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- 저자 : Zijun Xiao (검색결과 4 건)
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Zijun Xiao,Xiankun Zhu,Lijun Xi,Xiaoyuan Hou,Li Fang,Jian R. Lu 한국미생물학회 2014 The journal of microbiology Vol.52 No.5
In the effluents of a biologically treated wastewater from aheavy oil-refining plant, C5-C8 fatty acids including pentanoicacid, hexanoic acid, heptanoic acid, octanoic acid, and2-methylbutanoic acid are often detected. As these residualfatty acids can cause further air and water pollution, a newMyroides isolate ZB35 from activated sludge was explored todegrade these C5-C8 fatty acids in this study. It was foundthat the biodegradation process involved a lag phase thatbecame prolonged with increasing acyl chain length whenthe fatty acids were individually fed to this strain. However,when fed as a mixture, the ones with longer acyl chains werefound to become more quickly assimilated. The branched 2-methylbutanoic acid was always the last one to be depletedamong the five fatty acids under both conditions. Metaboliteanalysis revealed one possible origin of short chain fatty acidsin the biologically treated wastewater. Aroma volatiles including2-methylbutyl isovalerate, isoamyl 2-methylbutanoate,isoamyl isovalerate, and 2-methylbutyl 2-methylbutanoatewere subsequently identified from ZB35 extracts, linking thesource of the fruity odor to these esters excreted by Myroidesspecies. To our best knowledge, this is the first finding of thesearoma esters in bacteria. From a biotechnological viewpoint,this study has revealed the potential of Myroides species asa promising source of aroma esters attractive for food andfragrance industries.
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Zijun Wu,Shuting Wang,Renbin Xiao,Lianqing Yu 한국CDE학회 2020 Journal of computational design and engineering Vol.7 No.4
This paper develops a new topology optimization approach for minimal compliance problems based on the parameterized level set method in isogeometric analysis. Here, we choose the basis functions as level set functions. The design variables are obtained with Greville abscissae based on the corresponding collocation points. The zero-level set boundaries are derived from the level set function values of the interpolation points in all knot spans. In the optimization iteration process, the whole design domain is discretized into two types of subdomains around the zero-level set boundaries, undesign area with void materials and redesign domain with solid materials. To decrease the size of equations and the computational consumptions, only the solid material area is recalculated and the void material area is discarded according to the high accuracy of isogeometric analysis. Numerical examples demonstrate the validity of the proposed optimization method.
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Wu Zijun,Xiao Renbin 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.2
The manufacturability model of complex structure is the premise of manufacturing, and it is necessary to consider material properties, structure design, manufacturing constraints, and so on. However, due to the inconsistent restrictions between design and manufacturing, it is not easy to obtain the manufacturable structure that matches its design performance using layer-wise manufacturing. This paper presents a topology optimization method for manufacturable form, which incorporates the self-supporting factors such as overhang angle and length based on the characteristics of the generic additive manufacturing process. The support relationship between the supporting and supported elements in self-supporting constraints is mapped to a cascade relationship between two adjacent layers. To avoid a low-density structure supporting multiple high-density ingredients, we establish a fabrication model using the smax and smin operators. Also, the sensitivity analysis and variable updating method are given under the Solid Isotropic Material with Penalization method. Furthermore, numerical examples are shown to validate the correctness and superiority of this proposed self-supporting structure design method.
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Xu, Sheng,Yan, Zheng,Jang, Kyung-In,Huang, Wen,Fu, Haoran,Kim, Jeonghyun,Wei, Zijun,Flavin, Matthew,McCracken, Joselle,Wang, Renhan,Badea, Adina,Liu, Yuhao,Xiao, Dongqing,Zhou, Guoyan,Lee, Jungwoo,Chu American Association for the Advancement of Scienc 2015 Science Vol.347 No.6218
<P><B>Popping materials and devices from 2D into 3D</B></P><P>Curved, thin, flexible complex three-dimensional (3D) structures can be very hard to manufacture at small length scales. Xu <I>et al.</I> develop an ingenious design strategy for the microfabrication of complex geometric 3D mesostructures that derive from the out-of-plane buckling of an originally planar structural layout (see the Perspective by Ye and Tsukruk). Finite element analysis of the mechanics makes it possible to design the two 2D patterns, which is then attached to a previously strained substrate at a number of points. Relaxing of the substrate causes the patterned material to bend and buckle, leading to its 3D shape.</P><P><I>Science</I>, this issue p. 154; see also p. 130</P><P>Complex three-dimensional (3D) structures in biology (e.g., cytoskeletal webs, neural circuits, and vasculature networks) form naturally to provide essential functions in even the most basic forms of life. Compelling opportunities exist for analogous 3D architectures in human-made devices, but design options are constrained by existing capabilities in materials growth and assembly. We report routes to previously inaccessible classes of 3D constructs in advanced materials, including device-grade silicon. The schemes involve geometric transformation of 2D micro/nanostructures into extended 3D layouts by compressive buckling. Demonstrations include experimental and theoretical studies of more than 40 representative geometries, from single and multiple helices, toroids, and conical spirals to structures that resemble spherical baskets, cuboid cages, starbursts, flowers, scaffolds, fences, and frameworks, each with single- and/or multiple-level configurations.</P>
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