362 research outputs found
UA30/1/1 State Normal Farm Near Bowling Green, Kentucky
Map by surveyor H.M. Yarbrough showing location of 81 acres of WKU Farm. Scale is 1 inch = 15 poles, northwest orientation, 22 x 10 . Includes location of Jonesville. The map is undated, 1930 is a circa date
Cyclical construction workforce shortage : an evaluation of the current shortage in Western North Carolina
The inadequate supply of skilled construction craft workers is an issue that currently affects the performance of the construction industry. The performance of the construction industry has a significant influence on the growth of the national economy as well as citizens’ wellbeing. The challenges associated with the construction industry’s skilled worker shortage are cyclical. The cyclical nature is a result of the fact that the demand for construction in the U.S. depends on the performance of the overall U.S. economy. The current study evaluates the nature of the current shortage in the western region of North Carolina. Accordingly, the study examines the data collected by the Mountain Area Workforce Development Board, employing a survey that targeted construction firms. The authors have analyzed 46 completed surveys that were collected during the fall of 2018. Among other findings, the study reveals that the demand for laborers and licensed journeymen is higher than other construction positions such as supervisors and estimators. Also, the study shows that entry-level positions such as laborers have higher employee turnover rates compared to more experienced positions. The research could help develop a certified career pathway that provides short-term training and work-based learning opportunities for the raw construction workforce
Data Predictive Control for Peak Power Reduction
Decisions on how best to optimize today\u27s energy systems operations are becoming ever so complex and conflicting such that model-based predictive control algorithms must play a key role. However, learning dynamical models of energy consuming systems such as buildings, using grey/white box approaches is very cost and time prohibitive due to its complexity. This paper presents data-driven methods for making control-oriented model for peak power reduction in buildings. Specifically, a data predictive control with regression trees (DPCRT) algorithm, is presented. DPCRT is a finite receding horizon method, using which the building operator can optimally trade off peak power reduction against thermal comfort without having to learn white/grey box models of the systems dynamics. We evaluate the performance of our method using a DoE commercial reference virtual test-bed and show how it can be used for learning predictive models with 90% accuracy, and for achieving 8.6% reduction in peak power and costs
Adoption of BIM by architectural firms in India: technology–organization–environment perspective
Building information modelling (BIM) is being heralded as a remarkable innovation in the built environment sector with expectations of lofty sector-wide improvements. Some countries have shown remarkable levels of uptake of BIM, along the way documenting some evidence of benefits stemming from BIM. However, countries such as India and China are late entrants in the BIM adoption journey and are seeing a slower adoption rate. This study develops a model using the technology–organization–environment framework to study the factors influencing BIM adoption by architectural firms in India and reasons for this slow adoption. The proposed model of BIM adoption is tested using the partial least square method against responses collected from 184 industry professionals based in India. Findings reveal that the adoption of BIM by Indian architectural firms is at the ‘experimentation’ stage with variables such as expertise, trialability, and management support exhibiting a strong positive influence on BIM adoption. The study also explains the status of BIM adoption in India with the help of a multi-level social construct, which places the level of BIM adoption in India between the micro- and meso-levels of organizational scales. Similarities and dissimilarities with previous findings are discussed in the paper to highlight the findings of this study. © 2016 Informa UK Limited, trading as Taylor & Francis Grou
Design management: changing roles of the professions
This paper sets out to explore how recent changes in
procurement in construction have affected the roles that
professions play in the design process. It discusses how
professions that traditionally took the role of design
manager now find themselves participating within
previously unforeseen contexts, working in multidisciplinary
teams led by contractors and with changed
responsibilities at the design stage. Supply chain members
who were not previously involved during the early project
phases are being engaged at the earliest phases of the
project life cycle and even taking leadership roles while
designers sometimes work as supply chain partners.
A study of design in construction and other sectors shows
that in dealing with design management issues it is critical
to deepen appreciation for the unique characteristics of
design and the design process. The paper argues that
contractors and designers taking on design management
roles in a dynamic industry seeking to explore best
practice and innovative approaches to procurement and in
the delivery of projects need to acquire new skills,
management education and develop the necessary
qualities
Inclined reinforcement around web opening in concrete beams
YesTwelve reinforced-concrete continuous deep beams
having web openings within interior shear spans were
tested to failure. The main variables investigated were
the opening size and the amount of inclined
reinforcement around openings. An effective inclined
reinforcement factor combining the influence of the
amount of inclined web reinforcement and opening size
is proposed and used to analyse the structural behaviour
of continuous deep beams tested. It was observed that
the end support reaction, diagonal crack width and load
capacity of beams tested were significantly dependent on
the proposed effective inclined reinforcement factor. As
this factor increased, the end support reaction and
increasing rate of diagonal crack width were closer to
those of companion solid deep beams. In addition, a
higher load capacity was exhibited by beams having an
effective inclined reinforcement factor above 0.077 than
the companion solid deep beam. A numerical procedure
based on the upper-bound analysis of the plasticity
theory was proposed to estimate the load capacity of
beams tested. Comparisons between the measured and
predicted load capacities showed good agreement
Neural network modelling of RC deep beam shear strength
YesA 9 x 18 x 1 feed-forward neural network (NN) model
trained using a resilient back-propagation algorithm and
early stopping technique is constructed to predict the
shear strength of deep reinforced concrete beams. The
input layer covering geometrical and material properties
of deep beams has nine neurons, and the corresponding output is the shear strength. Training, validation and testing of the developed neural network have been
achieved using a comprehensive database compiled from
362 simple and 71 continuous deep beam specimens.
The shear strength predictions of deep beams obtained
from the developed NN are in better agreement with
test results than those determined from strut-and-tie
models. The mean and standard deviation of the ratio between predicted capacities using the NN and measured shear capacities are 1.028 and 0.154, respectively, for simple deep beams, and 1.0 and 0.122, respectively, for continuous deep beams. In addition, the
trends ascertained from parametric study using the developed NN have a consistent agreement with those observed in other experimental and analytical investigations
Structural Behaviour of Reinforced Concrete Continuous Deep Beams with Web Openings.
yesTen reinforced-concrete continuous deep beams with openings were tested to failure. The main variables investigated were the shear span-to-overall depth ratio, and the size and location of openings. Two failure modes influenced by the size and location of web openings regardless of the shear span-to-overall depth ratio were observed. The normalised load capacity of beams having a web opening area ratio of 0·025 within exterior shear spans was approximately similar to that of their companion solid beams. Continuous deep beams having web openings within interior shear spans exhibited a higher load capacity reduction with the increase of the opening size, similar to simply supported deep beams with web openings. Formulae based on the upper bound analysis of the plasticity theory were proposed to predict the load capacity of continuous deep beams with web openings. Comparisons between the measured and predicted load capacities showed a good agreement
Indoor school environments, physical activity, sitting behaviour and pedagogy: a scoping review
Physical activity levels in children are low and sitting time high, despite the health benefits of regular physical activity and limited sitting. Children spend a large proportion of their time at school, hence school-based interventions targeting physical activity and sitting behaviour may be important. Whilst some aspects of school buildings, their layout and furniture may influence children's physical activity and sitting, these effects could be intertwined with pedagogical approaches. This scoping review aims to identify gaps in the research literature regarding the influence of the indoor school environment on pedagogical approaches and on physical activity and sitting. In primary schools, it was found that physical activity can be integrated into lessons with some benefits on academic behaviour and possibly academic performance. Overall, however, the role of the indoor built environment is poorly investigated, although a handful of studies suggest that a radical change in primary school classrooms may increase physical activity and that stand-biased desks may be promising. This study provides a contribution to the emerging research fields of ‘active design’ from the perspective of indoor school design, highlighting a dearth of research, especially on sitting and for secondary education, and a lack of relevant conceptual frameworks
New forming method of manufacturing cylindrical parts with nano/ultrafine grained structures by power spinning based on small plastic strains
A new spinning method to manufacture the cylindrical parts with nano/ultrafine grained structures is proposed, which consists of quenching, power spinning and recrystallization annealing. The microstructural evolution during the different process stages and macroforming quality of the spun parts made of ASTM 1020 steel are investigated. The results show that the microstructures of the ferrites and pearlites in the ASTM 1020 steel are transformed to the lath martensites after quenching. The martensite laths obtained by quenching are refined to 87 nm and a small amount of nanoscale deformation twins with an average thickness of 20 nm is generated after performing a 3-pass stagger spinning with 55% thinning ratio of wall thickness, where the equivalent strain required is only 0.92. The equiaxial ferritic grains with an average size of 160 nm and nano-carbides are generated by subsequent recrystallization annealing at 480°C for 30 min. The spun parts with high dimensional precision and low surface roughness are obtained by the forming method developed in this work, combining quenching with 3-pass stagger spinning and recrystallization annealing
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