scholarly journals The Influence of Natural and Model Forms of Humic Acids on the Dynamic Parameters of Model Membranes

2016 ◽  
Vol 23 (4) ◽  
pp. 695-708
Author(s):  
Izabella Pisarek ◽  
Barbara Pytel ◽  
Aneta Filipiak ◽  
Grzegorz Engel ◽  
Ryszard Olchawa ◽  
...  
Keyword(s):  
Surface Layer ◽  
Humic Acids ◽  
Dynamic Properties ◽  
Egg Yolk ◽  
Electrical Parameters ◽  
Bilayer Membranes ◽  
Membrane Models ◽  
Carl Roth Gmbh ◽  
Electrical Study

Abstract In this paper the influence of humic acid concentrations extracted from Histosols (HA-A) and their model forms (HA-B) separated from humic substances commercially produced by Carl Roth GmbH + Co.KG on the dynamic properties of liposome membranes was determined. Differences in the quality of the humic acids (HA-A and HA-B) were determined by the 1HNMR and FTIR methods. Liposomes from the sonication of egg yolk lecithin (EYL) in an aqueous solution and synthetic Dipalmitoylphosphatidylcholine (DPPC) were used. Fluidity of liposome membranes was determined by the EPR technique with spin probes (TEMPO, 16DOIXYL). The electrical parameters of membranes were found using a Keithley 6517 electrometer. Our study showed significant differences in the influence of HA-A and HA-B on the membranes. In the bilayer membranes of the liposomes of HA-A admixture there was slightly more stiffening of the interior of the membrane in comparison to HA-B. A similar effect was observed in the surface layer of the liposome membranes. This difference is particularly evident for DPPC liposomes, however, the EYL liposomes admixture with HA-B slightly increased the fluidity of the surface layer. Electrical study confirmed this effect. The study shows that natural and model forms of humic acids differ in their effects on the activity of tested membrane models. The strong differences in the interaction of HA-A and HA-B on parameter F in DPPC liposomes can be result from the transport of humic acids connected to the metal ions inside the membranes (xenobiotics present in the environment).

The Research on Cylindrical Ultrasonic Rolling Machining Used for Strengthening Metal Surface

2011 ◽  
Vol 314-316 ◽  
pp. 28-32
Author(s):  
Wen Rui Chen ◽  
Yong Ma ◽  
Zhi Feng Lou
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Service Life ◽  
Processing Time ◽  
Steel Surface ◽  
Dynamic Properties ◽  
Surface Characteristics ◽  
Normal Operation ◽  
Cylindrical Roller

Material mechanics and dynamic properties affect the service life of parts, and also the normal operation of machines. In order to reduce the processing time and improve the quality of machining, a cylindrical roller was used in the research. Cylindrical ultrasonic rolling machining (CURM) is an efficient way to enhance the service properties and surface characteristics of components. CURM was designed and later tested on the 45# steel surface. The result showed that the plastic deformation of surface layer was symmetrical and the surface grain was reduced in size by approximately 4.2%. The result of the experiment showed that CURM was effective in enhancing the productivity as well as enlarging the yield strength and hardness of components.

The Influence Of The Led Luminaires Electrical Parameters On Their Correlated Colour Temperature During Operation Mode

2020 ◽  
pp. 89-96
Author(s):  
Sergei S. Kapitonov ◽  
Alexei S. Vinokurov ◽  
Sergei V. Prytkov ◽  
Sergei Yu. Grigorovich ◽  
Anastasia V. Kapitonova ◽  
...  
Keyword(s):  
Operation Mode ◽  
Light Sources ◽  
Electrical Parameters ◽  
Colour Temperature ◽  
Radiation Spectra ◽  
Service Period ◽  
Close Proximity ◽  
Definition Of ◽  
Comprehensive Study

The article describes the results of comprehensive study aiming at increase of quality of LED luminaires and definition of the nature of changes in their correlated colour temperature (CCT) in the course of operation. Dependences of CCT of LED luminaires with remote and close location of phosphor for 10 thousand hours of operation in different electric modes were obtained; the results of comparison between the initial and final radiation spectra of the luminaires are presented; using mathematical statistics methods, variation of luminaire CCT over the service period claimed by the manufacturer is forecast; the least favourable electric operation modes with the highest CCT variation observed are defined. The obtained results have confirmed availability of the problem of variation of CCT of LED luminaires during their operation. Possible way of its resolution is application of more qualitative and therefore expensive LEDs with close proximity of phosphor or LEDs with remote phosphor. The article may be interesting both for manufacturers and consumers of LED light sources and lighting devices using them.

Kualitas Semen Cair Kambing Boer Berbahan Pengencer Air Kelapa Muda Varietas Viridis Setelah Simpan Dingin

2019 ◽  
Vol 6 (1) ◽  
pp. 78
Author(s):  
Muhammad Ade Salim ◽  
Muhammad Nur Ihsan ◽  
Nur Isnaini ◽  
Trinil Susilawati
Keyword(s):  
Semen Quality ◽  
Block Design ◽  
Animal Husbandry ◽  
Egg Yolk ◽  
Coconut Water ◽  
Boer Goat ◽  
Randomized Block Design ◽  
Frozen Semen ◽  
Artificial Vagina

ABSTRAKAir kelapa muda varietas viridisdapat dijadikan pengencer aletrnatif semen cair bagi program IB di daerah minim sarana semen beku. Tujuan penelitian ini untuk menguji pengaruh penggunaan air kelapa muda viridissebagai bahan pengencer terhadap kualitas semen cair kambing Boer setelah didinginkan. Dilaksanakanselama 3 bulan di Laboratorium Fakultas Peternakan UBUnit SumberSekar,Malang. Metodenya yaitu eksperimen. Semen dari  3 pejantan Boer umur 3-5 tahun, dikoleksi seminggu sekali dengan VB. Air kelapa mudaviridis umur 5-7 bulan serta tris aminomethane sebagai kontrol. Didesain menggunakan Rancangan Acak Kelompok (RAK) dengan 2 perlakuan yaitu P0 (tris aminomethane + 10% KT) dan  P1 (air kelapa muda viridis + 10% KT) masing-masing diulang 10 kali. Data dianalisis dengan analisis Ragam (Anova) dengan software Genstat 18. Variabelnya yaitu motilitas individu, viabilitas dan abnormalitas. Hasil penelitian yaitu motilitas individu pada P1bertahan sampai 4 hari (40,5± 24,3%), viabilitas terbaik sampai hari ke-5 (42±24,6%), abnormalitas terendah di hari ke-7(1,31± 0,6). Kesimpulannya, Pengencer air kelapa muda viridis dapat mempertahankan kualitas semen cair kambing Boer selama 4 hari untuk motilitas dan 5 hari untuk viabilitas.Kata Kunci:pengencer, air kelapa, varietas viridisABSTRACTYoung viridis coconut water could be used as an alternative to liquid semen diluent for artificial insemination program in the area with limited facility for frozen semen production. This study evaluated the use of young coconut water as a diluent on liquid semen quality of Boer goat after cold storage. This study was carried out for 3 months at Sumber Sekar Laboratory, Faculty of Animal Husbandry, University of Brawijaya, Malang. The semen was collected from 3 Boer bucks aged at 3 to 5 years old. The semen collection was done once a week with the aid of artificial vagina. The diluents used were young Viridis coconut (5 to 7 months old) and tris aminomethane. The method used was an experiment in a randomized block design with 2 treatments and 10 replicates. The treatments used were T0: tris aminomethane + 10% egg yolk (control) and T1:  young Viridis coconut water + 10% egg yolk. Data were analyzed by analysis of variance using Genstat 18 software. The variables measured were sperm individual motility, viability, and abnormality. The results showed that the sperm individual motility in T1 survived up to 4 days (40.5± 24.3%), the best viability at 5 days (42.0±24.6%),  while the lowest abnormality at 7 days (1.31±0.6). It could be concluded that: 1. Tris aminomethane diluent has higher quality with the storage length up to 9 days, 2. Young Viridis coconut water diluent could preserve liquid semen quality of Boer goat up to 4 days for sperm motility and 5 days for sperm viability.Keywords: diluents, coconut water, viridis variety

Automation of selected brazes' dynamic properties in high-temperatures' measurement process

2013 ◽  
Vol 18 (2-3) ◽  
pp. 33-41
Author(s):  
Dominik Sankowski ◽  
Marcin Bakala ◽  
Rafał Wojciechowski
Keyword(s):  
Surface Tension ◽  
High Temperatures ◽  
Dynamic Properties ◽  
Automatic Measurement ◽  
Measurement Methodology ◽  
Joining Process ◽  
Wetting Force ◽  
Research Grant

Abstract The good quality of several manufactured components frequently depends on solidliquid interactions existing during processing. Nowadays, the research in material engineering focuses also on modern, automatic measurement methods of joining process properties, i.a. wetting force and surface tension, which allows for quantitative determination of above mentioned parameters. In the paper, the brazes’ dynamic properties in high-temperatures’ measurement methodology and the stand for automatic determination of braze’s properties, constructed and implmented within the research grant nr KBN N N519 441 839 - An integrated platform for automatic measurement of wettability and surface tension of solders at high temperatures, are widely described

Assessment of Pomegranate Juice as Antioxidant in Extender on Cauda Epididymis Spermatozoal Quality of Buck at Refrigerated Temperature

2019 ◽  
Vol 15 (02) ◽  
pp. 26-29
Author(s):  
Amarjeet Amarjeet ◽  
C T Khasatiya ◽  
L Chaudhary
Keyword(s):  
Detrimental Effect ◽  
Egg Yolk ◽  
Antioxidant Effect ◽  
Pomegranate Juice ◽  
Antioxidant Additive ◽  
Epididymal Spermatozoa ◽  
The Dead

The present investigation was carried out to study the refrigeration preservation of the cauda epididymal retrieved spermatozoa of buck in Tris egg yolk citrate (TEYC) dilutor containing pomegranate juice as antioxidant additive. The retrieved cauda epididymal spermatozoa extended in TEYC dilutor were studied in five groups by adding different concentration of pomegranate juice as additive (0% as control T1 group and 5%, 10%, 15% and 20% as treatment T2, T3, T4 and T5 groups, respectively) and storing at refrigerated temperature up to 48 hr. The results showed that the control extender had the least dead, abnormal and HOS non-reacted sperm percent among all treatments tested and that with increasing the pomegranate juice concentration in dilutor, the percentage of the dead, abnormal and HOST non-reacted spermatozoa increased significantly. The same trend was observed at all 12 hourly storage intervals indicating its detrimental effect on epididymal sperms of bucks at refrigeration temperature. The dead, abnormal, and HOST non-reacted sperm were significantly and positively interrelated with each other (r = 0.53-0.83). It was concluded that the inclusion of pomegranate juice in TEYC dilutor did not show any beneficial/antioxidant effect on epididymal sperms of buck in fresh or refrigerated semen and in fact all the levels of pomegranate juice (5% to 20%) were detrimental to cauda epididymal spermatozoa of a buck.

Ultrajet Mesodiagnostic Probabilistic Model for Surface Layer’s Variable Defectiveness of Complex Technology Products

2021 ◽  
Vol 882 ◽  
pp. 289-295
Author(s):  
Andrey Leonidovich Galinovskiy ◽  
Aleksandr Aleksandrovich Barzov ◽  
Mary Alekseevna Prokhorova
Keyword(s):  
Surface Layer ◽  
Sufficient Conditions ◽  
Calculated Data ◽  
Hydrodynamic Effect ◽  
Topographic Features ◽  
Technology Products ◽  
Complex Technology ◽  
Materials Used ◽  
Necessary And Sufficient

Technologically, ultrajet mesodiagnostics (UJM) consists of local hydroerosive indentation by ultrajets (UJ) of water on the surface of the analyzed object (OA) and the subsequent study of the results of this minimally invasive microdestructive effect on its surface layer. Obviously, mathematical models’ construction of the functional relationship between the informative-physical signs of hydroerosive UJ destruction and the surface layer’s state parameters of various OA, primarily their defectiveness, is very important for the development of this potentially promising technology for ensuring the quality of critical products, mainly aviation and other industries. In this regard, the work proposes a probabilistic UJM model, which consists of analyzing the kinetics of the formation of an aggregate set of eroded particles, as a process caused by a combination of appropriate necessary and sufficient conditions for its implementation. The former include the topographic features of the microdefectiveness’ characteristics of the surface layer material, and the latter consist of a certain variational-force hydrodynamic effect of the diagnostic UJ on it. This approach made it possible to obtain calculated data related to probabilistic distribution of the UJ-eroded particles’ sizes of hypothetical OA, as a coordinate function describing the microdefects’ concentration in its surface layer. These functions are close to the available results of experimental UJM of typical and promising materials used in the manufacture of machinery technology.

scholarly journals Shape Errors, Internal Porosity, Linear Dimensions Accuracy and Allowances for the Machining of Castings Made in the Replicast CS Process

2014 ◽  
Vol 14 (3) ◽  
pp. 25-28
Author(s):  
R. Haratym ◽  
M. Sieczka ◽  
R. Biernacki ◽  
J. Kwapisz
Keyword(s):  
Surface Layer ◽  
Comprehensive Assessment ◽  
Process Models ◽  
Modern Equipment ◽  
Internal Porosity ◽  
Linear Dimensions ◽  
Shape Errors ◽  
Measuring Machine ◽  
Made In

Abstract This research presents comprehensive assessment of the precision castings quality made in the Replicast CS process. The evaluation was made based on quality of the surface layer, shape errors and the accuracy of the linear dimensions. Studies were carried out on the modern equipment, among other things a Zeiss Calypso measuring machine and profilometer were used. Obtained results allowed comparing lost wax process models and Replicast CS process.

scholarly journals Suplementasi Sari Belimbing Wuluh (Averrhoa bilimbi L.) dalam Air Minum terhadap Produktivitas Telur Puyuh

2020 ◽  
Vol 18 (2) ◽  
pp. 54-61
Author(s):  
Lylya Wahyuni ◽  
M R Ramdani ◽  
N O Imama ◽  
V E Larasati ◽  
A R Fahmi ◽  
...  
Keyword(s):  
Drinking Water ◽  
Egg Quality ◽  
Egg Yolk ◽  
Positive Control ◽  
Feed Conversion ◽  
Physical Quality ◽  
Randomized Design ◽  
Egg Shells ◽  
Haugh Unit

Supplementation of Averrhoa bilimbi L. juice which contains vitamin C and organic acid in drinking water has been proposed to reduce the effect of heat stress on the quail layer.  So this is expected to increase the productivity of quail and their egg quality. The aim of this research was to determine the effect of A. bilimbi juice supplementation in quail drinking water on quail performance,  physical quality of egg, and egg yolk antioxidant level. Two hundred and forty birds aged 4-5 weeks were maintained for 42 days. A Completely Randomized Design was used in this study with 4 treatments. Each treatment has 4 replications and 15 quails in each replications. Addition of Vita Chick (P0) to the drinking water was used as a positive control. The treatments given were the addition of A. bilimbi extract with different levels of 0% (P1), 2.5% (P2), and  5% (P3) respectively. The variables observed were quail performance, physical egg quality, and egg yolk antioxidant levels. The results showed that the  physical quality of quail eggs obtained were the weight of albumen and egg shells did not different all treatments. The  addition of A. bilimbi juice in drinking water  has affected on the weight and percentage of albumen, eggshell, and Haugh Unit. The addition of 2.5% of A.bilimbi juice (P2)  had the lowest feed conversion ratio (FCR). However it showed the highest Haugh Unit number of the egg. There was no different effect of the highest dose of A. bilimbi juice (5%, P3) on the egg yolk antioxidant  activity and capacity (41.54%  and 23.91 ppm respectively).  It was concluded that supplementation of A. bilimbi juice in drinker water  could  changed to antistress drug commercial.

scholarly journals Rated definition of degree of cutter coating influence upon parameters of surface layer quality of parts worked

2017 ◽  
Vol 2 (7) ◽  
pp. 20-24
Author(s):  
Вячеслав Безъязычный ◽  
Vyacheslav Bezyazychnyy ◽  
Максим Басков ◽  
Maksim Baskov
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Residual Stresses ◽  
Layer Surface ◽  
Wear Resistant Coatings ◽  
Cutter Wear ◽  
Definition Of ◽  
Surface Layer Quality ◽  
The Impact

The impact of cutter wear-resistant coatings upon cutting process parameters and characteristics of surface layer quality in the parts worked: residual stresses, a degree and a depth of work hardening of a surface layer, surface roughness is investigated.

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