Rheological Characteristics of Loam Compositions with Mineral Additives of Different Genesis and Morfology

Structural clay products manufacturing is depends on the potential of local raw materials. Shoddy silty loams are the main component of molding mixtures in view of shortage of the quality clays. Therefore, methods for determining the structural characteristics of molding compounds are becoming important. The objective of study is the influence of mineral additives different genesis and morphology at structural characteristics and molding properties of the compounds based on shoddy silty loams. Photometrical sedimentometer FSH-6K and optical microscopy method were used for the determining of granulometric compositions and morphological properties of the additives. Conical rheometer method was used for the determining plastic strength of the moulding compounds. Shear plastometer method was used to determining values of the low elastic, high elastic and plastic deformations. It had defined the optimal values of molding clay compound’s moisture in which molding compositions had being tested. Optimal values of the molding composition’s moisture in which molding compounds has not subjected to negative influences of the gravitational water are equal to 15-19%. Structural constants were calculated for molding compositions based on different kinds of additives. Values of the percent of low elastic, high elastic and plastic deformation were calculated on the grounds of rheological curves. Optimal values of composition’s structural characteristics were accepted from the condition of three types of deformations

Cosmic ray modulation in a random anisotropic magnetic field

Inhomogeneities of the interplanetary magnetic field can be divided into small scale and large scale ones as may be required by the character of the problem of cosmic ray (CR) propagation. CR propagation in stochastic magnetic fields is of diffusion character. The main contribution into the scattering of CR particles is made by their interaction with inhomogeneities of the magnetic field H which have characteristic dimensions 1 of the order of Larmor radius R=cp/eH of particle (p is the absolute value of particle momentum, e is particle charge, c is velocity of light). Scattering of particles on such inhomogeneities leads to their diffusion mostly along a magnetic field with characteristic dimensions of variation in space exceeding the mean free path

Anomalous cyclotron mass dependence on the magnetic field and Berry’s phase in (Cd₁-x-γZnxMnγ)₃As₂ solid solutions

Shubnikov-de Haas (SdH) effect and magnetoresistance measurements of single crystals of diluted II-V magnetic semiconductors (Cd₁-x-γZnxMnγ)₃As₂ (x+γ= 0.4, y=0.04 and 0.08) are investigated in the temperature range T=4.2 ÷ 300 K and in transverse magnetic field B=0 ÷ 25

STUDY THE POSSIBILITY OF MODELING OF THE CUTTING PROCESS IN THE CHAMBER FOR CRUSHING FRUIT AND VEGETABLES

The grinding process of fruits and vegetables in the preparation of juice with pulp, usually carried out by means juicers, blenders or grinders with a relatively slowly rotating blades and stationary gratings with a continuous flow of raw materials. Intensification of processes of division of the products of the conversion will asunder allow sharply duration and raise the uniformity of the processing cheese that will say on quality ready drink as a whole. The interaction of the blade and material is characterized effort of the cutting moreover the general power, acting on blade on the part of material, is not found in planes of the cutting in consequence of which on blade of the knife, alongside with vertical, acts and horizontal forming power. Horizontal form to deform (change) sidebar cut-ting edge of the knife in consequence of which in general event provision to necessary acerbity in flat material requires increase of his(its) thickness and using the additional relationships (the jumper). It is installed that values of magnitude of deformation and speed of its extending are connected among themselves through the parameters characterizing pressure and plasticity of medium of installation of machining. Hence, speed depends on properties of a body in which the pulse is passed round. In the majority of materials speed of extending of a pulse appears an order of 5 103 km/s. Accounting of received data in the determination of rational cutting speeds for different materials with elastoplastic properties (approximation cutting speed for the propagation velocity of deformation) will allow to reduce pre-separation deformation and, respectively, spent on her work, localization stress under cutting edge, and, as consequence will lead to higher product yield and improve the purity of the slices. Improving the quality cutting may be associated with an increase of inertia of the structural elements of the material (fibers) by increasing the speed of the process

Assessment of Nutritive Status in Patients with Symptoms of Heart Failure

Aim of the research. To study the parameters of nutritional status of patients with acute and chronic coronary syndromes and symptoms of heart failure in conjunction with clinical, anthropometric, laboratory parameters, structural and functional characteristics of the heart. Materials and methods. A cross-sectional study of 106 patients with acute and chronic coronary syndromes and symptoms of heart failure. All subjects underwent an integrated assessment of the nutritional status (anthropometric, caliperometric (caliper metric) indicators, CONUT scale (lymphocytes, total cholesterol, albumin), hormonal indicators (N-terminal brain natriuretic propeptide), structural changes in the myocardium using echocardiography, exercise tolerance by 6-minute walk test. Results. Nutritional deficiency, according to CONUT scale, was found in 81.1 % of cases (86 patients). In the group of patients with the presence of malnutrition, there were significantly high level of fibrinogen and N-terminal brain natriuretic propeptide. The interpretation of changes in body composition showed a significant upward trend in the prognostic index of hypotrophy and a decrease in lean body mass as heart failure progresses. The dependence of nutritive insufficiency on the CONUT scale with laboratory parameters (creatinine, fibrinogen, brain natriuretic propeptide), structural and functional characteristics of the heart (diastolic and systolic dimensions of the left ventricle, ejection fraction, left ventricular myocardial mass index), a functional indicator of tolerance to the physical load (6-minute walk test) was determined. Conclusion. An integrated analysis of nutritional status indicators of patients with heart failure revealed an increase of malnutrition signs with an increase of the severity of HF. Pathological effects of nutritional deficiency are associated with impaired left ventricular systolic function, reduced exercise tolerance

EPR of Pb3+ ion in LiBaF3 crystals

Complex EPR spectra of paramagnetic centers Pb3+ formed in LiBaF3:Pb2+ crystals under X-ray irradiation are studied in the temperature range of 10-150 K. It is shown that lead ions substitute Ba2+ ions in the LiBaF3 crystal and are in the cubic-octahedral 12-fold environment of the fluorine ions. The hyperfine structure constants describing the observed spectrum are determined and parameters of superhyperfine interaction with the nearest fluorine ions are estimated. © Springer-Verlag 2006

Efficacy of Angio-Seal Device for Primary And Complicated Haemostasis: a Multicentre Retrospective Assay

Background. Femoral approach in endovascular surgery remains relevant being, however, associated with the risk of fatal and non­fatal complications. Modern techniques for instrumental haemostasis achieved with the Angio­Seal device (Terumo Corporation, Japan) provide an opportunity to reduce the number of fatal and non­fatal complications. Aim. A multicentre assay of the efficacy and safety of instrumental puncture closure using Angio­Seal devices (Terumo Corporation, Japan) in various settings and clinical situations.Materials and methods. A multicentre retrospective analysis of 1088 use cases of the Angio­Seal device  (Terumo Corporation, Japan) for “primary” and “complicated” instrumental haemostasis after femoral access  has been conducted for the years 2018–2020. The mean patient age was 62.3 ± 11.6 years, including 845 men (78.0%) and 243 women (22.0%). Five centres for routine and emergency endovascular radiology participated in the study.Results. The Angio­Seal device (Terumo Corporation, Japan) demonstrated a high method efficiency, with a  97.0% success rate of “primary” instrumental haemostasis (1055 of 1088 total successful haemostatic  procedures) in various clinical settings. Arterial thrombosis at the approach side had a 3.0% complication rate  (5 of 33 observations), all other complication types associated with haemorrhagic events (8 cases) or device malfunction and damage (20 cases).Discussion. The assay conducted suggests that the incidence of “complicated” instrumental haemostasis  relates to technical drawbacks of the device application that required advance planning. The key identified  prerequisites for a successful Angio­Seal application (Terumo Corporation, Japan) are the alignment of anchor tube­delivery through soft tissue into the vessel lumen and its positioning inside the vessel.Conclusion. The constructive features and instrumental haemostatic technique realised in the Angio­Seal  device (Terumo Corporation, Japan) enable an effective and safe primary sealing of arterial puncture site in 97% cases

Визначення залежності характеристик компресійної піни

One of the promising ways to combat forest fires is considered. The authors suggest using compression foam as an extinguishing agent instead of ordinary water, which has several advantages. Unlike conventional foam, it has special properties that are not characteristic of the ordinary foam, such as increased stability, enhanced adhesion and fire extinguishing ability while reducing the flow of water and foaming agent. In order to increase the effective use of this extinguishing medium, we performed the theoretical substantiation of the dependence of operational characteristics of the compression foam depending on the geometric dimensions and homogeneity of the bubbles it is made up if. The notion of conditional relative strength of the bubble as a value of the ratio of the area of ​​the central transverse section of the bubble to its bubble mass is introduced and the formulas for its deduction are given. The experimental dependences of the operational characteristics of the compression foam on the geometrical sizes and the homogeneity of the bubbles forming it, which will allow creating effective systems for the formation of a compressive foam, and controlling the processes of foaming and fire extinguishing, are presented. The results of the studies confirm that the values ​​of the diameters of the bubbles of the compression foam and their homogeneity, characterized by the polydispersity of the foam, determine its multiplicity, which in turn determines the stability and adhesion properties of the foam. With an increase in the frequency of foam, the polydispersity decreases, i.e., homogeneity increases. It has been proved that there is a direct relationship between the operational characteristics of the compression foam such as the foam stability, the adhesive property of the foam, the fire-extinguishing ability of the foam and its geometric characteristics – the size of the bubbles and their homogeneity, in which the size of the bubbles and their homogeneity (polydispersity) are the determining parameters of compression foam for its performance. Technological solutions aimed at reducing the size of foam bubbles and enhancing their uniformity will lead to improved performance of the compression foam in order to increase the fire-extinguishing capabilities of the compression foam in the fight against forest fires.Проведено теоретичне обґрунтування залежності експлуатаційних характеристик компресійної піни залежно від геометричних розмірів та однорідності бульбашок, що її утворюють. Введено поняття умовної відносної міцності бульбашки як величину відношення площі центрального поперечного перетину бульбашки до її маси бульбашки та наведено формули для його вирахування. Наведено експериментальні залежності експлуатаційних характеристик компресійної піни від геометричних розмірів та гомогенності міхурів, що її утворюють, що дає змогу створювати ефективні системи з утворення КП та здійснювати управління процесами піноутворення та пожежогасіння. Результати досліджень підтверджують, що величини діаметрів міхурів КП та їхня гомогенність, що характеризується полідисперсністю піни, визначають її кратність, яка визначає стійкість та адгезійні властивості піни. У разі збільшення кратності піни, полідисперсність зменшується, тобто гомогенність зростає. Доведено, що існує прямий зв'язок між експлуатаційними характеристиками компресійної піни, такими як: стійкість піни, адгезійна властивість піни, вогнегасна здатність піни та її геометричними характеристиками – розмірами бульбашок та їхня гомогенністю, при чому розміри міхурів та їх гомогенність (полідисперсність) є визначальними параметрами компресійної піни щодо її експлуатаційних характеристик. Технологічні рішення, спрямовані на зменшення розміру бульбашок піни та підвищення її однорідності призведуть до покращення експлуатаційних характеристик компресійної піни та її подальшого впровадження для підвищення ефективності гасіння лісних пожеж

Room Temperature High-Field Spin Dynamics of NV Defects in Sintered Diamonds

Sintered oriented nanodiamond arrays with the extremely high concentrations of the nitrogen-vacancy (NV) centers (up to 103 ppm) were investigated by the W-band (94 GHz) electron spin echo electron paramagnetic resonance techniques. The NV centers were fabricated by the high-pressure high-temperature sintering of detonation nanodiamonds (DND) without the post or prior irradiation of the samples. The processes of polarization and recovery of the equilibrium population of the spin sublevels by optical and microwave pulses have been examined at room temperature in high magnetic fields corresponding to the fine-structure transitions for the NV defects at 94 GHz (3,250-3,450 mT). A long spin coherence time of 1.6 μs and spin-lattice relaxation time of 1.7 ms were measured. The results were compared with those obtained on the NV centers fabricated by the irradiation and subsequent annealing of the commercially available bulk diamonds. It was shown that the relaxation characteristics of the NV defects were similar in the both types of the samples despite the extremely high concentrations of NV defects and isolated nitrogen donors in the sintered DND. © 2013 Springer-Verlag Wien