— polygonal multiwall tubes
Heat transfer enhancement through inner grooved copper tubes with different tube parameters
... channels or tubes [26-28] The heat transfer increase and pressure drop in the helically grooved, horizontal micro-fin tubes were investigated by Wang et al [27] Many kinds of internally grooved tubes ... heat transfer correlation for inner grooved tubes Wang and Honda [20] evaluated the existing condensation heat transfer correlations for inner grooved tubes with their collected experimental heat ... correlations for inner grooved tubes Newell and Shah [18] reviewed the characteristic of two-phase heat transfer, pressure drop, and the effect of void fraction in inner grooved tubes Valladares [19]...
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hybrid metal oxide and multiwall carbon nanotube films for low temperature gas sensing
... carbon nanotubes are not revealed However, regardless the metal oxide employed, carbon nanotubes could be observed in a few regions of the films’ surface (see Fig 2) Therefore, carbon nanotubes are ... 400 ◦ C in air It is due to the low proportion of carbon nanotubes dispersed in the active layers (1/500 in wt.%) that most of the nanotubes are actually embedded within the metal oxide matrix 3.2 ... there is an optimum amount of carbon nanotubes to be added to each particular metal oxide in order to enhance responsiveness SEM analysis showed that the nanotubes survived the process of deposition...
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TORSION OF CIRCULAR SHAFTS AND TUBES
... as a set of concentric thin hollow tubes, all twisted by the same amount Figure 16.15 Torsion of a thin strip 386 Torsion of circular shafts and thin-walled tubes Consider such an elementaltube ... Torsion of thin-walled open sections 387 We ought to consider not rectangular elemental tubes but flat tubes with curved ends The contours of constant shearing stress are then continuous curves, ... of an angle section Torsion of circular shafts and thin-walled tubes 388 In the angle section of Figure 16.17, we take elemental tubes inside the two limbs of the section If t, and t2 are small...
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Báo cáo hóa học: " Superparamagnetic iron oxide nanoparticle attachment on array of micro test tubes and microbeakers formed on p-type silicon substrate for biosensor applications" pdf
... report fabrication of arrays of micro test tubes and microbeakers formed on p-type Si substrate with varying pore and particle sizes For the micro test tubes, the pore size as well as the inter-pore ... Figure 1c, d for synthesis of microbeakers and micro test tubes Based on the observations reported above we synthesized array of micro test tubes and microbeakers on p-Si substrate by suitably choosing ... micro test tubes (a) and (b) are the cross-sectional and top view respectively, showing substantial deposits of agglomerated particles Figure SEM images of SPION attached micro test tubes following...
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Báo cáo hóa học: " Rolled-up tubes and cantilevers by releasing SrRuO3-Pr0.7Ca0.3MnO3 nanomembranes" ppt
... SRO/PCMO/SRO microtubes (a) Rolled-up SRO/PCMO/SRO microtube with a diameter of 6.0 μm (b, c) Positioned microtubes obtained from -oriented trenches defined by optical lithography The tubes in (b) ... lithographically aligned tubes, using Page of the geometry of Malachias et al [18] Figure 4a (inset) shows the diffraction patterns of the flat film and an ensemble of rolled-up microtubes in the vicinity ... the tubes is clearly observed at the beginning of the trench, indicating a good rolling behavior Figure 2c shows a shorter tube section to better identify the tube on top of the mesa For tubes...
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Báo cáo hóa học: " NH4+ directed assembly of zinc oxide micro-tubes from nanoflakes" docx
... ZnSO4·7H2O 3.6:1.0 3.2:1.0 Micro -tubes Micro -tubes Micro -tubes Micro -tubes 2.8:1.0 Micro -tubes Micro -tubes 2.4:1.0 Micro -tubes Micro -tubes 2.0:1.0 Micro -tubes Micro -tubes 1.6:1.0 Irregular agglomerated ... in the absence of ZnO micro -tubes and under UV light illumination, or with the presence of ZnO micro -tubes and no UV illumination Results and discussion ZnO micro -tubes by self-assembled nanoparticles ... experiment with ZnO micro -tubes under UV irradiation All the reagents were of analytical grade and used as received without further purification Synthesis ZnO micro -tubes were synthesized by...
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Báo cáo hóa học: " Numerical evaluation of laminar heat transfer enhancement in nanofluid flow in coiled square tubes" pdf
... and the figure of merit for all tubes However, higher amounts of nanoparticles is not recommended In-plane spiral tubes give better performance than other coiled tubes for nanofluids Furthermore, ... thermo-physical properties-in coiled tubes filled with nanofluids; (iii) to study the heat performance of two different nanofluids, water-Al2O3 and water-CuO, in coiled tubes at various nanoparticle ... can be seen from Figure 5, temperatures in coiled tubes are higher than in straight tube at the same axial distance which indicates that coiled tubes have higher heat transfer rate when compared...
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Báo cáo hóa học: " Carbon composite micro- and nano-tubes-based electrodes for detection of nucleic acids" pot
... GmbH, Germany) and was 25°C [18] Abbreviations CVD: chemical vapour deposition; MWCNTs: multiwalled carbon nanotubes Acknowledgements The study was supported by the Czech grant projects GACR 102/09/P640, ... II electrode followed by nanocarbon electrode and microcarbon electrode Moreover, the carbon nanotubes for the electro-oxidation of DNA [13] The edge plane sites on graphite are generally accepted ... “nanocarbon”) was made of 60% “glassy carbon powder” (w/w, Sigma-Aldrich), 30% powdered cylinder carbon nanotubes (w/w, SigmaAldrich) and 10% mineral oil (w/w, Sigma-Aldrich) The third one was made of (called...
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Drawing of rods, wires and tubes Subjects of interest docx
... forming process, tubes are cold drawn using dies, plugs or mandrels to the required shape, size, tolerances and mechanical strength • provides good surface finishes Seamless stainless tubes/ pipes ... hardening • can produce tubes with thinner walls or smaller diameters than can be obtained from other hot forming methods • can produce more irregular shapes Copper and brass tubes Suranaree University ... Objectives • This chapter provides fundamental background on processes of drawing of rods, wires and tubes • Mathematical approaches for the calculation of drawing load will be introduced • Finally...
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Báo cáo lâm nghiệp: "Effect of shelter tubes on establishment and growth of Juniperus thurifera L. (Cupressaceae) seedlings in Mediterranean semi-arid environment" pot
... sylvestris (Mill.) Lehr [35] Moreover, the incidence on the seedlings protected by treeshelter tubes (Tubex®) was contrasted during the two years of field development Some authors affirm that ... containers of 250 cm3 (Arnabat) with an anti-spiralling system, during years Effects of shelters tubes on Juniperus thurifera L seedlings 719 2.3 Analysis of field performance In the trial zone, ... 2001–Sept 2002, collected in the meteorological station located in the trial zone Effects of shelters tubes on Juniperus thurifera L seedlings 721 Figure Absolute maximum and minimum temperatures inside...
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Báo cáo y học: "A prospective study of tracheopulmonary complications associated with the placement of narrow-bore enteral feeding tubes" doc
... soft tubes is outweighed by a decrease in mechanical complications associated with large-bore tubes Our study confirms the risk of inadvertent tracheopulmonary insertion of enteral feeding tubes ... feeding tubes Arch Intern Med 1989, 149:184-188 Valentine RJ, Turner WW: Pleural complications of nasoenteric feeding tubes JPEN 1985, 9:605-607 Lipman TO: Nasopulmonary intubation with feeding tubes ... measuring the pH of aspirated fluid Small-bore feeding tubes were introduced to decrease mechanical complications associated with stiffer, largebore tubes, such as ulceration and bleeding from the nose,...
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Báo cáo khoa học: "Endotracheal tubes and imposed work of breathing: what should we do about it, if anything" pps
... [6] evaluated flow–volume loops in 18 postoperative patients intubated with size 7.0 and 8.0 ET tubes and found that only ‘minimal limitation to airflow’ occurred at volumes and frequencies associated ... Wilson RK, Casar G, Bloom K, Teague RB: Work of breathing through different sized endotracheal tubes Crit Care Med 1986, 14:1028-1031 Brochard L, Rua F, Lorino H, Lemaire F, Harf A: Inspiratory ... 107:204-209 Weissman C: Flow–volume relationships during spontaneous breathing through endotracheal tubes Crit Care Med 1992, 20:615-620 Banner MJ, Blanch PB, Kirby RR: Imposed work of breathing and...
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Báo cáo y học: "A new technique for bedside placement of enteral feeding tubes: a prospective cohort study" pps
... rate of 78% with spiral nasojejunal tubes compared with a rate of 14% with straight tubes, however, with a very low rate of correct positions [23] Self-advancing tubes are an interesting alternative ... physician to place jejunal feeding tubes transnasally independent of a special endoscopy team Transnasal endoscopy for the placement of postpyloric feeding tubes has already been described It ... to place the feeding tubes without endoscopic guidance These procedures require a certain degree of gastric emptying Blind advancement of lubricated postpyloric feeding tubes with clockwise rotation...
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commentary on standard practice for design and construction of concrete silos and stacking tubes for storing gran
... REPORT R4.3—Details and placement of reinforcement R4.4—Loads R4.5—Wall design R4.6—Hopper design R4.7—Column design R4.8—Foundation design Chapter 5—Stave silos, p 313R-13 R5.1—Notation R5.4—Erection ... tolerances R5.5—Wall design R5.6—Hoops for stave silos R5.7—Concrete stave testing Chapter 6—Post-tensioned silos, p 313R-16 R6.1—Notation R6.2—Scope R6.4—Tendon systems R6.5—Bonded tendons R6.6—Unbonded ... tendons R6.7—Post-tensioning ducts R6.8—Wrapped systems R6.12—Design R6.13—Vertical bending moment and shear due to post-tensioning R6.14—Tolerances Chapter 7—Stacking tubes, p 313R-18 R7.2—General...
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standard practice for design and construction of concrete silos and stacking tubes for storing granular materials
... post-tensioning 6.14—Tolerances Chapter 7—Stacking tubes, p 313-16 7.1—Scope 7.2—General layout 7.3—Loads 7.4—Load combinations 7.5—Tube wall design 7.6—Foundation or reclaim tunnel Chapter 8—Specified ... 5.7—Concrete stave testing Chapter 6—Post-tensioned concrete silos, p 313-12 6.1—Notation 6.2—Scope 6.3—Post-tensioning systems 6.4—Tendon systems 6.5—Bonded tendons 6.6—Unbonded tendons 6.7—Post-tensioning ... 4.6—Hopper design 4.7—Column design 4.8—Foundation design Chapter 5—Concrete stave industrial silos, p 313-10 5.1—Notation 5.2—Scope 5.3—Coatings 5.4—Erection tolerances 5.5—Wall design 5.6—Hoops for stave...
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Global gene expression analysis of cranial neural tubes in embryos of diabetic mice
... hypoxia in the developing cranial neural tubes …… 16 2.3.1 Glycolysis pathway…………………………………………………….…17 2.3.2 Hypoxia in the developing cranial neural tubes ………………….…….18 2.3.2.1 Hypoxia-inducible ... hypoxia in cranial neural tubes of mouse embryos…………………………………………………………… 95 3.1 Maternal diabetes altered the expression of genes involved in glycolysis in cranial neural tubes of mouse embryos………………………………………… ... respond to hypoxia in cranial neural tubes of mouse embryos………………………………………… 96 3.2.1 Expression of hypoxia-inducible factor 1α (Hif-1α) in cranial neural tubes of embryos from control and diabetic...
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Approximating polygonal objects with deformable smooth surfaces
... Approximating Polygonal Object with a Union of Balls 27 4.1 Polygonal Objects 27 4.2 Approximating a Polygonal Object with Union of Balls 28 Approximating Polygonal Object ... Approximating Polygonal Object with a Union of Balls In this chapter we present our method in approximating a polygonal object with a union of balls First, we define what we mean by polygonal object ... in [2] is to convert a polygonal object into a skin surface We can view our work here as achieving this goal and the purpose of doing so is to perform deformation between polygonal objects As noted...
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Numerical studies on physiological pulsatile flow through stenotic tubes
... PHYSIOLOGICAL PULSATILE FLOW THROUGH STENOTIC TUBES LIU XI NATIONAL UNIVERSITY OF SINGAPORE 2007 NUMERICAL STUDIES ON PHYSIOLOGICAL PULSATILE FLOW THROUGH STENOTIC TUBES LIU XI (B.S., USTC) A THESIS SUBMITTED ... studies have been carried out for physiological waveform pulsatile flow through double stenosed tubes with various Reynolds number and Womersley number and different geometry configurations by ... state-of-the-art literature survey has been carried out to review flows through the stenosed circular tubes and the related numerical simulation methods 2.1 Steady Flows in Constricted Tube A large...
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Tìm thêm: hệ việt nam nhật bản và sức hấp dẫn của tiếng nhật tại việt nam xác định các mục tiêu của chương trình xác định các nguyên tắc biên soạn khảo sát các chuẩn giảng dạy tiếng nhật từ góc độ lí thuyết và thực tiễn khảo sát chương trình đào tạo của các đơn vị đào tạo tại nhật bản khảo sát chương trình đào tạo gắn với các giáo trình cụ thể xác định thời lượng học về mặt lí thuyết và thực tế tiến hành xây dựng chương trình đào tạo dành cho đối tượng không chuyên ngữ tại việt nam khảo sát các chương trình đào tạo theo những bộ giáo trình tiêu biểu nội dung cụ thể cho từng kĩ năng ở từng cấp độ xác định mức độ đáp ứng về văn hoá và chuyên môn trong ct mở máy động cơ lồng sóc hệ số công suất cosp fi p2 đặc tuyến hiệu suất h fi p2 đặc tuyến mômen quay m fi p2 đặc tuyến tốc độ rôto n fi p2 đặc tuyến dòng điện stato i1 fi p2 động cơ điện không đồng bộ một pha sự cần thiết phải đầu tư xây dựng nhà máy phần 3 giới thiệu nguyên liệu