WEAK α-SKEW ARMENDARIZ RINGS

Cuiping Zhang,Jianlong Chen 대한수학회 2010 대한수학회지 Vol.47 No.3

For an endomorphism α of a ring R, we introduce the weak α-skew Armendariz rings which are a generalization of the α-skew Armendariz rings and the weak Armendariz rings, and investigate their properties. Moreover, we prove that a ring R is weak α-skew Armendariz if and only if for any n, the n × n upper triangular matrix ring Tn(R) is weak ¯α-skew Armendariz, where ¯α : Tn(R)→ Tn(R) is an extension of α. If R is reversible and α satisfies the condition that ab = 0 implies aα(b)=0 for any a, b ∈ R, then the ring R[x]/(xn) is weak ¯α-skew Armendariz,where (xn) is an ideal generated by xn, n is a positive integer and ¯α : R[x]/(xn)→ R[x]/(xn) is an extension of α. If α also satisfies the condition that αt = 1 for some positive integer t, the ring R[x] (resp,R[x; α]) is weak ¯α-skew (resp, weak) Armendariz, where ¯α : R[x] → R[x]is an extension of α.

PF4V1 affects the progression of oral squamous cell carcinoma by regulating Wnt/ β‑catenin pathway and angiogenesis

Cuiping Li,Weidong Jiang,Yang Zhou,Xuanping Huang,Nuo Zhou 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.2

Platelet factor-4 variant 1 (PF4V1) was recently described as a natural non-allelic gene variant of platelet factor-4 (PF4), which has been closely associated with the growth and metastasis of various cancers. Our previous research showed that PF4V1 was related to oral squamous cells carcinoma (OSCC) metastasis. Howerver, it is still not clear about the functional role of PF4V1 in OSCC. In this study, stably transfected cell lines were constructed and the expression level of PF4V1 was verified by real‐time polymerase chain reaction (RT-PCR) and western blot. The effect of PF4V1 on proliferation, migration, invasion, and apoptosis of oral cancer (OC) cells were detected. Moreover, a xenograft tumor model was constructed to evaluate the effect of PF4V1 on OSCC in vivo. Indicators of Wnt/β-catenin, angiogenesis and epithelial-mesenchymal transition (EMT) pathways were also examined. Stable cell lines with overexpression and inhibited expression of PF4V1 were constructed successfully. After stable transfection, PF4V1 significantly promoted the proliferation, migration, and invasion of OC cells in vitro, and their tumor formation in vivo. Furthermore, PF4V1 remarkably promoted the expression of β-catenin, VEGF, and FGF but suppressed the expression of GSK-3β. There was no statistically significant correlation between PF4V1 and EMT pathway. This study provides evidence that PF4V1 promotes the proliferation, migration, invasion and tumor formation of OC cells by regulating the Wnt/β-catenin pathway and angiogenesis. Our findings suggest that PF4V1 could be a very promising target of OSCC therapy in the future.

A Method of Zero self-modification and Temperature Compensation for Indoor Air Quality Detection Based on a software Model

Cuiping Li,Jiuqiang Han,Qibin Huang,Xiaoqiang Dong,Xuequan Ding,Yaming Ding,Dianguo Zhang,Ning Mu 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

It is very difficult to apply non-dispersive infrared sensor to detect the indoor air quality and maintain very low zero and temperature drift over long periods. Frequently manual zero setting and calibration are required. To solve the issues of zero and temperature drift of non-dispersive infrared sensor, a software model based on zero gas intensity, reference channels intensity, standard temperature, environmental temperature, temperature drift coefficient, etc. has been established to automatically modify and compensate the zero and temperature drift existing in the long-term continuous operation of the infrared sensor. The test result and long-term application indicate the detection precision of the instrument is less than 5%F.S in various changing environmental conditions. The average detection precision of carbon dioxide has been improved from 9.26% before comprehensive processing to 1.23% after processing, while the average detection precision of methane has been improved from 10.61% before comprehensive processing to 0.70% after processing. As a result, the disadvantages existing in many gas detectors including poor stability and short calibration cycle have been overcome, thus effectively improving the detection precision and stability of the instrument and reducing the maintenance cost.

Controlled synthesis of porous Ni-doped SnO₂ microstructures and their enhanced gas sensing properties

Gu, Cuiping,Guan, Wenmei,Liu, Xiaosi,Gao, Lvlv,Wang, Liyou,Shim, Jae-Jin,Huang, Jiarui ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.692 No.-

<P><B>Abstract</B></P> <P>Porous Ni-doped SnO<SUB>2</SUB> microspheres and microcubes were obtained via a facile chemical solution route followed by calcination and acid-washing process. Their structural and morphological evolution was characterized using a range of techniques. The process of inducing porosity began with crystalline single-phase NiSn(OH)<SUB>6</SUB> precursors formed by the co-precipitation of metal ions from an aqueous solution. Thermal decomposition of the precursors led to an intimate mixture of cubic phase NiO and tetragonal phase SnO<SUB>2</SUB>. The Ni-doped SnO<SUB>2</SUB> microspheres and microcubes were obtained after a simple acid-washing process. A decomposition–aggregation–dissolution process was proposed to explain the formation of these structures. The gas-sensing properties of the as-prepared porous Ni-doped SnO<SUB>2</SUB> microspheres and microcubes for toxic volatile organic compounds, such as formaldehyde, ethanol, benzene, methanol, acetone, and toluene, were investigated. The enhanced sensing performance of the porous Ni-doped SnO<SUB>2</SUB> microspheres was demonstrated. The detection limits of formaldehyde and ethanol were approximately 0.17 and 0.09 ppm (signal-to-noise ratio, S/N = 3), respectively. The enhanced sensing performance of the porous Ni-doped SnO<SUB>2</SUB> microspheres was attributed to their Ni-dopant, unique porous structure and large surface area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous Ni-doped SnO<SUB>2</SUB> microstructures were obtained by treatment of the precursors. </LI> <LI> Porous Ni-doped SnO<SUB>2</SUB> microstructures exhibited excellent gas-sensing properties. </LI> <LI> Excellent gas-sensing properties were attributed to the Ni-dopant and 3D structures. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Porous Ni-doped SnO<SUB>2</SUB> microspheres and microcubes, obtained by a facile chemical solution route followed by calcination and acid-washing, showed excellent gas-sensing performances.</P> <P>[DISPLAY OMISSION]</P>

WEAK α-SKEW ARMENDARIZ RINGS

Zhang, Cuiping,Chen, Jianlong Korean Mathematical Society 2010 대한수학회지 Vol.47 No.3

For an endomorphism $\alpha$ of a ring R, we introduce the weak $\alpha$-skew Armendariz rings which are a generalization of the $\alpha$-skew Armendariz rings and the weak Armendariz rings, and investigate their properties. Moreover, we prove that a ring R is weak $\alpha$-skew Armendariz if and only if for any n, the $n\;{\times}\;n$ upper triangular matrix ring $T_n(R)$ is weak $\bar{\alpha}$-skew Armendariz, where $\bar{\alpha}\;:\;T_n(R)\;{\rightarrow}\;T_n(R)$ is an extension of $\alpha$ If R is reversible and $\alpha$ satisfies the condition that ab = 0 implies $a{\alpha}(b)=0$ for any a, b $\in$ R, then the ring R[x]/($x^n$) is weak $\bar{\alpha}$-skew Armendariz, where ($x^n$) is an ideal generated by $x^n$, n is a positive integer and $\bar{\alpha}\;:\;R[x]/(x^n)\;{\rightarrow}\;R[x]/(x^n)$ is an extension of $\alpha$. If $\alpha$ also satisfies the condition that ${\alpha}^t\;=\;1$ for some positive integer t, the ring R[x] (resp, R[x; $\alpha$) is weak $\bar{\alpha}$-skew (resp, weak) Armendariz, where $\bar{\alpha}\;:\;R[x]\;{\rightarrow}\;R[x]$ is an extension of $\alpha$.

Investigation on Chain Transfer Reaction of Benzene Sulfonyl Chloride in Styrene Radical Polymerization

Li, Cuiping,Fu, Zhifeng,Shi, Yan The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.8

The free radical polymerization of styrene was initiated with azobis(isobutyronitrile) in the presence of benzene sulfonyl chloride. Analysis of the terminal structures of the obtained polystyrene with $^1H$ NMR spectroscopy revealed the presence of a phenyl sulfonyl group at the ${\alpha}$-end and a chlorine atom at the ${\omega}$-end of each polystyrene chain. The terminal chlorine atom in the polystyrene chains was further confirmed through atom transfer radical polymerization (ATRP) of styrene and methyl acrylate using the obtained polystyrenes as macroinitiators and CuCl/2,2'-bipyridine as the catalyst system. GPC traces of the products obtained in ATRP at different reaction times were clearly shifted to higher molecular weight direction, indicating that nearly all the macroinitiator chains initiated ATRP of the second monomers. In addition, the number-average molecular weights of the polystyrenes increased directly proportional to the monomer conversions, and agreed well with the theoretical ones.

Synthesis of hierarchical α-Fe₂O₃ nanotubes for high-performance lithium-ion batteries

Gu, Cuiping,Song, Xinjie,Zhang, Simin,Ryu, Si Ok,Huang, Jiarui Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.714 No.-

<P><B>Abstract</B></P> <P>Hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes are facially synthesized via a sacrificial template strategy without chemical etching, and are then employed as the anode material for lithium-ion batteries (LIBs). FeC<SUB>2</SUB>O<SUB>4</SUB>·2H<SUB>2</SUB>O nanorods are used as the sacrificial template to prepare nanotubes consisting of numerous nanosheets. The resultant hierarchical hollow structures possess an inter-diameter range of 400–600 nm and exhibit a large specific surface area. The as-prepared hierarchical nanotubes demonstrate remarkable improvement in cycling stability (500 cycles) and a reversible Li<SUP>+</SUP> storage capacity as high as 764.2 mAh g<SUP>−1</SUP> at a current density of 0.5 A g<SUP>−1</SUP>. This excellent electrochemical performance suggests that the hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes prepared herein are promising candidate anode materials for LIBs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes were obtained via a sacrificial template strategy. </LI> <LI> The hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes exhibited high lithium ion storage performance. </LI> <LI> High performance was attributed to the tubular structure and large surface area. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes obtained via a sacrificial template strategy followed by calcination process, showed excellent lithium ion storage performances.</P> <P>[DISPLAY OMISSION]</P>

A Characterization of M₁-Spaces

Liu, Cuiping Department of Mathematics 2012 Kyungpook mathematical journal Vol.52 No.3

In this paper, we prove the following theorem which gives a characterization of $M_1$-spaces by g-function.

한국어교육을 위한 단순읽기관점의 활용 가능성 모색 -중국인 중급 학습자를 대상으로-

마취평 ( Ma Cuiping ),김세화 ( Kim Se Hwa ) 국제한국어교육학회 2023 한국어 교육 Vol.34 No.2

The present study aims to investigate the extent to which the Simple View of Reading (SVR) framework is applicable to the teaching and learning of Korean as a foreign language, and to explore the interplay between grammatical proficiency and reading comprehension among Korean language learners. Specifically, we recruited a sample of 102 intermediate-level Korean students from a university in China, and assessed their performance in four key language domains: grammar, decoding, listening comprehension, and reading comprehension. By conducting a regression analysis, we sought to identify the extent to which these language skills were associated with one another, and to what degree they contributed to overall reading performance. Our findings suggest a strong positive correlation between grammar, decoding, listening comprehension, and reading comprehension among Korean language learners. More importantly, our results reveal that grammar, decoding, listening comprehension exert a significant influence on reading comprehension, highlighting the importance of these skills for effective reading performance in a foreign language context. As such, we propose that the Simple View of Reading framework could be further strengthened by integrating grammatical instruction, particularly for Korean language learners who may have limited opportunities to practice their spoken language skills. (Kyung Hee University · Kyung Hee University)

Bacterial Community Structure and Function Shift in Rhizosphere Soil of Tobacco Plants Infected by Meloidogyne incognita

Wenjie Tong(Wenjie Tong),Junying Li(Junying Li),Wenfeng Cong(Wenfeng Cong),Cuiping Zhang(Cuiping Zhang),Zhaoli Xu(Zhaoli Xu),Xiaolong Chen(Xiaolong Chen),Min Yang(Min Yang),Jiani Liu(Jiani Liu),Lei Yu 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.6

Root-knot nematode disease is a widespread and catastrophic disease of tobacco. However, little is known about the relationship between rhizosphere bacterial community and root-knot nematode disease. This study used 16S rRNA gene sequencing and PICRUSt to assess bacterial community structure and function changes in rhizosphere soil from Meloidogyne incognita-infected tobacco plants. We studied the rhizosphere bacterial community structure of M. incognita-infected and uninfected tobacco plants through a paired comparison design in two regions of tobacco planting area, Yuxi and Jiuxiang of Yunnan Province, southwest China. According to the findings, M. incognita infection can alter the bacterial population in the soil. Uninfested soil has more operational taxonomic unit numbers and richness than infested soil. Principal Coordinate Analysis revealed clear separations between bacterial communities from infested and uninfested soil, indicating that different infection conditions resulted in significantly different bacterial community structures in soils. Firmicutes was prevalent in infested soil, but Chloroflexi and Acidobacteria were prevalent in uninfested soil. Sphingomonas, Streptomyces, and Bradyrhizobium were the dominant bacteria genera, and their abundance were higher in infested soil. By PICRUSt analysis, some metabolism-related functions and signal transduction functions of the rhizosphere bacterial community in the M. incognita infection-tobacco plants had a higher relative abundance than those uninfected. As a result, rhizosphere soils from tobacco plants infected with M. incognita showed considerable bacterial community structure and function alterations.