Copper Plating on the Carbon Fibers by Double Pulse

2011 ◽  
Vol 148-149 ◽  
pp. 928-931 ◽  
Author(s):  
Song Gao ◽  
Ming Jie Fan ◽  
Gui Ping Wang
Keyword(s):  
Carbon Fibers ◽  
Current Density ◽  
Duty Cycle ◽  
Room Temperature ◽  
Fiber Surface ◽  
Copper Coating ◽  
Working Time ◽  
Technical Parameters ◽  
Gain Rate

The effects of positive and reverse working time, electroplating time, current density, duty cycle on the weight-gain rate were investigated. The optimized technical parameters were as follows: room temperature, 300 ms of positive working time, 30 ms of reverse working time, 40% of duty cycle, 8.20 ×10-5 A/mm2 of current density, 6 min of electroplating time. The quality of copper coating was checked with SEM. The adhesion between the coating and carbon fibers was tested by the method of psychro-thermal cycles. Additionally, comparison to pulse plating and direct current plating was made. The obtained results showed that a flat, detailed and well-crystalloid copper coating on the carbon fiber surface was obtained with the present conditions. The adhesion between the coating and carbon fibers was 450kPa.

Experimental Researching of Thermal - Assisted Milling with Induction on Surface Roughness of SKD11 Steel

2019 ◽  
Vol 889 ◽  
pp. 190-196
Author(s):  
Mac Thi Bich ◽  
Pham Thi Hoa ◽  
Banh Tien Long ◽  
Nguyen Duc Toan
Keyword(s):  
Surface Roughness ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
End Milling ◽  
Heating Process ◽  
Work Piece ◽  
Technical Parameters ◽  
Roughness Model ◽  
Good Agreement

This paper presents experimental studied results about surface roughness during end milling SKD11 steel under room temperature and work-piece preheated condition. Conventional samples were first performed. The samples which are same technical parameters were then performed at elevated temperatures to evaluate effective of heating process on the surface roughness. Orthogonal array Taguchi method was used to experimental design. The results showed that the surface quality of product was significantly improved under thermal - assisted milling. The surface roughness model during machining at room and elevated temperatures were evaluated and showed a good agreement with result of experiments.

scholarly journals Thermal stability of the carbon fibers with SiO2 coating

2019 ◽  
Vol 298 ◽  
pp. 00090 ◽  
Author(s):  
Rida Gallyamova ◽  
Sergei Galyshev ◽  
Fanil Musin ◽  
Vladimir Dokichev
Keyword(s):  
Silicon Dioxide ◽  
Carbon Fibers ◽  
Kinematic Viscosity ◽  
Colloidal Particles ◽  
Elevated Temperatures ◽  
Sol Gel ◽  
Fiber Surface ◽  
Sio2 Coating ◽  
Thermal Stability Of

This paper presents the results of a study of silicon dioxide coating deposited on the surface of carbon fiber by the sol-gel method. The effect of the viscosity of the prepared sol-gel solution and the oxidizing properties at elevated temperatures obtained by SiO2 coatings were studied. It was found that the kinematic viscosity of the sol-gel solution does not change for 72 hours. An increase in viscosity leads to the formation of colloidal particles, which degrades the quality of the coatings.Studies have shown that in the temperature range 600-800 °C, the quality of uncoated fibers degrade, but the SiO2 coating well protects the fiber surface and significantly slows down the rate of destruction.

Liquid Phase Electroepitaxial (LPEE) Growth of GaSb and GaInAsSb

1989 ◽  
Vol 160 ◽  
Author(s):  
Shanthi N. Iyer ◽  
Ali Abul-Fadl ◽  
Albert T. Macrander ◽  
Jonathan H.Lewis ◽  
Ward J. Collis ◽  
...  
Keyword(s):  
Growth Rate ◽  
Liquid Phase ◽  
Current Density ◽  
Room Temperature ◽  
Composition Range ◽  
X Ray Diffraction ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
A Current

AbstractLiquid phase electroepitaxial technique has been used for the growth of GaSb and GalnAsSb in the composition range corresponding to peak band gap wavelengths of 1.7-2.28μm. The growth rate of these layers were examined as a function of current density. The growth rates of these layers are typically 0.8μm/min. at a current density of 10A/cm2. The quality of the layers was evaluated by x-ray diffraction and room temperature photoluminescence.

THE STUDY ON TA VAT WINE PRODUCTION FROM SUGAR PALM (ARENGA PINNATA) SAP

2014 ◽  
Vol 83 (5) ◽  
Author(s):  
Nguyễn Thị Hồng Thu ◽  
Đặng Minh Nhật ◽  
Nguyễn Hoàng Dung
Keyword(s):  
Room Temperature ◽  
Fermentation Process ◽  
Inoculum Size ◽  
Wine Fermentation ◽  
Wine Production ◽  
Factors Affecting ◽  
Natural Fermentation ◽  
Tropical Asia ◽  
Best Parameters

Sugar palm (Arenga pinnata) is a feather palm native to tropical Asia. In Vietnam, it is named Búng Báng or Đoác and grown only on the highlands in the central or northern part of Vietnam. It is utilized for many purposes, especially for Ta Vat wine production - a characteristic and unique product of Co Tu ethnic minority. However, because of the natural fermentation used in the production, the product quality is inconsistent. The purpose of this study was to examine a new procedure of using palm sap for making Ta Vat wine. Some characteristics of the sap, which was collected at Nam Giang district, Quang Nam province are determined, proving the potential of the sap for making wine product. The quality of sap changes quickly at room temperature. At low temperature (4 - 60C), the changes in sap quality are apparently slower. Examining some factors affecting its quality during the wine fermentation process, we determined the best parameters for the fermentation process as follows: inoculum size of 3% with cell density of about 1x108 cells/ml, the addition of the extract from the bark of Ceylon ironwood (Mesua ferrea L.) 4%. Keywords: Arenga pinnata, sap, Ceylon ironwood bark, Mesua ferrea L., wine fermentation.

scholarly journals A 2.1 GHz, 210 μW, —189 dBc/Hz DCO with Ultra Low Power DCC Scheme

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 805
Author(s):  
Shi Zuo ◽  
Jianzhong Zhao ◽  
Yumei Zhou
Keyword(s):  
Low Power ◽  
Current Efficiency ◽  
Phase Noise ◽  
Duty Cycle ◽  
Semiconductor Manufacturing ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Cmos Process ◽  
Ultra Low Power ◽  
Measured Phase

This article presents a low power digital controlled oscillator (DCO) with an ultra low power duty cycle correction (DCC) scheme. The DCO with the complementary cross-coupled topology uses the controllable tail resistor to improve the tail current efficiency. A robust duty cycle correction (DCC) scheme is introduced to replace self-biased inverters to save power further. The proposed DCO is implemented in a Semiconductor Manufacturing International Corporation (SMIC) 40 nm CMOS process. The measured phase noise at room temperature is −115 dBc/Hz at 1 MHz offset with a dissipation of 210 μμW at an oscillating frequency of 2.12 GHz, and the resulin figure-of-merit is s −189 dBc/Hz.

Improvement of quality of carbon fiber rods by the impregnation of carbon fibers with oligoorganosiloxanes

2021 ◽  
Vol 70 (4) ◽  
pp. 767-772
Author(s):  
N. G. Mazhorova ◽  
P. V. Ivanov ◽  
O. V. Zaichenko ◽  
A. V. Lakhin ◽  
S. Yu. Kanterin ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers

scholarly journals In vitro characteristics and in vivo platelet quality of whole blood treated with riboflavin and UVA / UVB light and stored for 24 hours at room temperature

Transfusion ◽  
2021 ◽  
Vol 61 (S1) ◽  
Author(s):  
Turid Helen Felli Lunde ◽  
Lindsay Hartson ◽  
Shawn Lawrence Bailey ◽  
Tor Audun Hervig
Keyword(s):  
Whole Blood ◽  
Room Temperature

Proteinase and phospholipase activities and development at different temperatures of yeasts isolated from bovine milk

2011 ◽  
Vol 78 (4) ◽  
pp. 385-390 ◽  
Author(s):  
Priscilla A Melville ◽  
Nilson R Benites ◽  
Monica Ruz-Peres ◽  
Eugenio Yokoya
Keyword(s):  
Dairy Products ◽  
Room Temperature ◽  
Bovine Milk ◽  
Raw Milk ◽  
Pathogenic Potential ◽  
Proteinase Production ◽  
Different Temperatures ◽  
Quality Of Milk ◽  
Means Of Transmission

The presence of yeasts in milk may cause physical and chemical changes limiting the durability and compromising the quality of the product. Moreover, milk and dairy products contaminated by yeasts may be a potential means of transmission of these microorganisms to man and animals causing several kinds of infections. This study aimed to determine whether different species of yeasts isolated from bovine raw milk had the ability to develop at 37°C and/or under refrigeration temperature. Proteinase and phospholipase activities resulting from these yeasts were also monitored at different temperatures. Five genera of yeasts (Aureobasidium sp., Candida spp., Geotrichum spp., Trichosporon spp. and Rhodotorula spp.) isolated from bovine raw milk samples were evaluated. All strains showed one or a combination of characteristics: growth at 37°C (99·09% of the strains), psychrotrophic behaviour (50·9%), proteinase production (16·81% of the strains at 37°C and 4·09% under refrigeration) and phospholipase production (36·36% of the isolates at 37°C and 10·9% under refrigeration), and all these factors may compromise the quality of the product. Proteinase production was similar for strains incubated at 37°C (16·81% of the isolates) and room temperature (17·27%) but there was less amount of phospholipase-producing strains at room temperature (15·45% of the isolates were positive) when compared with incubation at 37°C (36·36%). Enzymes production at 37°C by yeasts isolated from milk confirmed their pathogenic potential. The refrigeration temperature was found to be most efficient to inhibit enzymes production and consequently ensure better quality of milk. The viability of yeasts and the activity of their enzymes at different temperatures are worrying because this can compromise the quality of dairy products at all stages of production and/or storage, and represent a risk to the consumer.

scholarly journals A Simulation Model of Construction Projects Executed in Random Conditions with the Overlapping Construction Works

2021 ◽  
Vol 13 (11) ◽  
pp. 5795
Author(s):  
Sławomir Biruk ◽  
Łukasz Rzepecki
Keyword(s):  
Simulation Model ◽  
Technological Process ◽  
Construction Projects ◽  
Working Time ◽  
Simulation Studies ◽  
Construction Methods ◽  
The Impact ◽  
Construction Works

Reducing the duration of construction works requires additional organizational measures, such as selecting construction methods that assure a shorter realization time, engaging additional resources, working overtime, or allowing construction works to be performed simultaneously in the same working units. The simultaneous work of crews may affect the quality of works and the efficiency of construction processes. This article presents a simulation model aimed at assessing the impact of the overlap period on the extension of the working time of the crews and the reduction of a repetitive project’s duration in random conditions. The purpose of simulation studies is to provide construction managers with guidelines when deciding on the dates of starting the sequential technological process lines realized by specialized working crews, for sustainable scheduling and organization of construction projects.

scholarly journals Skyrmion flow near room temperature in an ultralow current density

2012 ◽  
Vol 3 (1) ◽  
Author(s):  
X.Z. Yu ◽  
N. Kanazawa ◽  
W.Z. Zhang ◽  
T. Nagai ◽  
T. Hara ◽  
...  
Keyword(s):  
Current Density ◽  
Room Temperature
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