1,022 research outputs found
Crosslinking Dependence of Direct Current Breakdown Performance for XLPE-PS Composites at Different Temperatures
No full textIn this paper, crosslinked polyethylene-polystyrene (XLPE-PS) composites with different degrees of crosslinking were fabricated by using different crosslinking agent contents and their direct current (DC) breakdown performance at 30~90 °C was investigated. Results show that with the increase of the degree of crosslinking, the crystallinity of XLPE-PS composites decreases gradually, but their DC breakdown strength demonstrates an increasing trend at 30~90 °C and the enhancement also increases with the rise of temperature. And as the degree of crosslinking increases, the elastic modulus of XLPE-PS composites is reduced and the loss tangent peak temperature decreases but the peak shifts to a lower value, which reveals the suppression of the relaxation process for crystallites. It is believed that high DC breakdown strength with good temperature stability for XLPE-PS composites with a larger degree of crosslinking is attributable to the presence of PS and suppression in the formation of crystallites due to crosslinking
Supplemental material for The Comparation of Intraperitoneal Injection and Nasal-only Delivery Allergic Rhinitis Model Challenged With Different Allergen Concentration
No full textSupplemental Material for The Comparation of Intraperitoneal Injection and Nasal-only Delivery Allergic Rhinitis Model Challenged With Different Allergen Concentration by Ying Wang, Yue Zhou, Yun Zhu, Wenting Yu, Jinghui Wang, Junmei Fu, Yang Yuan, Zizhong Yu, Shan Chen, Yanjun Wang, Jianjun Chen and Weijia Kong in American Journal of Rhinology & Allergy</p
suppliment_document_tables12.4_cs – Supplemental material for Further Validation of the Inventory of Callous–Unemotional Traits in Chinese Children: Cross-Informants Invariance and Longitudinal Invariance
No full textSupplemental material, suppliment_document_tables12.4_cs for Further Validation of the Inventory of Callous–Unemotional Traits in Chinese Children: Cross-Informants Invariance and Longitudinal Invariance by Meng-Cheng Wang, Yiyun Shou, Jinghui Liang, Hongyu Lai, Hong Zeng, Lina Chen and Yu Gao in Assessment</p
Temperature dependence of crystalline structure and DC performance in LLDPE/HDPE blending material
No full textThermoplastic blending material is considered as a recyclable environmental-friendly potential candidate for future direct current (DC) cable insulation. Although such a non-crosslinking material has been proved to be superior in certain properties compared with cross-linked polyethylene (XLPE), one of the central concerns for the application of this material system lies in its DC performance at high temperature. In this paper, we investigate the DC conductivity and breakdown strength of a thermoplastic linear low-density polyethylene (LLDPE)/high-density polyethylene (HDPE) blending material under temperature range from 30 to 90℃, the results show that this blend exhibits better temperature-stability in DC performance, and it shows lower conductivity and higher breakdown strength compared with XLPE. The crystalline structure is studied through X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that the LLDPE/HDPE blend exhibits a co-crystalline structure with higher crystallinity and larger microcrystal, and when temperature rising, crystallinity and microcrystal size of blend decreases slower compared with XLPE. Such results might enable further application of the LLDPE/HDPE blend on DC cable insulation
Enhanced high-temperature DC dielectric performance of crosslinked polyethylene with a polystyrene pinning structure
No full textIn this paper, we propose a method on improving direct current (DC) dielectric performance by designing a polystyrene (PS) pinning crosslinked polyethylene (XLPE) for the application of insulation materials on high voltage direct current (HVDC) extruded cable. Electrical experimental results show that the addition of PS (1-5 phr, parts per hundreds of resin) can significantly reduce DC conductivity and increase DC breakdown strength of XLPE in the test temperature range of 30-90 °C. Microstructure investigation shows PS distributed as particles could participate in the formation of a crosslinking network with the help of a crosslinking agent, thus forming a polymer pinning structure at the interface between XLPE and PS. It is believed that such a special design strengthens the structure of XLPE, which leads to the improved DC dielectric performance at elevated temperatures. Our findings may contribute a new solution for developing HVDC cable insulation materials.</p
Crosslinking-modulated direct-current conductivity of XLPE-PS composite via charge trap characteristics
No full textLow direct-current (DC) conductivity is one of the most desired characteristics for crosslinked polyethylene (XLPE) as a high-voltage DC cable insulation material. In this Letter, a correlation between the DC conductivity and cross-linking characteristics of XLPE-polystyrene (PS) composites at 50 C was studied. Experimental results show that by adjusting the cross-linking structure, different trap distribution characteristics for XLPE-PS composites were realized. With the increase in the cross-linking agent content, DC conductivities of XLPE-PS composites tend to decrease, and the introduced average trap depth increases correspondingly. An increase of 0.07 eV for average charge trapdepth in XLPE-PS composites could be acquired in the test range. It is considered that the increase in the average trap depth reduces the carrier mobility, contributing to the reduction of DC conductivity for XLPE-PS composites. Thus, the DC conductivity and average trap depth of XLPE composites show a strong relevance. The results suggest that the interaction between PS particles and the matrix introduced by cross-linking plays a dominant role in determining the charge conduction for XLPE-PS composites
Design of pH-Responsive Nanomaterials Based on the Tumor Microenvironment
No full textYunheng Liu,1,* Longqing Si,1,* Yuxuan Jiang,1,* Shaojing Jiang,2 Xiaokang Zhang,1 Song Li,1 Jing Chen,1 Jinghui Hu2 1School of Pharmacy, The Key Laboratory of Prescription Effect and Clinical Evaluation of State Administration of Traditional Chinese Medicine of China, Binzhou Medical University, Yantai, 264003, People’s Republic of China; 2Yantai Engineering Research Center for Digital Technology of Stomatology, Characteristic Laboratories of Colleges and Universities in Shandong Province for Digital Stomatology, Institute of Stomatology, Binzhou Medical University, Yantai, 264003, People’s Republic of China*These authors contributed equally to this workCorrespondence: Jing Chen, School of Pharmacy, The Key Laboratory of Prescription Effect and Clinical Evaluation of State Administration of Traditional Chinese Medicine of China, Binzhou Medical University, Yantai, 264003, People’s Republic of China, Email [email protected] Jinghui Hu, Yantai Engineering Research Center for Digital Technology of Stomatology, Characteristic Laboratories of Colleges and Universities in Shandong Province for Digital Stomatology, Institute of Stomatology, Binzhou Medical University, Yantai, 264003, People’s Republic of China, Email [email protected]: The metabolic activity of tumor cells leads to the acidification of the surrounding microenvironment, which provides new strategies for the application of nanotechnology in cancer therapy. Researchers have developed various types of pH-responsive nanomaterials based on the tumor acidic microenvironment. This review provides an in-depth discussion on the design mechanisms, drug-loading strategies, and application pathways of tumor acidic microenvironment-responsive nanodrug delivery systems. These materials trigger drug release upon reaching the tumor microenvironment, enhancing therapeutic targeting and reducing toxicity to healthy cells. pH-responsive nanomaterials include organic nanomaterials, inorganic nanomaterials, and composite nanomaterials. Additionally, this review outlines the drug-loading strategies, application prospects, and challenges of pH-responsive nanomaterials, aiming to promote the development and clinical translation of this field.Keywords: tumor microenvironment, pH response, nanocarriers, drug-loading strategies, drug delivery syste
Coercivity enhancement in Dy-free sintered Nd-Fe-B magnets by effective structure optimization of grain boundaries
No full textIn this study, we presented an effective approach for the substantial coercivity enhancement of Dy-free sintered Nd-Fe-B magnets with Ga-doping. The coercivity was substantially enhanced from 10.1 kOe to 19.8 kOe by effective microstructure optimization and phase constitution regulation in antecedent alloys. A good isolation of 2:14:1 grains by Nd-rich intergranular phase is obtained in final magnets accompanying with the formation of intermetallic Nd6Fe13Ga phase. However, when dehydrogenating above 500 degrees C, masses of preformed Nd6Fe13Ga phases are detected in the initial strip casting alloys and the homologous magnet suffers an unanticipated degradation of coercivity. Magnetic domain observation and thermal magnetic analysis imply a pronounced difference in the magnetism of grain boundary (GB) phases, which closely associated with the composition homogeneity of Nd-rich phases in antecedent alloys. The mechanism of the coercivity variation in the sintered magnets with different GBs magnetism is discussed based on magnetic behavior analysis. (C) 2017 Elsevier B.V. All rights reserved
Pekin Xalq Siyasi Məşvərət Şurasının nümayəndə heyəti “Dünya” məktəbində
No full textOn November 3, 2023, a delegation of the Beijing People's Political Consultative Conference visited the "Dunya" school. The delegation led by the Vice Chairman of the Council Zhang Jiaming included Deputy Secretary General of the Council, Head of the Research Department Chen Xu, Deputy Secretary General of the Council, Head of the Personnel and Communications Department Yang Jinghui, Head of the Council's Education, Health, Physical Education, Culture, Literature and History Committee. They included Chen Dong, Vice-Chairman of the Council's Jiangnan, Macao, Taiwan, Immigrants and Foreign Policy Affairs Committee Zhang Likun, and a staff member of the Beijing Foreign Affairs Office Chen Jingmin. The delegation was accompanied by staff members of the Chinese embassy in Azerbaijan, Su Tsin and Xie Yilin
Highly efficient Tb-utilization in sintered Nd-Fe-B magnets by Al aided TbH2 grain boundary diffusion
No full textAl aided TbH2 grain boundary diffusion (GBD) was applied to sintered Nd-Fe-B magnet in comparison with the TbH2 GBD magnet. The coercivity was enhanced from 13.73 kOe to 23.29 kOe, higher than the 22.26 kOe of TbH2 GBD magnet. The Tb content in the bulk magnet was reduced to 0.47 wt%, much lower than the 1.85 wt% of the TbH2 GBD magnet. Microstructure analysis showed that continuous grain boundary phases were formed and completely enveloped the grains with thin Tb-rich shells, which can be attributed to the reduced Tb content in diffusion source and the promoted GBD aided by Al. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
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