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The Kibble balance experiment is used to redefine the kilogram as a unit of mass based on the Planck constant. To demonstrate and understand the basic principle of the Kibble balance, the National Institute of Standards (NIS)-Egypt has constructed a prototype Kibble balance that can measure gram-level masses with 0.01% relative uncertainty. Through the construction of this prototype, the challenges can be studied and addressed to overcome the weaknesses of NIS’s prototype. This study presents the design and construction of the prototype Kibble balance. It also focuses on the design and performance of the magnetic system, which is a crucial element of the Kibble balance. Analytical modeling and finite element analysis were used to evaluate and improve the magnet system. Several other aspects were also discussed, including the yoke’s material and enhancing the magnetic profile within the air gap of the magnet system. Over a vertical distance of 30 mm inside the air gap, the magnetic flux density was found to be 0.3 T, and the uniformity was found to be 8 x 10 ^-5.

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Authors and Affiliations

Sayed Emira

1

E.R. Shaaban

2

M.M. Rashad

3

Shaker A. Gelany

1

National Institute of Standards (NIS), Tersa St, El-Haram, PO Box 136, Code 12211, Giza, Egypt
Department of Physics, Faculty of Science, Al-Azhar University, Assiut 71542, Egypt
Central Metallurgical Research and Development Institute (CMRDI), P.O. BOX. 87 Helwan, Egypt 11421

Investigation of Tribological and Mechanical Properties of Biodegradable AZ91 Alloy Produced by Cold Chamber High Pressure Casting Method

Levent Urtekin Recep Arslan Fatih Bozkurt Ümit Er

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 1 | 205-216 | DOI: 10.24425/amm.2021.134777

Keywords die casting AZ91 magnesium alloy cold chamber high pressure casting method mechanical properties of AZ91 magnesium alloy wear of AZ91 alloy tribological properties of AZ91 alloy

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Abstract

In this study, AZ91 Magnesium alloy is produced by cold chamber high pressure die casting (HPDC) method. Different combinations of the cold chamber HPDC process parameters were selected as; in-mold pressure values of 1000 bar and 1200 bar, the gate speed of 30 m/s and 45 m/s, the casting temperatures of 640°C and 680°C. In addition, the test samples were produced by conventional casting method. Tensile test, hardness test, dry sliding wear test and microstructure analysis of samples were performed. The mechanical properties of the samples produced by the cold chamber HPDC and the conventional casting method were compared. Using these parameters; the casting temperature 680°C, in-mold pressure 1000 bar and the gate speed 30 m/s, the highest tensile strength and the hardness value were obtained. Since the cooling rate in the conventional casting method is slower than that of the cold chamber HPDC method, high mechanical properties are obtained by the formation of a fine-grained structure in the cold chamber HPDC method. In dry sliding wear tests, it was observed that there was a decrease in friction coefficient and less material loss with the increase of hardness values of the sample produced by the cold chamber HPDC method.

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Authors and Affiliations

Levent Urtekin

Recep Arslan

Fatih Bozkurt

Ümit Er

Runoff velocity behaviour on smooth pavement and paving blocks surfaces measured by a tilted plot

Laksni Sedyowati Suhardjono Suhardjono Ery Suhartanto Mohammad Sholichin

Journal of Water and Land Development | 2017 | No 33

Keywords low-impact development, overland flow, permeable pavement, urban drainage

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Authors and Affiliations

Laksni Sedyowati

Suhardjono Suhardjono

Ery Suhartanto

Mohammad Sholichin

Comparative evaluation of single and combined efficacy of dipyridamole, ketotifen and quercetin on cyclosporine induced hepatorenal toxicity

B. Dik T.M. Parlak O. Tufan F.B. Ozgur A. Er

Polish Journal of Veterinary Sciences | 2023 | vol. 26 | No 4 | 549-557 | DOI: 10.24425/pjvs.2023.148275

Keywords hepatorenal toxicity cyclosporine ketotifen dipyridamole quercetin

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Abstract

Cyclosporine is an immunosuppressive drug that is used to prevent tissue rejection in organ transplants and to treat autoimmune diseases such as psoriasis and rheumatoid arthritis. It has important toxic effects in many organs such as the liver and kidney. The aim of this study was to determine and compare the effectiveness of the single and combined treatment of dipyridamole, which is a vasodilator and has an antioxidant effect, ketotifen which is toll-like receptor-4 inhibitory and has an antioxidant effect, quercetin which is an antioxidant and has an anti-inflammatory effect in cyclosporine-induced hepatorenal toxicity. Forty-eight Wistar Albino rats were divided into 7 groups. The research period was 21 days. The cyclosporine increased serum ALT and AST levels, in contrast to their increased levels prevented by all the treatments. The serum creatinine level decreased significantly with ketotifen and combined treatment, while cyclosporine partially increased serum creatinine and urea levels. The urine microalbumin and protein levels were increased significantly by cyclosporine, whereas they decreased with dipyridamole treatment. The protein levels decreased by quercetin and combined treatments. The kidney injury molecule- 1 and retinol-binding protein levels were increased by the cyclosporine, while ketotifen treatment partially decreased them. In conclusion, ketotifen and dipyridamole can prevent cyclosporine- induced hepatorenal toxicity and quercetin can increase the effectiveness of this treatment.

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Authors and Affiliations

B. Dik

1

T.M. Parlak

1

O. Tufan

1

F.B. Ozgur

2

A. Er

1

Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Selcuk University, Ardicli Neighborhood, 42130, Konya, Turkey
Harran University, Birecik Vocational School, Laboratory and Veterinary Health Program, Karsiyaka Neighborhood, Prof. Dr. İbrahim Halil MUTLU Avenue, 63400, Sanliurfa, Turkey

Evaluation of infiltration models for mineral soils with different land uses in the tropics

Nugroho Suryoputro Suhardjono Widandi Soetopo Ery S. Suhartanto Lily M. Limantara

Journal of Water and Land Development | 2018 | No 37

Keywords infiltration models land use mineral soil tropical climate

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Authors and Affiliations

Nugroho Suryoputro

Suhardjono

Widandi Soetopo

Ery S. Suhartanto

Lily M. Limantara

Geometry Characterization of AISI 430 Stainless Steel Microstructuring Using Laser

E.R. Moldovan C. Concheso Doria J.L. Ocaña Moreno L.S. Baltes E.M. Stanciu C. Croitoru A. Pascu M.H. Tierean

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 2 | 645-652 | DOI: 10.24425/amm.2022.137801

Keywords microstructuring laser ferritic stainless steel surface patterning

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Abstract

Laser-generated surface patterns provide the means for local mechanical interlocking between the joined materials, tunes the wettability of surfaces that come in contact, and generally are the main factor for bonding strength enhancement, especially between dissimilar materials. This paper presents the influence of different patterning overlays generated with a pulsed laser on the surface of stainless-steel sheets. For all experiments, an overlapping degree of 90% has been chosen between three different patterns, while the engraving speed, pulse frequency and number of passes have varied. The textured surfaces’ morphology was assessed through optical microscopy, and the roughness of the surfaces was correlated with the corresponding experimental parameters. The results have indicated promising insights for joining stainless steel to plastic materials, which is otherwise difficult to assess through usual welding techniques.

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Authors and Affiliations

E.R. Moldovan

1

e-mail:

ORCID:

C. Concheso Doria

2

e-mail:

ORCID:

J.L. Ocaña Moreno

3

e-mail:

ORCID:

L.S. Baltes

1

e-mail:

ORCID:

E.M. Stanciu

1

e-mail:

ORCID:

C. Croitoru

1

e-mail:

ORCID:

A. Pascu

1

e-mail:

ORCID:

M.H. Tierean

1

e-mail:

ORCID:

Transilvania University of Brasov, Brasov, Romania
BSH Electrodomésticos España S.A., Zaragoza, Spain
Universidad Politecnica de Madrid, Madrid, Spain

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The effect of feeding system and sex on the performance and selected gastrointestinal features of fattening pigs

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Performance, pork quality and fatty acid composition of entire males, surgically castrated or immunocastrated males, and female pigs reared under organic system

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Effect of humic-plant feed preparations on biochemical blood parameters of laying hens in deep litter housing system

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Establishing and characterizing a permanent magnet system for the prototype of NIS's Kibble balance

Abstract

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Investigation of Tribological and Mechanical Properties of Biodegradable AZ91 Alloy Produced by Cold Chamber High Pressure Casting Method

Abstract

Authors and Affiliations

Runoff velocity behaviour on smooth pavement and paving blocks surfaces measured by a tilted plot

Authors and Affiliations

Comparative evaluation of single and combined efficacy of dipyridamole, ketotifen and quercetin on cyclosporine induced hepatorenal toxicity

Abstract

Bibliography

Authors and Affiliations

Evaluation of infiltration models for mineral soils with different land uses in the tropics

Authors and Affiliations

Geometry Characterization of AISI 430 Stainless Steel Microstructuring Using Laser

Abstract

Authors and Affiliations