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Optical Image Split-encryption Based on Object Plane for Completely Removing the Silhouette Problem
Weina Li,Anh-Hoang Phan,전석희,김남 한국광학회 2013 Current Optics and Photonics Vol.17 No.5
We propose a split-encryption scheme on converting original images to multiple ciphertexts. This conversion introduces one random phase-only function (POF) to influence phase distribution of the preliminary ciphertexts. In the encryption process, the original image is mathematically split into two POFs. Then, they are modulated on a spatial light modulator one after another. And subsequently two final ciphertexts are generated by utilizing two-step phase-shifting interferometry. In the decryption process, a high-quality reconstructed image with relative error RE = 7.6061×10-31 can be achieved only when the summation of the two ciphertexts is Fresnel-transformed to the reconstructed plane. During the verification process, any silhouette information was invisible in the two reconstructed images from different single ciphertexts. Both of the two single REs are more than 0.6, which is better than in previous research. Moreover, this proposed scheme works well with gray images.
Complete conversion of cellulose to water soluble substances by pretreatment with ionic liquids
Weina Liu,Weize Wu,Yucui Hou,Shuhang Ren,Wenhua Wang 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.10
Pretreatment of cellulose to water soluble substances (WSS) can enhance its efficient conversion in water solvent, such as ethanol fermentation. In this work, we found ionic liquid (IL), 1-methyl-3-methylimidazolium dimethylphosphate ([Mmim][DMP]), could convert efficiently cellulose to obtain WSS, and the product WSS and IL mixture could be separated by ethanol anti-solvent way. Effects of ILs, time, temperature and water on cellulose conversion were investigated. NMR, FTIR, XRD and SEM were employed to study the mechanism of cellulose conversion with ILs. The results indicate that [Mmim][DMP] has a greater ability to interact with cellulose than [Bmim][Cl] under the same conditions. Cellulose can be completely converted into WSS in [Mmim][DMP] under all the investigated temperatures from 140 to 160 oC. Increasing temperature is beneficial to the conversion rate of cellulose. But the presence of water can decrease the conversion rate of cellulose. During the treatment by [Mmim][DMP], the hydroxyls of cellulose can form hydrogen bonds with both anion and cation of [Mmim][DMP], and after the treatment the inter- and intramolecular hydrogen bonds of cellulose and the compact structure of cellulose are collapsed.
Research progress on the interfacial phases of ceramic matrix composites
Weina Guo,Yantao Gao 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.2
Continuous fiber toughened ceramic matrix composites (CMCs) have a wide range of applications in fields of aerospacevehicles and nuclear power plants because of their excellent properties. As one of the basic components of CMCs, theinterfacial phase plays a great role in the performance of CMCs. By adjusting the interfacial phase, the tougheningmechanisms such as fiber pull-out and debonding of CMCs can be brought into full play. The paper introduced the designprinciples of interfacial engineering of CMCs. The methods of interfacial preparation and interfacial strength testing of CMCswere summarized, and then the advantages and disadvantages of each methods were analyzes. The recent status of interfacephase of CMCs was also reviewed. Finally, the development direction of interface phase of CMCs was prospected.
Weina Wang,Qiuhua Wu,Xiaohuan Zang,Chun Wang,Zhi Wang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
In this paper, a layered-carbon-Fe3O4 (LC-Fe3O4) hybrid material was synthesized through a facile one-pot solvothermal method and used as the adsorbent for the preconcentration of some phthalate esters (dimethyl phthalate, diethyl phthalate, diallyl phthalate, diisobutyl phthalate and benzyl butyl phthalate) in water samples. The effects of the adsorbent dosage, extraction time, the solution pH and salinity on the adsorption of the phthalate esters (PAEs) were investigated. The magnetic nanocomposite adsorbent could remove and enrich the PAEs from water samples efficiently. After the adsorption, the analytes were desorbed and then determined by high performance liquid chromatography-ultraviolet detection. Under the optimum conditions, the enrichment factors of the method for the analytes were in the range from 161 to 180. A linear response with peak area as the quantification signal was observed in the concentration range from 0.5 to 100 ng mL−1. The limits of detection (S/N = 3) of the method were between 0.08 and 0.1 ng mL−1. The method was suitable for the determination of trace phthalate esters in environmental water samples.
Illuminating the hepatotoxic mechanism of norcantharidin in rats using metabolomics analysis
Cheng Weina,Chen Qihong,Wang Xiaoning,Liu Liu,Li Xiaofei,Duan Cancan,Zhang Jianyong 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.3
Norcantharidin (NCTD) has multiple antitumor effects. However, NCTD can induce significant hepatotoxicity and the mechanism of hepatotoxicity is not clear for now.This study aimed to explore the hepatotoxicity of NCTD in rat by ultra-performance liquid chromatography (UPLC) quadrupole time-of-flight (Q-TOF)-MS (UPLC/Q-TOF-MS) metabolomics.Serum biochemical indices including alanine aminotransferase (ALT) and total bilirubin (T-BIL) were significantly increased. Histopathological and ultrastructure results revealed that hepatocytes were damaged. Furthermore, the metabolomics results showed that 11 metabolites in serum and 8 metabolites in liver were differential metabolites for NCTD hepatotoxicity. Four metabolic pathways including the sphingolipid metabolism, purine metabolism, arachidonic acid metabolism, and glycerophospholipid metabolism were the key metabolic pathways related to NCTD hepatotoxicity.The metabolomics analysis in this study reveal new clues on the hepatotoxicity mechanism of NCTD in rats. These findings have potential applications in the toxicity study of NCTD.
Yang Weina,Kang Qian,Li Chunlei,Bo Shuchun,Wang Yue 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.3
Background During preeclampsia (PE), reactive oxygen species (ROS) production and infl ammation are increased. Matrine exerts diverse pharmacological eff ects, including anti-infl ammatory and anti-apoptotic eff ects. Objective The present study aimed to study the therapeutic eff ects of matrine on PE. Human trophoblasts (HTR-8/SVneo cells) were treated with H 2 O 2 to simulate oxidative stress, followed by treatment with various concentrations of matrine. Next, fl ow cytometry was used to examine apoptosis. Cell invasion and migration were examined by Transwell and scratch wound assays, respectively. The concentrations of IL-6, IL-8, and TNF-α were quantifi ed by enzyme-linked immunosorbent assays. The expression levels of miR-19a-3p and ZEB2 were quantifi ed by qRT-PCR. The interaction between miR-19a-3p and ZEB2 was examined by a dual-luciferase reporter assay. Result Matrine attenuated H 2 O 2 -induced increases in ROS levels, apoptosis, and cytokine release in HTR/SVneo cells. Matrine also increased cell migration and invasion during oxidative stress by reducing miR-19a-3p expression. Moreover, miR-19a-3p can target ZEB2 directly. Conclusion During oxidative stress, matrine can reduce ROS levels, apoptosis, and infl ammation in human trophoblasts and promote migration and invasion via miR-19a-3p, off ering a potential new approach for the treatment of PE.
Wang, Weina,Wu, Qiuhua,Zang, Xiaohuan,Wang, Chun,Wang, Zhi Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
In this paper, a layered-carbon-$Fe_3O_4$ (LC-$Fe_3O_4$) hybrid material was synthesized through a facile one-pot solvothermal method and used as the adsorbent for the preconcentration of some phthalate esters (dimethyl phthalate, diethyl phthalate, diallyl phthalate, diisobutyl phthalate and benzyl butyl phthalate) in water samples. The effects of the adsorbent dosage, extraction time, the solution pH and salinity on the adsorption of the phthalate esters (PAEs) were investigated. The magnetic nanocomposite adsorbent could remove and enrich the PAEs from water samples efficiently. After the adsorption, the analytes were desorbed and then determined by high performance liquid chromatography-ultraviolet detection. Under the optimum conditions, the enrichment factors of the method for the analytes were in the range from 161 to 180. A linear response with peak area as the quantification signal was observed in the concentration range from 0.5 to $100ng\;mL^{-1}$. The limits of detection (S/N = 3) of the method were between 0.08 and $0.1ng\;mL^{-1}$. The method was suitable for the determination of trace phthalate esters in environmental water samples.
Hansong Xue,Weina Zhang,Xinyu Li,Xiaochang You,Jinsong Rao,Fusheng Pan 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
Samarium oxide (Sm2O3) nanoparticles with a narrow sizedistribution were successfully synthesized by microwaveassistedusing urea as precipitant without surfactant ortemplate. The Sm2O3 particles were characterized using X-raydiffraction analysis, field-emission scanning electronmicroscopy, field-emission transmission electron microscopyand ultraviolet-visible-near-infrared spectrophotometer. Theresults showed that the samples prepared with differentconcentration of urea had different particle sizes. When theconcentration of urea was 1.2 mol/L, the sample had thesmallest particle size. A possible mechanism for the formationof the nanoparticles was proposed. Optical properties ofSm2O3 nanoparticles showed that the nanoparticles had astrong absorption property in the deep ultraviolet regionbetween 200 nm and 270 nm.