A microfluidic device approach to generate hollow alginate microfibers with controlled wall thickness and inner diameter

2015 ◽  
Vol 117 (21) ◽  
pp. 214703 ◽  
Author(s):  
Uyen H. T. Pham ◽  
Madiha Hanif ◽  
Amit Asthana ◽  
Samir M. Iqbal
Keyword(s):  
Microfluidic Device ◽  
Wall Thickness ◽  
Inner Diameter ◽  
Alginate Microfibers

Equidirectional Umbrella Diameter Changing Mechanism for Ultrasonic Inspection of Seabed Pipelines

2010 ◽  
Vol 163-167 ◽  
pp. 2927-2933
Author(s):  
Chong Zhen Cao ◽  
Feng Qin Wang ◽  
Qi Fa Tian ◽  
Jia Lan Zhuang ◽  
Feng Chun Li
Keyword(s):  
Wall Thickness ◽  
Ultrasonic Inspection ◽  
Machine Experiment ◽  
Oil Pipelines ◽  
Inner Diameter

Ultrasonic inspection is a key method of inspecting wall thickness flaw of seabed oil pipelines. How to lay out ultrasonic probes to fit for three inner diameter pipelines of Φ195mm, Φ247mm and Φ297mm was analyzed detailed. Diameter changing principle feasibility of ultrasonic inspection adopting 10 parallelogram mechanisms was discussed, and the key parts of structure of equidirection umbrella diameter changing mechanism were analyzed. In the end model machine experiment verified that equidirection umbrella diameter changing technology is feasible.

Fabrication of NiO Nanorings by Bubble-Bursting Bubbles as Templates

2013 ◽  
Vol 464 ◽  
pp. 54-57
Author(s):  
Yun Feng Guo ◽  
Zhi Hua Feng ◽  
Zhi Hao Yuan
Keyword(s):  
Growth Mechanism ◽  
Wall Thickness ◽  
Low Cost ◽  
Heat Treating ◽  
Wire Diameter ◽  
Bubble Bursting ◽  
Inner Diameter ◽  
Average Wall Thickness ◽  
20 Nm

A simple and low-cost method based on a heat-treating of Ni (NO3)2/SiO2film has been developed for fabricating NiO nanorings. The as-prepared nanorings have an inner diameter of 150-250nm and an average wall thickness (namely wire diameter) of approximately 20 nm on the surface of SiO2matrix. Furthermore, a growth mechanism, namely bubble-bursting bubbles as templates was tentatively proposed for understanding the formation of the NiO nanorings.

Structural characterization of the fullerene nanotubes prepared by the liquid–liquid interfacial precipitation method

2005 ◽  
Vol 20 (3) ◽  
pp. 688-695 ◽  
Author(s):  
Kun'ichi Miyazawa ◽  
Jun-ichi Minato ◽  
Tetsuro Yoshii ◽  
Masahisa Fujino ◽  
Tadatomo Suga
Keyword(s):  
Linear Relationship ◽  
Wall Thickness ◽  
Structural Characterization ◽  
Tube Wall ◽  
Precipitation Method ◽  
Outer Diameter ◽  
Tubular Structures ◽  
Growth Axis ◽  
Inner Diameter

Fine tubular fibers composed of C60 and C70 fullerene molecules were successfully fabricated by the liquid–liquid interfacial precipitation method. The walls of the tubular fibers were crystalline, and the fullerene molecules were densely packed along the growth axis of tube wall. The tubular structures are called “fullerene nanotubes.” The inner diameter and the outer diameter of C70 tubes showed a linear relationship, suggesting a constant wall thickness of the tubes. The tubular structures composed of C70 molecules could be formed when their diameter was larger than about 240 nm. The fullerene tubes were successfully fabricated by using a C60-C70 soot as well. The formation of fullerene nanotubes can be understood by assuming a mechanism of core dissolution of the solvated fullerene nanowhiskers.

Remote Measurement of the Pipe Thickness Reduction by Microwaves

2007 ◽  
Author(s):  
Yang Ju
Keyword(s):  
Resonance Frequency ◽  
Wall Thickness ◽  
Large Scale ◽  
Microwave Signal ◽  
Thickness Reduction ◽  
Remote Measurement ◽  
Copper Pipe ◽  
Inner Diameter

A method which can inspect a pipe in a large scale and measure the thickness reduction remotely was demonstrated. A copper pipe having 17 mm inner diameter, 1 mm wall thickness, and 900 mm length was measured. The thickness reduction having the value from 10% to 80% of the wall thickness was detected significantly. By building up a resonance for the microwave signal propagated in the pipe, it is possible to determine the thickness reduction using the measured resonance frequency.

State Analysis on the Main Components of Reformer Furnace Pipe Used for a Design Cycle

2012 ◽  
Vol 550-553 ◽  
pp. 3121-3124
Author(s):  
Li Feng Ma ◽  
Xiao Fei Ding ◽  
Jun Zhang ◽  
Mao Kai Tian ◽  
Li Jing Gong
Keyword(s):  
Wall Thickness ◽  
Element Distribution ◽  
Lower Grade ◽  
Riser Pipe ◽  
Service Period ◽  
Design Cycle ◽  
Inner Diameter ◽  
Grade Material ◽  
Main Components ◽  
State Analysis

Comprehensive state analysis and life evaluation of the main components of reformer furnace run over service period by EPMA, microstructure and high temperature rupture property. The results show that element distribution and microstructure of reformer pipe, riser pipe, low collecting pipe and socket is normal and the remaining life is longer. The material of furnace pipe for the HK40 are able to meet the process requirement, but the wall thickness of reformer pipe is too large, affecting the thermal efficiency and the inner diameter is small to limit the catalyst and flow. It is good proposal to production enterprises that higher level of material such as ZG50Ni35Cr25NbM is selected to reduce the wall thickness properly, expand the diameter and improve efficiency. Similarly, it can also be appropriate for the riser pipe to choose a lower grade material and reduce the wall thickness and save cost.

Measurement of inner diameter and wall thickness for micro-capillary by digital holographic tomography

2013 ◽  
Vol 21 (7) ◽  
pp. 1643-1650 ◽  
Author(s):  
潘哲朗 PAN Zhe-lang ◽  
李仕萍 LI Shi-ping ◽  
钟金钢 ZHONG Jin-gang
Keyword(s):  
Wall Thickness ◽  
Inner Diameter

scholarly journals Cross-sectional analysis of tubular polymer semi-finished products using ultrasound in comparison with other measuring methods

2020 ◽  
Vol 6 (3) ◽  
pp. 151-154
Author(s):  
Olga Sahmel ◽  
Stefan Siewert ◽  
Wolfram Schmidt ◽  
Klaus-Peter Schmitz ◽  
Niels Grabow
Keyword(s):  
Wall Thickness ◽  
Biomedical Engineering ◽  
Measuring Method ◽  
Outer Diameter ◽  
Micro Computed Tomography ◽  
Cross Sectional ◽  
Biodegradable Poly ◽  
Ultrasonic Measuring ◽  
Inner Diameter ◽  
Sectional Analysis

AbstractIn the sector of biomedical engineering and implant technology, high-precision geometry is often decisive for successful end product functionalization. Especially in the production of tubular polymer semi-finished products, e.g. for stent fabrication, it is important to assure the desired parameters, such as inner and outer diameter and wall thickness. Within the current study we analyzed semifinished products for manufacturing of polymeric stents using three different methods. Biodegradable poly-L-lactide (PLLA) tubes were examined by means of micro computed tomography, ultrasonic scanning and scanning electron microscopy. The final evaluation presents clear advantages of the ultrasonic measuring method for the measurement of outer and inner diameter and wall thickness.

Hoop Stress Analysis of High Grade Heavy Wall Thickness Pipe in Hydrostatic Test

2011 ◽  
Vol 287-290 ◽  
pp. 2826-2829
Author(s):  
Yan Hua Yang ◽  
Zhuan Zhao Yang ◽  
Xing Liang Liu ◽  
Hao Xue Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hydrostatic Pressure ◽  
Theoretical Calculation ◽  
Wall Thickness ◽  
Hoop Stress ◽  
Stress Gradient ◽  
Line Pipe ◽  
Inner Diameter ◽  
Element Method

The distribution of hoop stress calculated and simulated by Finite Element Method and theoretical calculation in this paper, when the hydrostatic pressure was carried out on the line pipe of Φ 762mm×31.8 mm API SPEC 5L[1] X70 longitudinal seams submerged arc welding(LSAW). The results of simulated by Finite Element Method were accord well with that of theoretical calculation, both of them shown that the hoop stress deviation between pipe inside surface and outside surface was nearly 40MPa, which was about 9% of the hoop stress of outside surface. Besides, the influence of the D/t(diameter-thickness ratio)on the hoop stress were also researched, which shown that the larger the value of D/t was , the fewer that influence on the hoop stress, when D/t=200, the deviation was less than 1%; Or else, the D/t may cause a great stress gradient in the direction of the thickness, even when the D/t=42, the deviation was up to 5%. So that, the effect of the d/t should be taken into account when calculating the hoop stress of pipe with D/t≤42. In other word, a new hydrostatic pressure formula for the heavy wall thickness pipe( D/t≤42) was put forward and adopted when calculating its hydrostatic pressure, that was P =c* Sh (Do2 - Di2) / (Do2 + Di2), where, c, specification coefficient; Sh, hoop stress; Do, outside diameter; Di, inner diameter.

scholarly journals A New Method for Precision Measurement of Wall-Thickness of Thin-Walled Spherical Shell Parts

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 467
Author(s):  
Jiang Guo ◽  
Yongbo Xu ◽  
Bo Pan ◽  
Juntao Zhang ◽  
Renke Kang ◽  
...  
Keyword(s):  
Spherical Shell ◽  
Wall Thickness ◽  
High Surface ◽  
Measurement Data ◽  
Outer Diameter ◽  
Surface Errors ◽  
Inner Diameter ◽  
Thickness Error ◽  
Thin Walled ◽  
Physics Experiments

Thin-walled parts are widely used in shock wave and detonation physics experiments, which require high surface accuracy and equal thickness. In order to obtain the wall thickness of thin-walled spherical shell parts accurately, a new measurement method is proposed. The trajectories, including meridian and concentric trajectories, are employed to measure the thickness of thin-walled spherical shell parts. The measurement data of the inner and outer surfaces are unified in the same coordinate system, and the thickness is obtained based on a reconstruction model. The meridian and concentric circles’ trajectories are used for measuring a spherical shell with an outer diameter of Φ210.6 mm and an inner diameter of Φ206.4 mm. Without the data in the top area, the surface errors of the outer and inner surfaces are about 5 μm and 6 μm, respectively, and the wall-thickness error is about 8 μm with the meridian trajectory.

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