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C_(60) as a metal-free catalyst for lithium-oxygen batteries

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Nano Research 2024年第5期17卷 3982-3987页

作者： Xinxin zhang Jiaming Tian Yu Wang shaohua Guo Yafei Li Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresFrontiers Science Center for Critical Earth Material CyclingNanjing UniversityNanjing 210023China

Carbon materials have shown significant potential as catalysts for lithium-oxygen batteries(LOBs).However,the intrinsic carbon sites are typically inert,necessitating extensive modifications and resulting in a limited density of active *** we present C_(60) as a metal-free cathode catalyst for LOBs,using density functional theory calculations and experimental *** lithiation reactions on the pristine carbon sites of C_(60) are energetically favorable due to its curvedπ-conjugation over the pentagon-hexagon *** kinetic analysis specifically reveals low energy barriers for Li_(2)O_(2) decomposition and Li diffusion on C_(60).Consequently,C_(60) exhibits significantly higher catalytic activity than typical carbon materials such as graphene and carbon *** electrochemical measurements validate the predictions,notably demonstrating that the intrinsic activity of C_(60) is comparable to that of noble metals.

关键词： lithium-oxygen batteries C_(60) density functional theory(DFT)calculations metal-free cathode

Study of seismic behavior of PHC piles with partial normal-strength deformed bars

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Earthquake Engineering and Engineering Vibration 2020年第2期19卷 307-320页

作者： zhang Xizhi zhang shaohua Xu Shengbo Niu Sixin Architectural Design&Research Institute of Tianjin University Tianjin 300072China Key Laboratory of Coast Civil Structure Safety Ministry of EducationTianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Shandong Tong Yuan Design Group Co. Ltd.Jinan 250101China

Nine PHC piles with partial normal-strength deformed bars were prepared in present study,and cyclic loading tests were implemented to evaluate these piles’seismic *** influence of the axial compression ratio and the amount of normal-strength deformed bars on failure modes,crack patterns,strength,stiffness,and ductility were *** test findings indicate that the change of axial compression ratio has a noticeable influence on the failure mode of PHC piles.A larger axial compression ratio results in a higher cracking bending resistance,ultimate bending resistance,and initial stiffness,but the propagation heights of flexural cracks decrease as the axial compression ratio ***,increasing the amount of normal-strength deformed bars causes a slight decrease in ***,a calculation formula was proposed to predict the flexural capacity of PHC piles with partial normal-strength deformed bars.

关键词： PHC pile prestressed tendons deformed bars seismic behavior cyclic loading test flexural capacity

Defect- and dopant-controlled carbon nanotubes fabricated by self-assembly of graphene nanoribbons

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Nano Research 2015年第9期8卷 2988-2997页

作者： Cun zhang and shaohua Chen LNM Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China

Molecular dynamics simulations showed that a basal carbon nanotube can activate and guide the fabrication of single-walled carbon nanotubes （CNTs） on its internal surface by self-assembly of edge-unpassivated graphene nanoribbons with defects. Furthermore, the distribution of defects on self-assembled CNTs is controllable. The system temperature and defect fraction are two main factors that influence the success of self-assembly. Due to possible joint flaws formed at the boundaries under a relatively high constant temperature, a technique based on increasing the temperature is adopted. Self-assembly is always successful for graphene nanoribbons with relatively small defect fractions, while it will fail in cases with relatively large ones. Similar to the self-assembly of graphene nanoribbons with defects, graphene nanoribbons with different types of dopants can also be self-assembled into carbon nanotubes. The finding provides a possible fabrication technique not only for carbon nanotubes with metallic or semi-con- ductive properties but also for carbon nanotubes with electromagnetic induction characteristics.

关键词： graphene nanoribbon,carbon nanotube,defect,dopant,self-assembly molecular dynamics

Efficacy and clinical outcome of chemotherapy and endocrine therapy as first-line treatment in patients with hormone receptor-positive HER2-negative metastatic breast cancer

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Chinese Medical Journal 2023年第12期136卷 1459-1467页

作者： Yang Yuan shaohua zhang Tao Wang Li Bian Min Yan Yongmei Yin Yuhua Song Yi Wen Jianbin Li Zefei Jiang Department of Oncology No.4 Ward The Fifth Medical Center of Chinese People’s Liberation Army(PLA)General HospitalBeijing 100071China Department of Oncology No.3 Ward The Fifth Medical Center of Chinese People’s Liberation Army(PLA)General HospitalBeijing 100071China Department of Breast Disease Henan Breast Cancer CenterThe Affiliated Cancer Hospital of Zhengzhou University&Henan Cancer HospitalZhengzhouHenan 450008 China Department of Breast Cancer Jiangsu Province Hospital&The First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu 210029 China Department of Breast Cancer Center The Affiliated Hospital of Qingdao UniversityQingdaoShandong 260000 China Medical Department Medpion(Beijing)Medical Technology Co.LtdBeijing 100062 China

Background:Endocrine therapy(ET)and ET-based regimens are the preferred first-line treatment options for hormone receptor(HR)-positive and human epidermal growth factor receptor 2(HER2)-negative metastatic breast cancer(HR+/HER2-MBC),while chemotherapy(CT)is commonly used in clinical *** aim of this study was to investigate the efficacy and clinical outcome of ET and CT as first-line treatment in Chinese patients with HR+/***:Patients diagnosed with HR+/HER2-MBC between January 1st,1996 and September 30th,2018 were screened from the Chinese Society of Clinical Oncology Breast Cancer *** initial and maintenance first-line treatment,progression-free survival(PFS),and overall survival(OS)were ***:Among the 1877 included patients,1215(64.7%)received CT and 662(35.3%)received ET as initial first-line *** were no statistically significant differences in PFS and OS between patients receiving ET and CT as initial first-line treatment in the total population(PFS:12.0 vs.11.0 months,P=0.22;OS:54.0 vs.49.0 months,P=0.09)and propensity score matched *** patients without disease progression after at least 3 months of initial therapy,maintenance ET following initial CT(CT-ET cohort,n=449)and continuous schedule of ET(ET cohort,n=527)had longer PFS than continuous schedule of CT(CT cohort,n=406)in the total population(CT-ET cohort *** cohort:17.0 vs.8.5 months;P<0.01;ET cohort *** cohort:14.0 vs.8.5 months;P<0.01)and propensity score matched *** in the three cohorts yielded the same results as ***:ET was associated with similar clinical outcome to CT as initial first-line *** patients without disease progression after initial CT,switching to maintenance ET showed superiority in clinical outcome over continuous schedule of CT.

关键词： Breast neoplasms Metastatic breast cancer Hormone receptor-positive HER2-negative Chemotherapy Endocrine therapy First-line treatment Maintenance therapy

Single‑cell sequencing reveals the reproductive variations between primiparous and multiparous Hu ewes

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Journal of Animal Science and Biotechnology 2024年第2期15卷 614-631页

作者： Ting Ge Yifan Wen Bo Li Xiaoyu Huang shaohua Jiang Enping zhang Key Laboratory of Animal Genetics Breeding and Reproduction of Shaanxi ProvinceCollege of Animal Science and TechnologyNorthwest A&F UniversityYangling 712100China

Background In the modern sheep production systems,the reproductive performance of ewes determines the economic profitability of *** the genetic mechanisms underlying differences in the litter size is important for the selection and breeding of highly prolific *** sheep,a high-quality Chinese sheep breed,is known for its high fecundity and is often used as a model to study prolificacy *** the current study,animals were divided into two groups according to their delivery rates in three consecutive lambing seasons(namely,the high and low reproductive groups with≥3 lambs and one lamb per season,n=3,respectively).The ewes were slaughtered within 12 h of estrus,and unilateral ovarian tissues were collected and analyzed by 10×Genomics single-cell RNA *** A total of 5 types of somatic cells were identified and corresponding expression profiles were mapped in the ovaries of each ***,the differences in the ovary somatic cell expression profiles between the high and low reproductive groups were mainly clustered in the granulosa ***,four granulosa cell subtypes were *** analysis revealed that the abundance of JPH1 expression and the reduction of LOC101112291 expression could lead to different evolutionary directions of the granulosa ***,the expression levels of FTH1 and FTL in mural granulosa cells of the highly reproductive group were significantly *** genes inhibit necroptosis and ferroptosis of mural granulosa cells,which helps prevent follicular *** This study provides insights into the molecular mechanisms underlying the high fecundity of Hu *** differences in gene expression profiles,particularly in the granulosa cells,suggest that these cells play a critical role in female *** findings also highlight the importance of genes such as JPH1,LOC101112291,FTH1,and FTL in regulating granulosa cell function and follicular development.

关键词： Granulosa cells Hu sheep Lambing number Ovarian somatic cells Single-cell RNA sequencing

两种机器学习模型对急性冠脉综合征患者发生院内心搏骤停的预测价值比较

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实用心脑肺血管病杂志 2024年第3期32卷 39-42,48页

作者：杨贵分张少华刘卫珍陈敏霞姚兰廖旭中部战区总医院心血管内科湖北省武汉市430070

目的比较两种机器学习模型[决策树早期预警得分(DTEWS)模型、决策树模型]对急性冠状动脉综合征(ACS)患者发生院内心搏骤停(IHCA)的预测价值。方法采用便利抽样法回顾性选取2018—2022年入住某三甲医院心血管内科的发生IHCA的ACS患者5... 详细信息

目的比较两种机器学习模型[决策树早期预警得分(DTEWS)模型、决策树模型]对急性冠状动脉综合征(ACS)患者发生院内心搏骤停(IHCA)的预测价值。方法采用便利抽样法回顾性选取2018—2022年入住某三甲医院心血管内科的发生IHCA的ACS患者53例为IHCA组,选取同期入住某三甲医院心血管内科的未发生IHCA的ACS患者706例为非IHCA组。基于两种机器学习模型中的预测因子,收集患者一般资料,采用ROC曲线评估两种机器学习模型对ACS患者发生IHCA的预测价值。结果两组年龄、糖尿病发生率、致命性心律失常发生率、吸氧者占比、入院方式和入院时Killip分级、收缩压、舒张压、血尿素氮、心肌肌钙蛋白T、意识状态及住院时间比较,差异有统计学意义(P0.05)。结论 DTEWS模型、决策树模型均对ACS患者发生IHCA有中等预测价值,其中DTEWS模型纳入变量较少、易获取且计算方式简单,更适宜临床推广。

关键词：急性冠脉综合征猝死心脏院内心搏骤停机器学习预测

Braille Character Segmentation Algorithm Based on Gaussian Diffusion

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Computers, Materials & Continua 2024年第4期79卷 1481-1496页

作者： Zezheng Meng Zefeng Cai Jie Feng Hanjie Ma Haixiang zhang shaohua Li School of Computer Science and Technology Zhejiang Sci-Tech UniversityHangzhou310018China

Optical braille recognition methods typically employ existing target detection models or segmentation modelsfor the direct detection and recognition of braille characters in original braille images. However, these methodsneed improvement in accuracy and generalizability, especially in densely dotted braille image environments. Thispaper presents a two-stage braille recognition framework. The first stage is a braille dot detection algorithmbased on Gaussian diffusion, targeting Gaussian heatmaps generated by the convex dots in braille images. Thisis applied to the detection of convex dots in double-sided braille, achieving high accuracy in determining thecentral coordinates of the braille convex dots. The second stage involves constructing a braille grid using traditionalpost-processing algorithms to recognize braille character information. Experimental results demonstrate that thisframework exhibits strong robustness and effectiveness in detecting braille dots and recognizing braille charactersin complex double-sided braille image datasets. The framework achieved an F1 score of 99.89% for Braille dotdetection and 99.78% for Braille character recognition. Compared to the highest accuracy in existing methods,these represent improvements of 0.08% and 0.02%, respectively.

关键词： Computer vision image recognition optical braille recognition

Strong Goldbach Conjecture and Generalized Moser-Type Inequalities

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Wuhan University Journal of Natural Sciences 2021年第1期26卷 15-18页

作者： zhang shaohua School of Mathematics and Statistics Yangtze Normal UniversityChongqing 408102China

In this paper,we consider the generalized Moser-type inequalities,sayφ(n)≥kπ(n),where k is an integer greater than 1,φ(n)is Euler function andπ(n)is the prime counting *** computer,Pierre Dusart’s inequality onπ(n)and Rosser-Schoenfeld’s inequality involvingφ(n),we give all solutions ofφ(n)=2π(n)andφ(n)=3π(n),***,we obtain the best lower bound that Moser-type inequalitiesφ(n)>kπ(n)hold for k=2,*** consequences,we show that every even integer greater than 210 is the sum of two coprime composite,every odd integer greater than 175 is the sum of three pairwise coprime odd composite numbers,and every odd integer greater than 53 can be represented as p+x+y,where p is prime,x and y are composite numbers satisfying that p,and x and y are pairwise ***,we give a new equivalent form of Strong Goldbach Conjecture.

关键词： Strong Goldbach Conjecture pairwise coprime Euler totient function prime-counting function

Orientation Dependence of Stress Rupture Properties of a Ni-based Single Crystal Superalloy at 760℃

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Journal of Materials Science & Technology 2012年第3期28卷 229-233页

作者： shaohua zhang Dong Wang Jian zhang Langhong Lou Superalloys Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academyof Sciences72 Wenhua RoadShenyang 110016China

The orientation dependence of creep rupture lives of a single crystal superalloy at 760℃/760 MPa was *** orientations of the specimens tested were about 30°away from [001].The results showed that specimens with orientations on the [001]-[011] boundary had the longest rupture *** deformation of these specimen were controlled by a/2〈110〉 slip and a few stacking faults with two orientations were *** the other hand,specimens with orientations near the [001]-[011] boundary or on the [001]-[111] boundary showed short rupture lives,and stacking faults with single orientation were observed in these *** rupture properties and the deformation mechanisms were discussed based on the dislocation pattern and the calculated Schmid factors for different specimens.

关键词： Single crystal superalloy Stress rupture Orientation