A Quantitative Evaluation of the Quality of Recycled Steel in Uganda

2012 ◽  
Author(s):  
C. Senfuka ◽  
J. B. Kirabira ◽  
J. K. Byaruhanga
Keyword(s):  
Mechanical Properties ◽  
Raw Material ◽  
Emission Spectrometry ◽  
Test Results ◽  
Geometrical Properties ◽  
Direct Reduced Iron ◽  
The Relationship ◽  
Recycled Steel ◽  
Made In

All steel made in Uganda is currently manufactured from scrap. Such steel has often been characterized by unpredictable performance in consonance with its inconsistent raw material inputs. This study evaluates and relates the mechanical, metallurgical and geometrical properties of these bars in order to identify the factors underlying the performance of the products from this steel and examine the relationship with their scrap content. In order to study the steels, tensile, torsion and micrographic tests have been carried out together with spark emission spectrometry on samples collected from different plants. The test results generally indicate impressive steel resilience, strength and metallographic properties in spite of relatively high and irregular carbon content. Limited weldability, uniaxiality of properties, uneven scatter of microelements and substantial non-uniformity of longitudinal mechanical properties have been observed. Rolling and post rolling defects have been noted. The geometric reliability of the bars has also been found generally low. Improvement of secondary refinement, use of direct reduced iron (DRI) diluent and more diligent sorting have suggested as solutions.

scholarly journals KAJIAN HUBUNGAN KUAT LENTUR DENGAN KUAT TEKAN BETON

2017 ◽  
Vol 2 (1) ◽  
pp. 38
Author(s):  
Suhendra Suhendra
Keyword(s):  
Compressive Strength ◽  
Bending Test ◽  
Test Results ◽  
Rigid Pavement ◽  
Flexure Strength ◽  
Almost All ◽  
The Relationship ◽  
General Specification ◽  
Made In

Currently, rigid pavement in almost all national, provincial and district roads is used instead of flexible pavement. One of the rigid concrete pavement quality controls is the flexural strength (fr = 45 kg / cm2 at 28 days) as stated in the General Specification of Binamarga year 2010 revision 3. This specification no longer regulates the value of compressive strength of the rigid pavement. This is a challenge for the construction’s practicians in implementation of the specification, because during this time the procurement of cement concrete is based on the compressive strength. The formula is in SNI 2847: 2013 on concrete that fr = 0,62Öfc’. While the construction practitioners generally still use the binamarga specifications of previous revisions that contain the quality of concrete (K-350), so that the quality of bending in general is not achieved. This research covers the value of bending test results conducted in the Engineering Laboratory on beams provided by third parties using lab services, as well as test specimens made in the laboratory. The test results show that there is a correlation between the flexure strength to the compressive strength of the concrete. The relationship is more or less the same as the formula contained in SNI concrete.Keywords: Concrete, Flexure strength, compressive strength, Binamarga Specs 2010 rev. 3

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

Size Effect on Mechanical Properties of LVL

2014 ◽  
Vol 887-888 ◽  
pp. 824-829
Author(s):  
Qing Fang Lv ◽  
Ji Hong Qin ◽  
Ran Zhu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Size Effect ◽  
Tensile Test ◽  
Compression Test ◽  
Test Results ◽  
Laminated Veneer Lumber ◽  
Object Of Study ◽  
The Relationship

Laminated veneer lumber is taken as an object of study, and use LVL specimens of different sizes for compression test and tensile test. The goal of the experiment is to investigate the size effect on compressive strength and tensile strength as well as the influence of the secondary glued laminated face, which appears in the secondary molding processes. The results show that both compressive strength and tensile strength have the size effect apparently and the existence of the secondary glued laminated face lower the compressive strength of LVL specimens. Afterwards, the relationship between compressive strength and volume along with tensile strength and area are obtained by the test results.

scholarly journals Impact of Honeycomb Polylactide Infill% in FDM Printed PLA/Nylon for Improved Mechanical Properties

2020 ◽  
Vol 8 (5) ◽  
pp. 3662-3668
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Conventional Process ◽  
Improved Accuracy ◽  
Made In

In conventional manufacturing procedures liable upon the forces acting on the materials may lead to breakage during motion of the part undergoing construct which is inevitable to no change its shape and position. In pretty much every case, materials have anisotropic by its nature and virtue. As additive manufacturing (AM) techniques embedded undergoing processes with improved accuracy of the parts being developed. Since there is far disadvantage of the quality of the AM product, constantly improvements made the process of AM is being escalating than conventional process. The assessment of the product and the complexity of the parts can’t be resolved or found before it developing a methodology which impact mechanical properties of the printed parts. An effort has been made in the present work to improve the products mechanical properties by increasing the infill percentage. Study has been carried out as in view of increased infill with elaborated percentages of 15%, 30%, 40% and 50% to enhance the mechanical properties of the parts.

scholarly journals Study of the effect of institutional ownership on accounting quality and cost of capital

2021 ◽  
Vol 9 (SPE2) ◽  
Author(s):  
Reza Fallah
Keyword(s):  
Significant Relationship ◽  
Cost Of Capital ◽  
Accounting Information ◽  
Institutional Ownership ◽  
Test Results ◽  
Accounting Quality ◽  
Quality Of Accounting Information ◽  
The Relationship

The test results of the research hypotheses showed that there is a significant relationship between institutional ownership and quality of accounting information and cost of capital debt, but institutional ownership has not been able to moderate the relationship between quality of accounting information and cost of capital debt.

scholarly journals LABORATORY PRODUCTION OF HERB-MATE (ILEX PARAGUARIENSIS) FOR HOT MATE – A PARALLEL WITH THE CHARACTERISTICS OF PRODUCTS AVAILABLE ON THE MARKET

2019 ◽  
Vol 16 (32) ◽  
pp. 34-41
Author(s):  
Guilherme Rufatto SCHMIDT
Keyword(s):  
Inductively Coupled Plasma ◽  
Cadmium Concentration ◽  
Optical Emission ◽  
Raw Material ◽  
Emission Spectrometry ◽  
Ilex Paraguariensis ◽  
Inductively Coupled ◽  
Lead And Cadmium ◽  
Plasma Optical Emission Spectrometry ◽  
Made In

Herb-mate is a raw material of great importance to Southern Brazil, considering its annual production of approximately 650,000 tons of leaves. The hot mate, known as chimarrão, is the most appreciated beverage and its consumption is linked to the traditions and cultural habits predominantly in the south of the country. Considering its huge importance, the objective of the work was to evaluate the production of laboratory herbmate for chimarrão in order to establish a comparison with the products available on the market. Therefore, it was considered the current legislation and the analysis of its organoleptic and granulometric properties, humidity level and concentration of some toxic metals quantified by inductively coupled plasma optical emission spectrometry. The manufacturing of the final product was made in three steps: first of all, the leaves were submitted to direct fire, then they were dried at a temperature of 40 Cº for 24 hours and, finally, they were ground in a knife mill for 10 minutes. The obtained results showed, in most of the analyzed characteristics, a great similarity between the laboratorial and commercial herb, obtaining approval from 90% of chimarrão consumers who participated in the organoleptic tests. However, the coloration was considered darker and can be explained by logistic problems between the plantation and the laboratory. There was also a divergence in the metals analysis, which showed a higher lead and cadmium concentration when compared to the herbs found on the supermarket shelves. Alarming numbers for consumers were found, since the commercial herbs pointed levels above the recommended for all analyzed metals, which indicate the urgent need for better inspection, as well as improved manufacturing practices of the final product and a better raw material cultivation.

The (re-)establishment of order: Disorder in the priestly understanding and in the teaching and acts of Jesus

2017 ◽  
Vol 114 (2) ◽  
pp. 166-175
Author(s):  
Mark E. Biddle
Keyword(s):  
Skin Diseases ◽  
Christian Theology ◽  
Raw Material ◽  
Objective Quality ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Concrete Reality ◽  
Legal Sense

While a biblical doctrine of sin requires the honest and careful assessment of the complexity and plurality of the biblical witness,2 especially with regard to the relationship of the two Testaments, scholarship often draws lines of demarcation between the two Testaments too sharply. Ancient Israel’s priests devoted significant attention to the “objective” quality of wrong done as a pastoral problem, for example. Leviticus establishes that “unintentional sin” covers the whole gamut of behaviors short of willful sin that can result in terrible injury and harm. Indeed, the priests so consistently held the notion that wrong inheres in a situation, regardless of the intention of the actor, that they could use the language of sin to discuss skin diseases (Lev 14:1–32) and mold in houses (Lev 14:33–53). Israel’s priests did not speculate as to the precise point along the spectrum of willfulness and inadvertence at which one becomes morally culpable in the legal sense. Instead, their approach was much more pastoral: whatever the psychological and ethical dynamics preceding and underlying a wrong, the priests saw their role primarily in terms of healing, restoration, and restitution. Jesus and James expanded the priestly notion of sin as an objective reality to include intention as a category in the discussion of sin, but did not make it definitive of sin. Although the Gospels preserve no other discourse of Jesus even impinging on the subject of the concrete reality of sin, Jesus’ behaviors, especially instances when he healed without assigning blame or seeking repentance first, manifest his priestly concern for correcting inherent wrongness, for restoring rightness. Following Jesus, the priests’ view that any disorder threatens the harmony of the cultic community can supply useful and pertinent raw material for Christian theology and ethics today.

scholarly journals Narrative medicine in medical diagnosis

2020 ◽  
pp. 1-5
Author(s):  
Raúl Pino Andrade
Keyword(s):  
Interpersonal Relationships ◽  
Teaching And Learning ◽  
Narrative Medicine ◽  
Medical Field ◽  
History Of ◽  
The Relationship ◽  
Historical Periods ◽  
A Current ◽  
Made In

Modernity has brought with it a series of scientific advances that, in the medical field, have improved not only the diagnosis and treatment of diseases, but also the quality of life of patients. This is undeniable. It is enough to carry out an exercise of imagination and place our life in two different historical settings: first the Renaissance, and second the XXI century or contemporary era. Leaving cultural or historical affinities aside, to the question: In which of these historical periods would you like to live? The most prudent answer is very likely: now, in this century. The advances of medicine can be traced historically, we cannot think about it without thinking in Vesalius, or Paré, and many others; however, it is true that the history of medicine accelerated markedly in the 20th century. Although it is true that in just over a hundred years the greatest scientific discoveries have been made in all fields of knowledge, modernity has also meant a change in time itself. Everything unfolds at previously unimaginable speeds: material and knowledge production, teaching and learning, communication and interpersonal relationships. The latter point should be highlighted, and the changes due to the acceleration of the relationship between doctors and their patients should be pointed out on time. It is as if life should climb the assembly line and obey a Fordist logic. It must be recognized that the acceleration of certain aspects is significant, such as the expansion of diagnostic tests, creation of procedures and medications, immediate response to emergencies, among others. But all these advantages seem to carry with them, as a current, all areas of life including what must necessarily be paused.

Influence of Storage Conditions on Quality of Fly Ashes

2014 ◽  
Vol 1000 ◽  
pp. 59-62
Author(s):  
Hana Kalousová ◽  
Eva Bartoníčková ◽  
Tomáš Opravil
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Storage Conditions ◽  
Fly Ashes ◽  
Volume Stability ◽  
Stock Pile ◽  
Long Time ◽  
Made In

The presented paper deals with the issue of influence of storage conditions on the quality of conventional fly ashes which are produced by combustion of lignite. These ashes were stockpiled for long time. A borehole for sampling was made in the fly ash stock-pile. Total depth of the borehole was 20 m. Samples of fly ashes taken from every single meter were analyzed and next mechanical properties and the volume stability of materials containing these fly ashes were tested. The quality of fly ashes especially with respect to the possibility to use them as components of pastes, mortars and concretes as pozzolanic admixture or fine filler was evaluated.

scholarly journals The Relationship of Nutritive Value of Condensed Fish Solubles to Quality of Raw Material

1949 ◽  
Vol 28 (1) ◽  
pp. 134-140 ◽  
Author(s):  
S. Lassen ◽  
E.K. Bacon ◽  
H.J. Dunn
Keyword(s):  
Nutritive Value ◽  
Raw Material ◽  
Relationship Of ◽  
The Relationship
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