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A novel CCU approach of CO2 by the system 1,2-ethylenediamine+1,2-ethylene glycol
Jianbin Zhang,Bo Guo,Tianxiang Zhao,Feng Sha,Fei Zhang,Qiang Li 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.6
As a new, effective CO2 fixation system, 1,2-ethylenediamine and 1,2-ethylene glycol (EDA+EG) can efficiently activate CO2 and directly convert it into a novel CO2-storage material (CO2SM) with 46.3% yield. The aqueous CO2SM solution can react with Ca(OH)2-saturated limpid solution to generate morphology-controllable CaCO3 microparticles with additional CO2 bubbling and Ca(OH)2. Additionally, the aqueous EDA+EG solution could be recycled multiple times without significant loss of CO2 capturing and releasing capabilities.
Rapid Preparation of Ultrafine BaSO3 by SO2 Storage Material
Fei Zhang,Feng Sha,Xianshu Qiao,Tianxiang Zhao,Bo Guo,Jianbin Zhang 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.1
In this work, a green and efficient process was developed for the preparation of ultrafine BaSO3 with layered nanostructure surface via the reaction of BaCl2 with a SO2 storage material (SO2SM) at room temperature. The absorption of SO2 with equimolar ethylenediamine (EDA) and ethylene glycol (EG) afforded SO2SM, which not only offered alkyl sulfite but also released EDA and EG that served as efficient surfactants to promote the formation of BaSO3 with spherical morphology and porous structure in the process of synthesis of ultrafine BaSO3. The factors affecting the morphology and size of BaSO3 particle were assessed by investigating the effects of SO2SM concentration, BaCl2 concentration, stirring time and speed. It was found that a higher SO2SM concentration led to a higher degree of supersaturation, and the particle size of BaSO3 could be reduced by increasing SO2SM concentration. Moreover, under the identified optimal reaction conditions, ultrafine BaSO3 was obtained with an average diameter of 450 nm. In addition, a plausible formation process of BaSO3 was proposed to explain the observed reaction results. Overall, the developed process in this work provides an efficient method for the capture, utilization, and conversion of SO2 into a valuable chemical.
Tianxiang Pi,Zhongheng Du,Huchen Zhang,Sicheng Wang 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.3
Autoclaved aerated concrete (AAC) block masonry has been widely used for bearing walls of multi-story buildings or non-bearing walls of high-rise buildings because of its unique advantages, such as lightweight, low pollution output, and excellent thermal insulation performance. However, traditional AAC block masonry has the disadvantages of high water absorption, poor adhesion to mortar, and low construction efficiency. In order to improve the performance of traditional AAC masonry, this paper proposed a new kind of mortar-free AAC block masonry with concrete core-columns. Fundamental mechanical properties of compression and shear were studied. We divided a total of 16 compression specimens into four groups according to different hollow ratios and strength grades of the block, and eight shear specimens into two groups based on different hollow ratios. Each specimen consists of three-layer blocks with two core columns at the point of quadri-section. The diameters of columns were, respectively, 100 mm and 80 mm. The specimens were loaded at a constant speed to evaluate their bearing capacity, displacement response, crack development, and damage state. The formula of the average values and design values of the compressive and shear strength of masonry were obtained statistically. The stress–strain constitutive relation of masonry expressed by a three-stage curve was presented. Furthermore, the result of numerical analysis using the ABAQUS finite element program aligned well with the experimental results. The compressive strength and shear strength of the new type of masonry are no less than traditional AAC masonry, and new masonry has higher construction efficiency and more stable strength.
Yang Zhang,Zhiqiang Han,Tianxiang Gao,Huilai Shi 한국유전학회 2018 Genes & Genomics Vol.40 No.9
The genetic relationships of mantis shrimp Oratosquilla oratoria between the coastal waters of China and Japan were not well studied. To reveal the genetic differentiation and genetic structure among populations, we collected populations of mantis shrimp O. oratoria from the coastal waters of China and Japan to analyze the mtDNA control region variation. A total of 309 individuals of O. oratoria were collected from 13 localities (11 from China and 2 from Japan) and a segment of mitochondrial DNA control region was sequenced. Three hundred nine haplotypes were defined, yielding a very high haplotype diversity and nucleotide diversity. Two lineages of O. oratoria were revealed and displayed strong differences in the geographical distribution. In the coastal waters of China, the geographic distribution of the two lineages was completely separated by the Yangtze River estuary; however, the lineages showed geographic sympatry in two populations from Japan. Based on the lineage distribution, three groups were defined. There was no significant genetic differentiation among the populations within the three groups, indicating high gene flow within each group. Significant and negative values for Tajima D and Fu’s Fs tests, and mismatch distributions for two lineages indicated population expansion. The present result confirmed that the freshwater outflow from the Yangtze River formed a physical barrier and affected gene exchange. The different distribution patterns of the two lineages in coastal waters of China and Japan indicated that the larvae of O. oratoria were transferred from China to the coastal waters of Japan with a one-way gene flow.
Yan Chang,Jianbin Zhang,Qiang Li,Lihua Li,Bo Guo,Tianxiang Zhao 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
Liquid densities and viscosities are reported for the binary system of 1,2-ethanediamine (EDA)+triethyleneglycol (TEG) at T=(298.15, 303.15, 308.15, and 313.15) K. Densities were measured using a capillary pycnometerand viscosities were determined using an Ubbelohde capillary viscometer. The experimental results are compared withdata published in the literatures. Based on the density data and kinematic viscosity data, excess molar volumes (VmE)and deviation in kinematic viscosity (Δν) were calculated and the calculated results were fitted to a Redlich-Kister equa-tion to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmEare negative in the whole composition range, whereas the values of Δν are positive over the majorcomposition range. From kinematic viscosity data, Gibbs energies of activation of viscous flow (ΔG*), enthalpy of ac-tivation for viscous flow (ΔH*), and entropy of activation for the viscous flow (ΔS*) were also calculated.
Guan Wang,Pei Zhang,Linyuan Kou,Yan Wu,Tianxiang Wen,Xin Shang,Zhiwen Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.2
The hot deformation behavior of the Al-Zn-Mg-Cu alloy was studied by isothermal tensile tests in the temperature range of 200-350 °C and the strain rate range of 0.001-0.1 s -1 . A data-driven deep neural network (DNN) constitutive model and a phenomenological Arrhenius constitutive model were developed for the studied alloy model. The parameters of the DNN model were optimized to improve the prediction accuracy of flow stress. The results show that the accuracy of predictions of the DNN model is better than the Arrhenius model for the hot deformation behavior of 7075 aluminum alloy. The average absolute relative error and correlation coefficient of the DNN model is 1.70 % and 0.9996, respectively. The accuracy of the constitutive model of Arrhenius is relatively low for 7075 aluminum alloy in the range 200-350 °C, 0.001-0.1 s -1 . The optimal network depth and the number of neurons per layer for the analytically optimized DNN constitutive model are 6 and 28, respectively. In addition, the developed DNN model can be effectively applied in intelligent manufacturing, such as short-process highefficiency hot stamping and other plastic-forming technologies.
Lu Liu,Xiumei Zhang,Dianrong Sun,Tianxiang Gao,Na Song 한국해양과학기술원 2019 Ocean science journal Vol.54 No.2
The population genetic studies of marine fishes usually show complex patterns of genetic differentiation which were influenced by both historical process and contemporary gene flow. Genetic structure of eight different populations for eastern keelback mullet, Liza affinis, collected from the coast along eastern and southern China, was examined using six microsatellite loci. We found strong genetic similarities among most of the samples except the Dongguan population and most microsatellite variation was found within populations. All loci were characterized by high genetic variability with expected heterozygosities ranging from 0.871 to 0.928. The Bayesian cluster analysis of the microsatellite data detected four genetic groups with no relation to geographic areas. The bottleneck results also showed no significant values. Based on these data we postulated that complex marine currents and larval dispersal shaped the genetic structured of studied populations. The present study illustrated the importance of understanding the biological significance of genetic differentiation when using molecular data in identifying units for management and protection.
Acteoside reduces testosterone by inhibiting cAMP, p450scc, and StAR in rat Leydig cells
Shuqiang Liu,Junwen Zhang,Weixuan Li,Tianxiang Zhang,Defu Hu 대한독성 유전단백체 학회 2015 Molecular & cellular toxicology Vol.11 No.1
The present study investigated the in vivo and in vitro effects of acteoside on testosterone production in Sprague-Dawley (SD) rats. The in vivo experiment revealed that acteoside reduced the testosterone level in serum significantly (P⁄0.05). The in vitro experiment also illustrated that acteoside significantly reduced testosterone production in SD rat Leydig cells in primary culture (P⁄0.05). Enzyme-linked immunosorbent assay results demonstrated that acteoside significantly reduced the cyclic adenosine 3′, 5′-monophosphate (cAMP) level (P⁄0.05), and Western blot analysis showed that acteoside significantly reduced cholesterol side-chain cleavage enzyme (p450scc) and steroidogenic acute regulatory (StAR) expression (P⁄ 0.05). Hoechst 33342 staining and Western blotting showed that acteoside did not induce apoptosis in Leydig cells. Together, these results suggest that the acteoside-induced reduction in testosterone production in rat may be at least partially due to down-regulation of cAMP, p450scc, and StAR, but not apoptosis.