Relevant bibliographies by topics / Fin array

Academic literature on the topic 'Fin array'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Fin array"

1

Goldstein, R. J., and S. B. Chen. "Flow and Mass Transfer Performance in Short Pin-Fin Channels with Different Fin Shapes." International Journal of Rotating Machinery 4, no. 2 (1998): 113–28. http://dx.doi.org/10.1155/s1023621x98000104.

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The mass transfer (analogous to heat transfer) and pressure loss characteristics of staggered short pin-fin arrays are investigated experimentally in the range of Reynolds number 3000 to 18,000 based on fin diameter and mean approach-flow velocity. Three different shapes of fins with aspect ratio of 2 are examined: one uniform-diameter circular fin (UDCF) and two stepped-diameter circular fins (SDCF1 and SDCF2). Flow visualization using oil-lampblack reveals complex flow characteristics associated with the repeated production of horseshoe vortices and fin wakes, and the interactions among these. The SDCF1 and SDCF2 arrays show flow characteristics different from the UDCF array due to downflow from the steps. For all arrays tested, the near-endwall flow varies row by row in the initial rows until it reaches a stable pattern after the third row. The row-averaged Sherwood numbers obtained from the naphthalene sublimation experiment also show a row-by-row variation pattern similar to the flow results. While the SDCF2 array has the highest mass transfer rate, the SDCF1 array has the smallest pressure loss at the same approach-flow velocity. The fin surfaces have higher array-averaged Sherwood number than the endwall and the ratio between these changes with fin shape and Reynolds number. The performance of the pin-fin arrays is analyzed under two different constraints: the mass[heat transfer rate at fixed pumping power, and the mass/heat transfer area and pressure loss to fulfill fixed heat load at a fixed mass flow rate. In both cases, the SDCF2 array shows the best performance.
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Chyu, M. K., Y. C. Hsing, and V. Natarajan. "Convective Heat Transfer of Cubic Fin Arrays in a Narrow Channel." Journal of Turbomachinery 120, no. 2 (April 1, 1998): 362–67. http://dx.doi.org/10.1115/1.2841414.

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The present study explores the heat transfer enhancement induced by arrays of cubic fins. The fin element is either a cube or a diamond in shape. The array configurations studied include both in-line and staggered arrays of seven rows and five columns. Both cubic arrays have the same geometric parameters, i.e., H/D = 1, S/D = X/D = 2.5, which are similar to those of earlier studies on circular pin-fin arrays. The present results indicate that the cube element in either array always yields the highest heat transfer, followed by diamond and circular pin-fin. Arrays with diamond-shaped elements generally cause the greater pressure loss than those with either cubes or pin fins. For a given element shape, a staggered array generally produces higher heat transfer enhancement and pressure loss than the corresponding inline array. Cubic arrays can be viable alternatives for pedestal cooling near a blade trailing edge.
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Bejan, A., and A. M. Morega. "Optimal Arrays of Pin Fins and Plate Fins in Laminar Forced Convection." Journal of Heat Transfer 115, no. 1 (February 1, 1993): 75–81. http://dx.doi.org/10.1115/1.2910672.

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This paper reports the optimal geometry of an array of fins that minimizes the thermal resistance between the substrate and the flow forced through the fins. The flow regime is laminar. Two fin types are considered: round pin fins, and staggered parallel-plate fins. The optimization of each array proceeds in two steps: The optimal fin thickness is selected in the first step, and the optimal thickness of the fluid channel is selected in the second. The pin-fin array is modeled as a Darcy-flow porous medium. The flow past each plate fin is in the boundary layer regime. The optimal design of each array is described in terms of dimensionless groups. It is shown that the minimum thermal resistance of plate-fin arrays is approximately half of the minimum thermal resistance of heat sinks with continuous fins and fully developed laminar flow in the channels.
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Uzol, Oguz, and Cengiz Camci. "Heat Transfer, Pressure Loss and Flow Field Measurements Downstream of Staggered Two-Row Circular and Elliptical Pin Fin Arrays." Journal of Heat Transfer 127, no. 5 (May 1, 2005): 458–71. http://dx.doi.org/10.1115/1.1860563.

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This paper presents the results of heat transfer, total pressure loss, and wake flow field measurements downstream of two-row staggered elliptical and circular pin fin arrays. Two different types of elliptical fins are tested, i.e., a Standard Elliptical Fin (SEF) and a fin that is based on NACA four digit symmetrical airfoil shapes (N fin). The results are compared to those of a corresponding circular pin fin array. The minor axis lengths for both types of elliptical fins are kept equal to the diameter of the circular fins. Experiments are performed using Liquid Crystal Thermography and total pressure probe wake surveys in a Reynolds number range of 18 000 and 86 000 as well as Particle Image Velocimetry (PIV) measurements at ReD=18 000. The pin fins had a height-to-diameter ratio of 1.5. The streamwise and the transverse spacings were equal to one circular fin diameter, i.e., S/D=X/D=2. For the circular fin array, average Nusselt numbers on the endwall within the wake are about 27% higher than those of SEF and N fin arrays. Different local heat transfer enhancement patterns are observed for elliptical and circular fins. In terms of total pressure loss, there is a substantial reduction in case of SEF and N fins. The loss levels for the circular fin are 46.5% and 59.5% higher on average than those of the SEF and N fins, respectively. An examination of the Reynolds analogy performance parameter show that the performance indices of the SEF and the N fins are 1.49 and 2.0 times higher on average than that of circular fins, respectively. The thermal performance indices show a collapse of the data, and the differences are much less evident. Nevertheless, N fins still show slightly higher thermal performance values. The wake flow field measurements show that the circular fin array creates a relatively large low momentum wake zone compared to the SEF and N fin arrays. The wake trajectories of the first row of fins in circular, SEF and N fin arrays are also different from each other. The turbulent kinetic energy levels within the wake of the circular fin array are higher than those for the SEF and the N fin arrays. The transverse variations in turbulence levels correlate well with the corresponding local heat transfer enhancement variations.
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Chyu, M. K. "Heat Transfer and Pressure Drop for Short Pin-Fin Arrays With Pin-Endwall Fillet." Journal of Heat Transfer 112, no. 4 (November 1, 1990): 926–32. http://dx.doi.org/10.1115/1.2910502.

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The effects of array configuration and pin-endwall fillet on the heat transfer and pressure drop of short pin-fin arrays are investigated experimentally. The pin-fin element with endwall fillet, typical in actual turbine cooling applications, is modeled by a spool-like cylinder. The arrays studied include an in-line and a staggered array, each having seven rows of five pins. These arrays have the same geometric parameters, i.e., H/D = 1, S/D = X/D = 2.5, and the Reynolds number ranging from 5 × 103 to 3 × 104. One of the present results shows that the staggered array always has a higher array-averaged heat transfer coefficient than its in-line counterpart. However, the pressure drop for the staggered array is higher compared to the in-line configuration. These trends are unaffected by the existence of the pin-endwall fillet. Another significant finding is that an array with pin-endwall fillet generally produces lower heat transfer coefficient and higher pressure drop than that without endwall fillet. This leads to the conclusion that pin-endwall fillet is undesirable for heat transfer augmentation. In addition, nai¨ve use of the heat transfer results obtained with perfectly circular cylinders tends to overestimate the pin-fin cooling capability in the actual turbine. The effects of endwall fillet on the array heat transfer and pressure drop are much more pronounced for the staggered array than for the inline array; however, they diminish as the Reynolds number increases.
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Wirtz, R. A., R. Sohal, and H. Wang. "Thermal Performance of Pin-Fin Fan-Sink Assemblies." Journal of Electronic Packaging 119, no. 1 (March 1, 1997): 26–31. http://dx.doi.org/10.1115/1.2792197.

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Experiments are reported on the thermal performance of model fan-sink assemblies consisting of a small axial flow fan which impinges air on a square array of pin-fins. Cylindrical, square, and diamond shape cross section pin-fins are considered. The pin-fin heat transfer coefficient is found to be maximum immediately under the fan blades and minimum below the fan hub and near the corners of the array. The overall heat sink thermal resistance, R, decreases with an increase in either applied pressure rise or fan power and fin height. At fixed applied pressure rise, R is minimized when the fin pitch-to-diameter ratiois maximum. At fixed fan power, R is minimized when the pitch-to-diameter ratio is reduced toward unity. Finally, cylindrical pin-fins give the best overall fan-sink performance.
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Shyu, Jin-Cherng, and Jhih-Zong Syu. "Plate-fin array cooling using a finger-like piezoelectric fan." Applied Thermal Engineering 62, no. 2 (January 2014): 573–80. http://dx.doi.org/10.1016/j.applthermaleng.2013.10.021.

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Jubran, B. A., M. A. Hamdan, and R. M. Abdualh. "Enhanced Heat Transfer, Missing Pin, and Optimization for Cylindrical Pin Fin Arrays." Journal of Heat Transfer 115, no. 3 (August 1, 1993): 576–83. http://dx.doi.org/10.1115/1.2910727.

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This paper reports an experimental investigation on the effects of interfin spacing, shroud clearance, and missing pin on the heat transfer from cylindrical pin fins arranged in staggered and in-line arrays. The interfin spacing in the span wise direction was so small that the pins were almost touching each other. It was found that the optimum interfin spacing in both spanwise and streamwise directions is 2.5 D regardless of both type of array and shroud clearance used. The effect of missing pin for various interfin spacing arrays was found to be negligible for the in-line array but more significant for the staggered arrays.
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Desai, Sandeep R., and Rohit V. Kengar. "Experimental analysis of fluid elastic vibrations in rotated square finned tube arrays subjected to water cross flow." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 17 (July 9, 2019): 6124–34. http://dx.doi.org/10.1177/0954406219861132.

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The majority of the failures of shell and tube heat exchanger tubes are reported due to the flow-induced vibration caused by shell side cross flow. Fluid elastic instability, vortex shedding, and turbulent buffeting are the excitation mechanisms responsible for the failure of the tubes. The failure occurs due to tube-to-tube impacts leading to impaction marks on the tube surface and, subsequently, leading to the failure due to fretting wear and fatigue. The present research work deals with the determination of critical velocity at instability for rotated square finned tube arrays subjected to water cross flow. In all, total six tube arrays are tested with two different pitch ratios, each with a plain tube array, a coarse finned tube array, and a fine finned tube array. Pitch ratios considered in the study are 2.1 and 2.6, while fin densities considered are coarse (4 fpi = 6.35 mm) and fine (10 fpi = 2.54 mm). The effect of array pattern, pitch ratio, and fin density on the onset of instability is studied by conducting experiments in the water cross flow. The effect of tube array pattern is studied by comparing the results of the present study with authors' published results for parallel triangular finned tube arrays in the water cross flow. The study led to the conclusion that the instability threshold is delayed for rotated square tube arrays compared to parallel triangular tube arrays. It is also observed that instability thresholds for coarse and fine finned tubes are delayed compared to plain tubes and is found to be more for finned tubes with higher fin densities.
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Chyu, M. K., Y. Hsing, V. Natarajan, and J. S. Chiou. "Effects of Perpendicular Flow Entry on Convective Heat/Mass Transfer From Pin-Fin Arrays." Journal of Heat Transfer 121, no. 3 (August 1, 1999): 668–74. http://dx.doi.org/10.1115/1.2826031.

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Convective heat transfer with pin-fin arrays have been studied extensively in laboratory experiments where flow is introduced to the array uniformly over the channel span. However, the flow path in actual cooling designs is often serpentine-shaped with multiple turns, and the pin-fin array section is often located immediately downstream of a turn. The present study, using an analogous mass transfer technique based on naphthalene sublimation, investigates the effects of three different, nonaxial flow entries on array heat transfer for both an inline and a staggered arrangement of pins. The measurement acquires the mass transfer rate of each individual pin in a five row by seven column array for the Reynolds number varying from 8000 to 25,000. The mass transfer and associated flow visualization results indicate that the highly nonuniform flow distribution established at the array entrance and persisting through the entire array can have significant effects on the array heat transfer characteristics. Compared to the conventional case with axial-through flow entrance, the overall array heat transfer performance can be either enhanced or degraded, depending on the actual inlet arrangements and array configurations.
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Dissertations / Theses on the topic "Fin array"

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Cowan, Jonathan B. "Investigation of Erosion and Deposition of Sand Particles within a Pin Fin Array." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35959.

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The transport of particulates within both a fully developed and developing pin fin arrays is explored using computational fluid dynamics (CFD) simulations. The simulations are carried out using the LES solver, GenIDLEST, for the fluid (carrier) phase and a Langragian approach for the particle (dispersed) phase. A grid independency study and validation case versus relevant experiments are given to lend confidence to the numerical simulations. Various Stokes numbers (0.78, 3.1 and 19.5) are explored as well as three nondimensional particle softening temperatures (θST = 0, 0.37 and 0.67). The deposition is shown to increase with decreasing particle Stokes number and thus decreasing size from 0.005% for Stp = 19.5 to 13.4% for Stp = 0.78 and is almost completely concentrated on the channel walls (99.6% - 100%). The erosion potential is shown to increase with Stokes number and is highest on the pin faces. As is to be expected, the deposition increases with decreasing softening temperature from 13.4% at θST = 0.67 to 79% for θST =0. Overall, the channel walls of the array show the greatest potential for deposition. On the other hand, the pin faces show the greatest potential for erosion. Similarly, the higher Stokes number particles have more erosion potential while the lower Stokes number particles have a higher potential for erosion.
Master of Science
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Harding, Matthew T. "An experimental investigation of the performance of staggered PIN-FIN Array laminar flow heat exchangers." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FHarding.pdf.

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Komral, Ata. "Heat transfer studies and flow visualization of a rectangular channel with an offset strip fin array." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA306675.

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Thesis (M. S. in Mechanical Engineering) Naval Postgraduate School, September 1995.
Thesis advisor(s): Matthew Kelleher. "September 1995." Includes bibliographical references. Also available online.
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Suarez, Carlos M. "Heat transfer studies and flow visualization of a rectangular channel with an offset-plate-fin array." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA311664.

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Farjam, Aslan. "Influence of Alumina Addition to Aluminum Fins for Compact Heat Exchangers Produced by Cold Spray Additive Manufacturing." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33383.

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Aluminum and aluminum-alumina powder mixtures were used to produce pyramidal fin arrays on aluminum substrates using cold spray as an additive manufacturing process. Using aluminum-alumina mixtures instead of pure aluminum powder could be seen as a cost-effective measure, preventing nozzle clogging. The fin geometries that were produced were observed using a 3D digital microscope to determine the flow passages width and fins geometric details. Heat transfer and pressure tests were carried out using different ranges of appropriate Reynolds numbers for the sought commercial application to compare each fin array and determine the effect of alumina content. It was found that the presence of alumina reduces the fins’ performance when compared to pure aluminum but that they still outperform traditional fins. Numerical simulations were performed and were used to explain the obtained experimental results. The numerical model opens up new avenues in predicting different parameters such as pressure and substrate temperature.
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Tindall, A. T. R. "Experimental and theoretical studies of convective heat transfer from fin arrays." Thesis, University of Lincoln, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354881.

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Thrift, Alan Albright. "Aerodynamic Force and Pressure Loss Measurements on Low Aspect Ratio Pin Fin Arrays." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31189.

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The desire to achieve higher heat transfer augmentation for turbine blades is fueled by the increased power output and efficiency that is achievable with high turbine inlet temperatures. The use of internal cooling channels fitted with pin fin arrays serves as one method of accomplishing this goal. Consequently, the addition of pin fin arrays comes at the expense of increased pressure drop. Therefore the pin fin geometry must be judiciously chosen to achieve the required heat transfer rate while minimizing the associated pressure drop.

This project culminates in the measurement of both pin fin force and array pressure drop as they related to changes in the array geometry. Specifically, the effects of Reynolds number, spanwise pin spacing, streamwise pin spacing, pin aspect ratio, and flow incidence angle. Direct two-component force measurement is achieved with a cantilever beam force sensor that uses highly sensitive piezoresistive strain gauges, relating the strain at the base of the beam to the applied force. With proper characterization, forces as small as one-tenth the weight of a paper clip are successfully measured. Additionally, array pressure drop measurements are achieved using static pressure taps.

Experiments were conducted over a range of Reynolds numbers between 7,500 and 35,000. Changes in the spanwise pin spacing were shown to substantially alter the pin fin drag and array pressure drop, while changes in the streamwise pin spacing were less influential. The experimental results also showed a dramatic reduction in the pin fin drag and array pressure drop for an inline flow incidence angle. Finally, changes in the pin aspect ratio were shown to have little effect on the array pressure drop.
Master of Science

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Esposito, Robert Anthony. "TURBO CODING IMPLEMENTED IN A FINE GRAINED PROGRAMABLE GATE ARRAY ARCHITECTURE." Diss., Temple University Libraries, 2009. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/26071.

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Engineering
Ph.D.
One recent method to approach the capacity of a channel is Turbo Coding. However, a major concern with the implementation of a Turbo Code is the overall complexity and real-time throughput of the digital hardware system. The salient design problem of Turbo Coding is the iterative decoder, which must perform calculations over all possible states of the trellis. Complex computations such as exponentiations, logarithms and division are explored as part of this research to compare the complexity of the traditionally avoided maximum a-posteriori probability (MAP) decoder to that of the more widely accepted and simplified Logarithm based MAP decoder (LOG-MAP). This research considers the fine grained implementation and processing of MAP, LOG-MAP and a hybrid LOG-MAP-Log Likelihood Ratio (LLR) based Turbo Codes on a Xilinx Virtex 4 PGA. Verification of the Turbo Coding system performance is demonstrated on a Xilinx Virtex 4 ML402SX evaluation board with the EDA of the Xilinx System Generator utilizing hardware co-simulation. System throughput and bit error rate (BER) are the performance metrics that are evaluated as part of this research. An efficient system throughput is predicated by the parallel design of the decoder and BER is determined by data frame size, data word length and the number of decoding iterations. Furthermore, traditional and innovative stopping rules are evaluated as part of this research to facilitate the number of iterations required during decoding.
Temple University--Theses
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Axtmann, Meriam [Verfasser]. "Investigations on Heat Transfer and Pressure Loss in Staggered Pin Fin Cooling Arrays / Meriam Axtmann." München : Verlag Dr. Hut, 2018. http://d-nb.info/1164293982/34.

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Moores, Kevin A. "Effect of tip clearance on the thermal and hydrodynamic performance of shrouded pin fin arrays." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8787.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Books on the topic "Fin array"

1

Suarez, Carlos M. Heat transfer studies and flow visualization of a rectangular channel with an offset-plate-fin array. Monterey, Calif: Naval Postgraduate School, 1996.

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Notter, Annick. Fragments d'une splendeur: Arras à la fin du Moyen Âge. Arras: Musée des beaux-arts d'Arras, 2000.

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Rings and things and a fine array of twentieth century associative algebra. Providence, R.I: American Mathmatical Society, 1999.

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Hwang, Jennie S. Ball grid array & fine pitch peripheral interconnections: A handbook of the technology & applications for microelectronics/electronics manufacturing. Isle of Man [England]: Electrochemical Publications Ltd, 1995.

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Heat Transfer Studies and Flow Visualization of a Rectangular Channel with an Offset-Plate-Fin Array. Storming Media, 1996.

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Dufseth, Rhonda. Package Application Note for Fine Pitch Ball Grid Array (FBGA). Microchip Technology Incorporated, 2016.

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1964-, Soudris Dimitrios, and Vassiliadis Stamatis, eds. Fine- and coarse-grain reconfigurable computing. [New York?]: Springer, 2007.

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Wingfield, Nancy M. The World of Prostitution in Late Imperial Austria. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198801658.001.0001.

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This book encompasses the world of prostitution in late imperial Austria. It addresses female agency and experience, contemporary fears about sexual coercion and the forced movement of girls and women, and police surveillance. Prostitution is analyzed at three different, but interlinked levels: subjectivity, society, and state. Rather than treating prostitutes solely as victims or problems to be solved, in contrast to much of the historical literature, it seeks to find the historical subjects behind fin-de-siècle constructions of prostitutes, to restore agency to the women who participated in various kinds of commercial sex, illuminate their everyday experiences, and place these women, some of whom made the reasoned economic decision to sell their bodies, in a larger social context. It investigates their interactions with the police and other supervisory agents, as well as with other inhabitants of their world, rather than focusing on the state-constructed apparatus of surveillance from the top down. Many Austrian prostitutes came from artisan and working-class, often impoverished backgrounds. They faced a complicated array of constraints that shaped the environment in which they made decisions, including lack of other economic opportunities, of education, of legal equality with men as well as legal dependence on their fathers and husbands. Despite entrenched beliefs about female sexuality and the “fallen” woman, prostitution, clandestine or regulated, was a viable choice for some women of limited economic circumstances when faced with the alternatives: low-paid, often dangerous employment in a factory, in a night café or inn, or as a servant.
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Rings And Things And A Fine Array Of Twentieth Century Associative Algebra (Mathematical Surveys and Monographs). 2nd ed. American Mathematical Society, 2004.

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(Foreword), Y. Patt, J. Smith (Foreword), M. Valero (Foreword), Stamatis Vassiliadis (Editor), and Dimitrios Soudris (Editor), eds. Fine- and Coarse-Grain Reconfigurable Computing. Springer, 2007.

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Book chapters on the topic "Fin array"

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Roy, Krishna, Biplab Das, and Subhrajit Dutta. "Natural Convective Heat Transfer from an Inclined Isothermal Fin Array." In Advances in Mechanical Engineering, 1055–68. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0124-1_94.

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Deka, Abhijit, and Dilip Datta. "A Comparative Analysis of Annular Fin Array Under Multi-objective Optimization." In Lecture Notes in Mechanical Engineering, 195–203. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9931-3_20.

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Rodgers, P., and M. Davies. "Air Velocity and Temperature Measurements Around a Naturally Convecting Rectangular Fin Array." In Thermal Management of Electronic Systems, 211–20. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1082-2_19.

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Deka, Abhijit, and Dilip Datta. "Geometric Size Optimization of Annular Step Fin Array for Heat Transfer by Natural Convection." In Nature-Inspired Methods for Metaheuristics Optimization, 385–402. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-26458-1_21.

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Davies, Harvey. "FAN — An array-oriented query language." In Lecture Notes in Computer Science, 155–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62221-7_13.

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Mobedi, M., H. Yüncü, and B. Yücel. "Natural Convection Heat Transfer from Horizontal Rectangular Fin Arrays." In Cooling of Electronic Systems, 189–202. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1090-7_10.

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Minakami, K., S. Mochizuki, A. Murata, Y. Yagi, and H. Iwasaki. "Visualization of Flow Mixing Mechanisms in Pin-Fin Arrays." In Flow Visualization VI, 504–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_88.

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Wirtz, R. A., Weiming Chen, and Dan Colban. "Convection in Arrays of Electronic Packages Containing Longitudinal Fin Heat Sinks." In Cooling of Electronic Systems, 145–63. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1090-7_7.

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Ellison, Gordon N. "Airflow II: Forced Flow in Ducts, Extrusions, and Pin Fin Arrays." In Thermal Computations for Electronics, 59–77. Second edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003029328-4.

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Ellison, Gordon N. "Forced Convective Heat Transfer II: Ducts, Extrusions, and Pin Fin Arrays." In Thermal Computations for Electronics, 111–42. Second edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003029328-7.

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Conference papers on the topic "Fin array"

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Chyu, M. K., Y. C. Hsing, and V. Natarajan. "Convective Heat Transfer of Cubic Fin Arrays in a Narrow Channel." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-201.

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The present study explores the heat transfer enhancement induced by arrays of cubic fins. The fin element is either a cube or a diamond in shape. The array configurations studied include both inline and staggered arrays of seven rows and five columns. Both cubic arrays have the same geometric parameters, i.e., H/D=1, S/D=X/D=2.5, which are similar to those of earlier studies on circular pin-fin arrays. The present results indicate that the cube element in either array always yields the highest heat transfer, followed by diamond and circular pin-fin. Arrays with diamond-shaped elements generally cause the greatest pressure loss than those with either cubes or pin fins. For a given element shape, a staggered array generally produces higher heat transfer enhancement and pressure loss than the corresponding inline array. Cubic Arrays can be viable alternatives for pedestal cooling near a blade trailing edge.
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Siw, Sin Chien, Minking K. Chyu, and Mary Anne Alvin. "Heat Transfer Enhancement of Internal Cooling Passage With Triangular and Semi-Circular Shaped Pin-Fin Arrays." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69266.

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A systematic experimental study has been conducted to explore the heat transfer behavior of triangular and semicircular shaped pin-fin arrays as compared to the circular shaped pin-fin array, that serve as a baseline case. The main advantage of using triangular and semi-circular shaped pin-fin arrays will results in reduced component weight and potentially increases in heat transfer performance. Three staggered arrays with different inter-pin spacing in both transverse and longitudinal are explored in order to determine the optimal configuration for these three dimensional element. Both semi-circular and circular shaped pin-fin arrays are based on typical inter-pin spacing of 2.5 times the pin diameter. The channel geometry (width, W = 76.2mm, height, E = 25.4mm) simulates an internal cooling passage of wide aspect ratio (3:1) in a gas turbine airfoil. All pin-fin elements are fully bridged from one endwall to the opposite endwall. The Reynolds number, based on the hydraulic diameter of the unobstructed cross-section and the mean bulk velocity, ranges from 10,000 to 25,000. The heat transfer measurement employs a hybrid liquid crystal imaging technique, which combined one-dimensional, transient conduction model and lumped heat-capacitance model. Triangular pin-fin arrays produce the highest heat transfer enhancement, while the semi-circular pin-fin array yields the lowest heat transfer enhancement. Sharp edges at each triangular pin-fin generated more wake and turbulence, resulting in more mixing, induces greater heat transfer enhancement by approximately 10%–20% as compared to the typical pin-fins of circular cross-section. More uniform heat transfer is also observed on the endwall and neighboring pin-fins in all triangular shaped pin-fin arrays. However, triangular pin-fin arrays give the highest pressure loss due to the largest induced form drag among all cases, while circular pin-fin array exhibits the lowest pressure loss.
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Muzychka, Y. S., and M. M. Yovanovich. "Modeling the f and j Characteristics of the Offset Strip Fin Array." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0974.

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Abstract New models for predicting the thermal-hydraulic characteristics of offset strip fin arrays are developed. These models are developed by combining the asymptotic behaviour for the laminar and turbulent wake regions. Models in these two regions are developed by considering the offset strip fin as an array of short ducts or channels. The proposed models are compared with published experimental data for nineteen configurations of the rectangular offset strip fin. Model predictions are within ± 20 percent for 96 percent of friction factor data and 82 percent for Colburn j factor data. Extension of the new models for offset strip fins having non-rectangular subchannels is also discussed.
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Gonzalez-Hernandez, Jose-Luis, Abel Hernandez-Guerrero, Carlos Rubio-Jimenez, and Cuauhtemoc Rubio-Arana. "Analysis of Pin-Fin Heat Sinks With an Unconventional Fin Profile." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66359.

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In this work the performance of pin-fin heat sinks having an unconventional fin profile is compared with the use of cylindrical fins. The fin profile is a sinusoidal function and a staggered array is considered. The overall thermal resistance and total pressure drop are reported for the pin-fin heat sinks. The effect of using a wave function for the fin is studied for different number of complete waves along the height of the fins and a geometric parameter defined as the ratio of the higher to the lower radius of the fins is proposed. The study is carried out for two different inlet velocities, and for two different fin densities, corresponding to 5×5 and 7×7 arrays. An entropy generation analysis for each pin fin heat sink configuration is carried out and reported. The results of the present analysis reveal that the proposed geometry has an improvement as compared to the conventional heat sinks profiles when there is a high number of waves per fin. The effect of the geometric parameters defined in this study for the thermal and hydraulic performance is identified and discussed as well.
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Cormier, Y., P. Dupuis, B. Jodoin, and A. Corbeil. "Performance of Pyramidal Fin Arrays Using Streamwise Anisotropy Material Manufactured by Cold Gas Dynamic Spray." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p1113.

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Abstract This work studies the thermal and hydrodynamic performances of pyramidal fin arrays produced using the cold spray process as an additive manufacturing process. Near-net shaped pyramidal fin arrays of various materials were manufactured (pure aluminum, pure nickel and stainless steel 304). Fin array characterization such as fin porosity level and surface roughness evaluation was performed. The nickel pyramidal fin array is shown to be rougher compared to the two other materials used in this study. The results obtained show a lower thermal efficiency for stainless steel 304 whereas the performances of the aluminum and nickel fin arrays are similar. The multi-material sample has a better thermal efficiency than stainless steel 304, which constitutes the proof of concept of using a streamwise anisotropic fin array.
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Andrews, Stephen A., and William D. E. Allan. "Design of Streamwise Stagger Within a Pin Fin Array to Minimize Pressure Loss." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66683.

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An experiment was conducted on the effects of streamwise stagger on heat transfer and pressure drop in a pin-fin array. The data were analyzed so as to highlight how stagger could be used to design a pin fin array for the lowest possible pressure loss. Design of arrays for low pressure loss is important in electronics cooling applications. They require large amounts of heat to be extracted from fixed areas, using a minimum of power to do so. This analysis found that the minimum friction factor occurred at a streamwise stagger of approximately 12% of the range between fully inline and fully staggered. By fixing the pin diameter, varying the stagger resulted in a 63% reduction in friction factor with only a 18% reduction in the Nusselt number, based on the array footprint. Additionally, it was found that for a fixed Nusselt number, the pin diameter could vary within a finite range, with decreasing diameters permitting arrays with more efficient degrees of stagger which continued to carry the required heating/cooling load.
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Uzol, Oğuz, and Cengiz Camci. "Elliptical Pin Fins as an Alternative to Circular Pin Fins for Gas Turbine Blade Cooling Applications: Part 1 — Endwall Heat Transfer and Total Pressure Loss Characteristics." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0180.

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Detailed experimental investigation of the wall heat transfer enhancement and total pressure loss characteristics for two alternative elliptical pin fin arrays is conducted and the results are compared to the conventional circular pin fin arrays. Two different elliptical pin fin geometries with different major axis lengths are tested, both having a minor axis length equal to the circular fin diameter and positioned at zero degrees angle of attack to the free stream flow. The major axis lengths for the two elliptical fins are 1.67 and 2.5 times the circular fin diameter, respectively. The pin fin arrays with H/D = 1.5 are positioned in a staggered 2 row configuration with 3 fins in the first row and 2 fins in the second row with S/D = X/D = 2. Endwall heat transfer and total pressure loss measurements are performed two diameter downstream of the pin fin arrays (X/D = 2) in a rectangular cross-section tunnel with an aspect ratio of 4.8 and for varying Reynolds numbers between 10000 and 47000 based on the inlet velocity and the fin diameter. Liquid Crystal Thermography is used for the measurement of convective heat transfer coefficient distributions on the endwall inside the wake. The results show that the wall heat transfer enhancement capability of the circular pin fin array is about 25–30% higher than the elliptical pin fin arrays in average. However in terms of total pressure loss, the circular pin fin arrays generate 100–200% more pressure loss than the elliptical pin fin arrays. This makes the elliptical fin arrays very promising cooling devices as an alternative to conventional circular pin fin arrays used in gas turbine blade cooling applications.
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Frear, Colton, Gerardo Carbajal, and Edwar Romero. "Comparison of Micro Fin Array Configurations for Heat Transfer Enhancement in Microchannels." In ASME 2022 Heat Transfer Summer Conference collocated with the ASME 2022 16th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/ht2022-85752.

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Abstract An experimental study was conducted to compare several different micro fin array configurations to determine which channel design allows for maximum heat transfer for the largest range of flow conditions. The fin configurations were tested on novel microchannel cooling devices to measure their effectiveness. Three array configurations were tested: a dummy channel, a straight channel, and a hybrid channel. The baseline of which is a simple linear fin array that has previously proven to be effective. The second is a segmented design, in which the arrays of fins are part of a larger array of diamond-shaped segments. The final design is a hybrid between the first two configurations, resembling the straight fin design but cut into larger segments diagonally. A custom cover was made to allow measurements for temperature and pressure to be made at the inlet and outlet of the channel while not impeding the mass flux through the system. Using a scanning electron microscope (SEM), it was found that the average hydraulic diameter of each channel is 155 microns. Each cooling device was tested under a range of flowrate and heat inputs. The temperature change and pressure drop were calculated using temperature and pressure data from the inlet and outlet. This information, along with the mass flux, allows for a wide range of comparisons to be made between configurations. The experimental results revealed that, for single-phase flow, the original segmented fin configuration is the most effective. However, it is believed that the disruptive geometry of the segmented channel will allow for much greater flow mixing for all flow rates. Thus, allowing the design to perform well under a broader range of conditions. It was found during this experiment that the segmented channel design outperformed both the straight fin channel and the dummy channel.
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Chikurde, R. C., B. S. Kothavale, and N. K. Sane. "Natural Convection Heat Transfer With Horizontal Rectangular Fin Array Using Straight Knurling Patterns on Fins: An Experimental Study." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86449.

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Natural Convection heat transfer from horizontal rectangular fin array with various knurling patterns is studied experimentally to find the effect of varying surface roughness on the heat transfer rate. The experimental parametric study is performed to investigate the effect of knurl produced surface roughness of fin on heat transfer rate. The parameters like knurling height from base, knurling depth and fin spacing might affect the flow characteristics and hence it is investigated to find the effect on heat transfer coefficient. The knurling is usually accomplished using one or more very hard rollers that contain the reverse of the pattern to be imposed. The result of this study shows that there are some important geometric factors related to knurling affecting the design of fin arrays and also heat transfer augmentation of natural convection heat transfer is observed.
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Ostanek, Jason K., and Karen A. Thole. "Effects of Non-Uniform Streamwise Spacing in Low Aspect Ratio Pin Fin Arrays." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95889.

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Pin fin arrays are commonly used to cool the trailing edge of gas turbine airfoils. While the majority of pin fin research focuses on uniformly-spaced arrays, the goal of the present work was to determine if non-uniform spacing in the streamwise direction could be utilized to maintain high heat transfer while simultaneously extending the array footprint. The uniqueness of the work lies in the basis for selecting the non-uniform spacing pattern. The non-uniform arrangement was chosen to exploit previously published row-by-row heat transfer development where the initial rows showed little variation with streamwise spacing. As such, a non-uniform array was considered where the initial rows had spacing of 3.46 diameters and the inner rows gradually decreased to a final spacing of 1.73 diameters. Three seven-row arrays were considered having constant streamwise spacing of 2.16, 2.60, and 3.03 pin fin diameters. All configurations had constant spanwise spacing of two diameters and constant pin height of one diameter. Three Reynolds numbers of 3.0e3, 1.0e4, and 2.0e4 were considered based on pin fin diameter and minimum area velocity. At high Reynolds numbers, heat transfer and pressure drop measurements were in agreement for the nonuniform array and for a closely spaced array having 2.16 diameter streamwise spacing. While array performance was similar, the non-uniform array covered 16.8% more streamwise distance than the closely spaced array. At low Reynolds numbers, however, the non-uniform array was outperformed by the closely spaced array.
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Reports on the topic "Fin array"

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Lin, Lanchao. Thermal Management Research for Power Generation. Delivery Order 0002 - Volume 1: Plain Fin Array Cooler for Electronics Cooling. Fort Belvoir, VA: Defense Technical Information Center, December 2002. http://dx.doi.org/10.21236/ada413410.

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Sherman, Amir, Rebecca Grumet, Ron Ophir, Nurit Katzir, and Yiqun Weng. Whole genome approach for genetic analysis in cucumber: Fruit size as a test case. United States Department of Agriculture, December 2013. http://dx.doi.org/10.32747/2013.7594399.bard.

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The Cucurbitaceae family includes a broad array of economically and nutritionally important crop species that are consumed as vegetables, staple starches and desserts. Fruit of these species, and types within species, exhibit extensive diversity as evidenced by variation in size, shape, color, flavor, and others. Fruit size and shape are critical quality determinants that delineate uses and market classes and are key traits under selection in breeding programs. However, the underlying genetic bases for variation in fruit size remain to be determined. A few species the Cucurbitaceae family were sequenced during the time of this project (cucumber was already sequenced when the project started watermelon and melon sequence became available during the project) but functional genomic tools are still missing. This research program had three major goals: 1. Develop whole genome cucumber and melon SNP arrays. 2. Develop and characterize cucumber populations segregating for fruit size. 3. Combine genomic tools, segregating populations, and phenotypic characterization to identify loci associated with fruit size. As suggested by the reviewers the work concentrated mostly in cucumber and not both in cucumber and melon. In order to develop a SNP (single nucleotide polymorphism) array for cucumber, available and newly generated sequence from two cucumber cultivars with extreme differences in shape and size, pickling GY14 and Chinese long 9930, were analyzed for variation (SNPs). A large set of high quality SNPs was discovered between the two parents of the RILs population (GY14 and 9930) and used to design a custom SNP array with 35000 SNPs using Agilent technology. The array was validated using 9930, Gy14 and F1 progeny of the two parents. Several mapping populations were developed for linkage mapping of quantitative trait loci (QTL) for fruit size These includes 145 F3 families and 150 recombinant inbred line (RILs F7 or F8 (Gy14 X 9930) and third population contained 450 F2 plants from a cross between Gy14 and a wild plant from India. The main population that was used in this study is the RILs population of Gy14 X 9930. Phenotypic and morphological analyses of 9930, Gy14, and their segregating F2 and RIL progeny indicated that several, likely independent, factors influence cucumber fruit size and shape, including factors that act both pre-anthesis and post-pollination. These include: amount, rate, duration, and plane of cell division pre- and post-anthesis and orientation of cell expansion. Analysis of F2 and RIL progeny indicated that factors influencing fruit length were largely determined pre-anthesis, while fruit diameter was more strongly influenced by environment and growth factors post-anthesis. These results suggest involvement of multiple genetically segregating factors expected to map independently onto the cucumber genome. Using the SNP array and the phenotypic data two major QTLs for fruit size of cucumber were mapped in very high accuracy (around 300 Kb) with large set of markers that should facilitate identification and cloning of major genes that contribute to fruit size in cucumber. In addition, a highly accurate haplotype map of all RILS was created to allow fine mapping of other traits segregating in this population. A detailed cucumber genetic map with 6000 markers was also established (currently the most detailed genetic map of cucumber). The integration of genetics physiology and genomic approaches in this project yielded new major infrastructure tools that can be used for understanding fruit size and many other traits of importance in cucumber. The SNP array and genetic population with an ultra-fine map can be used for future breeding efforts, high resolution mapping and cloning of traits of interest that segregate in this population. The genetic map that was developed can be used for other breeding efforts in other populations. The study of fruit development that was done during this project will be important in dissecting function of genes that that contribute to the fruit size QTLs. The SNP array can be used as tool for mapping different traits in cucumber. The development of the tools and knowledge will thus promote genetic improvement of cucumber and related cucurbits.
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Piercey, S. J., and J. L. Pilote. Nd-Hf isotope geochemistry and lithogeochemistry of the Rambler Rhyolite, Ming VMS deposit, Baie Verte Peninsula, Newfoundland: evidence for slab melting and implications for VMS localization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328988.

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New high precision lithogeochemistry and Nd and Hf isotopic data were collected on felsic rocks of the Rambler Rhyolite formation from the Ming volcanogenic massive sulphide (VMS) deposit, Baie Verte Peninsula, Newfoundland. The Rambler Rhyolite formation consists of intermediate to felsic volcanic and volcaniclastic rocks with U-shaped primitive mantle normalized trace element patterns with negative Nb anomalies, light rare earth element-enrichment (high La/Sm), and distinctively positive Zr and Hf anomalies relative to surrounding middle rare earth elements (high Zr-Hf/Sm). The Rambler Rhyolite samples have epsilon-Ndt = -2.5 to -1.1 and epsilon-Hft = +3.6 to +6.6; depleted mantle model ages are TDM(Nd) = 1.3-1.5 Ga and TDM(Hf) = 0.9-1.1Ga. The decoupling of the Nd and Hf isotopic data is reflected in epsilon-Hft isotopic data that lies above the mantle array in epsilon-Ndt -epsilon-Hft space with positive ?epsilon-Hft values (+2.3 to +6.2). These Hf-Nd isotopic attributes, and high Zr-Hf/Sm and U-shaped trace element patterns, are consistent with these rocks having formed as slab melts, consistent with previous studies. The association of these slab melt rocks with Au-bearing VMS mineralization, and their FI-FII trace element signatures that are similar to rhyolites in Au-rich VMS deposits in other belts (e.g., Abitibi), suggests that assuming that FI-FII felsic rocks are less prospective is invalid and highlights the importance of having an integrated, full understanding of the tectono-magmatic history of a given belt before assigning whether or not it is prospective for VMS mineralization.
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Vonk, Jaynie. Sustainable Water and Sanitation in Zambia: Impact evaluation of the 'Urban WASH' project. Oxfam GB, February 2021. http://dx.doi.org/10.21201/2021.7284.

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The ‘Urban WASH' project was implemented in George and Chawama compounds in Lusaka between July 2013 and June 2017 by Oxfam and Village Water Zambia. The project aimed to improve provision and sustainable management of WASH services by engaging citizens to hold duty bearers and service providers to account. Oxfam collaborated with local institutions on an array of activities, engaging stakeholders to create a conducive environment for service provision and improving capacities and practices. This Effectiveness Review evaluates the success of this project to increase the sustainability of water and sanitation systems and services. Using a quasi-experimental evaluation design, we assessed impact among households in the intervention communities and in a comparison community. We combined the household-level quantitative assessment with analysis of community-level qualitative Key Informant Interviews, carried out with relevant institutional representatives. Find out more by reading the full report now.
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Crawford, Susan L., Anthony D. Cinson, Paul J. MacFarlan, Brady D. Hanson, and Royce Mathews. Ultrasonic Phased Array Assessment of the Interference Fit and Leak Path of the North Anna Unit 2 Control Rod Drive Mechanism Nozzle 63 with Destructive Validation. Office of Scientific and Technical Information (OSTI), August 2012. http://dx.doi.org/10.2172/1054054.

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Dalay, Satinder, Kathleen Ferguson, Sally El-Ghazali, Katy Miller, Felicity Corcoran, Matthew Tuck, Jessica Wiggins, Hannah Theobald, and Elizabeth H. Shewry. Trainee Handbook 2021. Association of Anaesthetists, July 2021. http://dx.doi.org/10.21466/g.th2.2021.

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I am delighted to welcome you to the 13th edition of the Association of Anaesthetists’ Trainee Handbook. The main objective of the handbook is to offer trainees a comprehensive resource as you navigate your way through your career. A vast array of high-quality authors have been commissioned to write about their specialist field or area of knowledge. Whatever path you choose to take, I believe you will find useful sections within this handbook. Training within anaesthesia is constantly evolving. As I write this foreword, a new training curriculum is being implemented. To reflect the changes ahead, this handbook is not only fully interactive but also a live document. Thus, it will be updated at regular intervals to ensure information remains accurate and relevant. Although this handbook is designed for you to dip in and out of, I strongly encourage you to read the chapters about taking care of yourself. Training is a challenging time, but here at the Association of Anaesthetists we are dedicated to supporting our trainee members. I would like to personally thank all the authors who contributed to this handbook. A special mention of thanks to my fellow Trainee Committee members, Sally El-Ghazali and Rhys Clyburn, as well as the countless Association staff who have made this publication possible. I welcome any feedback you may have, therefore please feel free to contact the Trainee Committee via email trainees@anaesthetists.org or Twitter @Anaes_Trainees Finally, good luck in your career – I hope this handbook helps you along the way! Satinder Dalay Elected Member, Association of Anaesthetists Trainee Co
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Bano, Masooda. The Missing Link: Low-Fee Private Tuition and Education Options for the Poor – The Demand-Side Dynamics in Pakistan. Research on Improving Systems of Education (RISE), September 2022. http://dx.doi.org/10.35489/bsg-risewp_2022/113.

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Low-fee private schools are today recognised as important players in the education market in developing countries, as they are argued to provide at least marginally better education than is on offer in the state schools. Leading international development agencies have begun encouraging governments in developing countries to include them within the policy-planning process. Based on fieldwork in two urban neighbourhoods in Pakistan, this paper shows that low-income parents are keen to secure good-quality education for their children, but they have to choose not only between state schools and low-fee private schools but also from among an array of low-fee tuition providers in their immediate neighbourhood to ensure that the child can cope in class, complete daily homework assignments, and pass exams in order to transition to the next grade. The evidence presented in this paper suggests that whether their child is enrolled in a state school or in a low-fee private school, the parents’ dependence on low-fee tuition providers is absolute: without their services, the child will not progress through the primary grades. Yet the sector remains entirely under-researched. The paper argues for the need to map the scale of this sector, document the household spending on it, and bring it within policy debates, placing it alongside low-fee private schools and state schools in order to provide access to primary education to all and improve the quality of education. At the same time it complicates the existing debates on low-fee private schools, by showing that parents on very low incomes — in this case households where mothers are employed as domestic workers and fathers are in casual employment — find them inaccessible; it also shows that household spending on education needs to take into account not just the charges imposed by low-fee schools, but also the cost of securing religious education, which is equally valued by the parents and is not free, and also the cost of paying the low-fee tuition provider. When all these costs are taken into account, the concerns that low-fee private schools are not truly accessible to the poor gain further traction. The paper also shows that mothers end up bearing the primary burden, having to work to cover the costs of their children’s education, because the core income provided by the father can barely cover the household costs.
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Kirchhoff, Helmut, and Ziv Reich. Protection of the photosynthetic apparatus during desiccation in resurrection plants. United States Department of Agriculture, February 2014. http://dx.doi.org/10.32747/2014.7699861.bard.

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In this project, we studied the photosynthetic apparatus during dehydration and rehydration of the homoiochlorophyllous resurrection plant Craterostigmapumilum (retains most of the photosynthetic components during desiccation). Resurrection plants have the remarkable capability to withstand desiccation, being able to revive after prolonged severe water deficit in a few days upon rehydration. Homoiochlorophyllous resurrection plants are very efficient in protecting the photosynthetic machinery against damage by reactive oxygen production under drought. The main purpose of this BARD project was to unravel these largely unknown protection strategies for C. pumilum. In detail, the specific objectives were: (1) To determine the distribution and local organization of photosynthetic protein complexes and formation of inverted hexagonal phases within the thylakoid membranes at different dehydration/rehydration states. (2) To determine the 3D structure and characterize the geometry, topology, and mechanics of the thylakoid network at the different states. (3) Generation of molecular models for thylakoids at the different states and study the implications for diffusion within the thylakoid lumen. (4) Characterization of inter-system electron transport, quantum efficiencies, photosystem antenna sizes and distribution, NPQ, and photoinhibition at different hydration states. (5) Measuring the partition of photosynthetic reducing equivalents between the Calvin cycle, photorespiration, and the water-water cycle. At the beginning of the project, we decided to use C. pumilum instead of C. wilmsii because the former species was available from our collaborator Dr. Farrant. In addition to the original two dehydration states (40 relative water content=RWC and 5% RWC), we characterized a third state (15-20%) because some interesting changes occurs at this RWC. Furthermore, it was not possible to detect D1 protein levels by Western blot analysis because antibodies against other higher plants failed to detect D1 in C. pumilum. We developed growth conditions that allow reproducible generation of different dehydration and rehydration states for C. pumilum. Furthermore, advanced spectroscopy and microscopy for C. pumilum were established to obtain a detailed picture of structural and functional changes of the photosynthetic apparatus in different hydrated states. Main findings of our study are: 1. Anthocyan accumulation during desiccation alleviates the light pressure within the leaves (Fig. 1). 2. During desiccation, stomatal closure leads to drastic reductions in CO2 fixation and photorespiration. We could not identify alternative electron sinks as a solution to reduce ROS production. 3. On the supramolecular level, semicrystalline protein arrays were identified in thylakoid membranes in the desiccated state (see Fig. 3). On the electron transport level, a specific series of shut downs occur (summarized in Fig. 2). The main events include: Early shutdown of the ATPase activity, cessation of electron transport between cyt. bf complex and PSI (can reduce ROS formation at PSI); at higher dehydration levels uncoupling of LHCII from PSII and cessation of electron flow from PSII accompanied by crystal formation. The later could severe as a swift PSII reservoir during rehydration. The specific order of events in the course of dehydration and rehydration discovered in this project is indicative for regulated structural transitions specifically realized in resurrection plants. This detailed knowledge can serve as an interesting starting point for rationale genetic engineering of drought-tolerant crops.
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Kwesiga, Victoria, Zita Ekeocha, Stephen Robert Byrn, and Kari L. Clase. Compliance to GMP guidelines for Herbal Manufacturers in East Africa: A Position Paper. Purdue University, November 2021. http://dx.doi.org/10.5703/1288284317428.

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With the global increase in the use of traditional and complementary remedies for the prevention and treatment of illness, the quality and safety of these medicines have become a significant concern for all regulatory authorities. Herbal medicines are the most commonly used form of traditional and complementary medicines in the world and the efficacy and safety of herbal medicines, like conventional medicines, largely depends on their quality from planting to harvesting, preprocessing and final processing. Due to the inherent complexity of herbal medicines, often containing an array of active compounds, the primary processing of herbal medicines has a direct influence on their quality. Quality concerns are the reason why the medicines regulatory agencies insist that manufacturers of medicines strictly follow Good Manufacturing Practices since it is an essential tool to prevent instances of contamination, mix-ups, deviations, failures and errors. However, a strict application of GMP requirements is expensive and would drive the prices of the manufactured products up. As a result, a maturity level grading of facilities is proposed as a way of justifying the costs incurred for manufacturers desiring to reach a broader market and investing in continuous improvement. 36 Good Manufacturing Practice (GMP) inspection reports of local herbal manufacturers conducted by National Drug Authority were analyzed to establish the type and extent of deficiencies to GMP requirements for local herbal manufacturers in Uganda. The different GMP chapters and related sub-parameters constituted the variables used for the analysis of conformity to requirements. The primary outcome variable was the conclusion regarding compliance or noncompliance of the inspected local herbal manufacturing facility. GMP parameters that were frequently defaulted by local herbal manufacturers and the corresponding frequencies were identified. The Pearson Chi-square test was applied independently on each category to find the association that existed between conformity and the questions in each category. Only 22% (8) of the 30 inspected facilities were found to comply with GMP requirements, as per National Drug Authority (NDA) guidelines; while the majority of the facilities, 28 (78%), were found not to comply. Of the facilities inspected, 25 were undergoing GMP inspection for the first time. A total of 1,236 deficiency observations were made in the 36 inspection reports reviewed for the study. The mean for all deficiencies was 34.3, and the standard deviation was 15.829. 91.5% of the facilities did not have mechanisms for a record of market complaints; 80.9% did not meet documentation requirements; 78.9% did not have quality control measures in place, and 65.7% did not meet stores requirements. By encouraging a culture of self/voluntary improvement through the introduction of listing of manufacturers based on a maturity level grading, the National Drug Authority will improve the Herbal Medicines sector as per the mandate of improving the herbal medicine industry. Also, increased sensitization of all relevant stakeholders regarding the requirements for GMP should be intensified.
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Phillips, Jake. Understanding the impact of inspection on probation. Sheffield Hallam University, 2021. http://dx.doi.org/10.7190/shu.hkcij.05.2021.

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This research sought to understand the impact of probation inspection on probation policy, practice and practitioners. This important but neglected area of study has significant ramifications because the Her Majesty’s Inspectorate of Probation has considerable power to influence policy through its inspection regime and research activities. The study utilised a mixed methodological approach comprising observations of inspections and interviews with people who work in probation, the Inspectorate and external stakeholders. In total, 77 people were interviewed or took part in focus groups. Probation practitioners, managers and leaders were interviewed in the weeks after an inspection to find out how they experienced the process of inspection. Staff at HMI Probation were interviewed to understand what inspection is for and how it works. External stakeholders representing people from the voluntary sector, politics and other non-departmental bodies were interviewed to find out how they used the work of inspection in their own roles. Finally, leaders within the National Probation Service and Her Majesty’s Prisons and Probation Service were interviewed to see how inspection impacts on policy more broadly. The data were analysed thematically with five key themes being identified. Overall, participants were positive about the way inspection is carried out in the field of probation. The main findings are: 1. Inspection places a burden on practitioners and organisations. Practitioners talked about the anxiety that a looming inspection created and how management teams created additional pressures which were hard to cope with on top of already high workloads. Staff responsible for managing the inspection and with leadership positions talked about the amount of time the process of inspection took up. Importantly, inspection was seen to take people away from their day jobs and meant other priorities were side-lined, even if temporarily. However, the case interviews that practitioners take part in were seen as incredibly valuable exercises which gave staff the opportunity to reflect on their practice and receive positive feedback and validation for their work. 2. Providers said that the findings and conclusions from inspections were often accurate and, to some extent, unsurprising. However, they sometimes find it difficult to implement recommendations due to reports failing to take context into account. Negative reports have a serious impact on staff morale, especially for CRCs and there was concern about the impact of negative findings on a provider’s reputation. 3. External stakeholders value the work of the Inspectorate. The Inspectorate is seen to generate highly valid and meaningful data which stakeholders can use in their own roles. This can include pushing for policy reform or holding government to account from different perspectives. In particular, thematic inspections were seen to be useful here. 4. The regulatory landscape in probation is complex with an array of actors working to hold providers to account. When compared to other forms of regulation such as audit or contract management the Inspectorate was perceived positively due to its methodological approach as well as the way it reflects the values of probation itself. 5. Overall, the inspectorate appears to garner considerable legitimacy from those it inspects. This should, in theory, support the way it can impact on policy and practice. There are some areas for development here though such as more engagement with service users. While recognising that the Inspectorate has made a concerted effort to do this in the last two years participants all felt that more needs to be done to increase that trust between the inspectorate and service users. Overall, the Inspectorate was seen to be independent and 3 impartial although this belief was less prevalent amongst people in CRCs who argued that the Inspectorate has been biased towards supporting its own arguments around reversing the now failed policy of Transforming Rehabilitation. There was some debate amongst participants about how the Inspectorate could, or should, enforce compliance with its recommendations although most people were happy with the primarily relational way of encouraging compliance with sanctions for non-compliance being considered relatively unnecessary. To conclude, the work of the Inspectorate has a significant impact on probation policy, practice and practitioners. The majority of participants were positive about the process of inspection and the Inspectorate more broadly, notwithstanding some of the issues raised in the findings. There are some developments which the Inspectorate could consider to reduce the burden inspection places on providers and practitioners and enhance its impact such as amending the frequency of inspection, improving the feedback given to practitioners and providing more localised feedback, and working to reduce or limit perceptions of bias amongst people in CRCs. The Inspectorate could also do more to capture the impact it has on providers and practitioners – both positive and negative - through existing procedures that are in place such as post-case interview surveys and tracking the implementation of recommendations.
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