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"Yang, Zhilin"
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الفنون الشعبية الصينية
تعد الفنون التشكیلیة التي یقوم بھا الشعب الصیني لتلبیة متطلبات الحیاة الاجتماعیة الشخصیة، وتتجلي تلك الفنون الشعبیة الصینیة في المقصوصات ولوحات رأس السنة الجدیدة والأقنعة والطائرات الورقیة والتشكیل بالعجین وتماثیل الصلصال وغیرھا. ویعمل بتلك الفنون الشعبیة مجموعات كبیرة من العمال العادیین الذین یعیشون بالمناطق الریفیة الواسعة، من ھؤلاء العاملین تتركز في النساء العاملات بالمناطق الریفیة. وتجمع الفنون الشعبیة في طیاتھا بین الحیاة الإنتاجیة وضروریات الحیاة الأساسیة والطقوس البشریة. وینضوي المضمون الثقافي والشكل الفني لتلك الفنون الشعبیة على تراث الثقافة التاریخیة للأمة الصینیة والتي امتدت لسبعة آلاف أو ثمانیة آلاف سنة منذ المجتمع من تلك الثقافة البدائیة التي تقوم على عبادة الطبیعة والطوطم وعبادة الأسلاف وحتي تلك الثقافة الاقتصادیة التجاریة الحدیثة، حیث یمكن القول بأنھا حجر نشاط الثقافة التاریخیة القومیة.
BOOK
Convex radial solutions for Monge-Ampère equations involving the gradient
This paper deals with the existence and multiplicity of convex radial solutions for the Monge-Amp$ \\grave{\\text e} $re equation involving the gradient $ \\nabla u $: $ \\begin{cases} \\det (D^2u) = f(|x|, -u, |\\nabla u|), x\\in B, \\\ u|_{\\partial B} = 0, \\end{cases} $ where $ B: = \\{x\\in \\mathbb R^N: |x| < 1\\} $. The fixed point index theory is employed in the proofs of the main results.
Journal Article
Positive solutions of a second-order nonlinear Robin problem involving the first-order derivative
This paper is concerned with the second-order nonlinear Robin problem involving the first-order derivative: {u″+f(t,u,u′)=0,u(0)=u′(1)−αu(1)=0, where f∈C([0,1]×R+2,R+) and α∈]0,1[. Based on a priori estimates, we use fixed point index theory to establish some results on existence, multiplicity and uniqueness of positive solutions thereof, with the unique positive solution being the limit of of an iterative sequence. The results presented here generalize and extend the corresponding ones for nonlinearities independent of the first-order derivative.
Journal Article
Single-cell, real-time detection of oxidative stress induced in Escherichia coli by the antimicrobial peptide CM15
Antibiotics target specific biochemical mechanisms in bacteria. In response to new drugs, pathogenic bacteria rapidly develop resistance. In contrast, antimicrobial peptides (AMPs) have retained broad spectrum antibacterial potency over millions of years. We present single-cell fluorescence assays that detect reactive oxygen species (ROS) in the Escherichia coli cytoplasm in real time. Within 30 s of permeabilization of the cytoplasmic membrane by the cationic AMP CM15 [combining residues 1–7 of cecropin A (from moth) with residues 2–9 of melittin (bee venom)], three fluorescence signals report oxidative stress in the cytoplasm, apparently involving O ₂⁻, H ₂O ₂, and •OH. Mechanistic studies indicate that active respiration is a prerequisite to the CM15-induced oxidative damage. In anaerobic conditions, signals from ROS are greatly diminished and the minimum inhibitory concentration increases 20-fold. Evidently the natural human AMP LL-37 also induces a burst of ROS. Oxidative stress may prove a significant bacteriostatic mechanism for a variety of cationic AMPs. If so, host organisms may use the local oxygen level to modulate AMP potency.
Significance Antimicrobial peptides (AMPs) help to kill invading bacteria on skin and lung surfaces. We are developing fluorescence microscopy assays that reveal the mechanisms of action of AMPs in real time. It is increasingly clear AMP damage to bacterial cells goes far beyond permeabilization of membranes. Here we demonstrate that for Escherichia coli in aerobic conditions, the peptide CM15 [combining residues 1–7 of cecropin A (from moth) with residues 2–9 of melittin (bee venom)], induces a burst of biochemically harmful reactive oxygen species within 30 s of membrane permeabilization. In anaerobic conditions, CM15 is 20-fold less potent. AMP efficacy in vivo may be tuned to the local level of oxygenation.
Journal Article
Macroscopically uniform interface layer with Li+ conductive channels for high-performance Li metal batteries
The numerous grainboundaries solid electrolyte interface, whether naturally occurring or artificially designed, leads to non-uniform Li metal deposition and consequently results in poor full-battery performance. Herein, a lithium-ion selective transport layer is reported to achieve a highly efficient and dendrite-free lithium metal anode. The layer-by-layer assembled protonated carbon nitride nanosheets present uniform macroscopical structure without grainboundaries. The carbon nitride with ordered pores in basal plane provides high-speed lithium-ion transport channels with low tortuosity. Consequently, the assembled 324 Wh kg
−1
pouch cell exhibits 300 stable cycles with a capacity retention of 90.0% and an average Coulombic efficiency up to 99.7%. The ultra-dense Li metal anode makes current collector-free anode possible, achieving high energy density and long cycle life of a 7 Ah cell (506 Wh kg
−1
, 160 cycles). Thus, it is proved that a macroscopically uniform interface layer with lithium-ion conductive channels could achieve Li metal battery with promising application potential.
Here, authors report a macroscopical grain boundary-free interface layer with microscopic Li + -selective conductive channels enables the ultra-dense Li metal deposition, resulting in a high energy density (506 Wh kg
−
1
) and long cycle life (160 cycles) pouch cell performance.
Journal Article
Effect of Electric Field Gradient on Sub-nanometer Spatial Resolution of Tip-enhanced Raman Spectroscopy
Tip-enhanced Raman spectroscopy (TERS) with sub-nanometer spatial resolution has been recently demonstrated experimentally. However, the physical mechanism underlying is still under discussion. Here we theoretically investigate the electric field gradient of a coupled tip-substrate system. Our calculations suggest that the ultra-high spatial resolution of TERS can be partially attributed to the electric field gradient effect owning to its tighter spatial confinement and sensitivity to the infrared (IR)-active of molecules. Particularly, in the case of TERS of flat-lying H
2
TBPP molecules,we find the electric field gradient enhancement is the dominating factor for the high spatial resolution, which qualitatively coincides with previous experimental report. Our theoretical study offers a new paradigm for understanding the mechanisms of the ultra-high spatial resolution demonstrated in tip-enhanced spectroscopy which is of importance but neglected.
Journal Article
A combined model of ultrasound viscoelasticity and inflammatory indices for differentiating benign and malignant breast lesions
Background
Differentiating breast lesions relies on imaging and pathological biopsy. Ultrasound viscoelastic imaging quantitatively assesses tissue stiffness, while systemic inflammatory parameters reflect the host’s immune status. This study aimed to develop and validate a combined model utilizing both viscoelastic and inflammatory parameters to improve diagnostic accuracy.
Methods
This retrospective study enrolled 184 patients with 205 breast masses. All participants underwent preoperative ultrasound viscoelasticity examination and blood tests. Viscoelastic parameters (Young’s modulus, viscosity) and inflammatory indices (SII, NLR, PLR, LMR) were analyzed. The Least Absolute Shrinkage and Selection Operator (LASSO) regression was used for feature selection, and a multivariate logistic regression model was constructed. Diagnostic performance was evaluated using Receiver Operating Characteristic (ROC) analysis.
Results
Malignant lesions exhibited significantly elevated viscoelastic and inflammatory parameters compared to benign lesions. The combined model demonstrated superior diagnostic performance, with an area under the curve (AUC) of 0.934 (95% CI: 0.90–0.97), sensitivity of 84.78%, and specificity of 89.55%. DeLong’s test confirmed that the AUC of the combined model was significantly higher than that of all single-parameter approaches (all
P
< 0.001), representing an incremental gain of ΔAUC ≈ 0.19 compared to the best single elasticity parameter (EAMax, AUC = 0.740).
Conclusion
The integration of ultrasound viscoelasticity and systemic inflammatory indices represents a promising non-invasive approach for distinguishing benign from malignant breast lesions. This combined model holds potential to optimize clinical decision-making and reduce unnecessary biopsies, pending further validation.
Journal Article
Customer-perceived value and loyalty: how do key service quality dimensions matter in the context of B2C e-commerce?
This paper develops a research model to examine the effect of e-service quality dimensions on customer-perceived value and customer loyalty. Based on a survey of 235 online customers, we identify five key e-service quality dimensions: care, reliability, products portfolio, ease of use, and security. Our empirical results show that all the five dimensions have significant and positive impacts on customer-perceived value which, in turn, increases customer loyalty. We further examine the mediating role of customer-perceived value in the relationship between each e-service quality and customer loyalty. The results suggest that customer-perceived value plays a partially mediating role in the effect of ease of use, care, product portfolio, and reliability on customer loyalty, and a fully mediating role in the relationship between security and customer loyalty. Managers may be in a position to benefit by employing the model presented in this study in an effort to improve service performance and, hence, retain customers.
Journal Article
Measuring consumer perceptions of online shopping convenience
Purpose - The purpose of this paper is to identify the key convenience dimensions of online shopping, as convenience has been one of the principal motivations underlying customer inclinations to adopt online shopping.Design methodology approach - The authors first employ in-depth focus group interviews with online consumers to identify the attributes of online shopping convenience and then develop and validate an instrument of five key dimensions to measure online shopping convenience by analyzing data collected via a Web-based questionnaire survey.Findings - The five dimensions of online shopping convenience are: access, search, evaluation, transaction, and possession post-purchase convenience.Practical implications - Online retailers can employ the five-factor measurement instrument to assess the degree of customer perceived online shopping convenience. This instrument can assist managers in identifying and overcoming key obstacles to the delivery of a highly convenient online shopping service to customers, and also helps them enlarge their loyal customer base.Originality value - This study focuses on uncovering the key dimensions of convenience and their associated sub-dimensions specific to the context of online shopping. Theoretically, the identified dimensions and their related sub-items comprise a validated scale for measuring Web-based service convenience and can serve as building blocks for further studies in e-commerce customer relationship management.
Journal Article
Constructing Artificial SEI Layer on Lithiophilic MXene Surface for High‐Performance Lithium Metal Anodes
MXene has been found as a good host for lithium (Li) metal anodes because of its high specific surface area, lithiophilicity, good stability with lithium, and the in situ formed LiF protective layer. However, the formation of Li dendrites and dead Li is inevitable during long‐term cycle due to the lack of protection at the Li/electrolyte interface. Herein, a stable artificial solid electrolyte interface (SEI) is constructed on the MXene surface by using insulating g‐C3N4 layer to regulate homogeneous Li plating/stripping. The 2D/2D MXene/g‐C3N4 composite nanosheets can not only guarantee sufficient lithiophilic sites, but also protect the Li metal from continuous corrosion by electrolytes. Thus, the Ti3C2Tx/g‐C3N4 electrode enables conformal Li deposition, enhanced average Coulombic efficiency (CE) of 98.4%, and longer cycle lifespan over 400 cycles with an areal capacity of 1.0 mAh cm−2 at 0.5 mA cm−2. Full cells paired with LiFePO4 (LFP) cathode also achieve enhanced rate capacity and cycling stability with higher capacity retention of 85.5% after 320 cycles at 0.5C. The advantages of the 2D/2D lithiophilic layer/artificial SEI layer heterostructures provide important insights into the design strategies for high‐performance and stable Li metal batteries. A stable artificial solid electrolyte interface is constructed on the MXene surface by using insulating g‐C3N4 layer to regulate homogeneous Li plating/stripping. The amorphous g‐C3N4 enables highly uniform artificial SEI and MXene provides sufficient lithiophilic sites for Li nucleation. The obtained Ti3C2Tx/g‐C3N4 composite electrode enables conformal Li deposition, enhanced average Coulombic efficiency, and longer cycle lifespan.
Journal Article