Microstructures and Properties of Molybdenum Wire Doped with Minim La2O3

Li DaCheng,Bu Chunyang,Zhu Yong-An,Wang Jin 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

The microstructures and properties of pure molybdenum wire and Mo-La2O3 alloy wire annealed at different temperatures are investigated systematically in this paper. It is shown that the recrystallization temperature, toughness and strength at room temperature of this wire was increased greatly by addition of La2O3. The room temperature embrittlement of this wire annealed at high temperature is improved remarkably.

An Integrated Evaluation Method for the Grouting Effect in Karst Areas

Qing Jin,Zehua Bu,Dongdong Pan,Haiyan Li,Zhaofeng Li,Yichi Zhang 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.8

Our proposed integrated evaluation method for the grouting effect in karst areas is based on the cloud model (CM), the analytic hierarchical process (AHP), and a fuzzy comprehensive evaluation system. Our method fully considers the fuzziness and randomness of the evaluation indices, and bridges the gap between qualitative information and a quantitative evaluation value. The evaluation index system for the grouting effect is established by integrating metrics related to the construction technology, apparent parameters, and observational data from inspection holes and geophysical exploration techniques. First, the weight of each index is calculated using the AHP, which has been modified by the CM. Then, we calculate the cloud model membership degree for each index. Finally, we determine the comprehensive evaluation level by examining the similarity measures between the various cloud models. In this case study, we use our integrated method to evaluate the initial results of the grouting treatment project in the China Resources Cement (Pingnan) Limestone Mine. Our results are validated by subsequent monitoring results for this project. This study provides valuable insight into the treatment of water inflow in karst areas.

Study on the Mechanism of the Controllable Exciter with Super Low-Frequency for Oil Extraction

Yinong Li,Bang Chun Wen,Jin Zhi Li,Bu Zai Men 대한기계학회 1997 Asia-Pacific Vibration Conference Vol.2 No.1

Tidal Effect on Grouting in Karst Fracture with Flowing Water: Experimental Investigation and Its Application

Qing Jin,Zehua Bu,Dong-dong Pan,Xiaojie Gao,Pengshuai Yang,Haiyan Li,Zhaofeng Li,Zhenhao Xu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2

To address the problem on grouting control of water inflow disaster in coastal area, a caisson-type grouting experimental system of a single fracture in flowing water under tidal action was developed independently. Through the tide simulation system, the tidal action of different intensity and frequency was effectively described. Tide simulation system, fracture system, grouting system, water supply system and information monitoring system were combined to realize the visualization of the whole grouting process under tidal action. Furthermore, the grouting experiments of a plate fracture under different tidal action were developed and the blocking mechanism under tidal action was revealed. The conclusions were as follow: 1) Under constant water head, the slurry had three typical diffusion patterns, which were circular distribution, double U-shaped distribution and elliptical distribution respectively. 2) Under tidal action, the pressure showed a periodic fluctuation growth, and the growth rate slowed down with the increase of fracture aperture. 3) Strong tidal action would promote the diffusion of and increased the outflow amount of slurry, which was not conducive to grouting. Based on the water inflow treatment project of limestone mine in Guangxi, Through the field grouting tests, the 2# water inflow point was blocked. The research results have a certain reference value for the technology optimization of grouting engineering in coastal areas.

대기 중 PM2.5의 중금속 성분의 화학적 특성

전혜리(Hye-Li Jeon),최수현(Su-Hyeon Choi),임지영(Ji-Young Im),박희진(Hee-Jin Park),홍은주(Eun-Ju Hong),손부순(Bu-Soon Son) 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.3

Objectives: The changes in atmospheric PM2.5 concentrations were extensively studied in one metropolitan city (Incheon), two small and medium sized cities (Gunsan, Cheonan), and a rural area (Gosan in Jeju). The concentrations of heavy metals (Cr, Mn, Fe, Ni, Cu, Zn, Al, Pb) and the component features of PM2.5 were determined for these areas. Methods: This study sampled PM2.5 at the designated locations in the metropolitan (Incheon), small and medium sized cities (Gunsan in Jeonbuk and Cheonan in Chungnam), and rural area (Gosan in Jeju) to investigate concentrations with a sampling device (Sequential sampler, APM Eng., Korea). Sampling was undertaken over months, from June 26 to November 26, 2009. Sampling was conducted a total of 44 times, with routine sampling at intervals of six days (24 total times) and intensive sampling (20 total times) during the summer and fall. Mass concentration of PM2.5 was evaluated and the concentrations of heavy metals (Cr, Mn, Fe, Ni, Cu, Zn, Al, Pb) were analyzed. Results: The geometric average of concentrations of PM2.5 per district was 35.289 μg/m3 for Cheonan, 29.955 μg/m3 for Incheon, 24.119 μg/m3 for Gunsan, and 18.773 μg/m3 for Jeju, respectively. The average concentration of PM2.5 in Cheonan was the highest. The seasonal concentration distributions per district showed Cheonan 33.387 μg/m3, Incheon at 31.550 μg/m3, Gunsan 22.900 μg/m3, and Jeju 18.900 μg/m3 in the summer. For the autumn, the concentrations were 36.873 μg/m3 in Cheonan, 28.625 μg/m3 in Incheon, 25.227 μg/m3 in Gunsan, and 18.667 μg/m3 in Jeju. According to the collected data, the concentration showed a tendency to rise during the autumn in all of these regions with the exception of Incheon. For heavy metal distribution per district, Fe showed an elevated concentration during the summer while high concentrations of Pb and Zn occurred during the autumn. Conclusion: These results demonstrated that atmospheric factors affected the concentrations of heavy metals. The results of this study could be used as foundational data for setting environmental air standards focusing on a PM2.5 receptor.

Lateral channeling within rectangular arrays of cubical obstacles

Princevac, Marko,Baik, Jong-Jin,Li, Xiangyi,Pan, Hansheng,Park, Seung-Bu Elsevier 2010 Journal of wind engineering and industrial aerodyn Vol.98 No.8

<P><B>Abstract</B></P><P>Water channel experiments were conducted with the goal of obtaining better understanding of flows through urban-like arrays of buildings. Particle Image Velocimetry (PIV) was used for comprehensive flow measurements within a modeled simple urban setup. Building arrays were modeled using acrylic blocks whose refractive index is the same as that of salty water. Such a setup allowed for undisturbed laser sheet illumination through the obstacles enabling detailed flow measurements between the obstacles/buildings. Building array size, measurement plane and flow conditions were varied. A novel flow feature, lateral channeling, observed and quantitatively measured, within regular 3×3 and 5×5 arrays of cubes is reported here. A sideways mean outflow from the building array is observed behind the first row of buildings followed by the mean inflow in the lee of all succeeding rows of buildings. When the central building in a 3×3 array is replaced by a building of double height, due to the strong downdraft caused by this tall building, the lateral outflow becomes significantly more intense. When the central building in a 5×5 array is replaced by a building of double height, the building downdraft blocks the lateral inflow to the array. This is the first time that such detailed measurements are available for a mock urban array of finite size—a real three-dimensional case. The newly identified mean flow pattern may be accountable for the initial plume spread within an array of obstacles.</P>

Molecular identification and expression patterns of carboxylesterase genes based on transcriptome analysis of the common cutworm, Spodoptera litura (Lepidoptera: Noctuidae)

Ya Nan Zhang,Jin-Bu Li,Peng He,Liang Sun,Zhao-Qun Li,Li-Ping Fang,Zhan-Feng Ye,Dao-Gui Deng,Xiu-Yun Zhu 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.4

Carboxylesterases (CXEs) belong to a family of metabolic enzymes that are widely distributed in insects and other organisms and can rapidly degrade the components of sex pheromones and plant volatiles with an acetate functional group. The common cutworm, Spodoptera litura, is an important agricultural pest around the world, causing vast economic losses every year. The female sex pheromones of S. litura comprise four acetates, Z9, E11-14:OAc; Z9, E12-14:OAc; Z9-14:OAc; and E11-14:OAc, but the degradation mechanisms of these components are not well understood. By analysing previously obtained transcriptomic data of the sex pheromone glands,we identified a total of 24 putative CXE genes in S. litura. Gene expression patterns and phylogenetic analysis revealed 5 genes with antennae-specific or biased expression, and clusteredwith genes showed involvement in the degradation of sex pheromones or other detoxification in other insects. SlitCXE10was expressed specifically in the antennae of both sexes, and SlitCXE14, 17, 19, and 21 had high antenna biased expression. Interestingly, RT-PCR and qPCR tests indicated that SlitCXE24 had significantly higher expression in PG than in other tissue, and that it could be a potential candidate gene for sex pheromone degradation in PG. This study is the first to provide solid background information for the further elucidation of sex pheromone degradation, and ultimately provides potential targets for the disruption of sexual communication in S. litura for new pest management.

Fangchinoline Inhibits Cell Proliferation Via Akt/GSK-3beta/cyclin D1 Signaling and Induces Apoptosis in MDA-MB-231 Breast Cancer Cells

Wang, Chang-Dong,Yuan, Cheng-Fu,Bu, You-Quan,Wu, Xiang-Mei,Wan, Jin-Yuan,Zhang, Li,Hu, Ning,Liu, Xian-Jun,Zu, Yong,Liu, Ge-Li,Song, Fang-Zhou Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.2

Fangchinoline (Fan) inhibits cell proliferation and induces apoptosis in several cancer cell lines. The effects of Fan on cell growth and proliferation in breast cancer cells remain to be elucidated. Here, we show that Fan inhibited cell proliferation in the MDA-MB-231 breast cancer cell line through suppression of the AKT/Gsk-3beta/cyclin D1 signaling pathway. Furthermore, Fan induced apoptosis by increasing the expression of Bax (relative to Bcl-2), active caspase 3 and cytochrome-c. Fan significantly inhibited cell proliferation of MDA-MB-231 cells in a concentration and time dependent manner as determined by MTT assay. Flow cytometry analysis demonstrated that Fan treatment of MDA-MB-231 cells resulted in cell cycle arrest at the G1 phase, which correlated with apparent downregulation of both mRNA and protein levels of both PCNA and cyclin D1. Further analysis demonstrated that Fan decreased the phosphorylation of AKT and GSK-3beta. In addition, Fan up-regulated active caspase3, cytochrome-c protein levels and the ratio of Bax/Bcl-2, accompanied by apoptosis. Taken together, these results suggest that Fan is a potential natural product for the treatment of breast cancer.

일반대기 중 극미세입자와 중금속 농도에 관한 연구

조태진,전혜리,윤형선,이미영,손부순,Cho, Tea-Jin,Jeon, Hye-Li,Youn, Hyung-Sun,Lee, Mi-Young,Son, Bu-Soon 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.6

This study evaluated the distribution of the concentrations of nano-particles and heavy metals (08-Pb, Cr, Zn, As, Fe, 09-Pb, Cr, Zn, Cu, Ni, Mn) in Seoul, Chungnam A and Gwangyang from August to December, in 2008 5 times each in the Seoul area, 5 times in and Chungnam A area and from August to November, in 2009 14 times in the Chungnam A area, 8 times in the Gwangyang area. The examined results showed high concentration level from $PM_1$ through $PM_{0.1}$ in all three areas. These results were obtained the concentration of particles by diameter and statistically significant in Stage5 (1.0-0.56 ${\mu}m$) from the result of conducting Kruskal-Wallis H test (p < 0.05). In the case of the heavy metal concentration included in 0.10-0.056 ${\mu}m$, 0.056 ${\mu}m$, the lead concentration of Chungnam Asan area was 6.49 ng/$m^3$ and 9.93 ng/$m^3$, which was higher than 3.05 ng/$m^3$ and 4.22 ng/$m^3$ of Seoul, respectively. The concentration of iron in Seoul was 9.28 ng/$m^3$ and 13.24 ng/$m^3$, that appeared higher than 2.38 ng/$m^3$ and 3.23 ng/$m^3$ of Chungnam A area, respectively. The concentration level was similar to other metals except lead and iron in Chungnam A area and Seoul. From the concentration of heavy metal included in 0.10-0.056 ${\mu}m$, 0.056 ${\mu}m$, the lead concentration of Chungnam A area was 0.31 ng/$m^3$ and 0.12 ng/$m^3$ while Gwangyang was 0.28 ng/$m^3$, 0.06 ng/$m^3$. Thus Chungnam A area showed higher lead concentration than Gwangyang. The manganese concentration of Chungnam A area was 0.12 ng/$m^3$ and 0.03 ng/$m^3$ while Gwangyang was 0.21 ng/$m^3$ and 0.08 ng/$m^3$. Therefore, the concentration of Gwangyang appeared higher than that of Chunnam A area. These two metals showed statistically significant in 0.056 ${\mu}m$ (p < 0.05, p < 0.01). Among the concentration of heavy metal in all regions, the result demonstrated that the order of higher concentration is arsenic > iron > zinc > chrome > lead > nickel > copper > manganese.

전남지역 일부 대학생 모발 중 수은 농도에 관한 연구

송미라,조태진,전혜리,김종오,손부순,Song, Mi-Ra,Cho, Tae-Jin,Jeon, Hye-Li,Kim, Jong-O,Son, Bu-Soon 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.4

This study analysed the mercury concentration in the hair of 62 students (male : 21, female : 41) of D university in Najusi, Jeon-Nam area. Also, questionnaire, which developed by NIES, were completed by the students. According to the questionnaire, most of the students had a higher intake of meat than that of fish. Also, among the students, there were many smokes and many had dental treatment with amalgam. Based on the gender, female showed 1.024 ${\mu}g/g$ and male showed 0.882 ${\mu}g/g$ of the mercury concentration. This means that female students had higher level of mercury in their hair, but it was not a significant statistic difference. Comparing by the intake frequency of meat, processed food stuffs, protein foods, it shows the more they at the higher mercury concentration was observed. According to the intake frequency of fish, when the number of times they intake increased, the mercury concentration was higher. Under one time was 0.857 ${\mu}g/g$ and twice or more times were 1.152 ${\mu}g/g$, which showed a significant statistical difference (p<0.05). Depending on the Life style, the mercury concentration in the hair was high with workout, outdoor activities, and direct smoking. The mercury concentration in the hair showed no difference for whether they received amalgam treatment but the personal dietary habit and the Living condition affects strongly on the mercury concentration level.