Готові списки джерел за темами / DSTCs

Добірка наукової літератури з теми "DSTCs"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "DSTCs"

1

Ozbakkloglu, Togay, and Butje Alfonsius Louk Fanggi. "An Experimental Study on Behavior of FRP-HSC-Steel Double-Skin Tubular Columns under Concentric Compression." Applied Mechanics and Materials 357-360 (August 2013): 565–69. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.565.

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Анотація:
This paper reports on part of an ongoing experimental program at The University of Adelaide on FRP-concrete-steel composite columns. The results from eight FRP-concrete-steel double-skin columns (DSTCs) that were tested under constant axial compression are presented. The key parameters examined included diameter, thickness, and strength of inner steel tube. The results of the experimental study indicate that concrete in a DSTC system is confined effectively by FRP and steel tubes. The results also indicate that increasing the inner steel tube diameter leads to an increase in the ultimate axial strength and strain of DSTCs. No clear influence of the strength of inner steel tube is observed on the ultimate condition of concrete in DSTCs. These results are presented together with a discussion on the influence of the key parameters on the compressive behavior of DSTCs.
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2

Zhang, Bing, Xia-Min Hu, Wei Wei, Qian-Biao Zhang, Ning-Yuan Zhang, and Yi-Jie Zhang. "Effect of Cross-Sectional Aspect Ratio on Rectangular FRP-Concrete-Steel Double-Skin Tubular Columns under Axial Compression." Advances in Polymer Technology 2020 (May 27, 2020): 1–15. http://dx.doi.org/10.1155/2020/1349034.

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Анотація:
Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are novel hollow columns consisting of an outer FRP tube, an inner steel tube, and the concrete between the two tubes. Hybrid DSTCs possess important advantages, such as excellent corrosion resistance as well as remarkable seismic resistance. However, existing studies are mainly focused on hybrid DSTCs with a circular cross section or a square cross section. When a column is subjected to different load levels in the two horizontal directions, a rectangular column is preferred as it can provide different bending stiffness and moment capacity around its two axes of symmetry. This paper presents an experimental study on rectangular DSTCs with a particular focus on the effect of the cross-sectional aspect ratio (i.e., the ratio of the breadth to the width of the rectangular cross section). The effect of the cross-sectional shape of the inner steel tube (i.e., both elliptical and rectangular inner steel tubes were used) and the effect of FRP tube thickness were also investigated experimentally. Experimental results show that a larger aspect ratio will have no negative effect on the confinement effect in rectangular DSTCs; a rectangular DSTC with a larger aspect ratio generally has a larger ultimate axial strain and a higher axial stress at the ultimate axial strain; rectangular DSTCs with an elliptical steel tube generally have better performance than corresponding specimens with a rectangular steel tube. An existing model, which was developed based on a model for rectangular FRP-confined concrete columns and a model for circular DSTCs, is verified using the test results of the present study. The model generally provides close predictions for the peak axial stress of the confined concrete but yields conservative predictions for the ultimate axial strain for rectangular DSTCs.
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3

Youssf, Osama, Reza Hassanli, Julie E. Mills, and Yan Zhuge. "Axial Compression Behaviour of Hybrid Double-Skin Tubular Columns Filled with Rubcrete." Journal of Composites Science 3, no. 2 (June 19, 2019): 62. http://dx.doi.org/10.3390/jcs3020062.

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Анотація:
Double-skin tubular columns (DSTCs) have become a competitive candidate for column members due to their important advantages compared with conventional reinforced concrete columns, including their better weight-to-strength ratio and ease of construction. Using Rubcrete in hybrid DSTCs is of great interest due to the potential of this system to overcome the Rubcrete material deficiencies and to add more ductility, toughness, seismic resistance, confinement effectiveness, and environmentally-friendly features to that structural system compared to conventional concrete. In this paper, hybrid DSTCs made out of Rubcrete, sandwiched between a fibre reinforced polymer (FRP) tube and a steel tube, were tested. The examined variables were concrete sand or stone replacement ratio (0% and 20%), FRP wall thickness (1- and 2-layers), steel wall thickness (3.2 mm and 4.5 mm), void ratio (50% and 76%), and void shape (circular or square). The axial and lateral stress–strain responses were monitored, measured, and compared. According to this investigation, using Rubcrete in hybrid DSTCs can enhance the axial and hoop strain capacities, especially with fine rubber particles. It was also observed that the adverse influence of using rubber on column ultimate capacity was much lower in DSTC specimens, compared with that of unconfined Rubcrete columns. Therefore, using Rubcrete with fine rubber particles is recommended in DSTC structural columns.
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4

Louk Fanggi, Butje Alfonsius, and Togay Ozbakkaloglu. "Relative Performance of FRP-Concrete-Steel Double Skin Tubular Columns versus Solid and Hollow Concrete-Filled FRP Tubes." Applied Mechanics and Materials 501-504 (January 2014): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.3.

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Анотація:
This paper reports on part of an ongoing experimental program at the University of Adelaide on FRP-concrete-steel composite columns. The results from twenty specimens including 12 double skin tubular columns (DSTCs), two solid concrete-filled fiber reinforced polymer (FRP) tubes (CFFTs), and six CFFTs with inner voids (H-CFFTs) are presented. The specimens were manufactured using high-strength concrete (HSC) and their FRP tubes were fabricated using unidirectional S-glass fiber sheets. The results of the experimental study indicate that that H-CFFTs perform significantly worse than DSTCs and CFFTs and their performance further degrades with an increase in the diameter of inner void. Comparison of the results from DSTC and CFFT specimens indicate that both hollow and concrete-filled DSTCs exhibit improved compressive behavior compared to CFFTs.
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5

Louk Fanggi, Butje Alfonsius, and Togay Ozbakkaloglu. "Influence of Concrete-Filling Inner Steel Tube on Compressive Behavior of Double-Skin Tubular Columns." Advanced Materials Research 838-841 (November 2013): 535–39. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.535.

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Анотація:
This paper reports on a part of an ongoing experimental program at the University of Adelaide on the behavior of fiber reinforced polymer (FRP)-concrete-steel double-skin tubular columns (DSTCs). Influence of concrete-filling inner steel tube on the compressive behavior of FRP-concrete-steel DSTCs was investigated experimentally through the test of 8 normal-and high-strength concrete DSTCs. The results of the experimental study indicate that concrete-filling inner steel tubes of DSTCs results in a slightly increase in the compressive strength and decrease in the ultimate strain of concrete in DSTCs, compared to companion DSTCs with hollow inner steel tubes. The results also indicate that concrete in both types of DSTCs is confined effectively by FRP and steel tubes.
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6

Louk Fanggi, Butje Alfonsius, and Togay Ozbakkaloglu. "Effect of Loading Pattern on Performance of FRP-HSC-Steel Double Skin Tubular Columns." Advanced Materials Research 919-921 (April 2014): 83–87. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.83.

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Анотація:
This paper reports on part of an ongoing experimental program at the University of Adelaide on FRP-concrete-steel double-skin tubular columns (DSTCs). The main emphasis of the study reported in this paper was to investigate the influence of loading pattern on the axial compressive behavior of DSTCs. To this end, 12 hollow and concrete-filled DSTCs were manufactured and tested under monotonic or cyclic axial compression. All of the specimens were manufactured using high-strength concrete (HSC). The results of the experimental study indicate that that concrete in cyclically loaded hollow DSTCs exhibits slightly larger strength and strain enhancement ratios than concrete in companion monotonically loaded DSTCs. The results also indicate that concrete in filled DSTCs exhibit slightly larger strength enhancement ratios than and similar strain enhancement ratios to concrete in monotonically loaded DSTCs.
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7

Li, Xue, Lian-guang Wang, Hai-yang Gao, and Ni Zhang. "Experimental investigation on behavior of splicing glass fiber–reinforced polymer-concrete–steel double-skin tubular columns under axial compression." Advances in Structural Engineering 25, no. 6 (January 14, 2022): 1357–68. http://dx.doi.org/10.1177/13694332211060643.

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Анотація:
Splicing glass fiber–reinforced polymer (GFRP)-concrete–steel double-skin tubular column (DSTC) is to set connection component at the joint of two or more separated GFRP tubes, and then pour concrete in the double-tube interlayer to form a continuous composite member. In this paper, the splicing DSTC composite members based on steel bar connection were designed and tested under axial compression to determine its mechanical performance. The main parameters include the connection steel ratio, the hollow ratio, and the thickness of GFRP tube. The results show that the GFRP tube presents apparent constraint effect on the concrete at about 60% of the ultimate load. The failure of splicing specimen occurred in the non-splicing section at a certain distance from the splice joint, and the stirrups at the splice joint provide effective constraint effect on the internal concrete. The proposed DSTC splicing method based on steel cage connection can satisfy the strength requirements of splice joint. Nevertheless, the increase of axial steel bar ratio cannot improve the bearing capacity of the splicing column, and the steel ratio of 2.44% is suggested for the splice joint of DSTCs under axial compression. The axial bearing capacity of splicing DSTCs significantly increases with the increase of GFRP tube thickness, but the amount of stirrups should be increased properly when a larger tube thickness is used. Two models were selected to calculate the bearing capacity of splicing members and it is found that Yu’s model is more accurate in predicting splicing DSTCs.
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8

Louk Fanggi, Butje Alfonsius, and Togay Ozbakkloglu. "Effect of Inner Steel Tube Cross-Sectional Shape on Compressive Behavior of Square FRP-Concrete-Steel Double-Skin Tubular Columns." Applied Mechanics and Materials 752-753 (April 2015): 578–83. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.578.

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Анотація:
Recently, a new type of composite system was proposed in the form of fibre reinforced polymer (FRP)-concrete-steel double-skin tubular columns (DSTCs). The performance of this column system, which consists of an outer tube made of FRP and an inner tube made of steel, has been experimentally investigated in a number of studies. However, apart from a single study reported on square DSTCs, all of the existing studies have been concerned with DSTCs with circular external tubes. This paper reports on part of an ongoing experimental program at the University of Adelaide that was aimed at addressing this research gap. The effect of cross-sectional shape of inner steel tube on compressive behaviour of square DSTCs was investigated through the test of 16 hollow and concrete-filled DSTCs. The result of the experimental study indicate that concrete in hollow DSTCs with circular inner steel tubes develop significantly larger ultimate axial stresses and strains than concrete in companion hollow DSTCs with square inner steel tubes. On the other hand, the results also indicate that the presence of a concrete-filling inside inner steel tubes results in a significant improvement in the behavior of DSTCs with square inner steel tubes.
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9

Louk Fanggi, Butje Alfonsius, and Togay Ozbakkloglu. "Influence of Inner Steel Tube Diameter on Compressive Behavior of Square FRP-HSC-Steel Double-Skin Tubular Columns." Advanced Materials Research 1119 (July 2015): 688–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.688.

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Анотація:
FRP-concrete-steel double-skin tubular columns (DSTCs) are a new form composite column system that effectively combines the advantages of the constituent materials. The performance of this column system has been experimentally investigated in a number of recent studies. However, apart from a single study reported on square DSTCs, all of the existing studies have been concerned with DSTCs with circular external tubes. This paper reports on part of an ongoing experimental program at the University of Adelaide on FRP-concrete-steel composite columns. The results from 12 square hollow and concrete-filled DSTCs and six companion hollow concrete-filled FRP tubes (H-CFFTs) that were tested under axial compression are presented. Results of the experimental study indicate that hollow DSTCs with larger inner steel tube diameters develop similar ultimate axial stresses to but significantly larger axial strains than companion DSTCs with smaller inner steel tubes. The results also show that, in concrete-filled DSTCs with similar Ds/ts ratios, an increase in the steel tube diameter leads to an increase in both axial stress and strain of concrete. It was observed that H-CFFTs perform significantly worse than both hollow and filled DSTCs under axial compression, and their behavior further degrades with an increase in the diameter of their inner voids.
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10

Fanggi, Butje Alfonsius Louk, and Togay Ozbakkaloglu. "Influence of Inner Steel Tube Properties on Compressive Behavior of FRP-HSC-Steel Double-Skin Tubular Columns." Applied Mechanics and Materials 438-439 (October 2013): 701–5. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.701.

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Анотація:
This paper reports on part of an ongoing experimental program at The University of Adelaide on FRP-concrete-steel composite columns. A total of eight high-strength concrete double-skin tubular columns (DSTCs) were tested under axial compression. The column parameters examined included the diameter, thickness, and shape of inner steel tube. The results of the experimental study show that increasing the inner steel tube diameter leads to an increase in the ultimate axial stress and strain of concrete in DSTCs. The results also show that increasing inner steel tube thickness leads to an increase in the ultimate axial stress and strain of DSTCs. Furthermore, it is observed that concrete inside DSTCs with square inner steel tubes is not confined as effectively as concrete inside DSTCs with circular inner steel tubes.
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Більше джерел

Дисертації з теми "DSTCs"

1

Lin, Chunyu. "Studies on the Porphyrin and Phthalocyanine Modified on Sno2 Photoelectrochemical Cells." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc407761/.

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The world is facing a tough challenge regarding fulfilling human energy needs. Scientists are motivated to find alternative ways to the fossil fuel at a lower cost with little or no environmental pollution. Among the available renewable resources, the solar energy is an alternative energy to fossil fuel. Scientists are engaged in mimicking the photosynthesis to create the new energy devices such as dye sensitized solar cells. The fundamental theory and properties of the dye sensitized solar cells is given in the first chapter. In this research, the application of the different methods for surface alteration of SnO2 with water soluble porphyrins and phthalocyanine is studied. Using optical absorbance and steady state fluorescence studies, the formation of porphyrins and phthalocyanine discuss on the SnO2 surface is shown. Moreover, the different results of photoelectrochemical cells are show on chapter 2 to understand the porphyrin and phthalocyanine modified on SnO2 as electron injector. In summary, the application porphyrin and phthalocyanine of dimers as a broad band capturing photosensitized dye is discussed.
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2

Lima, Michael Augusto Souza de. "Vulnerabilidade e prevenção às DST’s nas práticas afetivo-sexuais de lésbicas." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8184.

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Introduction: The present study had as general objective to analyze the vulnerability and preventive practices against sexually transmitted diseases (STDs) affective-sexual relations. Methods: this was an exploratory study and descriptive, transversal and qualitative character. The sample was composed of 18 participants defined lesbian women, with ages ranging from 19 to 42 years (M = 26; DP = 6.1). For the collection of data was used a demographic questionnaire and semi-structured interviews. The collection came from a participant matrix and followed the selection of new participants by the method of "snowball". The data from the demographic questionnaire were analyzed through descriptive statistics in PASW Statistics Software (SPSS) for Mac-23 version, the data obtained in the interviews were analyzed by analyzing thematic category MAXQDA software 11-Data Analysis Qualitative Software (qualitative data analysis Software). Results: Were applicants in the accounts the idea of greater vulnerability associated with the male presence in the relationship, getting behind in speeches that the only relationship between women could be a protective factor. Reports emerged about the absence of further clarification about the existence, use and effectiveness of preventive inputs to STD's that can be used in relations between women. Were highlighted in the speeches that the alleged methods available would not own, or designed to prevent the STDs among women, considering that most of these means of prevention would be adaptations of existing methods, as the male condom or unlubricated adaptations of items which originally would be used for other purposes (plastic film, PVC gloves, latex barrier use in dentistry). Confidence in the partnership and in the existence of a presumed fidelity were cited as elements of prevention strategies. The bias was related to lack of campaigns that drive the lesbians on the need to prevent sexual relations, and stigma to the myth that lesbians would be marginalized women. The presence of the element constraint was highlighted as a factor preventing the search for Gynecological medical care. The lack of preparation of health professionals emerged as an element that can influence on increasing the vulnerability of this population health. More than half of the participants stated that often reveal their sexual orientation to doctors gynecologists, which may indicate a breakthrough for Lesbian visibility. It is concluded that the factors of programmatic can influence more evident to the worsening in the situations of vulnerability to health of lesbians, although elements of individual and social dimension also are associated and these misdeeds. These findings may serve as a framework that highlights elements of individual, social order, as well as deficiencies in programmatic, that relate and can influence for the most vulnerable situation in health of lesbians.
Introdução: O presente estudo teve como objetivo geral analisar a vulnerabilidade e as práticas preventivas frente às Doenças Sexualmente Transmissíveis (DST`s) nas relações afetivo-sexuais de lésbicas. Método: Tratou-se de um estudo exploratório e descritivo, de caráter transversal e qualitativo. A amostra foi composta por 18 participantes mulheres que se autodefinem lésbicas, com idades variando de 19 a 42 anos (M=26; DP=6,1). Para a coleta dos dados foram utilizados um questionário sociodemográfico e entrevistas semiestruturadas. A coleta partiu de uma participante matriz e seguiu a seleção de novas participantes pelo método de “bola de neve”. Os dados oriundos do questionário sociodemográfico foram analisados por meio de estatísticas descritivas no Software PASW Statistics (SPSS) for Mac - versão 23, os dados obtidos nas entrevistas foram analisados por meio da análise categorial temática através do software MAXQDA 11 - Qualitative Data Analysis Software (Software de Análise de Dados Qualitativos). Resultados: Foram recorrentes nos relatos a ideia de maior vulnerabilidade associada a presença masculina na relação, ficando subjacente nos discursos que o relacionamento apenas entre mulheres poderia ser um fator de proteção. Emergiram relatos sobre a ausência de maiores esclarecimentos acerca da existência, formas de uso e eficácia de insumos preventivos às DST’s que possam ser utilizados nas relações entre mulheres. Foram evidenciados nos discursos que os supostos métodos existentes não seriam próprios, específicos ou pensados para na prevenção às DST’s entre mulheres, tendo em vista que a maioria destes meios de prevenção seriam adaptações de métodos já existentes, como o preservativo masculino sem lubrificação ou adaptações de itens que originalmente seriam utilizados com outras finalidades (plástico filme de PVC, luvas, barreira de látex de uso odontológico). A confiança na parceria e na existência de uma fidelidade presumida foram elementos citados como estratégias de prevenção. O preconceito foi relacionado à ausência de campanhas que orientem às lésbicas sobre a necessidade de prevenção nas relações sexuais, e o estigma ao mito de que lésbicas seriam mulheres marginalizadas. A presença do elemento constrangimento foi destacado como um fator impeditivo para a busca por atendimento médico ginecológico. A falta de preparo dos profissionais de saúde emergiu como um elemento que pode influenciar no aumento da vulnerabilidade em saúde desta população. Mais da metade das participantes afirmaram que costumam revelar sua orientação sexual aos médicos ginecologistas, o que pode indicar um avanço para à visibilidade lésbica. Conclui-se que fatores de ordem programática podem influenciar de maneira mais evidente para o agravo nas situações de vulnerabilidade a saúde de lésbicas, embora elementos de dimensão individual e social também estejam associados e estes agravos. Estes achados podem servir como um quadro que evidencia elementos de ordem individual, social, bem como deficiências programáticas, que se relacionam e podem influenciar para a situação de maior vulnerabilidade em saúde das lésbicas.
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3

Hasin, Panitat. "Developing New Types of Electrode Materials for Dye-Sensitized Solar Cells (DSSCs)." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1258071882.

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4

Zoppa, Robert J. "The future use of DSCS and commercial satellites in the U.S. Navy." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA285707.

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Thesis (M.S. in Systems Technology (Space Systems Operations)) Naval Postgraduate School, September 1994.
Thesis advisor(s): Dan C. Boger. "September 1994." Bibliography: p. 96-97. Also available online.
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5

Hernández, Redondo Ana. "Copper(I) polypyridine complexes : the sensitizers of the future for dye-sensitized solar cells (DSSCs) /." [S.l.] : [s.n.], 2009. http://edoc.unibas.ch/diss/DissB_8757.

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6

Hua, Yong. "Design and synthesis of new organic dyes for highly efficient dye-sensitized solar cells (DSSCs)." HKBU Institutional Repository, 2014. https://repository.hkbu.edu.hk/etd_oa/71.

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Анотація:
Dye-sensitized solar cell (DSSC) has attracted increasing interest as a promising hybrid organic-inorganic solar cell. At the heart of the device is a photosensitizer, which is anchored onto a wide-bandgap semiconducting metal oxide. It harvests solar light and transfers the energy via electron transfer to a suitable material (e.g. TiO2) to produce electricityas opposed to chemical energy in plant. The topic of this thesis focuses on the design and synthesis of metal-free organic dyes for applications in DSSCs. Specific attention has been paid to the correlation between the molecular structures and physical properties, as well as their performances in DSSCs. Chapter 1 presents the major components and working principle of DSSC, following by a brief overview of the development of organic dyes and their application in DSSCs. In chapter 2, we have designed two types of new phenothiazine-based dyes to investigate the positioning effect a donor group on the cell performance. The structural features of a donor aryl group at the C(7) position of phenothiazine core extend the π-conjugation of the chromophore and efficiently suppress the dye aggregation on TiO2 film. As a result, Type 1 dyes have better light harvesting properties in contact with TiO2 films, and give much better photovoltaic performance than Type 2 dyes. Chapter 3 presents the synthesis and characterization of a series of simple phenothiazine-based dyes, in which, a linear electron-rich (4-hexyloxy)phenyl group at C(7) of the phenothiazine periphery as the donor, and an alkyl chain with different length at N(10). The dye molecules show a linear shape which is favorable for the formation of a compact dye layer on the TiO2 surface, while their butterfly conformations can sufficiently inhibit molecular aggregation. Moreover, the alkyl substituents with different chain length at N(10) could further optimize the performance through complete shielding the surface of TiO2 from the Iˉ/I3ˉ electrolyte. Under simulated AM 1.5G irradiation, the PT-C6 based DSSC produces a short-circuit photocurrent of 15.32 mAcm−2, an open-circuit photovoltage of 0.78 V, a fill factor of 0.69, corresponding to a power conversion efficiency (PCE) of 8.18%. Moreover, we designed a stepwise approach for co-adsorption of the organic dye PT-C6 with a porphyrin dye (ZnP) for DSSCs. Upon optimization, the device made of the PT-C6 + ZnP system yielded Jsc = 19.36 mA cm-2, Voc =0.735 V, FF = 0.71 and η = 10.10%. In chapter 4, we further developed five organic dyes appended with T, TT, E, ET, or EE (T and E denote thiophene and 3,4-ethylenedioxythiophene (EDOT), respectively) on the C(7) atom of phenothiazine core as electron donors. We have also analyzed the structure-performance corelations of dye molecules in the aspect of dye aggregation, electron injection, dye regeneration and interfacial charge recombination of electrons with electrolytes and/or oxidized dye molecules, through DFT calculation, impedance analysis and transient photovoltage studies. In chapter 5, we extended our studies by using phenothiazine as a building block to construct 3D bulky organic dyes. We systematically investigated the influence of 3D bulky substituents on dye aggregation and charge recombination, as well as photovoltaic performance of DSSCs. The molecular design strategy demonstrates that high Voc can be realized by employing 3D-phenothiazine dyes featuring a bulky substituent, such as, hexylcarbazole and dihexylfluorene units. Impressively, the co-adsorbent-free DSSCs based on dye TP3 exhibits a photovoltaic performance with efficiency up to 8.00 %. In order to realize a panchromatic absorption and further enhance the energy conversion efficiency of DSSCs, we also designed a stepwise approach for co-adsorption of the organic dye TP3 with a NIR dye YR6 for co-sensitized DSSCs. Upon optimization, the device made of the TP3 + YR6 system yielded Jsc = 19.18 mA cm-2, Voc =0.721 V, FF = 0.712 and η = 9.84 %. The power-conversion efficiency is the highest reported efficiency for a squaraine dye-based co-sensitized panchromatic DSSCs. From chapters 6 and 7, a series of new simple panchromatic dyes based on thiadiazolo[3,4-c]pyridine (PyT) have been designed for panchromatic DSSCs. These new organic dyes exhibit broad absorption spectrum in the range of 300~850 nm and high molar extinction coefficients. The electrochemical analyses demonstrate that the incorporation of the auxiliary electron-deficient thiadiazole[3,4-c]pyridine unit can fine-tune the HOMO and LUMO energy levels and red-shift the absorption spectra to NIR region. The overall conversion efficiencies of liquid-electrolyte DSSCs based on these sensitizers range from 0.46 to 6.30 %. We draw some conclusions in chapter 8 together with the outlooks in DSSCs
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7

Spiassi, Ana Lúcia. "Conversas com o movimento social negro sobre vulnerabilidades em relação às DSTs/Aids." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/5/5137/tde-04052011-170701/.

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A intensificação do debate sobre a epidemia de DST/aids na população negra, trazida por entidades da sociedade civil na última década, aparece na esteira da recente sistematização de políticas voltadas para a saúde desta população. O objetivo do presente estudo foi conhecer a avaliação que o movimento social negro do ABC paulista tem sobre as condições de vulnerabilidade em relação às DST/aids vividas pelos cidadãos negros da região. Trata-se de estudo qualitativo, construído com base em entrevistas individuais em profundidade com lideranças diversas deste movimento. A representatividade dos entrevistados foi ancorada no conceito de Luta por Reconhecimento e a estrutura das entrevistas foi organizada a partir do conceito teórico orientador de todo o trabalho que é o conceito de Vulnerabilidade. A construção e interpretação das entrevistas foram apoiadas em uma concepção de linguagem entendida como desveladora de processos de interação a partir do cotejo de duas tradições filosóficas principais: o materialismo histórico dialético e a hermenêutica. As avaliações dos entrevistados sobre as três dimensões de vulnerabilidades vivenciadas pelos negros em relação às DST/aids, produziram um quadro no qual diversas situações cotidianas são relatadas e discutidas. No plano institucional, três grupos centrais de problemas foram levantados: as condições de atendimento nos serviços de saúde; a atuação do Estado sobre as condições de iniquidade e a relação do Estado com o movimento social. Em relação às vulnerabilidades sociais, foram destacadas as desigualdades sócio-econômicas entre negros e não-negros e suas consequências, que incluem a persistência de baixa escolaridade, precarização das moradias, fixação da população negra para a periferia das áreas urbanas, barreiras à ascensão social, desigualdades sociais em saúde e a persistência da discriminação racial nas relações sociais. Em relação às vulnerabilidades individuais, os entrevistados relataram algumas de suas vivências pessoais e familiares em que sobressaem os sentimentos de insegurança e desrespeito trazidos pela tensão da discriminação racial, o que tem implicações não apenas morais, mas manifesta-se também no modo como os sujeitos vivenciam, apreendem e lidam com os aspectos dos demais planos de vulnerabilidade, acima citados. Os entrevistados apontaram, ainda, alternativas de reconstrução prática com potencial de redução do impacto da vulnerabilidade para a aids entre os brasileiros negros
The intensified discussion about the STD/AIDS epidemic among black population, brought about by civil society organizations in the last decade, appears in the wake of recent policies aimed at health of this population. The objective of this study was to explore the assessment that the black social movement in the ABC region (State of SP) make about vulnerability conditions regarding STD/AIDS experienced by black citizens from the region. This is a qualitative study, built on individual in-depth interviews with several leaders of this movement. Representativeness of respondents was based on the concept of \"Struggle for Recognition\", and the structure of the interviews on the theoretical concept of Vulnerability that guided the whole work. The structure and interpretation of interviews were backed by designing a language understood as unfolding processes of interaction based on confrontation of two major philosophical traditions: historical dialectical materialism and hermeneutics. The evaluations of the respondents about the three dimensions of vulnerability experienced by brazilian blacks in relation to STD/AIDS, resulted in a framework in which many daily situations are reported and discussed. At institutional level, three core groups of issues were raised: the conditions of care in health services, State action concerning inequity conditions and the relation between the State and social movements. As to social vulnerabilities, socioeconomic inequalities and their consequences were highlighted between blacks and non-blacks, including persistence of low schooling, precarious housing, setting the black population in the periphery of urban areas, barriers to social mobility, health inequalities and persistence of racial discrimination in social relations. In relation to individual vulnerabilities, respondents reported some of their personal and family experiences that stress feelings of lack of confidence and disrespect due to tension resulting from racial discrimination, which has moral implications and also manifests in how the subjects experience, perceive and deal with vulnerability aspects at other levels, as mentioned above. Yet, the interviewees pointed out practical reconstruction alternatives with potential to reduce the impact of vulnerability to AIDS among black Brazilians
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8

Recuero, Maira Guedes Piltcher. "INVESTIGANDO POSSÍVEIS IMPACTOS DAS POLÍTICAS PÚBLICAS DE PREVENÇÃO A DSTs / HIV EM ADOLESCENTES." Universidade Catolica de Pelotas, 2008. http://tede.ucpel.edu.br:8080/jspui/handle/tede/34.

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This article has as a purpose to know the prevention politics for Sexual Transmitted Diseases/SIDA of the Ministry of Health of Brazil, proposed to teenagers, and, supported on this analysis, to evaluate the impact suffered for them. As a methodology, the researcher used as a procedure the qualitative research, recording interviews. These interviews were made in two schools from Pelotas, with 12-18 year teenagers, selected without any specific criteria. Then, the researchers analyzed the content of the interviews, limiting this not only to analysis on the teenagers recognition of the prevention politics, but also on the changes needed to this behavior become effective. The collected data was transcripted in order to a posterior examination and classified into categories. These categories were emerged from the oral interviews. The investigators observed the existence of differences between the proposed politics and the developed actions, thus not contributing to adoption of less risky health behaviors. The results showed that the basis of all prevention politics may be centered in a citizen building
Este trabalho tem como objetivo conhecer as políticas de prevenção a DSTs/HIV do Ministério da Saúde do Brasil, propostas a adolescentes, e, com base nessa análise, avaliar os impactos que tais políticas exercem sobre eles. Para tanto, procedeu-se a uma pesquisa qualitativa, usando-se entrevistas gravadas como método. Estas foram realizadas em duas escolas na cidade de Pelotas, com adolescentes em idade de 12 a 18 anos, selecionados de forma aleatória. Fundamentando-se no exame do conteúdo dos depoimentos, procurou-se delimitar o reconhecimento, pelos adolescentes, das políticas o desenvolvidas com esse intuito, bem como identificar as mudanças desencadeadas a um comportamento preventivo eficaz. Os dados coletados foram transcritos a fim de posterior exame e classificação das categorias que emergiram das falas. Observou-se a existência de uma dissociação entre as políticas propostas e as ações desenvolvidas, e, desta maneira, não contribuindo para adoção de comportamentos menos arriscados à saúde. Os resultados apontaram que a base de todo trabalho de prevenção, visando à mudança de comportamento, deve estar centrado na construção da cidadania, objetivando atingir seu propósito
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9

Osborn, Robert John. "Isolation of ambient aerosols of known critical supersaturation: the differential critical supersaturation separator (DSCS)." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/5987.

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A field-deployable instrument has been developed that isolates from an ambient aerosol population only those particles that have critical supersaturations, Sc, within a narrow, user-specified, range. This Differential Critical Supersaturation Separator (DScS) is designed to supply one or more particle size and/or composition analyzers to permit the direct examination of the factors that influence the activation properties of ambient aerosols. The DScS consists of two coupled parallel plate continuous flow thermal gradient diffusion cloud chambers housed within a single enclosure. Descriptions of instrument operation, construction and calibration data collected, when pure ammonium sulfate aerosols were injected into the DScS for operation at 0.15%< Sc<0.175%, 0.30%< Sc<0.35%, and 0.60% < Sc<0.70%, are included. Following instrument development, the DScS was deployed during March 2006 for the Megacities Impact on Regional And Global Environment (MIRAGE) field campaign in Mexico City, Mexico. Throughout the MIRAGE field campaign a Differential Mobility Analyzer/Tandem Differential Mobility Analyzer (DMA/TDMA) system measured aerosol size distributions and size-resolved hygroscopicity of DScS separated aerosol. The dry diameter (Dp*) of particles sampled in the TDMA system as well as the known Sc prescribed in the DScS were combined in a modified version of Köhler Theory to make predictions of particle hygroscopicity. These predictions frequently overestimated the measurements. Further analysis of DScS separated aerosols compares the known particle Sc to a predicted particle Sc, providing insight into particle activation efficiency. Overall, the sampled aerosol exhibited properties that indicate they were more efficient at activation than Köhler Theory would predict.
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10

Ribeiro, Karla Carolina Silveira. "Adolescência e sexualidade: vulnerabilidade às DSTS, HIV/AIDS e a gravidez em adolescentes paraibanos." Universidade Federal da Paraí­ba, 2011. http://tede.biblioteca.ufpb.br:8080/handle/tede/6878.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Based on the conception that beliefs concerning sexuality play an important role in the behavior of adolescents, it was used the Foucault‟s perspective in order to identify the characteristics and analyze the possible associations among the pregnancy in the adolescence, the STDs/AIDS, and the situations of vulnerability of adolescents who live in the state of Paraíba. The sample comprised 8.741 adolescents, been 62% female, in the age range of 12 to 20 years old (average of 16 years old), enrolled in public schools of 34 cities classified based on the demographic size according to the city social indicators. It was used a self-report structured questionnaire and the group technique of focal discussion. In order to analyze the quantitative date, it was used descriptive statistics, been used position and variability measures, besides it, it was performed bivariate tests. The analysis of the group‟s content was performed based on Categories which were determined based on the emerged themes. According to the results, three thematic categories have emerged. The first, which was denominated Sexual Practice (sub-categories: Sexual Initiation and Determinant Factors); the second was denominated Prevention (sub-categories: The Use of Condom and Contraceptive Methods); and the third category, Vulnerability to AIDS (sub-categories: Perception of Vulnerability and Information). Concerning to the Sexual Practice, 2.732 participants declared have an active sexual life (31%), with initiation in 15,6 years old to the women and 14,6 years old to men, with significant statistical difference in relation to the sex (64% male p < 0,001) and the size of the cities (minor indices in medium size cities). The differentiation of gender was also obtained in relation to the first sexual partner, mainly related to the age (average of 21 years old to women and 16 years old to men p < 0,05), been justified by the higher experience, responsibility, especially in the case of an undesired pregnancy. As factors which predispose to precocious sexual initiation, it was mentioned: the influence of couples, of media, the beliefs and cultural norms, and the use of alcohol. In the second category, Prevention, the nonsystematic use of condom was related to the inexperience, to the existence of negative beliefs, to the unpredictability of the action, to the difficult of obtainment and access, to the lack of information and sort of affective relationship. Only 59% of the adolescents declared to have some knowledge about contraceptive methods, been highlighted the male condom (43%) and the pill (33%), and the major knowledge by the female adolescents (80%). It was described the occurrence of 195 cases of pregnancy and 75 cases of abort. The reasons which led the pregnancy in adolescents are the lack of care, difficulty in the access to the contraceptive method and the guarantee of continuation of the relationship. In the category Vulnerability to AIDS, 83% of the adolescents who had already sexual relations did not think themselves as vulnerable and 15% of the total declared not receive information concerning HIV/AIDS. As sources of information were mentioned school (59%), family (22%), media (18%), and health professionals (16%); this last source with a higher percentage to the women and in the rural area. It is concluded that the normative social speech, mainly associated to the gender roles, reveal beliefs and behaviors in this stage of life, causing more female difficulty to the prevention. It was also observed that the information passed to this population still are presented as biological and moralist, putting in evidence the necessity of interventions which comprises beliefs and norms assumed by this population.
Partindo do pressuposto de que as concepções conferidas à sexualidade têm papel decisivo no comportamento dos adolescentes, fez-se uso da perspectiva foucaultiana com o objetivo de identificar as características e analisar as possíveis associações entre a gravidez na adolescência e as DSTs/AIDS às situações de vulnerabilidade de adolescentes residentes no Estado da Paraíba. A amostra foi composta por 8.741 adolescentes, sendo 62 % do sexo feminino, na faixa etária de 12 a 20 anos (média de 16 anos), matriculados em escolas públicas de 34 cidades classificados pelo porte demográfico de acordo com os indicadores sociais municipais. Como instrumento foi utilizado um questionário estruturado auto-aplicável e a técnica de grupo de discussão focal. Para análise dos dados quantitativos, utilizou-se de estatística descritiva, com a utilização de medidas de posição e de variabilidade, além da realização de testes bivariados. A análise dos conteúdos dos grupos foi realizada com base em Categorias determinadas a partir dos temas suscitados. A partir dos resultados, emergiram três categorias temáticas. A primeira denominada Prática Sexual (sub-categorias: Iniciação Sexual e Fatores Determinantes); a segunda denominada Prevenção (sub-categorias: Uso de Preservativo e Métodos Anticoncepcionais); e a terceira categoria, Vulnerabilidade à AIDS (sub-categorias: Percepção de Vulnerabilidade e Informações). No que se refere à Prática Sexual, 2.732 participantes declaram ter vida sexual ativa (31%), com iniciação aos 15,6 anos para o sexo feminino e aos 14,6 anos para o masculino, com diferença estatisticamente significante em relação ao sexo (64% masculino - p<0,001) e porte das cidades (menor índice em cidades de médio porte). A diferenciação de gênero também se manteve em relação ao primeiro parceiro sexual, principalmente em relação à idade (média de 21 anos para o feminino e 16 anos para o masculino - p<0,05), justificado pela maior experiência, responsabilidade, principalmente no caso de uma gravidez indesejada. Como fatores que predispõem à iniciação sexual precoce, foram citados: a influência dos pares, da mídia, as crenças e normas culturais e, o uso de álcool. Na segunda categoria, Prevenção, o uso assistemático do preservativo foi relacionado à inexperiência, a existência de crenças negativas, a imprevisibilidade do ato, a dificuldade de obtenção ou acesso, falta de informações e tipo de vínculo afetivo. Apenas 59% dos adolescentes afirmaram possuir algum conhecimento dos métodos contraceptivos, destacando-se o preservativo masculino (43%) e a pílula (33%), e o maior conhecimento pelas adolescentes (80%). Foi relatada a ocorrência de 195 casos de gravidez e 75 casos de aborto. Os motivos que levam a gravidez na adolescência é o descuido, dificuldade no acesso ao anticoncepcional e a garantia da manutenção do relacionamento. Na categoria Vulnerabilidade à AIDS, 83% dos adolescentes que já tiveram relação sexual não se percebem vulneráveis e 15% do total relataram não receber informações sobre o HIV/AIDS. Como fontes de informação foram citadas a escola (59%), família (22%), mídia (18%) e profissionais de saúde (16%), este último com maior percentual para o feminino e na zona rural. Conclui-se que os discursos sociais normalizantes, principalmente vinculados aos papeis de gênero, demarcam crenças e comportamentos nesta fase da vida, provocando maior dificuldade feminina na prevenção. Observou-se também que as informações repassadas a essa população ainda se apresentam de forma biológica e moralista, colocando em pauta a necessidade de intervenções que abordem as crenças e normas assumidas por essa população.
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Книги з теми "DSTCs"

1

Desmond, Ball. Code 777: Australia and the US defense Satellite Communications System (DSCS). Canberra: Strategic and Defence Studies Centre, Research School of Pacific Studies, Australian National University, 1989.

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Ball, Desmond. Code 777: Australia and the US Defence Satellite Communications System (DSCS). Canberra: Strategic and Defence Studies Centre, Research School of Pacific Studies, Australian National University, 1989.

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Zoppa, Robert J. The future use of DSCS and commercial satellites in the U.S. Navy. Monterey, Calif: Naval Postgraduate School, 1994.

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Boles, Melanie. AN1307, Stepper Motor Control with DsPIC DSCs. Microchip Technology Incorporated, 2019.

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5

Takenaka, Norio. AN1307 - Stepper Motor Control with DsPIC® DSCs. Microchip Technology Incorporated, 2020.

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6

Boles, Melanie. TB3141, Implementing the Fast Fourier Transform (FFT) on DsPIC DSCs. Microchip Technology Incorporated, 2015.

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7

Kirsch, Susan. Class B Safety Software Library for PIC MCUs and DsPIC DSCs. Microchip Technology Incorporated, 2014.

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8

Herftsttijd van de moderne tijd: Theologische visies op het postmoderne (DSTS-cahier). De Horstink, 1995.

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Dufseth, Rhonda. Pulse Oximeter Design Using Microchip's Analog Devices and DsPIC® Digital Signal Controller (DSCs). Microchip Technology Incorporated, 2015.

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10

Takenaka, Norio. AN1525 - Pulse Oximeter Design Using Microchip's Analog Devices and DsPIC® Digital Signal Controllers (DSCs). Microchip Technology Incorporated, 2016.

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Частини книг з теми "DSTCs"

1

Ikhlasi, Zakir, and Thomas Vincent. "Experimental Investigation of the Axial Load Capacity for DSTCs Manufactured with High Strength Concrete." In Lecture Notes in Civil Engineering, 334–41. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4293-8_35.

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2

Ma, Lanchao, and Xiaowei Zhan. "Dye-Sensitized Solar Cells (DSSCs)." In Organic Optoelectronics, 437–65. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527653454.ch10.

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3

Alashwali, Eman Salem, and Pawel Szalachowski. "DSTC: DNS-Based Strict TLS Configurations." In Lecture Notes in Computer Science, 93–109. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12143-3_9.

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4

Du, Yun, Xin Guo, Chenyang Shi, Yifan Zhu, and Bohan Li. "DSDCS: Detection of Safe Driving via Crowd Sensing." In Advanced Data Mining and Applications, 170–77. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-05090-0_15.

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Gardin, Chiara, Sara Ricci, and Letizia Ferroni. "Dental Stem Cells (DSCs): Classification and Properties." In Dental Stem Cells: Regenerative Potential, 1–25. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-33299-4_1.

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Zhou, Xiao, Chen Wang, Yangliang Zhang, Wen Fang, Yuzhi Hou, Chen Zhang, Xiaodong Wang, and Sining Yun. "Cell Efficiency Table of DSSCs with Various Counter Electrode Electrocatalysts." In Counter Electrodes for Dye-sensitized and Perovskite Solar Cells, 531–617. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527813636.app1.

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7

Kumar, Rahul, and Parag Bhargava. "Counter Electrodes in DSSCs Based on Carbon Derived from Edible Sources." In Counter Electrodes for Dye-sensitized and Perovskite Solar Cells, 71–92. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527813636.ch4.

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8

Choudhury, Abantika, Uma Bhattacharya, and Rituparna Chaki. "Dynamic Scheduling of Traffic Signal (DSTS) Management in Urban Area Network." In Computer Information Systems and Industrial Management, 132–43. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-28957-7_12.

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9

Kumbhkar, Akhilesh, Deepak Garg, Sarita Lamba, and Mahaveer Pingolia. "Variants of Cuckoo Search with Levy Flight and Dynamic Strategy Based Cuckoo Search (DSBCS)." In Second International Conference on Computer Networks and Communication Technologies, 787–96. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37051-0_88.

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10

Sheetal Bhale, Abhilasha Mishra, and Mazher Khan. "Implementation of DSTC and PSO Algorithm Using CLD to Improve the Performance of MANET." In Proceedings of the International Conference on Data Engineering and Communication Technology, 143–50. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1675-2_16.

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Тези доповідей конференцій з теми "DSTCs"

1

Shakir, Sehar, and Hafiz M. Abd-ur-Rehman. "Enhancement in Photovoltaic Performance of Dye Sensitized Solar Cells Using Cu and Cu:Ag Co-Doped TiO2 Photoanode." In ASME 2016 Power Conference collocated with the ASME 2016 10th International Conference on Energy Sustainability and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/power2016-59477.

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Dye Sensitized Solar Cells (DSSCs) are low cost solar cells offering big room for improvements in its photovoltaic performance by maneuvering semiconductor properties, dye adsorption, electrolyte stability etc. For the first time, we have co-doped TiO2 with silver (Ag) and copper (Cu) to enhance both charge collection and light absorption as well as reduce recombinations for DSSCs. For high solar cell efficiency 3wt% Cu and 3wt% Cu:Ag doped TiO2 nps were successfully prepared for Dye Sensitized Solar Cells (DSSCs). Modified photoanode was prepared using surface adsorbed N719 dye on doctor blade coated TiO2, Cu:TiO2 and Cu:Ag:TiO2 thin films. It was observed that optimum doping concentration of Cu and silver was 3wt% each. DSSCs with Cu:Ag:TiO2 thin film showed higher conversion efficiency under full sunlight illumination when compared to DSSCs assembled using Cu:TiO2 and undoped TiO2. The obtained efficiencies for DSSCs with undoped TiO2, Cu:TiO2 and Cu:Ag:TiO2 photoanodes were 2%, 2.7% and 4.5% respectively. Solar cells assembled with Cu only doped TiO2 electrode when compared with cells assembled using pristine TiO2, showed an increase in Voc while Jsc was decreased Furthermore, cells doped with both Ag and Cu showed enhancement in both Voc and Jsc. The enhancement in cell performance has been discussed in context of morphology, crystal phase, presence of bonds etc. in nanoparticles. Considering overall better performance, Cu:Ag doped TiO2 photoanodes can be considered as potential photoanodes in DSSCs.
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2

James, Sagil, and Karan Parikh. "Study on Selective Electroless Plating of 3D Printed Counter Electrodes for Dye-Sensitized Solar Cells." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2887.

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Abstract Dye-Sensitized solar cells (DSSC) are considered to be the replacement for traditional silicon solar cells. DSSCs have been noticed widely due to its simplified material handling, easy fabrication, durability and their ability to perform better under diverse lighting conditions. However, there are significant challenges that are faced by DSSCs such as lower efficiency, chemical instability, and leakage of the electrolyte under high-temperature conditions. The fabrication of counter electrodes for DSSCs require the use of expensive materials and techniques which increases the cost as well as limits mass production. These limitations can be addressed through a cost-effective fabrication process for counter electrodes of DSSCs. This research focuses on enhancing the conductivity and catalytic activity of the counter electrodes of DSSCs through a novel selective electroless plating technique. The proposed selective electroless plating technique helps to overcome the issues of high cost, toxicity, and complex manufacturing processing of conventional DSSC. Moreover, the fabrication of the DSSC is supplemented using additive manufacturing technology. The technique further helps to enhance the performance, provide excellent design flexibility while reducing the manufacturing cost. The results of the study show selective electroless plating is an effective technique for the fabrication of low-cost counter electrodes for DSSCs. The efficiencies of the DSSC are comparable with DSSC fabricated through conventional expensive and toxic materials.
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3

Hui, Rongqing, Wanjun Huang, Yuanyuan Zhang, Mahmood Hameed, Miguel Razo, Marco Tacca, and Andrea Fumagalli. "Digital subcarrier cross-connects (DSXCs)." In 2012 14th International Conference on Transparent Optical Networks (ICTON). IEEE, 2012. http://dx.doi.org/10.1109/icton.2012.6253737.

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4

Bardal, D., M. S. Trim, R. Tapia, J. A. A. Arias-Correa, and S. M. M. Baptista-Parra. "Reservoir Evaluation Using Interval Pressure Transient Test in Appraisal Gas Wells, Offshore Trinidad and Tobago." In SPE Energy Resources Conference. SPE, 2014. http://dx.doi.org/10.2118/spe-169977-ms.

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Abstract Hydrocarbon exploration is a challenging, costly and high-risk investment and success often requires further drilling of one or more appraisal wells to acquire data of the highest quality for reservoir evaluation and characterization before development plans can be put in place. During the exploration and appraisal stages it is important to define the reservoir fluid properties and reservoir parameters to enable accurate economic assessments. Three appraisal wells in two gas fields offshore Trinidad and Tobago were drilled in reservoir formations that are mainly unconsolidated sandstones with dry, biogenic gas. An extensive wireline logging program was planned which ranged from basic and advanced petrophysical logs to images and formation testers including the dual-packer module to perform interval pressure transient tests (IPTT) or ‘Mini-DSTs’ as these are also known. This was the first time in Trinidad and Tobago that IPTTs were conducted on appraisal gas wells. Technical factors influencing the decision to use an IPTT as opposed to a full Drill Stem Test (DST) included access to data from existing full DST's acquired in a nearby offset wells and a specific need to target thin-bedded and laminated sands so as to evaluate them individually and to observe vertical interference or connectivity between sand units. A combination of IPTT analysis and real-time downhole fluid characterization was applied to the appraisal wells which resulted in an improved understanding of the reservoir. The IPTT planning, methodology and applications, along with insights on some of the challenges encountered during operations which included changes to drilling operations in order to achieve the planned formation evaluation are presented.
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5

Li, Jinwei, and Yong Shi. "Electron Transport and Recombination in TiO2 Nanofiber Dye Sensitized Solar Cell." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64979.

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Dye sensitized solar cells (DSSCs), a new type of photo-electrochemical solar cells, are a promising alternative to the silicon based photovoltaic because they hold advantages of low cost, simple manufacturing processes and higher conversion efficiency compared with other types of excitonic solar cell. DSSCs with conversion efficiencies of up to 11% have been achieved with a highly stable electrolyte under AM1.5G conditions. Recently, one dimensional (1D) electrospun TiO2 nanofibers have been used as the DSSC photoanode to improve the electron transport efficiency and enhance the light harvest efficiency by scattering more light in the red part of the solar spectrum. In this paper, stepped light induced transient measurement of photocurrent and voltage (SLIM-PCV) has been employed to study electron transport and recombination in DSSCs. Electron diffusion coefficients and electron lifetimes were measured with differing light intensities. The electron diffusion coefficients and electron lifetimes strong correlate with intensity, which indicates the trap limited diffusion process for electrons in the TiO2 nanofiber DSSC.
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6

Peng, Edwin, and Halil Berberoglu. "Fabrication of a Dye Sensitized Solar Cell and Its Performance Dependence on Temperature and Irradiance." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44349.

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This paper reports the temperature and irradiance dependence of dye-sensitized solar cells (DSSCs) with acetonitrile-based electrolytes. The prototyped DSSCs had nanocrystalline titanium dioxide photoanodes and platinum thin film cathode. The photoanodes were sensitized with N-749 dye. The current-voltage characteristics of the DSSCs were measured at temperatures from 5 to 50 °C and under 500, 1000, and 1500 W m−2 irradiance. The open circuit voltage, VOC, decreased linearly with increasing temperature and had positive, logarithmic relation with irradiance. At temperatures lower than 15 °C, short circuit current density, JSC, was limited by the diffusion of I3− in the electrolyte and increased with increasing temperature. At higher temperatures the recombination of electrons injected into the TiO2 conduction band was dominant over diffusion and JSC decreased with increasing temperature. Moreover, JSC increaed linearly with increasing irradiance. The DSSC photoconversion efficiency did not vary appreciably at temperatures lower than 15 °C but decreased with increasing temperature. Finally, the efficiency increased with increasing irradiance.
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7

Byungkwan Yu, Yunyoung Noh, Jeungjo Han, and Ohsung Song. "MWCNT employed counter electrode for DSSCs." In 2011 IEEE Nanotechnology Materials and Devices Conference (NMDC 2011). IEEE, 2011. http://dx.doi.org/10.1109/nmdc.2011.6155405.

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8

Chitgar, Negar, Hamid Jazayeriy, and Milad Rabiei. "DSCTS: Dynamic Stochastic Cloud Task Scheduling." In 2019 5th Iranian Conference on Signal Processing and Intelligent Systems (ICSPIS). IEEE, 2019. http://dx.doi.org/10.1109/icspis48872.2019.9066063.

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9

Neild, Amy, Elizabeth Gibson, and Pablo Docampo. "Developing Tandem Solid-State DSCs." In 6th Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics. València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.iperop.2023.037.

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10

Amini, Mohammad Reza, Mahdi Shahbakhti, and Selina Pan. "MIMO First and Second Order Discrete Sliding Mode Controls of Uncertain Linear Systems Under Implementation Imprecisions." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5010.

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The performance of a conventional model-based controller significantly depends on the accuracy of the modeled dynamics. The model of a plant’s dynamics is subjected to errors in estimating the numerical values of the physical parameters, and variations over operating environment conditions and time. These errors and variations in the parameters of a model are the major sources of uncertainty within the controller structure. Digital implementation of controller software on an actual electronic control unit (ECU) introduces another layer of uncertainty at the controller inputs/outputs. The implementation uncertainties are mostly due to data sampling and quantization via the analog-to-digital conversion (ADC) unit. The failure to address the model and ADC uncertainties during the early stages of a controller design cycle results in a costly and time consuming verification and validation (V&V) process. In this paper, new formulations of the first and second order discrete sliding mode controllers (DSMC) are presented for a general class of uncertain linear systems. The knowledge of the ADC imprecisions is incorporated into the proposed DSMCs via an online ADC uncertainty prediction mechanism to improve the controller robustness characteristics. Moreover, the DSMCs are equipped with adaptation laws to remove two different types of modeling uncertainties (multiplicative and additive) from the parameters of the linear system model. The proposed adaptive DSMCs are evaluated on a DC motor speed control problem in real-time using a processor-in-the-loop (PIL) setup with an actual ECU. The results show that the proposed SISO and MIMO second order DSMCs improve the conventional SISO first order DSMC tracking performance by 69% and 84%, respectively. Moreover, the proposed adaptation mechanism is able to remove the uncertainties in the model by up to 90%.
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Звіти організацій з теми "DSTCs"

1

Cook, Robert. DSCS--Past, Present, and Future,. Fort Belvoir, VA: Defense Technical Information Center, November 1995. http://dx.doi.org/10.21236/ada300320.

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2

Rugg, Walter A. Defense Standard Ammunition Computer System (DSACS) Risk Analysis Report. Fort Belvoir, VA: Defense Technical Information Center, July 1988. http://dx.doi.org/10.21236/ada201161.

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3

Hassig, Nancy L., Brent A. Pulsipher, Greg W. Foltz, and Trisha Marie Hoette. Enhanced Chemical Incident Response Plan (ECIRP). Appendix F, remediation analysis with Decision Support Tools (DSTs) for wide-area chemical hazards. Office of Scientific and Technical Information (OSTI), July 2011. http://dx.doi.org/10.2172/1022186.

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4

Weier, Dennis R., and Kevin K. Anderson. Estimation of Maximum Wall Thickness Loss of Five DSTs (AN-107, AP-102, AW-101, AZ-102, and SY-101). Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/877062.

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