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A Dielectric Ink Combining Acrylate and Cyanate Moieties for Inkjet 3D Printing with Good Thermal Stability

Chinese Journal of Polymer Science 2024年第6期42卷 766-774页

作者： Yi-Xuan Li Liang-ying Wu Yan Yang Yao-zhong Lu zhong-ying Ji Yu-Xiong Guo Xiao-Long Wang Qiao-Sheng Pu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou730000China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsLanzhou730000China Lanzhou Traditional Chinese Medicine Hospital of Orthopedics and Traumatology Lanzhou730000China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai Zhongke Research Institute of Advanced Materials and Green Chemical EngineeringYantai264006China

Inkjet 3D printing has potential in the additive manufacturing of electronic circuits and ***,inks that can be used for printing layers with T5%>300℃ or hardness>200 MPa have been rarely *** ester(CE)polymers have excellent thermal stability,high strength,and low shrinkage compared to other common dielectric inks for inkjet 3D printing,but cannot be quickly shaped by ultraviolet(UV)irradiation or thermal *** CEs with UV-curable monomers may be a possible way to accelerate crosslinking,but there are challenges from the adverse effects of the dilution of both *** this study,dielectric inks with acrylate and cyanate moieties were *** low viscosity and surface tension of the CE precursor(Bisphenol E cyanate ester)were combined with photocurable acrylate diluent monomers and cross-linker to realize an ink suitable for inkjet 3D *** internal dual three-dimensional cross-linked network structure resin was prepared by a combination of photocuring and thermal curing with T5%up to 326.69℃,hardness up to 431.84 MPa,dielectric constant of 2.70 at 8 GHz,and shrinkage of 1.64%.The developed dielectric inks can be applied to the 3D printing of printed circuit boards and other electronic devices that require dielectric properties.

关键词： Inkjet printing Cyanate ester resin 3D doubly cross-linked network Good thermal stability

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Immediate Effect of Electro-acupuncture on Endometrial Blood Flow in Patients with Recurrent Implantation Failure:A Randomized Controlled Trial

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Chinese Journal of Integrative Medicine 2024年第4期30卷 291-298页

作者： LAI Yuan-yuan LIU Li-ying WU Yong-na HUANG Lei ZHENG Xiao-yan GAN Di YU Si-yi zhong ying LIANG Fan-rong ZHOU ying YANG Jie Acupuncture and Tuina School Chengdu University of Traditional Chinese MedicineChengdu(610032)China Sichuan Jinxin Xi'nan Women's and Children's Hospital Chengdu(610032)China Yuan TCM Wellness Pte.Ltd.(999002) Pulse TCM SingaporeSingapore

Objective To investigate the immediate effects of electro-acupuncture(EA)on endometrial blood flow among recurrent implantation failure(RIF)*** Eighty RIF patients,enrolled from March 2022 to December 2022,were randomly allocated into either the EA group(40 cases)or the waiting-list(WL)group(40 cases)by using a random number *** EA group underwent acupuncture at points of Shenting(GV 24),Baihui(GV 4),Benshen(GB 13),bilateral Zigong(EX-CA 1),Huangshu(KI 16),Sanyinjiao(SP 6)and Xuehai(SP10),and electric acupuncture apparatus was connected to EX-CA 1,KI 16,SP 6,and SP 10 with disperse-dense waves at 4/20 Hz frequencies for 30 min after transvaginal ultrasound,while the WL group received no *** primary outcome measured was the endometrial volume blood *** secondary outcomes included the bilateral uterine artery index,endometrial volume,endometrial blood flow type,vascular distribution index(VI^(MV))for endometrial and ovary,clinical pregnancy rate,and embryo implantation *** In the EA group,there was a notable decrease in the bilateral pulsatility index and a significant improvement in the endometrial blood flow type post-EA(P0.05).Besides,no adverse events related to EA were *** EA can promptly ameliorate VI^(MV) for the endometrial and right ovary,and endometrial blood flow *** randomized controlled trials are warranted to investigate the long-term effects of EA on blood flow of RIF patients and its implications for pregnancy outcomes.(Trial registration ***2200057377

关键词： electro-acupuncture recurrent implantation failure transvaginal ultrasound endometrial receptivityanalysis randomized controlledtrial

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Endoscopic submucosal dissection vs transanal endoscopic surgery for rectal tumors: A systematic review and meta-analysis

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World Journal of Clinical Cases 2024年第1期12卷 95-106页

作者： Long-Wu Huang ying zhong Department of Gastroenterology Huzhou Third Municipal Hospitalthe Affiliated Hospital of Huzhou UniversityHuzhou 313000Zhejiang ProvinceChina

BACKGROUND Endoscopic submucosal dissection(ESD)and transanal endoscopic submucosal dissection(TES)are widely employed surgical ***,the comparative efficacy and safety of both remain *** To comprehensively analyze and discern differences in surgical outcomes between ESD and *** We conducted a systematic search of the electronic databases PubMed,Embase,Cochrane Central Register of Controlled Trials,Scopus,and CINAHL from inception till August *** analyzed outcomes including recurrence rate,en bloc resection,R0 resection rate,perforation rate,procedure length,and hospital stay length applying a random-effects inverse-variance *** assessed publication bias by conducting an Egger’s regression test and sensitivity *** We pooled data from 11 studies involving 1013 *** found similar recurrence rates,with a pooled odds ratio of 0.545(95%CI:0.176-1.687).En bloc resection,R0 resection,and perforation rate values were also similar for both ESD and *** pooled analysis for procedure length indicated a mean difference of-4.19 min(95%CI:-22.73 to 14.35),and the hospital stay was on average shorter for ESDs by about 0.789 days(95%CI:-1.671 to 0.093).CONCLUSION Both ESD and TES displayed similar efficacy and safety profiles across multiple *** findings show that individualized patient and surgeon preferences,alongside specific clinical contexts,can be considered when selecting between these two techniques.

关键词： Endoscopic submucosal dissection Transanal endoscopic submucosal dissection Meta-analysis Surgical outcomes Rectal tumours

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Developing and validating a predictive model of delivering large-forgestational-age infants among women with gestational diabetes mellitus

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World Journal of Diabetes 2024年第6期15卷 1242-1253页

作者： Yi-Tian Zhu Lan-Lan Xiang Ya-Jun Chen Tian-ying zhong Jun-Jun Wang Yu Zeng Department of Clinical Laboratory Jinling Clinical Medical College of Nanjing Medical UniversityNanjing 210002Jiangsu ProvinceChina Department of Clinical Laboratory Women’s Hospital of Nanjing Medical UniversityNanjing Women and Children’s Healthcare HospitalNanjing 210003Jiangsu ProvinceChina

BACKGROUND The birth of large-for-gestational-age(LGA)infants is associated with many shortterm adverse pregnancy *** has been observed that the proportion of LGA infants born to pregnant women with gestational diabetes mellitus(GDM)is significantly higher than that born to healthy pregnant ***,traditional methods for the diagnosis of LGA have ***,this study aims to establish a predictive model that can effectively identify women with GDM who are at risk of delivering LGA *** To develop and validate a nomogram prediction model of delivering LGA infants among pregnant women with GDM,and provide strategies for the effective prevention and timely intervention of *** The multivariable prediction model was developed by carrying out the following ***,the variables that were associated with LGA risk in pregnant women with GDM were screened by univariate analyses,for which the P value was<***,Least Absolute Shrinkage and Selection Operator regression was fit using ten cross-validations,and the optimal combination factors were se-lected by choosing lambda 1se as the *** final predictors were deter-mined by multiple backward stepwise logistic regression analysis,in which only the independent variables were associated with LGA risk,with a P value<***,a risk prediction model was established and subsequently evaluated by using area under the receiver operating characteristic curve,calibration curve and decision curve *** After using a multistep screening method,we establish a predictive *** risk factors for delivering an LGA infant were identified(P<0.01),including weight gain during pregnancy,parity,triglyceride-glucose index,free tetraiodothyronine level,abdominal circumference,alanine transaminase-aspartate aminotransferase ratio and weight at 24 gestational *** nomogram’s prediction ability was supported by the area under the curve(0.703,0.709,and 0.699 f

关键词： Large-for-gestational-age Gestational diabetes mellitus Predictive model Nomogram Triglyceride-glucose index

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Experimental and simulation study on shear stress-induced erythrocyte damage based on vortex oscillator

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Biomedical Engineering Communications 2024年第1期3卷 23-30页

作者： Xu Mei Li-Pu Zhao Lian Hou ying-ying zhong State Key Laboratory of Digital Medical Engineering School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China School of Mechanical and Electrical Engineering Silicon Lake Vocational and Technical CollegeSuzhou 215006China College of Education Central China Normal UniversityWuhan 430079China

Background:Shear stress-induced erythrocyte damage,namely hemolysis,is an important problem in the development of blood-contacting medical devices such as mechanical circulatory support *** fluid dynamics simulation combined with hemolysis prediction models have been widely used to predict *** the development of hemolysis prediction models,the new hemolysis prediction model requires more experimental data to *** addition,the difference of in vitro blood-shearing device also affect the accuracy of hemolysis ***:To address these problems,a new in vitro blood-shearing device(vortex oscillator)was used to further verify the accuracy of the hemolysis prediction models,and to guide the optimal design of blood-contacting medical devices such as mechanical circulatory support ***,the flow field information such as wall stress and velocity of the vortex oscillator under different speeds was ***,different hemolysis prediction models were used to calculate hemolysis,and the predicted data was compared with the experimental *** and Conclusion:In this study,the flow field information inside the vortex oscillator at high rotational speeds was systematically investigated,and the prediction of hemolysis was carried *** results showed that the predicted data of hemolysis was significantly different from the experimental data,which indicated that it was urgent to establish a standardized in vitro blood-shearing platform to provide a reference for accurate hemolysis prediction.

关键词： CFD Hemolysis prediction model Vortex oscillator Shear stress

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植物多样性在旅游目的地竞争力中的地位与作用评估

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分子植物育种 2024年第11期22卷 3748-3753页

作者：钟莹北海职业学院北海536000

本研究深入探讨了植物多样性在旅游目的地竞争力中的地位,并分析了植物多样性对旅游业的直接和间接作用。以杭州西湖风景区和海南岛国际旅游岛为案例,研究发现植物多样性为旅游目的地创造了独特的自然景观,成为吸引旅游者的重要因素。... 详细信息

本研究深入探讨了植物多样性在旅游目的地竞争力中的地位,并分析了植物多样性对旅游业的直接和间接作用。以杭州西湖风景区和海南岛国际旅游岛为案例,研究发现植物多样性为旅游目的地创造了独特的自然景观,成为吸引旅游者的重要因素。通过对比分析植物多样性丰富和缺乏的情况下的竞争力差异,揭示了植物多样性对旅游业的关键作用。为实现旅游目的地竞争力的提升,本研究提出了包括保护濒危植物与生态系统、推动生态教育与导览活动、促进绿色旅游在内的可持续发展策略。通过这些系统性的研究分析,我们期望为旅游目的地的可持续发展提供实质性的参考。

关键词：植物多样性旅游目的地竞争力可持续发展绿色旅游

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城市多中心结构提升了居民幸福感吗?

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华中科技大学学报（社会科学版） 2024年第5期38卷 29-40页

作者：张可钟莹东华大学旭日工商管理学院华东政法大学商学院

城市是承载美好生活的空间载体,城市空间发展模式对居民福祉的影响不可忽视。本文基于2010—2018年中国家庭追踪调查(CFPS)的微观数据,采用多层混合效应模型考察了城市多中心结构对城市居民幸福感的影响。研究发现,城市多中心结构显著... 详细信息

城市是承载美好生活的空间载体,城市空间发展模式对居民福祉的影响不可忽视。本文基于2010—2018年中国家庭追踪调查(CFPS)的微观数据,采用多层混合效应模型考察了城市多中心结构对城市居民幸福感的影响。研究发现,城市多中心结构显著提升了居民幸福感,这一结论经系列稳健性检验和解决内生性问题后依然成立。异质性分析发现,多中心空间结构对大城市、高购房压力城市以及城市户籍、高收入阶层居民幸福感的促进作用更大。机制检验表明,城市多中心结构通过就业和收入效应、公共服务和消费效应、居住环境效应三种潜在机制影响居民幸福感。本文为优化城市空间结构和增进民生福祉的双协同提供了经验证据。

关键词：城市空间结构居民幸福感影响机制

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数字经济下企业品牌形象塑造的个案研究

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经济纵横 2024年第2期 91-97页

作者：宗臻钟颖华南师范大学国际商学院广东佛山528225

在数字经济浪潮中,企业品牌形象的塑造与推广呈现新的阶段性特征。文章基于SIVA理论分析框架,通过对小米公司2010—2022年的纵向案例分析,发现在企业不同发展阶段,数字营销从掌握客户需求、信息获取、价值共享和购买渠道四个方面对企业... 详细信息

在数字经济浪潮中,企业品牌形象的塑造与推广呈现新的阶段性特征。文章基于SIVA理论分析框架,通过对小米公司2010—2022年的纵向案例分析,发现在企业不同发展阶段,数字营销从掌握客户需求、信息获取、价值共享和购买渠道四个方面对企业品牌形象产生影响。为了引导企业在不同发展阶段充分发挥数字化手段的作用,应针对市场进入阶段、市场扩大阶段、市场稳固阶段等不同阶段,制定相应的数字经济规范与标准。针对数字平台上的虚假信息,建立完善的数字化监管体系,并与行业协会合作研究制定行业自律规范,保障公共利益和市场秩序。加大数字技术研发和创新的支持力度,创建更先进的数字化平台。针对数字经济时代信息碎片化和消费者注意力分散的特征,积极推动搭建一流品牌和世界级品牌的企业专属平台。

关键词：数字经济企业品牌形象个案研究 SIVA理论

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论青少年合理怀疑精神的培育——基于近现代哲学家关于怀疑论述的分析

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清华大学教育研究 2024年第4期45卷 150-157页

作者：耿博雅石中英北京林业大学马克思主义学院清华大学教育研究院

青少年怀疑精神的培育是全民科学素质建设的关键环节。本文批判性分析和借鉴笛卡尔、休谟、康德、皮尔士、胡塞尔、杜威、罗素和维特根斯坦等近现代哲学家关于怀疑的重要哲学论述，提出怀疑是一种人们以分析新旧认知之间的冲突为起点，... 详细信息

青少年怀疑精神的培育是全民科学素质建设的关键环节。本文批判性分析和借鉴笛卡尔、休谟、康德、皮尔士、胡塞尔、杜威、罗素和维特根斯坦等近现代哲学家关于怀疑的重要哲学论述，提出怀疑是一种人们以分析新旧认知之间的冲突为起点，并以真理为目标的追问行动；进而规范和论证该怀疑作为青少年怀疑精神培育内核的合理性，提出合理怀疑具有可感知性、意义性和科学性等特征。当代培育青少年合理怀疑精神应该重视以下几点：将培育合理怀疑精神纳入青少年学生发展核心素养以及根据各学龄段设定相应教学内容与教学目标；在教学过程中，通过组织理性对话和讨论等形式培育学生提出和解决合理怀疑的能力；教学评价上，允许学生突破标准答案的限制，鼓励提出有根据的批判性、突破性和创造性观点；发挥教师在培养合理怀疑精神方面的榜样示范作用，加强教师合理怀疑精神的培训工作。

关键词：怀疑合理怀疑感知怀疑在先认知创新科学素质建设

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多机器人系统PTCWA指标与布局优化

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机械设计与制造 2024年第6期400卷 357-361,366页

作者：李龙季波田应仲上海市智能制造及机器人重点实验室上海200072 上海大学机电工程与自动化学院上海200072 上海大学人工智能研究院上海200072 同济大学上海智能科学与技术研究院上海200072

机器人协作系统是提高机械制造加工自动化与灵活性的有效方式,提出了一种基于协作工作空间与公共工作空间乘积(PTCWA)性能指标的机器人系统布局优化模型与方法。该方法采用解析法对多机械臂系统的公共工作空间和协同工作空间进行分析,... 详细信息

机器人协作系统是提高机械制造加工自动化与灵活性的有效方式,提出了一种基于协作工作空间与公共工作空间乘积(PTCWA)性能指标的机器人系统布局优化模型与方法。该方法采用解析法对多机械臂系统的公共工作空间和协同工作空间进行分析,研究系统布局与两种操作空间之间的耦合关系。基于机械臂D-H参数与机器人数量,对系统布局的极限位置进行分析。基于PTCWA性能指标与布局极限位置参数构建多臂系统布局优化模型,以系统性能指标最优为目标对优化模型进行优化求解。最后以由三个工业机器人组成的典型协作系统为实例进行仿真验证,结果表明以该优化模型进行优化求解可以得到机器人系统的最优系统布局参数。

关键词：多机器人系统布局优化 PTCWA 协作空间

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