Anionic trash control in high-yield pulp (HYP) containing furnish by using a poly-DADMAC based commercial formulation

Yating Wang,Jianping Ni,Cui Chen,Jinyong Peng,Hongbin Liu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6

High-yield pulp (HYP) is gaining increasing interest in papermaking, the presence of anionic trash hasbeen limiting its application in high-end paper products such as fine papers. In order to control the anionictrash ofHYP, the performances of three anionic trash catchers in terms of charge controland fiber fines andfiller retention enhancement were compared in a laboratory study. It was found that a poly-DADMACbased commercial product had the highest efficiency. The use of CPAM/Bentonite system resulted inhighest fiber fines and filler retention. The best anionic trash controlwas achieved when HYPwas treatedseparately.

중국인의 한국에 대한 우호도, 교역, 국력의 인식에 관한 연구

왕아정(Yating Wang),김재우(Jae-Woo Kim) 한국물류학회 2023 물류학회지 Vol.33 No.3

Pyramid-like CdS nanoparticles grown on porous TiO₂ monolith: An advanced photocatalyst for H₂ production

Du, Jimin,Wang, Huiming,Yang, Mengke,Li, Kaidi,Zhao, Lixin,Zhao, Guoyan,Li, Sujuan,Gu, Xiaolei,Zhou, Yalan,Wang, Le,Gao, Yating,Wang, Weimin,Kang, Dae Joon Pergamon Press 2017 Electrochimica Acta Vol. No.

<P><B>Abstract</B></P> <P>Efficient production of H<SUB>2</SUB> via solar-light-driven water splitting by a semiconductor-based photocatalyst without noble metals is crucial owing to increasingly severe global energy and environmental issues. However, many challenges, including the low efficiency of H<SUB>2</SUB> evolution, low solar light absorption, excited electron–hole pair recombination, and slow transport of photoexcited carriers, must be resolved to enhance the H<SUB>2</SUB> photoproduction efficiency and photocatalyst stability. Here, a two-step method is used to synthesize advanced H<SUB>2</SUB>-generating photocatalysts consisting of pyramid-like CdS nanoparticles grown on a porous TiO<SUB>2</SUB> monolith, which show promising photocatalytic activity for the hydrogen evolution reaction. Furthermore, the stability of the photocatalysts is examined through long-term tests to verify their good durability. Without noble metals as cocatalysts, the photocatalyst can reach a high H<SUB>2</SUB> production rate of 1048.7μmolh<SUP>−1</SUP> g<SUP>−1</SUP> under UV–vis irradiation when the ratio of the CdS nanoparticles to TiO<SUB>2</SUB> is 5mol%. This unusual photocatalytic activity arises from the wide-region light adsorption due to the narrow band gap of CdS, effective separation of electrons and holes due to conduction band alignment at the CdS–TiO<SUB>2</SUB> interface, and favorable reaction sites resulting from the porous structure.</P>

Fe/N-doped carbon framework derived from ZIF-8 on graphene oxide for efficient oxygen reduction reaction

Yating Zhang,Pei He,Dongxian Zhuo,Jianlan Zhang,Nana Zhang,Xiaobo Wang,Gang Lin,Zhenghan Kong 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.2

Exploration of highly effi cient non-noble metal oxygen reduction reaction (ORR) catalysts is essential for the widespreadindustrial utilization of fuel cells. Herein, we demonstrated a hierarchical porous catalyst (denoted as Fe-NC-Gs) using asimple stirring and one-step pyrolysis method. ZIF-8-derived N-doped carbon framework loaded on graphene oxide, on whichFe 3 O 4 and FeS nanoparticles are uniformly dispersed. In the composite nanostructure, a high surface area (470.58 m 2 g −1 )and hierarchical porous structure were observed. The obtained Fe-NC-G-2 exhibits superior ORR properties. The half-wavepotential (E 1/2 ) and the limiting current density in alkaline media were up to 0.85 V and − 5.39 mA cm −2 , respectively, comparableto the commercially available Pt/C. The four-electron-dominated process was exhibited in the ORR catalysis. It alsomanifests a better methanol tolerance and electrochemical stability during the chronoamperometry measurement in 0.1 MKOH. These results suggest that the proposed strategy provides a new pathway to construct effi cient electrocatalysts for ORR.

Optimizing the chlorine evolution reaction performance of Co(OH)2 catalyst for enhanced antifouling ability

Yating Peng,Peng Wang,Jiawei Li,Jiajia Wu,Feng Lin,Dun Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-

Underwater optical instruments are commonly plagued by biofouling. As one of the most useful antifoulingstrategies, electrochemical chlorination is able to prevent biofouling efficiently, but the limited activityand selectivity in chlorine evolution reaction (CER) restrict its practical applications. To address thisproblem, we focus on the optimization of CER performance of cobalt-based catalysts. In this work, weprepared Co(OH)2 with different forms, morphologies, and intercalations. By adopting linear sweepvoltammetry and electrochemical active surface area analysis, it is demonstrated that the a-Co(OH)2exhibits better CER performance than b-Co(OH)2 does, and the manipulation of a-Co(OH)2 morphologycan help to further enhance CER performance. Meanwhile, the intercalation of a-Co(OH)2 plays a minorrole in the CER. Furthermore, based on the screened synthetic condition, the optimized a-Co(OH)2 wasapplied for practical antifouling examination, and its excellent antifouling ability was verified by theinvestigation on bacteria attachment and glass transmittance. The findings in this work not only enrichour understanding on the effects of synthetic conditions on CER performance of cobalt-based catalysts,but also provide useful insights into the development of electrochemical antifouling strategies.

Coffee grounds derived sulfur and nitrogen dual-doped porous carbon for the cathode material of lithium‑sulfur batteries

Wen Yating,Wang Xiaobin,Huang Jingyi,Li Yu,Li Tao,Ren Baozeng 한국탄소학회 2023 Carbon Letters Vol.33 No.4

The development of functional carbon materials using waste biomass as raw materials is one of the research hotspots of lithium-sulfur batteries in recent years. In this work, used a natural high-quality carbon source—coffee grounds, which contain more than 58% carbon and less than 1% ash. Honeycomb-like S and N dual-doped graded porous carbon (SNHPC) was successfully prepared by hydrothermal carbonization and chemical activation, and the amount of thiourea used in the activation process was investigated. The prepared SNHPC showed excellent electrochemical energy storage characteristics. For example, SNHPC-2 has a large pore volume (1.85 cm3·g−1), a high mesoporous ratio (36.76%), and a synergistic effect (S, N interaction). As the cathode material of lithium-sulfur batteries, SNHPC-2/S (sulfur content is 71.61%) has the highest specific capacity. Its initial discharge-specific capacity at 0.2 C is 1106.7 mAh·g−1, and its discharge-specific capacity after 200 cycles is still as high as 636.5 mAh·g−1.

Accelerated Life Test Study on Thyristors of HVDC Converter Valve

Cuicui Liu,Ning Liang,Yating Gou,Jiachen Tian,Fang Zhuo,Feng Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

As the key component of HVDC converter valve system, thyristors have vital impact on the reliability of the entire HVDC transmission project. In order to effectively obtain the life model of thyristor, this paper uses the existing accelerated life test theory, combined with the operating conditions of the converter valve and the relevant characteristics of the thyristors, to deeply analyse the several stress levels that have the most serious impact on the life of the thyristors. An accelerated life test scheme that can effectively guide the life model of the thyristor, according to the test data collected by this test method, the thyristor junction temperature life model under the short-circuit current stress is established, and compared with the thyristor failure rate in the practical engineering, the results show the feasibility of the test scheme and the correctness of the life model.

Using Semantic Knowledge in the Uyghur-Chinese Person Name Transliteration

( Alim Murat ),( Turghun Osman ),( Yating Yang ),( Xi Zhou ),( Lei Wang ),( Xiao Li ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.4

In this paper, we propose a transliteration approach based on semantic information (i.e., language origin and gender) which are automatically learnt from the person name, aiming to transliterate the person name of Uyghur into Chinese. The proposed approach integrates semantic scores (i.e., performance on language origin and gender detection) with general transliteration model and generates the semantic knowledge-based model which can produce the best candidate transliteration results. In the experiment, we use the datasets which contain the person names of different language origins: Uyghur and Chinese. The results show that the proposed semantic transliteration model substantially outperforms the general transliteration model and greatly improves the mean reciprocal rank (MRR) performance on two datasets, as well as aids in developing more efficient transliteration for named entities.

Friction Stir Processing of Cold-Sprayed High-Entropy Alloy Particles Reinforced Aluminum Matrix Composites: Corrosion and Wear Properties

Peng Han,Jia Lin,Wen Wang,Zhihao Liu,Yating Xiang,Ting Zhang,Qiang Liu,Xiaohu Guan,Ke Qiao,Yingchun Xie,Kuaishe Wang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3

The high-entropy alloy particles reinforced 6061Al composite was prepared by cold spray (CS) and then modified by frictionstir processing (FSP). The microstructure evolutions, corrosion, and wear behaviors of the composites were investigated. Results showed that numerous micro-pores and cracks were distributed in the Al matrix due to adiabatic shear instability andinsufficient deformation of the deposited particles for CSed samples. The average size of uniformly distributed HEA particleswas ~ 24 μm, and the geometric necessary dislocation (GND) density reached 17.1 × 1015m−2 due to large plastic deformationduring CS. Comparatively, the micro-pores and cracks were eliminated, and many fragmented HEA particles dispersed inthe Al matrix with an average size of ~ 4 μm for FSPed sample. Note that the GND density reduced to 9.8 × 1015m−2 due todynamic recrystallization during FSP. The formation rate of the oxide film was gradually greater than that of the dissolutionrate with the samples immersion in 3.5 wt% NaCl solution from 12 to 36 h, and the main corrosion mechanism was particledissolution around micro-pores and pitting for CSed and FSPed samples, respectively. In the polarization process, the FSPedsamples exhibited low corrosion tendency and high corrosion rate due to the dense and uniform microstructure, low GNDdensity, and dispersed HEA particles. The FSPed samples had better wear resistance than the CSed samples at 25 °C and200 °C. The dominant wear mechanisms of CSed and FSPed samples were abrasion at 25 °C, while the wear mechanismsof these samples were adhesion accompanied by abrasion at 200 °C.

Mechanical Properties of a Novel Modular Joint of Single-Layer Aluminium Alloy Lattice Shell

Caiqi Zhao,Yunwen Zhou,Gang Wang,Yating Wang,Haoyue Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3

To overcome the disadvantages of the discontinuous webs in the joint area of aluminium-alloy gusset joints and to further improve the efficiency of high-altitude positioning and installation of aluminium-alloy reticulated shell joints, this paper proposed a novel modular joint. Four sets of joint specimens were processed by computerized numerical control machine tools to carry out bearing capacity tests. The mechanical characteristics, failure mechanism and stiffness trends of this novel joint were explored. The results show that the proposed novel modular joints are significantly better than the traditional gusset joints in terms of bearing capacity and ductility. The flexural strength of the novel joints is 17% higher than that of the traditional gusset joints, and the novel joints have good deformability, which can prevent brittle failure. The results of elastoplastic finite element optimization analysis based on multiple contacts show that the theoretical failure mode and the curve of the load versus displacement of the joints are in good agreement with the actual measurements. Although the bearing capacity of the joints increases with increasing thickness of the modular unit and the reinforcement ring, when the thickness of the bottom plate exceeds twice the thickness of the top plate, this increase is very limited. Based on the working mechanism of the novel joints, a simplified calculation formula for their ultimate bearing capacity is proposed, which provides a theoretical basis for the engineering design and specification preparation of this type of joint henceforth.