회수수에 처리되는 당류계 안정화제의 혼입률 변화가 콘크리트의 품질에 미치는 영향

文學龍,金虎林,우종완,한민철,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

The objective of present paper is to investigate the engineering properties of concrete using recycling water incorporating saccharic based stabilizing agent in order to improve qualities of concrete in the region of normal strength and high strength. According to test results, fluidity and air content do not exhibit significant difference with an increase in stabilizing agent contents. Bleeding was not observed at 30% of W Ie, regardless of stabilizing agent contents, nonetheless, concrete with stabilizing agent of 0.15% was observed to occur the least bleeding at 40 and 50% of W IC. For setting time, although presence of recycled water accelerates setting time, setting time shows to be retarded gradually with an increase in stabilizing agent content. For compressive strength, use of stabilizing agent enhanced compressive strength of concrete compared with that of concrete without stabilizing agent. In the side of strength enhancement, adequate dosage of stabilizing agent is found to be 0.15%. As dosage of stabilizing agent increased above 0.15%, drying shrinkage exhibited a tendency to decrease.

Anisotropic In-plane Resistivity and Magnetoresistance of the Detwinned BaFe2As2

Lin Jiao,Zong Fa Weng,Xue Yan Tang,Lu Kai Guo,Tian Shang,Lin Yang,Hui Qiu Yuan,Yu Ying Wu,Zheng Cai Xia 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3

We have measured the electrical resistivity and the magnetoresistance of detwinned BaFe2As2single crystals in fields up to 16 Tesla. The temperature dependence of the resistivity shows acounterintuitive anisotropic behavior in the ab-plane, likely arising from the effect of the nematicsusceptibility. Little magnetoresistance is observed at temperatures above the structural/magnetictransition, below which a huge in-plane magnetoresistance with an anisotropy is detected.

Designing Fault-Tolerant Photovoltaic Systems

Xue Lin,Yanzhi Wang,Pedram, Massoud,Jaemin Kim,Naehyuck Chang IEEE Computer Society 2014 IEEE design & test Vol.31 No.3

<P>PV systems are subject to PV cell faults, which lower the output power and shorten the lifespan of the system. This paper presents the design principles and runtime control algorithms of a fault-tolerant PV system which can detect and bypass PV cell faults in situ without any manual interventions.</P>

A re-examination of the current design rule for staggered bolted connections

Xue-Mei Lin,Michael C. H. Yam,Ke Ke,Binhui Jiang,Qun He 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.3

This paper summarised and re-examined the theoretical basis of the commonly used design rule developed by Cochrane in the 1920s to consider staggered bolt holes in tension members, i.e., the s 2 /4g rule. The rule was derived assuming that the term two times the bolt hole diameter (2d0) in Cochrane’s original equation could be neglected, and assuming a value of 0.5 for the fractional deduction of a staggered hole in assessing the net section area. Although the s 2 /4g rule generally provides good predictions of the staggered net section area, the above-mentioned assumptions used in developing the rule are doubtful, in particular for a connection with a small gauge-to-bolt-hole diameter (g/d0) ratio. It was found that the omission of 2d0 in Cochrane’s original equation appreciably overestimates the net section area of a staggered bolted connection with a small g/d0 ratio. However, the assumed value of 0.5 for the fractional deduction of a staggered hole underestimates the staggered net section area for small g/d0 ratios. To improve the applicability of the above two assumptions, a modified design equation, which covers a full range of g/d0 ratio, was proposed to accurately predict the staggered net section area and was validated by the existing test data from the literature and numerical data derived from this study. Finally, a reliability analysis of the test and numerical data was conducted, and the results showed that the reliability of the modified design equation for evaluating the net section resistance of staggered bolted connections can be achieved with the partial factor of 1.25.

Protective mechanism of fdft1 in steroid hormone synthesis pathway in SD rats with acute hypoxic injury

Xue Lin,Haiyan Wang,Xiaoyan Pu 한국유전학회 2020 Genes & Genomics Vol.42 No.11

Background The acute hypoxic injury caused by the plain population entering the plateau in a short period of time hasbecome the main cause of endangering the health of the people who rush into the plateau. Objective The study aimed to identify the key genes which participate in resisting the acute hypoxic injury in SD Rats bytranscriptomic profile analysis. Methods 48 Sprague Dawley (SD) male rats were enrolled and randomly divided into four groups (0h, 24h, 48h, 72h) andhoused in hypobaric hypoxia chamber with altitude 6000m for different periods of time to make them acute hypoxic injury. The transcriptomic profile of the lung tissue of the rats was analysed by RNA second-generation sequencing combined withbioinformatics analysis. Results The results of GO and KEGG function classification analysis revealed that the differential expression genes enrichedin steroid hormone synthesis pathway especially in 48h group compared to F0 group. Further analysis revealed that FarnesylDiphosphate Farnesyl Transferase 1 (fdft1) gene encoding a rate-limiting enzyme in steroid hormone synthesis pathway wassignificant differently expressed between the groups. The expression levels of fdft1 gene were further verified by RT-PCRand Western-blot methods. Conclusions The results suggest that fdft1 gene plays an important role in responding to acute hypoxic injury by regulatingsteroid hormone biosynthesis.

Concurrent Task Scheduling and Dynamic Voltage and Frequency Scaling in a Real-Time Embedded System With Energy Harvesting

Lin, Xue,Wang, Yanzhi,Chang, Naehyuck,Pedram, Massoud IEEE 2016 IEEE transactions on computer-aided design of inte Vol.35 No.11

<P>Energy harvesting is a promising technique to overcome the limit on energy availability and increase the lifespan of battery-powered embedded systems. In this paper, the question of how one can achieve the prolonged lifespan(1) of a real-time embedded system with energy harvesting capability (RTES-EH) is investigated. The RTES-EH comprises a photovoltaic (PV) panel for energy harvesting, a supercapacitor for energy storage, and a real-time sensor node as the embedded load device. A global controller performs simultaneous optimal operating point tracking for the PV panel, state-of-charge (SoC) management for the supercapacitor, and energy-harvesting-aware real-time task scheduling with dynamic voltage and frequency scaling (DVFS) for the sensor node, while employing a precise solar irradiance prediction method. The controller employs a cascaded feedback control structure, where an outer supervisory control loop performs real-time task scheduling with DVFS in the sensor node while maintaining the optimal supercapacitor SoC for improved system availability, and an inner control loop tracks the optimal operating point of the PV panel on the fly. Experimental results show that the proposed global controller lowers the task instance drop rate by up to 63% compared with the baseline controller within the same service time (i.e., from sunrise to sunset).</P>

Hydrothermal Synthesis and Photocatalytic Performance of Ag Quantum Dots Sensitized Bi4Ti3O12 Nanobelts

Xue Lin,Xiaoyu Guo,Di Liu,Qingwei Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.2

Ag/Bi4Ti3O12 heterostructure with high photocatalytic activity was synthesized via a simple and practical hydrothermal method by using Bi4Ti3O12 nanobelts as substrate materials. The as-prepared Ag/Bi4Ti3O12 heterostructure included Ag quantum dots assembling uniformly on the surface of Bi4Ti3O12 nanobelts. Comparing with pure Bi4Ti3O12 nanobelts, the composite photocatalyst exhibited enhanced photocatalytic activity under visible light irradiation in the decomposition of rhodamine B aqueous solution. The enhancement performance is believed to be induced by the intimate contact interface, where silver quantum dots serve as good electron acceptor for facilitating quick photoexcited electron transfer and thus decreasing electron-hole recombination. It was also found that the photodegradation of rhodamine B molecules is mainly attributed to the oxidation action of the generated O2 radicals.

The high Curie temperature and long-range ferromagnetism in Mn-doped 3C-SiC: a study using first-principles calculation

Lin Xue-ling,Zhang He-xiang,Yang Wei-xia,Chen Huan-ming,Pan Feng-chun 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.6

Magnetic semiconductors with high Curie temper (TC) and inherent ferromagnetism, which not only provide a data-processing function via semiconductors’ properties, but also offer a data-storage function through intrinsic ferromagnetism, have become key materials in the field of spintronics. We studied the electronic structures and magnetic properties of Mn-doped cubic (3C) SiC using first-principles calculation. The calculated results revealed that MnSi and MnC substitutions can introduce 3 μB and 1 μB magnetic moments into SiC, respectively, which are both localized and extended. The extended tails of the moments indicate a significant spatial extension of the spin-polarized electron states. The interaction between the long tails, which can mediate long-range ferromagnetic (FM) coupling up to 8.55 Å, and is very different from common exchange, in which the ferromagnetism decreases sharply with increasing distance between the moments, and is hard to maintain to the next-neighbor order due to the limited spatial spin-electrons distribution. The distributions of magnetic moments become more and more localized or extended as compressive or tensile strains are increased, but FM interactions under compressive and tensile strains are weaker than those in undeformed structure. The FM coupling mechanism is explained and discussed in detail using p–d electron exchange. These results can provide a routine for engineering FM semiconductor of 3C-SiC.

Morphology Characterization and Mechanism Analysis of the Microstructure of LiNbO3 Crystals Fabricated by Using Focused Ion Beam Milling

Xue-Lin Wang,Peng Liu,Qing Huang,Xue-Feng Xu,Sha Yan 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4

This paper reports the basic results obtained from an investigation of the microstructure of lithium niobate (LiNbO3) crystals fabricated by using the focused ion beam (FIB) sputtering method. The morphology characterization of the microstructure is explained in terms of scanning electron microscopy observations based on the geometrical integrity, surface smoothness, cross-sectional area, aspect ratio, etc. The optimized micro-fabrication conditions and the sample morphology characterization are presented, and the sputtering rate of Ga ions for a 30-keV energy milling of the LiNbO3 crystal is calculated, which is lower than the theoretical one gained from “The Stopping and Range of Ions in Matter” (SRIM) sputtering simulation due to the redeposition effect being enhanced with increasing milling depth

Different fates of oocytes with DNA double-strand breaks in vitro and in vivo

Lin, Fei,Ma, Xue-Shan,Wang, Zhen-Bo,Wang, Zhong-Wei,Luo, Yi-Bo,Huang, Lin,Jiang, Zong-Zhe,Hu, Meng-Wen,Schatten, Heide,Sun, Qing-Yuan Taylor Francis 2014 Cell Cycle Vol.13 No.17