N+3 and N+4 Generation Aeropropulsion Engine Combustors: Part 2 — Medium Size Rich-Dome Engines and Lean-Domes

2013 ◽  
Author(s):  
Hukam C. Mongia
Keyword(s):  
Second Generation ◽  
Comprehensive Assessment ◽  
The Other ◽  
Medium Size ◽  
Other Hand ◽  
Fuel Burn ◽  
Potential Applications ◽  
Funding Support

Comprehensive assessment of the medium size rich-dome engines was conducted leading to the following emissions correlations: (1) LTO NOx = 1.129 × OPR 1.0899 with R 2 = 0.9248 Takeoff NOxEI given by (2) NOxEI = 0.0729 × OPR 1.7197 with R 2 = 0.9603 COEI idle = 396.42 NOxEI Takeoff 0.814 These correlations may be compared with the following for the CFM56 Tech Insertion: Takeoff NOxEI CFM_TI = 0.0744 × OPR 1.7151 Idle COEI CFM_TI = 396.42 Takeoff NOxEI 0.814 Idle HCEI CFM_TI = 0.1609 × Idle COEI - 3.1959 TALON II takeoff NOxEI data are reproduced well by: NOxEI TALON II = 0.0167 × OPR 2.1403 TALON II gives 10% lower NOx at 26 OPR and its NOx is comparable with the CFM_TI at 34 OPR. The CFM DAC technology is competitive with LEC’s for the low rated thrust engines. However, interaction between the two domes leads to early quenching with resultant higher idle COEI plateau. On the other hand, the 40 OPR lean DAC gave 25% higher NOx than LEC. Moreover, lean DAC (Gen-1) impacted fuel burn adversely making its likelihood to continue as product discouraging. The second generation lean dome technology initially kicked off under NASA sponsorship with significantly larger funding support from the CFMI and GE Aviation (GEA) led to successful introduction of TAPS into products (GEnx-1B and Gen-2B) with potential applications in other future GEA engines.

New uses for brick-making clay materials from the Bailén area (southern Spain)

Clay Minerals ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 453-465 ◽  
Author(s):  
I. Gonzalez ◽  
E. Galan ◽  
A. Miras ◽  
P. Aparicio
Keyword(s):  
Particle Size ◽  
Iron Oxides ◽  
Raw Materials ◽  
The Other ◽  
Southern Spain ◽  
Other Hand ◽  
Floor Tiles ◽  
Potential Applications ◽  
Clay Materials

AbstractAn attempt has been made to assess new potential applications for the Bailén clays, traditionally used for manufacturing bricks, based on mineralogical, chemical, particle size, plasticity and firing results. Raw materials and mixtures used by the local factory were selected and tested with the addition of some diatomite, feldspar or kaolin. Based on their properties, clay materials from Bailén might be suitable for making porous red wall tiles, clinker, vitrified red floor tiles and porous light-coloured wall tiles by pressing; the first could be manufactured from the raw materials and mixtures currently used by the local manufactures. On the other hand, stoneware shaped by extrusion, such as perforated bricks, facing bricks and roofing tiles, can be also manufactured from the mixtures used at the factory if they contain 20-25% carbonate and small amounts of iron oxides; lightweight bricks require black and yellow clays with diatomite.

Computerized Fieldwork Data Base: Applications and Implications

1987 ◽  
Vol 54 (5) ◽  
pp. 263-267 ◽  
Author(s):  
Helen Polatajko ◽  
Marilyn Ernest ◽  
Joyce MacKinnon
Keyword(s):  
Data Base ◽  
Educational Programs ◽  
The Other ◽  
Other Hand ◽  
Resultant Data ◽  
Potential Applications ◽  
The One ◽  
The University ◽  
Professional Judgement

Fieldwork placement is a complicated and involved task. On the one hand, it requires insightful, professional judgement, but on the other hand, it includes numerous routine administrative and clerical tasks. To deal with fieldwork placement more efficiently and effectively it was decided to computerize the fieldwork placement system at the University of Western Ontario, London, Ontario. This paper describes the system developed and the resultant data base. The potential applications of the data base and the implications for students, facilities, educational programs, professional governing bodies and research are discussed.

Influence of adenosine triphosphate on the isolated perfused mesenteric artery of the rabbit

1983 ◽  
Vol 61 (11) ◽  
pp. 1409-1417 ◽  
Author(s):  
V. S. R. Krishnamurty ◽  
P. J. Kadowitz
Keyword(s):  
Adenosine Triphosphate ◽  
Mesenteric Arteries ◽  
The Other ◽  
Receptor Blocker ◽  
Medium Size ◽  
Inhibitory Influence ◽  
Vasodilator Response ◽  
Other Hand ◽  
Vasoconstrictor Response ◽  
Dose Dependent

The vascular effects of adenosine triphosphate (ATP) were examined in the isolated perfused mesenteric arteries of the rabbit. Bolus injections of ATP (1 × 10−8 to 10−6 mol) induced a dose-dependent vasoconstrictor response at resting perfusion pressure, while continuous perfusion with ATP briefly elicited a vasoconstrictor response which was not maintained. Perfusion with phentolamine (2.65 × 10−6 M, an α-adrenergic receptor blocker), indomethacin (8.37 × 10−6 M, an inhibitor of cyclooxygenase), atropine (1 × 10−7 M, a muscarinic receptor blocker), and hydralazine (2 × 10−4 M, a vascular smooth muscle inhibitor) for a period of 1 h had no effect on vasoconstrictor responses to ATP. However, pretreatment with reserpine (2 mg∙kg−1∙day−1 for 2 days), an agent which depletes catecholamines, potentiated responses to ATP. On the other hand, when vascular tone was increased with an isoosmotic 60 mM K+ depolarizing Krebs bicarbonate solution, bolus injections of ATP elicited a prominent dose-dependent vasoconstriction followed by a prominent vasodilation. The degree of vasodilation but not of vasoconstriction elicited by ATP was greater in small terminal arteries with branches (<0.5 mm outside diameter (o.d.)) than in the medium size arteries (≤1 mm o.d.) without terminal branches. Both the vasoconstrictor and vasodilator responses were unaffected by a perfusion with atropine, indomethacin, or eicosatetraynoic acid (ETYA, 1 × 10−4 M) for 1 – 2 h. The vasoconstrictor responses were potentiated while the vasodilator responses were inhibited significantly by perfusion with propranolol (3 × 10−6 M) and phentolamine (2.65 × 10−6 M) together for 1 h or by pretreatment with reserpine followed by cold storage at 2 °C for 24 h. Perfusion with 8-phenyltheophylline (4 × 10−6 M (8-PT), an adenosine receptor blocker) for 1 h significantly inhibited by the vasodilator responses to bolus injections of adenosine but not to ATP. Further, ATP but not adenosine elicited a much more prominent vasodilator response on norepinephrine (NE) induced tone than on 60 mM K+. These studies suggest that ATP may induce vasoconstriction independent of activation of α-adrenergic or muscarinic receptors or enhanced synthesis of prostaglandins. This vasoconstriction is resistant to the inhibitory influence of hydralazine. On the other hand, the vasodilator response to ATP may be mediated through its interactions with released or circulating norepinephrine.

scholarly journals Potential Applications in Relation to the Various Physicochemical Characteristics of Al-Hasa Oasis Clays in Saudi Arabia

2020 ◽  
Vol 10 (24) ◽  
pp. 9016
Author(s):  
Ibrahim A. Al-Hawas ◽  
Salah A. Hassan ◽  
Hany M. AbdelDayem
Keyword(s):  
Saudi Arabia ◽  
Adsorption Process ◽  
Physicochemical Characteristics ◽  
Methanol Conversion ◽  
The Other ◽  
Distribution Analysis ◽  
Removal Capacity ◽  
Other Hand ◽  
Potential Applications ◽  
Mineralogical Compositions

In this work, various physicochemical characteristics, e.g., surface properties and mineralogical compositions, of five clays collected from different sites in the Al-Hasa oasis in Saudi Arabia have been investigated. Analysis of the mineralogical compositions of the clays in the study by X-ray diffraction indicated the coexistence of palygorskite, montmorillonite, illite, kaolinite, chlorite, calcite and quartz in different percentages. Thermogravimetric analysis indicated that all studied clays exhibited dehydroxylation temperatures higher than 470 °C. On the other hand, pore size distribution analysis of clays from N2 adsorption indicated the presence of micro- and narrow mesopores (of 1.3–2.8 nm). Furthermore, the capability of the different clays for removal of Pb (II) from aqueous solution has been studied. The adsorption process was described through the Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models. The Langmuir model was the most suitable compared to the other models in the case of palygorskite- and montmorillonite-rich clays. However, the Temkin model better represented the adsorption process of Pb (II) on calcite-rich clay. The clay sample with 61.0 wt% of palygorskite was found to be the most effective at removing Pb (II), with a maximum removal capacity of 74.07 mg/g at pH 6, with a contact time of 6 h and at 25 °C. Generally, the adsorption mechanism of lead over all the studied clays followed the pseudo-second-order kinetics. On the other hand, the catalytic activity of clays in the study has been tested in methanol conversion. The acidic clays, those containing high amounts of montmorillonite, showed higher selectivity to ethylene, viz., 78.9%, with a methanol conversion of 39.1% at 350 ° C and 0.1 MPa.

The Cosmopolitanism of the Poor

2017 ◽  
Author(s):  
Silviano Santiago ◽  
Magdalena Edwards ◽  
Paulo Lemos Horta
Keyword(s):  
Private School ◽  
Second Generation ◽  
The Other ◽  
Luxury Hotels ◽  
The Poor ◽  
Other Hand ◽  
Silviano Santiago ◽  
Cultural Connections ◽  
Second Generation Migrants ◽  
Afro Brazilian

Writing in the Luso-Brazilian context, Silviano Santiago again calls for a cosmopolitanism from below. In Portugal, he writes, elite cosmopolitanism is bound up with the legacy of empire and empire-returned captains of commerce; it tends to be found in private school and luxury hotels. For the poor who leave Portugal for Paris, by contrast, cosmopolitanism is more likely to register as an experience of loss—perhaps most poignantly, among second-generation migrants, loss of the Portuguese language itself, a closing off rather than an expansion of familial and cultural connections. On the other hand, Santiago also contrasts the Europhile and state-sanctioned cosmopolitanism of Brazilian diplomats with the vibrancy of more popular modes of cosmopolitanism that emerge from the favelas and draw upon Afro-Brazilian histories and South-South resonances.

The Holocaust, Second-Generation Witness, and the Voluntary Covenant in American Judaism

1995 ◽  
Vol 5 (1) ◽  
pp. 23-47 ◽  
Author(s):  
Alan L. Berger
Keyword(s):  
Popular Culture ◽  
Second Generation ◽  
Western Culture ◽  
The Other ◽  
American Popular Culture ◽  
American Judaism ◽  
Television Shows ◽  
Other Hand ◽  
The Holocaust ◽  
The One

Widespread discourse about the Holocaust entered American popular culture in the seventies in two main ways: a series of television shows that purportedly focused on the destruction of European Judaism and two books that dealt specifically with the children of survivors. The television miniseries, Gerald Green's Holocaust (1978), suited the national need for simplified history and melodrama. Moreover, given the American penchant for ethnic identifiers, Holocaust became known as the Jewish Roots. The networks soon aired other Holocaust programs, including Herman Wouk's far less commercially successful The Winds of War. The resultant Holocaust discourse was frequently poorly informed and historically naive. On the one hand, it reflected a tendency in Western culture to think that the Holocaust ended definitively in 1945. On the other hand, this discourse frequently neutralized the evil of nazism.

scholarly journals The principle of vulnerability and its potential applications in bioethics

2016 ◽  
Vol 6 (3-4) ◽  
pp. 181-186
Author(s):  
Enikő Demény
Keyword(s):  
The Other ◽  
Ethical Action ◽  
Other Hand ◽  
Potential Applications ◽  
Potential Benefits ◽  
The One ◽  
The Relationship ◽  
European Bioethics

Abstract The principle of vulnerability is a specific principle within European Bioethics. On the one hand, vulnerability expresses human limits and frailty on the other hand it represents moral and ethical action principles. In this paper a discussion on the relationship between the concepts of autonomy, vulnerability and responsibility is proposed and presentation of some possible applications of the principle of vulnerability within bioethics. In conclusion, some potential benefits of applying the principle of vulnerability as well as possible difficulties in its application are highlighted.

scholarly journals Bioinspired Fog Collection Surface of Conical Brass With Gradient Wettability

2021 ◽  
Author(s):  
yanling wan ◽  
Caiyun Zhang ◽  
Pu Cui ◽  
Huadong Yu
Keyword(s):  
Fresh Water ◽  
Chemical Etching ◽  
Pine Needles ◽  
The Other ◽  
Step Process ◽  
Fog Collection ◽  
Other Hand ◽  
Potential Applications ◽  
Droplet Movement

Abstract How to obtain more fresh water from nature economically and efficiently is a hot issue that needs to be solved urgently. Herein, inspired by the directional fog collection ability of the surface of pine needles, a wettability-gradient-brass-cone (WGBC) was prepared through a two-step process of precision cutting and chemical etching, producing a surface with functions of fog collection and droplet movement to the root of the cone. On the other hand, through experimental exploration and optimization of taper parameters, the excellent directional collection velocity of droplets was obtained. This work may direct the design of gradient wetting surfaces by mimicking the structure of pine needles and explore potential applications in fog harvesting.

Thomas Cyrcetur, a Fifteenth-century Theologian and Preacher

1986 ◽  
Vol 37 (2) ◽  
pp. 205-239 ◽  
Author(s):  
R. M. Ball
Keyword(s):  
Fifteenth Century ◽  
Second Generation ◽  
The Other ◽  
Pastoral Work ◽  
Other Hand ◽  
The University

Thomas Cyrcetur belonged to the second generation of anti-Wycliffite theologians. He must have been born c. 1376, and was a Fellow of Merton College in 1395 or 1396 and until at least 1401. He had graduated BD by December 1417, and probably left the university for residence in Somerset about 1418/19. The immediate Wycliffite threat had thus passed by the time of his Oxford career, and he was not involved in scholastic polemic against Wyclif. On the other hand, he was little influenced by the new orthodox outlook which developed in the universities and in London from the 1420s onwards. He had left Oxford by the time of the publication of Dr Thomas Walden's (alias Netter's) Doctrinale antiquitatum ecclesie, with its new patristic approach to combating heresy, and he shows no sign of acquaintance with that work, although it achieved immediate success. He had long ceased to reside in the university, and was of advanced years, by the time of the opposition to Bishop Pecock in the 1440s and 1450s, which was led by a group of theologians, many from Cambridge but including some Oxford men, whose approach appears also to have been patristic as well as consciously orthodox, and whose best-known member is Thomas Gascoigne. Cyrcetur's approach to theology remained conservative, but it was also pastoral. Even before he graduated BD he took an interest in pastoral work.

Measurements and Potential Applications of Force-Control Method for Stick-Slip-Driven Nanohandling Robots

2011 ◽  
Vol 467-469 ◽  
pp. 1556-1561 ◽  
Author(s):  
Christoph Edeler
Keyword(s):  
Mobile Robots ◽  
Force Control ◽  
Control Method ◽  
The Other ◽  
Force Generation ◽  
Stick Slip ◽  
The Real ◽  
Other Hand ◽  
Potential Applications ◽  
Application Potential

This paper describes the transition of a recently invented force-generation method to mobile nanohandling robots and outlines future applications. The presented mobile nanohandling robot makes use of miniaturized, piezo-driven Stick-Slip actuators. This allows for very accurate and fast positioning. The drives are fully developed and have proven their performance in fast pickand- place applications. On the other hand, the mentioned force-generation method allows a Stick- Slip axis to exert a dedicated force to any object, which could be useful in many micro- and nanohandling scenarios. However, the method was tested yet only in a testbed similar to the conditions in the robot. Therefore this paper deals with the extrapolation of the results to the real conditions in the robots and discusses benefits and drawbacks. After an introduction of the robot and the force-generation method, measurements are presented and discussed. The paper ends with a sketch of a possible application, which could boost the application potential not only of such mobile robots, but of Stick-Slip-based setups in general.

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