期刊：
JOURNAL OF PHYSICAL CHEMISTRY A,2024年 ISSN：1089-5639
作者机构：
[Yang, Minghui; Zhang, Yu; Song, Hongwei; Xia, Min] State Key Laboratory of Magnetic Resonance Spectroscopy and Imaging, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;[Zhang, Yu; Xia, Min] College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China;[Yang, Minghui] Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
摘要：
Calculating the thermal rate constants of elementary combustion reactions is of great importance in theoretical chemistry. Machine learning has become a powerful, data-driven method for predicting rate constants nowadays. Recently, the molecular similarity combined with the topological indices were proposed to represent the hydrogen abstraction reactions of alkane [J. Chem. Inf. Model. 2023, 63, 5097-5106], which are, however, not applicable to alkane cracking reactions, another important class of combustion reactions, due to the cleavage of the C-C bond. In this work, a new feature selection scheme is proposed to describe both bimolecular and unimolecular cracking reactions. Molecular descriptors are elaborately selected individually for both reactants and products from those generated by the open-source software RDKit. Machine learning models combined with these molecular descriptors are proven to have the ability to accurately predict rate constants of both the hydrogen abstraction reactions of alkanes by CH(3) and the alkane cracking reactions. The average deviation of the XGB-FNN model for prediction is around 60% for the hydrogen abstraction reactions of alkanes and 100% for the alkane cracking reactions. It is expected that the descriptors proposed in this work can be applied to build machine learning models for other reactions.
通讯机构：
[Tang, YW ] C;Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
Metal organic framework;Core-shell;Ostwald ripening;Aqueous zinc -ion batteries
摘要：
The nanostructure designing strategy is one of the most effective methods to carry out the optimization of cathode materials for aqueous zinc ion batteries (ARZIBs). The design and synthesis of materials with stable nanostructure and short ion/electron transport paths are expected to alleviate the dilemma faced by vanadiumbased materials, such as poor electrical conductivity and structural changes. Ostwald ripening is a promising option in the design and fabrication of special nanostructures such as hollow and core shells. Selecting vanadiumbased metal-organic frameworks (V-MOF) as reactants, we successfully obtained vanadium oxide precursors with self-growing core-shell structures in one-step. As the reaction time increases, the vanadium oxide precursors undergo the process of microspheres -> core-shell -> yolk shell, which is thought to be the result of Ostwald ripening. After annealing, the vanadium oxide precursor becomes a "core-shell" structure vanadium pentoxide (core-shell V2O5). The ARZIBs assembled with core-shell V2O5 cathodes showed superior capacity (309.4 mAh/g at 0.1 A/g) and cycling stability (91.4 % capacity retention after 4000 cycles at 3A/g). Hence, we successfully realized the self-growth of vanadium oxide with core-shell structure in one step but also revealed the crystallization process based on Ostwald ripening and its zinc storage mechanism, which provides new possibilities for the facile synthesis of special nanostructured ARZIB cathode materials.
作者机构：
[Chunyan Zeng; Shuai Kong; Shixiong Feng; Nan Zhao; Juan Wang] Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Nanli Road 28, 430068, Wuhan, China;[Zhifeng Wang] Department of Digital Media Technology, Central China Normal University, Luoyu Road 152, 430079, Wuhan, China
通讯机构：
[Zhifeng Wang] D;Department of Digital Media Technology, Central China Normal University, Luoyu Road 152, 430079, Wuhan, China
摘要：
The current digital speech deletion and insertion tampering detection methods mainly employes the extraction of phase and frequency features of the Electrical Network Frequency (ENF). However, there are some problems with the existing approaches, such as the alignment problem for speech samples with different durations, the sparsity of ENF features, and the small number of tampered speech samples for training, which lead to low accuracy of deletion and insertion tampering detection. Therefore, this paper proposes a tampering detection method for digital speech deletion and insertion based on ENF Fluctuation Super-vector (ENF-FSV) and deep feature learning representation. By extracting the parameters of ENF phase and frequency fitting curves, feature alignment and dimensionality reduction are achieved, and the alignment and sparsity problems are avoided while the fluctuation information of phase and frequency is extracted. To solve the problem of the insufficient sample size of tampered speech for training, the ENF Universal Background Model (ENF-UBM) is built by a large number of untampered speech samples, and the mean vector is updated to extract ENF-FSV. Considering the shallow representation of ENF features with not highlighting important features, we construct an end-to-end deep neural network to strengthen the attention to the abrupt fluctuation information by the attention mechanism to enhance the representational power of the ENF-FSV features, and then the deep ENF-FSV features extracted by the Residual Network (ResNet) module are fed to the designed classification network for tampering detection. The experimental results show that the method in this paper exhibits higher accuracy and better robustness in the Carioca, New Spanish, and ENF High-sampling Group (ENF-HG) databases when compared with the state-of-the-art methods.
期刊：
ISPRS International Journal of Geo-Information,2024年13(3):82- ISSN：2220-9964
通讯作者：
Lingling Tian
作者机构：
Hubei Institute of Economic and Social Development, Central China Normal University, No. 152 Luoyu Road, Wuhan 430079, China;These authors contributed equally to this work.;College of Urban and Environmental Sciences, Central China Normal University, No. 152 Luoyu Road, Wuhan 430079, China;[Ye Tian] Institute for Advanced Studies in Finance and Economics, Hubei University of Economics, No. 8 Yangqiaohu Road, Wuhan 430205, China;Author to whom correspondence should be addressed.
通讯机构：
[Lingling Tian] C;College of Urban and Environmental Sciences, Central China Normal University, No. 152 Luoyu Road, Wuhan 430079, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Logistics services are integral to urban economic activity, and delving into the spatial distribution traits and evolutionary pathways of various kinds of logistics service node facilities (LSNF) is markedly valuable for understanding a city’s functional spatial makeup and refining the spatial layout of logistics services. This study quantitatively and qualitatively analyzes the spatial congregation and spreading characteristics of diverse LSNFs in Wuhan in 2011, 2014, 2017, and 2020, employing kernel density analysis, average nearest neighbor index, mean center, and distance distribution frequency, seeking to characterize the spatial evolution characteristics of LSNF, alongside examining the trends in distances to city cores, principal adjoining roads, and production and consumption sites. The following conclusions were made: (1) Between 2011 and 2020, various types of LSNFs in Wuhan experienced a pattern characterized by the noticeable coexistence of spatial expansion and agglomeration, particularly visible after 2014. The degree of agglomeration is classified in a descending order as follows: CWC, STN, PSN, and PDN. (2) An “absolute diffusion” phenomenon characterizes the distribution of distances between various kinds of LSNFs and city cores or neighboring roads, with the lion’s share of high-frequency distribution zones spreading beyond city cores by 5–10 km, and a majority of the LSNFs being situated within 1 km from adjacent roads. (3) While the LSNF collective exhibits a stronger tendency towards the consumption facet, it reflects a surrounding of industrial production sites on the production facet and locations of manufactured goods consumption on the consumption facet, followed by locations of agricultural product consumption and comprehensive consumption sites.
期刊：
Journal of Functional Analysis,2024年286(3):110243 ISSN：0022-1236
通讯作者：
Guo, YJ;Li, Y
作者机构：
[Guo, Yujin; Luo, Yong] Cent China Normal Univ, Sch Math & Stat, Minist Educ, POB 71010, Wuhan 430079, Peoples R China.;[Guo, Yujin] Cent China Normal Univ, Key Lab Nonlinear Anal & Applicat, Minist Educ, POB 71010, Wuhan 430079, Peoples R China.;[Li, Yan] Cent China Normal Univ, Sch Math & Stat, POB 71010, Wuhan 430079, Peoples R China.;[Luo, Yong] Cent China Normal Univ, Hubei Key Lab Math Sci, POB 71010, Wuhan 430079, Peoples R China.
通讯机构：
[Li, Y ; Guo, YJ ] C;Cent China Normal Univ, Sch Math & Stat, Minist Educ, POB 71010, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab Nonlinear Anal & Applicat, Minist Educ, POB 71010, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Sch Math & Stat, POB 71010, Wuhan 430079, Peoples R China.
摘要：
This paper is concerned with ground states of attractive Bose gases confined in an anharmonic trap V(x) = omega(vertical bar x vertical bar(2)+ k vertical bar x vertical bar(4)) rotating at the velocity Omega > 0, where omega > 0 denotes the trapping frequency, and k > 0 represents the strength of the quartic term. It is known that for any Omega > 0, ground states exist in such traps if and only if 0 < a < a*, where a*:= parallel to Q parallel to(2)(2) and Q > 0 is the unique positive solution of Delta Q - Q + Q(3)= 0 in R-2. By analyzing the refined energies and expansions of ground states, we prove that there exists a constant C > 0, independent of 0 < a < a*, such that ground states do not have any vortex in the region R(a) := {x is an element of R-2 : vertical bar x vertical bar <= C(a* - a)(-1-6 beta 20)} as a NE arrow a*, for the case where omega= 3 Omega(2)/4, k = 1/6, and Omega = C-0(a*- a)(-beta) varies for some beta is an element of[0, 1/6) and C-0 > 0. (c) 2023 Elsevier Inc. All rights reserved.
作者机构：
[Zhu, Chengzhou; Fang, Qie; Wei, Xiaoqian; Zhu, CZ; Ling, Ling] Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;[Asahi, Toru; Zhao, Yingji; Wei, Xiaoqian] Waseda Univ, Fac Sci & Engn, Tokyo 1698555, Japan.;[Yamauchi, Yusuke; Zhao, Yingji; Wei, Xiaoqian] Nagoya Univ, Grad Sch Engn, Dept Mat Proc Engn, Nagoya, Aichi 4648603, Japan.;[Song, Weiyu; Song, Shaojia] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China.;[Cai, Weiwei] China Univ Geosci, Fac Mat Sci & Chem, Energy Lab, Wuhan 430074, Peoples R China.
通讯机构：
[Yamauchi, Y ] N;[Zhu, CZ ] C;Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;Nagoya Univ, Grad Sch Engn, Dept Mat Proc Engn, Nagoya, Aichi 4648603, Japan.;Univ Queensland, Australian Inst Bioengn & Nanotechnol AIBN, Brisbane, Qld 4072, Australia.
关键词：
Mn single atoms;Pt nanoparticles;atomic pairs;oxygen reduction reactions;synergistic effects
摘要：
The intrinsic roadblocks for designing promising Pt-based oxygen reduction reaction (ORR) catalysts emanate from the strong scaling relationship and activity-stability-cost trade-offs. Here, a carbon-supported Pt nanoparticle and a Mn single atom (Pt(NP)-Mn(SA)/C) as in situ constructed Pt(NP)-Mn(SA) pairs are demonstrated to be an efficient catalyst to circumvent the above seesaws with only ∼4 wt % Pt loadings. Experimental and theoretical investigations suggest that Mn(SA) functions not only as the "assist" for Pt sites to cooperatively facilitate the dissociation of O(2) due to the strong electronic polarization, affording the dissociative pathway with reduced H(2)O(2) production, but also as an electronic structure "modulator" to downshift the d-band center of Pt sites, alleviating the overbinding of oxygen-containing intermediates. More importantly, Mn(SA) also serves as a "stabilizer" to endow Pt(NP)-Mn(SA)/C with excellent structural stability and low Fenton-like reactivity, resisting the fast demetalation of metal sites. As a result, Pt(NPs)-Mn(SA)/C shows promising ORR performance with a half-wave potential of 0.93 V vs reversible hydrogen electrode and a high mass activity of 1.77 A/mg(Pt) at 0.9 V in acid media, which is 19 times higher than that of commercial Pt/C and only declines by 5% after 80,000 potential cycles. Specifically, Pt(NPs)-Mn(SA)/C reaches a power density of 1214 mW/cm(2) at 2.87 A/cm(2) in an H(2)-O(2) fuel cell.
作者机构：
[Zhou, Zihan; Li, Shuchao] Cent China Normal Univ, Fac Math & Stat, Wuhan 430079, Peoples R China.;[Zhou, Zihan; Li, Shuchao] Cent China Normal Univ, Key Lab Nonlinear Anal & Applicat, Minist Educ, Wuhan 430079, Peoples R China.;[Sun, Wanting] Shandong Univ, Data Sci Inst, Jinan 250100, Peoples R China.;[Wei, Wei] Shanghai Univ Engn Sci, Ctr Intelligent Comp & Appl Stat, Sch Math Phys & Stat, Shanghai 201620, Peoples R China.;[Zhang, Minjie; Zhang, MJ] Hubei Univ Arts & Sci, Sch Math & Stat, Xiangyang 441053, Peoples R China.
通讯机构：
[Zhang, MJ ] H;Hubei Univ Arts & Sci, Sch Math & Stat, Xiangyang 441053, Peoples R China.
关键词：
Signed mixed graph;Eisenstein matrix;Spectral radius
摘要：
A mixed graph M-G is obtained from a simple graph G by orienting an edge subset of G. A signed mixed graph is a mixed graph with arcs and edges signed + or -. The unit Eisenstein matrix (epsilon-matrix for short) of a signed mixed graph was recently introduced by Wissing and van Dam [32]. This novel matrix is indexed by the vertices of the signed mixed graph, and the entry corresponding to a positive arc from u to v is equal to omega = 1+i root 3/2 (and its symmetric entry is (omega) over bar = 1-i root 3/2); the entry corresponding to a negative arc is equal to -omega (and its symmetric entry is -(omega) over bar); the entry corresponding to a positive edge is equal to 1; the entry corresponding to a negative edge is equal to -1; and 0 otherwise. In this paper, we study the spectral properties of this epsilon-matrix. We characterize all the signed mixed graphs whose eigenvalues are contained in (-alpha, alpha) for alpha is an element of {root 2, root 3, root 2} .(c) 2023 Elsevier B.V. All rights reserved.
期刊：
British Journal of Educational Technology,2024年 ISSN：0007-1013
通讯作者：
Ba, S;Hu, X
作者机构：
[Ba, Shen] Educ Univ Hong Kong, Dept Curriculum & Instruct, Hong Kong, Peoples R China.;[Hu, Xiao] Univ Hong Kong, Fac Educ, Hong Kong, Peoples R China.;[Stein, David] Ohio State Univ, Coll Educ & Human Ecol, Columbus, OH USA.;[Liu, Qingtang] Cent China Normal Univ, Sch Educ Informat Technol, Wuhan, Peoples R China.;[Ba, Shen; Ba, S] Educ Univ Hong Kong, Dept Curriculum & Instruct, Tai Po, 10 Lo Ping Rd, Hong Kong, Peoples R China.
通讯机构：
[Ba, S ] E;[Hu, X ] U;Educ Univ Hong Kong, Dept Curriculum & Instruct, Tai Po, 10 Lo Ping Rd, Hong Kong, Peoples R China.;Univ Hong Kong, Fac Educ, Pokfulam, Room 209, Runme Shaw Bldg, Hong Kong, Peoples R China.
关键词：
community of inquiry;epistemic network analysis;learning analytics;online discussion;trajectory tracking
摘要：
Abstract Accurate assessment and effective feedback are crucial for cultivating learners' abilities of collaborative problem‐solving and critical thinking in online inquiry‐based discussions. Based on quantitative content analysis (QCA), there has been a methodological evolvement from descriptive statistics to sequential mining and to network analysis for mining coded discourse data. Epistemic network analysis (ENA) has recently gained increasing recognition for modelling and visualizing the temporal characteristics of online discussions. However, due to methodological restraints, some valuable information regarding online discussion dynamics remains unexplained, including the directionality of connections between theoretical indicators and the trajectory of thinking development. Guided by the community of inquiry (CoI) model, this study extended generic ENA by incorporating directional connections and stanza‐based trajectory tracking. By examining the proposed extensions with discussion data of an online learning course, this study first verified that the extensions are comparable with QCA, indicating acceptable assessment validity. Then, the directional ENA revealed that two‐way connections between CoI indicators could vary over time and across groups, reflecting different discussion strategies. Furthermore, trajectory tracking effectively detected and visualized the fine‐grained progression of thinking. At the end, we summarize several research and practical implications of the ENA extensions for assessing the learning process.Practitioner notesWhat is already known about this topic Assessment and feedback are crucial for cultivating collaborative problem‐solving and critical thinking in online inquiry‐based discussions. Cognitive presence is an important construct describing the progression of thinking in online inquiry‐based discussions. Epistemic network analysis is gaining increasing recognition for modelling the temporal characteristics of online inquiries. What this paper adds Directional connections between discourses can reflect different online discussion strategies of groups and individuals. A pair of connected discourses coded with the community of inquiry model can have different meanings depending on their temporal order. A trajectory tracking approach can uncover the fine‐grained progression of thinking in online inquiry‐based discussions. Implications for practice and/or policy Besides the occurrences of individual discourses, examining the meanings of directional co‐occurrences of discourses in online discussions is worthwhile. Groups and individuals can employ different discussion strategies and follow diverse paths to thought development. Developmental assessment is crucial for understanding how participants achieve specific outcomes and providing adaptive feedback.
作者机构：
[Li, Yong; Lou, Ruitao] Hohai Univ, Coll Environm, Key Lab Integrated Regulat & Resource Dev Shallow, Minist Educ, Nanjing, Jiangsu, Peoples R China.;[Jiang, Qianjing; Lou, Ruitao; He, Yong; Wu, Qingguan] Zhejiang Univ, Biosyst Engn, Hangzhou, Zhejiang, Peoples R China.;[Li, Yong] Hohai Univ, Natl Engn Res Ctr Water Resources Efficient Utiliz, Nanjing, Jiangsu, Peoples R China.;[Liu, Ying] Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling, Peoples R China.;[Liu, Ji] Cent China Normal Univ, Hubei Prov Key Lab Geog Proc Anal & Simulat, Wuhan, Peoples R China.
通讯机构：
[Jiang, QJ ] Z;[Li, Y ] H;Hohai Univ, Coll Environm, Key Lab Integrated Regulat & Resource Dev Shallow, Minist Educ, Nanjing, Jiangsu, Peoples R China.;Zhejiang Univ, Biosyst Engn, Hangzhou, Zhejiang, Peoples R China.
关键词：
Green manure;Greenhouse gas;Methane;Nitrous oxide;Global warming potential intensity
摘要：
Green manure is a widely applied to increase grain yield, while it also attributes to greenhouse gas (GHG) emissions in agriculture ecosystems. Combining green manure with inorganic fertilizer inputs is a common practice that can influence soil GHG emissions and grain yield, however, its impacts on grain yield and global warming potential (GWP) under different initial soil conditions before rotating experiments and agronomic management in paddy fields remain unclear. We synthesized 508 data pairs to evaluate the responses of CO2 emissions, CH4 emissions, N2O emissions, and grain yield to combined inputs of green manure plus inorganic fertilizer compared with only inorganic fertilizer application. Our findings indicate that both inorganic fertilizer plus extra green manure (GM-E) and green manure substitutes for inorganic fertilizer (GM-S) could increase CO2 emissions (22.5 %-76.8 %), CH4 emissions (100 %-103 %), N2O emissions (29.8 %-50.9 %), and yield (2.21 %-19.6 %). Except for GM-E, which showed a non-significant increase in grain yield. The initial soil properties before rotating experiments, the types and timing of green manure application were key drivers of GHG emissions and yield, and extra green manure applied in areas with low initial soil pH and high C:N can increase GWP and yield. Overall, the mixed green manure application had greater impact than leguminous or non-leguminous green manure applied alone. The responses of GHG emissions and yield to GM-S were modulated by mean annual precipitation and initial soil properties before rotating experiments, and green manure substitutes for inorganic fertilizer in areas with high initial soil pH and low C:N can increase GWP and yield. Meanwhile, excessive precipitation caused a reduction in yield and a significant increase in GWP intensity. Our results showed that extra green manure applications of less than 68.1 kg N ha-1 would not significantly increase GWP. Therefore, an effective green manure strategy can achieve a win-win situation for the dual challenge of agricultural production and climate change mitigation.
作者机构：
[Wen-Long Sang; Tao Wang] School of Physical Science and Technology, Southwest University, Chongqing 400700, China;[Yu-Dong Zhang] Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan, Hubei 430079, China;China University of Mining and Technology, Beijing 100083, China;Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;[Feng Feng] China University of Mining and Technology, Beijing 100083, China<&wdkj&>Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
摘要：
In this study, we compute the electromagnetic and hadronic decay widths of the S-wave fully heavy tetraquark T4Q ( Q=c or b ) at lowest order in αs and v , in the framework of nonrelativistic QCD. The short-distance coefficients are determined through the standard procedure of matching. The nonperturbative long-distance matrix elements are related to the phenomenological four-body Schrödinger wave functions at the origin, whose values are taken from literature. The branching fractions are predicted to be around 10−3 and 10−6 for the T4c hadronic decay and electromagnetic decay, respectively. Combining our results with the T4c production cross sections at the LHC, we also predict the event numbers for various decay channels. With integrated luminosity L=100 fb−1 , it is expected that the event numbers can reach 103–104 for T4c→γγ , and 105–106 for T4c→LH , at the LHC. The detecting prospect is promising. In addition, the decay widths of T4b are estimated based on simple dimensional analysis as well as velocity scaling rule.
作者机构：
[Wang, Dong; Wang, D; Cao, Dandan] Cent China Normal Univ, Sch Life Sci, Wuhan 430079, Hubei, Peoples R China.;[Yang, Yongqing] Chongqing Normal Univ, Coll Life Sci, Chongqing 401331, Peoples R China.;[Wang, Dong; Wang, D] Shaanxi Univ Technol, Bioresources Key Lab Shaanxi Prov, Hanzhong 723001, Shaanxi, Peoples R China.
通讯机构：
[Wang, D ] C;Cent China Normal Univ, Sch Life Sci, Wuhan 430079, Hubei, Peoples R China.;Shaanxi Univ Technol, Bioresources Key Lab Shaanxi Prov, Hanzhong 723001, Shaanxi, Peoples R China.
摘要：
Invasive plants have been shown to alter ecosystem functions. However, there is limited information available on the effect of the invasive species litter input on native litter decomposition and home-field advantage (HFA, increased decomposition at a home environment compared to a guest environment). To investigate this, we conducted a field experiment using leaves of native Trapa natans and Typha orientalis with and without invasive species Alternanthera philoxeroides and then incubated them at T. natans and T. orientalis habitats in a eutrophic lake for 50 days. In control and treatment, the decomposition and N release rate of T. natans were significantly higher than that in T. orientalis species litter at two habitats, indicating no HFA occurrence. A. philoxeroides litter input promoted the decomposition and N decay rate of T. orientalis, not T. natans. The mean decomposition rate of T. orientalis in control and treatment were 0.0138 and 0.0342 day-1; for T. natans, it was 0.0703 and 0.0754 day-1, respectively. The mean N decay rate of T. orientalis in control and treatment were 0.0235 and 0.0468 day-1; for T. natans, it was 0.0511 and 0.0544 day-1, respectively. Invasive species presence increased microbial respiration rate of T. orientalis, but not for T. natans species litter in two habitats. These results suggested that A. philoxeroides litter input accelerated low quality litter decomposition though increased microbial activity. However, it did not influence the HFA performance, which may be closely related to the lake eutrophication.
关键词：
Energy splitting of STAR-RIS;time switching of STAR-RIS;UAV-enabled outdoor-to-indoor WPCN;indoor NFZ
摘要：
This letter investigates a Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface (STAR-RIS)-assisted unmanned aerial vehicle (UAV)-enabled outdoor-to-indoor (O2I) wireless powered communication network (WPCN), in which the UAV avoids flying over the indoor no-fly zone (NFZ). In the downlink energy transfer (DET) stage, the energy-constrained STAR-RIS and the O2I Internet of Things (IoT) devices harvest energy from the radio frequency (RF) signals of the UAV to self-sustain its operation. In the uplink information transmission (UIT) stage, the IoT devices transmit information to the UAV using the harvested energy, assisted by the STAR-RIS. We introduce the STAR-RIS energy splitting (ES) and time switching (TS) operating protocols in the DET and UIT stages, respectively, to maximize the harvested downlink energy and the achievable uplink sum-rate. Further, an alternating optimization (AO) algorithm based on the penalty method and successive convex approximation (SCA) technology is proposed to solve the resulting highly-coupled non-convex optimization problems, in which the UAV trajectory based on the UAV power consumption model, resource allocation of the O2I IoT devices, and beamforming vectors of the STAR-RIS are jointly optimized. Finally, numerical results demonstrate that our proposed scheme can achieve significant system sum-rate gains that are better than other baseline schemes.
作者：
Tao Huang;Xinjia Ou;Huali Yang*;Shengze Hu;Jing Geng;...
期刊：
Expert Systems with Applications,2024年248:123419 ISSN：0957-4174
通讯作者：
Huali Yang
作者机构：
[Zongkai Yang] National Engineering Research Center of Educational Big Data, Central China Normal University, Wuhan, 430079, China;[Huali Yang] School of Computer Science and Artificial Intelligence, Wuhan Textile University, Wuhan, 430200, China;Ningxia normal University, Ningxia, 756000, China;Faculty of Artificial Intelligence in Education, Central China Normal University, Wuhan, 430079, China;[Tao Huang] National Engineering Research Center of Educational Big Data, Central China Normal University, Wuhan, 430079, China<&wdkj&>Ningxia normal University, Ningxia, 756000, China<&wdkj&>Faculty of Artificial Intelligence in Education, Central China Normal University, Wuhan, 430079, China
通讯机构：
[Huali Yang] S;School of Computer Science and Artificial Intelligence, Wuhan Textile University, Wuhan, 430200, China
摘要：
Educators dynamically adjust their teaching strategies by tracing the development of students’ knowledge states. Knowledge Tracing (KT) plays a role similar to that of educators in online teaching. By analyzing past performances, KT identifies learners’ knowledge states and predicts the outcomes of future exercises. However, the existing KT models assume that the learner’s performance is a binary variable (i.e., correct or incorrect) without refining learner performance or differentiating knowledge states. Multiple-choice tests employ distractors that engage learners in different knowledge states, with each distraction implying a specific error. In multiple-choice exercises, we propose an option-weighting-enhanced mixture-of-expert knowledge tracing (WEKT) method that assigns weights to different options based on improved option weighting scoring. The option weights affirm partial knowledge and refine the knowledge state. Building on the multi-task learning strategy, we design a mixture-of-experts framework that simultaneously predicts correctness and options, traces students’ specific errors, and refines students’ performances. The expert structure combines cognitive theory with deep learning technology, taking into consideration the differences between experts and students. Extensive experiments on large-scale datasets indicate that WEKT can refine knowledge states and attain more precise predictions of student performance.
摘要：
Upland cotton, the mainly cultivated cotton species in the world, provides over 90% of natural raw materials (fibers) for the textile industry. The development of cotton fibers that are unicellular and highly elongated trichomes on seeds is a delicate and complex process. However, the regulatory mechanism of fiber development is still largely unclear in detail. In this study, we report that a homeodomain-leucine zipper (HD-ZIP) IV transcription factor, GhHOX4, plays an important role in fiber elongation. Overexpression of GhHOX4 in cotton resulted in longer fibers, while GhHOX4-silenced transgenic cotton displayed a "shorter fiber" phenotype compared with wild type. GhHOX4 directly activates two target genes, GhEXLB1D and GhXTH2D, for promoting fiber elongation. On the other hand, phosphatidic acid (PA), which is associated with cell signaling and metabolism, interacts with GhHOX4 to hinder fiber elongation. The basic amino acids KR-R-R in START domain of GhHOX4 protein are essential for its binding to PA that could alter the nuclear localization of GhHOX4 protein, thereby suppressing the transcriptional regulation of GhHOX4 to downstream genes in the transition from fiber elongation to secondary cell wall (SCW) thickening during fiber development. Thus, our data revealed that GhHOX4 positively regulates fiber elongation, while PA may function in the phase transition from fiber elongation to SCW formation by negatively modulating GhHOX4 in cotton.
作者：
Acharya, S.;Adamova, D.;Adler, A.;Rinella, G. Aglieri;Agnello, M.;...
期刊：
Physics Letters B,2024年848 ISSN：0370-2693
通讯作者：
Acharya, S
作者机构：
[Bastid, N.; Manso, F.; Porteboeuf-Houssais, S.; Acharya, S; Acharya, S.; Crochet, P.; Barret, V.; Lopez, X.; Dupieux, P.] Univ Clermont Auvergne, LPC, CNRS, IN2P3, Clermont Ferrand, France.;[Grigoryan, S.] Yerevan Phys Inst Fdn, AI Alikhanyan Natl Sci Lab, Yerevan, Armenia.;[Koryciak, S. D.; Lelek, T. M.; Kitowski, J. P.; Gorgon, M.; Horzyk, A.; Jablonski, M.; Marcjan, R. W.; Balis, B.; Russek, P. G.] AGH Univ Krakow, Krakow, Poland.;[Trubnikov, V.] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine.;[Modak, A.] Bose Inst, Dept Phys, Kolkata, India.
通讯机构：
[Acharya, S ] U;Univ Clermont Auvergne, LPC, CNRS, IN2P3, Clermont Ferrand, France.
摘要：
In this Letter, the first measurement of the inelastic cross section for antitriton-nucleus interactions is reported, covering the momentum range of 0.8 <= < 2.4 GeV/c. The measurement is carried out using data recorded with the ALICE detector in pp and Pb-Pb collisions at a centre-of-mass energy per nucleon of 13 TeV and 5.02 TeV, respectively. The detector material serves as an absorber for antitriton nuclei. The raw yield of (anti)triton nuclei measured with the ALICE apparatus is compared to the results from detailed ALICE simulations based on the GEANT4 toolkit for the propagation of (anti)particles through matter, allowing one to quantify the inelastic interaction probability in the detector material. This analysis complements the measurement of the inelastic cross section of antinuclei up to = 3 carried out by the ALICE Collaboration, and demonstrates the feasibility of the study of the isospin dependence of inelastic interaction cross section with the analysis techniques presented in this Letter.
作者机构：
[Wenju Gu; Lei Chen; Zhen Yi; Sujing Liu] School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China;[Gao-xiang Li] Department of Physics, Huazhong Normal University, Wuhan 430079, China
摘要：
We investigate the scattering processes of two photons in a one-dimensional waveguide coupled to two giant atoms. By adjusting the accumulated phase shifts between the coupling points, we are able to effectively manipulate the characteristics of these scattering photons. Utilizing the Lippmann-Schwinger formalism, we derive analytical expressions for the wave functions describing two-photon interaction in separate, braided, and nested configurations. Based on these wave functions, we also obtain analytical expressions for the incoherent power spectra and second-order correlation functions. In contrast to small atoms, the incoherent spectrum, which is defined by the correlation of the bound state, can exhibit more tunability due to the phase shifts. Additionally, the second-order correlation functions in the transmission and reflection fields could be tuned to exhibit either bunching or antibunching upon resonant driving. These unique features offered by the giant atoms in waveguide QED could benefit the generation of nonclassical itinerant photons in quantum networks.
摘要：
Engineering isolated metal sites resembling the primary coordination sphere of metallocofactors enables atomically dispersed materials as promising nanozymes. However, most existing nanozymes primarily focus on replicating specific metallocofactors while neglecting other supporting cofactors within active pockets, leading to reduced electron transfer (ET) efficiency and thus inferior catalytic performances. Herein, we report a metal–organic framework UiO-67 nanozyme with atomically dispersed iron sites, which involves multiple tailored enzyme-like nanocofactors that synergistically drive the ET process for enhanced peroxidase-like catalysis. Among them, the linker-coupled atomic iron site plays a critical role in substrate activation, while bare linkers and zirconia nodes facilitate the ET efficiency of intermediates. The synergy of three nanocofactors results in a 4.29-fold enhancement compared with the single effort of isolated metal site-based nanocofactor, holding promise in immunoassay for sensitive detection of chlorpyrifos. This finding opens a new way for designing high-performance nanozymes by harmonizing various nanocofactors at the atomic and molecular scale.
