scholarly journals RATIONAL USE OF NATURAL RESOURCES AND RESOURCE CONSERVATION IN THE PRODUCTION OF BUILDING MATERIALS

2021 ◽  
Vol 82 (4) ◽  
pp. 89-100
Author(s):  
K.A. Akmalaev ◽  
◽  
R.E. Nurlybaev ◽  
Ye.S. Orynbekov ◽  
◽  
...  
Keyword(s):  
Portland Cement ◽  
Natural Resources ◽  
Water Purification ◽  
Periodic Table ◽  
Building Materials ◽  
Resource Conservation ◽  
Industrial Water ◽  
Natural Zeolites ◽  
Sodium Potassium ◽  
Potassium Magnesium

The problem of using natural zeolites and utilization of spent sorbents-zeolites used in industrial water purification processes is considered. The promising possibility of their use as additives in the production of cement and concretes, as additives to Portland cement, is shown. Zeolites are crystalline aqueous aluminosilicates containing as cations elements I and II groups of the periodic table, in particular sodium, potassium, magnesium, calcium, strontium, and barium.

scholarly journals Ethnobotany of Bamboo in Sangirese, North Celebes

2017 ◽  
Vol 9 (1) ◽  
pp. 81
Author(s):  
Alin Liana ◽  
Purnomo Purnomo ◽  
Issirep Sumardi ◽  
Budi Setiadi Daryono
Keyword(s):  
Natural Resources ◽  
Building Materials ◽  
Local Community ◽  
Ornamental Plants ◽  
Resource Conservation ◽  
Musical Instruments ◽  
National Strategy ◽  
Germplasm Resource ◽  
Growth Of A Variety ◽  
The People

<p>Advances in technology have encouraged the growth of a variety of biodiversity processing methods. These conditions encourage efforts to use natural resources more broadly. Ethnobotany can be used to document the local knowledge of the plants and their utilization. This study is aimed to describe the various forms of bamboo utilization by Sangirese. The method used was survey with purposive sampling. The data were analyzed descriptively based on exploration results and interviews with the people. The results showed there were 11 species of bamboo that are directly related to the life of local community in Sangirese, consisting of seven species of <em>Bambusa</em>, three species of <em>Schizostachyum</em>, and each one species of <em>Dendrocalamus </em>and <em>Gigantochloa</em>. Local community use bamboo for a variety of daily necessities; as building materials, handicraft, furniture, ceremonies, musical instruments, transportation, medicine, ornamental plants, as well as food. These exploration results are expected to complement the data of bamboo ethnobotany in Indonesia. Applicatively, this research is expected to be a reference in the national strategy of bamboo germplasm resource conservation.</p>

scholarly journals INFLUENCE OF THE METHOD OF INTRODUCING ORGANOMINERAL ADDITIVE IN CONSTRUCTION SOLUTIONS 

2019 ◽  
Author(s):  
Х-М. М. Вахажи ◽  
З.Х. Исмаилова ◽  
А.С. Успанова
Keyword(s):  
Natural Resources ◽  
Environmental Pollution ◽  
Building Materials ◽  
Raw Materials ◽  
Environmental Safety ◽  
Resource Conservation ◽  
Technogenic Raw Materials ◽  
Technology Of Production

Использование техногенного сырья в производстве строительных растворов является актуальным направлением в технологии производства строительных материалов. Экологическая безопасность производства строительных материалов, возможности их переработки и утилизации диктуется необходимостью энерго- ресурсосбережения, ограниченностью природных запасов и массовым загрязнением окружающей среды. The use of technogenic raw materials in the production of mortars is an urgent area in the technology of production of building materials. The environmental safety of the production of building materials, the possibility of their processing and disposal is dictated by the need for energy and resource conservation, limited natural resources and massive environmental pollution.

Methods of Investigating and Quality Assessing Structure of Concretes with Combined Aggregates

2018 ◽  
Vol 931 ◽  
pp. 618-623
Author(s):  
Elena A. Shlyakhova ◽  
Inna O. Egorochkina ◽  
Irina A. Serebryanaya ◽  
A.A. Matrosov
Keyword(s):  
Portland Cement ◽  
Environmental Protection ◽  
Concrete Structure ◽  
Building Materials ◽  
Resource Conservation ◽  
Raw Material ◽  
Material Base ◽  
Structure And Properties ◽  
Crushed Concrete

Concrete on Portland cement and cement modified with expanding additives were studied. The authors present the results of study of the modified concrete with combined aggregate. Combined aggregate is a composition of natural granite and limestone crushed stone mixed with crushed concrete. Structure and properties of concrete with combined aggregate is insufficiently studied, which limits their use in civil engineering Recycling of building materials allows to expand the raw material base, to solve the problems of resource conservation and environmental protection. The regularities and causes of changes (reduction) indicators of the quality of concrete with combined aggregate. Studying of properties and laws of formation of structure of concrete at the same time is a method of control of their production. The valuation of properties of concrete with combined aggregates will allow to use them along with traditional concrete.

scholarly journals Metal Binding Proteins

Encyclopedia ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 261-292
Author(s):  
Eugene A. Permyakov
Keyword(s):  
Metal Ions ◽  
Metal Binding ◽  
Transition Metal Ions ◽  
Short Review ◽  
Sodium Potassium ◽  
Physical Chemical ◽  
Physiological Properties ◽  
Cell Processes ◽  
Living Organisms ◽  
Potassium Magnesium

Metal ions play several major roles in proteins: structural, regulatory, and enzymatic. The binding of some metal ions increase stability of proteins or protein domains. Some metal ions can regulate various cell processes being first, second, or third messengers. Some metal ions, especially transition metal ions, take part in catalysis in many enzymes. From ten to twelve metals are vitally important for activity of living organisms: sodium, potassium, magnesium, calcium, manganese, iron, cobalt, zinc, nickel, vanadium, molybdenum, and tungsten. This short review is devoted to structural, physical, chemical, and physiological properties of proteins, which specifically bind these metal cations.

scholarly journals Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2291
Author(s):  
Alessandro P. Fantilli ◽  
Daria Jóźwiak-Niedźwiedzka
Keyword(s):  
Environmental Impact ◽  
Portland Cement ◽  
Building Materials ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Special Issue ◽  
Cement Production ◽  
Concrete Part

The environmental impact of the Portland cement production and the large use of cement-based building materials is a growing problem [...]

The effect of dehydration and rehydration on salt loss in the second-stage larvae of Anguina tritici

Parasitology ◽  
1981 ◽  
Vol 82 (3) ◽  
pp. 411-419 ◽  
Author(s):  
C. Womersley
Keyword(s):  
Salt Content ◽  
Atomic Absorption Spectrophotometry ◽  
Sodium Content ◽  
Sodium Potassium ◽  
X Ray ◽  
Second Stage ◽  
Absorption Spectrophotometry ◽  
Nematode Cuticle ◽  
Calcium Loss ◽  
Potassium Magnesium

SUMMARYThe effect of repeated dehydration and hydration on the salt content of 2nd-stage larvae of Anguina tritici was studied. The sodium, potassium, magnesium and calcium contents of the larvae after subjection to varying periods of desiccation and rehydration were determined with atomic absorption spectrophotometry and flame photometry. External cation concentrations on the cuticle of the head, middle body and tail regions were determined semi-quantitatively with scanning electron microscopy in conjunction with X-ray analysis (EDAX). Salt concentrations decreased with each dehydration/rehydration cycle. The greatest loss occurred on revival from the first desiccation period. The results indicated that A. tritici was incapable of regulating it's internal sodium content during revival, but suggested a limited ability to control potassium, magnesium and calcium loss. Salt loss through the nematode cuticle was restricted to potassium and calcium during desiccation. The salt losses encountered are discussed in relation to nematode osmoregulation and to the survival of the nematode in the anhydrobiotic state.

Natural Resources, Sustainability, and Intergenerational Ethics

2021 ◽  
Author(s):  
Chris Armstrong
Keyword(s):  
Natural Resources ◽  
Natural Resource ◽  
Global Justice ◽  
Resource Conservation ◽  
Natural Resource Conservation ◽  
The Future ◽  
Intergenerational Ethics

This chapter examines a variety of views about the nature of society’s putative duty to conserve natural resources for the future, with a focus on the contested idea of sustainability. This chapter examines competing conceptions of sustainability and their implications for natural resource conservation across generations. Sustainability is a very popular concept, but there are many different positions on what might be called the “sustainability of what?” question. The chapter examines a number of competing views and shows how controversy here has informed the debate between so-called weak and strong conceptions of sustainability. It concludes with an examination of the politics of sustainability, and in particular the connections and possible tensions between goals of natural resource conservation and of global justice.

Utilization of Circulating Fluidized Bed Combustion (CFBC) Fly Ash and Coal-Fired Fly Ash in Portland Cement

2014 ◽  
Vol 629-630 ◽  
pp. 306-313 ◽  
Author(s):  
Mao Chieh Chi ◽  
Ran Huang ◽  
Te Hsien Wu ◽  
Toun Chun Fou
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Fluidized Bed ◽  
Building Materials ◽  
Circulating Fluidized Bed ◽  
Setting Time ◽  
Fluidized Bed Combustion ◽  
Initial Setting Time ◽  
Cfbc Fly Ash ◽  
Circulating Fluidized Bed Combustion

Circulating fluidized bed combustion (CFBC) fly ash is a promising admixture for construction and building materials due to its pozzolanic activity and self-cementitious property. In this study, CFBC fly ash and coal-fired fly ash were used in Portland cement to investigate the pozzolanic and cementitious characteristics of CFBC fly ash and the properties of cement-based composites. Tests show that CFBC fly ash has the potential instead of cementing materials and as an alternative of pozzolan. In fresh specimens, the initial setting time of mortars increases with the increasing amount of cement replacement by CFBC fly ash and coal-fire fly ash. In harden specimens, adding CFBC fly ash to replace OPC reduces the compressive strength. Meanwhile, CFBC fly ash would results in a higher length change when adding over 30%. Based on the results, the amount of CFBC fly ash replacement cement was recommended to be limited below 20%.

scholarly journals The digestion process of the sugar alcohol isomalt in the intestinal tract of the pig

1993 ◽  
Vol 69 (2) ◽  
pp. 467-479 ◽  
Author(s):  
E. J. Van Weerden ◽  
J. Huisman
Keyword(s):  
Small Intestine ◽  
Dry Matter ◽  
Intestinal Tract ◽  
Live Weight ◽  
Feed Consumption ◽  
Slight Reduction ◽  
Sodium Potassium ◽  
Bacterial Fermentation ◽  
Digestion Process ◽  
Potassium Magnesium

In a study with ten pigs of 60–70 kg live weight, provided with a re-entrant cannula at the end of the ileum, and sixteen intact, non-cannulated pigs, the digestion and absorption of a dietary dose of 100 g isomalt/kg, and isomalt given between the meals as a ‘sweet’on the basis of 50 and 100 g/kg feed consumption, were examined. In all three isomalt treatments slightly less than 0.40 of the isomalt consumed was digested in the small intestine when the calculations were based on ileal sugar passage. However, when basing the calculations on energy contents of ileal chyme, only approximately 0.10 was digested in the small intestine. The bacterial fermentation of the isomalt flowing into the large intestine was indicated by a decreased faecal energy digestibility and a slight reduction in faecal dry matter and nitrogen digestibility. The retention of the minerals sodium, potassium, magnesium, calcium and phosphorus was not influenced to any measurable extent when isomalt was fed.

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