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Jian Zhang,Hongjun Wang,Ting Zhou,Zixuan Wang,Zhihua Chen 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.1
In this study, three double-plate connected L-shaped concrete-filled steel tube composite (LCFST-D) columns were subjected to axial and eccentric loading tests using spherical-hinge supports to relieve the bidirectional rotation constraints. By analyzing the failure phenomenon of the LCFST-D specimen, the rotation of the endplate, and the comparison of similarities and differences between the support of the knife-edge and the support of the spherical-hinge, the bidirectional eccentric loading performance of the LCFST-D column when the bidirectional rotation constraint was released was studied. The test results show that when the spherical-hinge support was loaded, the out-of-the-plane deflection was more evident than the knife hinge. The bearing capacity of the LCFST-D specimen decreases as the eccentricity increased. When the end rotation constraints were relieved, the failure mode of the axial and eccentric loading was nontorsional bidirectional instability. In addition, the loading tests using spherical-hinge supports were verified to effectively release end rotation constraints. A finite element model for the LCFST-D column was established, and its accuracy was confirmed. From the failure mode, deflection, bearing capacity, and rotation of the endplate, the differences between spherical-hinge, knife-edge hinge, and rigid pad loading supports and their influence on bidirectional eccentric loading tests performed on special-shaped columns were investigated. The results show that the bidirectional eccentric loading performance of the LCFST-D column can be reflected by spherical-hinge supports. The theoretical formula was used simultaneously to verify the data from the finite element model and the test.
Kwon, Seong Jung,Zhou, Hongjun,Fan, Fu-Ren F.,Vorobyev, Vasily,Zhang, Bo,Bard, Allen J. Royal Society of Chemistry 2011 Physical chemistry chemical physics Vol.13 No.12
<P>Collisions of several kinds of metal or metal oxide single nanoparticles (NPs) with a less catalytic electrode surface have been observed through amplification of the current by electrocatalysis. Two general types of current response, a current staircase or a current blip (or spike) are seen with particle collisions. The current responses were caused by random individual events as a function of time rather than the usual continuous current caused by an ensemble of a large number of events. The treatment of stochastic electrochemistry like single NP collisions is different from the usual model for ensemble-based electrochemical behaviour. Models for the observed responses are discussed, including simulations, and the frequency of the steps or blips investigated for several systems experimentally.</P> <P>Graphic Abstract</P><P>Electrochemical measurements of single nanoparticle collisions at an electrode correlate with random walk simulations. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp02543g'> </P>
Dai Xiuchun,Chen Long,Zhou Hongjun,Zhou Xinhua 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2
Nanopesticides represent one of the effective ways of reducing the use of pesticides and the environmental pollution. Natural zein as a potential carrier for nanoencapsulation of pesticides has the disadvantages of large amount of organic solvents and poor dispersibility. In this study, a water soluble of zein peptides was obtained by hydrolyzed under alkaline conditions with heated and stability of nanopesticides were prepared through crosslinked after self-assemble. As the results, the zein peptides spontaneously assembled into spherical particles in an aqueous solution, the nanopesticides (avermectin, AVM), with uniform size distribution and size can be adjusted by the glutaraldehyde, have a great stability, and redispersed in water after freeze-drying. Moreover, nanoencapsulation protects avermectin from UV light, with 24% of the encapsulated AVM remaining intact after exposure to UV for 60 min, compared to less than 6% for the bare AVM. In addition, the nanoformulation had similar insecticidal activity to commercial EC and the cross-linking of particles slowed down the release rate and the curves were consistent with Higuchi model different from the abnormal diffusion in the uncross linked state. In short, this study provides a simple method to obtain stabilizable nanopesticides based on natural polymer on a green way.
Hui Shang,Zehua Zhu,Wenhui Zhang,Hongjun Zhou 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
The main process for industrial synthesis of hydrogen peroxide is to subject 2-ethylanthraquinone to cyclic hydrogenation and oxidation. Hydrogenation catalyst is one of the key techniques of anthraquinone route. A new egg-shell palladium catalyst with racshig-ring alumina supported was developed for meeting the mechanism and improving mass transformation based on the kinetics and mass transfer theory, the effects of materials feeding methods together with operating conditions on the hydrogenation efficiency were detailed. It was concluded that the egg-shell palladium catalyst developed by this research has higher hydrogenation efficiency than the commercial contrast catalysts.
Large-Area Printed Broadband Membrane Reflectors by Laser Interference Lithography
Jung-Hun Seo,Jungho Park,Deyin Zhao,Hongjun Yang,Weidong Zhou,Byeong-Kwon Ju,Zhenqiang Ma IEEE 2013 IEEE photonics journal Vol.5 No.1
<P>We report here large-area broadband photonic crystal membrane reflectors (MRs) on glass substrates based on laser interference lithography (LIL) patterning and elastic stamp membrane transfer printing techniques. High-reflectivity broadband MRs on glass were realized with measured reflectivity of 95% around 1300 nm and a bandwidth of about 100 nm. Large-area nanopattern uniformity was experimentally verified with measured reflectivity from multiple locations of the large-area MRs. The work could lead to fabrication of the large-area high-performance MR at low cost with high throughput. The reflectors can be used in many types of optoelectronic and photonic devices.</P>