattering channel, show an angular spread of only ≃8° (θ i = 60°, E i = 2.1 eV), combined with small translational energy loss in the collision (E f /E i = 0.91). These observations suggest scattering from a very weakly corrugated surface, a ‘molecular mirror’, and a high probability to yield cold rotational distributions. The present experiments, however, reveal substantial rotational excitation, accompanied by rotational rainbows for higher quantum numbers (J > 20). The rotational temperatures increase from = 450 K at an incidence energy E i = 0.32 eV, to = 950 K at E i = 1.50 eV. The kinetic to rotational energy transfer efficacy, appears to be slightly higher than for NO scattering of the fairly inert Ag(111) surface. This system has much wider angular spread and larger translational energy losses. Assuming parallel momentum conservation in the collision the observed rotational excitation would lead to an angular spread that is considerably smaller than that observed for an incoming angle of θ i = 15°.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"34 1","pages":"66-71"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89915613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
4A, 13X and Na-mordenite (Na-M) reached higher temperatures by the microwave radiation of 5–10 min in the 500 W radiation power and were completely damaged. When 5A was added to 4A, 13X or Na-M with a suitable ratio, the heating temperature of the mixture was suppressed to a desirable range and the mixture reached the dehydration degree of >85% in 15–20 min. The mixtures irradiated in desirable conditions only slightly decreased their absorption ability for water (by <5% per radiation treatment). The proposed method could quickly and simply reactivate the zeolites up to a high level with a domestic type microwave oven.
{"title":"Simple suppressing method of thermal runaway in microwave heating of zeolite and its application","authors":"Ohgushi Tatsuo, Wakana Akiko","doi":"10.1039/B009067K","DOIUrl":"https://doi.org/10.1039/B009067K","url":null,"abstract":"4A, 13X and Na-mordenite (Na-M) reached higher temperatures by the microwave radiation of 5–10 min in the 500 W radiation power and were completely damaged. When 5A was added to 4A, 13X or Na-M with a suitable ratio, the heating temperature of the mixture was suppressed to a desirable range and the mixture reached the dehydration degree of >85% in 15–20 min. The mixtures irradiated in desirable conditions only slightly decreased their absorption ability for water (by <5% per radiation treatment). The proposed method could quickly and simply reactivate the zeolites up to a high level with a domestic type microwave oven.","PeriodicalId":20106,"journal":{"name":"PhysChemComm","volume":"87 1","pages":"18-20"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76986006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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