المؤلفون: Yufeng Li, Jinsong Wang, Qiao-Hui Zeng, Langhong Wang, Jing Jing Wang, Shaojie Li, Jiahui Zhu, Xin-An Zeng

المصدر: Ultrasonics Sonochemistry, Vol 107, Iss , Pp 106931- (2024)

مصطلحات موضوعية: Shrimp, Ultrasound, Slightly basic electrolyzed water, Thawing, Chemistry, QD1-999, Acoustics. Sound, QC221-246

الوصف: Thawing is the primary step in handling frozen aquatic products, which directly determines their end-product quality. This study firstly constructed a novel thawing method of ultrasound-assisted slightly basic electrolyzed water (UST), and its influences on the physicochemical and histological properties of shrimp, as well as the structural of myofibrillar proteins (MPs) in shrimp were evaluated. Results indicated that the UST treatment greatly reduced 48.9 % thawing time of frozen shrimp compared to traditional thawing approaches. Meanwhile, the UST effectively decreased the generation of malondialdehyde (MDA), total volatile basic nitrogen (TVB-N), and carbonyl compounds in the thawed shrimps. In addition, it significantly preserved the elasticity and integrity of muscle fiber. Notably, the UST reduced the damage of thawing to the spatial structures of MPs, thereby greatly keeping the stability of protein. All these favorable changes maintained the water holding capacity (WHC) and quality of shrimp. Therefore, the UST is a promising non-thermal thawing technology for aquatic products.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S1350417724001792Test; https://doaj.org/toc/1350-4177Test

الوصول الحر: https://doaj.org/article/daff7e14e22c4f0f9902b4254f2963d6Test

المؤلفون: Songqing Zhang, Jiarui Lou, Chenhui Wang, Qian Li, Yufeng Li, Linfeng Jin, Changfa Guo

المصدر: Materials Today Catalysis, Vol 5, Iss , Pp 100055- (2024)

مصطلحات موضوعية: Mn–Cd–S solid solution, Modification, Photocatalytic water splitting, Photocatalytic carbon dioxide reduction, Photodegradation, Chemistry, QD1-999

الوصف: Semiconductor photocatalyzed energy production and environment treatment have received a lot of attention. Mn–Cd–S solid solutions (MnxCd1−xS) with tunable band structure, suitable redox capacity, and visible light response is recognized as one of the most promising photocatalysts for practical applications. However, low separation efficiency of photogenerated carriers and sluggish reaction kinetics restricts its photocatalytic activity. This review discusses the advantages and drawbacks of MnxCd1−xS for photocatalysis in terms of electronic band structure and surveys the modification strategies of photocatalytic activity, including modulation of Mn/Cd ratio, morphology/structure regulation, defect engineering, construction of heterojunction, loading cocatalysts, and integration of multiple strategies. Then, the progress in photocatalytic water splitting to hydrogen, carbon dioxide reduction, and pollutant degradation using MnxCd1−xS-based materials are summarized. Finally, it is concluded by outlining the challenges and opportunities for developing efficient photocatalysts based on MnxCd1−xS.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2949754X24000176Test; https://doaj.org/toc/2949-754XTest

الوصول الحر: https://doaj.org/article/30e4bdf17d5b41308274f175d4cc2e01Test

المؤلفون: Siwei Fang, Guiqi Zhang, Yufeng Li, Jiangtao Li

المصدر: Applied Sciences, Vol 14, Iss 7, p 2805 (2024)

مصطلحات موضوعية: Hamming distance, controller area network (CAN), intrusion detection system, in-vehicle network, security, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999

الوصف: The use of a Controller Area Network (CAN) bus in the automotive industry for connecting electronic control units (ECUs) poses security vulnerabilities due to the lack of built-in security features. Intrusion Detection Systems (IDSs) have emerged as a practical solution for safeguarding the CAN bus. However, developing an effective IDS for in-vehicle CAN buses encounters challenges in achieving high precision for detecting attacks and meeting real-time requirements with limited computational resources. To address these challenges, we propose a novel method for anomaly detection on CAN data using windowed Hamming distance. Our approach utilizes sliding windows and Hamming distance to extract features from time series data. By creating benchmark windows that span at least one cycle of data, we compare newly generated windows with recorded benchmarks using the Hamming distance to identify abnormal CAN messages. During the experimental phase, we conduct extensive testing on both the public car-hack dataset and a proprietary dataset. The experimental results indicate that our method achieves an impressive accuracy of up to 99.67% in detecting Denial of Service (DoS) attacks and an accuracy of 98.66% for fuzzing attacks. In terms of two types of spoofing attacks, our method achieves detection accuracies of 99.48% and 99.61%, respectively, significantly outperforming the methods relying solely on the Hamming distance. Furthermore, in terms of detection time, our method significantly reduces the time consumption by nearly 20-fold compared to the approach using deep convolutional neural networks (DCNN), decreasing it from 6.7 ms to 0.37 ms.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2076-3417/14/7/2805Test; https://doaj.org/toc/2076-3417Test

الوصول الحر: https://doaj.org/article/c0d3357556c740df8dec6f8b80d73ccaTest

المؤلفون: Shaocheng Zhang, Yufeng Li, Chuanmin Ding, Yanxia Niu, Yafeng Zhang, Bing Yang, Gangsen Li, Junwen Wang, Zili Ma, Li-Juan Yu

المصدر: Small Structures, Vol 4, Iss 2, Pp n/a-n/a (2023)

مصطلحات موضوعية: Al sites, metal–support interactions, platinum, single-atom catalysts, thermally induced dispersions, Physics, QC1-999, Chemistry, QD1-999

الوصف: Atomically dispersed Pt atoms encapsulated inside ZSM‐5 zeolites are synthesized via thermally induced dispersion under oxygen atmosphere. Dispersion of Pt clusters within ZSM‐5 and silicate‐1 is compared to investigate its dependence on the support and calcination temperature. Detailed density functional theory (DFT) calculations are applied to rationalize the dispersion process, which includes the detachment of Pt species from the bulk and the migration of volatile PtO x species, both of which are accelerated by thermal treatment at high temperature. DFT results also indicate that Al atoms within zeolites provide the anchoring sites to retain the dominated PtO species, though their interaction with the support is weakened with the increase in temperature. Our findings suggest that successful dispersion depends on the strong metal–support interaction and thermal treatment at moderate temperature (500 °C) which is crucial to balance the detachment and fixation of Pt atoms. This study paves the way to further understand the dispersion mechanism and assist in the development of stable single‐atom catalysts.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/2688-4062Test

الوصول الحر: https://doaj.org/article/dc844223133e4cafa12fffa66c29aa6bTest

المؤلفون: He Zhang, Cunxiao Miao, Linghao Zhang, Yunpeng Zhang, Yufeng Li, Kaiwen Fang

المصدر: Applied Sciences, Vol 13, Iss 20, p 11278 (2023)

مصطلحات موضوعية: UAV swarms, simulation platform, ISMN, relative navigation, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999

الوصف: Accurate localization is the foundation of unmanned aerial vehicle (UAV) swarm applications in the global navigation satellite system (GNSS)-denied environment. However, the implementation of UAV formation in the real world is costly and time-consuming, which leads to difficulties in developing navigation algorithms. A real-time simulator for navigation in GNSS-denied environments is proposed, which includes world, model, controller, scene matching navigation (SMN), relative navigation and formation controller modules. Each module can be modified, which means that users can test their own algorithms. A novel inertial-aided SMN (ISMN) algorithm is developed and a relative navigation method that does not rely on inter communication is proposed. ISMN and relative navigation based on a camera and ultrawideband (UWB) are tested on the platform. Based on the developed simulation system, the navigation algorithms can be verified easily, which can reduce the time and personnel requirements during flight testing.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2076-3417/13/20/11278Test; https://doaj.org/toc/2076-3417Test

الوصول الحر: https://doaj.org/article/d773b4ce52aa436a80992afe330bee12Test

المؤلفون: Shan Liu, Kunihiko Morihiro, Fumika Takeuchi, Yufeng Li, Akimitsu Okamoto

المصدر: Frontiers in Chemistry, Vol 11 (2023)

مصطلحات موضوعية: crosslinking, DNA methyaltion, epigenetics, fluorescent in situ hybridization (FISH), metal ion, Chemistry, QD1-999

الوصف: DNA methylation plays an important physiological function in cells, and environmental changes result in fluctuations in DNA methylation levels. Metal ions have become both environmental and health concerns, as they have the potential to disrupt the genomic DNA methylation status, even on specific sequences. In the current research, the methylation status of two typical repetitive DNA elements, i.e., long-interspersed nuclear element-1 (LINE-1) and alpha satellite (α-sat), was imaged and assessed using methylation-specific fluorescence in situ hybridization (MeFISH). This technique elucidated the effect of several metal ions on the methylation levels of repetitive DNA sequences. The upregulation and downregulation of the methylation levels of repetitive DNA elements by various metal ions were confirmed and depended on their concentration. This is the first example to investigate the effects of metal ions on DNA methylation in a sequence-specific manner.

وصف الملف: electronic resource

العلاقة: https://www.frontiersin.org/articles/10.3389/fchem.2023.1122474/fullTest; https://doaj.org/toc/2296-2646Test

الوصول الحر: https://doaj.org/article/e4cf6f1347fc4a999c5a5a86f71e0023Test

المؤلفون: Haifeng Yang, Yufeng Li, Jiawei Wang, Aixing Li, Kun Li, Chuangcheng Xu, Minyan Zhang, Zhenhuan Tian, Qiang Li, Feng Yun

المصدر: Nanomaterials, Vol 13, Iss 13, p 2014 (2023)

مصطلحات موضوعية: micro-LED, sidewall damage, spatially resolved photoluminescence, Chemistry, QD1-999

الوصف: Spatially resolved photoluminescence at the sub-micro scale was used to study the optical non-uniformity of the micro-LED under varied power density excitation levels. The trend of the efficiency along injection levels were found to be highly dependent on the location of the chip mesa. The sidewall was 80% lower than the center under low-power density excitation, but was 50% higher under high-power density excitation. The external quantum efficiency droop at the center and the sidewall was 86% and 52%, respectively. A 2 µm band area near the sidewall was characterized where the efficiency and its trends changed rapidly. Beyond such band, the full width at half maximum and peak wavelength variation across the chip varied less than 1 nm, indicating high uniformity of the material composition. The sudden change = in the band, especially under high level excitation indicates the indium composition change formed by ion residues on the sidewall affect the distribution of charge carriers. These findings contribute to the understanding of cause of efficiency disadvantage and non-uniformity problems in small-size micro-LEDs.

العلاقة: https://www.mdpi.com/2079-4991/13/13/2014Test; https://doaj.org/toc/2079-4991Test; https://doaj.org/article/5ccf4339adc04840b29ce1691bc56ceaTest

الإتاحة: https://doi.org/10.3390/nano13132014Test
https://doaj.org/article/5ccf4339adc04840b29ce1691bc56ceaTest

المؤلفون: Yufeng Li, Jingbin Li, Qingwang Yao, Wenhao Zhou, Jing Nie

المصدر: Processes, Vol 10, Iss 417, p 417 (2022)

مصطلحات موضوعية: monocular vision, visual positioning, steering control, path prediction, Chemical technology, TP1-1185, Chemistry, QD1-999

الوصف: To solve the issue that the monocular vision vehicle navigation system is limited by the field of vision acquired by the charge-coupled device camera and cannot acquire navigation turning path information throughout the turning process, decreasing the vehicle turning control accuracy, this paper proposed a turning control algorithm based on monocular vision vehicle turning path prediction. Firstly, the camera’s distortion was adjusted. Secondly, the camera imaging model was built, and the turning path’s position information was determined using the imaging position relationship. The vehicle motion model was built in accordance with the vehicle steering mode. Lastly, the cornering trajectory of a vehicle was estimated using the vehicle’s front axle length and front-wheel adjustment data, determining the vehicle turning point and turn operations on the basis of the projected relationship between the vehicle turning track and the turning path position. The experimental results showed that the proposed algorithm can effectively measure the position parameters of the cornering path and complete vehicle cornering control. The maximum absolute error of intercept and slope in turn path position parameters were 0.2525 m and 0.014 m, respectively. The cornering control accuracy was 0.093 m and 0.085 m, which met the vehicle navigation cornering control requirements. At the same time, the research can provide theoretical reference for research on precise navigation control of other cornering vehicles and other path guidance modes.

العلاقة: https://www.mdpi.com/2227-9717/10/2/417Test; https://doaj.org/toc/2227-9717Test; https://doaj.org/article/8f0812929b364906a03a28608ffff303Test

الإتاحة: https://doi.org/10.3390/pr10020417Test
https://doaj.org/article/8f0812929b364906a03a28608ffff303Test

المؤلفون: Faraz Ahmed, Zulfiqar Ali Mirani, Pirbhat Nadir Mirani, Muhammad Janees Imdad, Fouzia Zeeshan Khan, Muhammad Naseem Khan, Abdul Basit Khan, Yufeng Li, Yong Zhao

المصدر: Applied Sciences, Vol 12, Iss 8357, p 8357 (2022)

مصطلحات موضوعية: heterogeneity, pH stress, biofilm formation, imipenem resistance, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999

الوصف: The present study aimed to unveil the phenotypic heterogeneity and heteroresistance of P. aeruginosa to acidic stress and imipenem. Furthermore, the growth, morphology, and potential for biofilm formation of the subject isolates at different pHs were assessed. Isolates of P. aeruginosa were recovered from juice samples and confirmed by molecular analysis. Antibiotics sensitivity was evaluated using the Kirby–Bauer-disk diffusion method, and the MIC for imipenem was determined, followed by a biofilm formation assay and population analysis. Scanning electron microscopy (SEM) was used to visualize biofilm formation. The subject isolates persisted in an acidic environment and adopted a biofilm lifestyle. The population analysis assay indicated the presence of two distinct phenotypes, i.e., a normal colony phenotype (NCP) and slow growing colony phenotype (SGCP). NCP showed visible colonies after 48 h, while SGCP colonies appeared after 72 h of incubation. Both displayed heteroresistance to imipenem and susceptibility to other antibiotics. Biofilm formation at acidic pH was observed in both phenotypes. Interestingly, the recovery of SGCP was increased in an acidic environment. Biofilm consortia were highly resistant to imipenem. The present study indicated that P. aeruginosa persisted for a long time in an acidic environment, through phenotypic alteration. The subject isolates adopted a biofilm lifestyle and reduced metabolism, to neutralize the effects of acidic pH and imipenem toxicity. Interestingly, the biofilm consortia harbored metabolically active (NCP), as well as inactive populations, of (SGCP), to maintain an active growth and persistency. SGCP retained the potential to revert to NCP upon subsequent sub-culturing in plentiful nutrients and optimum conditions.

العلاقة: https://www.mdpi.com/2076-3417/12/16/8357Test; https://doaj.org/toc/2076-3417Test; https://doaj.org/article/eb2876ffb3984f51bf4331def5446e0dTest

الإتاحة: https://doi.org/10.3390/app12168357Test
https://doaj.org/article/eb2876ffb3984f51bf4331def5446e0dTest

المؤلفون: Aixing Li, Yufeng Li, Jie Song, Haifeng Yang, Ye Zhang, Peng Hu, Zhenhuan Tian, Minyan Zhang, Qiang Li, Feng Yun

المصدر: Nanomaterials, Vol 12, Iss 3386, p 3386 (2022)

مصطلحات موضوعية: semipolar LEDs, localization states, scanning near-field optical microscopy, Chemistry, QD1-999

الوصف: The differences in spatially optical properties between blue and green quantum wells (QWs) in a monolithic dual-wavelength semipolar (20-21) structure were investigated by scanning near-field optical microscopy (SNOM). The shortest wavelength for green QWs and the longest wavelength for blue QWs were both discovered in the region with the largest stress. It demonstrated that In composition, compared to stress, plays a negligible role in defining the peak wavelength for blue QWs, while for green QWs, In composition strongly affects the peak wavelength. For green QWs, significant photoluminescence enhancement was observed in the defect-free region, which was not found for blue QWs. Furthermore, the efficiency droop was aggravated in the defect-free region for green QWs but reduced for blue QWs. It indicates that carrier delocalization plays a more important role in the efficiency droop for QWs of good crystalline quality, which is experimentally pointed out for the first time.

العلاقة: https://www.mdpi.com/2079-4991/12/19/3386Test; https://doaj.org/toc/2079-4991Test; https://doaj.org/article/a3c64700c51a425aa16849b2e3e1e744Test

الإتاحة: https://doi.org/10.3390/nano12193386Test
https://doaj.org/article/a3c64700c51a425aa16849b2e3e1e744Test