检索结果-内蒙古大学图书馆

2015 4th National Conference on Electrical,Electronics and Computer Engineering(NCEECE 2015)

作者： Qiang Wu Tao Song xuwen li College of Electronic Information and Control Engineering Beijing University of Technology College of Life Science and Bioengineering Beijing University of Technology

ISBN: (纸本)9781510819085

For the huge amount of image data, high transfer rate, high real-time requirements of the imaging system, this paper proposes a high-speed image data acquisition and storage system based on TMS320C6748 DSP, with the use of u PP interfaces to capture images from the FPGA in real time, using GPIO and UART to implement synchronous work between FPGA and DSP, using external DDR2 memory to design Ping-Pong buffering mechanism to ensure real-time hard disk storage of huge image *** results show that the designed system can achieve image data acquisition and storage both stably and rightly in the high-speed data transmission.

关键词： High-Speed Image uPP SATA DSP/BIOS

来源：评论

学校读者我要写书评

暂无评论

Pioneering Insights into the Reaction Kinetics of Metastable Intermolecular Composites Based on Metal Fluorides: Virtually non-existent condensed Phase Combustion Products and Ultra-Efficient Reactivity

引用

ADVANCED SCIENCE 2025年第14期12卷 e2415073页

作者： liu, xuwen li, Jingwei Feng, Shenghua Jia, Yongsheng Hu, Maocong Yao, Yingkang Sun, Jinshan Xie, Quanmin Sang, Hongqian Jianghan Univ State Key Lab Precis Blasting Wuhan 430113 Peoples R China Jianghan Univ Hubei Key Lab Blasting Engn Wuhan 430056 Peoples R China Anhui Univ Sci & Technol Sch Chem & Blasting Engn Huainan 232001 Peoples R China Jianghan Univ Sch Optoelect Mat & Technol Wuhan 430056 Peoples R China

As a typical representative of Metastable intermolecular composites (MICs), the energy release of nano-thermites relying on aluminum-oxygen reaction is limited by the formation of high boiling point condensed phase products. Low pressure output performance constitutes another pivotal factor influencing their efficacy. In this work, metal fluorides BiF3 at different scales were incorporated into nano-thermites as oxidants, thereby facilitating the tunability of the released energy. The boiling points of all resultant reaction products fall below the combustion temperature, theoretically abolishing the agglomeration of condensed-phase products, thus preventing the entrapment of active metals. Additionally, it facilitates the smooth conduction of heat flux, thereby averting losses in biphasic flow dynamics. The n-Al/n-BiF3 system exhibits a significant amplification in reactive kinetic properties in stark contrast to the n-Al/n-Bi2O3 system. The reduction in ignition threshold is ascribed to a novel reaction kinetics mechanism within the n-Al/BiF3 system. The highly electronegative fluorine within BiF3 corrodes the Al2O3 shell, inducing a "pre-ignition" reaction. The application of Density Functional Theory (DFT) evaluations has further corroborated the n-Al/n-BiF3 system's preeminence in electron transfer capacity between the oxidizing agent and fuel, thereby furnishing an molecular-electronic basis for its potent reactive kinetic properties.

关键词： combustion mechanism metal fluorides metastable intermolecular composites nanostructured energetic materials pre-ignition reactions

来源：评论

学校读者我要写书评

暂无评论

Evaluation of DNA Damage, Biomarkers of Oxidative Stress, and Status of Antioxidant Enzymes in Freshwater Fish (Labeo rohita) Exposed to Pyriproxyfen

引用

OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022年第0期2022卷 5859266页

作者： li, xuwen Naseem, Sumaira Hussain, Riaz Ghaffar, Abdul li, Kun Khan, Ahrar Nanjing Agr Univ Inst Tradit Chinese Vet Med Coll Vet Med Nanjing 210095 Peoples R China Nanjing Agr Univ Coll Vet Med MOE Joint Int Res Lab Anim Hlth & Food Safety Nanjing 210095 Peoples R China Islamia Univ Bahawalpur Dept Zool Bahawalpur 63100 Pakistan Islamia Univ Bahawalpur Fac Vet & Anim Sci Dept Pathol Bahawalpur 63100 Pakistan Univ Agr Faisalabad Fac Vet Sci Faisalabad 38040 Pakistan Shandong Vocat Anim Sci & Vet Coll Weifang 261061 Peoples R China

Pyriproxyfen (PPF) mimics a natural hormone in insects and disrupts their growth. It is a well-known synthetic insecticide and aromatic juvenile hormone analog frequently used in agriculture and vegetable crops to control various insect species. At present, scanty information is available about the possible potential threats of PPF in aquatic organisms. Therefore, in this study, different toxico-pathologic endpoints of PPF like DNA damage, biomarkers of oxidative stress, and status of antioxidant enzymes were determined in Labeo rohita (freshwater fish). In our study, 60 active, free from any external obvious ailments, same size, age, and body mass were randomly allocated to four glass aquaria (T0-T3) separately containing 100 L water. The fish present in groups T1, T2, and T3 were administered PPF dissolved in water 300, 600, and 900 mu g/L for 30 days. Different tissues including the blood and visceral organs were obtained from each fish on days 10, 20, and 30 of the experiment. Results on various morphological and nuclear changes in red blood cells of PPF-exposed Labeo rohita fish including pear-shaped erythrocytes, spherocytes, red blood cells with a blebbed nucleus, micronucleus, and nuclear remnants were significantly increased. Our results on genotoxicity (comet assay) recorded significantly (P <= 0.05) increased DNA damage in various tissues of insecticide-exposed fish. The results on oxidative stress profile (reactive oxygen species and thiobarbituric acid reactive substances) and antioxidant enzymes (reduced glutathione superoxide dismutase, peroxidase, and catalase) in multiple tissues of Labeo rohita fish concluded significantly (P <= 0.05) higher quantity of biomarkers of oxidative stress and lower concentrations of different antioxidant enzymes in treated fish. Hence, the findings of our experimental research determine that PPF could induce adverse toxic impacts on multiple tissues of Labeo rohita fish.

关键词： Oxidative stress

来源：评论

学校读者我要写书评

暂无评论

Establishment of a personalized fetal growth curve model

引用

TECHNOLOGY AND HEALTH CARE 2021年第1_suppl期29卷 S311-S317页

作者： Bao, Xinyu Wang, Yan Zhang, Song Yang, lin liu, Guoli Yang, Yimin li, xuwen Hao, Dongmei Chen, Aiqing liu, Xiaohong Shao, Jing Beijing Univ Technol Fac Environm & Life Sci Beijing 100124 Peoples R China Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100124 Peoples R China Peking Univ Peoples Hosp Beijing 100044 Peoples R China Beijing Yes Med Devices Co Ltd Beijing 100152 Peoples R China

BACKGROUND: Fetal weight is one of the important indicators for judging whether fetal growth and development are normal. Fetal weight exceeding the normal range may lead to poor delivery outcomes. OBJECTIVE: We aimed to establish a personalized fetal growth curve in order to effectively monitor fetal growth during pregnancy. Fetal weight can be monitored while fetal growth and development are assessed. METHODS: This study retrospectively analyzed the birth weight and ultrasound database of 3,093 newborns delivered at normal term. The personalized fetal growth curve model was generated based on the birth weight formula established by Gardosi combined with the proportional weight equation. RESULTS: (1) The average birth weight of the single fetus at normal term was 3,457g. (2) According to the regression results of the proportion of fetal weight in full-term pregnancy and gestational week, the proportional weight equation is Weight% = 500.9 + 51.60GA + 1.727GA(2) 0.01718GA(3) (GA is gestational week), R-2 is 98%, P < 0.001. CONCLUSIONS: In this study, the normal birth weight of newborns and normal range of fetal weight can be estimated by using the personalized fetal growth curve model.

关键词： Fetal weight fetal growth curve birth weight proportional weight equation normal range

来源：评论

学校读者我要写书评

暂无评论

Corn Stover-derived nanocellulose and lignin-modified particles: Pickering emulsion stabilizers and potential quercetin sustained-release carriers

引用

FOOD CHEMISTRY 2025年第Pt 2期465卷 142021页

作者： Wu, Xinling Zhang, Qiang Zhou, Deyi Zhang, li Zhou, Haigen Gao, Xiaodi Fang, xuwen Huo, Chao Zhang, Jinsong Jilin Univ Coll Biol & Agr Engn Changchun 130022 Peoples R China

Pickering emulsions (PEs) have wide applications in delivering nutraceuticals. However, the impact of extracting nanocellulose from corn stover on stabilizing PEs and delivering nutraceuticals remains unclear. In this study, four types of nanocellulose, cellulose nanocrystals (CNC), cellulose nanofibers (CNF), lignin-containing cellulose nanocrystals (LCNC), and lignin-containing cellulose nanofibers (LCNF) were successfully prepared from corn stover, an agricultural waste. Among them, LCNC and LCNF exhibited stable reticulated microstructures, lower crystallinity, and excellent thermal stability. Besides, lignin enhanced the nanoparticles' hydrophobicity, promoting the formation of more ideally amphiphilic particles, resulting in denser emulsions at the oil-water interface. Furthermore, emulsions stabilized by LCNC and LCNF demonstrated remarkable resistance to quercetin degradation under UV light exposure (with residual level exceeding 90 %) and improved quercetin's bioaccessibility during the in vitro digestion tests, achieving the highest bioaccessibility of 48.3 %. This study provided an innovative perspective on utilizing stover-derived materials for stabilizing PEs and delivering lipophilic nutrients.

关键词： Corn Stover nanocellulose lignin Pickering emulsion Quercetin delivery In vitro digestion

来源：评论

学校读者我要写书评

暂无评论

Omega-3 fatty acid ethyl-eicosapentaenoate attenuates IL-1β-induced changes in dopamine and metabolites in the shell of the nucleus accumbens:: Involved with PLA2 activity and corticosterone secretion

引用

NEUROPSYCHOPHARMACOLOGY 2007年第3期32卷 736-744页

作者： Song, Cai li, xuwen Kang, Zhijian Kadotomi, Yoshie Univ Prince Edward Isl AVC Dept Biomed Sci Charlottetown PE C1A 5T1 Canada Canada Natl Inst Nutrisci & Hlth Charlottetown PE Canada Univ British Columbia Dept Psychiat Vancouver BC V5Z 1M9 Canada

Previously, we have reported that interleukin- 1 beta ( IL- 1) induces changes in dopaminergic ( DA) and serotonergic systems in the core of nucleus accumbens ( NAc). We have also demonstrated that n-3 fatty acid ethyl-eicosapentaenoate ( EPA) can significantly reduce stress and anxiety- like behaviors, corticosterone concentration and peripheral inflammatory response induced by IL- 1 administration. Compared to the core, the shell is involved more in emotion, stress and psychiatric diseases. However, the relationship between inflammation and the functions of DA system in the shell has not been studied. Since phospholipase ( PL) A2 is a key enzyme in arachidonic acid ( AA)- eicosanoids- prostaglandin ( PG) E2 pathway, and the change in NAc dopaminergic system has been associated with glucocorticoid stimulation, therefore, the hypotheses of this study are ( 1) that IL- 1 induced changes in DA neurotransmission in the shell may be through PLA2- PGE2- corticosterone pathway;( 2) EPA may attenuate IL- 1 effects via inhibiting PLA2 activities, which blocks PGE2 stimulation of corticosterone. Using an in vivo microdialysis method, the present study showed that IL- 1 administration significantly increased extracellular levels of DA, and its metabolites 3,4- dihydroxyphenylacetic acid ( DOPAC) and homovanillic acid ( HVA) in the shell of the NAc. IL- 1 also increased blood concentration of corticosterone and PGE2, and increased the activities of cytosolic and sectory of PLA2. IL- 1- induced changes were significantly attenuated by EPA treatment. Furthermore, glucorcoticoid receptor antagonist mifepristone ( RU486) pretreatment significantly blocked IL- 1- induced changes in DA and metabolites. Qquinacrine, a PLA2 antagonist significantly blocked IL- 1 induced increase in PGE2 and corticosterone concentrations. These results demonstrated the hypotheses that IL- 1 effects may be via PLA2- PGE2- corticosterone pathway and EPA attenuated IL- 1 effects may be through the suppres

关键词： dopamine nucleus accumbens IL-1 beta n-3 fatty acid EPA PLA2 enzymes RU486

来源：评论

学校读者我要写书评

暂无评论

Comparison of the onset of uterine contractions determined from tocodynamometry and maternal perception 39

Comparison of the onset of uterine contractions determined f...

引用

39th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society (EMBC)

作者： Wang, Ying Gao, Pei Qiu, Qian An, Yang Hao, Dongmei Yang, Fangwei Zhou, Xiya Yang, lin Yang, Yimin li, xuwen Zhang, Song Zheng, Dingchang Beijing Univ Technol Coll Life Sci & Biomed Engn Beijing Peoples R China Yiwu Cent Hosp Dept Obstet & Gynaecol Yiwu Peoples R China Beijing Union Med Coll Hosp Dept Obstet & Gynaecol Beijing Peoples R China Anglia Ruskin Univ Hlth & Wellbeing Acad Fac Med Sci Chelmsford England

ISBN: (纸本)9781509028092

The aim of this study was to investigate the time difference (TD) between the onset of uterine contraction (UC) determined from tocodynamometry (TOCO) and identified by maternal perception. The online available Icelandic database was used to calculate TD, which was defined as the difference between when it was felt by a pregnant woman and the starting point on the UC signal recorded by a TOCO. A total of 295 TDs from 78 recordings (from a total of 33 participants;among them, 13 participants included at least 3 recordings from different gestational weeks) were analyzed with the overall mean +/- SD of TD calculated. For each individual participant with at least 3 recordings, regression analysis was then performed to investigate the relationship between the mean TD from each recording with gestational week, with their overall slope calculated. The results showed that 85.4% of TDs was within [-40, 40] s, with an overall mean TD of 3.04 s (p>0.05), indicating that there was no significant difference between the UC onset determined from TOCO and maternal perception. It was also noticed that 61.5% recordings (48 out of 78 recordings) had all positive or negative TD for all the UCs analyzed within a recording. Furthermore, the regression analysis showed that the regression line slope was negative for 10 out of the 13 participants with at least 3 recordings from different gestational weeks, resulting in that the overall slope (-2.85 +/- 5.58) was significantly negative (p<0.05), and indicating that UC onset TD decreased with gestational weeks. In summary, this study quantitatively investigated the TD between the onset of UCs determined from TOCO and maternal perception, providing scientific evidence for future studies to understand the underlying mechanism of the time sequence of UC activity determined from different techniques.

关键词： Pregnancy Databases Monitoring Physiology Hospitals Regression analysis Gynecology

来源：评论

学校读者我要写书评

暂无评论

Fetal growth prediction: Establishing fetal growth prediction curves in the second trimester

引用

TECHNOLOGY AND HEALTH CARE 2021年第1_suppl期29卷 S345-S350页

作者： Wang, Yan Bao, Xinyu Zhang, Song Yang, lin liu, Guoli Yang, Yimin li, xuwen Hao, Dongmei Chen, Aiqing liu, Xiaohong Shao, Jing Peking Univ Peoples Hosp Beijing 100044 Peoples R China Beijing Univ Technol Fac Environm & Life Sci Beijing 100124 Peoples R China Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100124 Peoples R China Beijing Yes Med Devices Co Ltd Beijing 100152 Peoples R China

BACKGROUND: Monitoring fetal weight during pregnancy has a guiding role in prenatal care. OBJECTIVE: To establish a personalized fetal growth curve for effectively monitoring fetal growth during pregnancy. METHODS: (1) This study retrospectively analyzed the birth weight database of 2,474 singleton newborns delivered normally at term. The personalized fetal growth curve model was formed by combining the estimating birth weight of newborns with the proportional weight formula. (2) Multiple linear stepwise regression method was used to estimate the birth weight of newborns. RESULTS: (1) Delivery gestational age, weight at first visit, maternal height, pre-pregnancy body mass index, fetal sex, parity had significant effects on birth weight. Based on these parameters, the formula for calculating term optimal weight was obtained (R-2 = 22.8%, P < 0.001). (2) The personalized fetal growth curve was obtained according to the epidemiological factors input model of each pregnant woman. CONCLUSIONS: A model of personalized fetal growth curve can be established, and be used to evaluate fetal growth and development through estimated fetal weight monitoring.

关键词： Fetal weight growth charts personal health services

来源：评论

学校读者我要写书评

暂无评论

基于随机森林模型的太湖水生植被遥感信息提取

引用

湖泊科学 2016年第3期28卷 635-644页

作者：侍昊李旭文牛志春李继影李杨李宁江苏省环境监测中心南京210036 苏州市环境监测中心站苏州215004 南京师范大学虚拟地理环境教育部重点实验室南京210023 南京大学生命科学学院南京210046

水生植被作为太湖湿地的重要组分,其数量和范围变化影响着湖泊生态系统的平衡,故利用遥感技术对水生植被的空间分布开展研究有助于太湖湿地生态系统的保护.以Landsat 8多光谱遥感影像为主要数据源,利用光谱指数和图像变换方法构建多个... 详细信息

水生植被作为太湖湿地的重要组分,其数量和范围变化影响着湖泊生态系统的平衡,故利用遥感技术对水生植被的空间分布开展研究有助于太湖湿地生态系统的保护.以Landsat 8多光谱遥感影像为主要数据源,利用光谱指数和图像变换方法构建多个特征变量,结合随机森林(RF)模型,提取太湖水生植被的空间分布.结果表明:(1)通过对比分析训练样本特征值的平均值、标准差和变异系数,NDVI、NDWIF、SR等指数更易于区分开敞水域和沉水植被、浮叶植被和挺水植被;(2)当设置1000棵分类树和4个分割节点的随机变量时,RF分类模型的袋外误分率小于6%,误分主要受SR、MNDWI和NDVI等特征变量影响;(3)通过验证分析,基于RF模型获得的2014年7月太湖水生植被覆盖面积约为306.0km2,分类精度为88.56%(Kappa系数为0.88),主要分布在湖体的东部和南部,以沉水和浮叶植被为主,两者占水生植被覆盖总面积的84.9%.

关键词：水生植被随机森林模型特征变量 Landsat 8 太湖

来源：评论

学校读者我要写书评

暂无评论

认知视角下企业战略变革过程中的冲突形成研究

引用

管理评论 2019年第4期31卷 162-174页

作者：李旭文齐中英哈尔滨工业大学管理学院哈尔滨150000 中国航天科技集团有限公司北京100048

本文以认知为视角,从微观层面对企业战略变革中的冲突形成进行了研究。首先,界定冲突的内涵与类别,并从认知主体、认知与认知客体角度分析了冲突形成的一般成因与战略变革成因。其次,以企业战略变革过程为主线,分析了企业高层、中层与... 详细信息

本文以认知为视角,从微观层面对企业战略变革中的冲突形成进行了研究。首先,界定冲突的内涵与类别,并从认知主体、认知与认知客体角度分析了冲突形成的一般成因与战略变革成因。其次,以企业战略变革过程为主线,分析了企业高层、中层与执行层管理者由于角色定位、注意力关注与认知图式的不同,在纵向与横向之间形成任务认知冲突、过程认知冲突与关系认知冲突的机理,建构了企业战略变革过程中冲突形成的理论模型。最后,以中国航天科技集团有限公司为研究样本,通过调查问卷方式开展了实证研究,结果表明:战略变革知觉与冲突显著正相关;战略变革与任务认知冲突、关系认知冲突显著正相关;战略变革与过程认知冲突不相关。

关键词：冲突形成战略变革认知视角企业战略

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：