Calculation of the close packing of fine aggregate on the basis of screening for fine grained concrete

The paper considers the calculation of the maximum packing density of fine aggregate. The selection of the granulometric composition of the aggregate is given. The bulk densities and packing densities of standard screening fractions were determined. The content of each fraction in the mixture and the packing density of the aggregate mixture are calculated by the introduction of a subsequent finer fraction. Topological calculation of sandstone screening was performed. The results of sieving of sandstone screening are presented. The high-density grain composition of aggregate for fine-grained concrete is obtained. The compositions of concrete mixtures have been designed. The volume ratio of aggregate and cement paste in the concrete mix, the average mass size of the aggregate grains in the mixture, the volume fractions of cement and water in the concrete mixture are determined. The physicomechanical characteristics of fine-grained concrete of various compositions with a high density aggregate are shown. Results of testing the control samples for compressive strength are given. The density of the obtained samples was determined. Conclusions are drawn on the work.Keywords: Fine-grained concrete, fine aggregate, granulometry, screenings, sandstone, highdensity aggregat

The interrelation between temperature regimes and fish size in juvenile Atlantic cod (Gadus morhua): effects on growth and feed conversion efficiency

The present paper describes the growth properties of juvenile Atlantic cod (Gadus morhua) reared at 7, 10, 13 and 16 °C, and a group reared under “temperature steps” i.e. with temperature reduced successively from 16 to 13 and 10 °C. Growth rate and feed conversion efficiency of juvenile Atlantic cod were significantly influenced by the interaction of temperature and fish size. Overall growth was highest in the 13 °C and the T-step groups but for different reasons, as the fish at 13 °C had 10% higher overall feeding intake compared to the T-step group, whereas the T-step had 8% higher feeding efficiency. After termination of the laboratory study the fish were reared in sea pens at ambient conditions for 17 months. The groups performed differently when reared at ambient conditions in the sea as the T-step group was 11.6, 11.5, 5.3 and 7.5% larger than 7, 10, 13 and 16 °C, respectively in June 2005. Optimal temperature for growth and feed conversion efficiency decreased with size, indicating an ontogenetic reduction in optimum temperature for growth with increasing size. The results suggest an optimum temperature for growth of juvenile Atlantic cod in the size range 5–50 g dropping from 14.7 °C for 5–10 g juvenile to 12.4 °C for 40–50 g juvenile. Moreover, a broader parabolic regression curve between growth, feed conversion efficiency and temperature as size increases, indicate increased temperature tolerance with size. The study confirms that juvenile cod exhibits ontogenetic variation in temperature optimum, which might partly explain different spatial distribution of juvenile and adult cod in ocean waters. Our study also indicates a physiological mechanism that might be linked to cod migrations as cod may maximize their feeding efficiency by active thermoregulation

A method to measure the resonance transitions between the gravitationally bound quantum states of neutrons in the GRANIT spectrometer

We present a method to measure the resonance transitions between the gravitationally bound quantum states of neutrons in the GRANIT spectrometer. The purpose of GRANIT is to improve the accuracy of measurement of the quantum states parameters by several orders of magnitude, taking advantage of long storage of Ultracold neutrons at specula trajectories. The transitions could be excited using a periodic spatial variation of a magnetic field gradient. If the frequency of such a perturbation (in the frame of a moving neutron) coincides with a resonance frequency defined by the energy difference of two quantum states, the transition probability will sharply increase. The GRANIT experiment is motivated by searches for short-range interactions (in particular spin-dependent interactions), by studying the interaction of a quantum system with a gravitational field, by searches for extensions of the Standard model, by the unique possibility to check the equivalence principle for an object in a quantum state and by studying various quantum optics phenomena

Clinical Case of Listeria Meningitis

This article describes a case of listeria meningitis in a 41-year-old man. At the time of admission to hospital, the patient complained of fever, headache, vomiting, general weakness. An objective examination revealed cervical lymphadenopathy, meningeal signs (positive Kernig’s sign and doubtful rigidity of occipitals), with no focal symptoms. On the right hand it was revealed an abscess in the stage of healing. In the liquor we have detected: pleocytosis — 222 cells with a predominance of neutrophils — 73 %, рrotein — 0.49 g/l, the sugar level in the liquor is slightly reduced. During the bacteriological study of liquor we have isolated Listeria monocytogenes. Serological survey of blood serum using passive hemagglutination test and indirect hemagglutination test revealed levels of antibodies to Listeria monocytogenes — 1 : 800 and 3 (+), respectively

Experience of application of specialized food product of dietary therapeutic and dietary preventive nutrition in case of inflammatory diseases of gastrointestinal tract

Introduction. In almost all diseases of the gastrointestinal tract, the inflammatory process plays an important pathogenetic role and affects the course of the disease and the determination of treatment tactics. The most physiological way to prevent and treat inflammatory diseases of the gastrointestinal tract, of course, is dietary nutrition. Purpose: To study the anti-inflammatory effect of a specialized product specialized therapeutic and dietary prophylaxis nutrition «Vegetable soup with oatmeal herbs» based on a study of clinical and laboratory parameters and dynamics of inflammatory markers. Materials and methods. An open single-center prospective observational study was conducted in parallel groups. The main group and the comparison group were 14 and 10 patients with gastrointestinal diseases, respectively. Only patients of the main group received a specialized product «Vegetable Soup with herbs and oatmeal». All participants were assessed the dynamics of clinical blood analysis indicators (hemoglobin, white blood cells, red blood cells, leukocyte formula indicators) and the dynamics of proteinogram indicators (total protein and protein fractions-albumins and globulins) and C-reactive protein (CRP). Results. The anti-inflammatory effect after administration of the specialized product occurs in 14 days and is expressed in a reliable reduction of leukocytosis, blood sedimentation rate (BSR), CRP. After 2 months after the start of the product intake, the BSR values decreased significantly by 35%, the CRP by 51% from the baseline and the leukocyte content decreased by 14.5%. Against the background of a dietotherapy in 14 days levels α1-глобулина, α2-глобулина and γ-globulin began to decrease, and in 2 months level α1-globulins decreased by 40% of initial level to the reference values. The level of α2-globulins and γ-globulin also decreased significantly, while the albumin concentration in the blood increased significantly. In the comparison group, changes in these parameters did not reach a reliable degree of significance. Conclusions: the specialized product «Vegetable Soup with herbs and oatmeal» has an anti-inflammatory effect, characterized by a decrease in anti-inflammatory laboratory parameters, which manifests itself after 14 days of administration, can be recommended for inclusion in the diets of patients with gastrointestinal diseases during exacerbation and during remissions as well. © 2020, Remedium Group Ltd. All rights reserved