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Simultaneous achievement of large electrocaloric effect and ultrawide operating temperature range in BaTiO_(3)-based lead-free ceramic

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Journal of Advanced Ceramics 2024年第8期13卷 1234-1241页

作者： Zhaojie Wang Yingzhi Meng Silin Tang xiang niu Hongfang Zhang Dingyuan Wang Yisong Bai Bialin Peng Xue Chen Qingqing Ke Sheng-Guo Lu Laijun Liu Guangxi Key Lab of Optical and Electronic Functional Materials and Devices Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of ResourcesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China School of Microelectronics Science and Technology Sun Yat-sen UniversityZhuhai 519082China Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China School of Physical Science and Technology&Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China Qingdao Haier Smart Technology R&D Co. Ltd.Qingdao 266100China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710071China Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing Technology Guilin University of Electronic TechnologyGuilin 541004China

The electrocaloric effect(ECE),known for its environmentally friendly characteristics,holds significant promise for advancing next-generation solid-state refrigeration *** a large ECE along with a wide working temperature range near room temperature remains a key developmental *** this study,we successfully obtained a substantial ECE of 1.78 K and an extensive working temperature range of 103 K(AT>1.52 K)near room temperature in CaZrO_(3)-modified BaTiO_(3) lead-free ferroelectric ***,this achievement was verified using direct *** piezoresponse force microscopy(PFM)results suggest that the broad temperature range is attributed to the formation of ferroelectric microdomains and polar nanoregions(PNRs).Furthermore,X-ray photoelectron spectroscopy(XPS)and ultraviolet-visible(UV-Vis)spectroscopy reveal a decrease in the oxygen vacancy concentration and an increase in the bandgap for higher CaZrO_(3) doping *** changes synergistically enhance the maximum applied electric field,helping to achieve a high-performance EcE near room *** research presents a straightforward and effective approach for achieving high-performance ECEs in BaTiOg lead-free ceramics,offering promising prospects for application in next-generation solid-state refrigeration technologies.

关键词： BaTiO_(3) electrocaloric effect oxygen vacancy band-gap

miR-200b-3p accelerates progression of pituitary adenomas by negatively regulating expression of RECK

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Oncology Research 2024年第5期32卷 933-941页

作者： XIAOXI WANG YANFEI JIA QIANG LI QIANG YANG YINGFENG LIU BEIFENG WEI xiang niu YINJIE ZHANG XIAODONG LUO ZIYU ZHAO PENG WANG Department of Neurosurgery Tianshui First People’s HospitalTianshuiChina Department of Neurosurgery The Second Affiliated Hospital of Lanzhou UniversityLanzhouChina

MicroRNA(miR)-200b-3p has been associated with many tumors,but its involvement in pituitary adenoma is *** study investigated the molecular mechanism underlying miR-200b-3p regulation in pituitary adenomas to provide a theoretical basis for *** was used to analyze pituitary adenoma-related genes and screen new targets related to RECK and *** well,the relationship between miR-200b-3p and RECK protein was verified using a double-luciferase reporter gene *** expression of miR-200b-3p in clinical samples was analyzed by in situ *** of the miR-200b-3p inhibitor and small interfering-RECK(si-RECK)was verified by ***3 cell viability and proliferation were detected using CCK8 and EdU *** was detected by flow cytometry and western *** healing and Transwell assays were used to detect cell migration and *** effects of miR-200b-3p and RECK on GH3 cells were verified using salvage ***-200b-3p was highly expressed in pituitary tumor *** of miR-200b-3p inhibited cell proliferation promoted cell apoptosis,inhibited invasion and migration,and inhibited the expression of matrix ***,miR-200b-3p negatively regulated *** expression of RECK in pituitary adenoma tissues was lower than that in neighboring ***-RECK rescued the function of miR-200b-3p inhibitors in the above cellular behaviors,and miR-200b-3p accelerated the development of pituitary adenoma by negatively regulating RECK *** summary,this study investigated the molecular mechanism by which miR-200b-3p regulates the progression of pituitary adenoma through the negative regulation of *** findings provide a new target for the treatment of pituitary adenoma.

关键词： Pituitary adenomas miR-200b-3p RECK Matrix metalloproteinase

Systemic inflammatory response index is a predictor of prognosis in gastric cancer patients: Retrospective cohort and meta-analysis

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World Journal of Gastrointestinal Surgery 2024年第2期16卷 382-395页

作者： Jing-Yao Ren Meng Xu xiang-Dong niu Shi-Xun Ma Ya-Jun Jiao Da Wang Miao Yu Hui Cai School of Clinical Medicine Ningxia Medical UniversityYinchuan 750000Ningxia Hui autonomous regionChina Gansu Provincial Hospital Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina General Surgery Clinical Medical Center Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina Medical College of Jiangsu University Jiangsu UniversityZhenjiang 212013Jiangsu ProvinceChina Key Laboratory of Molecular Diagnostics and Precision Medicine for Surgical Oncology in Gansu Province Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina

BACKGROUND The systemic inflammatory response index(SIRI)has been demonstrated to make a significant difference in assessing the prognosis of patients with different solid ***,research is needed to ascertain the accuracy and reliability of applying the SIRI to patients who undergo robotic radical gastric cancer *** To validate the applicability of the SIRI in assessing the survival of gastric cancer patients and evaluate the clinical contribution of preoperative SIRI levels to predicting long-term tumor outcomes in patients,who received robotic radical gastric cancer *** Initially,an exhaustive retrieval was performed in the PubMed,the Cochrane Library,EMBASE,Web of Science,and Scopus databases to identify relevant ***,a meta-analysis was executed on 6 cohort studies iden-tifying the value of the SIRI in assessing the survival of gastric cancer ***,the clinical data of 161 patients undergoing robotic radical gastric cancer surgery were retrospectively analyzed to evaluate their clinicopathological characteristics and relevant laboratory *** association between preoperative SIRI levels and 5-year overall survival(OS)and disease-free survival(DFS)was *** The findings demonstrated an extensive connection between SIRI values and the outcome of patients with gastric *** SIRI levels were identified as an independent hazard feature for both OS and DFS among those who received robotic surgery for gastric *** levels in gastric cancer patients were observed to be associated with the presence of comorbidities,T-stage,carcinoembryonic antigen levels,the development of early serious postoperative complications,and the rate of lymph node *** SIRI values are correlated with adverse in the gastric cancer population and have the potential to be utilized in predicting long-term oncological survival in patients who undergo robotic radical gastric canc

关键词： Systemic inflammatory response index Prognosis Gastric cancer Complications Meta-analysis

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语言接触视角下的西北回族汉语方言语音分析

边疆经济与文化 2024年第2期 126-131页

作者：牛香兰青海民族大学文学与新闻传播学院西宁810007

从语言接触的视角来研究西北回族汉语方言,与西北方言的整体特点进行比较,结合西北汉语方言规律,系统、深入地分析其汉语方言的演变规律,力图展现演变的原因。其中,通过有目的的方言点调查,取得能够体现西北回族汉语方言的典型语料,是... 详细信息

从语言接触的视角来研究西北回族汉语方言,与西北方言的整体特点进行比较,结合西北汉语方言规律,系统、深入地分析其汉语方言的演变规律,力图展现演变的原因。其中,通过有目的的方言点调查,取得能够体现西北回族汉语方言的典型语料,是一个重要的前提条件。西北回族汉语方言的形成以中原官话、兰银官话两大官话为背景,加之西北特有的多语系共存的语言生态,还要结合历史上西北地区经过的人口大迁徙,将关中方言作为主流方言而带动的方言接触,使得西北地区的回族汉语方言同中存异。

关键词：语言接触西北回族汉语方言声母韵母声调

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可溶解热塑性聚酰亚胺薄膜的制备和性能研究

绝缘材料 2024年第10期57卷 26-33页

作者：贺娟牛翔陈文求范和平江汉大学湖北省化学研究院湖北武汉430056 华烁科技股份有限公司湖北武汉430074 华烁电子材料(武汉)有限公司湖北鄂州436070

为了改善传统热塑性聚酰亚胺(TPI)的溶液加工性并提高其耐热性和粘接性,采用不同的商品化二酐单体分别与自制的主链含有吡啶和二苯醚结构及活性苯酚侧基或苯侧基的二胺单体通过两步法制备了一系列可溶解热塑性聚酰亚胺(TPI)树脂,随后制... 详细信息

为了改善传统热塑性聚酰亚胺(TPI)的溶液加工性并提高其耐热性和粘接性,采用不同的商品化二酐单体分别与自制的主链含有吡啶和二苯醚结构及活性苯酚侧基或苯侧基的二胺单体通过两步法制备了一系列可溶解热塑性聚酰亚胺(TPI)树脂,随后制备了相应的TPI薄膜以及挠性覆铜板(FCCL)。通过溶解性试验和凝胶渗透色谱(GPC)分析TPI树脂的性能,然后测试分析了TPI薄膜的结构、吸水率、力学性能、热学性能和介电性能,并对其FCCL的相关性能进行测试。结果表明:TPI树脂均能溶解于NMP等强极性有机溶剂,相应薄膜的玻璃化转变温度(T_(g))均为236.8~325.6℃,5%热失重温度(T_(5%))为508.7~553.7℃,800℃残留率(R_(800))均高于64%,热膨胀系数(CTE)为56.36×10^(-6)~78.30×10^(-6)℃^(-1),拉伸强度为64.93~109.18 MPa,断裂伸长率为9.09%~24.60%,吸水率为0.74%~3.75%。综合性能相对较优的TPI-4的介电常数和介质损耗因数也相对较低,相应FCCL的剥离强度达到0.95 N/mm,但只能通过288℃/10 s的耐浮焊测试。此外,TPI-4中极性的苯酚侧基不仅保证了其有机溶解性,对其耐热性和机械强度也有明显的增强作用,同时还降低了其CTE值。具有反应活性的苯酚侧基为TPI的后续化学改性提供了极大的便利,通过加入少量的氰酸酯树脂(CE01)对其进行改性可以明显改善其与热固性PI薄膜或铜箔的粘接性能并提高相应FCCL的耐浮焊性。

关键词：聚酰亚胺挠性覆铜板可溶解热塑性粘接性耐热性

Development of a computed tomography-based radiomics nomogram for prediction of transarterial chemoembolization refractoriness in hepatocellular carcinoma

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World Journal of Gastroenterology 2021年第2期27卷 189-207页

作者： xiang-Ke niu Xiao-Feng He Department of Interventional Radiology Nanfang HospitalSouthern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Interventional Radiology Affiliated Hospital of Chengdu UniversityChengdu 610081Sichuan ProvinceChina

BACKGROUND Some patients with hepatocellular carcinoma(HCC)are more likely to experience disease progression despite continuous transarterial chemoembolization(TACE),which is called TACE *** present,it is still difficult to predict TACE refractoriness,although some models/scoring systems have been *** present,radiological-based radiomics models have been successfully applied to predict cancer patient *** To develop and validate a computed tomography(CT)-based radiomics nomogram for the pre-treatment prediction of TACE *** This retrospective study consisted of a training dataset(n=137)and an external validation dataset(n=81)of patients with clinically/pathologically confirmed HCC who underwent repeated TACE from March 2009 to March *** features were retrospectively extracted from preoperative CT images of the arterial *** pre-treatment radiomics signature was generated using least absolute shrinkage and selection operator Cox regression analysis.A CT-based radiomics nomogram incorporating clinical risk factors and the radiomics signature was built and verified by calibration curve and decision curve *** usefulness of the CT-based radiomics nomogram was assessed by Kaplan-Meier curve *** used the concordance index to conduct head-to-head comparisons of the radiomics nomogram with the other four models(Assessment for Retreatment with Transarterial Chemoembolization score;α-fetoprotein,Barcelona Clinic Liver Cancer,Child-Pugh,and Response score;CT-based radiomics signature;and clinical model).All analyses were conducted according to the transparent reporting of a multivariable prediction model for individual prognosis or diagnosis *** The median duration of follow-up was 61.3 mo(interquartile range,25.5-69.3 mo)for the training cohort and 67.1 mo(interquartile range,32.4-71.3 mo)for the validation *** median number of TACE sessions was 4(range,3-7)in both cohorts.E

关键词： Hepatocellular carcinoma Transarterial chemoembolization Refractoriness Radiomics Nomogram Computed tomography

热开关装置及在电卡制冷原型器件中的研究进展

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制冷学报 2024年第4期45卷 68-84页

作者：赖骏颖徐智毅牛翔何厚铸梁威关旭辉鲁圣国广东省智能材料和能量转化器件工程技术研究中心、广东工业大学材料与能源学院广州510006

电卡效应制冷是一种新兴的绿色固态制冷技术,由于具有成本低、COP高及可微型化等优点被认为是取代传统压缩机制冷的选择之一。现今阻碍电卡制冷器件应用的主要问题是电卡材料单片温变不足,在器件设计中采用回热式或串联式结构可将材料... 详细信息

电卡效应制冷是一种新兴的绿色固态制冷技术,由于具有成本低、COP高及可微型化等优点被认为是取代传统压缩机制冷的选择之一。现今阻碍电卡制冷器件应用的主要问题是电卡材料单片温变不足,在器件设计中采用回热式或串联式结构可将材料温变放大至工程应用量级。介绍了串联式电卡制冷器件中热开关装置的概念、性能指标及目前国内外相关研究成果并结合电卡效应原理分析了不同种类热开关在电卡制冷器件中的适配性。介绍了回热式和串联式电卡制冷原型器件的研究成果,基于串联式电卡制冷器件进行模拟计算,分析热开关装置的性能对制冷器件性能的影响。串联式结构理论上更适配于电卡制冷器件,利用电场驱动流体介质的热开关装置响应速度快、断开热阻大的特点可以帮助串联式电卡制冷器件突破现今技术瓶颈,从而发挥电卡制冷技术在各制冷系统领域的技术潜力。

关键词：热开关电卡效应固态制冷技术热管理技术

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热塑型聚酰亚胺的制备及其粘接性能研究

绝缘材料 2024年第7期57卷 22-27页

作者：陈文求陈伟贺娟牛翔李桢林范和平华烁科技股份有限公司湖北武汉430074 江汉大学湖北省化学研究院湖北武汉430056 华烁电子材料(武汉)有限公司湖北武汉430074

为了改善两层型挠性覆铜板(2L-FCCL)中热塑型聚酰亚胺(TPI)对热固型聚酰亚胺(PI)薄膜和铜箔的粘接性,本文选用具有柔性结构的芳香二酐单体和芳香或脂环的二异氰酸酯单体通过一步反应制备得到TPI样品,然后将其直接涂覆在表面经过预处理... 详细信息

为了改善两层型挠性覆铜板(2L-FCCL)中热塑型聚酰亚胺(TPI)对热固型聚酰亚胺(PI)薄膜和铜箔的粘接性,本文选用具有柔性结构的芳香二酐单体和芳香或脂环的二异氰酸酯单体通过一步反应制备得到TPI样品,然后将其直接涂覆在表面经过预处理的商品化热固型PI薄膜上得到复合膜,最后经过高温热压得到相应的2L-FCCL。通过观察所得TPI反应液的状态并进行DSC测试,选定了有机溶剂可溶且Tg为226.5℃的TPI-8;然后通过TGA、TMA和拉伸试验测得TPI-8的2%热分解温度(T2%)为464℃、50~200℃的热膨胀系数(CTE)为64.25×10^(-6)℃^(-1)、拉伸强度为64.52MPa、弹性模量为1.75 GPa、断裂伸长率为62%,并通过FTIR对其化学结构进行了确认;最后分别研究了两种热固型PI薄膜的碱水预处理时间对所得FCCL粘接性能的影响,发现其中SPI膜经60℃碱水处理1 min和3 min后得到的FCCL90°剥离强度(90°PS)≥0.7 N/mm且最大值达到0.94 N/mm,而UPI膜经同样热碱水处理1~7 min后得到的FCCL 90°PS均≤0.6 N/mm。因此,采用本方法可一步快速简单的制备可溶解且热学性能、力学性能、尺寸稳定性较好的TPI,同时其对铜箔以及表面经过碱水预处理的SPI具有较好的粘接性能,满足FCCL相关标准的要求。

关键词：聚酰亚胺挠性覆铜板热塑性热固性粘接性能

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Decomposition dynamics and ecological stoichiometry of Quercus acutissima and Pinus densiflora litter in the Grain to Green Program Area of northern China

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Journal of Forestry Research 2020年第5期31卷 1613-1623页

作者： Jianni Sun Peng Gao Haidong Xu Cheng Li xiang niu Forestry College Mountain Tai Forest Ecosystem Research Station of State Forestry AdministrationShandong Provincial Key Laboratory of Soil Erosion and Ecological RestorationShandong Agricultural UniversityTai’an 271018ShandongPeople’s Republic of China Research Institute of Forest Ecology Environment and ProtectionChinese Academy of ForestryBeijing Collaborative Innovation Center for Eco-Environmental Improvement With Forestry and Fruit TreesBeijing 100091People’s Republic of China

Litter decomposition and ecological stoichiometry of nutrient release is an important part of material cycling and energy flow in forest *** a study of the ecological stoichiometry and nutrient release during litter decomposition in a pine–oak forest ecosystem of the Grain to Green Program(GTGP)area of northern China,a typical pine and oak species(PDS:Pinus densiflora Sieb.,QAC:Quercus acutissima Carr.)were selected in the Taiyi Mountain study *** ecological stoichiometry characteristics of carbon(C),nitrogen(N)and phosphorus(P)and litter decomposition dynamics were studied by field sampling and quantitative *** results showed the following.(1)The decomposition dynamics of both litters was *** most important climatic factor affecting the litter decomposition rate from May to October was precipitation and temperature from November to April of the following year.(2)Throughout the 300-day study,in both litters,C of the two litters was released,N first accumulated and was then released,and P exhibited a release-accumulate-release pattern.(3)C:P was significantly higher than C:N and N:P(p<0.05);the C:N of PSD litter was higher than that of QAC(p<0.05),but the N:P of QAC litter was higher than that of PSD litter(p<0.05).The C:N of both litters was very high in the study area,indicating that the nutrient release ability during litter decomposition in the two typical pine–oak forest ecosystems was relatively weak;therefore,more attention should be paid to nitrogen-fixing species and mixed forests in the GTGP area of northern China.

关键词： Decomposition dynamics Ecological stoichiometry Litter Pinus densiflora Quercus acutissima Grain to Green Program(GTGP)