scholarly journals The System of Informational Choice of the Kinematic Scheme for the Formation of Shells of a Complex Spatial Form

2019 ◽  
Vol 4 (4) ◽  
pp. 946-956
Author(s):  
V. Mikheev ◽  
A. Grechnikova ◽  
A. Roslyakov ◽  
D. Agafonova
Keyword(s):  
Numerical Experiments ◽  
Shell Thickness ◽  
Statistical Processing ◽  
Complete Information ◽  
Kinematic Scheme ◽  
Spatial Form ◽  
Sheet Blank ◽  
Discrete Values ◽  
Predicted Values ◽  
Free Bending

Three kinematic schemes are studied, which differ from one another in the route of technological operations. Each of these kinematic schemes has its own set of power stages of shaping and stages of free bending or bending of the ends of the sheet blank. In addition, the quantitative values of the angular parameters of a particular kinematic scheme are determined. Numerical experiments have been carried out, which give complete information about the distribution of the shell thickness as discrete values in one or another element. The result is statistical processing of this information, the scope of the predicted values and comparison with the tolerance on the thickness of the peel used in aviation enterprises.

scholarly journals Rotation of floating particles in submesoscale cyclonic and anticyclonic eddies: a model study for the southeastern Baltic Sea

Ocean Science ◽  
2019 ◽  
Vol 15 (6) ◽  
pp. 1691-1705 ◽  
Author(s):  
Victor Zhurbas ◽  
Germo Väli ◽  
Natalia Kuzmina
Keyword(s):  
Baltic Sea ◽  
Numerical Experiments ◽  
Statistical Processing ◽  
Circulation Model ◽  
Initial Distribution ◽  
Horizontal Resolution ◽  
Model Study ◽  
High Horizontal Resolution ◽  
Anticyclonic Eddies ◽  
Floating Particles

Abstract. We hypothesized that the overwhelming dominance of cyclonic spirals on satellite images of the sea surface could be caused by some differences between the rotary characteristics of submesoscale cyclonic and anticyclonic eddies. This hypothesis was tested by means of numerical experiments with synthetic floating Lagrangian particles embedded offline in a regional circulation model of the southeastern Baltic Sea with very high horizontal resolution (0.125 nautical mile grid). The numerical experiments showed that the cyclonic spirals can be formed from both a horizontally uniform initial distribution of floating particles and from the initially lined-up particles during an advection time of the order of 1 d. Statistical processing of the trajectories of the synthetic floating particles allowed us to conclude that the submesoscale cyclonic eddies differ from the anticyclonic eddies in three ways favoring the formation of spirals in the tracer field: they can be characterized by (a) a considerably higher angular velocity, (b) a more pronounced differential rotation and (c) a negative helicity.

scholarly journals Rotation of floating particles in submesoscale cyclonic and anticyclonic eddies: a model study for the southeastern Baltic Sea

2019 ◽  
Author(s):  
Victor Zhurbas ◽  
Germo Väli ◽  
Natalia Kuzmina
Keyword(s):  
Baltic Sea ◽  
Numerical Experiments ◽  
Statistical Processing ◽  
Circulation Model ◽  
Initial Distribution ◽  
Horizontal Resolution ◽  
Model Study ◽  
High Horizontal Resolution ◽  
Anticyclonic Eddies ◽  
Floating Particles

Abstract. It was assumed that the overwhelming dominance of cyclonic spirals on satellite images of the sea surface could be caused by some sort of differences between rotary characteristics of the submesoscale cyclonic and anticyclonic eddies. This hypothesis was tested by means of numerical experiments with synthetic floating Lagrangian particles embedded in a regional circulation model of the southeastern Baltic Sea with very high horizontal resolution (0.125 nautical mile grid). The numerical experiments showed that the cyclonic spirals can be formed both from a horizontally uniform initial distribution of floating particles and from the initially lined up particles during the advection time of the order of 1 day. Statistical processing of the trajectories of the synthetic floating particles allowed to conclude that the submesoscale cyclonic eddies differ from the anticyclonic eddies in three ways favouring the formation of the spirals: the former can be characterized by a considerably higher angular velocity and a more pronounced differential rotation as well as by a negative helicity.

Accounting for measurement errors when harmonising incongruent soil data − a case study

Soil Research ◽  
2018 ◽  
Vol 56 (8) ◽  
pp. 793
Author(s):  
D. M. Crawford ◽  
S. Norng ◽  
M. Kitching ◽  
N. Robinson
Keyword(s):  
Measurement Errors ◽  
Complete Information ◽  
Sufficient Information ◽  
Precision Data ◽  
External Sources ◽  
Alternative Approaches ◽  
Predicted Values ◽  
Different Sources ◽  
Do So

When collating soil data from different sources, the data should be congruent. Ordinary linear regression (OLR) has often been used to harmonise incongruent data. To do so, one of the sources is nominated as the reference and so is assumed to provide data that are determined without error despite evidence to the contrary. Alternative approaches that can handle errors in both variables, such as constructing a maximum likelihood functional relationship (MLFR), are seldom used. Two scenarios compared these two approaches using soil organic carbon data determined by the Walkley and Black method or the Dumas method. An inter-laboratory proficiency program provided data to represent an ideal scenario of complete information on precision, i.e. a mean and standard error of multiple determinations for each method as applied to each soil sample. In this scenario, it was found that the recovery of carbon was not consistent between laboratories or methods, nor was the precision of determinations consistent. Importantly, the precision data showed how neither method had an advantage and so could serve as a reference. Unfortunately, soil researchers are more likely to be trying to harmonise data from single determinations and have no data on the precision of either method. This second scenario was explored using legacy data and new data from re-analysis of 116 archived soil samples, with precision data from different external sources. Here the OLR regression coefficients were found to be much less accurate than those from using the MLFR harmonisation model. We concluded from these scenarios, that MLFR should be used to harmonise incongruent data when data on measurement errors are available. MLFR gave different predicted values to OLR while accounting for measurement errors in both variables. Where sufficient information on precision is lacking, OLR yields similar results and so may be an easier but less rigorous option. However, more research is needed to establish when OLR can be used versus when MLFR should be used.

STRUCTURAL SIMILITUDE AND SCALING LAWS OF ANTI-SYMMETRIC CROSS-PLY LAMINATED CYLINDRICAL SHELLS FOR BUCKLING AND VIBRATION EXPERIMENTS

2007 ◽  
Vol 07 (04) ◽  
pp. 609-627 ◽  
Author(s):  
VARIDDHI UNGBHAKORN ◽  
NUTTAWIT WATTANASAKULPONG
Keyword(s):  
Material Properties ◽  
Physical Modeling ◽  
Numerical Experiments ◽  
Scaling Laws ◽  
Cylindrical Shells ◽  
Buckling Loads ◽  
Closed Form Solutions ◽  
Fundamental Frequencies ◽  
Circular Cylindrical Shells ◽  
Predicted Values

Developed herein are the scaling laws for physical modeling of anti-symmetric cross-ply laminated circular cylindrical shells for buckling and free vibration experiments. In the absence of experimental data, the validity of the scaling laws is verified by numerical experiments. This is accomplished by calculating theoretically the buckling loads and fundamental frequencies of the model and substituting into the scaling laws to obtain the corresponding values of the prototype. The predicted values of the prototype from the scaling laws are then compared with existing closed-form solutions. Examples for the complete similitude cases with various stacking sequences, number of plies, and length-to-radius ratios show exact agreement. The derived relationships between the model and prototype will greatly facilitate and reduce the need for costly experiments. In reality, either due to the complexity of the scaling laws or to economize experimental cost and time, it may not be feasible to construct the model to fulfil the scaling laws completely. Thus, several possible models of partial similitude are investigated numerically. These include models with distortion in laminated material properties, stacking sequences and number of plies. Model with distortion in material properties yields a high percentage of discrepancy and is not recommended.

scholarly journals Choosing an approach to statistical processing of the ship’s pitching record

2021 ◽  
Vol 2131 (5) ◽  
pp. 052052
Author(s):  
V I Sichkarev ◽  
V P Umrikhin ◽  
A Y Koloskov
Keyword(s):  
Statistical Processing ◽  
Half Period ◽  
The Other ◽  
Peak Amplitude ◽  
Time Interval ◽  
The Difference ◽  
Discrete Values ◽  
Essential Reactions ◽  
Initial Peak

Abstract The developed instrumentation and software provides discrete values for the angles of a vessel’s list on an operational voyage in sea conditions at specified time intervals.The half-periods of pitching are considered; the half-period and the corresponding pitching amplitude can be obtained in three different ways: as the amplitude from one board to the other one with the reference of the initial peak-to-peak amplitude or with the reference of the final peak-to-peak amplitude; as the time interval of the ship listing on one side between zero roll angles. It was found that each method corresponds to its own, different from the others, amplitude-period statistics. This makes it difficult to compare different registrations and identify the essential reactions of the vessel to the seaway, unless a method is specified for determining the half-periods and linking the roll amplitudes to them. The proposal is justified to unify the processing by defining the half-period as the time of the ship listing on one board with the corresponding amplitude angle of the roll, that is, as the difference of the moments of time between two next values of the zero angle of the roll.

scholarly journals Ultrasound changes in the thrombosed VSM before and after the influence of endovascular high-frequency electric welding

2018 ◽  
Vol 22 (3) ◽  
pp. 489-493
Author(s):  
S.I. Savoliuk ◽  
V.A. Khodos ◽  
R.A. Herashchenko ◽  
V.S. Horbovets
Keyword(s):  
High Frequency ◽  
Statistical Processing ◽  
Duplex Ultrasound ◽  
Average Diameter ◽  
Complete Information ◽  
Electric Welding ◽  
Vein Segment ◽  
Before And After ◽  
Vein Diameter ◽  
The Moment

During last years, ultrasound duplex angioscanning (USD) gives opportunity to get the most complete information respecting the venous pathology and is used as a method of navigation during conducting of endovascular manipulations. Purpose of research — to study the ultrasound changes in the thrombosed vein before and after the influence of endovascular high-frequency electric welding and to evaluate the effectiveness of the method in the complex surgical service of acute ascending thrombophlebitis of the GSV. During the period from 2015 to 2017 in the surgical departments of the city clinical hospital №8 in Kyiv there were 38 patients with acute ascending thrombophlebitis of the great saphenous vein (AATGSV), who were treated with endovascular electric welding (EVEW). The age ranged from 19 to 78 years (average age 51.28±2.63 years). According to the international classification of CEAR (Clinical Etiological Anatomical Pathophysiological), C2 was noted in 6 (15.8%) patients, C3 — in 13(34.2%), C4 — in 7(18.4%), C5 — in 9(23.7%), C6 — in 3 (7.9%). All patients was treated with ultrasound duplex angiography (USD) using TOSHIBA Nemio XG (Japan), equipped with a convex sensor with an operating frequency of 3.5–5 MHz and a linear sensor with the range of 7.5–12 MHz. Domestically produced electric welder “Swarmed” EK-300М1 were used as a feeding device “Swarmed” EK-300М1. In manual mode, 15 sec. Parametric methods were used for statistical processing of the received results. Average arithmetic meanings (M), standard error of arithmetic mean (m) were calculated. The authenticity of the differences were evaluated using the Student`s criterion. Differences were recognized as statistically significant in p <0,05. Electric welding of the thrombosed vein segment was performed using an endovascular electric welding catheter (EC). With ultrasound examination of the thrombosed vein segment with acute ascending thrombophlebitis of the GSV the average diameter of the vein to effect by EVEW was 9.6±0.4 mm. Multiple hyperechogenicity thrombotic masses were visualized in the vein lumen. On the first day after the EVEW, the diameter of the GSV was increased by 1.3 times and averaged was 12.2±0.4 mm (p<005). The diameter of the vein increased due to the edema of the venous wall after the EVEW. After 1 month, the vein decreased in diameter significantly compared to the previous indicator and its average diameter was 7.4±0.5 mm (p<005), the vein lumen had a hypoechogenic character. After the 3 months period, compared to the 1 month after the EVEW, the vein diameter continued to decrease to 4.7±0.5 mm (p<005). After 6 months from the moment of the EVEW, the diameter of the vein was even more reduced compared to the period of 3 months — 2.4±0.4 mm (p<005). After the period of 1 year or more duplex ultrasound picture showed the completion of the process of obliteration with total vein ablation. In the observation period of 3-6 months, the occurrence of GSV repatency was observed for 3 (7,89%) patients. The ultrasound picture in the thrombosed vein after the endovascular high-frequency electric welding undergoes changes from anechogenic, hypoechogenic to echogenic character, reflects the occlusion process, obliteration and total ablation of the vein.

Influence of stable iodine on the uptake of the thyroid – model vs. experiment

2001 ◽  
Vol 40 (01) ◽  
pp. 31-37 ◽  
Author(s):  
U. Wellner ◽  
E. Voth ◽  
H. Schicha ◽  
K. Weber
Keyword(s):  
Time Course ◽  
Compartment Model ◽  
The Body ◽  
Iodine Uptake ◽  
Model Calculations ◽  
Physiological Conditions ◽  
Iodine Supply ◽  
Predicted Values ◽  
The Individual ◽  
Stable Iodine

Summary Aim: The influence of physiological and pharmacological amounts of iodine on the uptake of radioiodine in the thyroid was examined in a 4-compartment model. This model allows equations to be derived describing the distribution of tracer iodine as a function of time. The aim of the study was to compare the predictions of the model with experimental data. Methods: Five euthyroid persons received stable iodine (200 μg, 10 mg). 1-123-uptake into the thyroid was measured with the Nal (Tl)-detector of a body counter under physiological conditions and after application of each dose of additional iodine. Actual measurements and predicted values were compared, taking into account the individual iodine supply as estimated from the thyroid uptake under physiological conditions and data from the literature. Results: Thyroid iodine uptake decreased from 80% under physiological conditions to 50% in individuals with very low iodine supply (15 μg/d) (n = 2). The uptake calculated from the model was 36%. Iodine uptake into the thyroid did not decrease in individuals with typical iodine supply, i.e. for Cologne 65-85 μg/d (n = 3). After application of 10 mg of stable iodine, uptake into the thyroid decreased in all individuals to about 5%, in accordance with the model calculations. Conclusion: Comparison of theoretical predictions with the measured values demonstrated that the model tested is well suited for describing the time course of iodine distribution and uptake within the body. It can now be used to study aspects of iodine metabolism relevant to the pharmacological administration of iodine which cannot be investigated experimentally in humans for ethical and technical reasons.

MS2/Cardio: Towards a Multi-Service Medical Software for Cardiology

1992 ◽  
Vol 31 (01) ◽  
pp. 18-28 ◽  
Author(s):  
C. Combi ◽  
G. Pozzi ◽  
R. Rossi ◽  
F. Pinciroli
Keyword(s):  
Statistical Processing ◽  
Clinical Information ◽  
Daily Practice ◽  
Management Unit ◽  
Record Management ◽  
Medical Software ◽  
Software Packages ◽  
Ambulatory Patients ◽  
Patient Database ◽  
Individual Program

Abstract:Many clinics are interested to use software packages in daily practice, but lack of integration of such packages seriously limits their scope. In practice this often entails switching between programs and interrupting the run of an individual program. A multi-task approach would not solve this problem as it would not eliminate the need to input the same data many times, as often occurs when using separate packages. The construction of a Multi-Service Medical Software package (MSx2) is described, which was also developed as an example of practical integration of some clinically relevant functions. The package runs on a personal computer in an MS-DOS environment and integrates a time-oriented medical record management unit (TOMRU) for data of ambulatory patients, and a drug information management unit (DIMU) concerning posology, content, effects, and possible interactions. Of the possible database configurations allowed by MSx2, the cardiology patient database (MSx2/C) and hypertensive patient database (MSx2/H) were developed and described here. Clinical information to be included in the configurations was obtained after discussion and consensus of clinical practitioners. MSx2/C was distributed to several hundred clinical centers during computerized courses to train future users. MSx2 can easily transfer patient data to statistical processing packages.

Hubungan Antara Anemia dan Kebiasaan Merokok pada Ibu Hamil dengan Kejadian BBLR di Rumah Sakit Umum Pusat Dr. Mohammad Hoesin Palembang Tahun 2016

2018 ◽  
Vol 1 (2) ◽  
pp. 89-94
Author(s):  
Intan Sari
Keyword(s):  
Birth Weight ◽  
Low Birth Weight ◽  
General Hospital ◽  
Smoking Habit ◽  
Complete Information ◽  
Developed Countries ◽  
Statistical Test ◽  
Survey Method ◽  
Bivariate Analysis ◽  
Cross Sectional

Low Birth Weight (LBW) is an infant born with a birth weight of less than 2500 grams regardless of gestation. Birth weight is the weight of the baby weighed in 1 hour after birth. (Depkes RI, 2009). Based on WHO and UNICEF data, in 2013 about 222 million babies were born in the world, of which 16% were born with low birth weight. The percentage of LBW in developing countries is 16.5% twice that of developed countries (7%) (Scholar Unand, 2014). The purpose of this study was to determine whether there is a relationship between anemia and Smoking Habit in Pregnant Women with LBW occurrence in General Hospital Dr. Mohammad Hoesin Palembang Year 2016. This research use analytical survey method with cross sectional approach. The population in this study were all mothers who gave birth monthly in Midwifery Installation of Dr. General Hospital Mohammad Hoesin Palembang in 2016 as many as 315 respondents. The sample of this research is some of mothers who give birth enough month in Midwifery Installation of Dr. General Hospital Mohammad Hoesin Palembang Year 2016 as many as 315 respondents. ". From the results of bivariate analysis of anemic respondents with the occurrence of LBW obtained statistical test X2 count = 23.22 which means there is a significant relationship between anemia with the incidence of BBLR. Respondents smoking with the occurrence of LBWR obtained statistical test X2 count = 41.20 which means there is a relationship Meaningful between smoking and LBW incidence. From the results of this study is expected that this research can be a reference material and is a complete information and useful for the development of knowledge about LBW.

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