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Zhang, Liaoyuan,Singh, Raushan,D, Sivakumar,Guo, Zewang,Li, Jiahuan,Chen, Fanbing,He, Yuanzhi,Guan, Xiong,Kang, Yun Chan,Lee, Jung-Kul unknown 2018 Green Chemistry Vol. No.
<P>Upgrading ethanol to higher order alcohols is desired but difficult using current biotechnological methods. In this study, we designed a completely artificial reaction pathway for upgrading ethanol to acetoin, 2,3-butanediol, and 2-butanol in a cell-free bio-system composed of ethanol dehydrogenase, formolase, 2,3-butanediol dehydrogenase, diol dehydratase, and NADH oxidase. Under optimized conditions, acetoin, 2,3-butanediol, and 2-butanol were produced at 88.78%, 88.28%, and 27.25% of the theoretical yield from 100 mM ethanol, respectively. These results demonstrate that this artificial synthetic pathway is an environmentally-friendly novel approach for upgrading bio-ethanol to acetoin, 2,3-butanediol, and 2-butanol.</P>
Fabrication of TiO<sub>2</sub> Microrod with Desired Shapes from Rod-like Titanium Glycolate
Han, Jianjun,Zhang, Hua,Li, Yuanzhi,Zhao, Xiujian,Chen, Hong,Wu, Zhongkui,Kim, Sun-Jae,Park, Kyeong Soon Chemical Society of Japan 2007 Chemistry letters Vol.36 No.11
<P>Rod-like titanium glycolate was prepared by poly-condensation of TiCl<SUB>4</SUB>, ethylene glycol, and water. Focusing electronic beam on one side of a titanium glycolate microrod led to bending of the micro-rod at the irradiation part. Calcination of the polymer results in formation of rod-like titania. By controlling irradiation time and changing focus position of electronic beam, we realized controllable processing of titania microrod with desired shapes, which may be find application in nano or microdevices.</P>
Improving performance of medical image alignment through super-resolution
Liwei Deng,Yuanzhi Zhang,Jing Wang,Sijuan Huang,Xin Yang 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.3
Medical image alignment is an important tool for tracking patient conditions, but the quality of alignment is influenced bythe effectiveness of low-dose Cone-beam CT (CBCT) imaging and patient characteristics. To address these two issues, wepropose an unsupervised alignment method that incorporates a preprocessing super-resolution process. We constructed themodel based on a private clinical dataset and validated the enhancement of the super-resolution on alignment using clinicaland public data. Through all three experiments, we demonstrate that higher resolution data yields better results in the alignmentprocess. To fully constrain similarity and structure, a new loss function is proposed; Pearson correlation coefficientcombined with regional mutual information. In all test samples, the newly proposed loss function obtains higher resultsthan the common loss function and improve alignment accuracy. Subsequent experiments verified that, combined with thenewly proposed loss function, the super-resolution processed data boosts alignment, can reaching up to 9.58%. Moreover,this boost is not limited to a single model, but is effective in different alignment models. These experiments demonstratethat the unsupervised alignment method with super-resolution preprocessing proposed in this study effectively improvedalignment and plays an important role in tracking different patient conditions over time.
The morphology control on the preparation of silver nanotriangles
Guansong Hu,Wen Zhang,Yuanzhi Zhong,Guorun Liang,Qingyuan Chen,Wanzhong Zhang 한국물리학회 2019 Current Applied Physics Vol.19 No.11
A seed-mediated growth method was commonly applied to prepare one-dimension nanomaterials. However, some associated particles were unavoidable in the formation of target nanoparticles. Herein, we reported a modified method to prepare silver nanotriangles with higher uniform shape and particle size. The size and morphology of the formed nanoparticles could be controlled by regulating reaction conditions. The results showed that cetyl trimethyl ammonium bromide (CTAB) concentration and seed concentration were related with both the morphology and the particle size. The NaOH concentration, AgNO3 concentration, and the mole ratio of Vc/Ag+ mainly affected the particle size of the formed nanotriangles. The formation of silver nanotriangles may be due to the selective stacking of the new tiny nanoparticles and the oriented growth of silver seed crystals. The oxidizing action of Br−/O2 existing in the CTAB system should be responsible for the final morphology of truncated triangular silver nanoplates.
Yu, Subeen,Shin, Taeil,Zhang, Maosheng,Xia, Yuanzhi,Kim, Hyunwoo,Lee, Sunwoo American Chemical Society 2018 ORGANIC LETTERS Vol.20 No.23
<P>Direct transamidation of secondary amides was developed via nickel catalysis. In the presence of trimethylsilyl chloride and manganese, Ni(diglyme)Cl<SUB>2</SUB> with a Briphos ligand efficiently promoted the transamidation of <I>N</I>-aryl benzamide derivatives with primary amines to afford the corresponding secondary amides in moderate to good yields. Primary amines bearing electron-donating groups gave higher yields of the transamidation products.</P> [FIG OMISSION]</BR>
( Zewang Guo ),( Xihua Zhao ),( Yuanzhi He ),( Tianxing Yang ),( Huifang Gao ),( Ganxin Li ),( Feixue Chen ),( Meijing Sun ),( Jung-kul Lee ),( Liaoyuan Zhang ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.1
Acetoin (AC) is a volatile platform compound with various potential industrial applications. AC contains two stereoisomeric forms: (3S)-AC and (3R)-AC. Optically pure AC is an important potential intermediate and widely used as a precursor to synthesize novel optically active materials. In this study, chiral (3R)-AC production from meso-2,3-butanediol (meso-2,3-BD) was obtained using recombinant Escherichia coli cells co-expressing meso-2,3-butanediol dehydrogenase (meso-2,3-BDH), NADH oxidase (NOX), and hemoglobin protein (VHB) from Serratia sp. T241, Lactobacillus brevis, and Vitreoscilla, respectively. The new biocatalyst of E. coli/pET-mbdh-nox-vgb was developed and the bioconversion conditions were optimized. Under the optimal conditions, 86.74 g/l of (3R)-AC with the productivity of 3.61 g/l/h and the stereoisomeric purity of 97.89% was achieved from 93.73 g/l meso-2,3-BD using the whole-cell biocatalyst. The yield and productivity were new records for (3R)-AC production. The results exhibit the industrial potential for (3R)-AC production via whole-cell biocatalysis.
Liu Xi,Liang Rui,Hu Yuanzhi,Tang Xuebang,Bastien Christophe,Zhang Ruibin 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.5
Frontal impacts are the most frequent crash types and may generate extreme body in white (BIW) deformations. Vehicles are subjected to impact evaluation rating protocols such as 100 % Front Rigid Barrier (FRB) impact, 40 % Offset Deformable Barrier (ODB) impact and 25 % overlap (small overlap) impact. This paper proposes a collaborative optimization process using optimal Latin hypercube design (Opt LHD) and response surface methodology (RSM), to improve the vehicle crashworthiness in the frontal impacts, by considering displacement oriented structure (DOS). Upper and lower engine bay structure were considered herein to increase the lateral vehicle displacement during small overlap impact and decrease the impact force that transferred to the passenger compartment in the frontal impacts. The optimal results indicated that the acceleration of the B-pillar was reduced 0.4g in the FRB impact, the intrusion of the firewall was reduced by 55.13 % in the ODB impact, and the intrusion of passenger compartment during small overlap impact was decreased by an average of 53.88 %, with a maximum percentage of 71.41 % around left toepan, leading to an IIHS rating to acceptable from poor. The proposed crashworthiness design approach is effective in vehicle structure optimization for better frontal impacts performance.
Han, Sehyeon,Kim, Han-Sung,Zhang, Maosheng,Xia, Yuanzhi,Lee, Sunwoo American Chemical Society 2019 Organic letters Vol.21 No.14
<P>The synthesis of <I>gem</I>-1,3-enynes via Ni/Cu-catalyzed decarboxylative addition of alkynoic acids to terminal alkynes has been developed. It was found that the decarboxylation of an alkynoic acid led predominantly to <I>gem</I>-1,3-enynes instead of 1,3-diynes, which have been known to be formed through the coupling of terminal alkynes. A variety of <I>gem</I>-1,3-enynes were obtained in good yields. This catalytic system exhibited excellent regioselectivity and high functional group tolerance.</P> [FIG OMISSION]</BR>
A 32nm EGPU Parallel Multiprocessor Based on Co-issue and Multi-Dimensional Parallelism Architecture
Yang Wang,Li Zhou,Tao Sun,Yanhu Chen,Jia Wang,Yuanzhi Zhang,Yuanyuan Gao 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5
In this paper, a Parallel Multiprocessor (PM) based on SIMT (Single Instruction and Multiple Threads) architecture is proposed. With co-issue architecture and multi-dimensional parallelism implemented in high-effective PM, Embedded Graphics Processing Unit (EGPU) provides great performance for various situations, such as general purpose computing, 3D scene rendering, and graphics processing. Application programs are departed into separated threads. Allocated by Thread Processing Unit (TPU), separated threads can be executed in parallel. Parallelism in different hierarchy and dimension are implemented by Multi-Dimensional Parallelism Processor (MD-PP), which has made a proper trade-off between performance and cost. Additionally, PM improves the hardware occupancy with its co-issue architecture and internal bus accessing mechanism to meet the demand of processing capability. Its unified shading architecture also helps to hide processing latency. PM can execute 4 basic operations in the best case and 2 in the worst case within each clock cycle. With 32nm process technology and 200MHz clock frequency, PM’s area is about 5104494um2, power consumption is about 101.838mW, and it can process nearly 28M vertices or fragments in average. Experimental results show that the MD-PP based PM can process data with high performance and get a balance between efficiency and hardware consumption simultaneously.
Xiaoping Yin,Shanshan Zhao,Bin Yan,Yanhe Tian,Teer Ba,Jiangguo Zhang,Yuanzhi Wang 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.5
The Alataw Pass, near the Ebinur Lake Wetland (northwest of China) and Taldykorgan (east of Kazakhstan), is a natural habitat for wild rodents. To date, little has been done on the surveillance of Bartonella spp. and Wolbachia spp. from fleas in the region. Here we molecularly detected Bartonella spp. and Wolbachia spp. in wild rodent fleas during January and October of 2016 along the Alataw Pass-Kazakhstan border. A total of 1,706 fleas belonging to 10 species were collected from 6 rodent species. Among the 10 flea species, 4 were found to be positive for Wolbachia, and 5 flea species were positive for Bartonella. Molecular analysis indicated that i) B. rochalimae was firstly identified in Xenopsylla gerbilli minax and X. conforms conforms, ii) B. grahamii was firstly identified in X. gerbilli minax, and iii) B. elizabethae was firstly detected in Coptopsylla lamellifer ardua, Paradoxopsyllus repandus, and Nosopsyllus laeviceps laeviceps. Additionally, 3 Wolbachia endosymbionts were firstly found in X. gerbilli minax, X. conforms conforms, P. repandus, and N. laeviceps laeviceps. BLASTn analysis indicated 3 Bartonella species showed genotypic variation. Phylogenetic analysis revealed 3 Wolbachia endosymbionts were clustered into the non-Siphonaptera Wolbachia group. These findings extend our knowledge of the geographical distribution and carriers of B. rochalimae, B. grahamii, B. elizabethae, and Wolbachia spp. In the future, there is a need for China-Kazakhstan cooperation to strengthen the surveillance of flea-borne pathogens in wildlife.