http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Yu Yongqiang (검색결과 10 건)
- 무료
- 기관 내 무료
- 유료
-
-
Yongqiang Wang,Changhui Feng,Yu Luo,Ruoyu Fei 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
To study the variation of surface characteristics of glass fiber reinforced epoxy composite insulation materialsduring the development of tracking, this paper established an experimental platform for tracking under the inclined platemethod and prepared samples of glass fiber reinforced epoxy resin. In this paper, according to the experimental dischargephenomenon, discharge repetition rate phase diagram and corrosion degree of materials, the process of tracking was dividedinto four stages: initiation, stability, development and outbreak stages. Scanning electron microscope was used to observe thechange of micromorphology of samples in different stages of tracking. The content of elements in different stages of trackingwas determined by energy dispersive spectrometer. The surface characteristic functional groups in different stages of trackingwere measured by Fourier transform infrared spectroscopy. The results show that with the change of surface morphology andthe formation of surface products during tracking, the content of C element in the spherical region of the material decreasedfirst and then increased, and the content of O and Si increased first and then decreased. The epoxy group of the material wasgradually decomposed. Carbonyl group was generated on the surface of the material, and then decomposed during theoutbreak stages. In addition, the deterioration mechanism of thermal aging and tracking was quite different. Thermal agingprovided convenient routes for the electron injection into the material during tracking, thus reducing the tracking and erosionresistance of the material.
-
Novel Robust High Dynamic Range Image Watermarking Algorithm Against Tone Mapping
( Yongqiang Bai ),( Gangyi Jiang ),( Hao Jiang ),( Mei Yu ),( Fen Chen ),( Zhongjie Zhu ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.9
High dynamic range (HDR) images are becoming pervasive due to capturing or rendering of a wider range of luminance, but their special display equipment is difficult to be popularized because of high cost and technological problem. Thus, HDR images must be adapted to the conventional display devices by applying tone mapping (TM) operation, which puts forward higher requirements for intellectual property protection of HDR images. As the robustness presents regional diversity in the low dynamic range (LDR) watermarked image after TM, which is different from the traditional watermarking technologies, a concept of watermarking activity is defined and used to distinguish the essential distinction of watermarking between LDR image and HDR image in this paper. Then, a novel robust HDR image watermarking algorithm is proposed against TM operations. Firstly, based on the hybrid processing of redundant discrete wavelet transform and singular value decomposition, the watermark is embedded by modifying the structure information of the HDR image. Distinguished from LDR image watermarking, the high embedding strength can cause more obvious distortion in the high brightness regions of HDR image than the low brightness regions. Thus, a perceptual brightness mask with low complexity is designed to improve the imperceptibility further. Experimental results show that the proposed algorithm is robust to the existing TM operations, with taking into account the imperceptibility and embedded capacity, which is superior to the current state-of-art HDR image watermarking algorithms.
-
Yongqiang Wang,Yu Luo,Changhui Feng 한국고분자학회 2019 Macromolecular Research Vol.27 No.10
This study aimed to investigate the effects of temperature and aging on the characteristic parameters of dielectric spectra of epoxy resin impregnated paper insulation. A broadband dielectric spectra test platform was established and an equivalent physical model of the valve side dry-type bushing of the converter transformer was developed. Different degrees of thermal aging were performed at 130 °C for 0, 4, 8, 16, and 32 days. In addition, variation of the complex permittivity and dielectric loss factors of epoxy resin impregnated paper at different temperatures and different degrees of aging was revealed. The dielectric spectra test results were fitted using the Havriliak-Negami (HN) relaxation model. The characteristic parameters were extracted, and the influences of temperature and aging on the characteristic parameters of the HN model were analyzed. The results show that in the low frequency range, temperature and aging exert greater influences on the complex permittivity. In the high frequency range, temperature and aging have smaller effect. The relaxation time and temperature satisfy the relationship of the Arrhenius equation, and the relaxation strength increases exponentially with increasing temperature. The relaxation time τ, the relaxation intensity Δε, the shape parameter α, and the shape parameter β can characterize the aging degree of paper insulation. A linear relationship between relaxation and aging times, and an exponential relationship between relaxation intensity and aging time were revealed.
-
Yuqin Liu,Yu Shi,Yongqiang Liu,Ailin Fan,Bo Xu,Haiyan Qiu,Guihong Lan,Ming Zhang 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.6
The overuse of antibiotics has become a serious environmental problem, and addressing how to remove antibiotics from aquatic environments poses a significant challenge. This study prepared a porous biochar material (BSJ) using natural Jacaranda fruit shells as raw materials and combined it with an electric Fenton system (EF-BSJ) to degrade ciprofloxacin hydrochloride (CIP). Characterization and analysis of biochar using SEM, BET, Raman spectroscopy, and other methods revealed that the porous structure and aromatic functional groups of biochar play a crucial role in adsorbing CIP. The effects of carbonization temperature and carbonization time on the adsorption of CIP by biochar were investigated during the biochar preparation process. At 800℃ and 1.5 hours, the maximum adsorption efficiency of biochar for CIP is 96.88%. In addition, thestudy investigated the impact of cathode and anode materials of the EF-BSJ system on the degradation efficiency of CIP. When platinum-titnium plating was used as the anode and foam nickel electrode as the cathoded, the CIP removal rate could reach 95.48%. Finally, the UV full-band scanning method was used to determine that CIP was degraded into small molecule substances, achieving the goal of removing CIP. This study introduces a novel strategy for eliminating antibiotics.
-
MOF-Derived Porous CeO2-x/C Nanorods and their Applications in Uric Acid Biosensor
Jinbao Luo,Jiewu Cui,Yan Wang,Dongbo Yu,Yongqiang Qin,Hongmei Zheng,Yu Hong,Yong Zhang,Yucheng Wu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
Selectivity is significant to the practical applications of electrochemical biosensors in clinical and diagnostic field. In this paper, porous CeO2-x/C nanorods (NRs) derived from Ce-based metal organic framework (MOF) were synthesized and employed as substrate to construct uric acid biosensors with high sensitivity and selectivity at low working potential. The morphology, microstructures and elemental states of as-prepared samples were investigated by SEM, XRD, TEM and XPS systematically. It was found that a great amount of oxygen vacancies was introduced into the interstitial of CeO2 and nonstoichiometric CeO2/C (CeO2-x/C) nanorods based on Ce-MOF were formed under calcination in Ar atmosphere. The increased oxygen vacancies enabled the negatively shifting of the working potential towards H2O2 detection for CeO2-x/C nanorods, favoring the construction of biosensors based on the detection of H2O2. Uric biosensors based on CeO2-x/C NRs exhibited a high sensitivity of 220.0 μA · cm -2 · mM -1 and a linear range from 50 μM to 1000 μM at working potential of -0.4 V versus SCE. It also exhibited superior selectivity toward interferents coexisting with uric acid in urine due to the low working potential.
-
-
Wang Huakai,Wang Yanan,Zhang Yu,Li Juntao,Mi Yihai,Xue Yongqiang,Li Jiaan,Ma Yongxi 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.5
Objective: The objective of this study was to determine whether dietary supplementation with a functional fatty acid blend (FA) that contains 31.4% butyric acid and 4.99% mediumchain FA improve growth performance, antioxidant capacity, immunity status, and antiinflammatory ability in weaned piglets. Methods: One hundred and forty-four healthy piglets (Duroc×Landrace×Yorkshire) with an average body weight (BW) of 7.98±3.43 kg were randomly divided into three groups with six replicate pens and eight piglets per pen: Normal control (NC): a corn-soybean basal diet; FA1: a basal diet supplemented with 1,000 mg/kg of a functional FA; FA2: a basal diet supplemented with 2,000 mg/kg of a functional FA. The experiment lasted for 28 d. On d 14 and 28, one piglet in each pen from NC and FA2 groups was randomly selected for antioxidative index and immunoglobulins. On d 28, one piglet in each pen from NC and FA2 groups was randomly selected for intestinal morphology and inflammatory factor. Results: We observed that FA supplementation linearly increased (p<0.05) average daily gain and the final BW. There was higher (p<0.05) catalase on d 14, and immunoglobulin (Ig) A and IgM on d 28 in piglets supplemented with FA2 than in the NC group. Moreover, dietary FA2 reduced (p<0.05) crypt depth of ileum in piglets. The concentrations of tumor necrosis factor-α, interleukin (IL)-1β, IL-8, and IL-10 in jejunum were lower (p<0.05) in the FA2 group compared with the NC group. Conclusion: Therefore, the overall results suggests that the FA may help to improve gut health, antioxidant status, and immune parameters resulting in the improvement of growth performance.
-
Song Lei,Qiu Xiaoming,Zhang Cun,Zhou Hang,Guo Wenmin,Ye Yu,Wang Rujia,Xiong Hui,Zhang Ji,Tang Dongfang,Zou Liwei,Wang Longsheng,Yu Yongqiang,Guo Tingting 대한영상의학회 2024 Korean Journal of Radiology Vol.25 No.2
Objective: This study aimed to determine the predictive performance of non-contrast CT (NCCT) signs for hemorrhagic growth after intracerebral hemorrhage (ICH) when stratified by onset-to-imaging time (OIT). Materials and Methods: 1488 supratentorial ICH within 6 h of onset were consecutively recruited from six centers between January 2018 and August 2022. NCCT signs were classified according to density (hypodensities, swirl sign, black hole sign, blend sign, fluid level, and heterogeneous density) and shape (island sign, satellite sign, and irregular shape) features. Multivariable logistic regression was used to evaluate the association between NCCT signs and three types of hemorrhagic growth: hematoma expansion (HE), intraventricular hemorrhage growth (IVHG), and revised HE (RHE). The performance of the NCCT signs was evaluated using the positive predictive value (PPV) stratified by OIT. Results: Multivariable analysis showed that hypodensities were an independent predictor of HE (adjusted odds ratio [95% confidence interval] of 7.99 [4.87–13.40]), IVHG (3.64 [2.15–6.24]), and RHE (7.90 [4.93–12.90]). Similarly, OIT (for a 1-h increase) was an independent inverse predictor of HE (0.59 [0.52–0.66]), IVHG (0.72 [0.64–0.81]), and RHE (0.61 [0.54– 0.67]). Blend and island signs were independently associated with HE and RHE (10.60 [7.36–15.30] and 10.10 [7.10–14.60], respectively, for the blend sign and 2.75 [1.64–4.67] and 2.62 [1.60–4.30], respectively, for the island sign). Hypodensities demonstrated low PPVs of 0.41 (110/269) or lower for IVHG when stratified by OIT. When OIT was ≤ 2 h, the PPVs of hypodensities, blend sign, and island sign for RHE were 0.80 (215/269), 0.90 (142/157), and 0.83 (103/124), respectively. Conclusion: Hypodensities, blend sign, and island sign were the best NCCT predictors of RHE when OIT was ≤ 2 h. NCCT signs may assist in earlier recognition of the risk of hemorrhagic growth and guide early intervention to prevent neurological deterioration resulting from hemorrhagic growth.
-
Yaqiong Zhu,Nan Peng,Jing Wang,Zhuang Jin,Lianhua Zhu,Yu Wang,Siming Chen,Yongqiang Hu,Tieyuan Zhang,Qing Song,Fang Xie,Lin Yan,Yingying Li,Jing Xiao,Xinyang Li,Bo Jiang,Jiang Peng,Yuexiang Wang,Yukun 한국생체재료학회 2022 생체재료학회지 Vol.26 No.3
Background: Developing biocompatible nerve conduits that accelerate peripheral nerve regeneration, lengthening and functional recovery remains a challenge. The combined application of nerve microtissues and platelet-rich plasma (PRP) provides abundant Schwann cells (SCs) and various natural growth factors and can compensate for the deficiency of SCs in the nerve bridge, as well as the limitations of applying a single type of growth factor. Multimodal ultrasound evaluation can provide additional information on the stiffness and microvascular flow perfusion of the tissue. This study was designed to investigate the effectiveness of a novel tissue-engineered nerve graft composed of an autogenous vein, nerve microtissues and PRP in reconstructing a 12-mm tibial nerve defect and to explore the value of multimodal ultrasound techniques in evaluating the prognosis of nerve repair. Methods: In vitro, nerve microtissue activity was first investigated, and the effects on SC proliferation, migration, factor secretion, and axonal regeneration of dorsal root ganglia (DRG) were evaluated by coculture with nerve microtissues and PRP. In vivo, seventy-five rabbits were equally and randomly divided into Hollow, PRP, Micro-T (Microtissues), Micro-T + PRP and Autograft groups. By analysing the neurological function, electrophysiological recovery, and the comparative results of multimodal ultrasound and histological evaluation, we investigated the effect of these new nerve grafts in repairing tibial nerve defects. Results: Our results showed that the combined application of nerve microtissues and PRP could significantly promote the proliferation, secretion and migration of SCs and the regeneration of axons in the early stage. The Micro-T + PRP group and Autograft groups exhibited the best nerve repair 12 weeks postoperatively. In addition, the changes in target tissue stiffness and microvascular perfusion on multimodal ultrasound (shear wave elastography; contrast-enhanced ultrasonography; Angio PlaneWave UltrasenSitive, AngioPLUS) were significantly correlated with the histological results, such as collagen area percentage and VEGF expression, respectively. Conclusion: Our novel tissue-engineered nerve graft shows excellent efficacy in repairing 12-mm defects of the tibial nerve in rabbits. Moreover, multimodal ultrasound may provide a clinical reference for prognosis by quantitatively evaluating the stiffness and microvescular flow of nerve grafts and targeted muscles
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
