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Measurement of the Anisotropy of the Angular Distributions of Fragments and the Cross Section for the Neutron-Induced Fission of 242Pu Nuclei in the Energy Range of 0.3–500 MeV 242Pu核在0.3 ~ 500 MeV能量范围内裂变碎片角分布和截面的各向异性测量
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S0021364025605676
A. S. Vorobyev, A. M. Gagarski, O. A. Shcherbakov, L. A. Vaishnene, A. M. Tiagelskaia, N. M. Olkhovich, A. L. Barabanov, T. E. Kuz’mina
{"title":"Measurement of the Anisotropy of the Angular Distributions of Fragments and the Cross Section for the Neutron-Induced Fission of 242Pu Nuclei in the Energy Range of 0.3–500 MeV","authors":"A. S. Vorobyev,&nbsp;A. M. Gagarski,&nbsp;O. A. Shcherbakov,&nbsp;L. A. Vaishnene,&nbsp;A. M. Tiagelskaia,&nbsp;N. M. Olkhovich,&nbsp;A. L. Barabanov,&nbsp;T. E. Kuz’mina","doi":"10.1134/S0021364025605676","DOIUrl":"10.1134/S0021364025605676","url":null,"abstract":"<p>The angular distributions of fragments and the cross section for the neutron-induced fission of <sup>242</sup>Pu nuclei in the energy range of 0.3–500 MeV have been measured using the time-of-flight spectrometer of the GNEIS neutron complex at the Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute. Fission fragments have been detected using low-pressure position-sensitive multiwire proportional counters. The <sup>242</sup>Pu<span>((n,f))</span> fission cross section has been measured with respect to the <sup>235</sup>U<span>((n,f))</span> fission cross section. The data obtained are compared to the results of previous experiments, as well as to estimates from various evaluated data libraries.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"497 - 505"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of the Focus Position on Preplasma Formation and Ion Acceleration in Laser Irradiation of a Flat Target 激光照射平面靶时焦点位置对预等离子体形成和离子加速的影响
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S002136402560020X
K. V. Safronov, A. V. Brantov, V. A. Flegentov, N. N. Shamaeva, S. A. Gorokhov, A. S. Tishchenko, D. O. Zamuraev, N. A. Fedorov, S. F. Kovaleva, A. L. Shamraev, S. I. Glazyrin, M. A. Rakitina, V. Yu. Bychenkov
{"title":"Influence of the Focus Position on Preplasma Formation and Ion Acceleration in Laser Irradiation of a Flat Target","authors":"K. V. Safronov,&nbsp;A. V. Brantov,&nbsp;V. A. Flegentov,&nbsp;N. N. Shamaeva,&nbsp;S. A. Gorokhov,&nbsp;A. S. Tishchenko,&nbsp;D. O. Zamuraev,&nbsp;N. A. Fedorov,&nbsp;S. F. Kovaleva,&nbsp;A. L. Shamraev,&nbsp;S. I. Glazyrin,&nbsp;M. A. Rakitina,&nbsp;V. Yu. Bychenkov","doi":"10.1134/S002136402560020X","DOIUrl":"10.1134/S002136402560020X","url":null,"abstract":"<p>It has been demonstrated experimentally and in the theoretical calculation that the energy of protons accelerated by a 60-TW femtosecond laser pulse can be increased by choosing the optimal position of the focus spot relative to the surface of the irradiated target at a given nanosecond pedestal due to amplified spontaneous emission. This position is determined as the best focusing option that ensures a sufficiently efficient matching of incident and preplasma-trapped laser radiation under the conditions of emerging self-consistent spatial profiles of the preplasma and crater (i.e., the remaining thickness of the target) on the irradiated surface. At the same time, the focal spot does not lie on the surface of the target, but is shifted into the preplasma, which makes it possible to raise the maximum proton energy by a factor of 1.5.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"536 - 544"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S002136402560020X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
13C and 11B NMR Spectroscopy of High-Pressure High-Temperature Boron-Doped Diamonds 高压高温掺硼金刚石的13C和11B核磁共振波谱
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S0021364025605834
Z. N. Volkova, V. P. Filonenko, R. Kh. Bagramov, I. P. Zibrov, N. M. Shchelkachev, G. D. Rybalov, V. V. Brazhkin
{"title":"13C and 11B NMR Spectroscopy of High-Pressure High-Temperature Boron-Doped Diamonds","authors":"Z. N. Volkova,&nbsp;V. P. Filonenko,&nbsp;R. Kh. Bagramov,&nbsp;I. P. Zibrov,&nbsp;N. M. Shchelkachev,&nbsp;G. D. Rybalov,&nbsp;V. V. Brazhkin","doi":"10.1134/S0021364025605834","DOIUrl":"10.1134/S0021364025605834","url":null,"abstract":"<p>Diamond micropowders with a boron content of 1 and 2.5% that have been synthesized under high pressure and high temperature conditions and studied. The method of nuclear magnetic resonance on <sup>13</sup>C and <sup>11</sup>B nuclei has been used for a comparative analysis of boron-doped diamond and boron-doped graphite. It has been shown that the structure of diamonds with a high boron content is disordered and contains a significant amount of carbon with trigonal coordination. The main signal in the <sup>11</sup>B spectra of diamond microcrystals is due to the sum of contributions from single boron atoms with tetragonal and trigonal carbon environments. An additional signal in the spectra with a chemical shift of more than 60 ppm can be due to boron atoms in the areas of dislocation clusters, sub-boundaries, and other defective areas.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"583 - 588"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605834.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nature of the Local Pairing of Charge Carriers in the Family of High-Temperature Superconductors Based on BaBiO3 (Brief Review) 基于BaBiO3的高温超导体族中载流子局部配对的性质（综述）
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S0021364025605524
A. P. Menushenkov
{"title":"Nature of the Local Pairing of Charge Carriers in the Family of High-Temperature Superconductors Based on BaBiO3 (Brief Review)","authors":"A. P. Menushenkov","doi":"10.1134/S0021364025605524","DOIUrl":"10.1134/S0021364025605524","url":null,"abstract":"<p>A model of the local pairing of charge carriers in real space in a family of bismuthate high-temperature superconducting oxides based on X-ray absorption spectroscopy data using synchrotron and X-ray free-electron laser radiation is presented. The nature of the two band gaps and the insulator state of barium bismuthate BaBiO<sub>3</sub>, the metallic state of the barium plumbate BaPbO<sub>3</sub>, as well as the phase diagram and the appearance of superconductivity in lead- and potassium-doped BaBiO<sub>3</sub>, has been explained. The possibility of implementing both phonon and electron pairing mechanisms is discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"562 - 571"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605524.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laser Acceleration of Electrons: “Laser Buller” or “Bubble”? 电子的激光加速：“激光子弹”还是“气泡”？
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S0021364025605652
V. Yu. Bychenkov, A. J. Castillo, S. G. Bochkarev, M. G. Lobok
{"title":"Laser Acceleration of Electrons: “Laser Buller” or “Bubble”?","authors":"V. Yu. Bychenkov,&nbsp;A. J. Castillo,&nbsp;S. G. Bochkarev,&nbsp;M. G. Lobok","doi":"10.1134/S0021364025605652","DOIUrl":"10.1134/S0021364025605652","url":null,"abstract":"<p>The most effective mechanism for laser acceleration of electrons is the relativistic self-trapping of an intense light pulse, which makes it possible to achieve the extreme charge of high-energy particle bunches and the extreme conversion coefficient, which can be implemented in the characteristic regimes called “laser bullet” and “bubble.” To quantitively compare the efficiencies of these regimes, three-dimensional numerical simulation is required. Such a simulation has been carried out for relativistically intense joule ultrashort pulses. The obtained results indicate a higher yield of high-energy (15–30 MeV) electrons of interest for radiation-nuclear applications accelerated in the laser bullet regime.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"512 - 519"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605652.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spintronic Detector of Linearly Polarized Microwave Radiation Based on a Ferromagnet/Normal Metal Heterostructure 基于铁磁体/正常金属异质结构的线极化微波辐射自旋电子探测器
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S002136402460530X
K. D. Samoilenko, D. A. Volkov, D. A. Gabrielyan, A. A. Matveev, A. R. Safin, D. V. Kalyabin, A. A. Khafizov, M. N. Markelova, A. R. Kaul’, I. E. Moskal’, G. A. Ovsyannikov, S. A. Nikitov
{"title":"Spintronic Detector of Linearly Polarized Microwave Radiation Based on a Ferromagnet/Normal Metal Heterostructure","authors":"K. D. Samoilenko,&nbsp;D. A. Volkov,&nbsp;D. A. Gabrielyan,&nbsp;A. A. Matveev,&nbsp;A. R. Safin,&nbsp;D. V. Kalyabin,&nbsp;A. A. Khafizov,&nbsp;M. N. Markelova,&nbsp;A. R. Kaul’,&nbsp;I. E. Moskal’,&nbsp;G. A. Ovsyannikov,&nbsp;S. A. Nikitov","doi":"10.1134/S002136402460530X","DOIUrl":"10.1134/S002136402460530X","url":null,"abstract":"<p>The effect of the polarization of microwave radiation on the efficiency of ferromagnetic resonance excitation and spin pumping from a ferromagnetic lutetium garnet Lu<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> thin film into normal metal Pt has been studied. The voltages created due to the inverse spin Hall effect in a Pt layer have been measured when the polarization of the exciting electromagnetic wave changed from linear to circular. It has been experimentally established and theoretically confirmed that the electromagnetic radiation component perpendicular to the static magnetization direction determines the nonzero potential difference created in the normal metal layer. The considered “ferromagnet–normal metal” heterostructure can be used as a tunable resonant detector of polarized microwave radiation and as polarization filters. The data on the practical application of Lu<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>/Pt are extremely relevant for modern telecommunications.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"554 - 561"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum Entanglement in Quasi-Equilibrium States in the Multipulse Spin Locking of the Nuclear Magnetic Resonance 核磁共振多脉冲自旋锁定中准平衡态的量子纠缠
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S002136402560572X
G. A. Bochkin, S. G. Vasil’ev, E. I. Kuznetsova, E. B. Fel’dman
{"title":"Quantum Entanglement in Quasi-Equilibrium States in the Multipulse Spin Locking of the Nuclear Magnetic Resonance","authors":"G. A. Bochkin,&nbsp;S. G. Vasil’ev,&nbsp;E. I. Kuznetsova,&nbsp;E. B. Fel’dman","doi":"10.1134/S002136402560572X","DOIUrl":"10.1134/S002136402560572X","url":null,"abstract":"<p>Quantum entanglement is studied NMR multipulse spin locking, when a system of spins coupled by the dipole–dipole interaction in a strong magnetic field is irradiated by a sequence of resonant high-frequency <span>(varphi )</span>-pulses with the same time delay <span>(2tau )</span> between successive pulses. For times <span>(t sim {{T}_{2}})</span> (<span>({{T}_{2}} approx omega _{{{text{loc}}}}^{{ - 1}})</span>, <span>({{omega }_{{{text{loc}}}}})</span> is determined by the dipole–dipole interaction), quasi-equilibrium with a structure depending on the relation between the pulsed field <span>({{omega }_{1}} = varphi {text{/}}2tau )</span> and <span>({{omega }_{{{text{loc}}}}})</span> is established in the system. For <span>({{omega }_{1}} lessapprox {{omega }_{{{text{loc}}}}})</span>, a one-temperature quasi-equilibrium state arises, while a quasi-equilibrium with the dipole and Zeeman temperatures appears for <span>({{omega }_{1}} gg {{omega }_{{{text{loc}}}}})</span>. The temperature dependence of entanglement is investigated for <span>({{omega }_{1}} lessapprox {{omega }_{{{text{loc}}}}})</span>. For <span>({{omega }_{1}} gg {{omega }_{{{text{loc}}}}})</span>, the further evolution of the system is determined by the Provotorov equations and leads to the equalization of the dipole and Zeeman temperatures. It is shown that the entanglement is absent in this case.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"572 - 576"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Metamagnetic Transition in a van der Waals Antiferromagnet 范德华反铁磁体的超磁跃迁
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S0021364025600284
A. K. Zvezdin, M. A. Koliushenkov, A. P. Pyatakov
{"title":"Metamagnetic Transition in a van der Waals Antiferromagnet","authors":"A. K. Zvezdin,&nbsp;M. A. Koliushenkov,&nbsp;A. P. Pyatakov","doi":"10.1134/S0021364025600284","DOIUrl":"10.1134/S0021364025600284","url":null,"abstract":"<p>The specificity of a metamagnetic transition in van der Waals antiferromagnets are considered for a CrI<sub>3</sub> bilayer, which is a two-dimensional antiferromagnet. Special attention is paid to the type of magnetoelectric effect that manifests itself as an electric-field-induced transition from the antiferromagnetic to the ferromagnetic state in a bias magnetic field close to the critical transition field. Its supposed mechanism is the linear magnetoelectric effect allowed by the crystal symmetry. Based on the group-theoretical approach, the structure of the magnetoelectric tensor in CrI<sub>3</sub> and similar crystals is obtained, suggesting that the transverse magnetoelectric effect is possible along with the longitudinal effect near the spin-flop transition, provided that the magnetic anisotropy decreases to values comparable with the interlayer exchange field. The presence of the transverse magnetoelectric effect is important in the context of detecting electrically induced gyromagnetic effects in van der Waals materials.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"577 - 582"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025600284.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Spatial Correlations of the Impurity Magnetization on the Transition Temperature to the A1-Phase of Superfluid 3He 杂质磁化强度空间相关性对超流体3He向a1相转变温度的影响
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S0021364024605219
V. S. Mikheeva, E. V. Surovtsev
{"title":"Effect of Spatial Correlations of the Impurity Magnetization on the Transition Temperature to the A1-Phase of Superfluid 3He","authors":"V. S. Mikheeva,&nbsp;E. V. Surovtsev","doi":"10.1134/S0021364024605219","DOIUrl":"10.1134/S0021364024605219","url":null,"abstract":"<p>The effect of correlations of magnetic impurities on the superfluid transition temperature to the <span>({{A}_{1}})</span>-phase of superfluid <sup>3</sup>He in an isotropic aerogel has been examined. It has been shown that, in contrast to the pure case and the case of nonmagnetic impurities, the presence of correlations in the magnetization of impurities in the system leads to the emergence of a region where the superfluid transition temperature exhibits a nonlinear dependence on the external magnetic field. It has been found that such anomalous behavior is expected to occur in the region of relatively small magnetic fields. The width of the nonlinear region is determined by the relations between the magnetic correlation length, the coherence length of superfluid <sup>3</sup>He, and the mean free path of quasiparticles in the aerogel. This result significantly differs from the previous result obtained in the mean-field theory, where the nonlinear region is determined by the saturation field of the solid paramagnetic <sup>3</sup>He film coating the aerogel surface. The derived theoretical dependence has been qualitatively compared to recent experimental results on measuring the superfluid transition temperature to the <span>({{A}_{1}})</span>-phase in nematic aerogel.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 7","pages":"545 - 553"},"PeriodicalIF":1.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Subterahertz Acoustic Solitons under Second-Harmonic Generation Conditions 次谐波产生条件下的亚太赫兹声孤子
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-06 DOI: 10.1134/S0021364025600259
S. V. Sazonov
{"title":"Subterahertz Acoustic Solitons under Second-Harmonic Generation Conditions","authors":"S. V. Sazonov","doi":"10.1134/S0021364025600259","DOIUrl":"10.1134/S0021364025600259","url":null,"abstract":"<p>The pulsed regime of second acoustic harmonic generation in the subterahertz range in a paramagnetic crystal has been analytically studied. An exact solution of the corresponding nonlinear wave equations for slowly varying amplitudes as a two-color soliton has been obtained in the absence of phase and group matching and at zero group velocity dispersion parameter at the second harmonic frequency. The soliton has been shown to be formed at a relative proximity of the carrier frequency of the input pulse to the spectral line of the quantum transition between the Zeeman sublevels of impurity paramagnetic ions.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 6","pages":"463 - 468"},"PeriodicalIF":1.4,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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