A Comparative Study on the Insulation Ageing of 10 kV XLPE Cable via Accelerated Electrical Test and Accelerated Water Tree Test

Li Weiwei,Zheng Wenyue,Ren Lulu,Li Huan,Zhao Xuetong,Wang Can,Li Jianying 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1

Medium and high voltage XLPE cables were widely used in urban distribution network. The electric-thermal eff ect of the cable conductor and water in the running environment are two important factors that cause ageing of cable insulating material. In this work, accelerated electrical test (AET) and accelerated water tree test (AWTT) on 10 kV XLPE cable were carried out for 1440 h, 2880 h and 4320 h, respectively. The physicochemical and dielectric properties of both aged and unaged XLPE samples were tested. Physicochemical investigation of Fourier Transform Infrared (FTIR) spectroscopy and X-Ray Diff raction (XRD) show that higher carbonyl groups index, and lower crystallinity of the XLPE insulating materials were generated in AWTT process than that in AET process. The thermal decomposition process of the AWTT XLPE are complicated, presenting a multi-peak phenomenon in the diff erential thermogravimetry (DTG) curve. The insulating strength of the samples after AWTT is monotonically decreased from 23.03 kV to 21.74 kV with ageing time. The dielectric properties show that the permittivity and dielectric loss of AWTT samples increased more severely than that of AET samples, with a new dielectric relaxation peak appearing at around 100 Hz. The combination of physicochemical and dielectric results reveals that AWTT process leads to more serious degradation for XLPE insulating materials. A schematic illustration is given to elucidate the development of micro defects in XLPE during the AET and AWTT processes.

Sublethal and transgenerational effects of six insecticides on Bactrocera dorsalis (Hendel) (Diptera: Tephritidae)

Li Jianying,Liu Jin,Chi Baojie,Chen Peng,Liu Yongjie 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.2

To clarify the effects of sublethal concentration of insecticide on the growth, development and reproduction of Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), the sublethal and transgenerational effects of the LC 30 of six insecticides on adults and progeny (F 1 and F 2 generations) were studied using age-stage, two-sex life tables. Exposure to six insecticides had significant negative impacts on the life-history traits of B. dorsalis and led to reduced adult longevity and fecundity in F 0 , a longer larval stage duration in F 1 , and reduced fertility and survival. The intrinsic rate of increase (r), finite rate of increase (λ), and net reproductive rate (R 0 ) were reduced in F 1 , with the greatest reduction observed in the chlorpyrifos treatment. In the F 2 generation, the adverse effects were weakened, only the cyantraniliprole treatment had lower values than the control, and the fecundity of other treatments returned to normal. Obvious “hormesis” phenomena were not observed in any of the generations. Based on the population hazard index, chlorpyrifos had the best control effect in the early stage, and cyan traniliprole had the best control effect in the long term. These results indicate that the LC 30 of the six insecticides exert different transgenerational effects on the B. dorsalis population.

The Correlation between Thyrotropin and Dyslipidemia in a Population-based Study

Li Lu,Beibei Wang,Zhongyan Shan,Fengwei Jiang,Xiaochun Teng,Yanyan Chen,Yaxin Lai,Jiani Wang,Haibo Xue,Sen Wang,Chenyan Li,He Liu,Ningna Li,Jiashu Yu,Liangfeng Shi,Xin Hou,Qian Xing,Xue Bai,Weiping Te 대한의학회 2011 Journal of Korean medical science Vol.26 No.2

This study investigated the relationship between serum thyrotrophin levels and dyslipidemia in subclinical hypothyroid and euthyroid subjects. A total of 110 subjects with subclinical hypothyroidism and 1,240 euthyroid subjects enrolled in this study. Patients with subclinical hypothyroidism had significantly lower high density lipoprotein cholesterol (HDL-C) levels than those who were euthyroid. The lipid profiles were each categorized and mean thyrotrophin levels were higher in subjects in the dyslipidemia subclasses than subjects in the normal subclasses. Thyrotrophin was positively associated with serum triglyceride and negatively associated with serum HDL-C in women. Thyrotrophin was also positively associated with total cholesterol (TC) in the overweight population along with TC and LDL-C in overweight women. In the euthyroid population, thyrotrophin was positively associated with TC in the overweight population. In conclusion, serum thyrotrophin was correlated with dyslipidemia in subclinical hypothyroid and euthyroid subjects; the correlation was independent of insulin sensitivity.

山東琴書可持續性發展硏究

李建英 ( Li Jianying ) 인문사회과학예술융합학회 2019 인문사회과학예술융합학회지 Vol.3 No.2

山东琴书起源于鲁西南菏泽市, 距今已有280多年的历史, 具有典型的地域音乐特征, 其内容涉及音乐、文学、美学、民俗学、社会学等领域, 具有很高的学术价值和社会价值。因此, 本文以研究山东琴书可持续性发展为重点, 寻找解决策略, 对整个鲁西南曲艺传承与发展都具有借鉴意义。本文采用田野调查法、文献分析法、类比法、SWOT分析法等, 力求论点明确, 论据充分, 论证有力。山东琴书做为国家级非物质文化遗产, 具有传承优势, 菏泽学院将山东琴书开设为特色课程, 每年交流演出达30余场, 在吸纳高校在校生传承和创新这一传统的优秀非物质文化遗产方面做出了突出的贡献。随着时代的发展, 只是一味的传承创新艺术本体, 对于非遗本身来说, 没有起到从根本上解决传承难的问题, 引领山东琴书走向市场, 创造经济价值, 才会从根本上激发其传承活力。笔者依据SWOT分析结果和山东琴书生存环境现状, 提出了相应的解决策略。受众群体是山东琴书发展的生存土壤, 要想重现昔日辉煌, 必然要重新融入百姓生活, 在求新、求变中满足现代观众对传统文化的需求。如何让这一优秀的文化遗产保持充沛的活力, 走可持续性发展道路, 今后必须依托地方经济, 建立科学的市场运营机制, 产生经济效益, 传承方可久远。 Shandong Qinshu originated in Heze City, Southwest Shandong Province. It has a history of more than 280 years. It has typical regional music characteristics. Its content involves music, literature, aesthetics, folklore, sociology and other fields. It has high academic value and social value. Therefore, this paper focuses on the sustainable development of Qinshu in Shandong Province and seeks solutions, which can be used for reference for the inheritance and development of Southwest Shandong opera.In this paper, field investigation, literature analysis, analogy, SWOT analysis and so on are used to make the arguments clear, sufficient and powerful. Shandong Qinshu, as a national intangible cultural heritage, has the advantages of inheritance. Heze College has offered Shandong Qinshu as a characteristic course, with more than 30 exchanges and performances each year. It has made outstanding contributions to the inheritance and innovation of college students as a traditional excellent intangible cultural heritage. With the development of the times, only blindly inheriting and innovating the art noumenon, for the non-legacy itself, has not fundamentally solved the problem of inheritance difficulties, leading Shandong Qinshu to the market, creating economic value, will fundamentally stimulate its inheritance vitality. Based on the SWOT analysis results and the status quo of the living environment of Shandong Qinshu, the author puts forward corresponding solutions. Audience is the living soil for the development of Shandong Qinshu. To regain the glory of the past, it is necessary to re-integrate into the lives of the people, and to meet the needs of modern audiences for traditional culture in the pursuit of new and changing. How to keep this excellent cultural heritage ample vitality and take the path of sustainable development. In the future, we must rely on the local economy and establish a scientific market operation mechanism to generate economic benefits. The inheritance can last for a long time.

Zostera marina Seed Burial can be Enhanced by Manila Clam Ruditapes philippinarum: A Microcosm Study

Chang-Jun Li,Wen Tao Li,Jianying Liu,Xiu-mei Zhang,Peidong Zhang 한국해양과학기술원 2017 Ocean science journal Vol.52 No.2

Seagrass seed bank plays a key role in the regeneration of new vegetation when seagrasses are removed by the natural or man-made disaster. Various factors may affect the development of sediment seed bank. We conducted a microcosm experiment to test the effects of burrowing and feeding activities of Manila clam, Ruditapes philippinarum on the burial of Zostera marina seeds in sediments. The effects of lasting time (3-hour, 1-day, 3-day, 7-day, 14-day and 28-day), clam density (0, 2, 4 and 8 clams with shell length of 3 cm in each microcosm) and clam size (shell length of 2, 3 and 4 cm at 4-clam density) on seed burial were examined in plastic microcosm cores (30 cm high × 10 in inner diameter) in a 28-day period. Results showed that the seed burial depth significantly increased with time, the density and the size of clams. No seeds were buried in the sediment in the cores without clams during the whole experiment period. For the 3-cm clams, about 91.61% of the seeds were buried in the sediment at the end of the experiment in the high-density treatment (8 clams at each core); while in the medium and low-density treatments (4 and 2 clams in each core, respectively), about 76.93% and 60.61% of the seeds were buried in the sediment, respectively. For the size treatments, large (4 cm) clams buried 89.56% of the seeds at the end of the experiment, much more than those of medium (3 cm, 76.93%) and small (2 cm, 61.50%) size clams. During the whole experiment period, nearly all of the buried seeds were at a depth of from 0 cm to 5 cm. These results suggested that Manila clam Ruditapes philippinarum may play an important positive role in seagrass seed bank dynamics in the field.

Formation of [3]Catenanes from 10 Precursors via Multicomponent Coordination-Driven Self-Assembly of Metallarectangles

Li, Shijun,Huang, Jianying,Cook, Timothy R.,Pollock, J. Bryant,Kim, Hyunuk,Chi, Ki-Whan,Stang, Peter J. American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.6

<P>We describe the formation of a suite of [3]catenanes via multicomponent coordination-driven self-assembly and host–guest complexation of a rectangular scaffold comprising a 90° Pt-based acceptor building block with a pseudorotaxane bis(pyridinium)ethane/dibenzo-24-crown-8 linear dipyridyl ligand and three dicarboxylate donors. The doubly threaded [3]catenanes are formed from a total of 10 molecular components from four unique species. Furthermore, the dynamic catenation process is reversible and can be switched off and on in a controllable manner by successive addition of KPF<SUB>6</SUB> and 18-crown-6, as monitored by <SUP>1</SUP>H and <SUP>31</SUP>P NMR spectroscopy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-6/ja3118812/production/images/medium/ja-2012-118812_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja3118812'>ACS Electronic Supporting Info</A></P>

Heat transfer and friction characteristics in steam cooled rectangular channels with rib turbulators

Jianying Gong,Tieyu Gao,Guojun Li 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1

We studied the heat transfer and friction characteristics in steam-cooled rectangular channels with rib turbulators on W side or H sidewalls in the Reynolds number (Re) range of 10000-80000. Each of the test channels was welded by four stainless steel plates to simulatethe actual geometry and heat transfer structure of blade/vane internal cooling passage. The length of the channel L was 1000 mm, thecross section of the channel was 40 mm × 80 mm, and the pitch-to-rib height ratio p/e was kept at 10. The channel blockage ratio (W/H)was 0.047. Results showed that the Nusselt number (Nu) distributions displayed different trends at the entrance region with the increaseof Re for the rib turbulators on the W side walls. The heat transfer performance of the rib turbulators on the H side walls was about 24-27% higher than that on the W side walls at the same pumping power. In addition, semi-empirical correlations for the two cases, rib turbulatorson W side walls and rib turbulators on H side walls, were developed based on the heat transfer results, which could be used in thedesign of the internal cooling passage of new generation steam-cooled gas turbine blade/vane.

Development of polymorphic EST-SSR markers by sequence alignment in Frankliniella occidentalis (Pergande)

Jiani Liu,Zheng-Yue Li,Xiaoyan Chen,Heping Huang,Furong Gui 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3

The western flower thrips, Frankliniella occidentalis, is the most economically important agronomic pest withinThysanoptera because it is both a direct pest of horticulture crops and an efficient vector of plant viruses. Sixty-seven polymorphic SSR loci were identified in the contigs (containing redundant ESTs) generated byassembling 13,839 F. occidentalis ESTs from the public sequence database. Nineteen SSR markers exhibited polymorphismamong 860 samples from43 F. occidentalis populations,with alleles per SSR marker ranging fromtwoto eight, the effective number of alleles (Ne) range from 0.73 to 2.64; the observed (Ho) and expected (He) heterozygositiesranged from 0.09 to 0.77 and 0.12 to 0.96, respectively. The PIC values were from 0.24 to 0.73. AMOVA revealed most genetic variation resided within, rather than between, greenhouse and field isolates. The Mantel test showed no significant differences between genetic and geographical distances. We demonstratedthe value of mining the redundant sequences in public sequence databases for the development of polymorphicSSR markers, which can be used for better understanding population variation and spreading of the invasive pestF. occidentalis.

Lady General Mu Takes Command

Li Jiani 한국콘텐츠학회 2023 ICCC International Digital Design Invitation Exhib Vol.2023 No.5

Mesoscopic investigation of frost crystal nucleation on cold surface based on the lattice-Boltzmann method

Jianying Gong,Jianqiang Hou,Liangwei Yang,Weifeng Wu,Guojun Li,Tieyu Gao 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.4

A lattice Boltzmann method (LBM) two-dimensional (2D) mesoscopic model is presented for studying the frost crystal nucleation process involved in liquid-solid phase change on a cold surface. In order to make the simulation more realistic, the actual frost crystal nucleus deformation process is considered in this model. The simulation results agree well with our experimental results. Detailed analysis was made on the dynamic behavior of liquid-solid phase change and heat transfer happening in the frost crystal nucleation process. Results are presented for the evolution law of frost crystal nucleus deformation, dynamic solid-liquid phase change process as well as the dynamic distribution of frost nucleus interior temperature during frost crystal nucleation. In addition, the occurrence of frost crystal nucleus deformation is explained by the theory of crystal growth. Finally, where and why the initial position of frost crystal growth happens is also revealed. Furthermore, the reason why the hydrophobic surface can delay the droplet freezing and why the frost growth is faster on the hydrophobic surface after the droplet is frozen is analyzed based on this model.