检索结果-南通市图书馆

Improved nuclear mass formula with an additional term from the Fermi gas model

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第5期35卷 131-138页

作者： xiao-yu xu Li Deng Ai-Xi Chen Hang Yang Amir Jalili Han-Kui Wang School of Science Zhejiang Sci-Tech UniversityHangzhou 310018China

Nuclear mass is a fundamental property of nuclear physics and a necessary input in nuclear *** to the complexity of atomic nuclei and nonperturbative strong interactions,conventional physical models cannot completely describe nuclear binding *** this study,the mass formula was improved by considering an additional term from the Fermi gas *** nuclear masses in the Atomic Mass Evaluation Database were reproduced with a root-mean-square deviation(RMSD)of -1.86 MeV(1.92 MeV).The new mass formula exhibits good performance in the neutron-rich nuclear *** RMSD decreases to 0.393 MeV when the ratio of the neutron number to the proton number is≥1.6.

关键词： Nuclear mass formula Neutron-rich nuclei Fermi-gas model

高职学生数字技能评价指标体系构建与应用研究

在线全文

学校读者我要写书评

暂无评论

黑龙江高教研究 2024年第7期42卷 127-136页

作者：余丽芹于晓旭马丹湖北工业大学湖北武汉430068

当前,教育数字化转型已成为我国教育改革发展的重要议题。职业教育如何有效融合数字技术、培养适应数字化转型升级的技术技能型人才备受关注。首先,界定了高职学生数字技能的内涵与核心要素,借鉴KSAO模型,提出了一套高职学生数字技能评... 详细信息

当前,教育数字化转型已成为我国教育改革发展的重要议题。职业教育如何有效融合数字技术、培养适应数字化转型升级的技术技能型人才备受关注。首先,界定了高职学生数字技能的内涵与核心要素,借鉴KSAO模型,提出了一套高职学生数字技能评价指标体系,包括数字基本认知、数字应用技能、数字综合能力和数字其他特质等4个一级指标和12个二级指标;其次,通过专家咨询对评价指标内容进行了修订与完善,同时采用探索性因子与验证性因子对其结构与科学性进行了验证;最后,以我国中部某省为例,应用所建立的评价指标体系探究了高职学生数字技能在整体、性别以及比赛经历等方面的水平与差异。文章既为评估高职学生数字技能水平提供了可靠依据,也为未来高职学生数字技能的培养与提升提供了有益参考。

关键词：高职学生数字技能评价指标提升路径

Syntheses and Structures of Uwo New Oxalate-bridged Transition-metal Supramolecular Polymers of [M(2-NH_2py)_2(ox)]

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第6期23卷 631-634页

作者： ZHANG xiao YI Zhi-hui xuE Ming xu Yan yu Jie-hui yu xiao-yang xu Ji-qing College of Chemistry State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University Changchun 130021 P. R. China

Two new supramoleeular polymers [ M （2-NH2 py）2 （ox） ] [ M = Co （1）, Ni （2） ; 2-NH2py = 2-aminopyridine; ox = oxalate ] were hydrothermally synthesized and characterized by elemental analyses, IR and single-crystal X-ray diffraction analyses. The isomorphic compounds 1 and 2 both possess one-dimensional zigzag chain structures, which are composed of [ M （2-NH2 py）2 ]^2＋ units bridged by tetradentate oxalate ligands to form three-dimensional supramolecular network v/a the C-H…O hydrogen bonds and π-π stacking interactions. Compound 1 displays antiferromagnetie interaction.

关键词： Crystal structure Oxalate ligand Coordination polymer Supramolecular interaction

Evaluation of spectral domain optical coherence tomography parameters in discriminating preperimetric glaucoma from high myopia

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2019年第1期12卷 58-65页

作者： xiao-yu xu Hui xiao Jing-Yi Luo Xing Liu State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen University

AIM: To evaluate the diagnostic ability of macular ganglion cell-inner plexiform layer(GCIPL) thickness o b t a i n e d b y s p e c t r a l-d o m a i n o p t i c a l c o h e r e n c e tomography(SD-OCT) in discriminating non-highly myopic eyes with preperimetric glaucoma(PPG) from highly myopic healthy eyes. METHODS: A total of 254 eyes, including 76 normal controls(NC), 116 eyes with high myopia(HM) and 62 non-highly myopic eyes with PPG were enrolled. The diagnostic ability of OCT parameters was accessed by the areas under the receiver operating characteristic(AUROC) curve in two distinguishing groups: PPG eyes with nonglaucomatous eyes including NC and HM(Group 1), and PPG eyes with HM eyes(Group 2). Differences in diagnostic performance between GCIPL and RNFL parameters were evaluated. RESULTS: The minimum(AUROC curve of 0.782), inferotemporal(0.758) and inferior(0.705) GCIPL thickness were the top three GCIPL parameters in discriminating PPG from non-glaucomatous eyes, all of which had statistically significant lower diagnostic ability than average RNFL thickness(0.847). In discriminating PPG from HM, the best GCIPL parameter was minimum(0.689), statistically significant lower in diagnostic ability than average RNFL thickness(0.789) and three other RNFL thickness parameters of temporal and inferotemporal clock-hour sectors. CONCLUSION: The minimum GCIPL thickness is the best GCIPL parameter to detect non-highly myopic PPG from highly myopic eyes, whose diagnostic ability is inferiorto that of average RNFL thickness and RNFL thickness of several temporal and inferotemporal clock-hour sectors. The average RNFL thickness is recommended for discriminating PPG from highly myopic healthy eyes in current clinical practice in a Chinese population.

关键词： ganglion cell-inner plexiform layer diagnostic ability preperimetric glaucoma high myopia.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2018年第11期11卷 1842-1847页

作者： Hui xiao xiao-yu xu Yi-Min Zhong Xing Liu State Key Laboratory of Ophthalmology Zhongshan Ophthalmic Center Sun Yat-sun University

AIM： To investigate the variation in the central lamina cribrosa thickness（cLCT）, and the central anterior lamina cribrosa surface depth（cALCSD）, as well as the central prelaminar tissue thickness（cPLTT） related to age in healthy Chinese ***： A total of 96 eyes from 96 Chinese healthy subjects were recruited. According to age, the 96 cases were divided into three groups： the young group（YG, 18-39 y）, middle-age group（MG, 40-59 y） and older-age group（OG, 60 y and above）. Lamina cribrosa images were obtained from all participants using radial linear protocol by enhanced depth imaging spectral-domain optical coherence tomography. The cLCT, cALCSD and cPLTT were calculated from the average value of the lamina cribrosa thickness, anterior lamina cribrosa surface depth and prelaminar tissue thickness in the optic nerve head（ONH） centre point and paracentral points（150 μm from the centre point in the horizontal and vertical directions）. RESULTS： For the total subjects, the mean cLCT, c ALCSD and cPLTT were 235.18±41.27, 358.02±93.80 and 182.02±92.11 μm, respectively. No statistically significant differences in cLCT, cALCSD or cPLTT were found between gender and different eyes（P=0.27-0.92）. The cLCT of the OG was the thickest among the three groups, while the c PLTT of the YG was the thickest among the three groups（P〈0.05）. Age was positively correlated with cLCT（r=0.42, P〈0.001）, and negatively correlated with cPLTT（r=-0.24, P=0.02）. No significant correlation was found between the age and cALCSD（r=-0.06, P=0.55）. And no correlation has been found between axial length and cLCT, cALCSD and c PLTT（P=0.11-0.81）.CONCLUSION： The impact of age on the cLCT and the cPLLTT should be taken into account when analysing glaucoma and other diseases related to lamina cribrosa.

关键词： lamina cribrosa thickness normal subjects optical coherence tomography age

Hepatoprotective effects of Hovenia dulcis seeds against alcoholic liver injury and related mechanisms investigated via network pharmacology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2020年第24期26卷 3432-3446页

作者： xiao Meng Guo-Yi Tang Cai-Ning Zhao Qing Liu xiao-yu xu Shi-yu Cao Department of Nutrition School of Public HealthSun Yat-Sen UniversityGuangzhou 510080Guangdong ProvinceChina

BACKGROUND Alcoholic liver disease(ALD)is a worldwide health problem,and natural products have been shown to improve ALD due to their antioxidant *** parts of Hovenia dulcis(***),such as roots,peduncles,and stems,provide health ***,the effects and mechanisms of *** seeds on ALD have not yet been fully *** To determine *** antioxidant activity,evaluate its effects against ALD,and investigate the related mechanisms via network *** The antioxidant activity of *** seed was determined by both ferric-reducing antioxidant power and trolox equivalent antioxidant capacity *** total phenolic and flavonoid contents were determined by Folin–Ciocalteu method and aluminum chloride colorimetry,respectively,and polysaccharide was determined by phenol-sulfuric acid *** effects of *** seeds against alcoholic liver injury were investigated in mice with water extract pretreatment for 7 days followed by alcohol ***,the mechanisms of action were explored with network *** The results showed that *** seeds possessed strong antioxidant activity(245.11±10.17μmol Fe2+/g by ferric-reducing antioxidant power and 284.35±23.57μmol TE/g by trolox equivalent antioxidant capacity)and contained remarkable phenols and flavonoids,as well as a few *** seeds attenuated alcohol-induced oxidative liver injury,showing reduced serum alanine and aspartate aminotransferases,alkaline phosphatase,and triglyceride,elevated hepatic glutathione,increased activities of superoxide dismutase and catalase,and reduced malondialdehyde and hepatic *** results of network pharmacology analysis indicated that kaempferol,stigmasterol,and naringenin were the main bioactive compounds in *** seeds and that modulation of oxidative stress,inflammation,gut-derived products,and apoptosis were underlying mechanisms of the protective effects of *** seeds

关键词： Hovenia dulcis Alcoholic liver disease Antioxidant activity Hepatoprotection Oxidative stress Network pharmacology

Brain structure underlying the empathizing–systemizing difference in children with autism spectrum disorder

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

世界儿科杂志:英文版 2023年第8期19卷 782-792页

作者： Ning Pan Li-Zi Lin Xin Wang Lei Shi xiao-yu xu yu-Ying Jin Si Tan xiao-Jing Song Jin Jing Xiu-Hong Li Department of Maternal and Child Health School of Public HealthSun Yat-Sen UniversityNo.74 Zhongshan Road 2Yuexiu DistrictGuangzhou510080China Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment Department of Occupational and Environmental HealthSchool of Public HealthSun Yat-Sen UniversityGuangzhou510080China Key Laboratory of Brain Cognition and Education ScienceMinistry of EducationGuangzhouChina Institute for Brain Research and Rehabilitation and Guangdong Key Laboratory of Mental Health and Cognitive ScienceSouth China Normal UniversityGuangzhou510631China JNU-HKUST Joint Laboratory for Neuroscience and Innovative Drug Research College of PharmacyJinan UniversityGuangzhou510632China Chinese Institute for Brain Research Beijing102206China

Background Behavioral research has shown that children with autism spectrum disorder(ASD)have a higher empathizing–systemizing difference(D score)than normal ***,there is no research about the neuroanatomical mechanisms of the empathizing–systemizing difference in children with *** Participants comprised 41 children with ASD and 39 typically developing(TD)children aged 6‒12 ***–systemizing difference was estimated using the D score from the Chinese version of Children’s Empathy Quotient and Systemizing *** quantified brain morphometry,including global and regional brain volumes and surface-based cortical measures(cortical thickness,surface area,and gyrification)via structural magnetic resonance *** We found that the D score was significantly negatively associated with amygdala gray matter volume[β=−0.16;95%confidence interval(CI):−0.30,−0.02;P value=0.030]in children with *** was a significantly negative association between D score and gyrification in the left lateral occipital cortex(LOC)in children with ASD(B=−0.10;SE=0.03;cluster-wise P value=0.006)and a significantly positive association between D score and gyrification in the right fusiform in TD children(B=0.10;SE=0.03;cluster-wise P value=0.022).Moderation analyses demonstrated significant interactions between D score and diagnosed group in amygdala gray matter volume(β=0.19;95%CI 0.04,0.35;P value=0.013)and left LOC gyrification(β=0.11;95%CI 0.05,0.17;P value=0.001)but not in right fusiform gyrification(β=0.08;95%CI−0.02,0.17;P value=0.105).Conclusions Neuroanatomical variation in amygdala volume and gyrification of LOC could be potential biomarkers for the empathizing–systemizing difference in children with ASD but not in TD ***-scale neuroimaging studies are necessary to test the replicability of our findings.

关键词： Autism spectrum disorder Empathy Structural magnetic resonance imaging Systemizing

Rhodium-catalyzed aerobic N-alkylation of sulfonamides with alcohols

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第9期22卷 1021-1024页

作者： Sun Lin Feng Chuan Zhi Liu Qiang Li xiao Chun yu Qing xu College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China

By using the famous Wilkinson＇s catalyst, N-alkylation of sulfonamides can be easily realized under mild aerobic conditions by using alcohols as the alkylating reagent, giving monoalkylated sulfonamides in high yields and selectivities with water produced as the only byproduct. This advantageous aerobic method is potentially general in substrate scope that it can also be applied to other amides, amines and alcohols.

关键词： Alcohols Sulfonamides Rhodium catalyst N-Alkylation reaction Aerobic reaction

Clinical improvement in the therapy of aural keloids

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2009年第23期122卷 2865-2868页

作者： ZHANG Yan-ge CEN Ying LIU xiao-xue yu Rong xu xue-wen Department of Burns and Plastic Surgery West China HospitalSichuan University Chengdu Sichuan 610041 China

Background Keloids have a predilection for the aural region because of the special shape of the pinna. It is difficult to resect keloids entirely and maintain a satisfactory pinnal shape. Surgical excision in combination with radiotherapy is considered to be the most efficacious treatment available for severe keloids. This study was conducted to evaluate the treatment of aural keloids with intralesional excision and immediate postoperative adjuvant radiotherapy. Methods Forty-six patients with a combined total of 74 aural keloids were treated by intralesional excision and immediate postoperative adjuvant radiotherapy. All patients received a total dose of 20 Gy in 10 consecutive days. The time interval between keloid excision and delivery of the first radiotherapy fraction was 〈24 hours in all cases. The median follow-up was 2.2 years. Results Twenty-nine patients with 48 keloids （64.9%） were highly satisfied with their outcome, and were rated as good by the surgeon. Six patients with 12 keloids （16.2%） showed general satisfaction but wanted aesthetic refinement, and these patients were rated as fair by the surgeon. Three patients with four keloids （5.4%） showed no evidence of recurrence after surgery, but disliked the result because of the discoloration and irregularity of the scar surface. These patients were rated as poor by the surgeon. Partial recurrence occurred in 8 patients with 10 keloids （13.5%）. No major complications were observed. Conclusion Intralesional excision and immediate postoperative adjuvant radiotherapy is well tolerated and very effective in Dreventing recurrence of aural region keloids.

关键词： keloid surgery radiotherapy, adjuvant ear