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Influence of the Electrolytic Dy-Cu alloy on the Coercivity of Sintered Nd-Fe-B Magnet
Chun-fa Liao,Xun Zhou,Peng Jiang,Zhiyong Zeng,Lianghua Que 한국자기학회 2022 Journal of Magnetics Vol.27 No.4
The fluorine salt oxide molten-salt electrolytic Dy-Cu alloy was used as a grain boundary diffusion source instead of the doped Dy-Cu alloy. The microstructure and coercivity of the GBDPed magnets with the different diffusion times were studied. The results show that the coercivity increased with the increase in the GBDP time. The ability of the electrolytic Dy-Cu alloy to improve the coercivity of Nd-Fe-B is more advantageous than that of the doped Dy-Cu alloy. Microstructure analysis shows that the segregation and metal inclusion, a small amount of Dy2O3, and the poor synergy diffusion between Dy and Cu lead to the unsatisfactory performance of the doped Dy-Cu alloy to improve the coercivity. The diffusion rate and depth of the GBD source improved by replacing the doped alloy with an electrolytic alloy.
Effects of Chinese Sport Tourists’ Perceptions toward Service Quality in Jeju Island
Zeng, Shiheng,Chun, Sung-Bum,Chiu, Weisheng,Park, Chanmin,Lee, Chul Won Canadian Center of Science and Education 2017 Asian Social Sceince Vol.13 No.4
<P>Purpose:This study proposed a research model to examine the effect of the service quality of the sport tourism industry on Chinese tourists’ satisfaction and future intention and subjective well-being in Jeju Island. Methodology:Data were recruited from 349 Chinese tourists, who participated in sport activities in Jeju Island. Findings:The findings indicate the physical environment quality and outcome quality have positive influences on tourist satisfaction. Tourist satisfaction significantly and positively influenced tourists’ future behavioral intentions and subjective well-being. All Chinese respondents positively evaluated the service quality in Jeju Island. Value:This study contributes to the understanding of the sports tourism industry targeting Chinese tourists in Jeju Island.</P>
Passive Smoking and Cervical Cancer Risk: A Meta-analysis Based on 3,230 Cases and 2,982 Controls
Zeng, Xian-Tao,Xiong, Ping-An,Wang, Fen,Li, Chun-Yi,Yao, Juan,Guo, Yi Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.6
Objective: Passive smoking has been considered as a risk factor of many cancers. To examine whether it might also pose a risk for cervical cancer, we performed a meta-analysis based on published case-control studies. Methods: We searched the PubMed database and references of included studies up to February 10th, 2012 for relevant studies. After two authors independently assessed the methodological quality and extracted data, a meta-analysis was conducted using CMA v2 software. Publication bias was evaluated by funnel plot, using Egger's and Begg's tests. Results: Finally 11 eligible studies yielded, involving 3,230 cases and 2,982 controls. The results showed that women who never smoke but exposed to smoking experience a 73% increase in risk of cervical cancer compared with non-exposed women (OR = 1.73, 95% CI = 1.35 - 2.21, p<0.001). Subgroup and sensitivity analyses indicated this result to be robust. Moderate publication bias was detected by visualing funnel plot, Egger's and Begg's tests. Conclusion: Based on currently available evidence, the findings of this meta-analysis suggests that passive smoking significantly and independently increases the risk of cervical cancer.
Effect of fenpropathrin on the viability and homing ability of worker bees Apis mellifera
Chun-hua Liao,Jie Wu,Zi-long Wang,Zhi Jiang Zeng,Xiaobo Wu 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
To explore the effect of fenpropathrin on survival and homing ability of honeybees Apis mellifera L., the newly emerged honeybee workers (< 12 h old) were randomly divided into 4 groups with 3 replicates in each group. Fenpropathrin (1/2 LD50, 1/4 LD50, 1/8 LD50 and 0% LD50) was added on the thorax of the bees. The viability of worker bees and their homing rate at 1 km distance away from colonies were analyzed, and the expression levels of two memory related genes (GluRA and Nmdar 1) in 20-day–old worker bees were also quantified. Overall, the lifespan and homing rates were significantly decreased with the increase of fenpropathrin dose (P < 0.05), but there was no significant difference between the least group (1/8 LD50) and the control group (0% LD50) (P > 0.05). The relative expression of Nmdar1 was decreased significantly with the increasing doses of fenpropathrin and the lower expression level of Nmdar 1 was found in the fenpropathrin-treaded groups. The expression level of GluRA of workers in 1/8 LD50 group and the control group were significantly higher than that in 1/2 LD50 group and 1/4 LD50 group (P < 0.05), whereas the expression level of GluRA of workers in 1/4 LD50 group was significantly higher than that in 1/2 LD50 group (P < 0.05), and there is no significant difference between 1/8 LD50 group and the control group (P > 0.05). In conclusion, the use of fenpropathrin for agricultural crops may show negative influence on the viability and homing ability of worker bees Apis mellifera L.
Chunli Lu,Longbing Ma,Chenghua Yuan,Lei Cheng,Xinyu Wang,Wanru Duan,Kai Wang,Zan Chen,Hao Wu,Gao Zeng,Fengzeng Jian 대한척추신경외과학회 2022 Neurospine Vol.19 No.3
Objective: The specific association between morphometric characteristics of the syrinx and the prognosis of Chiari malformation type I (CM-I) with syringomyelia following surgical procedure seems to have not been fully elaborated. This study focused on the preoperative clinical and radiologic parameters in CM-I patients with syringomyelia to find out the relationship between the patients’ clinical status and the phenotypes of the syrinx with surgical outcome. Methods: A continuous series of pediatric and adult patients with CM-I and syringomyelia from a prospectively maintained database in a single center were included, and we explored the related factors affecting the prognosis following decompression surgery through retrospective analysis of clinical presentations, imaging characteristics, and the morphological features of syringomyelia, to provide a clinical reference for the treatment of syringomyelia. Results: There were 28 pediatric patients (13.8%), and 174 adults (86.2%) included in our study. The average Chicago Chiari Outcome Scale score was 14.56 ± 1.78. The overall prognosis after surgery was good in our series, among them 152 cases (75.25%) with a favorable prognosis, and syrinx was resolved effectively in 172 cases (85.15%). According to the univariate and multivariate analyses, the preoperative symptom duration, observation time, and with/without moniliform type were independent factors affecting the prognosis in adults. The most obvious difference between moniliform type and nonmoniliform type lies in the preoperative symptom duration, ventral subarachnoid space at the foramen magnum, and with/without straightened cervical physio-curve. Conclusion: Timely decompression surgery could achieve a better outcome in CM-I patients with syringomyelia. Moniliform syringomyelia may suggest a relatively better prognosis.
DBOP specifies palea development by suppressing the expansion of the margin of palea in rice
Chun-Hai Shi,Dong-Dong Zeng,Ran Qin,Md. Alamin,Rong Liang,Cheng-Cong Yang,Xiao-Li Jin 한국유전학회 2016 Genes & Genomics Vol.38 No.11
Palea and lemma are grass specific floral organs, and their identities to the typical floral organs in eudicots remains unclear. In the present study, we identified and characterized a defective body of palea (dbop) from ethyl methyl sulfonate mutagenesis lines of Oryza sativa ssp. japonica cv. Nipponbare. The dbop mutant exhibited abnormal palea without the body of palea. By map-based cloning, the DBOP was narrowed down to a 68.9 kb interval on the long arm of chromosome 9. Sequencing result showed that there was G to A substitution and C to A substitution at the 245th and 383rd nucleotide of LOC_Os09g24480 coding sequence region, respectively. DBOP was found allelic to the RETARDED PALEA1 (REP1) gene which encoded a TCP family transcription factor. DBOP/REP1 might specify palea development by suppressing the expansion of the margin of palea.
Jian Zeng,Xing Fan,Hai-Qin Zhang,Li-Na Sha,Hou-Yang Kang,Li Zhang,Rui-Wu Yang,Chun-Bang Ding,Yong-Hong Zhou 한국유전학회 2012 Genes & Genomics Vol.34 No.5
Interspecies hybridization has been frequently observed in the tribe Triticeae. Natural hybridization between Kengyilia and Roegneria or Elymus species has not been reported as yet. Several sterile wheatgrass individuals exhibiting intermediately morphological traits between Kengyilia and Roegneria or Elymus species were identified in the meadow of Sichuan and Gansu provinces in China, suggesting their natural hybrid origin. The putative hybrids were analyzed by using the sequences of ITS and trnH-psbA together with cytological observation in order to assess the origin of hybrids. Both ITS and cytological data revealed the evidence of allopolyploid origin and confirmed the presence of StStYYP and StStYYHP genomes in the putative natural hybrids. The data suggest that the StStYYP hybrid originated from hybridization between Kengyilia and Roegneria and the hybrid with StStYYHP originated from hybridization between Kengyilia and Elymus. Chloroplast sequence data demonstrated that K. rigidula and K. melanthera were the likely maternal donors in the hybridization events.