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| 1 | SUPERCONDUCTIVITY ABOVE LIQUID NITROGEN TEMPERATURE IN NEW OXIDE SYSTEMS显示文摘An important discovery of the superconductivity in Ba-La-Cu-O system with transition temperature 30-35 K has been made by Bednorz and Miiller.After that extensive studies in searching for the new series of related superconducting compounds have been well stimu-lated. New systems with even higher transition temperatures have been found one after another. Bulk superconductivity was confirmed in the La2xMxCuO4y system with M=Ba, Sr, Ca and 0.1 | 赵忠贤 陈立泉 杨乾声 黄玉珍 陈赓华 唐汝明 刘贵荣 倪永明 崔长庚 陈烈 王连忠 郭树权 李山林 毕建清 王昌庆 | 1987 | Chinese Science Bulletin1987，32，16： | 8 |
| 2 | Experimental free-space quantum secure direct communication and its security analysis显示文摘We report an experimental implementation of free-space quantum secure direct communication based on single photons.The quantum communication scheme uses phase encoding,and the asymmetric Mach–Zehnder interferometer is optimized so as to automatically compensate phase drift of the photons during their transitions over the free-space medium.At a 16 MHz pulse repetition frequency,an information transmission rate of 500 bps over a 10 m free space with a mean quantum bit error rate of 0.49%±0.27%is achieved.The security is analyzed under the scenario that Eve performs the collective attack for single-photon state and the photon number splitting attack for multi-photon state in the depolarizing channel.Our results show that quantum secure direct communication is feasible in free space. | DONG PAN ZAISHENG LIN JIAWEI WU HAORAN ZHANG ZHEN SUN DONG RUAN LIUGUO YIN AND GUI LU LONG | 2020 | Photonics Research2020，8，9： | 5 |
| 3 | The chromosome-based lavender genome provides new in sights into Lamiaceae evolution and terpenoid biosynthesis显示文摘The aromatic shrub Lavandula angustifolia produces various volatile terpenoids that serve as resources for essential oils and function in plant-insect communication.To better understand the genetic basis of the terpenoid diversity in lavender,we present a high-quality reference genome for the Chinese lavender cultivar‘Jingxun 2'using PacBio and Hi-C technologies to anchor the 894.50 Mb genome assembly into 27 pseudochromosomes.In addition to the y triplication event,lavender underwent two rounds of whole-genome duplication(WGD)during the Eocene-Oligocene(29.6 MYA)and Miocene-Pliocene(6.9 MYA)transitions.As a result of tandem duplications and lineage-specific WGDs,gene families related to terpenoid biosynthesis in lavender are substantially expanded compared to those of five other species in Lamiaceae.Many terpenoid biosynthesis transcripts are abundant in glandular trichomes.We further integrated the contents of ecologically functional terpenoids and coexpressed terpenoid biosynthetic genes to construct terpenoid-gene networks.Typical gene clusters,including TPS-TPS,TPS-CYP450,and TPS-BAHD,linked with compounds that primarily function as attractants or repellents,were identified by their similar patterns of change during flower development or in response to methyl jasmonate.Comprehensive analysis of the genetic basis of the production of volatiles in lavender could serve as a foundation for future research into lavender evolution,phytochemistry,and ecology. | Jingrui Li Yiming Wang Yanmei Dong Wenying Zhang Di Wang Hongtong Bai Kui Li Hui Li Lei Shi | 2021 | Horticulture Research2021，8，1： | 5 |
| 4 | Thermal transport and phase transitions of zirconia by on-the-fly machine-learned interatomic potentials显示文摘Machine-learned interatomic potentials enable realistic finite temperature calculations of complex materials properties with firstprinciples accuracy.It is not yet clear,however,how accurately they describe anharmonic properties,which are crucial for predicting the lattice thermal conductivity and phase transitions in solids and,thus,shape their technological applications.Here we employ a recently developed on-the-fly learning technique based on molecular dynamics and Bayesian inference in order to generate an interatomic potential capable to describe the thermodynamic properties of zirconia,an important transition metal oxide.This machine-learned potential accurately captures the temperature-induced phase transitions below the melting point.We further showcase the predictive power of the potential by calculating the heat transport on the basis of Green–Kubo theory,which allows to account for anharmonic effects to all orders.This study indicates that machine-learned potentials trained on the fly offer a routine solution for accurate and efficient simulations of the thermodynamic properties of a vast class of anharmonic materials. | Carla Verdi Ferenc Karsai Peitao Liu Ryosuke Jinnouchi Georg Kresse | 2021 | npj Computational Materials2021，，1： | 5 |
| 5 | Charged grain boundary transitions in ionic ceramics for energy applications显示文摘Surfaces and interfaces in ionic ceramics play a pivotal role in defining the transport limitations in many of the existing and emerging applications in energy-related systems such as fuel cells,rechargeable batteries,as well as advanced electronics such as those found in semiconducting,ferroelectric,and piezotronic applications.Here,a variational framework has been developed to understand the effects of the intrinsic and extrinsic ionic species and point defects on the structural and electrochemical stability of grain boundaries in polycrystalline ceramics.The theory predicts the conditions for the interfacial electrochemical and structural stability and phase transitions of charged interfaces and quantifies the properties induced by the broad region of electrochemical influence in front of a grain boundary capable of spanning anywhere from a few angtroms to entire grains.We demonstrate the validity of this theory for Y_(x)Zr_(1−x)O_(2−x/2),cubic yttria stabilized zirconia. | K.S.N.Vikrant R.Edwin García | 2019 | npj Computational Materials2019，，1： | 4 |
| 6 | Enhancing prime editing efficiency by modified pegRNA with RNA G-quadruplexes显示文摘Dear Editor,Recent study shows that the prime editing system fusing the Cas9 nickase and reverse transcriptase could perform all types ofgene modifications,including basesubstitutions(transitionsand transversions),small insertions,and deletions,without requiringdonor DNA or double-strand breaks(DSBs)(Anzalone et al.,2019).Despite the accuracy and versatility,the efficiencyof the prime editor(PE)is often insufficient,which limits its broadapplications. | Xiangyang Li Xin Wang Wenjun Sun hisheng Huang Mingtian Zhong Yuan Yao Quanjiang Ji Xingxu Huang | 2022 | Journal of Molecular Cell Biology2022，14，4： | 4 |
| 7 | Time-dependent relativistic density functional study of Yb and YbO显示文摘The low-lying electronic states of Yb and YbO are investigated by using time-dependent relativistic density functional theory,which is based on the newly developed exact two-component Hamiltonian resulting from symmetrized elimination of the small component.The nature of the excited states is analyzed by using the full molecular symmetry.The calculated results support the previous experimental assignment of the ground and excited states of YbO. | XU WenHua ZHANG Yong LIU WenJian | 2009 | Science China Chemistry2009，52，11： | 2 |
| 8 | MULTI-SCALE DUAL-PHASE CYCLIC PLASTICITY WITH QUANTITATIVE TRANSITIONS AND SIZE EFFECTS OF LAYERED STRUCTURES显示文摘A method is developed for cyclic elastoplastic analysis across micro/meso/macro scales whichis effective for the quantitative transition of physical variables and for evaluating the size effects of microstruc-tures.By using the improved self-consistent seheme proposed by Fan and carrying out a delicate mesoscop-ic analysis based on a shear-lag model,the size effects including the thickness of hard and soft layers relativeto the inclusion dimension are obtained on the overall elastoplastic responses of materials up to 50 cycles.The dominant characteristics of the analysis rare that the characteristic dimensions of a microstructure such asthe thickness of the layers and the inclusion dimension can be explicitly incorporated into the formulation.Results of numerical analysis using only 4 plastic constants show that the thicker the layer relative to the in-clusion size,the softer the material in producing more plastic strain values for a given applied stress ampli-tude.This is in agreement with the well-known experimental rule that the yield strength of layered structuresis inversely proportionul to the square root of the spacing between layers.It is found that ratcheting dependsvery much on the size of the layered-structure and that the thinner the relative thickness of the layer the lessthe ratchetiug displacement.This finding may be used to explain why phenomenological models on ratchetingare not quite successful so far,indicating the significance of aeross scale analysis in understanding issueswhich have existed for a long time. | Fan Jinghong Gao Zhihui Zeng Xiangguo | 2002 | Acta Mechanica Solida Sinica2002，15，1： | 2 |
| 9 | Optimal precursors of double-gyre regime transitions with an adjoint-free method显示文摘In this paper, we find the optimal precursors which can cause double-gyre regime transitions based on conditional nonlinear optimal perturbation (CNOP) method with Regional Ocean Modeling System (ROMS). Firstly, we simulate the multiple-equilibria regimes of double-gyre circulation under different viscosity coefficient and obtain the bifurcation diagram, then choose two equilibrium states (called jet-up state and jet-down state) as reference states respectively, propose Principal Component Analysis-based Simulated Annealing (PCASA) algorithm to solve CNOP-type initial perturbations which can induce double-gyre regime transitions between jet-up state and jet-down state. PCASA algorithm is an adjoint-free method which searches optimal solution randomly in the whole solution space. In addition, we investigate CNOP-type initial perturbations how to evolve with time. The results show:(1) the CNOP-type perturbations present a two-cell structure, and gradually evolves into a three-cell structure at predictive time;(2) by superimposing CNOP-type perturbations on the jet-up state and integrating ROMS, double-gyre circulation transfers from jet-up state to jet-down state, and vice versa, and random initial perturbations don't cause the transitions, which means CNOP-type perturbations are the optimal precursors of double-gyre regime transitions;(3) by analyzing the transition process of double-gyre regime transitions, we find that CNOP-type initial perturbations obtain energy from the background state through both barotropic and baroclinic instabilities, and barotropic instability contributes more significantly to the fast-growth of the perturbations. The optimal precursors and the dynamic mechanism of double-gyre regime transitions revealed in this paper have an important significance to enhance the predictability of double-gyre circulation. | YUAN Shijin LI Mi WANG Qiang ZHANG Kun ZHANG Huazhen MU Bin | 2019 | Journal of Oceanology and Limnology2019，37，4： | 1 |
| 10 | Critical Behavior of Spatial Evolutionary Game with Altruistic to Spiteful Preferences on Two-Dimensional Lattices显示文摘Self-questioning mechanism which is similar to single spin-flip of Ising model in statistical physics is introduced into spatial evolutionary game model.We propose a game model with altruistic to spiteful preferences via weighted sums of own and opponent's payoffs.This game model can be transformed into Ising model with an external field.Both interaction between spins and the external field are determined by the elements of payoff matrix and the preference parameter.In the case of perfect rationality at zero social temperature,this game model has three different phases which are entirely cooperative phase,entirely non-cooperative phase and mixed phase.In the investigations of the game model with Monte Carlo simulation,two paths of payoff and preference parameters are taken.In one path,the system undergoes a discontinuous transition from cooperative phase to non-cooperative phase with the change of preference parameter.In another path,two continuous transitions appear one after another when system changes from cooperative phase to non-cooperative phase with the prefenrence parameter.The critical exponents ν,β,and γ of two continuous phase transitions are estimated by the finite-size scaling analysis.Both continuous phase transitions have the same critical exponents and they belong to the same universality class as the two-dimensional Ising model. | 杨波 李晓腾 陈卫 刘剑 陈晓松 | 2016 | Communications in Theoretical Physics2016，65，10： | 1 |
| 11 | Oxygen-vacancy induced magnetic phase transitions in multiferroic thin films显示文摘Multiferroics in which giant ferroelectric polarization and magnetism coexist are of tremendous potential for engineering disruptive applications in information storage and energy conversion.Yet the functional properties of multiferroics are thought to be affected detrimentally by the presence of point defects,which may be abundant due to the volatile nature of some constituent atoms and the high temperatures involved in the synthesis of materials.Here,we demonstrate with theoretical methods that oxygen vacancies may enhance the functionality of multiferroics by radically changing their magnetic interactions in thin films.Specifically,oxygen vacancies may restore missing magnetic super-exchange interactions in large axial ratio phases,leading to full antiferromagnetic spin ordering,and induce the stabilization of ferrimagnetic states with considerable net magnetizations.Our theoretical study should help to clarify the origins of long-standing controversies in bismuth ferrite and improve the design of technological applications based on multiferroics. | César Menéndez Dewei Chu Claudio Cazorla | 2020 | npj Computational Materials2020，，1： | 1 |
| 12 | Random Matrix Theory and Its Application to Decay out of Superdeformed Band显示文摘The study of superdeformed (SD) bands is one of the most active fields of nuclear structure studies at high spin. The SD bands have been observed in many mass regions around A=20, 40, 80, 130, 150, 165, | GU Jian-zhong | 2008 | Annual Report of China Institute of Atomic Energy2008，，1： | 1 |
| 13 | The general transcriptional repressor Tup1 governs filamentous development in Candida tropicalis显示文摘Filamentous development is associated with the ability to cause infections and colonize the host in pathogenic Candida species.Candida tropicalis is one of the major fungal pathogens of humans.The conserved transcriptional repressor Tup1 plays a critical role in the regulation of transcription and filamentation in yeast species.Despite its central role,the full coding sequence of TUP1 has not been found in the reported genome sequence of C.tropicalis to date.In this study,we report the identification of Tup1 and characterize its role in filamentous growth in C.tropicalis.As expected,C.tropicalis Tup1 exhibits general conserved features to the orthologs of other fungi in terms of its structure and function.Deletion of TUP1 in C.tropicalis leads to increased filamentation under several culture conditions.However,Tup1 indeed exhibits species-specific roles in the regulation of filamentous development in C.tropicalis.For example,unlike the tup1/tup1 mutant of Candida albicans,the tup1/tup1 mutant of C.tropicalis is able to exist in the yeast form at low temperatures or in the presence of N-acetylglucosamine(GlcNAc).Acidic pH conditions also favor the yeast form of the tup1/tup1 mutant of C.tropicalis.Quantitative real-time PCR(qRT-PCR)assays indicate that Tup1 may regulate filamentous development through the transcriptional control of key filamentation regulators in C.tropicalis,such as Ume6,Brg1,Wor1,Sfl2,Ahr1,and Zcf3.Taken together,our findings demonstrate both conserved and species-specific roles of Tup1 in the regulation of filamentation and provide novel insights into the biology of C.tropicalis. | Jiao Gong Qian Huang Weihong Liang Yujia Wei Guanghua Huang | 2019 | Acta Biochimica et Biophysica Sinica2019，51，5： | 1 |
| 14 | Probing the upper band gap of atomic rhenium disulfide layers显示文摘Here,we investigate the ultrafast carrier dynamics and electronic states of exfoliated ReS2 films using time-resolved second harmonic generation(TSHG)microscopy and density functional theory(DFT)calculations.The second harmonic generation(SHG)of layers with various thicknesses is probed using a 1.19-eV beam.Up to~13 nm,a gradual increment is observed,followed by a decrease caused by bulk interferometric light absorption.The addition of a pump pulse tuned to the exciton band gap(1.57 eV)creates a decay-to-rise TSHG profile as a function of the probe delay.The power and thickness dependencies indicate that the electron–hole recombination is mediated by defects and surfaces.The two photon absorptions of 2.38 eV in the excited state that are induced by pumping from 1.57 to 1.72 eV are restricted because these transitions highly correlate with the forbidden d–d intrasubshell orbital transitions.However,the combined usage of a frequency-doubled pump(2.38 eV)with wavelength-variant SHG probes(2.60–2.82 eV)allows us to vividly monitor the variations in TSHG profiles from decay-to-rise to rise-to-decay,which imply the existence of an additional electron absorption state(s-orbital)at an approximate distance of 5.05 eV from the highest occupied molecular orbital states.This observation was critically examined by considering the allowance of each electronic transition and a small upper band gap(~0.5 eV)using modified DFT calculations. | Krishna P.Dhakal Hyunmin Kim Seonwoo Lee Youngjae Kim JaeDong Lee Jong-Hyun Ahn | 2018 | Light(Science & Applications)2018，7，1： | 1 |
| 15 | Eigenstate Distribution Fluctuation of a Quenched Disordered Bose–Hubbard System in Thermal-to-Localized Transitions显示文摘We study the thermalization of a quenched disordered Bose–Hubbard system. By considering the eigenstate distribution fluctuation, we show that the thermal to many-body localized transition is always connected to a minimum of this distribution fluctuation. We also observe a Mott-localized regime, where the system fails to thermalize due to the strong on-site repulsion. Lastly, we show how to detect this eigenstate distribution fluctuation in a cold atom system, which is equivalent to measure the Loschmidt echo of the system. Our work suggests a way to measure the thermal-to-localized transitions in experiments, especially for a large system. | 许军军 李彦星 | 2019 | Chinese Physics Letters2019，36，2： | 1 |
| 16 | Forecasting of in situ electron energy loss spectroscopy显示文摘Forecasting models are a central part of many control systems,where high-consequence decisions must be made on long latency control variables.These models are particularly relevant for emerging artificial intelligence(AI)-guided instrumentation,in which prescriptive knowledge is needed to guide autonomous decision-making.Here we describe the implementation of a long short-term memory model(LSTM)for forecasting in situ electron energy loss spectroscopy(EELS)data,one of the richest analytical probes of materials and chemical systems.We describe key considerations for data collection,preprocessing,training,validation,and benchmarking,showing how this approach can yield powerful predictive insight into order-disorder phase transitions.Finally,we comment on how such a model may integrate with emerging AI-guided instrumentation for powerful high-speed experimentation. | Nicholas R.Lewis Yicheng Jin Xiuyu Tang Vidit Shah Christina Doty Bethany E.Matthews Sarah Akers Steven R.Spurgeon | 2022 | npj Computational Materials2022，，1： | 1 |
| 17 | Optical Absorption in SiGe/Si Quantum Well Structures Created by Subband Transitions显示文摘The absorption in Si_(1-x)Ge_(x)/Si multiple quantum-well structures is measured. Several separated well absorption peaks corresponding to both intersubband and intervalence band transitions in the samples are observed. In the normal incidence, two broadband peaks are attributed to intervalence band transitions HH0-SO0(2.5μm),HH_(0)-LH_(0)(~ 3μm), respectively. Using 45° incidence of unpolarized light, both the intervalence band and intersubband transitions are observed. The intervalence band transitions (HH_(0)-LH_(0) ) are Ge composition dependent, but the intersubband transitions, HH_(0)-HH_(1) (5.9μm) and HH_(0)-HH_(2)( 4.3 μm), are not sensitive to the Ge composition. | 杨宇 毛旭 杨红卫 周卫 周桢来 刘焕林 王迅 | 2001 | Chinese Physics Letters2001，18，12： | 1 |
| 18 | EFFECT OF HYDRATION ON THE THERMAL STABILITY OF ENZYME显示文摘The thermal stability of New Zealand culture rabbit muscle aldolase wasinvestigated by differential scanning calorimetry in the water content range0.23-3.70 g water per g protein.The experimental results showed that at watercontents below 0.47g/g,an endothermic peak was observed and at water contentsabove 0.57g/g,an endothermic and an exothermic peak were both observed on DSCthermogram.Thermal denaturation result of the enzyme and the relationshipbetween two transition temperatures and water contents were first reported inthis paper.Up to now we have not seen any similar reports concerning theexothermic transition. | Yun Na LIU Fu TAN Institute of Chemistry,Academia Sinica,Beijing 100080 | 1990 | Chinese Chemical Letters1990，1，3： | 1 |
| 19 | Quantum topology identification with deep neural networks and quantum walks显示文摘Topologically ordered materials may serve as a platform for new quantum technologies,such as fault-tolerant quantum computers.To fulfil this promise,efficient and general methods are needed to discover and classify new topological phases of matter.We demonstrate that deep neural networks augmented with external memory can use the density profiles formed in quantum walks to efficiently identify properties of a topological phase as well as phase transitions.On a trial topological ordered model,our method’s accuracy of topological phase identification reaches 97.4%,and is shown to be robust to noise on the data.Furthermore,we demonstrate that our trained DNN is able to identify topological phases of a perturbed model,and predict the corresponding shift of topological phase transitions without learning any information about the perturbations in advance.These results demonstrate that our approach is generally applicable and may be used to identify a variety of quantum topological materials. | Yurui Ming Chin-Teng Lin Stephen D.Bartlett Wei-Wei Zhang | 2019 | npj Computational Materials2019，，1： | 1 |
| 20 | Mixed symmetry states and isospin excitation in N = Z nucleus ^(52)Fe显示文摘The interacting boson model with isospin (IBM-3) was applied to study the band structure and electromagnetic transition properties of the low-lying states in the even-even N = Z nucleus 52Fe. The isospin excitation states with T = 0, 1 and 2 were identified, and compared with the available data. The study shows that the 2+3 state is the lowest mixed symmetry state in 52Fe. The excitation energy of the second 0+2 state with T = 0 in nucleus 52Fe was identified. The model calculations with the data show a reasonably good agreement. | ZHANG JinFu↑, Lü LiJun, BAI HongBo & LIANG MingZhi Department of Physics, Chifeng University, Chifeng 024001, China | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，12： | 1 |
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