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仅有单个陀螺的Drag-free卫星初始速率阻尼模糊控制研究 被引量:1
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作者 党朝辉 项军华 刘昆 《上海航天》 2012年第1期6-11,共6页
研究了在仅有偏航姿态测量陀螺时,利用Drag-free卫星与其内部定向体间的相对状态观测值实现姿态确定的方法。针对Drag-free卫星的特点,建立了定向体的空间姿态观测模型和Drag-free卫星的姿态动力学方程,据此推导了用于姿态确定的Kalman... 研究了在仅有偏航姿态测量陀螺时,利用Drag-free卫星与其内部定向体间的相对状态观测值实现姿态确定的方法。针对Drag-free卫星的特点,建立了定向体的空间姿态观测模型和Drag-free卫星的姿态动力学方程,据此推导了用于姿态确定的Kalman滤波算法。为实现初始速率阻尼阶段Drag-free卫星的三轴姿态稳定,设计了模糊控制律。仿真结果验证了方法的有效性。 展开更多
关键词 Drag—free卫星 单个陀螺 初始速率阻尼 模糊控制
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基于F-B NCP函数的可行QP-free算法
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作者 朱笑荣 《泰山学院学报》 2012年第3期43-47,共5页
本文得到一种可行QP-free算法,引入ε-有效集策略使得每次迭代只需求解规模较小的线性方程组得到迭代方向,且方程组只包含工作集中的约束,其规模较原问题大大减小,同时不进行弧搜索,从而降低了运算量.
关键词 QP—free算法 可行性 ε-有效集
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TOPS模式哨兵-1雷达干涉图误差校正技术 被引量:2
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作者 徐航 陈富龙 +1 位作者 唐攀攀 张达 《测绘通报》 CSCD 北大核心 2019年第10期114-118,共5页
哨兵-1系统因其优质的设备参数及开放性的政策具有很高的学术及应用价值,然而其特殊的TOPS成像模式对利用该数据的干涉处理与分析提出了挑战。本文对影响哨兵-1 TOPS模式数据干涉质量的数据配准、电离层及对流层因素进行了定量化分析,... 哨兵-1系统因其优质的设备参数及开放性的政策具有很高的学术及应用价值,然而其特殊的TOPS成像模式对利用该数据的干涉处理与分析提出了挑战。本文对影响哨兵-1 TOPS模式数据干涉质量的数据配准、电离层及对流层因素进行了定量化分析,提出了基于ESD,以及GPS、ECMWF等外部数据源校正的TOPS哨兵-1模式干涉图误差校正技术;以一对2016年某区域的哨兵-1 TOPS模式影像为研究数据,对其依次进行了精配准、电离层相位和对流层相位系统校正。研究结果表明,配准精度能够满足数据1/1000像元的精度要求;能去除电离层条带相位和方位向相位跳变;进而实现对流层相位约27%标准差精度的提升。此技术能够显著减小哨兵-1 TOPS模式数据的干涉误差,提高其在差分雷达干涉乃至时序差分雷达干涉等形变监测中的应用价值。 展开更多
关键词 哨兵-1 topS 配准 大气校正 变形监测
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Process for improving the ladle free- opening rate for high aluminum steel in continuous casting 被引量:3
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作者 LIU Junzhan ZHOU Tongjun LUO Hui 《Baosteel Technical Research》 CAS 2015年第1期42-45,共4页
Steel 20Mn23AlV is a type of high aluminum steel with a very low ladle free-opening rate. The aluminum composition of 20Mn23AlV ranges from 1.6% to 2.45% ,which is significantly higher than other types of steel. Accor... Steel 20Mn23AlV is a type of high aluminum steel with a very low ladle free-opening rate. The aluminum composition of 20Mn23AlV ranges from 1.6% to 2.45% ,which is significantly higher than other types of steel. According to the real condition of 40 t ladle in steel-making plant of Baosteel Special Steel Company, previous works show that the key factors affecting the ladle free-opening rate of high aluminum steel in continuous casting are:sand material, accessories baking, ladle nozzle cleaning, the process and amount of adding sand, and the rate of argon stirring during refining. Therefore, improving the ladle filler sand quality, baking all of the raw materials, controlling the addition of ladle filler sand, cleaning the ladle nozzle, and optimizing argon stirring during the refining process can resolve the problem of a low ladle free-opening rate of high aluminum steel caused by the long ladle time of liquid steel. 展开更多
关键词 continuous casting high aluminum steel LADLE free - opening rate
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Development of Debris-free Laser Plasma Sources for EUV Lithography in CIOMP 被引量:1
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作者 CHEN Bo, NI Qi liang,CAO Jian lin (State Key Laboratory of Applied Optics,Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun 130022, China) 《光学精密工程》 EI CAS CSCD 2001年第5期442-445,共4页
We have been developing debris-free laser plasma sources for EUV lithography since 1996. Two types of debris-free sources, such as cryogenic target and gas-puff target laser plasma sources, were designed and built up ... We have been developing debris-free laser plasma sources for EUV lithography since 1996. Two types of debris-free sources, such as cryogenic target and gas-puff target laser plasma sources, were designed and built up in CIOMP. EUV radiation spectra of the sources with a variety of targets have been obtained by different ways. 展开更多
关键词 EUV LITHOGRAPHY laser plasma DEBRIS - free CRYOGENIC TARGET gas - PUFF TARGET
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EXACT SOLUTION FOR RECTANGULAR SLAB WITH THREE EDGES SIMPLY-SUPPORTED AND OTHER FREE
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作者 YU TENGHAIDepartment of Mathematics 《内江师范学院学报》 1996年第2期1-7,共7页
In this paper,we give all-sided pastic analysis of the rectangular slab with three edges simply-supported and other free.Here we discuss the following four cases:(1)The uniformly distributedload over the area a slab.(... In this paper,we give all-sided pastic analysis of the rectangular slab with three edges simply-supported and other free.Here we discuss the following four cases:(1)The uniformly distributedload over the area a slab.(2).A concentrated load act at midpoint of free edges slab.(3)A concen-trated load act at the center a slab.(4)The line load act along free edge of slab. 展开更多
关键词 The RECTANGULAR SLAB with three EDGES simply - SUPPORTED and OTHER free have wide the use value. But up to now only find the EXACT solution that a concentrated load act at midpoint of free edye a slab. The EXACT solution of OTHER support force
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Influence of 10-(6-plastoquinonyl) decyltriphenylphosphonium on free-radical homeostasis in the heart and blood serum of rats with streptozotocin-induced hyperglycemia
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作者 Aleksander A Agarkov Tatyana N Popova Yana G Boltysheva 《World Journal of Diabetes》 2019年第12期546-559,共14页
BACKGROUND It is known that under conditions of tissue tolerance to insulin,observed during type 2 diabetes mellitus(DM2),there is an increased production of reactive oxygen species.Moreover,the free radicals can init... BACKGROUND It is known that under conditions of tissue tolerance to insulin,observed during type 2 diabetes mellitus(DM2),there is an increased production of reactive oxygen species.Moreover,the free radicals can initiate lipid peroxidation(LPO)in lipoprotein particles.The concentration of LPO products can influence the state of insulin receptors,repressing their hormone connection activity,which is expressed as a reduction of the glucose consumption by cells.It is possible that reduction in glucose concentration during administration of 10-(6-plastoquinonyl)decyltriphenylphosphonium(SkQ1)to rats with DM2 may be related to the antioxidant properties of this substance.AIM To establish the influence of SkQ1 on free-radical homeostasis in the heart and blood serum of rats with streptozotocin-induced hyperglycemia.METHODS To induce hyperglycemia,rats were fed a high-fat diet for 1 mo and then administered two intra-abdominal injections of streptozotocin with a 7-d interval at a 30 mg/kg of animal weight dose with citrate buffer equal to pH 4.4.SkQ1 solution was administered intraperitoneally at a 1250 nmol/kg dose per day.Tissue samples were taken from control animals,animals with experimental hyperglycemia,rats with streptozotocin-induced glycemia that were administered SkQ1 solution,animals housed under standard vivarium conditions that were administered SkQ1,rats that were administered intraperitoneally citrate buffer equal to pH 4.4 once a week during 2 wk after 1-mo high-fat diet,and animals that were administered intraperitoneally with appropriate amount of solution without SkQ1(98%ethanol diluted eight times with normal saline solution).To determine the intensity of free radical oxidation and total antioxidant activity,we used the biochemiluminescence method.Aconitate hydratase(AH),superoxide dismutase,and catalase activities were estimated using the Hitachi U-1900 spectrophotometer supplied with software.The amount of citrate was determined by means of the Natelson method.Real-time polymerase chain reaction was carried out using an amplifier ANK-32.RESULTS It was found that the mitochondrial-directed antioxidant elicits decrease of biochemiluminescence parameter values that increase by pathology as well as the levels of primary products of LPO,such as diene conjugates and carbonyl compounds,which indicate intensity of free radical oxidation.At the same time,the activity of AH,considered a crucial target of free radicals,which decreased during experimental hyperglycemia,increased.Apparently,increasing activity of AH influenced the speed of citrate utilization,whose concentration decreased after administering SkQ1 by pathology.Moreover,the previously applied antioxidant during hyperglycemia influenced the rate of antioxidant system mobilization.Thus,superoxide dismutase and catalase activity,as well as the level of gene transcript under influence of SkQ1 at pathology,were changing to the direction of control groups values.CONCLUSION According to the results of performed research,SkQ1 can be considered a promising addition to be included in antioxidant therapy of DM2. 展开更多
关键词 Diabetes mellitus free radical oxidation ANTIOXIDANTS 10-(6-plastoquinonyl)decyltriphenylphosphonium
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顶/底部变频交替进水的厌氧氨氧化系统特性
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作者 李冬 陶博 张杰 《中国环境科学》 EI CAS CSCD 北大核心 2024年第11期6057-6067,共11页
针对厌氧氨氧化污泥颗粒化过程较慢且易受水力剪切力和基质浓度波动的影响,颗粒污泥的传质性能随着粒径的增长逐渐恶化,进而导致系统脱氮性能受限问题,提出一种顶/底部变频交替进水运行模式,通过延长进水时间,并增设回流提供充足水力剪... 针对厌氧氨氧化污泥颗粒化过程较慢且易受水力剪切力和基质浓度波动的影响,颗粒污泥的传质性能随着粒径的增长逐渐恶化,进而导致系统脱氮性能受限问题,提出一种顶/底部变频交替进水运行模式,通过延长进水时间,并增设回流提供充足水力剪切力,改变顶/底部交替进水位置及频次,有效降低了基质浓度对厌氧氨氧化菌的冲击负荷,强化了系统脱氮性能.探究了系统运行期间污泥浓度、颗粒性能、EPS分泌和脱氮稳定性等变化情况.结果表明,该进水模式下总氮去除率达84.80%,颗粒平均粒径为783.67μm,EPS含量为169.13mg/gVSS.增加进水负荷后,游离氨最高浓度为9.70mg/L,未对系统造成抑制作用.显微镜结果显示,该进水模式下系统内颗粒颜色较深,血红素c含量较高,AnAOB活性较佳.高通量测序结果表明,顶/底部变频交替进水模式能够大幅提高系统内厌氧氨氧化菌属Candidatus_Brocadia的丰度,当交替频次为3次时达43.59%的最高占比.该进水方式加快了污泥与底物的混合,缩短了颗粒化进程,同时提升了污泥活性和抗冲击负荷能力,实现了厌氧氨氧化系统的稳定运行. 展开更多
关键词 顶底部变频交替进水 游离氨 回流系统 饥饿时长
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测量机器人在地铁变形监测中的应用研究
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作者 蔡少辉 《科技资讯》 2024年第8期177-180,202,共5页
为了更好地监测基坑水平位移,研发了一种基于自由设站的测量机器人,它能够在极端环境下准确监测桩顶水平位移,具有良好的准确性和灵活性。这种技术不仅可以在深基坑桩顶水平位移监测上得以体现,还可以在新建隧道的施工过程中,有效监测... 为了更好地监测基坑水平位移,研发了一种基于自由设站的测量机器人,它能够在极端环境下准确监测桩顶水平位移,具有良好的准确性和灵活性。这种技术不仅可以在深基坑桩顶水平位移监测上得以体现,还可以在新建隧道的施工过程中,有效监测隧道道床的沉降、收敛和水平位移,为施工带来更加可靠的数据支撑。经过多次实验,发现测量机器人使用实时自动化监控技术能够给出准确信息,并且在很大程度上改善了建筑物/构造物的三维变形检查。这种技术不仅为建设项目的安全提供了参考,而且也为其他领域的研究提供了新的思路。 展开更多
关键词 测量机器人 自由设站 基坑桩顶水平位移 既有线
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(K1,4;2)-图的闭包和周长 被引量:1
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作者 赵海霞 马巧灵 张苏梅 《山东师范大学学报(自然科学版)》 CAS 2010年第1期42-44,共3页
针对(K1,4;2)-图这一新的图类,证明了以下结论:1)设G是δ≥5且K1∨P4-free的(K1,4;2)-图,则c(G)=c(cl(G));2)设G是δ≥5且T3-free的(K1,4;2)-图,则c(G)=c(cl(G)).
关键词 闭包 (K1 p q)- HAMILTON图 F—free 局部连通点
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(K_(1,4);2)-图的3-闭包中的路 被引量:1
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作者 赵海霞 马巧灵 张苏梅 《科学技术与工程》 2010年第6期1333-1336,共4页
对(K1,4;2)-图,证明它的3-闭包的一个性质。G为{K1∨P5,T3}-free或K1∨P4-free的(K1,4;2)图,x,a,b为G中不同三点,x为G中局部3-连通的适宜点,G′由G在点x局部完备所得。若G′中有长为l的(a,b)-路,则G中有长为l的(a,b)-路。
关键词 k-闭包 (K1 P q)- F—free 局部k-连通图
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扩孔参数对AF1410超高强度钢切屑微观形貌的影响
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作者 何世琦 宋万万 +2 位作者 郑英晓 王奔 张秀云 《工具技术》 北大核心 2024年第6期61-64,共4页
通过对AF1410钢扩孔加工试验探究主轴转速和进给速度对切屑微观形貌的影响,为改善切屑形貌提升AF1410超高强度钢的扩孔质量提供依据。对有典型形貌特征切屑的自由表面、后表面和上表面进行观测,结果表明,切屑自由表面均为锯齿状片层结... 通过对AF1410钢扩孔加工试验探究主轴转速和进给速度对切屑微观形貌的影响,为改善切屑形貌提升AF1410超高强度钢的扩孔质量提供依据。对有典型形貌特征切屑的自由表面、后表面和上表面进行观测,结果表明,切屑自由表面均为锯齿状片层结构且锯齿片层的宽度随主轴转速和进给速度的增加而增加。切屑后表面整体较光滑,随着主轴转速的增加,后表面光滑程度增加,利于提升已加工表面质量,且在主轴转速为800r/min时,顶部出现撕裂锯齿状毛边,同时进给速度对后表面影响较小。切屑上表面均呈周期锯齿状,切屑厚度随主轴转速增加而减小,锯齿高度随着主轴转速和进给速度的增加而增加。 展开更多
关键词 AF1410超高强度钢 扩孔参数 切屑微观形貌 自由表面 后表面 上表面
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中国-东盟博览会对CAFTA建设的影响 被引量:1
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作者 周苹 《对外经贸实务》 北大核心 2009年第7期78-81,共4页
一、中国-东盟博览会概述 中国-东盟博览会是推动中国-东盟自由贸易区(China-AS—EAN Free Trade Area,以下简称CAFTA)建设的实质行动。2003年10月在第七次中国-东盟领导人会议上,中国国务院总理温家宝建议,从2004年起每年在中国... 一、中国-东盟博览会概述 中国-东盟博览会是推动中国-东盟自由贸易区(China-AS—EAN Free Trade Area,以下简称CAFTA)建设的实质行动。2003年10月在第七次中国-东盟领导人会议上,中国国务院总理温家宝建议,从2004年起每年在中国广西南宁举办中国-东盟博览会,同时建议同期举办中国-东盟商务与投资峰会。这一建议,得到了各国领导人的普遍欢迎和响应。 展开更多
关键词 中国-东盟博览会 CAFTA 中国-东盟自由贸易区 领导人会议 国务院总理 free EAN 温家宝
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施工电梯基础与地下室顶板一体化深化设计思路与施工要点分析
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作者 刘林钊 谢显鹏 +5 位作者 满宁宁 苏涛 赵祺 张鹏 左丽娜 李文斌 《科技创新与应用》 2024年第6期112-115,共4页
在逆作法施工中,一般以地下室顶板为界面层,向上施工主体结构,向下开挖土方并施工地下室结构,导致施工电梯基础无法像常规项目设置在顶板上并下设回顶支撑。为解决以顶板为界的逆作法项目施工电梯基础无法回顶的问题,需找到一种与地下... 在逆作法施工中,一般以地下室顶板为界面层,向上施工主体结构,向下开挖土方并施工地下室结构,导致施工电梯基础无法像常规项目设置在顶板上并下设回顶支撑。为解决以顶板为界的逆作法项目施工电梯基础无法回顶的问题,需找到一种与地下室顶板相结合的免回顶支撑施工电梯基础。该文以勤诚达云邸项目施工电梯基础深化设计为例,仔细分析施工电梯基础定位位置、原有结构梁板位置及受力要求,通过改变板厚度、调整配筋、增加受力梁和把控施工过程等,详细阐述逆作法项目中施工电梯基础与地下室顶板一体化、免回顶支撑的深化设计思路与施工要点。 展开更多
关键词 施工电梯基础 一体化 逆作法 设计思路 免回顶支撑
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巷道无煤柱开采数值模拟及实验分析
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作者 石磊 《山西化工》 CAS 2024年第7期208-209,214,共3页
针对某煤矿煤炭资源回收率低、资源浪费严重的问题,在4303工作面上使用无煤柱开采技术,运用FLAC 3D软件对工作面压力显现建立数值模拟,并进行受力分析与现场实测。结果表明:使用无煤柱开采技术切顶沿空留巷后,顶底板下沉量基本稳定在70... 针对某煤矿煤炭资源回收率低、资源浪费严重的问题,在4303工作面上使用无煤柱开采技术,运用FLAC 3D软件对工作面压力显现建立数值模拟,并进行受力分析与现场实测。结果表明:使用无煤柱开采技术切顶沿空留巷后,顶底板下沉量基本稳定在70 mm左右,巷道开拓量减少,资源回收率上升,增加矿井开采寿命。 展开更多
关键词 无煤柱开采 数值模拟 切顶卸压
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Synthesis of Wax Esters by Lipase-catalyzed Esterification with Immobilized Lipase from Candida sp. 99-125 被引量:8
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作者 邓利 王晓静 +4 位作者 聂开立 王芳 刘军峰 王璞 谭天伟 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第6期978-982,共5页
Wax esters were synthesized in a solvent free system catalyzed by immobilized lipase from Candida sp. 99-125, with oleic acid and cetyl alcohol. The effects of substrate molar ratio, lipase dosage and water removal we... Wax esters were synthesized in a solvent free system catalyzed by immobilized lipase from Candida sp. 99-125, with oleic acid and cetyl alcohol. The effects of substrate molar ratio, lipase dosage and water removal were investigated in a 50 ml flask incubated in a thermostatic cultivation cabinet. The optimized conditions were: temperature 40 ℃, shaking at 170 r·min-1, acid/alcohol molar ratio 1:0.9, lipase dosage in 10% (by mass) of oleic acid, and open reaction for water removal. As a result, the conversion rate reached 98% for reaction of 8 h. The volume of reactor was scaled up to 1 L three-neck flask. The optimized parameters were: 200 r·min-1 agitation speed, 2.5% (by mass) lipase dosage, others were the same as the parameters described above. The conversion rate reached 95% for reaction of 24 h. The lipase retained 46% conversion rate after reuse for 6, 7 batches. The products were purified by removing remained cetyl alcohol and fatty acids with ethanol and saturated sodium carbonate so-lution, respectively. The purity of the wax ester, cetyl oleate, was 96%. The physical and chemical properties of cetyl oleate were tested and compared with those of jojoba oil. The results show that the product cetyl oleate has great potential to use as the substitute of natural jojoba oil. 展开更多
关键词 solvent free system Candida sp. 99-125 LIPASE wax ester
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Protective effects of 5,4'-dihydroxy-3',5'- dimethoxy-7-O-β-D -glucopyranosyloxy-flavone on experimental hepatic injury 被引量:3
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作者 Dong-HuiXu Xue-TingMei +3 位作者 YingChen Yan-MeiLi Jun-YiLv Shi-BoXu 《World Journal of Gastroenterology》 SCIE CAS CSCD 2005年第12期1764-1768,共5页
AIM: To investigate the pharmacological effects of rice flavone (5,4'-dihydroxy-3',5'-dimethoxy-7-0-β-D-glucopyranosyloxy-flavone, RF) separated from panicle-differentiating to flowing rice on rat experim... AIM: To investigate the pharmacological effects of rice flavone (5,4'-dihydroxy-3',5'-dimethoxy-7-0-β-D-glucopyranosyloxy-flavone, RF) separated from panicle-differentiating to flowing rice on rat experimental hepatic injury. METHODS: Models of rat acute hepatic injury induced by carbon tetrachloride (CCl4) administration, rat hepatic fibrosis induced by thioacetamide, injury of primary cultured rat hepatocytes induced by CCl4, respectively, were established. After treated with RF, content of serum alanine transaminase (ALT), aspartate aminotransferase (AST) and albumin (Alb), hyaluronic acid (HA), the activity of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), and hydroxyproline (Hyp) were measured and liver tissue was observed pathologically by hematoxylin-eosin (HE) staining. Effects of RF on pathological changes, function index, enzyme of scavenging free radicals and blood rheology were evaluated. RESULTS: In model of rat acute hepatic injury induced by CCI4, RF can significantly decrease the contents of serum ALT, AST, increase the content of Alb, improve the dropsy and fat denaturalization of hepatocytes. In model of rat hepatic fibrosis induced by thioacetamide, RF can inhibit the increase of HA, Hyp and whole blood viscosity, and improve the activities of GSH-Px and SOD, and inauricular microcirculation. CONCLUSION: RF has apparent protective effects on hepatic injury by increasing activity of GSH-Px and SOD, scavenging free radicals produced by CCI4, reducing blood viscosity, and improving microcirculation and blood supply. 展开更多
关键词 5 4'-Dihydroxy-3' 5'-dimethoxy-7-0-β-D-glucopyranosyloxy-flavone Hepatic injury CCI4 free radicals Blood viscosity MICROCIRCULATION
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气象观测场在汽车试验场中的应用研究
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作者 陈海建 《时代汽车》 2024年第14期172-174,178,共4页
汽车试验场作为汽车开展道路测试的重要场所,用于验证汽车产品的品质以及可靠性。除了场地道路外,气象条件作为汽车道路测试的重要一环,在《GB/T12534-1990汽车道路试验方法通则》中也有明确要求,如:试验时应是无雨无雾天气,相对湿度小... 汽车试验场作为汽车开展道路测试的重要场所,用于验证汽车产品的品质以及可靠性。除了场地道路外,气象条件作为汽车道路测试的重要一环,在《GB/T12534-1990汽车道路试验方法通则》中也有明确要求,如:试验时应是无雨无雾天气,相对湿度小于95%,气温0-40℃,风速不大于3m/s。同时气象条件也作为试验场道路管控的重要依据,实时风速、雨量、能见度等信息为场地管理者发布限速、限行、封场等通知提供必要参考依据,直接影响道路测试安全管控的及时性。因此,文章从气象观测场的建设、气象服务、异常天气道路管控等方面开展气象观测场在汽车试验场中的应用研究。 展开更多
关键词 汽车试验场 气象服务 道路管控 products. In addition to the SITE roads METEOROLOGICAL conditions are an important part of AUTOMOTIVE ROAD testing and there are also clear requirements in the GB/T12534-1990 General Rules for AUTOMOTIVE ROAD Test Methods. For example the test should be conducted in rain and fog free weather with a relative humidity of less than 95% a temperature of 0-40 and a wind SPEED of no more than 3m/s. At the same time METEOROLOGICAL conditions also serve as an important basis for ROAD control in the test site. Real time information such as wind SPEED rainfall and visibility provides necessary reference for SITE managers to issue notices on SPEED limits SITE closures and traffic restrictions directly affecting the timeliness of ROAD testing safety control. Therefore this article conducts research on the application of METEOROLOGICAL observation SITES in AUTOMOTIVE testing SITES from the construction of METEOROLOGICAL observation SITES METEOROLOGICAL services and abnormal weather ROAD control.
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Free fatty acids, glucose, and insulin in type 2 diabetes mellitus 被引量:1
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作者 Rob NM Weijers 《World Journal of Diabetes》 SCIE 2022年第3期275-277,共3页
Xu et al used the HOMA2 model to estimate theβ-cell function and insulin resistance levels in an individual from simultaneously measured fasting plasma glucose and fasting plasma insulin levels.This method is based o... Xu et al used the HOMA2 model to estimate theβ-cell function and insulin resistance levels in an individual from simultaneously measured fasting plasma glucose and fasting plasma insulin levels.This method is based on the assumption that the glucose-insulin axis is central for the metabolic activities,which led to type 2 diabetes.However,significant downregulation of both the NKX2-1 gene and the TPD52L3 gene force an increase in the release of free fatty acids(FFAs)into the blood circulation,which leads to a marked reduction in membrane flexibility.These data favor a FFA-glucose-insulin axis.The authors are invited to extend their study with the introduction of the saturation index(number of carbon-carbon double bonds per 100 fatty-acyl chains),as observed in erythrocytes. 展开更多
关键词 free fatty acids Membrane flexibility NKX2-1 gene RNA sequencing Type 2 diabetes TPD52L-3 gene Unsaturation index
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Natural convection flow of a couple stress fluid between two vertical parallel plates with Hall and ion-slip effects 被引量:1
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作者 D.Srinivasacharya K.Kaladhar 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第1期41-50,共10页
The Hall and ion-slip effects on fully developed electrically conducting couple stress fluid flow between vertical parallel plates in the presence of a temperature dependent heat source are investigated. The governing... The Hall and ion-slip effects on fully developed electrically conducting couple stress fluid flow between vertical parallel plates in the presence of a temperature dependent heat source are investigated. The governing non-linear partial differential equations are transformed into a system of ordinary differential equations using similarity transformations. The resulting equations are then solved using the homotopy analysis method (HAM). The effects of the magnetic parameter, Hall parameter, ion-slip parameter and couple stress fluid parameter on velocity and temperature are discussed and shown graphically 展开更多
关键词 free convection Couple stress fluid Magneto- hydrodynamics Hall and ion-slip effects - HAM
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