Rotational Intensity Research Articles

Earthworms contribute to ecosystem process in no-till systems with high crop rotation intensity in Argentina

In the Pampas region of Argentina agriculture is dominated by intensive no-till (NT) soybean cropping which produce negative consequences on soil quality. A group of farmers started to use the Good Agricultural Practices (GAP) which include a higher crop rotation, use of winter cover crops and nutrient restoration. In this NT system earthworms have a significant role in soil functioning, particularly in organic matter cycling and soil structure formation. The aim of this paper was to examine the contribution of earthworm activity to the process of C incorporation and soil structure maintenance in soils with different NT variants of: NT with GAP for 30 years (NT + r30); NT with some of the GAP for 12 years (NT-r12) and NT with soybean monoculture (NTm). Also a natural grassland (NA) was sampled as a reference. Earthworm aggregates were obtained by gently separating them from surrounding soil. Fine (HOC) and coarse (POC) organic matter fractions, water-stable aggregates (WSA) and mean weight diameter (MWD) were calculated for earthworm aggregates and bulk soil. In all sites only one species (Aporrectodea caliginosa) was found, with higher density in the NA, followed by NT + r30, that had about 9 times more earthworms than NTm. The number of earthworm aggregates was higher in the NT + r30 followed by the NA, both showing differences with the other NT systems. The earthworm aggregates in NA and NT + r30 had significantly more POC than the surrounding soil (230% increase in NA and 100% NT + r30). Earthworm casts had higher values of MWD and WSA than physical soil aggregates in both NA and NT + r30 management treatments. Our results show the existence of a positive feedback loop we called earthworm-driven virtuous cycle. The increase in earthworm abundance promotes higher production of earthworm aggregates which are richer in organic matter and more water stable than the surrounding soil. This has favourable results in terms of soil quality but also increase crop yields (57% in maize and 18% in soybean), by means of biologically mediated soil processes, which is a highly desirable way to sustainability of agricultural production. Farmers, politicians and the whole society should pay more attention to soil as a key component supporting agricultural production by means of internal biological soil functioning.

Brain Tumor Segmentation Based on Improved Convolutional Neural Network in Combination with Non-quantifiable Local Texture Feature.

Accurate and reliable brain tumor segmentation is a critical component in cancer diagnosis. According to deep learning model, a novel brain tumor segmentation method is developed by integrating fully convolutional neural networks (FCNN) and dense micro-block difference feature (DMDF) into a unified framework so as to obtain segmentation results with appearance and spatial consistency. Firstly, we propose a local feature to describe the rotation invariant property of the texture. In order to deal with the change of rotation and scale in texture image, Fisher vector encoding method is used to analyze the texture feature, which can combine with the scale information without increasing the dimension of the local feature. The obtained local features have strong robustness to rotation and gray intensity variation. Then, the non-quantifiable local feature is fused to the FCNN to perform fine boundary segmentation. Since brain tumors occupy a small portion of the image, deconvolutional layers are designed with skip connections to obtain a high quality feature map. Compared with the traditional MRI brain tumor segmentation methods, the experimental results show that the segmentation accuracy and stability has been greatly improved. Average Dice index can be up to 90.98%. And the proposed method has very high real-time performance, where brain tumor image can segment within 1s.

Performance investigation of magnetorheological finishing of rolls surface in cold rolling process

Cold rolling is one of the most vital manufacturing operation in the sheet metal industries. It produces controlled size and accurate thinner gauge components with a smooth surface. In cold rolling operation, the rolls are the most important component. If rolls surface gets finished at a greater level, a smooth surface on the final products can be achieved. This may improve functional performance for their practical use. To accomplish this requirement, the magnetorheological (MR) finishing process using rectangular-rotating tool core tip has been used to finish the external surface of the rolls. The process parameters such as roll workpiece rotation, tool feed, tool rotation, working gap and current intensity of the electromagnet and composition of MR polishing fluid are considered to investigate the performance of cold rolling rolls using the rectangular-rotating core tip-based MR finishing process. For effectively performing the MR finishing operation, the optimum process parameters are predicted by using the response surface methodology. These optimum parameters have been used to perform the MR finishing on the external surface of the industrial H13 die steel rolls as used in cold rolling process. The surface roughness gets reduced to 18 nm from the initial ground roughness value of 200 nm. After the MR finishing operation, the cold rolling rolls are tested its functional performance in the industry. The performance of the MR finished rolls surface is investigated as compared with the ground rolls surface. Experimentally and theoretically analyse the roll force, roll torque, and power consumption on use of before and after MR finished rolls surface in cold rolling operation. Almost all the performance parameters with MR finished rolls surface are found in favour of improvement in functional operation during its actual application in the cold rolling process.

Aerodynamic noise assessment for a vertical axis wind turbine using Improved Delayed Detached Eddy Simulation

This paper presents the results of the aerodynamic and aeroacoustic assessment for a vertical axis wind turbine (VAWT). The Improved Delayed Detached Eddy Simulation (IDDES) technique and Ffowcs Williams and Hawkings (FW-H) acoustic analogy method are adopted to simulate instantaneous flow field and to perform the noise prediction in the far field. The CFD model is verified against available experimental data for the power coefficient. The acoustic pressure spectra of thickness, loading, and quadrupole noise are presented, and the mechanisms and contributions of different noise are discussed. The effects of increasing rotational speed, receiver distance and turbulence intensity are studied. The results indicate that the thickness and loading noises are the dominant noise sources, while the influence of quadrupole noise is not negligible when the Mach number increases. Higher tip speed ratio and increased loads on blades will generate larger thickness and loading noise. In addition to the changes in lift and drag forces, higher turbulence intensity will make stronger interaction between vortex structures and blades, thereby induces a higher level of noise. It is concluded that this work could be exploited to design quieter vertical axis wind turbines and to locate the wind turbine position that minimizes noise pollution.

Ozone intensities in the rotational bands

This note provides a citable reference to a database reconciliation effort for ozone pure rotational intensities. The permanent dipole moment and theoretical adjustments for centrifugal distortion are utilized in a predictive calculation that is compared to experimental measurements. This prediction has been available in the JPL spectral line catalog since 2005, but has been at odds with the HITRAN database, which was originally based on an atlas provided by Flaud (HITRAN 1992) and subsequently scaled by 4% (HITRAN 2004). Using a modified partition function and isotopic abundance factor, the JPL 2005 prediction has now been utilized to create a self-consistent entry as an interim update to the HITRAN2016 database. Ramifications of the intensity change for users of HITRAN versions 2004–2012 are discussed. New pure rotational intensity measurements were carried out supporting the validity of the JPL 2005 database.

Comparison subpolar mesopause OH(6-2) temperature over Yakutia with the calculated data of NRLMSISE-00 model for 1999-2015

The analysis of changes in temperature of mesopause region based on fluctuation measurements of rotational temperature and intensity of molecular emission of hydroxyl OH (6-2) excited at ∼87 km altitude is presented. Observations were carried out at the Maimaga station (63°N, 129.5°E), at a distance of 120 km to the north from Yakutsk. Measurements were conducted with a digital infrared spectrograph. The temperature was determined from the distribution of the emission intensity in the different branches of the molecular hydroxyl band. Comparison OH(6-2) temperature with the calculated data of NRLMSISE-00 model was defined based on the data received from 1999 to 2015. 2320 midnight temperature values of hydroxyl OH (6-2) suitable for comparison were obtained at the Maimaga station over 16 years of measurements. The NRLMSISE-00 model describes temperature changes at the height of the mesopause region from October to April within the experimental fluctuations with a seasonal temperature variation of ∼ 35 K, deviations from the experimental values are no more than 7 ± 4 K. A correlation analysis was performed to compare the rotational temperature OH (6-2) and the NRLMSISE-00 model calculations. When the number of observations at the station Maimaga more than 180 days (about six months) correlation coefficient R> 0.7. This means that the NRLMSISE-00 model accurately describes the temperature changes of the subauroral mesopause.

26 Dosimetric comparison of 3 TPS in rotational intensity modulated irradiation of breast and regional lymph nodes

Introduction Intensity modulated radiotherapy allows to significantly reduce the toxicity to organs at risk (OAR) in radiotherapy of breast cancer while allowing proper coverage of the planning target volumes (PTV). The purpose of this study is to perform a dosimetric comparison of 3 TPS used in our department for the planning of rotational intensity modulated treatment of breast and the following regional nodes: supra and infraclavicular (level IV,III and II nodes) and internal mammary nodes (IMNs). Methods 10 patients treated for breast cancer and regional nodes (IV, III, II and IMNs) were selected (5 left breasts and 5 right breasts). Prescription doses, delivered in 28 fractions, are 50.4 Gy in the whole breast and the regional nodes, and 63 Gy in the tumor bed (integrated boost). Treatment plans were designed using the 3 following treatment planning systems: Eclipse 13.6 with Photon Optimizer inverse planning algorithm (Varian Medical Systems), RayStation 6.1.1.2 (RaySearch Laboratories AB) and TomoTherapy Planning Station (PS) with VoLO and TomoEdge (Accuray Inc.). Eclipse and RayStation plans were designed using modulated volumetric arc-therapy (VMAT) with 4 partial arcs of 230° amplitude each, while TomoTherapy plans were designed with dynamic jaws, a 5 cm field width and a modulation factor of 3.5. All plans were exported to Artiview (Aquilab) to calculate for each PTV the homogeneity index (HI = D2-D98/ D50), the CN conformal index (Riet, 1997), the volume covered by isodose 95% of the prescribed dose and the near-maximum dose (D2%). For each plan, the low-dose volume (V5Gy,) the mean doses to the heart, ipsilateral lung, contralateral lung and breast were recorded. Results Preliminary results involve 5 patients (3 left breasts and 2 right breasts) and are summarized in Table 1. All treatment plans met acceptable PTV coverage (V95% > 95% for each PTV) as well as OAR medical constraints that are based on our clinical experience. However in the regional nodes and in the breast, even at a certain distance from the tumor bed, some plans for the 3 TPS have D2% greater than 107% of the prescribed dose. Download : Download high-res image (121KB) Download : Download full-size image Conclusion This preliminary study shows that the 3 TPS presented here are reliable for the planning of rotational intensity modulated treatment of breast and the regional nodes. Further work will involve the inclusion of a higher number of patients to undertake a more in-depth statistical analysis.

Weed phytosociological in irrigated rice under different cultivation systems and crop rotation intensity

ABSTRACT: This research aimed to evaluate the phytosociology of weeds in irrigated rice in different soil management systems and crop rotation intensity. Therefore, two field studies were carried out. Study 1 was conducted in an area that has been cultivated since 1994 with three cultivation systems: direct, pre-germinated and conventional ones. Study 2 was carried out in an experimental area in five Integrated Farming Systems, with crop rotation. Phytosociological evaluations were conducted when rice was fully blooming, in the first study, and when grain filling was ending, in the second study. Pre-germinated system of rice cultivation has predominance of aquatic weeds. Conventional system when compared with direct sowing has lower weed densities. Integrated Agricultural Production Systems with higher intensity of crop rotation have been higher infested of perennial species.

A 3-Year Study of Resident Reaction to 2011 ACGME Work Hour Rules in a Family Medicine Residency.

2011 Accreditation Council for Graduate Medical Education (ACGME) work hour rules prompted concerns regarding potential negative impacts on patient care and resident education. We were interested in resident reaction to call restructuring and night oat (NF) in a family medicine residency over 3 years following implementation of the 2011 rules. We conducted structured interviews of residents from 2011-2012 through 2013-2014. Interviews were recorded, transcribed, and analyzed for themes. Fifty-eight interviews were conducted, including 18/18 residents in 2011-2012 (100%), 18/20 residents in 2012-2013 (90%), and 22/22 residents in 2013-2014 (100%). Following introduction of the 24-hour work limit, upper year residents reported significantly less fatigue and improved personal lives, patient care, and educational experience. Reactions to NF varied with length and intensity of the NF rotation; most PGY-1 residents reported increased fatigue, more burnout, and worse personal lives on NF. Most residents felt patient care quality on NF did not differ from non-NF rotations because improved inpatient nighttime continuity mitigated effects of fatigue and increased care transitions. Reactions regarding educational experience on NF were initially negative, but improved over time. Residents' reactions to 2011 ACGME work hour rules suggest the rules improved resident well-being, except on NF. Negative effects of NF may be minimized by limiting NF rotations to 5 nights/week for 2 consecutive weeks, and 1 month total per academic year.

Interannual dynamics in intensity of mesoscale hydroxyl nightglow variations over Almaty

The method of digital difference filters is applied to the data analysis of SATI observations of hydroxyl nightglow intensity and rotational temperature at altitudes 85–90 km over Almaty (43°03' N, 76°58' E), Kazakhstan, in 2010–2017. We examine seasonal and interannual variations in monthly average values and standard deviations of variations with periods 0.4–5.4 hrs, which may be associated with internal gravity waves in the mesopause region. The monthly average temperature near the mesopause has a maximum in winter and a minimum in June. The monthly average intensity has an additional maximum in June. Standard deviation of mesoscale rotational temperature variations and characteristics of internal gravity waves are maximum in spring and autumn. The spring maximum of mesoscale OH emission intensity variations is shifted to June. Interannual variations and multi-year trends of OH rotational temperature and emission intensity may differ in detail. This may be connected with seasonal and long-term variations in the complex system of the photochemical processes, which produce the OH nightglow.

Межгодовые изменения интенсивности мезомасштабных вариаций ночного свечения гидроксила в Алма-Ате

The method of digital difference filters is applied to the data analysis of SATI observations of hydroxyl nightglow intensity and rotational temperature at altitudes 85–90 km over Almaty (43°03' N, 76°58' E), Kazakhstan, in 2010–2017. We examine seasonal and interannual variations in average monthly values and standard deviations of variations with periods 0.4–5.4 hrs, which may be associated with internal gravity waves in the mesopause region. The average monthly temperature near the mesopause has a maximum in winter and a minimum in June. The average monthly intensity has an additional maximum in June. Standard deviation of mesoscale rotational temperature variations and characteristics of internal gravity waves are maximum in spring and autumn. The spring maximum of mesoscale OH emission intensity variations is shifted to June. Interannual variations and multi-year trends of OH rotational temperature and emission intensity may differ in detail. This may be connected with seasonal and long-term variations in the complex system of the photochemical processes, which produce the OH nightglow.

Numerical study on flow and heat transfer behavior of vortex and film composite cooling

The complete vortex and film composite cooling model is established to study the flow and heat transfer behavior. Influences of coolant Reynolds number, film hole diameter and inject angle on vortex and film composite cooling property are thoroughly discussed. Results show that the vortex nozzle coolant mass flux increases along the vortex chamber axial direction, while the film hole coolant mass flux and blowing ratio decrease along the vortex chamber axial direction. The internal heat transfer intensity will increase along the vortex chamber axial direction. The adiabatic film cooling efficiency decreases downstream due to counter rotating vortex pairs (CRVP) lift off wall effects. The coolant rotational velocity in vortex chamber increases with the increasing Reynolds number, thus leading to obvious heat transfer enhancement. An increase in Reynolds number results in an increase in CVRP intensity, hence the adiabatic film cooling efficiency will turn lower. The coolant rotational velocity and internal heat transfer intensity will decrease with the increase of film hole diameter. The CRVP intensity and film hole jet coolant mass flux increases with the increasing film hole diameter, leading to an increase in adiabatic film cooling efficiency. The rotational coolant flow and heat transfer intensity are not sensitive to inject angle. As the inject angle increases, the CRVP intensity changes little and the inject coolant owns larger inclined angle with gas mainstream flow, therefore the adiabatic film cooling efficiency will increase.

REGRESSION ANALYSIS OF ROTATIONAL INTENSITY, CROP DIVERSITY INDEX, LAND UTILIZATION INDEX AND YIELD EFFICIENCY IN BIO-INTENSIVE AND CONVENTIONAL FARMING SYSTEMS IN NEPAL

This study was conducted in Udayapur district, Nepal. A questionnaire-basedsurvey with 100 household heads along with field visit and personal interactionwith the concerned farmers were conducted to gather required information. Datawere analyzed to compute rotational intensity (RI), crop diversity index (CDI),land utilization index (LUI), and yield efficiency (YE). Regression analyses weredone to reveal relationships among these traits. Bio-intensive farming system(BIFS) farmers were found to practice scientific crop rotation substantially morethan conventional farming system (CFS) farmers both in rice-based and maizebasedcropping systems. In this study, higher RI, CDI, LUI and YE were found insustainable bio-intensive farming system (BIFS) as compared to conventionalfarming system (CFS). The study has revealed strong positive relationship of RIwith CDI and LUI in BIFS, CFS and in general. Cropping system both in BIFS andCFS with scientific crop rotation that ensures higher CDI and LUI is recommendedfor increasing yield efficiency. Direct positive relationship among RI, CDI and LUIhas been revealed by this study as a rule; and has suggested to be used in validatingyield efficiency of optional farming system as compared to the mainstreamconventional farming system.

Experimental and numerical investigation on the blade angle of axial-flow swirling generator and drainage structure for supersonic separators with diversion cone

The effect of axial-flow swirling generator and drainage structure with diversion cone on separation performance is very important to supersonic separators. But there is in the absence of experimental studies on separation characteristics of above-mentioned structure. In this paper, both experimental and numerical methods are utilized to investigate the influences of swirling generator and drainage structure. Good agreements are achieved between experimental data and high-order numerical simulation. The results demonstrate that the rotation strength decreases as the outlet angle of the swirler increases. The rotational flow causes the inconsistency of the radial distribution of the fluid in the nozzle and the inconsistency is more noticeable with the increase of rotation intensity. So the blade angle of swirling generator should be determined to find the balance between the expansion characteristic and swirling flow. Comparing two types of drainage structures, the internal extension structure has seriously damaged the supersonic flow in the nozzle, while the flush type drainage port has less influence on fluid. And the smaller outlet angle of drainage port can reduce the effect of drainage port on supersonic flow. When the pressure ratio is 1.4 for the flush type drainage structure, the optimal structural parameter is that the outlet angle of swirler is 55° and the inclination of the drainage structure is 22°. Under the optimum conditions, the ethanol removal rate is 57.06%.

Gas-particle turbulent flow of foursquare tangential jets in a simplified pulverized-coal firing boiler

An experimental cold-model of a simplified tangential firing boiler was established to investigate the mesoscale turbulent flow behaviors, including gas vortex structures, particle motions and interactions between two phases. A modified PIV technology, employing two pairs of lasers and cameras, was applied to measure the velocity and velocity gradient of turbulent flow in foursquare tangential jets alternatively. At a given initial gas velocity and particle mass loading, the interaction between gas and particles was studied at three different particle sizes. It was found that two main coherent vortex structures, circular eddy and hairpin eddy, distributed mainly in low speed area and heavy impingement area, respectively. The characteristics of particle motion in foursquare tangential jets correlated with gas turbulence dissipation, particle size, particle concentration and particle density. Small particles were easily entrained by gas vortex, so that they consumed more turbulence energy and attenuated the gas turbulence intensity. On the contrary, large particles had more inertia and led to heavier impingement in the chamber center, resulting in particle random distribution and complex momentum transfer between gas and particles. Moreover, large particles stretched the coherent vortex to be narrow and long, while small particles pulled down the vortices rotation intensity.

Influence of the Rotational Charge Motion on the Processes of Nitrogen Oxide Formation and Nonstationary Heat Transfer in a Hydrogen Diesel

The concept of a hydrogen diesel with direct gaseous hydrogen injection, despite the obvious advantages as compared to a traditional diesel, is poorly explored. In this article, the problem of the determination of the rotational charge motion intensity value in a hydrogen diesel cylinder is first formulated and solved in order to establish the limits for the emission of nitrogen oxides and the heat loads on the main parts (on a piston) of a motor under the hydrogen combustion. These parameters, which determine the environmental characteristics and the thermal stress state of a hydrogen diesel, can be regulated by varying the advance angle of the hydrogen injection under the acceptable values of the performance parameters of a motor. The optimal values (in terms of minimizing the emission of nitrogen oxides and the heat loads) of the rotational charge motion intensity and the advance angle of the hydrogen injection were determined for the case of a one-cylinder hydrogen diesel.

Long rotation swidden systems maintain higher carbon stocks than rubber plantations

Conversion of shifting cultivation to rubber (Hevea brasiliensis) plantations is one of the dominant land use changes in montane mainland areas of Southeast Asia, with the area of rubber expected to quadruple by 2050. However, the impacts of this transition on total ecosystem carbon stocks are poorly quantified. We undertook a chronosequence study to quantify changes in ecosystem carbon stocks following conversion from swidden agriculture to rubber plantations in Northern Laos. We measured above-ground biomass stocks and collected volume specific soil samples across rubber plantations established between 2 and 18 years prior to the study, and fallows used in a swidden system. The carbon stock in the upper 40 cm of the soil was almost 20% lower after 18 years of rubber than in the swidden system fallows, suggesting a SOC loss of 0.74 ± 0.2 Mg C ha−1 yr−1. Rates of biomass accumulation in fallows were 1.5 ± 0.12 Mg C ha−1 yr−1 and 1.9 ± 0.14 Mg C ha−1 yr−1 in rubber plantations. When comparing time-averaged carbon stocks of swidden systems to rubber plantations with 30 year rotation periods, the stocks of swidden systems with rotation times of 5 and 10 years were 19% and 13% lower respectively; the stock of swidden systems with a rotation time of ∼15 years was approximately equal to rubber; and the stock of swidden systems with a rotation time of 30 years was 11% higher than in rubber. Therefore, we conclude that the replacement of swidden agriculture with rubber leads to soil carbon losses, but the overall effects on ecosystem carbon stocks depend on the rotation intensity of the swidden system that is being replaced.

The electron beam diagnostic of the clustered supersonic nitrogen jets

Axial and radial distributions of the rotational temperature and density of N2 molecules in supersonic nitrogen jets formed with conic nozzles (critical diameters dcr of 0.17 and 0.21 mm) were studied using the electron beam fluorescence technique at stagnation pressures P0 of 0.1-0.6 MPa. A rotational temperature Tr, equaling a gas temperature Tg owing to fast RT relaxation, was obtained using the rotational line relative intensity distribution in (0-1) vibrational band of the N2 first negative system. Gas density profiles in the jets were obtained using the integral intensity of the band. It is found, Tr at the nozzle outlet is of the order of a few tens of Kelvin and at further expansion Tr drops up to 15-20K at distance of (100-200) dcr. The gas temperature and density distributions in the studied supersonic nitrogen jets are not similar to the isentropic distributions. It is shown that the lower is the stagnation pressure the faster the gas density and temperature decrease with distance from the nozzle. Increase in P0 leads to elevating Tg in the jets. A reason for this effect may be cluster formation in the jets. Estimations of cluster mean sizes in the jets using Hagena’s parameter show presence of large clusters (M≥200) at P0 = 0.4-0.6 MPa.

Semidiurnal tidal activity of the middle atmosphere at mid-latitudes derived from O2 atmospheric and OH(6-2) airglow SATI observations

In this paper, we investigate the tidal activity in the mesosphere and lower thermosphere region at 370N using OH Meinel and O2 atmospheric airglow observations from 1998 to 2015. The observations were taken with a Spectral Airglow Temperature Imager (SATI) installed at Sierra Nevada Observatory (SNO) (37.060N, 3.380W) at 2900 m height. From these observations a seasonal dependence of the amplitudes of the semidiurnal tide is inferred. The maximum tidal amplitude occurs in winter and the minimum in summer. The vertically averaged rotational temperatures and vertically integrated volume emission rate (rotational temperatures and intensities here in after), from the O2 atmospheric band measurements and the rotational temperature derived from OH Meinel band measurements reach the maximum amplitude about 1–4 h after midnight during almost all the year except in August–September where the maximum is found 2–4 h earlier. The amplitude of the tide in the OH intensity reaches the minimum near midnight in midwinter, then it is progressively delayed until 4:00 LT in August–September, and from there on it moves again forward towards midnight.The mean Krassovsky numbers for OH and O2 emissions are 5.9±1.8 and 5.6±1.0, respectively, with negative Krassovsky phases for almost all the year, indicating an upward energy transport. The mean vertical wavelengths for the vertical tidal propagation derived from OH and O2 emissions are 35±20 km and 33±18 km, respectively. The vertical wavelengths together with the phase shift in the temperature derived from both airglow emissions indicate that these airglow emission layers are separated by 7±3 km, on average.

Calculation of the vibration–rotational transition intensities of water molecules trapped in an argon matrix: stretching O–H vibrations spectral region

ABSTRACTThe frequencies and intensities of vibration–rotational transitions of water molecules in an argon matrix were calculated for temperatures of 6 and 30 K. The rigid asymmetric top approximation was used with available literature values of the effective rotational constants in the ground and excited vibrational states. The calculations were carried out by taking into account the existence of a non-equilibrium population distribution between the rotational levels of ortho- and para-water isomers. It was assumed that the temperature relaxation of the population of rotational levels is independent of the ortho- and para-isomers. Comparison of the results of the theoretical calculations with experimental literature data shows good agreement for the majority of the rotational structure lines for symmetric and antisymmetric stretching vibrations both in the frequency values and in the values of the relative intensities.