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Design, Manufacturing and Applications of Composites: 7th Joint Canada-Japan Workshop on Composites

作者： Dalili, N. Edrisy, A. Zhang, R. Lo, J. Materials Engineering Graduate Program University of Windsor Windsor ON N9B 3P4 Canada CANMET-MTL Natural Resources OttawaON K1A 0G1 Canada

ISBN: (纸本)9781932078961

in this study metal injection moulding (MIM) process was used as a fabrication method for Ti6A14V-TiC composite samples. The better efficiency, lower cost, design flexibility and high surface finish quality are the main advantages of this method. Ti6A14V and Ti6A14V-10 Wt% TiC (TMCp) tensile samples produced by MIM were tested at different temperatures of 25C, 250C and 400C. The tensile test results showed higher strength for die composite material compared to Ti6A14V sample at all temperatures. The improvement in mechanical properties became more evident at high temperatures. Tribological properties of the Ti6A14V and TMC samples were investigated by wear tests using a ball-on-flat contact geometry under different loads of 5N, 10N and 15N and single pass scratch tests under progressive load of 0.1 to 10 N. The TMCp samples exhibited the lowest wear rate under 5N normal load, which was 6.5 times lower than the wear rate of Ti6A14V sample tested at the same loading conditions. TiC particles were the main contact area. However, at ION and 15N load most of the TiC particles were fractured and consequently the wear rates of TMCp were considerably higher when compared to those of Ti6A14V samples. Nevertheless, particle pull out was not observed on any tribological conditions. Therefore, MIM can be employed as an ex-situ method to produce a good particle-matrix interface.

关键词： Titanium carbide

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Correlation between water quality and land use change in ciliwung watershed

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Nature Environment and Pollution Technology 2018年第1期17卷 139-144页

作者： Effendi, Hefni Sabila, Makna Fathana Setiawan, Yudi Department of Aquatic Resources Management Bogor Agricultural University Indonesia Graduate Program of Natural Resources and Environmental Management Bogor Agricultural University Indonesia Center for Environmental Research Bogor Agricultural University Indonesia

Due to the change of land use, Ciliwung watershed suffered from physical degradation. Considering the increasing land use change along the Ciliwung watershed, it was necessary to perform a research on land use change and its impact on the river water quality (BOD, COD, DO). The land-use forms were divided into six categories: waterbody, bareland, forest, built-up area, agriculture and paddy field. The level of correlation was measured by Pearson correlation. The change of land use of waterbody, bareland, forest, built-up area and dry land agriculture influenced the river water quality. Waterbody had positive effect on water quality, while bareland and built-up area had a negative effect on water quality. © 2018 Technoscience Publications. All rights reserved.

关键词： Watersheds

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Process-Based Thinking in Ecosystem Education

Natural Sciences Education

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natural Sciences Education 2013年第1期42卷 68-74页

作者： Jordan, Rebecca C. Gray, Steven A. Brooks, Wesley R. Honwad, Sameer Hmelo-Silver, Cindy E. Dep. of Ecology Evolution and Natural Resources Rutgers Univ. 59 Lipman Drive Waller Hall Room 104 New Brunswick 08901 NJ United States Dep. of Natural Resources and Environmental Management Univ. of Hawaii at Manoa Honolulu 96822 HI United States Graduate School of Education Rutgers Univ. New Brunswick 08901 NJ United States Graduate Program in Ecology and Evolution Rutgers Univ. New Brunswick 08901 NJ United States

Understanding complex systems such as ecosystems is difficult for young K–12 students, and students’ representations of ecosystems are often limited to nebulously defined relationships between macro-level structural components inherent to the ecosystem in focus (rainforest, desert, pond, etc.) instead of generalizing processes across ecosystems (photosynthesis, decomposition, etc.). This context-dependency might be related to the focus of ecosystem instruction. Most commonly, the components are the first to be introduced and are given the greatest attention in the teaching of ecological and other biological systems. Here, we test the hypothesis that process-centered understanding of ecosystems, as opposed to structured-centered understanding, can facilitate students’ ability to transfer ecosystem concepts to new and novel ecosystems. We found that teachers who taught ecosystem processes more generally were associated with greater variation in student models, indicating a greater range of ideas being represented among the students. Copyright © 2013 by the American Society of Agronomy.

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Effectiveness of Situ for Ciliwung Flood Mitigation in Bogor Regency

Effectiveness of Situ for Ciliwung Flood Mitigation in Bogor...

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Sustainable Urban Water International Seminar 2019, SUWIS 2019

作者： Nugraheni, Claudia Tyas Pawitan, Hidayat Purwanto, Yanuar Jarwadi Ridwansyah, Iwan Postgraduate Program in Natural Resources and Environmental Management IPB Bogor Indonesia Department of Geophysics and Meteorology IPB Bogor Indonesia Department of Civil and Environmental Engineering IPB Bogor Indonesia Limnology Research Center LIPI Bogor Indonesia

Bogor Regency is one of Regencies in Jabodetabek area that is experiencing rapid urban growth. This condition impacted the decreasing conditions of 39's from 95's urban small lakes or locally known as 'situ'. This research aims to analyze the effectiveness of situ Kebantenan and situ Cikaret as Ciliwung flood mitigation measure in the Bogor Regency. The SWAT model was employed for quantification the water balance of situ and watershed management. The simulation results of the water balance analysis indicated that the monthly average of volume of Situ Kabantenan and Situ Cikaret (2008-2015) were 136,955 m3 and 508,907 m3, the annual inflow Situ Cikaret were 24,693,822 m3/year and outflow were 25,177,593 m3/year, precipitation were 648,520 m3/year, evaporation were 166,543 m3/year, delta storage (1,794) m3/year, respectively. The result of hydrological responses analysis on application of situ and watershed management scenarios that combined the structural and non-structural measures was the best scenario for decreasing maximum discharge at situ outlet which is decreased 41% discharge. So that, in order to enhance the effectiveness of situs for Ciliwung flood mitigation, the combination of the structural and non structural management of 13 situ's in Ciliwung river basin within the Bogor Regency is recommended that can increase the storage capacity from 1.8 million m3 to 4.7 million m3. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Urban growth

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Application of factor analysis method to support the users acceptance model of ERP systems implementation 4

Application of factor analysis method to support the users a...

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4th International Conference on Combinatorics, Graph Theory, and Network Topology, ICCGANT 2020

作者： Sardjono, W. Sudirwan, J. Priatna, W. Putra, G.R. Information Systems Management Department BINUS Graduate Program Master of Information Systems Management Bina Nusantara University Jakarta11480 Indonesia School of Information Systems Department BINUS Undergraduate Program Bina Nusantara University Jakarta11480 Indonesia Informatics Engineering Engineering Bhayangkara University Jakarta Raya Indonesia Computer Science Study Program Faculty of Mathematics and Natural Sciences Pakuan University Bogor Indonesia

An e-Commerce company has been using an Enterprise Resource Planning (ERP) system for several years, but is still constrained in its implementation, this is reflected in the number of issue/change request tickets submitted by users who have not been able to reach ideal conditions. To overcome this problem, we need an appropriate reference model, the ERP system user acceptance model in companies. The study conducted factors that influence the level of acceptance of SAP ERP users in the XYZ group to then determine a model that is able to explain practically the level of ERP system user acceptance, which in turn can produce concrete proposals to increase ERP system user acceptance. Research is quantitative descriptive using factor analysis and regression analysis methods. The research method uses a questionnaire with a total of 107 valid respondents coming from 8 company names under the XYZ group in 6 Southeast Asian countries. The conclusion of the study is that there are 24 indicators and 4 factors that influence user acceptance of the SAP ERP system. These four factors are the low contribution of the ERP system, the quality of ERP systems and data, the development of ERP systems, and also the low quality of ERP system supporters. It is hoped that by optimizing the value of the 4 factors, the XYZ group can increase user acceptance of the SAP ERP system so that the system can provide benefits expected by the company to be competitive advantage. © 2021 Published under licence by IOP Publishing Ltd.

关键词： Factor analysis

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Documenting Twenty Years of the Contracted Labor-Intensive Forestry Workforce on National Forest System Lands in the United States (Jun, fvad026, 2023)

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JOURNAL OF FORESTRY 2023年第5-6期122卷 506-506页

作者： Deak, Alison Huber-Stearns, Heidi Crandall, Mindy Poudel, Kamana Davis, Emily Jane Coughlan, Michael R. Wilmsen, Carl University of California Cooperative Extension Mariposa CA USA Ecosystem Workforce Program Institute for Resilient Organizations Communities and Environments University of Oregon Eugene OR USA School for Environment and Sustainability University of Michigan Ann Arbor MI USA Department of Forest Engineering Resources and Management Oregon State University Corvallis OR USA Forestry and Natural Resources Extension and Department of Forest Ecosystems and Society Oregon State University Corvallis OR USA Northwest Forest Worker Center Ashland OR USA

This paper presents the first nationwide analysis detailing the scope and scale of labor-intensive forestry contracts performed on National Forest System lands and examines the businesses contracted, location and types of work performed, and distance traveled by businesses between 2001 and 2020. During the study period, 61,698 contracts were awarded to 7,896 businesses, totaling $12.9 billion, to perform labor-intensive forestry work, with most work being contracted for wildfire-related activities. Businesses were typically located in western states and non-minority owned businesses received the majority of contracts. Of minority-owned businesses, Hispanic American–owned businesses received the most contracts. The median distance that businesses traveled to accomplish work increased significantly through time but differed by business type. Understanding the scope and work of businesses awarded contracts provides insight into the workforce and its relationship to marginalized populations. Strategic investment in this workforce may have widespread impacts on federal, state, and local economies and the livelihoods of forest *** Implications: Between 2001–2020, the USDA Forest Service spent billions of dollars on contracts with thousands of businesses to conduct labor-intensive forestry projects; however, project locations and awarded businesses were not evenly distributed through space and time. Emerging and minority businesses represented a small proportion of contracts awarded. Advancing understanding of the businesses conducting labor-intensive forestry work lays the foundation for inquiry into the working conditions forest workers experience as well as disparities in contract capture. Some regions may have benefitted more from contract capture than others. Understanding factors enabling places and businesses to capture these contract dollars may help identify others that may benefit from investment.

关键词： USDA Forest Service labor-intensive forestry national forest system federal contracting federal procurement data system product service codes restoration business

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Erratum to: Carbon and Nitrogen Decoupling Under an 11-Year Drought in the Shortgrass Steppe

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Ecosystems 2013年第4期16卷 704-705页

作者： Sarah E. Evans Ingrid C. Burke Graduate Degree Program in Ecology and Natural Resource Ecology Laboratory Colorado State University Fort Collins USA Environment and Natural Resources Program Department of Botany Department of Ecosystem Science and Management University of Wyoming Laramie USA

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Predation on Atlantic Salmon Smolts by Striped Bass after Dam Passage

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North American Journal of Fisheries management 2011年第4期18卷 936-939页

作者： Bradley F. Blackwell Francis Juanes Department of Forestry and Wildlife Management Holdsworth Natural Resources Center University of Massachusetts Amherst Massachusetts 01003 USA Department of Forestry and Wildlife Management Holdsworth Natural Resources Center and Graduate Program in Organismic and Evolutionary Biology University of Massachusetts Amherst Massachusetts 01003 USA

We documented predation on smolts of Atlantic salmon Salmo salar by striped bass Morone saxatilis foraging in the tailrace of the Essex Dam on the Merrimack River, Lawrence, Massachusetts, and assessed factors that may affect smolt susceptibility to predation. During 6 d of diurnal angling from 6 to 28 May, we captured 212 striped bass, 41 of which contained prey remains. More than 48% of striped bass that contained prey had consumed smolts. Atlantic salmon smolts composed more than 80% of the total mass of prey remains recovered and included both individuals of stocked-fry and stocked-smolt origin. Based on information from this pilot study, a focused investigation of striped bass predation on smolts after passage of the Essex Dam began in 1998.

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Groundwater quality assessment using few-shot learning with prototypical, Siamese, and matching networks

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Journal of Water Process engineering 2025年 75卷

作者： Abdessamed Derdour Mohammed Baz Ali Alzaed Amanuel Kumsa Bojer Sherif S.M. Ghoneim Artificial Intelligence Laboratory for Mechanical and Civil Structures and Soil University Center of Naama P.O. Box 66 Naama 45000 Algeria Laboratory for the Sustainable Management of Natural Resources in Arid and Semi-Arid Zones University Center of Naama 45000 Naama Algeria Department of Computer Engineering College of Computers and Information Technology Taif University Taif 21944 Saudi Arabia Architectural Engineering Program - Civil Engineering Department Faculty of Engineering Taif University Taif 21944 Saudi Arabia Ethiopian Artificial Intelligence Institute PO Box 40782 Addis Ababa Ethiopia Department of Electrical Engineering College of Engineering Taif University Taif 21944 Saudi Arabia

Groundwater quality assessment is critical for sustainable water resource management, especially in hyperarid regions like Adrar, Algeria, where data scarcity and environmental challenges hinder traditional monitoring methods. This study explores the application of three Few-Shot Learning (FSL) algorithms: Prototypical Networks, Siamese Networks, and Matching Networks, for groundwater quality classification using limited datasets. The dataset comprises 166 groundwater samples from the Adrar region, characterized by five quality classes: “Excellent,” “Very Good,” “Good,” “Satisfactory,” and “Unsatisfactory.” Results demonstrate that Prototypical Networks outperform other FSL algorithms, achieving 93 % accuracy with 10 support samples per class, while Siamese and Matching Networks achieve 90 % and 88 % accuracy, respectively. The study highlights the potential of FSL in addressing data scarcity, offering a cost-effective and efficient approach for groundwater quality assessment in data-scarce regions. The findings underscore the importance of FSL in complementing traditional methods, particularly in hyper arid areas where data collection is challenging.

关键词： Water resource management Data scarcity Classification algorithms Hyperarid regions Accuracy evaluation

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Flood modeling in the Ba River basin using a coupled hydrodynamic model—MIKE FLOOD

River

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River 2024年第2期3卷 199-207页

作者： Luc Anh Tuan Can Thu Van Doan Van Binh Sameh AKantoush Tetsuya Sumi Le Van Quyen Ta Thi Huong Master Program in Water Technology Reuse&Management(with TU DarmstadtGermany)Faculty of EngineeringVietnamese–German UniversityBen Cat TownVietnam Ho Chi Minh City University of Natural Resources and Environment Ho Chi Minh CityVietnam Water Resources Research Center Disaster Prevention Research InstituteKyoto UniversityKyotoJapan VNU School of Interdisciplinary Study and Arts Cau GiayVietnam

The problem of flooding in Central Vietnam in general and the lower Ba River in particular is one of the natural disasters that frequently threatens people's lives and socioeconomic development in the ***,climate change is becoming ever more prominent and hotter,making extreme natural disasters more unusual and *** this research,MIKE-FLOOD—a model that connects a 1-dimensional(1-D)MIKE 11 Hydrodynamics(HD)model with a 2-dimensional(2-D)MIKE 21 HD model—was used to set *** model was calculated for three floods:(1)flood in October 1993,(2)flood in November 2003,and(3)flood in November 2007;these are floods with high frequency and relatively large *** results show that the 1993 flood rose and receded *** flood peak inundated an area of 22,600 ha,accounting for 52%of the natural *** flooded areas deeper than 1,2,3,4,and 5m were 16500,11,000,7000,4200,and 2200 ha,*** the center of Tuy Hoa city,the flooded area at the time of maximum water level was almost 100%.

关键词： Ba River basin coupled hydrodynamic model flooding MikeFlood model

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