Infants are in the stage of lacking language expression ability, they tend to convey their emotions through facial expressions. However, there is a big difference between infant and adult facial contour, so it is impossible to use the existing adult expression library to recognize infant expressions. Based on this problem, 2,496 baby facial expressions picture had been collected in this paper and established a baby facial expression library -- IFER. In addition, due to the limited self-built data, a multi-stream CNN fusion network for infant facial expression recognition was proposed in this article, and proposes an improved LBP feature operator for infant facial expression feature extraction based on the particularity of infant face. Through the combination of handmade features and multi-stream CNN fusion network, the improved LBP and Sobel edge detection operators were used to extract three feature images in the horizontal and vertical directions of the image and input them into the multi-stream CNN model respectively. The experimental results show that compared with the traditional method, the combination of handmade features and multistream CNN fusion network can more effectively acquire the baby's facial features, and the accuracy is improved to 91.67%.
Acetylene and carbon dioxide share similar physical properties, which poses a significant challenge for their industrial separation. Therefore, it is crucial to design and synthesize specific physical adsorbents for this purpose. In this study, two pcu topological MOFs materials named JLU-MOF102 {[Ni(HPyC)2(BPY)] (DMF)2(H2O)2} and JLU-MOF103 {[Ni(HPyC)2(PYZ)] (H2O)2} (4-pyrazolecarboxylic acid = H2PyC, 4,4’-bipyridine = BPY, pyrazine = PYZ, DMF = N, N- dimethylformamide), were successfully synthesized to facilitate the separation of C2H2 and CO2. These MOFs were synthesized by using the pillar-layered strategy, both having the same sql layer (combined Ni2+ and HPYC) but different pillar ligands (BPY for JLU-MOF102 and PYZ for JLU-MOF103, respectively). The pore size of JLU-MOF103 is smaller than that of JLU-MOF102 and the interaction between JLU-MOF103 and C2H2 molecules is stronger. JLU-MOF102 and JLU-MOF103 exhibit significant ability to capture C2H2 (125.8 and 96.7 cm3/g, respectively) and the selectivity for C2H2/CO2 (v/v = 50/50) mixture is 4.5 and 14.0 calculated by IAST, respectively, at 298 K and 1 bar. First-principles-based calculations reveal subtle differences in host-guest interactions between JLU-MOF102 and JLU-MOF103 originated from the porous structures, which account for their distinct separation selectivity. The dynamic column breakthrough experiments demonstrated that JLU-MOF103 had a higher C2H2 adsorption capacity of 2.01 mmol/g compared to JLU-MOF102 (1.16 mmol/g). The low cost, excellent stability and good recycling ability suggest the potential of JLU-MOF103 for industrial applications.
Modern computer technology has been very mature,and its information processing capacity has been greatly improved,CAD 3D technology being mature and standardized direction.We should take seriously the development of CAD technology trend of the development of our CAD software industry and modern machinery design and production has far-reaching significance.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Design and synthesis of metal-organic frameworks (MOFs) with functional pore environments are of critical significance for the development of the porous adsorbents to solve energy and environmental crises. Herein, we utilized the structural and coordinated characteristics of adenine (HAD) ligands to develop a multi-functional MOF material (JLU-MOF68) with unique molecular-sized pockets for gas separation and Pb2+ removal. Benefiting from the internal surface environment and the size of 4.6 - 5.9 Å of the molecular pockets, JLU-MOF68 exhibited ultrahigh C3H8/CH4 selectivity coupled with the relatively high adsorption capacity of C3H8. Both N sites and extra-framework organic cations were conducive to the adsorption of Pb2+ through weak chemical coordination and ion exchange, respectively. The activated JLU-MOF68 showed not only an ultrahigh Pb2+ adsorption capacity of 805 mg g-1, but also exceptionally high Pb2+ removal efficiency under the condition of different pH and coexisting ions. Moreover, the adsorbent can be reused at least five times, and the removal efficiency remains almost constant after five cycles. Therefore, JLU-MOF68 had a wide potential application for the C3H8/CH4 selective separation and capture of Pb2+.
Numerical Analysis of china high-speed train in fire with the large eddy simulation software FDS(Fire Dynamic Simulator) developed by NIST.On the condition of the train speed is 40 km/h and the heat release rate is 10 MW,15 MW,20 MW,25 MW respectively.Numerical simulation and analysis results show that the train fire in China high-speed vehicle,the maximum heat release is 20 MW.The heat release rate in the train can change the temperature and gas concentration and distributed,but with a little effect between the heat release rate 10 MW to 20 MW.Vehicle wall has a high temperature zone bout 1 000℃,therefore,the train must also consider the outer wall of fire protection.
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