132 research outputs found
Slow-roll inflation in (R+R*4) gravity
We reconsider the toy-model of topological inflation, based on the
R*4-modified gravity. By using its equivalence to the certain scalar-tensor
gravity model in four space-time dimensions, we compute the inflaton scalar
potential and investigate a possibility of inflation. We confirm the existence
of the slow-roll inflation with an exit. However, the model suffers from the
eta-problem that gives rise to the unacceptable value of the spectral index n_s
of scalar perturbations.Comment: 12 pages, 3 figures, LaTeX, misprints corrected and references
update
Electromagnetic torque of valve engine with nonmagnetic anchor
ΠΠΎΠ»ΡΡΠ΅Π½Ρ ΡΠ°ΡΡΠ΅ΡΠ½ΡΠ΅ ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΠΌΠΎΠΌΠ΅Π½ΡΠ° ΡΠ΅ΠΊΡΠΈΠΈ Π²Π΅Π½ΡΠΈΠ»ΡΠ½ΠΎΠ³ΠΎ Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Ρ Ρ Π½Π΅ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΠΌ ΡΠΊΠΎΡΠ΅ΠΌ Π½Π° ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»Π΅ ΠΊΠΎΠΌΠΌΡΡΠ°ΡΠΈΠΈ ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΎ Π΅Π΅ ΠΎΠ±ΡΠ΅Π΅ Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ ΠΏΡΠΈ 120-Π³ΡΠ°Π΄ΡΡΠ½ΠΎΠΌ Π·Π°ΠΊΠΎΠ½Π΅ ΠΊΠΎΠΌΠΌΡΡΠ°ΡΠΈΠΈ. ΠΡΠΎΠΈΠ·Π²Π΅Π΄Π΅Π½Π° ΠΎΡΠ΅Π½ΠΊΠ° ΠΏΡΠ»ΡΡΠ°ΡΠΈΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΌΠΎΠΌΠ΅Π½ΡΠ°, ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½Π½ΡΡ
Π΄ΠΈΡΠΊΡΠ΅ΡΠ½ΠΎΠΉ ΠΊΠΎΠΌΠΌΡΡΠ°ΡΠΈΠ΅ΠΉ ΡΠ΅ΠΊΡΠΈΠΉ ΡΠΊΠΎΡΠ½ΠΎΠΉ ΠΎΠ±ΠΌΠΎΡΠΊΠΈ.The ratios for the electromagnetic moment calculation on the switching period in the section of the BLDC with a non-magnetic armature are obtained and general expression of the electromagnetic force at 120-degree switching law is determined. The estimation of the electromagnetic force ripple caused by discrete switching in the armature winding sections is performed
Influence of nettle powder addition on bread quality indicators
This article reflects the results of a study on the effect of nettle leaf powder on the physicochemical and organoleptic characteristics of wheat bread. Nettle leaves is a good source of proteins, fibers, minerals and other bioactive compounds and it could be an ideal ingredient for improving the nutritional value of bread and bakery products. Nettle leaf powder was mixed with wheat flour in different ratios: 1 %, 3 % and 5 % to prepare bread samples. The results showed a significant increase in the protein, ash and fiber content of bread. The specific volume of the bread decreased as the level of nettle leaf powder increased due to a decrease in the gluten content of the mixture and due to the interaction between dietary fiber components, water and gluten. Substitutions of 1 %, 3 % and 5 % give parameter values at least the same as the control sample and give acceptable indicators of bread quality in terms of specific volume and organoleptic properties
A Novel Approach of Synchronization of Microgrid with a Power System of Limited Capacity
Currently, active networks called microgrids are formed on the basis of local power supply systems with a small share of distributed generation. Microgrids operating in an island mode, in some cases, have the ability to transfer electricity excess to an external network leading to a synchronization requirement; thus, the optimization task in terms of the systemβs synchronization must be considered. This paper proposes a method for obtaining synchronization between microgrids and power systems of limited capacity based on a passive synchronization algorithm, allowing us to connect a microgrid to an external power system with a minimum impact moment on the shaft of the generating equipment. The algorithm application was demonstrated by considering a real-life object in Tajikistan. The simulation was carried out on RastrWin3. The obtained results show that the microgrid generator is connected to an external power system at an angle of 0.3β¦ and a power surge of 29 kW, unlike the classical synchronization algorithm with an angle of 6.8β¦ and a power surge of 154 kW (a reduction of the shock moment by more than five times). The proposed synchronization method allows us to reduce the resource consumption of the generating equipment and increase the reliability and efficiency of the functioning units of the examined power system. Β© 2021 by the authors. Licensee MDPI, Basel, Switzerland
Recommended from our members
Chromosome Translocations as a Driver of Diversification in Mole Voles Ellobius (Rodentia, Mammalia).
The involvement of chromosome changes in the initial steps of speciation is controversial. Here we examine diversification trends within the mole voles Ellobius, a group of subterranean rodents. The first description of their chromosome variability was published almost 40 years ago. Studying the G-band structure of chromosomes in numerous individuals revealed subsequent homologous, step-by-step, Robertsonian translocations, which changed diploid numbers from 54 to 30. Here we used a molecular cytogenetic strategy which demonstrates that chromosomal translocations are not always homologous; consequently, karyotypes with the same diploid number can carry different combinations of metacentrics. We further showed that at least three chromosomal forms with 2n = 34 and distinct metacentrics inhabit the Pamir-Alay mountains. Each of these forms independently hybridized with E. tancrei, 2n = 54, forming separate hybrid zones. The chromosomal variations correlate slightly with geographic barriers. Additionally, we confirmed that the emergence of partial or monobrachial homology appeared to be a strong barrier for hybridization in nature, in contradistinction to experiments which we reported earlier. We discuss the possibility of whole arm reciprocal translocations for mole voles. Our findings suggest that chromosomal translocations lead to diversification and speciation
Association of angiotensinogen and angiotensin II receptor type I polymorphisms with biomarkers of carbohydrate and lipid metabolism in Dagestan residents with type 2 diabetes and hypertension
Aim. To study the associations of angiotensinogen (AGT) (s4762(Π‘521Π’), rs699(Π’704C)) and angiotensin II receptor type I (AGTR1) (rs5186(A1166C)) genetic polymorphisms with serum levels of insulin, glucagon, C-peptide, leptin, as well as with dyslipidemia and glycemic levels in Dagestan residents with combination of type 2 diabetes (T2D) and hypertension (HTN), as well as with isolated T2D/HTN.Material and methods. We examined 16 patients with isolated T2D, 59 patients with T2D+HTN and 51 patients with isolated HTN from Dagestan. Genetic polymorphisms of the AGT and AGTR1 genes were studied. The levels of insulin, glucagon, C-peptide, and leptin were studied by enzyme-linked immunosorbent assay (ELISA), while lipid and carbohydrate metabolism β by biochemical methods.Results. In patients with T2D, the association of CC genotype of AGT gene rs4762(Π‘521Π’) polymorphism with a leptin decrease was determined, while its CT genotype was associated with an increase in serum level of triglycerides. The TC genotype of AGT gene rs699(Π’704C) polymorphism was associated with an increase in leptin, triglyceride and glucose levels. The AA genotype of AGTR1 gene rs5186(A1166C) polymorphism was associated with an increase in insulin and glucose levels, as well as a decrease in leptin level. In patients with a combination of T2D and HTN, CC and CT genotypes of AGT gene rs4762(Π‘521Π’) polymorphism was associated with a decrease in glucagon level. The TT genotype of AGT gene rs699(Π’704C) polymorphism was associated with an increase in insulin, triglyceride, glucose and body mass index (BMI) levels. In isolated HTN, the CC and CT genotypes of AGT gene rs4762(Π‘521Π’) polymorphism were associated ith a decrease in glucagon level. The TT genotype of AGT gene rs699(Π’704C) polymorphism was associated with increased levels of insulin, low density lipoproteins, and BMI.Conclusion. Associations of AGT (s4762(Π‘521Π’), rs699(Π’704C)) and AGTR1 (rs5186(A1166C)) genetic polymorphisms with carbohydrate and lipid metabolism changes are an important pathogenetic link of T2D and HTN, which allows developing an individual prognosis of these diseases in Dagestan residents
FLUX LINKAGE CALCULATION OF THE TEETH TIPS AND TEETH CORES IN THE INDUCTION MOTOR WITH RING WINDINGS WITH CERAMIC INSULATION
The paper presents the flux linkage calculation in the induction motor with ring windings (IMRW), which is intended for processing nuclear waste under conditions of increased radiation and temperature. The article describes the procedure for determining the fluxes distribution in the magnetic circuit of the engine. The βANSYS Maxwellβ program was used as a tool when performing calculations.Π ΡΠ°Π±ΠΎΡΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ ΡΠ°ΡΡΠ΅Ρ ΠΏΠΎΡΠΎΠΊΠΎΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΠΉ Π² Π°ΡΠΈΠ½Ρ
ΡΠΎΠ½Π½ΠΎΠΌ Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Π΅ Ρ ΠΊΠΎΠ»ΡΡΠ΅Π²ΡΠΌΠΈ ΠΎΠ±ΠΌΠΎΡΠΊΠ°ΠΌΠΈ (ΠΠΠΠ), ΠΊΠΎΡΠΎΡΡΠΉ ΠΏΡΠ΅Π΄Π½Π°Π·Π½Π°ΡΠ΅Π½ Π΄Π»Ρ ΠΏΠ΅ΡΠ΅ΡΠ°Π±ΠΎΡΠΊΠΈ ΡΠ΄Π΅ΡΠ½ΡΡ
ΠΎΡΡ
ΠΎΠ΄ΠΎΠ² Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΠΏΠΎΠ²ΡΡΠ΅Π½Π½ΠΎΠΉ ΡΠ°Π΄ΠΈΠ°ΡΠΈΠΈ ΠΈ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ. Π ΡΡΠ°ΡΡΠ΅ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡΡΡ ΠΏΠΎΡΡΠ΄ΠΎΠΊ Π΄Π΅ΠΉΡΡΠ²ΠΈΠΉ ΠΏΠΎ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΏΠΎΡΠΎΠΊΠΎΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π² ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΡΠ΅ΠΏΠΈ Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Ρ. Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΈΠ½ΡΡΡΡΠΌΠ΅Π½ΡΠ° ΠΏΡΠΈ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠΈ ΡΠ°ΡΡΠ΅ΡΠΎΠ² ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»ΡΡ ΠΏΡΠΈΠΊΠ»Π°Π΄Π½ΠΎΠΉ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΡΠΉ ΠΏΠ°ΠΊΠ΅Ρ βANSYS Maxwellβ
f(R) theories
Over the past decade, f(R) theories have been extensively studied as one of
the simplest modifications to General Relativity. In this article we review
various applications of f(R) theories to cosmology and gravity - such as
inflation, dark energy, local gravity constraints, cosmological perturbations,
and spherically symmetric solutions in weak and strong gravitational
backgrounds. We present a number of ways to distinguish those theories from
General Relativity observationally and experimentally. We also discuss the
extension to other modified gravity theories such as Brans-Dicke theory and
Gauss-Bonnet gravity, and address models that can satisfy both cosmological and
local gravity constraints.Comment: 156 pages, 14 figures, Invited review article in Living Reviews in
Relativity, Published version, Comments are welcom
Antibiotic therapy of chronic prostatitis in elderly and senile age
The etiological structure of chronic bacterial prostatitis in 110 of patients of elderly and senile age was studied. It was noted, that the agents of this nosology were in most of the cases - conditional-pathogenic pathogens of the family Enterobacteriaceae. Considering the clinical and microbiological efficacy, safety and tolerability of the antibiotic, the drug of choice of antibacterial therapy is a new generation fluoroquinolone - levofloxacin, which meets the requirements of the WHO.ΠΠ·ΡΡΠ΅Π½Π° ΡΡΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠ°Ρ ΡΡΡΡΠΊΡΡΡΠ° Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
Π±Π°ΠΊΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΡ
ΠΏΡΠΎΡΡΠ°ΡΠΈΡΠΎΠ² Ρ 110 ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΠΏΠΎΠΆΠΈΠΏΠΎΠ³ΠΎ ΠΈ ΡΡΠ°ΡΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²ΠΎΠ·ΡΠ°ΡΡΠ°. Π£ΡΡΠ°Π½ΠΎΠ²ΠΏΠ΅Π½ΠΎ, ΡΡΠΎ Π² Π±ΠΎΠ»ΡΡΠΈΠ½ΡΡΠ²Π΅ ΡΠ»ΡΡΠ°Π΅Π² Π²ΠΎΠ·Π±ΡΠ΄ΠΈΡΠ΅Π»ΡΠΌΠΈ Π΄Π°Π½Π½ΠΎΠΉ Π½ΠΎΠ·ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ²Π»ΡΡΡΡΡ ΡΡΠ»ΠΎΠ²Π½ΠΎ-ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΡΠ΅ ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΡ ΡΠ΅ΠΌΠ΅ΠΉΡΡΠ²Π° ΡΠ½ΡΠ΅ΡΠΎΠ±Π°ΠΊΡΠ΅ΡΠΈΠΉ. Π£ΡΠΈΡΡΠ²Π°Ρ ΠΊΠ»ΠΈΠ½ΠΈΠΊΠΎ-ΠΌΠΈΠΊΡΠΎΠ±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ, Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΡ ΠΈ ΠΏΠ΅ΡΠ΅Π½ΠΎΡΠΈΠΌΠΎΡΡΡ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠ° ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠΎΠΌ Π²ΡΠ±ΠΎΡΠ° Π°Π½ΡΠΈΠ±Π°ΠΊΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΡΠΎΡΡ
ΠΈΠ½ΠΎΠ»ΠΎΠ½ Π½ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΠΎΠΊΠΎΠ»Π΅Π½ΠΈΡ Π»Π΅Π²ΠΎΡΠ»ΠΎΠΊΡΠ°ΡΠΈΠ½, ΠΎΡΠ²Π΅ΡΠ°ΡΡΠΈΠΉ ΡΡΠ΅Π±ΠΎΠ²Π°Π½ΠΈΡΠΌ ΠΠΠ
On the issue of carriage and antibiotic resistance of staphylococci isolated from the clinical material of patients of the miscarriage department of the maternity hospital β 2 of the Ministry of Health of the Republic of Dagestan
The frequency of isolating staphylococci and the dynamics of the development of their resistance to antibiotics, isolated from patients of the miscarriage ward of the maternity hospital No. 2 of the Ministry of Health of the Republic of Dagestan for a 5-year period (2013-2017) are analyzed. 398 staphylococcal strains were studied: 203 Staphylococcus aureus and 195 β Staphylococcus epidermidis. It has been established that in the last 2-3 years there has been an increase in the carrier of gram-positive bacteria. There was a marked increase in the outgrowth of S. aureus (almost 2.0 times), and the ratio between S. aureus and S. epidermidis in 2017 increased 1.3 times. The study of the sensitivity of the isolated strains of staphylococci to microbial preparations showed that the overwhelming majority of them are multi-resistant to antibiotics. Determination of sensitivity to antibacterial drugs revealed that most of the isolated strains are sensitive to fluoroquinolone, a new generation of levofloxacin (tavanic).ΠΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π° ΡΠ°ΡΡΠΎΡΠ° Π²ΡΠ΄Π΅Π»Π΅Π½ΠΈΡ ΡΡΠ°ΡΠΈΠ»ΠΎΠΊΠΎΠΊΠΊΠΎΠ² ΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠ° ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΈΡ
ΡΠ΅Π·ΠΈΡΡΠ΅Π½ΡΠ½ΠΎΡΡΠΈ ΠΊ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠ°ΠΌ, Π²ΡΠ΄Π΅Π»Π΅Π½Π½ΡΡ
Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠΊ ΠΎΡΠ΄Π΅Π»Π΅Π½ΠΈΡ Π½Π΅Π²ΡΠ½Π°ΡΠΈΠ²Π°Π½ΠΈΡ Π±Π΅ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΡΡΠΈ ΡΠΎΠ΄ΠΈΠ»ΡΠ½ΠΎΠ³ΠΎ Π΄ΠΎΠΌΠ° β 2 Π3 Π Π Π·Π° 5-Π»Π΅ΡΠ½ΠΈΠΉ ΠΏΠ΅ΡΠΈΠΎΠ΄ (2013-2017Π³.Π³.). ΠΡΠ»ΠΈ ΠΈΠ·ΡΡΠ΅Π½Ρ 398 ΡΡΠ°ΠΌΠΌΠΎΠ² ΡΡΠ°ΡΠΈΠ»ΠΎΠΊΠΎΠΊΠΊΠΎΠ²: 203 Staphylococcus aureus ΠΈ 195 - Staphylococcus epidermidis. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π² ΠΏΠΎΡΠ»Π΅Π΄Π½ΠΈΠ΅ 2-3 Π³ΠΎΠ΄Π° ΠΎΡΠΌΠ΅ΡΠ°Π΅ΡΡΡ ΡΠΎΡΡ Π½ΠΎΡΠΈΡΠ΅Π»ΡΡΡΠ²Π° Π³ΡΠ°ΠΌΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΡ
Π±Π°ΠΊΡΠ΅ΡΠΈΠΉ. ΠΡΠΌΠ΅ΡΠ΅Π½ Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΡΠΉ ΡΠΎΡΡ Π²ΡΡΠ΅Π²Π°Π΅ΠΌΠΎΡΡΠΈ S. aureus (ΠΏΠΎΡΡΠΈ Π² 2,0 ΡΠ°Π·Π°), Π° ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ ΠΌΠ΅ΠΆΠ΄Ρ S. aureus ΠΈ S. epidermidis Π² 2017 Π³. Π²ΡΡΠΎΡΠ»ΠΎ Π² 1,3 ΡΠ°Π·Π°. ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ Π²ΡΠ΄Π΅Π»Π΅Π½Π½ΡΡ
ΡΡΠ°ΠΌΠΌΠΎΠ² ΡΡΠ°ΡΠΈΠ»ΠΎΠΊΠΎΠΊΠΊΠΎΠ² ΠΊ ΠΌΠΈΠΊΡΠΎΠ±Π½ΡΠΌ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠ°ΠΌ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΎ, ΡΡΠΎ ΠΏΡΠ΅ΠΎΠ±Π»Π°Π΄Π°ΡΡΠ΅Π΅ Π±ΠΎΠ»ΡΡΠΈΠ½ΡΡΠ²ΠΎ ΠΈΠ· Π½ΠΈΡ
ΠΏΠΎΠ»ΠΈΡΠ΅Π·ΠΈΡΡΠ΅Π½ΡΠ½Ρ ΠΊ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠ°ΠΌ. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΊ Π°Π½ΡΠΈΠ±Π°ΠΊΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΠΌ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠ°ΠΌ Π²ΡΡΠ²ΠΈΠ»ΠΎ, ΡΡΠΎ Π±ΠΎΠ»ΡΡΠΈΠ½ΡΡΠ²ΠΎ Π²ΡΠ΄Π΅Π»Π΅Π½Π½ΡΡ
ΡΡΠ°ΠΌΠΌΠΎΠ² ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½Ρ ΠΊ ΡΡΠΎΡΡ
ΠΈΠ½ΠΎΠ»ΠΎΠ½Ρ Π½ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΠΎΠΊΠΎΠ»Π΅Π½ΠΈΡ Π»Π΅Π²ΠΎΡΠ»ΠΎΠΊΡΠ°ΡΠΈΠ½ (ΡΠ°Π²Π°Π½ΠΈΠΊ)
- β¦