О вкладе механохимического фактора в скорость протекания «ручейковой» коррозии промысловых нефтепроводов

Objective To investigate the clinical value of Fluorine-18-fluorodeoxyglucose (18F-FDG) PET/CT examination to predict the prognosis of patients with pancreatic cancer. Methods The retrospective cross-sectional study was conducted. The clinicopathologic data of 104 patients with pancreatic cancer who were admitted to the First Affiliated Hospital of Nanjing Medical University between February 2009 and November 2015 were collected. All the patients underwent preoperative 18F-FDG PET/CT examination. The maximum standardized uptake value (SUVmax), metabolism of volume (MTV) and total lesion of glycolysis (TLG) in primary lesion were calculated. According to the patient′s condition, chemotherapy, operation and comprehensive therapy were performed. Observation indicators included: (1) results of imaging examination before treatment; (2) treatment and follow-up; (3) analysis of prognosis factors of patients with pancreatic cancer. Follow-up using outpatient examination and telephone interview was performed to detect survival of patients up to June 2016. Measurement data with skewed distribution were represented as median (range). The survival curve was drawn by the Kaplan-Meier method and the Log-rank test was used for survival analysis. The univariate analysis and multivariate analysis were respectively done by the Log-rank test and COX proportional hazards model. Results (1) Results of imaging examination before treatment: the 18F-FDG PET/CT imaging of 104 patients with pancreatic cancer showed the slightly hypodense shadow with inordinately uptake of 18F-FDG, with an unclear boundary. The contrast-enhanced CT showed slight enhancement and hypodense, and partial lesions surrounding adjacent vessels can merge with peripheral enlarged lymph nodes. There were high 18F-FDG uptakes of lymph node metastases, hepatic metastases, adrenal metastases and bone metastases. Of 75 lesions of pulmonary metastases, 23 showed high 18F-FDG uptakes and 52 showed no high 18F-FDG uptakes. The SUVmax, MTV and TLG in primary lesion of 104 patients were 7.41 (range, 2.00-31.65), 14.86 cm3 (range, 2.17-79.65 cm3) and 66.34 (range, 5.31-598.22), respectively. (2) Treatment and follow-up: of 104 patients, 12 underwent single operation, 13 underwent operation+ chemotherapy, 53 underwent single chemotherapy and 26 underwent chemoradiotherapy. All the 104 patients were followed up for 7.0-88.0 months, with a median time of 26.0 months. The median survival time, 6-months and 1-year survival rates of 104 patients with pancreatic cancer were respectively 7.1 months (range, 1.0-42.7 months), 52% and 26%. Results of further analysis showed that the median survival time, 6-months and 1- year survival rates were respectively 6.5 months (range, 1.4-39.6 months), 49%, 27% in 51 patients with carcinoma of head of pancreas and 7.2 months (range, 1.0-42.7 months), 54%, 30% in 53 patients with carcinoma of pancreatic body and tail. (3) Prognosis factors of patients with pancreatic cancer: results of univariate analysis showed that sex, CA19-9, maximum diameter of tumor, lymph node metastases, hepatic metastases, distant metastases, clinical staging, surgery, chemotherapy, comprehensive treatment, SUVmax, MTV and TLG were related factors affecting prognosis of patients with pancreatic cancer [HR=1.603, 1.657, 2.017, 1.873, 2.668, 1.822, 2.157, 2.054, 2.154, 3.208, 1.596, 2.096, 3.411, 95% confidence interval (CI): 1.029-2.499, 1.045-2.626, 1.305-3.115, 1.181-2.971, 1.735-4.101, 1.453-2.285, 1.257-3.703, 1.245-3.387, 1.399-3.317, 2.047-5.028, 1.052-2.421, 1.372-3.201, 2.181-5.335, P<0.05]. Results of multivariate analysis showed that distant metastases, chemotherapy, comprehensive treatment and TLG≥66.34 were independent risk factors affecting poor prognosis of patients with pancreatic cancer (HR=1.906, 2.966, 2.946, 2.053, 95%CI: 1.201-3.022, 1.775-4.956, 1.753-4.951, 1.104-3.820, P<0.05). (4) Prognostic factors of patients with carcinoma of head of pancreas: results of univariate analysis showed that maximum diameter of tumor, tumor invading major vessels, hepatic metastases, distant metastases, clinical staging, surgery, chemotherapy, comprehensive treatment, SUVmax, MTV and TLG were related factors affecting prognosis of patients with carcinoma of head of pancreas (HR=2.282, 2.320, 4.125, 5.753, 6.155, 2.841, 4.144, 3.131, 2.229, 2.064, 5.380, 95% CI: 1.231-4.230, 1.098-4.903, 1.993-8.539, 2.682-12.341, 1.850-20.483, 1.362-5.926, 2.106-8.154, 1.545-6.345, 1.202-4.132, 1.121-3.803, 2.630-11.004, P<0.05). Results of multivariate analysis showed that chemotherapy and TLG≥66.66 were independent risk factors affecting poor prognosis of patients with carcinoma of head of pancreas (HR=7.953, 2.824, 95%CI: 3.110-20.338, 1.005-7.932, P<0.05). (5) Prognostic factors of patients with carcinoma of pancreatic body and tail: results of univariate analysis showed that hepatic metastases, distant metastases, surgery, comprehensive treatment, MTV and TLG were related factors affecting prognosis of patients with carcinoma of pancreatic body and tail (HR=2.083, 2.501, 3.464, 2.295, 2.231, 3.572, 95%CI: 1.157-3.784, 1.363-4.590, 1.441-8.329, 1.158-4.546, 1.166-4.268, 1.901-6.711, P<0.05). Results of multivariate analysis showed that distant metastases, MTV≥15.70 cm3 and TLG≥62.75 were independent risk factors affecting poor prognosis of patients with carcinoma of pancreatic body and tail (HR=1.700, 2.096, 4.047, 95%CI: 1.080-2.675, 1.065-4.126, 2.072-7.906, P<0.05). Conclusion TLG≥66.34, ≥66.66, ≥62.75 in 18F-FDG PET/CT examination are independent risk factors affecting poor prognosis of patients with pancreatic cancer or pancreatic head cancer or pancreatic body and tail cancer respectively, and MTV≥15.70 cm3 is also an independent risk factor affecting poor prognosis of patient with pancreatic body and tail cancer. 18F-FDG PET/CT examination has certainly reference value for prognosis of patients with pancreatic cancer. Key words: Pancreatic neoplasms; Prognosis; Tomography, emission-computed; Tomography, X-ray computed; Deoxyglucose

Modern polymer composite materials with high specific characteristics of strength and stiffness allow creating strong, durable and geometrically stable space structures. To expand the scope of application of composite materials and increase the competitiveness of space structures, it is necessary to further improve design methods with the widespread use of multiscale computational modeling of deformation and fracture processes. The paper presents the results of analysis on the strength and dimensional stability of structures made of polymer composites. A metal-composite high-pressure tank for electric propulsion systems and the design of precision reflectors for space- and ground-based antennas are considered. The methods and results of experimental and computational studies on the stress-strain and ultimate states of structures are described. The methods and means of non-destructive testing, the results of the analysis on the stress-strain state and full-scale tests of the tank structure are described. Generalized estimates of the load-carrying capacity of reflector structures under given operating conditions are given.

ABSTRACT&#x0D; &#x0D; Background: Stroke is a health problem that needs attention because stroke is the number one cause of death in the world (200 per 100,000 population in one year) and the highest cause of death in Indonesia (500,000 people with 125,000 deaths and the rest are disabled), caused by delays instroke treatment in the prehospital phase (83,9%) due to a lack of knowledge in the community, especially families, about early detection of strike. Steps that can be taken to increase knowledge include conducting education using booklet media. A booklet is a medium that can be used to convey information in the form of a book containing writing and pictures.&#x0D; Purpose: To determine the effect of education using booklet media on family knowledge about early stroke detection. Method: This type of quantitative research uses Pre-experimental design with the One-Group Pretest-Postest design approach. Sampling used a purposive sampling technique of 59 respondents, namely families with a high risk of stroke in the working area of the Nagaswidak Health Center. The study used an instrument of knowledge about early stroke detection with as many as 20 questions that had been tested for validity and reliability at the Pembiuna Palembang Health Center. The data obtained were analyzed using the Wilcoxon test. Results: The results of the analysis on the knowledge variable obtained showed that the value of knowledge before education was a median of 11 with a minimum value of 0 and a maximum value of 18, and the value of knowledge after educationwas median of 15 with a minimum value of 8 and a maximum value of 20. The results of the data analysis with the Wilcoxon test obtained a p-value of 0.000 (&lt;0.05). Conclusion: there is an effect of health education using booklet media on family knowledge about early stroke detection. Suggestions for future researchers to be able to carry out further research that focuses on the ability of families to carry out early detection of stroke with the demonstration method.&#x0D; &#x0D; Keyword: Education, Early Stroke Detection, Booklet Media, Knowledge

Today, intelligence in all walks of life is developing at an unexpectedly fast speed. The complexity of the Internet of Things (IoT) big data system of intelligent parks is analyzed to unify the information transmission of various industries, such as smart transportation, smart library, and smart medicine, thereby diminishing information islands. The traditional IoT systems are analyzed; on this basis, a relay node is added to the transmission path of the data information, and an intelligent park IoT big data system is constructed based on relay cooperation with a total of three hops. Finally, the IoT big data system is simulated and tested to verify its complexity. Results of energy efficiency analysis suggest that when the power dividing factor is 0.5, 0.1, and 0.9, the energy efficiency of the IoT big data system first increases and then decreases as α0 increases, where the maximum value appears when α0 is about 7 J. Results of outage probability analysis demonstrate that the system’s simulation result is basically the same as that of the theoretical result. Under the same environment, the more hop paths the system has, the more the number of relays is; moreover, the larger the fading index m, the better the system performance, and the lower the outage possibility. Results of transmission accuracy analysis reveal that the IoT big data system can provide a result that is the closest to the actual result when the successful data transmission probability is 100%, and the parameter λ values are between 0.01 and 0.05; in the meantime, the delay of successful data transmission is reduced gradually. In summary, the wireless relay cooperation transmission technology can reduce the outage probability and data transmission delay probability of the IoT big data system in the intelligent park by adding the multihop path, thereby improving the system performance. The above results can provide an experimental basis for exploring the complexity of IoT systems in intelligent parks.

Purpose. The article presents the results of numerical analysis of reinforced concrete structures column subway station in the case of variation step columns for safety. The purpose of this article is to examine the system of columns, as the most downloaded items, which is one of the main priorities of safe operation during normal operation of the station design. Methodology. 3D finite element model are developed. The stress applied fourth strength theory to analyze. Findings. In this article we present the results of numerical analysis by finite element method based on complex Structure CAD (SCAD) reinforced concrete encasement stations with varying pitch columns, which in most cases in the construction of stations taken constructively. Plotting possible to determine the safest column spacing. Originality. On the basis of theoretical studies of stress-strain state of the model shows that by increasing the distance between the columns from 3.6 to 5.4 m static load-bearing elements work station is quite predictable as the laws of formation of the efforts they do not go beyond the line. But the increase in step columns to substantial quantities would not be appropriate in terms of safe operating conditions and causes significant overload bearing elements during construction. Practical value. The practical value due to the evaluation of the impact of steps to change the columns station stress-strain state of its construction. Determination of stress-strain state design prevents various emergency situations, as it allows confidently predict the effects of changes in the design solutions and receive safe operating conditions stations of column type.

Increasing demand has led to shortage of potable water in many countries. The use of alternative water sources is one of the solutions undertaken to overcome this issue. Alternative water sources can be derived from either collected rainwater, treated greywater or treated wastewater. Sewer Mining is known as an efficient technology which can reduce the cost of wastewater infrastructure required to transport wastewater because the Sewer Mining facility is usually installed close to the site that is using the treated wastewater. The treated water from Sewer Mining has been used as one of the sources of alternative water, particularly to supply water for public open spaces, garden irrigation and toilet flushing. It is conducted by extracting the sewage from sewer pipes and most of the times, disposing the sludge back to sewer pipes. The sewage extraction and sludge disposal back to sewer network is suspected to trigger sewer problems such as blockages. Several applications of Sewer Mining facility have proved to contribute to the increase of blockages in sewer pipes. Furthermore, the changes in the sewage composition after the sewage extraction and sludge disposal location lead to alteration of the sewage biochemical transformation processes, which finally were suspected to change the state of hydrogen sulphide build up. Increase of hydrogen sulphide in sewage and in the sewer atmosphere could also contribute to the problem of odour and corrosion in sewers. This study attempts to model the impact of Sewer Mining on odour and corrosion in sewer systems. A residential area in northern Melbourne was used as a study area. In this study, four Sewer Mining scenarios were considered, consisting of Base Case (BC), Sewer Mining 1 (SM1), Sewer Mining 2 (SM2) and Sewer Mining 3 (SM3). The scenarios were configured based on the volume of sewage extraction. Base Case is the scenario representing the existing condition of water and wastewater use in the study area and there was no Sewer Mining facility in the area. Sewer Mining 1, 2 and 3 represent the scenarios when the Sewer Mining is undertaken and the sewage extraction was adjusted to supply 25%, 50% and 70% of the households in the study area. The location of sewage extraction and sludge disposal was fixed at the middle of main sewer pipe network and was not changed for each scenario. The treated water from the Sewer Mining facility was supplied as water for toilet flushing. Two modeling tools were used for this analysis, the first was an urban wastewater generation model and the second was a sewage transformation (and generation of hydrogen sulphide) model. The output of the first model, namely wastewater flow discharge and contaminant concentration were fed to the second modeling tool. Wastewater generation from the households was simulated in the first modeling tool while Sewer Mining practice was modeled in the second modeling tool. Its impact was analyzed in the sewer pipes downstream of the Sewer Mining facility. The analysis results were obtained by comparing the result from Sewer Mining scenarios 1, 2 and 3 with the Base Case. The difference in total sewer flow, hydrogen sulphide gas production, corrosion rate and the pipe lifetime were the analysis parameters that are discussed in this paper. The results showed that Sewer Mining led to reduction in hydrogen sulphide concentration immediately after the sewage extraction point, but further downstream, the hydrogen sulphide concentration was extremely high. The hydrogen sulphide concentration at the outlet of sewer pipes network for SM1, SM2 and SM3 scenarios had increased up to three, five and eight times respectively, when compared to the hydrogen sulphide concentration in the Base Case. Increase of hydrogen sulphide concentration consequently lead to increase in odour occurrence and corrosion rate which eventually reduce the sewer pipe lifetime. The pipe lifetime at the outlet of sewer network reduced by 204 years, 262 years and 293 years after implementing the scenarios of SM1, SM2 and SM3, respectively. The distance where the extremely high hydrogen sulphide generation occurred was very much determined by the volume of extracted sewage and the location of extracted sewage and sludge disposal.

This paper is dedicated to the influence of partial deforestation with using global retrospective modelling data from The Land Use Model Intercomparison Project (LUMIP) for the territory of Ukraine. This experiment aims to global gradual deforestation and has two phases. The first phase, defined as the pre-industrial period (1850—1899) with constant unchangeable anthropogenic impact. For this period deforestation modelled with further replacement with grass cover with a linear trend 400000 km2/yr or 20 million km2 per 50 years in general. The second phase is next 30 years with no significant changes in forest cover (1900—1929). For conducting this research the data of several global climate models were applied. The results of analysis have demonstrated that a partial deforestation with grass substitution influences the surface reflectivity or albedo and redistribution of shortwave radiative fluxes. In turn, it provokes changes in thermal regime. It was found that the most significant changes in surface reflectivity and the strongest correlation coefficients between albedo and deforestation are in the winter season due to the presence of snow cover. As a result, statistical significant increase of albedo is with maximum values up to 24 %/50 years in some grids in winter. Then in the summer season maximal changes are up to 2.7 %/50 years due to small differences between forest and grass albedos. As a consequence, changes in albedo cause changes in surface and air temperature regimes. Strong dependencies were found in winter between changes in albedo and temperatures with maximum temperature decrease 2.5…2.0 %/50 years. In warm season correlations are weaker in comparison to cold season, but nevertheless, temperatures decrease also take place with maximum values 2.0…1.5 %/50 years. The analysis between deforestation and daily air temperature range has shown that particularly in winter season there is an increase of 0.5...1.5 %/50 years, whereas such tendency is not observed in warm season. Calculations of year air temperature range demonstrated controversial results among climate models, as follows it is hard to make a conclusion about the contribution of forest cover reduction to changes in this index. It was revealed, that global climate models with higher resolution are more sensitive to changes in albedo and, as a consequence to other characteristics than models with coarse ones. It should be noticed that obtained results concern pre-industrial period with minimal anthropogenic impact, when observed a stable snow cover in winter in Ukraine. In the current climate change with significant warming and reduction of snow season duration deforestation can have opposite effects on radiative and thermal regimes that require further studying.

The problem of taking into account a non-stationary inhomogeneous temperature field in the analysis of the stress-strain state of inductor systems for magnetic-pulse processing of materials is considered. It follows from the analysis of open information sources that the problem of analyzing a non-stationary temperature field arising from the presence of a non-uniform electromagnetic field and its effect on deformation has been sufficiently studied in relation to induction heating. At the same time, during other operations of magnetic-pulse processing of materials, heating of equipment can cause additional deformations of a significant magnitude, which, in turn, can lead to a loss of equipment performance due to destruction or irreversible deformation. A general approach to the analysis of such problems is proposed, which involves the determination of the spatial-temporal distributions of the quantitative characteristics of the electromagnetic field, temperature field and stress-strain state. The necessity of using numerical methods for carrying out such an analysis has been substantiated. The most effective numerical method is the finite element method, which makes it possible to analyze the unsteady electromagnetic field, temperature field, and stress-strain state within the same calculation scheme. In this case, within the framework of the finite element method, iterative schemes can be created that allow taking into account nonlinear effects. Here, nonlinear effects can be due to the dependence of the mechanical and electro-physical properties of the material on temperature, the plastic nature of deformation, and the need to take into account contact phenomena. The results of complex analysis for a composite single-turn inductor with a dielectric band are presented. The features of contact interaction were taken into account by introducing layers of contact finite elements. The stress-strain state of the inductor is estimated for two variants of the materials used: copper and non-magnetic steel.

The corrosion characteristics of various steels used by ocean wave energy equipment in sea water are investigated by electrochemical tests in this paper. The electrochemical experiments are carried out to research the corrosion rules of Q235, 20# steel, 16Mn and X42 through contrast experiments. Polarization curves and electrochemical impedance spectroscopy (EIS) are got by electrochemical workstation. Corrosion rates and corrosion potentials are analyzed from the polarization curves, and corrosion rules are founded. In addition, EIS is analyzed, and the analysis results are consistent with the results of polarization curves.

The article presents the results of studies of the stress–strain state of a distillation column and hydraulic lifting during the installation process of the equipment, the calculation of the so-called hydraulic lifting force in order to form the initial data. From the obtained initial data, the installation process was simulated, which includes: a foundation platform with a mounting hinge for columns; foundation area for two racks of a hydraulic lift; two racks of a hydraulic lift; column apparatus, consisting of two bottoms, supports, shells; saddles; two carriages with a jack. Modeling SolidWorks and SolidWorks Motion to obtain data (epure) on stress and deformation in bottlenecks using a distillation column and hydraulic lift. The results of SolidWorks Motion and structural analysis of SolidWorks Simulation allow us to determine the maximum stress and strain in narrow structures when lifting column equipment with a hydraulic lift based on design training. The initial data from the analysis of the obtained data (stress–strain state) allow us to conclude on the nature of static loads in narrow structures and give recommendations on the development of measures aimed at reducing or eliminating their negative consequences for the life and operation of a distillation column and hydraulic lift.

Elastic-plastic analysis of a nozzle corner crack by finite element method

The paper presents the results of an elastic-plastic three-dimensional finite-element analysis for a nozzle corner crack in a pressurized reactor test vessel. The calculations were performed by the finite-element program ADINA using the von Mises yield condition and isotropic hardening. The crack plane was taken parallel to the axis of the vessel and the crack front straight and perpendicular to the symmetry line of the nozzle corner in order to obtain the worst position for a nozzle corner crack. The calculations were performed up to that pressure level where general yield of the ligament in the nozzle corner section takes place. For the chosen crack length, which is relatively small in comparison with the ligament, the stress normal to the ligament plane and the crack-opening displacement have a maximum in the center of the crack. The differences between the maximum and minimum values along the crack front increase rapidly in the plastic range when the pressure load is raised above half of the general yield pressure. The results of the finite-element analysis are compared with figures obtained from analytical procedures of elastic-plastic fracture mechanics.

&lt;p&gt;&lt;em&gt;The PPCW railroad flatcars is railroad flatcars used to transport container loads with a maximum load capacity of up to 42 tons. In its use, these railroad flatcars are used to transport the cement bags in the pallet arrangement resulting in crack in the bottom frame of the PPCW railroad flatcars structure. The purpose of this analysis is to find out stress value and deformation value that occurred in the railroad flatcars due to the cement bags loading. The analysis process begins with modeling according to the original size of the railroad flatcars which is then followed by providing the support, gravity, loads, and material specifications used. Based on the result of analysis that has been obtained from the load of cement bags of 546,000 N and ratchet lashing of 900,000 N on the frame of PPCW railroad flatcars, we obtained the maximum von Mises stress value of 231.91 MPa arising on the bottom frame of the PPCW railroad flatcars structure as the site of cracking and the maximum total deformation value of 19.526 mm arising in the center of the railroad flatcars. The PPCW railroad flatcars made from SS400 with yield strength value of 245 MPa. Therefore, it was found that the value of stress arising in the railroad flatcars is still in the safe area and is allowed&lt;/em&gt;&lt;em&gt;.&lt;/em&gt;&lt;em&gt;&lt;/em&gt;&lt;/p&gt;

The objective of this study was to determine the effect of the quality of good corporate governance disclosure, leverage, and firm size on profitability of Islamic commercial banks in Indonesia and Malaysia. The data was obtained from the websites of each bank in the period 2011-2017 with a total sample of 16 Islamic commercial banks in Indonesia and Malaysia. The data analysis technique used in this study was panel data regression analysis. Based on the results of analysis and testing that examined the effect of Quality of Good Corporate Governance (GCG) Disclosure, Leverage, and Firm Size on Profitability on Islamic Commercial Banks in Indonesia and Malaysia registered in each WEB of Islamic banking in the 2011-2017 observation period. Then the empirical results were obtained as follows: The quality of disclosure of GCG did not affect the profitability of Islamic commercial bank inIndonesia and Malaysia, it was because companies find it difficult to understand and feel only to burden the company's finances and think that disclosure was not profitable for the company. Leverage did not affect profitability because the Islamic commercial banks in Indonesia and Malaysia had a mean (average) of leverage value for the period 2011-2017 of 7.36%, which means it is still a small category where the maximum leverage value is 150% and for finance companies is 600% . So that the leverage variables of each Indonesian and Malaysian Islamic banking had no effect on profitability. Meanwhile, firm size had an effect on the profitability of Indonesian and Malaysian Islamic banking, because the greater the company's assets could increase the value of profitability.

The goal of this research is determination the values average basic wood’s density in the bark of Pinus silvestrys (Scots pine) and Robinia pseudoacacia (black locust). It is established the depending of searching parameter from the main biometric characteristics of trees such as age, diameter of the trunk on the height 1.3 m (d1,3) and height (h) of the trees. The experimental data to determine basic wood density obtained on the thirty temporary plots (sample), where were felled thirty model trees and carried out their evaluation by the fraction. The basic wood’s density in the bark was analyzed according to the main biometric indexes the model trees: age, diameter and height of tree. For the studied species, both for Scots pine, and black locust noted the gradual increase the average basic wood’s density in the bark with growing age of the trees. Thus, for Scots pine fixed the minimum value (245 kg·(m3)-1) of basic wood’s density for the sample in the youngest age, and then recorded the temperate increase this parameter. The maximum value fixed for the oldest sample (90 years). By analyzing of the change average basic wood density in the bark of black locust found that the maximum value of this index (605 kg·(m3)-1) was recorded for trees in the age 84 years that belonging to the overmature age group, while the minimum value (438 kg·(m3)-1) have the trees in the age 30 years. The distinctions in the value of the average basic density are 27.6%. More high value of basic wood’s density in the bark have the black locust sample compared with Scots pine. The percentage difference between the maximum value of both investigated species is 22.5%. The average basic wood’s density is characterized by increasing type with the age. It was observed both for Scots pine, and black locust. The established dependence of changes of wood basic density of black locust can be related with the proportionate changes in parenchyme tissue and structural elements of xylem vessels. The value of the average basic wood’s density increases with growing diameter at breast height and reaching the maximum values 439–469 kg·(m3)-1) in the Scots pine sample with diameters from 24.3 to 26.1 cm, and then decline. The absolute value of the average basic wood density in the bark is characterized by the significant variation relative to the trend line. The average basic wood’s density in the bark depending on the height tree. The highest index (469 kg·(м3)-1) established for the sample with a height of 22.3 m. Within these altitudes are concentrated the highest values ​​of the studied parameter. Analyzing the data in another study species (black locust) it should be noted that the basic wood’s density in the bark is the constant value. There is observed a few variation of the values ​​of basic wood’s density in bark relative trend line. This fact can be explained by the different age of the sample of Robinia pseudoacacia and its impact on the basic wood’s density in the bark. Thus, this index gradually increases with the aged trees and with the increase diameter and height and then decreases for trees with a maximum diameter (27.4 and 28.6 cm) and height (21.6 and 22 7 m). The maximum value the basic wood’s dencity in the bark (605 kg·(m3)-1) fixed for the sample black locust with a height 24 m and the diameter 15.7 cm. The results of correlation analysis shown the close correlation between the value average wood’s density in the bark both for black locust, and Scots pine with a diameter 1.3 m and height of trees. All correlation coefficients of basic wood’s density in the bark for both studied species with the diameter and height of trees, or else the density of these indexes have a direct relationship. Closely (r = +0,61+0,62) correlation found for basic wood’s density in the bark for Scots pine with height trees, while for black locust the closely correlation found with both studied biometric parameters as for diameter and height. The average wood’s density in the bark of Scots pine is a few weak (r = +0,55), but significant correlation with stem diameter. Overall, the studied parameters change with the diameter and height of the trunk and depend on the age of the tree. Identified laws allow to establish of the mathematic depends for assessing components of biomass stem. It is necessary to study the biological productivity of forests.