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Science China Earth Sciences 2016年第4期59卷 866-870页

作者： LI le YAO Guang Qing Key Laboratory of Tectonics & Petroleum Resources of the Ministry of Education China University of Geosciences Wuhan 430074 China Faculty of Resources China University ofGeosciences Wuhan 430074 China

Recently, a mechanism of hydrothermal sedimentation about a mantel-derived source was proposed to interpret the formation of lacustrine dolostone in the Cretaceous Xiagou Formation based on systematic petrological, mineralogical, and geochemical analyses （Wen et al., 2013）. Similar to the texture found in classic hydrothermal sediments （Zhang, 1988）, the breccia texture is characterized by certain hydro- thermal sedimentation features. With detailed analysis of the data and relevant explanations, however, we found that their data are not sufficient to support the mantle-derived hydrothermal genetic theory because the formation of ex- tensive laminated micritic ferruginous dolostone is not yet fully understood. We will review the model proposed by Wen et al. （2013） focusing on the following issues.

关键词：湖相白云岩热水沉积青藏高原北部白垩系青西凹陷酒泉盆地热液沉积物地球化学分析

An analytical model for cross-Kerr nonlinearity in a four-level N-type atomic system with Doppler broadening

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Chinese Physics B 2022年第2期31卷 314-319页

作者： Dinh Xuan Khoa Nguyen Huy Bang Nguyen le Thuy An Nguyen Van Phu le Van Doai Vinh University 182 Le Duan StreetVinh CityVietna

We present an analytical model for cross-Kerr nonlinear coefficient in a four-level N-type atomic medium under Doppler *** model is applied to87 Rb atoms to analyze the dependence of the cross-Kerr nonlinear coefficient on the external light field and the temperature of atomic *** analysis shows that in the absence of electromagnetically induced transparency(EIT)the cross-Kerr nonlinear coefficient is zero,but it is significantly enhanced when the EIT is *** means that the cross-Kerr effect can be turned on/off when the external light field is on or ***,the amplitude and the sign of the cross-Kerr nonlinear coefficient are easily changed according to the intensity and frequency of the external light *** amplitude of the cross-Kerr nonlinear coefficient remarkably decreases when the temperature of atomic medium *** analytical model can be convenient to fit experimental observations and applied to photonic devices.

关键词： electromagnetically induced transparency Kerr nonlinear effect Doppler effect

On Problems in the Calculus of Variations in Increasingly Elongated Domains

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Chinese Annals of Mathematics,Series B 2018年第2期39卷 163-182页

作者： Herve le DRET Amira MOKRANE Dedicated to Philippe G. Ciarlet on the occasion of his 80th birthda

This paper deals with minimization problems in the calculus of variations set in a sequence of domains, the size of which tends to infinity in certain directions and such that the data only depend on the coordinates in the directions that remain constant. The authors study the asymptotic behavior of minimizers in various situations and show that they converge in an appropriate sense toward minimizers of a related energy functional in the constant directions.

关键词： Calculus of variations Domains becoming unbounded Asymptotic behaviorExponential rate of convergence

Implication and challenges of direct-fed microbial supplementation to improve ruminant production and health

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Journal of Animal Science and Biotechnology 2022年第2期13卷 316-337页

作者： Yajing Ban le Luo Guan Department of Agricultural Food and Nutritional ScienceUniversity of AlbertaEdmontonAlberta T6G 2P5Canada

Direct-fed microbials(DFMs)are feed additives containing live naturally existing microbes that can benefit animals’health and production *** to the banned or strictly limited prophylactic and growth promoting usage of antibiotics,DFMs have been considered as one of antimicrobial alternatives in livestock *** used as DFMs for ruminants usually consist of bacteria including lactic acid producing bacteria,lactic acid utilizing bacteria and other bacterial groups,and fungi containing Saccharomyces and *** date,the available DFMs for ruminants have been largely based on their effects on improving the feed efficiency and ruminant productivity through enhancing the rumen function such as stabilizing ruminal pH,promoting ruminal fermentation and feed *** research has shown emerging evidence that the DFMs may improve performance and health in young ruminants,however,these positive outcomes were not consistent among studies and the modes of action have not been clearly *** review summarizes the DFM studies conducted in ruminants in the last decade,aiming to provide the new knowledge on DFM supplementation strategies for various ruminant production stages,and to identify what are the potential barriers and challenges for current ruminant industry to adopt the *** literature research indicates that DFMs have the potential to mitigate ruminal acidosis,improve immune response and gut health,increase productivity(growth and milk production),and reduce methane emissions or fecal shedding of *** research is needed to explore the mode of action of specific DFMs in the gut of ruminants,and the optimal supplementation strategies to promote the development and efficiency of DFM products for ruminants.

关键词： DFM-microbial interaction Direct-fed microbials Gut health Host-DFM interaction Ruminants

The use of mineral interfaces in sand-sized volcanic rock fragments to infer mechanical durability

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Journal of Palaeogeography 2020年第3期9卷 288-313页

作者： Emilia le Pera Consuele Morrone Dipartimento di Biologia Ecologia e Scienze della Terra(DiBEST)Universita

The use of mineral interfaces, in sand-sized rock fragments, to infer the influence exerted by mechanical durability on the generation of siliciclastic sediments, has been determined for plutoniclastic sand. Conversely, for volcaniclastic sand, it has received much less attention, and, to our knowledge, this is the first attempt to make use of the volcaniclastic interfacial modal mineralogy of epiclastic sandy fragments, to infer mechanical durability control at a modern beach environment. Volcaniclastic sand was collected along five beaches developed on five islands, of the southern Tyrrhenian Sea(Alicudi, Filicudi, Salina, Panarea and Stromboli) from the Aeolian Archipelago, and one sample was collected near the Stromboli Island volcanic crater. Each sample was sieved and thin sectioned for petrographic analysis. The modal mineralogy of the very coarse, coarse and medium sand fractions was determined by point-counting of the interfacial boundaries discriminating 36 types of interfaces categories, both no-isomineralic and/or no iso-structural(e.g., phenocrystal/glassy groundmass or phenocrystal/microlitic groundmass boundaries) and iso-mineralic interfaces, inside volcanic lithic grains with lathwork and porphyric textures. A total of 47,386 interfacial boundaries have been counted and, the most representative series of interfaces, from the highest to the lowest preservation, can be grouped as: a) ultrastable interfaces, categorized as Pl(Plagioclase)/Glgr(Glassy groundmass) > > Px(Pyroxene)/Glgr > > Ol(Olivine)/Glgr > > Op(Opaque)/Glgr > > Hbl(Hornblende)/Glgr> > Bt(Biotite)/Glgr > > Idd(Iddingsite)/Glgr > > Rt(Rutile)/Glgr;b) stable interfaces, categorized as Pl/Migr(Microlitic groundmass) > > Op/Migr > > Px/Migr > > Ol/Migr;c) moderately stable interfaces, categorized as Op/Px > > Op/Hbl > > Px/P > > Ol/Pl> > Bt/Op;and d) unstable interfaces, categorized as Pl/Pl > > Px/Px > > Ol/Ol > >Op/Op > > Hbl/Hbl > > Bt/Bt. Grains, eroded from the volcanic bedrock, if aff

关键词： Volcaniclastic sand Mineral interfaces Volcanic beach environment Mechanical durability

Electronic physics and possible superconductivity in layered orthorhombic cobalt oxychalcogenides

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Science Bulletin 2017年第8期62卷 563-571页

作者： Congcong le Shengshan Qin Jiangping Hu Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences Beijing 100049 China

We suggest that cobalt-oxychalcogenide layers constructed by vertex sharing CoA_2O_2(A = S, Se, Te) tetrahedra, such as BaCoAO, are strongly correlated multi-orbitals electron systems that can provide important clues on the cause of unconventional superconductivity. Differing from cuprates and iron-based superconductors, these systems lack of the D_(4h) symmetry classification. However, their parental compounds possess antiferromagnetic(AFM) Mott insulating states through pure superexchange interactions and the low energy physics near Fermi surfaces upon doping is mainly attributed to the three t_(2g) orbitals that dominate the AFM interactions. We derive a low energy effective model for these systems and predict that a d-wave-like superconducting state with reasonable high transition temperature can emerge by suppressing the AFM ordering even if the pairing symmetry can not be classified by the rotational symmetry any more.

关键词： Superconductivity Transition metal bichalcogenides High temperature superconductors Anti ferromagnetism

RAID 4SMR:RAID Array with Shingled Magnetic Recording Disk for Mass Storage Systems

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Journal of Computer Science & Technology 2019年第4期34卷 854-868页

作者： Quoc le Ahmed Amer JoAnne Holliday Department of Computer Engineering School of EngineeringSanta Clara UniversitySanta ClaraCA 95053U.S.A.

One way to increase storage density is using a shingled magnetic recording(SMR)*** propose a novel use of SMR disks with RAID(redundant array of independent disks)arrays,specifically building upon and compared with a basic RAID 4 *** proposed scheme(called RAID 4SMR)has the potential to improve the performance of a traditional RAID 4 array with SMR *** evaluation shows that compared with the standard RAID 4,when using update in-place in RAID arrays,RAID 4SMR with garbage collection not just can allow the adoption of SMR disks with a reduced performance penalty,but offers a performance improvement of up to 56%.

关键词： disk array redundant array of independent disks(RAID) shingled magnetic recording(SMR) shingled write

Emotional Vietnamese Speech Synthesis Using Style-Transfer learning

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Computer Systems Science & Engineering 2023年第2期44卷 1263-1278页

作者： Thanh X.le An T.le Quang H.Nguyen School of Information and Communication Technology Hanoi University of Science and TechnologyHanoi10000Vietnam

In recent years,speech synthesis systems have allowed for the produc-tion of very high-quality ***,research in this domain is now turning to the problem of integrating emotions into ***,the method of con-structing a speech synthesizer for each emotion has some ***,this method often requires an emotional-speech data set with many *** data sets are very time-intensive and labor-intensive to ***,training each of these models requires computers with large computational capabilities and a lot of effort and time for model *** addition,each model for each emotion failed to take advantage of data sets of other *** this paper,we propose a new method to synthesize emotional speech in which the latent expressions of emotions are learned from a small data set of professional actors through a Flow-tron *** addition,we provide a new method to build a speech corpus that is scalable and whose quality is easy to ***,to produce a high-quality speech synthesis model,we used this data set to train the Tacotron 2 *** used it as a pre-trained model to train the Flowtron *** applied this method to synthesize Vietnamese speech with sadness and *** opi-nion score(MOS)assessment results show that MOS is 3.61 for sadness and 3.95 for *** conclusion,the proposed method proves to be more effec-tive for a high degree of automation and fast emotional sentence generation,using a small emotional-speech data set.

关键词： Emotional speech synthesis ﬂowtron speech synthesis style transfer vietnamese speech

Detecting Lumbar Implant and Diagnosing Scoliosis from Vietnamese X-Ray Imaging Using the Pre-Trained API Models and Transfer learning

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Computers, Materials & Continua 2021年第1期66卷 17-33页

作者： Chung le Van Vikram Puri Nguyen Thanh Thao Dac-Nhuong le Duy Tan University Da Nang550000Vietnam Department of Radiology Hue University of Medicine and PharmacyHue UniversityHue530000Vietnam Institute of Research and Development Duy Tan UniversityDanang550000Vietnam Faculty of Information Technology Duy Tan UniversityDanang550000Vietnam

With the rapid growth of the autonomous system,deep learning has become integral parts to enumerate applications especially in the case of healthcare *** body vertebrae are the longest and complex parts of the human *** are numerous kinds of conditions such as scoliosis,vertebra degeneration,and vertebrate disc spacing that are related to the human body vertebrae or spine or *** detection of these problems is very important otherwise patients will suffer from a disease for a *** this proposed system,we developed an autonomous system that detects lumbar implants and diagnoses scoliosis from the modified Vietnamese x-ray *** applied two different approaches including pre-trained APIs and transfer learning with their pre-trained models due to the unavailability of sufficient x-ray medical *** results show that transfer learning is suitable for the modified Vietnamese x-ray imaging data as compared to the pre-trained API ***,we also explored and analyzed four transfer learning models and two pre-trained API models with our datasets in terms of accuracy,sensitivity,and specificity.

关键词： Lumbar implant diagnosing scoliosis X-Ray imaging transfer

Answer Extraction Based on Merging Score Strategy of Hot Terms

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Chinese Journal of Electronics 2016年第4期25卷 614-620页

作者： le Juan ZHANG Chunxia NIU Zhendong School of Computer Science and Technology Beijing Institute of Technology School of Software Beijing Institute of Technology Beijing Engineering Research Center of Massive Language Information Processing and Cloud Computing Application Beijing Institute of Technology

Answer extraction(AE) is one of the key technologies in developing the open domain Question & answer(Q&A) *** task is to yield the highest score to the expected answer based on an effective answer score *** introduce an answer extraction method by Merging score strategy(MSS) based on hot *** hot terms are defined according to their lexical and syntactic features to highlight the role of the question *** cope with the syntactic diversities of the corpus,we propose four improved candidate answer score *** of them is based on the lexical function of hot terms and their syntactic relationships with the candidate *** independent corpus score algorithms are proposed to tap the role of the corpus in ranking the candidate *** algorithms are adopted in MSS to tap the complementary action among the corpus,the candidate answers and the *** demonstrate the effectiveness of the proposed strategy.

关键词： Question & answer(Q&A) Answer extraction(AE) Merging score strategy(MSS) Hot terms