Готові списки джерел за темами / Active chamber

Добірка наукової літератури з теми "Active chamber"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Active chamber"

1

Armijos Moya, Tatiana, Marc Ottelé, Andy van den Dobbelsteen, and Philomena M. Bluyssen. "The Effect of an Active Plant-Based System on Perceived Air Pollution." International Journal of Environmental Research and Public Health 18, no. 15 (August 3, 2021): 8233. http://dx.doi.org/10.3390/ijerph18158233.

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Active plant-based systems are emerging technologies that aim to improve indoor air quality (IAQ). A person’s olfactory system is able to recognize the perceived odor intensity of various materials relatively well, and in many cases, the nose seems to be a better perceiver of pollutants than some equipment is. The aim of this study was to assess the odor coming out of two different test chambers in the SenseLab, where the participants were asked to evaluate blindly the level of acceptability, intensity, odor recognition, and preference at individual level with their noses. Two chambers were furnished with the same amount of new flooring material, and one of the chambers, Chamber A, also included an active plant-based system. The results showed that in general, the level of odor intensity was lower in Chamber B than in Chamber A, the level of acceptability was lower in Chamber A than in Chamber B, and the participants identified similar sources in both chambers. Finally, the preference was slightly higher for Chamber B over Chamber A. When people do not see the interior details of a room and have to rely on olfactory perception, they prefer a room without plants.
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2

Härtel, Volker. "Active two‐chamber engine mount." Journal of the Acoustical Society of America 86, no. 1 (July 1989): 452. http://dx.doi.org/10.1121/1.398761.

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3

Bremigan, Cary D. "Active acoustic attenuation mixing chamber." Journal of the Acoustical Society of America 92, no. 2 (August 1992): 1197. http://dx.doi.org/10.1121/1.404024.

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4

Khrushchinsky, A. A., and S. A. Kuten. "Primary Ionization Density Produced by Charged Fragments in the Working Volume of the Fission Chambers." Nonlinear Phenomena in Complex Systems 24, no. 4 (December 10, 2021): 329–37. http://dx.doi.org/10.33581/1561-4085-2021-24-4-329-337.

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Анотація:
The question of the spatial distribution of ion pairs created by 235U fission fragments in the active volume of the fission chamber has been studied. The formulas of the spatial distribution of ion pairs in cylindrical fission chambers are proposed, which allows you to evaluate correctly the density of ion pairs in any point in the sensitive volume of the fission chamber
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5

White, A. E. "Cloud chamber kit for active learning in a first-year undergraduate nuclear science seminar class." Physics Education 57, no. 4 (May 12, 2022): 045034. http://dx.doi.org/10.1088/1361-6552/ac5f0e.

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Abstract This paper presents the design and reports on the use of a simple and inexpensive cloud chamber kit that is compatible with active learning, experiential learning, and project-based learning strategies. The kit was developed for use in a first-year undergraduate nuclear science seminar class at a university in the US. Diffusion cloud chambers are commonly used in classroom demonstrations to teach students about cosmic rays and ionizing radiation. A variety of clever and novel cloud chambers found in the literature were built and tested as part of this work and are all suitable for instructor-led classroom demonstrations. However, each has drawbacks that limit its use in hands-on classroom activities as part of active learning, experiential learning, and project-based learning in the classroom. The purpose of this work was to develop a cloud chamber ‘kit’ that can be built in less than 10 min by students during class and guarantees student success in observing background radiation. The cloud chamber kit was found to be highly sensitive to background radiation, and several different types of high-energy particles, including muons or anti-muons, electrons or positrons, photoelectrons, and alpha particles, were detected and identified using the kits at a rate of over 20 tracks per minute measured indoors at sea level at latitude 42.3601° N. The simplicity of the cloud chamber kit presented here makes it compatible with a variety of best practices for active learning in the classroom and requires little preparation time outside of class.
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6

Sun, Jing, Ping Zeng, and Hai Long Lu. "Research on Piezoelectric Micropump of Combination of Active and Passive Valves." Applied Mechanics and Materials 680 (October 2014): 271–75. http://dx.doi.org/10.4028/www.scientific.net/amm.680.271.

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Анотація:
In order to improve the output characteristics of active piezoelectric pump valve, Research on dual-chamber tandem piezoelectric pump of combination of active and passive valves is proposed, And dual-chamber tandem piezoelectric pump of combination of active and passive valves is designed and study. The results show that maximum output flow of dual-chamber tandem piezoelectric pump of combination of active and passive valves is 540ml/min, the most output pressure is 27kPa,the maximum output flow of single-cavity active valve piezoelectric pump is 160ml/min;the most output pressure is 9.8kPa, obtained the conclusion that output flow and output pressure of the dual-chamber tandem of combination of active and passive valve is superior to single chamber active valve piezoelectric pump.
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7

Tang, Qinglong, Ramgopal Sampath, Manuel Echeverri Marquez, Priybrat Sharma, Ponnya Hlaing, Moez Ben Houidi, Emre Cenker, Junseok Chang, Gaetano Magnotti, and Bengt Johansson. "Optical diagnostics on the pre-chamber jet and main chamber ignition in the active pre-chamber combustion (PCC)." Combustion and Flame 228 (June 2021): 218–35. http://dx.doi.org/10.1016/j.combustflame.2021.02.001.

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8

Codd, Jonathan R., Ken J. Sanderson, and Alan J. Branford. "Roosting activity budget of the southern bent-wing bat (Miniopterus schreibersii bassanii)." Australian Journal of Zoology 51, no. 3 (2003): 307. http://dx.doi.org/10.1071/zo01079.

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Анотація:
The roosting activity budget of the southern bent-wing bat (Miniopterus schreibersii bassanii) was observed using remote-controlled infrared-illuminated video-cameras. Bat activity was assessed using scan sampling, conducted in 98 two-hour observation blocks, with 605 scan samples (each of ~2.5-min duration) being collected. Activity was divided into three categories: 'at rest', 'grooming', and 'active' (including flying off). Bats spent an average of 62% of their time 'at rest', 16% 'grooming', and 22% 'active'. Bat activity was significantly influenced by time of day, the cave chamber that was occupied, the vertical location of the bats on the cave wall, and the type of cluster formed by the bats. During the day bats spent most time 'at rest' (overall mean 78%) compared with other times (overall means 43–54%). Levels of flight and 'activity' (relative to 'at rest') were significantly lower during the day than at other times. Bats on the walls of the maternity chamber, where the temperature was highest, spent less time 'at rest' (overall mean 51%) than did bats on the walls of cooler chambers (overall means 73–86% of time). Bats in the maternity chamber spent significantly more time 'active' and 'grooming' (relative to 'at rest') than did bats in other chambers. Microclimatic conditions within the cave environment appear to significantly affect the activity of bats whilst at roost.
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9

Abbaneo, D., M. Abbas, M. Abbrescia, M. Abi Akl, O. Aboamer, D. Acosta, A. Ahmad, et al. "A novel application of Fiber Bragg Grating (FBG) sensors in MPGD." EPJ Web of Conferences 174 (2018): 03002. http://dx.doi.org/10.1051/epjconf/201817403002.

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We present a novel application of Fiber Bragg Grating (FBG) sensors in the construction and characterisation of Micro Pattern Gaseous Detector (MPGD), with particular attention to the realisation of the largest triple (Gas electron Multiplier) GEM chambers so far operated, the GE1/1 chambers of the CMS experiment at LHC. The GE1/1 CMS project consists of 144 GEM chambers of about 0.5 m2 active area each, employing three GEM foils per chamber, to be installed in the forward region of the CMS endcap during the long shutdown of LHC in 2108-2019. The large active area of each GE1/1 chamber consists of GEM foils that are mechanically stretched in order to secure their flatness and the consequent uniform performance of the GE1/1 chamber across its whole active surface. So far FBGs have been used in high energy physics mainly as high precision positioning and re-positioning sensors and as low cost, easy to mount, low space consuming temperature sensors. FBGs are also commonly used for very precise strain measurements in material studies. In this work we present a novel use of FBGs as flatness and mechanical tensioning sensors applied to the wide GEM foils of the GE1/1 chambers. A network of FBG sensors have been used to determine the optimal mechanical tension applied and to characterise the mechanical tension that should be applied to the foils. We discuss the results of the test done on a full-sized GE1/1 final prototype, the studies done to fully characterise the GEM material, how this information was used to define a standard assembly procedure and possible future developments.
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10

Bradt, J., D. Bazin, F. Abu-Nimeh, T. Ahn, Y. Ayyad, S. Beceiro Novo, L. Carpenter, et al. "Commissioning of the Active-Target Time Projection Chamber." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 875 (December 2017): 65–79. http://dx.doi.org/10.1016/j.nima.2017.09.013.

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Дисертації з теми "Active chamber"

1

Isella, Giorgio C. Culick F. "Modeling and simulation of combustion chamber and propellant dynamics and issues in active control of combustion instabilities /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-03012006-093758.

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2

Arsalane, Nabil. "Channel Emulation for active characterization of MIMO communication systems." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0069/document.

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Анотація:
Cette thèse s’inscrit dans le domaine de la caractérisation des systèmes de communication sans fil utilisant la diversité des antennes. En effet, ces systèmes permettent de lutter contre les évanouissements des signaux, lorsque le terminal est placé dans un environnement riche en multi-trajets. L’objectif d'une telle recherche est : d’étudier l'association de plusieurs antennes à l'émission et / ou la réception pour améliorer le bilan de liaison, et la capacité des systèmes sans fil, (diminution de BER (Bit Error Rate), augmentation de débit ...). Cette thèse s’intéresse à l'aspect électromagnétique et traitement du signal. Afin de comprendre les phénomènes mis en jeu, et de caractériser les performances du terminal, il doit être placé dans un environnement de propagation multi-trajets contrôlable dans le temps et dans l'espace.Cela nous amène à trouver des méthodes de mesures capables de reproduire des modèles de canaux de propagation réalistes. Dans le cadre de cette thèse la méthode utilisée est la chambre réverbérante. Dans cette thèse, nous nous intéressons à l'aspect temporel. La chambre réverbérante (RC) est considérée comme un outil utile pour émuler des environnements riches en multi-trajets. Dans cette contribution, ce dispositif est utilisé pour émuler des modèles canaux multi-trajets, et évaluer la performance des systèmes de communication sans fil. Cette évaluation est effectuée avec des mesures en temps réel et non temps réel. Parmi les objectifs de cette thèse est d'obtenir un modèle de simulation électromagnétique de la chambre réverbérante basé sur une approche circuit, afin de déterminer la fonction de transfert de canal en fonction des pertes
This thesis is part of the field of the characterization of wireless communication systems using antennas diversity. Indeed, such systems allow fighting against the signals fading, when the terminal is inside a strong multipath environment. The issue of such research is: to study the association of multiple antennas at transmitting and/or receiving sides to improve the link budget, and the capacity of wireless systems, (decrease of BER (Bit Error Rate), increase of throughput …). This thesis takes an interest to the electromagnetic aspect, and signal processing. In order to understand the involved phenomena, and to characterize the terminal performance, it should be placed in a controlled multipath propagation environment in time, and in space. This brings us to find measurement methodologies able to reproduce models of realistic propagation channels. As part of this thesis the method used is the reverberation chamber. In this thesis we are interested in the time aspect. Reverberation chamber (RC) is considered as a useful tool to emulate rich multipath environments. In this contribution, this device is employed to emulate multi clusters channel models (cluster is defined as a group of multipath), and evaluate performance of wireless communication systems. This evaluation is performed with real time and not-real time measurements. It remains to note that among the objectives set out in this PhD thesis is to obtain electromagnetic simulation model of the reverberation chamber based on circuit approach, in order to determine the channel transfer function versus losses quantities
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3

King, Laura Emily. "Development and testing of a fluorometric method and instrument based on the 2',7' dichlorodihydrofluorescin assay for the measurement of reactive oxygen species." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45943.

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An online, semi-continuous instrument to measure both total and gas phase atmospheric reactive oxygen species (ROS) and determine the concentration of ROS in the particle phase (ROS(p)) was developed. This instrument was based on a fluorescent probe for quantifying ambient ROS, specifically 2'7'-dichlorodihydrofluorescin, or DCFH probe. This probe was analyzed for sensitivity to a variety of offline and online parameters for efficient use in a field instrument. The ROS(p) instrument measures the peak light intensity at 530 nm to determine ambient ROS concentrations. ROS particles and gases are collected in a mist chamber in a nebulized mist. The instrument alternates measurements of ROS(p+g), or ROS(tot) by means of an inline filter. Fine (PM₂.₅) (ROS(p) is determined by subtraction of the ROS(g) concentration from the ROS(tot), as the ROS(g) signal could not be excluded. This instrument was tested during the summer (May-July) of 2012 at urban and rural sites in the metropolitan Atlanta and surrounding region. Concentrations of ROS(p) determined from this instrument were often below limit of detection. Average concentrations of ROS(p) were found to be 0.25 nmol/m³ in urban Atlanta (Jefferson St. and Georgia Tech), and 0.15 nmol/m³ in Yorkville, a rural site. A side by side comparison of this method with a filter collection method was made in July. The average ROS(p) offline concentrations were 0.15 nmol/m³. These concentrations were comparable to the online average concentrations of 0.21 nmol/m³ for the same period of time. This average and the majority of the measurements comprising it is dominated by the high limit of detection. The ROS instrument as constructed and operated is an efficient way to conduct ROS(p) measurements at the level of a filter study while reducing the labor intensive filter collection and extraction. In order for this instrument to be successful at measuring ambient ROS in the particle phase, the removal of the gas phase from the current sampling scheme is critical as the ROS(g) concentrations are over 90% of the measured ROS. The system as currently operable is best suited for source measurements, including biomass burning plumes or fresh exhaust to capture immediate formation.
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4

Mamadou, Godefroy Bruno. "Evaluation de l'impact des formulations pharmaceutiques sur l'absorption intestinale des molécules actives au moyen des Chambres d’Ussing." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS478/document.

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Анотація:
La connaissance des modalités d’absorption trans-épithéliale des molécules actives est un préalable indispensable à leur formulation rationnelle. Parmi les diverses méthodes in vitro disponibles, la technique de la chambre de perméation d’Ussing se distingue non seulement par une relative facilité de mise en œuvre, mais surtout la possibilité de déterminer de manière fiable les modalités de passage des molécules d'intérêt au travers de l'épithélium digestif (transport actif/passif, voies paracellulaire/transcellulaire, transports d’efflux, effets du métabolisme), ainsi que les caractéristiques électrophysiologiques et la viabilité du tissu.Nous présentons tout d'abord les principes généraux de la technique, les paramètres électriques utilisés en vue de l’interprétation des données physiologiques. Enfin, nous proposons une méthodologie pour l'évaluation du passage transmembranaire des molécules actives.La partie expérimentale du travail a eu pour objectif d'évaluer l'apport de cette approche du modèle lorsqu'il s'agit de mesurer l'impact des formulations des molécules d'intérêt (solutions, ou dispersions colloïdales) sur le flux d'absorption. Ainsi, dans un premier temps nous avons démontré pour deux molécules modèles, le paracétamol et la vitamine C, que la nature des solutions physiologiques mises en œuvre pouvaient avoir un effet important sur le fonctionnement électrophysiologique de la membrane, en modifiant notamment sa conductance, son intégrité et par voie de conséquence modifiant profondément la perméabilité transépithéliale. Dans un second temps, dans le cadre de travaux menés en collaboration, nous avons utilisé le modèle d’Ussing pour caractériser l'absorption des molécules d'intérêt lorsque celles-ci sont préalablement associées à divers systèmes colloïdaux. D'une part, nous avons ainsi montré que l'association du resvératrol, une molécule très hydrophobe, à des microémulsions permettait d'augmenter d'un facteur x6 à x11 le passage du transresvératrol par rapport au resvératrol natif. D'autre part, nous avons également montré que l'association d'une héparine de bas poids moléculaire, très hydrophile et naturellement très peu absorbée, mais associée à des nanoparticules de squalène permettait d’augmenter considérablement le flux d'absorption. En conclusion, l'ensemble de nos travaux montre l'intérêt du modèle d’Ussing lorsqu'on souhaite détailler les mécanismes physico-chimiques et biologiques par lesquels les nanoparticules sont susceptibles d'améliorer le passage digestif de molécules naturellement mal absorbées
One has to have the knowledge of the transepithelial absorption method for active molecules, as it is a necessity for rational formulation. Among various in vitro methods, the Ussing chamber technique stands out not only by its relative ease to implement, but mostly through the practical arrangements of the molecules through the digestive epithelium (active/passive transport, paracellular/transcellular, transport efflux, metabolic effects) and electrophysiological characteristics and viability of the tissue.Firstly, we will present the general principles of the technique, the electrical parameters used for the interpretation of physiological data. Eventually, we will suggest a methodology for evaluating the transmembrane passage of active molecules.The experimental part of the work is aimed to evaluate the contribution of this model approach when it comes to measuring the impact of the formulations of molecules (solutions or colloidal dispersions) on the flow of absorption.So initially we worked around with two molecule models, paracetamol and vitamin C, as the nature of physiological solutions implemented could have a significant effect on the electrophysiological function of the membrane, it could change its conductance, and therefore change its transepithelial permeability.Secondly, concerning the collaborative work, we used the Ussing model to characterize the absorption of molecules when they were previously associated with various colloidal systems. On the one hand, we have shown that the combination of resveratrol, a very hydrophobic molecule, has microemulsions which allow an increase by a factor from x6 to x11, the passage of transresveratrol compared to native resveratrol. Additionally, we also showed that the combination of heparin, a lower molecular weight, extremely hydrophilic and poorly absorbed, but when associated with squalene nanoparticles, makes it possible to significantly increase the absorption flow.As a conclusion, all our work shows through Ussing chamber model, that when one wants to detail the physico-chemical and biological mechanisms, the nanoparticles can indeed improve the digestive passage, for those molecules which are poorly absorbed naturally
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5

Lee, Jae-Yeon. "Fast and slow active control of combustion instabilities in liquid-fueled combustors." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180036/unrestricted/lee%5fjae-yeon%5f200312%5fphd.pdf.

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6

Mohanraj, Rajendran. "Modeling of combustion instabilities and their active control in a gas fueled combustor." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/12089.

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7

Сидорук, Юрій Кіндратович. "Пристрої опромінення діелектричних сипучих матеріалів електричним ВЧ та електромагнітним НВЧ полями". Doctoral thesis, Київ, 2016. https://ela.kpi.ua/handle/123456789/17770.

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Анотація:
В дисертаційній роботі розглянуто принципи побудови пристроїв опромінення діелектричних сипучих матеріалів, в тому числі зерна, електромагнітним полем НВЧ та електричним полем ВЧ, що забезпечують рівномірне опромінення сировини та високу енергетичну ефективність камери, в якій відбувається опромінення (активній камері). Детально проаналізовано активну камеру ВЧ пристрою. В НВЧ діапазоні запропоновано три варіанти побудови пристроїв, в яких вказані вище вимоги забезпечуються багаторазовим проходженням електромагнітної хвилі через шар сировини. Для забезпечення рівномірного опромінення в ВЧ діапазоні запропонована багатоелектродна камера, на циліндричній поверхні якої розташовано n електродів, що живляться гармонійною напругою. Проведено детальний аналіз напруженості і потенціалу електричного поля в відкритій комплексній області з кільцевою багатозв’язною границею з використанням теорії функцій комплексної змінної і теорії сингулярних інтегральних рівнянь. Проведено аналіз електричного поля шляхом представлення його як суми просторових гармонік. Показано, що даний підхід спрощує аналіз при оцінці зони однорідності поля. Розглянуто принцип побудови багатофазного генератора, що живить багатоелектродну структуру, принцип побудови багатоканального фазозсувача і запропоновано апарат його розрахунку.
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8

Ricquebourg, Emilie. "Etude de la réactivité et de la toxicité des particules de méthoxyphénols : analyse de leur action in vivo chez le rat en atmosphère contrôlée sur la fonction cardiaque et les paramètres du stress oxydant." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4711.

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Анотація:
De manière générale, l'inhalation de particules entraîne des réactions inflammatoires et des réactions d'oxydo-réduction responsables de la dégradation des matrices biologiques qui exercent, de plus, un fort impact cardio-vasculaire. La combustion du bois est une source majeure de composés organiques semi-volatils, parmi lesquels les méthoxyphénols (MPs), tels que le coniféryl aldéhyde (CA), le syringaldéhyde (SR), ou l'acétosyringone (AS). Les MPs sont néanmoins peu étudiés dans la littérature alors que la toxicité d'autres composés également issus de la combustion de la biomasse, tels que le monoxyde de carbone, les suies et les hydrocarbures polyaromatiques est intensivement étudiée. Ce travail a montré par GC/MS que le vieillissement en atmosphère simulée (ozone, rayonnements lumineux) dégrade le CA en produits secondaires moins cytotoxiques, évalués sur des fibroblastes en culture, mais préserve le taux atmosphérique de SR et AS, de toxicité avérée. Un dispositif original de production de MPs particulaires (Ø~50nm, N~7E4particules/cm3, m~5µg/m3) en atmosphère contrôlée a été validé et permet la 1ièreétude in vivo des MPs. L'exposition chez le rat (1-3mois) montre une modification des défenses antioxydantes et des changements cardiaques principalement avec AS, puis CA et un peu moins pour SR. Des processus adaptatifs sont démontrés après 5mois d'exposition.Par ailleurs, il a été montré in vitro sur des adénocacinomes pulmonaires A549 en culture, que le CA induit une destructuration du tapis cellulaire et l'apoptose (caspase 3) mais pas d'effet pro-inflammatoire (IL8, Cox-2). En conclusion, ce travail contribue à étudier l'impact des MPs in vitro et in vivo
In general, inhalation of particles is at the origin of inflammatory and oxidative reactions who are responsible of the degradation of biological cellular constituents, and could have a strong cardiovascular impact. The wood combustion is a major source of semivolatile organic compounds such as the methoxyphenols (MPs) including coniferyl aldehyde (CA), syringaldehyde (SR), or acetosyringone (AS). The MPs are however few studies into literature while toxicity of other compounds also from biomass combustion, as carbon monoxide, soot and polycyclic aromatic hydrocarbon are intensively studies.This work has shown by GC/MS that aging in simulated atmosphere (ozone + light rays) degraded CA in secondary products less cytotoxic, studies on fribroblastes culture but keep the atmospherical level of SR and AS which have a toxicity proved.A device of MPs particle production original by atomization, with a check system (height, composition, weight) and exposition flow continuous (Ø~50 nm, N~7E4 particles/cm3, m~5 µg/m3) adapted to little animals, was developed and validated, allowed the first study in vivo with these molecules. Between 1 and 3 month of exposition to rat Wistar, show modified antioxidant defences and cardiac modification (ischaemia/reperfusion) principally with AS, then CA and less SR. The adaptatives processes (remodeling) are demonstrated after 5 month of exposition.Furthermore, it is showed in vitro on lung adenocacinum cell lines (A549), CA induced a monolayer destructuration and apoptosis (caspase 3) but no effect proinflammatory (IL8, Cox-2 and iNOS).To conclude, this work contributes to study the impact of MPs in vitro and in vivo
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Clark, A. J. "The use of microfluidic chambers to study action potential propagation and stimulus transduction in sensory neurons in vitro." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1417511/.

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Primary afferent sensory neurons can be incredibly long single cellular structures, often traversing distances of over one metre in the human. Cutaneous sensory stimuli are transduced in the periphery by specialised end-organs or free nerve endings which enable the coding of the stimulus into electrical action potentials that propagate towards the central nervous system. Despite significant advances in our knowledge of sensory neuron physiology and ion channel expression, many commonly used techniques fail to accurately model the primary afferent neuron in its entirety. In vitro experiments often focus on the cell somata and neglect the fundamental processes of peripheral stimulus transduction and action potential propagation. Despite this, these experiments are frequently used as a model for cellular investigations of the receptive terminals. Crucially, somal responses may not represent the functional expression of ion channels in the axon and end terminals. The aim of this thesis was to develop a system using compartmentalised culture chambers and ratiometric calcium imaging to directly and accurately compare the sensitivity and functional protein expression of isolated neuronal regions in vitro. Using this preparation I demonstrate that the nerve terminals of cultured DRG neurons can be depolarised to induce action potential propagation, which has both a TTX-resistant and TTX-sensitive component. Furthermore, I show that there is a differential regulation of proton sensitivity between the sensory terminals and somata in cultured sensory neurons. I also go on to show that capsaicin sensitivity is highly dependent on embryonic dissection age. This novel approach enables a comprehensive method to study the excitability characteristics and regional sensitivity differences of cultured sensory neurons on a single cell level. Examination of the sensory terminals is crucial to further understand the properties and diversity of DRG sensory neurons.
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10

Mollex, Gaëlle. "Architecture de la plomberie du volcan carbonatitique Oldoinyo Lengai : nouvelles contraintes sur la source, les transferts hydrothermaux, et la différenciation magmatique dans la chambre active." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0123/document.

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La particularité de l’Oldoinyo Lengai à émettre des laves natrocarbonatitiques fait de ce volcan un laboratoire naturel pour l’étude de la genèse de ces magmas. De nouvelles mesures isotopiques en hélium nous ont permis de constater que la signature des fumerolles est constante depuis 1988 malgré le changement morphologique considérable du cratère sommital lors de la dernière éruption subplinienne de 2007-2008. L’alternance des éruptions explosives et effusives n’engendre donc aucune modification majeure dans l’organisation du système hydrothermal qui est par conséquent profondément enraciné. Les xénolites cogénétiques qui ont été émis lors de l’éruption de 2007-2008 permettent d’étudier directement les processus magmatiques qui se déroulent dans la chambre magmatique active. La comparaison des signatures isotopiques des gaz rares (hélium) de la chambre magmatique et des volcans silicatés de la région d’Arusha montre que les deux types de magmatisme ont une source analogue identifiée comme un manteau lithosphérique subcontinental préalablement métasomatisé par des fluides asthénosphériques. De plus, ces signatures isotopiques confirment l’absence de contaminations crustale lors de la remontée du magma entre le manteau source et la surface. Une description pétrographique de détail couplée à une approche thermobarométrique, ainsi qu’à la détermination des modèles de solubilité des volatils dans les liquides phonolitiques, nous a permis d’identifier l’évolution du liquide dans la chambre magmatique et ses paramètres de stockage. Les résultats nous révèlent que le magma injecté en 2007 a une composition phonolitique et des teneurs élevées en volatils (3.2 wt.% de H2O et 1.4 wt.% de CO2) ainsi qu’une température d'environ 1060° C. Ce magma évolue ensuite dans la chambre magmatique crustale se trouvant à 11.5±3.5 km de profondeur jusqu’à atteindre une composition de néphélinite et une température de 880°C. Pendant sa différenciation, le magma silicaté s’enrichit en calcium, sodium, magnésium et fer alors que sa concentration en silice, potassium et aluminium décroit. Ces résultats concordent avec les précédents relatifs à cette éruption, ou aux produits volcaniques plus anciens émis tout au long de la vie du volcan. Cette similarité suggère qu’aucun changement majeur n’ait eu lieu dans l’organisation de la plomberie du volcan Oldoinyo Lengai au cours de son évolution. Les mesures en éléments traces (REE, HFSE et LILE) dans les minéraux cristallisés lors de cette séquence de différenciation, et les inclusions magmatiques associées montrent un enrichissement pouvant atteindre de 100 à 1000 fois la composition du manteau primitif. Une étude expérimentale préliminaire s’appuyant sur la composition du liquide de recharge (phonolite) et les conditions (P, T) identifiées pour la chambre magmatique nous a permis de reproduire l'immiscibilité entre un liquide silicaté et carbonatitique, processus à l’origine de la formation des carbonatites de l’Oldoinyo Lengai. La poursuite de ces travaux expérimentaux permettra de mieux contraindre la genèse des magmas carbonatitiques et ainsi comprendre les processus en jeux dans l’enrichissement en éléments traces des magmas carbonatitiques
The uniqueness of Oldoinyo Lengai to emit natrocarbonatite lavas makes this volcano a natural laboratory to study the genesis of these magmas. New helium isotopic data permit to assert that the signature of the fumaroles has been constant since 1988 despite the radical morphological change of the summit crater after the last sub-Plinian eruption in 2007-2008. The alternation of the effusive and explosive eruptions does not cause major modifications in the hydrothermal system architecture, which is inferred to be deeply rooted. Cognate xenoliths that were emitted during the eruption in 2007-2008 represent a unique opportunity to document the igneous processes occurring within the active magma chamber. The comparison between the noble gas (helium) isotopic compositions of the active magma chamber and those of the other silicate volcanoes of the Arusha region indicates that both types of magmatism have similar sources, identified as being a typical sub-continental lithospheric mantle, which was previously metasomatized by asthenospheric fluids. Moreover, these isotopic signatures confirm that no crustal contamination has occurred during the magma ascent from the mantle to the surface. Detailed petrographic descriptions coupled to a thermo-barometric approach, and to the determination of volatile solubility models for a phonolite composition, allow us to identify the melt evolution at magma chamber conditions and the storage parameters. These results indicate that the magma injected in 2007 has a phonolitic composition and contains a high amount of volatiles (3.2 wt.% H2O and 1.4 wt.% CO2) as well as a temperature around 1060° C. This magma subsequently evolved in the crustal magma chamber located at 11.5 ± 3.5 km depth until reaching a nephelinite composition and a temperature of 880°C. During the differentiation in the magma chamber, the silicate magma is enriched in calcium, sodium, magnesium and iron, whereas the content of silicate, potassium and aluminum decreases. Our results support previous studies related to this eruption, and are similar to the historical products emitted during the whole volcano history, permitting the suggestion that no major modification in the plumbing system has occurred during the Oldoinyo Lengai evolution. The trace elements (REE, LILE and HFSE) measured in the minerals and melt inclusions reveal a concentration reaching 100 to 1000 times the primitive mantle composition. A preliminary experimental study based on the recharge melt composition (phonolite) and identified magma chamber conditions (P, T) permits to reproduce the immiscibility between silicate and carbonatite liquids, key processes at the origin of the Oldoinyo Lengai carbonatites. The continuation of this experimental study will lead to a better comprehension of the carbonatite genesis, thus improving our understanding of the processes that are responsible for the enrichment in trace elements
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Книги з теми "Active chamber"

1

La Chambre des communes en action. Montréal: Editions de la Chenelière, 1993.

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2

Commerce, Association of British Chambers of. Chambers of Commerce in action 1984/85: Annual review of the Association of British Chambers of Commerce. [London]: [The Association], 1985.

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Rowling, J. K. Harry Potter and the Chamber of Secrets. Vancouver: Raincoast Books, 2004.

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Rowling, J. K. Harry Potter and the Chamber of Secrets. Vancouver, Canada: Raincoast Books, 2005.

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Rowling, J. K. Harry Potter and the Chamber of Secrets. New York: Arthur A. Levine Books, 1999.

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6

Rowling, J. K. Harry Potter and the Chamber of Secrets. New York, USA: Scholastic, 2002.

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Rowling, J. K. Harry Potter and the Chamber of Secrets. Vancouver, Canada: Raincoast Books, 1999.

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8

Rowling, J. K. Harry Potter and the Chamber of Secrets. London, England: Ted Smart (Bloomsbury), 1998.

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9

Rowling, J. K. Harry Potter and the Chamber of Secrets. London, England: Bloomsbury, 2004.

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10

Rowling, J. K. Harry Potter and the Chamber of Secrets. Ontario, Canada: Scholastic Canada, 2000.

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Частини книг з теми "Active chamber"

1

Montagna, Chiara P., Paolo Papale, and Antonella Longo. "Magma Chamber Dynamics at the Campi Flegrei Caldera, Italy." In Active Volcanoes of the World, 201–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-37060-1_7.

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2

Vacca, Antonino, Marco Chiodi, Michael Bargende, André Casal Kulzer, Sebastian Bucherer, Paul Rothe, Ivica Kraljevic, Hans-Peter Kollmeier, Albert Breuer, and Helmut Ruhland. "Virtual Development of a New 3-Cylinder Natural Gas Engine with Active Pre-chamber." In Proceedings, 429–59. Wiesbaden: Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-37009-1_31.

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3

Russwurm, Tim, Michael Wensing, Lukas Euchner, and Peter Janas. "Flame Luminesce in an Optically Accessible Engine with an Active Fuelled Pre-Chamber Ignition System." In Proceedings, 397–410. Wiesbaden: Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-33521-2_27.

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4

Davydov, Roman V., Ivan K. Saveleiv, Vladimir A. Lenets, Margarita Yu Tarasenko, Tatiana R. Yalunina, Vadim V. Davydov, and Vasily Yu Rud’. "Fiber-Optic Transmission System for the Testing of Active Phased Antenna Arrays in an Anechoic Chamber." In Lecture Notes in Computer Science, 177–83. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67380-6_16.

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5

Skaper, Stephen D. "Compartmented Chambers for Studying Neurotrophic Factor Action." In Neurotrophic Factors, 213–22. Totowa, NJ: Humana Press, 2012. http://dx.doi.org/10.1007/978-1-61779-536-7_19.

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6

Hötte, Felix, Oliver Günther, Christoph von Sethe, Matthias Haupt, Peter Scholz, and Michael Rohdenburg. "Lifetime Experiments of Regeneratively Cooled Rocket Combustion Chambers and PIV Measurements in a High Aspect Ratio Cooling Duct." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 279–93. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_18.

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Abstract This paper aims at experimental investigations of the life limiting mechanisms of regeneratively cooled rocket combustion chambers, especially the so called doghouse effect. In this paper the set up of a cyclic thermo-mechanical fatigue experiment and its results are shown. This experiment has an actively cooled fatigue specimen that is mounted downstream of a subscale GOX-GCH$$_{\text {4}}$$ combustion chamber with rectangular cross section. The specimen is loaded cyclically and inspected after each cycle. The effects of roughness, the use of thermal barrier coatings, the length of the hot gas phase, the oxygen/fuel ratio and the hot gas pressure are shown. In a second experiment the flow in a generic high aspect ratio cooling duct is measured with the Particle Image Velocimetry (PIV) to characterize the basic flow. The main focus of the analysis is on the different recording and processing parameters of the PIV method. Based on this analysis a laser pulse interval and the window size for auto correlation is chosen. Also the repeatability of the measurements is demonstrated. These results are the starting point for future measurements on the roughness effect on heat transfer and pressure loss in a high aspect ratio cooling duct.
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7

Gidley, Rebecca. "The ECCC in Action, 2003–2018." In Illiberal Transitional Justice and the Extraordinary Chambers in the Courts of Cambodia, 119–55. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04783-2_5.

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8

Chen, Gang, and Lixu Gu. "A Novel Liver Perfusion Analysis Based on Active Contours and Chamfer Matching." In Lecture Notes in Computer Science, 108–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11812715_14.

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9

Eiringhaus, Daniel, Hendrik Riedmann, and Oliver Knab. "Definition and Evaluation of Advanced Rocket Thrust Chamber Demonstrator Concepts." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 407–19. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_26.

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Abstract Since the beginning of the German collaborative research center SFB-TRR 40 in 2008 ArianeGroup has been involved as industrial partner and supported the research activities with its expertise. For the final funding period ArianeGroup actively contributes to the SFB-TRR 40 with the self-financed project K4. Within project K4 virtual thrust chamber demonstrators have been defined that allow the application of the attained knowledge of the entire collaborative research center to state-of-the-art numerical benchmark cases. Furthermore, ArianeGroup uses these testcases to continue the development of its in-house spray combustion and performance analysis tool Rocflam3. Unique within the collaborative research center fully three-dimensional conjugate heat transfer computations have been performed for a full-scale 100 kN upper stage thrust chamber. The strong three-dimensionality of the temperature field in the structure resulting from injection element and cooling channel configuration is displayed.
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10

Burkardt, Patrick, Maximilian Fleischmann, Tim Wegmann, Marco Braun, Julian Knöll, Leif Schumacher, Florian vom Lehn, et al. "On the Use of Active Pre-chambers and Bio-hybrid Fuels in Internal Combustion Engines." In Energy, Environment, and Sustainability, 205–31. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-8717-4_9.

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Тези доповідей конференцій з теми "Active chamber"

1

Rothenhaeusler, Markus, and Matthias Hahn. "Active transmitters in a reverberation chamber." In 2010 Asia-Pacific International Symposium on Electromagnetic Compatibility. IEEE, 2010. http://dx.doi.org/10.1109/apemc.2010.5475675.

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Tanaka, Masafumi, and Gen Shibasawa. "Active Interruption of Solid-Propellant Combustion in a Choked Chamber." In 51st AIAA/SAE/ASEE Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-4177.

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3

Krodkiewski, Janusz M., and Gregory J. Davies. "Modelling a New Three-Pad Active Bearing." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54322.

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This paper describes investigations into a new type of active bearing to be implemented in the field of rotating machinery. Active bearings are based on the concept that journal oil flow can be modified during operation by active devices. Here, the concepts of the flexible pads and the oil-filled chambers that control their deflection are used. Three active pads are positioned around the journal with three oil-filled chambers positioned behind them. One of them, the load-bearing pad located at the bottom of the bearing, acts as a passive device and is equipped with a very thin film chamber, which acts as a source of damping. Such a damper was found in previous work to be effective in dissipating energy. Here, in a departure from previous work, two additional small pads with deep oil-filled chambers have been added in order to allow control theory to be implemented. They are located in the upper part of the active bearing. A non-linear system model is developed for the rotor-bearing system that includes the described active bearing. The flow inside the upper chambers that control motion of the active pads was neglected due to their large volume. It results in a uniform pressure distribution along the upper pads. The pressure distribution within the damper oil film (inside the lower chamber) and the journal oil film was modeled with the aid of the Reynolds equation. They were solved by means of the finite difference method and Gauss-Seidel technique. The same mesh used for solution of the Reynolds equation was used for the division of the flexible pads into the finite elements. The same approach was adopted for the modelling of the dynamic properties of the rotor. The mass and stiffness matrices for the pads and rotor were condensed down to 12 master generalized coordinates using Guyan condensation. The obtained system of matrix equations was converted to a system of first order equations and solved via the Runge-Kutta method. Some results of the numerical testing of the mathematical model developed are provided.
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4

Onofrio, Gessica, Pierpaolo Napolitano, Carmelina Abagnale, Chiara Guido, and Carlo Beatrice. "Model Development of a CNG Active Pre-chamber Fuel Injection System." In 15th International Conference on Engines & Vehicles. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-24-0090.

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5

Li, Deyu, and Jeffrey S. Vipperman. "Noise Transmission Control Studies on a Chamber Core Composite Cylinder." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33069.

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The vibroacoustic behavior and sound transmission properties of a mock-scale chamber core composite cylinder were studied, and the feasibility of the active structural acoustic control and passive control was also investigated. A box-beam model of the chamber core cylindrical shell was used for calculating the critical frequency and the ring frequency. The coupling problems between structural and acoustic modes were investigated, and the structural and acoustic modal parameters were identified from measured data. The sound transmission into the chamber core cylindrical structure was measured with and without fill materials in its wall chambers. The structural stiffness-, cavity resonance-, coincidence-, and mass-controlled zones were identified and verified.
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6

Anjos, Eduardo V. P., Marzieh SalarRahimi, Robert Rehammar, Dominique M. M. P. Schreurs, Guy A. E. Vandenbosch, and Marcel Geurts. "A 5G Active Antenna Tile and its Characterization in a Reverberation Chamber." In 2020 14th European Conference on Antennas and Propagation (EuCAP). IEEE, 2020. http://dx.doi.org/10.23919/eucap48036.2020.9135670.

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7

Bickley, A., Floyd D. McDaniel, and Barney L. Doyle. "An Active Target Time Projection Chamber for Nuclear Structure and Reactions Experiments." In APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY: Twentieth International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3120135.

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8

Ziada, Samir, and Hans R. Graf. "Active Feedback Control of Combustion Oscillations." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0127.

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Abstract Combustion oscillations are excited by a feedback mechanism which results from the coupling between the flame instability and an acoustic resonance mode of the combustion chamber. The most important event of this mechanism is believed to be the upstream feedback from the acoustic resonance to the initial region of the flame, where new disturbances are generated. A control system has been implemented into a household burner to counter act this upstream feedback. This is achieved by means of pulsating either the fresh air for combustion or the fuel. The actuators are activated by the signal of a sensor measuring the pulsation inside the combustion chamber. Combustion oscillations of this burner have been eliminated altogether, without destabilising other acoustic modes, resulting in 35 dB reduction in the amplitude of pressure pulsations.
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9

Tang, Y. Tanye, Jichul Kim, Hector Lopez-Valdes, K. C. Brennan, and Y. Sungtaek Ju. "Microfluidic chamber with active suction ports for localized chemical stimulation of brain slices." In 2010 IEEE 23rd International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2010. http://dx.doi.org/10.1109/memsys.2010.5442504.

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10

Aijaz, Naveed, Charlie Orlenius, Magnus Franzen, and Mats Andersson. "Active throughput measurements for complete MIMO WLAN systems using dual reverberation chamber technique." In International Workshop on Antenna Technology: "Small Antennas, Innovative Structures and Materials" (iWAT 2010). IEEE, 2010. http://dx.doi.org/10.1109/iwat.2010.5464757.

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Звіти організацій з теми "Active chamber"

1

Scarpitta, S. C., K. W. Tu, I. M. Fisenne, A. Cavallo, and P. Perry. Intercomparison of active, passive and continuous instruments for radon and radon progeny measurements in the EML chamber and test facility. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/505317.

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2

George, A. C., E. O. Knutson, K. W. Tu, and I. M. Fisenne. Intercomparison of active, passive and continuous instruments for radon and radon progeny measurements in the EML chamber and test facility. Office of Scientific and Technical Information (OSTI), December 1995. http://dx.doi.org/10.2172/188891.

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3

Mudge, Christopher, and Kurt Getsinger. Comparison of generic and proprietary aquatic herbicides for control of invasive vegetation; part 3 : submersed plants. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42061.

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Herbicide selection is key to efficiently managing nuisance vegetation in our nation’s waterways. After selecting the active ingredient, there still remains multiple proprietary and generic products to choose from. Recent small-scale research has been conducted to compare the efficacy of these herbicides against floating and emergent species. Therefore, a series of mesocosm and growth chamber trials were conducted to evaluate subsurface applications of the following herbicides against submersed plants: diquat versus coontail (Ceratophyllum demersum L.), hydrilla (Hydrilla verticillata L.f. Royle), southern naiad (Najas guadalupensis (Sprengel) Magnus), and Eurasian watermilfoil (Myriophyllum spicatum L.); flumioxazin versus coontail, hydrilla, and Eurasian watermilfoil; and triclopyr against Eurasian watermilfoil. All active ingredients were applied at concentrations commonly used to manage these species in public waters. Visually, all herbicides within a particular active ingredient performed similarly with regard to the onset and severity of injury symptoms throughout the trials. All trials, except diquat versus Eurasian watermilfoil, resulted in no differences in efficacy among the 14 proprietary and generic herbicides tested, and all herbicides provided 43%–100% control, regardless of active ingredient and trial. Under mesocosm and growth chamber conditions, the majority of the generic and proprietary herbicides evaluated against submersed plants provided similar control.
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Taylor, Oliver-Denzil, Amy Cunningham,, Robert Walker, Mihan McKenna, Kathryn Martin, and Pamela Kinnebrew. The behaviour of near-surface soils through ultrasonic near-surface inundation testing. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41826.

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Seismometers installed within the upper metre of the subsurface can experience significant variability in signal propagation and attenuation properties of observed arrivals due to meteorological events. For example, during rain events, both the time and frequency representations of observed seismic waveforms can be significantly altered, complicating potential automatic signal processing efforts. Historically, a lack of laboratory equipment to explicitly investigate the effects of active inundation on seismic wave properties in the near surface prevented recreation of the observed phenomena in a controlled environment. Presented herein is a new flow chamber designed specifically for near-surface seismic wave/fluid flow interaction phenomenology research, the ultrasonic near-surface inundation testing device and new vp-saturation and vs-saturation relationships due to the effects of matric suction on the soil fabric.
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Mudge, Christopher, Bradley Sartain, Kurt Getsinger, and Michael Netherland. Efficacy of florpyrauxifen-benzyl on dioecious hydrilla and hybrid water milfoil - concentration and exposure time requirements. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42062.

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This study conducted small-scale trials under various concentration and exposure time (CET) scenarios to determine florpyrauxifen-benzyl activity on dioecious hydrilla and hybrid watermilfoil and determine impact on water stargrass and elodea. Hydrilla treated with 12, 24, or 36 μg active ingredient (a.i.) L⁻¹ florpyrauxifen-benzyl and exposed for 12, 24, or 48 hr under outdoor mesocosm conditions was reduced in biomass by 30-75% at 8 weeks after treatment (WAT). An additional hydrilla trial at the same herbicide concentrations, but under longer exposures (24, 72, or 168 hr), resulted in 33–85% plant control. Under indoor conditions, hybrid watermilfoil dry weight decreased 98–100% with subsurface applications of florpyrauxifen-benzyl under CET scenarios of 3–12 μg a.i. L⁻¹ at 3–24 hr exposure times in a growth chamber trial. Under shorter exposure periods (0.5–4 hr) in a follow-up trial, low doses (3–9 μg a.i. L⁻¹) achieved 50–100% control of hybrid watermilfoil. In the same trial, the nontarget species water stargrass and elodea proved relatively tolerant to the florpyrauxifen-benzyl at doses up to 6 μg a.i. L⁻¹ (4 hr exposure) and 9 μg a.i. L⁻¹ (1 hr exposure). These small-scale trials demonstrate florpyrauxifen-benzyl’s potential to selectively manage invasive species.
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Culick, F. E. Modeling and Active Control of Nonlinear Unsteady Motions in Combustion Chambers. Fort Belvoir, VA: Defense Technical Information Center, June 1996. http://dx.doi.org/10.21236/ada310960.

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Ojha, Shekhar Nath, Suman Dey, and Suresh Chandra Babu. A bottom-up approach for a private fisheries extension system: A framework and action plan for an aqua-chamber of commerce in India. Washington, DC: International Food Policy Research Institute, 2020. http://dx.doi.org/10.2499/p15738coll2.133734.

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Boily-Auclair, É., P. Mercier-Langevin, P. S. Ross, and D. Pitre. Alteration and ore assemblages of the LaRonde Zone 5 (LZ5) deposit and Ellison mineralized zones, Doyon-Bousquet-LaRonde mining camp, Abitibi, Quebec. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329637.

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The LaRonde Zone 5 (LZ5) mine is part of the Doyon-Bousquet-LaRonde mining camp and is located in the southern part of the Abitibi greenstone belt in northwestern Quebec. The LZ5 deposit consists of three stacked mineralized corridors: Zone 4, Zone 4.1, and Zone 5. Zones 4 and 4.1 are discontinuous satellite mineralized corridors, whereas Zone 5 represents the main mineralized body. The mineralized zones of the LZ5 deposit and adjacent Ellison property (Ellison A and B zones) are hosted in the strongly-deformed, 2699-2695 Ma transitional to calcalkaline, intermediate to felsic, volcanic and volcaniclastic rocks of the Bousquet Formation upper member, which is part of the Blake River Group (2704-2695 Ma). Zones 4, 4.1, and 5 at the LZ5 mine are hosted in intermediate volcanic and volcaniclastic rocks of the Westwood andesitic to rhyodacitic unit (unit 5.1a), which forms the base of the upper member of the Bousquet Formation. The Ellison Zone A is hosted higher up in the stratigraphic sequence within a newly described intermediate volcanic unit. The Ellison Zone B is hosted in felsic volcanic and volcaniclastic rocks of the Westwood feldsparphyric rhyolite dome (subunit 5.3a-(b)). Mineralization in all three zones of the LZ5 deposit consists of discordant networks of millimeter- to centimeter-thick pyrite ±chalcopyrite ±sphalerite ±pyrrhotite veins and veinlets (10-20 % of the volume of the rock) and, to a lesser extent, very finely disseminated pyrite and boudinaged veins (less than or equal to 5 vol. % each) in strongly altered host rocks. Gold commonly occurs as microscopic inclusions in granoblastic pyrite and at the triple junction between recrystallized grains. The veins, stockworks, and disseminations were intensely folded and transposed in the steeply south-dipping, east-west trending S2 foliation. The vein network is at least partly discordant to the stratigraphy. A distal alteration halo envelops the LZ5 mineralized corridors and consists of a sericite-carbonate-chlorite- feldspar ±biotite assemblage. A proximal sericite-carbonate-chlorite-pyrite-quartz- feldspar-biotite ±epidote alteration assemblage is present within the LZ5 mineralized zones. A local proximal alteration assemblage of sericite-quartz-pyrite is also locally developed within Zone 4 and Zone 5 of the LZ5 deposit. Mass gains in Fe2O3 (t) and K2O, and mass losses in CaO, MgO, Na2O, and locally SiO2, are characteristic of the LZ5 alteration zones. The Ellison zone A and B are similar to LZ5 in terms of style of mineralization, but thin (10-20 cm) veins or bands of semi-massive to massive, finely recrystallized disseminated pyrite (0.1-1 mm) are distinctive. Chalcopyrite and sphalerite are also slightly more abundant in the mineralized corridors of the Ellison property and are usually associated with elevated gold grades. The zones are also slightly richer than at LZ5 in terms of gold and silver content, but narrower and less continuous in general. The Ellison Zone A is characterized by gains in Fe2O3 (t) and K2O and losses in CaO, MgO, Na2O, and SiO2. Gains in Fe2O3 (t) and local gains in K2O, MgO, and MnO, and losses in CO2, Na2O, P2O5, and SiO2, characterize the felsic host rocks of the Zone B corridor. The style of mineralization at LZ5 (pyrite ±chalcopyrite veins and veinlets, ±disseminated pyrite with low base metal content), its setting (i.e. in rocks of intermediate composition at the base of the upper member of the Bousquet Formation), and the geometry of its ore zones (stacked lenses of sulfide veins and veinlets, without massive sulfide lenses) differ from the other major deposits of the Doyon-Bousquet-LaRonde mining camp. Despite these differences, this study indicates that the LZ5 and Ellison mineralized corridors are of synvolcanic hydrothermal origin and have most likely been formed by convective circulation of seawater below the seafloor. An influx of magmatic fluids from the Mooshla synvolcanic intrusive complex or its parent magma chamber could explain the Au enrichment at LZ5, as has been suggested for other deposits of the camp. Evidence for a pre-deformation synvolcanic mineralization at LZ5 includes ductile deformation and recrystallization of the sulfides, the stacked nature of its ore zones, subconcordant alteration halos that envelop the mineralized corridors, evidence that the mineralized system was already active when the LZ5 lenses were deposited and control on mineralization by primary volcanic features such as the permeability and porosity of the volcanic rocks.
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