The relationship between dermal papillary structure and skin surface properties, color, and elasticity

2015 ◽  
Vol 22 (3) ◽  
pp. 295-304 ◽  
Author(s):  
K. Mizukoshi ◽  
T. Nakamura ◽  
A. Oba
Keyword(s):  
Surface Properties ◽  
Skin Surface ◽  
Papillary Structure ◽  
The Relationship

ANALYSIS OF THE INFLUENCE OF DIMENSIONS OF THE ROPE MIDWATER TRAWLS ON THEIR PERFORMANCE SUBJECT TO GEOMETRIC PROPERTIES OF CONE SHELLS

2017 ◽  
pp. 25-33
Author(s):  
Alexander Vasilievich Dvernik
Keyword(s):  
Surface Properties ◽  
Conical Shell ◽  
Side Surface ◽  
Theoretic Analysis ◽  
Good Convergence ◽  
Large Size ◽  
Quality Coefficient ◽  
Geometric Quality ◽  
The Relationship ◽  
Parameters Calculation

The article studies different shell constructions of mid-water trawls and their properties. The problem settled is suggested to be solved taking into account real geometric interrelations between spacious and surface properties of cone shells. The author suggests to accept a so-called geometric quality coefficient as a criterion of the properties of a conical shell, which represents the ratio of the shell to the area of its side surface and by analogy to use it to the shell of the trawl. The relationship between the trawl dimensions and geometric quality coefficient have been studied. Comparing these figures with the actual characteristics of trawls showed good convergence. According to the results of theoretic analysis and parameters calculation, trawl large-size shells will always have advantages in geometric characteristics over mid-size and, especially, small-size shells. The results of the analysis can be used for approximate calculations of the parameters of the trawl and justification of ways to improve the performance of existing mid-water trawls.

Investigation of the relationship between skin-emitted volatile fatty acids and skin surface acidity in healthy participants—a pilot study

2021 ◽  
Vol 15 (3) ◽  
pp. 037101
Author(s):  
Tasneem Shetewi ◽  
Melissa Finnegan ◽  
Shane Fitzgerald ◽  
Shuai Xu ◽  
Emer Duffy ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Pilot Study ◽  
Volatile Fatty Acids ◽  
Surface Acidity ◽  
Skin Surface ◽  
The Relationship ◽  
Healthy Participants

Investigation on the recycling of sulfuric acid from pretreatment of cellulose for nanocellulose preparation

TAPPI Journal ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 103-111
Author(s):  
CHAOYU DUAN ◽  
YANGYANG PENG ◽  
SHIYU FU ◽  
LUCIAN LUCIA
Keyword(s):  
Thermal Stability ◽  
Sulfuric Acid ◽  
Zeta Potential ◽  
Surface Properties ◽  
Value Chain ◽  
Solid Residue ◽  
Number Of Cycles ◽  
The Relationship

Sulfuric acid is often used to pretreat cellulose prior to homogenization and conversion to nanocellulose. It would be economically significant to reuse the acid to close the overall value chain loop. The target of this work was to investigate the effect of recovery and recycling frequency of sulfuric acid from the pretreatments on the pretreatment yield of water-insoluble cellulose solid residue, and to explore the relationship between the nanocellulose size prepared by recovery of acid and number of cycles. The surface properties of the nanocelluloses were measured, including content of sulfate groups, absolute zeta potential, crystallinity, and thermal stability.

Procedure to Estimate Thermophysical and Geometrical Parameters of Embedded Cancerous Lesions Using Thermography

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Jose Manuel Luna ◽  
Ricardo Romero-Mendez ◽  
Abel Hernandez-Guerrero ◽  
Francisco Elizalde-Blancas
Keyword(s):  
Research Work ◽  
Blood Perfusion ◽  
Skin Surface ◽  
Geometrical Parameters ◽  
Estimation Of Parameters ◽  
Perfusion Rate ◽  
Unknown Parameters ◽  
Cancerous Lesions ◽  
The Relationship ◽  
Inverse Procedure

Based on the fact that malignant cancerous lesions (neoplasms) develop high metabolism and use more blood supply than normal tissue, infrared thermography (IR) has become a reliable clinical technique used to indicate noninvasively the presence of cancerous diseases, e.g., skin and breast cancer. However, to diagnose cancerous diseases by IR, the technique requires procedures that explore the relationship between the neoplasm characteristics (size, blood perfusion rate and heat generated) and the resulting temperature distribution on the skin surface. In this research work the dual reciprocity boundary element method (DRBEM) has been coupled with the simulated annealing technique (SA) in a new inverse procedure, which coupled to the IR technique, is capable of estimating simultaneously geometrical and thermophysical parameters of the neoplasm. The method is of an evolutionary type, requiring random initial values for the unknown parameters and no calculations of sensitivities or search directions. In addition, the DRBEM does not require any re-meshing at each proposed solution to solve the bioheat model. The inverse procedure has been tested considering input data for simulated neoplasms of different sizes and positions in relation to the skin surface. The successful estimation of unknown neoplasm parameters validates the idea of using the SA technique and the DRBEM in the estimation of parameters. Other estimation techniques, based on genetic algorithms or sensitivity coefficients, have not been capable of obtaining a solution because the skin surface temperature difference is very small.

scholarly journals Assessing the accumulated stickiness magnitude from fabric–skin friction: effect of wetness level of various fabrics

2018 ◽  
Vol 5 (8) ◽  
pp. 180860 ◽  
Author(s):  
Ka-Po Maggie Tang ◽  
Kam-Hong Chau ◽  
Chi-Wai Kan ◽  
Jin-tu Fan
Keyword(s):  
Growth Rate ◽  
Recovery Period ◽  
Skin Surface ◽  
Cotton Fabrics ◽  
Surface Geometry ◽  
Intimate Apparel ◽  
Fixed Stimulus ◽  
Skin Wetness ◽  
The Difference ◽  
The Relationship

Increasing skin wetness tends to increase fabric–skin adhesion and friction, resulting in wear discomfort or skin injuries. Here, the magnitude estimation approach was used to assess the stickiness sensation perceived in fabrics. Seven fabric types were wetted by putting onto wet ‘skin’ surface and dried for different durations to achieve different wetness levels, simulating wearing conditions during the recovery period after sweating. Results showed that the relationship between magnitude estimates of stickiness and amount of water present in fabric demonstrated a power function. The exponents and constant from power regression show the growth rate of stickiness sensation with moisture intensity and the perceived stickiness under fixed stimulus intensity, respectively. A novel parameter, accumulated stickiness magnitude (ASM), describing how much discomfort a wetted fabric offered throughout the drying period, was developed. Thin cotton fabrics (fabric W01 and W03), having higher saturation level after contacting with wetted skin surface, arouse stronger stickiness feeling and their ASM is remarkably higher. The difference in stickiness estimates is due to the difference in chemical composition and surface geometry. This study suggests us the way to predict perceived stickiness in fabrics with different wetness levels which is useful for applications like sportswear, intimate apparel or healthcare products.

scholarly journals In Vitro Evaluation of the Relationship between the Surface Properties and Retention Force of Resilient Liners and Conventional Liners

2021 ◽  
Vol 19 (4) ◽  
pp. 269-277
Author(s):  
Shunsuke Nagata ◽  
Hiroyuki Saeki ◽  
Aya Kitamura ◽  
Asako Suzuki ◽  
Masayuki Kamada ◽  
...  
Keyword(s):  
Surface Properties ◽  
In Vitro Evaluation ◽  
Retention Force ◽  
The Relationship

scholarly journals Detachable dissolvable microneedles: intra-epidermal and intradermal diffusion, effect on skin surface, and application in hyperpigmentation treatment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pritsana Sawutdeechaikul ◽  
Silada Kanokrungsee ◽  
Thanyapat Sahaspot ◽  
Kamonwan Thadvibun ◽  
Wijit Banlunara ◽  
...  
Keyword(s):  
Vitamin C ◽  
Bioactive Compounds ◽  
Model Compound ◽  
Ex Vivo ◽  
Skin Surface ◽  
Skin Tissue ◽  
Microneedle Array ◽  
Diffusion Effect ◽  
Human Volunteers ◽  
The Relationship

AbstractDelivering bioactive compounds into skin tissue has long been a challenge. Using ex vivo porcine and rat skins, here we demonstrate that a detachable dissolvable microneedle (DDMN) array, a special dissolvable microneedle that allows needle detachment from the base within 2 min post administration, can effectively embed a model compound into epidermis and dermis. Diffusion of the compound from the needle embedding sites to the nearby skin tissue is demonstrated at various post administration periods. The relationship between the time that a conventional dissolvable microneedle array is left on skin without needle detachment from the base and the degree of skin surface abrasion at each microneedle penetration spot is also demonstrated on skin of human volunteers. Co-loading glutathione with vitamin C (vitC) can stabilize vitC in the DDMN. DDMN loaded with vitC and glutathione can help erasing post-acne-hyperpigmentation spots.

scholarly journals Bionic Duplication of FreshNavodon septentrionalisFish Surface Structures

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
Bing Qu ◽  
Jing Wang ◽  
Lanlan Pan ◽  
Chao Pan ◽  
Xiaohui Zhou ◽  
...  
Keyword(s):  
Skin Surface ◽  
Surface Structures ◽  
High Fidelity ◽  
Theoretic Analysis ◽  
Fish Skin ◽  
Fresh Fish ◽  
Pdms Elastomer ◽  
Static Contact ◽  
The Relationship ◽  
Navodon Septentrionalis

Biomimetic superhydrophobic surface was fabricated by replicating topography of the fresh fish skin surface ofNavodon septentrionaliswith polydimethylsiloxane (PDMS) elastomer. A two-step replicating method was developed to make the surface structure of the fresh fish skin be replicated with high fidelity. After duplication, it was found that the static contact angle of the replica was as large as 173°. Theoretic analysis based on Young's and Cassie-Baxter (C-B) model was performed to explain the relationship between structure and hydrophobicity.

scholarly journals Solubilisation of (+)-Usnic Acid in Aqueous Micellar Solutions of Gemini and Heterogemini Surfactants and their Equimolar Mixture

2012 ◽  
Vol 59 (2) ◽  
pp. 36-43 ◽  
Author(s):  
M. Lukáč ◽  
I. Prokipčák ◽  
I. Lacko ◽  
F. Devínsky
Keyword(s):  
Surface Properties ◽  
Natural Compound ◽  
Gemini Surfactant ◽  
Usnic Acid ◽  
Equimolar Mixture ◽  
Micellar Solutions ◽  
Aqueous Micellar Solutions ◽  
The Relationship

AbstractThe solubilisation of natural compound, (+)-usnic acid, in micellar solutions of gemini (N,N’-didecyl-N,N,N’,N’-tetramethylethane-1,2-diyldiammonium dibromide) and heterogemini (decyl 2-[decyl(dimethyl)ammonio]ethylphosphate) surfactants and their equimolar mixture has been studied. The highest solubility was found for gemini surfactant. The relationship between synergism in surface properties of mixture of surfactants and their solubilisation properties is also discussed.

An in vivo staining technique for the demonstration of micro-organisms on the stratum corneum

1980 ◽  
Vol 79 (1-3) ◽  
pp. 201-208
Author(s):  
S. A. Malcolm
Keyword(s):  
Stratum Corneum ◽  
Human Skin ◽  
Staining Technique ◽  
Skin Surface ◽  
Coryneform Bacteria ◽  
Large Populations ◽  
The Creation ◽  
Micro Organisms ◽  
The Relationship

SynopsisAn in vivo staining technique has been developed for the demonstration of micro-organisms on human skin. This technique permits the study of the relationship between micro-organisms and the stratum corneum and its associated structures. It also aids an understanding of the factors involved in the nutrition and survival of micro-organisms on the skin surface.In skin sites with large populations of coryneform species the bacteria tend to accumulate at the edges of corneocytes. This tendency is not shared by members of the micrococcaceae.Agar impressions of the skin surface confirm observations of other workers and suggest that the surface of the stratum corneum is composed of domed corneocytes with a network of troughs or channels surrounding them. It is proposed that the association of coryneform bacteria with the edges of corneocytes may be due to the creation of an environment within the troughs which favours microbial colonisation.

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