Modeling of damage in cement paste subject to external sulfate attack

Chuansheng Xiong,Linhua Jiang,Yan Zhang,Hongqiang Chu 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.16 No.6

This study aimed to develop models of sulfate diffusion and ettringite content profile in cement paste for the predication of the damage behavior in cement paste subject to external sulfate. In the models, multiphase reaction equilibrium between ions in pore solution and solid calcium aluminates phases and the microstructure changes in different positions of cement paste were taken into account. The distributions of expansive volume strain and expansion stress in cement paste were calculated based on the ettringite content profile model. In addition, more sulfate diffusion tests and SEM analyses were determined to verify the reliability and veracity of the models. As the results shown, there was a good correlation between the numerical simulation results and experimental evidences. The results indicated that the water to cement ratio (w/c) had a significant influence on the diffusion of sulfate ions, ettringite concentration profile and expansion properties in cement paste specimens. The cracking points caused by ettringite growth in cement paste specimens were predicted through numerical methods. According to the simulation results, the fracture of cement paste would be accelerated when the specimens were prepared with higher w/c or when they were exposed to sulfate solution with higher concentration.

叶圣陶1914年的三篇小说佚作

金传胜 ( Jin Chuansheng ) 숭실대학교 인문과학연구소 2019 인문학연구 Vol.48 No.-

새로 발견된 《暮鍾斷韻》과 《浮沉》, 《無告孤雏》는 모두 葉聖陶가 초창기에 창작했던 遺失된 文言小說作品이다. 내용 주제면에서 세 편의 소설작품은 葉氏의 다른 작품과는 태생적으로 함께 공유하는 “互文(서로의 문장 속에 동일한 문장이 나오는 현상)”現象이 나타나 있다. 예술기교 측면에서 볼 때에, 《暮鐘斷韻》은 심리묘사에 뛰어나고, 《無告孤雛》는 서스펜스의 설정과 인물 대화 측면에서 독창성을 가지고 있으며, 《浮沉》은 교묘한 揷入敍述技法을 운용하여 구두수선공을 대하는 소년 태도의 전후 변화와 명확한 對比技法을 통해 주제를 표현하고 있다. 이 세 작품의 사상 예술 수준은 다소 차이가 있고 장단점이 모두 드러나 있다. 이들 중에서 특히《無告孤雛》가 가장 뛰어난 작품이라 할 수 있는데, 작품의 주제는 사실적인 필치로 표현되어 있으며 虛構 속에 드러나지는 않았다. 이런 측면에서《無告孤雛》를 葉聖陶 초기작품 중의 대표작으로 간주하기도 한다. Evening Bells, Ups and Downs and Helpless Orphan are three newly-found short stories of Ye Shengtao. Interms of content, the three novels have a natural intertextual relationship with Ye’s other works. In terms of artistic skills, the novel Evening Bells is good at psychological description, while the novel Helpless Orphan is characterized by suspense and dialogue, and Ups and Downs uses the technique of narrations killfully to draw out the main idea from the changes and sharp contrast of young people’s attitude towards shoemakers. Their ideological and artistic level is slightly discrepant, and Helpless Orphan is the best, which can be regarded as one of the representative works of Ye Shengtao Js early works, in the sense of “the aim is realism, notfiction”.

Hair follicles transcriptome profiles in Bashang long-tailed chickens with different plumage colors

Xiaohui Liu,Rongyan Zhou,Yongdong Peng,Chuansheng Zhang,Lanhui Li,Chunxiang Lu,Xianglong Li 한국유전학회 2019 Genes & Genomics Vol.41 No.11

Despite the rich variety in plumage color found in nature, genetic studies on how hair follicles affect pigmentation are often limited to animals that have black and white pigment. To test how gene expression influences plumage color, transcriptomes of chicken hair follicles with white, black, hemp, reed catkins, silvery grey, and landscape plumage colors were generated using Illumina sequencing. We generated six RNA-Seq libraries with over 25 million paired-end clean reads per library with percentage of paired-end clean reads ranging from 96.73 to 96.98%. 78% of the reads mapped to the chicken genome, and approximately 70% of the reads were mapped to exons and 6% mapped to introns. Transcriptomes of hair follicles producing hemp and land plumage were similar, but these two showed moderate differences compared with gray and reed colored plumage. The black and white follicle transcriptomes were most divergent from the other colors. We identified several candidate genes, including GPNMB, PMEL, TYRP1, GPR143, OCA2, SOX10, SLC45A2, KRT75, and TYR . All of these genes are known to induce pigment formation in mice. White feathers result from the lack of pigment formation, and our results suggest that the white chickens due to the recessive insertion mutation of TYR . The formation of black area size and color depth may be due to the expression levels of GPNMB, PMEL, TYRP1, GPR143, OCA2, SOX10, SLC45A2, KRT75, and TYR . The GO analysis of the differentially expressed genes (DEGs) revealed that DEGs in our transcriptome analysis were enriched in cytoskeleton and cell structure related pathways. The black plumage transcriptome showed significant differences in melanogenesis, tyrosine metabolism, and riboflavin metabolism compared with transcriptomes of other plumage colors. The transcriptome profiles of the different chicken plumage colors provide a valuable resource to understand how gene expression influences plumage color, and will be an important resource for identifying candidate genes in breeding programs.

ARCHITECTURE OF FLOWER-LIKE rGO/CNTs-LOADED CuxO NANOPARTICLES AND ITS PHOTOCATALYTIC PROPERTIES

BIN ZENG,XIAOHUA CHEN,XUTAO NING,CHUANSHENG CHEN,HUI LONG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.5

Novel flower-like composite architecture was successfully synthesized by spray drying and post-calcinating method for the first time. Scanning electron microscopy and transmission electron microscopy observations confirmed that reduced graphene oxides/carbon nanotubes hybrid (rGO/CNTs) formed a flower-like micrometer structure and Cu2O, CuO (CuxO, x = 1 or 2) nanoparticles were decorated inside them. The photocatalytic properties were further investigated by evaluating the photodegradation of a pollutant methyl orange (MO). The experimental results indicated that this novel architecture enhanced photocatalytic performance with 96.2% decomposition of MO after 25 min in the presence of H2O2 under visible light irradiation, which was much higher than that of CuxO powders (33.2%). This could be attributed to the more efficient adsorption of MO molecules on flower-like rGO/CNTs and provide a high concentration of MO near to the CuxO nanoparticles, thus promoting the photocatalytic degradation process.

Spontaneous Pneumomediastinum: A Probable Unusual Complication of Coronavirus Disease 2019 (COVID-19) Pneumonia

Jing Wang,Xiaoyun Su,Tianjing Zhang,Chuansheng Zheng 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.5

Studies on the dynamic characteristics of the bolted boom in a plant protection machine

Lei Yang,Yupeng Jin,Tang Chuansheng,Shunzeng Wang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6

The retractable spray boom is one of the key components in a plant protection machine, which is assembled from beams of different length held together with bolting. In order to determine the dynamic characteristics of the bolted boom in a plant protection machine, the reduced order model of the bolted boom with a four-parameter Iwan model was established and confirmed by experiments. Based on the static and dynamic characteristics of the bolted boom, it is indicated that the boom with the Iwan element shows a stronger damping and higher frequency. The influence of the system parameters on the amplitude of the steady-state responses in output points was also explored, which shows the interplay among the excitation force, the parameters of the Iwan element and the linear modal damping ratio. The work provides a deeper insight into the more detailed response characteristics of the bolted boom in plant protection machines.

Meta-mordant Dyeing with Camellia sinensis (L.) O. Ktze var. waldensae (S.Y.Hu) Chang (Yellow-bud Tea) Extract for Wool Fabrics Treated by UV Radiation

Cheng Chen,Min Li,Chunxia Wang,Shaohai Fu,Wenjun Yan,Chuansheng Chen 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6

The wool fabrics were treated by ultraviolet (UV) radiation and then dyed with Camellia sinensis (L.) O. Ktze var. waldensae (S.Y.Hu) Chang (yellow-bud tea) extract using meta-mordant dyeing method. The results indicated that the hydrophilicity of wool fabrics was improved after UV radiation treatment, which was conducive in improving color performance for the meta-mordant dyeing with yellow-bud tea extract of wool fabrics. The optimal dyeing process was that the powdered extract (5.0 % o.w.f) and the CuSO4 (2.0 % o.w.f) were added to the dyeing liquor, the pH value was adjusted to 3.5-4.0 by HCOOH, the wool fabrics treated by UV radiation for 10 min and then were dyed at a bath ratio of 1:50 under 95 oC for 70 min. By means of three-factor quadratic current rotation revolving design (TQCRRD) method, the computation results of the mathematical equations and models indicated that UV radiation was the most important factor for meta-CuSO4 dyeing with yellow-bud tea extract for wool fabrics.

Illumina-sequencing based transcriptome study of coat color phenotypes in domestic goats

Yongdong Peng,Xiaohui Liu,Liying Geng,Ruxue Ma,Lisha Li,Jingshi Li,Chuansheng Zhang,Zhengzhu Liu,Yuanfang Gong,Xianglong Li 한국유전학회 2017 Genes & Genomics Vol.39 No.8

This study performed a comprehensive expression profiling of genes expressed in the skin of goats with three different coat colors by Illumina Sequencing. A total of 91 significantly expressed genes were detected when comparing gray skin to white skin library and these included 74 up-regulated and 17 down-regulated genes in gray skin. There were 67 differentially expressed genes between brown skin and white skin libraries, 23 of which were up-regulated and 44 were down-regulated in brown skin. When we compared brown and gray libraries, 154 differentially expressed genes were found, of which 33 showed higher expression and 121 showed lower expression in brown skin. To our surprise, MC1R, MITF, TYR and KIT showed no significant difference in expression between the goats with three skin colors, whereas ASIP was detected in white skin but not in dark skins. In this study, PMEL, TRPM1, TYRP1 and DCT were significantly upregulated in brown goat skin compare with gray and white skins. PMEL showed higher expression in gray goat skin compared with white goat skin, whereas there were no significant differences in the expression of TYRP1, TRPM1 and DCT between gray and white skin samples. In addition, ELOVL3 showed higher expression in gray goat skin than in brown and white skins, whereas there was no significant differences in the expression of ELOVL3 between brown and white skin samples. These results expand our understanding of the complex molecular mechanisms of skin physiology and melanogenesis in goat and provide a foundation for future studies.

Use of Magnetic Resonance Neurography for Evaluating the Distribution and Patterns of Chronic Inflammatory Demyelinating Polyneuropathy

Xiaoyun Su,Xiangquan Kong,Zuneng Lu,Min Zhou,Jing Wang,Xiaoming Liu,Xiangchuang Kong,Huiting Zhang,Chuansheng Zheng 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.4

Objective: To evaluate the distribution and characteristics of peripheral nerve abnormalities in chronic inflammatory demyelinating polyneuropathy (CIDP) using magnetic resonance neurography (MRN) and to examine the diagnostic efficiency. Materials and Methods: Thirty-one CIDP patients and 21 controls underwent MR scans. Three-dimensional sampling perfections with application-optimized contrasts using different flip-angle evolutions and T1-/T2- weighted turbo spinecho sequences were performed for neurography of the brachial and lumbosacral (LS) plexus and cauda equina, respectively. Clinical data and scores of the inflammatory Rasch-built overall disability scale (I-RODS) in CIDP were obtained. Results: The bilateral extracranial vagus (n = 11), trigeminal (n = 12), and intercostal nerves (n = 10) were hypertrophic. Plexus hypertrophies were observed in the brachial plexus of 19 patients (61.3%) and in the LS plexus of 25 patients (80.6%). Patterns of hypertrophy included uniform hypertrophy (17 [54.8%] brachial plexuses and 21 [67.7%] LS plexuses), and multifocal fusiform hypertrophy (2 [6.5%] brachial plexuses and 4 [12.9%] LS plexuses) was present. Enlarged and/or contrast-enhanced cauda equina was found in 3 (9.7%) and 13 (41.9%) patients, respectively. Diameters of the brachial and LS nerve roots were significantly larger in CIDP than in controls (p < 0.001). The largest AUC was obtained for the L5 nerve. There were no significant differences in the course duration, I-RODS score, or diameter between patients with and without hypertrophy. Conclusion: MRN is useful for the assessment of distribution and characteristics of the peripheral nerves in CIDP. Compared to other regions, LS plexus neurography is more sensitive for CIDP.