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LOW TEMPERATURE SYNTHESIS OF Mg(OH)2 NANOTUBES IN AQUEOUS SOLUTIONS OF BLOCK COPOLYMER P123
HUI-MING CHENG,ZHIGANG ZHAO,FENGXIA GENG,HONGTAO CONG,JINBO BAI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.2
A simple aqueous solution-based block-polymer-assisted method was developed for the synthesis of Mg(OH)2 nanotubes using inexpensive starting materials (MgSO4 and NaOH) with significant advance of bringing down the average outer diameter to the regime below 10 nm. The synthesized nanotubes are found to possess a relatively high specific surface area up to 64 m2/g, which may suggest their potential value for use in the catalysis field. The Barrett–Joyner–Halenda pore-size distribution plot reveals a bimodal distribution centred at 3.4 and 17.3 nm, which may be from the tunnel cavity and the aggregated pores of Mg(OH)2 nanotubes, respectively. This method can be widely used to fabricate other inorganic 1D nanostructured materials and easily realized in industrial-scale synthesis.
Cheng Long Wu,Jian Cheng Kan,Qi Hui Wang,Ji Ming Liu,Zun Qiang Li 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.1
Prefabricated steel-concrete composite structure has the advantages of large bearing capacity, reliable connection, and good durability, which is of great significance to the development of building industrialization. In this paper, a finite element model (FEM) of the modular prefabricated SRC column-steel beam composite joint is established and verified its accuracy through ABAQUS. The effects of various parameter variables on the hysteresis curve, skeleton curve, ductility, energy consumption, and performance deterioration are investigated. The results show that as the axial compression ratio increases, the joint bearing capacity first increases and then decreases, the strength and stiffness have relatively stable degradation characteristics. However, the hysteresis curve has a certain “pinch” phenomenon, which reduces the energy consumption performance. Different column end bolts margin and apertures have little effect on the bearing capacity, strength and stiffness degradation performance, but affect energy consumption and ductility. The width-to-thickness ratio of the square steel tube has a greater impact on the bearing capacity, energy consumption and ductility, and has less impact on the strength and stiffness degradation performance. As the thickness of the joint cover plate increases, the bearing capacity, energy consumption and initial stiffness of the joint gradually increase, the ductility first increases and then decreases.
Cheng Zuo-Hui,Fan Fang-Fang,Zhao Jin-Zhong,Li Rui,Li Sheng-Cai,Zhang En-Jia,Liu Yu-Kun,Wang Jue-Ying,Zhu Xiang-Run,Tian Yong-Ming 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4
The microemulsion formulation (hereafter formulation) of curcuma oil and its acaricidal efficacy against Tetranychus cinnabarinus Boisduval (Acari: Tetranychidae) were optimized in the laboratory to evaluate their spray effectiveness of oviposition inhibition and repellence. Ethovision XT6 was used to analyse the effects of the sublethal concentrations (LC 20 ) of curcuma oil and the formulation on the behaviors of T. cinnabarinus. The results showed that Tween-80 was the best surfactant, Isopropanol was the best co-surfactant and K m = 2:1 was the best condition for the formulation. The prepared microemulsions are stable under conditions of centrifugation and incubation for extended periods. The results showed that the effect of the spray bioassays of the formulation against T. cinnabarinus continuously increased during the experiment, but for curcuma oil almost no longer increase observed when the exposure time went beyond 24 h. Moreover, compared with curcuma oil (LC 50 = 0.716%), the spray bioassay of the formulation (LC 50 = 0.035%) was stronger against T. cinnabarinus. The repellency of the formulation to T. cinnabarinus was stronger with increasing exposure time, but that of curcuma oil declined after 12 h of exposure. The mobile distance of T. cinnabarinus treated with the formulation continuously declined during the experiment but that due to the curcuma oil almost no longer declined when the treatment time reached 12 h. The maximum mobile frequency of T. cinnabarinus treated by curcuma oil and the formulation was recorded at 6 h and 12 h, respectively. Thus, the formulation is a promising candidate as a botanical acaricide of green vegetables.
Ming-Cheng Wu,Kuang-Hui Lu 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
The juvenile hormone titer during the last instar is a crucial determining switch for metamorphosis inlepidopterans.Wepreviously observed that the induction of glutathione S-transferase (GST) activity by a juvenilehormone analog (JHA) is reversely proportional to the occurrence of JHA-induced supernumerary instarsfollowing topical application of JHA to Spodoptera litura during the last instar period. In this paper, at least fiveJHA-induced GSTs were purified by glutathione-affinity chromatography, and one was further isolated fordetermination of the N-terminal sequence. The corresponding cDNA was cloned and named SlGST1 (GenBankaccession no. AY506545). SlGST1 was classified into the epsilon class of GSTs by phylogenetic analysis. Northernblot analyses further showed that the SlGST1 in fat bodies can be induced by JHA, particularly in 0-day-old sixthinstarlarvae, in which induction was much higher than that in 1- and 2-day-old sixth-instar larvae. To ourknowledge, this is the first JHA-inducible GST to have been identified, and we believe that it will provide newinsight into the role of GST in insect development, particularly during metamorphosis.
Ming-hui Pan,Wen-cheng Tang,Yan Xing,Jun Ni 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3
In order to reduce the deformation and assembly error in an antenna thin wall parts assembly process, the assembly location or clamping positions need to be optimized. In this paper, the effect of clamping positions and clamping force on the thin wall parts deformation is analyzed considering the gravity by finite element simulation under different clamping force. The clamping positions are optimized with the Adaptive Simulated Annealing (ASA), Multi-Island Genetic Algorithm (MIGA) and Particle Swarm Optimization (PSO) algorithm by Isight software to reduce the deformation. Comparing with MIGA and PSO method, the results show that the clamping position optimization based on ASA exhibits the better results and superior than the MIGA and PSO no matter whether it has the effect of gravity. Simultaneously, through establishing the contact force model and contact deformation model, the nonlinear relationship between contact force, contact deformation and contact area is qualitatively analyzed, and the node deformation is calculated by theoretical formula. Comparing with those results, it is shown that the theoretical value matches well with the simulation results. Finally, some clamping scheme principles are proposed so that it provides a basis for reducing the deformation and assembly error of thin wall parts in future.
Ming-Fu Wang,Guang-Yaw Liu,Ya-Fan Liao,Ying-Cheng Hung,Chih-Li Lin,Tzyh-Chyuan Hour,Ko-Huang Lue,Hui-Chih Hung 생화학분자생물학회 2011 Experimental and molecular medicine Vol.43 No.4
Ornithine decarboxylase (ODC) is the rate-limiting enzyme in polyamine biosynthesis and a target for chemoprevention. Hydroxydibenzoylmethane (HDB),a derivative of dibenzoylmethane of licorice, is a promising chemopreventive agent. In this paper, we investigated whether HDB would inhibit the ODC pathway to enhance apoptosis in human promyelocytic leukemia HL-60 cells. We found ODC enzyme activity was reduced during HDB treatment. Overexpression of ODC in HL-60 parental cells could reduce HDB-induced apoptosis, which leads to loss of mitochondrial membrane potential (Δψ m), through lessening intracellular ROS. Furthermore, ODC overexpression protected cytochrome c release and the activation of caspase-3 following HDB treatment. The results demonstrated HDB-induced apoptosis was through a mechanism of down-regulation of ODC and occurred along a ROS-dependent mitochondria-mediated pathway.