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Zhidan Lin,Baofeng Xu,Zixian Guan,Chao Chen 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
It has been observed that the formation of b-crystal is suppressed when b-polypropylene (b-PP) is blended with crystalline polymers, but the reason is still uncertain. In this study, we investigated the influence of the crystallization conditions of polytrimethylene terephthalate (PTT), such as melt crystallization, cold crystallization, isothermal crystallization temperature, and crystallization time on the b-nucleation behavior of PP phase in the b-PP/PTT blends. The results showed that the b-crystal content of PP phase in the blends decreases with increasing of PTT content. Cold crystallization of PTT would mainly induce the formation of a-crystal in PP component, whereas melt crystallization would induce the formation of b-crystal PP in their blends. The degree of crystallinity of PTT increases by improving the crystallization temperature or extending the time of crystallization, which leads to the production of more a-crystal in PP component. This means that the second component could inhibit the formation of b-crystal in PP.
Magnetotactic Bacterium Multi-objective Optimization Algorithm
Zhidan Xu 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.6
In this paper, based on Magnetotactic Bacteria Optimization Algorithm(MBOA), magnetotactic bacterium multi-objective optimization algorithm (MBMOA) is proposed for solving multi-objective optimization problems(MOPs). Magnetotactic bacterium optimization algorithm is a novel random research algorithm which simulates the process of magnetotactic bacteria (MTB) producing magnetosomes(MTS) to regulate cell moment and makes the magnetostatic energy reach the minimum .The algorithm MBOA proposed three operators named by MTS producing, MTS amplification and MTS replacement by imitating the development process of magnetosomes, the adjustment process of magnetosomes moment and the replacement process of magnetosome with worse moment. In MBMOA, MBOA is applied to produce the next population, while non-dominated feasible solutions gained by MBOA are conserved in the archive, then the evaluation method of SPEA2 is adopted to update the archive, at the last through benchmark functions test and classic algorithm comparison, the simulation results show that the MBMOA is feasible and effective for solving multi-objective optimization problems.
Crystallization and melting behavior of polypropylene in b-PP/polyamide 6 blends containing PP-g-MA
Zhidan Lin,Zixian Guan,Baofeng Xu,Chao Chen,Guangheng Guo,Jiaxian Zhou,Jiaming Xian,Lin Cao,Yueliang Wang,Mingqing Li,Wei Li 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
In this research, we used a twin-screw extruder to melt and blend PP-g-MA compatibilizer with bpolypropylene (PP)/polyamide 6 (PA6). The influences of the PA6 and PP-g-MA contents in PP/PA6 blends on crystallization and melting behavior of PP phase and morphology were investigated. The results showed that, when PP-g-MA copolymer was added to the b form of nucleated PP/PA6 blends, the anhydride groups in PP-g-MA and PA6 terminal amine groups react to form PP-g-PA graft copolymer in a two-phase interface. This reduces the interfacial tension, improves the interfacial adhesion, and reduces the size of PA6 domains in the blend. The generated PP-g-PA graft copolymer wrapped PA6 phase and buried the anhydride groups of PP-g-MA. When the proportion of PP-g-MA and PA6 was between 0.5 and 0.75, there was no longer interfering to the formation of b-crystals in the PP phase. The content of bcrystal of PP phase in blends was found to reach as large as 85.9%.
Huaixu Cheng,Zhidan Luo,Mingsheng Lu,Song Gao,Shujun Wang 한국미생물학회 2017 The journal of microbiology Vol.55 No.5
The hyperthermophilic α-amylase from Thermococcus sp. HJ21 does not require exogenous calcium ions for thermostability,and is a promising alternative to commercially availableα-amylases to increase the efficiency of industrial processeslike the liquefaction of starch. We analyzed the aminoacid sequence of this α-amylase by sequence alignments andstructural modeling, and found that this α-amylase closelyresembles the α-amylase from Pyrococcus woesei. The geneof this α-amylase was cloned in Escherichia coli and the recombinantα-amylase was overexpressed and purified witha combined renaturation-purification procedure. We confirmedthermostability and exogenous calcium ion independencyof the recombinant α-amylase and further investigatedthe mechanism of the independency using biochemical approaches. The results suggested that the α-amylase has a highcalcium ion binding affinity that traps a calcium ion that wouldnot dissociate at high temperatures, providing a direct explanationas to why the addition of calcium ions is not requiredfor thermostability. Understanding of the mechanism offersa strong base on which to further engineer properties of thisα-amylase for better potential applications in industrial processes.
Xu Yi,Fang Feng,Zhidan Xiang,Li Ge 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.3
This study was designed to investigate the effects of allitridin on the expression of transcription factors T-betand GATA-3 in mice infected by murine cytomegalovirus (MCMV). A BALB/c mouse model system of MCMV infectionwas established. Twenty mice were allocated randomly into an allitridin-treated group (n . 10) and a placebo control group(n . 10). The same dose (25 mg/kg/day) and regimen of allitridin were used in the treated group in the 24 hours after virusinfection; the same volume of saline solution was injected in placebo control mice. In an additional blank control group (n .10), the same volume of saline solution was injected. The expression levels of the transcription factors T-bet and GATA-3were measured by reverse transcriptionpolymerase chain reaction. The expression levels of the T helper (Th) 1 cytokine in-terferon-. (IFN-.) and the Th2 cytokine interleukin (IL)-10 in supernatant of spleen cell culture were measured by enzyme-linked immunosorbent assay. MCMV infection markedly down-modulated the expression of IFN-. and T-bet and significantlyup-modulated the expression of IL-10 and GATA-3. Allitridin induced significantly (P. .01) increased expression of thetranscription factor T-bet and the Th1 cytokine IFN-. and markedly (P. .01) decreased expression of the transcription fac-tor GATA-3 and the Th2 cytokine IL-10. Thus MCMV infection could lead to disequilibrium of Th1/Th2 cytokine expres-sion: The level of the Th1 cytokine IFN- was decreased significantly, and Th2 cytokine IL-10 was overexpressed markedly.Allitridin could up-regulate the expression of T-bet and IFN-. and inhibit the expression of GATA-3 and IL-10 in MCMV-infected mice, indicating a Th1 dominant state, which should enhance the specific cellular immune reactions against cy-tomegalovirus (CMV) and be helpful for clearance of CMV from the host.
Yangkai Zhang,Yiyu Lu,Jiren Tang,Yuanfei Ling,Lei Wang,Qi Yao,Zhidan Zhu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
Based on the theory of hydraulic self-reversing and pressurization, a variable cross-section squeeze pulse water jet rock breaking platform was built. When the nozzle diameter is 0.5 mm, the granite erosion and crushing experiments under different driving pressures are carried out, and the depth, volume and specific energy consumption of the erosion pit are analyzed. The results show that the device can achieve intermittent injection after pressurizing the input fluid at a rate of 5.8 times. Meanwhile, the pressurization process of fluid is divided into ascending section, stable section and descending section. Compared with the continuous water jet with the same peak output pressure, the depth of destroyed granite is increased by 129 %-288 %, the volume of broken granite is increased by 37 %-121 %, and the specific energy consumption per unit of crushing volume is reduced by 21 %-74 %. The device can use low-pressure fluid to effectively crush granite.
Yanyu Chen,Xiao Wang,Huaijun Lin,Florian Vogel,Wei Li,Lin Cao,Zhidan Lin,Peng Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
A simple and efficient method for disposing of waste low-density polyethylene (LDPE) express packagingbags is proposed in this paper as a way to minimize waste and address the energy shortage at the sametime. In addition to following the production of carbon nanotubes (CNTs) derived from LDPE, the applicationof CNTs as electrodes for supercapacitors was attempted. Waste LDPE bags were pyrolyzed andcarbonized with catalyst using a dual-temperature reaction system, a designed 450 C pyrolysis temperatureaccompany with different carbonization temperatures (650 C, 700 C, 750 C, 800 C, 850 C), andtreatment durations (0 h, 2 h, 4 h, 6 h) were investigated. As determined by FE-SEM and FE-TEM, the CNTssynthesized at 750 C showed a finer tube diameter, much more uniform distribution, bamboo-like structure,as well as the highest yield of 41.9 %, and carbon conversion of 61.2 %. As being charged and discharged10,000 times, the electrode remained a 93.16 % capacitance and a 92.85 % Coulomb efficiency. A dual-temperature reaction system could be utilized to recycle waste LDPE efficiently, and the LDPEderivedCNTs could be applied for supercapacitors.
Pressure-Induced Confined Metal from the Mott InsulatorSr3Ir2O7
Ding, Yang,Yang, Liuxiang,Chen, Cheng-Chien,Kim, Heung-Sik,Han, Myung Joon,Luo, Wei,Feng, Zhenxing,Upton, Mary,Casa, Diego,Kim, Jungho,Gog, Thomas,Zeng, Zhidan,Cao, Gang,Mao, Ho-kwang,van Veenendaal, American Physical Society 2016 Physical Review Letters Vol.116 No.21
<P>The spin-orbit Mott insulator Sr3Ir2O7 provides a fascinating playground to explore insulator-metal transition driven by intertwined charge, spin, and lattice degrees of freedom. Here, we report high-pressure electric resistance and resonant inelastic x-ray scattering measurements on single-crystal Sr3Ir2O7 up to 63-65 GPa at 300 K. The material becomes a confined metal at 59.5 GPa, showing metallicity in the ab plane but an insulating behavior along the c axis. Such an unusual phenomenon resembles the strange metal phase in cuprate superconductors. Since there is no sign of the collapse of spin-orbit or Coulomb interactions in x-ray measurements, this novel insulator-metal transition is potentially driven by a first-order structural change at nearby pressures. Our discovery points to a new approach for synthesizing functional materials.</P>