809 research outputs found
Data for: Material mechanical properties necessary for structural intervention of concrete structures
No full textStructural intervention is to restore and/or upgrade mechanical performances of structures. There are many methods for structural intervention for concrete structures, whose structural materials and structural details are often different from those in existing structures to be intervened. Not only concrete and steel, which are typical materials for concrete structures, but also fiber reinforced polymers (FRP), cementitious materials with fibers and polymers and adhesives are often applied for structural intervention. There are various fibers and polymers used for interventions. The prediction method for structural performance of concrete structures are based on mechanical properties of concrete and steel. Stress-strain relationship of steel is unique in comparison with other materials, which is characterized with the yielding point and high fracturing strain. In order to predict structural performance, therefore, we need to develop generic method applicable to not only steel but also other materials. The generic model can tell us what would be the mechanical property to make the structural performance better. External bonding, which is a typical scheme for structural intervention, is not for new structures. Therefore, it is necessary to clarify the material properties and structural details to achieve better bonding strength at interface between substrate concrete and externally bonded material.This paper presents the mechanical property of substrate concrete and intervention material; (1) to achieve better shear strength and ultimate deformation of member after structural intervention, and (2) to achieve better debonding strength for external bonding. Some of the mechanical properties and structural details necessary for better structural performance for structures with structural intervention are different and new from those for structures without intervention. For example, high strength and stiffness are properties for materials in structures without structural intervention, while high fracturing strain and low stiffness are properties for structural intervention materials
A successful model of regional healthcare information exchange in Japan: Case Study in Kagawa Prefecture
No full textIn this study, we focused on analysis of healthcare data exchange over the network. For the advance of broadband capability development, many governments expect online medical information exchange between medical institutions. Japanese government also has tried to deploy ICT in the healthcare field. In Japan, many healthcare ICT projects started, but almost of all the projects face many issues and failed to continue. This situation caused us to clarify the success factor of healthcare information exchange network. For inspecting the success factors, we analyzed information access of healthcare systems in Kagawa prefecture of Japan. Kagawa prefecture is one of the most advance areas for healthcare information technology. We analyzed four medical ICT projects in Kagawa prefecture: K-MIX, Critical Pathway for Diabetes, E-prescription, and PHR. In addition, we inspected characteristics of exchanged data in the network, and stakeholder involved in these projects. This analysis lets us find various types of healthcare ICT projects. Characteristic of data processed in the projects caused differences of characteristic of the projects. On the other hand, multiple systems process same data, though the project does not share the data itself. Considering various types of medical information exchanges projects, we propose classification and standard format of exchanged data according to their characteristic are critical for efficient business deployment. --e-Health,regional healthcare information exchange,EHR
Handwrtitten notes for lease agreement between Dominguez Estate Company and Shigeru Ueda, approximately 1938
No full textSigeru Ueda written as "Bob Ueda."Handwritten notes with description of a lease agreement including eight different plots of land and cost of yearly rent. Shorthand notes are also included at the end of the document. See Item csudh_rsp_0072 for an executed lease agreement describing the same acreage
Mesoscale Modeling of Chloride Penetration in Unsaturated Concrete Damaged by Freeze-Thaw Cycling
No full textFor concrete structures exposed to frost attack, cracks, or microcracks induced by freeze-thaw cycling can format interconnecting flow paths and allow more water or chloride ions to penetrate into the bulk concrete. It will subsequently facilitate further deterioration of concrete structures and accelerate the corrosion of embedded reinforced steel bars. Moreover, in reality most concrete structures are rarely fully saturated, so that chloride transportation in unsaturated concrete must be studied with respect to the water moving process in order to cover the real existing service conditions. In the current work, a numerical simulation method based on the mesoscale composite structure of concrete, named the lattice network model, is established to analyze the penetration property of concrete; especially the effects of microcracking induced by freeze-thaw damage on the unsaturated flow behavior are investigated. In the mesoscale model, concrete is treated as a three-phase composite material consisting of coarse aggregates, mortar matrix, and interfacial transition zone (ITZ) between the aggregate and the mortar matrix. The diffusivities of each phase, (i.e.,water and chloride diffusion coefficients) is separately characterized and quantified in terms of the published test results. The unsaturated flow theory for capillary water absorption and chloride transport is employed to simulate the ingress of water and chloride ions into concrete. It is found that the water absorption and chloride penetration are substantially influenced by the frost action, and the cumulative absorbed water and chloride penetration depth are increased with the increase of freezing-thawing cycles (FTCs). Furthermore, the numerical predictions about water absorption and chloride profiles are compared with the experimental measurements. The comparisons indicate that numerical predictions agree very well with the test data
In-Plane Shear Performance of Masonry Walls after Strengthening by Two Different FRPs
No full textThis experimental study was aimed to investigate the in-plane shear performance of externally strengthened masonry walls using two types of fiber-reinforced polymer (FRP) sheets, namely, carbon FRP (CFRP) and polyethylene terephthalate-FRP (PET-FRP) sheets. Among these two, PET-FRP has a low tensile strength but possess a higher fracturing strain than CFRP. Twelve masonry walls made from clay brick were tested for static lateral loading under constant compression, after bonding CFRP and PET-FRP sheets onto their surfaces in three different configurations. The ultimate shear strength and deformation at peak load were the two important observations. The mechanisms by which load was carried were observed, varying from the initial uncracked state to the final, fully cracked state. The results demonstrate that a significant increase in the in-plane shear capacity of masonry can be achieved by bonding these two FRPs to the surface of the walls but ductility is compromised when CFRP is used. Walls retrofitting with PET-FRP in a crossdiagonal fashion show a good ductile behavior in both prepeak and postpeak regimes. The experimental data were used to assess the effectiveness of the strengthening of one FRP over the other. PET-FRP in diagonal configuration was found to be the most effective way of strengthening without compromising the two most essential aspects of masonry, that is, strength and ductility
Letter from Dominguez Estate Company to Mr. Robert S. [Shigeru] Ueda, June 7, 1940
No full textLetter is one of several attempts to acquire from Ueda a lease agreement with his signature for the current year
Land lease statement from Dominguez Estate Company to Robert S. [Shigeru] Ueda
No full textStatement reflects balances due for both 1938 and 1939 leases. An additional note sternly insists Ueda make an immediate payment
Letter from Dominguez Estate Company to Mr. Robert S. [Shigeru] Ueda, May 9, 1939
No full textLetter asks Ueda to sign and return two copies of a lease agreement that was recently sent
Letter from Dominguez Estate Company to Mr. Robert Shigeru Ueda, June 8, 1938
No full textLetter asks Ueda to return his rental receipt book with his upcoming payment to cancel charges for an 18 acre lease previously occupied b Mr. Goto
Letter from [John Victor Carson], Dominguez Estate Company to Mr. Robert S. [Shigeru] Ueda, January 6, 1938
No full textLetter requests Ueda sign a second copy of a land lease agreement, the first copy was enclosed in the sent letter as an executed document for his records
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