Academic literature on the topic 'Minitab 18'
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Journal articles on the topic "Minitab 18"
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Golubev, A. N., T. Sh Nguyen, A. V. Basevich, et al. "Approaches to the Development of Drugs with the Use of Modern Statistical Software Concepts and Quality-by-Design." Drug development & registration 8, no. 3 (2019): 45–48. http://dx.doi.org/10.33380/2305-2066-2019-8-3-45-48.
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Introduction. The development of the composition of drugs is very difficult and long process. To implement it, it is currently recommended to apply a modern approach – quality through the development of Quality by design. One of the methods for introducing this approach is the use of multifactorial experiments.Aim. The aim of the work was to develop the composition and technology of effervescent tablets using the Minitab program.Materials and methods. For the study used the program Minitab (ver. 18.), Minitab LLC, USA. The program created an experiment plan and evaluated those obtained on the basis of its models using regression analysis.Results and discussion. The composition and technology of effervescent tablets was developed by direct compression using the principles of Quality by design. Algorithms of actions for using the Minitab software package for development are proposed. An experiment plan was constructed and models of the dependence of quality indicators on the composition and technological parameters were generated. The resulting sub-sections were analyzed using regression analysis tools.Conclusion. Based on the results of the work, the composition of effervescent tablets obtained by direct compression technology, as well as the algorithm of drug development in the Minitab program, was proposed.
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AlSarji, Ali Hussine, Shurooq Talib Al-Humairi, Riyadh Sadeq AlMukhtar, Saja Mohsen Alardhi, Mohamed Sulyman, and I. M. R. Fattah. "Response surface methodology approach for optimization of biosorption process for removal of Hg(II) ions by immobilized Algal biomass Coelastrella sp." Polish Journal of Chemical Technology 26, no. 2 (2024): 57–68. http://dx.doi.org/10.2478/pjct-2024-0019.
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Abstract Currently, adsorption stands as a viable technique for the effective removal of pollutants such as heavy metals from water. Within this research endeavor, adapted green algae (Coelastrella sp.) have been harnessed as a sustainable and environmentally conscious adsorbent, employed in the removal of Hg(II) ions from a simulated aqueous solution via employment of an Airlift bioreactor. The analysis of the attributes of adsorbent was conducted through the utilization of Fourier transform infrared (FTIR) spectroscopy. The examination of residual concentrations of Hg(II) ions in the treated solution was accomplished through the utilization of atomic absorption spectroscopy (AAS). The impact of various experimental factors, including the duration of contact (ranging from 10 to 90 minutes), initial concentrations of Hg(II) ions (ranging from 500 to 2000 μg/l), quantity of adsorbent introduced (ranging from 0.1 to 0.7 g per 250 ml), temperature variations (ranging from 20 to 40 °C), and airflow velocity (ranging from 200 to 300 ml/min), was systematically examined. For the optimization of adsorption efficiency, MINITAB 18 software was employed. The equilibrium data was subjected to analysis using the Langmuir, Freundlich, and Temkin isotherm models. Employing the framework recommended by MINITAB 18, the optimal parameters for adsorption were identified as 2000 μg/l for initial concentration, 90 minutes for contact time, 40 °C for temperature, and 300 ml/min for airflow rate. The Langmuir equation yielded the highest adsorption capacity, measuring 750 μg/g at a temperature of 40 °C.
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Wu, Zhixin, Long He, Jiarui Hou, Guo Li, and Jiale Ma. "Study on the Effects of Pasture Fiber on Thermal Properties of Slag Bricks." Materials 17, no. 15 (2024): 3704. http://dx.doi.org/10.3390/ma17153704.
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In the context of ecological sustainability, this study focuses on the effect of variables of pasture fibers on the thermal properties of slag bricks made from a green recyclable material. This experiment uses slag as the binder, sand as the aggregate, and pasture fiber as an additive. The experimental variables include the additive content ratio of the pasture fiber, the size of the pasture fiber, and the type of pasture fiber. Significance analysis of the experimental results of the thermal performance tests is carried out using Minitab 18.1.0 software, and the optimal ratios for the thermal performance of the composite samples are derived from the response optimizer and conformity analysis. The results of the experiment’s test analysis using Minitab 18 software indicate that, with an increase in pasture fiber content, the thermal performance of the composite samples initially decreases before increasing. Additionally, the lower the thermal conductivity of the composite sample, the lower the apparent density and the higher the porosity. Incorporating pasture fibers into slag bricks, as revealed in this study, reduces the waste of pasture resources in pastoral areas and promotes the development of sustainable building materials with favorable thermal properties.
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Tarigan, Pelinta, El Roy Denito, and Yoyok Cahyono. "PENGARUH PROFITABILITAS, KUALITAS AUDIT DAN LEVERAGE TERHADAP PERATAAN LABA (STUDI EMPIRIS PADA PERUSAHAAN LQ 45 YANG TERDAFTAR DI BURSA EFEK INDONESIA TAHUN 2013-2017)." SITRA 2, no. 2 (2022): 105–22. http://dx.doi.org/10.58872/si.v2i2.81.
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Penelitian ini bertujuan untuk mengetahui secara simultan maupun parsial Pengaruh Profitabilias, Kualitas Audit, Leverage Terhadap Perataan Laba Pada Perusahaan LQ 45 yang terdaftar Di Bursa Efek Indonesia Periode 2013-2017. Dalam penelitian ini, sampel yang diambil sebanyak 18 perusahaan. Peneliti menggunakan metode penelitian kuantitatif. Teknik yang digunakan dalam pengambilan sampel yaitu purposive sampling. Jenis data yang digunakan dalam penelitian ini adalah data sekunder. Teknik pengumpulan data menggunakan laporan keuangan. Teknik analisis data yang digunakan dalam penelitian ini adalah analisis statistik deskriptif, uji asumsi klasik, regresi linier berganda dan uji hipotesis. Hasil penelitian yang diolah dengan program minitab versi 18 menunjukkan bahwa secara parsial Profitabilitas dan Kualitas Audit tidak berpengaruh terhadap perataan laba. Sedangkan Leverage berpengaruh terhadap Perataan Laba. Secara simultan variabel Profitabilitas, Kualitas Audit dan Leverage berpengaruh signifikan terhadap Perataan Laba.
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Gugulothu, Bhiksha, P. S. Satheesh Kumar, Bathula Srinivas, Alapati Ramakrishna, and S. Vijayakumar. "Investigating the Material Removal Rate Parameters in ECM for Al 5086 Alloy-Reinforced Silicon Carbide/Flyash Hybrid Composites by Using Minitab-18." Advances in Materials Science and Engineering 2021 (November 3, 2021): 1–6. http://dx.doi.org/10.1155/2021/2079811.
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This study explained about machining parameters of Al5086/Flyash/Sic hybrid metal matrix composites by the Taguchi technique. Al5086 reinforced in SiC (5–10 wt %) and 8% weight of flyash are retained as constants. The specimens are prepared with the help of the stir casting method. The material removal rate was examined by electrochemical machining under various parameters such as feed rate (0.15–0.30 mm/min), voltage (10–20 V), and electrolyte concentration (20–35 g/litre). Taguchi’s L16 orthogonal array was selected for design of experiments (DOEs), and 16 experimental tests were conducted to examine the effect of the selected machining parameters employed to identify the best optimal levels and also to investigate the effect of electrochemical machining parameters on MRR determined by Minitab-18.
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ZAINUDIN, RAMLAH, and SITI NURLYDIA SAZALI. "A MORPHOMETRIC ANALYSIS OF HYLARANA SIGNATA GROUP (PREVIOUSLY KNOWN AS RANA SIGNATA AND RANA PICTURATA) OF MALAYSIA." International Journal of Modern Physics: Conference Series 09 (January 2012): 199–208. http://dx.doi.org/10.1142/s2010194512005260.
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A study on morphometrical variations of Malaysian Hylarana signata group was conducted to reveal the morphological relationships within the species group. Twenty-seven morphological characters from 18 individuals of H. signata and H. picturata were measured and recorded. The numerical data were analysed using Discriminant Function Analysis in SPSS program version 16.0 and UPGMA Cluster Analysis in Minitab program version 14.0. The results show the complexity clustering between the examined species that might be due to ancient polymorphism of the lineages or cryptic species within the group. Hence, further study should include more representatives in order to fully elucidate the morphological relationships of H. signata group.
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Sartika Sihotang, Jenny, Christine Wulandari, and Susni Herwanti. "Nilai Objek Wisata Air Terjun Way Lalaan Provinsi Lampung Dengan Metode Biaya Perjalanan (Travel Cost)." Jurnal Sylva Lestari 2, no. 3 (2014): 11. http://dx.doi.org/10.23960/jsl3211-18.
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Attraction Waterfall Way Lalaan is one form of environmental services are less developed but has significant economic potential if managed properly. It is therefore necessary to study with the aim of determining the value of the waterfall attraction Way Lalaan visitor characteristics and determine the effect on travel expenses. Benefits of the research results are used as consideration in future management of this attraction. The study was conducted in March-April 2013 with as many as 96 respondents with direct interviews with travel costs were proxied visitors. Determination results of visitor travel expenses will be tested using multiple linear analysis with Minitab 16 software.The results showed the cost of travel for visitors Rp.16.284.500/orang/kali visit. The average cost of a trip Rp.203.104 person / visit. Recreational value of Rp. 487 449 600/year. Variables outside the province, age and marital status simultaneously have a real influence on the cost of the trip. The value of the standard deviation (S) is Rp.151.589. The amount of influence the dependent variables simultaneously (R-Sq) was 61.9% and R-Sq (adj) which means the amount fluctuates depending on the variables influence the correlation of independent variables were added to a dependent variable is equal to 54.8%, while 45.2 % influenced by other variables.
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Yuliatun, Simping, Zalma Attaya, and Kiki Febrianto. "Optimasi Proses Bleaching Selulosa Ampas Tebu dengan Menggunakan Metode Respon Permukaan." Indonesian Sugar Research Journal 4, no. 1 (2024): 43–55. http://dx.doi.org/10.54256/isrj.v4i1.125.
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Ampas tebu dapat dijadikan sebagai bahan baku produksi α-selulosa. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi NaOCl dan waktu pemanasan terhadap kandungan lignin pada sampel dengan parameter nilai bilangan kappa yang terkecil.. Rancangan percobaan yang digunakan adalah rancangan Central Composite Design (CCD) dengan 2 faktor yaitu konsentrasi NaOCl dan waktu pemanasan menggunakan fitur assistant pada aplikasi minitab 19 sehingga diperoleh 18 satuan percobaan. Data dianalisis dengan menggunakan Response Surface Method (RSM) untuk menentukan perlakuan terbaik. Hasil penelitian menunjukkan bahwa perlakuan bleaching optimum diperoleh dengan variasi konsentrasi NaOCl 5% dan waktu pemanasan selama 123,03 menit dengan nilai bilangan kappa 15,11 dan kadar lignin 3,50%. Kadar a-selulosa yang diperoleh 87,94%. Hasil FTIR menunjukkan bahwa α-selulosa belum murni, masih terdapat lignin.
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Pertiwi, Beta Cahaya, Fariz Santoso Putra, and Sintha Soraya Santi. "Penentuan Kondisi Optimum pada Pembuatan Surfaktan Natrium Lignosulfonat dari Tempurung Biji Nyamplung." ChemPro 1, no. 01 (2020): 56–62. http://dx.doi.org/10.33005/chempro.v1i01.49.
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Sodium Lignosulfonat dapat diproduksi secara sulfonasi langsung dengan bahan baku tempurung biji buah nyamplung (Calophyllum unophyllum Linn.) menggunakan Sodium Bisulfit sebagai agen pensulfonasi. Penelitian ini dilakukan pada suhu operasi yang bervariasi 60 oC, 70 oC, 80 oC, 90 oC, 100oC serta pada pH 1,2,3,4,5. Hasil yang didapatkan kemudian dianalisa dengan menggunakan Spektrofotometri UV-VIS. Hasil analisa yang kemudian dioptimisasi dengan menggunakan metode Respon Permukaan. Kadar terbesar yang dihasilkan dari penelitian ini berada pada suhu 100 oC dan pH 5 dengan konsentrasi sebesar 9,16 mg/L. Optimisasi dilakukan untuk menentukan kondisi optimum dalam memproduksi sodium lignosulfonat. Hasil dari optimisasi diketahui bahwa kondisi optimum yaitu pada suhu 100 oC dan pada pH 5 dengan konsentrasi sebesar 7,33343 mg/L dengan menggunakan software Minitab 18.
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AYDIN, Erman. "Taguchi Optimizasyon Metodunun İmalat Mühendisliği Alanında Kullanımı: Minitab Örneği." Uludağ University Journal of The Faculty of Engineering 28, no. 3 (2023): 1049–68. http://dx.doi.org/10.17482/uumfd.1314990.
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Bu çalışmada, bir çok mühendislik alanında toplam kalite yönetimi kapsamında kullanılmakta olan Taguchi optimizasyon metodu, deney tasarımı ve ANOVA’nın imalat mühendisliği alanında kullanımı üzerinde durulmuştur. İmalat süreçlerinde (tornalama, frezeleme, delme vb.) kullanılan kesme hızı (V_C), ilerleme değeri (f), kesme derinliği (a), kesici takım uç açıları, farklı kesici takım profilleri, kesici takım kaplama türleri ve diğer birçok faktör imalat aşamasında doğru saptanması gereken önemli faktörlerdir. Bu faktörlerin seviyelerinin doğru tayin edilmesi, hem zaman hem de maliyet açısından büyük öneme sahiptir. Ancak, bu parametrelerin doğru tayin edilebilmesi için gerçekleştirilecek deneysel çalışmalar yüksek maliyetli olmaktadır. Bu sebepten dolayı, deneysel tasarım süreçleri kullanılarak en az deney sayısı ile sonuçlar elde edilmesi ve bu sonuçların doğrulama deneyleri ile kıyaslanmasının ardından optimum faktör seviyelerinin belirlenmesi hedeflenmektedir. Bu sebeple, doğru deneysel tasarımlar yapılması büyük önem arz etmektedir. Hem sanayi kuruluşlarındaki Ar-Ge birimlerine hem de yüksek lisans ve doktora öğrencilerinin akademik çalışmalarına bir rehber niteliğinde olması amacıyla, imalat mühendisliği alanında Taguchi optimizasyon metodu ile yapılan çalışmalar incelenmiş, imalat alanında kullanım örnekleri ile ele alınarak Minitab 18 paket programı aracılığıyla sade bir şekilde açıklanmıştır. Sonuç olarak, yeni araştırmacılar için Taguchi optimizasyon metodunu, deney tasarımını ve ANOVA’yı en efektif şekilde nasıl kullanabilecekleri hakkında rehber niteliğinde örnek bir çalışma gerçekleştirilmiştir.
Dissertations / Theses on the topic "Minitab 18"
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Bowen, Richard Strong. "Minimal Circuits for Very Incompletely Specified Boolean Functions." Scholarship @ Claremont, 2010. https://scholarship.claremont.edu/hmc_theses/18.
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In this report, asymptotic upper and lower bounds are given for the minimum number of gates required to compute a function which is only partially specified and for which we allow a certain amount of error. The upper and lower bounds match. Hence, the behavior of these minimum circuit sizes is completely (asymptotically) determined.
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Moukarab, Aly Ahmed. "Guidance needs of 14-18 year old students in Egypt, with particular reference to Minia County." Thesis, University of East Anglia, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327742.
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Bezerra, Alexandre Araújo. "Estudo do desgaste no roscamento com alta velocidade em ferro fundido." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-07022017-102750/.
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Estudou-se os mecanismos e tipos de desgaste atuantes nos machos de corte no processo de roscamento com velocidades comumente utilizadas na indústria e com alta velocidade de corte, de forma a avaliar a influência da velocidade de corte, do tipo de revestimento de ferramenta e da condição de lubri-refrigeração sobre o desempenho dos machos de corte. A qualidade da rosca usinada e a formação de cavaco também foram objetos de estudo. Mediram-se sinais de torque e de corrente ao longo da vida das ferramentas, avaliando as suas possibilidades como indicadores de desgaste. O roscamento de furos passantes M8x1,25 foi realizado com velocidades de corte de 30 ou 60 m/min em ferro fundido cinzento GG25 nas condições sem fluido de corte ou com mínima quantidade de lubrificante (MQL). Foram utilizados machos de corte de aço rápido comum e fabricados por metalurgia do pó revestidos, com TiAIN ou com TiCN. Os principais mecanismos de desgaste foram abrasão, adesão e difusão, enquanto o principal tipo de desgaste observado foi o de flanco. A adesão de material da peça sobre a ferramenta foi o principal fator determinante do final de vida dos machos de corte. A utilização de revestimento foi eficiente na minimização da adesão. Entretanto, o TiAIN foi melhor em termos de vida da ferramenta e o TiCN na redução do torque e na qualidade visual da rosca usinada. A técnica MQL propiciou melhorias na usinagem em comparação com a condição a seco, principalmente na redução do torque em machos de corte revestidos. Os sinais de torque e de corrente foram eficientes no acompanhamento do desgaste de flanco apenas nos machos de corte revestidos. Por outro lado, apenas os sinais de torque podem servir como indicativo das etapas do ciclo de roscamento.<br>The mechanisms and types of wear were studied in tools used in the tapping process performed with speeds commonly used in the industry and also with high cutting speed. It was evaluated the influence of cutting speed, type of tool coating and cooling/lubrication condition on the performance of the taps. The quality of the machined threads and the chip formation were also assessed. During the experiments, torque and current signals were measured, assessing the possibilities of using them as tool wear indicators. The tapping of through holes M8x1,25 was accomplished with cutting speeds of 30 or 60 m/min in gray cast iron GG25 in the conditions dry or with Minimal Quantity of Lubricant (MQL). Taps of plain High Speed Steel (HSS) and taps manufactured by powder metallurgy and coated (HSS-Co-PM, one with TiAIN and other with TiCN) were used. The main wear mechanisms observed were abrasion, adhesion and diffusion, while the principal type was the flank wear. The adhesion of workpiece material on the tools was the main decisive factor for the end of tool life. The tool coatings used were efficient in minimizing the adhesion. However, TiAIN was better in terms of tool life and TiCN in the reduction of torque and also led to a better visual quality on the machined threads. The MQL technique brought improvements to the machining in comparison to the dry cutting condition, mainly in the reduction of the torque in coated taps. The torque and current signals wereefficient in indicating the flank wear, only on coated taps. On the other hand, the torque signals can only be used as indicative of tapping cycle stages.
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Silva, Leonardo Roberto da. "Estudo da geometria da aresta de corte de ferramentas aplicadas ao torneamento de superligas à base de níquel com alta velocidade de corte." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-13052016-153736/.
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Pesquisadores e indústrias de todo o mundo estão firmemente comprometidos com o propósito de fazer o processo de usinagem ser precisamente veloz e produtivo. A forte concorrência mundial gerou a procura por processos de usinagem econômicos, com grande capacidade de produção de cavacos e que produzam peças com elevada qualidade. Dentre as novas tecnologias que começaram a ser empregadas, e deve tornar-se o caminho certo a ser trilhado na busca da competitividade em curto espaço de tempo, está a tecnologia de usinagem com altas velocidades (HSM de High Speed Machining). A tecnologia HSM surge como componente essencial na otimização dos esforços para manutenção e aumento da competitividade global das empresas. Durante os últimos anos a usinagem com alta velocidade tem ganhado grande importância, sendo dada uma maior atenção ao desenvolvimento e à disponibilização no mercado de máquinas-ferramentas com rotações muito elevadas (20.000 - 100.000 rpm). O processo de usinagem com alta velocidade está sendo usado não apenas para ligas de alumínio e cobre, mas também para materiais de difícil usinabilidade, como os aços temperados e superligas à base de níquel. Porém, quando se trata de materiais de difícil corte, têm-se observado poucas publicações, principalmente no processo de torneamento. Mas, antes que a tecnologia HSM possa ser empregada de uma forma econômica, todos os componentes envolvidos no processo de usinagem, incluindo a máquina, o eixo-árvore, a ferramenta e o pessoal, precisam estar afinados com as peculiaridades deste novo processo. No que diz respeito às máquinas-ferramenta, isto significa que elas têm que satisfazer requisitos particulares de segurança. As ferramentas, devido à otimização de suas geometrias, substratos e revestimentos, contribuem para o sucesso deste processo. O presente trabalho objetiva estudar o comportamento de diversas geometrias ) de insertos de cerâmica (Al2O3 + SiCw e Al2O3 + TIC) e PCBN com duas concentrações de CBN na forma padrão, assim como modificações na geometria das arestas de corte empregadas em torneamento com alta velocidade em superligas à base de níquel (Inconel 718 e Waspaloy). Os materiais foram tratados termicamente para dureza de 44 e 40 HRC respectivamente, e usinados sob condição de corte a seco e com utilização da técnica de mínima quantidade de lubrificante (minimal quantity lubricant - MQL) visando atender requisitos ambientais. As superligas à base de níquel são conhecidas como materiais de difícil usinabilidade devido à alta dureza, alta resistência mecânica em alta temperatura, afinidade para reagir com materiais da ferramenta e baixa condutividade térmica. A usinagem de superligas afeta negativamente a integridade da peça. Por essa razão, cuidados especiais devem ser tomados para assegurar a vida da ferramenta e a integridade superficial de componentes usinados por intermédio de controle dos principais parâmetros de usinagem. Experimentos foram realizados sob diversas condições de corte e geometrias de ferramentas para avaliação dos parâmetros: força de corte, temperatura, emissão acústica e integridade superficial (rugosidade superficial, tensão residual, microdureza e microestrutura) e mecanismos de desgaste. Mediante os resultados apresentados, recomenda-se à geometria de melhor desempenho nos parâmetros citados e confirma-se a eficiência da técnica MQL. Dentre as ferramentas e geometrias testadas, a que apresentou melhor desempenho foi a ferramenta cerâmica CC650 seguida da ferramenta cerâmica CC670 ambas com formato redondo e geometria 2 (chanfro em T de 0,15 x 15º com raio de aresta de 0,03 mm).<br>Researchers and industry personnel around the world are firmly committed to the purpose of doing the machining process dramatically faster and more precise. The tough global competition has generated a search for more economical machining processes, with high ability for chip removal and, in this way, producing high quality workpieces. Among the new technologies available nowadays, the high speed machining (HSM) is pointed out as the main solution to obtain competitiveness in a short period of time. The HSM technology appears as an essential component to optimize the efforts for maintaining, and increasing, the global competitiveness. During the last years, high speed machining technology has received great attention, specially the development and availability in the market of machine tools with high rotational speeds (20.000 - 100.000 rpm). The HSM has been used not only to machine aluminum and copper alloys, but also to difficult to machine rnaterials, such as hardened steels and nickel based superalIoys. However, for difficult to machine materiais, the literature is very incipient, specially concerning the turning process. However, before the HSM technology be used in an economic way, alI the components involved in the machining process, including the machine, the spindle, the tool and the operators, need to be tuned with the peculiarities of this new process. Concerning the tooling, they have to satisfy peculiar requirements of safety. Due to the optimization of their geometries, substrates and coatings, the cutting tools are contributing to the success of the process. The present work aims at the study of several insert geometries of ceramic tools (Al2O3 + SiCw and Al2O3 + TiC) and PCBN, with two concentrations of CBN, in the standard format and with modifications on the cutting edge geometry, working in the high speed turning of nickel based superaIloys (lnconel 718 and Waspaloy]. MateriaIs were heat treated to hardness of 44 and 40 HRC, respectively, and machined under dry cutting condition and also with minimal quantity of lubricant (MQL) to attend environmental requirements. The nickel based superalloys are known as difficult to cut materials due to their high hardness, high mechanical strength at high temperature, chemical affinity to tool materiaIs and lower thermal conductivity. The machining of superalloys affects negatively the integrity of the workpiece. For this reason, tool life and surface integrity of the machined component must be carefully analyzed throughout the control of the main machining parameters. Practical experiments were implemented using several cutting conditions and tool geometries to evaluate the following parameters: cutting force, temperature, acoustic emission and surface integrity (surface finishing, residual stress, microhardeness and microstructure) and wear mechanisms. Analyzing the results, the most suitable geometry for the mentioned parameters is recommended and the efficiency of the MQL technical is confirmed. Among all inserts and geometries tested, the CC650 ceramic tool presented better results, followed by the CC670 ceramic tool, both with round format and edge geometry number 2 (chamfer in T 0,15 x 15° with hone of 0,03 mm).
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Júnior, Josaphat Ricardo Ribeiro Gouveia. "Bifurcações da região de estabilidade induzidas por bifurcações locais do tipo Hopf." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-02072015-142327/.
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Pontos de equilíbrio assintoticamente estáveis de sistemas dinâmicos não lineares geralmente não são globalmente estáveis. Na maioria dos casos, há um subconjunto de condições iniciais, chamada região de estabilidade (ou área de atração), cujas trajetórias tendem ao ponto de equilíbrio quando o tempo tende ao infinito. Devido à importância das regiões de estabilidade em aplicações, e motivado principalmente pelo problema de analise de estabilidade transitória em sistemas elétricos de potência, uma caracterização completa da fronteira da região de estabilidade foi desenvolvida. Esta caracterização foi desenvolvida sob a suposição de que o sistema dinâmico é bem conhecido e que os parâmetros de seu modelo são constantes. Na prática, variações de parâmetros ocorrem e bifurcações desta podem ocorrer. Nesta tese, desenvolveremos uma caracterização completa da fronteira da região de estabilidade de sistemas dinâmicos autônomos não lineares admitindo a existência de pontos de equilíbrio não hiperbólicos do tipo Hopf na fronteira da região de estabilidade. Sob certas condições de transversalidade, apresentaremos uma caracterização completa da fronteira da região de estabilidade admitindo tanto a presença de pontos de equilíbrio não hiperbólicos do tipo Hopf como também a existência de órbitas periódicas na fronteira. Ofereceremos também uma caracterização da fronteira da região de estabilidade fraca do ponto de equilíbrio não hiperbólico Hopf supercrítico do tipo zero e uma caracterização topológica da sua região de atração. Além disso, exibiremos resultados relativos ao comportamento da região de estabilidade de um ponto de equilíbrio assintoticamente estável e da sua fronteira na vizinhança do valor crítico de bifurcação do tipo Hopf.<br>Asymptotically stable equilibrium points of nonlinear dynamical systems are generally not globally stable. In most cases, there is a subset of initial conditions, called stability region (or attraction area), in which trajectories tend to the equilibrium point when time approaches innity. Due to the importance of stability regions in applications, and mainly motivated by the problem of transient stability analysis in electric power systems, a complete characterization of the boundary of the stability region was developed. This characterization was developed under the assumption that the dynamic system is well known and the parameters of its model are constant. In practice, parameter variations happen and bifurcations may occur. In this thesis, we will develop a complete characterization of the boundary of the stability region of autonomous nonlinear dynamical systems admitting the existence of non-hyperbolic equilibrium points of the type Hopf on the boundary of the stability region. Under certain transversality conditions, we present a complete characterization of the boundary of the stability region admitting the presence of both non-hyperbolic equilibrium points of the type Hopf and periodic orbits on the boundary. Also a complete characterization of the boundary of the region of weak stability of a supercritical Hopf non-hyperbolic equilibrium point of the type zero and a topological characterization of its region of attraction is developed. Furthermore, the behavior of the stability region of an asymptotically stable equilibrium point and its boundary in the neighborhood of a critical value of bifurcation of the type Hopf is studied.
Books on the topic "Minitab 18"
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Joel, Shapiro. Joel Shapiro: Sculpture and drawings : April 30-June 18, 1993 : The Pace Gallery. The Gallery, 1993.
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Mompó, H. Mompó: Constelaciones, representaciones, signos : IVAM Centre Julio González, 17 mayo-18 agosto 1991. IVAM Centre Julio González, Generalitat Valenciana, Conselleria de Cultura, Educació, i Ciencia, 1991.
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Art, Baltimore Museum of, ed. Bodyspace: [exhibition] the Baltimore Museum of Art, 18 February-27 May 2001. [Baltimore Museum of Art], 2001.
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Museums, Harvard University Art, and Busch-Reisinger Museum, eds. Dependent objects: Busch-Reisinger Museum, September 18, 2004-January 2, 2005. Publications Department, Harvard University Art Museums, 2004.
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Mompó, H. Mompó: Constelaciones, representaciones, signos : IVAM Centre Julio González, 17 mayo-18 agosto 1991. IVAM Centre Julio González, Generalitat Valenciana, Conselleria de Cultura, Educació, i Ciencia, 1991.
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Bernhard, Bürgi, Kunsthalle Zürich, Moderna museet (Stockholm Sweden), and Museum Fridericianum, eds. Helmut Federle: 6 juni-9 augusti 1992, Kunsthalle Zürich : 22 augusti-11 oktober 1992, Moderna museet, Stockholm : 15 februari-18 april 1993, Museum Fridericianum, Kassel. Moderna museet, 1992.
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Khan, Mr Rehman. SIx Sigma Statistics using Minitab 18: Black Belt Edition,. Independently published, 2019.
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Moore, David S. The Practice of Business Statistics w/CD, Minitab Manual, Minitab Version 12 & Companion Chapters 12 & 18. W. H. Freeman, 2005.
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Le langage de Steve Reich: L'exemple de Music for 18 musicians (1976) (French Edition). Editions L'Harmattan, 2008.
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Bonekemper III, Edward H. Grant and Lee. Praeger, 2007. http://dx.doi.org/10.5040/9798400658761.
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Grant and Lee: Victorious American and Vanquished Virginianis a comprehensive, multi-theater, war-long comparison of the commanding general skills of Ulysses S. Grant and Robert E. Lee. Unlike most analyses, Bonekemper clarifies the impact both generals had on the outcome of the Civil War - namely, the assistance that Lee provided to Grant by Lee's excessive casualties in Virginia, the consequent drain of Confederate resources from Grant's battlefronts, and Lee's refusal and delay of reinforcements to the combat areas where Grant was operating. The reader will be left astounded by the level of aggression both generals employed to secure victory for their respective causes, demonstrating that Grant was a national general whose tactics were consistent with achieving Union victory, whereas Lee's own priorities constantly undermined the Confederacy's chances of winning the war. Building on the detailed accounts of both generals' major campaigns and battles, this book provides a detailed comparison of the primary military and personal traits of the two generals. That analysis supports the preface discussion and the chapter-by-chapter conclusions that Grant did what the North needed to do to win the war: be aggressive, eliminate enemy armies, and do so with minimal casualties (154,000), while Lee was too offensive for the undermanned Confederacy, suffered intolerable casualties (209,000), and allowed his obsession with the Commonwealth of Virginia to obscure the broader interests of the Confederacy. In addition, readers will find interest in the 18 clean-cut and lucid battle maps as well as a comprehensive set of appendices that describes the casualties incurred by each army, battle by battle.
Book chapters on the topic "Minitab 18"
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Bumbăcilă, Bogdan, and Mihai V. Putz. "Minimal Steric Difference." In New Frontiers in Nanochemistry. Apple Academic Press, 2020. http://dx.doi.org/10.1201/9780429022951-18.
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Canning, Nick. "Minimal prep quizzes." In Teaching English with Corpora. Routledge, 2022. http://dx.doi.org/10.4324/b22833-18.
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Shu-Zhong, Shi, and Chang Kung-Ching. "A Local Minimax Theorem Without Compactness." In Nonlinear and Convex Analysis. CRC Press, 2023. http://dx.doi.org/10.1201/9781003420040-18.
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Andres, Kecskeméthy. "Minimal-Form Multibody Dynamics for Embedded Multidisciplinary Applications." In ROMANSY 18 Robot Design, Dynamics and Control. Springer Vienna, 2010. http://dx.doi.org/10.1007/978-3-7091-0277-0_3.
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Ward, Harriet, Lynne Moggach, Susan Tregeagle, and Helen Trivedi. "Permanence." In Outcomes of Open Adoption from Care. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76429-6_5.
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AbstractThis chapter considers how far the Barnardos adoptees achieved legal, residential and emotional permanence after adoption. It draws on minimal follow-up data, available for 124 adoptees (59% of the original cohort); extensive data collected through responses to an online survey concerning 93 adoptees (44% of the cohort) 5–37 years after placement; and interviews focusing on 24 adult adoptees. Ages at follow-up ranged from 5 to 44. All adoptees had achieved legal permanence. Many had achieved residential permanence after numerous placements in care: 34% of those aged 18 or over were still living with their adoptive parents. Twelve (13%) placements had disrupted, but all except eight (9%) adoptees had achieved psychological permanence. Relationships between adoptees and adoptive parents were twice as likely to persist as those between care leavers and foster parents.
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Ward, Harriet, Lynne Moggach, Susan Tregeagle, and Helen Trivedi. "Post-adoption Contact and Relationships with Birth Family Members." In Outcomes of Open Adoption from Care. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76429-6_6.
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AbstractThe chapter draws on data collected through responses to an online survey concerning 93 adoptees (44% of the cohort), completed on average 18 years after placement, and interviews focusing on 24 adult adoptees. Face-to-face post-adoption contact was a legal requirement. After placement with adoptive families, 93% of adoptees had contact with birth family members; at follow-up, 56% still saw at least one member of their birth family; 69% of both adoptees and adoptive parents thought contact was ultimately beneficial. There was minimal evidence of contact with birth parents destabilising placements. However, it introduced a ‘painful transparency’ for all parties and could be problematic. Over time, contact supported children’s identity needs by incorporating knowledge of their antecedents and could mitigate their difficulties with attachment, separation and loss. It forced all parties to engage with one another and helped adoptees achieve closure.
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Gurzynski-Weiss, Laura, Lara Bryfonski, and Derek Reagan. "Chapter 11. Teacher IDs and task adaptations." In Individual Differences and Task-Based Language Teaching. John Benjamins Publishing Company, 2024. http://dx.doi.org/10.1075/tblt.16.11gur.
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This multi-site study explores how 18 graduate-level L2 teacher participants adapted tasks from the TBLT Language Learning Task Bank for specific learner needs and teaching contexts, and if their individual differences (IDs) influenced their adaptations. Participants first completed a questionnaire about their experiences as L2 learners and teachers, their knowledge of TBLT, and how they search for course materials. They then defined a teaching context (current, past, or prospective), specified a task need (i.e., communicative practice of a specific linguistic target), and identified task features to search for in the Task Bank. Next, participants screen captured and recorded their search and evaluation of possible tasks while thinking aloud, choosing one to adapt to their context. Finally, participants watched their video and submitted a written reflection. Bottom-up thematic analysis was used to determine how participants adapted the tasks from the Task Bank, if their IDs related to the ways they adapted their selected task, and whether these adaptations aligned with their specific teaching context. The results showed that all 18 teachers were successful in adapting their tasks to align with their stated teaching context and learner needs, demonstrating that the Task Bank works well for the target audience of diverse teachers. It was also found that teacher IDs did not play a role in their task adaptations when examined separately. However, a qualitative cluster analysis showed that more experienced teachers tended to focus on providing linguistic instruction and increasing interaction in task adaptation while less experienced teachers utilized a wide array of techniques. The minimal ID cluster profiles that were discernible lend support to the consideration of IDs in tandem with – rather than in isolation from – each other.
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Chilma-Arias, Andres, Sebastian Giraldo-Vaca, and Juan A. Sánchez. "A Light Pollution Assessment in the Fringing Reefs of San Andrés Island: Towards Reducing Stressful Conditions at Impacted Coral Reefs." In Disaster Risk Reduction. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-6663-5_5.
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AbstractThe degradation of the night sky’s quality due to artificial light sources negatively affects marine environments, because many organisms use natural light as cues for reproductive and dispersal behaviors, find favorable habitats, and for the biochemistry of their symbiotic microorganisms. Despite the tremendous effect on marine life, measuring the effects of artificial light pollution is difficult because our understanding of natural light brightness coming from celestial bodies like the Moon is minimal. Here, we fill this gap by quantifying the sky’s brightness and Artificial Light Pollution at Night (ALAN). This study assessed light pollution along the reefs around San Andrés Island, which Hurricane Iota significantly impacted. We modified and installed Sky Quality Meters (LU-DL) at both leeward and fringing reefs, down to 11 m depth. The results indicate the highest ALAN values in the area of Johnny Cay (18 msas) compared to Acuario (20 msas) and West View (21 msas). Additionally, National Oceanic and Atmospheric Administration NOAA and Unihedron databases show an increase in artificial light on land, where constant artificial light and coastal vegetation loss due to Hurricane Iota (between 15 and 19th November 2020), are the main factors that may be generating this increase in artificial light.
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"Prediction of Stress Levels That Cause Product Failure." In Reliability Analysis with Minitab. CRC Press, 2016. http://dx.doi.org/10.1201/b19630-18.
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"Factorial Design of Experiments to Optimize a Chemical Process." In Six Sigma Case Studies with Minitab. CRC Press, 2014. http://dx.doi.org/10.1201/b16371-18.
Full textConference papers on the topic "Minitab 18"
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Roudabush, L. A. "The Effect of Coating Iron Content on the Cosmetic Corrosion Performance of Electrodeposited Zinc-Iron Alloy Coated Sheet." In CORROSION 1991. NACE International, 1991. https://doi.org/10.5006/c1991-91408.
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Abstract Electro-deposited zinc-iron alloy coatings with iron contents in the range of 9 to 18 percent were evaluated for cosmetic corrosion performance in a variety of accelerated and long-term automotive exposure tests. As the iron content of the alloy decreased towards 9%, the paint undercutting from a scribe line of the alloyed coatings exhibited more active behavior, similar to that of pure zinc coatings, and displayed little, if any, red rust in the scribe line. As the iron content of a zinc-iron alloy coating increased to 18%, the paint undercutting was lessened with an accompanying increase in red rust within the scribe line. The optimum cosmetic corrosion resistance was provided by iron-zinc alloys containing 12 to 15 percent iron-zinc, which exhibited a combination of minimal paint undercutting from the scribe line and minimal red rust staining of exposed steel substrate.
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Elliott, David. "The 525 Transmission Development Test Stand." In Vertical Flight Society 72nd Annual Forum & Technology Display. The Vertical Flight Society, 2016. http://dx.doi.org/10.4050/f-0072-2016-11555.
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Testing of high speed / high power helicopter transmissions is required to meet regulatory requirements and promote product safety. Transmission development testing typically ranges from 18 months to two years and involves tests that include; Oil Management, Gear Tooth Pattern Development, Gear Tooth Bending Fatigue, Endurance and Loss of Lubricant Testing. To accomplish these goals for the Bell 525, Bell Helicopter has developed new electrically regenerative test stands that both deliver and absorb power in the drive path. These new test stands provide a means to test the transmissions of other helicopter models with minimal changes, resulting in lower development costs. The transmission test system utilizes electric motors on the input side of the drive system and a generator on the output. While full power is passed through the drive system, the regenerative cycle means that net power consumed is limited to just the electrical and drive system losses - a small fraction of the drive system power. This paper reviews the design approach of the 525's electrically regenerative test stand and compares this system to prior mechanically regenerative test stand designs. The new approach, allows Bell Helicopter to achieve enhanced test efficiency resulting in faster development cycles and direct savings to the customer.
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Матвієнко, Ю. О., О. М. Рекалова, О. Р. Панасюкова та ін. "Вплив перенесеної COVID-19 і фактора стресу під час воєнного стану на інтегральний індекс активності запалення у хворих на туберкульоз легень". У Міжнародна науково-практична конференція, присвячена Всесвітньому дню здоров’я: «Інноваційні підходи до діагностики, лікування туберкульозу та інших захворювань легень: практичні рекомендації для лікарів загальної практики, фтизіатрів і пульмонологів» 7 квітня 2025 року (онлайн), м. Київ, Україна. Національний науковий центр фтизіатрії, пульмонології та алергології імені Ф.Г. Яновського, 2025. https://doi.org/10.32902/2663-0338-2025-1s-18.
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Обґрунтування. В Україні ефективність лікування туберкульозу (ТБ) в післяпандемічний період в умовах воєнного стану після перенесеної коронавірусної хвороби (COVID-19) значною мірою залежить від стану різних систем організму, насамперед імунної. Патогенез ТБ зумовлений низкою чинників як ендо-, так і екзогенного походження. Для визначення ступеня інтоксикації й оцінювання стану вродженого та набутого імунітету в клінічній практиці можуть використовуватися інтегральні гематологічні показники для прогнозу перебігу хвороби (Радченко О.М., 2021; Дзісь Є.І. та ін., 2022). Наприклад, за розвитку тяжкої пневмонії в пацієнтів з COVID-19 або при гострих респіраторних інфекціях різного походження, ВІЛ-інфекції, ТБ вони можуть ефективно відображати ступінь системного запалення в критичних хворих (Лисенко Д.А., 2021; Пилипів Л.І., Радченко О.М., 2024; Зубач О.О. та ін., 2023). Один з таких показників – це інтегральний індекс активності запалення (ІАЗ), який запропонували Сміян О.І. та Гринишин В.В. (2010). Виявлення змін ІАЗ у хворих на ТБ легень після перенесеної COVID-19 дасть змогу прогнозувати його перебіг і коригувати терапевтичні заходи. Мета. З’ясувати діагностичну цінність ІАЗ для оцінювання імунних розладів у пацієнтів із чутливим ТБ (ЧТБ) легень у доковідний (2018-2019 рр.), пандемічний довоєнний (2020-2021 рр.) та воєнний періоди (2022-2024 рр.). Матеріали та методи. Було проведено ретроспективний аналіз результатів обстеження 66 хворих на ЧТБ легень, які проходили стаціонарне лікування в Національному науковому центрі фтизіатрії, пульмонології та алергології. Серед них було 36 чоловіків (54,5 %) і 30 жінок (45,5 %) з установленим діагнозом ЧТБ. Середній вік дорівнював 37,3±1,6 року. Вперше діагностований ЧТБ мали 77,3 % пацієнтів (51 хворий). У 32 (48,5 %) обстежених хворих на ЧТБ спостерігався деструктивний процес у легенях, у 34 (51,5 %) було виявлено бактеріовиділення. Хворим призначали стандартну чотирикомпонентну схему лікування. Хворі на ЧТБ були розподілені на три групи: 1-ша група – 37 осіб, які обстежувалися при надходженні в стаціонар у доковідний період 2018-2019 рр. (які не хворіли на COVID-19); 2-га група – 14 осіб, що до надходження в стаціонар перехворіли на COVID-19 у період 2020-2021 рр., 3-тя група – 15 осіб, що до надходження в стаціонар перехворіли на COVID-19 у воєнний період 2022-2024 рр. Групи вірогідно не відрізнялися за віком, статтю, формами ТБ. Контрольні групи становили 60 донорів крові без клінічних ознак соматичної й інфекційної патології, середній вік дорівнював 37,6±2,3 року. Підгрупа 1К – 20 осіб, які були обстежені в доковідний період 2018-2019 рр., підгрупа 2К – 15 донорів крові, які перехворіли на лабораторно підтверджену COVID-19 у 2020-2021 рр., підгрупа 3К – 25 донорів крові, які перехворіли на лабораторно підтверджену COVID-19 під час війни у 2022-2024 рр. Пацієнтам визначали показники периферичної крові (абсолютну кількість лейкоцитів, лімфоцитів, моноцитів і гранулоцитів, ШОЕ) за допомогою гематологічного аналізатора АВХ-mіscros 60 (Франція) та розраховували інтегральний гематологічний індекс активності запалення за формулою: ІАЗ = L × ШОЕ/10 + Гр × ШОЕ/100 + АГр × ШОЕ/100, де L – абсолютна кількість лейкоцитів у крові, ШОЕ – швидкість осідання еритроцитів, Гр – відносна кількість гранулоцитів у крові, АГр – відносна кількість агранулоцитів (лімфоцитів і моноцитів) у крові. Математична обробка результатів досліджень проводилися за допомогою програми Minitab 21 з використанням вбудованих бібліотек статистики. Обчислювання критеріальних значень проводилося при заданому рівні значущості р≤0,05. Робота виконана коштом Державного бюджету України. Результати. Встановлено, що у хворих на ЧТБ всіх трьох груп ІАЗ був підвищеним майже втричі та вірогідно відрізнявся від значень здорових осіб у групах порівняння (табл.). Діагностична цінність достовірного підвищення цього показника у хворих на ЧТБ порівняно зі здоровими особами за критерієм Юдена перевищувала 0,10 ум. од. (J = 0,40 ум. од), що свідчило про наявність активного запального процесу при ТБ. Також установлено, що на цей показник не впливали такі екзогенні чинники, як перенесена COVID-19 і хронічний стрес воєнного періоду, оскільки він достовірно не відрізнявся в 1-й, 2-й і 3-й підгрупах хворих. Висновки. Лабораторний гематологічний показник ІАЗ у хворих на ЧТБ легень є надійним показником активності запального туберкульозного процесу, на який не впливають такі екзогенні чинники, як перенесена COVID-19 і фактор стресу під час воєнного стану, що може бути використано для вдосконалення наявних алгоритмів прогнозування перебігу цього захворювання.
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Dick, Nir, Naama Glauber, Adi Yehezkeli, et al. "Design with Minimal Intervention." In DIS '18: Designing Interactive Systems Conference 2018. ACM, 2018. http://dx.doi.org/10.1145/3196709.3196814.
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Giorgi, Pascal, and Vincent Neiger. "Certification of Minimal Approximant Bases." In ISSAC '18: International Symposium on Symbolic and Algebraic Computation. ACM, 2018. http://dx.doi.org/10.1145/3208976.3208991.
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Parque, Victor, and Tomoyuki Miyashita. "Towards bundling minimal trees in polygonal maps." In GECCO '18: Genetic and Evolutionary Computation Conference. ACM, 2018. http://dx.doi.org/10.1145/3205651.3208316.
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Ayub, Muhammad Sohaib, and Junaid Haroon Siddiqui. "Efficiently finding minimal failing input in MapReduce programs." In ICSE '18: 40th International Conference on Software Engineering. ACM, 2018. http://dx.doi.org/10.1145/3183440.3195084.
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Fouda, Mohammed E., Ahmed M. Eltawil, and Fadi Kurdahi. "Minimal Disturbed Bits in Writing Resistive Crossbar Memories." In NANOARCH '18: IEEE/ACM International Symposium on Nanoscale Architectures. ACM, 2018. http://dx.doi.org/10.1145/3232195.3232207.
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Dix-Matthews, Benjamin, Rachel Cardell-Oliver, and Christof Hübner. "LoRa Parameter Choice for Minimal Energy Usage." In SenSys '18: The 16th ACM Conference on Embedded Networked Sensor Systems. ACM, 2018. http://dx.doi.org/10.1145/3277883.3277888.
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Narodytska, Nina, Nikolaj Bjørner, Maria-Cristina Marinescu, and Mooly Sagiv. "Core-Guided Minimal Correction Set and Core Enumeration." In Twenty-Seventh International Joint Conference on Artificial Intelligence {IJCAI-18}. International Joint Conferences on Artificial Intelligence Organization, 2018. http://dx.doi.org/10.24963/ijcai.2018/188.
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A set of constraints is unsatisfiable if there is no solution that satisfies these constraints. To analyse unsatisfiable problems, the user needs to understand where inconsistencies come from and how they can be repaired. Minimal unsatisfiable cores and correction sets are important subsets of constraints that enable such analysis. In this work, we propose a new algorithm for extracting minimal unsatisfiable cores and correction sets simultaneously. Building on top of the relaxation and strengthening framework, we introduce novel techniques for extracting these sets. Our new solver significantly outperforms several state of the art algorithms on common benchmarks when it comes to extracting correction sets and compares favorably on core extraction.
Reports on the topic "Minitab 18"
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McLean, Karen, Elodie O’Connor, Rachel Ong, Corey Joseph, and Sharon Goldfeld. Health, development and learning screening and assessment tools for children and young people aged 5–18 years. The Sax Institute, 2022. http://dx.doi.org/10.57022/julf8952.
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This Evidence Check was commissioned by the Ministry of Health to identify validated health assessment tools for physical health, mental health, development, and family violence for the Wellbeing and Health In-reach Nurse (WHIN) Coordinator program. This program is a partnership between NSW Health and the NSW Department of Education which places nurses in NSW schools to identify the health and social needs of students and coordinate early intervention and referral to services and programs. Validated assessment tools will help the nurses to identify children at risk of academic, behavioural, emotional or health-related difficulties. This Evidence Check also aims to describe how they are used in clinical practice and barriers and enablers to their effective use. Seventy-two assessment tools were found, but coverage of the areas affecting children’s wellbeing was uneven. Mental health had several promising tools, as did development for younger children. However, physical health and family violence did not have well-validated tools. There was little information on how they were used in clinical practice. Enablers for use included minimal training requirements, ease of administration and ready availability. Use of parental as well as teacher reports was seen as valuable. There is a need for further work on tools for physical health and family violence. There is also a need for information on the practicalities of the chosen tools (user acceptability, licensing, costs, and training requirements) and for clear practice guidelines.
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Conery, Ian, Brittany Bruder, Connor Geis, Jessamin Straub, Nicholas Spore, and Katherine Brodie. Applicability of CoastSnap, a crowd-sourced coastal monitoring approach for US Army Corps of Engineers district use. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/47568.
Full textAbstract:
This US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, technical report details the pilot deployment, accuracy evaluation, and best practices of the citizen-science, coastal-image monitoring program CoastSnap. Despite the need for regular observational data, many coastlines are monitored infrequently due to cost and personnel, and this cell phone-image-based approach represents a new potential data source to districts in addition to providing an outreach opportunity for the public. Requiring minimal hardware and signage, the system is simple to install but requires user-image processing. Analysis shows the CoastSnap-derived shorelines compare well to real-time kinematic and lidar-derived shorelines during low-to-moderate wave conditions (root mean square errors [RMSEs] <10 m). During high-wave conditions, errors are higher (RMSE up to 18 m) but are improved when incorporating wave run-up. Beyond shoreline quantification, images provide other qualitative information such as storm-impact characteristics and timing of the formation of beach scarps. Ultimately, the citizen-science tool is a viable low-cost option to districts for monitoring shorelines and tracking the evolution of coastal projects such as beach nourishments.
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Butler, Afrachanna, Catherine Thomas, Nathan Beane, Anthony Bednar, and William Frederick. Phytomanagement of soil and groundwater at the Niagara Falls Storage Site (NFSS) using hybridized trees. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42083.
Full textAbstract:
The Manhattan Engineer District previously used the 191-acre Niagara Falls Storage Site (NFSS) in Niagara County, New York, to store radioactive residues and wastes from uranium (U) ore processing. At present, management practices will determine whether enhanced evapotranspiration rates produced by hybridized shrub willow cuttings planted in 2016 will affect groundwater hydrology. Two shrub willow varieties were planted in an approximately one-half acre area to examine growth performance along a U impacted sanitary sewer line. Additionally, control plots will compare the effectiveness of shrub willows to unplanted areas. Observations of the planted area after 18 months showed success of shrub willow growth with increasing biomass. Chemical analysis from tree tissue samples of the field study showed no significant uptake of U or thorium (Th) to date. A greenhouse study conducted in parallel to the field study tested the willows under controlled greenhouse conditions and evaluated their ability to grow and accumulate contaminants under controlled conditions. Results from the greenhouse study demonstrated that U accumulation was minimal. Thus, this study demonstrates that the shrub willows are not accumulators of U or Th, an advantageous characteristic that implies stabilized contaminants in the soil and no translocation of U into the aboveground biomass.
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Choquette, Gary. PR-000-23COMP-R04 Aboveground Tank Corrosion Comprehensive Compendium. Pipeline Research Council International, Inc. (PRCI), 2023. http://dx.doi.org/10.55274/r0000019.
Full textAbstract:
This compendium is a selection of past PRCI research related to aboveground tank corrosion. Metadata is provided for each resource (when available) including the length of the report, its abstract, author(s), and company that performed the research. The process of identifying reports for this compendium involved keyword searches of all PRCI research documents (and in some cases, research by others). The list of documents identified in that keyword match was then manually reviewed for relevance. Documents that had content that was not directly relevant to the topic of this compendium, had minimal information, or duplicated information were excluded. Specifically, this study reviewed 73 documents and only selected 18 documents that were deemed relevant. Key excerpts and/or notes were taken from those documents and are included here. In many cases, the excerpt/notes are adequate such that the source document does not need to be read separately. However, there are some documents that contain much more content than can be adequately summarized herein. In those cases, the note recommends reviewing that document in its entirety. Links to each of the reports are provided to help facilitate quick access to the related reports. A valid PRCI account is needed to access these links on the PRCI website.
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Al-Qadi, Imad, Hasan Ozer, Aravind Ramakrishnan, and Ashraf Alrajhi. Pavement Distresses Due to Truck Platoons: A Holistic Analysis. Illinois Center for Transportation, 2023. http://dx.doi.org/10.36501/0197-9191/23-015.
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Currently, AASHTOWare PMED does not contain a framework to compute distresses for loading scenarios like truck platoons. Truck platoons reduce fuel consumption and improve safety while increasing pavement damage because of a reduction in wander and rest period. The important parameters of truck platoons are wander, rest period, and penetration level. Unlike wander, the effect of reduced rest period on permanent deformation and platoon penetration level are not well documented. Rest period (i.e., truck spacing) is a critical parameter in platoons that can be controlled to reduce damage or to improve fuel savings. Unlike fatigue cracking, shorter rest periods resulted in lower permanent deformation through conventional repeated load triaxial testing. However, the test does not entail a representative load stress pulse because of moving loads. This study uses modified triaxial testing equipment to simulate different load pulses. Reduced triaxial compression was critical over the conventional load stress pulse. For all representative pulses, the effect of rest period was similar (i.e., increasing rest period increased permanent deformation). The researchers developed a framework to compute pavement distresses as a function of truck platoon parameters. Truck platoons distributed uniformly on sublanes resulted in the lowest damage, even lower than a conventional trucking operation. Truck spacing of 60 ft is optimal in terms of safety, as the difference in distresses were minimal compared to spacing at 18 ft.
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White, Jeremy. Night skies data report: Photometric assessment of night sky quality at Niobrara National Scenic River. National Park Service, 2025. https://doi.org/10.36967/2310882.
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This report characterizes night sky conditions in Niobrara National Scenic River (NIOB) using measurements made in the park unit and models of regional conditions based on satellite data. Calibrated night sky imagery was obtained to characterize the night sky at 2 sites. These ground-based observations were collected on 2 nights from 2024-08-29 to 2024-08-30. Satellite data from 2022 was used to create a map of predicted night sky conditions in and around the park. The sky overhead remains pristine and unaffected by light pollution with an average zenith brightness of 21.62 mag/arcsec2. We estimate more than 99% of stars were still visible for most of the night, providing a unique and unfettered opportunity to observe the natural night sky from the park. The whole sky over NIOB is 9%–18% (mean=14%) brighter than average natural levels, indicating excellent dark sky conditions on average. In NIOB, we classified the sky as Bortle Class 2: typical truly dark site, based on the visibility of astronomical objects. The average naked eye limiting magnitude (NELM) is 6.75, which is approaching near pristine under average conditions. Our Sky Quality Meter (SQM-L) measurements average 21.44 mag/arcsec2, slightly higher than average natural conditions, elevated by Milky Way and airglow luminance. Natural airglow is apparent along the horizon. M33, the Triangulum Galaxy, is seen rather easily with direct vision. The summer Milky Way is highly structured to the unaided eye and visible down to the horizon. Its brightest regions look like veined marble when viewed with ordinary binoculars. The main impact on NIOB’s night sky quality is the light dome from Valentine, NE, with smaller impacts from Ainsworth, NE, Springview, NE, Sicangu Village, SD and Winner, SD. Of these Valentine is the largest and brightest. From Fort Niobrara, the Valentine light dome is the dominant feature of the landscape, significantly brighter than the Milky Way and any other natural feature, although limited to a small portion of the horizon. From Norden Bridge, the Valentine light dome is still the main source of anthropogenic light, and just slightly brighter than the Milky Way, although its footprint is much smaller at that distance and its impact on the overall scene is minimal.
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Shawler, Justin, Aleksandra Ostojic, Joseph Harwood, Christopher Macon, Molly Reif, and Aaron Schad. Geomorphic Monitoring of Coastal Marsh Restoration Sites: Insights from Field and Remote Sensing Approaches in Louisiana, USA. Engineer Research and Development Center (U.S.), 2025. https://doi.org/10.21079/11681/48401.
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Restoration of coastal marshes presents unique geomorphic monitoring challenges because these sites are often remote and/or inaccessible, and time and financial resources for field-based geomorphic monitoring may be limited. Yet, the geomorphic trajectory of coastal marshes controls the overall system health and longevity. The expansion of Unmanned Aircraft System (UAS) technology and new satellite platforms offer opportunities to complement ground-based geomorphic monitoring and overcome the challenges associated with traditional field methods. Here, we compare field-based and remote sensing approaches to monitor two restored coastal wetlands in Louisiana. At Spanish Pass, a restored marsh and ridge system, methods for measuring site elevation, quantifying shoreline position and classifying shoreline geomorphic types were compared. Field elevations measured with RTK GNSS were highly correlated (R2 = 0.97, RMSE = 0.08 m) to site elevations from the UAS lidar digital elevation model (DEM). Both UAS RGB imagery and satellite imagery collected within the same month as field data were within 3 m of field shoreline positions (mean absolute error 2.88 m UAS RGB imagery; 2.86 m October 2022 Google Earth imagery), though datum and slope-based shorelines derived from the UAS lidar DEM had the lowest error (2.09 m datum; 2.32 m slope) compared to the field. National Agriculture Imagery Program (March 2021) and Google Earth (January 2021) imagery collected >18 months prior to field data collection had the least accuracy compared to the field shorelines (mean absolute error 3.13 m and 5.08 m, respectively), likely reflecting shoreline change since that date. In general, field classifications and remotely sensed geomorphic shoreline classifications did not compare well (similarity values 0.4 to 0.6), which supports previous results from the literature that show large differences between field and remote sensing classifications. At La Branche, the second marsh restoration site, access was limited by thick vegetation and ground-based RTK transects were not collected. Thus, UAS lidar DEM elevation data were compared to elevations measured by airborne lidar (2017) and ground surveys (2013) to extend the monitoring record and track elevation change through time. The results demonstrated that minimal measurable elevation change occurred during that time. The airborne lidar data showed consistently lower elevations than field data (within the 0.2 m vegetated accuracy of the lidar), but UAS lidar elevations matched field data, with some spots at slightly higher elevations due to lack of bathymetric lidar data as well as possible accretion of the marsh platform. Overall, the utility and accuracy of both satellite and UAS remote sensing techniques were demonstrated for monitoring shoreline positions and platform elevations. However, marsh shoreline classifications can be improved with additional detail and/or quantification using elevation profile data (e.g., slopes, tidal datums). Practitioners and researchers monitoring coastal marsh restoration sites can use the information presented in this study to assess the tradeoffs and benefits of various methods, including a multi-methods approach as resource and monitoring needs change through time.
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Child marriage briefing: Mali. Population Council, 2005. http://dx.doi.org/10.31899/pgy19.1002.
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This brief provides an overview of child marriage as well as the particulars of child marriage in Mali. Mali is home to 11.6 million people, with 47 percent of its population under age 15. Approximately 73 percent of the population live on less than US$1 a day, and life expectancy is 45 years. Mali has one of the most severe crises of child marriage in the world today. The legal age of marriage is 18 for girls and 21 for boys, but girls may be married as early as age 15 with parental consent. For civil marriages, the law dictates that prospective spouses discuss and agree on whether their union will be polygynous or monogamous; however, a woman’s say in the matter is minimal given her limited options. The payment of bride price is recognized by law, promoting the perception that wives are the property of husbands. In addition, female genital circumcision affects nearly all Malian women, with 61 percent of circumcisions occurring before age 5. Included in this brief are recommendations to promote later, chosen, and legal marriage.