Study of the Relationship between the Structural Parameters of Magnetic Polypropylene-Knitted Fabric and Human Skin Microcirculation

In this paper, the effects of the structural parameters of magnetic-knitted fabric on human skin microcirculation (HSM) were studied in relation to magnetic polypropylene yarn, which was used as raw material. Three experimental factors were designed: the magnetic powder content of polypropylene, the feeding ratio of magnetic polypropylene (MP) and graphene viscous (GV), and stitch. Twelve pieces of seamless knitted fabric were prepared according to the comprehensive experimental design method. The BIV angiography was used to proceed with an HSM test of about 12 pieces of seamless knitted fabric. The results show the following: The magnetic powder content of polypropylene has the greatest influence on the blood flow promotion multiples of skin–blood microcirculation, followed by the feeding ratio of MP and GV, while stitch has the least influence. When the plating yarn feeding ratio was 100:0, the magnetic powder content of polypropylene was 50%, and the stitch was 1 + 1 false rib, meaning that the fabric could promote HSM more efficiently. This is compared against the common polypropylene knitted fabric, where the blood flow promotion multiples increased by 9.87%. The purpose of this study was to explore the structural parameters of magnetic polypropylene-knitted fabric that has a better effect on promoting HSM, and to provide a reference for the development of functional health-knitted fabrics.

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Knitting parameters effect of coffee carbon polyamide and graphene polyamide far-infrared knits on human skin microcirculation

Journal of Engineered Fibers and Fabrics ◽

10.1177/15589250211014182 ◽

2021 ◽

Vol 16 ◽

pp. 155892502110141

Author(s):

Zimin Jin ◽

Jiaxue Chen ◽

Jing Jin ◽

Liping Zhu ◽

Mingtao Zhao ◽

...

Keyword(s):

Human Skin ◽

Design Method ◽

Blood Perfusion ◽

Far Infrared ◽

Test Method ◽

Functional Health ◽

Skin Microcirculation ◽

Promoting Effect ◽

Knitted Fabrics ◽

Market Needs

In this paper, the effect of coffee carbon and graphene far-infrared polyamide knitted fabrics on blood perfusion were studied based on the test method of human skin microcirculation (HSM), starting from the plating yarn feeding ratio and stitch of seamless knitted fabrics. Set the face yarn feeding ratios of coffee carbon polyamide (CCP) and graphene polyamide (GP) as 100:0, 75:25, 50:50, and 25:75. The stitches were 1 + 3 rib, 1 + 1 false rib, and plain plating. Both the plating yarn feeding ratio and stitch were designed as two experimental factors. According to the comprehensive experimental design method, 12 seamless knitted fabrics were prepared. The HSM was tested by BVI Projection Vein Finder. According to the orthogonal analysis method: Factor A, the plating yarn feeding ratio has the greatest effect on HSM, the second was factor B. When the plating yarn feeding ratio was 75:25, the stitch was 1 + 3 rib, the fabric has an excellent promoting effect on HSM. The purpose of this study was to explore the process parameters of far-infrared seamless knitted fabrics that have a better promotion effect on HSM, to apply the process to develop functional health care clothing to meet people’s market needs.

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Phase-resolved optical coherence tomography and optical Doppler tomography for imaging blood flow in human skin with fast scanning speed and high velocity sensitivity

Optics Letters ◽

10.1364/ol.25.000114 ◽

2000 ◽

Vol 25 (2) ◽

pp. 114 ◽

Cited By ~ 447

Author(s):

Yonghua Zhao ◽

Zhongping Chen ◽

Christopher Saxer ◽

Shaohua Xiang ◽

Johannes F. de Boer ◽

...

Keyword(s):

Blood Flow ◽

Optical Coherence Tomography ◽

Human Skin ◽

High Velocity ◽

Scanning Speed ◽

Optical Coherence ◽

Doppler Tomography ◽

Velocity Sensitivity ◽

Optical Doppler Tomography

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Blood Vessel Density Measured Using Dynamic Optical Coherence Tomography is a Tool for Wound Healers

The International Journal of Lower Extremity Wounds ◽

10.1177/15347346211017334 ◽

2021 ◽

pp. 153473462110173

Author(s):

Rajgopal Mani ◽

Jon Holmes ◽

Kittipan Rerkasem ◽

Nikolaos Papanas

Keyword(s):

Blood Flow ◽

Optical Coherence Tomography ◽

Blood Vessel ◽

Chronic Wounds ◽

Vessel Density ◽

Optical Coherence ◽

Skin Microcirculation ◽

Wound Edge ◽

Venous Ulcers ◽

Oct Imaging

Dynamic optical coherence tomography (D-OCT) is a relatively new technique that may be used to study the substructures in the retina, in the skin and its microcirculation. Furthermore, D-OCT is a validated method of imaging blood flow in skin microcirculation. The skin around venous and mixed arterio-venous ulcers was imaged and found to have tortuous vessels assumed to be angiogenic sprouts, and classified as dots, blobs, coils, clumps, lines, and curves. When these images were analyzed and measurements of vessel density were made, it was observed that the prevalence of coils and clumps in wound borders was significantly greater compared with those at wound centers. This reinforced the belief of inward growth of vessels from wound edge toward wound center which, in turn, reposed confidence in following the wound edge to study healing. D-OCT imaging permits the structure and the function of the microcirculation to be imaged, and vessel density measured. This offers a new vista of skin microcirculation and using it, to better understand angiogenesis in chronic wounds.

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Pharmacology of the human skin microcirculation

Microvascular Research ◽

10.1016/j.mvr.2010.03.005 ◽

2010 ◽

Vol 80 (1) ◽

pp. 1 ◽

Cited By ~ 3

Author(s):

Jean-Luc Cracowski ◽

Matthieu Roustit

Keyword(s):

Human Skin ◽

Skin Microcirculation

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787The influence of age, gender, site and sun exposure on human skin thickness, blood flow and content

Radiotherapy and Oncology ◽

10.1016/s0167-8140(96)80796-1 ◽

1996 ◽

Vol 40 ◽

pp. S200 ◽

Cited By ~ 1

Author(s):

P. Simonen ◽

C. Hamilton ◽

P. O'Brien ◽

J. Denham

Keyword(s):

Blood Flow ◽

Human Skin ◽

Sun Exposure ◽

Skin Thickness

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Multivariate design and analysis of aircraft HEX under multiple working conditions within flight envelope

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4052342 ◽

2021 ◽

pp. 1-18

Author(s):

Qihang Liu ◽

G.Q. Xu ◽

Jie Wen ◽

Yanchen Fu ◽

Laihe Zhuang ◽

...

Keyword(s):

Heat Transfer ◽

Working Conditions ◽

Design Method ◽

Structural Parameters ◽

Optimal Structure ◽

Clear Correlation ◽

Pressure Drops ◽

Design Variables ◽

Wide Range ◽

Common Weight

Abstract This paper presents a multi-condition design method for the aircraft heat exchanger (HEX), marking with light weight, compactness and wide range of working conditions. The quasi-traversal genetic algorithm (QT-GA) method is introduced to obtain the optimal values of five structural parameters including the height, the tube diameter, the tube pitch, and the tube rows. The QT-GA method solves the deficiency of the conventional GA in the convergence, and gives a clear correlation between design variables and outputs. Pressure drops, heat transfer and the weight of the HEX are combined in a single objective function of GA in the HEX design, thus the optimal structure of the HEX suitable for all the working conditions can be directly obtained. After optimization, the weight of the HEX is reduced to 2.250 kg, more than 20% lower than a common weight of around 3 kg. Based on the optimal structure, the off-design performance of the HEX is further analyzed. Results show that the extreme working conditions for the heat transfer and the pressure drops are not consistent. It proves the advance of the multi-condition design method over traditional single-condition design method. In general, the proposed QT-GA design method is an efficient way to solve the multi-condition problems related to the aircraft HEX or other energy systems.

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Research on Simulation Test of Coal Similar Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.850-851.847 ◽

2013 ◽

Vol 850-851 ◽

pp. 847-850 ◽

Cited By ~ 2

Author(s):

Lin Chao Dai

Keyword(s):

Compressive Strength ◽

Raw Materials ◽

Similarity Theory ◽

Design Method ◽

Uniform Design ◽

Physical And Mechanical Properties ◽

Raw Material ◽

Similar Material ◽

Cement Ratio ◽

Water Cement Ratio

In order to study the coal and gas outburst similar simulation experiment, coal similar material was made up based on the similarity theory. Based on the previous similar material study, the cement, sand, water, activated carbon and coal powder was selected as the raw material of similar material. Meanwhile similar material matching program with 5 factors and 6 levels was designed by using Uniform Design Method. And the physical and mechanical properties of the similar material compressive strength was measured under different proportions circumstances. The relationship between similar material and the raw materials was analyzed. The results show that choosing different materials can compound different similar materials with different requirements. And the water-cement ratio plays a decisive influence on the compressive strength of similar material. The compressive strength of similar material decreases linearly when the water-cement ratio increases.

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