Thermal Stability of Precipitates in Al-2.8wt%Cu-1.4wt%Li Alloy

Congcong Zhu,Guoai Li,Shijia Hao,Guoling Mao,Wenli Gao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12

The microstructures and mechanical properties of Al-2.8 wt%Cu-1.4 wt%Li-T87 alloy after thermal exposure at 125, 150and 175 °C were measured and characterized by universal testing machine, scanning electron microscope and transmissionelectron microscope. The thermal stability of microstructures and mechanical properties of T87 heat-treated Al-2.8 wt%Cu-1.4 wt%Li alloy was investigated. The results show that the tensile strength of Al-2.8 wt%Cu-1.4 wt%Li-T87 alloy increasedfirst and then decreased with the increase of thermal exposure temperature, which is due to the change of the number and sizeof precipitates. After thermal exposure at 125 °C, the alloy exhibited higher strength due to further precipitation of θ′ phaseand stable size of T1phase. After thermal exposure at 175 °C, the mechanical properties of Al-2.8 wt%Cu-1.4 wt%Li-T87alloy decreased obviously, which was related to the dissolution of θ' phase and thickening of T1phase.

Implementation and Calculation of General Electricity Prices on Industry with Fee Charging Terminal

Congcong Li,Zhongyao Zhang,Xiao Liu 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.1

The calculation of general electricity prices on industry has great significance in cost control, energy conservation and emission reduction, as well as high efficiency management of electricity for the key electric power customers. Traditional solution has specific defections in time-consuming, convenience, and readout, however, the fee charging terminal has provided a more reasonable solution in interaction interface and abundant parameters settings with high efficiency.

Transition metal modified manganese-based catalysts for soot oxidation promoted by noncompetitive adsorption of oxygen: Experiments and DFT calculations

Congcong Li,Ruiqi Li,Yuhang Wang,Runhan Niu,Qilong Guo,Changsen Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-

A series of manganese-based oxide catalysts were synthesized by the hydrothermal method. By adjustingthe doping amounts of W and Cu in the system to study the catalytic performance of transition metaldopedmanganese oxides on soot combustion. They were deeply studied through various characterizationsand theoretical calculations. The results show that Wand Cu doping modifications can significantlyimprove the activity of manganese-based oxides in soot oxidation. W-Cu0.1/MnOx prepared by comodificationofWand Cu at 395 C can convert 90% of soot into CO2. The multiple characterization resultsshow that by adjusting the doping amount of copper and tungsten, the nano-flower-like morphology canbe obtained and the crystal plane can be reconstructed, which is helpful to increase the specific surfacearea, Mn3+ content, and oxygen vacancy content. The theoretical calculation results show that the oxygenvacancy on the surface of the catalyst shows the ability to activate O2 and H2O, and they show noncompetitiveadsorption. In addition, W-Cu0.1/MnOx has a good application prospect in the catalytic oxidationof soot because of its excellent catalytic stability. This work provides a reference for the designand preparation of non-noble metal-based catalysts for the elimination of soot particles from dieselengine exhaust.

Resequencing 302 wild and cultivated accessions identifies genes related to domestication and improvement in soybean

Zhou, Zhengkui,Jiang, Yu,Wang, Zheng,Gou, Zhiheng,Lyu, Jun,Li, Weiyu,Yu, Yanjun,Shu, Liping,Zhao, Yingjun,Ma, Yanming,Fang, Chao,Shen, Yanting,Liu, Tengfei,Li, Congcong,Li, Qing,Wu, Mian,Wang, Min,Wu, Nature Publishing Group, a division of Macmillan P 2015 Nature biotechnology Vol.33 No.4

Understanding soybean (Glycine max) domestication and improvement at a genetic level is important to inform future efforts to further improve a crop that provides the world's main source of oilseed. We detect 230 selective sweeps and 162 selected copy number variants by analysis of 302 resequenced wild, landrace and improved soybean accessions at >11× depth. A genome-wide association study using these new sequences reveals associations between 10 selected regions and 9 domestication or improvement traits, and identifies 13 previously uncharacterized loci for agronomic traits including oil content, plant height and pubescence form. Combined with previous quantitative trait loci (QTL) information, we find that, of the 230 selected regions, 96 correlate with reported oil QTLs and 21 contain fatty acid biosynthesis genes. Moreover, we observe that some traits and loci are associated with geographical regions, which shows that soybean populations are structured geographically. This study provides resources for genomics-enabled improvements in soybean breeding.

Structural and functional comparative mapping between the Brassica A genomes in allotetraploid Brassica napus and diploid Brassica rapa.

Jiang, Congcong,Ramchiary, Nirala,Ma, Yongbiao,Jin, Mina,Feng, Ji,Li, Ruiyuan,Wang, Hao,Long, Yan,Choi, Su Ryun,Zhang, Chunyu,Cowling, Wallace A,Park, Beom Seok,Lim, Yong Pyo,Meng, Jinling Springer 2011 TAG. Theoretical and applied genetics. Theoretisch Vol.123 No.6

<P>Brassica napus (AACC genome) is an important oilseed crop that was formed by the fusion of the diploids B. rapa (AA) and B. oleracea (CC). The complete genomic sequence of the Brassica A genome will be available soon from the B. rapa genome sequencing project, but it is not clear how informative the A genome sequence in B. rapa (A(r)) will be for predicting the structure and function of the A subgenome in the allotetraploid Brassica species B. napus (A(n)). In this paper, we report the results of structural and functional comparative mapping between the A subgenomes of B. napus and B. rapa based on genetic maps that were anchored with bacterial artificial chromosomes (BACs)-sequence of B. rapa. We identified segmental conservation that represented by syntenic blocks in over one third of the A genome; meanwhile, comparative mapping of quantitative trait loci for seed quality traits identified a dozen homologous regions with conserved function in the A genome of the two species. However, several genomic rearrangement events, such as inversions, intra- and inter-chromosomal translocations, were also observed, covering totally at least 5% of the A genome, between allotetraploid B. napus and diploid B. rapa. Based on these results, the A genomes of B. rapa and B. napus are mostly functionally conserved, but caution will be necessary in applying the full sequence data from B. rapa to the B. napus as a result of genomic rearrangements in the A genome between the two species.</P>

Geochemical identification of the source and environment of produced water from CBM wells and its productivity significance: examples from typical CBM wells in eastern Yunnan and western Guizhou

Zhaobiao Yang,Congcong Wu,Yong Qin,Geng Li,Zonghao Qin 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.4

The geochemical information of produced water from coalbed methane (CBM) wells is abundant in geological significance. Based on the conventional ions, hydrogen and oxygen isotopes (δD and δ18O) and trace element tests of 27 produced water samples from CBM wells, the geochemical identification of the source and environment of produced water from CBM wells and its productivity significance have been analysed. The following conclusions have been drawn: CBM produced water can be divided into three categories, namely, polluted water from frac fluids, polluted surface water and formation water. The formation water has low Cl– concentration, low total dissolved solids (TDS) concentration, and light δD and δ18O. The water polluted by frac fluid has high Cl– and TDS concentrationt, and heavy δD and δ18O. The polluted surface water has high SO42– and light δD and δ18O. CBM groundwater environments can be divided into confined and unconfined systems. The confined system is characterized by low Na+/Cl– value, high (Cl– – Na+)/Mg2+ value, a general absence of SO42–, high Sr and Ba and low F. The unconfined system is characterized by high Na+/Cl– value, low (Cl– – Na+)/Mg2+ value, low SO4 2–, low Sr and Ba and high F. Constructing a cross plot with the new D drift index (d’) value and Cl– concentration can further identify four types of source-water environments: an unconfined formation water system, an unconfined surface water system, a confined system heavily polluted by frac fluids, and a confined system only slightly polluted by frac fluids. The unconfined system often produces more formation water and has high CBM production. The confined system often produces water more heavily polluted by frac fluids and is low in CBM production. The fitting formulas of hydrochemical productivity have been established for daily CBM and water production of CBM wells.

The Design of System about Cow Activity Based on SVM

Weizheng Shen,Congcong Chen,Shuang Zheng,Shanjun He,Mingda Li 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3

In view of the cow extensive farming, which lacks modern management tools, the cow estrus determine are often laid off. In this paper, a cow behavioral characteristic is designed. The system collects X, Y, Z axis acceleration data through triaxial accelerometer ADXL345, by ZigBee wireless network and RS485 sent to the information center, it’s based on the support vector of binary tree to classify their behavior. The result shows, the algorithm for cow’s stationary and moving classification accuracy was 93.26%, a slight and sharp motion accuracy was 84.81%, It provides an effective basis in judging cows in heat or in physical abnormalities. That system contributes to the refinement of cows feeding and health culture,and has great significance for the stable and healthy development of the dairy industry.

Fabrication and Photocatalytic Properties of Visible Light Responsive Cuprous Oxide Cubes

Jiudong Lin,Feifei Tao,Congcong Sheng,Jianwei Li,Xiaoding Yu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4

The cuprous oxide cubes with the special porous surface constructed by nano-prisms have been successfully fabricated by a solvothermal method. The template-free method is simple and facile without any surfactant. The X-ray powder diffraction (XRD) pattern suggests that the as-prepared product is the pure primitive cubic Cu2O. The effects of the experimental parameters, such as the reaction temperature, reaction time and the concentration of sodium acetate anhydrous, on the morphologies of the products were investigated in detail by the scanning electron microscopy (SEM). Based on the time-dependent experiments, the possible formation mechanism was proposed. Using photocatalytic degrading reactive dyes as the model reaction and xenon lamp to simulate sunlight, the Cu2O cubes with the porous surface might possess higher photocatalytic activity than those of the commercial Cu2O powder in the visible-light region, indicating the excellent photocatalytic performance.

Reliability Analysis of Unrepairable Systems with Uncertain Lifetimes

Ying Liu,Xiaozhong Li,Congcong Xiong 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.12

The topic of unrepairable system is an important content in system reliability theory. There are many reasons cannot be repaired, some because of technical reasons, cannot repair, some because of economic reasons, not worth to repair, and some because of making repairable system simplification. So it is essential to pay attention to unrepairable systems. In this paper, the lifetimes of unrepairable systems are considered as uncertain variables. Based on that, the fundamental mathematical models of series systems, parallel systems, series-parallel systems and parallel-series systems are established, respectively. Furthermore, we make reliability analysis of above four unrepairable systems, respectively. Some numerical examples are also given for illustration.

Fabrication and Photocatalytic Properties of Visible Light Responsive Cuprous Oxide Cubes

Lin, Jiudong,Tao, Feifei,Sheng, Congcong,Li, Jianwei,Yu, Xiaoding Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4

The cuprous oxide cubes with the special porous surface constructed by nano-prisms have been successfully fabricated by a solvothermal method. The template-free method is simple and facile without any surfactant. The X-ray powder diffraction (XRD) pattern suggests that the as-prepared product is the pure primitive cubic $Cu_2O$. The effects of the experimental parameters, such as the reaction temperature, reaction time and the concentration of sodium acetate anhydrous, on the morphologies of the products were investigated in detail by the scanning electron microscopy (SEM). Based on the time-dependent experiments, the possible formation mechanism was proposed. Using photocatalytic degrading reactive dyes as the model reaction and xenon lamp to simulate sunlight, the $Cu_2O$ cubes with the porous surface might possess higher photocatalytic activity than those of the commercial $Cu_2O$ powder in the visible-light region, indicating the excellent photocatalytic performance.