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.
期刊：
Journal of Inverse and Ill-posed Problems,2024年:- ISSN：0928-0219
通讯作者：
Xiang, JL
作者机构：
[Xiang, Jianli; Xiang, JL] China Three Gorges Univ, Coll Sci, Three Gorges Math Res Ctr, Yichang 443002, Peoples R China.;[Yan, Guozheng] Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.;[Yan, Guozheng] Hubei Key Lab Math Phys, Wuhan, Peoples R China.
通讯机构：
[Xiang, JL ] C;China Three Gorges Univ, Coll Sci, Three Gorges Math Res Ctr, Yichang 443002, Peoples R China.
关键词：
Modified linear sampling method;variational method;interior transmission problem;partially coated dielectric
摘要：
Consider time-harmonic electromagnetic wave scattering by an infinitely long, cylindrical, orthotropic dielectric partially coated with a very thin layer of a highly conductive material, which can be modeled by a transmission problem with mixed boundary conditions. Having established the well-posedness of the direct and interior transmission problem by the variational method under certain conditions, we make use of the classical linear sampling method to reconstruct the shape of the obstacle. Then, based on a modification of the general data-to-pattern operator G, we propose a novel and simple method to justify the modified linear sampling method.
期刊：
SIAM JOURNAL ON MATHEMATICAL ANALYSIS,2024年56(2):2149-2170 ISSN：0036-1410
通讯作者：
Zhao, Y
作者机构：
[Li, Peijun] Acad Math & Syst Sci, Chinese Acad Sci, LSEC, ICMSEC, Beijing 100190, Peoples R China.;[Li, Peijun] Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China.;[Zhao, Yue; Yao, Xiaohua; Zhao, Y] Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.;[Zhao, Yue; Yao, Xiaohua; Zhao, Y] Cent China Normal Univ, Key Lab NAA MOE, Wuhan 430079, Peoples R China.
通讯机构：
[Zhao, Y ] C;Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab NAA MOE, Wuhan 430079, Peoples R China.
摘要：
This paper addresses the meromorphic continuation of the outgoing resolvent associated with Schro"\dinger-type operators in three dimensions. The first part focuses on the classical Schro"\dinger-type operator involving unbounded potentials. The absence of nonzero real poles for the outgoing resolvent is investigated. The second part examines the fractional Schro"\dinger operator, including both bounded and unbounded potentials. The analysis relies on a resolvent identity that establishes a connection between the resolvents of the fractional Schro"\dinger operator and its classical counterpart.
摘要：
Linear complementary dual (LCD) codes can provide an optimum linear coding solution for the two-user binary adder channel. LCD codes also can be used to against side-channel attacks and fault non-invasive attacks. Let dLCD(n,k) denote the maximum value of d for which a binary [n,k,d] LCD code exists. In \cite{BS21}, Bouyuklieva conjectured that dLCD(n+1,k)=dLCD(n,k) or dLCD(n,k)+1 for any lenth n and dimension k >= 2. In this paper, we first prove Bouyuklieva's conjecture \cite{BS21} by constructing a binary [n,k,d-1] LCD codes from a binary [n+1,k,d] LCDo,e code, when d >= 3 and k >= 2. Then we provide a distance lower bound for binary LCD codes by expanded codes, and use this bound and some methods such as puncturing, shortening, expanding and extension, we construct some new binary LCD codes. Finally, we improve some previously known values of d(LCD)(n,k) of lengths 38 <= n <= 40 and dimensions 9 <= k <= 15. We also obtain some values of d(LCD)(n,k) with 41 <= n <= 50 and 6 <= k <= n-6.
摘要：
We study a new family of metrics, weighted poset block metric, which generalizes the weighted coordinates poset metric introduced by Panek and Pinheiro (IEEE Trans Inf Theory 66(11):6823–6834, 2020) and the metric for linear error-block codes introduced by Feng et al. (Finite Fields Appl 12(4):638–652, 2006). This metric covers various metrics such as Hamming metric, Lee metric, poset metric, pomset metric, poset block metric, pomset block metric and so on. We give a complete description of the groups of linear isometries of these metric spaces in terms of a semi-direct product. Moreover, we obtain a Singleton type bound for codes equipped with weighted poset block metric and define MDS codes. When the poset is a chain, we study the relationship between MDS codes and perfect codes.
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.
作者机构：
[Zhang, Xian; Zhang, Ruiping] Shanxi Med Univ, Hosp 1, Radiol Dept, Taiyuan 030001, Peoples R China.;[Zhang, Xian; Dou, You; Sun, Yao; Li, Junrong] Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensor Technol &, Natl Key Lab Green Pesticides, Wuhan 430079, Hubei, Peoples R China.;[Liu, Shuang] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China.;[Chen, Peiyao] Hubei Univ Technol, Natl Ctr Cellular Regulat & Mol Pharmaceut 111, Sch Food & Biol Engn, Minist Educ,Hubei Key Lab Ind Microbiol,Key Lab Fe, Wuhan 430068, Peoples R China.;[Wen, Yating] Shanxi Med Univ, Hosp 3, Tongji Shanxi Hosp, Shanxi Acad Med Sci,Shanxi Bethune Hosp, Taiyuan 030001, Peoples R China.
通讯机构：
[Sun, Y ] C;[Zhang, RP ] S;Shanxi Med Univ, Hosp 1, Radiol Dept, Taiyuan 030001, Peoples R China.;Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensor Technol &, Natl Key Lab Green Pesticides, Wuhan 430079, Hubei, Peoples R China.
摘要：
Although being applied as photosensitizers for photodynamic therapy, covalent organic frameworks (COFs) fail the precise fluorescence imaging in vivo and phototherapy in deep-tissue, due to short excitation/emission wavelengths. Herein, this work proposes the first example of NIR-II emissive and benzobisthiadiazole-based COF-980. Comparing to its ligands, the structure of COF-980 can more efficiently reducing the energy gap (Delta ES1-T1) between the excited state and the triplet state to enhance photodynamic therapy efficiency. Importantly, COF-980 demonstrates high photostability, good anti-diffusion property, superior reactive oxygen species (ROS) generation efficiency, promising imaging ability, and ROS production in deep tissue (approximate to 8 mm). Surprisingly, COF-980 combined with laser irradiation could trigger larger amount of intracellular ROS to high efficiently induce cancer cell death. Notably, COF-980 NPs precisely enable PDT guided by NIR-II fluorescence imaging that effectively inhibit the 4T1 tumor growth with negligible adverse effects. This study provides a universal approach to developing long-wavelength emissive COFs and exploits its applications for biomedicine. This pioneering NIR-II emissive COF-980 based on the benzobisthiadiazole scaffold has a series of better performance, demonstrating high photostability, good anti-diffusion property, superior reactive oxygen species generation efficiency, promising imaging ability, and ROS production in deep tissue (approximate to 8 mm), which are highly promising for bioimaging, photodynamic therapy, and other related biomedical fields. image
摘要：
The rice -crayfish field (i.e., RCF), a recently emerged rice cultivation pattern, has experienced remarkable growth in China over the last decade due to its significant socioeconomic advantages. However, the impacts of expanding RCF areas on the regional -scale ecological environment, particularly concerning methane (CH4) emissions, remain unclear. A major obstacle in addressing this knowledge gap is the absence of accurate and upto-date spatial distribution information on RCF across years. Here, we selected Jianghan Plain which has the largest RCF area in China as the study area. First, we developed a phenology-based identification algorithm using Landsat-7/8 satellite data, which considered the distinctive flooding signatures of RCF during the rice fallow periods, to identify RCF at the regional scale. Second, we employed the DeNitrification-DeComposition (DNDC) model to simulate the CH4 fluxes of various rice cropping systems, including RCF, rice monoculture (RM), ricerapeseed rotation (RR), and rice -wheat rotation (RW). Finally, the effects of RCF expansion during 2014-2019 on regional CH4 emissions were analyzed by comparing six scenarios that simulated the conversion of different rice cropping systems to RCF. Results showed the phenology-based algorithm performed well in extracting RCFs, achieving an overall accuracy >92 % for all years based on 1025 RCF and 2096 non-RCF validation samples. RCF generated the least CH4 flux, followed by RM, RR, and RW. Moreover, shifting from traditional rice cropping systems to RCF reduced CH4 emissions across all cases, with mitigation rates ranging from 4.82 % to 21.85 %, indicating RCF's substantial CH4 mitigation potential. These findings significantly improve our understanding of the ecological effects of RCF cultivation, which is critical for advancing land use planning and decision -making for sustainable agricultural development in China. Our presented evaluation method of integrating the remote sensing mapping algorithm and DNDC model can be easily generalized for other crop types in other regions.
作者机构：
[Guan, Rui; Sun, Yao; Li, Junrong; Liu, Guorong] Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensor Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;[Yan, Mingzhe] Huazhong Univ Sci & Technol, Wuhan Jinyintan Hosp, Tongji Med Coll, Wuhan 430023, Peoples R China.;[Cheng, Jing] Wuhan Univ Sci & Technol, Sch Publ Hlth, Wuhan 430072, Peoples R China.;[Zhan, Jianbo] Hubei Prov Ctr Dis Control & Prevent, Inst Hlth Inspect & Testing, Wuhan 430072, Peoples R China.;[Wuethrich, Alain; Trau, Matt; Wuethrich, A] Univ Queensland, Australian Inst Bioengn & Nanotechnol, Ctr Personalized Nanomed, Brisbane, Qld 4072, Australia.
通讯机构：
[Wuethrich, A ] U;[Sun, Y ] C;Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensor Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;Univ Queensland, Australian Inst Bioengn & Nanotechnol, Ctr Personalized Nanomed, Brisbane, Qld 4072, Australia.
摘要：
The molecular detection of multiple respiratory viruses provides evidence for the rational use of drugs and effective health management. Herein, we developed and tested the clinical performance of an electrohydrodynamic-driven nanobox-on-mirror platform (E-NoM) for the parallel, accurate, and sensitive detection of four respiratory viral antigens. The E-NoM platform uses gold-silver alloy nanoboxes as the core material with the deposition of a silver layer as a shell on the core surfaces to amplify and enable a reproducible Raman signal readout that facilitates accurate detection. Additionally, the E-NoM platform employs gold microelectrode arrays as the mirror with electrohydrodynamics to manipulate the fluid flow and enhance molecular interactions for an improved biosensing response. The presence of viral antigens binds the nanobox-based core-shell nanostructure on the gold microelectrode and creates the nanocavity with extremely strong "hot spots" to benefit sensitive analysis. Significantly, in a large clinical cohort with 227 patients, the designed E-NoM platform demonstrates the capability of screening respiratory infection with achieved clinical specificity, sensitivity, and accuracy of 100.0, 96.48, and 96.91%, respectively. It is anticipated that the E-NoM platform can find a position in clinical usage for respiratory disease diagnosis.
期刊：
Journal of Mathematical Analysis and Applications,2024年530(1):127636 ISSN：0022-247X
通讯作者：
Duan, R
作者机构：
[Duan, Ran; Chang, Shengchuang] Cent China Normal Univ, Sch Math & Stat, Hubei Key Lab Math Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Duan, R ] C;Cent China Normal Univ, Sch Math & Stat, Hubei Key Lab Math Sci, Wuhan 430079, Peoples R China.
关键词：
Navier-Stokes-quantum equations;Rayleigh-Taylor instability;Hadamard sense
摘要：
Consider the linear and nonlinear Rayleigh-Taylor instability of the three-dimensional incompressible viscous Navier-Stokes-Quantum equations. For linearized problem, we determine the critical number.cprecisely. Then, we construct a linear growth solution by a modified variational method for k <.k(c). In addition, we show that.cis infinite for a special steady state <(rho)over bar>, which implies that quantum potential inhibit the instability instead of cutting it off. Based on this unstable linear solution and the priori estimates of the smooth solution to the perturbed problem, we establish the nonlinear instability of the density and the velocities in the sense of Hadamard. Compared with the related study on Navier-Stokes-Korteweg equations (Zhang (2022) [41]), we do not ask the capillarity coefficient to be small. (c) 2023 Elsevier Inc. All rights reserved.
关键词：
Compressible Navier-Stokes-Allen-Cahn system;Strong/classical solutions;Density-dependent viscosity;Large initial data
摘要：
This paper is concerned with a one-dimensional isentropic compressible Navier-Stokes-Allen-Cahn system with density-dependent viscosity, which models the motion of a mixture of two viscous compressible fluids. The case when the pressure $ p(\rho) = \rho^\gamma $, the viscosity $ \nu(\rho, \chi) = \rho^\alpha $, the interface thickness $ \delta(\rho) = \rho^\beta $ and the relaxation time function $ a(\rho, \chi, \chi_y) = \rho^\lambda $ is considered, where $ \rho $ and $ \chi $ are the density and the phase variable, respectively, and $ \gamma, \alpha, \beta, \lambda\in\mathbb{R} $ are parameters. Under some suitable assumptions on the parameters $ \gamma , \alpha, \beta, \lambda $ and the initial data, we prove the global existence and large-time behavior of nonvacuum strong and classical solutions to its Cauchy problem with large initial data. This appears to be the first global existence result on the Cauchy problem of the compressible Navier-Stokes-Allen-Cahn system with density-dependent viscosity and large data.
摘要：
This paper focuses on the existence of positive solutions for the following weakly coupled Schrödinger system with supercritical growth except at the origin: $ \begin{equation*} \left\{ \begin{array}{ll} -\Delta u_1 = \mu_1|u_{1}|^{p(r) - 2}u_1 + \beta|u_{2}|^{\frac{p(r)}{2}}|u_1|^{\frac{p(r)}{2}-2}u_{1}, & x\in B_1(0), \\ -\Delta u_2 = \mu_2|u_{2}|^{p(r) - 2}u_{2} + \beta|u_{1}|^{\frac{p(r)}{2}}|u_2|^{\frac{p(r)}{2}-2}u_{2}, & x\in B_1(0), \end{array} \right. \end{equation*} $ where $ B_1(0) $ is an unit ball $ {\mathbb{R}^N} $ with $ N\ge 3 $, $ \beta\in\mathbb{R} $ is a coupling constant, $ \mu_1,\mu_2\in {\mathbb R} $ are constants, $ p(r) = 2^* + r^{\alpha} $ with $ 2^* = \frac{2N}{N-2} $. Assuming that $ 0<{\alpha}<\min\{\frac{N}{2},N-2\} $, we apply concentration-compactness idea to show that the problem has a positive solution provided that $ \beta>0 $ if $ N\ge 5 $ and $ \beta\in(0,\beta_0]\cup[\beta_1,+\infty) $ for some positive constants $ \beta_0<\beta_1 $ if $ N = 3,4 $.
作者机构：
[Huang, Jing] Guangzhou Univ, Sch Math & Informat Sci, Guangzhou, Peoples R China.;[Geng, Xianya] Anhui Univ Sci & Technol, Sch Math & Big Data, Huainan, Peoples R China.;[Zhou, Zihan] Cent China Normal Univ, Fac Math & Stat, Wuhan, Peoples R China.;[Zhou, Zihan] Cent China Normal Univ, Key Lab Nonlinear Anal & Applicat, Minist Educ, Wuhan, Peoples R China.
通讯机构：
[Zhou, ZH ] C;Cent China Normal Univ, Fac Math & Stat, Wuhan, Peoples R China.;Cent China Normal Univ, Key Lab Nonlinear Anal & Applicat, Minist Educ, Wuhan, Peoples R China.
摘要：
Identifying the graph with maximum or minimum spectral radius among a given class of graphs is a central problem in extremal spectral graph theory, known as the Brualdi- Solheid problem. For a graph G = (V-G, E-G), a subset S subset of V-G is called a maximum dissociation set if the induced subgraph G[S] does not contain P-3 as its subgraph, and the subset has maximum cardinality. The dissociation number of G is the number of vertices in a maximum dissociation set of G. In this paper, we first characterize all the connected graphs (resp. bipartite graphs, trees) having maximum spectral radius among connected graphs (resp. bipartite graphs, trees) with given order and dissociation number. Secondly, we show that the connected n-vertex graph with dissociation number phi having minimum spectral radius is a tree, where phi >= [2/3n] . Finally, we determine the graphs having minimum spectral radius with fixed order n and dissociation number phi is an element of {2, [2n/3], n - 1, n - 2}.(c) 2023 Elsevier B.V. All rights reserved.
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.
作者机构：
[Zhao, Qinqin] MianYang Teachers Coll, Deans Off, Mianyang, Peoples R China.;[Wang, Zheng; Bian, Yueran; Zeb, Irum; Zhang, Yan] Huazhong Univ Sci & Technol, Sch Educ, Wuhan, Peoples R China.;[Yang, Caihong] Cent China Normal Univ, Sch Psychol, Wuhan, Peoples R China.;[Chen, Han] MianYang Teachers Coll, President Off, Mianyang, Peoples R China.;[Wang, Pu; Wang, P] Sun Yat Sen Univ, Affiliated Hosp 7, Dept Rehabil Med, Shenzhen, Peoples R China.
通讯机构：
[Wang, P ] S;[Zhang, Y ] H;[Yang, CH ] C;Cent China Normal Univ, Sch Psychol, Wuhan, Peoples R China.;Sun Yat Sen Univ, Affiliated Hosp 7, Dept Rehabil Med, Shenzhen, Peoples R China.
关键词：
anxiety;anxiety without depression;cognitive control network;depression;fNIRS
摘要：
Anxiety is a common psychological disorder associated with other mental disorders, with depression being the most common comorbidity. Few studies have examined the neural mechanisms underlying anxiety after controlling for depression. This study aimed to explore whether there are differences in cortical activation in anxiety patients with different severities whose depression are normal. In the current study, depression levels were normal for 366 subjects-139 healthy subjects, 117 with mild anxiety, and 110 with major anxiety. Using the Hospital Anxiety and Depression Scale (HADS) and a verbal fluency task (VFT) to test subjects' anxiety and depression and cognitive function, respectively. A 53-channel guided near-infrared spectroscopic imaging technology (fNIRS) detected the concentration of oxyhemoglobin (oxy-Hb). Correlation analysis between anxiety severity and oxy-Hb concentration in the brain cortex was performed, as well as ANOVA analysis of oxy-Hb concentration among the three anxiety severity groups. The results showed that anxiety severity was significantly and negatively correlated with oxy-Hb concentrations in the left frontal eye field (lFEF) and in the right dorsolateral prefrontal area (rDLPFC). The oxy-Hb concentration in the lFEF and the rDLPFC were significantly lower in the major anxiety disorder group than that in the control group. This suggests that decreased cortical activity of the lFEF and rDLPFC may be neural markers of anxiety symptoms after controlling for depression. Anxiety symptoms without depression may be result from the dysfunction of the cognitive control network (CCN) which includes the lFEF and rDLPFC. Anxiety disorders often experience an internal sense of loss of control and often be associated with depression. This study aimed to explore the neural mechanisms underlying anxiety after controlling for depress ive symptoms. We found that decreased cortical activity of the lFEF and rDLPFC may be neural markers of anxiety symptoms after control depressive symptoms. Anxiety symptoms without depressive symptoms may be result from the dysfunction of cognitive control network including lFEF and rDLPFC.
摘要：
Infiltration is the process of water entering into, and routings through, the subsurface. It has a profound impact on hillslope and catchment runoff. However, because of the hidden and complex subsurface structures, our understanding of rainfall-related infiltration and how it partitions along a topographic gradient remains challenging. In this study, we used two years of field observations of volumetric soil moisture at 25 combinations of topographic positions and soil depths along a steep subtropical forested hillslope. The lateral partition patterns of infiltration and its control factors were investigated based on a new index, percentage of soil water storage increment at each site to all hillslope sites during a rainfall event (PWSI). Our results showed that the active soil layer involved in hillslope lateral flow was distributed within the depths of 10–40 cm. In deep soil depths (i.e., 40–80 cm), lateral flow was more evident under wet initial moisture conditions than under dry initial moisture conditions, whereas rainfall characteristics had a relatively weak effect on it. Unexpectedly, we found the variability of infiltration partitioning remained high in the deeper soil layers. Among the soil properties, sand, bulk density, n, KS, and SOM were conducive to infiltration, whereas clay had the opposite effect. The dominant factors controlling the lateral partition patterns of infiltration across soil depths were sand in the depths of 0–10 cm, topographic gradient in depths of 10–40 cm, and n (parameter of soil retention curve) in the depths of 40–80 cm. Findings of this study reveal the infiltration partitioning indices were useful to quantitatively describe the distribution patterns of infiltration after rainfall events at the hillslope, and provide new insights into the detection of hillslope lateral flow, which is valuable for understanding subsurface hydrological processes and improving water resource management in humid mountain ecosystems.
期刊：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2024年146(9):6307-6316 ISSN：0002-7863
通讯作者：
Chen, FE;Zhou, H
作者机构：
[Zhao, Fei; Dong, Jianghu; Wang, Wei; Chen, Fen-Er; Yan, Qiongjiao; Xuan, Liangming; Chen, Qinlin; Fan, Rundong; Wang, Haifeng] Wuhan Inst Technol, Pharmaceut Res Inst, Sch Chem Engn & Pharm, Wuhan 430205, Peoples R China.;[Zhou, Hui] Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;[Chen, Fen-Er] Fudan Univ, Engn Ctr Catalysis & Synth Chiral Mol, Dept Chem, Shanghai 200433, Peoples R China.;[Chen, Fen-Er] Shanghai Engn Ctr Ind Catalysis Chiral Drugs, Shanghai 200433, Peoples R China.
通讯机构：
[Zhou, H ] C;[Chen, FE ] W;Wuhan Inst Technol, Pharmaceut Res Inst, Sch Chem Engn & Pharm, Wuhan 430205, Peoples R China.;Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;Fudan Univ, Engn Ctr Catalysis & Synth Chiral Mol, Dept Chem, Shanghai 200433, Peoples R China.
摘要：
Saturated hydrocarbon bonds are ubiquitous in organic molecules; to date, the selective functionalization of C(sp(3))-H bonds continues to pose a notorious difficulty, thereby garnering significant attention from the synthetic chemistry community. During the past several decades, a wide array of powerful new methodologies has been developed to enantioselectively modify C(sp(3))-H bonds that is successfully applied in asymmetric formation of diverse bonds, including C-C, C-N, and C-O bonds; nevertheless, the asymmetric C(sp(3))-H alkylation is elusive and, therefore, far less explored. In this work, we report a direct and robust strategy to construct highly valuable enantioenriched unnatural α-amino acid (α-AA) cognates and peptides by a copper-catalyzed enantioselective remote C(sp(3))-H alkylation of N-fluorocarboxamides and readily accessible glycine esters under ambient conditions. The key to success lies in the optically active Cu catalyst generated through the coordination of glycine derivatives to enantiopure bisphosphine/Cu(I) species, which is beneficial to the single electronic reduction of N-fluorocarboxamides and the subsequent stereodetermining alkylation. More importantly, all types (primary, secondary, tertiary, and even α-oxy) of δ-C(sp(3))-H bonds could be site- and stereospecifically activated by the kinetically favored 1,5-hydrogen atom transfer (1,5-HAT) step.
通讯机构：
[Xue, Q ] C;[Xie, GH ] X;Xiamen Univ, Inst Flexible Elect Future Technol, Xiamen 361005, Peoples R China.;Wuhan Univ, Sauvage Ctr Mol Sci, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.;Cent China Normal Univ, Dept Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a widely used conductive polymer in organic light-emitting devices. However, its strong acidity and fluorescence quenching effect seriously affect the overall device performance. We report a cost-effective method to address the above concerns by diluting PEDOT:PSS with deionized water, which effectively reduced the film thickness and the acidity. Therefore, the fluorescence quenching occurring at the interface was alleviated. Using the modified PEDOT:PSS as the hole injection layer, the external quantum efficiency of the device could be effectively improved by a factor of 81%, reaching a considerably higher value of 23.5%, compared with the device consisting of the original PEDOT:PSS solution used as received. A cost-effective method to address the issues of strong acidity and exciton quenching of PEDOT:PSS was developed by diluting it with deionized water. The solution-processed organic LEDs achieved almost doubled efficiencies with the modified PEDOT:PSS.
作者机构：
[Xu, Ruyi; Chen, Jingying] Cent China Normal Univ, Natl Engn Res Ctr Educ Big Data, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jingying; Han, Jiaxu] Cent China Normal Univ, Natl Engn Res Ctr Elearning, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jingying] Ningbo Yuxing Educ Technol Co Ltd, Ningbo 315200, Zhejiang, Peoples R China.
通讯机构：
[Jingying Chen] N;National Engineering Research Center of Educational Big Data, Central China Normal University, Wuhan, China<&wdkj&>National Engineering Research Center for E-learning, Central China Normal University, Wuhan, China<&wdkj&>Ningbo Yuxing Educational Technology Co., Ltd, Ningbo, China
