Relevant bibliographies by topics / Direct Compression Method

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Direct Compression Method'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Direct Compression Method"

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Astriani Nurjanah and Neni Nurlelah. "Formulation and Physical Evaluation of CTM Tablets by Direct Compression Method: A Systematic Literature Review." Eureka Herba Indonesia 4, no. 4 (2023): 305–9. http://dx.doi.org/10.37275/ehi.v4i4.88.

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The direct compression method is one of the well-known formulation approaches in tablet manufacture. In this method, the active ingredients and additives of the formulation are mixed together and then compressed into tablets using a special device such as a compression machine. This study is a systematic review that aims to explore the formulation and physical evaluation of CTM tablets by direct compression method. The literature search process was carried out on various databases (PubMed, Web of Sciences, EMBASE, Cochrane Libraries, and Google Scholar) regarding the formulation and physical e
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Jaiswal, Anamika, Ashok Koshta, Sapna Malviya, and Anil Kharia. "Formulation and Evaluation of Colon Targeted Matrix Tablets of Mesalazine." American Journal Of Pharmacy And Health Research 10, no. 12 (2022): 23–36. https://doi.org/10.5281/zenodo.7479322.

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ABSTRACT The present work involves the formulation of colon targeted matrix tablet of Mesalazine by using direct compression method. Excipients including in the formulation are Eudragit S100, Ethyl cellulose, Lactose, Talc, Magnesium stearate. Preformulation studies have also been performed to study the nature of API and compatibility of API with excipients by physical observation and TLC studies. The result showed that API was compatible with all the excipients selected. The tablets were formulated by direct compression method using the selected excipient quantities. The formulated tablets we
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Moselhi, Osama. "Schedule compression using the direct stiffness method." Canadian Journal of Civil Engineering 20, no. 1 (1993): 65–72. http://dx.doi.org/10.1139/l93-007.

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This paper presents a new method for critical path (CPM) scheduling that optimizes project duration in order to minimize the project total cost. In addition, the method could be used to produce constrained schedules that accommodate contractual completion dates of projects and their milestones. The proposed method is based on the well-known "direct stiffness method" for structural analysis. The method establishes a complete analogy between the structural analysis problem with imposed support settlement and that of project scheduling with imposed target completion date. The project CPM network
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Sun, Tongjing, Ji Li, and Philippe Blondel. "Direct Under-Sampling Compressive Sensing Method for Underwater Echo Signals and Physical Implementation." Applied Sciences 9, no. 21 (2019): 4596. http://dx.doi.org/10.3390/app9214596.

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Compressive sensing can guarantee the recovery accuracy of suitably constrained signals by using sampling rates much lower than the Nyquist limit. This is a leap from signal sampling to information sampling. The measurement matrix is key to implementation but limited in the acquisition systems. This article presents the critical elements of the direct under-sampling—compressive sensing (DUS–CS) method, constructing the under-sampling measurement matrix, combined with a priori information sparse representation and reconstruction, and we show how it can be physically implemented using dedicated
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Sachan, Anupam Kumar. "Comparative Study of Natural and Synthetic Superdisintegrants in Orodispersible Metformin Tablet." Asian Journal of Pharmaceutical Research and Development 7, no. 3 (2019): 46–53. http://dx.doi.org/10.22270/ajprd.v7i3.509.

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Objective: The main objective of this study is comparative study of natural and synthetic superdisintegrants in orodispersible Metformin tablet by using direct compression method and wet granulation method.
 Method: Orodispersible Metformin tablet were prepared by wet granulation method and direct compression method by using different synthetic and natural superdisintegrants. Orodispersible tablets (ODTs) have received more interest in the pharmaceutical industry for their easy to use and self medication. ODTs overcome the problem of dysphagia (difficulty in swallowing) in the all group a
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Ponnaganti, Hyma, and Kaveri Anke. "FORMULATION AND EVALUATION OF ORODISPERSIBLE TABLETS OF ACECLOFENAC BY DIRECT COMPRESSION METHOD." Journal of Advanced Scientific Research 13, no. 02 (2022): 142–48. http://dx.doi.org/10.55218/jasr.202213219.

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Nowadays, Oro dispersible tablets are gaining much importance because it is easily approachable and due to its patient compliance. In this study, Formulation and evaluation of one such tablets of Aceclofenac by direct compression method using super disintegrants like Cross carmellose sodium (CCS) was performed.
 Due to low water soluble property of aceclofenac, it has poor dissolution and bioavailability. In order to minimize this property OTD’s are prepared. ODT’s were prepared by direct compression method using super disintegrant i.e Cross Carmellose Sodium (CCS) in different concentrat
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Becque, Jurgen, Maura Lecce, and Kim J. R. Rasmussen. "The direct strength method for stainless steel compression members." Journal of Constructional Steel Research 64, no. 11 (2008): 1231–38. http://dx.doi.org/10.1016/j.jcsr.2008.07.007.

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Foks, Nathan Leon, Richard Krahenbuhl, and Yaoguo Li. "Adaptive sampling of potential-field data: A direct approach to compressive inversion." GEOPHYSICS 79, no. 1 (2014): IM1—IM9. http://dx.doi.org/10.1190/geo2013-0087.1.

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Compressive inversion uses computational algorithms that decrease the time and storage needs of a traditional inverse problem. Most compression approaches focus on the model domain, and very few, other than traditional downsampling focus on the data domain for potential-field applications. To further the compression in the data domain, a direct and practical approach to the adaptive downsampling of potential-field data for large inversion problems has been developed. The approach is formulated to significantly reduce the quantity of data in relatively smooth or quiet regions of the data set, w
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Naveed, Safila, Huma Dilshad, and Fatima Qamar. "Manufacturing of new formulation of Pyridoxine HCL by direct compression method." Journal of Scientific and Innovative Research 3, no. 4 (2014): 450–53. http://dx.doi.org/10.31254/jsir.2014.3409.

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Vitamins are widely used as a prescription medicine. The aim of the study is to prepare pyridoxine HCl tablets (200 mg) using direct compression technique which is now a days considered a cost effective and simple method of formulation. It can be considered as an appropriate method for hygroscopic and thermolabile substances. In the present study new formulations of Pyridoxine HCl was manufactured by direct compression method using Lactose, magnesium stearate. The present study is divided into two phases. In the first phase new formulation of Pyridoxine HCl was prepared by direct compression m
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Polishetty, Saipriya* Mariyam Suryaprakash Reddy SK. Irfan Khan Afshan Urooj Dr. Y. Krishna Reddy Dr.K. N. V. Rao Dr. K. Rajeswar Dutt. "FORMULATION, OPTIMIZATION AND EVALUATION OF ESLICARBAZEPINE ACETATE." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 05, no. 03 (2018): 1688–93. https://doi.org/10.5281/zenodo.1209355.

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The present study aims at developing an Eslicarbazepine fast dissolving tablet formulation for the effctive treatment of Epilepsy. To provide the patient with the most convenient mode of administration, FDT’s will dissolve quickly. A Eslicarbazepine is absorbed to atleast 90% from the gut, independently of food intake. It is quickly metabolized to esclicarbazepine. So the present work was aimed at formulating fast dissolving tablet for Eslicarbazepine, total 6 formulations were developed by using synthetic superdisintigrants like cross caramellose sodium, Crosspovidone, sodium starch gly
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Dissertations / Theses on the topic "Direct Compression Method"

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Ganesan, Karthik. "Resistance Factor for Cold-Formed Steel Compression Members." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33694.

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This research investigates if the LRFD strength reduction factor for cold-formed steel compression members can be increased above its current value of Ï c = 0.85, which was established by the LRFD Cold-Formed Steel Design Manual (1991) on the basis of 264 column tests. The resistance factor in the Canadian code for cold-formed steel compression members is also evaluated. A total of 675 concentrically loaded plain and lipped C-section columns, plain and lipped Z-section columns, hat and angle columns, including members with holes, are considered in the study. The predicted strengths are calcula
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Tamayo, Palau José María. "Multilevel adaptive cross approximation and direct evaluation method for fast and accurate discretization of electromagnetic integral equations." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/6952.

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El Método de los Momentos (MoM) ha sido ampliamente utilizado en las últimas décadas para la discretización y la solución de las formulaciones de ecuación integral que aparecen en muchos problemas electromagnéticos de antenas y dispersión. Las más utilizadas de dichas formulaciones son la Ecuación Integral de Campo Eléctrico (EFIE), la Ecuación Integral de Campo Magnético (MFIE) y la Ecuación Integral de Campo Combinada (CFIE), que no es más que una combinación lineal de las dos anteriores.<br/>Las formulaciones MFIE y CFIE son válidas únicamente para objetos cerrados y necesitan tratar la int
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Boström, Kim Joris. "Lossless quantum data compression and secure direct communication : new concepts and methods for quantum information theory /." Saarbrücken : VDM-Verl. Dr. Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3022795&prov=M&dok_var=1&dok_ext=htm.

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Falco, Aurélien. "Bridging the Gap Between H-Matrices and Sparse Direct Methods for the Solution of Large Linear Systems." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0090/document.

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De nombreux phénomènes physiques peuvent être étudiés au moyen de modélisations et de simulations numériques, courantes dans les applications scientifiques. Pour être calculable sur un ordinateur, des techniques de discrétisation appropriées doivent être considérées, conduisant souvent à un ensemble d’équations linéaires dont les caractéristiques dépendent des techniques de discrétisation. D’un côté, la méthode des éléments finis conduit généralement à des systèmes linéaires creux, tandis que les méthodes des éléments finis de frontière conduisent à des systèmes linéaires denses. La taille des
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Gerest, Matthieu. "Using Block Low-Rank compression in mixed precision for sparse direct linear solvers." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS447.

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Pour résoudre des systèmes linéaires creux de grande taille, on peut vouloir utiliser des méthodes directes, numériquement robustes, mais coûteuses en termes d'utilisation de la mémoire et de temps de résolution. C'est le cas de la méthode multifrontale, notamment implémentée par le solveur MUMPS. L’une des fonctionnalités disponibles dans ce solveur est l’utilisation de la compression Block Low-Rank (BLR), qui améliore les performances. L'objectif de cette thèse est d'explorer plusieurs pistes d'amélioration de cette compression BLR, de façon à améliorer les performances de la méthode multifr
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Gabrielsson, Jon. "Multivariate methods in tablet formulation." Doctoral thesis, Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-268.

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Maia, Wanderson Fernando. "Sobre a estabilidade de cantoneiras de aço formadas a frio submetidas à compressão." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-16052008-084426/.

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Aparentemente, a análise estrutural de uma cantoneira simples submetida à compressão constitui um problema elementar e, portanto, já largamente conhecido. Entretanto, as cantoneiras formadas a frio, em geral com paredes delgadas (elevadas relações largura/espessura), apresentam dois modos críticos de instabilidade: (i) modo global de flexão, no caso de barras longas, e um modo coincidente local-chapa/global de flexo-torção, que é crítico para barras de menor comprimento. Embora existam procedimentos simplificados de cálculo, recomendados pelas normas, a consideração do modo de flexo-torção é c
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Chodraui, Gustavo Monteiro de Barros. "Análise teórica e experimental de perfis de aço formados a frio submetidos à compressão." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-31082006-152727/.

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Os perfis de aço formados a frio apresentam, em geral, maior esbeltez local (relação largura-espessura dos elementos) em relação aos clássicos perfis laminados, acentuando a instabilidade local. Além disso, em se tratando de seções abertas com paredes muito delgadas, a rigidez à torção resulta muito pequena, o que torna os modos globais de torção e flexo-torção muitas vezes dominantes em relação aos modos de flexão. Outro modo de instabilidade que pode se manifestar é o modo distorcional, característico nos perfis com enrijecedores de borda. Com relação à análise do modo global, as normas para
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Alqarni, Ali Saeed. "Quantifying the characteristics of fine aggregate using direct and indirect test methods." Thesis, 2013. http://hdl.handle.net/2152/23598.

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The characteristics of fine aggregates, such as shape, angularity, and surface texture, have been shown to influence the performance of concrete and asphalt mixtures and to play an important role in obtaining valuable properties of early age concrete such as workability, and compatibility. However, the measurement of fine aggregate characteristics is not easy. In the present study, 26 fine aggregates, covering a wide spectrum of mineralogy, were examined using direct and indirect test methods in order to evaluate the shape, angularity, and surface texture, as well as to analyze the gradation.
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Books on the topic "Direct Compression Method"

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Boström, Kim Joris. Lossless Quantum Data Compression and Secure Direct Communication- New concepts and methods for quantum information theory. VDM Verlag Dr. Mueller e.K., 2007.

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Öztorun, Namık Kemal, and Ezgi Öztorun Köroğlu. Steel Structures I. İstanbul University–Cerrahpaşa Press Serial Number: 88, 2025. https://doi.org/10.5152/4100.

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This book provides comprehensive information essential for both the design of new steel structures and the analysis of existing ones. It covers the fundamental principles of design, procedures, historical context, specifications, and the Turkish standard TS 498 for design loads. It also addresses probability and factor of safety, the application of steel in structures, the mechanical properties of structural steels, and an introductory comments on TS 498. The book covers fundamental concepts including the behavior of tension and compression members, methods for their analysis, and details rega
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Multiphase Flow Internal Corrosion Direct Assessment (MP-ICDA) Methodology for Pipelines. AMPP, 2022. https://doi.org/10.5006/nace_sp0116-2022.

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Scope This standard practice outlines a methodology to assess pipeline integrity because of the threat internal corrosion in onshore and offshore pipelines and other piping systems that normally carry multiphase fluids (gas, water, and oil) termed multiphase flow internal corrosion direct assessment (MP-ICDA). Liquid separators (drips), compressing stations, vessels, and other equipment not related to pipelines are not included in this standard. This standard applies to pipelines, and piping systems both onshore and offshore, containing carbon dioxide (CO2), hydrogen sulfide (H2S), oxygen (O2)
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Book chapters on the topic "Direct Compression Method"

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Chan, Eng Seng, and Zhibing Zhang. "Direct Compression — Novel Method for Encapsulation of Probiotic Cells." In Fundamentals of Cell Immobilisation Biotechnology. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-017-1638-3_11.

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Coulon, Léo, Georg Koval, Cyrille Chazallon, and Jean-Noël Roux. "Numerical Modelling of Complex Modulus Tests in Direct Tension–Compression on Asphalt Concrete Using the 2D Discrete Element Method." In 14th International Conference on Asphalt Pavements ISAP2024 Montreal. Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-67252-1_73.

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Pham, Ngoc Hieu. "Effects of Hole Locations on the Elastic Global Buckling Loads of Cold-Formed Steel Channel Members with Perforations Under Compression or Bending." In Lecture Notes in Civil Engineering. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_6.

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AbstractCold-formed steel members with perforations have been commonly applied to meet the demands for technical installations. The design of the perforated members was regulated in Specification AISI S100-16 using the Direct Strength Method (DSM). This method is based on elastic buckling analyses to predict the capacities of cold-formed steel members. The determination of elastic buckling loads is compulsory for the application of the DSM method in the design and has been presented in the Specification. The specification regulations are only applied for symmetrical and evenly spaced holes. Th
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Momoh, Emmanuel Owoichoechi, Mohammad Hajsadeghi, Amila Jayasinghe, et al. "Compressive Characteristics of Perforated Re-entrant Auxetic Steel Honeycomb–Mortar Composite." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_21.

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AbstractThe possibility of achieving auxetic behaviour in conventional materials is currently attracting significant research interests in the form of auxetically enhanced cementitious composites and, especially, in re-entrant honeycomb structures. Most studies on the behaviour of re-entrant steel honeycomb auxetic reinforcement for concrete focus on achieving uniplanar auxetic behaviour perpendicular to the direction of loading. This study focuses on investigating multi-planar auxetic behaviour throughout the composite. The auxetic behaviour was achieved by perforating the steel sheets before
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Ke, Jinlin, Xiongfei Lv, and Cuncun Jiang. "Tolerance Analysis Method of Aircraft Door Sealing Structure Based on Linear Simplified Model." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_100.

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AbstractAs a moving component of the aircraft, the sealing state of the door will directly affect the aircraft's pressurization level and aerodynamic performance. The existing analysis methods of sealing structures mainly consider the compression deformation and contact stress of the seals. However, in practical engineering applications, it has been found that the sealing performance of cabin door depends on the interaction between the sealing structure and the seal. On the one hand, the tolerance fluctuation and elastic deformation of the sealing structure will cause the deviation between the
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Yenipinar, Burak, Cemal Yilmaz, Yusuf Sönmez, and Cemil Ocak. "Design Optimization and Comparison of Brushless Direct Current Motor for High Efficiency Fan, Pump and Compressor Applications." In Trends in Data Engineering Methods for Intelligent Systems. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79357-9_50.

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Hettiarachchi, Dileepa, S. M. Samindi M. K. Samarakoon, Kjell Tore Fosså, Kidane F. Gebremariam, and Mahmoud Khalifeh. "Exploring the Potential Utilization of Silicon Manganese Slag as a Supplementary Cementitious Material for Cement Replacement in Developing Low-Carbon Composite Binders." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_14.

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AbstractThe continuous increase in demand for cement in the construction industry critically contributes directly to the global carbon dioxide (CO2) emission. Hence, numerous attempts are being made to reduce CO2 emissions in conjunction with cement production, named as low-carbon cement. This has boosted the enthusiasm for searching for alternatives, specifically supplementary cementitious materials (SCM) that are considered the most environmental and economical friendly method for mitigating CO2 emissions associated with the cement-based construction industry. The purpose of this study is to
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Longo, Elia, Ennio Chiesurin, and Mario Floris. "Comparing Direct and Indirect Methods to Estimate Uniaxial Compressive Strength of Rocks Belonging to the Dolomites Sequence (NE Italian Alps)." In Applied Geology. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43953-8_9.

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Abdelgader H.S., Othman A.M., El-Baden A.S., and Angelescu N. "Concreting method that produces sustainable concrete." In Construction Materials and Structures. IOS Press, 2014. https://doi.org/10.3233/978-1-61499-466-4-127.

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For the last decades, concrete materials and technology have been widely developing in many ways in order to achieve an economic and high quality product. But from the other hand concrete offersa wide range of capabilities to achieve a good balance between human needs and earth's capacity which is known as the sustainability. Two stage concrete (TSC) known sometimes as preplaced aggregate concrete (PAC) is a relatively as a new concrete type which has ability to satisfy the requirements of performance and sustainability. Its main concept depends on pre-packing the coarse aggregates in the form
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Sukanya, M., V. Rupa Sree Devi, K. Ravi Shankar, G. Ramana Reddy, and R. Anusha. "Optimization of Telmisartan Fast Dissolving Tablets by 32 Factorial Design." In Current Trends in Drug Discovery, Development and Delivery (CTD4-2022). Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781837671090-00533.

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Telmisartan belongs to BCS Class II drug and needs enhancement in dissolution rate. The main objective of the study is to produce rapid dissolving tablets of telmisartan by complexation with β-cyclodextrin(βCD) and by using solid dispersions of MCC, Starch 1500, PEG 4000, Primojel and Mannitol. Telmisartan tablets with fast dissolution characteristics employing βCD were prepared using 32 factorial design and were prepared by direct compression method. Dissolution of Telmisartan from the βCD complexes was rapid and higher when compared to Telmisartan pure drug and with different carriers. Hence
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Conference papers on the topic "Direct Compression Method"

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Schnurr, Jonas, Momme Adami, and Mirko Skiborowski. "Refrigerant Selection and Cycle Design for Industrial Heat Pump Applications exemplified for Distillation Processes." In The 35th European Symposium on Computer Aided Process Engineering. PSE Press, 2025. https://doi.org/10.69997/sct.119494.

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Mechanical compression heat pumps are indispensable to facilitate the transition from thermally driven processes to renewable energy by electrification, upgrading low-temperature waste heat to recycle it at a higher temperature level. However, the implementation of such heat pumps up to date encounters limitations, due to equipment limitations and a lack of tools for the design of process concepts for the application of high-temperature heat pumps. The optimal design of heat pumps relies heavily on the selection of an appropriate refrigerant, as the thermodynamic properties significantly affec
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Cuervo, Bernardo, and Mark McQueen. "Corrosion under Insulation and Atmospheric Corrosion in the Refinery Industry. an Accurate Approach to Estimate Corrosion Growth Rates, a Texas Refinery Case Study." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-17751.

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Abstract Corrosion under insulation (CUI) is corrosion that results from moisture buildup on pipelines covered by insulation. Atmospheric corrosion is the electrochemical decay of a carbon steel pipeline in an air environment, under the presence of an electrolyte such as rain, dew, humidity, or snow. Salt and pollutants in the air and soil aggravate atmospheric corrosion and CUI. Both CUI and atmospheric corrosion are costly problems in refineries. In a Texas refinery, CUI causes approximately 60% of all pipe leaks and was particularly difficult to prevent, track, and mitigate. In this paper,
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Brun, Klaus, Sarah Simons, Kelsi Katcher, Ryan Cater, Brandon Ridens, and Rainer Kurz. "A Method and Apparatus for Direct Enthalpy Rise Measurement for Gas Compression." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75020.

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Gas property prediction is necessary for proper design of compressors. Equations of state are utilized to predict the thermo-physical gas properties needed for such calculations. These are semi-empirical models that allow the calculation of thermodynamic properties such as density, enthalpy, and speed of sound of gas mixtures for known pressures and temperature. Currently, there is limited or no data publically available to verify the results of these equation of state calculations for the range of pressures, temperatures and gas compositions relevant to many oil &amp; gas applications. Especi
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Hundseid, O̸yvind, and Lars E. Bakken. "Wet Gas Performance Analysis." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91035.

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The growing interest in wet gas compressors calls for accurate methods for performance prediction. Present evaluation methods for compressor and pump performance fail when evaluating the compression of gases containing liquid. Gas compression performance predictions given in ASME PTC-10-97 and ISO 5318 are based on the method John M. Schultz proposed in 1962. This method assumes a polytropic compression path and is based on averaged gas properties of inlet and outlet condition. The polytropic compression path is defined by keeping pvn constant, where n is constant along the compression path. W
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Jin, Bai, Jia Lianhui, Meng Chunxia, and Bai Fengrui. "Test and Analysis of Compression Wave Sound Velocity Measurement in Ice by Direct Method." In 2021 OES China Ocean Acoustics (COA). IEEE, 2021. http://dx.doi.org/10.1109/coa50123.2021.9519935.

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Steidel, S., J. Jahnke, X. Chang, A. Becker, and C. Vrettos. "Triaxial compression and direct shear tests in the parametrization of soil modeled via the Discrete Element Method." In 7th edition of the International Conference on Particle-based Methods. CIMNE, 2021. http://dx.doi.org/10.23967/particles.2021.013.

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Hundseid, O̸yvind, Lars E. Bakken, and Tor Helde. "A Revised Compressor Polytropic Performance Analysis." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91033.

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The compressor polytropic head and efficiency analysis are based on the assumption that the compression process follows the path of a constant polytropic exponent n. Both the ASME PTC10-97 and the ISO 5389 refer to the polytropic analysis by John M. Schultz. The procedure utilizes a head correction factor and two compressibility functions to obtain a solution of the integral Δhp = ∫vdp. Present computer technology renders possible a direct integration of the compression path where the variation in actual gas properties along the path is included. This method eliminates the averaging of gas pro
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Abdelwahab, Ahmed. "An Investigation of the Use of Wet Compression in Industrial Centrifugal Compressors." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90695.

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Industrial centrifugal compressors generally comprise a number of low pressure ratio intercooled stages. This is done primarily for the purpose of reducing the compressor power requirements and improving the operating range of the multi-stage compressor. In recent years, however, rapid increases in the per-kilowatt-hour prices both domestically and worldwide has led to renewed research efforts to further reduce the power requirements of this type of compression equipment. Several attempts have been made to use direct water injection as a means to overspray the compressor inlet to further reduc
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Danielius, R., A. Dubietis, G. Valiulis, G. Tamošauskas, and A. Piskarskas. "Nonlinear compression of tilted light pulses." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.ctui60.

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Nonlinear pulse compression under special conditions of large group-velocity mismatch (GVM) and strong energy exchange suggested for the first time 8 years ago [1,2], was demonstrated to be a simple and efficient method to generate powerful femtosecond pulses via frequency doubling of picosecond Nd-laser pulses in KDP crystal. However, the direct transfer of this technique to other wavelengths or other well-developed laser sources (Ti:sapphire, for instance) encounters serious problems related to the lack of nonlinear crystals with suitable dispersive properties. To this regard, the use of til
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Daniels, Mitchell A., Taylor Rawlings, and John P. Parmigiani. "Selection and Validation of Experimental Specimens for Determining Model Inputs for Matrix Compression Damage Propagation in Fiber Reinforced Composites." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65682.

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The matrix compression parameters in continuum damage mechanics models are often calculated from assumptions requiring detailed knowledge of fracture and frictional behavior of the material. A direct method for experimentally determining the matrix compression damage parameters would simplify the process and potentially increase accuracy of parameters. In this study, specimen geometry is determined and validated to directly evaluate the energy dissipated by matrix compression damage experimentally. Initially, candidate specimens were determined from literature on fiber compression testing incl
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Reports on the topic "Direct Compression Method"

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Sloan, Steven, Shelby Peterie, Richard Miller, Julian Ivanov, J. Schwenk, and Jason McKenna. Detecting clandestine tunnels by using near-surface seismic techniques. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40419.

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Geophysical detection of clandestine tunnels is a complex problem that has been met with limited success. Multiple methods have been applied spanning several decades, but a reliable solution has yet to be found. This report presents shallow seismic data collected at a tunnel test site representative of geologic settings found along the southwestern U.S. border. Results demonstrate the capability of using compressional wave diffraction and surface-wave backscatter techniques to detect a purpose-built subterranean tunnel. Near-surface seismic data were also collected at multiple sites in Afghani
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Baldwin, Richard. PR-015-084508-R01 Contaminants in Sales Gas Pipelines Sources Removal and Treatment. Pipeline Research Council International, Inc. (PRCI), 2010. http://dx.doi.org/10.55274/r0010029.

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The objective of this project is to provide information about a problem material found in gas pipelines called "black powder". It is a mixture or a chemical compound of iron sulfides, iron oxides, dirt, sand, salts, chlorides, water, glycols, hydrocarbons and compressor oils, mill scale, or other materials. The most common constituents, iron compounds of sulfur or oxygen, are corrosion products. In addition to chemical formation, black powder can be formed by microbes normally found in gas pipelines. This material causes machinery, measurement, and pipeline maintenance problems. This research
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ENERGY DISSIPATING MODES AND DESIGN RECOMMENDATION OF H-SHAPED STEEL BAFFLES SUBJECTED TO BOULDER IMPACT. The Hong Kong Institute of Steel Construction, 2021. http://dx.doi.org/10.18057/ijasc.2021.17.4.3.

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Flexible barriers are one of the most effective protective structures, which have been widely used for the mitigation of rockfalls. As the only compression members in a flexible barrier system, steel posts maintain the integrity of the interception structure to keep the function of the system. Due to the random trajectories of rockfalls, steel posts may be impacted by boulders directly. The impact scenario may result in the failure of the post and even the collapse of the system. In this paper, firstly, steel baffles were proposed to be an additional structural countermeasure to avoid the dire
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TESTS, MODELLING AND DESIGN OF UNSYMMETRICAL BACK-TO-BACK COLD-FORMED STEEL ANGLES UNDER COMPRESSION. The Hong Kong Institute of Steel Construction, 2024. http://dx.doi.org/10.18057/ijasc.2024.20.2.11.

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Built-up cold-formed steel (CFS) unsymmetrical angles are increasingly used in structures such as portal frames, roof trusses, and transmission towers. However, there are limited studies on CFS unequal back-to-back angle columns (BBUAC) with stiffeners. This paper presents the results of six experimental tests on intermediate BBUAC with intermittent screw fasteners. The findings include the deformed shapes at failure and the load-axial shortening behavior. Additionally, a nonlinear finite element (FE) model that accounts for both material and geometric nonlinearity was developed. The experimen
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EXPERIMENTAL STUDY ON INTERACTION OF DISTORTIONAL AND GLOBAL BUCKLING OF STAINLESS STEEL LIPPED CHANNEL COLUMNS. The Hong Kong Institute of Steel Construction, 2023. http://dx.doi.org/10.18057/ijasc.2023.19.2.7.

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This paper presents an experimental program to investigate distortional and global interaction buckling of stainless steel lipped channel columns in compression. Appropriate cross-sections and lengths were chosen so as to observe distortional-overall interaction buckling. In total, 21 buckling tests were conducted. After a brief introduction to the choice of column specimen geometries, key experimental results have been presented and discussed. The tests aim to study and observe the effect of distortional-global interactive buckling, study member under pin-ended boundary conditions, and provid
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A SURROGATE MODEL TO ESTIMATE THE AXIAL COMPRESSIVE CAPACITY OF COLD-FORMED STEEL OPEN BUILT-UP SECTIONS. The Hong Kong Institute of Steel Construction, 2022. http://dx.doi.org/10.18057/icass2020.p.316.

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This paper proposed a surrogate model to simplify the process of estimating the axial compressive capacity of cold-formed steel (CFS) open built-up sections composed of lipped channels with different section sizes, thickness, length, and connector spacing. The surrogate model was developed based on the current design methods, i.e., the Effective Width Method (EWM) and Direct Strength Method (DSM), which are codified in the North American Specification AISI S100-16. This new model features two surface regression equations with a boundary inequality criteria, anchored on two important parameters
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SECOND-ORDER DIRECT ANALYSIS FOR STEEL H-PILES ACCOUNTING FOR POST-DRIVING RESIDUAL STRESSES. The Hong Kong Institute of Steel Construction, 2022. http://dx.doi.org/10.18057/icass2020.p.349.

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"Driven steel H-piles are extensively adopted in engineering practice due to their convenience and efficiency in both economic and construction. The post-driving residual stress, a compressive axial stress distributed along the pile induced by the pile installation, might significantly deteriorate the pile bearing capacity. Thus, a large enough factor of safety is adopted in the traditional analysis to cover the influence caused by the post-driving residual stress. However, it sometimes leads to a large waste in costs and materials. Thus, the present study adopted the second-order analysis, a
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