检索结果-南通市图书馆

The evolution of robotics:research and application progress of dental implant robotic systems

维普期刊数据库评论

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 Oral Science 2024年第2期16卷 173-185页

作者： Chen Liu Yuchen Liu Rui Xie zhiwen Li Shizhu Bai Yimin Zhao State Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration Xi’anChina National Clinical Research Center for Oral Diseases Xi’anChina Shaanxi Key Laboratory of Stomatology Xi’anChina Digital Center School of StomatologyThe Fourth Military Medical UniversityXi’anChina

The use of robots to augment human capabilities and assist in work has long been an *** has been developing since the 1960s when the first industrial robot was *** technology has advanced,robotic-assisted surgery has shown numerous advantages,including more precision,efficiency,minimal invasiveness,and safety than is possible with conventional techniques,which are research hotspots and cutting-edge *** article reviewed the history of medical robot development and seminal research papers about current research *** the autonomous dental implant robotic system as an example,the advantages and prospects of medical robotic systems would be discussed which would provide a reference for future research.

关键词： robot robotic application

Validity of a digital self-administered tool for nutritional screening and dietary assessment in cancer patients: A diagnostic test accuracy study

在线全文

学校读者我要写书评

暂无评论

Validity of a digital self-administered tool for nutritional...

中国营养学会第十五届全国营养科学大会

作者： zhiwen long Shan Huang Jie Zhang Jun Yin Deng Zhang Huilin Xu Jialiang Wang Qinqiu Zhang Chengyuan He Ke Xie Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital

Malnutrition is one of the common and severe problems for cancer patients, which directly increase the incidence of complications and even cause a significant deterioration in the quality of life. Nutritional Risk Screening Tool(NRS-2002) and Abridged Scored Patient-Generated Subjective Global Assessment(abPGSGA) were widely applied in cancer patients, to identify nutritional risk, as well as the Nutrients-Targeted 24-hour recall(NT 24-hr) to guide nutrition therapy dosage. However, high rate of malnourished cancer patients remained undetected and untreated due to the limited time for clinicians to conduct face-to-face malnutrition screening and time-consuming dietary recalls. Therefore, this study was designed to validate the performance of a digital self-administered tool in evaluating the risk of malnutrition and dietary nutrients intakes in hospitalized cancer patients. Methods Consecutive patients were identified for eligibility and recruited in the Oncology Department of Sichuan People’s Hospital from Mar 2021 to Apr 2021. Demographic and medical record information were derived from hospital database and checked by two researchers respectively. By using the R+ dietitian, a WeChat-based mini program, all participants were required to complete the NRS-2002, abPG-SGA and NT 24-hr independently, within 24 hours after admission to hospital. The malnutrition screening and predicted daily energy/protein intake values were automatically output afterwards. As the reference standard to conduct nutritional risk screening and dietary information collection, face-to-face NRS2002 and abPG-SGA scales were conducted by two trained dietitians on the same day, as well as the 3-day 24-hour recalls(3 d 24-hrs), to achieve nutrition screening results and detailed dietary intake information about all foods and beverages. Daily nutrients values, including energy and protein intake, would be calculated through food composition table. All statistical analyses were performed using SAS

关键词： Digital health Diagnostic test accuracy study Nutritional screening Dietary assessment Cancer

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

关于周期函数的再思考

高等数学研究 2019年第4期22卷 57-59页

作者：龙志文湖南人文科技学院数学与金融学院

本文一方面基于周期集的性质考虑了周期函数的最小正周期问题,另一方面比较自然地将周期函数推广到概周期函数,并举例说明了两个周期函数的和函数一定为概周期函数.

关键词：周期函数最小正周期可数集概周期函数

在线全文

学校读者我要写书评

暂无评论

波动引理的三个证明

高等数学研究 2019年第1期22卷 81-83页

作者：龙志文湖南人文科技学院数学与金融学院湖南娄底417000

本文利用多种数学分析的技巧,结合数列和函数上下极限的性质,给出了波动引理的三种证明.

关键词：波动引理罗尔定理拉格朗日中值定理达布定理.

在线全文

学校读者我要写书评

暂无评论

实数若干性质的证明及其应用

高等数学研究 2022年第1期25卷 71-73页

作者：龙志文湖南人文科技学院数学与金融学院湖南娄底417000

本文介绍实数的阿基米德性、稠密性等性质的证明及其应用,同时也推广了已有文献的相关结论.

关键词：阿基米德性稠密性有理数无理数

在线全文

学校读者我要写书评

暂无评论

浅谈摇奖机原理及发展前景

现代制造技术与装备 2021年第6期57卷 131-132页

作者：龙志文株洲市机械工业研究所株洲412000

摇奖机是以科学原理为基础,并经过反复试验和论证,以展示公平公正的一种机器。针对摇奖机分类、基本参数进行分析和阐述,深入研究和探讨几种典型摇奖机的原理,提出摇奖机未来的发展方向和设计开发关键创新点。

关键词：摇奖机原理装置

Co-occurrence of per- and polyfluoroalkyl substances, heavy metals and polycyclic aromatic hydrocarbons and their composite impacts on microbial consortium in soil: A field study

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第4期34卷 736-748页

作者： Meng ZHANG Qing WANG Xin SONG Mukhtiar ALI zhiwen TANG Xin LIU Zhuanxia ZHANG Shurong MA Jinhui BI Zhongyuan LI Key Laboratory of Saline-Alkali Vegetation Ecology Restoration Northeast Forestry UniversityHarbin 150040China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Center International Group Co. Ltd.Beijing 101160China China Construction Eighth Engineering Division Corp. Ltd.Shanghai 200122China

This is the first study to report the co-occurrence of per-and polyfluoroalkyl substances(PFASs),heavy metals,and polycyclic aromatic hydrocarbons(PAHs)and their impacts on the native microbial consortium in soil due to the long-term *** PFASs,heavy metals,and PAHs were detected in soil samples collected at 2–6 m below the ground surface at different sampling locations in a steel-making *** total concentrations of PFASs varied from 6.55 to 19.79 ng g^(-1),with perfluorooctane sulfonate(PFOS),perfluorobutane sulfonate,and 6:2 chlorinated polyfluorinated ether sulfonate(alternative of PFOS)being the predominant *** concentrations of arsenic,cadmium,and lead were detected in the ranges of 4.40–1270.00,0.01–8.67,and 18.00–647.00 mg kg^(-1),respectively,and the concentration of total PAHs was detected in the range of 1.02–131.60 mg kg^(-1).The long-term exposure to mixed contaminants of PFASs,heavy metals,and PAHs led to lower richness and diversity of microbial communities in *** soil bacterial communities were mainly composed of Pseudomonas,norank_p_GAL15,Leptothrix,norank_o_Rokubacteriales,and *** between soil environmental factors and microbial communities indicated that cation exchange capacity and total phosphorus were two key factors in shaping the composition of native microbial ***,Arthrobacter,Leptothrix,and Sphingobium were found to be significantly positively correlated with PFAS concentrations,indicating that these genera could tolerate the stress exerted by PFASs,along with the stress imposed due to the presence of heavy metals or/and PAHs.

关键词： arsenic cation exchange capacity mixed contaminant native microbial community perfuorooctane sulfonate total phosphorus

Pipeline thickness estimation using the dispersion of higher-order SH guided waves

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第7期33卷 389-396页

作者：代政辰刘金霞龙云飞张建海 Tribikram Kundu 崔志文 Department of Acoustics and Microwave Physics College of PhysicsJilin UniversityChangchun 130012China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130025China Department of Civil and Architectural Engineering and Mechanics University of ArizonaTucsonArizona 85721USA College of Aerospace and Mechanical Engineering University of ArizonaTucsonAZ 85721USA State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China

Thickness measurement plays an important role in the monitoring of pipeline corrosion damage. However, the requirement for prior knowledge of the shear wave velocity in the pipeline material for popular ultrasonic thickness measurement limits its widespread application. This paper proposes a method that utilizes cylindrical shear horizontal(SH) guided waves to estimate pipeline thickness without prior knowledge of shear wave velocity. The inversion formulas are derived from the dispersion of higher-order modes with the high-frequency approximation. The waveform of the example problems is simulated using the real-axis integral method. The data points on the dispersion curves are processed in the frequency domain using the wave-number method. These extracted data are then substituted into the derived formulas. The results verify that employing higher-order SH guided waves for the evaluation of thickness and shear wave velocity yields less than1% error. This method can be applied to both metallic and non-metallic pipelines, thus opening new possibilities for health monitoring of pipeline structures.

关键词： pipeline wall thickness higher-order modes SH guided waves dispersion

基于纸纤维/晶须状碳纳米管/活性炭三元无金属集流体复合纸电极的柔性超级电容器

在线全文

学校读者我要写书评

暂无评论

材料导报 2017年第16期31卷 6-11,15页

作者：蔡满园孙晓刚聂艳艳刘珍红邱治文陈珑南昌大学机电工程学院南昌330031

以纸纤维(PF)为基体,晶须状碳纳米管(WCNT)和活性炭(AC)为功能添加物,采用真空抽滤法制成PF/WCNT/AC三元无金属集流体复合电极。利用扫描电子显微镜(SEM)、X射线衍射(XRD)光谱仪、拉曼(Raman)光谱仪对其进行表征和分析,采用两电极测试... 详细信息

以纸纤维(PF)为基体,晶须状碳纳米管(WCNT)和活性炭(AC)为功能添加物,采用真空抽滤法制成PF/WCNT/AC三元无金属集流体复合电极。利用扫描电子显微镜(SEM)、X射线衍射(XRD)光谱仪、拉曼(Raman)光谱仪对其进行表征和分析,采用两电极测试体系对组装的超级电容器性能进行测试。结果表明,与涂布法所得的铝箔集流体(Al/WCNT/AC)电极相比,由PF/WCNT/AC三元复合电极组装的超级电容器比电容大幅提高,并展现出良好的充放电性能。在1mV/s的扫描速率下比电容达325F/g,几乎是Al/WCNT/AC超级电容器(108.7F/g)的3倍。PF/WCNT/AC超级电容器在0.4A/g电流密度下的比电容为95F/g,在3.2A/g电流密度下的比能量与比功率分别为36.76 Wh/kg、5.52kW/kg。

关键词：活性炭晶须状碳纳米管纸纤维柔性超级电容器无金属集流体纸电极