scholarly journals ESTIMATE OF THE COST OF PRODUCING NITROGEN 15 BY CHEMICAL EXCHANGE: AMMONIA- AMMONIUM CARBONATE SYSTEM USING CALCIUM HYDROXIDE REFLUX ASSUMING LOSSES OF 0.001 AT EACH REFLUX POINT

1956 ◽  
Author(s):  
B.B. Klima ◽  
W.T. Ward
Keyword(s):  
Calcium Hydroxide ◽  
Ammonium Carbonate ◽  
Chemical Exchange ◽  
Carbonate System ◽  
The Cost

scholarly journals Performance of a Fly Ash Geopolymeric Based Binder with Calcium Hydroxide, Portland Cement and Metakaolin as Additives

2018 ◽  
Vol 12 (1) ◽  
pp. 167-186 ◽  
Author(s):  
M. Kheradmand ◽  
Z. Abdollahnejad ◽  
F. Pacheco-Torgal
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Portland Cement ◽  
Calcium Hydroxide ◽  
Circular Economy ◽  
Cost Efficiency ◽  
Efficient Solution ◽  
Mixed Design ◽  
Cost Efficient ◽  
The Cost

Background:Geopolymeric binders are especially indicated when reusing a wide diversity of wastes. This is an important feature, especially in the European context, in which a circular economy and future zero waste are targeted. Still, the cost of these materials, due to the use of high purity activators, prevents their commercialization as they are simply not competitive enough.Objective:The reduction in the amount of activators could be a cost-efficient solution if the associated decrease in the mechanical properties turned not to be excessive. This means that it is important to investigate the manner in which these additives can be used on their composition in order to compensate that mechanical reduction.Results and Conclusion:This paper discloses results concerning the mixed design of fly ash based geopolymeric mixtures using metakaolin, Portland cement (OPC) and calcium hydroxide as additives. Their influence on the mechanical properties, microstructure and cost-efficiency was studied. The results showed that the use of Portland cement as an additive leads to lower compressive strength. Results also show that geopolymers with different additives have different optimum Na2SiO3/NaOH ratios.

Stack-Ammoniation of Mature Forages using Ammonium Salts. The AGRI-AM Process

1986 ◽  
Vol 1986 ◽  
pp. 10-10
Author(s):  
V. C. Mason ◽  
J. E. Cook ◽  
T. Smith ◽  
J. W. Siviter ◽  
A. S. Keene ◽  
...  
Keyword(s):  
Ammonium Sulphate ◽  
Ammonium Carbonate ◽  
Aqueous Ammonia ◽  
Ammonium Salts ◽  
Similar Response ◽  
Alternative Source ◽  
Safe Alternative ◽  
Slaked Lime ◽  
The Cost

In many regions, ammoniation of straw is hindered by the cost or non-availability of anhydrous or aqueous ammonia and by poor upgrading responses with urea. Ammonium salts constitute a safe, alternative source of ammonia. In vitro studies have shown that ammonia produced by heating ammonium ‘carbonate’ (mixture of the carbamate and bicarbonate) or bicarbonate to 90°C for 15 h with water produced improvements in the digestibility of straw which were similar to those achieved with aqueous ammonia. Under identical conditions ammonium sulphate gave a similar response only when reacted with a stoichiometric excess of quicklime (CaO) or slaked lime (Ca(OH)2 ) and water to produce ammonia. When the straw was treated at 20°C for 35 d, upgrading was achieved only when the volatile or non-volatile ammonium salts were mixed with an excess of CaO or Ca(OH)2 plus water.

scholarly journals TRATAMIENTO CON PASTA ENDODONTICA UNA– PUNO

2014 ◽  
Vol 16 (01) ◽  
Author(s):  
MARCO HERMINIO MANZANEDA PERALTA ◽  
PAOLA MANZANEDA PEÑA ◽  
ALINA MANZANEDA PEÑA
Keyword(s):  
Zinc Oxide ◽  
Calcium Hydroxide ◽  
Low Income ◽  
Adverse Reactions ◽  
Deciduous Teeth ◽  
Palabras Clave ◽  
Different Types ◽  
Bacteriostatic Agent ◽  
The Cost

<h4 class="text-primary">Resumen</h4><p style="text-align: justify;">Existen diferentes tipos de pastas endodonticas, que son escasas en el mercado, ya sea por la falta de conocimiento del odontólogo o por su dudosa respuesta al tratamiento. La investigación pretendió cubrir la falencia citada; previo consentimiento libre e informado de los 50 pacientes que llegaron al consultorio se le aplicó la fórmula de pasta endodontica UNA PUNO preparada localmente, utilizando eugenol y paramonoclorofenol alcanforado (líquidos) y por otro lado la acción sólida iodoformo, tetraciclina, óxido de zinc, hidróxido de calcio (para piezas dentarias caducas), de abril a octubre del 2013. En el periodo de tratamiento y seguimiento se les tomó radiografías para ver que no haya ninguna reacción adversa en el tratamiento realizado. A comparación con otras PASTAS ENDODONTICAS, el producto aplicado actuó como agente anti bacteriana y bacteriostático que van a destruir los residuos microbianos. Los resultados obtenidos son determinantes al haberse conformado el campo aséptico y ser más efectiva y económica a comparación de otros, bajando el costo de tratamiento endodontico y de mayor acceso a la población de escasos recursos económicos.</p><p style="text-align: justify;"><strong>PALABRAS CLAVE: </strong>* pasta endodontica * UNA-PUNO * hidróxido de calcio * yodoformo * tetraciclina * oxido de zinc * eugenol</p><h4 class="text-primary">ABSTRACT</h4><p><strong>TREATMENT WITH ENDODONTIC TOOTHPASTE UNA-Puno</strong></p><p style="text-align: justify;">There are different types of endodontic pastes, which are scarce in the market, either by dentists’ lack of knowledge of the pastes existence orbecause of unknown effects of treatment on the patient. This research aimed to cover the knowledge gap discussed here. Prior the informed consent of the 50 patients who came to the clinic. We applied endodontic paste formula «UNA Puno» prepared locally using eugenol and camphor paramonochlorophenol (liquid) and secondly the solid iodoform reaction, tetracycline, zinc oxide, calcium hydroxide (for deciduous teeth). In the treatment period and follow-up, radiographs were taken to ensure no adverse reactions to the treatment. In comparison with other endodontic pastes, the product presented acts asan anti bacterial and bacteriostatic agent that destroys microbial residues. The obtained results are crucial, having defined an aseptic space; proven more effective and economical compared to other pastes. This lowers the cost of endodontic treatment while giving greater access to low-income populations.</p><p style="text-align: justify;"><strong>KEY WORDS: </strong>* endodontic paste * «UNA-Puno» * calcium hydroxide * iodoform * tetracycline * zinc oxide * eugenol</p>

The Ammonia-Ammonium Carbonate System for the Concentration of Nitrogen-15

1956 ◽  
Vol 60 (1) ◽  
pp. 48-51 ◽  
Author(s):  
G. M. Begun ◽  
A. A. Palko ◽  
L. L. Brown
Keyword(s):  
Ammonium Carbonate ◽  
Carbonate System

The IBM-PC in electron microscopy

1996 ◽  
Vol 54 ◽  
pp. 612-613
Author(s):  
James F. Mancuso
Keyword(s):  
Head Start ◽  
Image Acquisition ◽  
Cost Effective ◽  
Financial Applications ◽  
Number Of Factors ◽  
Instrument Control ◽  
The Cost ◽  
Training And Support ◽  
Control Image ◽  
Ibm Pc

IBM PC compatible computers are widely used in microscopy for applications ranging from control to image acquisition and analysis. The choice of IBM-PC based systems over competing computer platforms can be based on technical merit alone or on a number of factors relating to economics, availability of peripherals, management dictum, or simple personal preference.IBM-PC got a strong “head start” by first dominating clerical, document processing and financial applications. The use of these computers spilled into the laboratory where the DOS based IBM-PC replaced mini-computers. Compared to minicomputer, the PC provided a more for cost-effective platform for applications in numerical analysis, engineering and design, instrument control, image acquisition and image processing. In addition, the sitewide use of a common PC platform could reduce the cost of training and support services relative to cases where many different computer platforms were used. This could be especially true for the microscopists who must use computers in both the laboratory and the office.

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