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Surface nanocrystallization and its properties of a rare earth magnesium alloy induced by HVOF―SMB
Kai-dong Xu,Ji-na Wang,Ai-hua Wang,Hua Yan,Xiang-lin Zhang,Zao-wen Huang 한국물리학회 2011 Current Applied Physics Vol.11 No.3
The nanocrystalline microstructure in the surface of a rare earth magnesium alloy induced by a new process named HVOF―SMB (high velocity oxygen-fuel flame supersonic microparticles bombarding) has been characterized by means of X-ray diffractometry (XRD) and high-resolution transmission electron microscopy (HRTEM). The effects of HVOF―SMB on mechanical properties and corrosion resistance of the magnesium alloy have been investigated by microhardness distribution and polarization curves, and the cross-sectional observation of the treated Mg alloy sample has been characterized by optical microscopy (OM). Results showed that HVOF―SMB can induce surface nanocrystallization with a grain size level less than 20 nm at topmost surface layer, and the microhardness at the top surface layer increases up to about 170 HV_0.025 which is twice more than that of the substrate. The grain size increases as well as the microhardness decreases gradually with the depth varying from surface to substrate. The potentiodynamic polarization curves indicate that the HVOF―SMB treated surfaces show lower corrosion resistance in comparison with the untreated magnesium alloy in 3.5% NaCl solution. The underlying mechanism of the electrochemical properties on the nanocrystalline Mg-based alloy’s surface induced by severe plastic deformation in corrosion resistance is discussed.
Wen Zhong-Ling,Yang Min-Kai,Fazal Aliya,Liao Yong-Hui,Cheng Lin-Run,Hua Xiao-Mei,Hu Dong-Qing,Shi Ji-Sen,Yang Rong-Wu,Lu Gui-Hua,Qi Jin-Liang,Zhi Hong,Qian Qiu-Ping,Yang Yong-Hua 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.8
In this study, two soybean genotypes, i.e., aluminum-tolerant Baxi 10 (BX10) and aluminumsensitive Bendi 2 (BD2), were used as plant materials and acidic red soil was used as growth medium. The soil layers from the inside to the outside of the root are: rhizospheric soil after washing (WRH), rhizospheric soil after brushing (BRH) and rhizospheric soil at two sides (SRH), respectively. The rhizosphere bacterial communities were analyzed by high-throughput sequencing of V4 hypervariable regions of 16S rRNA gene amplicons via Illumina MiSeq. The results of alpha diversity analysis showed that the BRH and SRH of BX10 were significantly lower in community richness than that of BD2, while the WRH exhibited no significant difference between BX10 and BD2. Among the three sampling compartments of the same soybean genotype, WRH had the lowest community richness and diversity while showing the highest coverage. Beta diversity analysis results displayed no significant difference for any compartment between the two genotypes, or among the three different sampling compartments for any same soybean genotype. However, the relative abundance of major bacterial taxa, specifically nitrogen-fixing and/or aluminum-tolerant bacteria, was significantly different in the compartments of the BRH and/or SRH at phylum and genus levels, indicating genotype-dependent variations in rhizosphere bacterial communities. Strikingly, as compared with BRH and SRH, the WRH within the same genotype (BX10 or BD2) always had an enrichment effect on rhizosphere bacteria associated with nitrogen fixation
An Iterative Algorithm for Solving the Least-Squares Problem of Matrix Equation AXB+CYD=E
Kai-juan Shen,Chuan-hua You,Yu-xia Du 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.5
In this paper, an iterative method is proposed to solve the least-squares problem of matrix equation AXB + CY D = E over un-known matrix pair [X, Y ]. By this iterative method, for any initial matrix pair [X1, Y1], a solution pair or the least-norm least-squares solution pair of which can be obtained within finite iterative steps in the absence of roundoff errors. In addition, we also consider the optimal approximation problem for the given matrix pair [X0, Y0] in Frobenius norm. Given numerical examples show that the algorithm is efficient. In this paper, an iterative method is proposed to solve the least-squares problem of matrix equation AXB + CY D = E over un-known matrix pair [X, Y ]. By this iterative method, for any initial matrix pair [X1, Y1], a solution pair or the least-norm least-squares solution pair of which can be obtained within finite iterative steps in the absence of roundoff errors. In addition, we also consider the optimal approximation problem for the given matrix pair [X0, Y0] in Frobenius norm. Given numerical examples show that the algorithm is efficient.
( Kai Chun Wu ),( Zhi Hua Ran ),( Xiang Gao ),( Minhu Chen ),( Jie Zhong ),( Jian Qiu Sheng ),( Michael A Kamm ),( Simon Travis ),( Kori Wallace ),( Nael M Mostafa ),( Marisa Shapiro ),( Yao Li ),( Ro 대한장연구학회 2016 Intestinal Research Vol.14 No.2
Background/Aims: This was a Phase 2 study (NCT02015793) to evaluate the pharmacokinetics, safety, and efficacy of adalimumab in Chinese patients with Crohn`s disease (CD). Methods: Thirty, adult Chinese patients with CD (CD Activity Index [CDAI] 220-450; high-sensitivity [hs]-C-reactive protein [CRP] ≥3 mg/L) received double-blind adalimumab 160/80 mg or 80/40 mg at weeks 0/2, followed by 40 mg at weeks 4 and 6. An open-label extension period occurred from weeks 8-26; patients received 40 mg adalimumab every other week. Serum adalimumab concentration and change from baseline in fecal calprotectin (FC) were measured during the double-blind period. Clinical remission (CDAI <150), response (decrease in CDAI ≥70 points from baseline), and change from baseline in hs-CRP were assessed through week 26. Nonresponder imputation was used for missing categorical data and last observation carried forward for missing hs-CRP/FC values. No formal hypothesis was tested. Adverse events were monitored. Results: Mean adalimumab serum concentrations during the induction phase were 13.9-18.1 μg/mL (160/80 mg group) and 7.5-9.5 μg/mL (80/40 mg group). During the double-blind period, higher remission/ response rates and greater reductions from baseline in hs-CRP and FC were observed with adalimumab 160/80 mg compared to that with 80/40 mg. Adverse event rates were similar among all treatment groups. Conclusions: Adalimumab serum concentrations in Chinese patients with CD were comparable to those observed previously in Western and Japanese patients. Clinically meaningful remission rates and improvement in inflammatory markers were achieved with both dosing regimens; changes occurred rapidly with adalimumab 160/80 mg induction therapy. No new safety signals were reported. (Intest Res 2016;14:152-163)
The effect of biogas slurry application on biomass production and the silage quality of corn
Hua Sun,Kai Shi,Hairong Ding,Chenglong Ding,Zhiqing Yang,Chen An,Chongfu Jin,Beiyi Liu,Zhaoxin Zhong,Xia Xiao,Fuyin Hou Asian Australasian Association of Animal Productio 2023 Animal Bioscience Vol.36 No.12
Objective: The objective of this study was to evaluate the effect of biogas slurry application on biomass production and the silage quality of corn. Methods: A field experiment was conducted in which corn was grown using different biogas slurry application rates. The effect of 25% to 500% biogas slurry nitrogen replacement (T1 to T14) on the yield and quality indices of corn were studied by field plot experiments. Results: The results revealed that biogas slurry application improved the stem diameter and relative feed value of corn silage in treatments T13 and T11. Moreover, the fermentation quality of corn silage was improved due to an increase in lactic acid content; in comparison with the chemical synthetic fertilizer (CF) group. The crude protein contents of corn silage had no obvious change with increasing biogas slurry application. However, the forage quality index of acid detergent fiber was decreased (p<0.05) in the T11 group compared with the CF group. In addition, higher (p<0.05) 30 h in vitro dry matter digestibility and 30 h in vitro neutral detergent fiber digestibility were observed in the T11 and T13 groups than in the CF group. Conclusion: Based on these results, it was concluded that the optimum biogas slurry application rate for corn was approximately 350% to 450% biogas slurry nitrogen replacement under the present experimental conditions.
Siang-Hua Victor Chan,Kai-Sing Alain Wong,Yat-Ming Peter Woo,Kwong-Yau Chan,Kar-Ming Leung 대한뇌혈관외과학회 2014 Journal of Cerebrovascular and Endovascular Neuros Vol.16 No.4
Objective : Several modalities are available for volumetric measurement ofthe intracranial aneurysm. We discuss the challenges involved in manualsegmentation, and analyze the application of alternative methods usingautomatic segmentation and geometric formulae in measurement of aneurysmvolumes and coil packing density. Methods : The volumes and morphology of 38 aneurysms treated withendovascular coiling at a single center were measured using three-dimensionalrotational angiography (3DRA) reconstruction software using automaticsegmentation. Aneurysm volumes were also calculated from theirheight, width, depth, size of neck, and assumed shape in 3DRA imagesusing simple geometric formulae. The aneurysm volumes were dichotomizedas "small" or "large" using the median volume of the studied population(54 mm3) measured by automatic segmentation as the cut-off valuefor further statistical analysis. Results : A greater proportion of aneurysms were categorized as being"small" when geometric formulae were applied. The median aneurysm volumesobtained were 54.5 mm3 by 3DRA software, and 30.6 mm3 usingmathematical equations. An underestimation of aneurysm volume with aresultant overestimation in the calculated coil packing density (p = 0.002)was observed. Conclusion : Caution must be exercised in the application of simple geometricformulae in the management of intracranial aneurysms as volumesmay potentially be underestimated and packing densities falsely elevated. Future research should focus on validation of automatic segmentation involumetric measurement and improving its accuracy to enhance its applicationin clinical practice.
De Novo Partial Trisomy 14 and Extra Marker Chromosome in a Newborn Male with The CHARGE Syndrome
Pen-Hua Su,Ming Chen,Jia-Yuh Chen,Suh-Jen Chen,Ju-Shan Yu,Yu-Jie Kai 한국유전학회 2007 Genes & Genomics Vol.29 No.1
The characteristic phenotype of partial trisomy 14 includes growth and developmental retardation, microcephaly, distinctive facies and anomalies of the hands and feet. In many cases, the presence of marker chromosomes complicates the phenotypic picture. We describe a ompatible with CHARGE syndrome. The patient presented with intrauterine growth retardation, coloboma, heart disease, choanae stenosis, cleft palate, corpus calosum genital anomalies, azygos anterior cerebral artery (ACA), single internal carotid artery (ICA) and ear anomalies. Cytogenetic analysis revealed trisomy 14pter→characterized by spectral karyotyping (SKY) and found to have been derived from chromosome 1. No pathogenic mutation was detected in the CHD7 gene. This case apears to be the first report of a patient having both trisomy 14 with marker chromosome 1 and the CHARGE syndrome, and it presents a unique opportunity to observe the overlaping