Wyniki wyszukiwania - Biblioteka Nauki

1

Model tests on characteristic of suction caissons in saturated fine sand under intermittent loading

100%

Shi P.

Polish Maritime Research

|

2018

|

tom 25

|

nr Special Issue S3

EN

Suction caissons are often used for the caissons of both offshore oil platforms and offshore wind power projects because of their advantages of simple construction, economical cost, and reusability. In this study, model tests were conducted in sand in order to investigate the effects of the caisson installation method on the penetration depth and the critical suction. Results of the test program showed that the method of changing the frequency of suction during different stages of the process can increase the penetration depth of the caisson. Combining with the deformation of the soil body inside and outside the caisson, the existing method for calculating the critical suction is modified, and the critical suction calculation equation of the discontinuous penetration test is proposed. Based on the test results, the calculation equation of the soil heave height can be more accurate predicted . The analysis results ver if y that the calculation method and the actual results are in good agreement

2

Model tests on characteristic of suction caissons in saturated fine sand under intermittent loading

100%

Shi P.

Polish Maritime Research

|

2018

|

tom S 3

127--135

EN

Suction caissons are often used for the caissons of both offshore oil platforms and offshore wind power projects because of their advantages of simple construction, economical cost, and reusability. In this study, model tests were conducted in sand in order to investigate the effects of the caisson installation method on the penetration depth and the critical suction. Results of the test program showed that the method of changing the frequency of suction during different stages of the process can increase the penetration depth of the caisson. Combining with the deformation of the soil body inside and outside the caisson, the existing method for calculating the critical suction is modified, and the critical suction calculation equation of the discontinuous penetration test is proposed. Based on the test results, the calculation equation of the soil heave height can be more accurate predicted. The analysis results verify that the calculation method and the actual results are in good agreement.

3

Nonlinear actuator fault estimation observer: an inverse system approach via a T-S fuzzy model

51%

Xu D. , Jiang B. , Shi P.

International Journal of Applied Mathematics and Computer Science

|

2012

|

tom Vol. 22, no. 1

183-196

EN

Based on a Takagi-Sugeno (T-S) fuzzy model and an inverse system method, this paper deals with the problem of actuator fault estimation for a class of nonlinear dynamic systems. Two different estimation strategies are developed. Firstly, T-S fuzzy models are used to describe nonlinear dynamic systems with an actuator fault. Then, a robust sliding mode observer is designed based on a T-S fuzzy model, and an inverse system method is used to estimate the actuator fault. Next, the second fault estimation strategy is developed. Compared with some existing techniques, such as adaptive and sliding mode methods, the one presented in this paper is easier to be implemented in practice. Finally, two numerical examples are given to demonstrate the efficiency of the proposed techniques.

4

Spatial temporal analysis of land use change in the Shiyang River Basin in arid China, 1986-2015

45%

Wei W. , Xie Y. , Shi P. , Zhou J. , Li C.

Polish Journal of Environmental Studies

|

2017

|

tom 26

|

nr 4

EN

The Shiyang River Basin has been regarded as an important ecological protective area in the Hexi corridor in northwest China. Landsat TM, ETM+, and OLI images in 1986, 2000, 2006, and 2015 were selected as basic data resources, and the circle layers and fan-shaped analysis were applied to extract change information and the characteristics of land use pattern change by a set of transfer and dynamic models. Results showed that urban and residential land expanded 176.7 km², which was about 48.57% in the past 30 years, and that the woodland and grassland decreased 7.24% and 1.39%, respectively. It was found that woodland mainly distributed in the range of elevation from 2,500 to 4,000 m, and unused land was distributed in the downstream plain, which was an average elevation of 1,500 meters below. Moreover, the area and spatial distribution of land use were influenced by human activities and resulted in fundamental changes of pattern. We found that spatiotemporal pattern analysis of land use cover was essential for understanding the structure and characteristics of urbanization and the local eco-environment.

5

Simultaneous analysis of adenosine triphosphate and its metabolites in Saccharomyces Cerevisiae using RP-HPLC

45%

Zhu P. , Wang S. , Wang J. , Zhou L. , Shi P.

Acta Chromatographica

|

2016

|

tom Vol. 28, no. 4

501--511

EN

In order to assess the contribution of adenosine triphosphate and its metabolites to the cellular metabolism process in Saccharomyces cerevisiae, it is very important to simultaneously determine the relative concentrations of ATP and its metabolites. In this study, a fast, simple reversed-phase high-performance liquid chromatography with high selectivity was developed to simultaneously measure adenosine triphosphate and its metabolites (adenosine diphosphate, adenosine monophosphate, and cyclic adenosine monophosphate) in yeast. The method was performed under the gradient grogram, and the detection was monitored at 254 nm. Analysis was achieved within 25 min. The four components can be detected with linear response over the concentration range from 1 to 100 mg L−1 with excellent correlation coefficients (r2) > 0.999. The recovery of the four analytes was 92.9%, 90.4%, 99.1%, and 105.1%, respectively. To demonstrate the good analysis of yeast samples, changes in the four adenine nucleotides levels caused by caloric restriction in yeast were determined. It is expected that the current method may contribute to further metabolomics and system biology investigations of yeast.

6

Characterization and imprinting analysis of COPG2 and MEST genes in pigs

38%

Jiang C. , Li S. , Shi P. , Dong R. , Tian J. , Deng C.

Animal Science Papers and Reports

|

2011

|

tom 29

|

nr 3

EN

MEST and COPG2 in human MEST imprinted cluster are two of good candidate genes responsible for primordial growth retardation including Silver–Russell syndrome. In order to increase understanding of these genes in pigs, their cDNAs are characterized in this report. By real-time quantitative RT-PCR and polymorphism-based method, tissue and allelic expression of both genes were determined using F1 reciprocal Landrace × Rongchang pig crossbreds. The transcription levels of MEST differed between tissues and decreased as development proceeded. The gene was imprinted and paternally expressed in heart, stomach, skeletal muscle, kidney, lung, bladder,tongue and fat, while biallelic expression was detected in liver, small intestine and spleen of onemonth-old pigs. The porcine COPG2 was differentially expressed between neonatal tissues and showed biallelic expression in postnatal tissues. Furthermore, the transcript of COPG2 in bladder and small intestine increased with age. It is concluded that tissue expression of porcine MEST is similar to, while COPG2 differs from other mammalian homologues. In addition, porcine MEST has development-specific imprinting, but imprinting of COPG2 in mammals is controversial.