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The Best Periodic Table Of The Elements

Jiang Chun-xuan

P. O. Box 142-206, Beijing 100854, P. R. China

j136211668701@163.com

Abstract: Using the stable number theory[3] we make the best periodic table of the elements and obtain the best electron configurations of the elements.

[Jiang Chun-xuan. The Best Periodic Table Of The Elements. Rep Opinion 2025;17(11):1-9]. ISSN 1553-9873 (print); ISSN 2375-7205 (online). http://www.sciencepub.net/report. 01. doi:10.7537/marsroj171125.01

Keywords: Best; Periodic Table; Elements; electron configuration

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Review on the Economic Impact of Foot and Mouth Disease (FMD)

Wubshet Nasir

South Wollo Livestock Resource Office

Abstract: Foot and mouth disease is considered as the most important livestock disease in the world in terms of its economic impact. It is endemic in many African countries including Ethiopia. The economic impact of the disease in endemic country is that it leads the loss of milk production; loss of draft power; retardation of growth; abortion and delayed breeding and mortality especially in young animals. It also leads market restrictions, use of suboptimal production technologies and costs of control. The severity of the impact varies from country to country based on their disease control strategy.

[Wubshet Nasser. Review on the Economic Impact of Foot and Mouth Disease (FMD). Rep Opinion 2025;17(11):10-14]. ISSN 1553-9873 (print); ISSN 2375-7205 (online). http://www.sciencepub.net/report. 02. doi:10.7537/marsroj171125.02

Key words: FMD; economic impact

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REVIEW OF LITERATURE ON GEOLOGY OF SILICA SANDS

*AKOIJAM LINTHOI DEVI and **Dr. BHUVNESH KUMARI

*Research Scholar, Department of Earth Science, SunRise University, Alwar, Rajasthan (India)

**Associate Professor, Department of Earth Science, SunRise University, Alwar, Rajasthan (India)

Email: Linthoiakoijam2014@gmail.com

Abstract: Silica is the name given to a group of minerals composed of silicon and oxygen, the two most abundant elements in the earth's crust. Silica is found commonly in the crystalline state and rarely in an amorphous state. It is composed of one atom of silicon and two atoms of oxygen resulting in the chemical formula SiO2. Sand consists of small grains or particles of mineral and rock fragments. Although these grains may be of any mineral composition, the dominant component of sand is the mineral quartz, which is composed of silica (silicon dioxide). Other components may include aluminum, feldspar and iron-bearing minerals. Sand with particularly high silica levels that is used for purposes other than construction is referred to as silica sand or industrial sand. Two general types of sand: 1-Naturally bonded (bank sand) 2-synthetic (lake sand) For a particular source of sand to be suitable for glassmaking, it must not only contain a very high proportion of silica but also should not contain more than strictly limited amounts of certain metallic elements. Silica sand is also normally required to be well-sorted, i.e. to have grains of an approximately uniform size. Most sources of sand used by the construction industry do not satisfy these requirements and are not, therefore, suitable for glassmaking. Industrial uses of silica sand depend on its purity and physical characteristics. Some of the more important physical properties are: grain size and distribution, grain shape, sphericity, grain strength and refractoriness.

[AKOIJAM LINTHOI DEVI and BHUVNESH KUMARI. REVIEW OF LITERATURE ON GEOLOGY OF SILICA SANDS. Rep Opinion 2025;17(11):15-19]. ISSN 1553-9873 (print); ISSN 2375-7205 (online). http://www.sciencepub.net/report. 03. doi:10.7537/marsroj171125.03

Keywords: REVIEW OF LITERATURE; GEOLOGY; SILICA SANDS

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UNIAXIAL COMPRESSIVE STRENGTH OF REACTIVE SILICA SAND POWDER CONCRETE (RSSPC)

Hossein Kabir ^a

^a Department of Civil Engineering, Sharif University of Technology, Tehran, Iran.

E-mail address:kabir_hussein@dena.sharif.edu

Tel.: +98 2164543000

Abstract: Silica sand powder concrete is a concrete with actually no coarse material in its own composition. In this concrete the only aggregate is silica powder and its size is less than 150 mm which is classified as ultra-fine aggregate concrete. The research interest is to find the compressive strength of this particular concrete under different conditions of curing and consolidation to compare each approach with each other. In this research, curing is being held under thermal accelerated curing (in the oven, exposed to humidity) and normal curing (in lime-water) in which the samples are compacted either by pressing or vibrating.

[Hossein Kabir. UNIAXIAL COMPRESSIVE STRENGTH OF REACTIVE SILICA SAND POWDER CONCRETE (RSSPC). Rep Opinion 2025;17(11):20-28]. ISSN 1553-9873 (print); ISSN 2375-7205 (online). http://www.sciencepub.net/report. 04. doi:10.7537/marsroj171125.04

Keywords: Reactive Silica Sand Powder Concrete (RSSPC); Consolidation; Compressive Strength; Normal Curing, Thermal Accelerated Curing

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