http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오늘 본 자료
The K\"{a}hler Different of a Set of Points in~$\pmpn$
Nguyen T. Hoa,Tran N. K. Linh,Le N. Long,Phan T. T. Nhan,Nguyen T. P. Nhi 대한수학회 2022 대한수학회보 Vol.59 No.4
Given an ACM set $\X$ of points in a multiprojective space $\pmpn$ over a field of characteristic zero, we are interested in studying the K\"ahler different and the Cayley-Bacharach property for $\X$. In $\bbP^1\times \bbP^1$, the Cayley-Bacharach property agrees with the complete intersection property and it is characterized by using the K\"ahler different. However, this result fails to hold in $\pmpn$ for $n>1$ or $m>1$. In this paper we start an investigation of the K\"ahler different and its Hilbert function and then prove that $\X$ is a complete intersection of type $(d_1,\ldots,d_m,d'_1,\ldots,d'_n)$ if and only if it has the Cayley-Bacharach property and the K\"ahler different is non-zero at a certain degree. We characterize the Cayley-Bacharach property of $\X$ under certain assumptions.
Buckling resistance of axially loaded square concrete-filled double steel tubular columns
Junchang Ci,Mizan Ahmed,Viet-Linh Tran,Hong Jia,Shicai Chen,Tan N. Nguyen 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.6
Thin-walled square concrete-filled double steel tubular (CFDST) columns composed of the inner circular tube filled with concrete can be used to carry the large axial loads or strengthen existing CFST columns in composite constructions. This paper reports an experimental program carried out on short square CFDST columns loaded concentrically. The influences of important column parameters on the post-buckling performance of such columns are investigated. Test results exhibit that the inner circular tube significantly improves the ultimate loads and the ductility of such columns compared to conventional concrete-filled steel tubular (CFST) and double-skin CFST (DCFST) columns with an inner void. A mathematical model developed is used to simulate the ultimate strengths and load-strain curves of such columns loaded axially. Furthermore, the ultimate strengths of such columns are predicted using existing codified design models for conventional CFST columns as well as the formulas proposed by previous researchers and compared against a large database comprising 500 CFDST columns. Lastly, an accurate artificial neural network model is developed for the practical applications of such columns under axial loading.
Ly H. Luu,Pham Hang L. B.,Huynh Hue T. T.,Nguyen Linh N.,Vu Trinh T.,Le Hien T. T. 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.2
Panax vietnamensis Ha et Grushv., an important medicinal plant in Vietnam, consists of several valuable ginsenosides. Compared to other Panax species, molecular and in silico studies concerning its transcriptomes and ginsenoside biosyn- thesis-related genes are still lacking. In this study, the transcriptomes of 1-year-old leaves and roots of P. vietnamensis were sequenced and analyzed using the Illumina system. The expression of the selected ginsenoside biosynthesis-related genes was confirmed using real-time PCR. In total, 42,724, 41,564, and 43,021 unigenes were assembled for leaves, roots, and leaf and root tissues, respectively. More than 60% of the unigenes from both tissues were functionally annotated using at least one database from the Kyoto encyclopedia of genes and genomes, Pfam, gene ontology, the National Center for Biotechnol- ogy Information (NCBI) non-redundant protein sequence database, and the evolutionary genealogy of genes. Furthermore, the expression of the predominant transcripts in each cDNA library was analyzed and identified. In addition, 457 unigenes encoding the enzymes involved in ginsenoside biosynthesis were identified. Most genes encoding enzymes related to ginse- noside biosynthesis via both MVA and non-MVA pathways are indicated. Quantitative PCR analysis showed that β-amyrin synthase (β-AS), cytochrome P450 (CYP716A53v2, CYP716A52v2), and UDP-glycosyl transferase (UGT74AE2) were highly expressed, more so in the roots than in the leaves. Our results may answer the question of how genes are expressed and whether ginsenosides are produced and accumulated in the first growing year of P. vietnamensis leaves and roots. This first comprehensive transcriptome data of 1-year-old leaves and roots of P. vietnamensis is useful for further investigation of gin- seng development, biosynthesis, major secondary metabolite pathways, and related gene expression in different tissues and developmental stages. Data also provide useful information for improving ginseng biosynthesis using biotechnology tools.