A comparative study of along and cross-wind responses of a tall chimney with and without flexibility of soil

Gorski, Piotr,Chmielewski, Tadeusz Techno-Press 2008 Wind and Structures, An International Journal (WAS Vol.11 No.2

The paper is concerned with a comparative study of both the along and cross-wind responses of a tall industrial chimney with and without flexibility of soil. The along-wind response has been estimated by means of approaches presented in three Standards: the Polish, the ISO and the Eurocode and by random vibration approach which is outlined below. The cross-wind response has been estimated by means of the three models developed by Vickery and Basu, Ruscheweyh and Flaga and methods presented in Standards: the Polish, the ISO and the Eurocode (Approach 1 and 2). Computer programmes were developed to obtain estimates of responses of a six-flue, 250 m-tall chimney. The analytical results computed according to the methods presented in different standards and random vibration approaches have been compared. Some unexpected conclusions have been observed.

Strouhal number of bridge cables with ice accretion at low flow turbulence

Gorski, Piotr,Pospisil, Stanislav,Kuznetsov, Sergej,Tatara, Marcin,Marusic, Ante Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.22 No.2

The paper concerns with the method and results of wind tunnel investigations of the Strouhal number (St) of a stationary iced cable model of cable-supported bridges with respect to different angles of wind attack. The investigations were conducted in the Climatic Wind Tunnel Laboratory of the Czech Academy of Sciences in $Tel{\check{c}}$. The methodology leading to the experimental icing of the inclined cable model was prepared in a climatic section of the laboratory. The shape of the ice on the cable was registered by a photogrammetry method. A section of an iced cable model with a smaller scale was reproduced with a 3D printing procedure for subsequent aerodynamic investigations. The St values were determined within the range of the Reynolds number (Re) between $2.4{\cdot}10^4$ and $16.5{\cdot}10^4$, based on the dominant vortex shedding frequencies measured in the wake of the model. The model was oriented at three principal angles of wind attack for each of selected Re values. The flow regimes were distinguished for each model configuration. In order to recognize the tunnel blockage effect the St of a circular smooth cylinder was also tested. Good agreement with the reported values in the subcritical Re range of a circular cylinder was obtained. The knowledge of the flow regimes of the airflow around an iced cable and the associated St values could constitute a basis to formulate a mathematical description of the vortex-induced force acting on the iced cable of a cable-supported bridge and could allow predicting the cable response due to the vortex excitation phenomenon.

Some aspects of the dynamic cross-wind response of tall industrial chimney

Gorski, Piotr Techno-Press 2009 Wind and Structures, An International Journal (WAS Vol.12 No.3

The paper is concerned with the numerical study of the cross-wind response of the 295 m-tall six-flue industrial chimney, located in the power station of Belchatow, Poland. The response of the chimney due to turbulent wind flow is caused by the lateral turbulence component and vortex excitation with taking into account motion-induced wind forces. The cross-wind response has been estimated by means of the random vibration approach. Three power spectral density functions suggested by Kaimal, Tieleman and Solari for the evaluation of the lateral turbulence component response are taken into account. The vortex excitation response has been calculated by means of the Vickery and Basu's model including some complements. Motion-induced wind forces acting on a vibrating chimney have been modeled as a nonlinear aerodynamic damping force. The influence of three components mentioned above on the total cross-wind response of the chimney has been investigated. Moreover, the influence of damping ratios, evaluated by Multi-mode Random Decrement Technique, and number of mode shapes of the chimney have been examined. Computer programmes have been developed to obtain responses of the chimney. The numerical results and their comparison are presented.

Role of SIRT1 in Modulating Acetylation of the Sarco-Endoplasmic Reticulum Ca ²⁺ -ATPase in Heart Failure

Gorski, Przemek A.,Jang, Seung Pil,Jeong, Dongtak,Lee, Ahyoung,Lee, Philyoung,Oh, Jae Gyun,Chepurko, Vadim,Yang, Dong Kwon,Kwak, Tae Hwan,Eom, Soo Hyun,Park, Zee-Yong,Yoo, Yung Joon,Kim, Do Han,Kook, Grune & Stratton 2019 Circulation research Vol.124 No.9

Strouhal number of bridge cables with ice accretion at low flow turbulence

Piotr Gorski,Stanislav Pospisil,Sergej Kuznetsov,Marcin Tatara,Ante Marusic 한국풍공학회 2016 Wind and Structures, An International Journal (WAS Vol.22 No.2

The paper concerns with the method and results of wind tunnel investigations of the Strouhal number (St) of a stationary iced cable model of cable-supported bridges with respect to different angles of wind attack. The investigations were conducted in the Climatic Wind Tunnel Laboratory of the Czech Academy of Sciences in Telč. The methodology leading to the experimental icing of the inclined cable model was prepared in a climatic section of the laboratory. The shape of the ice on the cable was registered by a photogrammetry method. A section of an iced cable model with a smaller scale was reproduced with a 3D printing procedure for subsequent aerodynamic investigations. The St values were determined within the range of the Reynolds number (Re) between 2.4•104 and 16.5•104, based on the dominant vortex shedding frequencies measured in the wake of the model. The model was oriented at three principal angles of wind attack for each of selected Re values. The flow regimes were distinguished for each model configuration. In order to recognize the tunnel blockage effect the St of a circular smooth cylinder was also tested. Good agreement with the reported values in the subcritical Re range of a circular cylinder was obtained. The knowledge of the flow regimes of the airflow around an iced cable and the associated St values could constitute a basis to formulate a mathematical description of the vortex-induced force acting on the iced cable of a cable-supported bridge and could allow predicting the cable response due to the vortex excitation phenomenon.

Lornoxicam Antimediator Therapy Influence on TLR2, TLR4 mRNA Expression at Patients with Systemic Complications of Severe Acute Pancreatitis

( V. A. Gorsky ),( M. V. Horeva ),( A. V. Protasov ),( A. L. Kulakova ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: The pathogenic mechanism of severe acute pancreatitis is the appearance of damage associated molecular patterns in the extracellular space which effect through the Toll-like receptors (TLRs) and cause the positioning of the latter as new targets for therapeutic influence. The aim of this study is to examine the TLR2 and TLR4 mRNA expression level (EL) in mononuclear cells in peripheral blood of patients and to analyse the effect of lornoxicam therapy. Methods: 72 patients with systemic complications of severe acute pancreatitis were divided into two groups. 57% (n= 41) received only standard conservative therapy (1st group). 43% (n= 31) had additional lornoxicam antimediator therapy (2nd group). Blood samples were taken on 1,3,7,12 day. Results: Death rate was 19.1% (n=9) (1st group), 6.5% (n=2) (2nd group) (P=0.006). The TLR2 EL in both groups on the 1st day was higher than at healthy donors (P=0.00031). The 1st group had increased TLR2 EL on the 3rd, 7th and 12 day. The 2nd group had no increase of TLR2 EL on the 3rd day and on the 7th,12 day gradual decrease of TLR2 EL was observed. TLR2 EL was significantly lower in the 2nd group than in the 1st group on the 7th (P=0.007), 12 day (P=0.013). The TLR4 EL in both groups was significantly increased. Conclusions: Lornoxicam reduces TLR2 and TLR4 EL in peripheral blood of patients which allowed to achieve significant statistically reduction of patients mortality.

Monitoring of tall slender structures by GPS measurements

Chmielewski, Tadeusz,Breuer, Peter,Gorski, Piotr,Konopka, Eduard Techno-Press 2009 Wind and Structures, An International Journal (WAS Vol.12 No.5

A method is applied for the estimation of structural damage of tall slender structures using natural frequency and displacements measurements by GPS. The relationship between the variation in the global stiffness matrix (or in the stiffness of each finite element) and the change in the natural frequencies of the structure is given. In engineering practice the number of frequencies which can be derived by GPS measurement of long-period structures will be equal to one, two or three first natural frequencies. This allows us in initial studies to detect damage with frequency changes based on forward methods in which the measured frequencies are compared with the predicted analytical data. This idea, of health monitoring from possible changes to natural frequencies, or from a statement of excessive displacements is applied to the Stuttgart TV Tower.

인체 17 부위 피부 온감 역치에서 피부 가온 속도의 영향

정다희,조가영,Andrew Gorski,이주영 한국생활환경학회 2023 한국생활환경학회지 Vol.30 No.1

The purpose of this study was to investigate the effects of heating rate on cutaneous warm thresholds in thermoneutral environments. Fifteen young males participated in this study and their cutaneous thermal thresholds for warmth were measured on 17 body regions using a thermal stimulator at the following three speed conditions: 0.1oC/s, 0.3oC/s, and 0.5oC/s. Subjects pressed the button-switch once they felt ‘warmth’ at first from their neutral-adapting thermal state. The results showed that: (1) among the 17 body regions, only sole temperature at warmth had a significant difference among the three heating rate conditions (31.5 ± 2.0, 32.2 ± 1.4, and 30.8 ± 2.1oC at 0.1oC/s, 0.3oC/s, and 0.5oC/s, respectively; P < 0.05). (2) Noticeable increases in skin temperature to detect the warmth showed significant differences among the three heating rates on the 11 body regions, including the sole (4.0 ± 2.3oC, 4.1 ± 2.4oC, and 5.8 ± 3.2oC at 0.1oC/s, 0.3oC/s, and 0.5oC/s, respectively; P < 0.05), which had increased most rate among the 17 body regions as well (P < 0.01). (3) There were significant differences in the warmth thresholds on the 17 body regions at all the three heating rate conditions. The lower back was the most sensitive to detect warmth while the back calf was the least sensitive (P < 0.05). In summary, the differences between a heating speed of 0.1 and 0.3oC/s did not result in differences in cutaneous warmth thresholds (for the 17 body regions). However, the difference between a heating rate of 0.3 and 0.5oC/s could affect the thermal sensitivity on certain peripheral body regions. These results suggest that differences in heating rate, between 0.1 and 0.5oC/s, had negligible effects on for skin temperature, itself, for the most body regions (except the sole at the 0.5oC/s heating), but increases in skin temperature was affected by the rate of heating speed. Body regional differences, however, rather than heating rate, were more salient features in cutaneous warm sensitivity.

여름철 도시 거주 성인의 열스트레스 인지 및체온조절성 행동에서의 성차

주희영,김규랑,Andrew Gorski,이주영 한국지역사회생활과학회 2022 한국지역사회생활과학회지 Vol.33 No.4

We investigated the sex-related differences in thermoregulatory behavior and heat-stress cognition of adults during a hot and humid summer. A total of 2,653 adults (1,341 males and 1,312 females), who resided in Seoul and Busan, participated in our online surveys from late June to August 2021. Web-bulb globe temperatures (WBGT) were monitored in Seoul and Busan at the same time as the online surveys. Data from the survey and the WBGT values were paired for analysis. The results showed that the WBGT in summer was 24.6 ± 2.4 o C. Thermal comfort, the WBGT level when feeling hot in summer, self-identified heat tolerance, threshold temperature of hot weather perceived (30.1 o C), activities (2 Met), and clothing insulation (0.4 clo) showed no sex differences. However, significant sex-related differences were found in the following : females perceived themselves as being more vulnerable to cold, sweating less, having a higher threshold temperature for cold weather, preferring higher indoor temperature, catching colds in summer and winter, using more extra clothes, using fans less during sleep, and taking fewer cold showers during summer than males (all Ps < 0.05). These results indicated that the sex-related differences during summer could be associated with differences in cold perception or cold tolerance, rather than heat perception or heat tolerance because most sex-related differences were found in the items related to environments with indoor cooling during summer.

Amperometric Determination of Glucose at Conventional vs. Nanostructured Gold Electrodes in Neutral Solutions

Wooten, Marilyn,Shim, Jun Ho,Gorski, Waldemar WILEY-VCH Verlag 2010 Electroanalysis Vol.22 No.12

<P>The conventional gold electrodes were compared with recently published electrodes based on gold nanoparticles and gold nanostructured films as amperometric sensors for glucose in pH 7.40 phosphate buffer solutions. The conventional electrodes provided similar electroanalytical benefits while required much simpler and shorter preparation. It is recommended that the future reports on the development of electrochemical sensors based on metal nanoparticles/nanostructures include also the analytical figures of merit obtained at relevant conventional metal electrodes. The voltammetric studies indicated that, in contrast to phosphate buffers, the Tris buffers were not suitable for activation of gold surface toward the direct oxidation of glucose.</P>