Cross Type Research Articles

Serum magnesium and zinc levels- A predictor of cardiovascular risk in hemodialysis patients

Cardiovascular disease is one of the leading causes of mortality in haemodialysis patients. Several studies have demonstrated the relation of zinc and magnesium in cardiovascular disease. In present study we aimed to measure serum zinc and magnesium levels and correlate with the Framingham score to calculate the cardiovascular risk.Present study was prospective, cross sectional type, conducted in chronic kidney disease patients undergoing haemodialysis.Serum magnesium, zinc, cholesterol, urea, creatinine, HDL cholesterol, systolic BP are measured and Framingham score was calculated. And zinc and magnesium values were correlated with Framingham score. The study is conducted in 100 CKD patients undergoing hemodialysis. Out of 100 CKD patients undergoing hemodialysis, 59% had high risk,28% had intermediate risk, and 13% had low risk of developing cardiovascular disease according to their Framingham risk score. In these patients, zinc and magnesium levels were found and correlated with Framingham risk score. Out of 100 patients undergoing hemodialysis, 37 patients were hypomagnesemic, 43 patients were normomagnesemic, 20 patients were hypermagnesemic. In this, a positive correlation was found between development of hypomagnesemia and duration of hemodialysis. Magnesium level was correlated with Framingham risk score. In this hypomagnesemic patients, 67% patients have low risk, 8% have intermediate risk, 24% patients have high risk of developing heart disease. Out of 100 patients, 86 patients have normal zinc level, 14 patients have increased zinc level. Zinc levels was not altered during dialysis. These patients already have risk of developing heart disease independent of zinc level.In our study, magnesium level of haemodialysis patients was reduced and it is associated with duration of haemodialysis. Zinc levels were not altered in the patients.

State and prospects of development of tomato breeding in modern market conditions

Relevance. To meet the needs of the population and commodity producers in the south of Russia in tomatoes, it is necessary to develop varieties and hybrids of various directions that have high productivity, increased fruit quality and resistance to fungal and bacterial diseases, that meet modern production technologies and market requirements, as well as have an acceptable price for seeds.Aim of study – creation of new maternal tomato lines with functional male sterility for open ground for various purposes (for fresh consumption, whole-fruit canning,), which will make it possible to create highly productive hybrids that meet the agro-climatic conditions of the south of Russia in the future.Materials and methods. The studies were carried out in a breeding film greenhouse and in field conditions on the territory of the experimental plot of FSBSI "Federal Scientific Rice Centre" of the central soil-climatic zone of Krasnodar region. The object of research were mid-ripening tomato varieties included in the competitive testing, sterile tomato lines, new F1 hybrids based on FMS, collection and breeding material. The types of crosses used in the work: analyzing, saturating, top-crosses. To speed up the process of developing new sterile tomato lines in winter, artificial climate chambers were used.Results. As a result of the research, promising new functionally sterile lines of tomato were identified, differing in the length of the vegetation period, weight, color, fruit shape, biochemical parameters, with a number of useful economically valuable traits.

STUDY OF CEPHALIC INDEX IN NEWBORNS OF KAVRE REGION

Background: The cephalometry of newborn within first few days is important for assessment of health status, neonatal death, growth and development. The objective of the study is to provide a baseline data for cephalic index and to observe sexual dimorphism. Methods: The present study was cross sectional type. It consisted of 138(72 males, 66 females) healthy neonates born in Dhulikhel hospital via vaginal delivery. It was conducted from June 2019 to March 2020 after receiving ethical approval. The cephalic index was derived after measuring length and breadth of head. The collected data was entered in excel and analyzed with SPSS (16.0). Results: The conducted study revealed the overall cephalic index as 86.51±4.95 and head circumference to be 336.05±13.87 mm. The values of head circumference and head length of males were higher than that of females. The head breadth of males was found to be significantly higher than that of females. The most common type of head type was hyperbrachycephalic with prevalence of 37.7% (40.3% males and 34.8% females). Conclusions: This study concluded that the majority type of head was hyperbrachycephalic.

Symmetry-protected topological phases and competing orders in a spin- 12 XXZ ladder with a four-spin interaction

We study a spin-$\frac{1}{2}$ XXZ model with a four-spin interaction on a two-leg ladder. By means of effective field theory and matrix product state calculations, we obtain rich ground-state phase diagrams that consist of eight distinct gapped phases. Four of them exhibit spontaneous symmetry breaking with either a magnetic or valence-bond-solid (VBS) long-range order. The other four are featureless, i.e., the bulk ground state is unique and does not break any symmetry. The featureless phases include the rung singlet (RS) and Haldane phases as well as their variants, the RS* and Haldane* phases, in which twisted singlet pairs $(|\ensuremath{\uparrow}\ensuremath{\downarrow}\ensuremath{\rangle}+|\ensuremath{\downarrow}\ensuremath{\uparrow}\ensuremath{\rangle})/\sqrt{2}$ are formed between the two legs. We argue and demonstrate that Gaussian transitions with the central charge $c=1$ occur between the featureless phases and between the ordered phases while Ising transitions with $c=1/2$ occur between the featureless and ordered phases. The two types of transition lines cross at the $\mathrm{SU}(2)$-symmetric point, where the criticality is described by the $\mathrm{SU}{(2)}_{2}$ Wess-Zumino-Witten theory with $c=3/2$. The RS-Haldane* and RS*-Haldane transitions give examples of topological phase transitions. Interestingly, the RS* and Haldane* phases, which have highly anisotropic nature, appear even in the vicinity of the isotropic case. We demonstrate that all the four featureless phases are distinguished by topological indices in the presence of certain symmetries.

Safe pedestrian crossings as a tool to raise the quality of life for urban areas (A case study on Al-Haram st.). (Dept. A)

Pedestrians are the basic nucleus that uses the road, but interest in them did not emerge as a major indicator in the planning and design processes, and the study gave high focus on pedestrian behavior and how they deal with their crossings as the most important equipment that provides a safe and comfortable environment for pedestrian traffic, and the efficiency of the crossings And its importance in preventing pedestrian traffic from interfering with vehicle traffic and the extent of its respect for the behavioral aspect of the planning process. Al-Haram Street suffers from traffic problems with regard to pedestrian crossings, so cases have been studied inside Al-Haram Street that express the different types of crossings, and observation and monitoring has been relied on through field visits, photography and aerial maps. The results indicated that one of the most important reasons for non-compliance with some Pedestrians in the roads of their own lanes is the lack of infrastructure necessary to provide safe points for dispersed crossing, lack of traffic culture, failure of the designer to take into account the behavioral aspect of pedestrians, in addition to the absence of deterrent laws for violators.

Study of impurities in newly manufacturing 1215MS+Bi steels by altering cooling processes

ABSTRACT To accurately study the distribution characteristics of impurities and microstructures in the 2800 ppm Bi content 1215 MS steel, the horizontal solidification experiments were carried out by altering horizontal cooling processes. Results show that under moving rates (υ) = 0.3 mm/s and 0.5 mm/s the equivalent diameters of the impurities in steels at the interface between the chilled grain zone and columnar grain zone were higher at 1.6 ~ 1.8 μm, 2 ~ 3 times larger than those in the chilled boundary. Most small-sized inclusions were gathered in circular or linear distribution with the sizes of <1.0 μm. The morphologies of MnS/Bi-MnS inclusions were in rod-like, long strip, spindle, ellipsoidal, and spherical shape. The high υ value was beneficial for increasing the equivalent diameters of the impurities in the chilled grain zone and resulted in the reduction in the inclusions sizes in the columnar grain zone but it seldomly affected their sizes in the equiaxed grain zone. The morphologies of the equiaxed grains were in directional stacking, cross, anisotropy and coniferous pine types.

Evaluation of Safety Performance of Level Crossings in Turkey with Data Envelopment Analysis

Level crossing, also known as railroad and highway crossings, pose a risk to those who use both modes of transport due to collisions that may occur. This risk associated with level crossings is of great importance both in Turkey and in the world. In this study, data envelopment analysis was performed on the accident data occurring on five types of level crossings in Turkey and a measurement of safety performances of level crossings in Turkey was provided. As a result of the analysis, the most efficient three-level crossings were found to be Hilal-Bandırma in Manisa, Samsun-Kalın in Amasya_1, and Samsun-Kalın in Amasya_2. In addition, a linear regression model that serves with the variables which are the components of level crossing and the number of accidents is established. In this model, it is seen that the ratio of independent variables to dependent variables was statistically significant.

Ectomycorrhizal fungal communities differ among parental and hybrid Populus cross types within a natural riparian habitat

Plant hybridization is common and important in ecological and economic contexts, however little is known about the impact of plant hybridization on ectomycorrhizal fungal (EMF) communities in natural habitats. We used a Populus hybrid system ( P. angustifolia x P. fremontii ) in a heterogeneous riparian landscape to address the hypothesis that EMF communities differ among hybrids and their parental species (cross types). Several key results emerged. (1) Cross type influenced EMF composition, with communities on hybrids being distinct from their parents. (2) Cross type influenced the composition of hyphal exploration types important for soil resource foraging, although contact and short distance exploration types were dominant on all cross types. (3) Cross type had a marginal influence on EMF colonization, with P. angustifolia highest and P. fremontii lowest. These results highlight the potential for tree hybridization to structure belowground communities in heterogeneous natural ecosystems.

Technical Study of Ethiopian Copper Alloy Processional Crosses Using Non-Destructive Analysis

ABSTRACT The materials and techniques used to make Ethiopian copper and copper alloy processional crosses from the twelfth to twentieth centuries were investigated through technical study including X-ray fluorescence analysis (XRF). All 20 crosses in this multi-collection study underwent XRF analysis while the eight crosses from the collection of the Virginia Museum of Fine Arts additionally underwent X-radiography and scanning micro-XRF. The documentation of fabrication methods and repairs was carried out using non-destructive methods, including the application of scanning micro-XRF, which in this study, proved to be especially valuable for identifying and mapping solder and cast-on repairs. Additionally, results from XRF analysis confirmed patterns in alloy type related to cross style and chronology. Specifically, bronze was identified as the alloy used to make the earliest (twelfth – fourteenth century) crosses, while the later crosses (post fifteenth century) were found to be made of brass and gunmetal. Crosses dating to what appears to be a transitional period during the fourteenth – fifteenth century were found to be made of a greater variety of materials including copper, bronze, and brass. While the difference in alloy types found in crosses from different time periods may be related to changing preferences or access to certain metals, the mass removal of religious art in the sixteenth century could have also impacted the types of crosses that remain.

Determining the Sterilization Doses under Hypoxia for the Novel Black Pupae Genetic Sexing Strain of Anastrepha fraterculus (Diptera, Tephritidae).

Simple SummaryThe sterile insect technique is an environmentally-friendly method that can be used to manage populations of the South American fruit fly Anastrepha fraterculus, but its sterilizing doses have been determined only under normoxia. To maintain sterile male fly quality without jeopardizing sterility, a strategy of applying the radiation dose under an oxygen-reduced atmosphere is commonly used. Therefore, this study tested a range of gamma radiation doses under hypoxia on pupae from a bisexual strain and a novel genetic sexing strain (GSS) of A. fraterculus. Four types of crosses between irradiated flies under hypoxia and nonirradiated flies of the bisexual strain were set to assess sterility for each strain and radiation dose. For males from both strains, the effect of radiation dose on the percentage of egg hatch, egg-to-pupa recovery, and recovery of adults were determined. A dose of 74 Gy reduced egg hatch by 99% regardless of the male strain and was considered the sterilizing dose. The fertility of irradiated females and development of their offspring were severely affected, even at low doses under hypoxia, and no eggs were laid with doses above 50 Gy.A common strategy used to maintain sterile fly quality without sacrificing sterility is to irradiate the insects under an oxygen-reduced atmosphere. So far, sterilizing doses for the South American fruit fly Anastrepha fraterculus have only been determined under normoxia. Our study reports for the first time the dose-sterility response under hypoxia for two different A. fraterculus strains. The pupae were derived from a bisexual strain (a Brazilian-1 population) and a recently developed genetic sexing strain (GSS-89). Two hours prior to irradiation, pupae were transferred to sealed glass bottles and irradiated when oxygen concentration was below 3%. Four types of crosses with nonirradiated flies of the bisexual strain were set to assess sterility for each radiation dose. For males from both strains, Weibull dose–response curves between radiation doses and the proportion of egg hatch, egg-to-pupa recovery, and recovery of adults were determined. The GSS males revealed high sterility/mortality levels compared to males from the bisexual strain at doses < 40 Gy, but a dose of 74 Gy reduced egg hatch by 99% regardless of the male strain and was considered the sterilizing dose. The fertility of irradiated females was severely affected even at low doses under hypoxia.

Dynamic changes in the genetic parameters of growth traits with age and their associations with heterosis in hybrid Liriodendron

Liriodendron plants have been cultivated in many regions of the world for both wood production and landscape ornamentation. Hybrid Liriodendron varieties show obvious growth and resistance heterosis; thus, interspecies hybridization and heterosis utilization constitute the major breeding strategy for Liriodendron plants. Choosing superior crossing parents/combinations and predicting the heterosis of potential hybrid combinations will greatly improve breeding efficiency and accelerate the breeding process. To explore the relationships between genetic parameters and heterosis, we investigated dynamic changes in the genetic parameters of growth traits with age by testing 57 progeny combinations derived from six cross types in Liriodendron. Tree height (H) and diameter at breast height (DBH) were under intermediate to strong genetic control and varied among combinations, indicating that parent-pair selection or combination selection is feasible. Both heritability and combining ability (general combining ability, GCA; specific combining ability, SCA) changed with age, with narrow-sense heritability fluctuating greatly in the early stage and increasing in the late stage, and the combining abilities varied among combinations. Additionally, the GCA of Liriodendron chinense parents was higher than that of Liriodendron tulipifera and hybrid Liriodendron parents, and the SCA of L. tulipifera × L. chinense combinations fluctuated less than that of other combinations. Further, midparent heterosis (MPH) and SCA were significantly positively correlated, suggesting that SCA could be a suitable criterion for predicting growth heterosis. Our findings provide useful clues for selecting parent pairs/combinations and predicting heterosis, which will accelerate Liriodendron tree breeding and shed light on cross-breeding in other plants.

Promotion Energy Analysis Predicts Reaction Modes: Nucleophilic and Electrophilic Aromatic Substitution Reactions.

To develop an approach to pre-emptively predict the existence of major reaction modes associated with a chemical system, based on exclusive consideration of reactant properties, we build herein on the valence bond perspective of chemical reactivity. In this perspective, elementary chemical reactions are conceptualized as crossovers between individual diabatic/semilocalized states. As demonstrated, the spacings between the main diabatic states in the reactant geometries-the so-called promotion energies-contain predictive information about which types of crossings are likely to occur on a potential energy surface, facilitating the identification of potential transition states and products. As an added bonus, promotion energy analysis provides direct insight into the impact of environmental effects, e.g., the presence of (polar) solvents and/or (local) electric fields, on a mechanistic landscape. We illustrate the usefulness of our approach by focusing on model nucleophilic and electrophilic aromatic substitution reactions. Overall, we envision our analysis to be useful not only as a tool for conceptualizing individual mechanistic landscapes but also as a facilitator of systematic reaction-network exploration efforts. Because the emerging VB descriptors are computationally inexpensive (and can alternatively be inferred through machine learning), they could be evaluated on-the-fly as part of an exploration algorithm. The so-predicted reaction modes could subsequently be examined in detail through computationally more-demanding methods.

Interspecific crosses involving Rf3 gene carriers as potential sources of R lines for D2 type cytoplasm based hybrid wheat system

The exploitation of heterosis, which is associated with the development of hybrid wheat varieties, has a great potential for increasing global wheat grain yields. Nevertheless, common wheat hybrids now account for less than 1% of global wheat production. In practice, two general approaches in hybrid wheat seeds production are being used. The first is based on the application of a chemical hybridizing agent, while the second is based on the use of cytoplasmic-genetic male sterility derived from Triticum timopheevii Zhuk. (G type cytoplasm). In this study, we present the development of R (restorer) lines for an alternative hybrid wheat system based on the cytoplasm of Aegilops crassa Boiss. (D2 type cytoplasm). Considering the cytoplasm types, it was found that different types of experimental F1 crosses required different sources of fertility restorer genes. CMS materials with T. timopheevii cytoplasm achieved the highest productivity in combination with Rf3 gene carriers. On the other hand, CMS materials with D2 cytoplasm in combination with interspecific crosses of synthetic hexaploid wheat accessions and SBEII mutants led to highly heterotic F1 hybrids. D2 cytoplasm based male sterility induction system represents a promising tool for hybrid wheat development.

Risk Factors and Clinical Profile of Respiratory Distress in Newborn: A Hospital Based Study in Bangladesh Army

Neonatal respiratory distress (NRD) is a main cause of neonatal morbidity and mortality in developing countries. Early detection of its risk factors and early treatment of its causes are major challenges. There are many causes of respiratory distress, among them, transient tachypnea of newborn (TTN), respiratory distress syndrome (RDS) and perinatal asphyxia are commonest causes. Timely and appropriate therapy is essential to prevent ongoing injury and improve outcome. The aim of this study was to determine the risk factors and to identify the causes of respiratory distress in neonatal intensive care unit (NICU) in Combined Military hospital (CMH) Sylhet and to observe the hospital outcome of these babies. Descriptive type of cross- sectional study was conducted in CMH Sylhet over a period of one year from April 2018 to March 2019. During the study period a total of 287 live newborns were found and included as study subjects to observe for development of respiratory distress. The overall prevalence of respiratory distress was 19.2%. There was male predominance (63.6%) and more than two third (71.1%) were born by cesarean section. Prematurity (38.2%), low birth weight (52.7%), male gender (63.6%), APGAR at 1 min &lt;7 (10.9%), caesarean delivery (76.4%), less antenatal care visit (52.7%), more than 4 pervaginal examinations 49.1%, acute fetal distress 43.6% and gestational diabetes mellitus 34.5% were the most common risk factors for development of NRD. The main causes were transient tachypnea of newborn 47.3%, respiratory distress syndrome 29.1% and perinatal asphyxia 10.9%. All babies required high flow oxygen initially, subsequently Bubble Continuous Positive Airway Pressure (CPAP) and mechanical ventilation was required in 14.5% and 1(1.8%) cases respectively. Mortality was 1.8% in neonates with respiratory distress syndrome with pneumothorax with septicaemia requiring mechanical ventilation. NRD is a frequent emergency and causes high morbidity and mortality. Risk factors like prematurity, low birth weight, male gender, APGAR at 1 min &lt;7, caesarean delivery, less antenatal care visit, more than 4 pervaginal examinations, acute fetal distress and gestational diabetes mellitus were associated with respiratory distress in newborns. Majority of cases are due to TTN followed by respiratory distress syndrome and perinatal asphyxia. Mortality was in RDS mainly related to pneumothorax with septicaemia. Better obstetrical care and timely intervention may improve the outcome of newborn respiratory distress.&#x0D; Bangladesh Med J. 2019 Sep; 48 (3): 21-27

Altered Voices and Gender-Bending: Prince, Camille, Opera, and Society

ABSTRACT During the 1980s Prince composed and produced songs under a variety of alter-egos. One alter-ego was a character he called Camille. As Camille, Prince sang in a voice altered by technology—it was high pitched and sounded feminine or androgynous. This article seeks to draw a connection between the androgyny in Prince’s appearance, music, and vocal performance in the 1980s, and in his Camille persona, and types of gender boundary crossings in three periods in the evolution of opera performance.

Multi–Grid Back–Projection Networks

Multi–grid back–projection (MGBP) is a fully–convolutional network architecture that can learn to restore images and videos with upscaling artifacts. Using the same strategy of multi–grid partial differential equation (PDE) solvers this multiscale architecture scales computational complexity efficiently with increasing output resolutions. The basic processing block is inspired in the iterative back–projection (IBP) algorithm and constitutes a type of cross–scale residual block with feedback from low resolution references. The architecture performs in par with state–of–the-arts alternatives for regression targets that aim to recover an exact copy of a high resolution image or video from which only a downscale image is known. A perceptual quality target aims to create more realistic outputs by introducing artificial changes that can be different from a high resolution original content as long as they are consistent with the low resolution input. For this target we propose a strategy using noise inputs in different resolution scales to control the amount of artificial details generated in the output. The noise input controls the amount of innovation that the network uses to create artificial realistic details. The effectiveness of this strategy is shown in benchmarks and it is explained as a particular strategy to traverse the perception–distortion plane.

Common-garden comparison of relative survival and fitness-related traits of wild, farm, and hybrid Atlantic salmon Salmo salar parr in nature

When escapee farmed Atlantic salmon Salmo salar interbreed with wild fish, the introgression of maladaptive genes can lower wild population productivity and alter key life history traits. To date, only a few European studies have compared wild, farm, and hybrid salmon under common conditions in the wild, isolating the influence of genetics on survival and fitness-related traits. Here, we examined the performance of experimentally derived Atlantic salmon fry from 4 cross types (wild, farm, and reciprocal F1 hybrids) during the first summer of growth at 3 locations in southern Newfoundland. Overall survival was high, with the cross type rank order consistent across sites (mean percent recaptured: wild-mother hybrids 26.2% ≈ wild 26.0% &gt; farm 19.2% &gt; farm-mother hybrids 12.8%). Wild fish were smaller than wild-mother hybrids and farm fish, though differed less in size from farm-mother hybrids. At 2 out of 3 sites, wild-mother hybrids were larger than wild and farm-mother hybrid fish but had only a small size advantage over farm fish. Shape differences were small and mainly related to body depth, with the largest differences between wild and farm fish. Wild-mother hybrids had fewer parr marks than other cross types at a single site, and though differences in the size of marks were minimal, farm fish tended to have the narrowest marks. Overall, these results show that genetic differences exist for fitness-related traits among wild, farm, and hybrid juveniles, even over short temporal scales and under favourable environmental conditions, and may contribute to patterns of reduced farm-mother hybrid and feral farm survival in the wild.

Cost factors and statistical evaluation of gas transmission pipeline construction and compressor-station cost in the USA, 2014-2019

The costs of constructing pipelines will vary widely from area to area depending on the length and diameter of the pipeline, population density, the terrain, number and type of crossings, right of way requirements, regulatory conditions, time of construction and the market conditions of equipment and materials. From 2014-2019, 2,063 miles of gas transmission pipeline and 1.9 million horsepower compression regulated by the Federal Energy Regulatory Commission were installed in the USA at a unit cost of $5.72 million per mile and $3,030 per horsepower. In this paper, pipeline construction cost factors are described and gas transmission construction and compressor-station cost statistics and regression models are evaluated. Aggregate metrics are the most stable and reliable statistic and probably the most representative, but for small samples significant restrictions apply. There are large cost deviations in pipeline construction compared to compressor-stations reflecting differences in material and service cost. Route length and line diameter are the only variables needed to develop robust linear models of pipeline construction cost. [Received: January 13, 2020; Accepted: January 13, 2020]

Estudio de la endogamia en tomate de cáscara (Physalis ixocarpa Brot. ex Horm.)

Only intervarietal and interfamilial hybridization can be carried out in tomatillo. Therefore, the objective was to study the effect of inbreeding in families of four varieties of tomatillo obtained through three generations of mating by fraternal and plant-to-plant crosses. The varieties studied were Tecozautla, Diamante, Manzano and Morado, each represented by three maternal half-sib families (Generation 1). In 2018, plant-to-plant and fraternal crosses were made in selected plants within each family, resulting in full-sib (FSF) and maternal half-sib (MHSF) families, respectively (Generation 2). In 2019, the process was repeated in Generation 2 families, and another generation of FSFs and MHSFs (Generation 3) was obtained. Field evaluation was conducted in 2020. A randomized complete block design with four replications was used, and yield per plant was evaluated in two harvests and total yield per plant, as well as fruit weight, volume and bulk density, in each harvest and average of harvests. Inbreeding depression occurred among generations. Fruit yield, size and volume in the first harvest decreased over generations. The Tecozautla and Diamante varieties showed greater inbreeding depression. The type of cross had a different effect depending on the variety. Fruit size was lower in plant-to-plant crosses in Tecozautla, Diamante and Morado; that is, they generated greater inbreeding depression than the fraternal crosses.

Solution to “the Kuznets Riddle”

S. Kuznets's study that average propensity to consume is a constant value were nexpected because they denied one of basic provisions of Keynesian theory. This fact was called the riddle of F. Modigliani and M. Friedman, using hypothesis of life cycle and concept of constant income, proposed two options that explain its solution. But models should not explain, but give a method of solution. The most controversial is indicator of autonomous consumption. In first model, it grows, and in second it goes to zero. Creation of a method of simulation of consumption functions based on common methodological principles for consideration of micro and macroeconomic systems. Having constructed a model that objectively describes activity of a separate enterprise, primary and primary links of macroeconomic system, we can explore whole system. At exit of economic system we consider two functions of offer - cost and cost-price, and one demand. These functions form two types of Keynesian cross, which define two points: break-even and economic power (equilibrium In a three-dimensional space a chain of transformations is considered: profit, investments, fixed assets, growth of depreciation (constant costs) and output. The condition for formation of a proportional development economy - average propensity to consume should remain unchanged, which is achieved when marginal values of multipliers of fixed costs and return on assets are constant. Such periods were explored by S. Kuznets.