Magnesia Binder Preparation from Local Natural and Technogenic Raw Materials

The preparation of magnesia binders based on natural and technogenic mineral was the result of the research. The obtained magnesia binders possess the increased flexural and compressive strength which values are close to ones of natural materials. High flexural and compression strengths are associated with the features of the hardened caustic dolomite containing magnesium oxyhydrochlorides which crystallize as a fiber. The fibrous crystals not only increase the cement strength, but also act as a reinforcing material. The resulting magnesia binder does not require a moist environment at hardening. It is characterized by decorativeness and ecological compatibility, has a neutral hardening product composition

Magnesia Binder Preparation from Local Natural and Technogenic Raw Materials

The preparation of magnesia binders based on natural and technogenic mineral was the result of the research. The obtained magnesia binders possess the increased flexural and compressive strength which values are close to ones of natural materials. High flexural and compression strengths are associated with the features of the hardened caustic dolomite containing magnesium oxyhydrochlorides which crystallize as a fiber. The fibrous crystals not only increase the cement strength, but also act as a reinforcing material. The resulting magnesia binder does not require a moist environment at hardening. It is characterized by decorativeness and ecological compatibility, has a neutral hardening product composition

Chemical modification of cellulose for boron sorption from water solutions

It is shown that natural cellulose obtained from the walnut shell (Juglans regia) can be used for chemical modifi cation of the selective boron sorbent. The modifi cation was carried out by the coupling technique of chlorine derivatives of the polyhydric alcohols or polyols (mannitol, xylitol, sorbitol or glycerol). In this case new hybrid substances (sorbents) were obtained and they are represented by the formula: R-O-(CHOH)n-CH3, where R is a residue of the cellulose backbone, n is the number of functional (OH) groups of the polyhydric alcohols. The pulp mercerization was carried out by processing the ground walnut shell (WS) with hot solution of sodium hydroxide. Chlorination of polyhydric alcohols was carried out by gaseous hydrochloric acid sparging through the polyhydric alcohol aqueous solution. The coupling process proceeds according to the mechanism of substitution of the cellulose hydroxyl groups with chlorine atoms

Evaluation of the Somatotype of Patients with Class 1, 2 and 3 Obesity According to the Heath-Carter Scheme Using Various Formulas

AIM. The purpose of this work was to study the somatotypological characteristics of patients with non-communicable diseases and obesity of class 1, 2 and 3; compare three methods to evaluate the somatotype using three types of complex formulas according to the Heath-Carter scheme; to check the reliability and informativeness of the method of bioimpedance evaluation of somatotype components by regression formulas used in bioimpedance analysis. MATERIAL AND METHODS. 145 patients (67 men, mean age 41.4±10.3 years and 78 women, mean age 40.6±9.4 years) with class 1, class 2 and class 3 obesity, were examined at the clinic of the Federal Research Center of Nutrition and Biotechnology. Anthropometric measurements were taken. Bioimpedance evaluation of body composition was performed using the analyzer ABC-01 "Medas". The somatotype was determined according to the Heath-Carter scheme using three types of complex formulas – based on anthropometry and based on a bioimpedance study of body composition. RESULTS AND DISCUSSION. Based on anthropometric and bioimpedance studies, a characterization of somatotypes according to the Heath-Carter scheme in patients with alimentary-dependent pathologies and class 1, class 2 and class 3 obesity is presented. Significant differences were shown in the values of the somatotype components ENDO and MESO, obtained by calculation using the formulas implemented in the software of the bioimpedance analyzer, from the values obtained by calculating by formulas based on anthropometry. CONCLUSION. The degree of gender dimorphism was different when determining the somatotype according to the Heath-Carter scheme in patients with class 1, class 2 and class 3 obesity, and it depended on what particular formulas were used to calculate the scores. Pronounced gender dimorphism was noted when using both versions of the regression formulas, because they take into account the gender of the individual being examined. It was shown that these formulas are not applicable for evaluation of the components of the somatotype in persons with obesity of class 1, class 2 and class, because the coefficients of determination do not correspond to those previously obtained for a group of people with normal BMI values. We consider it expedient to develop new regression equations for evaluation of the somatotype of the above category of patients