IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
·
2025
·
IF 8.6
Lilong Zou,Xuan Feng,Hai Liu,Amir M. Alani,Cai Liu
Forests are vital components of the ecosystem of the Earth, regulating climate, conserving soil and water, and fostering biodiversity. Sustainable forest management offers crucial long-term benefits, but challenges such as disease threaten tree health. Disease-infected trees in both forests and urban areas pose risks to safety, property, and culture, leading to economic losses. Traditional inspection methods, such as resistance drilling, are invasive and laborious, while nondestructive techniques such as ground penetrating radar (GPR), offer promising alternatives. Although GPR shows potential, complexities such as tree structure and electromagnetic properties hinder accurate disease detection. In order to address these challenges, a new approach integrates structure-from-motion (SfM) photogrammetry with GPR measurement, and a novel holographic radar tomography processing approach has been proposed in this article. These methodologies accurately reconstruct tree trunks in 3-D, enabling precise GPR positioning and the obtaining of trunk permittivity. An arc-shaped Kirchhoff migration algorithm, moreover, helps mitigate irregular trunk shapes, enhancing data accuracy. The proposed framework demonstrates efficacy in real-tree measurement, offering high-precision disease monitoring. This innovation not only aids in preserving biodiversity but also enhances ecosystem services by promoting sustainable forest management. Effective disease monitoring ensures timely intervention, safeguarding valuable old trees and ecosystems while minimizing economic and cultural losses.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 53
·期 3
·996-1003
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IF 4
Qiang Zhang,Xin Ding,Bin Liu,Yuhua Wang
The development of novel phosphors with excellent luminescence properties for white light-emitting diodes (WLEDs) is always a formidable task. Compared with the traditional laborious and aimless “trial and error” experiments, a mineral-inspired prototype strategy can provide an efficient and accurate method. Herein, for the first time, a novel yellow-emitting phosphor NaBaY2(PO4)3:Eu2+ was discovered using the mineral-inspired prototype strategy and cation substitution method. The phosphor was prepared via the high-temperature solid-state reaction method, and its crystal structure, luminescence properties and potential application for WLEDs were systematically investigated. The NaBaY2(PO4)3 phase was derived from the K2Mg2(SO4)3-type mineral structure and a photoluminescence study revealed that the phosphor can emit bright yellow light with a maximum at 545 nm upon excitation at 351 nm. A WLED lamp was fabricated by the use of a blend of commercial blue-emitting BaMgAl10O17:Eu2+, yellow-emitting NaBaY2(PO4)3:Eu2+ and red-emitting (Ca, Sr)AlSiN3:Eu2+ phosphors with a 380 nm LED chip. The CIE, CCT, Ra and efficiency of the as-fabricated LEDs were measured to be equal to (0.366, 0.365), 4327 K, 91.2 and 40.8 lm W−1, respectively. These results suggest that NaBaY2(PO4)3:Eu2+ could be a promising candidate for n-UV WLEDs.
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高影响因子
LANGMUIR
·
2018
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IF 3.789
Xiangyu Ge,Jinjin Li,Chenhui Zhang,Zhongnan Wang,Jianbin Luo
The robust liquid superlubricity of a room-temperature ionic liquid induced by tribochemical reactions is explored in this study. Here, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM]TFS) could realize stable superlubricity (μ < 0.01) with water at the interfaces of Si3N4/SiO2. A superlow and steady friction coefficient of 0.002–0.004 could be achieved under neutral conditions (pH of 6.9 ± 0.1) after 600 s of running-in process. Various factors that could affect superlubricity were explored, including concentration of [EMIM]TFS, sliding speed, applied load, and volume of the lubricant. The results reveal that superlubricity can be achieved with [EMIM]TFS aqueous solution under a broad scope of conditions. The results of surface analysis show that a steady composite tribochemical layer comprising [EMIM]TFS, silica, ammonia-containing compounds, and sulfides was formed by tribochemical reactions between [EMIM]TFS and Si3N4 during the running-in period. The film thickness calculation reveals that the achieved superlubricity is in a mixed lubrication regime that comprises boundary lubrication and thin film lubrication. The superlubricity state is governed by a firm composite tribochemical layer, a molecular adsorption layer (electric double layer of [EMIM]TFS), and a fluid layer. The liquid superlubricity achieved by the ionic liquid is helpful for the development of new ionic liquids with superlubricity characteristics and is of great significance for scientific understanding as well as engineering applications.
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高影响因子
PHYSICS AND CHEMISTRY OF LIQUIDS
·
2024
·
IF 1.2
Shuting Wang,Xueli Zhou,Qingyuan Song,Yuhuan Chen,Fang Yang
In this work, the densities of CO2-loaded and unloaded alkanolamine (1) + N, N-dimethylacetamide (DMAC) (2) mixtures were determined at temperature of (288.15 to 323.15) K and 101 kPa. The alkanolamines were primary amines, 3-amino-1-propanol (3A1P) and 1-amino-2-propanol (1A2P), and tertiary amine, 3-dimethylamino-1-propanol (3DMA1P). There CO2-unloaded 3A1P/1A2P/3DMA1P + DMAC binary systems with the whole concentration and two CO2-loaded 3A1P/1A2P + DMAC systems with alkanolamine mass fraction of (0.2, 0.3 and 0.4) were investigated. Based on the density values of CO2-unloaded binary systems, the thermal expansion coefficient (αp), excess molar volume (VmE), and apparent molar volume (Vφ,i) were calculated and discussed in terms of intermolecular interactions and spatial structure. The VmE values were positive under the studied conditions and increased with the temperature, and the maximum followed the decreasing order of 1A2P + DMAC > 3DMA1P + DMAC > 3A1P + DMAC. Additionally, the VmE data were well fitted with the Redlich-Kister equation with a small standard deviation (σ ≤ 0.024). For the CO2-loaded systems, the density values were correlated with temperature and concentration using different empirical equations, and the average relative deviations (ARD%) were less than 0.299%.
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FUNCTIONAL & INTEGRATIVE GENOMICS
·
2014
·Vol. 14
·期 3
·603-615
·
IF 2.691
Shi Min,Luo Xiuqin,Ju Guanhua,Yu Xiaohong,Hao Xiaolong,Huang Qiang,Xiao Jianbo,Cui Lijie,Kai Guoyin
Tanshinone is widely used for treatment of cardio-cerebrovascular diseases with increasing demand. Herein, key enzyme genes SmHMGR (3-hydroxy-3-methylglutaryl CoA reductase) and SmDXR (1-deoxy- d -xylulose 5-phosphate reductoisomerase) involved in the tanshinone biosynthetic pathway were introduced into Salvia miltiorrhiza ( Sm ) hairy roots to enhance tanshinone production. Over-expression of SmHMGR or SmDXR in hairy root lines can significantly enhance the yield of tanshinone. Transgenic hairy root lines co-expressing HMGR and DXR (HD lines) produced evidently higher levels of total tanshinone (TT) compared with the control and single gene transformed lines. The highest tanshinone production was observed in HD42 with the concentration of 3.25 mg g −1 DW. Furthermore, the transgenic hairy roots showed higher antioxidant activity than control. In addition, transgenic hairy root harboring HMGR and DXR (HD42) exhibited higher tanshinone content after elicitation by yeast extract and/or Ag + than before. Tanshinone can be significantly enhanced to 5.858, 6.716, and 4.426 mg g −1 DW by YE, Ag + , and YE-Ag + treatment compared with non-induced HD42, respectively. The content of cryptotanshinone and dihydrotanshinone was effectively elevated upon elicitor treatments, whereas there was no obvious promotion effect for the other two compounds tanshinone I and tanshinone IIA. Our results provide a useful strategy to improve tanshinone content as well as other natural active products by combination of genetic engineering with elicitors.
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PubMed
高影响因子
JOURNAL OF MEDICINAL CHEMISTRY
·
2019
·
IF 6.054
Xiaodong Dou,Huixia Huang,Yibo Li,Lan Jiang,Yanxing Wang,Hongwei Jin,Ning Jiao,Lihe Zhang,Liangren Zhang,Zhenming Liu
Alzheimer’s disease (AD) is one of the most challenging diseases around the world with no effective clinical treatment. Previous studies have suggested c-Jun N-terminal kinase 3 (JNK3) as an attractive therapeutic target for AD. Herein, we report 3-substituted indolin-2-one derivatives as the first isoform-selective JNK3 inhibitors by multistage screening. In this study, comparative structure-based virtual screening was performed, and J30-8 was identified with a half-maximal inhibitory concentration of 40 nM, which exhibited over 2500-fold isoform selectivity and marked kinome-wide selectivity. Further study indicated that 1 μM J30-8 exhibited neuroprotective activity in vitro so as to alleviate the spatial memory impairment in vivo through reducing plaque burden and inhibiting the phosphorylation of JNKs, Aβ precursor protein, and Tau protein. All of these indicated J30-8 as proved isoform-selective JNK3 inhibitors that might serve as a useful tool for further JNK3 studies with AD as well as for the development of JNK3 inhibitors for the potential treatment of neurodegenerative diseases.
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PubMed
高影响因子
JOURNAL OF STRUCTURAL CHEMISTRY
·
2026
·Vol. 67
·期 2
·404-414
·
IF 1.5
You Z. L.,Song N. S.,Qiao Z. Y.,Feng X. H.
Aroylhydrazones with various substituent groups and their metal complexes have interesting biological activities. In this work, two new copper(II) complexes [Cu 2 (L a ) 2 ]2NO 3 ∙2MeOH ( 1 ) and [CuL b (CH 3 OH) 2 ]NO 3 ∙CH 3 OH ( 2 ), derived from the aroylhydrazones 4-hydroxy- N’ -(2-hydroxy-5-methylbenzylidene)-3-methoxybenzohydrazide (HL a ) and 4-hydroxy- N’ -(2-hydroxy-3-methoxybenzylidene) benzohydrazide (HL b ), were synthesized and characterized by physico-chemical methods such as elemental analysis and infrared spectroscopy. Structures of the complexes were confirmed by single crystal X-ray determination. The hydrazone ligands in the complexes coordinate to Cu ions through phenolate oxygen, imino nitrogen and carbonyl oxygen atoms. The Cu ions in complex 1 are in square planar coordination, and that in complex 2 is in square pyramidal coordination. Both complexes show good antibacterial activities on the bacterial strains Bacillus subtilis , Staphylococcus aureus and Escherichia coli , while weak activity on the fungal strain Candida albicans and no activity on Aspergillus niger .
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Cheng Xie,Fuyi Sun,Xunke Zhao,Cui Wu,Yuanyuan Che
A transient hot-wire method was used in this work to measure the thermal conductivities of methyl 2-methyl-3-nitrobenzoate (MMN) + acetonitrile, N-bromosuccinimide (NBS) + acetonitrile, and MMN + NBS + acetonitrile in the temperature range of T = (300–340) K. For binary systems, measurements were made for the mass fractions of MMN (ω1) range from 0 to 0.45 and the mass fractions of NBS (ω2) range from 0 to 0.30. For the ternary system, measurements were carried out with the ω1 + ω2 range from 0 to 0.45. The expanded uncertainties of the experimental data were estimated to be 2%, while the confidence level was 0.95 (k = 2). The experimental data were correlated as a function of the mass fraction and temperature using a linear thermal conductivity model. The maximum absolute relative deviation between the experimental values and the calculated results from the fitting model were 0.60, 0.16, and 1.30%.
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高影响因子
ANALYST
·
2015
·Vol. 140
·期 13
·4626-4635
·
IF 4.107
Zian Lin,Ruifang Yu,Wenli Hu,Jiangnan Zheng,Ping Tong,Hongzhi Zhao,Zongwei Cai
Combining free radical polymerization with click chemistry via a copper-mediated azide/alkyne cycloaddition (CuAAC) reaction in a “one-pot” process, a facile approach was developed for the preparation of a poly(3′-azido-3′-deoxythymidine-co-propargyl methacrylate-co-pentaerythritol triacrylate) (AZT-co-PMA-co-PETA) monolithic column. The resulting poly(AZT-co-PMA-co-PETA) monolith showed a relatively homogeneous monolithic structure, good permeability and mechanical stability. Different ratios of monomers and porogens were used for optimizing the properties of a monolithic column. A series of alkylbenzenes, amides, anilines, and benzoic acids were used to evaluate the chromatographic properties of the polymer monolith in terms of hydrophobic, hydrophilic and cation-exchange interactions, and the results showed that the poly(AZT-co-PMA-co-PETA) monolith exhibited more flexible adjustment in chromatographic selectivity than that of the parent poly(PMA-co-PETA) and AZT-modified poly(PMA-co-PETA) monoliths. Column efficiencies for toluene, DMF, and formamide with 35 000–48 000 theoretical plates per m could be obtained at a linear velocity of 0.17 mm s−1. The run-to-run, column-to-column, and batch-to-batch repeatabilities of the retention factors were less than 4.2%. In addition, the proposed monolith was also applied to efficient separation of sulfonamides, nucleobases and nucleosides, anesthetics and proteins for demonstrating its potential.
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高影响因子
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2024
·
IF 0.3
Yu-Pei Xia,Yu-Xin Huang
C 40 H 48 Cu 2 N 12 O 12 , monoclinic, P 2 1 / n (no. 14), a = 10.9519(1) Å, b = 17.4351(2) Å, c = 24.4288(3) Å, β = 102.143(1)°, V = 4560.25(9) Å 3 , Z = 4, R gt ( F ) = 0.0647, w R ref ( F 2 ) = 0.1904, T = 120 K.
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高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Liru Liu,Ping Cheng,Yingxiao Xiao,Sijin Chen,Yiping Zhang,Weizhu Chen,Fengfu Fu,Zhenyu Lin,Yongqiang Dong
(3 S ,3′ S )-astaxanthin ((3 S ,3′ S )-AST) with excellent physiological activity demands accurate chiral-selective detection, yet conventional methods have inherent limitations and SERS technology lacks relevant applications here. In this study, a chiral-selective hydrogel-based SERS chip was prepared by immobilizing aggregated silver nanocages (a-AgNCs) in polyvinyl alcohol (PVA) hydrogel for specific and sensitive (3 S ,3′ S )-AST detection. The hydrogel realized selective adsorption of (3 S ,3′ S )-AST, and a-AgNCs provided strong SERS enhancement via electromagnetic-chemical synergistic effect. The sensing system showed excellent stability (intra/inter-chip RSD < 4.22%, signal loss <5% in 6 weeks), a semi-logarithmic linear response for (3 S ,3′ S )-AST in 0.5–500 ng/g. Practical detection in Haematococcus pluvialis (HP) and Phaffia rhodozyma yeast (PRY) powders confirmed no (3 S ,3′ S )-AST in PRY, and the detected contents in HP samples were consistent with HPLC results. This chip establishes a rapid and reliable chiral-selective detection method for (3 S ,3′ S )-AST, and expands SERS application in chiral analysis of food-related natural products. Hydrogel SERS chips enable direct chiral-selective detection of (3 S ,3′ S )-astaxanthin with high sensitivity and reliable real-sample applicability. Download: Download high-res image (202KB) Download: Download full-size image
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yanbin Tang,Wanting Yang,Yicheng Yu,Yan Xue,Borui Zheng,Junlin Cai,Jinge Hu,Qiming Zeng,Zhenjun Qing,Liming Li
La 2 (WO 4 ) 3 microwave dielectric ceramics were prepared using a conventional solid-state reaction method. The effects of sintering temperature (875–950 °C) on densification, phase evolution, microstructure, and microwave dielectric characteristics were thoroughly examined. Phase-pure monoclinic La 2 (WO 4 ) 3 ceramics with space group C2/c were obtained. Optimum sintering at 925 °C yielded the highest relative density (96.5%) and uniform microstructure, resulting in excellent properties: relative permittivity ( ε r ) of 10.8, quality factor ( Q × f ) of 21,780 GHz, and temperature coefficient of resonant frequency ( τ f ) of −51.1 ppm/°C. Structure-property correlations were clarified by applying the Phillips–Van Vechten–Levine chemical bond theory. Quantitative analysis revealed that the high Q × f is primarily governed by the exceptionally high lattice energy of W–O bonds (average ∼12,307 kJ/mol), which suppresses anharmonic lattice vibrations. The negative τ f correlates with the lower bond energy of La–O bonds (∼420 kJ/mol) compared to W–O bonds (∼578 kJ/mol). A modified atomic packing fraction model demonstrated strong positive correlation with Q × f values, indicating that intrinsic packing efficiency dominates dielectric loss in near-fully dense ceramics. This work establishes quantitative links between microscopic bond characteristics and macroscopic dielectric performance, providing a theoretical foundation for designing temperature-stable tungstate-based materials for co-fired low-temperature ceramic applications.
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