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Deli Jia,Xiaohan Pei,He Liu,Fuchao Sun,Mingxin Zhao 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
Integrated separate layer water injection technology is an effective approach to reduce the workload of injection oilfield. The primary equipment which consists of flowmeter, motor and control value is placed underground for a long time. Injection rate allocation fault diagnosis is a problem with character of multiformity. The fault symptoms and reasons are random, and it is hard to differentiate them. Weighted fuzzy C-means clustering algorithm combining symptoms signals and fuzzy mathematics approach is used on the technology. The algorithm is based on fuzzy C-means clustering algorithm, and increase weight to each fault sample to reduce the impact of samples on fault classifications. Simulation and analysis illustrates that the algorithm is able to reflect the real structure of the sample data. And it improves the accuracy of fault classification.
Deli Jia,Xiaohan Pei,He Liu,Caihao Cui,Yong Yu,Meiqi Liu 보안공학연구지원센터 2014 International Journal of Smart Home Vol.8 No.6
In order to optimize the technological process of the water distributor and do further sturdy about the interference pattern of the injection layers in China, we needs reasonable and reliable methods to obtain the dynamic parameters of water injection layers. In this paper, a novel DC power line carrier technology based on the Orthogonal Frequency Division Multiplexing (OFDM) technology is proposed, aiming to save the difficult communication problem between the underground and the surface. Using the signals on the power line, it includes the modulation and demodulation techniques and filter encoding technology to transmit the data. Experimental results show that this new communication technology has high noise resistance and low error rate, provides reliable technology support and data to optimize the injection process and build the model of the dynamic parameters change among all the layers.
The Specific Case Analysis of Biomineralization Induced by Sulfate Reducing Bacteria
( Hongwei Liu ),( Shuang Qin ),( Chaoyang Fu ),( Fei Xiao ),( Deli Wang ),( Xia Han ),( Tianli Wang ),( Hongfang Liu ) 한국부식방식학회(구 한국부식학회) 2017 Corrosion Science and Technology Vol.16 No.6
The effects of sulfate reducing bacteria (SRB) on the corrosion and scaling of the Q235 carbon steel has been investigated in the simulated sewage water and oil field gathering pipelines production water, using scanning electron microscopy (SEM), energy dispersive x-ray spectrometry (EDS), and three-dimensional stereoscopic microscope. Results indicated that the concentration of SRB reached the maximum value on the ninth day in simulated sewage water with a large amount of scaling on the surface of specimen. In oil field gathering pipelines, a large amount of scaling and mineralization of mineral salts and thick deposition of extracellular polymeric substance (EPS) layers were also observed on the surface of specimen. The thickness of biofilm was about 245 μm within 30 days. After adding microbicides, the thickness of corrosion products film was only up to 48 - 106 μm within 30 days, suggesting that SRB could induce biomineralization. Under-deposit corrosion morphology was uniform in the absence of microbicides while local corrosion was observed in the presence of microbicides.
Shengai Cui,Deli Xu,Pin Liu,Yuezhong Ye 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
To solve the problem on the serious loss of bond strength of shotcrete in hot and dry environments, the measures for improving the bond strength were explored by mixing mineral admixtures or fiber materials into shotcrete mixture. The bond strengths between shotcrete and rock in hot and dry environments were measured by splitting method, and macroscopic, mesoscopic and microscopic analyses were carried out on shotcrete specimens. The results show that: in hot and dry environments, the bond strengths all decrease when mixed with mineral admixtures, and especially for the fly ash, with which the bond strength of shotcrete decreases by 36.7%. Mixing polypropylene fibers into shotcrete makes its bond strength decrease by 10.2%, but for steel fibers, it will be improved by 41.8% compared with basic mix proportion. Moreover, according to submicroscopic measurement and microscopic analysis, the influence mechanisms of mineral admixtures and fiber materials have been explored to some extent. Therefore, it’s feasible and effective to improve the bond strength by adding steel fibers in hot and dry environment.
Yuzhu Zheng,Deli Xu,Shiyou Tian,Manli Li,Wenwen Wang,Ke Liu 한국의류학회 2021 Fashion and Textiles Vol.8 No.1
In this work, graft copolymer poly (n-butyl acrylate)-g-polyacrylonitrile with poly (n-butyl acrylate) as backbones and polyacrylonitrile as side chains (PnBA-g-PAN) was synthesized by macromonomer method and emulsion polymerization. The macromonomer was synthesized by atom transfer radical polymerization and end-group modification. The chemical structures and thermal properties of macromonomer and graft copolymer were investigated by FTIR, GPC, NMR and TGA, etc. The mechanical properties of graft copolymer elastomer was also measured by uniaxial tensile test. Rheological properties at different temperature and mechanical property demonstrated that graft copolymer elastomer possessed elasticity until 180 oC because of cyclization of cyano groups. Ag nanowires@PnBA-g-PAN composite elastomer was developed, and the resulted material exhibited autonomic healing property on account of segments’ flexibility and dynamic interaction between Ag nanowires (AgNWs) and cyano groups. This is a general method for generation of elastomer with high temperature elasticity and fast self-healing. The composite elastomer has potential application in flexible electronic conductor.
Derui Zhu,Jian Liu,Rui Han,Guoping Shen,Qifu Long,Xiaoxing Wei,Deli Liu 한국미생물학회 2014 The journal of microbiology Vol.52 No.2
The moderately halophilic bacterium Halomonas sp. QHL1was identified as a member of the genus Halomonas by 16SrRNA gene sequencing. HPLC analysis showed that strainQHL1 synthesizes ectoine in its cytoplasm. The genes involvedin the ectoine biosynthesis pathway were identifiedon the chromosome in the order ectABC. Subsequently, theectB gene from this strain was amplified by PCR, and theentire ectABC gene cluster (3,580 bp) was cloned using genomewalking. Analysis showed that the ectA (579 bp), ectB(1269 bp), and ectC (390 bp) genes were organized in a singletranscriptional unit and were predicted to encode threepeptides of 21.2 kDa, 46.4 kDa, and 14.7 kDa, respectively. Two putative promoters, a δ70-dependent promoter and aδ38-controlled promoter, as well as several conserved motifswith unknown function were identified. Individual ectA, ectB,and ectC genes, and the entire ectABC gene cluster were insertedinto the expression plasmid pET-28a(+) to generatethe recombinant plasmids pET-28a(+)-ectA, pET-28a(+)-ectB, pET-28a(+)-ectC and pET-28a(+)-ectABC, respectively. Heterologous expression of these proteins in Escherichiacoli BL21 (DE3) was confirmed by SDS-PAGE. The recombinantE. coli strain BL21 (pET-28a (+)-ectABC) displayeda higher salt tolerance than native E. coli cells but producedfar less ectoine than the wild-type QHL1 strain.
Jingjing Lin,Song Yan,Xiaojie Zhang,Yueran Liu,Jun Lian,Hualin Lin,Wei Wei,Deli Lu,Sheng Han 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
Holey Fe-Anderson-type polyoxometalate/polyaniline/graphene (PPG) hybrid materials were first prepared by anchoring Anderson-type polyoxometalates [FeMo6O24H6]3- (FeMo6) onto graphene modified with polyaniline via a facile hydrothermal treatment. The as-prepared materials exhibited an excellent electrochemical performance with a high specific capacitance of 1366 F g -1 at 1 A g -1 and outstanding cycling stability (97.6% capacitance retention after 5000 cycle times). The uptake of polyaniline/FeMo6 nanoparticles on graphene not only provided the pseudocapacitance but also weakened the aggregation between the graphene layers, resulting in a higher surface area compared with pure graphene. In addition, the AC//PPG-15 asymmetric supercapacitor device showed a high energy density of 24.65 W h kg -1 at a low power density of 326.25 W kg -1 and good cycling stability (94.82% capacitance retention after 5000 cycles). Hence, the as-prepared PPG hybrid materials in this work possess tremendous potential as electrodes for high-performance supercapacitors.
Novel Mutations in CYP51B from Penicillium digitatum Involved in Prochloraz Resistance
Jinlong Wang,Jinhui Yu,Jing Liu,Yongze Yuan,Na Li,Muqing He,Ting Qi,Geng Hui,Li Xiong,Deli Liu 한국미생물학회 2014 The journal of microbiology Vol.52 No.9
Green mold caused by Penicillium digitatum is one of themost serious postharvest diseases of citrus fruit, and it isubiquitous in all citrus growing regions in the world. Sterol14α-demethylase (CYP51) is one of the key enzymes of sterolbiosynthesis in the biological kingdom and a prime targetof antifungal drugs. Mutations in CYP51s have been foundto be correlated with resistance to azole fungicides in manyfungal species. To investigate the mechanism of resistance toprochloraz (PRC) in P. digitatum, the PRC sensitivity wasdetermined in vitro in this study to assess the sensitivity of78 P. digitatum isolates collected in Hubei province. Theresults showed that 25 isolates were prochloraz-resistant(PRC-R), including six high-resistant (HR) strains, twelvemedium-resistant (MR) and seven low-resistant (LR) strains. A sequence analysis showed no consistent point mutationsof PdCYP51A in the PRC-R strains, but four substitutionsof CYP51B were found, Q309H in LR strains, Y136H andQ309H in HR strains, and G459S and F506I in MR strains,which corresponded to the four sensitivity levels. Based onthe sequence alignment analysis and homology modelingfollowed by the molecular docking of the PdCYP51B protein,the potential correlation between the mutations and PRC resistance is proposed.
A Zero-Watermark Scheme for Identification Photos based on QR Code and Visual Cryptography
De Li,Zhe Liu,LiHua Cui 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.1
This paper proposes a zero-watermark scheme for identification photos based on QR code and visual cryptography. The method makes no changes to original images while embedding the QR code watermark. In order to ensure the security, we use Arnold transformation to scrambling the watermark. In the scheme, we use discrete wavelet transform and matrix norm computing to generate the invariant feature values against print-scan attacks. Then the VC scheme is applied to generate the secret image from the feature values and the disturbed watermark by using a codebook. In the extraction scheme, we get the secret image which is registered to certification authority and the feature values extracted from the examined image with VC scheme, and then apply inverse Arnold transformation to restore the watermark, finally repair position patterns of the QR code. The experimental results show that the proposed algorithm is effective and robust against attacks such as JPEG compression, add noise, multiple filters, scale, little angle rotation and crop, especial print-scan attacks.