Banach空间中伪压缩映射的粘滞逼近方法

结合增生算子零点逼近问题,提出Banach空间中伪压缩映射的一个粘滞逼近方法。引入了新的迭代序列,并证明所构造的迭代序列强收敛于伪压缩映射的不动点。     

铜仁低山丘陵区质地粘重稻田油菜免耕直播限制性因子分析

通过分析铜仁地区低山丘陵区的气候条件、自然灾害、土壤条件的变化规律,找到影响粘质稻田油菜免耕直播的限制性因子,为进一步提高土地利用率、推广轻型简化油菜栽培方式奠定基础。     

旋转球体法测粘滞系数的方法研究

在旋转圆柱法测定液体粘滞系数的基础上，提出一种旋转球体法测定液体粘滞系数的测量方法。     

INFLUENCE OF SOLVENT AND POLYMER SORT ON ANOMALOUS RHEOLOGICAL BEHAVIOR OF POLYMER SOLUTION AT HIGH DILUTION

ＩＮＴＲＯＤＵＣＴＩＯＮＰｏｌｙｍｅｒｓｉｎｍｅｄｉｕｍａｔｈｉｇｈｄｉｌｕｔｉｏｎｈａｖｅａｂｒｏａｄｒａｎｇｅｏｆａｐｐｌｉｃａｔｉｏｎｓｎｏｗａｄａｙｓ.Ｔｈｅｙｗｅｒｅｕｓｅｄａｓｐｏｕｒｐｏｉｎｔｄｅｐｒｅｓｓａｎｔａｎｄｖｉｓｃｏｓｉｔｙｒｅ ｄｕｃｅｒｏｆｃｒｕｄｅｏｉｌａｎｄｉｔｓｐｒｏｄｕｃｔｓｓｕｃｈａｓＥＶＡａｎｄｉｔｓｄｅｒｉｖａｔｉｖｅｓ(ＳｕｎｉｌＫｕｍｅｒ,1 989;Ｑｉａｎｅｔａｌ.,1 996;Ｑｉａｎｅｔａｌ.,1 996;Ｑｉｅｔａｌ.,1 992 ) ;ｄｒａｇｒｅｄｕｃｅｒｏｆｗａｔｅｒ…     

CCD落球法液体粘滞系数测定仪

介绍了一种CCD落球法液体粘滞系数测定仪.在垂直放置且注入待测液体的圆柱形透明缸体内悬挂一个用以标定小球下落位置的直尺,图像采集系统对准圆柱形透明缸体的下部,把采集的小球下落过程和直尺的图像传送给计算机,在计算机的显示器上采用网格法或十字坐标法对小球下落过程的每一采样位置与直尺进行比较计算,求得小球的收尾速度并由此算出待测液体的粘滞系数.     

Mechanochemical degradation of potato starch paste under ultrasonic irradiation

1 Introduction a As the most abundant reserve polysaccharide in plants, starch consists of a mixture of two α-glucans. Amylose and amylopectin are two macromolecular components of starch granules. Amylose, a poly (1-4)-α-D-glucan, is essentially linear …     

On the structural features of fiber suspensions in converging channel flow

INTRODUCTIONModelingfiber fiberinteractionsinnon di lutefibersuspensionsanddescribinghowtheseinteractionsaffecttherheologicalpropertiesofthesuspensionsintheflowsarefundamentalandimportantinmulti phaseflowsresearch .Ulti matelywewouldliketobeabletodesignan…     

Influence of solvent and polymer sort on anomalous rheological behavior of polymer solution at high dilution

The rheological behavior of polyvinyl acetate (PVAc) in N,N′=dimethylformamide (DMF), methyl ethyl ketone (MEK), 1,2-dichloroethane (DCE), tetrahydrofuran (THF) and toluene (TOL), polystyrene (PS) in DMF, MEK, DCE, THF and cyclohexane (CYH), and random ethylene-vinyl acetate (EVA) copolymer in DCE, TOL, CYH with and without surfactant of Span80 and in the DCE/CYH solvent mixtures with surfactant of Span80 was examined at high dilution. It was shown that the extent and type of the upsweep or downsweep (anomalous rheological behavior) of the reduced viscosity-concentration curves of these different polymers at high dilution are markedly dependent on the dielectric constant of the solvent and the polarity of the polymer used. The experimental results indicated that the anomalous rheological behavior of EVA copolymer, widely used as a flow improver, is related to its efficiency in reducing viscosity and depressing pour point of crude oil and waxy solvents. Project (No.29774020) suppored by the Natural Science Foundation of China(NSFC).     

The acute effects of resistance exercise on the main determinants of blood rheology

The aim of this study was to examine short-term changes in blood rheological variables after a single bout of resistance exercise. Twenty-one healthy males completed three sets of 5?–?7 repetitions of six exercises at an intensity corresponding to 80% of one-repetition maximum (1-RM). The average duration of the exercise bout was 35?min. Venous blood samples were obtained before exercise, immediately after exercise and after 30?min of recovery and analysed for lactate, red blood cell count, haematocrit, haemoglobin, plasma viscosity, fibrinogen, total protein and albumin concentration. Plasma volume decreased 10.1% following resistance exercise. This occurred in parallel with an increase of 5.6%, 5.4% and 6.2% in red blood cell count, haemoglobin and haematocrit; respectively. Plasma viscosity increased from 1.55?±?0.01 to 1.64?±?0.01 mPa?·?s immediately after resistance exercise before decreasing to 1.57?±?0.01 mPa?·?s at the end of the recovery period. Similarly, fibrinogen, albumin and total protein increased significantly following resistance exercise. However, the rises in all these rheological parameters were transient and returned to pre-exercise values by the end of recovery. We conclude that a single session of heavy resistance exercise performed by normal healthy individuals alters blood rheological variables and that these changes are transient and could be attributed to exercise-induced haemoconcentration.     

浅析杏花矿主井提升机减速机润滑油粘-温特性

介绍提升机在超设计能力和长时间运行下,润滑油的温特性及控制方法。